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);
109 mutex_unlock(&chip->lock);
114 static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
116 struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
119 mutex_lock(&chip->lock);
120 pm = ioread32(&chip->reg->pm) & PCH_GPIO_ALL_PINS; /*bits 0-11*/
122 iowrite32(pm, &chip->reg->pm);
123 mutex_unlock(&chip->lock);
129 * Save register configuration and disable interrupts.
131 static void pch_gpio_save_reg_conf(struct pch_gpio *chip)
133 chip->pch_gpio_reg.po_reg = ioread32(&chip->reg->po);
134 chip->pch_gpio_reg.pm_reg = ioread32(&chip->reg->pm);
138 * This function restores the register configuration of the GPIO device.
140 static void pch_gpio_restore_reg_conf(struct pch_gpio *chip)
142 /* to store contents of PO register */
143 iowrite32(chip->pch_gpio_reg.po_reg, &chip->reg->po);
144 /* to store contents of PM register */
145 iowrite32(chip->pch_gpio_reg.pm_reg, &chip->reg->pm);
148 static void pch_gpio_setup(struct pch_gpio *chip)
150 struct gpio_chip *gpio = &chip->gpio;
152 gpio->label = dev_name(chip->dev);
153 gpio->owner = THIS_MODULE;
154 gpio->direction_input = pch_gpio_direction_input;
155 gpio->get = pch_gpio_get;
156 gpio->direction_output = pch_gpio_direction_output;
157 gpio->set = pch_gpio_set;
158 gpio->dbg_show = NULL;
160 gpio->ngpio = GPIO_NUM_PINS;
164 static int __devinit pch_gpio_probe(struct pci_dev *pdev,
165 const struct pci_device_id *id)
168 struct pch_gpio *chip;
170 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
174 chip->dev = &pdev->dev;
175 ret = pci_enable_device(pdev);
177 dev_err(&pdev->dev, "%s : pci_enable_device FAILED", __func__);
181 ret = pci_request_regions(pdev, KBUILD_MODNAME);
183 dev_err(&pdev->dev, "pci_request_regions FAILED-%d", ret);
184 goto err_request_regions;
187 chip->base = pci_iomap(pdev, 1, 0);
188 if (chip->base == 0) {
189 dev_err(&pdev->dev, "%s : pci_iomap FAILED", __func__);
194 chip->reg = chip->base;
195 pci_set_drvdata(pdev, chip);
196 mutex_init(&chip->lock);
197 pch_gpio_setup(chip);
198 ret = gpiochip_add(&chip->gpio);
200 dev_err(&pdev->dev, "PCH gpio: Failed to register GPIO\n");
201 goto err_gpiochip_add;
207 pci_iounmap(pdev, chip->base);
210 pci_release_regions(pdev);
213 pci_disable_device(pdev);
217 dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret);
221 static void __devexit pch_gpio_remove(struct pci_dev *pdev)
224 struct pch_gpio *chip = pci_get_drvdata(pdev);
226 err = gpiochip_remove(&chip->gpio);
228 dev_err(&pdev->dev, "Failed gpiochip_remove\n");
230 pci_iounmap(pdev, chip->base);
231 pci_release_regions(pdev);
232 pci_disable_device(pdev);
237 static int pch_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
240 struct pch_gpio *chip = pci_get_drvdata(pdev);
242 pch_gpio_save_reg_conf(chip);
243 pch_gpio_restore_reg_conf(chip);
245 ret = pci_save_state(pdev);
247 dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret);
250 pci_disable_device(pdev);
251 pci_set_power_state(pdev, PCI_D0);
252 ret = pci_enable_wake(pdev, PCI_D0, 1);
254 dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret);
259 static int pch_gpio_resume(struct pci_dev *pdev)
262 struct pch_gpio *chip = pci_get_drvdata(pdev);
264 ret = pci_enable_wake(pdev, PCI_D0, 0);
266 pci_set_power_state(pdev, PCI_D0);
267 ret = pci_enable_device(pdev);
269 dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret);
272 pci_restore_state(pdev);
274 iowrite32(0x01, &chip->reg->reset);
275 iowrite32(0x00, &chip->reg->reset);
276 pch_gpio_restore_reg_conf(chip);
281 #define pch_gpio_suspend NULL
282 #define pch_gpio_resume NULL
285 static DEFINE_PCI_DEVICE_TABLE(pch_gpio_pcidev_id) = {
286 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8803) },
290 static struct pci_driver pch_gpio_driver = {
292 .id_table = pch_gpio_pcidev_id,
293 .probe = pch_gpio_probe,
294 .remove = __devexit_p(pch_gpio_remove),
295 .suspend = pch_gpio_suspend,
296 .resume = pch_gpio_resume
299 static int __init pch_gpio_pci_init(void)
301 return pci_register_driver(&pch_gpio_driver);
303 module_init(pch_gpio_pci_init);
305 static void __exit pch_gpio_pci_exit(void)
307 pci_unregister_driver(&pch_gpio_driver);
309 module_exit(pch_gpio_pci_exit);
311 MODULE_DESCRIPTION("PCH GPIO PCI Driver");
312 MODULE_LICENSE("GPL");