2 * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
17 #include <linux/kernel.h>
18 #include <linux/pci.h>
19 #include <linux/gpio.h>
21 #define PCH_GPIO_ALL_PINS 0xfff /* Mask for GPIO pins 0 to 11 */
22 #define GPIO_NUM_PINS 12 /* Specifies number of GPIO PINS GPIO0-GPIO11 */
41 * struct pch_gpio_reg_data - The register store data.
42 * @po_reg: To store contents of PO register.
43 * @pm_reg: To store contents of PM register.
45 struct pch_gpio_reg_data {
51 * struct pch_gpio - GPIO private data structure.
52 * @base: PCI base address of Memory mapped I/O register.
53 * @reg: Memory mapped PCH GPIO register list.
54 * @dev: Pointer to device structure.
55 * @gpio: Data for GPIO infrastructure.
56 * @pch_gpio_reg: Memory mapped Register data is saved here
61 struct pch_regs __iomem *reg;
63 struct gpio_chip gpio;
64 struct pch_gpio_reg_data pch_gpio_reg;
68 static void pch_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
71 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
73 mutex_lock(&chip->lock);
74 reg_val = ioread32(&chip->reg->po);
78 reg_val &= ~(1 << nr);
80 iowrite32(reg_val, &chip->reg->po);
81 mutex_unlock(&chip->lock);
84 static int pch_gpio_get(struct gpio_chip *gpio, unsigned nr)
86 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
88 return ioread32(&chip->reg->pi) & (1 << nr);
91 static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
94 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
98 mutex_lock(&chip->lock);
99 pm = ioread32(&chip->reg->pm) & PCH_GPIO_ALL_PINS;
101 iowrite32(pm, &chip->reg->pm);
103 reg_val = ioread32(&chip->reg->po);
105 reg_val |= (1 << nr);
107 reg_val &= ~(1 << nr);
108 iowrite32(reg_val, &chip->reg->po);
110 mutex_unlock(&chip->lock);
115 static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
117 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
120 mutex_lock(&chip->lock);
121 pm = ioread32(&chip->reg->pm) & PCH_GPIO_ALL_PINS; /*bits 0-11*/
123 iowrite32(pm, &chip->reg->pm);
124 mutex_unlock(&chip->lock);
130 * Save register configuration and disable interrupts.
132 static void pch_gpio_save_reg_conf(struct pch_gpio *chip)
134 chip->pch_gpio_reg.po_reg = ioread32(&chip->reg->po);
135 chip->pch_gpio_reg.pm_reg = ioread32(&chip->reg->pm);
139 * This function restores the register configuration of the GPIO device.
141 static void pch_gpio_restore_reg_conf(struct pch_gpio *chip)
143 /* to store contents of PO register */
144 iowrite32(chip->pch_gpio_reg.po_reg, &chip->reg->po);
145 /* to store contents of PM register */
146 iowrite32(chip->pch_gpio_reg.pm_reg, &chip->reg->pm);
149 static void pch_gpio_setup(struct pch_gpio *chip)
151 struct gpio_chip *gpio = &chip->gpio;
153 gpio->label = dev_name(chip->dev);
154 gpio->owner = THIS_MODULE;
155 gpio->direction_input = pch_gpio_direction_input;
156 gpio->get = pch_gpio_get;
157 gpio->direction_output = pch_gpio_direction_output;
158 gpio->set = pch_gpio_set;
159 gpio->dbg_show = NULL;
161 gpio->ngpio = GPIO_NUM_PINS;
165 static int __devinit pch_gpio_probe(struct pci_dev *pdev,
166 const struct pci_device_id *id)
169 struct pch_gpio *chip;
171 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
175 chip->dev = &pdev->dev;
176 ret = pci_enable_device(pdev);
178 dev_err(&pdev->dev, "%s : pci_enable_device FAILED", __func__);
182 ret = pci_request_regions(pdev, KBUILD_MODNAME);
184 dev_err(&pdev->dev, "pci_request_regions FAILED-%d", ret);
185 goto err_request_regions;
188 chip->base = pci_iomap(pdev, 1, 0);
189 if (chip->base == 0) {
190 dev_err(&pdev->dev, "%s : pci_iomap FAILED", __func__);
195 chip->reg = chip->base;
196 pci_set_drvdata(pdev, chip);
197 mutex_init(&chip->lock);
198 pch_gpio_setup(chip);
199 ret = gpiochip_add(&chip->gpio);
201 dev_err(&pdev->dev, "PCH gpio: Failed to register GPIO\n");
202 goto err_gpiochip_add;
208 pci_iounmap(pdev, chip->base);
211 pci_release_regions(pdev);
214 pci_disable_device(pdev);
218 dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret);
222 static void __devexit pch_gpio_remove(struct pci_dev *pdev)
225 struct pch_gpio *chip = pci_get_drvdata(pdev);
227 err = gpiochip_remove(&chip->gpio);
229 dev_err(&pdev->dev, "Failed gpiochip_remove\n");
231 pci_iounmap(pdev, chip->base);
232 pci_release_regions(pdev);
233 pci_disable_device(pdev);
238 static int pch_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
241 struct pch_gpio *chip = pci_get_drvdata(pdev);
243 pch_gpio_save_reg_conf(chip);
244 pch_gpio_restore_reg_conf(chip);
246 ret = pci_save_state(pdev);
248 dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret);
251 pci_disable_device(pdev);
252 pci_set_power_state(pdev, PCI_D0);
253 ret = pci_enable_wake(pdev, PCI_D0, 1);
255 dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret);
260 static int pch_gpio_resume(struct pci_dev *pdev)
263 struct pch_gpio *chip = pci_get_drvdata(pdev);
265 ret = pci_enable_wake(pdev, PCI_D0, 0);
267 pci_set_power_state(pdev, PCI_D0);
268 ret = pci_enable_device(pdev);
270 dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret);
273 pci_restore_state(pdev);
275 iowrite32(0x01, &chip->reg->reset);
276 iowrite32(0x00, &chip->reg->reset);
277 pch_gpio_restore_reg_conf(chip);
282 #define pch_gpio_suspend NULL
283 #define pch_gpio_resume NULL
286 #define PCI_VENDOR_ID_ROHM 0x10DB
287 static DEFINE_PCI_DEVICE_TABLE(pch_gpio_pcidev_id) = {
288 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8803) },
289 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8014) },
292 MODULE_DEVICE_TABLE(pci, pch_gpio_pcidev_id);
294 static struct pci_driver pch_gpio_driver = {
296 .id_table = pch_gpio_pcidev_id,
297 .probe = pch_gpio_probe,
298 .remove = __devexit_p(pch_gpio_remove),
299 .suspend = pch_gpio_suspend,
300 .resume = pch_gpio_resume
303 static int __init pch_gpio_pci_init(void)
305 return pci_register_driver(&pch_gpio_driver);
307 module_init(pch_gpio_pci_init);
309 static void __exit pch_gpio_pci_exit(void)
311 pci_unregister_driver(&pch_gpio_driver);
313 module_exit(pch_gpio_pci_exit);
315 MODULE_DESCRIPTION("PCH GPIO PCI Driver");
316 MODULE_LICENSE("GPL");