Merge branch 'master' of git://git.denx.de/u-boot-mips

arch/mips/Kconfig

@@ -23,6 +23,7 @@ config TARGET_QEMU_MIPS
 
 config TARGET_MALTA
 	bool "Support malta"
+	select DYNAMIC_IO_PORT_BASE
 	select SUPPORTS_BIG_ENDIAN
 	select SUPPORTS_LITTLE_ENDIAN
 	select SUPPORTS_CPU_MIPS32_R1
@@ -54,6 +55,11 @@ config TARGET_PB1X00
 	select SYS_MIPS_CACHE_INIT_RAM_LOAD
 	select MIPS_TUNE_4KC
 
+config MACH_PIC32
+	bool "Support Microchip PIC32"
+	select OF_CONTROL
+	select DM
+
 endchoice
 
 source "board/dbau1x00/Kconfig"
@@ -61,6 +67,7 @@ source "board/imgtec/malta/Kconfig"
 source "board/micronas/vct/Kconfig"
 source "board/pb1x00/Kconfig"
 source "board/qemu-mips/Kconfig"
+source "arch/mips/mach-pic32/Kconfig"
 
 if MIPS
 
@@ -217,6 +224,9 @@ config MIPS_L1_CACHE_SHIFT
 	default "4" if MIPS_L1_CACHE_SHIFT_4
 	default "5"
 
+config DYNAMIC_IO_PORT_BASE
+	bool
+
 endif
 
 endmenu

arch/mips/Makefile

@@ -8,6 +8,7 @@ libs-y += arch/mips/cpu/
 libs-y += arch/mips/lib/
 
 machine-$(CONFIG_SOC_AU1X00) += au1x00
+machine-$(CONFIG_MACH_PIC32) += pic32
 
 machdirs := $(patsubst %,arch/mips/mach-%/,$(machine-y))
 libs-y += $(machdirs)

arch/mips/cpu/start.S

@@ -115,7 +115,7 @@ reset:
 
 	/* Clear watch registers */
 	MTC0	zero, CP0_WATCHLO
-	MTC0	zero, CP0_WATCHHI
+	mtc0	zero, CP0_WATCHHI
 
 	/* WP(Watch Pending), SW0/1 should be cleared */
 	mtc0	zero, CP0_CAUSE
@@ -161,14 +161,14 @@ reset:
 #endif
 
 	/* Set up temporary stack */
-	PTR_LI	t0, -16
+	li	t0, -16
 	PTR_LI	t1, CONFIG_SYS_INIT_SP_ADDR
 	and	sp, t1, t0		# force 16 byte alignment
 	PTR_SUB	sp, sp, GD_SIZE		# reserve space for gd
 	and	sp, sp, t0		# force 16 byte alignment
 	move	k0, sp			# save gd pointer
 #ifdef CONFIG_SYS_MALLOC_F_LEN
-	PTR_LI	t2, CONFIG_SYS_MALLOC_F_LEN
+	li	t2, CONFIG_SYS_MALLOC_F_LEN
 	PTR_SUB	sp, sp, t2		# reserve space for early malloc
 	and	sp, sp, t0		# force 16 byte alignment
 #endif
@@ -177,15 +177,15 @@ reset:
 	/* Clear gd */
 	move	t0, k0
 1:
-	sw	zero, 0(t0)
+	PTR_S	zero, 0(t0)
 	blt	t0, t1, 1b
-	 PTR_ADDI t0, 4
+	 PTR_ADDI t0, PTRSIZE
 
 #ifdef CONFIG_SYS_MALLOC_F_LEN
-	PTR_ADDU t0, k0, GD_MALLOC_BASE	# gd->malloc_base offset
-	sw	sp, 0(t0)
+	PTR_S	sp, GD_MALLOC_BASE(k0)	# gd->malloc_base offset
 #endif
 
+	move	a0, zero		# a0 <-- boot_flags = 0
 	PTR_LA	t9, board_init_f
 	jr	t9
 	 move	ra, zero
@@ -224,11 +224,11 @@ ENTRY(relocate_code)
 	 * t2 = source end address
 	 */
 1:
-	lw	t3, 0(t0)
-	sw	t3, 0(t1)
-	PTR_ADDU t0, 4
+	PTR_L	t3, 0(t0)
+	PTR_S	t3, 0(t1)
+	PTR_ADDU t0, PTRSIZE
 	blt	t0, t2, 1b
-	 PTR_ADDU t1, 4
+	 PTR_ADDU t1, PTRSIZE
 
 	/* If caches were enabled, we would have to flush them here. */
 	PTR_SUB	a1, t1, s2		# a1 <-- size

arch/mips/dts/Makefile

@@ -2,7 +2,7 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-dtb-y +=
+dtb-$(CONFIG_TARGET_PIC32MZDASK) += pic32mzda_sk.dtb
 
 targets += $(dtb-y)
 

arch/mips/dts/pic32mzda.dtsi

@@ -0,0 +1,174 @@
+/*
+ * Copyright 2015 Microchip Technology, Inc.
+ * Purna Chandra Mandal, <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/clock/microchip,clock.h>
+#include <dt-bindings/gpio/gpio.h>
+#include "skeleton.dtsi"
+
+/ {
+	compatible = "microchip,pic32mzda", "microchip,pic32mz";
+
+	aliases {
+		gpio0 = &gpioA;
+		gpio1 = &gpioB;
+		gpio2 = &gpioC;
+		gpio3 = &gpioD;
+		gpio4 = &gpioE;
+		gpio5 = &gpioF;
+		gpio6 = &gpioG;
+		gpio7 = &gpioH;
+		gpio8 = &gpioJ;
+		gpio9 = &gpioK;
+	};
+
+	cpus {
+		cpu@0 {
+			compatible = "mips,mips14kc";
+		};
+	};
+
+	clock: clk@1f801200 {
+		compatible = "microchip,pic32mzda-clk";
+		reg = <0x1f801200 0x1000>;
+		#clock-cells = <1>;
+	};
+
+	uart1: serial@1f822000 {
+		compatible = "microchip,pic32mzda-uart";
+		reg = <0x1f822000 0x50>;
+		interrupts = <112 IRQ_TYPE_LEVEL_HIGH>;
+		status = "disabled";
+		clocks = <&clock PB2CLK>;
+	};
+
+	uart2: serial@1f822200 {
+		compatible = "microchip,pic32mzda-uart";
+		reg = <0x1f822200 0x50>;
+		interrupts = <145 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&clock PB2CLK>;
+		status = "disabled";
+	};
+
+	uart6: serial@1f822a00 {
+		compatible = "microchip,pic32mzda-uart";
+		reg = <0x1f822a00 0x50>;
+		interrupts = <188 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&clock PB2CLK>;
+		status = "disabled";
+	};
+
+	evic: interrupt-controller@1f810000 {
+		compatible = "microchip,pic32mzda-evic";
+		interrupt-controller;
+		#interrupt-cells = <2>;
+		reg = <0x1f810000 0x1000>;
+	};
+
+	pinctrl: pinctrl@1f801400 {
+		compatible = "microchip,pic32mzda-pinctrl";
+		reg = <0x1f801400 0x100>, /* in  */
+		      <0x1f801500 0x200>, /* out */
+		      <0x1f860000 0xa00>; /* port */
+		reg-names = "ppsin","ppsout","port";
+		status = "disabled";
+
+		ranges = <0 0x1f860000 0xa00>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		gpioA: gpio0@0 {
+			compatible = "microchip,pic32mzda-gpio";
+			reg = <0x000 0x48>;
+			gpio-controller;
+			#gpio-cells = <2>;
+		};
+
+		gpioB: gpio1@100 {
+			compatible = "microchip,pic32mzda-gpio";
+			reg = <0x100 0x48>;
+			gpio-controller;
+			#gpio-cells = <2>;
+		};
+
+		gpioC: gpio2@200 {
+			compatible = "microchip,pic32mzda-gpio";
+			reg = <0x200 0x48>;
+			gpio-controller;
+			#gpio-cells = <2>;
+		};
+
+		gpioD: gpio3@300 {
+			compatible = "microchip,pic32mzda-gpio";
+			reg = <0x300 0x48>;
+			gpio-controller;
+			#gpio-cells = <2>;
+		};
+
+		gpioE: gpio4@400 {
+			compatible = "microchip,pic32mzda-gpio";
+			reg = <0x400 0x48>;
+			gpio-controller;
+			#gpio-cells = <2>;
+		};
+
+		gpioF: gpio5@500 {
+			compatible = "microchip,pic32mzda-gpio";
+			reg = <0x500 0x48>;
+			gpio-controller;
+			#gpio-cells = <2>;
+		};
+
+		gpioG: gpio6@600 {
+			compatible = "microchip,pic32mzda-gpio";
+			reg = <0x600 0x48>;
+			gpio-controller;
+			#gpio-cells = <2>;
+		};
+
+		gpioH: gpio7@700 {
+			compatible = "microchip,pic32mzda-gpio";
+			reg = <0x700 0x48>;
+			gpio-controller;
+			#gpio-cells = <2>;
+		};
+
+		gpioJ: gpio8@800 {
+			compatible = "microchip,pic32mzda-gpio";
+			reg = <0x800 0x48>;
+			gpio-controller;
+			#gpio-cells = <2>;
+		};
+
+		gpioK: gpio9@900 {
+			compatible = "microchip,pic32mzda-gpio";
+			reg = <0x900 0x48>;
+			gpio-controller;
+			#gpio-cells = <2>;
+		};
+	};
+
+	sdhci: sdhci@1f8ec000 {
+		compatible = "microchip,pic32mzda-sdhci";
+		reg = <0x1f8ec000 0x100>;
+		interrupts = <191 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&clock REF4CLK>, <&clock PB5CLK>;
+		clock-names = "base_clk", "sys_clk";
+		clock-freq-min-max = <25000000>,<25000000>;
+		bus-width = <4>;
+		status = "disabled";
+	};
+
+	ethernet: ethernet@1f882000 {
+		compatible = "microchip,pic32mzda-eth";
+		reg = <0x1f882000 0x1000>;
+		interrupts = <153 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&clock PB5CLK>;
+		status = "disabled";
+		#address-cells = <1>;
+		#size-cells = <0>;
+	};
+};

arch/mips/dts/pic32mzda_sk.dts

@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2015 Purna Chandra Mandal, purna.mandal@microchip.com
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/dts-v1/;
+
+#include "pic32mzda.dtsi"
+
+/ {
+	model = "Microchip PIC32MZDASK";
+	compatible = "microchip,pic32mzdask", "microchip,pic32mzda";
+
+	aliases {
+		console = &uart2;
+		serial0 = &uart2;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+};
+
+&clock {
+	microchip,refo2-frequency = <50000000>;
+	microchip,refo4-frequency = <25000000>;
+	microchip,refo5-frequency = <40000000>;
+	status = "okay";
+	u-boot,dm-pre-reloc;
+};
+
+&pinctrl {
+	status = "okay";
+	u-boot,dm-pre-reloc;
+};
+
+&uart2 {
+	status = "okay";
+	u-boot,dm-pre-reloc;
+};
+
+&sdhci {
+	status = "okay";
+};
+
+&ethernet {
+	reset-gpios = <&gpioJ 15 0>;
+	status = "okay";
+	phy-mode = "rmii";
+	phy-handle = <&ethernet_phy>;
+	ethernet_phy: lan8740_phy@0 {
+		reg = <0>;
+	};
+};

arch/mips/include/asm/global_data.h

@@ -12,6 +12,9 @@
 
 /* Architecture-specific global data */
 struct arch_global_data {
+#ifdef CONFIG_DYNAMIC_IO_PORT_BASE
+	unsigned long io_port_base;
+#endif
 #ifdef CONFIG_JZSOC
 	/* There are other clocks in the jz4740 */
 	unsigned long per_clk;	/* Peripheral bus clock */

arch/mips/include/asm/io.h

@@ -25,11 +25,6 @@
 #include <mangle-port.h>
 #include <spaces.h>
 
-/*
- * Slowdown I/O port space accesses for antique hardware.
- */
-#undef CONF_SLOWDOWN_IO
-
 /*
  * Raw operations are never swapped in software.  OTOH values that raw
  * operations are working on may or may not have been swapped by the bus
@@ -46,57 +41,36 @@
 
 #define IO_SPACE_LIMIT 0xffff
 
-/*
- * On MIPS I/O ports are memory mapped, so we access them using normal
- * load/store instructions. mips_io_port_base is the virtual address to
- * which all ports are being mapped.  For sake of efficiency some code
- * assumes that this is an address that can be loaded with a single lui
- * instruction, so the lower 16 bits must be zero.  Should be true on
- * on any sane architecture; generic code does not use this assumption.
- */
-extern const unsigned long mips_io_port_base;
+#ifdef CONFIG_DYNAMIC_IO_PORT_BASE
+
+static inline ulong mips_io_port_base(void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	return gd->arch.io_port_base;
+}
 
-/*
- * Gcc will generate code to load the value of mips_io_port_base after each
- * function call which may be fairly wasteful in some cases.  So we don't
- * play quite by the book.  We tell gcc mips_io_port_base is a long variable
- * which solves the code generation issue.  Now we need to violate the
- * aliasing rules a little to make initialization possible and finally we
- * will need the barrier() to fight side effects of the aliasing chat.
- * This trickery will eventually collapse under gcc's optimizer.  Oh well.
- */
 static inline void set_io_port_base(unsigned long base)
 {
-	* (unsigned long *) &mips_io_port_base = base;
+	DECLARE_GLOBAL_DATA_PTR;
+
+	gd->arch.io_port_base = base;
 	barrier();
 }
 
-/*
- * Thanks to James van Artsdalen for a better timing-fix than
- * the two short jumps: using outb's to a nonexistent port seems
- * to guarantee better timings even on fast machines.
- *
- * On the other hand, I'd like to be sure of a non-existent port:
- * I feel a bit unsafe about using 0x80 (should be safe, though)
- *
- *		Linus
- *
- */
+#else /* !CONFIG_DYNAMIC_IO_PORT_BASE */
 
-#define __SLOW_DOWN_IO \
-	__asm__ __volatile__( \
-		"sb\t$0,0x80(%0)" \
-		: : "r" (mips_io_port_base));
+static inline ulong mips_io_port_base(void)
+{
+	return 0;
+}
 
-#ifdef CONF_SLOWDOWN_IO
-#ifdef REALLY_SLOW_IO
-#define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; }
-#else
-#define SLOW_DOWN_IO __SLOW_DOWN_IO
-#endif
-#else
-#define SLOW_DOWN_IO
-#endif
+static inline void set_io_port_base(unsigned long base)
+{
+	BUG_ON(base);
+}
+
+#endif /* !CONFIG_DYNAMIC_IO_PORT_BASE */
 
 /*
  *     virt_to_phys    -       map virtual addresses to physical
@@ -316,7 +290,7 @@ static inline type pfx##read##bwlq(const volatile void __iomem *mem)	\
 	return pfx##ioswab##bwlq(__mem, __val);				\
 }
 
-#define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, p, slow)			\
+#define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, p)			\
 									\
 static inline void pfx##out##bwlq##p(type val, unsigned long port)	\
 {									\
@@ -325,7 +299,7 @@ static inline void pfx##out##bwlq##p(type val, unsigned long port)	\
 									\
 	war_octeon_io_reorder_wmb();					\
 									\
-	__addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base + port); \
+	__addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base() + port); \
 									\
 	__val = pfx##ioswab##bwlq(__addr, val);				\
 									\
@@ -333,7 +307,6 @@ static inline void pfx##out##bwlq##p(type val, unsigned long port)	\
 	BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long));		\
 									\
 	*__addr = __val;						\
-	slow;								\
 }									\
 									\
 static inline type pfx##in##bwlq##p(unsigned long port)			\
@@ -341,12 +314,11 @@ static inline type pfx##in##bwlq##p(unsigned long port)			\
 	volatile type *__addr;						\
 	type __val;							\
 									\
-	__addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base + port); \
+	__addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base() + port); \
 									\
 	BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long));		\
 									\
 	__val = *__addr;						\
-	slow;								\
 									\
 	return pfx##ioswab##bwlq(__addr, __val);			\
 }
@@ -367,8 +339,8 @@ BUILDIO_MEM(l, u32)
 BUILDIO_MEM(q, u64)
 
 #define __BUILD_IOPORT_PFX(bus, bwlq, type)				\
-	__BUILD_IOPORT_SINGLE(bus, bwlq, type, ,)			\
-	__BUILD_IOPORT_SINGLE(bus, bwlq, type, _p, SLOW_DOWN_IO)
+	__BUILD_IOPORT_SINGLE(bus, bwlq, type, )			\
+	__BUILD_IOPORT_SINGLE(bus, bwlq, type, _p)
 
 #define BUILDIO_IOPORT(bwlq, type)					\
 	__BUILD_IOPORT_PFX(, bwlq, type)				\

arch/mips/lib/Makefile

@@ -7,7 +7,6 @@
 
 obj-y	+= cache.o
 obj-y	+= cache_init.o
-obj-y	+= io.o
 
 obj-$(CONFIG_CMD_BOOTM) += bootm.o
 

arch/mips/lib/cache.c

@@ -95,6 +95,10 @@ void flush_dcache_range(ulong start_addr, ulong stop)
 	const void *addr = (const void *)(start_addr & ~(lsize - 1));
 	const void *aend = (const void *)((stop - 1) & ~(lsize - 1));
 
+	/* aend will be miscalculated when size is zero, so we return here */
+	if (start_addr == stop)
+		return;
+
 	while (1) {
 		mips_cache(HIT_WRITEBACK_INV_D, addr);
 		if (addr == aend)
@@ -109,6 +113,10 @@ void invalidate_dcache_range(ulong start_addr, ulong stop)
 	const void *addr = (const void *)(start_addr & ~(lsize - 1));
 	const void *aend = (const void *)((stop - 1) & ~(lsize - 1));
 
+	/* aend will be miscalculated when size is zero, so we return here */
+	if (start_addr == stop)
+		return;
+
 	while (1) {
 		mips_cache(HIT_INVALIDATE_D, addr);
 		if (addr == aend)

arch/mips/lib/io.c

@@ -1,12 +0,0 @@
-/*
- * (C) Copyright 2003
- * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
- *
- * SPDX-License-Identifier:	GPL-2.0+
- */
-
-/*
- * mips_io_port_base is the begin of the address space to which x86 style
- * I/O ports are mapped.
- */
-const unsigned long mips_io_port_base = -1;

arch/mips/mach-pic32/Kconfig

@@ -0,0 +1,35 @@
+menu "Microchip PIC32 platforms"
+	depends on MACH_PIC32
+
+config SYS_SOC
+	default "pic32mzda" if SOC_PIC32MZDA
+
+choice
+	prompt "PIC32 SoC select"
+
+config SOC_PIC32MZDA
+	bool "Microchip PIC32MZ[DA] family"
+	select SUPPORTS_LITTLE_ENDIAN
+	select SUPPORTS_CPU_MIPS32_R1
+	select SUPPORTS_CPU_MIPS32_R2
+	select MIPS_L1_CACHE_SHIFT_4
+	select SYS_MIPS_CACHE_INIT_RAM_LOAD
+	help
+	  This supports Microchip PIC32MZ[DA] family of microcontrollers.
+
+endchoice
+
+choice
+	prompt "Board select"
+
+config TARGET_PIC32MZDASK
+	bool "Microchip PIC32MZ[DA] Starter Kit"
+	depends on SOC_PIC32MZDA
+	help
+	  This supports Microchip PIC32MZ[DA] Starter Kit.
+
+endchoice
+
+source "board/microchip/pic32mzda/Kconfig"
+
+endmenu

arch/mips/mach-pic32/Makefile

@@ -0,0 +1,7 @@
+# (C) Copyright 2015
+# Purna Chandra Mandal, purna.mandal@microchip.com.
+#
+# SPDX-License-Identifier:      GPL-2.0+
+#
+
+obj-y = cpu.o lowlevel_init.o reset.o

arch/mips/mach-pic32/cpu.c

@@ -0,0 +1,156 @@
+/*
+ * Copyright (C) 2015
+ * Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ */
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <mach/pic32.h>
+#include <mach/ddr.h>
+#include <dt-bindings/clock/microchip,clock.h>
+
+/* Flash prefetch */
+#define PRECON          0x00
+
+/* Flash ECCCON */
+#define ECC_MASK	0x03
+#define ECC_SHIFT	4
+
+#define CLK_MHZ(x)	((x) / 1000000)
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static ulong clk_get_cpu_rate(void)
+{
+	int ret;
+	struct udevice *dev;
+
+	ret = uclass_get_device(UCLASS_CLK, 0, &dev);
+	if (ret) {
+		panic("uclass-clk: device not found\n");
+		return 0;
+	}
+
+	return clk_get_rate(dev);
+}
+
+/* initialize prefetch module related to cpu_clk */
+static void prefetch_init(void)
+{
+	struct pic32_reg_atomic *regs;
+	const void __iomem *base;
+	int v, nr_waits;
+	ulong rate;
+
+	/* cpu frequency in MHZ */
+	rate = clk_get_cpu_rate() / 1000000;
+
+	/* get flash ECC type */
+	base = pic32_get_syscfg_base();
+	v = (readl(base + CFGCON) >> ECC_SHIFT) & ECC_MASK;
+
+	if (v < 2) {
+		if (rate < 66)
+			nr_waits = 0;
+		else if (rate < 133)
+			nr_waits = 1;
+		else
+			nr_waits = 2;
+	} else {
+		if (rate <= 83)
+			nr_waits = 0;
+		else if (rate <= 166)
+			nr_waits = 1;
+		else
+			nr_waits = 2;
+	}
+
+	regs = ioremap(PREFETCH_BASE + PRECON, sizeof(*regs));
+	writel(nr_waits, &regs->raw);
+
+	/* Enable prefetch for all */
+	writel(0x30, &regs->set);
+	iounmap(regs);
+}
+
+/* arch specific CPU init after DM */
+int arch_cpu_init_dm(void)
+{
+	/* flash prefetch */
+	prefetch_init();
+	return 0;
+}
+
+/* Un-gate DDR2 modules (gated by default) */
+static void ddr2_pmd_ungate(void)
+{
+	void __iomem *regs;
+
+	regs = pic32_get_syscfg_base();
+	writel(0, regs + PMD7);
+}
+
+/* initialize the DDR2 Controller and DDR2 PHY */
+phys_size_t initdram(int board_type)
+{
+	ddr2_pmd_ungate();
+	ddr2_phy_init();
+	ddr2_ctrl_init();
+	return ddr2_calculate_size();
+}
+
+int misc_init_r(void)
+{
+	set_io_port_base(0);
+	return 0;
+}
+
+#ifdef CONFIG_DISPLAY_BOARDINFO
+const char *get_core_name(void)
+{
+	u32 proc_id;
+	const char *str;
+
+	proc_id = read_c0_prid();
+	switch (proc_id) {
+	case 0x19e28:
+		str = "PIC32MZ[DA]";
+		break;
+	default:
+		str = "UNKNOWN";
+	}
+
+	return str;
+}
+#endif
+#ifdef CONFIG_CMD_CLK
+int soc_clk_dump(void)
+{
+	int i, ret;
+	struct udevice *dev;
+
+	ret = uclass_get_device(UCLASS_CLK, 0, &dev);
+	if (ret) {
+		printf("clk-uclass not found\n");
+		return ret;
+	}
+
+	printf("PLL Speed: %lu MHz\n",
+	       CLK_MHZ(clk_get_periph_rate(dev, PLLCLK)));
+	printf("CPU Speed: %lu MHz\n", CLK_MHZ(clk_get_rate(dev)));
+	printf("MPLL Speed: %lu MHz\n",
+	       CLK_MHZ(clk_get_periph_rate(dev, MPLL)));
+
+	for (i = PB1CLK; i <= PB7CLK; i++)
+		printf("PB%d Clock Speed: %lu MHz\n", i - PB1CLK + 1,
+		       CLK_MHZ(clk_get_periph_rate(dev, i)));
+
+	for (i = REF1CLK; i <= REF5CLK; i++)
+		printf("REFO%d Clock Speed: %lu MHz\n", i - REF1CLK + 1,
+		       CLK_MHZ(clk_get_periph_rate(dev, i)));
+	return 0;
+}
+#endif

arch/mips/mach-pic32/include/mach/ddr.h

@@ -0,0 +1,32 @@
+/*
+ * (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ */
+
+#ifndef __MICROCHIP_PIC32_DDR_H
+#define __MICROCHIP_PIC32_DDR_H
+
+/* called by initdram() function */
+void ddr2_phy_init(void);
+void ddr2_ctrl_init(void);
+phys_size_t ddr2_calculate_size(void);
+
+/* Maximum number of agents */
+#define NUM_AGENTS		5
+
+/* Board can provide agent specific parameters for arbitration by
+ * filling struct ddr2_arbiter_params for all the agents and
+ * implementing board_get_ddr_arbiter_params() to return the filled
+ * structure.
+ */
+struct ddr2_arbiter_params {
+	u32 min_limit;	/* min bursts to execute per arbitration */
+	u32 req_period; /* request period threshold for accepted cmds */
+	u32 min_cmd_acpt; /* min number of accepted cmds */
+};
+
+const struct ddr2_arbiter_params *board_get_ddr_arbiter_params(void);
+
+#endif /* __MICROCHIP_PIC32_DDR_H */

arch/mips/mach-pic32/include/mach/pic32.h

@@ -0,0 +1,79 @@
+/*
+ * (c) 2015 Paul Thacker <paul.thacker@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ */
+
+#ifndef __PIC32_REGS_H__
+#define __PIC32_REGS_H__
+
+#include <asm/io.h>
+
+/* System Configuration */
+#define PIC32_CFG_BASE		0x1f800000
+
+/* System config register offsets */
+#define CFGCON		0x0000
+#define DEVID		0x0020
+#define SYSKEY		0x0030
+#define PMD1		0x0040
+#define PMD7		0x00a0
+#define CFGEBIA		0x00c0
+#define CFGEBIC		0x00d0
+#define CFGPG		0x00e0
+#define CFGMPLL		0x0100
+
+/* Non Volatile Memory (NOR flash) */
+#define PIC32_NVM_BASE		(PIC32_CFG_BASE + 0x0600)
+/* Oscillator Configuration */
+#define PIC32_OSC_BASE		(PIC32_CFG_BASE + 0x1200)
+/* Peripheral Pin Select Input */
+#define PPS_IN_BASE		0x1f801400
+/* Peripheral Pin Select Output */
+#define PPS_OUT_BASE		0x1f801500
+/* Pin Config */
+#define PINCTRL_BASE		0x1f860000
+
+/* USB Core */
+#define PIC32_USB_CORE_BASE	0x1f8e3000
+#define PIC32_USB_CTRL_BASE	0x1f884000
+
+/* SPI1-SPI6 */
+#define PIC32_SPI1_BASE		0x1f821000
+
+/* Prefetch Module */
+#define PREFETCH_BASE		0x1f8e0000
+
+/* DDR2 Controller */
+#define PIC32_DDR2C_BASE	0x1f8e8000
+
+/* DDR2 PHY */
+#define PIC32_DDR2P_BASE	0x1f8e9100
+
+/* EBI */
+#define PIC32_EBI_BASE		0x1f8e1000
+
+/* SQI */
+#define PIC32_SQI_BASE		0x1f8e2000
+
+struct pic32_reg_atomic {
+	u32 raw;
+	u32 clr;
+	u32 set;
+	u32 inv;
+};
+
+#define _CLR_OFFSET	0x04
+#define _SET_OFFSET	0x08
+#define _INV_OFFSET	0x0c
+
+static inline void __iomem *pic32_get_syscfg_base(void)
+{
+	return (void __iomem *)CKSEG1ADDR(PIC32_CFG_BASE);
+}
+
+/* Core */
+const char *get_core_name(void);
+
+#endif	/* __PIC32_REGS_H__ */

arch/mips/mach-pic32/lowlevel_init.S

@@ -0,0 +1,27 @@
+/*
+ * (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+*/
+
+#include <config.h>
+#include <asm/regdef.h>
+#include <asm/mipsregs.h>
+#include <asm/asm.h>
+
+LEAF(lowlevel_init)
+	/*
+	 * Establish Cause
+	 * (set IV bit)
+	 */
+	li	t1, 0x00800000
+	mtc0	t1, CP0_CAUSE
+
+	/* Establish Wired (and Random) */
+	mtc0	zero, CP0_WIRED
+	 nop
+
+	jr	ra
+	 nop
+	END(lowlevel_init)

arch/mips/mach-pic32/reset.c

@@ -0,0 +1,36 @@
+/*
+ * (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <mach/pic32.h>
+
+/* SYSKEY */
+#define UNLOCK_KEY1	0xaa996655
+#define UNLOCK_KEY2	0x556699aa
+#define LOCK_KEY	0
+
+#define RSWRST          0x1250
+
+void _machine_restart(void)
+{
+	void __iomem *base;
+
+	base = pic32_get_syscfg_base();
+
+	/* unlock sequence */
+	writel(LOCK_KEY, base + SYSKEY);
+	writel(UNLOCK_KEY1, base + SYSKEY);
+	writel(UNLOCK_KEY2, base + SYSKEY);
+
+	/* soft reset */
+	writel(0x1, base + RSWRST);
+	(void) readl(base + RSWRST);
+
+	while (1)
+		;
+}

board/imgtec/malta/malta.c

@@ -130,24 +130,26 @@ void _machine_restart(void)
 
 int board_early_init_f(void)
 {
-	void *io_base;
+	ulong io_base;
 
 	/* choose correct PCI I/O base */
 	switch (malta_sys_con()) {
 	case SYSCON_GT64120:
-		io_base = (void *)CKSEG1ADDR(MALTA_GT_PCIIO_BASE);
+		io_base = CKSEG1ADDR(MALTA_GT_PCIIO_BASE);
 		break;
 
 	case SYSCON_MSC01:
-		io_base = (void *)CKSEG1ADDR(MALTA_MSC01_PCIIO_BASE);
+		io_base = CKSEG1ADDR(MALTA_MSC01_PCIIO_BASE);
 		break;
 
 	default:
 		return -1;
 	}
 
+	set_io_port_base(io_base);
+
 	/* setup FDC37M817 super I/O controller */
-	malta_superio_init(io_base);
+	malta_superio_init();
 
 	return 0;
 }
@@ -179,8 +181,6 @@ void pci_init_board(void)
 
 	switch (malta_sys_con()) {
 	case SYSCON_GT64120:
-		set_io_port_base(CKSEG1ADDR(MALTA_GT_PCIIO_BASE));
-
 		gt64120_pci_init((void *)CKSEG1ADDR(MALTA_GT_BASE),
 				 0x00000000, 0x00000000, CONFIG_SYS_MEM_SIZE,
 				 0x10000000, 0x10000000, 128 * 1024 * 1024,
@@ -189,8 +189,6 @@ void pci_init_board(void)
 
 	default:
 	case SYSCON_MSC01:
-		set_io_port_base(CKSEG1ADDR(MALTA_MSC01_PCIIO_BASE));
-
 		msc01_pci_init((void *)CKSEG1ADDR(MALTA_MSC01_PCI_BASE),
 			       0x00000000, 0x00000000, CONFIG_SYS_MEM_SIZE,
 			       MALTA_MSC01_PCIMEM_MAP,

board/imgtec/malta/superio.c

@@ -45,19 +45,19 @@ static struct {
 	{ SIOCONF_ACTIVATE,	0x01 },
 };
 
-void malta_superio_init(void *io_base)
+void malta_superio_init(void)
 {
 	unsigned i;
 
 	/* enter config state */
-	writeb(SIOCONF_ENTER_SETUP, io_base + SIO_CONF_PORT);
+	outb(SIOCONF_ENTER_SETUP, SIO_CONF_PORT);
 
 	/* configure peripherals */
 	for (i = 0; i < ARRAY_SIZE(sio_config); i++) {
-		writeb(sio_config[i].key, io_base + SIO_CONF_PORT);
-		writeb(sio_config[i].data, io_base + SIO_DATA_PORT);
+		outb(sio_config[i].key, SIO_CONF_PORT);
+		outb(sio_config[i].data, SIO_DATA_PORT);
 	}
 
 	/* exit config state */
-	writeb(SIOCONF_EXIT_SETUP, io_base + SIO_CONF_PORT);
+	outb(SIOCONF_EXIT_SETUP, SIO_CONF_PORT);
 }

board/imgtec/malta/superio.h

@@ -10,6 +10,6 @@
 #ifndef __BOARD_MALTA_SUPERIO_H__
 #define __BOARD_MALTA_SUPERIO_H__
 
-extern void malta_superio_init(void *io_base);
+void malta_superio_init(void);
 
 #endif /* __BOARD_MALTA_SUPERIO_H__ */

board/microchip/pic32mzda/Kconfig

@@ -0,0 +1,13 @@
+
+if TARGET_PIC32MZDASK
+
+config SYS_BOARD
+	default "pic32mzda"
+
+config SYS_VENDOR
+	default "microchip"
+
+config SYS_CONFIG_NAME
+	default "pic32mzdask"
+
+endif

board/microchip/pic32mzda/MAINTAINERS

@@ -0,0 +1,6 @@
+PIC32MZDASK BOARD
+M:	Purna Chandra Mandal <purna.mandal@microchip.com>
+S:	Maintained
+F:	board/microchip/pic32mzda/
+F:	include/configs/pic32mzdask.h
+F:	configs/pic32mzdask_defconfig

board/microchip/pic32mzda/Makefile

@@ -0,0 +1,7 @@
+#
+# (C) Copyright 2015
+# Purna Chandra Mandal, purna.mandal@microchip.com.
+#
+# SPDX-License-Identifier:      GPL-2.0+
+#
+obj-y := pic32mzda.o

board/microchip/pic32mzda/README

@@ -0,0 +1,22 @@
+/*
+ * (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
+ */
+
+PIC32MZ[DA] Starter Kit
+----------------------------------------
+PIC32MZ[DA] Starter Kit is based on PIC32MZ[DA] family of micro-controller.
+This family is powered by MIPS M14KEC 32bit general purpose core and has
+advanced microcontroller features and peripherals.
+
+This processor boots with proprietary stage1 bootloader running from internal
+boot-flash. Stage1 bootloader inturns locates and jumps to U-Boot programmed
+on internal program-flash. Finally U-Boot loads OS image (along with other
+required files for booting) from either uSD card, or ethernet, or from USB
+storage.
+
+To boot Linux following three files are mandatory - uEnv.txt (custom U-Boot
+environment file), uImage, *.dtb (platform device-tree-blob file).
+
+U-Boot jumps to Linux using UHI specification.
+
+Visit http://microchip.com for details.

board/microchip/pic32mzda/pic32mzda.c

@@ -0,0 +1,31 @@
+/*
+ * Microchip PIC32MZ[DA] Starter Kit board
+ *
+ * Copyright (C) 2015, Microchip Technology Inc.
+ * Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <clk.h>
+#include <mach/pic32.h>
+
+#ifdef CONFIG_DISPLAY_BOARDINFO
+int checkboard(void)
+{
+	ulong rate = 0;
+	struct udevice *dev;
+
+	printf("Core: %s\n", get_core_name());
+
+	if (!uclass_get_device(UCLASS_CLK, 0, &dev)) {
+		rate = clk_get_rate(dev);
+		printf("CPU Speed: %lu MHz\n", rate / 1000000);
+	}
+
+	return 0;
+}
+#endif

configs/pic32mzdask_defconfig

@@ -0,0 +1,34 @@
+CONFIG_MIPS=y
+CONFIG_SYS_MALLOC_F_LEN=0x600
+CONFIG_DM_SERIAL=y
+CONFIG_DM_GPIO=y
+CONFIG_MACH_PIC32=y
+# CONFIG_MIPS_BOOT_ENV_LEGACY is not set
+CONFIG_MIPS_BOOT_FDT=y
+CONFIG_DEFAULT_DEVICE_TREE="pic32mzda_sk"
+CONFIG_HUSH_PARSER=y
+CONFIG_SYS_PROMPT="dask # "
+# CONFIG_CMD_IMLS is not set
+# CONFIG_CMD_SAVEENV is not set
+CONFIG_LOOPW=y
+CONFIG_CMD_MEMTEST=y
+CONFIG_CMD_MEMINFO=y
+# CONFIG_CMD_FLASH is not set
+# CONFIG_CMD_FPGA is not set
+CONFIG_CMD_GPIO=y
+CONFIG_CMD_RARP=y
+CONFIG_CMD_DHCP=y
+CONFIG_CMD_PING=y
+CONFIG_CMD_TIME=y
+CONFIG_OF_EMBED=y
+CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_CLK=y
+CONFIG_DM_MMC=y
+CONFIG_PIC32_SDHCI=y
+CONFIG_DM_ETH=y
+CONFIG_PIC32_ETH=y
+CONFIG_PINCTRL=y
+# CONFIG_PINCTRL_FULL is not set
+CONFIG_SYS_VSNPRINTF=y
+CONFIG_USE_TINY_PRINTF=y
+CONFIG_CMD_DHRYSTONE=y

doc/device-tree-bindings/clock/microchip,pic32-clock.txt

@@ -0,0 +1,33 @@
+* Microchip PIC32 Clock and Oscillator
+
+Microchip PIC32 clock tree consists of few oscillators, PLLs,
+multiplexers and few divider modules capable of supplying clocks
+to various controllers within SoC and also to off-chip.
+
+PIC32 clock controller output is defined by indices as defined
+in [0]
+
+[0] include/dt-bindings/clock/microchip,clock.h
+
+Required Properties:
+- compatible: should be "microchip,pic32mzda_clk"
+- reg: physical base address of the controller and length of memory mapped
+       region.
+- #clock-cells: should be 1.
+
+Example: Clock controller node:
+
+	clock: clk@1f801200 {
+		compatible = "microchip,pic32mzda-clk";
+		reg = <0x1f801200 0x1000>;
+	};
+
+Example: UART controller node that consumes the clock generated by the clock
+controller:
+
+	uart1: serial@1f822000 {
+		compatible = "microchip,pic32mzda-uart";
+		reg = <0xbf822000 0x50>;
+		interrupts = <112 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&clock PB2CLK>;
+	};

doc/device-tree-bindings/serial/microchip,pic32-uart.txt

@@ -0,0 +1,5 @@
+* Microchip PIC32 serial UART
+
+Required properties:
+- compatible: must be "microchip,pic32mzda-uart".
+- reg: exactly one register range.

drivers/Makefile

@@ -69,4 +69,5 @@ obj-y += soc/
 obj-$(CONFIG_REMOTEPROC) += remoteproc/
 obj-y += thermal/
 
+obj-$(CONFIG_MACH_PIC32) += ddr/microchip/
 endif

drivers/clk/Makefile

@@ -9,3 +9,4 @@ obj-$(CONFIG_CLK) += clk-uclass.o clk_fixed_rate.o
 obj-$(CONFIG_ROCKCHIP_RK3036) += clk_rk3036.o
 obj-$(CONFIG_ROCKCHIP_RK3288) += clk_rk3288.o
 obj-$(CONFIG_SANDBOX) += clk_sandbox.o
+obj-$(CONFIG_MACH_PIC32) += clk_pic32.o

drivers/clk/clk_pic32.c

@@ -0,0 +1,433 @@
+/*
+ * Copyright (C) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <div64.h>
+#include <wait_bit.h>
+#include <dm/lists.h>
+#include <asm/io.h>
+#include <mach/pic32.h>
+#include <dt-bindings/clock/microchip,clock.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* Primary oscillator */
+#define SYS_POSC_CLK_HZ	24000000
+
+/* FRC clk rate */
+#define SYS_FRC_CLK_HZ	8000000
+
+/* Clock Registers */
+#define OSCCON		0x0000
+#define OSCTUNE		0x0010
+#define SPLLCON		0x0020
+#define REFO1CON	0x0080
+#define REFO1TRIM	0x0090
+#define PB1DIV		0x0140
+
+/* SPLL */
+#define ICLK_MASK	0x00000080
+#define PLLIDIV_MASK	0x00000007
+#define PLLODIV_MASK	0x00000007
+#define CUROSC_MASK	0x00000007
+#define PLLMUL_MASK	0x0000007F
+#define FRCDIV_MASK	0x00000007
+
+/* PBCLK */
+#define PBDIV_MASK	0x00000007
+
+/* SYSCLK MUX */
+#define SCLK_SRC_FRC1	0
+#define SCLK_SRC_SPLL	1
+#define SCLK_SRC_POSC	2
+#define SCLK_SRC_FRC2	7
+
+/* Reference Oscillator Control Reg fields */
+#define REFO_SEL_MASK	0x0f
+#define REFO_SEL_SHIFT	0
+#define REFO_ACTIVE	BIT(8)
+#define REFO_DIVSW_EN	BIT(9)
+#define REFO_OE		BIT(12)
+#define REFO_ON		BIT(15)
+#define REFO_DIV_SHIFT	16
+#define REFO_DIV_MASK	0x7fff
+
+/* Reference Oscillator Trim Register Fields */
+#define REFO_TRIM_REG	0x10
+#define REFO_TRIM_MASK	0x1ff
+#define REFO_TRIM_SHIFT	23
+#define REFO_TRIM_MAX	511
+
+#define ROCLK_SRC_SCLK		0x0
+#define ROCLK_SRC_SPLL		0x7
+#define ROCLK_SRC_ROCLKI	0x8
+
+/* Memory PLL */
+#define MPLL_IDIV		0x3f
+#define MPLL_MULT		0xff
+#define MPLL_ODIV1		0x7
+#define MPLL_ODIV2		0x7
+#define MPLL_VREG_RDY		BIT(23)
+#define MPLL_RDY		BIT(31)
+#define MPLL_IDIV_SHIFT		0
+#define MPLL_MULT_SHIFT		8
+#define MPLL_ODIV1_SHIFT	24
+#define MPLL_ODIV2_SHIFT	27
+#define MPLL_IDIV_INIT		0x03
+#define MPLL_MULT_INIT		0x32
+#define MPLL_ODIV1_INIT		0x02
+#define MPLL_ODIV2_INIT		0x01
+
+struct pic32_clk_priv {
+	void __iomem *iobase;
+	void __iomem *syscfg_base;
+};
+
+static ulong pic32_get_pll_rate(struct pic32_clk_priv *priv)
+{
+	u32 iclk, idiv, odiv, mult;
+	ulong plliclk, v;
+
+	v = readl(priv->iobase + SPLLCON);
+	iclk = (v & ICLK_MASK);
+	idiv = ((v >> 8) & PLLIDIV_MASK) + 1;
+	odiv = ((v >> 24) & PLLODIV_MASK);
+	mult = ((v >> 16) & PLLMUL_MASK) + 1;
+
+	plliclk = iclk ? SYS_FRC_CLK_HZ : SYS_POSC_CLK_HZ;
+
+	if (odiv < 2)
+		odiv = 2;
+	else if (odiv < 5)
+		odiv = (1 << odiv);
+	else
+		odiv = 32;
+
+	return ((plliclk / idiv) * mult) / odiv;
+}
+
+static ulong pic32_get_sysclk(struct pic32_clk_priv *priv)
+{
+	ulong v;
+	ulong hz;
+	ulong div, frcdiv;
+	ulong curr_osc;
+
+	/* get clk source */
+	v = readl(priv->iobase + OSCCON);
+	curr_osc = (v >> 12) & CUROSC_MASK;
+	switch (curr_osc) {
+	case SCLK_SRC_FRC1:
+	case SCLK_SRC_FRC2:
+		frcdiv = ((v >> 24) & FRCDIV_MASK);
+		div = ((1 << frcdiv) + 1) + (128 * (frcdiv == 7));
+		hz = SYS_FRC_CLK_HZ / div;
+		break;
+
+	case SCLK_SRC_SPLL:
+		hz = pic32_get_pll_rate(priv);
+		break;
+
+	case SCLK_SRC_POSC:
+		hz = SYS_POSC_CLK_HZ;
+		break;
+
+	default:
+		hz = 0;
+		printf("clk: unknown sclk_src.\n");
+		break;
+	}
+
+	return hz;
+}
+
+static ulong pic32_get_pbclk(struct pic32_clk_priv *priv, int periph)
+{
+	void __iomem *reg;
+	ulong div, clk_freq;
+
+	WARN_ON((periph < PB1CLK) || (periph > PB7CLK));
+
+	clk_freq = pic32_get_sysclk(priv);
+
+	reg = priv->iobase + PB1DIV + (periph - PB1CLK) * 0x10;
+	div = (readl(reg) & PBDIV_MASK) + 1;
+
+	return clk_freq / div;
+}
+
+static ulong pic32_get_cpuclk(struct pic32_clk_priv *priv)
+{
+	return pic32_get_pbclk(priv, PB7CLK);
+}
+
+static ulong pic32_set_refclk(struct pic32_clk_priv *priv, int periph,
+			      int parent_rate, int rate, int parent_id)
+{
+	void __iomem *reg;
+	u32 div, trim, v;
+	u64 frac;
+
+	WARN_ON((periph < REF1CLK) || (periph > REF5CLK));
+
+	/* calculate dividers,
+	 *   rate = parent_rate / [2 * (div + (trim / 512))]
+	 */
+	if (parent_rate <= rate) {
+		div = 0;
+		trim = 0;
+	} else {
+		div = parent_rate / (rate << 1);
+		frac = parent_rate;
+		frac <<= 8;
+		do_div(frac, rate);
+		frac -= (u64)(div << 9);
+		trim = (frac >= REFO_TRIM_MAX) ? REFO_TRIM_MAX : (u32)frac;
+	}
+
+	reg = priv->iobase + REFO1CON + (periph - REF1CLK) * 0x20;
+
+	/* disable clk */
+	writel(REFO_ON | REFO_OE, reg + _CLR_OFFSET);
+
+	/* wait till previous src change is active */
+	wait_for_bit(__func__, reg, REFO_DIVSW_EN | REFO_ACTIVE,
+		     false, CONFIG_SYS_HZ, false);
+
+	/* parent_id */
+	v = readl(reg);
+	v &= ~(REFO_SEL_MASK << REFO_SEL_SHIFT);
+	v |= (parent_id << REFO_SEL_SHIFT);
+
+	/* apply rodiv */
+	v &= ~(REFO_DIV_MASK << REFO_DIV_SHIFT);
+	v |= (div << REFO_DIV_SHIFT);
+	writel(v, reg);
+
+	/* apply trim */
+	v = readl(reg + REFO_TRIM_REG);
+	v &= ~(REFO_TRIM_MASK << REFO_TRIM_SHIFT);
+	v |= (trim << REFO_TRIM_SHIFT);
+	writel(v, reg + REFO_TRIM_REG);
+
+	/* enable clk */
+	writel(REFO_ON | REFO_OE, reg + _SET_OFFSET);
+
+	/* switch divider */
+	writel(REFO_DIVSW_EN, reg + _SET_OFFSET);
+
+	/* wait for divider switching to complete */
+	return wait_for_bit(__func__, reg, REFO_DIVSW_EN, false,
+			    CONFIG_SYS_HZ, false);
+}
+
+static ulong pic32_get_refclk(struct pic32_clk_priv *priv, int periph)
+{
+	u32 rodiv, rotrim, rosel, v, parent_rate;
+	void __iomem *reg;
+	u64 rate64;
+
+	WARN_ON((periph < REF1CLK) || (periph > REF5CLK));
+
+	reg = priv->iobase + REFO1CON + (periph - REF1CLK) * 0x20;
+	v = readl(reg);
+	/* get rosel */
+	rosel = (v >> REFO_SEL_SHIFT) & REFO_SEL_MASK;
+	/* get div */
+	rodiv = (v >> REFO_DIV_SHIFT) & REFO_DIV_MASK;
+
+	/* get trim */
+	v = readl(reg + REFO_TRIM_REG);
+	rotrim = (v >> REFO_TRIM_SHIFT) & REFO_TRIM_MASK;
+
+	if (!rodiv)
+		return 0;
+
+	/* get parent rate */
+	switch (rosel) {
+	case ROCLK_SRC_SCLK:
+		parent_rate = pic32_get_cpuclk(priv);
+		break;
+	case ROCLK_SRC_SPLL:
+		parent_rate = pic32_get_pll_rate(priv);
+		break;
+	default:
+		parent_rate = 0;
+		break;
+	}
+
+	/* Calculation
+	 * rate = parent_rate / [2 * (div + (trim / 512))]
+	 */
+	if (rotrim) {
+		rodiv <<= 9;
+		rodiv += rotrim;
+		rate64 = parent_rate;
+		rate64 <<= 8;
+		do_div(rate64, rodiv);
+		v = (u32)rate64;
+	} else {
+		v = parent_rate / (rodiv << 1);
+	}
+	return v;
+}
+
+static ulong pic32_get_mpll_rate(struct pic32_clk_priv *priv)
+{
+	u32 v, idiv, mul;
+	u32 odiv1, odiv2;
+	u64 rate;
+
+	v = readl(priv->syscfg_base + CFGMPLL);
+	idiv = v & MPLL_IDIV;
+	mul = (v >> MPLL_MULT_SHIFT) & MPLL_MULT;
+	odiv1 = (v >> MPLL_ODIV1_SHIFT) & MPLL_ODIV1;
+	odiv2 = (v >> MPLL_ODIV2_SHIFT) & MPLL_ODIV2;
+
+	rate = (SYS_POSC_CLK_HZ / idiv) * mul;
+	do_div(rate, odiv1);
+	do_div(rate, odiv2);
+
+	return (ulong)rate;
+}
+
+static int pic32_mpll_init(struct pic32_clk_priv *priv)
+{
+	u32 v, mask;
+
+	/* initialize */
+	v = (MPLL_IDIV_INIT << MPLL_IDIV_SHIFT) |
+	    (MPLL_MULT_INIT << MPLL_MULT_SHIFT) |
+	    (MPLL_ODIV1_INIT << MPLL_ODIV1_SHIFT) |
+	    (MPLL_ODIV2_INIT << MPLL_ODIV2_SHIFT);
+
+	writel(v, priv->syscfg_base + CFGMPLL);
+
+	/* Wait for ready */
+	mask = MPLL_RDY | MPLL_VREG_RDY;
+	return wait_for_bit(__func__, priv->syscfg_base + CFGMPLL, mask,
+			    true, get_tbclk(), false);
+}
+
+static void pic32_clk_init(struct udevice *dev)
+{
+	const void *blob = gd->fdt_blob;
+	struct pic32_clk_priv *priv;
+	ulong rate, pll_hz;
+	char propname[50];
+	int i;
+
+	priv = dev_get_priv(dev);
+	pll_hz = pic32_get_pll_rate(priv);
+
+	/* Initialize REFOs as not initialized and enabled on reset. */
+	for (i = REF1CLK; i <= REF5CLK; i++) {
+		snprintf(propname, sizeof(propname),
+			 "microchip,refo%d-frequency", i - REF1CLK + 1);
+		rate = fdtdec_get_int(blob, dev->of_offset, propname, 0);
+		if (rate)
+			pic32_set_refclk(priv, i, pll_hz, rate, ROCLK_SRC_SPLL);
+	}
+
+	/* Memory PLL */
+	pic32_mpll_init(priv);
+}
+
+static ulong pic32_clk_get_rate(struct udevice *dev)
+{
+	struct pic32_clk_priv *priv = dev_get_priv(dev);
+
+	return pic32_get_cpuclk(priv);
+}
+
+static ulong pic32_get_periph_rate(struct udevice *dev, int periph)
+{
+	struct pic32_clk_priv *priv = dev_get_priv(dev);
+	ulong rate;
+
+	switch (periph) {
+	case PB1CLK ... PB7CLK:
+		rate = pic32_get_pbclk(priv, periph);
+		break;
+	case REF1CLK ... REF5CLK:
+		rate = pic32_get_refclk(priv, periph);
+		break;
+	case PLLCLK:
+		rate = pic32_get_pll_rate(priv);
+		break;
+	case MPLL:
+		rate = pic32_get_mpll_rate(priv);
+		break;
+	default:
+		rate = 0;
+		break;
+	}
+
+	return rate;
+}
+
+static ulong pic32_set_periph_rate(struct udevice *dev, int periph, ulong rate)
+{
+	struct pic32_clk_priv *priv = dev_get_priv(dev);
+	ulong pll_hz;
+
+	switch (periph) {
+	case REF1CLK ... REF5CLK:
+		pll_hz = pic32_get_pll_rate(priv);
+		pic32_set_refclk(priv, periph, pll_hz, rate, ROCLK_SRC_SPLL);
+		break;
+	default:
+		break;
+	}
+
+	return rate;
+}
+
+static struct clk_ops pic32_pic32_clk_ops = {
+	.get_rate = pic32_clk_get_rate,
+	.set_periph_rate = pic32_set_periph_rate,
+	.get_periph_rate = pic32_get_periph_rate,
+};
+
+static int pic32_clk_probe(struct udevice *dev)
+{
+	struct pic32_clk_priv *priv = dev_get_priv(dev);
+	fdt_addr_t addr;
+	fdt_size_t size;
+
+	addr = fdtdec_get_addr_size(gd->fdt_blob, dev->of_offset, "reg", &size);
+	if (addr == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	priv->iobase = ioremap(addr, size);
+	if (!priv->iobase)
+		return -EINVAL;
+
+	priv->syscfg_base = pic32_get_syscfg_base();
+
+	/* initialize clocks */
+	pic32_clk_init(dev);
+
+	return 0;
+}
+
+static const struct udevice_id pic32_clk_ids[] = {
+	{ .compatible = "microchip,pic32mzda-clk"},
+	{}
+};
+
+U_BOOT_DRIVER(pic32_clk) = {
+	.name		= "pic32_clk",
+	.id		= UCLASS_CLK,
+	.of_match	= pic32_clk_ids,
+	.flags		= DM_FLAG_PRE_RELOC,
+	.ops		= &pic32_pic32_clk_ops,
+	.probe		= pic32_clk_probe,
+	.priv_auto_alloc_size = sizeof(struct pic32_clk_priv),
+};

drivers/ddr/microchip/Makefile

@@ -0,0 +1,6 @@
+#
+# Copyright (C) 2015 Microchip Technology Inc.
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+obj-$(CONFIG_MACH_PIC32) += ddr2.o

drivers/ddr/microchip/ddr2.c

@@ -0,0 +1,278 @@
+/*
+ * (c) 2015 Paul Thacker <paul.thacker@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ */
+#include <common.h>
+#include <wait_bit.h>
+#include <linux/kernel.h>
+#include <linux/bitops.h>
+#include <mach/pic32.h>
+#include <mach/ddr.h>
+
+#include "ddr2_regs.h"
+#include "ddr2_timing.h"
+
+/* init DDR2 Phy */
+void ddr2_phy_init(void)
+{
+	struct ddr2_phy_regs *ddr2_phy;
+	u32 pad_ctl;
+
+	ddr2_phy = ioremap(PIC32_DDR2P_BASE, sizeof(*ddr2_phy));
+
+	/* PHY_DLL_RECALIB */
+	writel(DELAY_START_VAL(3) | DISABLE_RECALIB(0) |
+	       RECALIB_CNT(0x10), &ddr2_phy->dll_recalib);
+
+	/* PHY_PAD_CTRL */
+	pad_ctl = ODT_SEL | ODT_EN | DRIVE_SEL(0) |
+		  ODT_PULLDOWN(2) | ODT_PULLUP(3) |
+		  EXTRA_OEN_CLK(0) | NOEXT_DLL |
+		  DLR_DFT_WRCMD | HALF_RATE |
+		  DRVSTR_PFET(0xe) | DRVSTR_NFET(0xe) |
+		  RCVR_EN | PREAMBLE_DLY(2);
+	writel(pad_ctl, &ddr2_phy->pad_ctrl);
+
+	/* SCL_CONFIG_0 */
+	writel(SCL_BURST8 | SCL_DDR_CONNECTED | SCL_RCAS_LAT(RL) |
+	       SCL_ODTCSWW, &ddr2_phy->scl_config_1);
+
+	/* SCL_CONFIG_1 */
+	writel(SCL_CSEN | SCL_WCAS_LAT(WL), &ddr2_phy->scl_config_2);
+
+	/* SCL_LAT */
+	writel(SCL_CAPCLKDLY(3) | SCL_DDRCLKDLY(4), &ddr2_phy->scl_latency);
+}
+
+/* start phy self calibration logic */
+static int ddr2_phy_calib_start(void)
+{
+	struct ddr2_phy_regs *ddr2_phy;
+
+	ddr2_phy = ioremap(PIC32_DDR2P_BASE, sizeof(*ddr2_phy));
+
+	/* DDR Phy SCL Start */
+	writel(SCL_START | SCL_EN, &ddr2_phy->scl_start);
+
+	/* Wait for SCL for data byte to pass */
+	return wait_for_bit(__func__, &ddr2_phy->scl_start, SCL_LUBPASS,
+			    true, CONFIG_SYS_HZ, false);
+}
+
+/* DDR2 Controller initialization */
+
+/* Target Agent Arbiter */
+static void ddr_set_arbiter(struct ddr2_ctrl_regs *ctrl,
+			    const struct ddr2_arbiter_params *const param)
+{
+	int i;
+
+	for (i = 0; i < NUM_AGENTS; i++) {
+		/* set min burst size */
+		writel(i * MIN_LIM_WIDTH, &ctrl->tsel);
+		writel(param->min_limit, &ctrl->minlim);
+
+		/* set request period (4 * req_period clocks) */
+		writel(i * RQST_PERIOD_WIDTH, &ctrl->tsel);
+		writel(param->req_period, &ctrl->reqprd);
+
+		/* set number of burst accepted */
+		writel(i * MIN_CMDACPT_WIDTH, &ctrl->tsel);
+		writel(param->min_cmd_acpt, &ctrl->mincmd);
+	}
+}
+
+const struct ddr2_arbiter_params *__weak board_get_ddr_arbiter_params(void)
+{
+	/* default arbiter parameters */
+	static const struct ddr2_arbiter_params arb_params[] = {
+		{ .min_limit = 0x1f, .req_period = 0xff, .min_cmd_acpt = 0x04,},
+		{ .min_limit = 0x1f, .req_period = 0xff, .min_cmd_acpt = 0x10,},
+		{ .min_limit = 0x1f, .req_period = 0xff, .min_cmd_acpt = 0x10,},
+		{ .min_limit = 0x04, .req_period = 0xff, .min_cmd_acpt = 0x04,},
+		{ .min_limit = 0x04, .req_period = 0xff, .min_cmd_acpt = 0x04,},
+	};
+
+	return &arb_params[0];
+}
+
+static void host_load_cmd(struct ddr2_ctrl_regs *ctrl, u32 cmd_idx,
+			  u32 hostcmd2, u32 hostcmd1, u32 delay)
+{
+	u32 hc_delay;
+
+	hc_delay = max_t(u32, DIV_ROUND_UP(delay, T_CK), 2) - 2;
+	writel(hostcmd1, &ctrl->cmd10[cmd_idx]);
+	writel((hostcmd2 & 0x7ff) | (hc_delay << 11), &ctrl->cmd20[cmd_idx]);
+}
+
+/* init DDR2 Controller */
+void ddr2_ctrl_init(void)
+{
+	u32 wr2prech, rd2prech, wr2rd, wr2rd_cs;
+	u32 ras2ras, ras2cas, prech2ras, temp;
+	const struct ddr2_arbiter_params *arb_params;
+	struct ddr2_ctrl_regs *ctrl;
+
+	ctrl = ioremap(PIC32_DDR2C_BASE, sizeof(*ctrl));
+
+	/* PIC32 DDR2 controller always work in HALF_RATE */
+	writel(HALF_RATE_MODE, &ctrl->memwidth);
+
+	/* Set arbiter configuration per target */
+	arb_params = board_get_ddr_arbiter_params();
+	ddr_set_arbiter(ctrl, arb_params);
+
+	/* Address Configuration, model {CS, ROW, BA, COL} */
+	writel((ROW_ADDR_RSHIFT | (BA_RSHFT << 8) | (CS_ADDR_RSHIFT << 16) |
+	       (COL_HI_RSHFT << 24) | (SB_PRI << 29)  |
+	       (EN_AUTO_PRECH << 30)), &ctrl->memcfg0);
+
+	writel(ROW_ADDR_MASK, &ctrl->memcfg1);
+	writel(COL_HI_MASK, &ctrl->memcfg2);
+	writel(COL_LO_MASK, &ctrl->memcfg3);
+	writel(BA_MASK | (CS_ADDR_MASK << 8), &ctrl->memcfg4);
+
+	/* Refresh Config */
+	writel(REFCNT_CLK(DIV_ROUND_UP(T_RFI, T_CK_CTRL) - 2) |
+	       REFDLY_CLK(DIV_ROUND_UP(T_RFC_MIN, T_CK_CTRL) - 2) |
+	       MAX_PEND_REF(7),
+	       &ctrl->refcfg);
+
+	/* Power Config */
+	writel(ECC_EN(0) | ERR_CORR_EN(0) | EN_AUTO_PWR_DN(0) |
+	       EN_AUTO_SELF_REF(3) | PWR_DN_DLY(8) |
+	       SELF_REF_DLY(17) | PRECH_PWR_DN_ONLY(0),
+	       &ctrl->pwrcfg);
+
+	/* Delay Config */
+	wr2rd = max_t(u32, DIV_ROUND_UP(T_WTR, T_CK_CTRL),
+		      DIV_ROUND_UP(T_WTR_TCK, 2)) + WL + BL;
+	wr2rd_cs = max_t(u32, wr2rd - 1, 3);
+	wr2prech = DIV_ROUND_UP(T_WR, T_CK_CTRL) + WL + BL;
+	rd2prech = max_t(u32, DIV_ROUND_UP(T_RTP, T_CK_CTRL),
+			 DIV_ROUND_UP(T_RTP_TCK, 2)) + BL - 2;
+	ras2ras = max_t(u32, DIV_ROUND_UP(T_RRD, T_CK_CTRL),
+			DIV_ROUND_UP(T_RRD_TCK, 2)) - 1;
+	ras2cas = DIV_ROUND_UP(T_RCD, T_CK_CTRL) - 1;
+	prech2ras = DIV_ROUND_UP(T_RP, T_CK_CTRL) - 1;
+
+	writel(((wr2rd & 0x0f) |
+	       ((wr2rd_cs & 0x0f) << 4) |
+	       ((BL - 1) << 8) |
+	       (BL << 12) |
+	       ((BL - 1) << 16) |
+	       ((BL - 1) << 20) |
+	       ((BL + 2) << 24) |
+	       ((RL - WL + 3) << 28)), &ctrl->dlycfg0);
+
+	writel(((T_CKE_TCK - 1) |
+	       (((DIV_ROUND_UP(T_DLLK, 2) - 2) & 0xff) << 8) |
+	       ((T_CKE_TCK - 1) << 16) |
+	       ((max_t(u32, T_XP_TCK, T_CKE_TCK) - 1) << 20) |
+	       ((wr2prech >> 4) << 26) |
+	       ((wr2rd >> 4) << 27) |
+	       ((wr2rd_cs >> 4) << 28) |
+	       (((RL + 5) >> 4) << 29) |
+	       ((DIV_ROUND_UP(T_DLLK, 2) >> 8) << 30)), &ctrl->dlycfg1);
+
+	writel((DIV_ROUND_UP(T_RP, T_CK_CTRL) |
+	       (rd2prech << 8) |
+	       ((wr2prech & 0x0f) << 12) |
+	       (ras2ras << 16) |
+	       (ras2cas << 20) |
+	       (prech2ras << 24) |
+	       ((RL + 3) << 28)), &ctrl->dlycfg2);
+
+	writel(((DIV_ROUND_UP(T_RAS_MIN, T_CK_CTRL) - 1) |
+	       ((DIV_ROUND_UP(T_RC, T_CK_CTRL) - 1) << 8) |
+	       ((DIV_ROUND_UP(T_FAW, T_CK_CTRL) - 1) << 16)),
+	       &ctrl->dlycfg3);
+
+	/* ODT Config */
+	writel(0x0, &ctrl->odtcfg);
+	writel(BIT(16), &ctrl->odtencfg);
+	writel(ODTRDLY(RL - 3) | ODTWDLY(WL - 3) | ODTRLEN(2) | ODTWLEN(3),
+	       &ctrl->odtcfg);
+
+	/* Transfer Configuration */
+	writel(NXTDATRQDLY(2) | NXDATAVDLY(4) | RDATENDLY(2) |
+	       MAX_BURST(3) | (7 << 28) | BIG_ENDIAN(0),
+	       &ctrl->xfercfg);
+
+	/* DRAM Initialization */
+	/* CKE high after reset and wait 400 nsec */
+	host_load_cmd(ctrl, 0, 0, IDLE_NOP, 400000);
+
+	/* issue precharge all command */
+	host_load_cmd(ctrl, 1, 0x04, PRECH_ALL_CMD, T_RP + T_CK);
+
+	/* initialize EMR2 */
+	host_load_cmd(ctrl, 2, 0x200, LOAD_MODE_CMD, T_MRD_TCK * T_CK);
+
+	/* initialize EMR3 */
+	host_load_cmd(ctrl, 3, 0x300, LOAD_MODE_CMD, T_MRD_TCK * T_CK);
+
+	/*
+	 * RDQS disable, DQSB enable, OCD exit, 150 ohm termination,
+	 * AL=0, DLL enable
+	 */
+	host_load_cmd(ctrl, 4, 0x100,
+		      LOAD_MODE_CMD | (0x40 << 24), T_MRD_TCK * T_CK);
+	/*
+	 * PD fast exit, WR REC = T_WR in clocks -1,
+	 * DLL reset, CAS = RL, burst = 4
+	 */
+	temp = ((DIV_ROUND_UP(T_WR, T_CK) - 1) << 1) | 1;
+	host_load_cmd(ctrl, 5, temp, LOAD_MODE_CMD | (RL << 28) | (2 << 24),
+		      T_MRD_TCK * T_CK);
+
+	/* issue precharge all command */
+	host_load_cmd(ctrl, 6, 4, PRECH_ALL_CMD, T_RP + T_CK);
+
+	/* issue refresh command */
+	host_load_cmd(ctrl, 7, 0, REF_CMD, T_RFC_MIN);
+
+	/* issue refresh command */
+	host_load_cmd(ctrl, 8, 0, REF_CMD, T_RFC_MIN);
+
+	/* Mode register programming as before without DLL reset */
+	host_load_cmd(ctrl, 9, temp, LOAD_MODE_CMD | (RL << 28) | (3 << 24),
+		      T_MRD_TCK * T_CK);
+
+	/* extended mode register same as before with OCD default */
+	host_load_cmd(ctrl, 10, 0x103, LOAD_MODE_CMD | (0xc << 24),
+		      T_MRD_TCK * T_CK);
+
+	/* extended mode register same as before with OCD exit */
+	host_load_cmd(ctrl, 11, 0x100, LOAD_MODE_CMD | (0x4 << 28),
+		      140 * T_CK);
+
+	writel(CMD_VALID | NUMHOSTCMD(11), &ctrl->cmdissue);
+
+	/* start memory initialization */
+	writel(INIT_START, &ctrl->memcon);
+
+	/* wait for all host cmds to be transmitted */
+	wait_for_bit(__func__, &ctrl->cmdissue, CMD_VALID, false,
+		     CONFIG_SYS_HZ, false);
+
+	/* inform all cmds issued, ready for normal operation */
+	writel(INIT_START | INIT_DONE, &ctrl->memcon);
+
+	/* perform phy caliberation */
+	if (ddr2_phy_calib_start())
+		printf("ddr2: phy calib failed\n");
+}
+
+phys_size_t ddr2_calculate_size(void)
+{
+	u32 temp;
+
+	temp = 1 << (COL_BITS + BA_BITS + ROW_BITS);
+	/* 16-bit data width between controller and DIMM */
+	temp = temp * CS_BITS * (16 / 8);
+	return (phys_size_t)temp;
+}

drivers/ddr/microchip/ddr2_regs.h

@@ -0,0 +1,148 @@
+/*
+ * (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ */
+
+#ifndef __MICROCHIP_DDR2_REGS_H
+#define __MICROCHIP_DDR2_REGS_H
+
+#include <linux/bitops.h>
+
+/* DDR2 Controller */
+struct ddr2_ctrl_regs {
+	u32 tsel;
+	u32 minlim;
+	u32 reqprd;
+	u32 mincmd;
+	u32 memcon;
+	u32 memcfg0;
+	u32 memcfg1;
+	u32 memcfg2;
+	u32 memcfg3;
+	u32 memcfg4;
+	u32 refcfg;
+	u32 pwrcfg;
+	u32 dlycfg0;
+	u32 dlycfg1;
+	u32 dlycfg2;
+	u32 dlycfg3;
+	u32 odtcfg;
+	u32 xfercfg;
+	u32 cmdissue;
+	u32 odtencfg;
+	u32 memwidth;
+	u32 unused[11];
+	u32 cmd10[16];
+	u32 cmd20[16];
+};
+
+/* Arbiter Config */
+#define MIN_LIM_WIDTH		5
+#define RQST_PERIOD_WIDTH	8
+#define MIN_CMDACPT_WIDTH	8
+
+/* Refresh Config */
+#define REFCNT_CLK(x)		(x)
+#define REFDLY_CLK(x)		((x) << 16)
+#define MAX_PEND_REF(x)		((x) << 24)
+
+/* Power Config */
+#define PRECH_PWR_DN_ONLY(x)	((x) << 22)
+#define SELF_REF_DLY(x)		((x) << 12)
+#define PWR_DN_DLY(x)		((x) << 4)
+#define EN_AUTO_SELF_REF(x)	((x) << 3)
+#define EN_AUTO_PWR_DN(x)	((x) << 2)
+#define ERR_CORR_EN(x)		((x) << 1)
+#define ECC_EN(x)		(x)
+
+/* Memory Width */
+#define HALF_RATE_MODE		BIT(3)
+
+/* Delay Config */
+#define ODTWLEN(x)	((x) << 20)
+#define ODTRLEN(x)	((x) << 16)
+#define ODTWDLY(x)	((x) << 12)
+#define ODTRDLY(x)	((x) << 8)
+
+/* Xfer Config */
+#define BIG_ENDIAN(x)	((x) << 31)
+#define MAX_BURST(x)	((x) << 24)
+#define RDATENDLY(x)	((x) << 16)
+#define NXDATAVDLY(x)	((x) << 4)
+#define NXTDATRQDLY(x)	((x) << 0)
+
+/* Host Commands */
+#define IDLE_NOP	0x00ffffff
+#define PRECH_ALL_CMD	0x00fff401
+#define REF_CMD		0x00fff801
+#define LOAD_MODE_CMD	0x00fff001
+#define CKE_LOW		0x00ffeffe
+
+#define NUM_HOST_CMDS	12
+
+/* Host CMD Issue */
+#define CMD_VALID	BIT(4)
+#define NUMHOSTCMD(x)	(x)
+
+/* Memory Control */
+#define INIT_DONE	BIT(1)
+#define INIT_START	BIT(0)
+
+/* Address Control */
+#define EN_AUTO_PRECH		0
+#define SB_PRI			1
+
+/* DDR2 Phy Register */
+struct ddr2_phy_regs {
+	u32 scl_start;
+	u32 unused1[2];
+	u32 scl_latency;
+	u32 unused2[2];
+	u32 scl_config_1;
+	u32 scl_config_2;
+	u32 pad_ctrl;
+	u32 dll_recalib;
+};
+
+/* PHY PAD CONTROL */
+#define ODT_SEL			BIT(0)
+#define ODT_EN			BIT(1)
+#define DRIVE_SEL(x)		((x) << 2)
+#define ODT_PULLDOWN(x)		((x) << 4)
+#define ODT_PULLUP(x)		((x) << 6)
+#define EXTRA_OEN_CLK(x)	((x) << 8)
+#define NOEXT_DLL		BIT(9)
+#define DLR_DFT_WRCMD		BIT(13)
+#define HALF_RATE		BIT(14)
+#define DRVSTR_PFET(x)		((x) << 16)
+#define DRVSTR_NFET(x)		((x) << 20)
+#define RCVR_EN			BIT(28)
+#define PREAMBLE_DLY(x)		((x) << 29)
+
+/* PHY DLL RECALIBRATE */
+#define RECALIB_CNT(x)		((x) << 8)
+#define DISABLE_RECALIB(x)	((x) << 26)
+#define DELAY_START_VAL(x)	((x) << 28)
+
+/* PHY SCL CONFIG1 */
+#define SCL_BURST8		BIT(0)
+#define SCL_DDR_CONNECTED		BIT(1)
+#define SCL_RCAS_LAT(x)		((x) << 4)
+#define SCL_ODTCSWW		BIT(24)
+
+/* PHY SCL CONFIG2 */
+#define SCL_CSEN		BIT(0)
+#define SCL_WCAS_LAT(x)		((x) << 8)
+
+/* PHY SCL Latency */
+#define SCL_CAPCLKDLY(x)	((x) << 0)
+#define SCL_DDRCLKDLY(x)	((x) << 4)
+
+/* PHY SCL START */
+#define SCL_START		BIT(28)
+#define SCL_EN			BIT(26)
+#define SCL_LUBPASS		(BIT(1) | BIT(0))
+
+#endif	/* __MICROCHIP_DDR2_REGS_H */

drivers/ddr/microchip/ddr2_timing.h

@@ -0,0 +1,65 @@
+/*
+ * (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ */
+
+#ifndef __MICROCHIP_DDR2_TIMING_H
+#define __MICROCHIP_DDR2_TIMING_H
+
+/* MPLL freq is 400MHz */
+#define T_CK		2500    /* 2500 psec */
+#define T_CK_CTRL	(T_CK * 2)
+
+/* Burst length in cycles */
+#define BL		2
+/* default CAS latency for all speed grades */
+#define RL		5
+/* default write latency for all speed grades = CL-1 */
+#define WL		4
+
+/* From Micron MT47H64M16HR-3 data sheet */
+#define T_RFC_MIN	127500	/* psec */
+#define T_WR		15000	/* psec */
+#define T_RP		12500	/* psec */
+#define T_RCD		12500	/* psec */
+#define T_RRD		7500	/* psec */
+/* T_RRD_TCK is minimum of 2 clk periods, regardless of freq */
+#define T_RRD_TCK	2
+#define T_WTR		7500	/* psec */
+/* T_WTR_TCK is minimum of 2 clk periods, regardless of freq */
+#define T_WTR_TCK	2
+#define T_RTP		7500	/* psec */
+#define T_RTP_TCK	(BL / 2)
+#define T_XP_TCK	2	/* clocks */
+#define T_CKE_TCK	3	/* clocks */
+#define T_XSNR		(T_RFC_MIN + 10000) /* psec */
+#define T_DLLK		200     /* clocks */
+#define T_RAS_MIN	45000   /* psec */
+#define T_RC		57500   /* psec */
+#define T_FAW		35000   /* psec */
+#define T_MRD_TCK	2       /* clocks */
+#define T_RFI		7800000 /* psec */
+
+/* DDR Addressing */
+#define COL_BITS	10
+#define BA_BITS		3
+#define ROW_BITS	13
+#define CS_BITS		1
+
+/* DDR Addressing scheme: {CS, ROW, BA, COL} */
+#define COL_HI_RSHFT	0
+#define COL_HI_MASK	0
+#define COL_LO_MASK	((1 << COL_BITS) - 1)
+
+#define BA_RSHFT	COL_BITS
+#define BA_MASK		((1 << BA_BITS) - 1)
+
+#define ROW_ADDR_RSHIFT	(BA_RSHFT + BA_BITS)
+#define ROW_ADDR_MASK	((1 << ROW_BITS) - 1)
+
+#define CS_ADDR_RSHIFT	0
+#define CS_ADDR_MASK	0
+
+#endif	/* __MICROCHIP_DDR2_TIMING_H */

drivers/gpio/Kconfig

@@ -83,4 +83,11 @@ config VYBRID_GPIO
 	help
 	  Say yes here to support Vybrid vf610 GPIOs.
 
+config PIC32_GPIO
+	bool "Microchip PIC32 GPIO driver"
+	depends on DM_GPIO && MACH_PIC32
+	default y
+	help
+	  Say yes here to support Microchip PIC32 GPIOs.
+
 endmenu

drivers/gpio/Makefile

@@ -46,4 +46,4 @@ obj-$(CONFIG_STM32_GPIO)	+= stm32_gpio.o
 obj-$(CONFIG_ZYNQ_GPIO)		+= zynq_gpio.o
 obj-$(CONFIG_VYBRID_GPIO)	+= vybrid_gpio.o
 obj-$(CONFIG_HIKEY_GPIO)	+= hi6220_gpio.o
-
+obj-$(CONFIG_PIC32_GPIO)	+= pic32_gpio.o

drivers/gpio/pic32_gpio.c

@@ -0,0 +1,174 @@
+/*
+ * Copyright (c) 2015 Microchip Technology Inc
+ * Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <malloc.h>
+#include <asm/io.h>
+#include <asm/gpio.h>
+#include <linux/compat.h>
+#include <dt-bindings/gpio/gpio.h>
+#include <mach/pic32.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* Peripheral Pin Control */
+struct pic32_reg_port {
+	struct pic32_reg_atomic ansel;
+	struct pic32_reg_atomic tris;
+	struct pic32_reg_atomic port;
+	struct pic32_reg_atomic lat;
+	struct pic32_reg_atomic open_drain;
+	struct pic32_reg_atomic cnpu;
+	struct pic32_reg_atomic cnpd;
+	struct pic32_reg_atomic cncon;
+};
+
+enum {
+	MICROCHIP_GPIO_DIR_OUT,
+	MICROCHIP_GPIO_DIR_IN,
+	MICROCHIP_GPIOS_PER_BANK = 16,
+};
+
+struct pic32_gpio_priv {
+	struct pic32_reg_port *regs;
+	char name[2];
+};
+
+static int pic32_gpio_get_value(struct udevice *dev, unsigned offset)
+{
+	struct pic32_gpio_priv *priv = dev_get_priv(dev);
+
+	return !!(readl(&priv->regs->port.raw) & BIT(offset));
+}
+
+static int pic32_gpio_set_value(struct udevice *dev, unsigned offset,
+				int value)
+{
+	struct pic32_gpio_priv *priv = dev_get_priv(dev);
+	int mask = BIT(offset);
+
+	if (value)
+		writel(mask, &priv->regs->port.set);
+	else
+		writel(mask, &priv->regs->port.clr);
+
+	return 0;
+}
+
+static int pic32_gpio_direction(struct udevice *dev, unsigned offset)
+{
+	struct pic32_gpio_priv *priv = dev_get_priv(dev);
+
+	/* pin in analog mode ? */
+	if (readl(&priv->regs->ansel.raw) & BIT(offset))
+		return -EPERM;
+
+	if (readl(&priv->regs->tris.raw) & BIT(offset))
+		return MICROCHIP_GPIO_DIR_IN;
+	else
+		return MICROCHIP_GPIO_DIR_OUT;
+}
+
+static int pic32_gpio_direction_input(struct udevice *dev, unsigned offset)
+{
+	struct pic32_gpio_priv *priv = dev_get_priv(dev);
+	int mask = BIT(offset);
+
+	writel(mask, &priv->regs->ansel.clr);
+	writel(mask, &priv->regs->tris.set);
+
+	return 0;
+}
+
+static int pic32_gpio_direction_output(struct udevice *dev,
+				       unsigned offset, int value)
+{
+	struct pic32_gpio_priv *priv = dev_get_priv(dev);
+	int mask = BIT(offset);
+
+	writel(mask, &priv->regs->ansel.clr);
+	writel(mask, &priv->regs->tris.clr);
+
+	pic32_gpio_set_value(dev, offset, value);
+	return 0;
+}
+
+static int pic32_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
+			    struct fdtdec_phandle_args *args)
+{
+	desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;
+
+	return 0;
+}
+
+static int pic32_gpio_get_function(struct udevice *dev, unsigned offset)
+{
+	int ret = GPIOF_UNUSED;
+
+	switch (pic32_gpio_direction(dev, offset)) {
+	case MICROCHIP_GPIO_DIR_OUT:
+		ret = GPIOF_OUTPUT;
+		break;
+	case MICROCHIP_GPIO_DIR_IN:
+		ret = GPIOF_INPUT;
+		break;
+	default:
+		ret = GPIOF_UNUSED;
+		break;
+	}
+	return ret;
+}
+
+static const struct dm_gpio_ops gpio_pic32_ops = {
+	.direction_input	= pic32_gpio_direction_input,
+	.direction_output	= pic32_gpio_direction_output,
+	.get_value		= pic32_gpio_get_value,
+	.set_value		= pic32_gpio_set_value,
+	.get_function		= pic32_gpio_get_function,
+	.xlate			= pic32_gpio_xlate,
+};
+
+static int pic32_gpio_probe(struct udevice *dev)
+{
+	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+	struct pic32_gpio_priv *priv = dev_get_priv(dev);
+	fdt_addr_t addr;
+	fdt_size_t size;
+	char *end;
+	int bank;
+
+	addr = fdtdec_get_addr_size(gd->fdt_blob, dev->of_offset, "reg", &size);
+	if (addr == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	priv->regs = ioremap(addr, size);
+
+	uc_priv->gpio_count = MICROCHIP_GPIOS_PER_BANK;
+	/* extract bank name */
+	end = strrchr(dev->name, '@');
+	bank = trailing_strtoln(dev->name, end);
+	priv->name[0] = 'A' + bank;
+	uc_priv->bank_name = priv->name;
+
+	return 0;
+}
+
+static const struct udevice_id pic32_gpio_ids[] = {
+	{ .compatible = "microchip,pic32mzda-gpio" },
+	{ }
+};
+
+U_BOOT_DRIVER(gpio_pic32) = {
+	.name		= "gpio_pic32",
+	.id		= UCLASS_GPIO,
+	.of_match	= pic32_gpio_ids,
+	.ops		= &gpio_pic32_ops,
+	.probe		= pic32_gpio_probe,
+	.priv_auto_alloc_size	= sizeof(struct pic32_gpio_priv),
+};

drivers/mmc/Kconfig

@@ -31,4 +31,10 @@ config SH_SDHI
 	help
 	  Support for the on-chip SDHI host controller on SuperH/Renesas ARM SoCs platform
 
+config PIC32_SDHCI
+	bool "Microchip PIC32 on-chip SDHCI support"
+	depends on DM_MMC && MACH_PIC32
+	help
+	  Support for Microchip PIC32 SDHCI controller.
+
 endmenu

drivers/mmc/Makefile

@@ -48,4 +48,4 @@ obj-$(CONFIG_SPL_MMC_BOOT) += fsl_esdhc_spl.o
 else
 obj-$(CONFIG_GENERIC_MMC) += mmc_write.o
 endif
-
+obj-$(CONFIG_PIC32_SDHCI) += pic32_sdhci.o

drivers/mmc/pic32_sdhci.c

@@ -0,0 +1,58 @@
+/*
+ * Support of SDHCI for Microchip PIC32 SoC.
+ *
+ * Copyright (C) 2015 Microchip Technology Inc.
+ * Andrei Pistirica <andrei.pistirica@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <dm.h>
+#include <common.h>
+#include <sdhci.h>
+#include <asm/errno.h>
+#include <mach/pic32.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int pic32_sdhci_probe(struct udevice *dev)
+{
+	struct sdhci_host *host = dev_get_priv(dev);
+	const void *fdt = gd->fdt_blob;
+	u32 f_min_max[2];
+	fdt_addr_t addr;
+	fdt_size_t size;
+	int ret;
+
+	addr = fdtdec_get_addr_size(fdt, dev->of_offset, "reg", &size);
+	if (addr == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	host->ioaddr	= ioremap(addr, size);
+	host->name	= (char *)dev->name;
+	host->quirks	= SDHCI_QUIRK_NO_HISPD_BIT | SDHCI_QUIRK_NO_CD;
+	host->bus_width	= fdtdec_get_int(gd->fdt_blob, dev->of_offset,
+					"bus-width", 4);
+
+	ret = fdtdec_get_int_array(gd->fdt_blob, dev->of_offset,
+				   "clock-freq-min-max", f_min_max, 2);
+	if (ret) {
+		printf("sdhci: clock-freq-min-max not found\n");
+		return ret;
+	}
+
+	return add_sdhci(host, f_min_max[1], f_min_max[0]);
+}
+
+static const struct udevice_id pic32_sdhci_ids[] = {
+	{ .compatible = "microchip,pic32mzda-sdhci" },
+	{ }
+};
+
+U_BOOT_DRIVER(pic32_sdhci_drv) = {
+	.name			= "pic32_sdhci",
+	.id			= UCLASS_MMC,
+	.of_match		= pic32_sdhci_ids,
+	.probe			= pic32_sdhci_probe,
+	.priv_auto_alloc_size	= sizeof(struct sdhci_host),
+};

drivers/mmc/sdhci.c

@@ -443,6 +443,12 @@ static int sdhci_init(struct mmc *mmc)
 	sdhci_set_power(host, fls(mmc->cfg->voltages) - 1);
 
 	if (host->quirks & SDHCI_QUIRK_NO_CD) {
+#if defined(CONFIG_PIC32_SDHCI)
+		/* PIC32 SDHCI CD errata:
+		 * - set CD_TEST and clear CD_TEST_INS bit
+		 */
+		sdhci_writeb(host, SDHCI_CTRL_CD_TEST, SDHCI_HOST_CONTROL);
+#else
 		unsigned int status;
 
 		sdhci_writeb(host, SDHCI_CTRL_CD_TEST_INS | SDHCI_CTRL_CD_TEST,
@@ -453,6 +459,7 @@ static int sdhci_init(struct mmc *mmc)
 		    (!(status & SDHCI_CARD_STATE_STABLE)) ||
 		    (!(status & SDHCI_CARD_DETECT_PIN_LEVEL)))
 			status = sdhci_readl(host, SDHCI_PRESENT_STATE);
+#endif
 	}
 
 	/* Enable only interrupts served by the SD controller */

drivers/net/Kconfig

@@ -125,4 +125,12 @@ config ZYNQ_GEM
 	help
 	  This MAC is present in Xilinx Zynq and ZynqMP SoCs.
 
+config PIC32_ETH
+	bool "Microchip PIC32 Ethernet Support"
+	depends on DM_ETH && MACH_PIC32
+	select PHYLIB
+	help
+	  This driver implements 10/100 Mbps Ethernet and MAC layer for
+	  Microchip PIC32 microcontrollers.
+
 endif # NETDEVICES

drivers/net/Makefile

@@ -72,3 +72,4 @@ obj-$(CONFIG_FSL_MC_ENET) += fsl-mc/
 obj-$(CONFIG_FSL_MC_ENET) += ldpaa_eth/
 obj-$(CONFIG_FSL_MEMAC) += fm/memac_phy.o
 obj-$(CONFIG_VSC9953) += vsc9953.o
+obj-$(CONFIG_PIC32_ETH) += pic32_mdio.o pic32_eth.o

drivers/net/phy/smsc.c

@@ -69,11 +69,21 @@ static struct phy_driver lan8710_driver = {
 	.shutdown = &genphy_shutdown,
 };
 
+static struct phy_driver lan8740_driver = {
+	.name = "SMSC LAN8740",
+	.uid = 0x0007c110,
+	.mask = 0xffff0,
+	.features = PHY_BASIC_FEATURES,
+	.config = &genphy_config_aneg,
+	.startup = &genphy_startup,
+	.shutdown = &genphy_shutdown,
+};
 int phy_smsc_init(void)
 {
 	phy_register(&lan8710_driver);
 	phy_register(&lan911x_driver);
 	phy_register(&lan8700_driver);
+	phy_register(&lan8740_driver);
 
 	return 0;
 }

drivers/net/pic32_eth.c

@@ -0,0 +1,605 @@
+/*
+ * (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ */
+#include <common.h>
+#include <errno.h>
+#include <dm.h>
+#include <net.h>
+#include <miiphy.h>
+#include <console.h>
+#include <wait_bit.h>
+#include <asm/gpio.h>
+
+#include "pic32_eth.h"
+
+#define MAX_RX_BUF_SIZE		1536
+#define MAX_RX_DESCR		PKTBUFSRX
+#define MAX_TX_DESCR		2
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct pic32eth_dev {
+	struct eth_dma_desc rxd_ring[MAX_RX_DESCR];
+	struct eth_dma_desc txd_ring[MAX_TX_DESCR];
+	u32 rxd_idx; /* index of RX desc to read */
+	/* regs */
+	struct pic32_ectl_regs *ectl_regs;
+	struct pic32_emac_regs *emac_regs;
+	/* Phy */
+	struct phy_device *phydev;
+	phy_interface_t phyif;
+	u32 phy_addr;
+	struct gpio_desc rst_gpio;
+};
+
+void __weak board_netphy_reset(void *dev)
+{
+	struct pic32eth_dev *priv = dev;
+
+	if (!dm_gpio_is_valid(&priv->rst_gpio))
+		return;
+
+	/* phy reset */
+	dm_gpio_set_value(&priv->rst_gpio, 0);
+	udelay(300);
+	dm_gpio_set_value(&priv->rst_gpio, 1);
+	udelay(300);
+}
+
+/* Initialize mii(MDIO) interface, discover which PHY is
+ * attached to the device, and configure it properly.
+ */
+static int pic32_mii_init(struct pic32eth_dev *priv)
+{
+	struct pic32_ectl_regs *ectl_p = priv->ectl_regs;
+	struct pic32_emac_regs *emac_p = priv->emac_regs;
+
+	/* board phy reset */
+	board_netphy_reset(priv);
+
+	/* disable RX, TX & all transactions */
+	writel(ETHCON_ON | ETHCON_TXRTS | ETHCON_RXEN, &ectl_p->con1.clr);
+
+	/* wait till busy */
+	wait_for_bit(__func__, &ectl_p->stat.raw, ETHSTAT_BUSY, false,
+		     CONFIG_SYS_HZ, false);
+
+	/* turn controller ON to access PHY over MII */
+	writel(ETHCON_ON, &ectl_p->con1.set);
+
+	mdelay(10);
+
+	/* reset MAC */
+	writel(EMAC_SOFTRESET, &emac_p->cfg1.set); /* reset assert */
+	mdelay(10);
+	writel(EMAC_SOFTRESET, &emac_p->cfg1.clr); /* reset deassert */
+
+	/* initialize MDIO/MII */
+	if (priv->phyif == PHY_INTERFACE_MODE_RMII) {
+		writel(EMAC_RMII_RESET, &emac_p->supp.set);
+		mdelay(10);
+		writel(EMAC_RMII_RESET, &emac_p->supp.clr);
+	}
+
+	return pic32_mdio_init(PIC32_MDIO_NAME, (ulong)&emac_p->mii);
+}
+
+static int pic32_phy_init(struct pic32eth_dev *priv, struct udevice *dev)
+{
+	struct mii_dev *mii;
+
+	mii = miiphy_get_dev_by_name(PIC32_MDIO_NAME);
+
+	/* find & connect PHY */
+	priv->phydev = phy_connect(mii, priv->phy_addr,
+				   dev, priv->phyif);
+	if (!priv->phydev) {
+		printf("%s: %s: Error, PHY connect\n", __FILE__, __func__);
+		return 0;
+	}
+
+	/* Wait for phy to complete reset */
+	mdelay(10);
+
+	/* configure supported modes */
+	priv->phydev->supported = SUPPORTED_10baseT_Half |
+				  SUPPORTED_10baseT_Full |
+				  SUPPORTED_100baseT_Half |
+				  SUPPORTED_100baseT_Full |
+				  SUPPORTED_Autoneg;
+
+	priv->phydev->advertising = ADVERTISED_10baseT_Half |
+				    ADVERTISED_10baseT_Full |
+				    ADVERTISED_100baseT_Half |
+				    ADVERTISED_100baseT_Full |
+				    ADVERTISED_Autoneg;
+
+	priv->phydev->autoneg = AUTONEG_ENABLE;
+
+	return 0;
+}
+
+/* Configure MAC based on negotiated speed and duplex
+ * reported by PHY.
+ */
+static int pic32_mac_adjust_link(struct pic32eth_dev *priv)
+{
+	struct phy_device *phydev = priv->phydev;
+	struct pic32_emac_regs *emac_p = priv->emac_regs;
+
+	if (!phydev->link) {
+		printf("%s: No link.\n", phydev->dev->name);
+		return -EINVAL;
+	}
+
+	if (phydev->duplex) {
+		writel(EMAC_FULLDUP, &emac_p->cfg2.set);
+		writel(FULLDUP_GAP_TIME, &emac_p->ipgt.raw);
+	} else {
+		writel(EMAC_FULLDUP, &emac_p->cfg2.clr);
+		writel(HALFDUP_GAP_TIME, &emac_p->ipgt.raw);
+	}
+
+	switch (phydev->speed) {
+	case SPEED_100:
+		writel(EMAC_RMII_SPD100, &emac_p->supp.set);
+		break;
+	case SPEED_10:
+		writel(EMAC_RMII_SPD100, &emac_p->supp.clr);
+		break;
+	default:
+		printf("%s: Speed was bad\n", phydev->dev->name);
+		return -EINVAL;
+	}
+
+	printf("pic32eth: PHY is %s with %dbase%s, %s\n",
+	       phydev->drv->name, phydev->speed,
+	       (phydev->port == PORT_TP) ? "T" : "X",
+	       (phydev->duplex) ? "full" : "half");
+
+	return 0;
+}
+
+static void pic32_mac_init(struct pic32eth_dev *priv, u8 *macaddr)
+{
+	struct pic32_emac_regs *emac_p = priv->emac_regs;
+	u32 stat = 0, v;
+	u64 expire;
+
+	v = EMAC_TXPAUSE | EMAC_RXPAUSE | EMAC_RXENABLE;
+	writel(v, &emac_p->cfg1.raw);
+
+	v = EMAC_EXCESS | EMAC_AUTOPAD | EMAC_PADENABLE |
+	    EMAC_CRCENABLE | EMAC_LENGTHCK | EMAC_FULLDUP;
+	writel(v, &emac_p->cfg2.raw);
+
+	/* recommended back-to-back inter-packet gap for 10 Mbps half duplex */
+	writel(HALFDUP_GAP_TIME, &emac_p->ipgt.raw);
+
+	/* recommended non-back-to-back interpacket gap is 0xc12 */
+	writel(0xc12, &emac_p->ipgr.raw);
+
+	/* recommended collision window retry limit is 0x370F */
+	writel(0x370f, &emac_p->clrt.raw);
+
+	/* set maximum frame length: allow VLAN tagged frame */
+	writel(0x600, &emac_p->maxf.raw);
+
+	/* set the mac address */
+	writel(macaddr[0] | (macaddr[1] << 8), &emac_p->sa2.raw);
+	writel(macaddr[2] | (macaddr[3] << 8), &emac_p->sa1.raw);
+	writel(macaddr[4] | (macaddr[5] << 8), &emac_p->sa0.raw);
+
+	/* default, enable 10 Mbps operation */
+	writel(EMAC_RMII_SPD100, &emac_p->supp.clr);
+
+	/* wait until link status UP or deadline elapsed */
+	expire = get_ticks() + get_tbclk() * 2;
+	for (; get_ticks() < expire;) {
+		stat = phy_read(priv->phydev, priv->phy_addr, MII_BMSR);
+		if (stat & BMSR_LSTATUS)
+			break;
+	}
+
+	if (!(stat & BMSR_LSTATUS))
+		printf("MAC: Link is DOWN!\n");
+
+	/* delay to stabilize before any tx/rx */
+	mdelay(10);
+}
+
+static void pic32_mac_reset(struct pic32eth_dev *priv)
+{
+	struct pic32_emac_regs *emac_p = priv->emac_regs;
+	struct mii_dev *mii;
+
+	/* Reset MAC */
+	writel(EMAC_SOFTRESET, &emac_p->cfg1.raw);
+	mdelay(10);
+
+	/* clear reset */
+	writel(0, &emac_p->cfg1.raw);
+
+	/* Reset MII */
+	mii = priv->phydev->bus;
+	if (mii && mii->reset)
+		mii->reset(mii);
+}
+
+/* initializes the MAC and PHY, then establishes a link */
+static void pic32_ctrl_reset(struct pic32eth_dev *priv)
+{
+	struct pic32_ectl_regs *ectl_p = priv->ectl_regs;
+	u32 v;
+
+	/* disable RX, TX & any other transactions */
+	writel(ETHCON_ON | ETHCON_TXRTS | ETHCON_RXEN, &ectl_p->con1.clr);
+
+	/* wait till busy */
+	wait_for_bit(__func__, &ectl_p->stat.raw, ETHSTAT_BUSY, false,
+		     CONFIG_SYS_HZ, false);
+	/* decrement received buffcnt to zero. */
+	while (readl(&ectl_p->stat.raw) & ETHSTAT_BUFCNT)
+		writel(ETHCON_BUFCDEC, &ectl_p->con1.set);
+
+	/* clear any existing interrupt event */
+	writel(0xffffffff, &ectl_p->irq.clr);
+
+	/* clear RX/TX start address */
+	writel(0xffffffff, &ectl_p->txst.clr);
+	writel(0xffffffff, &ectl_p->rxst.clr);
+
+	/* clear the receive filters */
+	writel(0x00ff, &ectl_p->rxfc.clr);
+
+	/* set the receive filters
+	 * ETH_FILT_CRC_ERR_REJECT
+	 * ETH_FILT_RUNT_REJECT
+	 * ETH_FILT_UCAST_ACCEPT
+	 * ETH_FILT_MCAST_ACCEPT
+	 * ETH_FILT_BCAST_ACCEPT
+	 */
+	v = ETHRXFC_BCEN | ETHRXFC_MCEN | ETHRXFC_UCEN |
+	    ETHRXFC_RUNTEN | ETHRXFC_CRCOKEN;
+	writel(v, &ectl_p->rxfc.set);
+
+	/* turn controller ON to access PHY over MII */
+	writel(ETHCON_ON, &ectl_p->con1.set);
+}
+
+static void pic32_rx_desc_init(struct pic32eth_dev *priv)
+{
+	struct pic32_ectl_regs *ectl_p = priv->ectl_regs;
+	struct eth_dma_desc *rxd;
+	u32 idx, bufsz;
+
+	priv->rxd_idx = 0;
+	for (idx = 0; idx < MAX_RX_DESCR; idx++) {
+		rxd = &priv->rxd_ring[idx];
+
+		/* hw owned */
+		rxd->hdr = EDH_NPV | EDH_EOWN | EDH_STICKY;
+
+		/* packet buffer address */
+		rxd->data_buff = virt_to_phys(net_rx_packets[idx]);
+
+		/* link to next desc */
+		rxd->next_ed = virt_to_phys(rxd + 1);
+
+		/* reset status */
+		rxd->stat1 = 0;
+		rxd->stat2 = 0;
+
+		/* decrement bufcnt */
+		writel(ETHCON_BUFCDEC, &ectl_p->con1.set);
+	}
+
+	/* link last descr to beginning of list */
+	rxd->next_ed = virt_to_phys(&priv->rxd_ring[0]);
+
+	/* flush rx ring */
+	flush_dcache_range((ulong)priv->rxd_ring,
+			   (ulong)priv->rxd_ring + sizeof(priv->rxd_ring));
+
+	/* set rx desc-ring start address */
+	writel((ulong)virt_to_phys(&priv->rxd_ring[0]), &ectl_p->rxst.raw);
+
+	/* RX Buffer size */
+	bufsz = readl(&ectl_p->con2.raw);
+	bufsz &= ~(ETHCON_RXBUFSZ << ETHCON_RXBUFSZ_SHFT);
+	bufsz |= ((MAX_RX_BUF_SIZE / 16) << ETHCON_RXBUFSZ_SHFT);
+	writel(bufsz, &ectl_p->con2.raw);
+
+	/* enable the receiver in hardware which allows hardware
+	 * to DMA received pkts to the descriptor pointer address.
+	 */
+	writel(ETHCON_RXEN, &ectl_p->con1.set);
+}
+
+static int pic32_eth_start(struct udevice *dev)
+{
+	struct eth_pdata *pdata = dev_get_platdata(dev);
+	struct pic32eth_dev *priv = dev_get_priv(dev);
+
+	/* controller */
+	pic32_ctrl_reset(priv);
+
+	/* reset MAC */
+	pic32_mac_reset(priv);
+
+	/* configure PHY */
+	phy_config(priv->phydev);
+
+	/* initialize MAC */
+	pic32_mac_init(priv, &pdata->enetaddr[0]);
+
+	/* init RX descriptor; TX descriptors are handled in xmit */
+	pic32_rx_desc_init(priv);
+
+	/* Start up & update link status of PHY */
+	phy_startup(priv->phydev);
+
+	/* adjust mac with phy link status */
+	return pic32_mac_adjust_link(priv);
+}
+
+static void pic32_eth_stop(struct udevice *dev)
+{
+	struct pic32eth_dev *priv = dev_get_priv(dev);
+	struct pic32_ectl_regs *ectl_p = priv->ectl_regs;
+	struct pic32_emac_regs *emac_p = priv->emac_regs;
+
+	/* Reset the phy if the controller is enabled */
+	if (readl(&ectl_p->con1.raw) & ETHCON_ON)
+		phy_reset(priv->phydev);
+
+	/* Shut down the PHY */
+	phy_shutdown(priv->phydev);
+
+	/* Stop rx/tx */
+	writel(ETHCON_TXRTS | ETHCON_RXEN, &ectl_p->con1.clr);
+	mdelay(10);
+
+	/* reset MAC */
+	writel(EMAC_SOFTRESET, &emac_p->cfg1.raw);
+
+	/* clear reset */
+	writel(0, &emac_p->cfg1.raw);
+	mdelay(10);
+
+	/* disable controller */
+	writel(ETHCON_ON, &ectl_p->con1.clr);
+	mdelay(10);
+
+	/* wait until everything is down */
+	wait_for_bit(__func__, &ectl_p->stat.raw, ETHSTAT_BUSY, false,
+		     2 * CONFIG_SYS_HZ, false);
+
+	/* clear any existing interrupt event */
+	writel(0xffffffff, &ectl_p->irq.clr);
+}
+
+static int pic32_eth_send(struct udevice *dev, void *packet, int length)
+{
+	struct pic32eth_dev *priv = dev_get_priv(dev);
+	struct pic32_ectl_regs *ectl_p = priv->ectl_regs;
+	struct eth_dma_desc *txd;
+	u64 deadline;
+
+	txd = &priv->txd_ring[0];
+
+	/* set proper flags & length in descriptor header */
+	txd->hdr = EDH_SOP | EDH_EOP | EDH_EOWN | EDH_BCOUNT(length);
+
+	/* pass buffer address to hardware */
+	txd->data_buff = virt_to_phys(packet);
+
+	debug("%s: %d / .hdr %x, .data_buff %x, .stat %x, .nexted %x\n",
+	      __func__, __LINE__, txd->hdr, txd->data_buff, txd->stat2,
+	      txd->next_ed);
+
+	/* cache flush (packet) */
+	flush_dcache_range((ulong)packet, (ulong)packet + length);
+
+	/* cache flush (txd) */
+	flush_dcache_range((ulong)txd, (ulong)txd + sizeof(*txd));
+
+	/* pass descriptor table base to h/w */
+	writel(virt_to_phys(txd), &ectl_p->txst.raw);
+
+	/* ready to send enabled, hardware can now send the packet(s) */
+	writel(ETHCON_TXRTS | ETHCON_ON, &ectl_p->con1.set);
+
+	/* wait until tx has completed and h/w has released ownership
+	 * of the tx descriptor or timeout elapsed.
+	 */
+	deadline = get_ticks() + get_tbclk();
+	for (;;) {
+		/* check timeout */
+		if (get_ticks() > deadline)
+			return -ETIMEDOUT;
+
+		if (ctrlc())
+			return -EINTR;
+
+		/* tx completed ? */
+		if (readl(&ectl_p->con1.raw) & ETHCON_TXRTS) {
+			udelay(1);
+			continue;
+		}
+
+		/* h/w not released ownership yet? */
+		invalidate_dcache_range((ulong)txd, (ulong)txd + sizeof(*txd));
+		if (!(txd->hdr & EDH_EOWN))
+			break;
+	}
+
+	return 0;
+}
+
+static int pic32_eth_recv(struct udevice *dev, int flags, uchar **packetp)
+{
+	struct pic32eth_dev *priv = dev_get_priv(dev);
+	struct eth_dma_desc *rxd;
+	u32 idx = priv->rxd_idx;
+	u32 rx_count;
+
+	/* find the next ready to receive */
+	rxd = &priv->rxd_ring[idx];
+
+	invalidate_dcache_range((ulong)rxd, (ulong)rxd + sizeof(*rxd));
+	/* check if owned by MAC */
+	if (rxd->hdr & EDH_EOWN)
+		return -EAGAIN;
+
+	/* Sanity check on header: SOP and EOP  */
+	if ((rxd->hdr & (EDH_SOP | EDH_EOP)) != (EDH_SOP | EDH_EOP)) {
+		printf("%s: %s, rx pkt across multiple descr\n",
+		       __FILE__, __func__);
+		return 0;
+	}
+
+	debug("%s: %d /idx %i, hdr=%x, data_buff %x, stat %x, nexted %x\n",
+	      __func__, __LINE__, idx, rxd->hdr,
+	      rxd->data_buff, rxd->stat2, rxd->next_ed);
+
+	/* Sanity check on rx_stat: OK, CRC */
+	if (!RSV_RX_OK(rxd->stat2) || RSV_CRC_ERR(rxd->stat2)) {
+		debug("%s: %s: Error, rx problem detected\n",
+		      __FILE__, __func__);
+		return 0;
+	}
+
+	/* invalidate dcache */
+	rx_count = RSV_RX_COUNT(rxd->stat2);
+	invalidate_dcache_range((ulong)net_rx_packets[idx],
+				(ulong)net_rx_packets[idx] + rx_count);
+
+	/* Pass the packet to protocol layer */
+	*packetp = net_rx_packets[idx];
+
+	/* increment number of bytes rcvd (ignore CRC) */
+	return rx_count - 4;
+}
+
+static int pic32_eth_free_pkt(struct udevice *dev, uchar *packet, int length)
+{
+	struct pic32eth_dev *priv = dev_get_priv(dev);
+	struct pic32_ectl_regs *ectl_p = priv->ectl_regs;
+	struct eth_dma_desc *rxd;
+	int idx = priv->rxd_idx;
+
+	/* sanity check */
+	if (packet != net_rx_packets[idx]) {
+		printf("rxd_id %d: packet is not matched,\n", idx);
+		return -EAGAIN;
+	}
+
+	/* prepare for receive */
+	rxd = &priv->rxd_ring[idx];
+	rxd->hdr = EDH_STICKY | EDH_NPV | EDH_EOWN;
+
+	flush_dcache_range((ulong)rxd, (ulong)rxd + sizeof(*rxd));
+
+	/* decrement rx pkt count */
+	writel(ETHCON_BUFCDEC, &ectl_p->con1.set);
+
+	debug("%s: %d / idx %i, hdr %x, data_buff %x, stat %x, nexted %x\n",
+	      __func__, __LINE__, idx, rxd->hdr, rxd->data_buff,
+	      rxd->stat2, rxd->next_ed);
+
+	priv->rxd_idx = (priv->rxd_idx + 1) % MAX_RX_DESCR;
+
+	return 0;
+}
+
+static const struct eth_ops pic32_eth_ops = {
+	.start		= pic32_eth_start,
+	.send		= pic32_eth_send,
+	.recv		= pic32_eth_recv,
+	.free_pkt	= pic32_eth_free_pkt,
+	.stop		= pic32_eth_stop,
+};
+
+static int pic32_eth_probe(struct udevice *dev)
+{
+	struct eth_pdata *pdata = dev_get_platdata(dev);
+	struct pic32eth_dev *priv = dev_get_priv(dev);
+	const char *phy_mode;
+	void __iomem *iobase;
+	fdt_addr_t addr;
+	fdt_size_t size;
+	int offset = 0;
+	int phy_addr = -1;
+
+	addr = fdtdec_get_addr_size(gd->fdt_blob, dev->of_offset, "reg", &size);
+	if (addr == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	iobase = ioremap(addr, size);
+	pdata->iobase = (phys_addr_t)addr;
+
+	/* get phy mode */
+	pdata->phy_interface = -1;
+	phy_mode = fdt_getprop(gd->fdt_blob, dev->of_offset, "phy-mode", NULL);
+	if (phy_mode)
+		pdata->phy_interface = phy_get_interface_by_name(phy_mode);
+	if (pdata->phy_interface == -1) {
+		debug("%s: Invalid PHY interface '%s'\n", __func__, phy_mode);
+		return -EINVAL;
+	}
+
+	/* get phy addr */
+	offset = fdtdec_lookup_phandle(gd->fdt_blob, dev->of_offset,
+				       "phy-handle");
+	if (offset > 0)
+		phy_addr = fdtdec_get_int(gd->fdt_blob, offset, "reg", -1);
+
+	/* phy reset gpio */
+	gpio_request_by_name_nodev(gd->fdt_blob, dev->of_offset,
+				   "reset-gpios", 0,
+				   &priv->rst_gpio, GPIOD_IS_OUT);
+
+	priv->phyif	= pdata->phy_interface;
+	priv->phy_addr	= phy_addr;
+	priv->ectl_regs	= iobase;
+	priv->emac_regs	= iobase + PIC32_EMAC1CFG1;
+
+	pic32_mii_init(priv);
+
+	return pic32_phy_init(priv, dev);
+}
+
+static int pic32_eth_remove(struct udevice *dev)
+{
+	struct pic32eth_dev *priv = dev_get_priv(dev);
+	struct mii_dev *bus;
+
+	dm_gpio_free(dev, &priv->rst_gpio);
+	phy_shutdown(priv->phydev);
+	free(priv->phydev);
+	bus = miiphy_get_dev_by_name(PIC32_MDIO_NAME);
+	mdio_unregister(bus);
+	mdio_free(bus);
+	iounmap(priv->ectl_regs);
+	return 0;
+}
+
+static const struct udevice_id pic32_eth_ids[] = {
+	{ .compatible = "microchip,pic32mzda-eth" },
+	{ }
+};
+
+U_BOOT_DRIVER(pic32_ethernet) = {
+	.name			= "pic32_ethernet",
+	.id			= UCLASS_ETH,
+	.of_match		= pic32_eth_ids,
+	.probe			= pic32_eth_probe,
+	.remove			= pic32_eth_remove,
+	.ops			= &pic32_eth_ops,
+	.priv_auto_alloc_size	= sizeof(struct pic32eth_dev),
+	.platdata_auto_alloc_size	= sizeof(struct eth_pdata),
+};

drivers/net/pic32_eth.h

@@ -0,0 +1,164 @@
+/*
+ * (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ */
+
+#ifndef __MICROCHIP_PIC32_ETH_H_
+#define __MICROCHIP_PIC32_ETH_H_
+
+#include <mach/pic32.h>
+
+/* Ethernet */
+struct pic32_ectl_regs {
+	struct pic32_reg_atomic con1; /* 0x00 */
+	struct pic32_reg_atomic con2; /* 0x10 */
+	struct pic32_reg_atomic txst; /* 0x20 */
+	struct pic32_reg_atomic rxst; /* 0x30 */
+	struct pic32_reg_atomic ht0;  /* 0x40 */
+	struct pic32_reg_atomic ht1;  /* 0x50 */
+	struct pic32_reg_atomic pmm0; /* 0x60 */
+	struct pic32_reg_atomic pmm1; /* 0x70 */
+	struct pic32_reg_atomic pmcs; /* 0x80 */
+	struct pic32_reg_atomic pmo;  /* 0x90 */
+	struct pic32_reg_atomic rxfc; /* 0xa0 */
+	struct pic32_reg_atomic rxwm; /* 0xb0 */
+	struct pic32_reg_atomic ien;  /* 0xc0 */
+	struct pic32_reg_atomic irq;  /* 0xd0 */
+	struct pic32_reg_atomic stat; /* 0xe0 */
+};
+
+struct pic32_mii_regs {
+	struct pic32_reg_atomic mcfg; /* 0x280 */
+	struct pic32_reg_atomic mcmd; /* 0x290 */
+	struct pic32_reg_atomic madr; /* 0x2a0 */
+	struct pic32_reg_atomic mwtd; /* 0x2b0 */
+	struct pic32_reg_atomic mrdd; /* 0x2c0 */
+	struct pic32_reg_atomic mind; /* 0x2d0 */
+};
+
+struct pic32_emac_regs {
+	struct pic32_reg_atomic cfg1; /* 0x200*/
+	struct pic32_reg_atomic cfg2; /* 0x210*/
+	struct pic32_reg_atomic ipgt; /* 0x220*/
+	struct pic32_reg_atomic ipgr; /* 0x230*/
+	struct pic32_reg_atomic clrt; /* 0x240*/
+	struct pic32_reg_atomic maxf; /* 0x250*/
+	struct pic32_reg_atomic supp; /* 0x260*/
+	struct pic32_reg_atomic test; /* 0x270*/
+	struct pic32_mii_regs mii;    /* 0x280 - 0x2d0 */
+	struct pic32_reg_atomic res1; /* 0x2e0 */
+	struct pic32_reg_atomic res2; /* 0x2f0 */
+	struct pic32_reg_atomic sa0;  /* 0x300 */
+	struct pic32_reg_atomic sa1;  /* 0x310 */
+	struct pic32_reg_atomic sa2;  /* 0x320 */
+};
+
+/* ETHCON1 Reg field */
+#define ETHCON_BUFCDEC		BIT(0)
+#define ETHCON_RXEN		BIT(8)
+#define ETHCON_TXRTS		BIT(9)
+#define ETHCON_ON		BIT(15)
+
+/* ETHCON2 Reg field */
+#define ETHCON_RXBUFSZ		0x7f
+#define ETHCON_RXBUFSZ_SHFT	0x4
+
+/* ETHSTAT Reg field */
+#define ETHSTAT_BUSY		BIT(7)
+#define ETHSTAT_BUFCNT		0x00ff0000
+
+/* ETHRXFC Register fields */
+#define ETHRXFC_BCEN		BIT(0)
+#define ETHRXFC_MCEN		BIT(1)
+#define ETHRXFC_UCEN		BIT(3)
+#define ETHRXFC_RUNTEN		BIT(4)
+#define ETHRXFC_CRCOKEN		BIT(5)
+
+/* EMAC1CFG1 register offset */
+#define PIC32_EMAC1CFG1		0x0200
+
+/* EMAC1CFG1 register fields */
+#define EMAC_RXENABLE		BIT(0)
+#define EMAC_RXPAUSE		BIT(2)
+#define EMAC_TXPAUSE		BIT(3)
+#define EMAC_SOFTRESET		BIT(15)
+
+/* EMAC1CFG2 register fields */
+#define EMAC_FULLDUP		BIT(0)
+#define EMAC_LENGTHCK		BIT(1)
+#define EMAC_CRCENABLE		BIT(4)
+#define EMAC_PADENABLE		BIT(5)
+#define EMAC_AUTOPAD		BIT(7)
+#define EMAC_EXCESS		BIT(14)
+
+/* EMAC1IPGT register magic */
+#define FULLDUP_GAP_TIME	0x15
+#define HALFDUP_GAP_TIME	0x12
+
+/* EMAC1SUPP register fields */
+#define EMAC_RMII_SPD100	BIT(8)
+#define EMAC_RMII_RESET		BIT(11)
+
+/* MII Management Configuration Register */
+#define MIIMCFG_RSTMGMT		BIT(15)
+#define MIIMCFG_CLKSEL_DIV40	0x0020	/* 100Mhz / 40 */
+
+/* MII Management Command Register */
+#define MIIMCMD_READ		BIT(0)
+#define MIIMCMD_SCAN		BIT(1)
+
+/* MII Management Address Register */
+#define MIIMADD_REGADDR		0x1f
+#define MIIMADD_REGADDR_SHIFT	0
+#define MIIMADD_PHYADDR_SHIFT	8
+
+/* MII Management Indicator Register */
+#define MIIMIND_BUSY		BIT(0)
+#define MIIMIND_NOTVALID	BIT(2)
+#define MIIMIND_LINKFAIL	BIT(3)
+
+/* Packet Descriptor */
+/* Received Packet Status */
+#define _RSV1_PKT_CSUM		0xffff
+#define _RSV2_CRC_ERR		BIT(20)
+#define _RSV2_LEN_ERR		BIT(21)
+#define _RSV2_RX_OK		BIT(23)
+#define _RSV2_RX_COUNT		0xffff
+
+#define RSV_RX_CSUM(__rsv1)	((__rsv1) & _RSV1_PKT_CSUM)
+#define RSV_RX_COUNT(__rsv2)	((__rsv2) & _RSV2_RX_COUNT)
+#define RSV_RX_OK(__rsv2)	((__rsv2) & _RSV2_RX_OK)
+#define RSV_CRC_ERR(__rsv2)	((__rsv2) & _RSV2_CRC_ERR)
+
+/* Ethernet Hardware Descriptor Header bits */
+#define EDH_EOWN		BIT(7)
+#define EDH_NPV			BIT(8)
+#define EDH_STICKY		BIT(9)
+#define _EDH_BCOUNT		0x07ff0000
+#define EDH_EOP			BIT(30)
+#define EDH_SOP			BIT(31)
+#define EDH_BCOUNT_SHIFT	16
+#define EDH_BCOUNT(len)		((len) << EDH_BCOUNT_SHIFT)
+
+/* Ethernet Hardware Descriptors
+ * ref: PIC32 Family Reference Manual Table 35-7
+ * This structure represents the layout of the DMA
+ * memory shared between the CPU and the Ethernet
+ * controller.
+ */
+/* TX/RX DMA descriptor */
+struct eth_dma_desc {
+	u32 hdr;	/* header */
+	u32 data_buff;	/* data buffer address */
+	u32 stat1;	/* transmit/receive packet status */
+	u32 stat2;	/* transmit/receive packet status */
+	u32 next_ed;	/* next descriptor */
+};
+
+#define PIC32_MDIO_NAME "PIC32_EMAC"
+
+int pic32_mdio_init(const char *name, ulong ioaddr);
+
+#endif /* __MICROCHIP_PIC32_ETH_H_*/

drivers/net/pic32_mdio.c

@@ -0,0 +1,121 @@
+/*
+ * pic32_mdio.c: PIC32 MDIO/MII driver, part of pic32_eth.c.
+ *
+ * Copyright 2015 Microchip Inc.
+ *	Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <phy.h>
+#include <miiphy.h>
+#include <errno.h>
+#include <wait_bit.h>
+#include <asm/io.h>
+#include "pic32_eth.h"
+
+static int pic32_mdio_write(struct mii_dev *bus,
+			    int addr, int dev_addr,
+			    int reg, u16 value)
+{
+	u32 v;
+	struct pic32_mii_regs *mii_regs = bus->priv;
+
+	/* Wait for the previous operation to finish */
+	wait_for_bit(__func__, &mii_regs->mind.raw, MIIMIND_BUSY,
+		     false, CONFIG_SYS_HZ, true);
+
+	/* Put phyaddr and regaddr into MIIMADD */
+	v = (addr << MIIMADD_PHYADDR_SHIFT) | (reg & MIIMADD_REGADDR);
+	writel(v, &mii_regs->madr.raw);
+
+	/* Initiate a write command */
+	writel(value, &mii_regs->mwtd.raw);
+
+	/* Wait 30 clock cycles for busy flag to be set */
+	udelay(12);
+
+	/* Wait for write to complete */
+	wait_for_bit(__func__, &mii_regs->mind.raw, MIIMIND_BUSY,
+		     false, CONFIG_SYS_HZ, true);
+
+	return 0;
+}
+
+static int pic32_mdio_read(struct mii_dev *bus, int addr, int devaddr, int reg)
+{
+	u32 v;
+	struct pic32_mii_regs *mii_regs = bus->priv;
+
+	/* Wait for the previous operation to finish */
+	wait_for_bit(__func__, &mii_regs->mind.raw, MIIMIND_BUSY,
+		     false, CONFIG_SYS_HZ, true);
+
+	/* Put phyaddr and regaddr into MIIMADD */
+	v = (addr << MIIMADD_PHYADDR_SHIFT) | (reg & MIIMADD_REGADDR);
+	writel(v, &mii_regs->madr.raw);
+
+	/* Initiate a read command */
+	writel(MIIMCMD_READ, &mii_regs->mcmd.raw);
+
+	/* Wait 30 clock cycles for busy flag to be set */
+	udelay(12);
+
+	/* Wait for read to complete */
+	wait_for_bit(__func__, &mii_regs->mind.raw,
+		     MIIMIND_NOTVALID | MIIMIND_BUSY,
+		     false, CONFIG_SYS_HZ, false);
+
+	/* Clear the command register */
+	writel(0, &mii_regs->mcmd.raw);
+
+	/* Grab the value read from the PHY */
+	v = readl(&mii_regs->mrdd.raw);
+	return v;
+}
+
+static int pic32_mdio_reset(struct mii_dev *bus)
+{
+	struct pic32_mii_regs *mii_regs = bus->priv;
+
+	/* Reset MII (due to new addresses) */
+	writel(MIIMCFG_RSTMGMT, &mii_regs->mcfg.raw);
+
+	/* Wait for the operation to finish */
+	wait_for_bit(__func__, &mii_regs->mind.raw, MIIMIND_BUSY,
+		     false, CONFIG_SYS_HZ, true);
+
+	/* Clear reset bit */
+	writel(0, &mii_regs->mcfg);
+
+	/* Wait for the operation to finish */
+	wait_for_bit(__func__, &mii_regs->mind.raw, MIIMIND_BUSY,
+		     false, CONFIG_SYS_HZ, true);
+
+	/* Set the MII Management Clock (MDC) - no faster than 2.5 MHz */
+	writel(MIIMCFG_CLKSEL_DIV40, &mii_regs->mcfg.raw);
+
+	/* Wait for the operation to finish */
+	wait_for_bit(__func__, &mii_regs->mind.raw, MIIMIND_BUSY,
+		     false, CONFIG_SYS_HZ, true);
+	return 0;
+}
+
+int pic32_mdio_init(const char *name, ulong ioaddr)
+{
+	struct mii_dev *bus;
+
+	bus = mdio_alloc();
+	if (!bus) {
+		printf("Failed to allocate PIC32-MDIO bus\n");
+		return -ENOMEM;
+	}
+
+	bus->read = pic32_mdio_read;
+	bus->write = pic32_mdio_write;
+	bus->reset = pic32_mdio_reset;
+	strncpy(bus->name, name, sizeof(bus->name));
+	bus->priv = (void *)ioaddr;
+
+	return mdio_register(bus);
+}

drivers/pinctrl/Kconfig

@@ -131,6 +131,16 @@ config PINCTRL_SANDBOX
 	  actually does nothing but print debug messages when pinctrl
 	  operations are invoked.
 
+config PIC32_PINCTRL
+	bool "Microchip PIC32 pin-control and pin-mux driver"
+	depends on DM && MACH_PIC32
+	default y
+	help
+	  Supports individual pin selection and configuration for each remappable
+	  peripheral available on Microchip PIC32 SoCs. This driver is controlled
+	  by a device tree node which contains both GPIO defintion and pin control
+	  functions.
+
 endif
 
 source "drivers/pinctrl/uniphier/Kconfig"

drivers/pinctrl/Makefile

@@ -9,3 +9,4 @@ obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/
 obj-$(CONFIG_PINCTRL_SANDBOX)	+= pinctrl-sandbox.o
 
 obj-$(CONFIG_ARCH_UNIPHIER)	+= uniphier/
+obj-$(CONFIG_PIC32_PINCTRL)	+= pinctrl_pic32.o

drivers/pinctrl/pinctrl_pic32.c

@@ -0,0 +1,363 @@
+/*
+ * Pinctrl driver for Microchip PIC32 SoCs
+ * Copyright (c) 2015 Microchip Technology Inc.
+ * Written by Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <asm/io.h>
+#include <dm/pinctrl.h>
+#include <dm/root.h>
+#include <mach/pic32.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* PIC32 has 10 peripheral ports with 16 pins each.
+ * Ports are marked PORTA-PORTK or PORT0-PORT9.
+ */
+enum {
+	PIC32_PORT_A = 0,
+	PIC32_PORT_B = 1,
+	PIC32_PORT_C = 2,
+	PIC32_PORT_D = 3,
+	PIC32_PORT_E = 4,
+	PIC32_PORT_F = 5,
+	PIC32_PORT_G = 6,
+	PIC32_PORT_H = 7,
+	PIC32_PORT_J = 8, /* no PORT_I */
+	PIC32_PORT_K = 9,
+	PIC32_PINS_PER_PORT = 16,
+};
+
+#define PIN_CONFIG_PIC32_DIGITAL	(PIN_CONFIG_END + 1)
+#define PIN_CONFIG_PIC32_ANALOG		(PIN_CONFIG_END + 2)
+
+/* pin configuration descriptor */
+struct pic32_pin_config {
+	u16 port;	/* port number */
+	u16 pin;	/* pin number in the port */
+	u32 config;	/* one of PIN_CONFIG_* */
+};
+#define PIN_CONFIG(_prt, _pin, _cfg) \
+	{.port = (_prt), .pin = (_pin), .config = (_cfg), }
+
+/* In PIC32 muxing is performed at pin-level through two
+ * different set of registers - one set for input functions,
+ * and other for output functions.
+ * Pin configuration is handled through port register.
+ */
+/* Port control registers */
+struct pic32_reg_port {
+	struct pic32_reg_atomic ansel;
+	struct pic32_reg_atomic tris;
+	struct pic32_reg_atomic port;
+	struct pic32_reg_atomic lat;
+	struct pic32_reg_atomic odc;
+	struct pic32_reg_atomic cnpu;
+	struct pic32_reg_atomic cnpd;
+	struct pic32_reg_atomic cncon;
+	struct pic32_reg_atomic unused[8];
+};
+
+/* Input function mux registers */
+struct pic32_reg_in_mux {
+	u32 unused0;
+	u32 int1[4];
+	u32 unused1;
+	u32 t2ck[8];
+	u32 ic1[9];
+	u32 unused2;
+	u32 ocfar;
+	u32 unused3;
+	u32 u1rx;
+	u32 u1cts;
+	u32 u2rx;
+	u32 u2cts;
+	u32 u3rx;
+	u32 u3cts;
+	u32 u4rx;
+	u32 u4cts;
+	u32 u5rx;
+	u32 u5cts;
+	u32 u6rx;
+	u32 u6cts;
+	u32 unused4;
+	u32 sdi1;
+	u32 ss1;
+	u32 unused5;
+	u32 sdi2;
+	u32 ss2;
+	u32 unused6;
+	u32 sdi3;
+	u32 ss3;
+	u32 unused7;
+	u32 sdi4;
+	u32 ss4;
+	u32 unused8;
+	u32 sdi5;
+	u32 ss5;
+	u32 unused9;
+	u32 sdi6;
+	u32 ss6;
+	u32 c1rx;
+	u32 c2rx;
+	u32 refclki1;
+	u32 refclki2;
+	u32 refclki3;
+	u32 refclki4;
+};
+
+/* output mux register offset */
+#define PPS_OUT(__port, __pin) \
+	(((__port) * PIC32_PINS_PER_PORT + (__pin)) << 2)
+
+
+struct pic32_pinctrl_priv {
+	struct pic32_reg_in_mux *mux_in; /* mux input function */
+	struct pic32_reg_port *pinconf; /* pin configuration*/
+	void __iomem *mux_out;	/* mux output function */
+};
+
+enum {
+	PERIPH_ID_UART1,
+	PERIPH_ID_UART2,
+	PERIPH_ID_ETH,
+	PERIPH_ID_USB,
+	PERIPH_ID_SDHCI,
+	PERIPH_ID_I2C1,
+	PERIPH_ID_I2C2,
+	PERIPH_ID_SPI1,
+	PERIPH_ID_SPI2,
+	PERIPH_ID_SQI,
+};
+
+static int pic32_pinconfig_one(struct pic32_pinctrl_priv *priv,
+			       u32 port_nr, u32 pin, u32 param)
+{
+	struct pic32_reg_port *port;
+
+	port = &priv->pinconf[port_nr];
+	switch (param) {
+	case PIN_CONFIG_PIC32_DIGITAL:
+		writel(BIT(pin), &port->ansel.clr);
+		break;
+	case PIN_CONFIG_PIC32_ANALOG:
+		writel(BIT(pin), &port->ansel.set);
+		break;
+	case PIN_CONFIG_INPUT_ENABLE:
+		writel(BIT(pin), &port->tris.set);
+		break;
+	case PIN_CONFIG_OUTPUT:
+		writel(BIT(pin), &port->tris.clr);
+		break;
+	case PIN_CONFIG_BIAS_PULL_UP:
+		writel(BIT(pin), &port->cnpu.set);
+		break;
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		writel(BIT(pin), &port->cnpd.set);
+		break;
+	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+		writel(BIT(pin), &port->odc.set);
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static int pic32_pinconfig_set(struct pic32_pinctrl_priv *priv,
+			       const struct pic32_pin_config *list, int count)
+{
+	int i;
+
+	for (i = 0 ; i < count; i++)
+		pic32_pinconfig_one(priv, list[i].port,
+				    list[i].pin, list[i].config);
+
+	return 0;
+}
+
+static void pic32_eth_pin_config(struct udevice *dev)
+{
+	struct pic32_pinctrl_priv *priv = dev_get_priv(dev);
+	const struct pic32_pin_config configs[] = {
+		/* EMDC - D11 */
+		PIN_CONFIG(PIC32_PORT_D, 11, PIN_CONFIG_PIC32_DIGITAL),
+		PIN_CONFIG(PIC32_PORT_D, 11, PIN_CONFIG_OUTPUT),
+		/* ETXEN */
+		PIN_CONFIG(PIC32_PORT_D, 6, PIN_CONFIG_PIC32_DIGITAL),
+		PIN_CONFIG(PIC32_PORT_D, 6, PIN_CONFIG_OUTPUT),
+		/* ECRSDV */
+		PIN_CONFIG(PIC32_PORT_H, 13, PIN_CONFIG_PIC32_DIGITAL),
+		PIN_CONFIG(PIC32_PORT_H, 13, PIN_CONFIG_INPUT_ENABLE),
+		/* ERXD0 */
+		PIN_CONFIG(PIC32_PORT_H, 8, PIN_CONFIG_PIC32_DIGITAL),
+		PIN_CONFIG(PIC32_PORT_H, 8, PIN_CONFIG_INPUT_ENABLE),
+		PIN_CONFIG(PIC32_PORT_H, 8, PIN_CONFIG_BIAS_PULL_DOWN),
+		/* ERXD1 */
+		PIN_CONFIG(PIC32_PORT_H, 5, PIN_CONFIG_PIC32_DIGITAL),
+		PIN_CONFIG(PIC32_PORT_H, 5, PIN_CONFIG_INPUT_ENABLE),
+		PIN_CONFIG(PIC32_PORT_H, 5, PIN_CONFIG_BIAS_PULL_DOWN),
+		/* EREFCLK */
+		PIN_CONFIG(PIC32_PORT_J, 11, PIN_CONFIG_PIC32_DIGITAL),
+		PIN_CONFIG(PIC32_PORT_J, 11, PIN_CONFIG_INPUT_ENABLE),
+		/* ETXD1 */
+		PIN_CONFIG(PIC32_PORT_J, 9, PIN_CONFIG_PIC32_DIGITAL),
+		PIN_CONFIG(PIC32_PORT_J, 9, PIN_CONFIG_OUTPUT),
+		/* ETXD0 */
+		PIN_CONFIG(PIC32_PORT_J, 8, PIN_CONFIG_PIC32_DIGITAL),
+		PIN_CONFIG(PIC32_PORT_J, 8, PIN_CONFIG_OUTPUT),
+		/* EMDIO */
+		PIN_CONFIG(PIC32_PORT_J, 1, PIN_CONFIG_PIC32_DIGITAL),
+		PIN_CONFIG(PIC32_PORT_J, 1, PIN_CONFIG_INPUT_ENABLE),
+		/* ERXERR */
+		PIN_CONFIG(PIC32_PORT_F, 3, PIN_CONFIG_PIC32_DIGITAL),
+		PIN_CONFIG(PIC32_PORT_F, 3, PIN_CONFIG_INPUT_ENABLE),
+	};
+
+	pic32_pinconfig_set(priv, configs, ARRAY_SIZE(configs));
+}
+
+static int pic32_pinctrl_request(struct udevice *dev, int func, int flags)
+{
+	struct pic32_pinctrl_priv *priv = dev_get_priv(dev);
+
+	switch (func) {
+	case PERIPH_ID_UART2:
+		/* PPS for U2 RX/TX */
+		writel(0x02, priv->mux_out + PPS_OUT(PIC32_PORT_G, 9));
+		writel(0x05, &priv->mux_in->u2rx); /* B0 */
+		/* set digital mode */
+		pic32_pinconfig_one(priv, PIC32_PORT_G, 9,
+				    PIN_CONFIG_PIC32_DIGITAL);
+		pic32_pinconfig_one(priv, PIC32_PORT_B, 0,
+				    PIN_CONFIG_PIC32_DIGITAL);
+		break;
+	case PERIPH_ID_ETH:
+		pic32_eth_pin_config(dev);
+		break;
+	default:
+		debug("%s: unknown-unhandled case\n", __func__);
+		break;
+	}
+
+	return 0;
+}
+
+static int pic32_pinctrl_get_periph_id(struct udevice *dev,
+				       struct udevice *periph)
+{
+	int ret;
+	u32 cell[2];
+
+	ret = fdtdec_get_int_array(gd->fdt_blob, periph->of_offset,
+				   "interrupts", cell, ARRAY_SIZE(cell));
+	if (ret < 0)
+		return -EINVAL;
+
+	/* interrupt number */
+	switch (cell[0]) {
+	case 112 ... 114:
+		return PERIPH_ID_UART1;
+	case 145 ... 147:
+		return PERIPH_ID_UART2;
+	case 109 ... 111:
+		return PERIPH_ID_SPI1;
+	case 142 ... 144:
+		return PERIPH_ID_SPI2;
+	case 115 ... 117:
+		return PERIPH_ID_I2C1;
+	case 148 ... 150:
+		return PERIPH_ID_I2C2;
+	case 132 ... 133:
+		return PERIPH_ID_USB;
+	case 169:
+		return PERIPH_ID_SQI;
+	case 191:
+		return PERIPH_ID_SDHCI;
+	case 153:
+		return PERIPH_ID_ETH;
+	default:
+		break;
+	}
+
+	return -ENOENT;
+}
+
+static int pic32_pinctrl_set_state_simple(struct udevice *dev,
+					  struct udevice *periph)
+{
+	int func;
+
+	debug("%s: periph %s\n", __func__, periph->name);
+	func = pic32_pinctrl_get_periph_id(dev, periph);
+	if (func < 0)
+		return func;
+	return pic32_pinctrl_request(dev, func, 0);
+}
+
+static struct pinctrl_ops pic32_pinctrl_ops = {
+	.set_state_simple	= pic32_pinctrl_set_state_simple,
+	.request		= pic32_pinctrl_request,
+	.get_periph_id		= pic32_pinctrl_get_periph_id,
+};
+
+static int pic32_pinctrl_probe(struct udevice *dev)
+{
+	struct pic32_pinctrl_priv *priv = dev_get_priv(dev);
+	struct fdt_resource res;
+	void *fdt = (void *)gd->fdt_blob;
+	int node = dev->of_offset;
+	int ret;
+
+	ret = fdt_get_named_resource(fdt, node, "reg", "reg-names",
+				     "ppsin", &res);
+	if (ret < 0) {
+		printf("pinctrl: resource \"ppsin\" not found\n");
+		return ret;
+	}
+	priv->mux_in = ioremap(res.start, fdt_resource_size(&res));
+
+	ret = fdt_get_named_resource(fdt, node, "reg", "reg-names",
+				     "ppsout", &res);
+	if (ret < 0) {
+		printf("pinctrl: resource \"ppsout\" not found\n");
+		return ret;
+	}
+	priv->mux_out = ioremap(res.start, fdt_resource_size(&res));
+
+	ret = fdt_get_named_resource(fdt, node, "reg", "reg-names",
+				     "port", &res);
+	if (ret < 0) {
+		printf("pinctrl: resource \"port\" not found\n");
+		return ret;
+	}
+	priv->pinconf = ioremap(res.start, fdt_resource_size(&res));
+
+	return 0;
+}
+
+static int pic32_pinctrl_bind(struct udevice *dev)
+{
+	/* scan child GPIO banks */
+	return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
+}
+
+static const struct udevice_id pic32_pinctrl_ids[] = {
+	{ .compatible = "microchip,pic32mzda-pinctrl" },
+	{ }
+};
+
+U_BOOT_DRIVER(pinctrl_pic32) = {
+	.name		= "pinctrl_pic32",
+	.id		= UCLASS_PINCTRL,
+	.of_match	= pic32_pinctrl_ids,
+	.ops		= &pic32_pinctrl_ops,
+	.probe		= pic32_pinctrl_probe,
+	.bind		= pic32_pinctrl_bind,
+	.priv_auto_alloc_size = sizeof(struct pic32_pinctrl_priv),
+};

drivers/serial/Kconfig

@@ -150,6 +150,14 @@ config DEBUG_UART_PL011
 	  work. The driver will be available until the real driver model
 	  serial is running.
 
+config DEBUG_UART_PIC32
+	bool "Microchip PIC32"
+	depends on PIC32_SERIAL
+	help
+	  Select this to enable a debug UART using the serial_pic32 driver. You
+	  will need to provide parameters to make this work. The driver will
+	  be available until the real driver model serial is running.
+
 endchoice
 
 config DEBUG_UART_BASE
@@ -241,6 +249,13 @@ config FSL_LPUART
 	  Select this to enable a Low Power UART for Freescale VF610 and
 	  QorIQ Layerscape devices.
 
+config PIC32_SERIAL
+	bool "Support for Microchip PIC32 on-chip UART"
+	depends on DM_SERIAL && MACH_PIC32
+	default y
+	help
+	  Support for the UART found on Microchip PIC32 SoC's.
+
 config SYS_NS16550
 	bool "NS16550 UART or compatible"
 	help

drivers/serial/Makefile

@@ -41,6 +41,7 @@ obj-$(CONFIG_MXS_AUART) += mxs_auart.o
 obj-$(CONFIG_ARC_SERIAL) += serial_arc.o
 obj-$(CONFIG_UNIPHIER_SERIAL) += serial_uniphier.o
 obj-$(CONFIG_STM32_SERIAL) += serial_stm32.o
+obj-$(CONFIG_PIC32_SERIAL) += serial_pic32.o
 
 ifndef CONFIG_SPL_BUILD
 obj-$(CONFIG_USB_TTY) += usbtty.o

drivers/serial/serial_pic32.c

@@ -0,0 +1,198 @@
+/*
+ * (c) 2015 Paul Thacker <paul.thacker@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ */
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <serial.h>
+#include <wait_bit.h>
+#include <mach/pic32.h>
+#include <dt-bindings/clock/microchip,clock.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* UART Control Registers */
+#define U_MOD		0x00
+#define U_MODCLR	(U_MOD + _CLR_OFFSET)
+#define U_MODSET	(U_MOD + _SET_OFFSET)
+#define U_STA		0x10
+#define U_STACLR	(U_STA + _CLR_OFFSET)
+#define U_STASET	(U_STA + _SET_OFFSET)
+#define U_TXR		0x20
+#define U_RXR		0x30
+#define U_BRG		0x40
+
+/* U_MOD bits */
+#define UART_ENABLE		BIT(15)
+
+/* U_STA bits */
+#define UART_RX_ENABLE		BIT(12)
+#define UART_TX_BRK		BIT(11)
+#define UART_TX_ENABLE		BIT(10)
+#define UART_TX_FULL		BIT(9)
+#define UART_TX_EMPTY		BIT(8)
+#define UART_RX_OVER		BIT(1)
+#define UART_RX_DATA_AVAIL	BIT(0)
+
+struct pic32_uart_priv {
+	void __iomem *base;
+	ulong uartclk;
+};
+
+/*
+ * Initialize the serial port with the given baudrate.
+ * The settings are always 8 data bits, no parity, 1 stop bit, no start bits.
+ */
+static int pic32_serial_init(void __iomem *base, ulong clk, u32 baudrate)
+{
+	u32 div = DIV_ROUND_CLOSEST(clk, baudrate * 16);
+
+	/* wait for TX FIFO to empty */
+	wait_for_bit(__func__, base + U_STA, UART_TX_EMPTY,
+		     true, CONFIG_SYS_HZ, false);
+
+	/* send break */
+	writel(UART_TX_BRK, base + U_STASET);
+
+	/* disable and clear mode */
+	writel(0, base + U_MOD);
+	writel(0, base + U_STA);
+
+	/* set baud rate generator */
+	writel(div - 1, base + U_BRG);
+
+	/* enable the UART for TX and RX */
+	writel(UART_TX_ENABLE | UART_RX_ENABLE, base + U_STASET);
+
+	/* enable the UART */
+	writel(UART_ENABLE, base + U_MODSET);
+	return 0;
+}
+
+/* Check whether any char pending in RX fifo */
+static int pic32_uart_pending_input(void __iomem *base)
+{
+	/* check if rx buffer overrun error has occurred */
+	if (readl(base + U_STA) & UART_RX_OVER) {
+		readl(base + U_RXR);
+
+		/* clear overrun error to keep receiving */
+		writel(UART_RX_OVER, base + U_STACLR);
+	}
+
+	/* In PIC32 there is no way to know number of outstanding
+	 * chars in rx-fifo. Only it can be known whether there is any.
+	 */
+	return readl(base + U_STA) & UART_RX_DATA_AVAIL;
+}
+
+static int pic32_uart_pending(struct udevice *dev, bool input)
+{
+	struct pic32_uart_priv *priv = dev_get_priv(dev);
+
+	if (input)
+		return pic32_uart_pending_input(priv->base);
+
+	return !(readl(priv->base + U_STA) & UART_TX_EMPTY);
+}
+
+static int pic32_uart_setbrg(struct udevice *dev, int baudrate)
+{
+	struct pic32_uart_priv *priv = dev_get_priv(dev);
+
+	return pic32_serial_init(priv->base, priv->uartclk, baudrate);
+}
+
+static int pic32_uart_putc(struct udevice *dev, const char ch)
+{
+	struct pic32_uart_priv *priv = dev_get_priv(dev);
+
+	/* Check if Tx FIFO is full */
+	if (readl(priv->base + U_STA) & UART_TX_FULL)
+		return -EAGAIN;
+
+	/* pump the char to tx buffer */
+	writel(ch, priv->base + U_TXR);
+
+	return 0;
+}
+
+static int pic32_uart_getc(struct udevice *dev)
+{
+	struct pic32_uart_priv *priv = dev_get_priv(dev);
+
+	/* return error if RX fifo is empty */
+	if (!pic32_uart_pending_input(priv->base))
+		return -EAGAIN;
+
+	/* read the character from rx buffer */
+	return readl(priv->base + U_RXR) & 0xff;
+}
+
+static int pic32_uart_probe(struct udevice *dev)
+{
+	struct pic32_uart_priv *priv = dev_get_priv(dev);
+	struct udevice *clkdev;
+	fdt_addr_t addr;
+	fdt_size_t size;
+	int ret;
+
+	/* get address */
+	addr = fdtdec_get_addr_size(gd->fdt_blob, dev->of_offset, "reg", &size);
+	if (addr == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	priv->base = ioremap(addr, size);
+
+	/* get clock rate */
+	ret = clk_get_by_index(dev, 0, &clkdev);
+	if (ret < 0)
+		return ret;
+	priv->uartclk = clk_get_periph_rate(clkdev, ret);
+
+	/* initialize serial */
+	return pic32_serial_init(priv->base, priv->uartclk, CONFIG_BAUDRATE);
+}
+
+static const struct dm_serial_ops pic32_uart_ops = {
+	.putc		= pic32_uart_putc,
+	.pending	= pic32_uart_pending,
+	.getc		= pic32_uart_getc,
+	.setbrg		= pic32_uart_setbrg,
+};
+
+static const struct udevice_id pic32_uart_ids[] = {
+	{ .compatible = "microchip,pic32mzda-uart" },
+	{}
+};
+
+U_BOOT_DRIVER(pic32_serial) = {
+	.name		= "pic32-uart",
+	.id		= UCLASS_SERIAL,
+	.of_match	= pic32_uart_ids,
+	.probe		= pic32_uart_probe,
+	.ops		= &pic32_uart_ops,
+	.flags		= DM_FLAG_PRE_RELOC,
+	.priv_auto_alloc_size = sizeof(struct pic32_uart_priv),
+};
+
+#ifdef CONFIG_DEBUG_UART_PIC32
+#include <debug_uart.h>
+
+static inline void _debug_uart_init(void)
+{
+	void __iomem *base = (void __iomem *)CONFIG_DEBUG_UART_BASE;
+
+	pic32_serial_init(base, CONFIG_DEBUG_UART_CLOCK, CONFIG_BAUDRATE);
+}
+
+static inline void _debug_uart_putc(int ch)
+{
+	writel(ch, CONFIG_DEBUG_UART_BASE + U_TXR);
+}
+
+DEBUG_UART_FUNCS
+#endif

include/configs/pic32mzdask.h

@@ -0,0 +1,168 @@
+/*
+ * (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ * Microchip PIC32MZ[DA] Starter Kit.
+ */
+
+#ifndef __PIC32MZDASK_CONFIG_H
+#define __PIC32MZDASK_CONFIG_H
+
+/* System Configuration */
+#define CONFIG_SYS_TEXT_BASE		0x9d004000 /* .text */
+#define CONFIG_DISPLAY_BOARDINFO
+
+/*--------------------------------------------
+ * CPU configuration
+ */
+/* CPU Timer rate */
+#define CONFIG_SYS_MIPS_TIMER_FREQ	100000000
+
+/* Cache Configuration */
+#define CONFIG_SYS_MIPS_CACHE_MODE	CONF_CM_CACHABLE_NONCOHERENT
+
+/*----------------------------------------------------------------------
+ * Memory Layout
+ */
+#define CONFIG_SYS_SRAM_BASE		0x80000000
+#define CONFIG_SYS_SRAM_SIZE		0x00080000 /* 512K */
+
+/* Initial RAM for temporary stack, global data */
+#define CONFIG_SYS_INIT_RAM_SIZE	0x10000
+#define CONFIG_SYS_INIT_RAM_ADDR	\
+	(CONFIG_SYS_SRAM_BASE + CONFIG_SYS_SRAM_SIZE - CONFIG_SYS_INIT_RAM_SIZE)
+#define CONFIG_SYS_INIT_SP_ADDR		\
+	(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE - 1)
+
+/* SDRAM Configuration (for final code, data, stack, heap) */
+#define CONFIG_SYS_SDRAM_BASE		0x88000000
+#define CONFIG_SYS_MALLOC_LEN		(256 << 10)
+#define CONFIG_SYS_BOOTPARAMS_LEN	(4 << 10)
+#define CONFIG_STACKSIZE		(4 << 10) /* regular stack */
+
+#define CONFIG_SYS_MONITOR_BASE		CONFIG_SYS_TEXT_BASE
+#define CONFIG_SYS_MONITOR_LEN		(192 << 10)
+
+#define CONFIG_SYS_LOAD_ADDR		0x88500000 /* default load address */
+#define CONFIG_SYS_ENV_ADDR		0x88300000
+#define CONFIG_SYS_FDT_ADDR		0x89d00000
+
+/* Memory Test */
+#define CONFIG_SYS_MEMTEST_START	0x88000000
+#define CONFIG_SYS_MEMTEST_END		0x88080000
+
+/*----------------------------------------------------------------------
+ * Commands
+ */
+#define CONFIG_SYS_LONGHELP		/* undef to save memory */
+#define CONFIG_CMD_CLK
+
+/*-------------------------------------------------
+ * FLASH configuration
+ */
+#define CONFIG_SYS_NO_FLASH
+
+/*------------------------------------------------------------
+ * Console Configuration
+ */
+#define CONFIG_BAUDRATE			115200
+#define CONFIG_SYS_CBSIZE		1024 /* Console I/O Buffer Size   */
+#define CONFIG_SYS_MAXARGS		16   /* max number of command args*/
+#define CONFIG_SYS_PBSIZE		\
+		(CONFIG_SYS_CBSIZE + sizeof(CONFIG_SYS_PROMPT) + 16)
+#define CONFIG_CMDLINE_EDITING		1
+
+/*-----------------------------------------------------------------------
+ * Networking Configuration
+ */
+#define CONFIG_MII
+#define CONFIG_PHY_SMSC
+#define CONFIG_SYS_RX_ETH_BUFFER	8
+#define CONFIG_NET_RETRY_COUNT		20
+#define CONFIG_ARP_TIMEOUT		500 /* millisec */
+
+#define CONFIG_CMD_MII
+
+/*
+ * BOOTP options
+ */
+#define CONFIG_BOOTP_BOOTFILESIZE
+#define CONFIG_BOOTP_BOOTPATH
+#define CONFIG_BOOTP_GATEWAY
+#define CONFIG_BOOTP_HOSTNAME
+
+/*
+ * Handover flattened device tree (dtb file) to Linux kernel
+ */
+#define CONFIG_OF_LIBFDT	1
+
+/*-----------------------------------------------------------------------
+ * SDHC Configuration
+ */
+#define CONFIG_SDHCI
+#define CONFIG_MMC
+#define CONFIG_GENERIC_MMC
+#define CONFIG_CMD_MMC
+
+/*-----------------------------------------------------------------------
+ * File System Configuration
+ */
+/* FAT FS */
+#define CONFIG_DOS_PARTITION
+#define CONFIG_PARTITION_UUIDS
+#define CONFIG_SUPPORT_VFAT
+#define CONFIG_FS_FAT
+#define CONFIG_FAT_WRITE
+#define CONFIG_CMD_FS_GENERIC
+#define CONFIG_CMD_PART
+#define CONFIG_CMD_FAT
+
+/* EXT4 FS */
+#define CONFIG_FS_EXT4
+#define CONFIG_CMD_EXT2
+#define CONFIG_CMD_EXT4
+#define CONFIG_CMD_EXT4_WRITE
+
+/* -------------------------------------------------
+ * Environment
+ */
+#define CONFIG_ENV_IS_NOWHERE	1
+#define CONFIG_ENV_SIZE		0x4000
+
+/* ---------------------------------------------------------------------
+ * Board boot configuration
+ */
+#define CONFIG_TIMESTAMP	/* Print image info with timestamp */
+#define CONFIG_BOOTDELAY	5
+
+#define MEM_LAYOUT_ENV_SETTINGS					\
+	"kernel_addr_r="__stringify(CONFIG_SYS_LOAD_ADDR)"\0"	\
+	"fdt_addr_r="__stringify(CONFIG_SYS_FDT_ADDR)"\0"	\
+	"scriptaddr="__stringify(CONFIG_SYS_ENV_ADDR)"\0"
+
+#define CONFIG_LEGACY_BOOTCMD_ENV					\
+	"legacy_bootcmd= "						\
+		"if load mmc 0 ${scriptaddr} uEnv.txt; then "		\
+			"env import -tr ${scriptaddr} ${filesize}; "	\
+			"if test -n \"${bootcmd_uenv}\" ; then "	\
+				"echo Running bootcmd_uenv ...; "	\
+				"run bootcmd_uenv; "			\
+			"fi; "						\
+		"fi; \0"
+
+#define BOOT_TARGET_DEVICES(func)	\
+	func(MMC, mmc, 0)		\
+	func(DHCP, dhcp, na)
+
+#include <config_distro_bootcmd.h>
+
+#define CONFIG_EXTRA_ENV_SETTINGS	\
+	MEM_LAYOUT_ENV_SETTINGS		\
+	CONFIG_LEGACY_BOOTCMD_ENV	\
+	BOOTENV
+
+#undef CONFIG_BOOTCOMMAND
+#define CONFIG_BOOTCOMMAND	"run distro_bootcmd || run legacy_bootcmd"
+
+#endif	/* __PIC32MZDASK_CONFIG_H */

include/dt-bindings/clock/microchip,clock.h

@@ -0,0 +1,29 @@
+/*
+ * (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ */
+
+#ifndef __CLK_MICROCHIP_PIC32
+#define __CLK_MICROCHIP_PIC32
+
+/* clock output indices */
+#define BASECLK	0
+#define PLLCLK	1
+#define MPLL	2
+#define SYSCLK	3
+#define PB1CLK	4
+#define PB2CLK	5
+#define PB3CLK	6
+#define PB4CLK	7
+#define PB5CLK	8
+#define PB6CLK	9
+#define PB7CLK	10
+#define REF1CLK	11
+#define REF2CLK	12
+#define REF3CLK	13
+#define REF4CLK	14
+#define REF5CLK	15
+
+#endif	/* __CLK_MICROCHIP_PIC32 */