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ARM: S5P: Add function to register gpio interrupt bank data

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This patch removes all global data from common s5p gpio interrupt
handler code. This enables to reuse this code on EXYNOS4 platform.
Instead of global data (IRQ_GPIOINT interrupt number,
S5P_GPIOINT_GROUP_MAXNR groups count), a s5p_register_gpioint_bank()
function is introduced. It is aimed to be called from gpiolib init.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
This commit is contained in:
Marek Szyprowski 2011-03-15 21:17:43 +09:00 committed by Kukjin Kim
parent 2de0926204
commit a43efddc3b
4 changed files with 76 additions and 10 deletions
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1
arch/arm/mach-s5pc100/gpiolib.c
View file

@ -348,6 +348,7 @@ static __init int s5pc100_gpiolib_init(void)
}
samsung_gpiolib_add_4bit_chips(s5pc100_gpio_chips, nr_chips);
s5p_register_gpioint_bank(IRQ_GPIOINT, 0, S5P_GPIOINT_GROUP_MAXNR);
return 0;
}

1
arch/arm/mach-s5pv210/gpiolib.c
View file

@ -281,6 +281,7 @@ static __init int s5pv210_gpiolib_init(void)
}
samsung_gpiolib_add_4bit_chips(s5pv210_gpio_4bit, nr_chips);
s5p_register_gpioint_bank(IRQ_GPIOINT, 0, S5P_GPIOINT_GROUP_MAXNR);
return 0;
}

68
arch/arm/plat-s5p/irq-gpioint.c
View file

@ -17,6 +17,7 @@
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <mach/map.h>
#include <plat/gpio-core.h>
@ -29,7 +30,16 @@
#define PEND_OFFSET 0xA00
#define REG_OFFSET(x) ((x) << 2)
static struct s3c_gpio_chip *irq_chips[S5P_GPIOINT_GROUP_MAXNR];
struct s5p_gpioint_bank {
struct list_head list;
int start;
int nr_groups;
int irq;
struct s3c_gpio_chip **chips;
void (*handler)(unsigned int, struct irq_desc *);
};
LIST_HEAD(banks);
static int s5p_gpioint_get_offset(struct irq_data *data)
{
@ -139,11 +149,12 @@ static struct irq_chip s5p_gpioint = {
static void s5p_gpioint_handler(unsigned int irq, struct irq_desc *desc)
{
struct s5p_gpioint_bank *bank = get_irq_data(irq);
int group, pend_offset, mask_offset;
unsigned int pend, mask;
for (group = 0; group < S5P_GPIOINT_GROUP_MAXNR; group++) {
struct s3c_gpio_chip *chip = irq_chips[group];
for (group = 0; group < bank->nr_groups; group++) {
struct s3c_gpio_chip *chip = bank->chips[group];
if (!chip)
continue;
@ -168,23 +179,44 @@ static void s5p_gpioint_handler(unsigned int irq, struct irq_desc *desc)
static __init int s5p_gpioint_add(struct s3c_gpio_chip *chip)
{
static int used_gpioint_groups = 0;
static bool handler_registered = 0;
int irq, group = chip->group;
int i;
struct s5p_gpioint_bank *bank = NULL;
if (used_gpioint_groups >= S5P_GPIOINT_GROUP_COUNT)
return -ENOMEM;
list_for_each_entry(bank, &banks, list) {
if (group >= bank->start &&
group < bank->start + bank->nr_groups)
break;
}
if (!bank)
return -EINVAL;
if (!bank->handler) {
bank->chips = kzalloc(sizeof(struct s3c_gpio_chip *) *
bank->nr_groups, GFP_KERNEL);
if (!bank->chips)
return -ENOMEM;
set_irq_chained_handler(bank->irq, s5p_gpioint_handler);
set_irq_data(bank->irq, bank);
bank->handler = s5p_gpioint_handler;
printk(KERN_INFO "Registered chained gpio int handler for interrupt %d.\n",
bank->irq);
}
/*
* chained GPIO irq has been sucessfully registered, allocate new gpio
* int group and assign irq nubmers
*/
chip->irq_base = S5P_GPIOINT_BASE +
used_gpioint_groups * S5P_GPIOINT_GROUP_SIZE;
used_gpioint_groups++;
if (!handler_registered) {
set_irq_chained_handler(IRQ_GPIOINT, s5p_gpioint_handler);
handler_registered = 1;
}
irq_chips[group] = chip;
bank->chips[group - bank->start] = chip;
for (i = 0; i < chip->chip.ngpio; i++) {
irq = chip->irq_base + i;
set_irq_chip(irq, &s5p_gpioint);
@ -221,3 +253,19 @@ int __init s5p_register_gpio_interrupt(int pin)
}
return ret;
}
int __init s5p_register_gpioint_bank(int chain_irq, int start, int nr_groups)
{
struct s5p_gpioint_bank *bank;
bank = kzalloc(sizeof(*bank), GFP_KERNEL);
if (!bank)
return -ENOMEM;
bank->start = start;
bank->nr_groups = nr_groups;
bank->irq = chain_irq;
list_add_tail(&bank->list, &banks);
return 0;
}

16
arch/arm/plat-samsung/include/plat/gpio-cfg.h
View file

@ -225,4 +225,20 @@ extern int s5p_gpio_set_drvstr(unsigned int pin, s5p_gpio_drvstr_t drvstr);
*/
extern int s5p_register_gpio_interrupt(int pin);
/** s5p_register_gpioint_bank() - add gpio bank for further gpio interrupt
* registration (see s5p_register_gpio_interrupt function)
* @chain_irq: chained irq number for the gpio int handler for this bank
* @start: start gpio group number of this bank
* @nr_groups: number of gpio groups handled by this bank
*
* This functions registers initial information about gpio banks that
* can be later used by the s5p_register_gpio_interrupt() function to
* enable support for gpio interrupt for particular gpio group.
*/
#ifdef CONFIG_S5P_GPIO_INT
extern int s5p_register_gpioint_bank(int chain_irq, int start, int nr_groups);
#else
#define s5p_register_gpioint_bank(chain_irq, start, nr_groups) do { } while (0)
#endif
#endif /* __PLAT_GPIO_CFG_H */