2 * GPIO interface for Intel Poulsbo SCH
4 * Copyright (c) 2010 CompuLab Ltd
5 * Author: Denis Turischev <denis@compulab.co.il>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License 2 as published
9 * by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; see the file COPYING. If not, write to
18 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
21 #include <linux/init.h>
22 #include <linux/kernel.h>
23 #include <linux/module.h>
25 #include <linux/errno.h>
26 #include <linux/acpi.h>
27 #include <linux/platform_device.h>
28 #include <linux/pci_ids.h>
30 #include <linux/gpio.h>
32 static DEFINE_SPINLOCK(gpio_lock);
42 static unsigned short gpio_ba;
44 static int sch_gpio_core_direction_in(struct gpio_chip *gc, unsigned gpio_num)
47 unsigned short offset, bit;
49 spin_lock(&gpio_lock);
51 offset = CGIO + gpio_num / 8;
54 curr_dirs = inb(gpio_ba + offset);
56 if (!(curr_dirs & (1 << bit)))
57 outb(curr_dirs | (1 << bit), gpio_ba + offset);
59 spin_unlock(&gpio_lock);
63 static int sch_gpio_core_get(struct gpio_chip *gc, unsigned gpio_num)
66 unsigned short offset, bit;
68 offset = CGLV + gpio_num / 8;
71 res = !!(inb(gpio_ba + offset) & (1 << bit));
75 static void sch_gpio_core_set(struct gpio_chip *gc, unsigned gpio_num, int val)
78 unsigned short offset, bit;
80 spin_lock(&gpio_lock);
82 offset = CGLV + gpio_num / 8;
85 curr_vals = inb(gpio_ba + offset);
88 outb(curr_vals | (1 << bit), gpio_ba + offset);
90 outb((curr_vals & ~(1 << bit)), gpio_ba + offset);
91 spin_unlock(&gpio_lock);
94 static int sch_gpio_core_direction_out(struct gpio_chip *gc,
95 unsigned gpio_num, int val)
98 unsigned short offset, bit;
100 sch_gpio_core_set(gc, gpio_num, val);
102 spin_lock(&gpio_lock);
104 offset = CGIO + gpio_num / 8;
107 curr_dirs = inb(gpio_ba + offset);
108 if (curr_dirs & (1 << bit))
109 outb(curr_dirs & ~(1 << bit), gpio_ba + offset);
111 spin_unlock(&gpio_lock);
115 static struct gpio_chip sch_gpio_core = {
116 .label = "sch_gpio_core",
117 .owner = THIS_MODULE,
118 .direction_input = sch_gpio_core_direction_in,
119 .get = sch_gpio_core_get,
120 .direction_output = sch_gpio_core_direction_out,
121 .set = sch_gpio_core_set,
124 static int sch_gpio_resume_direction_in(struct gpio_chip *gc,
129 spin_lock(&gpio_lock);
131 curr_dirs = inb(gpio_ba + RGIO);
133 if (!(curr_dirs & (1 << gpio_num)))
134 outb(curr_dirs | (1 << gpio_num) , gpio_ba + RGIO);
136 spin_unlock(&gpio_lock);
140 static int sch_gpio_resume_get(struct gpio_chip *gc, unsigned gpio_num)
142 return !!(inb(gpio_ba + RGLV) & (1 << gpio_num));
145 static void sch_gpio_resume_set(struct gpio_chip *gc,
146 unsigned gpio_num, int val)
150 spin_lock(&gpio_lock);
152 curr_vals = inb(gpio_ba + RGLV);
155 outb(curr_vals | (1 << gpio_num), gpio_ba + RGLV);
157 outb((curr_vals & ~(1 << gpio_num)), gpio_ba + RGLV);
159 spin_unlock(&gpio_lock);
162 static int sch_gpio_resume_direction_out(struct gpio_chip *gc,
163 unsigned gpio_num, int val)
167 sch_gpio_resume_set(gc, gpio_num, val);
169 spin_lock(&gpio_lock);
171 curr_dirs = inb(gpio_ba + RGIO);
172 if (curr_dirs & (1 << gpio_num))
173 outb(curr_dirs & ~(1 << gpio_num), gpio_ba + RGIO);
175 spin_unlock(&gpio_lock);
179 static struct gpio_chip sch_gpio_resume = {
180 .label = "sch_gpio_resume",
181 .owner = THIS_MODULE,
182 .direction_input = sch_gpio_resume_direction_in,
183 .get = sch_gpio_resume_get,
184 .direction_output = sch_gpio_resume_direction_out,
185 .set = sch_gpio_resume_set,
188 static int __devinit sch_gpio_probe(struct platform_device *pdev)
190 struct resource *res;
197 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
201 if (!request_region(res->start, resource_size(res), pdev->name))
204 gpio_ba = res->start;
207 case PCI_DEVICE_ID_INTEL_SCH_LPC:
208 sch_gpio_core.base = 0;
209 sch_gpio_core.ngpio = 10;
211 sch_gpio_resume.base = 10;
212 sch_gpio_resume.ngpio = 4;
215 * GPIO[6:0] enabled by default
216 * GPIO7 is configured by the CMC as SLPIOVR
217 * Enable GPIO[9:8] core powered gpios explicitly
219 outb(0x3, gpio_ba + CGEN + 1);
221 * SUS_GPIO[2:0] enabled by default
222 * Enable SUS_GPIO3 resume powered gpio explicitly
224 outb(0x8, gpio_ba + RGEN);
227 case PCI_DEVICE_ID_INTEL_ITC_LPC:
228 sch_gpio_core.base = 0;
229 sch_gpio_core.ngpio = 5;
231 sch_gpio_resume.base = 5;
232 sch_gpio_resume.ngpio = 9;
235 case PCI_DEVICE_ID_INTEL_CENTERTON_ILB:
236 sch_gpio_core.base = 0;
237 sch_gpio_core.ngpio = 21;
239 sch_gpio_resume.base = 21;
240 sch_gpio_resume.ngpio = 9;
247 sch_gpio_core.dev = &pdev->dev;
248 sch_gpio_resume.dev = &pdev->dev;
250 err = gpiochip_add(&sch_gpio_core);
252 goto err_sch_gpio_core;
254 err = gpiochip_add(&sch_gpio_resume);
256 goto err_sch_gpio_resume;
261 err = gpiochip_remove(&sch_gpio_core);
263 dev_err(&pdev->dev, "%s failed, %d\n",
264 "gpiochip_remove()", err);
267 release_region(res->start, resource_size(res));
273 static int __devexit sch_gpio_remove(struct platform_device *pdev)
275 struct resource *res;
279 err = gpiochip_remove(&sch_gpio_core);
281 dev_err(&pdev->dev, "%s failed, %d\n",
282 "gpiochip_remove()", err);
283 err = gpiochip_remove(&sch_gpio_resume);
285 dev_err(&pdev->dev, "%s failed, %d\n",
286 "gpiochip_remove()", err);
288 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
290 release_region(res->start, resource_size(res));
299 static struct platform_driver sch_gpio_driver = {
302 .owner = THIS_MODULE,
304 .probe = sch_gpio_probe,
305 .remove = __devexit_p(sch_gpio_remove),
308 module_platform_driver(sch_gpio_driver);
310 MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
311 MODULE_DESCRIPTION("GPIO interface for Intel Poulsbo SCH");
312 MODULE_LICENSE("GPL");
313 MODULE_ALIAS("platform:sch_gpio");