Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

[ARM] 4739/1: at91sam9263: make gpio bank C and D irqs work

Browse source 
On the at91sam9263, IRQs for GPIO banks C and D don't currently work.
This is because banks C, D, and E share one clock and toplevel IRQ, but
the AT91 code setting up and handling GPIO IRQs expects no sharing.
This patch:

 - Fixes GPIO IRQ setup and handling to cope with GPIO banks that are
   shared like on sam9263 chips, by setting up a list of those banks
   and making the IRQ dispatching logic scan that list.

 - Precomputes the address of each bank's registers, saving it with
   other per-bank data so that it no longer needs to be constantly
   recomputed during IRQs and other GPIO operations.  That shrinks
   hot-path code, while helping the GPIO bank irq updates.

 - Fixes a minor bug where IRQ_TYPE_NONE was wrongly rejected (it just
   means "use the default", which is "both edges" here).

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
David Brownell 2008-01-04 18:30:24 +01:00 committed by Russell King
parent ae9458d6a0
commit e83aff58bf
2 changed files with 63 additions and 29 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
arch/arm/mach-at91/generic.h
View file

@ -47,6 +47,9 @@ extern void at91_irq_resume(void);
#define AT91RM9200_BGA 4 /* AT91RM9200 BGA package has 4 banks */
struct at91_gpio_bank {
unsigned chipbase; /* bank's first GPIO number */
void __iomem *regbase; /* base of register bank */
struct at91_gpio_bank *next; /* bank sharing same IRQ/clock/... */
unsigned short id; /* peripheral ID */
unsigned long offset; /* offset from system peripheral base */
struct clk *clock; /* associated clock */

89
arch/arm/mach-at91/gpio.c
View file

@ -33,12 +33,10 @@ static int gpio_banks;
static inline void __iomem *pin_to_controller(unsigned pin)
{
void __iomem *sys_base = (void __iomem *) AT91_VA_BASE_SYS;
pin -= PIN_BASE;
pin /= 32;
if (likely(pin < gpio_banks))
return sys_base + gpio[pin].offset;
return gpio[pin].regbase;
return NULL;
}
@ -294,11 +292,11 @@ void at91_gpio_suspend(void)
int i;
for (i = 0; i < gpio_banks; i++) {
u32 pio = gpio[i].offset;
void __iomem *pio = gpio[i].regbase;
backups[i] = at91_sys_read(pio + PIO_IMR);
at91_sys_write(pio + PIO_IDR, backups[i]);
at91_sys_write(pio + PIO_IER, wakeups[i]);
backups[i] = __raw_readl(pio + PIO_IMR);
__raw_writel(backups[i], pio + PIO_IDR);
__raw_writel(wakeups[i], pio + PIO_IER);
if (!wakeups[i])
clk_disable(gpio[i].clock);
@ -315,13 +313,13 @@ void at91_gpio_resume(void)
int i;
for (i = 0; i < gpio_banks; i++) {
u32 pio = gpio[i].offset;
void __iomem *pio = gpio[i].regbase;
if (!wakeups[i])
clk_enable(gpio[i].clock);
at91_sys_write(pio + PIO_IDR, wakeups[i]);
at91_sys_write(pio + PIO_IER, backups[i]);
__raw_writel(wakeups[i], pio + PIO_IDR);
__raw_writel(backups[i], pio + PIO_IER);
}
}
@ -361,7 +359,13 @@ static void gpio_irq_unmask(unsigned pin)
static int gpio_irq_type(unsigned pin, unsigned type)
{
return (type == IRQT_BOTHEDGE) ? 0 : -EINVAL;
switch (type) {
case IRQ_TYPE_NONE:
case IRQ_TYPE_EDGE_BOTH:
return 0;
default:
return -EINVAL;
}
}
static struct irq_chip gpio_irqchip = {
@ -376,20 +380,30 @@ static void gpio_irq_handler(unsigned irq, struct irq_desc *desc)
{
unsigned pin;
struct irq_desc *gpio;
struct at91_gpio_bank *bank;
void __iomem *pio;
u32 isr;
pio = get_irq_chip_data(irq);
bank = get_irq_chip_data(irq);
pio = bank->regbase;
/* temporarily mask (level sensitive) parent IRQ */
desc->chip->ack(irq);
for (;;) {
/* reading ISR acks the pending (edge triggered) GPIO interrupt */
/* Reading ISR acks pending (edge triggered) GPIO interrupts.
* When there none are pending, we're finished unless we need
* to process multiple banks (like ID_PIOCDE on sam9263).
*/
isr = __raw_readl(pio + PIO_ISR) & __raw_readl(pio + PIO_IMR);
if (!isr)
break;
if (!isr) {
if (!bank->next)
break;
bank = bank->next;
pio = bank->regbase;
continue;
}
pin = (unsigned) get_irq_data(irq);
pin = bank->chipbase;
gpio = &irq_desc[pin];
while (isr) {
@ -481,24 +495,21 @@ postcore_initcall(at91_gpio_debugfs_init);
*/
void __init at91_gpio_irq_setup(void)
{
unsigned pioc, pin;
unsigned pioc, pin;
struct at91_gpio_bank *this, *prev;
for (pioc = 0, pin = PIN_BASE;
pioc < gpio_banks;
pioc++) {
void __iomem *controller;
unsigned id = gpio[pioc].id;
for (pioc = 0, pin = PIN_BASE, this = gpio, prev = NULL;
pioc++ < gpio_banks;
prev = this, this++) {
unsigned id = this->id;
unsigned i;
clk_enable(gpio[pioc].clock); /* enable PIO controller's clock */
/* enable PIO controller's clock */
clk_enable(this->clock);
controller = (void __iomem *) AT91_VA_BASE_SYS + gpio[pioc].offset;
__raw_writel(~0, controller + PIO_IDR);
__raw_writel(~0, this->regbase + PIO_IDR);
set_irq_data(id, (void *) pin);
set_irq_chip_data(id, controller);
for (i = 0; i < 32; i++, pin++) {
for (i = 0, pin = this->chipbase; i < 32; i++, pin++) {
/*
* Can use the "simple" and not "edge" handler since it's
* shorter, and the AIC handles interrupts sanely.
@ -508,6 +519,14 @@ void __init at91_gpio_irq_setup(void)
set_irq_flags(pin, IRQF_VALID);
}
/* The toplevel handler handles one bank of GPIOs, except
* AT91SAM9263_ID_PIOCDE handles three... PIOC is first in
* the list, so we only set up that handler.
*/
if (prev && prev->next == this)
continue;
set_irq_chip_data(id, this);
set_irq_chained_handler(id, gpio_irq_handler);
}
pr_info("AT91: %d gpio irqs in %d banks\n", pin - PIN_BASE, gpio_banks);
@ -518,8 +537,20 @@ void __init at91_gpio_irq_setup(void)
*/
void __init at91_gpio_init(struct at91_gpio_bank *data, int nr_banks)
{
unsigned i;
struct at91_gpio_bank *last;
BUG_ON(nr_banks > MAX_GPIO_BANKS);
gpio = data;
gpio_banks = nr_banks;
for (i = 0, last = NULL; i < nr_banks; i++, last = data, data++) {
data->chipbase = PIN_BASE + i * 32;
data->regbase = data->offset + (void __iomem *)AT91_VA_BASE_SYS;
/* AT91SAM9263_ID_PIOCDE groups PIOC, PIOD, PIOE */
if (last && last->id == data->id)
last->next = data;
}
}