[PATCH 25/34] Davinci: gpio - register layout invariant inlines
Kevin Hilman
khilman at deeprootsystems.com
Thu May 6 19:24:16 EDT 2010
From: Cyril Chemparathy <cyril at ti.com>
This patch renders the inlined gpio accessors in gpio.h independent of the
underlying controller's register layout. This is done by including three new
fields in davinci_gpio_controller to hold the addresses of the set, clear, and
in data registers.
Other changes:
1. davinci_gpio_regs structure definition moved to gpio.c. This structure is
no longer common across all davinci socs (davinci_gpio_controller is).
2. controller base address calculation code (gpio2controller()) moved to
gpio.c as this was no longer necessary for the inline implementation.
3. modified inline range checks to use davinci_soc_info.gpio_num instead of
DAVINCI_N_GPIO.
Signed-off-by: Cyril Chemparathy <cyril at ti.com>
Tested-by: Sandeep Paulraj <s-paulraj at ti.com>
Signed-off-by: Kevin Hilman <khilman at deeprootsystems.com>
---
arch/arm/mach-davinci/gpio.c | 41 ++++++++++++++++-
arch/arm/mach-davinci/include/mach/common.h | 4 ++
arch/arm/mach-davinci/include/mach/gpio.h | 65 +++++++++-----------------
3 files changed, 65 insertions(+), 45 deletions(-)
diff --git a/arch/arm/mach-davinci/gpio.c b/arch/arm/mach-davinci/gpio.c
index c77683c..d241b4f 100644
--- a/arch/arm/mach-davinci/gpio.c
+++ b/arch/arm/mach-davinci/gpio.c
@@ -20,6 +20,19 @@
#include <asm/mach/irq.h>
+struct davinci_gpio_regs {
+ u32 dir;
+ u32 out_data;
+ u32 set_data;
+ u32 clr_data;
+ u32 in_data;
+ u32 set_rising;
+ u32 clr_rising;
+ u32 set_falling;
+ u32 clr_falling;
+ u32 intstat;
+};
+
static DEFINE_SPINLOCK(gpio_lock);
#define chip2controller(chip) \
@@ -27,10 +40,24 @@ static DEFINE_SPINLOCK(gpio_lock);
static struct davinci_gpio_controller chips[DIV_ROUND_UP(DAVINCI_N_GPIO, 32)];
-/* create a non-inlined version */
static struct davinci_gpio_regs __iomem __init *gpio2regs(unsigned gpio)
{
- return __gpio_to_controller(gpio);
+ void __iomem *ptr;
+ void __iomem *base = davinci_soc_info.gpio_base;
+
+ if (gpio < 32 * 1)
+ ptr = base + 0x10;
+ else if (gpio < 32 * 2)
+ ptr = base + 0x38;
+ else if (gpio < 32 * 3)
+ ptr = base + 0x60;
+ else if (gpio < 32 * 4)
+ ptr = base + 0x88;
+ else if (gpio < 32 * 5)
+ ptr = base + 0xb0;
+ else
+ ptr = NULL;
+ return ptr;
}
static inline struct davinci_gpio_regs __iomem *irq2regs(int irq)
@@ -116,6 +143,7 @@ static int __init davinci_gpio_setup(void)
int i, base;
unsigned ngpio;
struct davinci_soc_info *soc_info = &davinci_soc_info;
+ struct davinci_gpio_regs *regs;
/*
* The gpio banks conceptually expose a segmented bitmap,
@@ -144,11 +172,18 @@ static int __init davinci_gpio_setup(void)
if (chips[i].chip.ngpio > 32)
chips[i].chip.ngpio = 32;
- chips[i].regs = gpio2regs(base);
+ regs = gpio2regs(base);
+ chips[i].regs = regs;
+ chips[i].set_data = ®s->set_data;
+ chips[i].clr_data = ®s->clr_data;
+ chips[i].in_data = ®s->in_data;
gpiochip_add(&chips[i].chip);
}
+ soc_info->gpio_ctlrs = chips;
+ soc_info->gpio_ctlrs_num = DIV_ROUND_UP(ngpio, 32);
+
davinci_gpio_irq_setup();
return 0;
}
diff --git a/arch/arm/mach-davinci/include/mach/common.h b/arch/arm/mach-davinci/include/mach/common.h
index 884dc72..1d72883 100644
--- a/arch/arm/mach-davinci/include/mach/common.h
+++ b/arch/arm/mach-davinci/include/mach/common.h
@@ -37,6 +37,8 @@ struct davinci_timer_info {
unsigned int clocksource_id;
};
+struct davinci_gpio_controller;
+
/* SoC specific init support */
struct davinci_soc_info {
struct map_desc *io_desc;
@@ -61,6 +63,8 @@ struct davinci_soc_info {
unsigned gpio_num;
unsigned gpio_irq;
unsigned gpio_unbanked;
+ struct davinci_gpio_controller *gpio_ctlrs;
+ int gpio_ctlrs_num;
struct platform_device *serial_dev;
struct emac_platform_data *emac_pdata;
dma_addr_t sram_dma;
diff --git a/arch/arm/mach-davinci/include/mach/gpio.h b/arch/arm/mach-davinci/include/mach/gpio.h
index bdab001..82591d0 100644
--- a/arch/arm/mach-davinci/include/mach/gpio.h
+++ b/arch/arm/mach-davinci/include/mach/gpio.h
@@ -45,23 +45,13 @@
/* Convert GPIO signal to GPIO pin number */
#define GPIO_TO_PIN(bank, gpio) (16 * (bank) + (gpio))
-struct davinci_gpio_regs {
- u32 dir;
- u32 out_data;
- u32 set_data;
- u32 clr_data;
- u32 in_data;
- u32 set_rising;
- u32 clr_rising;
- u32 set_falling;
- u32 clr_falling;
- u32 intstat;
-};
-
struct davinci_gpio_controller {
- struct davinci_gpio_regs __iomem *regs;
struct gpio_chip chip;
int irq_base;
+ void __iomem *regs;
+ void __iomem *set_data;
+ void __iomem *clr_data;
+ void __iomem *in_data;
};
/* The __gpio_to_controller() and __gpio_mask() functions inline to constants
@@ -73,25 +63,16 @@ struct davinci_gpio_controller {
*
* These are NOT part of the cross-platform GPIO interface
*/
-static inline struct davinci_gpio_regs __iomem *
+static inline struct davinci_gpio_controller *
__gpio_to_controller(unsigned gpio)
{
- void __iomem *ptr;
- void __iomem *base = davinci_soc_info.gpio_base;
-
- if (gpio < 32 * 1)
- ptr = base + 0x10;
- else if (gpio < 32 * 2)
- ptr = base + 0x38;
- else if (gpio < 32 * 3)
- ptr = base + 0x60;
- else if (gpio < 32 * 4)
- ptr = base + 0x88;
- else if (gpio < 32 * 5)
- ptr = base + 0xb0;
- else
- ptr = NULL;
- return ptr;
+ struct davinci_gpio_controller *ctlrs = davinci_soc_info.gpio_ctlrs;
+ int index = gpio / 32;
+
+ if (!ctlrs || index >= davinci_soc_info.gpio_ctlrs_num)
+ return NULL;
+
+ return ctlrs + index;
}
static inline u32 __gpio_mask(unsigned gpio)
@@ -107,16 +88,16 @@ static inline u32 __gpio_mask(unsigned gpio)
*/
static inline void gpio_set_value(unsigned gpio, int value)
{
- if (__builtin_constant_p(value) && gpio < DAVINCI_N_GPIO) {
- struct davinci_gpio_regs __iomem *g;
- u32 mask;
+ if (__builtin_constant_p(value) && gpio < davinci_soc_info.gpio_num) {
+ struct davinci_gpio_controller *ctlr;
+ u32 mask;
- g = __gpio_to_controller(gpio);
+ ctlr = __gpio_to_controller(gpio);
mask = __gpio_mask(gpio);
if (value)
- __raw_writel(mask, &g->set_data);
+ __raw_writel(mask, ctlr->set_data);
else
- __raw_writel(mask, &g->clr_data);
+ __raw_writel(mask, ctlr->clr_data);
return;
}
@@ -134,18 +115,18 @@ static inline void gpio_set_value(unsigned gpio, int value)
*/
static inline int gpio_get_value(unsigned gpio)
{
- struct davinci_gpio_regs __iomem *g;
+ struct davinci_gpio_controller *ctlr;
- if (!__builtin_constant_p(gpio) || gpio >= DAVINCI_N_GPIO)
+ if (!__builtin_constant_p(gpio) || gpio >= davinci_soc_info.gpio_num)
return __gpio_get_value(gpio);
- g = __gpio_to_controller(gpio);
- return __gpio_mask(gpio) & __raw_readl(&g->in_data);
+ ctlr = __gpio_to_controller(gpio);
+ return __gpio_mask(gpio) & __raw_readl(ctlr->in_data);
}
static inline int gpio_cansleep(unsigned gpio)
{
- if (__builtin_constant_p(gpio) && gpio < DAVINCI_N_GPIO)
+ if (__builtin_constant_p(gpio) && gpio < davinci_soc_info.gpio_num)
return 0;
else
return __gpio_cansleep(gpio);
--
1.7.0.2
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