Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 1 | /* |
Grant Likely | c103de2 | 2011-06-04 18:38:28 -0600 | [diff] [blame] | 2 | * GPIO interface for Intel Poulsbo SCH |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 3 | * |
| 4 | * Copyright (c) 2010 CompuLab Ltd |
| 5 | * Author: Denis Turischev <denis@compulab.co.il> |
| 6 | * |
| 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. |
| 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; see the file COPYING. If not, write to |
| 18 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| 19 | */ |
| 20 | |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/io.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/acpi.h> |
| 27 | #include <linux/platform_device.h> |
Denis Turischev | f04ddfc | 2011-03-14 12:53:05 +0200 | [diff] [blame] | 28 | #include <linux/pci_ids.h> |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 29 | |
| 30 | #include <linux/gpio.h> |
| 31 | |
| 32 | static DEFINE_SPINLOCK(gpio_lock); |
| 33 | |
| 34 | #define CGEN (0x00) |
| 35 | #define CGIO (0x04) |
| 36 | #define CGLV (0x08) |
| 37 | |
| 38 | #define RGEN (0x20) |
| 39 | #define RGIO (0x24) |
| 40 | #define RGLV (0x28) |
| 41 | |
| 42 | static unsigned short gpio_ba; |
| 43 | |
| 44 | static int sch_gpio_core_direction_in(struct gpio_chip *gc, unsigned gpio_num) |
| 45 | { |
| 46 | u8 curr_dirs; |
| 47 | unsigned short offset, bit; |
| 48 | |
| 49 | spin_lock(&gpio_lock); |
| 50 | |
| 51 | offset = CGIO + gpio_num / 8; |
| 52 | bit = gpio_num % 8; |
| 53 | |
| 54 | curr_dirs = inb(gpio_ba + offset); |
| 55 | |
| 56 | if (!(curr_dirs & (1 << bit))) |
| 57 | outb(curr_dirs | (1 << bit), gpio_ba + offset); |
| 58 | |
| 59 | spin_unlock(&gpio_lock); |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | static int sch_gpio_core_get(struct gpio_chip *gc, unsigned gpio_num) |
| 64 | { |
| 65 | int res; |
| 66 | unsigned short offset, bit; |
| 67 | |
| 68 | offset = CGLV + gpio_num / 8; |
| 69 | bit = gpio_num % 8; |
| 70 | |
| 71 | res = !!(inb(gpio_ba + offset) & (1 << bit)); |
| 72 | return res; |
| 73 | } |
| 74 | |
| 75 | static void sch_gpio_core_set(struct gpio_chip *gc, unsigned gpio_num, int val) |
| 76 | { |
| 77 | u8 curr_vals; |
| 78 | unsigned short offset, bit; |
| 79 | |
| 80 | spin_lock(&gpio_lock); |
| 81 | |
| 82 | offset = CGLV + gpio_num / 8; |
| 83 | bit = gpio_num % 8; |
| 84 | |
| 85 | curr_vals = inb(gpio_ba + offset); |
| 86 | |
| 87 | if (val) |
| 88 | outb(curr_vals | (1 << bit), gpio_ba + offset); |
| 89 | else |
| 90 | outb((curr_vals & ~(1 << bit)), gpio_ba + offset); |
| 91 | spin_unlock(&gpio_lock); |
| 92 | } |
| 93 | |
| 94 | static int sch_gpio_core_direction_out(struct gpio_chip *gc, |
| 95 | unsigned gpio_num, int val) |
| 96 | { |
| 97 | u8 curr_dirs; |
| 98 | unsigned short offset, bit; |
| 99 | |
| 100 | sch_gpio_core_set(gc, gpio_num, val); |
| 101 | |
| 102 | spin_lock(&gpio_lock); |
| 103 | |
| 104 | offset = CGIO + gpio_num / 8; |
| 105 | bit = gpio_num % 8; |
| 106 | |
| 107 | curr_dirs = inb(gpio_ba + offset); |
| 108 | if (curr_dirs & (1 << bit)) |
| 109 | outb(curr_dirs & ~(1 << bit), gpio_ba + offset); |
| 110 | |
| 111 | spin_unlock(&gpio_lock); |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 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, |
| 122 | }; |
| 123 | |
| 124 | static int sch_gpio_resume_direction_in(struct gpio_chip *gc, |
| 125 | unsigned gpio_num) |
| 126 | { |
| 127 | u8 curr_dirs; |
Darren Hart | 3cbf182 | 2013-03-06 13:49:36 -0800 | [diff] [blame^] | 128 | unsigned short offset, bit; |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 129 | |
| 130 | spin_lock(&gpio_lock); |
| 131 | |
Darren Hart | 3cbf182 | 2013-03-06 13:49:36 -0800 | [diff] [blame^] | 132 | offset = RGIO + gpio_num / 8; |
| 133 | bit = gpio_num % 8; |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 134 | |
Darren Hart | 3cbf182 | 2013-03-06 13:49:36 -0800 | [diff] [blame^] | 135 | curr_dirs = inb(gpio_ba + offset); |
| 136 | |
| 137 | if (!(curr_dirs & (1 << bit))) |
| 138 | outb(curr_dirs | (1 << bit), gpio_ba + offset); |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 139 | |
| 140 | spin_unlock(&gpio_lock); |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | static int sch_gpio_resume_get(struct gpio_chip *gc, unsigned gpio_num) |
| 145 | { |
Darren Hart | 3cbf182 | 2013-03-06 13:49:36 -0800 | [diff] [blame^] | 146 | unsigned short offset, bit; |
| 147 | |
| 148 | offset = RGLV + gpio_num / 8; |
| 149 | bit = gpio_num % 8; |
| 150 | |
| 151 | return !!(inb(gpio_ba + offset) & (1 << bit)); |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | static void sch_gpio_resume_set(struct gpio_chip *gc, |
| 155 | unsigned gpio_num, int val) |
| 156 | { |
| 157 | u8 curr_vals; |
Darren Hart | 3cbf182 | 2013-03-06 13:49:36 -0800 | [diff] [blame^] | 158 | unsigned short offset, bit; |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 159 | |
| 160 | spin_lock(&gpio_lock); |
| 161 | |
Darren Hart | 3cbf182 | 2013-03-06 13:49:36 -0800 | [diff] [blame^] | 162 | offset = RGLV + gpio_num / 8; |
| 163 | bit = gpio_num % 8; |
| 164 | |
| 165 | curr_vals = inb(gpio_ba + offset); |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 166 | |
| 167 | if (val) |
Darren Hart | 3cbf182 | 2013-03-06 13:49:36 -0800 | [diff] [blame^] | 168 | outb(curr_vals | (1 << bit), gpio_ba + offset); |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 169 | else |
Darren Hart | 3cbf182 | 2013-03-06 13:49:36 -0800 | [diff] [blame^] | 170 | outb((curr_vals & ~(1 << bit)), gpio_ba + offset); |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 171 | |
| 172 | spin_unlock(&gpio_lock); |
| 173 | } |
| 174 | |
| 175 | static int sch_gpio_resume_direction_out(struct gpio_chip *gc, |
| 176 | unsigned gpio_num, int val) |
| 177 | { |
| 178 | u8 curr_dirs; |
Darren Hart | 3cbf182 | 2013-03-06 13:49:36 -0800 | [diff] [blame^] | 179 | unsigned short offset, bit; |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 180 | |
| 181 | sch_gpio_resume_set(gc, gpio_num, val); |
| 182 | |
Darren Hart | 3cbf182 | 2013-03-06 13:49:36 -0800 | [diff] [blame^] | 183 | offset = RGIO + gpio_num / 8; |
| 184 | bit = gpio_num % 8; |
| 185 | |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 186 | spin_lock(&gpio_lock); |
| 187 | |
Darren Hart | 3cbf182 | 2013-03-06 13:49:36 -0800 | [diff] [blame^] | 188 | curr_dirs = inb(gpio_ba + offset); |
| 189 | if (curr_dirs & (1 << bit)) |
| 190 | outb(curr_dirs & ~(1 << bit), gpio_ba + offset); |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 191 | |
| 192 | spin_unlock(&gpio_lock); |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | static struct gpio_chip sch_gpio_resume = { |
| 197 | .label = "sch_gpio_resume", |
| 198 | .owner = THIS_MODULE, |
| 199 | .direction_input = sch_gpio_resume_direction_in, |
| 200 | .get = sch_gpio_resume_get, |
| 201 | .direction_output = sch_gpio_resume_direction_out, |
| 202 | .set = sch_gpio_resume_set, |
| 203 | }; |
| 204 | |
Bill Pemberton | 3836309 | 2012-11-19 13:22:34 -0500 | [diff] [blame] | 205 | static int sch_gpio_probe(struct platform_device *pdev) |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 206 | { |
| 207 | struct resource *res; |
Denis Turischev | f04ddfc | 2011-03-14 12:53:05 +0200 | [diff] [blame] | 208 | int err, id; |
| 209 | |
| 210 | id = pdev->id; |
| 211 | if (!id) |
| 212 | return -ENODEV; |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 213 | |
| 214 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); |
| 215 | if (!res) |
| 216 | return -EBUSY; |
| 217 | |
| 218 | if (!request_region(res->start, resource_size(res), pdev->name)) |
| 219 | return -EBUSY; |
| 220 | |
| 221 | gpio_ba = res->start; |
| 222 | |
Denis Turischev | f04ddfc | 2011-03-14 12:53:05 +0200 | [diff] [blame] | 223 | switch (id) { |
| 224 | case PCI_DEVICE_ID_INTEL_SCH_LPC: |
| 225 | sch_gpio_core.base = 0; |
| 226 | sch_gpio_core.ngpio = 10; |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 227 | |
Denis Turischev | f04ddfc | 2011-03-14 12:53:05 +0200 | [diff] [blame] | 228 | sch_gpio_resume.base = 10; |
| 229 | sch_gpio_resume.ngpio = 4; |
| 230 | |
| 231 | /* |
| 232 | * GPIO[6:0] enabled by default |
| 233 | * GPIO7 is configured by the CMC as SLPIOVR |
| 234 | * Enable GPIO[9:8] core powered gpios explicitly |
| 235 | */ |
| 236 | outb(0x3, gpio_ba + CGEN + 1); |
| 237 | /* |
| 238 | * SUS_GPIO[2:0] enabled by default |
| 239 | * Enable SUS_GPIO3 resume powered gpio explicitly |
| 240 | */ |
| 241 | outb(0x8, gpio_ba + RGEN); |
| 242 | break; |
| 243 | |
| 244 | case PCI_DEVICE_ID_INTEL_ITC_LPC: |
| 245 | sch_gpio_core.base = 0; |
| 246 | sch_gpio_core.ngpio = 5; |
| 247 | |
| 248 | sch_gpio_resume.base = 5; |
| 249 | sch_gpio_resume.ngpio = 9; |
| 250 | break; |
| 251 | |
Seth Heasley | 77820ff | 2012-05-22 22:54:20 +0200 | [diff] [blame] | 252 | case PCI_DEVICE_ID_INTEL_CENTERTON_ILB: |
| 253 | sch_gpio_core.base = 0; |
| 254 | sch_gpio_core.ngpio = 21; |
| 255 | |
| 256 | sch_gpio_resume.base = 21; |
| 257 | sch_gpio_resume.ngpio = 9; |
| 258 | break; |
| 259 | |
Denis Turischev | f04ddfc | 2011-03-14 12:53:05 +0200 | [diff] [blame] | 260 | default: |
Alan Cox | 8abdd2d | 2012-07-24 13:55:10 +0100 | [diff] [blame] | 261 | err = -ENODEV; |
| 262 | goto err_sch_gpio_core; |
Denis Turischev | f04ddfc | 2011-03-14 12:53:05 +0200 | [diff] [blame] | 263 | } |
| 264 | |
| 265 | sch_gpio_core.dev = &pdev->dev; |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 266 | sch_gpio_resume.dev = &pdev->dev; |
| 267 | |
| 268 | err = gpiochip_add(&sch_gpio_core); |
| 269 | if (err < 0) |
| 270 | goto err_sch_gpio_core; |
| 271 | |
| 272 | err = gpiochip_add(&sch_gpio_resume); |
| 273 | if (err < 0) |
| 274 | goto err_sch_gpio_resume; |
| 275 | |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 276 | return 0; |
| 277 | |
| 278 | err_sch_gpio_resume: |
Samuel Ortiz | 8e7aafe | 2010-03-05 17:14:01 +0100 | [diff] [blame] | 279 | err = gpiochip_remove(&sch_gpio_core); |
| 280 | if (err) |
| 281 | dev_err(&pdev->dev, "%s failed, %d\n", |
| 282 | "gpiochip_remove()", err); |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 283 | |
| 284 | err_sch_gpio_core: |
| 285 | release_region(res->start, resource_size(res)); |
| 286 | gpio_ba = 0; |
| 287 | |
| 288 | return err; |
| 289 | } |
| 290 | |
Bill Pemberton | 206210c | 2012-11-19 13:25:50 -0500 | [diff] [blame] | 291 | static int sch_gpio_remove(struct platform_device *pdev) |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 292 | { |
| 293 | struct resource *res; |
| 294 | if (gpio_ba) { |
Samuel Ortiz | 8e7aafe | 2010-03-05 17:14:01 +0100 | [diff] [blame] | 295 | int err; |
| 296 | |
| 297 | err = gpiochip_remove(&sch_gpio_core); |
| 298 | if (err) |
| 299 | dev_err(&pdev->dev, "%s failed, %d\n", |
| 300 | "gpiochip_remove()", err); |
| 301 | err = gpiochip_remove(&sch_gpio_resume); |
| 302 | if (err) |
| 303 | dev_err(&pdev->dev, "%s failed, %d\n", |
| 304 | "gpiochip_remove()", err); |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 305 | |
| 306 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); |
| 307 | |
| 308 | release_region(res->start, resource_size(res)); |
| 309 | gpio_ba = 0; |
Samuel Ortiz | 8e7aafe | 2010-03-05 17:14:01 +0100 | [diff] [blame] | 310 | |
| 311 | return err; |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 312 | } |
| 313 | |
| 314 | return 0; |
| 315 | } |
| 316 | |
| 317 | static struct platform_driver sch_gpio_driver = { |
| 318 | .driver = { |
| 319 | .name = "sch_gpio", |
| 320 | .owner = THIS_MODULE, |
| 321 | }, |
| 322 | .probe = sch_gpio_probe, |
Bill Pemberton | 8283c4f | 2012-11-19 13:20:08 -0500 | [diff] [blame] | 323 | .remove = sch_gpio_remove, |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 324 | }; |
| 325 | |
Mark Brown | 6f61415 | 2011-12-08 00:24:00 +0800 | [diff] [blame] | 326 | module_platform_driver(sch_gpio_driver); |
Denis Turischev | be9b06b | 2010-03-02 10:48:55 +0100 | [diff] [blame] | 327 | |
| 328 | MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>"); |
| 329 | MODULE_DESCRIPTION("GPIO interface for Intel Poulsbo SCH"); |
| 330 | MODULE_LICENSE("GPL"); |
| 331 | MODULE_ALIAS("platform:sch_gpio"); |