gpio/ep93xx: move driver to drivers/gpio

The GPIO driver should reside in drivers/gpio.

v3: Change Kconfig option to def_bool y
v2: Make the Kconfig symbol a silent option, dependent on ARCH_EP93XX

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

2 files changed, 1 insertions, 411 deletions

diff --git a/arch/arm/mach-ep93xx/Makefile b/arch/arm/mach-ep93xx/Makefile
index 33ee2c863d18..6b7c41d155df 100644
--- a/arch/arm/mach-ep93xx/Makefile
+++ b/arch/arm/mach-ep93xx/Makefile
@@ -1,7 +1,7 @@
 #
 # Makefile for the linux kernel.
 #
-obj-y			:= core.o clock.o dma-m2p.o gpio.o
+obj-y			:= core.o clock.o dma-m2p.o
 obj-m			:=
 obj-n			:=
 obj-			:=
diff --git a/arch/arm/mach-ep93xx/gpio.c b/arch/arm/mach-ep93xx/gpio.c
deleted file mode 100644
index 415dce37b88c..000000000000
--- a/arch/arm/mach-ep93xx/gpio.c
+++ /dev/null
@@ -1,410 +0,0 @@
-/*
- * linux/arch/arm/mach-ep93xx/gpio.c
- *
- * Generic EP93xx GPIO handling
- *
- * Copyright (c) 2008 Ryan Mallon <ryan@bluewatersys.com>
- *
- * Based on code originally from:
- *  linux/arch/arm/mach-ep93xx/core.c
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License version 2 as
- *  published by the Free Software Foundation.
- */
-
-#define pr_fmt(fmt) "ep93xx " KBUILD_MODNAME ": " fmt
-
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/seq_file.h>
-#include <linux/io.h>
-#include <linux/gpio.h>
-#include <linux/irq.h>
-
-#include <mach/hardware.h>
-
-/*************************************************************************
- * Interrupt handling for EP93xx on-chip GPIOs
- *************************************************************************/
-static unsigned char gpio_int_unmasked[3];
-static unsigned char gpio_int_enabled[3];
-static unsigned char gpio_int_type1[3];
-static unsigned char gpio_int_type2[3];
-static unsigned char gpio_int_debounce[3];
-
-/* Port ordering is: A B F */
-static const u8 int_type1_register_offset[3]	= { 0x90, 0xac, 0x4c };
-static const u8 int_type2_register_offset[3]	= { 0x94, 0xb0, 0x50 };
-static const u8 eoi_register_offset[3]		= { 0x98, 0xb4, 0x54 };
-static const u8 int_en_register_offset[3]	= { 0x9c, 0xb8, 0x58 };
-static const u8 int_debounce_register_offset[3]	= { 0xa8, 0xc4, 0x64 };
-
-static void ep93xx_gpio_update_int_params(unsigned port)
-{
-	BUG_ON(port > 2);
-
-	__raw_writeb(0, EP93XX_GPIO_REG(int_en_register_offset[port]));
-
-	__raw_writeb(gpio_int_type2[port],
-		EP93XX_GPIO_REG(int_type2_register_offset[port]));
-
-	__raw_writeb(gpio_int_type1[port],
-		EP93XX_GPIO_REG(int_type1_register_offset[port]));
-
-	__raw_writeb(gpio_int_unmasked[port] & gpio_int_enabled[port],
-		EP93XX_GPIO_REG(int_en_register_offset[port]));
-}
-
-static inline void ep93xx_gpio_int_mask(unsigned line)
-{
-	gpio_int_unmasked[line >> 3] &= ~(1 << (line & 7));
-}
-
-static void ep93xx_gpio_int_debounce(unsigned int irq, bool enable)
-{
-	int line = irq_to_gpio(irq);
-	int port = line >> 3;
-	int port_mask = 1 << (line & 7);
-
-	if (enable)
-		gpio_int_debounce[port] |= port_mask;
-	else
-		gpio_int_debounce[port] &= ~port_mask;
-
-	__raw_writeb(gpio_int_debounce[port],
-		EP93XX_GPIO_REG(int_debounce_register_offset[port]));
-}
-
-static void ep93xx_gpio_ab_irq_handler(unsigned int irq, struct irq_desc *desc)
-{
-	unsigned char status;
-	int i;
-
-	status = __raw_readb(EP93XX_GPIO_A_INT_STATUS);
-	for (i = 0; i < 8; i++) {
-		if (status & (1 << i)) {
-			int gpio_irq = gpio_to_irq(EP93XX_GPIO_LINE_A(0)) + i;
-			generic_handle_irq(gpio_irq);
-		}
-	}
-
-	status = __raw_readb(EP93XX_GPIO_B_INT_STATUS);
-	for (i = 0; i < 8; i++) {
-		if (status & (1 << i)) {
-			int gpio_irq = gpio_to_irq(EP93XX_GPIO_LINE_B(0)) + i;
-			generic_handle_irq(gpio_irq);
-		}
-	}
-}
-
-static void ep93xx_gpio_f_irq_handler(unsigned int irq, struct irq_desc *desc)
-{
-	/*
-	 * map discontiguous hw irq range to continuous sw irq range:
-	 *
-	 *  IRQ_EP93XX_GPIO{0..7}MUX -> gpio_to_irq(EP93XX_GPIO_LINE_F({0..7})
-	 */
-	int port_f_idx = ((irq + 1) & 7) ^ 4; /* {19..22,47..50} -> {0..7} */
-	int gpio_irq = gpio_to_irq(EP93XX_GPIO_LINE_F(0)) + port_f_idx;
-
-	generic_handle_irq(gpio_irq);
-}
-
-static void ep93xx_gpio_irq_ack(struct irq_data *d)
-{
-	int line = irq_to_gpio(d->irq);
-	int port = line >> 3;
-	int port_mask = 1 << (line & 7);
-
-	if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH) {
-		gpio_int_type2[port] ^= port_mask; /* switch edge direction */
-		ep93xx_gpio_update_int_params(port);
-	}
-
-	__raw_writeb(port_mask, EP93XX_GPIO_REG(eoi_register_offset[port]));
-}
-
-static void ep93xx_gpio_irq_mask_ack(struct irq_data *d)
-{
-	int line = irq_to_gpio(d->irq);
-	int port = line >> 3;
-	int port_mask = 1 << (line & 7);
-
-	if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH)
-		gpio_int_type2[port] ^= port_mask; /* switch edge direction */
-
-	gpio_int_unmasked[port] &= ~port_mask;
-	ep93xx_gpio_update_int_params(port);
-
-	__raw_writeb(port_mask, EP93XX_GPIO_REG(eoi_register_offset[port]));
-}
-
-static void ep93xx_gpio_irq_mask(struct irq_data *d)
-{
-	int line = irq_to_gpio(d->irq);
-	int port = line >> 3;
-
-	gpio_int_unmasked[port] &= ~(1 << (line & 7));
-	ep93xx_gpio_update_int_params(port);
-}
-
-static void ep93xx_gpio_irq_unmask(struct irq_data *d)
-{
-	int line = irq_to_gpio(d->irq);
-	int port = line >> 3;
-
-	gpio_int_unmasked[port] |= 1 << (line & 7);
-	ep93xx_gpio_update_int_params(port);
-}
-
-/*
- * gpio_int_type1 controls whether the interrupt is level (0) or
- * edge (1) triggered, while gpio_int_type2 controls whether it
- * triggers on low/falling (0) or high/rising (1).
- */
-static int ep93xx_gpio_irq_type(struct irq_data *d, unsigned int type)
-{
-	const int gpio = irq_to_gpio(d->irq);
-	const int port = gpio >> 3;
-	const int port_mask = 1 << (gpio & 7);
-	irq_flow_handler_t handler;
-
-	gpio_direction_input(gpio);
-
-	switch (type) {
-	case IRQ_TYPE_EDGE_RISING:
-		gpio_int_type1[port] |= port_mask;
-		gpio_int_type2[port] |= port_mask;
-		handler = handle_edge_irq;
-		break;
-	case IRQ_TYPE_EDGE_FALLING:
-		gpio_int_type1[port] |= port_mask;
-		gpio_int_type2[port] &= ~port_mask;
-		handler = handle_edge_irq;
-		break;
-	case IRQ_TYPE_LEVEL_HIGH:
-		gpio_int_type1[port] &= ~port_mask;
-		gpio_int_type2[port] |= port_mask;
-		handler = handle_level_irq;
-		break;
-	case IRQ_TYPE_LEVEL_LOW:
-		gpio_int_type1[port] &= ~port_mask;
-		gpio_int_type2[port] &= ~port_mask;
-		handler = handle_level_irq;
-		break;
-	case IRQ_TYPE_EDGE_BOTH:
-		gpio_int_type1[port] |= port_mask;
-		/* set initial polarity based on current input level */
-		if (gpio_get_value(gpio))
-			gpio_int_type2[port] &= ~port_mask; /* falling */
-		else
-			gpio_int_type2[port] |= port_mask; /* rising */
-		handler = handle_edge_irq;
-		break;
-	default:
-		pr_err("failed to set irq type %d for gpio %d\n", type, gpio);
-		return -EINVAL;
-	}
-
-	__irq_set_handler_locked(d->irq, handler);
-
-	gpio_int_enabled[port] |= port_mask;
-
-	ep93xx_gpio_update_int_params(port);
-
-	return 0;
-}
-
-static struct irq_chip ep93xx_gpio_irq_chip = {
-	.name		= "GPIO",
-	.irq_ack	= ep93xx_gpio_irq_ack,
-	.irq_mask_ack	= ep93xx_gpio_irq_mask_ack,
-	.irq_mask	= ep93xx_gpio_irq_mask,
-	.irq_unmask	= ep93xx_gpio_irq_unmask,
-	.irq_set_type	= ep93xx_gpio_irq_type,
-};
-
-void __init ep93xx_gpio_init_irq(void)
-{
-	int gpio_irq;
-
-	for (gpio_irq = gpio_to_irq(0);
-	     gpio_irq <= gpio_to_irq(EP93XX_GPIO_LINE_MAX_IRQ); ++gpio_irq) {
-		irq_set_chip_and_handler(gpio_irq, &ep93xx_gpio_irq_chip,
-					 handle_level_irq);
-		set_irq_flags(gpio_irq, IRQF_VALID);
-	}
-
-	irq_set_chained_handler(IRQ_EP93XX_GPIO_AB,
-				ep93xx_gpio_ab_irq_handler);
-	irq_set_chained_handler(IRQ_EP93XX_GPIO0MUX,
-				ep93xx_gpio_f_irq_handler);
-	irq_set_chained_handler(IRQ_EP93XX_GPIO1MUX,
-				ep93xx_gpio_f_irq_handler);
-	irq_set_chained_handler(IRQ_EP93XX_GPIO2MUX,
-				ep93xx_gpio_f_irq_handler);
-	irq_set_chained_handler(IRQ_EP93XX_GPIO3MUX,
-				ep93xx_gpio_f_irq_handler);
-	irq_set_chained_handler(IRQ_EP93XX_GPIO4MUX,
-				ep93xx_gpio_f_irq_handler);
-	irq_set_chained_handler(IRQ_EP93XX_GPIO5MUX,
-				ep93xx_gpio_f_irq_handler);
-	irq_set_chained_handler(IRQ_EP93XX_GPIO6MUX,
-				ep93xx_gpio_f_irq_handler);
-	irq_set_chained_handler(IRQ_EP93XX_GPIO7MUX,
-				ep93xx_gpio_f_irq_handler);
-}
-
-
-/*************************************************************************
- * gpiolib interface for EP93xx on-chip GPIOs
- *************************************************************************/
-struct ep93xx_gpio_chip {
-	struct gpio_chip	chip;
-
-	void __iomem		*data_reg;
-	void __iomem		*data_dir_reg;
-};
-
-#define to_ep93xx_gpio_chip(c) container_of(c, struct ep93xx_gpio_chip, chip)
-
-static int ep93xx_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
-{
-	struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip);
-	unsigned long flags;
-	u8 v;
-
-	local_irq_save(flags);
-	v = __raw_readb(ep93xx_chip->data_dir_reg);
-	v &= ~(1 << offset);
-	__raw_writeb(v, ep93xx_chip->data_dir_reg);
-	local_irq_restore(flags);
-
-	return 0;
-}
-
-static int ep93xx_gpio_direction_output(struct gpio_chip *chip,
-					unsigned offset, int val)
-{
-	struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip);
-	unsigned long flags;
-	int line;
-	u8 v;
-
-	local_irq_save(flags);
-
-	/* Set the value */
-	v = __raw_readb(ep93xx_chip->data_reg);
-	if (val)
-		v |= (1 << offset);
-	else
-		v &= ~(1 << offset);
-	__raw_writeb(v, ep93xx_chip->data_reg);
-
-	/* Drive as an output */
-	line = chip->base + offset;
-	if (line <= EP93XX_GPIO_LINE_MAX_IRQ) {
-		/* Ports A/B/F */
-		ep93xx_gpio_int_mask(line);
-		ep93xx_gpio_update_int_params(line >> 3);
-	}
-
-	v = __raw_readb(ep93xx_chip->data_dir_reg);
-	v |= (1 << offset);
-	__raw_writeb(v, ep93xx_chip->data_dir_reg);
-
-	local_irq_restore(flags);
-
-	return 0;
-}
-
-static int ep93xx_gpio_get(struct gpio_chip *chip, unsigned offset)
-{
-	struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip);
-
-	return !!(__raw_readb(ep93xx_chip->data_reg) & (1 << offset));
-}
-
-static void ep93xx_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
-{
-	struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip);
-	unsigned long flags;
-	u8 v;
-
-	local_irq_save(flags);
-	v = __raw_readb(ep93xx_chip->data_reg);
-	if (val)
-		v |= (1 << offset);
-	else
-		v &= ~(1 << offset);
-	__raw_writeb(v, ep93xx_chip->data_reg);
-	local_irq_restore(flags);
-}
-
-static int ep93xx_gpio_set_debounce(struct gpio_chip *chip,
-				    unsigned offset, unsigned debounce)
-{
-	int gpio = chip->base + offset;
-	int irq = gpio_to_irq(gpio);
-
-	if (irq < 0)
-		return -EINVAL;
-
-	ep93xx_gpio_int_debounce(irq, debounce ? true : false);
-
-	return 0;
-}
-
-#define EP93XX_GPIO_BANK(name, dr, ddr, base_gpio)			\
-	{								\
-		.chip = {						\
-			.label		  = name,			\
-			.direction_input  = ep93xx_gpio_direction_input, \
-			.direction_output = ep93xx_gpio_direction_output, \
-			.get		  = ep93xx_gpio_get,		\
-			.set		  = ep93xx_gpio_set,		\
-			.base		  = base_gpio,			\
-			.ngpio		  = 8,				\
-		},							\
-		.data_reg	= EP93XX_GPIO_REG(dr),			\
-		.data_dir_reg	= EP93XX_GPIO_REG(ddr),			\
-	}
-
-static struct ep93xx_gpio_chip ep93xx_gpio_banks[] = {
-	EP93XX_GPIO_BANK("A", 0x00, 0x10, 0),
-	EP93XX_GPIO_BANK("B", 0x04, 0x14, 8),
-	EP93XX_GPIO_BANK("C", 0x08, 0x18, 40),
-	EP93XX_GPIO_BANK("D", 0x0c, 0x1c, 24),
-	EP93XX_GPIO_BANK("E", 0x20, 0x24, 32),
-	EP93XX_GPIO_BANK("F", 0x30, 0x34, 16),
-	EP93XX_GPIO_BANK("G", 0x38, 0x3c, 48),
-	EP93XX_GPIO_BANK("H", 0x40, 0x44, 56),
-};
-
-void __init ep93xx_gpio_init(void)
-{
-	int i;
-
-	/* Set Ports C, D, E, G, and H for GPIO use */
-	ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_KEYS |
-				 EP93XX_SYSCON_DEVCFG_GONK |
-				 EP93XX_SYSCON_DEVCFG_EONIDE |
-				 EP93XX_SYSCON_DEVCFG_GONIDE |
-				 EP93XX_SYSCON_DEVCFG_HONIDE);
-
-	for (i = 0; i < ARRAY_SIZE(ep93xx_gpio_banks); i++) {
-		struct gpio_chip *chip = &ep93xx_gpio_banks[i].chip;
-
-		/*
-		 * Ports A, B, and F support input debouncing when
-		 * used as interrupts.
-		 */
-		if (!strcmp(chip->label, "A") ||
-		    !strcmp(chip->label, "B") ||
-		    !strcmp(chip->label, "F"))
-			chip->set_debounce = ep93xx_gpio_set_debounce;
-
-		gpiochip_add(chip);
-	}
-}