#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/module.h>
-#include <linux/list.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/amba/bus.h>
#include <linux/amba/pl061.h>
#include <linux/slab.h>
+#include <linux/pm.h>
+#include <asm/mach/irq.h>
#define GPIODIR 0x400
#define GPIOIS 0x404
#define PL061_GPIO_NR 8
-struct pl061_gpio {
- /* We use a list of pl061_gpio structs for each trigger IRQ in the main
- * interrupts controller of the system. We need this to support systems
- * in which more that one PL061s are connected to the same IRQ. The ISR
- * interates through this list to find the source of the interrupt.
- */
- struct list_head list;
+#ifdef CONFIG_PM
+struct pl061_context_save_regs {
+ u8 gpio_data;
+ u8 gpio_dir;
+ u8 gpio_is;
+ u8 gpio_ibe;
+ u8 gpio_iev;
+ u8 gpio_ie;
+};
+#endif
+struct pl061_gpio {
/* Each of the two spinlocks protects a different set of hardware
* regiters and data structurs. This decouples the code of the IRQ from
* the GPIO code. This also makes the case of a GPIO routine call from
* the IRQ code simpler.
*/
spinlock_t lock; /* GPIO registers */
- spinlock_t irq_lock; /* IRQ registers */
void __iomem *base;
- unsigned irq_base;
+ int irq_base;
+ struct irq_chip_generic *irq_gc;
struct gpio_chip gc;
+
+#ifdef CONFIG_PM
+ struct pl061_context_save_regs csave_regs;
+#endif
};
static int pl061_direction_input(struct gpio_chip *gc, unsigned offset)
{
struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
- if (chip->irq_base == NO_IRQ)
+ if (chip->irq_base <= 0)
return -EINVAL;
return chip->irq_base + offset;
}
-/*
- * PL061 GPIO IRQ
- */
-static void pl061_irq_disable(struct irq_data *d)
-{
- struct pl061_gpio *chip = irq_data_get_irq_chip_data(d);
- int offset = d->irq - chip->irq_base;
- unsigned long flags;
- u8 gpioie;
-
- spin_lock_irqsave(&chip->irq_lock, flags);
- gpioie = readb(chip->base + GPIOIE);
- gpioie &= ~(1 << offset);
- writeb(gpioie, chip->base + GPIOIE);
- spin_unlock_irqrestore(&chip->irq_lock, flags);
-}
-
-static void pl061_irq_enable(struct irq_data *d)
-{
- struct pl061_gpio *chip = irq_data_get_irq_chip_data(d);
- int offset = d->irq - chip->irq_base;
- unsigned long flags;
- u8 gpioie;
-
- spin_lock_irqsave(&chip->irq_lock, flags);
- gpioie = readb(chip->base + GPIOIE);
- gpioie |= 1 << offset;
- writeb(gpioie, chip->base + GPIOIE);
- spin_unlock_irqrestore(&chip->irq_lock, flags);
-}
-
static int pl061_irq_type(struct irq_data *d, unsigned trigger)
{
- struct pl061_gpio *chip = irq_data_get_irq_chip_data(d);
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct pl061_gpio *chip = gc->private;
int offset = d->irq - chip->irq_base;
unsigned long flags;
u8 gpiois, gpioibe, gpioiev;
if (offset < 0 || offset >= PL061_GPIO_NR)
return -EINVAL;
- spin_lock_irqsave(&chip->irq_lock, flags);
+ raw_spin_lock_irqsave(&gc->lock, flags);
gpioiev = readb(chip->base + GPIOIEV);
writeb(gpioiev, chip->base + GPIOIEV);
- spin_unlock_irqrestore(&chip->irq_lock, flags);
+ raw_spin_unlock_irqrestore(&gc->lock, flags);
return 0;
}
-static struct irq_chip pl061_irqchip = {
- .name = "GPIO",
- .irq_enable = pl061_irq_enable,
- .irq_disable = pl061_irq_disable,
- .irq_set_type = pl061_irq_type,
-};
-
static void pl061_irq_handler(unsigned irq, struct irq_desc *desc)
{
- struct list_head *chip_list = irq_get_handler_data(irq);
- struct list_head *ptr;
- struct pl061_gpio *chip;
-
- desc->irq_data.chip->irq_ack(&desc->irq_data);
- list_for_each(ptr, chip_list) {
- unsigned long pending;
- int offset;
+ unsigned long pending;
+ int offset;
+ struct pl061_gpio *chip = irq_desc_get_handler_data(desc);
+ struct irq_chip *irqchip = irq_desc_get_chip(desc);
- chip = list_entry(ptr, struct pl061_gpio, list);
- pending = readb(chip->base + GPIOMIS);
- writeb(pending, chip->base + GPIOIC);
-
- if (pending == 0)
- continue;
+ chained_irq_enter(irqchip, desc);
+ pending = readb(chip->base + GPIOMIS);
+ writeb(pending, chip->base + GPIOIC);
+ if (pending) {
for_each_set_bit(offset, &pending, PL061_GPIO_NR)
generic_handle_irq(pl061_to_irq(&chip->gc, offset));
}
- desc->irq_data.chip->irq_unmask(&desc->irq_data);
+
+ chained_irq_exit(irqchip, desc);
+}
+
+static void __init pl061_init_gc(struct pl061_gpio *chip, int irq_base)
+{
+ struct irq_chip_type *ct;
+
+ chip->irq_gc = irq_alloc_generic_chip("gpio-pl061", 1, irq_base,
+ chip->base, handle_simple_irq);
+ chip->irq_gc->private = chip;
+
+ ct = chip->irq_gc->chip_types;
+ ct->chip.irq_mask = irq_gc_mask_clr_bit;
+ ct->chip.irq_unmask = irq_gc_mask_set_bit;
+ ct->chip.irq_set_type = pl061_irq_type;
+ ct->chip.irq_set_wake = irq_gc_set_wake;
+ ct->regs.mask = GPIOIE;
+
+ irq_setup_generic_chip(chip->irq_gc, IRQ_MSK(PL061_GPIO_NR),
+ IRQ_GC_INIT_NESTED_LOCK, IRQ_NOREQUEST, 0);
}
static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
{
struct pl061_platform_data *pdata;
struct pl061_gpio *chip;
- struct list_head *chip_list;
int ret, irq, i;
- static DECLARE_BITMAP(init_irq, NR_IRQS);
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (chip == NULL)
chip->irq_base = pdata->irq_base;
} else if (dev->dev.of_node) {
chip->gc.base = -1;
- chip->irq_base = NO_IRQ;
+ chip->irq_base = 0;
} else {
ret = -ENODEV;
goto free_mem;
}
spin_lock_init(&chip->lock);
- spin_lock_init(&chip->irq_lock);
- INIT_LIST_HEAD(&chip->list);
chip->gc.direction_input = pl061_direction_input;
chip->gc.direction_output = pl061_direction_output;
* irq_chip support
*/
- if (chip->irq_base == NO_IRQ)
+ if (chip->irq_base <= 0)
return 0;
+ pl061_init_gc(chip, chip->irq_base);
+
writeb(0, chip->base + GPIOIE); /* disable irqs */
irq = dev->irq[0];
if (irq < 0) {
goto iounmap;
}
irq_set_chained_handler(irq, pl061_irq_handler);
- if (!test_and_set_bit(irq, init_irq)) { /* list initialized? */
- chip_list = kmalloc(sizeof(*chip_list), GFP_KERNEL);
- if (chip_list == NULL) {
- clear_bit(irq, init_irq);
- ret = -ENOMEM;
- goto iounmap;
- }
- INIT_LIST_HEAD(chip_list);
- irq_set_handler_data(irq, chip_list);
- } else
- chip_list = irq_get_handler_data(irq);
- list_add(&chip->list, chip_list);
+ irq_set_handler_data(irq, chip);
for (i = 0; i < PL061_GPIO_NR; i++) {
if (pdata) {
else
pl061_direction_input(&chip->gc, i);
}
-
- irq_set_chip_and_handler(i + chip->irq_base, &pl061_irqchip,
- handle_simple_irq);
- set_irq_flags(i+chip->irq_base, IRQF_VALID);
- irq_set_chip_data(i + chip->irq_base, chip);
}
+ amba_set_drvdata(dev, chip);
+
return 0;
iounmap:
return ret;
}
+#ifdef CONFIG_PM
+static int pl061_suspend(struct device *dev)
+{
+ struct pl061_gpio *chip = dev_get_drvdata(dev);
+ int offset;
+
+ chip->csave_regs.gpio_data = 0;
+ chip->csave_regs.gpio_dir = readb(chip->base + GPIODIR);
+ chip->csave_regs.gpio_is = readb(chip->base + GPIOIS);
+ chip->csave_regs.gpio_ibe = readb(chip->base + GPIOIBE);
+ chip->csave_regs.gpio_iev = readb(chip->base + GPIOIEV);
+ chip->csave_regs.gpio_ie = readb(chip->base + GPIOIE);
+
+ for (offset = 0; offset < PL061_GPIO_NR; offset++) {
+ if (chip->csave_regs.gpio_dir & (1 << offset))
+ chip->csave_regs.gpio_data |=
+ pl061_get_value(&chip->gc, offset) << offset;
+ }
+
+ return 0;
+}
+
+static int pl061_resume(struct device *dev)
+{
+ struct pl061_gpio *chip = dev_get_drvdata(dev);
+ int offset;
+
+ for (offset = 0; offset < PL061_GPIO_NR; offset++) {
+ if (chip->csave_regs.gpio_dir & (1 << offset))
+ pl061_direction_output(&chip->gc, offset,
+ chip->csave_regs.gpio_data &
+ (1 << offset));
+ else
+ pl061_direction_input(&chip->gc, offset);
+ }
+
+ writeb(chip->csave_regs.gpio_is, chip->base + GPIOIS);
+ writeb(chip->csave_regs.gpio_ibe, chip->base + GPIOIBE);
+ writeb(chip->csave_regs.gpio_iev, chip->base + GPIOIEV);
+ writeb(chip->csave_regs.gpio_ie, chip->base + GPIOIE);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(pl061_dev_pm_ops, pl061_suspend, pl061_resume);
+#endif
+
static struct amba_id pl061_ids[] = {
{
.id = 0x00041061,
static struct amba_driver pl061_gpio_driver = {
.drv = {
.name = "pl061_gpio",
+#ifdef CONFIG_PM
+ .pm = &pl061_dev_pm_ops,
+#endif
},
.id_table = pl061_ids,
.probe = pl061_probe,
projects / firefly-linux-kernel-4.4.55.git / blobdiff