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1/*
2 * Intel ICH6-10, Series 5 and 6 GPIO driver
3 *
4 * Copyright (C) 2010 Extreme Engineering Solutions.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
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.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23#include <linux/module.h>
24#include <linux/pci.h>
25#include <linux/gpio.h>
26#include <linux/platform_device.h>
27#include <linux/mfd/lpc_ich.h>
28
29#define DRV_NAME "gpio_ich"
30
31/*
32 * GPIO register offsets in GPIO I/O space.
33 * Each chunk of 32 GPIOs is manipulated via its own USE_SELx, IO_SELx, and
34 * LVLx registers. Logic in the read/write functions takes a register and
35 * an absolute bit number and determines the proper register offset and bit
36 * number in that register. For example, to read the value of GPIO bit 50
37 * the code would access offset ichx_regs[2(=GPIO_LVL)][1(=50/32)],
38 * bit 18 (50%32).
39 */
40enum GPIO_REG {
41 GPIO_USE_SEL = 0,
42 GPIO_IO_SEL,
43 GPIO_LVL,
44};
45
46static const u8 ichx_regs[3][3] = {
47 {0x00, 0x30, 0x40}, /* USE_SEL[1-3] offsets */
48 {0x04, 0x34, 0x44}, /* IO_SEL[1-3] offsets */
49 {0x0c, 0x38, 0x48}, /* LVL[1-3] offsets */
50};
51
52#define ICHX_WRITE(val, reg, base_res) outl(val, (reg) + (base_res)->start)
53#define ICHX_READ(reg, base_res) inl((reg) + (base_res)->start)
54
55struct ichx_desc {
56 /* Max GPIO pins the chipset can have */
57 uint ngpio;
58
59 /* Whether the chipset has GPIO in GPE0_STS in the PM IO region */
60 bool uses_gpe0;
61
62 /* USE_SEL is bogus on some chipsets, eg 3100 */
63 u32 use_sel_ignore[3];
64
65 /* Some chipsets have quirks, let these use their own request/get */
66 int (*request)(struct gpio_chip *chip, unsigned offset);
67 int (*get)(struct gpio_chip *chip, unsigned offset);
68};
69
70static struct {
71 spinlock_t lock;
72 struct platform_device *dev;
73 struct gpio_chip chip;
74 struct resource *gpio_base; /* GPIO IO base */
75 struct resource *pm_base; /* Power Mangagment IO base */
76 struct ichx_desc *desc; /* Pointer to chipset-specific description */
77 u32 orig_gpio_ctrl; /* Orig CTRL value, used to restore on exit */
78} ichx_priv;
79
80static int modparam_gpiobase = -1; /* dynamic */
81module_param_named(gpiobase, modparam_gpiobase, int, 0444);
82MODULE_PARM_DESC(gpiobase, "The GPIO number base. -1 means dynamic, "
83 "which is the default.");
84
85static int ichx_write_bit(int reg, unsigned nr, int val, int verify)
86{
87 unsigned long flags;
88 u32 data, tmp;
89 int reg_nr = nr / 32;
90 int bit = nr & 0x1f;
91 int ret = 0;
92
93 spin_lock_irqsave(&ichx_priv.lock, flags);
94
95 data = ICHX_READ(ichx_regs[reg][reg_nr], ichx_priv.gpio_base);
96 if (val)
97 data |= 1 << bit;
98 else
99 data &= ~(1 << bit);
100 ICHX_WRITE(data, ichx_regs[reg][reg_nr], ichx_priv.gpio_base);
101 tmp = ICHX_READ(ichx_regs[reg][reg_nr], ichx_priv.gpio_base);
102 if (verify && data != tmp)
103 ret = -EPERM;
104
105 spin_unlock_irqrestore(&ichx_priv.lock, flags);
106
107 return ret;
108}
109
110static int ichx_read_bit(int reg, unsigned nr)
111{
112 unsigned long flags;
113 u32 data;
114 int reg_nr = nr / 32;
115 int bit = nr & 0x1f;
116
117 spin_lock_irqsave(&ichx_priv.lock, flags);
118
119 data = ICHX_READ(ichx_regs[reg][reg_nr], ichx_priv.gpio_base);
120
121 spin_unlock_irqrestore(&ichx_priv.lock, flags);
122
123 return data & (1 << bit) ? 1 : 0;
124}
125
126static int ichx_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
127{
128 /*
129 * Try setting pin as an input and verify it worked since many pins
130 * are output-only.
131 */
132 if (ichx_write_bit(GPIO_IO_SEL, nr, 1, 1))
133 return -EINVAL;
134
135 return 0;
136}
137
138static int ichx_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
139 int val)
140{
141 /* Set GPIO output value. */
142 ichx_write_bit(GPIO_LVL, nr, val, 0);
143
144 /*
145 * Try setting pin as an output and verify it worked since many pins
146 * are input-only.
147 */
148 if (ichx_write_bit(GPIO_IO_SEL, nr, 0, 1))
149 return -EINVAL;
150
151 return 0;
152}
153
154static int ichx_gpio_get(struct gpio_chip *chip, unsigned nr)
155{
156 return ichx_read_bit(GPIO_LVL, nr);
157}
158
159static int ich6_gpio_get(struct gpio_chip *chip, unsigned nr)
160{
161 unsigned long flags;
162 u32 data;
163
164 /*
165 * GPI 0 - 15 need to be read from the power management registers on
166 * a ICH6/3100 bridge.
167 */
168 if (nr < 16) {
169 if (!ichx_priv.pm_base)
170 return -ENXIO;
171
172 spin_lock_irqsave(&ichx_priv.lock, flags);
173
174 /* GPI 0 - 15 are latched, write 1 to clear*/
175 ICHX_WRITE(1 << (16 + nr), 0, ichx_priv.pm_base);
176 data = ICHX_READ(0, ichx_priv.pm_base);
177
178 spin_unlock_irqrestore(&ichx_priv.lock, flags);
179
180 return (data >> 16) & (1 << nr) ? 1 : 0;
181 } else {
182 return ichx_gpio_get(chip, nr);
183 }
184}
185
186static int ichx_gpio_request(struct gpio_chip *chip, unsigned nr)
187{
188 /*
189 * Note we assume the BIOS properly set a bridge's USE value. Some
190 * chips (eg Intel 3100) have bogus USE values though, so first see if
191 * the chipset's USE value can be trusted for this specific bit.
192 * If it can't be trusted, assume that the pin can be used as a GPIO.
193 */
194 if (ichx_priv.desc->use_sel_ignore[nr / 32] & (1 << (nr & 0x1f)))
195 return 1;
196
197 return ichx_read_bit(GPIO_USE_SEL, nr) ? 0 : -ENODEV;
198}
199
200static int ich6_gpio_request(struct gpio_chip *chip, unsigned nr)
201{
202 /*
203 * Fixups for bits 16 and 17 are necessary on the Intel ICH6/3100
204 * bridge as they are controlled by USE register bits 0 and 1. See
205 * "Table 704 GPIO_USE_SEL1 register" in the i3100 datasheet for
206 * additional info.
207 */
208 if (nr == 16 || nr == 17)
209 nr -= 16;
210
211 return ichx_gpio_request(chip, nr);
212}
213
214static void ichx_gpio_set(struct gpio_chip *chip, unsigned nr, int val)
215{
216 ichx_write_bit(GPIO_LVL, nr, val, 0);
217}
218
219static void __devinit ichx_gpiolib_setup(struct gpio_chip *chip)
220{
221 chip->owner = THIS_MODULE;
222 chip->label = DRV_NAME;
223 chip->dev = &ichx_priv.dev->dev;
224
225 /* Allow chip-specific overrides of request()/get() */
226 chip->request = ichx_priv.desc->request ?
227 ichx_priv.desc->request : ichx_gpio_request;
228 chip->get = ichx_priv.desc->get ?
229 ichx_priv.desc->get : ichx_gpio_get;
230
231 chip->set = ichx_gpio_set;
232 chip->direction_input = ichx_gpio_direction_input;
233 chip->direction_output = ichx_gpio_direction_output;
234 chip->base = modparam_gpiobase;
235 chip->ngpio = ichx_priv.desc->ngpio;
236 chip->can_sleep = 0;
237 chip->dbg_show = NULL;
238}
239
240/* ICH6-based, 631xesb-based */
241static struct ichx_desc ich6_desc = {
242 /* Bridges using the ICH6 controller need fixups for GPIO 0 - 17 */
243 .request = ich6_gpio_request,
244 .get = ich6_gpio_get,
245
246 /* GPIO 0-15 are read in the GPE0_STS PM register */
247 .uses_gpe0 = true,
248
249 .ngpio = 50,
250};
251
252/* Intel 3100 */
253static struct ichx_desc i3100_desc = {
254 /*
255 * Bits 16,17, 20 of USE_SEL and bit 16 of USE_SEL2 always read 0 on
256 * the Intel 3100. See "Table 712. GPIO Summary Table" of 3100
257 * Datasheet for more info.
258 */
259 .use_sel_ignore = {0x00130000, 0x00010000, 0x0},
260
261 /* The 3100 needs fixups for GPIO 0 - 17 */
262 .request = ich6_gpio_request,
263 .get = ich6_gpio_get,
264
265 /* GPIO 0-15 are read in the GPE0_STS PM register */
266 .uses_gpe0 = true,
267
268 .ngpio = 50,
269};
270
271/* ICH7 and ICH8-based */
272static struct ichx_desc ich7_desc = {
273 .ngpio = 50,
274};
275
276/* ICH9-based */
277static struct ichx_desc ich9_desc = {
278 .ngpio = 61,
279};
280
281/* ICH10-based - Consumer/corporate versions have different amount of GPIO */
282static struct ichx_desc ich10_cons_desc = {
283 .ngpio = 61,
284};
285static struct ichx_desc ich10_corp_desc = {
286 .ngpio = 72,
287};
288
289/* Intel 5 series, 6 series, 3400 series, and C200 series */
290static struct ichx_desc intel5_desc = {
291 .ngpio = 76,
292};
293
294static int __devinit ichx_gpio_probe(struct platform_device *pdev)
295{
296 struct resource *res_base, *res_pm;
297 int err;
298 struct lpc_ich_info *ich_info = pdev->dev.platform_data;
299
300 if (!ich_info)
301 return -ENODEV;
302
303 ichx_priv.dev = pdev;
304
305 switch (ich_info->gpio_version) {
306 case ICH_I3100_GPIO:
307 ichx_priv.desc = &i3100_desc;
308 break;
309 case ICH_V5_GPIO:
310 ichx_priv.desc = &intel5_desc;
311 break;
312 case ICH_V6_GPIO:
313 ichx_priv.desc = &ich6_desc;
314 break;
315 case ICH_V7_GPIO:
316 ichx_priv.desc = &ich7_desc;
317 break;
318 case ICH_V9_GPIO:
319 ichx_priv.desc = &ich9_desc;
320 break;
321 case ICH_V10CORP_GPIO:
322 ichx_priv.desc = &ich10_corp_desc;
323 break;
324 case ICH_V10CONS_GPIO:
325 ichx_priv.desc = &ich10_cons_desc;
326 break;
327 default:
328 return -ENODEV;
329 }
330
331 res_base = platform_get_resource(pdev, IORESOURCE_IO, ICH_RES_GPIO);
332 if (!res_base || !res_base->start || !res_base->end)
333 return -ENODEV;
334
335 if (!request_region(res_base->start, resource_size(res_base),
336 pdev->name))
337 return -EBUSY;
338
339 ichx_priv.gpio_base = res_base;
340
341 /*
342 * If necessary, determine the I/O address of ACPI/power management
343 * registers which are needed to read the the GPE0 register for GPI pins
344 * 0 - 15 on some chipsets.
345 */
346 if (!ichx_priv.desc->uses_gpe0)
347 goto init;
348
349 res_pm = platform_get_resource(pdev, IORESOURCE_IO, ICH_RES_GPE0);
350 if (!res_pm) {
351 pr_warn("ACPI BAR is unavailable, GPI 0 - 15 unavailable\n");
352 goto init;
353 }
354
355 if (!request_region(res_pm->start, resource_size(res_pm),
356 pdev->name)) {
357 pr_warn("ACPI BAR is busy, GPI 0 - 15 unavailable\n");
358 goto init;
359 }
360
361 ichx_priv.pm_base = res_pm;
362
363init:
364 ichx_gpiolib_setup(&ichx_priv.chip);
365 err = gpiochip_add(&ichx_priv.chip);
366 if (err) {
367 pr_err("Failed to register GPIOs\n");
368 goto add_err;
369 }
370
371 pr_info("GPIO from %d to %d on %s\n", ichx_priv.chip.base,
372 ichx_priv.chip.base + ichx_priv.chip.ngpio - 1, DRV_NAME);
373
374 return 0;
375
376add_err:
377 release_region(ichx_priv.gpio_base->start,
378 resource_size(ichx_priv.gpio_base));
379 if (ichx_priv.pm_base)
380 release_region(ichx_priv.pm_base->start,
381 resource_size(ichx_priv.pm_base));
382 return err;
383}
384
385static int __devexit ichx_gpio_remove(struct platform_device *pdev)
386{
387 int err;
388
389 err = gpiochip_remove(&ichx_priv.chip);
390 if (err) {
391 dev_err(&pdev->dev, "%s failed, %d\n",
392 "gpiochip_remove()", err);
393 return err;
394 }
395
396 release_region(ichx_priv.gpio_base->start,
397 resource_size(ichx_priv.gpio_base));
398 if (ichx_priv.pm_base)
399 release_region(ichx_priv.pm_base->start,
400 resource_size(ichx_priv.pm_base));
401
402 return 0;
403}
404
405static struct platform_driver ichx_gpio_driver = {
406 .driver = {
407 .owner = THIS_MODULE,
408 .name = DRV_NAME,
409 },
410 .probe = ichx_gpio_probe,
411 .remove = __devexit_p(ichx_gpio_remove),
412};
413
414module_platform_driver(ichx_gpio_driver);
415
416MODULE_AUTHOR("Peter Tyser <ptyser@xes-inc.com>");
417MODULE_DESCRIPTION("GPIO interface for Intel ICH series");
418MODULE_LICENSE("GPL");
419MODULE_ALIAS("platform:"DRV_NAME);
1/*
2 * Intel ICH6-10, Series 5 and 6, Atom C2000 (Avoton/Rangeley) GPIO driver
3 *
4 * Copyright (C) 2010 Extreme Engineering Solutions.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
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.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23#include <linux/ioport.h>
24#include <linux/module.h>
25#include <linux/pci.h>
26#include <linux/gpio.h>
27#include <linux/platform_device.h>
28#include <linux/mfd/lpc_ich.h>
29
30#define DRV_NAME "gpio_ich"
31
32/*
33 * GPIO register offsets in GPIO I/O space.
34 * Each chunk of 32 GPIOs is manipulated via its own USE_SELx, IO_SELx, and
35 * LVLx registers. Logic in the read/write functions takes a register and
36 * an absolute bit number and determines the proper register offset and bit
37 * number in that register. For example, to read the value of GPIO bit 50
38 * the code would access offset ichx_regs[2(=GPIO_LVL)][1(=50/32)],
39 * bit 18 (50%32).
40 */
41enum GPIO_REG {
42 GPIO_USE_SEL = 0,
43 GPIO_IO_SEL,
44 GPIO_LVL,
45 GPO_BLINK
46};
47
48static const u8 ichx_regs[4][3] = {
49 {0x00, 0x30, 0x40}, /* USE_SEL[1-3] offsets */
50 {0x04, 0x34, 0x44}, /* IO_SEL[1-3] offsets */
51 {0x0c, 0x38, 0x48}, /* LVL[1-3] offsets */
52 {0x18, 0x18, 0x18}, /* BLINK offset */
53};
54
55static const u8 ichx_reglen[3] = {
56 0x30, 0x10, 0x10,
57};
58
59static const u8 avoton_regs[4][3] = {
60 {0x00, 0x80, 0x00},
61 {0x04, 0x84, 0x00},
62 {0x08, 0x88, 0x00},
63};
64
65static const u8 avoton_reglen[3] = {
66 0x10, 0x10, 0x00,
67};
68
69#define ICHX_WRITE(val, reg, base_res) outl(val, (reg) + (base_res)->start)
70#define ICHX_READ(reg, base_res) inl((reg) + (base_res)->start)
71
72struct ichx_desc {
73 /* Max GPIO pins the chipset can have */
74 uint ngpio;
75
76 /* chipset registers */
77 const u8 (*regs)[3];
78 const u8 *reglen;
79
80 /* GPO_BLINK is available on this chipset */
81 bool have_blink;
82
83 /* Whether the chipset has GPIO in GPE0_STS in the PM IO region */
84 bool uses_gpe0;
85
86 /* USE_SEL is bogus on some chipsets, eg 3100 */
87 u32 use_sel_ignore[3];
88
89 /* Some chipsets have quirks, let these use their own request/get */
90 int (*request)(struct gpio_chip *chip, unsigned offset);
91 int (*get)(struct gpio_chip *chip, unsigned offset);
92
93 /*
94 * Some chipsets don't let reading output values on GPIO_LVL register
95 * this option allows driver caching written output values
96 */
97 bool use_outlvl_cache;
98};
99
100static struct {
101 spinlock_t lock;
102 struct platform_device *dev;
103 struct gpio_chip chip;
104 struct resource *gpio_base; /* GPIO IO base */
105 struct resource *pm_base; /* Power Mangagment IO base */
106 struct ichx_desc *desc; /* Pointer to chipset-specific description */
107 u32 orig_gpio_ctrl; /* Orig CTRL value, used to restore on exit */
108 u8 use_gpio; /* Which GPIO groups are usable */
109 int outlvl_cache[3]; /* cached output values */
110} ichx_priv;
111
112static int modparam_gpiobase = -1; /* dynamic */
113module_param_named(gpiobase, modparam_gpiobase, int, 0444);
114MODULE_PARM_DESC(gpiobase, "The GPIO number base. -1 means dynamic, "
115 "which is the default.");
116
117static int ichx_write_bit(int reg, unsigned nr, int val, int verify)
118{
119 unsigned long flags;
120 u32 data, tmp;
121 int reg_nr = nr / 32;
122 int bit = nr & 0x1f;
123 int ret = 0;
124
125 spin_lock_irqsave(&ichx_priv.lock, flags);
126
127 if (reg == GPIO_LVL && ichx_priv.desc->use_outlvl_cache)
128 data = ichx_priv.outlvl_cache[reg_nr];
129 else
130 data = ICHX_READ(ichx_priv.desc->regs[reg][reg_nr],
131 ichx_priv.gpio_base);
132
133 if (val)
134 data |= 1 << bit;
135 else
136 data &= ~(1 << bit);
137 ICHX_WRITE(data, ichx_priv.desc->regs[reg][reg_nr],
138 ichx_priv.gpio_base);
139 if (reg == GPIO_LVL && ichx_priv.desc->use_outlvl_cache)
140 ichx_priv.outlvl_cache[reg_nr] = data;
141
142 tmp = ICHX_READ(ichx_priv.desc->regs[reg][reg_nr],
143 ichx_priv.gpio_base);
144 if (verify && data != tmp)
145 ret = -EPERM;
146
147 spin_unlock_irqrestore(&ichx_priv.lock, flags);
148
149 return ret;
150}
151
152static int ichx_read_bit(int reg, unsigned nr)
153{
154 unsigned long flags;
155 u32 data;
156 int reg_nr = nr / 32;
157 int bit = nr & 0x1f;
158
159 spin_lock_irqsave(&ichx_priv.lock, flags);
160
161 data = ICHX_READ(ichx_priv.desc->regs[reg][reg_nr],
162 ichx_priv.gpio_base);
163
164 if (reg == GPIO_LVL && ichx_priv.desc->use_outlvl_cache)
165 data = ichx_priv.outlvl_cache[reg_nr] | data;
166
167 spin_unlock_irqrestore(&ichx_priv.lock, flags);
168
169 return data & (1 << bit) ? 1 : 0;
170}
171
172static bool ichx_gpio_check_available(struct gpio_chip *gpio, unsigned nr)
173{
174 return !!(ichx_priv.use_gpio & (1 << (nr / 32)));
175}
176
177static int ichx_gpio_get_direction(struct gpio_chip *gpio, unsigned nr)
178{
179 return ichx_read_bit(GPIO_IO_SEL, nr) ? GPIOF_DIR_IN : GPIOF_DIR_OUT;
180}
181
182static int ichx_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
183{
184 /*
185 * Try setting pin as an input and verify it worked since many pins
186 * are output-only.
187 */
188 if (ichx_write_bit(GPIO_IO_SEL, nr, 1, 1))
189 return -EINVAL;
190
191 return 0;
192}
193
194static int ichx_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
195 int val)
196{
197 /* Disable blink hardware which is available for GPIOs from 0 to 31. */
198 if (nr < 32 && ichx_priv.desc->have_blink)
199 ichx_write_bit(GPO_BLINK, nr, 0, 0);
200
201 /* Set GPIO output value. */
202 ichx_write_bit(GPIO_LVL, nr, val, 0);
203
204 /*
205 * Try setting pin as an output and verify it worked since many pins
206 * are input-only.
207 */
208 if (ichx_write_bit(GPIO_IO_SEL, nr, 0, 1))
209 return -EINVAL;
210
211 return 0;
212}
213
214static int ichx_gpio_get(struct gpio_chip *chip, unsigned nr)
215{
216 return ichx_read_bit(GPIO_LVL, nr);
217}
218
219static int ich6_gpio_get(struct gpio_chip *chip, unsigned nr)
220{
221 unsigned long flags;
222 u32 data;
223
224 /*
225 * GPI 0 - 15 need to be read from the power management registers on
226 * a ICH6/3100 bridge.
227 */
228 if (nr < 16) {
229 if (!ichx_priv.pm_base)
230 return -ENXIO;
231
232 spin_lock_irqsave(&ichx_priv.lock, flags);
233
234 /* GPI 0 - 15 are latched, write 1 to clear*/
235 ICHX_WRITE(1 << (16 + nr), 0, ichx_priv.pm_base);
236 data = ICHX_READ(0, ichx_priv.pm_base);
237
238 spin_unlock_irqrestore(&ichx_priv.lock, flags);
239
240 return (data >> 16) & (1 << nr) ? 1 : 0;
241 } else {
242 return ichx_gpio_get(chip, nr);
243 }
244}
245
246static int ichx_gpio_request(struct gpio_chip *chip, unsigned nr)
247{
248 if (!ichx_gpio_check_available(chip, nr))
249 return -ENXIO;
250
251 /*
252 * Note we assume the BIOS properly set a bridge's USE value. Some
253 * chips (eg Intel 3100) have bogus USE values though, so first see if
254 * the chipset's USE value can be trusted for this specific bit.
255 * If it can't be trusted, assume that the pin can be used as a GPIO.
256 */
257 if (ichx_priv.desc->use_sel_ignore[nr / 32] & (1 << (nr & 0x1f)))
258 return 0;
259
260 return ichx_read_bit(GPIO_USE_SEL, nr) ? 0 : -ENODEV;
261}
262
263static int ich6_gpio_request(struct gpio_chip *chip, unsigned nr)
264{
265 /*
266 * Fixups for bits 16 and 17 are necessary on the Intel ICH6/3100
267 * bridge as they are controlled by USE register bits 0 and 1. See
268 * "Table 704 GPIO_USE_SEL1 register" in the i3100 datasheet for
269 * additional info.
270 */
271 if (nr == 16 || nr == 17)
272 nr -= 16;
273
274 return ichx_gpio_request(chip, nr);
275}
276
277static void ichx_gpio_set(struct gpio_chip *chip, unsigned nr, int val)
278{
279 ichx_write_bit(GPIO_LVL, nr, val, 0);
280}
281
282static void ichx_gpiolib_setup(struct gpio_chip *chip)
283{
284 chip->owner = THIS_MODULE;
285 chip->label = DRV_NAME;
286 chip->parent = &ichx_priv.dev->dev;
287
288 /* Allow chip-specific overrides of request()/get() */
289 chip->request = ichx_priv.desc->request ?
290 ichx_priv.desc->request : ichx_gpio_request;
291 chip->get = ichx_priv.desc->get ?
292 ichx_priv.desc->get : ichx_gpio_get;
293
294 chip->set = ichx_gpio_set;
295 chip->get_direction = ichx_gpio_get_direction;
296 chip->direction_input = ichx_gpio_direction_input;
297 chip->direction_output = ichx_gpio_direction_output;
298 chip->base = modparam_gpiobase;
299 chip->ngpio = ichx_priv.desc->ngpio;
300 chip->can_sleep = false;
301 chip->dbg_show = NULL;
302}
303
304/* ICH6-based, 631xesb-based */
305static struct ichx_desc ich6_desc = {
306 /* Bridges using the ICH6 controller need fixups for GPIO 0 - 17 */
307 .request = ich6_gpio_request,
308 .get = ich6_gpio_get,
309
310 /* GPIO 0-15 are read in the GPE0_STS PM register */
311 .uses_gpe0 = true,
312
313 .ngpio = 50,
314 .have_blink = true,
315 .regs = ichx_regs,
316 .reglen = ichx_reglen,
317};
318
319/* Intel 3100 */
320static struct ichx_desc i3100_desc = {
321 /*
322 * Bits 16,17, 20 of USE_SEL and bit 16 of USE_SEL2 always read 0 on
323 * the Intel 3100. See "Table 712. GPIO Summary Table" of 3100
324 * Datasheet for more info.
325 */
326 .use_sel_ignore = {0x00130000, 0x00010000, 0x0},
327
328 /* The 3100 needs fixups for GPIO 0 - 17 */
329 .request = ich6_gpio_request,
330 .get = ich6_gpio_get,
331
332 /* GPIO 0-15 are read in the GPE0_STS PM register */
333 .uses_gpe0 = true,
334
335 .ngpio = 50,
336 .regs = ichx_regs,
337 .reglen = ichx_reglen,
338};
339
340/* ICH7 and ICH8-based */
341static struct ichx_desc ich7_desc = {
342 .ngpio = 50,
343 .have_blink = true,
344 .regs = ichx_regs,
345 .reglen = ichx_reglen,
346};
347
348/* ICH9-based */
349static struct ichx_desc ich9_desc = {
350 .ngpio = 61,
351 .have_blink = true,
352 .regs = ichx_regs,
353 .reglen = ichx_reglen,
354};
355
356/* ICH10-based - Consumer/corporate versions have different amount of GPIO */
357static struct ichx_desc ich10_cons_desc = {
358 .ngpio = 61,
359 .have_blink = true,
360 .regs = ichx_regs,
361 .reglen = ichx_reglen,
362};
363static struct ichx_desc ich10_corp_desc = {
364 .ngpio = 72,
365 .have_blink = true,
366 .regs = ichx_regs,
367 .reglen = ichx_reglen,
368};
369
370/* Intel 5 series, 6 series, 3400 series, and C200 series */
371static struct ichx_desc intel5_desc = {
372 .ngpio = 76,
373 .regs = ichx_regs,
374 .reglen = ichx_reglen,
375};
376
377/* Avoton */
378static struct ichx_desc avoton_desc = {
379 /* Avoton has only 59 GPIOs, but we assume the first set of register
380 * (Core) has 32 instead of 31 to keep gpio-ich compliance
381 */
382 .ngpio = 60,
383 .regs = avoton_regs,
384 .reglen = avoton_reglen,
385 .use_outlvl_cache = true,
386};
387
388static int ichx_gpio_request_regions(struct device *dev,
389 struct resource *res_base, const char *name, u8 use_gpio)
390{
391 int i;
392
393 if (!res_base || !res_base->start || !res_base->end)
394 return -ENODEV;
395
396 for (i = 0; i < ARRAY_SIZE(ichx_priv.desc->regs[0]); i++) {
397 if (!(use_gpio & (1 << i)))
398 continue;
399 if (!devm_request_region(dev,
400 res_base->start + ichx_priv.desc->regs[0][i],
401 ichx_priv.desc->reglen[i], name))
402 return -EBUSY;
403 }
404 return 0;
405}
406
407static int ichx_gpio_probe(struct platform_device *pdev)
408{
409 struct resource *res_base, *res_pm;
410 int err;
411 struct lpc_ich_info *ich_info = dev_get_platdata(&pdev->dev);
412
413 if (!ich_info)
414 return -ENODEV;
415
416 ichx_priv.dev = pdev;
417
418 switch (ich_info->gpio_version) {
419 case ICH_I3100_GPIO:
420 ichx_priv.desc = &i3100_desc;
421 break;
422 case ICH_V5_GPIO:
423 ichx_priv.desc = &intel5_desc;
424 break;
425 case ICH_V6_GPIO:
426 ichx_priv.desc = &ich6_desc;
427 break;
428 case ICH_V7_GPIO:
429 ichx_priv.desc = &ich7_desc;
430 break;
431 case ICH_V9_GPIO:
432 ichx_priv.desc = &ich9_desc;
433 break;
434 case ICH_V10CORP_GPIO:
435 ichx_priv.desc = &ich10_corp_desc;
436 break;
437 case ICH_V10CONS_GPIO:
438 ichx_priv.desc = &ich10_cons_desc;
439 break;
440 case AVOTON_GPIO:
441 ichx_priv.desc = &avoton_desc;
442 break;
443 default:
444 return -ENODEV;
445 }
446
447 spin_lock_init(&ichx_priv.lock);
448 res_base = platform_get_resource(pdev, IORESOURCE_IO, ICH_RES_GPIO);
449 ichx_priv.use_gpio = ich_info->use_gpio;
450 err = ichx_gpio_request_regions(&pdev->dev, res_base, pdev->name,
451 ichx_priv.use_gpio);
452 if (err)
453 return err;
454
455 ichx_priv.gpio_base = res_base;
456
457 /*
458 * If necessary, determine the I/O address of ACPI/power management
459 * registers which are needed to read the the GPE0 register for GPI pins
460 * 0 - 15 on some chipsets.
461 */
462 if (!ichx_priv.desc->uses_gpe0)
463 goto init;
464
465 res_pm = platform_get_resource(pdev, IORESOURCE_IO, ICH_RES_GPE0);
466 if (!res_pm) {
467 pr_warn("ACPI BAR is unavailable, GPI 0 - 15 unavailable\n");
468 goto init;
469 }
470
471 if (!devm_request_region(&pdev->dev, res_pm->start,
472 resource_size(res_pm), pdev->name)) {
473 pr_warn("ACPI BAR is busy, GPI 0 - 15 unavailable\n");
474 goto init;
475 }
476
477 ichx_priv.pm_base = res_pm;
478
479init:
480 ichx_gpiolib_setup(&ichx_priv.chip);
481 err = gpiochip_add_data(&ichx_priv.chip, NULL);
482 if (err) {
483 pr_err("Failed to register GPIOs\n");
484 return err;
485 }
486
487 pr_info("GPIO from %d to %d on %s\n", ichx_priv.chip.base,
488 ichx_priv.chip.base + ichx_priv.chip.ngpio - 1, DRV_NAME);
489
490 return 0;
491}
492
493static int ichx_gpio_remove(struct platform_device *pdev)
494{
495 gpiochip_remove(&ichx_priv.chip);
496
497 return 0;
498}
499
500static struct platform_driver ichx_gpio_driver = {
501 .driver = {
502 .name = DRV_NAME,
503 },
504 .probe = ichx_gpio_probe,
505 .remove = ichx_gpio_remove,
506};
507
508module_platform_driver(ichx_gpio_driver);
509
510MODULE_AUTHOR("Peter Tyser <ptyser@xes-inc.com>");
511MODULE_DESCRIPTION("GPIO interface for Intel ICH series");
512MODULE_LICENSE("GPL");
513MODULE_ALIAS("platform:"DRV_NAME);