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yaml
---
r: 271158
b: refs/heads/master
c: 38eb18a
h: refs/heads/master
v: v3
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Tomoya MORINAGA authored and Grant Likely committed Oct 5, 2011
1 parent 0f50930 commit 5e17b91
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Showing 3 changed files with 189 additions and 1 deletion.
2 changes: 1 addition & 1 deletion [refs]
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@@ -1,2 +1,2 @@
---
refs/heads/master: e98bed7f0fa847492db8316db4605f2681f39868
refs/heads/master: 38eb18a6f92da886fc1af509d25e8f7a49e23d9a
1 change: 1 addition & 0 deletions trunk/drivers/gpio/Kconfig
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Expand Up @@ -388,6 +388,7 @@ 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.
Expand Down
187 changes: 187 additions & 0 deletions trunk/drivers/gpio/gpio-pch.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand Down Expand Up @@ -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.
Expand All @@ -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;
Expand All @@ -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,
Expand All @@ -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;
};
Expand Down Expand Up @@ -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);
Expand All @@ -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 */
Expand All @@ -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;
Expand All @@ -196,13 +224,138 @@ 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,
const struct pci_device_id *id)
{
s32 ret;
struct pch_gpio *chip;
int irq_base;

chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (chip == NULL)
Expand Down Expand Up @@ -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);

Expand All @@ -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");
Expand Down

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