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Davinci: gpio - register layout invariant inlines 

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@ti.com>
Tested-by: Sandeep Paulraj <s-paulraj@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Cyril Chemparathy 2010-05-01 18:37:53 -04:00 committed by Kevin Hilman
parent 99e9e52de6
commit c12f415a91
3 changed files with 64 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
arch/arm/mach-davinci/gpio.c
View File

@ -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 = &regs->set_data;
chips[i].clr_data = &regs->clr_data;
chips[i].in_data = &regs->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;
}

4
arch/arm/mach-davinci/include/mach/common.h
View File

@ -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;

63
arch/arm/mach-davinci/include/mach/gpio.h
View File

@ -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;
struct davinci_gpio_controller *ctlrs = davinci_soc_info.gpio_ctlrs;
int index = gpio / 32;
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;
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);