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Tomoya MORINAGA49a36792011-01-12 17:00:22 -08001/*
2 * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
3 *
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.
7 *
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.
12 *
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.
16 */
17#include <linux/kernel.h>
Andrew Morton545554e2011-05-24 17:13:43 -070018#include <linux/slab.h>
Tomoya MORINAGA49a36792011-01-12 17:00:22 -080019#include <linux/pci.h>
20#include <linux/gpio.h>
21
22#define PCI_VENDOR_ID_ROHM 0x10DB
23
24struct ioh_reg_comn {
25 u32 ien;
26 u32 istatus;
27 u32 idisp;
28 u32 iclr;
29 u32 imask;
30 u32 imaskclr;
31 u32 po;
32 u32 pi;
33 u32 pm;
34 u32 im_0;
35 u32 im_1;
36 u32 reserved;
37};
38
39struct ioh_regs {
40 struct ioh_reg_comn regs[8];
41 u32 reserve1[16];
42 u32 ioh_sel_reg[4];
43 u32 reserve2[11];
44 u32 srst;
45};
46
47/**
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.
51 */
52struct ioh_gpio_reg_data {
53 u32 po_reg;
54 u32 pm_reg;
55};
56
57/**
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
64 * when suspend.
65 * @ch: Indicate GPIO channel
66 */
67struct ioh_gpio {
68 void __iomem *base;
69 struct ioh_regs __iomem *reg;
70 struct device *dev;
71 struct gpio_chip gpio;
72 struct ioh_gpio_reg_data ioh_gpio_reg;
73 struct mutex lock;
74 int ch;
75};
76
77static const int num_ports[] = {6, 12, 16, 16, 15, 16, 16, 12};
78
79static void ioh_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
80{
81 u32 reg_val;
82 struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
83
84 mutex_lock(&chip->lock);
85 reg_val = ioread32(&chip->reg->regs[chip->ch].po);
86 if (val)
87 reg_val |= (1 << nr);
88 else
89 reg_val &= ~(1 << nr);
90
91 iowrite32(reg_val, &chip->reg->regs[chip->ch].po);
92 mutex_unlock(&chip->lock);
93}
94
95static int ioh_gpio_get(struct gpio_chip *gpio, unsigned nr)
96{
97 struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
98
99 return ioread32(&chip->reg->regs[chip->ch].pi) & (1 << nr);
100}
101
102static int ioh_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
103 int val)
104{
105 struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
106 u32 pm;
107 u32 reg_val;
108
109 mutex_lock(&chip->lock);
110 pm = ioread32(&chip->reg->regs[chip->ch].pm) &
111 ((1 << num_ports[chip->ch]) - 1);
112 pm |= (1 << nr);
113 iowrite32(pm, &chip->reg->regs[chip->ch].pm);
114
115 reg_val = ioread32(&chip->reg->regs[chip->ch].po);
116 if (val)
117 reg_val |= (1 << nr);
118 else
119 reg_val &= ~(1 << nr);
Peter Tyserba438612011-03-24 18:17:14 -0500120 iowrite32(reg_val, &chip->reg->regs[chip->ch].po);
Tomoya MORINAGA49a36792011-01-12 17:00:22 -0800121
122 mutex_unlock(&chip->lock);
123
124 return 0;
125}
126
127static int ioh_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
128{
129 struct ioh_gpio *chip = container_of(gpio, struct ioh_gpio, gpio);
130 u32 pm;
131
132 mutex_lock(&chip->lock);
133 pm = ioread32(&chip->reg->regs[chip->ch].pm) &
134 ((1 << num_ports[chip->ch]) - 1);
135 pm &= ~(1 << nr);
136 iowrite32(pm, &chip->reg->regs[chip->ch].pm);
137 mutex_unlock(&chip->lock);
138
139 return 0;
140}
141
Andrew Morton545554e2011-05-24 17:13:43 -0700142#ifdef CONFIG_PM
Tomoya MORINAGA49a36792011-01-12 17:00:22 -0800143/*
144 * Save register configuration and disable interrupts.
145 */
146static void ioh_gpio_save_reg_conf(struct ioh_gpio *chip)
147{
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);
150}
151
152/*
153 * This function restores the register configuration of the GPIO device.
154 */
155static void ioh_gpio_restore_reg_conf(struct ioh_gpio *chip)
156{
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);
161}
Andrew Morton545554e2011-05-24 17:13:43 -0700162#endif
Tomoya MORINAGA49a36792011-01-12 17:00:22 -0800163
164static void ioh_gpio_setup(struct ioh_gpio *chip, int num_port)
165{
166 struct gpio_chip *gpio = &chip->gpio;
167
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;
175 gpio->base = -1;
176 gpio->ngpio = num_port;
177 gpio->can_sleep = 0;
178}
179
180static int __devinit ioh_gpio_probe(struct pci_dev *pdev,
181 const struct pci_device_id *id)
182{
183 int ret;
184 int i;
185 struct ioh_gpio *chip;
186 void __iomem *base;
187 void __iomem *chip_save;
188
189 ret = pci_enable_device(pdev);
190 if (ret) {
191 dev_err(&pdev->dev, "%s : pci_enable_device failed", __func__);
192 goto err_pci_enable;
193 }
194
195 ret = pci_request_regions(pdev, KBUILD_MODNAME);
196 if (ret) {
197 dev_err(&pdev->dev, "pci_request_regions failed-%d", ret);
198 goto err_request_regions;
199 }
200
201 base = pci_iomap(pdev, 1, 0);
202 if (base == 0) {
203 dev_err(&pdev->dev, "%s : pci_iomap failed", __func__);
204 ret = -ENOMEM;
205 goto err_iomap;
206 }
207
208 chip_save = kzalloc(sizeof(*chip) * 8, GFP_KERNEL);
209 if (chip_save == NULL) {
210 dev_err(&pdev->dev, "%s : kzalloc failed", __func__);
211 ret = -ENOMEM;
212 goto err_kzalloc;
213 }
214
215 chip = chip_save;
216 for (i = 0; i < 8; i++, chip++) {
217 chip->dev = &pdev->dev;
218 chip->base = base;
219 chip->reg = chip->base;
220 chip->ch = i;
221 mutex_init(&chip->lock);
222 ioh_gpio_setup(chip, num_ports[i]);
223 ret = gpiochip_add(&chip->gpio);
224 if (ret) {
225 dev_err(&pdev->dev, "IOH gpio: Failed to register GPIO\n");
226 goto err_gpiochip_add;
227 }
228 }
229
230 chip = chip_save;
231 pci_set_drvdata(pdev, chip);
232
233 return 0;
234
235err_gpiochip_add:
Axel Lin33300572011-06-14 19:12:57 +0800236 while (--i >= 0) {
Tomoya MORINAGA49a36792011-01-12 17:00:22 -0800237 chip--;
238 ret = gpiochip_remove(&chip->gpio);
239 if (ret)
240 dev_err(&pdev->dev, "Failed gpiochip_remove(%d)\n", i);
241 }
242 kfree(chip_save);
243
244err_kzalloc:
245 pci_iounmap(pdev, base);
246
247err_iomap:
248 pci_release_regions(pdev);
249
250err_request_regions:
251 pci_disable_device(pdev);
252
253err_pci_enable:
254
255 dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret);
256 return ret;
257}
258
259static void __devexit ioh_gpio_remove(struct pci_dev *pdev)
260{
261 int err;
262 int i;
263 struct ioh_gpio *chip = pci_get_drvdata(pdev);
264 void __iomem *chip_save;
265
266 chip_save = chip;
267 for (i = 0; i < 8; i++, chip++) {
268 err = gpiochip_remove(&chip->gpio);
269 if (err)
270 dev_err(&pdev->dev, "Failed gpiochip_remove\n");
271 }
272
273 chip = chip_save;
274 pci_iounmap(pdev, chip->base);
275 pci_release_regions(pdev);
276 pci_disable_device(pdev);
277 kfree(chip);
278}
279
280#ifdef CONFIG_PM
281static int ioh_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
282{
283 s32 ret;
284 struct ioh_gpio *chip = pci_get_drvdata(pdev);
285
286 ioh_gpio_save_reg_conf(chip);
287 ioh_gpio_restore_reg_conf(chip);
288
289 ret = pci_save_state(pdev);
290 if (ret) {
291 dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret);
292 return ret;
293 }
294 pci_disable_device(pdev);
295 pci_set_power_state(pdev, PCI_D0);
296 ret = pci_enable_wake(pdev, PCI_D0, 1);
297 if (ret)
298 dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret);
299
300 return 0;
301}
302
303static int ioh_gpio_resume(struct pci_dev *pdev)
304{
305 s32 ret;
306 struct ioh_gpio *chip = pci_get_drvdata(pdev);
307
308 ret = pci_enable_wake(pdev, PCI_D0, 0);
309
310 pci_set_power_state(pdev, PCI_D0);
311 ret = pci_enable_device(pdev);
312 if (ret) {
313 dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret);
314 return ret;
315 }
316 pci_restore_state(pdev);
317
318 iowrite32(0x01, &chip->reg->srst);
319 iowrite32(0x00, &chip->reg->srst);
320 ioh_gpio_restore_reg_conf(chip);
321
322 return 0;
323}
324#else
325#define ioh_gpio_suspend NULL
326#define ioh_gpio_resume NULL
327#endif
328
329static DEFINE_PCI_DEVICE_TABLE(ioh_gpio_pcidev_id) = {
330 { PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x802E) },
331 { 0, }
332};
Axel Lin19234cd2011-03-11 14:58:30 -0800333MODULE_DEVICE_TABLE(pci, ioh_gpio_pcidev_id);
Tomoya MORINAGA49a36792011-01-12 17:00:22 -0800334
335static 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
342};
343
344static int __init ioh_gpio_pci_init(void)
345{
346 return pci_register_driver(&ioh_gpio_driver);
347}
348module_init(ioh_gpio_pci_init);
349
350static void __exit ioh_gpio_pci_exit(void)
351{
352 pci_unregister_driver(&ioh_gpio_driver);
353}
354module_exit(ioh_gpio_pci_exit);
355
356MODULE_DESCRIPTION("OKI SEMICONDUCTOR ML-IOH series GPIO Driver");
357MODULE_LICENSE("GPL");