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Subject[PATCH 6/6 v5] pch_gpio: Support interrupt function
Date

Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
---
drivers/gpio/Kconfig | 1 +
drivers/gpio/pch_gpio.c | 187 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 188 insertions(+), 0 deletions(-)
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 2967002..bd64a55 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -352,6 +352,7 @@ config GPIO_LANGWELL
config GPIO_PCH
tristate "Intel EG20T PCH / OKI SEMICONDUCTOR ML7223 IOH GPIO"
depends on PCI && X86
+ select GENERIC_IRQ_CHIP
help
This driver is for PCH(Platform controller Hub) GPIO of Intel Topcliff
which is an IOH(Input/Output Hub) for x86 embedded processor.
diff --git a/drivers/gpio/pch_gpio.c b/drivers/gpio/pch_gpio.c
index 7f773af..46b5209 100644
--- a/drivers/gpio/pch_gpio.c
+++ b/drivers/gpio/pch_gpio.c
@@ -17,6 +17,17 @@
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+
+#define PCH_EDGE_FALLING 0
+#define PCH_EDGE_RISING BIT(0)
+#define PCH_LEVEL_L BIT(1)
+#define PCH_LEVEL_H (BIT(0) | BIT(1))
+#define PCH_EDGE_BOTH BIT(2)
+#define PCH_IM_MASK (BIT(0) | BIT(1) | BIT(2))
+
+#define PCH_IRQ_BASE 24

struct pch_regs {
u32 ien;
@@ -50,6 +61,8 @@ static int gpio_pins[] = {

/**
* struct pch_gpio_reg_data - The register store data.
+ * @ien_reg: To store contents of IEN register.
+ * @imask_reg: To store contents of IMASK register.
* @po_reg: To store contents of PO register.
* @pm_reg: To store contents of PM register.
* @im0_reg: To store contents of IM0 register.
@@ -58,6 +71,8 @@ static int gpio_pins[] = {
* (Only ML7223 Bus-n)
*/
struct pch_gpio_reg_data {
+ u32 ien_reg;
+ u32 imask_reg;
u32 po_reg;
u32 pm_reg;
u32 im0_reg;
@@ -73,6 +88,8 @@ struct pch_gpio_reg_data {
* @gpio: Data for GPIO infrastructure.
* @pch_gpio_reg: Memory mapped Register data is saved here
* when suspend.
+ * @lock: Used for register access protection
+ * @irq_base: Save base of IRQ number for interrupt
* @ioh: IOH ID
* @spinlock: Used for register access protection in
* interrupt context pch_irq_mask,
@@ -85,6 +102,7 @@ struct pch_gpio {
struct gpio_chip gpio;
struct pch_gpio_reg_data pch_gpio_reg;
struct mutex lock;
+ int irq_base;
enum pch_type_t ioh;
spinlock_t spinlock;
};
@@ -155,6 +173,8 @@ static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
*/
static void pch_gpio_save_reg_conf(struct pch_gpio *chip)
{
+ chip->pch_gpio_reg.ien_reg = ioread32(&chip->reg->ien);
+ chip->pch_gpio_reg.imask_reg = ioread32(&chip->reg->imask);
chip->pch_gpio_reg.po_reg = ioread32(&chip->reg->po);
chip->pch_gpio_reg.pm_reg = ioread32(&chip->reg->pm);
chip->pch_gpio_reg.im0_reg = ioread32(&chip->reg->im0);
@@ -170,6 +190,8 @@ static void pch_gpio_save_reg_conf(struct pch_gpio *chip)
*/
static void pch_gpio_restore_reg_conf(struct pch_gpio *chip)
{
+ iowrite32(chip->pch_gpio_reg.ien_reg, &chip->reg->ien);
+ iowrite32(chip->pch_gpio_reg.imask_reg, &chip->reg->imask);
/* to store contents of PO register */
iowrite32(chip->pch_gpio_reg.po_reg, &chip->reg->po);
/* to store contents of PM register */
@@ -182,6 +204,12 @@ static void pch_gpio_restore_reg_conf(struct pch_gpio *chip)
&chip->reg->gpio_use_sel);
}

+static int pch_gpio_to_irq(struct gpio_chip *gpio, unsigned offset)
+{
+ struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
+ return chip->irq_base + offset;
+}
+
static void pch_gpio_setup(struct pch_gpio *chip)
{
struct gpio_chip *gpio = &chip->gpio;
@@ -196,6 +224,130 @@ static void pch_gpio_setup(struct pch_gpio *chip)
gpio->base = -1;
gpio->ngpio = gpio_pins[chip->ioh];
gpio->can_sleep = 0;
+ gpio->to_irq = pch_gpio_to_irq;
+}
+
+static int pch_irq_type(struct irq_data *d, unsigned int type)
+{
+ u32 im;
+ u32 *im_reg;
+ u32 ien;
+ u32 im_pos;
+ int ch;
+ unsigned long flags;
+ u32 val;
+ int irq = d->irq;
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct pch_gpio *chip = gc->private;
+
+ ch = irq - chip->irq_base;
+ if (irq <= chip->irq_base + 7) {
+ im_reg = &chip->reg->im0;
+ im_pos = ch;
+ } else {
+ im_reg = &chip->reg->im1;
+ im_pos = ch - 8;
+ }
+ dev_dbg(chip->dev, "%s:irq=%d type=%d ch=%d pos=%d\n",
+ __func__, irq, type, ch, im_pos);
+
+ spin_lock_irqsave(&chip->spinlock, flags);
+
+ switch (type) {
+ case IRQ_TYPE_EDGE_RISING:
+ val = PCH_EDGE_RISING;
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ val = PCH_EDGE_FALLING;
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ val = PCH_EDGE_BOTH;
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ val = PCH_LEVEL_H;
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ val = PCH_LEVEL_L;
+ break;
+ case IRQ_TYPE_PROBE:
+ goto end;
+ default:
+ dev_warn(chip->dev, "%s: unknown type(%dd)",
+ __func__, type);
+ goto end;
+ }
+
+ /* Set interrupt mode */
+ im = ioread32(im_reg) & ~(PCH_IM_MASK << (im_pos * 4));
+ iowrite32(im | (val << (im_pos * 4)), im_reg);
+
+ /* iclr */
+ iowrite32(BIT(ch), &chip->reg->iclr);
+
+ /* IMASKCLR */
+ iowrite32(BIT(ch), &chip->reg->imaskclr);
+
+ /* Enable interrupt */
+ ien = ioread32(&chip->reg->ien);
+ iowrite32(ien | BIT(ch), &chip->reg->ien);
+end:
+ spin_unlock_irqrestore(&chip->spinlock, flags);
+
+ return 0;
+}
+
+static void pch_irq_unmask(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct pch_gpio *chip = gc->private;
+
+ iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->imaskclr);
+}
+
+static void pch_irq_mask(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct pch_gpio *chip = gc->private;
+
+ iowrite32(1 << (d->irq - chip->irq_base), &chip->reg->imask);
+}
+
+static irqreturn_t pch_gpio_handler(int irq, void *dev_id)
+{
+ struct pch_gpio *chip = dev_id;
+ u32 reg_val = ioread32(&chip->reg->istatus);
+ int i;
+ int ret = IRQ_NONE;
+
+ for (i = 0; i < gpio_pins[chip->ioh]; i++) {
+ if (reg_val & BIT(i)) {
+ dev_dbg(chip->dev, "%s:[%d]:irq=%d status=0x%x\n",
+ __func__, i, irq, reg_val);
+ iowrite32(BIT(i), &chip->reg->iclr);
+ generic_handle_irq(chip->irq_base + i);
+ ret = IRQ_HANDLED;
+ }
+ }
+ return ret;
+}
+
+static __devinit void pch_gpio_alloc_generic_chip(struct pch_gpio *chip,
+ unsigned int irq_start, unsigned int num)
+{
+ struct irq_chip_generic *gc;
+ struct irq_chip_type *ct;
+
+ gc = irq_alloc_generic_chip("pch_gpio", 1, irq_start, chip->base,
+ handle_simple_irq);
+ gc->private = chip;
+ ct = gc->chip_types;
+
+ ct->chip.irq_mask = pch_irq_mask;
+ ct->chip.irq_unmask = pch_irq_unmask;
+ ct->chip.irq_set_type = pch_irq_type;
+
+ irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
+ IRQ_NOREQUEST | IRQ_NOPROBE, 0);
}

static int __devinit pch_gpio_probe(struct pci_dev *pdev,
@@ -203,6 +355,7 @@ static int __devinit pch_gpio_probe(struct pci_dev *pdev,
{
s32 ret;
struct pch_gpio *chip;
+ int irq_base;

chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (chip == NULL)
@@ -245,8 +398,36 @@ static int __devinit pch_gpio_probe(struct pci_dev *pdev,
goto err_gpiochip_add;
}

+ irq_base = irq_alloc_descs(-1, 0, gpio_pins[chip->ioh], GFP_KERNEL);
+ if (irq_base < 0) {
+ dev_warn(&pdev->dev, "PCH gpio: Failed to get IRQ base num\n");
+ chip->irq_base = -1;
+ goto end;
+ }
+ chip->irq_base = irq_base;
+
+ ret = request_irq(pdev->irq, pch_gpio_handler,
+ IRQF_SHARED, KBUILD_MODNAME, chip);
+ if (ret != 0) {
+ dev_err(&pdev->dev,
+ "%s request_irq failed\n", __func__);
+ goto err_request_irq;
+ }
+
+ pch_gpio_alloc_generic_chip(chip, irq_base, gpio_pins[chip->ioh]);
+
+ /* Initialize interrupt ien register */
+ iowrite32(0, &chip->reg->ien);
+end:
return 0;

+err_request_irq:
+ irq_free_descs(irq_base, gpio_pins[chip->ioh]);
+
+ ret = gpiochip_remove(&chip->gpio);
+ if (ret)
+ dev_err(&pdev->dev, "%s gpiochip_remove failed\n", __func__);
+
err_gpiochip_add:
pci_iounmap(pdev, chip->base);

@@ -267,6 +448,12 @@ static void __devexit pch_gpio_remove(struct pci_dev *pdev)
int err;
struct pch_gpio *chip = pci_get_drvdata(pdev);

+ if (chip->irq_base != -1) {
+ free_irq(pdev->irq, chip);
+
+ irq_free_descs(chip->irq_base, gpio_pins[chip->ioh]);
+ }
+
err = gpiochip_remove(&chip->gpio);
if (err)
dev_err(&pdev->dev, "Failed gpiochip_remove\n");
--
1.7.4.4


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