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gpio-ml-ioh: Support interrupt function

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Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Tomoya MORINAGA 2011-08-05 13:04:21 +09:00 committed by Grant Likely
parent 45d198c4cf
commit 54be566317
2 changed files with 207 additions and 3 deletions
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1
drivers/gpio/Kconfig
View file

@ -402,6 +402,7 @@ config GPIO_PCH
config GPIO_ML_IOH
tristate "OKI SEMICONDUCTOR ML7213 IOH GPIO support"
depends on PCI
select GENERIC_IRQ_CHIP
help
ML7213 is companion chip for Intel Atom E6xx series.
This driver can be used for OKI SEMICONDUCTOR ML7213 IOH(Input/Output

209
drivers/gpio/gpio-ml-ioh.c
View file

@ -18,6 +18,17 @@
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#define IOH_EDGE_FALLING 0
#define IOH_EDGE_RISING BIT(0)
#define IOH_LEVEL_L BIT(1)
#define IOH_LEVEL_H (BIT(0) | BIT(1))
#define IOH_EDGE_BOTH BIT(2)
#define IOH_IM_MASK (BIT(0) | BIT(1) | BIT(2))
#define IOH_IRQ_BASE 0
#define PCI_VENDOR_ID_ROHM 0x10DB
@ -46,12 +57,20 @@ struct ioh_regs {
/**
* struct ioh_gpio_reg_data - The register store data.
* @ien_reg To store contents of interrupt enable register.
* @imask_reg: To store contents of interrupt mask regist
* @po_reg: To store contents of PO register.
* @pm_reg: To store contents of PM register.
* @im0_reg: To store contents of interrupt mode regist0
* @im1_reg: To store contents of interrupt mode regist1
*/
struct ioh_gpio_reg_data {
u32 ien_reg;
u32 imask_reg;
u32 po_reg;
u32 pm_reg;
u32 im0_reg;
u32 im1_reg;
};
/**
@ -63,6 +82,9 @@ struct ioh_gpio_reg_data {
* @ioh_gpio_reg: Memory mapped Register data is saved here
* when suspend.
* @ch: Indicate GPIO channel
* @irq_base: Save base of IRQ number for interrupt
* @spinlock: Used for register access protection in
* interrupt context ioh_irq_type and PM;
*/
struct ioh_gpio {
void __iomem *base;
@ -72,6 +94,8 @@ struct ioh_gpio {
struct ioh_gpio_reg_data ioh_gpio_reg;
struct mutex lock;
int ch;
int irq_base;
spinlock_t spinlock;
};
static const int num_ports[] = {6, 12, 16, 16, 15, 16, 16, 12};
@ -147,6 +171,10 @@ static void ioh_gpio_save_reg_conf(struct ioh_gpio *chip)
{
chip->ioh_gpio_reg.po_reg = ioread32(&chip->reg->regs[chip->ch].po);
chip->ioh_gpio_reg.pm_reg = ioread32(&chip->reg->regs[chip->ch].pm);
chip->ioh_gpio_reg.ien_reg = ioread32(&chip->reg->regs[chip->ch].ien);
chip->ioh_gpio_reg.imask_reg = ioread32(&chip->reg->regs[chip->ch].imask);
chip->ioh_gpio_reg.im0_reg = ioread32(&chip->reg->regs[chip->ch].im_0);
chip->ioh_gpio_reg.im1_reg = ioread32(&chip->reg->regs[chip->ch].im_1);
}
/*
@ -154,13 +182,21 @@ static void ioh_gpio_save_reg_conf(struct ioh_gpio *chip)
*/
static void ioh_gpio_restore_reg_conf(struct ioh_gpio *chip)
{
/* to store contents of PO register */
iowrite32(chip->ioh_gpio_reg.po_reg, &chip->reg->regs[chip->ch].po);
/* to store contents of PM register */
iowrite32(chip->ioh_gpio_reg.pm_reg, &chip->reg->regs[chip->ch].pm);
iowrite32(chip->ioh_gpio_reg.ien_reg, &chip->reg->regs[chip->ch].ien);
iowrite32(chip->ioh_gpio_reg.imask_reg, &chip->reg->regs[chip->ch].imask);
iowrite32(chip->ioh_gpio_reg.im0_reg, &chip->reg->regs[chip->ch].im_0);
iowrite32(chip->ioh_gpio_reg.im1_reg, &chip->reg->regs[chip->ch].im_1);
}
#endif
static int ioh_gpio_to_irq(struct gpio_chip *gpio, unsigned offset)
{
struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
return chip->irq_base + offset;
}
static void ioh_gpio_setup(struct ioh_gpio *chip, int num_port)
{
struct gpio_chip *gpio = &chip->gpio;
@ -175,16 +211,148 @@ static void ioh_gpio_setup(struct ioh_gpio *chip, int num_port)
gpio->base = -1;
gpio->ngpio = num_port;
gpio->can_sleep = 0;
gpio->to_irq = ioh_gpio_to_irq;
}
static int ioh_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 ioh_gpio *chip = gc->private;
ch = irq - chip->irq_base;
if (irq <= chip->irq_base + 7) {
im_reg = &chip->reg->regs[chip->ch].im_0;
im_pos = ch;
} else {
im_reg = &chip->reg->regs[chip->ch].im_1;
im_pos = ch - 8;
}
dev_dbg(chip->dev, "%s:irq=%d type=%d ch=%d pos=%d type=%d\n",
__func__, irq, type, ch, im_pos, type);
spin_lock_irqsave(&chip->spinlock, flags);
switch (type) {
case IRQ_TYPE_EDGE_RISING:
val = IOH_EDGE_RISING;
break;
case IRQ_TYPE_EDGE_FALLING:
val = IOH_EDGE_FALLING;
break;
case IRQ_TYPE_EDGE_BOTH:
val = IOH_EDGE_BOTH;
break;
case IRQ_TYPE_LEVEL_HIGH:
val = IOH_LEVEL_H;
break;
case IRQ_TYPE_LEVEL_LOW:
val = IOH_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) & ~(IOH_IM_MASK << (im_pos * 4));
iowrite32(im | (val << (im_pos * 4)), im_reg);
/* iclr */
iowrite32(BIT(ch), &chip->reg->regs[chip->ch].iclr);
/* IMASKCLR */
iowrite32(BIT(ch), &chip->reg->regs[chip->ch].imaskclr);
/* Enable interrupt */
ien = ioread32(&chip->reg->regs[chip->ch].ien);
iowrite32(ien | BIT(ch), &chip->reg->regs[chip->ch].ien);
end:
spin_unlock_irqrestore(&chip->spinlock, flags);
return 0;
}
static void ioh_irq_unmask(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct ioh_gpio *chip = gc->private;
iowrite32(1 << (d->irq - chip->irq_base),
&chip->reg->regs[chip->ch].imaskclr);
}
static void ioh_irq_mask(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct ioh_gpio *chip = gc->private;
iowrite32(1 << (d->irq - chip->irq_base),
&chip->reg->regs[chip->ch].imask);
}
static irqreturn_t ioh_gpio_handler(int irq, void *dev_id)
{
struct ioh_gpio *chip = dev_id;
u32 reg_val;
int i, j;
int ret = IRQ_NONE;
for (i = 0; i < 8; i++) {
reg_val = ioread32(&chip->reg->regs[i].istatus);
for (j = 0; j < num_ports[i]; j++) {
if (reg_val & BIT(j)) {
dev_dbg(chip->dev,
"%s:[%d]:irq=%d status=0x%x\n",
__func__, j, irq, reg_val);
iowrite32(BIT(j),
&chip->reg->regs[chip->ch].iclr);
generic_handle_irq(chip->irq_base + j);
ret = IRQ_HANDLED;
}
}
}
return ret;
}
static __devinit void ioh_gpio_alloc_generic_chip(struct ioh_gpio *chip,
unsigned int irq_start, unsigned int num)
{
struct irq_chip_generic *gc;
struct irq_chip_type *ct;
gc = irq_alloc_generic_chip("ioh_gpio", 1, irq_start, chip->base,
handle_simple_irq);
gc->private = chip;
ct = gc->chip_types;
ct->chip.irq_mask = ioh_irq_mask;
ct->chip.irq_unmask = ioh_irq_unmask;
ct->chip.irq_set_type = ioh_irq_type;
irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
IRQ_NOREQUEST | IRQ_NOPROBE, 0);
}
static int __devinit ioh_gpio_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
int ret;
int i;
int i, j;
struct ioh_gpio *chip;
void __iomem *base;
void __iomem *chip_save;
int irq_base;
ret = pci_enable_device(pdev);
if (ret) {
@ -228,10 +396,41 @@ static int __devinit ioh_gpio_probe(struct pci_dev *pdev,
}
chip = chip_save;
for (j = 0; j < 8; j++, chip++) {
irq_base = irq_alloc_descs(-1, IOH_IRQ_BASE, num_ports[j],
GFP_KERNEL);
if (irq_base < 0) {
dev_warn(&pdev->dev,
"ml_ioh_gpio: Failed to get IRQ base num\n");
chip->irq_base = -1;
goto err_irq_alloc_descs;
}
chip->irq_base = irq_base;
ioh_gpio_alloc_generic_chip(chip, irq_base, num_ports[j]);
}
chip = chip_save;
ret = request_irq(pdev->irq, ioh_gpio_handler,
IRQF_SHARED, KBUILD_MODNAME, chip);
if (ret != 0) {
dev_err(&pdev->dev,
"%s request_irq failed\n", __func__);
goto err_request_irq;
}
pci_set_drvdata(pdev, chip);
return 0;
err_request_irq:
chip = chip_save;
err_irq_alloc_descs:
while (--j >= 0) {
chip--;
irq_free_descs(chip->irq_base, num_ports[j]);
}
chip = chip_save;
err_gpiochip_add:
while (--i >= 0) {
chip--;
@ -264,7 +463,11 @@ static void __devexit ioh_gpio_remove(struct pci_dev *pdev)
void __iomem *chip_save;
chip_save = chip;
free_irq(pdev->irq, chip);
for (i = 0; i < 8; i++, chip++) {
irq_free_descs(chip->irq_base, num_ports[i]);
err = gpiochip_remove(&chip->gpio);
if (err)
dev_err(&pdev->dev, "Failed gpiochip_remove\n");