gpio: atmel: Add the PIO4 driver support

The PIO4 is introduced from SAMA5D2, as a new version
for Atmel PIO controller.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>

arch/arm/mach-at91/include/mach/atmel_pio4.h

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2015 Atmel Corporation.
+ *		      Wenyou Yang <wenyou.yang@atmel.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __ATMEL_PIO4_H
+#define __ATMEL_PIO4_H
+
+#ifndef __ASSEMBLY__
+
+struct atmel_pio4_port {
+	u32 mskr;		/* 0x00 PIO Mask Register */
+	u32 cfgr;		/* 0x04 PIO Configuration Register */
+	u32 pdsr;		/* 0x08 PIO Pin Data Status Register */
+	u32 locksr;		/* 0x0C PIO Lock Status Register */
+	u32 sodr;		/* 0x10 PIO Set Output Data Register */
+	u32 codr;		/* 0x14 PIO Clear Output Data Register */
+	u32 odsr;		/* 0x18 PIO Output Data Status Register */
+	u32 reserved0;
+	u32 ier;		/* 0x20 PIO Interrupt Enable Register */
+	u32 idr;		/* 0x24 PIO Interrupt Disable Register */
+	u32 imr;		/* 0x28 PIO Interrupt Mask Register */
+	u32 isr;		/* 0x2C PIO Interrupt Status Register */
+	u32 reserved1[3];
+	u32 iofr;		/* 0x3C PIO I/O Freeze Register */
+};
+
+#endif
+
+#define AT91_PIO_PORTA		0x0
+#define AT91_PIO_PORTB		0x1
+#define AT91_PIO_PORTC		0x2
+#define AT91_PIO_PORTD		0x3
+
+int atmel_pio4_set_gpio(u32 port, u32 pin, u32 use_pullup);
+int atmel_pio4_set_a_periph(u32 port, u32 pin, u32 use_pullup);
+int atmel_pio4_set_b_periph(u32 port, u32 pin, u32 use_pullup);
+int atmel_pio4_set_c_periph(u32 port, u32 pin, u32 use_pullup);
+int atmel_pio4_set_d_periph(u32 port, u32 pin, u32 use_pullup);
+int atmel_pio4_set_e_periph(u32 port, u32 pin, u32 use_pullup);
+int atmel_pio4_set_f_periph(u32 port, u32 pin, u32 use_pullup);
+int atmel_pio4_set_g_periph(u32 port, u32 pin, u32 use_pullup);
+int atmel_pio4_set_pio_output(u32 port, u32 pin, u32 value);
+int atmel_pio4_get_pio_input(u32 port, u32 pin);
+
+#endif

drivers/gpio/Kconfig

@@ -28,6 +28,17 @@ config DWAPB_GPIO
 	help
 	  Support for the Designware APB GPIO driver.
 
+config ATMEL_PIO4
+	bool "ATMEL PIO4 driver"
+	depends on DM
+	default n
+	help
+	  Say yes here to support the Atmel PIO4 driver.
+	  The PIO4 is new version of Atmel PIO controller, which manages
+	  up to 128 fully programmable input/output lines. Each I/O line
+	  may be dedicated as a general purpose I/O or be assigned to
+	  a function of an embedded peripheral.
+
 config LPC32XX_GPIO
 	bool "LPC32XX GPIO driver"
 	depends on DM

drivers/gpio/Makefile

@@ -12,6 +12,7 @@ endif
 obj-$(CONFIG_DM_GPIO)		+= gpio-uclass.o
 
 obj-$(CONFIG_AT91_GPIO)	+= at91_gpio.o
+obj-$(CONFIG_ATMEL_PIO4)	+= atmel_pio4.o
 obj-$(CONFIG_INTEL_ICH6_GPIO)	+= intel_ich6_gpio.o
 obj-$(CONFIG_KIRKWOOD_GPIO)	+= kw_gpio.o
 obj-$(CONFIG_KONA_GPIO)	+= kona_gpio.o

drivers/gpio/atmel_pio4.c

@@ -0,0 +1,296 @@
+/*
+ * Atmel PIO4 device driver
+ *
+ * Copyright (C) 2015 Atmel Corporation
+ *		 Wenyou.Yang <wenyou.yang@atmel.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <dm.h>
+#include <asm/arch/hardware.h>
+#include <mach/gpio.h>
+#include <mach/atmel_pio4.h>
+
+#define ATMEL_PIO4_PINS_PER_BANK	32
+
+/*
+ * Register Field Definitions
+ */
+#define ATMEL_PIO4_CFGR_FUNC	(0x7 << 0)
+#define		ATMEL_PIO4_CFGR_FUNC_GPIO	(0x0 << 0)
+#define		ATMEL_PIO4_CFGR_FUNC_PERIPH_A	(0x1 << 0)
+#define		ATMEL_PIO4_CFGR_FUNC_PERIPH_B	(0x2 << 0)
+#define		ATMEL_PIO4_CFGR_FUNC_PERIPH_C	(0x3 << 0)
+#define		ATMEL_PIO4_CFGR_FUNC_PERIPH_D	(0x4 << 0)
+#define		ATMEL_PIO4_CFGR_FUNC_PERIPH_E	(0x5 << 0)
+#define		ATMEL_PIO4_CFGR_FUNC_PERIPH_F	(0x6 << 0)
+#define		ATMEL_PIO4_CFGR_FUNC_PERIPH_G	(0x7 << 0)
+#define ATMEL_PIO4_CFGR_DIR	(0x1 << 8)
+#define ATMEL_PIO4_CFGR_PUEN	(0x1 << 9)
+#define ATMEL_PIO4_CFGR_PDEN	(0x1 << 10)
+#define ATMEL_PIO4_CFGR_IFEN	(0x1 << 12)
+#define ATMEL_PIO4_CFGR_IFSCEN	(0x1 << 13)
+#define ATMEL_PIO4_CFGR_OPD	(0x1 << 14)
+#define ATMEL_PIO4_CFGR_SCHMITT	(0x1 << 15)
+#define ATMEL_PIO4_CFGR_DRVSTR	(0x3 << 16)
+#define		ATMEL_PIO4_CFGR_DRVSTR_LOW0	(0x0 << 16)
+#define		ATMEL_PIO4_CFGR_DRVSTR_LOW1	(0x1 << 16)
+#define		ATMEL_PIO4_CFGR_DRVSTR_MEDIUM	(0x2 << 16)
+#define		ATMEL_PIO4_CFGR_DRVSTR_HIGH	(0x3 << 16)
+#define ATMEL_PIO4_CFGR_EVTSEL	(0x7 << 24)
+#define		ATMEL_PIO4_CFGR_EVTSEL_FALLING	(0x0 << 24)
+#define		ATMEL_PIO4_CFGR_EVTSEL_RISING	(0x1 << 24)
+#define		ATMEL_PIO4_CFGR_EVTSEL_BOTH	(0x2 << 24)
+#define		ATMEL_PIO4_CFGR_EVTSEL_LOW	(0x3 << 24)
+#define		ATMEL_PIO4_CFGR_EVTSEL_HIGH	(0x4 << 24)
+#define ATMEL_PIO4_CFGR_PCFS	(0x1 << 29)
+#define ATMEL_PIO4_CFGR_ICFS	(0x1 << 30)
+
+static struct atmel_pio4_port *atmel_pio4_port_base(u32 port)
+{
+	struct atmel_pio4_port *base = NULL;
+
+	switch (port) {
+	case AT91_PIO_PORTA:
+		base = (struct atmel_pio4_port *)ATMEL_BASE_PIOA;
+		break;
+	case AT91_PIO_PORTB:
+		base = (struct atmel_pio4_port *)ATMEL_BASE_PIOB;
+		break;
+	case AT91_PIO_PORTC:
+		base = (struct atmel_pio4_port *)ATMEL_BASE_PIOC;
+		break;
+	case AT91_PIO_PORTD:
+		base = (struct atmel_pio4_port *)ATMEL_BASE_PIOD;
+		break;
+	default:
+		printf("Error: Atmel PIO4: Failed to get PIO base of port#%d!\n",
+		       port);
+		break;
+	}
+
+	return base;
+}
+
+static int atmel_pio4_config_io_func(u32 port, u32 pin,
+				     u32 func, u32 use_pullup)
+{
+	struct atmel_pio4_port *port_base;
+	u32 reg, mask;
+
+	if (pin >= ATMEL_PIO4_PINS_PER_BANK)
+		return -ENODEV;
+
+	port_base = atmel_pio4_port_base(port);
+	if (!port_base)
+		return -ENODEV;
+
+	mask = 1 << pin;
+	reg = func;
+	reg |= use_pullup ? ATMEL_PIO4_CFGR_PUEN : 0;
+
+	writel(mask, &port_base->mskr);
+	writel(reg, &port_base->cfgr);
+
+	return 0;
+}
+
+int atmel_pio4_set_gpio(u32 port, u32 pin, u32 use_pullup)
+{
+	return atmel_pio4_config_io_func(port, pin,
+					 ATMEL_PIO4_CFGR_FUNC_GPIO,
+					 use_pullup);
+}
+
+int atmel_pio4_set_a_periph(u32 port, u32 pin, u32 use_pullup)
+{
+	return atmel_pio4_config_io_func(port, pin,
+					 ATMEL_PIO4_CFGR_FUNC_PERIPH_A,
+					 use_pullup);
+}
+
+int atmel_pio4_set_b_periph(u32 port, u32 pin, u32 use_pullup)
+{
+	return atmel_pio4_config_io_func(port, pin,
+					 ATMEL_PIO4_CFGR_FUNC_PERIPH_B,
+					 use_pullup);
+}
+
+int atmel_pio4_set_c_periph(u32 port, u32 pin, u32 use_pullup)
+{
+	return atmel_pio4_config_io_func(port, pin,
+					 ATMEL_PIO4_CFGR_FUNC_PERIPH_C,
+					 use_pullup);
+}
+
+int atmel_pio4_set_d_periph(u32 port, u32 pin, u32 use_pullup)
+{
+	return atmel_pio4_config_io_func(port, pin,
+					 ATMEL_PIO4_CFGR_FUNC_PERIPH_D,
+					 use_pullup);
+}
+
+int atmel_pio4_set_e_periph(u32 port, u32 pin, u32 use_pullup)
+{
+	return atmel_pio4_config_io_func(port, pin,
+					 ATMEL_PIO4_CFGR_FUNC_PERIPH_E,
+					 use_pullup);
+}
+
+int atmel_pio4_set_f_periph(u32 port, u32 pin, u32 use_pullup)
+{
+	return atmel_pio4_config_io_func(port, pin,
+					 ATMEL_PIO4_CFGR_FUNC_PERIPH_F,
+					 use_pullup);
+}
+
+int atmel_pio4_set_g_periph(u32 port, u32 pin, u32 use_pullup)
+{
+	return atmel_pio4_config_io_func(port, pin,
+					 ATMEL_PIO4_CFGR_FUNC_PERIPH_G,
+					 use_pullup);
+}
+
+int atmel_pio4_set_pio_output(u32 port, u32 pin, u32 value)
+{
+	struct atmel_pio4_port *port_base;
+	u32 reg, mask;
+
+	if (pin >= ATMEL_PIO4_PINS_PER_BANK)
+		return -ENODEV;
+
+	port_base = atmel_pio4_port_base(port);
+	if (!port_base)
+		return -ENODEV;
+
+	mask = 0x01 << pin;
+	reg = ATMEL_PIO4_CFGR_FUNC_GPIO | ATMEL_PIO4_CFGR_DIR;
+
+	writel(mask, &port_base->mskr);
+	writel(reg, &port_base->cfgr);
+
+	if (value)
+		writel(mask, &port_base->sodr);
+	else
+		writel(mask, &port_base->codr);
+
+	return 0;
+}
+
+int atmel_pio4_get_pio_input(u32 port, u32 pin)
+{
+	struct atmel_pio4_port *port_base;
+	u32 reg, mask;
+
+	if (pin >= ATMEL_PIO4_PINS_PER_BANK)
+		return -ENODEV;
+
+	port_base = atmel_pio4_port_base(port);
+	if (!port_base)
+		return -ENODEV;
+
+	mask = 0x01 << pin;
+	reg = ATMEL_PIO4_CFGR_FUNC_GPIO;
+
+	writel(mask, &port_base->mskr);
+	writel(reg, &port_base->cfgr);
+
+	return (readl(&port_base->pdsr) & mask) ? 1 : 0;
+}
+
+#ifdef CONFIG_DM_GPIO
+static int atmel_pio4_direction_input(struct udevice *dev, unsigned offset)
+{
+	struct at91_port_platdata *plat = dev_get_platdata(dev);
+	struct atmel_pio4_port *port_base = (atmel_pio4_port *)plat->base_addr;
+	u32 mask = 0x01 << offset;
+	u32 reg = ATMEL_PIO4_CFGR_FUNC_GPIO;
+
+	writel(mask, &port_base->mskr);
+	writel(reg, &port_base->cfgr);
+
+	return 0;
+}
+
+static int atmel_pio4_direction_output(struct udevice *dev,
+				       unsigned offset, int value)
+{
+	struct at91_port_platdata *plat = dev_get_platdata(dev);
+	struct atmel_pio4_port *port_base = (atmel_pio4_port *)plat->base_addr;
+	u32 mask = 0x01 << offset;
+	u32 reg = ATMEL_PIO4_CFGR_FUNC_GPIO | ATMEL_PIO4_CFGR_DIR;
+
+	writel(mask, &port_base->mskr);
+	writel(reg, &port_base->cfgr);
+
+	if (value)
+		writel(mask, &port_base->sodr);
+	else
+		writel(mask, &port_base->codr);
+
+	return 0;
+}
+
+static int atmel_pio4_get_value(struct udevice *dev, unsigned offset)
+{
+	struct at91_port_platdata *plat = dev_get_platdata(dev);
+	struct atmel_pio4_port *port_base = (atmel_pio4_port *)plat->base_addr;
+	u32 mask = 0x01 << offset;
+
+	return (readl(&port_base->pdsr) & mask) ? 1 : 0;
+}
+
+static int atmel_pio4_set_value(struct udevice *dev,
+				unsigned offset, int value)
+{
+	struct at91_port_platdata *plat = dev_get_platdata(dev);
+	struct atmel_pio4_port *port_base = (atmel_pio4_port *)plat->base_addr;
+	u32 mask = 0x01 << offset;
+
+	if (value)
+		writel(mask, &port_base->sodr);
+	else
+		writel(mask, &port_base->codr);
+
+	return 0;
+}
+
+static int atmel_pio4_get_function(struct udevice *dev, unsigned offset)
+{
+	struct at91_port_platdata *plat = dev_get_platdata(dev);
+	struct atmel_pio4_port *port_base = (atmel_pio4_port *)plat->base_addr;
+	u32 mask = 0x01 << offset;
+
+	writel(mask, &port_base->mskr);
+
+	return (readl(&port_base->cfgr) &
+		ATMEL_PIO4_CFGR_DIR) ? GPIOF_OUTPUT : GPIOF_INPUT;
+}
+
+static const struct dm_gpio_ops atmel_pio4_ops = {
+	.direction_input	= atmel_pio4_direction_input,
+	.direction_output	= atmel_pio4_direction_output,
+	.get_value		= atmel_pio4_get_value,
+	.set_value		= atmel_pio4_set_value,
+	.get_function		= atmel_pio4_get_function,
+};
+
+static int atmel_pio4_probe(struct udevice *dev)
+{
+	struct at91_port_platdata *plat = dev_get_platdata(dev);
+	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+
+	uc_priv->bank_name = plat->bank_name;
+	uc_priv->gpio_count = ATMEL_PIO4_PINS_PER_BANK;
+
+	return 0;
+}
+
+U_BOOT_DRIVER(gpio_atmel_pio4) = {
+	.name	= "gpio_atmel_pio4",
+	.id	= UCLASS_GPIO,
+	.ops	= &atmel_pio4_ops,
+	.probe	= atmel_pio4_probe,
+};
+#endif