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/slab.h>
19 #include <linux/pci.h>
20 #include <linux/gpio.h>
22 #define PCI_VENDOR_ID_ROHM 0x10DB
40 struct ioh_reg_comn regs[8];
48 * struct ioh_gpio_reg_data - The register store data.
49 * @po_reg: To store contents of PO register.
50 * @pm_reg: To store contents of PM register.
52 struct ioh_gpio_reg_data {
58 * struct ioh_gpio - GPIO private data structure.
59 * @base: PCI base address of Memory mapped I/O register.
60 * @reg: Memory mapped IOH GPIO register list.
61 * @dev: Pointer to device structure.
62 * @gpio: Data for GPIO infrastructure.
63 * @ioh_gpio_reg: Memory mapped Register data is saved here
65 * @ch: Indicate GPIO channel
69 struct ioh_regs __iomem *reg;
71 struct gpio_chip gpio;
72 struct ioh_gpio_reg_data ioh_gpio_reg;
77 static const int num_ports[] = {6, 12, 16, 16, 15, 16, 16, 12};
79 static void ioh_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
82 struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
84 mutex_lock(&chip->lock);
85 reg_val = ioread32(&chip->reg->regs[chip->ch].po);
89 reg_val &= ~(1 << nr);
91 iowrite32(reg_val, &chip->reg->regs[chip->ch].po);
92 mutex_unlock(&chip->lock);
95 static int ioh_gpio_get(struct gpio_chip *gpio, unsigned nr)
97 struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
99 return ioread32(&chip->reg->regs[chip->ch].pi) & (1 << nr);
102 static int ioh_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
105 struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
109 mutex_lock(&chip->lock);
110 pm = ioread32(&chip->reg->regs[chip->ch].pm) &
111 ((1 << num_ports[chip->ch]) - 1);
113 iowrite32(pm, &chip->reg->regs[chip->ch].pm);
115 reg_val = ioread32(&chip->reg->regs[chip->ch].po);
117 reg_val |= (1 << nr);
119 reg_val &= ~(1 << nr);
120 iowrite32(reg_val, &chip->reg->regs[chip->ch].po);
122 mutex_unlock(&chip->lock);
127 static int ioh_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
129 struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
132 mutex_lock(&chip->lock);
133 pm = ioread32(&chip->reg->regs[chip->ch].pm) &
134 ((1 << num_ports[chip->ch]) - 1);
136 iowrite32(pm, &chip->reg->regs[chip->ch].pm);
137 mutex_unlock(&chip->lock);
144 * Save register configuration and disable interrupts.
146 static void ioh_gpio_save_reg_conf(struct ioh_gpio *chip)
148 chip->ioh_gpio_reg.po_reg = ioread32(&chip->reg->regs[chip->ch].po);
149 chip->ioh_gpio_reg.pm_reg = ioread32(&chip->reg->regs[chip->ch].pm);
153 * This function restores the register configuration of the GPIO device.
155 static void ioh_gpio_restore_reg_conf(struct ioh_gpio *chip)
157 /* to store contents of PO register */
158 iowrite32(chip->ioh_gpio_reg.po_reg, &chip->reg->regs[chip->ch].po);
159 /* to store contents of PM register */
160 iowrite32(chip->ioh_gpio_reg.pm_reg, &chip->reg->regs[chip->ch].pm);
164 static void ioh_gpio_setup(struct ioh_gpio *chip, int num_port)
166 struct gpio_chip *gpio = &chip->gpio;
168 gpio->label = dev_name(chip->dev);
169 gpio->owner = THIS_MODULE;
170 gpio->direction_input = ioh_gpio_direction_input;
171 gpio->get = ioh_gpio_get;
172 gpio->direction_output = ioh_gpio_direction_output;
173 gpio->set = ioh_gpio_set;
174 gpio->dbg_show = NULL;
176 gpio->ngpio = num_port;
180 static int __devinit ioh_gpio_probe(struct pci_dev *pdev,
181 const struct pci_device_id *id)
185 struct ioh_gpio *chip;
187 void __iomem *chip_save;
189 ret = pci_enable_device(pdev);
191 dev_err(&pdev->dev, "%s : pci_enable_device failed", __func__);
195 ret = pci_request_regions(pdev, KBUILD_MODNAME);
197 dev_err(&pdev->dev, "pci_request_regions failed-%d", ret);
198 goto err_request_regions;
201 base = pci_iomap(pdev, 1, 0);
203 dev_err(&pdev->dev, "%s : pci_iomap failed", __func__);
208 chip_save = kzalloc(sizeof(*chip) * 8, GFP_KERNEL);
209 if (chip_save == NULL) {
210 dev_err(&pdev->dev, "%s : kzalloc failed", __func__);
216 for (i = 0; i < 8; i++, chip++) {
217 chip->dev = &pdev->dev;
219 chip->reg = chip->base;
221 mutex_init(&chip->lock);
222 ioh_gpio_setup(chip, num_ports[i]);
223 ret = gpiochip_add(&chip->gpio);
225 dev_err(&pdev->dev, "IOH gpio: Failed to register GPIO\n");
226 goto err_gpiochip_add;
231 pci_set_drvdata(pdev, chip);
236 for (; i != 0; i--) {
238 ret = gpiochip_remove(&chip->gpio);
240 dev_err(&pdev->dev, "Failed gpiochip_remove(%d)\n", i);
245 pci_iounmap(pdev, base);
248 pci_release_regions(pdev);
251 pci_disable_device(pdev);
255 dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret);
259 static void __devexit ioh_gpio_remove(struct pci_dev *pdev)
263 struct ioh_gpio *chip = pci_get_drvdata(pdev);
264 void __iomem *chip_save;
267 for (i = 0; i < 8; i++, chip++) {
268 err = gpiochip_remove(&chip->gpio);
270 dev_err(&pdev->dev, "Failed gpiochip_remove\n");
274 pci_iounmap(pdev, chip->base);
275 pci_release_regions(pdev);
276 pci_disable_device(pdev);
281 static int ioh_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
284 struct ioh_gpio *chip = pci_get_drvdata(pdev);
286 ioh_gpio_save_reg_conf(chip);
287 ioh_gpio_restore_reg_conf(chip);
289 ret = pci_save_state(pdev);
291 dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret);
294 pci_disable_device(pdev);
295 pci_set_power_state(pdev, PCI_D0);
296 ret = pci_enable_wake(pdev, PCI_D0, 1);
298 dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret);
303 static int ioh_gpio_resume(struct pci_dev *pdev)
306 struct ioh_gpio *chip = pci_get_drvdata(pdev);
308 ret = pci_enable_wake(pdev, PCI_D0, 0);
310 pci_set_power_state(pdev, PCI_D0);
311 ret = pci_enable_device(pdev);
313 dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret);
316 pci_restore_state(pdev);
318 iowrite32(0x01, &chip->reg->srst);
319 iowrite32(0x00, &chip->reg->srst);
320 ioh_gpio_restore_reg_conf(chip);
325 #define ioh_gpio_suspend NULL
326 #define ioh_gpio_resume NULL
329 static DEFINE_PCI_DEVICE_TABLE(ioh_gpio_pcidev_id) = {
330 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x802E) },
333 MODULE_DEVICE_TABLE(pci, ioh_gpio_pcidev_id);
335 static struct pci_driver ioh_gpio_driver = {
336 .name = "ml_ioh_gpio",
337 .id_table = ioh_gpio_pcidev_id,
338 .probe = ioh_gpio_probe,
339 .remove = __devexit_p(ioh_gpio_remove),
340 .suspend = ioh_gpio_suspend,
341 .resume = ioh_gpio_resume
344 static int __init ioh_gpio_pci_init(void)
346 return pci_register_driver(&ioh_gpio_driver);
348 module_init(ioh_gpio_pci_init);
350 static void __exit ioh_gpio_pci_exit(void)
352 pci_unregister_driver(&ioh_gpio_driver);
354 module_exit(ioh_gpio_pci_exit);
356 MODULE_DESCRIPTION("OKI SEMICONDUCTOR ML-IOH series GPIO Driver");
357 MODULE_LICENSE("GPL");