forked from mirrors/linux
33300571b1
with the "for (; i != 0; i--)" sytax, i-- will be executed after the iteration. thus dev_err shows wrong i value. Switch to "while(--i >= 0)" which is better in readability. Signed-off-by: Axel Lin <axel.lin@gmail.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
357 lines
8.2 KiB
C
357 lines
8.2 KiB
C
/*
|
|
* Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; version 2 of the License.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/gpio.h>
|
|
|
|
#define PCI_VENDOR_ID_ROHM 0x10DB
|
|
|
|
struct ioh_reg_comn {
|
|
u32 ien;
|
|
u32 istatus;
|
|
u32 idisp;
|
|
u32 iclr;
|
|
u32 imask;
|
|
u32 imaskclr;
|
|
u32 po;
|
|
u32 pi;
|
|
u32 pm;
|
|
u32 im_0;
|
|
u32 im_1;
|
|
u32 reserved;
|
|
};
|
|
|
|
struct ioh_regs {
|
|
struct ioh_reg_comn regs[8];
|
|
u32 reserve1[16];
|
|
u32 ioh_sel_reg[4];
|
|
u32 reserve2[11];
|
|
u32 srst;
|
|
};
|
|
|
|
/**
|
|
* struct ioh_gpio_reg_data - The register store data.
|
|
* @po_reg: To store contents of PO register.
|
|
* @pm_reg: To store contents of PM register.
|
|
*/
|
|
struct ioh_gpio_reg_data {
|
|
u32 po_reg;
|
|
u32 pm_reg;
|
|
};
|
|
|
|
/**
|
|
* struct ioh_gpio - GPIO private data structure.
|
|
* @base: PCI base address of Memory mapped I/O register.
|
|
* @reg: Memory mapped IOH GPIO register list.
|
|
* @dev: Pointer to device structure.
|
|
* @gpio: Data for GPIO infrastructure.
|
|
* @ioh_gpio_reg: Memory mapped Register data is saved here
|
|
* when suspend.
|
|
* @ch: Indicate GPIO channel
|
|
*/
|
|
struct ioh_gpio {
|
|
void __iomem *base;
|
|
struct ioh_regs __iomem *reg;
|
|
struct device *dev;
|
|
struct gpio_chip gpio;
|
|
struct ioh_gpio_reg_data ioh_gpio_reg;
|
|
struct mutex lock;
|
|
int ch;
|
|
};
|
|
|
|
static const int num_ports[] = {6, 12, 16, 16, 15, 16, 16, 12};
|
|
|
|
static void ioh_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
|
|
{
|
|
u32 reg_val;
|
|
struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
|
|
|
|
mutex_lock(&chip->lock);
|
|
reg_val = ioread32(&chip->reg->regs[chip->ch].po);
|
|
if (val)
|
|
reg_val |= (1 << nr);
|
|
else
|
|
reg_val &= ~(1 << nr);
|
|
|
|
iowrite32(reg_val, &chip->reg->regs[chip->ch].po);
|
|
mutex_unlock(&chip->lock);
|
|
}
|
|
|
|
static int ioh_gpio_get(struct gpio_chip *gpio, unsigned nr)
|
|
{
|
|
struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
|
|
|
|
return ioread32(&chip->reg->regs[chip->ch].pi) & (1 << nr);
|
|
}
|
|
|
|
static int ioh_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
|
|
int val)
|
|
{
|
|
struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
|
|
u32 pm;
|
|
u32 reg_val;
|
|
|
|
mutex_lock(&chip->lock);
|
|
pm = ioread32(&chip->reg->regs[chip->ch].pm) &
|
|
((1 << num_ports[chip->ch]) - 1);
|
|
pm |= (1 << nr);
|
|
iowrite32(pm, &chip->reg->regs[chip->ch].pm);
|
|
|
|
reg_val = ioread32(&chip->reg->regs[chip->ch].po);
|
|
if (val)
|
|
reg_val |= (1 << nr);
|
|
else
|
|
reg_val &= ~(1 << nr);
|
|
iowrite32(reg_val, &chip->reg->regs[chip->ch].po);
|
|
|
|
mutex_unlock(&chip->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ioh_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
|
|
{
|
|
struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
|
|
u32 pm;
|
|
|
|
mutex_lock(&chip->lock);
|
|
pm = ioread32(&chip->reg->regs[chip->ch].pm) &
|
|
((1 << num_ports[chip->ch]) - 1);
|
|
pm &= ~(1 << nr);
|
|
iowrite32(pm, &chip->reg->regs[chip->ch].pm);
|
|
mutex_unlock(&chip->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
/*
|
|
* Save register configuration and disable interrupts.
|
|
*/
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* This function restores the register configuration of the GPIO device.
|
|
*/
|
|
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);
|
|
}
|
|
#endif
|
|
|
|
static void ioh_gpio_setup(struct ioh_gpio *chip, int num_port)
|
|
{
|
|
struct gpio_chip *gpio = &chip->gpio;
|
|
|
|
gpio->label = dev_name(chip->dev);
|
|
gpio->owner = THIS_MODULE;
|
|
gpio->direction_input = ioh_gpio_direction_input;
|
|
gpio->get = ioh_gpio_get;
|
|
gpio->direction_output = ioh_gpio_direction_output;
|
|
gpio->set = ioh_gpio_set;
|
|
gpio->dbg_show = NULL;
|
|
gpio->base = -1;
|
|
gpio->ngpio = num_port;
|
|
gpio->can_sleep = 0;
|
|
}
|
|
|
|
static int __devinit ioh_gpio_probe(struct pci_dev *pdev,
|
|
const struct pci_device_id *id)
|
|
{
|
|
int ret;
|
|
int i;
|
|
struct ioh_gpio *chip;
|
|
void __iomem *base;
|
|
void __iomem *chip_save;
|
|
|
|
ret = pci_enable_device(pdev);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "%s : pci_enable_device failed", __func__);
|
|
goto err_pci_enable;
|
|
}
|
|
|
|
ret = pci_request_regions(pdev, KBUILD_MODNAME);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "pci_request_regions failed-%d", ret);
|
|
goto err_request_regions;
|
|
}
|
|
|
|
base = pci_iomap(pdev, 1, 0);
|
|
if (base == 0) {
|
|
dev_err(&pdev->dev, "%s : pci_iomap failed", __func__);
|
|
ret = -ENOMEM;
|
|
goto err_iomap;
|
|
}
|
|
|
|
chip_save = kzalloc(sizeof(*chip) * 8, GFP_KERNEL);
|
|
if (chip_save == NULL) {
|
|
dev_err(&pdev->dev, "%s : kzalloc failed", __func__);
|
|
ret = -ENOMEM;
|
|
goto err_kzalloc;
|
|
}
|
|
|
|
chip = chip_save;
|
|
for (i = 0; i < 8; i++, chip++) {
|
|
chip->dev = &pdev->dev;
|
|
chip->base = base;
|
|
chip->reg = chip->base;
|
|
chip->ch = i;
|
|
mutex_init(&chip->lock);
|
|
ioh_gpio_setup(chip, num_ports[i]);
|
|
ret = gpiochip_add(&chip->gpio);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "IOH gpio: Failed to register GPIO\n");
|
|
goto err_gpiochip_add;
|
|
}
|
|
}
|
|
|
|
chip = chip_save;
|
|
pci_set_drvdata(pdev, chip);
|
|
|
|
return 0;
|
|
|
|
err_gpiochip_add:
|
|
while (--i >= 0) {
|
|
chip--;
|
|
ret = gpiochip_remove(&chip->gpio);
|
|
if (ret)
|
|
dev_err(&pdev->dev, "Failed gpiochip_remove(%d)\n", i);
|
|
}
|
|
kfree(chip_save);
|
|
|
|
err_kzalloc:
|
|
pci_iounmap(pdev, base);
|
|
|
|
err_iomap:
|
|
pci_release_regions(pdev);
|
|
|
|
err_request_regions:
|
|
pci_disable_device(pdev);
|
|
|
|
err_pci_enable:
|
|
|
|
dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
static void __devexit ioh_gpio_remove(struct pci_dev *pdev)
|
|
{
|
|
int err;
|
|
int i;
|
|
struct ioh_gpio *chip = pci_get_drvdata(pdev);
|
|
void __iomem *chip_save;
|
|
|
|
chip_save = chip;
|
|
for (i = 0; i < 8; i++, chip++) {
|
|
err = gpiochip_remove(&chip->gpio);
|
|
if (err)
|
|
dev_err(&pdev->dev, "Failed gpiochip_remove\n");
|
|
}
|
|
|
|
chip = chip_save;
|
|
pci_iounmap(pdev, chip->base);
|
|
pci_release_regions(pdev);
|
|
pci_disable_device(pdev);
|
|
kfree(chip);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int ioh_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
|
|
{
|
|
s32 ret;
|
|
struct ioh_gpio *chip = pci_get_drvdata(pdev);
|
|
|
|
ioh_gpio_save_reg_conf(chip);
|
|
ioh_gpio_restore_reg_conf(chip);
|
|
|
|
ret = pci_save_state(pdev);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret);
|
|
return ret;
|
|
}
|
|
pci_disable_device(pdev);
|
|
pci_set_power_state(pdev, PCI_D0);
|
|
ret = pci_enable_wake(pdev, PCI_D0, 1);
|
|
if (ret)
|
|
dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ioh_gpio_resume(struct pci_dev *pdev)
|
|
{
|
|
s32 ret;
|
|
struct ioh_gpio *chip = pci_get_drvdata(pdev);
|
|
|
|
ret = pci_enable_wake(pdev, PCI_D0, 0);
|
|
|
|
pci_set_power_state(pdev, PCI_D0);
|
|
ret = pci_enable_device(pdev);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret);
|
|
return ret;
|
|
}
|
|
pci_restore_state(pdev);
|
|
|
|
iowrite32(0x01, &chip->reg->srst);
|
|
iowrite32(0x00, &chip->reg->srst);
|
|
ioh_gpio_restore_reg_conf(chip);
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
#define ioh_gpio_suspend NULL
|
|
#define ioh_gpio_resume NULL
|
|
#endif
|
|
|
|
static DEFINE_PCI_DEVICE_TABLE(ioh_gpio_pcidev_id) = {
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x802E) },
|
|
{ 0, }
|
|
};
|
|
MODULE_DEVICE_TABLE(pci, ioh_gpio_pcidev_id);
|
|
|
|
static struct pci_driver ioh_gpio_driver = {
|
|
.name = "ml_ioh_gpio",
|
|
.id_table = ioh_gpio_pcidev_id,
|
|
.probe = ioh_gpio_probe,
|
|
.remove = __devexit_p(ioh_gpio_remove),
|
|
.suspend = ioh_gpio_suspend,
|
|
.resume = ioh_gpio_resume
|
|
};
|
|
|
|
static int __init ioh_gpio_pci_init(void)
|
|
{
|
|
return pci_register_driver(&ioh_gpio_driver);
|
|
}
|
|
module_init(ioh_gpio_pci_init);
|
|
|
|
static void __exit ioh_gpio_pci_exit(void)
|
|
{
|
|
pci_unregister_driver(&ioh_gpio_driver);
|
|
}
|
|
module_exit(ioh_gpio_pci_exit);
|
|
|
|
MODULE_DESCRIPTION("OKI SEMICONDUCTOR ML-IOH series GPIO Driver");
|
|
MODULE_LICENSE("GPL");
|