Merge tag 'arc-uart-updates-for-2018.07-rc1' of git://git.denx.de/u-boot-arc

Add support for DEBUG_UART on ARC devboards

This required us to do 2 things:
 1) Insert a call to debug_uart_init() in early boot code
 2) Convert serial_arc to Kconfig

Once both items above are done we just patched defconfigs.

arch/arc/lib/start.S

@@ -75,6 +75,11 @@ ENTRY(_start)
 	/* Initialize reserved area - note: r0 already contains address */
 	bl	board_init_f_init_reserve
 
+#ifdef CONFIG_DEBUG_UART
+	/* Earliest point to set up early debug uart */
+	bl	debug_uart_init
+#endif
+
 	/* Zero the one and only argument of "board_init_f" */
 	mov_s	%r0, 0
 	bl	board_init_f

configs/axs101_defconfig

@@ -3,6 +3,7 @@ CONFIG_TARGET_AXS101=y
 CONFIG_SYS_TEXT_BASE=0x81000000
 CONFIG_SYS_CLK_FREQ=750000000
 CONFIG_DEFAULT_DEVICE_TREE="axs101"
+CONFIG_DEBUG_UART=y
 CONFIG_BOOTDELAY=3
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="console=ttyS3,115200n8"
@@ -33,6 +34,10 @@ CONFIG_DM_ETH=y
 CONFIG_PHY_GIGE=y
 CONFIG_ETH_DESIGNWARE=y
 CONFIG_DM_SERIAL=y
+CONFIG_DEBUG_UART_BASE=0xe0022000
+CONFIG_DEBUG_UART_CLOCK=33333333
+CONFIG_DEBUG_UART_SHIFT=2
+CONFIG_DEBUG_UART_ANNOUNCE=y
 CONFIG_SYS_NS16550=y
 CONFIG_USB=y
 CONFIG_DM_USB=y

configs/axs103_defconfig

@@ -3,6 +3,7 @@ CONFIG_ISA_ARCV2=y
 CONFIG_SYS_TEXT_BASE=0x81000000
 CONFIG_SYS_CLK_FREQ=100000000
 CONFIG_DEFAULT_DEVICE_TREE="axs103"
+CONFIG_DEBUG_UART=y
 CONFIG_BOOTDELAY=3
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="console=ttyS3,115200n8"
@@ -33,6 +34,10 @@ CONFIG_DM_ETH=y
 CONFIG_PHY_GIGE=y
 CONFIG_ETH_DESIGNWARE=y
 CONFIG_DM_SERIAL=y
+CONFIG_DEBUG_UART_BASE=0xe0022000
+CONFIG_DEBUG_UART_CLOCK=33333333
+CONFIG_DEBUG_UART_SHIFT=2
+CONFIG_DEBUG_UART_ANNOUNCE=y
 CONFIG_SYS_NS16550=y
 CONFIG_USB=y
 CONFIG_DM_USB=y

configs/hsdk_defconfig

@@ -4,6 +4,7 @@ CONFIG_TARGET_HSDK=y
 CONFIG_SYS_TEXT_BASE=0x81000000
 CONFIG_SYS_CLK_FREQ=500000000
 CONFIG_DEFAULT_DEVICE_TREE="hsdk"
+CONFIG_DEBUG_UART=y
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="console=ttyS0,115200n8"
 CONFIG_BOARD_EARLY_INIT_F=y
@@ -42,6 +43,10 @@ CONFIG_SPI_FLASH_SST=y
 CONFIG_DM_ETH=y
 CONFIG_ETH_DESIGNWARE=y
 CONFIG_DM_SERIAL=y
+CONFIG_DEBUG_UART_BASE=0xf0005000
+CONFIG_DEBUG_UART_CLOCK=33333333
+CONFIG_DEBUG_UART_SHIFT=2
+CONFIG_DEBUG_UART_ANNOUNCE=y
 CONFIG_SYS_NS16550=y
 CONFIG_SPI=y
 CONFIG_DM_SPI=y

configs/nsim_700_defconfig

@@ -3,6 +3,7 @@ CONFIG_TARGET_NSIM=y
 CONFIG_SYS_TEXT_BASE=0x81000000
 CONFIG_SYS_CLK_FREQ=70000000
 CONFIG_DEFAULT_DEVICE_TREE="nsim"
+CONFIG_DEBUG_UART=y
 CONFIG_BOOTDELAY=3
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="console=ttyARC0,115200n8"
@@ -13,4 +14,8 @@ CONFIG_OF_CONTROL=y
 CONFIG_OF_EMBED=y
 CONFIG_DM=y
 CONFIG_DM_SERIAL=y
+CONFIG_DEBUG_ARC_SERIAL=y
+CONFIG_DEBUG_UART_BASE=0xc0fc1000
+CONFIG_DEBUG_UART_CLOCK=70000000
+CONFIG_ARC_SERIAL=y
 CONFIG_USE_PRIVATE_LIBGCC=y

configs/nsim_700be_defconfig

@@ -4,6 +4,7 @@ CONFIG_TARGET_NSIM=y
 CONFIG_SYS_TEXT_BASE=0x81000000
 CONFIG_SYS_CLK_FREQ=70000000
 CONFIG_DEFAULT_DEVICE_TREE="nsim"
+CONFIG_DEBUG_UART=y
 CONFIG_BOOTDELAY=3
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="console=ttyARC0,115200n8"
@@ -14,4 +15,8 @@ CONFIG_OF_CONTROL=y
 CONFIG_OF_EMBED=y
 CONFIG_DM=y
 CONFIG_DM_SERIAL=y
+CONFIG_DEBUG_ARC_SERIAL=y
+CONFIG_DEBUG_UART_BASE=0xc0fc1000
+CONFIG_DEBUG_UART_CLOCK=70000000
+CONFIG_ARC_SERIAL=y
 CONFIG_USE_PRIVATE_LIBGCC=y

configs/nsim_hs38_defconfig

@@ -4,6 +4,7 @@ CONFIG_TARGET_NSIM=y
 CONFIG_SYS_TEXT_BASE=0x81000000
 CONFIG_SYS_CLK_FREQ=70000000
 CONFIG_DEFAULT_DEVICE_TREE="nsim"
+CONFIG_DEBUG_UART=y
 CONFIG_BOOTDELAY=3
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="console=ttyARC0,115200n8"
@@ -14,4 +15,8 @@ CONFIG_OF_CONTROL=y
 CONFIG_OF_EMBED=y
 CONFIG_DM=y
 CONFIG_DM_SERIAL=y
+CONFIG_DEBUG_ARC_SERIAL=y
+CONFIG_DEBUG_UART_BASE=0xc0fc1000
+CONFIG_DEBUG_UART_CLOCK=70000000
+CONFIG_ARC_SERIAL=y
 CONFIG_USE_PRIVATE_LIBGCC=y

configs/nsim_hs38be_defconfig

@@ -5,6 +5,7 @@ CONFIG_TARGET_NSIM=y
 CONFIG_SYS_TEXT_BASE=0x81000000
 CONFIG_SYS_CLK_FREQ=70000000
 CONFIG_DEFAULT_DEVICE_TREE="nsim"
+CONFIG_DEBUG_UART=y
 CONFIG_BOOTDELAY=3
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="console=ttyARC0,115200n8"
@@ -15,4 +16,8 @@ CONFIG_OF_CONTROL=y
 CONFIG_OF_EMBED=y
 CONFIG_DM=y
 CONFIG_DM_SERIAL=y
+CONFIG_DEBUG_ARC_SERIAL=y
+CONFIG_DEBUG_UART_BASE=0xc0fc1000
+CONFIG_DEBUG_UART_CLOCK=70000000
+CONFIG_ARC_SERIAL=y
 CONFIG_USE_PRIVATE_LIBGCC=y

drivers/serial/Kconfig

@@ -197,6 +197,15 @@ config DEBUG_UART_AR933X
 	  driver will be available until the real driver model serial is
 	  running.
 
+config DEBUG_ARC_SERIAL
+	bool "ARC UART"
+	depends on ARC_SERIAL
+	help
+	  Select this to enable a debug UART using the ARC UART driver.
+	  You will need to provide parameters to make this work. The
+	  driver will be available until the real driver model serial is
+	  running.
+
 config DEBUG_UART_ATMEL
 	bool "Atmel USART"
 	help
@@ -425,6 +434,13 @@ config AR933X_UART
 	  tree binding to operate, please refer to the document at
 	  doc/device-tree-bindings/serial/qca,ar9330-uart.txt.
 
+config ARC_SERIAL
+	bool "ARC UART support"
+	depends on DM_SERIAL
+	help
+	  Select this to enable support for ARC UART now typically
+	  only used in Synopsys DesignWare ARC simulators like nSIM.
+
 config ATMEL_USART
 	bool "Atmel USART support"
 	help

drivers/serial/serial_arc.c

@@ -130,3 +130,29 @@ U_BOOT_DRIVER(serial_arc) = {
 	.ops	= &arc_serial_ops,
 	.flags = DM_FLAG_PRE_RELOC,
 };
+
+#ifdef CONFIG_DEBUG_ARC_SERIAL
+#include <debug_uart.h>
+
+static inline void _debug_uart_init(void)
+{
+	struct arc_serial_regs *regs = (struct arc_serial_regs *)CONFIG_DEBUG_UART_BASE;
+	int arc_console_baud = CONFIG_DEBUG_UART_CLOCK / (CONFIG_BAUDRATE * 4) - 1;
+
+	writeb(arc_console_baud & 0xff, &regs->baudl);
+	writeb((arc_console_baud & 0xff00) >> 8, &regs->baudh);
+}
+
+static inline void _debug_uart_putc(int c)
+{
+	struct arc_serial_regs *regs = (struct arc_serial_regs *)CONFIG_DEBUG_UART_BASE;
+
+	while (!(readb(&regs->status) & UART_TXEMPTY))
+		;
+
+	writeb(c, &regs->data);
+}
+
+DEBUG_UART_FUNCS
+
+#endif

include/configs/nsim.h

@@ -24,16 +24,6 @@
 #define CONFIG_SYS_BOOTM_LEN		SZ_32M
 #define CONFIG_SYS_LOAD_ADDR		0x82000000
 
-/*
- * UART configuration
- *
- */
-#define CONFIG_ARC_SERIAL
-
-/*
- * Command line configuration
- */
-
 /*
  * Environment settings
  */

scripts/config_whitelist.txt

@@ -47,7 +47,6 @@ CONFIG_ARCH_RMOBILE_EXTRAM_BOOT
 CONFIG_ARCH_TEGRA
 CONFIG_ARCH_USE_BUILTIN_BSWAP
 CONFIG_ARC_MMU_VER
-CONFIG_ARC_SERIAL
 CONFIG_ARIES_M28_V10
 CONFIG_ARMADA100
 CONFIG_ARMADA100_FEC