Message-Id: <1306767139-24763-5-git-send-email-shawn.guo@linaro.org>
Date:	Mon, 30 May 2011 22:52:19 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	linux-kernel@...r.kernel.org
Cc:	grant.likely@...retlab.ca, arnd@...db.de, kernel@...gutronix.de,
	linux-arm-kernel@...ts.infradead.org, patches@...aro.org,
	Shawn Guo <shawn.guo@...aro.org>
Subject: [PATCH 4/4] ARM: mxc: remove plat-mxc/gpio driver

With all users of plat-mxc/gpio migrated to drivers/gpio/gpio-mxc,
plat-mxc/gpio can be removed now.  And plat-mxc/include/mach/gpio.h
can also be cleaned up as below.

 * Remove the helper macros for gpio ports definition
 * Move "struct mxc_gpio_port" into drivers/gpio/gpio-mxc.c, as it's
   not needed to be public at all

Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
---
 arch/arm/plat-mxc/Makefile            |    2 +-
 arch/arm/plat-mxc/gpio.c              |  361 ---------------------------------
 arch/arm/plat-mxc/include/mach/gpio.h |   29 ---
 drivers/gpio/gpio-mxc.c               |   12 +
 4 files changed, 13 insertions(+), 391 deletions(-)
 delete mode 100644 arch/arm/plat-mxc/gpio.c

diff --git a/arch/arm/plat-mxc/Makefile b/arch/arm/plat-mxc/Makefile
index a138787..d53c35f 100644
--- a/arch/arm/plat-mxc/Makefile
+++ b/arch/arm/plat-mxc/Makefile
@@ -3,7 +3,7 @@
 #
 
 # Common support
-obj-y := clock.o gpio.o time.o devices.o cpu.o system.o irq-common.o
+obj-y := clock.o time.o devices.o cpu.o system.o irq-common.o
 
 # MX51 uses the TZIC interrupt controller, older platforms use AVIC
 obj-$(CONFIG_MXC_TZIC) += tzic.o
diff --git a/arch/arm/plat-mxc/gpio.c b/arch/arm/plat-mxc/gpio.c
deleted file mode 100644
index 6cd6d7f..0000000
--- a/arch/arm/plat-mxc/gpio.c
+++ /dev/null
@@ -1,361 +0,0 @@
-/*
- * MXC GPIO support. (c) 2008 Daniel Mack <daniel@...aq.de>
- * Copyright 2008 Juergen Beisert, kernel@...gutronix.de
- *
- * Based on code from Freescale,
- * Copyright (C) 2004-2010 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/interrupt.h>
-#include <linux/io.h>
-#include <linux/irq.h>
-#include <linux/gpio.h>
-#include <mach/hardware.h>
-#include <asm-generic/bug.h>
-
-static struct mxc_gpio_port *mxc_gpio_ports;
-static int gpio_table_size;
-
-#define cpu_is_mx1_mx2()	(cpu_is_mx1() || cpu_is_mx2())
-
-#define GPIO_DR		(cpu_is_mx1_mx2() ? 0x1c : 0x00)
-#define GPIO_GDIR	(cpu_is_mx1_mx2() ? 0x00 : 0x04)
-#define GPIO_PSR	(cpu_is_mx1_mx2() ? 0x24 : 0x08)
-#define GPIO_ICR1	(cpu_is_mx1_mx2() ? 0x28 : 0x0C)
-#define GPIO_ICR2	(cpu_is_mx1_mx2() ? 0x2C : 0x10)
-#define GPIO_IMR	(cpu_is_mx1_mx2() ? 0x30 : 0x14)
-#define GPIO_ISR	(cpu_is_mx1_mx2() ? 0x34 : 0x18)
-
-#define GPIO_INT_LOW_LEV	(cpu_is_mx1_mx2() ? 0x3 : 0x0)
-#define GPIO_INT_HIGH_LEV	(cpu_is_mx1_mx2() ? 0x2 : 0x1)
-#define GPIO_INT_RISE_EDGE	(cpu_is_mx1_mx2() ? 0x0 : 0x2)
-#define GPIO_INT_FALL_EDGE	(cpu_is_mx1_mx2() ? 0x1 : 0x3)
-#define GPIO_INT_NONE		0x4
-
-/* 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(struct irq_data *d)
-{
-	u32 gpio = irq_to_gpio(d->irq);
-	_clear_gpio_irqstatus(&mxc_gpio_ports[gpio / 32], gpio & 0x1f);
-}
-
-static void gpio_mask_irq(struct irq_data *d)
-{
-	u32 gpio = irq_to_gpio(d->irq);
-	_set_gpio_irqenable(&mxc_gpio_ports[gpio / 32], gpio & 0x1f, 0);
-}
-
-static void gpio_unmask_irq(struct irq_data *d)
-{
-	u32 gpio = irq_to_gpio(d->irq);
-	_set_gpio_irqenable(&mxc_gpio_ports[gpio / 32], gpio & 0x1f, 1);
-}
-
-static int mxc_gpio_get(struct gpio_chip *chip, unsigned offset);
-
-static int gpio_set_irq_type(struct irq_data *d, u32 type)
-{
-	u32 gpio = irq_to_gpio(d->irq);
-	struct mxc_gpio_port *port = &mxc_gpio_ports[gpio / 32];
-	u32 bit, val;
-	int edge;
-	void __iomem *reg = port->base;
-
-	port->both_edges &= ~(1 << (gpio & 31));
-	switch (type) {
-	case IRQ_TYPE_EDGE_RISING:
-		edge = GPIO_INT_RISE_EDGE;
-		break;
-	case IRQ_TYPE_EDGE_FALLING:
-		edge = GPIO_INT_FALL_EDGE;
-		break;
-	case IRQ_TYPE_EDGE_BOTH:
-		val = mxc_gpio_get(&port->chip, gpio & 31);
-		if (val) {
-			edge = GPIO_INT_LOW_LEV;
-			pr_debug("mxc: set GPIO %d to low trigger\n", gpio);
-		} else {
-			edge = GPIO_INT_HIGH_LEV;
-			pr_debug("mxc: set GPIO %d to high trigger\n", gpio);
-		}
-		port->both_edges |= 1 << (gpio & 31);
-		break;
-	case IRQ_TYPE_LEVEL_LOW:
-		edge = GPIO_INT_LOW_LEV;
-		break;
-	case IRQ_TYPE_LEVEL_HIGH:
-		edge = GPIO_INT_HIGH_LEV;
-		break;
-	default:
-		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;
-}
-
-static void mxc_flip_edge(struct mxc_gpio_port *port, u32 gpio)
-{
-	void __iomem *reg = port->base;
-	u32 bit, val;
-	int edge;
-
-	reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */
-	bit = gpio & 0xf;
-	val = __raw_readl(reg);
-	edge = (val >> (bit << 1)) & 3;
-	val &= ~(0x3 << (bit << 1));
-	if (edge == GPIO_INT_HIGH_LEV) {
-		edge = GPIO_INT_LOW_LEV;
-		pr_debug("mxc: switch GPIO %d to low trigger\n", gpio);
-	} else if (edge == GPIO_INT_LOW_LEV) {
-		edge = GPIO_INT_HIGH_LEV;
-		pr_debug("mxc: switch GPIO %d to high trigger\n", gpio);
-	} else {
-		pr_err("mxc: invalid configuration for GPIO %d: %x\n",
-		       gpio, edge);
-		return;
-	}
-	__raw_writel(val | (edge << (bit << 1)), reg);
-}
-
-/* handle 32 interrupts in one status register */
-static void mxc_gpio_irq_handler(struct mxc_gpio_port *port, u32 irq_stat)
-{
-	u32 gpio_irq_no_base = port->virtual_irq_start;
-
-	while (irq_stat != 0) {
-		int irqoffset = fls(irq_stat) - 1;
-
-		if (port->both_edges & (1 << irqoffset))
-			mxc_flip_edge(port, irqoffset);
-
-		generic_handle_irq(gpio_irq_no_base + irqoffset);
-
-		irq_stat &= ~(1 << irqoffset);
-	}
-}
-
-/* MX1 and 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 = irq_get_handler_data(irq);
-
-	irq_stat = __raw_readl(port->base + GPIO_ISR) &
-			__raw_readl(port->base + GPIO_IMR);
-
-	mxc_gpio_irq_handler(port, irq_stat);
-}
-
-/* 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 = irq_get_handler_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);
-	}
-}
-
-/*
- * Set interrupt number "irq" in the GPIO as a wake-up source.
- * While system is running, all registered GPIO interrupts need to have
- * wake-up enabled. When system is suspended, only selected GPIO interrupts
- * need to have wake-up enabled.
- * @param  irq          interrupt source number
- * @param  enable       enable as wake-up if equal to non-zero
- * @return       This function returns 0 on success.
- */
-static int gpio_set_wake_irq(struct irq_data *d, u32 enable)
-{
-	u32 gpio = irq_to_gpio(d->irq);
-	u32 gpio_idx = gpio & 0x1F;
-	struct mxc_gpio_port *port = &mxc_gpio_ports[gpio / 32];
-
-	if (enable) {
-		if (port->irq_high && (gpio_idx >= 16))
-			enable_irq_wake(port->irq_high);
-		else
-			enable_irq_wake(port->irq);
-	} else {
-		if (port->irq_high && (gpio_idx >= 16))
-			disable_irq_wake(port->irq_high);
-		else
-			disable_irq_wake(port->irq);
-	}
-
-	return 0;
-}
-
-static struct irq_chip gpio_irq_chip = {
-	.name = "GPIO",
-	.irq_ack = gpio_ack_irq,
-	.irq_mask = gpio_mask_irq,
-	.irq_unmask = gpio_unmask_irq,
-	.irq_set_type = gpio_set_irq_type,
-	.irq_set_wake = gpio_set_wake_irq,
-};
-
-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;
-	unsigned long flags;
-
-	spin_lock_irqsave(&port->lock, flags);
-	l = __raw_readl(port->base + GPIO_GDIR);
-	if (dir)
-		l |= 1 << offset;
-	else
-		l &= ~(1 << offset);
-	__raw_writel(l, port->base + GPIO_GDIR);
-	spin_unlock_irqrestore(&port->lock, flags);
-}
-
-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;
-	unsigned long flags;
-
-	spin_lock_irqsave(&port->lock, flags);
-	l = (__raw_readl(reg) & (~(1 << offset))) | (!!value << offset);
-	__raw_writel(l, reg);
-	spin_unlock_irqrestore(&port->lock, flags);
-}
-
-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_PSR) >> 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)
-{
-	mxc_gpio_set(chip, offset, value);
-	_set_gpio_direction(chip, offset, 1);
-	return 0;
-}
-
-/*
- * This lock class tells lockdep that GPIO irqs are in a different
- * category than their parents, so it won't report false recursion.
- */
-static struct lock_class_key gpio_lock_class;
-
-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++) {
-			irq_set_lockdep_class(j, &gpio_lock_class);
-			irq_set_chip_and_handler(j, &gpio_irq_chip,
-						 handle_level_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;
-
-		spin_lock_init(&port[i].lock);
-
-		/* its a serious configuration bug when it fails */
-		BUG_ON( gpiochip_add(&port[i].chip) < 0 );
-
-		if (cpu_is_mx1() || cpu_is_mx3() || cpu_is_mx25() || cpu_is_mx51()) {
-			/* setup one handler for each entry */
-			irq_set_chained_handler(port[i].irq,
-						mx3_gpio_irq_handler);
-			irq_set_handler_data(port[i].irq, &port[i]);
-			if (port[i].irq_high) {
-				/* setup handler for GPIO 16 to 31 */
-				irq_set_chained_handler(port[i].irq_high,
-							mx3_gpio_irq_handler);
-				irq_set_handler_data(port[i].irq_high,
-						     &port[i]);
-			}
-		}
-	}
-
-	if (cpu_is_mx2()) {
-		/* setup one handler for all GPIO interrupts */
-		irq_set_chained_handler(port[0].irq, mx2_gpio_irq_handler);
-		irq_set_handler_data(port[0].irq, port);
-	}
-
-	return 0;
-}
diff --git a/arch/arm/plat-mxc/include/mach/gpio.h b/arch/arm/plat-mxc/include/mach/gpio.h
index 87bd4ef..31c820c 100644
--- a/arch/arm/plat-mxc/include/mach/gpio.h
+++ b/arch/arm/plat-mxc/include/mach/gpio.h
@@ -36,33 +36,4 @@
 #define gpio_to_irq(gpio)	(MXC_GPIO_IRQ_START + (gpio))
 #define irq_to_gpio(irq)	((irq) - MXC_GPIO_IRQ_START)
 
-struct mxc_gpio_port {
-	struct list_head node;
-	void __iomem *base;
-	int id;
-	int irq;
-	int irq_high;
-	int virtual_irq_start;
-	struct gpio_chip chip;
-	u32 both_edges;
-	spinlock_t lock;
-};
-
-#define DEFINE_IMX_GPIO_PORT_IRQ_HIGH(soc, _id, _hwid, _irq, _irq_high)	\
-	{								\
-		.chip.label = "gpio-" #_id,				\
-		.irq = _irq,						\
-		.irq_high = _irq_high,					\
-		.base = soc ## _IO_ADDRESS(				\
-				soc ## _GPIO ## _hwid ## _BASE_ADDR),	\
-		.virtual_irq_start = MXC_GPIO_IRQ_START + (_id) * 32,	\
-	}
-
-#define DEFINE_IMX_GPIO_PORT_IRQ(soc, _id, _hwid, _irq)			\
-	DEFINE_IMX_GPIO_PORT_IRQ_HIGH(soc, _id, _hwid, _irq, 0)
-#define DEFINE_IMX_GPIO_PORT(soc, _id, _hwid)				\
-	DEFINE_IMX_GPIO_PORT_IRQ(soc, _id, _hwid, 0)
-
-int mxc_gpio_init(struct mxc_gpio_port*, int);
-
 #endif
diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
index df3df3f..065b5c0 100644
--- a/drivers/gpio/gpio-mxc.c
+++ b/drivers/gpio/gpio-mxc.c
@@ -29,6 +29,18 @@
 #include <mach/hardware.h>
 #include <asm-generic/bug.h>
 
+struct mxc_gpio_port {
+	struct list_head node;
+	void __iomem *base;
+	int id;
+	int irq;
+	int irq_high;
+	int virtual_irq_start;
+	struct gpio_chip chip;
+	u32 both_edges;
+	spinlock_t lock;
+};
+
 /*
  * MX2 has one interrupt *for all* gpio ports. The list is used
  * to save the references to all ports, so that mx2_gpio_irq_handler
-- 
1.7.4.1

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