[ARM] pxa: move common GPIO handling code into plat-pxa
1. add common GPIO handling code into [arch/arm/plat-pxa]
2. common code in <mach/gpio.h> moved into <plat/gpio.h>, new processors
should implement its own <mach/gpio.h>, provide the following required
definitions and '#include <plat/gpio.h>' in the end:
- GPIO_REGS_VIRT for mapped virtual address of the GPIO registers'
physical I/O memory
- macros of GPLR(), GPSR(), GPDR() for constant optimization for
functions gpio_{set,get}_value() (so that bit-bang code can still
have tolerable performance)
- NR_BUILTIN_GPIO for the number of onchip GPIO
- definitions of __gpio_is_inverted() and __gpio_is_occupied(), they
can be either macros or inlined functions
Signed-off-by: Eric Miao <eric.miao@marvell.com>
diff --git a/arch/arm/mach-pxa/Makefile b/arch/arm/mach-pxa/Makefile
index 70b4657..c80e1ba 100644
--- a/arch/arm/mach-pxa/Makefile
+++ b/arch/arm/mach-pxa/Makefile
@@ -4,7 +4,7 @@
# Common support (must be linked before board specific support)
obj-y += clock.o devices.o generic.o irq.o \
- time.o gpio.o reset.o
+ time.o reset.o
obj-$(CONFIG_PM) += pm.o sleep.o standby.o
ifeq ($(CONFIG_CPU_FREQ),y)
diff --git a/arch/arm/mach-pxa/gpio.c b/arch/arm/mach-pxa/gpio.c
deleted file mode 100644
index 7c22670..0000000
--- a/arch/arm/mach-pxa/gpio.c
+++ /dev/null
@@ -1,365 +0,0 @@
-/*
- * linux/arch/arm/mach-pxa/gpio.c
- *
- * Generic PXA GPIO handling
- *
- * Author: Nicolas Pitre
- * Created: Jun 15, 2001
- * Copyright: MontaVista Software Inc.
- *
- * 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.
- */
-
-#include <linux/init.h>
-#include <linux/irq.h>
-#include <linux/io.h>
-#include <linux/sysdev.h>
-#include <linux/bootmem.h>
-
-#include <mach/gpio.h>
-
-int pxa_last_gpio;
-
-/*
- * We handle the GPIOs by banks, each bank covers up to 32 GPIOs with
- * one set of registers. The register offsets are organized below:
- *
- * GPLR GPDR GPSR GPCR GRER GFER GEDR
- * BANK 0 - 0x0000 0x000C 0x0018 0x0024 0x0030 0x003C 0x0048
- * BANK 1 - 0x0004 0x0010 0x001C 0x0028 0x0034 0x0040 0x004C
- * BANK 2 - 0x0008 0x0014 0x0020 0x002C 0x0038 0x0044 0x0050
- *
- * BANK 3 - 0x0100 0x010C 0x0118 0x0124 0x0130 0x013C 0x0148
- * BANK 4 - 0x0104 0x0110 0x011C 0x0128 0x0134 0x0140 0x014C
- * BANK 5 - 0x0108 0x0114 0x0120 0x012C 0x0138 0x0144 0x0150
- *
- * NOTE:
- * BANK 3 is only available on PXA27x and later processors.
- * BANK 4 and 5 are only available on PXA935
- */
-
-#define GPIO_BANK(n) (GPIO_REGS_VIRT + BANK_OFF(n))
-
-#define GPLR_OFFSET 0x00
-#define GPDR_OFFSET 0x0C
-#define GPSR_OFFSET 0x18
-#define GPCR_OFFSET 0x24
-#define GRER_OFFSET 0x30
-#define GFER_OFFSET 0x3C
-#define GEDR_OFFSET 0x48
-
-struct pxa_gpio_chip {
- struct gpio_chip chip;
- void __iomem *regbase;
- char label[10];
-
- unsigned long irq_mask;
- unsigned long irq_edge_rise;
- unsigned long irq_edge_fall;
-
-#ifdef CONFIG_PM
- unsigned long saved_gplr;
- unsigned long saved_gpdr;
- unsigned long saved_grer;
- unsigned long saved_gfer;
-#endif
-};
-
-static DEFINE_SPINLOCK(gpio_lock);
-static struct pxa_gpio_chip *pxa_gpio_chips;
-
-#define for_each_gpio_chip(i, c) \
- for (i = 0, c = &pxa_gpio_chips[0]; i <= pxa_last_gpio; i += 32, c++)
-
-static inline void __iomem *gpio_chip_base(struct gpio_chip *c)
-{
- return container_of(c, struct pxa_gpio_chip, chip)->regbase;
-}
-
-static inline struct pxa_gpio_chip *gpio_to_chip(unsigned gpio)
-{
- return &pxa_gpio_chips[gpio_to_bank(gpio)];
-}
-
-static int pxa_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
-{
- void __iomem *base = gpio_chip_base(chip);
- uint32_t value, mask = 1 << offset;
- unsigned long flags;
-
- spin_lock_irqsave(&gpio_lock, flags);
-
- value = __raw_readl(base + GPDR_OFFSET);
- if (__gpio_is_inverted(chip->base + offset))
- value |= mask;
- else
- value &= ~mask;
- __raw_writel(value, base + GPDR_OFFSET);
-
- spin_unlock_irqrestore(&gpio_lock, flags);
- return 0;
-}
-
-static int pxa_gpio_direction_output(struct gpio_chip *chip,
- unsigned offset, int value)
-{
- void __iomem *base = gpio_chip_base(chip);
- uint32_t tmp, mask = 1 << offset;
- unsigned long flags;
-
- __raw_writel(mask, base + (value ? GPSR_OFFSET : GPCR_OFFSET));
-
- spin_lock_irqsave(&gpio_lock, flags);
-
- tmp = __raw_readl(base + GPDR_OFFSET);
- if (__gpio_is_inverted(chip->base + offset))
- tmp &= ~mask;
- else
- tmp |= mask;
- __raw_writel(tmp, base + GPDR_OFFSET);
-
- spin_unlock_irqrestore(&gpio_lock, flags);
- return 0;
-}
-
-static int pxa_gpio_get(struct gpio_chip *chip, unsigned offset)
-{
- return __raw_readl(gpio_chip_base(chip) + GPLR_OFFSET) & (1 << offset);
-}
-
-static void pxa_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
-{
- __raw_writel(1 << offset, gpio_chip_base(chip) +
- (value ? GPSR_OFFSET : GPCR_OFFSET));
-}
-
-static int __init pxa_init_gpio_chip(int gpio_end)
-{
- int i, gpio, nbanks = gpio_to_bank(gpio_end) + 1;
- struct pxa_gpio_chip *chips;
-
- /* this is early, we have to use bootmem allocator, and we really
- * want this to be allocated dynamically for different 'gpio_end'
- */
- chips = alloc_bootmem_low(nbanks * sizeof(struct pxa_gpio_chip));
- if (chips == NULL) {
- pr_err("%s: failed to allocate GPIO chips\n", __func__);
- return -ENOMEM;
- }
-
- for (i = 0, gpio = 0; i < nbanks; i++, gpio += 32) {
- struct gpio_chip *c = &chips[i].chip;
-
- sprintf(chips[i].label, "gpio-%d", i);
- chips[i].regbase = (void __iomem *)GPIO_BANK(i);
-
- c->base = gpio;
- c->label = chips[i].label;
-
- c->direction_input = pxa_gpio_direction_input;
- c->direction_output = pxa_gpio_direction_output;
- c->get = pxa_gpio_get;
- c->set = pxa_gpio_set;
-
- /* number of GPIOs on last bank may be less than 32 */
- c->ngpio = (gpio + 31 > gpio_end) ? (gpio_end - gpio + 1) : 32;
- gpiochip_add(c);
- }
- pxa_gpio_chips = chips;
- return 0;
-}
-
-static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
-{
- struct pxa_gpio_chip *c;
- int gpio = irq_to_gpio(irq);
- unsigned long gpdr, mask = GPIO_bit(gpio);
-
- c = gpio_to_chip(gpio);
-
- if (type == IRQ_TYPE_PROBE) {
- /* Don't mess with enabled GPIOs using preconfigured edges or
- * GPIOs set to alternate function or to output during probe
- */
- if ((c->irq_edge_rise | c->irq_edge_fall) & GPIO_bit(gpio))
- return 0;
-
- if (__gpio_is_occupied(gpio))
- return 0;
-
- type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
- }
-
- gpdr = __raw_readl(c->regbase + GPDR_OFFSET);
-
- if (__gpio_is_inverted(gpio))
- __raw_writel(gpdr | mask, c->regbase + GPDR_OFFSET);
- else
- __raw_writel(gpdr & ~mask, c->regbase + GPDR_OFFSET);
-
- if (type & IRQ_TYPE_EDGE_RISING)
- c->irq_edge_rise |= mask;
- else
- c->irq_edge_rise &= ~mask;
-
- if (type & IRQ_TYPE_EDGE_FALLING)
- c->irq_edge_fall |= mask;
- else
- c->irq_edge_fall &= ~mask;
-
- __raw_writel(c->irq_edge_rise & c->irq_mask, c->regbase + GRER_OFFSET);
- __raw_writel(c->irq_edge_fall & c->irq_mask, c->regbase + GFER_OFFSET);
-
- pr_debug("%s: IRQ%d (GPIO%d) - edge%s%s\n", __func__, irq, gpio,
- ((type & IRQ_TYPE_EDGE_RISING) ? " rising" : ""),
- ((type & IRQ_TYPE_EDGE_FALLING) ? " falling" : ""));
- return 0;
-}
-
-static void pxa_gpio_demux_handler(unsigned int irq, struct irq_desc *desc)
-{
- struct pxa_gpio_chip *c;
- int loop, gpio, gpio_base, n;
- unsigned long gedr;
-
- do {
- loop = 0;
- for_each_gpio_chip(gpio, c) {
- gpio_base = c->chip.base;
-
- gedr = __raw_readl(c->regbase + GEDR_OFFSET);
- gedr = gedr & c->irq_mask;
- __raw_writel(gedr, c->regbase + GEDR_OFFSET);
-
- n = find_first_bit(&gedr, BITS_PER_LONG);
- while (n < BITS_PER_LONG) {
- loop = 1;
-
- generic_handle_irq(gpio_to_irq(gpio_base + n));
- n = find_next_bit(&gedr, BITS_PER_LONG, n + 1);
- }
- }
- } while (loop);
-}
-
-static void pxa_ack_muxed_gpio(unsigned int irq)
-{
- int gpio = irq_to_gpio(irq);
- struct pxa_gpio_chip *c = gpio_to_chip(gpio);
-
- __raw_writel(GPIO_bit(gpio), c->regbase + GEDR_OFFSET);
-}
-
-static void pxa_mask_muxed_gpio(unsigned int irq)
-{
- int gpio = irq_to_gpio(irq);
- struct pxa_gpio_chip *c = gpio_to_chip(gpio);
- uint32_t grer, gfer;
-
- c->irq_mask &= ~GPIO_bit(gpio);
-
- grer = __raw_readl(c->regbase + GRER_OFFSET) & ~GPIO_bit(gpio);
- gfer = __raw_readl(c->regbase + GFER_OFFSET) & ~GPIO_bit(gpio);
- __raw_writel(grer, c->regbase + GRER_OFFSET);
- __raw_writel(gfer, c->regbase + GFER_OFFSET);
-}
-
-static void pxa_unmask_muxed_gpio(unsigned int irq)
-{
- int gpio = irq_to_gpio(irq);
- struct pxa_gpio_chip *c = gpio_to_chip(gpio);
-
- c->irq_mask |= GPIO_bit(gpio);
- __raw_writel(c->irq_edge_rise & c->irq_mask, c->regbase + GRER_OFFSET);
- __raw_writel(c->irq_edge_fall & c->irq_mask, c->regbase + GFER_OFFSET);
-}
-
-static struct irq_chip pxa_muxed_gpio_chip = {
- .name = "GPIO",
- .ack = pxa_ack_muxed_gpio,
- .mask = pxa_mask_muxed_gpio,
- .unmask = pxa_unmask_muxed_gpio,
- .set_type = pxa_gpio_irq_type,
-};
-
-void __init pxa_init_gpio(int mux_irq, int start, int end, set_wake_t fn)
-{
- struct pxa_gpio_chip *c;
- int gpio, irq;
-
- pxa_last_gpio = end;
-
- /* Initialize GPIO chips */
- pxa_init_gpio_chip(end);
-
- /* clear all GPIO edge detects */
- for_each_gpio_chip(gpio, c) {
- __raw_writel(0, c->regbase + GFER_OFFSET);
- __raw_writel(0, c->regbase + GRER_OFFSET);
- __raw_writel(~0,c->regbase + GEDR_OFFSET);
- }
-
- for (irq = gpio_to_irq(start); irq <= gpio_to_irq(end); irq++) {
- set_irq_chip(irq, &pxa_muxed_gpio_chip);
- set_irq_handler(irq, handle_edge_irq);
- set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
- }
-
- /* Install handler for GPIO>=2 edge detect interrupts */
- set_irq_chained_handler(mux_irq, pxa_gpio_demux_handler);
- pxa_muxed_gpio_chip.set_wake = fn;
-}
-
-#ifdef CONFIG_PM
-static int pxa_gpio_suspend(struct sys_device *dev, pm_message_t state)
-{
- struct pxa_gpio_chip *c;
- int gpio;
-
- for_each_gpio_chip(gpio, c) {
- c->saved_gplr = __raw_readl(c->regbase + GPLR_OFFSET);
- c->saved_gpdr = __raw_readl(c->regbase + GPDR_OFFSET);
- c->saved_grer = __raw_readl(c->regbase + GRER_OFFSET);
- c->saved_gfer = __raw_readl(c->regbase + GFER_OFFSET);
-
- /* Clear GPIO transition detect bits */
- __raw_writel(0xffffffff, c->regbase + GEDR_OFFSET);
- }
- return 0;
-}
-
-static int pxa_gpio_resume(struct sys_device *dev)
-{
- struct pxa_gpio_chip *c;
- int gpio;
-
- for_each_gpio_chip(gpio, c) {
- /* restore level with set/clear */
- __raw_writel( c->saved_gplr, c->regbase + GPSR_OFFSET);
- __raw_writel(~c->saved_gplr, c->regbase + GPCR_OFFSET);
-
- __raw_writel(c->saved_grer, c->regbase + GRER_OFFSET);
- __raw_writel(c->saved_gfer, c->regbase + GFER_OFFSET);
- __raw_writel(c->saved_gpdr, c->regbase + GPDR_OFFSET);
- }
- return 0;
-}
-#else
-#define pxa_gpio_suspend NULL
-#define pxa_gpio_resume NULL
-#endif
-
-struct sysdev_class pxa_gpio_sysclass = {
- .name = "gpio",
- .suspend = pxa_gpio_suspend,
- .resume = pxa_gpio_resume,
-};
-
-static int __init pxa_gpio_init(void)
-{
- return sysdev_class_register(&pxa_gpio_sysclass);
-}
-
-core_initcall(pxa_gpio_init);
diff --git a/arch/arm/mach-pxa/include/mach/gpio.h b/arch/arm/mach-pxa/include/mach/gpio.h
index c72c89a..b024a8b 100644
--- a/arch/arm/mach-pxa/include/mach/gpio.h
+++ b/arch/arm/mach-pxa/include/mach/gpio.h
@@ -99,40 +99,12 @@
#define GAFR(x) GPIO_REG(0x54 + (((x) & 0x70) >> 2))
-/* NOTE: some PXAs have fewer on-chip GPIOs (like PXA255, with 85).
- * Those cases currently cause holes in the GPIO number space, the
- * actual number of the last GPIO is recorded by 'pxa_last_gpio'.
- */
-extern int pxa_last_gpio;
-
#define NR_BUILTIN_GPIO 128
-static inline int gpio_get_value(unsigned gpio)
-{
- if (__builtin_constant_p(gpio) && (gpio < NR_BUILTIN_GPIO))
- return GPLR(gpio) & GPIO_bit(gpio);
- else
- return __gpio_get_value(gpio);
-}
-
-static inline void gpio_set_value(unsigned gpio, int value)
-{
- if (__builtin_constant_p(gpio) && (gpio < NR_BUILTIN_GPIO)) {
- if (value)
- GPSR(gpio) = GPIO_bit(gpio);
- else
- GPCR(gpio) = GPIO_bit(gpio);
- } else {
- __gpio_set_value(gpio, value);
- }
-}
-
-#define gpio_cansleep __gpio_cansleep
#define gpio_to_bank(gpio) ((gpio) >> 5)
#define gpio_to_irq(gpio) IRQ_GPIO(gpio)
#define irq_to_gpio(irq) IRQ_TO_GPIO(irq)
-
#ifdef CONFIG_CPU_PXA26x
/* GPIO86/87/88/89 on PXA26x have their direction bits in GPDR2 inverted,
* as well as their Alternate Function value being '1' for GPIO in GAFRx.
@@ -165,7 +137,5 @@
return GPDR(gpio) & GPIO_bit(gpio);
}
-typedef int (*set_wake_t)(unsigned int irq, unsigned int on);
-
-extern void pxa_init_gpio(int mux_irq, int start, int end, set_wake_t fn);
+#include <plat/gpio.h>
#endif