---

yaml
---
r: 100873
b: refs/heads/master
c: 07bd1a6
h: refs/heads/master
i:
  100871: 8a4daa9
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e3d13ff4b9d3b05d7a969153e2c049548e25deea
+refs/heads/master: 07bd1a6cc7cbb3f373fbe49b204c6cde5e9155fc

trunk/arch/arm/Kconfig

@@ -368,6 +368,8 @@ config ARCH_NS9XXX
 config ARCH_MXC
 	bool "Freescale MXC/iMX-based"
 	select ARCH_MTD_XIP
+	select GENERIC_GPIO
+	select HAVE_GPIO_LIB
 	help
 	  Support for Freescale MXC/iMX-based family of processors
 

trunk/arch/arm/mach-mx3/devices.c

@@ -20,6 +20,7 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/serial.h>
+#include <linux/gpio.h>
 #include <asm/hardware.h>
 #include <asm/arch/imx-uart.h>
 
@@ -151,3 +152,29 @@ int __init imx_init_uart(int uart_no, struct imxuart_platform_data *pdata)
 	return 0;
 }
 
+/* GPIO port description */
+static struct mxc_gpio_port imx_gpio_ports[] = {
+	[0] = {
+		.chip.label = "gpio-0",
+		.base = IO_ADDRESS(GPIO1_BASE_ADDR),
+		.irq = MXC_INT_GPIO1,
+		.virtual_irq_start = MXC_GPIO_INT_BASE
+	},
+	[1] = {
+		.chip.label = "gpio-1",
+		.base = IO_ADDRESS(GPIO2_BASE_ADDR),
+		.irq = MXC_INT_GPIO2,
+		.virtual_irq_start = MXC_GPIO_INT_BASE + GPIO_NUM_PIN
+	},
+	[2] = {
+		.chip.label = "gpio-2",
+		.base = IO_ADDRESS(GPIO3_BASE_ADDR),
+		.irq = MXC_INT_GPIO3,
+		.virtual_irq_start = MXC_GPIO_INT_BASE + GPIO_NUM_PIN * 2
+	}
+};
+
+int __init mxc_register_gpios(void)
+{
+	return mxc_gpio_init(imx_gpio_ports, ARRAY_SIZE(imx_gpio_ports));
+}

trunk/arch/arm/plat-mxc/Makefile

@@ -3,4 +3,4 @@
 #
 
 # Common support
-obj-y := irq.o clock.o
+obj-y := irq.o clock.o gpio.o

trunk/arch/arm/plat-mxc/gpio.c

@@ -0,0 +1,253 @@
+/*
+ * MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de>
+ * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
+ *
+ * Based on code from Freescale,
+ * Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/gpio.h>
+#include <asm/hardware.h>
+#include <asm-generic/bug.h>
+
+static struct mxc_gpio_port *mxc_gpio_ports;
+static int gpio_table_size;
+
+/* Note: This driver assumes 32 GPIOs are handled in one register */
+
+static void _clear_gpio_irqstatus(struct mxc_gpio_port *port, u32 index)
+{
+	__raw_writel(1 << index, port->base + GPIO_ISR);
+}
+
+static void _set_gpio_irqenable(struct mxc_gpio_port *port, u32 index,
+				int enable)
+{
+	u32 l;
+
+	l = __raw_readl(port->base + GPIO_IMR);
+	l = (l & (~(1 << index))) | (!!enable << index);
+	__raw_writel(l, port->base + GPIO_IMR);
+}
+
+static void gpio_ack_irq(u32 irq)
+{
+	u32 gpio = irq_to_gpio(irq);
+	_clear_gpio_irqstatus(&mxc_gpio_ports[gpio / 32], gpio & 0x1f);
+}
+
+static void gpio_mask_irq(u32 irq)
+{
+	u32 gpio = irq_to_gpio(irq);
+	_set_gpio_irqenable(&mxc_gpio_ports[gpio / 32], gpio & 0x1f, 0);
+}
+
+static void gpio_unmask_irq(u32 irq)
+{
+	u32 gpio = irq_to_gpio(irq);
+	_set_gpio_irqenable(&mxc_gpio_ports[gpio / 32], gpio & 0x1f, 1);
+}
+
+static int gpio_set_irq_type(u32 irq, u32 type)
+{
+	u32 gpio = irq_to_gpio(irq);
+	struct mxc_gpio_port *port = &mxc_gpio_ports[gpio / 32];
+	u32 bit, val;
+	int edge;
+	void __iomem *reg = port->base;
+
+	switch (type) {
+	case IRQT_RISING:
+		edge = GPIO_INT_RISE_EDGE;
+		break;
+	case IRQT_FALLING:
+		edge = GPIO_INT_FALL_EDGE;
+		break;
+	case IRQT_LOW:
+		edge = GPIO_INT_LOW_LEV;
+		break;
+	case IRQT_HIGH:
+		edge = GPIO_INT_HIGH_LEV;
+		break;
+	default:	/* this includes IRQT_BOTHEDGE */
+		return -EINVAL;
+	}
+
+	reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */
+	bit = gpio & 0xf;
+	val = __raw_readl(reg) & ~(0x3 << (bit << 1));
+	__raw_writel(val | (edge << (bit << 1)), reg);
+	_clear_gpio_irqstatus(port, gpio & 0x1f);
+
+	return 0;
+}
+
+/* handle n interrupts in one status register */
+static void mxc_gpio_irq_handler(struct mxc_gpio_port *port, u32 irq_stat)
+{
+	u32 gpio_irq_no;
+
+	gpio_irq_no = port->virtual_irq_start;
+	for (; irq_stat != 0; irq_stat >>= 1, gpio_irq_no++) {
+
+		if ((irq_stat & 1) == 0)
+			continue;
+
+		BUG_ON(!(irq_desc[gpio_irq_no].handle_irq));
+		irq_desc[gpio_irq_no].handle_irq(gpio_irq_no,
+				&irq_desc[gpio_irq_no]);
+	}
+}
+
+#ifdef CONFIG_ARCH_MX3
+/* MX3 has one interrupt *per* gpio port */
+static void mx3_gpio_irq_handler(u32 irq, struct irq_desc *desc)
+{
+	u32 irq_stat;
+	struct mxc_gpio_port *port = (struct mxc_gpio_port *)get_irq_data(irq);
+
+	irq_stat = __raw_readl(port->base + GPIO_ISR) &
+			__raw_readl(port->base + GPIO_IMR);
+	BUG_ON(!irq_stat);
+	mxc_gpio_irq_handler(port, irq_stat);
+}
+#endif
+
+#ifdef CONFIG_ARCH_MX2
+/* MX2 has one interrupt *for all* gpio ports */
+static void mx2_gpio_irq_handler(u32 irq, struct irq_desc *desc)
+{
+	int i;
+	u32 irq_msk, irq_stat;
+	struct mxc_gpio_port *port = (struct mxc_gpio_port *)get_irq_data(irq);
+
+	/* walk through all interrupt status registers */
+	for (i = 0; i < gpio_table_size; i++) {
+		irq_msk = __raw_readl(port[i].base + GPIO_IMR);
+		if (!irq_msk)
+			continue;
+
+		irq_stat = __raw_readl(port[i].base + GPIO_ISR) & irq_msk;
+		if (irq_stat)
+			mxc_gpio_irq_handler(&port[i], irq_stat);
+	}
+}
+#endif
+
+static struct irq_chip gpio_irq_chip = {
+	.ack = gpio_ack_irq,
+	.mask = gpio_mask_irq,
+	.unmask = gpio_unmask_irq,
+	.set_type = gpio_set_irq_type,
+};
+
+static void _set_gpio_direction(struct gpio_chip *chip, unsigned offset,
+				int dir)
+{
+	struct mxc_gpio_port *port =
+		container_of(chip, struct mxc_gpio_port, chip);
+	u32 l;
+
+	l = __raw_readl(port->base + GPIO_GDIR);
+	if (dir)
+		l |= 1 << offset;
+	else
+		l &= ~(1 << offset);
+	__raw_writel(l, port->base + GPIO_GDIR);
+}
+
+static void mxc_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	struct mxc_gpio_port *port =
+		container_of(chip, struct mxc_gpio_port, chip);
+	void __iomem *reg = port->base + GPIO_DR;
+	u32 l;
+
+	l = (__raw_readl(reg) & (~(1 << offset))) | (value << offset);
+	__raw_writel(l, reg);
+}
+
+static int mxc_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct mxc_gpio_port *port =
+		container_of(chip, struct mxc_gpio_port, chip);
+
+	return (__raw_readl(port->base + GPIO_DR) >> offset) & 1;
+}
+
+static int mxc_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+	_set_gpio_direction(chip, offset, 0);
+	return 0;
+}
+
+static int mxc_gpio_direction_output(struct gpio_chip *chip,
+				     unsigned offset, int value)
+{
+	_set_gpio_direction(chip, offset, 1);
+	mxc_gpio_set(chip, offset, value);
+	return 0;
+}
+
+int __init mxc_gpio_init(struct mxc_gpio_port *port, int cnt)
+{
+	int i, j;
+
+	/* save for local usage */
+	mxc_gpio_ports = port;
+	gpio_table_size = cnt;
+
+	printk(KERN_INFO "MXC GPIO hardware\n");
+
+	for (i = 0; i < cnt; i++) {
+		/* disable the interrupt and clear the status */
+		__raw_writel(0, port[i].base + GPIO_IMR);
+		__raw_writel(~0, port[i].base + GPIO_ISR);
+		for (j = port[i].virtual_irq_start;
+			j < port[i].virtual_irq_start + 32; j++) {
+			set_irq_chip(j, &gpio_irq_chip);
+			set_irq_handler(j, handle_edge_irq);
+			set_irq_flags(j, IRQF_VALID);
+		}
+
+		/* register gpio chip */
+		port[i].chip.direction_input = mxc_gpio_direction_input;
+		port[i].chip.direction_output = mxc_gpio_direction_output;
+		port[i].chip.get = mxc_gpio_get;
+		port[i].chip.set = mxc_gpio_set;
+		port[i].chip.base = i * 32;
+		port[i].chip.ngpio = 32;
+
+		/* its a serious configuration bug when it fails */
+		BUG_ON( gpiochip_add(&port[i].chip) < 0 );
+
+#ifdef CONFIG_ARCH_MX3
+		/* setup one handler for each entry */
+		set_irq_chained_handler(port[i].irq, mx3_gpio_irq_handler);
+		set_irq_data(port[i].irq, &port[i]);
+#endif
+	}
+
+#ifdef CONFIG_ARCH_MX2
+	/* setup one handler for all GPIO interrupts */
+	set_irq_chained_handler(port[0].irq, mx2_gpio_irq_handler);
+	set_irq_data(port[0].irq, port);
+#endif
+	return 0;
+}

trunk/arch/arm/plat-mxc/irq.c

@@ -71,5 +71,8 @@ void __init mxc_init_irq(void)
 	reg |= (0xF << 28);
 	__raw_writel(reg, AVIC_NIPRIORITY6);
 
+	/* init architectures chained interrupt handler */
+	mxc_register_gpios();
+
 	printk(KERN_INFO "MXC IRQ initialized\n");
 }

trunk/include/asm-arm/arch-mxc/common.h

@@ -17,5 +17,6 @@ extern void mxc_map_io(void);
 extern void mxc_init_irq(void);
 extern struct sys_timer mxc_timer;
 extern int mxc_clocks_init(unsigned long fref);
+extern int mxc_register_gpios(void);
 
 #endif

trunk/include/asm-arm/arch-mxc/gpio.h

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2007 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#ifndef __ASM_ARCH_MXC_GPIO_H__
+#define __ASM_ARCH_MXC_GPIO_H__
+
+#include <asm/hardware.h>
+#include <asm-generic/gpio.h>
+
+/* use gpiolib dispatchers */
+#define gpio_get_value		__gpio_get_value
+#define gpio_set_value		__gpio_set_value
+#define gpio_cansleep		__gpio_cansleep
+
+#define gpio_to_irq(gpio)	(MXC_MAX_INT_LINES + (gpio))
+#define irq_to_gpio(irq)	((irq) - MXC_MAX_INT_LINES)
+
+struct mxc_gpio_port {
+	void __iomem *base;
+	int irq;
+	int virtual_irq_start;
+	struct gpio_chip chip;
+};
+
+int mxc_gpio_init(struct mxc_gpio_port*, int);
+
+#endif

trunk/include/asm-arm/arch-mxc/mx31.h

@@ -347,6 +347,25 @@
 #define SYSTEM_REV_MIN		CHIP_REV_1_0
 #define SYSTEM_REV_NUM		3
 
+/* gpio and gpio based interrupt handling */
+#define GPIO_DR		 	0x00
+#define GPIO_GDIR	 	0x04
+#define GPIO_PSR	 	0x08
+#define GPIO_ICR1	 	0x0C
+#define GPIO_ICR2	 	0x10
+#define GPIO_IMR	 	0x14
+#define GPIO_ISR	 	0x18
+#define GPIO_INT_LOW_LEV	0x0
+#define GPIO_INT_HIGH_LEV	0x1
+#define GPIO_INT_RISE_EDGE	0x2
+#define GPIO_INT_FALL_EDGE	0x3
+#define GPIO_INT_NONE		0x4
+
+/* Mandatory defines used globally */
+
+/* this CPU supports up to 96 GPIOs */
+#define ARCH_NR_GPIOS		96
+
 #if !defined(__ASSEMBLY__) && !defined(__MXC_BOOT_UNCOMPRESS)
 
 /* this is a i.MX31 CPU */