Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 1 | /* |
| 2 | * pin-controller/pin-mux/pin-config/gpio-driver for Samsung's SoC's. |
| 3 | * |
| 4 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. |
| 5 | * http://www.samsung.com |
| 6 | * Copyright (c) 2012 Linaro Ltd |
| 7 | * http://www.linaro.org |
| 8 | * |
| 9 | * Author: Thomas Abraham <thomas.ab@samsung.com> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This driver implements the Samsung pinctrl driver. It supports setting up of |
| 17 | * pinmux and pinconf configurations. The gpiolib interface is also included. |
| 18 | * External interrupt (gpio and wakeup) support are not included in this driver |
| 19 | * but provides extensions to which platform specific implementation of the gpio |
| 20 | * and wakeup interrupts can be hooked to. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/platform_device.h> |
| 25 | #include <linux/io.h> |
| 26 | #include <linux/slab.h> |
| 27 | #include <linux/err.h> |
| 28 | #include <linux/gpio.h> |
Tomasz Figa | a19fe2d | 2012-10-11 10:11:20 +0200 | [diff] [blame] | 29 | #include <linux/irqdomain.h> |
Tomasz Figa | 1984695 | 2013-03-18 22:31:50 +0100 | [diff] [blame] | 30 | #include <linux/spinlock.h> |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 31 | |
| 32 | #include "core.h" |
| 33 | #include "pinctrl-samsung.h" |
| 34 | |
| 35 | #define GROUP_SUFFIX "-grp" |
| 36 | #define GSUFFIX_LEN sizeof(GROUP_SUFFIX) |
| 37 | #define FUNCTION_SUFFIX "-mux" |
| 38 | #define FSUFFIX_LEN sizeof(FUNCTION_SUFFIX) |
| 39 | |
| 40 | /* list of all possible config options supported */ |
Axel Lin | d5fd5da | 2012-12-10 09:54:03 +0900 | [diff] [blame] | 41 | static struct pin_config { |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 42 | char *prop_cfg; |
| 43 | unsigned int cfg_type; |
| 44 | } pcfgs[] = { |
| 45 | { "samsung,pin-pud", PINCFG_TYPE_PUD }, |
| 46 | { "samsung,pin-drv", PINCFG_TYPE_DRV }, |
| 47 | { "samsung,pin-con-pdn", PINCFG_TYPE_CON_PDN }, |
| 48 | { "samsung,pin-pud-pdn", PINCFG_TYPE_PUD_PDN }, |
| 49 | }; |
| 50 | |
Sachin Kamat | 6fb6f1ba | 2012-11-24 11:20:51 +0900 | [diff] [blame] | 51 | static unsigned int pin_base; |
Tomasz Figa | 40ba622 | 2012-10-11 10:11:09 +0200 | [diff] [blame] | 52 | |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 53 | static inline struct samsung_pin_bank *gc_to_pin_bank(struct gpio_chip *gc) |
| 54 | { |
| 55 | return container_of(gc, struct samsung_pin_bank, gpio_chip); |
| 56 | } |
| 57 | |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 58 | /* check if the selector is a valid pin group selector */ |
| 59 | static int samsung_get_group_count(struct pinctrl_dev *pctldev) |
| 60 | { |
| 61 | struct samsung_pinctrl_drv_data *drvdata; |
| 62 | |
| 63 | drvdata = pinctrl_dev_get_drvdata(pctldev); |
| 64 | return drvdata->nr_groups; |
| 65 | } |
| 66 | |
| 67 | /* return the name of the group selected by the group selector */ |
| 68 | static const char *samsung_get_group_name(struct pinctrl_dev *pctldev, |
| 69 | unsigned selector) |
| 70 | { |
| 71 | struct samsung_pinctrl_drv_data *drvdata; |
| 72 | |
| 73 | drvdata = pinctrl_dev_get_drvdata(pctldev); |
| 74 | return drvdata->pin_groups[selector].name; |
| 75 | } |
| 76 | |
| 77 | /* return the pin numbers associated with the specified group */ |
| 78 | static int samsung_get_group_pins(struct pinctrl_dev *pctldev, |
| 79 | unsigned selector, const unsigned **pins, unsigned *num_pins) |
| 80 | { |
| 81 | struct samsung_pinctrl_drv_data *drvdata; |
| 82 | |
| 83 | drvdata = pinctrl_dev_get_drvdata(pctldev); |
| 84 | *pins = drvdata->pin_groups[selector].pins; |
| 85 | *num_pins = drvdata->pin_groups[selector].num_pins; |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | /* create pinctrl_map entries by parsing device tree nodes */ |
| 90 | static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev, |
| 91 | struct device_node *np, struct pinctrl_map **maps, |
| 92 | unsigned *nmaps) |
| 93 | { |
| 94 | struct device *dev = pctldev->dev; |
| 95 | struct pinctrl_map *map; |
| 96 | unsigned long *cfg = NULL; |
| 97 | char *gname, *fname; |
| 98 | int cfg_cnt = 0, map_cnt = 0, idx = 0; |
| 99 | |
| 100 | /* count the number of config options specfied in the node */ |
| 101 | for (idx = 0; idx < ARRAY_SIZE(pcfgs); idx++) { |
| 102 | if (of_find_property(np, pcfgs[idx].prop_cfg, NULL)) |
| 103 | cfg_cnt++; |
| 104 | } |
| 105 | |
| 106 | /* |
| 107 | * Find out the number of map entries to create. All the config options |
| 108 | * can be accomadated into a single config map entry. |
| 109 | */ |
| 110 | if (cfg_cnt) |
| 111 | map_cnt = 1; |
| 112 | if (of_find_property(np, "samsung,pin-function", NULL)) |
| 113 | map_cnt++; |
| 114 | if (!map_cnt) { |
| 115 | dev_err(dev, "node %s does not have either config or function " |
| 116 | "configurations\n", np->name); |
| 117 | return -EINVAL; |
| 118 | } |
| 119 | |
| 120 | /* Allocate memory for pin-map entries */ |
| 121 | map = kzalloc(sizeof(*map) * map_cnt, GFP_KERNEL); |
| 122 | if (!map) { |
| 123 | dev_err(dev, "could not alloc memory for pin-maps\n"); |
| 124 | return -ENOMEM; |
| 125 | } |
| 126 | *nmaps = 0; |
| 127 | |
| 128 | /* |
| 129 | * Allocate memory for pin group name. The pin group name is derived |
| 130 | * from the node name from which these map entries are be created. |
| 131 | */ |
| 132 | gname = kzalloc(strlen(np->name) + GSUFFIX_LEN, GFP_KERNEL); |
| 133 | if (!gname) { |
| 134 | dev_err(dev, "failed to alloc memory for group name\n"); |
| 135 | goto free_map; |
| 136 | } |
| 137 | sprintf(gname, "%s%s", np->name, GROUP_SUFFIX); |
| 138 | |
| 139 | /* |
| 140 | * don't have config options? then skip over to creating function |
| 141 | * map entries. |
| 142 | */ |
| 143 | if (!cfg_cnt) |
| 144 | goto skip_cfgs; |
| 145 | |
| 146 | /* Allocate memory for config entries */ |
| 147 | cfg = kzalloc(sizeof(*cfg) * cfg_cnt, GFP_KERNEL); |
| 148 | if (!cfg) { |
| 149 | dev_err(dev, "failed to alloc memory for configs\n"); |
| 150 | goto free_gname; |
| 151 | } |
| 152 | |
| 153 | /* Prepare a list of config settings */ |
| 154 | for (idx = 0, cfg_cnt = 0; idx < ARRAY_SIZE(pcfgs); idx++) { |
| 155 | u32 value; |
| 156 | if (!of_property_read_u32(np, pcfgs[idx].prop_cfg, &value)) |
| 157 | cfg[cfg_cnt++] = |
| 158 | PINCFG_PACK(pcfgs[idx].cfg_type, value); |
| 159 | } |
| 160 | |
| 161 | /* create the config map entry */ |
| 162 | map[*nmaps].data.configs.group_or_pin = gname; |
| 163 | map[*nmaps].data.configs.configs = cfg; |
| 164 | map[*nmaps].data.configs.num_configs = cfg_cnt; |
| 165 | map[*nmaps].type = PIN_MAP_TYPE_CONFIGS_GROUP; |
| 166 | *nmaps += 1; |
| 167 | |
| 168 | skip_cfgs: |
| 169 | /* create the function map entry */ |
| 170 | if (of_find_property(np, "samsung,pin-function", NULL)) { |
| 171 | fname = kzalloc(strlen(np->name) + FSUFFIX_LEN, GFP_KERNEL); |
| 172 | if (!fname) { |
| 173 | dev_err(dev, "failed to alloc memory for func name\n"); |
| 174 | goto free_cfg; |
| 175 | } |
| 176 | sprintf(fname, "%s%s", np->name, FUNCTION_SUFFIX); |
| 177 | |
| 178 | map[*nmaps].data.mux.group = gname; |
| 179 | map[*nmaps].data.mux.function = fname; |
| 180 | map[*nmaps].type = PIN_MAP_TYPE_MUX_GROUP; |
| 181 | *nmaps += 1; |
| 182 | } |
| 183 | |
| 184 | *maps = map; |
| 185 | return 0; |
| 186 | |
| 187 | free_cfg: |
| 188 | kfree(cfg); |
| 189 | free_gname: |
| 190 | kfree(gname); |
| 191 | free_map: |
| 192 | kfree(map); |
| 193 | return -ENOMEM; |
| 194 | } |
| 195 | |
| 196 | /* free the memory allocated to hold the pin-map table */ |
| 197 | static void samsung_dt_free_map(struct pinctrl_dev *pctldev, |
| 198 | struct pinctrl_map *map, unsigned num_maps) |
| 199 | { |
| 200 | int idx; |
| 201 | |
| 202 | for (idx = 0; idx < num_maps; idx++) { |
| 203 | if (map[idx].type == PIN_MAP_TYPE_MUX_GROUP) { |
| 204 | kfree(map[idx].data.mux.function); |
| 205 | if (!idx) |
| 206 | kfree(map[idx].data.mux.group); |
| 207 | } else if (map->type == PIN_MAP_TYPE_CONFIGS_GROUP) { |
| 208 | kfree(map[idx].data.configs.configs); |
| 209 | if (!idx) |
| 210 | kfree(map[idx].data.configs.group_or_pin); |
| 211 | } |
| 212 | }; |
| 213 | |
| 214 | kfree(map); |
| 215 | } |
| 216 | |
| 217 | /* list of pinctrl callbacks for the pinctrl core */ |
Laurent Pinchart | 022ab14 | 2013-02-16 10:25:07 +0100 | [diff] [blame] | 218 | static const struct pinctrl_ops samsung_pctrl_ops = { |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 219 | .get_groups_count = samsung_get_group_count, |
| 220 | .get_group_name = samsung_get_group_name, |
| 221 | .get_group_pins = samsung_get_group_pins, |
| 222 | .dt_node_to_map = samsung_dt_node_to_map, |
| 223 | .dt_free_map = samsung_dt_free_map, |
| 224 | }; |
| 225 | |
| 226 | /* check if the selector is a valid pin function selector */ |
| 227 | static int samsung_get_functions_count(struct pinctrl_dev *pctldev) |
| 228 | { |
| 229 | struct samsung_pinctrl_drv_data *drvdata; |
| 230 | |
| 231 | drvdata = pinctrl_dev_get_drvdata(pctldev); |
| 232 | return drvdata->nr_functions; |
| 233 | } |
| 234 | |
| 235 | /* return the name of the pin function specified */ |
| 236 | static const char *samsung_pinmux_get_fname(struct pinctrl_dev *pctldev, |
| 237 | unsigned selector) |
| 238 | { |
| 239 | struct samsung_pinctrl_drv_data *drvdata; |
| 240 | |
| 241 | drvdata = pinctrl_dev_get_drvdata(pctldev); |
| 242 | return drvdata->pmx_functions[selector].name; |
| 243 | } |
| 244 | |
| 245 | /* return the groups associated for the specified function selector */ |
| 246 | static int samsung_pinmux_get_groups(struct pinctrl_dev *pctldev, |
| 247 | unsigned selector, const char * const **groups, |
| 248 | unsigned * const num_groups) |
| 249 | { |
| 250 | struct samsung_pinctrl_drv_data *drvdata; |
| 251 | |
| 252 | drvdata = pinctrl_dev_get_drvdata(pctldev); |
| 253 | *groups = drvdata->pmx_functions[selector].groups; |
| 254 | *num_groups = drvdata->pmx_functions[selector].num_groups; |
| 255 | return 0; |
| 256 | } |
| 257 | |
| 258 | /* |
| 259 | * given a pin number that is local to a pin controller, find out the pin bank |
| 260 | * and the register base of the pin bank. |
| 261 | */ |
Tomasz Figa | 62f14c0 | 2012-10-11 10:11:08 +0200 | [diff] [blame] | 262 | static void pin_to_reg_bank(struct samsung_pinctrl_drv_data *drvdata, |
| 263 | unsigned pin, void __iomem **reg, u32 *offset, |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 264 | struct samsung_pin_bank **bank) |
| 265 | { |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 266 | struct samsung_pin_bank *b; |
| 267 | |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 268 | b = drvdata->ctrl->pin_banks; |
| 269 | |
| 270 | while ((pin >= b->pin_base) && |
| 271 | ((b->pin_base + b->nr_pins - 1) < pin)) |
| 272 | b++; |
| 273 | |
| 274 | *reg = drvdata->virt_base + b->pctl_offset; |
| 275 | *offset = pin - b->pin_base; |
| 276 | if (bank) |
| 277 | *bank = b; |
| 278 | |
| 279 | /* some banks have two config registers in a single bank */ |
| 280 | if (*offset * b->func_width > BITS_PER_LONG) |
| 281 | *reg += 4; |
| 282 | } |
| 283 | |
| 284 | /* enable or disable a pinmux function */ |
| 285 | static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector, |
| 286 | unsigned group, bool enable) |
| 287 | { |
| 288 | struct samsung_pinctrl_drv_data *drvdata; |
| 289 | const unsigned int *pins; |
| 290 | struct samsung_pin_bank *bank; |
| 291 | void __iomem *reg; |
| 292 | u32 mask, shift, data, pin_offset, cnt; |
Tomasz Figa | 1984695 | 2013-03-18 22:31:50 +0100 | [diff] [blame] | 293 | unsigned long flags; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 294 | |
| 295 | drvdata = pinctrl_dev_get_drvdata(pctldev); |
| 296 | pins = drvdata->pin_groups[group].pins; |
| 297 | |
| 298 | /* |
| 299 | * for each pin in the pin group selected, program the correspoding pin |
| 300 | * pin function number in the config register. |
| 301 | */ |
| 302 | for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++) { |
Tomasz Figa | 499147c | 2013-03-18 22:31:52 +0100 | [diff] [blame^] | 303 | struct samsung_pin_bank_type *type; |
| 304 | |
Tomasz Figa | 62f14c0 | 2012-10-11 10:11:08 +0200 | [diff] [blame] | 305 | pin_to_reg_bank(drvdata, pins[cnt] - drvdata->ctrl->base, |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 306 | ®, &pin_offset, &bank); |
Tomasz Figa | 499147c | 2013-03-18 22:31:52 +0100 | [diff] [blame^] | 307 | type = bank->type; |
| 308 | mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1; |
| 309 | shift = pin_offset * type->fld_width[PINCFG_TYPE_FUNC]; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 310 | |
Tomasz Figa | 1984695 | 2013-03-18 22:31:50 +0100 | [diff] [blame] | 311 | spin_lock_irqsave(&bank->slock, flags); |
| 312 | |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 313 | data = readl(reg); |
| 314 | data &= ~(mask << shift); |
| 315 | if (enable) |
| 316 | data |= drvdata->pin_groups[group].func << shift; |
| 317 | writel(data, reg); |
Tomasz Figa | 1984695 | 2013-03-18 22:31:50 +0100 | [diff] [blame] | 318 | |
| 319 | spin_unlock_irqrestore(&bank->slock, flags); |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 320 | } |
| 321 | } |
| 322 | |
| 323 | /* enable a specified pinmux by writing to registers */ |
| 324 | static int samsung_pinmux_enable(struct pinctrl_dev *pctldev, unsigned selector, |
| 325 | unsigned group) |
| 326 | { |
| 327 | samsung_pinmux_setup(pctldev, selector, group, true); |
| 328 | return 0; |
| 329 | } |
| 330 | |
| 331 | /* disable a specified pinmux by writing to registers */ |
| 332 | static void samsung_pinmux_disable(struct pinctrl_dev *pctldev, |
| 333 | unsigned selector, unsigned group) |
| 334 | { |
| 335 | samsung_pinmux_setup(pctldev, selector, group, false); |
| 336 | } |
| 337 | |
| 338 | /* |
| 339 | * The calls to gpio_direction_output() and gpio_direction_input() |
| 340 | * leads to this function call (via the pinctrl_gpio_direction_{input|output}() |
| 341 | * function called from the gpiolib interface). |
| 342 | */ |
| 343 | static int samsung_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev, |
| 344 | struct pinctrl_gpio_range *range, unsigned offset, bool input) |
| 345 | { |
Tomasz Figa | 499147c | 2013-03-18 22:31:52 +0100 | [diff] [blame^] | 346 | struct samsung_pin_bank_type *type; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 347 | struct samsung_pin_bank *bank; |
Tomasz Figa | 62f14c0 | 2012-10-11 10:11:08 +0200 | [diff] [blame] | 348 | struct samsung_pinctrl_drv_data *drvdata; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 349 | void __iomem *reg; |
| 350 | u32 data, pin_offset, mask, shift; |
Tomasz Figa | 1984695 | 2013-03-18 22:31:50 +0100 | [diff] [blame] | 351 | unsigned long flags; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 352 | |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 353 | bank = gc_to_pin_bank(range->gc); |
Tomasz Figa | 499147c | 2013-03-18 22:31:52 +0100 | [diff] [blame^] | 354 | type = bank->type; |
Tomasz Figa | 62f14c0 | 2012-10-11 10:11:08 +0200 | [diff] [blame] | 355 | drvdata = pinctrl_dev_get_drvdata(pctldev); |
| 356 | |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 357 | pin_offset = offset - bank->pin_base; |
| 358 | reg = drvdata->virt_base + bank->pctl_offset; |
| 359 | |
Tomasz Figa | 499147c | 2013-03-18 22:31:52 +0100 | [diff] [blame^] | 360 | mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1; |
| 361 | shift = pin_offset * type->fld_width[PINCFG_TYPE_FUNC]; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 362 | |
Tomasz Figa | 1984695 | 2013-03-18 22:31:50 +0100 | [diff] [blame] | 363 | spin_lock_irqsave(&bank->slock, flags); |
| 364 | |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 365 | data = readl(reg); |
| 366 | data &= ~(mask << shift); |
| 367 | if (!input) |
| 368 | data |= FUNC_OUTPUT << shift; |
| 369 | writel(data, reg); |
Tomasz Figa | 1984695 | 2013-03-18 22:31:50 +0100 | [diff] [blame] | 370 | |
| 371 | spin_unlock_irqrestore(&bank->slock, flags); |
| 372 | |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 373 | return 0; |
| 374 | } |
| 375 | |
| 376 | /* list of pinmux callbacks for the pinmux vertical in pinctrl core */ |
Laurent Pinchart | 022ab14 | 2013-02-16 10:25:07 +0100 | [diff] [blame] | 377 | static const struct pinmux_ops samsung_pinmux_ops = { |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 378 | .get_functions_count = samsung_get_functions_count, |
| 379 | .get_function_name = samsung_pinmux_get_fname, |
| 380 | .get_function_groups = samsung_pinmux_get_groups, |
| 381 | .enable = samsung_pinmux_enable, |
| 382 | .disable = samsung_pinmux_disable, |
| 383 | .gpio_set_direction = samsung_pinmux_gpio_set_direction, |
| 384 | }; |
| 385 | |
| 386 | /* set or get the pin config settings for a specified pin */ |
| 387 | static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin, |
| 388 | unsigned long *config, bool set) |
| 389 | { |
| 390 | struct samsung_pinctrl_drv_data *drvdata; |
Tomasz Figa | 499147c | 2013-03-18 22:31:52 +0100 | [diff] [blame^] | 391 | struct samsung_pin_bank_type *type; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 392 | struct samsung_pin_bank *bank; |
| 393 | void __iomem *reg_base; |
| 394 | enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config); |
| 395 | u32 data, width, pin_offset, mask, shift; |
| 396 | u32 cfg_value, cfg_reg; |
Tomasz Figa | 1984695 | 2013-03-18 22:31:50 +0100 | [diff] [blame] | 397 | unsigned long flags; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 398 | |
| 399 | drvdata = pinctrl_dev_get_drvdata(pctldev); |
Tomasz Figa | 62f14c0 | 2012-10-11 10:11:08 +0200 | [diff] [blame] | 400 | pin_to_reg_bank(drvdata, pin - drvdata->ctrl->base, ®_base, |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 401 | &pin_offset, &bank); |
Tomasz Figa | 499147c | 2013-03-18 22:31:52 +0100 | [diff] [blame^] | 402 | type = bank->type; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 403 | |
| 404 | switch (cfg_type) { |
| 405 | case PINCFG_TYPE_PUD: |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 406 | cfg_reg = PUD_REG; |
| 407 | break; |
| 408 | case PINCFG_TYPE_DRV: |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 409 | cfg_reg = DRV_REG; |
| 410 | break; |
| 411 | case PINCFG_TYPE_CON_PDN: |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 412 | cfg_reg = CONPDN_REG; |
| 413 | break; |
| 414 | case PINCFG_TYPE_PUD_PDN: |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 415 | cfg_reg = PUDPDN_REG; |
| 416 | break; |
| 417 | default: |
| 418 | WARN_ON(1); |
| 419 | return -EINVAL; |
| 420 | } |
| 421 | |
Tomasz Figa | 499147c | 2013-03-18 22:31:52 +0100 | [diff] [blame^] | 422 | if (cfg_type >= PINCFG_TYPE_NUM || !type->fld_width[cfg_type]) |
Tomasz Figa | 7c367d3 | 2012-10-11 10:11:07 +0200 | [diff] [blame] | 423 | return -EINVAL; |
| 424 | |
Tomasz Figa | 499147c | 2013-03-18 22:31:52 +0100 | [diff] [blame^] | 425 | width = type->fld_width[cfg_type]; |
| 426 | |
Tomasz Figa | 1984695 | 2013-03-18 22:31:50 +0100 | [diff] [blame] | 427 | spin_lock_irqsave(&bank->slock, flags); |
| 428 | |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 429 | mask = (1 << width) - 1; |
| 430 | shift = pin_offset * width; |
| 431 | data = readl(reg_base + cfg_reg); |
| 432 | |
| 433 | if (set) { |
| 434 | cfg_value = PINCFG_UNPACK_VALUE(*config); |
| 435 | data &= ~(mask << shift); |
| 436 | data |= (cfg_value << shift); |
| 437 | writel(data, reg_base + cfg_reg); |
| 438 | } else { |
| 439 | data >>= shift; |
| 440 | data &= mask; |
| 441 | *config = PINCFG_PACK(cfg_type, data); |
| 442 | } |
Tomasz Figa | 1984695 | 2013-03-18 22:31:50 +0100 | [diff] [blame] | 443 | |
| 444 | spin_unlock_irqrestore(&bank->slock, flags); |
| 445 | |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 446 | return 0; |
| 447 | } |
| 448 | |
| 449 | /* set the pin config settings for a specified pin */ |
| 450 | static int samsung_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin, |
| 451 | unsigned long config) |
| 452 | { |
| 453 | return samsung_pinconf_rw(pctldev, pin, &config, true); |
| 454 | } |
| 455 | |
| 456 | /* get the pin config settings for a specified pin */ |
| 457 | static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin, |
| 458 | unsigned long *config) |
| 459 | { |
| 460 | return samsung_pinconf_rw(pctldev, pin, config, false); |
| 461 | } |
| 462 | |
| 463 | /* set the pin config settings for a specified pin group */ |
| 464 | static int samsung_pinconf_group_set(struct pinctrl_dev *pctldev, |
| 465 | unsigned group, unsigned long config) |
| 466 | { |
| 467 | struct samsung_pinctrl_drv_data *drvdata; |
| 468 | const unsigned int *pins; |
| 469 | unsigned int cnt; |
| 470 | |
| 471 | drvdata = pinctrl_dev_get_drvdata(pctldev); |
| 472 | pins = drvdata->pin_groups[group].pins; |
| 473 | |
| 474 | for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++) |
| 475 | samsung_pinconf_set(pctldev, pins[cnt], config); |
| 476 | |
| 477 | return 0; |
| 478 | } |
| 479 | |
| 480 | /* get the pin config settings for a specified pin group */ |
| 481 | static int samsung_pinconf_group_get(struct pinctrl_dev *pctldev, |
| 482 | unsigned int group, unsigned long *config) |
| 483 | { |
| 484 | struct samsung_pinctrl_drv_data *drvdata; |
| 485 | const unsigned int *pins; |
| 486 | |
| 487 | drvdata = pinctrl_dev_get_drvdata(pctldev); |
| 488 | pins = drvdata->pin_groups[group].pins; |
| 489 | samsung_pinconf_get(pctldev, pins[0], config); |
| 490 | return 0; |
| 491 | } |
| 492 | |
| 493 | /* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */ |
Laurent Pinchart | 022ab14 | 2013-02-16 10:25:07 +0100 | [diff] [blame] | 494 | static const struct pinconf_ops samsung_pinconf_ops = { |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 495 | .pin_config_get = samsung_pinconf_get, |
| 496 | .pin_config_set = samsung_pinconf_set, |
| 497 | .pin_config_group_get = samsung_pinconf_group_get, |
| 498 | .pin_config_group_set = samsung_pinconf_group_set, |
| 499 | }; |
| 500 | |
| 501 | /* gpiolib gpio_set callback function */ |
| 502 | static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value) |
| 503 | { |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 504 | struct samsung_pin_bank *bank = gc_to_pin_bank(gc); |
Tomasz Figa | 499147c | 2013-03-18 22:31:52 +0100 | [diff] [blame^] | 505 | struct samsung_pin_bank_type *type = bank->type; |
Tomasz Figa | 1984695 | 2013-03-18 22:31:50 +0100 | [diff] [blame] | 506 | unsigned long flags; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 507 | void __iomem *reg; |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 508 | u32 data; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 509 | |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 510 | reg = bank->drvdata->virt_base + bank->pctl_offset; |
Tomasz Figa | 62f14c0 | 2012-10-11 10:11:08 +0200 | [diff] [blame] | 511 | |
Tomasz Figa | 1984695 | 2013-03-18 22:31:50 +0100 | [diff] [blame] | 512 | spin_lock_irqsave(&bank->slock, flags); |
| 513 | |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 514 | data = readl(reg + DAT_REG); |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 515 | data &= ~(1 << offset); |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 516 | if (value) |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 517 | data |= 1 << offset; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 518 | writel(data, reg + DAT_REG); |
Tomasz Figa | 1984695 | 2013-03-18 22:31:50 +0100 | [diff] [blame] | 519 | |
| 520 | spin_unlock_irqrestore(&bank->slock, flags); |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 521 | } |
| 522 | |
| 523 | /* gpiolib gpio_get callback function */ |
| 524 | static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset) |
| 525 | { |
| 526 | void __iomem *reg; |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 527 | u32 data; |
| 528 | struct samsung_pin_bank *bank = gc_to_pin_bank(gc); |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 529 | |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 530 | reg = bank->drvdata->virt_base + bank->pctl_offset; |
Tomasz Figa | 62f14c0 | 2012-10-11 10:11:08 +0200 | [diff] [blame] | 531 | |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 532 | data = readl(reg + DAT_REG); |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 533 | data >>= offset; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 534 | data &= 1; |
| 535 | return data; |
| 536 | } |
| 537 | |
| 538 | /* |
| 539 | * gpiolib gpio_direction_input callback function. The setting of the pin |
| 540 | * mux function as 'gpio input' will be handled by the pinctrl susbsystem |
| 541 | * interface. |
| 542 | */ |
| 543 | static int samsung_gpio_direction_input(struct gpio_chip *gc, unsigned offset) |
| 544 | { |
| 545 | return pinctrl_gpio_direction_input(gc->base + offset); |
| 546 | } |
| 547 | |
| 548 | /* |
| 549 | * gpiolib gpio_direction_output callback function. The setting of the pin |
| 550 | * mux function as 'gpio output' will be handled by the pinctrl susbsystem |
| 551 | * interface. |
| 552 | */ |
| 553 | static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset, |
| 554 | int value) |
| 555 | { |
| 556 | samsung_gpio_set(gc, offset, value); |
| 557 | return pinctrl_gpio_direction_output(gc->base + offset); |
| 558 | } |
| 559 | |
| 560 | /* |
Tomasz Figa | a19fe2d | 2012-10-11 10:11:20 +0200 | [diff] [blame] | 561 | * gpiolib gpio_to_irq callback function. Creates a mapping between a GPIO pin |
| 562 | * and a virtual IRQ, if not already present. |
| 563 | */ |
| 564 | static int samsung_gpio_to_irq(struct gpio_chip *gc, unsigned offset) |
| 565 | { |
| 566 | struct samsung_pin_bank *bank = gc_to_pin_bank(gc); |
| 567 | unsigned int virq; |
| 568 | |
| 569 | if (!bank->irq_domain) |
| 570 | return -ENXIO; |
| 571 | |
| 572 | virq = irq_create_mapping(bank->irq_domain, offset); |
| 573 | |
| 574 | return (virq) ? : -ENXIO; |
| 575 | } |
| 576 | |
| 577 | /* |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 578 | * Parse the pin names listed in the 'samsung,pins' property and convert it |
| 579 | * into a list of gpio numbers are create a pin group from it. |
| 580 | */ |
Greg Kroah-Hartman | 150632b | 2012-12-21 13:10:23 -0800 | [diff] [blame] | 581 | static int samsung_pinctrl_parse_dt_pins(struct platform_device *pdev, |
| 582 | struct device_node *cfg_np, |
| 583 | struct pinctrl_desc *pctl, |
| 584 | unsigned int **pin_list, |
| 585 | unsigned int *npins) |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 586 | { |
| 587 | struct device *dev = &pdev->dev; |
| 588 | struct property *prop; |
| 589 | struct pinctrl_pin_desc const *pdesc = pctl->pins; |
| 590 | unsigned int idx = 0, cnt; |
| 591 | const char *pin_name; |
| 592 | |
| 593 | *npins = of_property_count_strings(cfg_np, "samsung,pins"); |
Tushar Behera | 4a991b4 | 2012-11-19 09:45:19 +0900 | [diff] [blame] | 594 | if (IS_ERR_VALUE(*npins)) { |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 595 | dev_err(dev, "invalid pin list in %s node", cfg_np->name); |
| 596 | return -EINVAL; |
| 597 | } |
| 598 | |
| 599 | *pin_list = devm_kzalloc(dev, *npins * sizeof(**pin_list), GFP_KERNEL); |
| 600 | if (!*pin_list) { |
| 601 | dev_err(dev, "failed to allocate memory for pin list\n"); |
| 602 | return -ENOMEM; |
| 603 | } |
| 604 | |
| 605 | of_property_for_each_string(cfg_np, "samsung,pins", prop, pin_name) { |
| 606 | for (cnt = 0; cnt < pctl->npins; cnt++) { |
| 607 | if (pdesc[cnt].name) { |
| 608 | if (!strcmp(pin_name, pdesc[cnt].name)) { |
| 609 | (*pin_list)[idx++] = pdesc[cnt].number; |
| 610 | break; |
| 611 | } |
| 612 | } |
| 613 | } |
| 614 | if (cnt == pctl->npins) { |
| 615 | dev_err(dev, "pin %s not valid in %s node\n", |
| 616 | pin_name, cfg_np->name); |
| 617 | devm_kfree(dev, *pin_list); |
| 618 | return -EINVAL; |
| 619 | } |
| 620 | } |
| 621 | |
| 622 | return 0; |
| 623 | } |
| 624 | |
| 625 | /* |
| 626 | * Parse the information about all the available pin groups and pin functions |
| 627 | * from device node of the pin-controller. A pin group is formed with all |
| 628 | * the pins listed in the "samsung,pins" property. |
| 629 | */ |
Greg Kroah-Hartman | 150632b | 2012-12-21 13:10:23 -0800 | [diff] [blame] | 630 | static int samsung_pinctrl_parse_dt(struct platform_device *pdev, |
| 631 | struct samsung_pinctrl_drv_data *drvdata) |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 632 | { |
| 633 | struct device *dev = &pdev->dev; |
| 634 | struct device_node *dev_np = dev->of_node; |
| 635 | struct device_node *cfg_np; |
| 636 | struct samsung_pin_group *groups, *grp; |
| 637 | struct samsung_pmx_func *functions, *func; |
| 638 | unsigned *pin_list; |
| 639 | unsigned int npins, grp_cnt, func_idx = 0; |
| 640 | char *gname, *fname; |
| 641 | int ret; |
| 642 | |
| 643 | grp_cnt = of_get_child_count(dev_np); |
| 644 | if (!grp_cnt) |
| 645 | return -EINVAL; |
| 646 | |
| 647 | groups = devm_kzalloc(dev, grp_cnt * sizeof(*groups), GFP_KERNEL); |
| 648 | if (!groups) { |
| 649 | dev_err(dev, "failed allocate memory for ping group list\n"); |
| 650 | return -EINVAL; |
| 651 | } |
| 652 | grp = groups; |
| 653 | |
| 654 | functions = devm_kzalloc(dev, grp_cnt * sizeof(*functions), GFP_KERNEL); |
| 655 | if (!functions) { |
| 656 | dev_err(dev, "failed to allocate memory for function list\n"); |
| 657 | return -EINVAL; |
| 658 | } |
| 659 | func = functions; |
| 660 | |
| 661 | /* |
| 662 | * Iterate over all the child nodes of the pin controller node |
| 663 | * and create pin groups and pin function lists. |
| 664 | */ |
| 665 | for_each_child_of_node(dev_np, cfg_np) { |
| 666 | u32 function; |
Tomasz Figa | 724e56a | 2012-10-11 10:11:11 +0200 | [diff] [blame] | 667 | if (!of_find_property(cfg_np, "samsung,pins", NULL)) |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 668 | continue; |
| 669 | |
| 670 | ret = samsung_pinctrl_parse_dt_pins(pdev, cfg_np, |
| 671 | &drvdata->pctl, &pin_list, &npins); |
| 672 | if (ret) |
| 673 | return ret; |
| 674 | |
| 675 | /* derive pin group name from the node name */ |
| 676 | gname = devm_kzalloc(dev, strlen(cfg_np->name) + GSUFFIX_LEN, |
| 677 | GFP_KERNEL); |
| 678 | if (!gname) { |
| 679 | dev_err(dev, "failed to alloc memory for group name\n"); |
| 680 | return -ENOMEM; |
| 681 | } |
| 682 | sprintf(gname, "%s%s", cfg_np->name, GROUP_SUFFIX); |
| 683 | |
| 684 | grp->name = gname; |
| 685 | grp->pins = pin_list; |
| 686 | grp->num_pins = npins; |
| 687 | of_property_read_u32(cfg_np, "samsung,pin-function", &function); |
| 688 | grp->func = function; |
| 689 | grp++; |
| 690 | |
| 691 | if (!of_find_property(cfg_np, "samsung,pin-function", NULL)) |
| 692 | continue; |
| 693 | |
| 694 | /* derive function name from the node name */ |
| 695 | fname = devm_kzalloc(dev, strlen(cfg_np->name) + FSUFFIX_LEN, |
| 696 | GFP_KERNEL); |
| 697 | if (!fname) { |
| 698 | dev_err(dev, "failed to alloc memory for func name\n"); |
| 699 | return -ENOMEM; |
| 700 | } |
| 701 | sprintf(fname, "%s%s", cfg_np->name, FUNCTION_SUFFIX); |
| 702 | |
| 703 | func->name = fname; |
| 704 | func->groups = devm_kzalloc(dev, sizeof(char *), GFP_KERNEL); |
| 705 | if (!func->groups) { |
| 706 | dev_err(dev, "failed to alloc memory for group list " |
| 707 | "in pin function"); |
| 708 | return -ENOMEM; |
| 709 | } |
| 710 | func->groups[0] = gname; |
| 711 | func->num_groups = 1; |
| 712 | func++; |
| 713 | func_idx++; |
| 714 | } |
| 715 | |
| 716 | drvdata->pin_groups = groups; |
| 717 | drvdata->nr_groups = grp_cnt; |
| 718 | drvdata->pmx_functions = functions; |
| 719 | drvdata->nr_functions = func_idx; |
| 720 | |
| 721 | return 0; |
| 722 | } |
| 723 | |
| 724 | /* register the pinctrl interface with the pinctrl subsystem */ |
Greg Kroah-Hartman | 150632b | 2012-12-21 13:10:23 -0800 | [diff] [blame] | 725 | static int samsung_pinctrl_register(struct platform_device *pdev, |
| 726 | struct samsung_pinctrl_drv_data *drvdata) |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 727 | { |
| 728 | struct pinctrl_desc *ctrldesc = &drvdata->pctl; |
| 729 | struct pinctrl_pin_desc *pindesc, *pdesc; |
| 730 | struct samsung_pin_bank *pin_bank; |
| 731 | char *pin_names; |
| 732 | int pin, bank, ret; |
| 733 | |
| 734 | ctrldesc->name = "samsung-pinctrl"; |
| 735 | ctrldesc->owner = THIS_MODULE; |
| 736 | ctrldesc->pctlops = &samsung_pctrl_ops; |
| 737 | ctrldesc->pmxops = &samsung_pinmux_ops; |
| 738 | ctrldesc->confops = &samsung_pinconf_ops; |
| 739 | |
| 740 | pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) * |
| 741 | drvdata->ctrl->nr_pins, GFP_KERNEL); |
| 742 | if (!pindesc) { |
| 743 | dev_err(&pdev->dev, "mem alloc for pin descriptors failed\n"); |
| 744 | return -ENOMEM; |
| 745 | } |
| 746 | ctrldesc->pins = pindesc; |
| 747 | ctrldesc->npins = drvdata->ctrl->nr_pins; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 748 | |
| 749 | /* dynamically populate the pin number and pin name for pindesc */ |
| 750 | for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++) |
| 751 | pdesc->number = pin + drvdata->ctrl->base; |
| 752 | |
| 753 | /* |
| 754 | * allocate space for storing the dynamically generated names for all |
| 755 | * the pins which belong to this pin-controller. |
| 756 | */ |
| 757 | pin_names = devm_kzalloc(&pdev->dev, sizeof(char) * PIN_NAME_LENGTH * |
| 758 | drvdata->ctrl->nr_pins, GFP_KERNEL); |
| 759 | if (!pin_names) { |
| 760 | dev_err(&pdev->dev, "mem alloc for pin names failed\n"); |
| 761 | return -ENOMEM; |
| 762 | } |
| 763 | |
| 764 | /* for each pin, the name of the pin is pin-bank name + pin number */ |
| 765 | for (bank = 0; bank < drvdata->ctrl->nr_banks; bank++) { |
| 766 | pin_bank = &drvdata->ctrl->pin_banks[bank]; |
| 767 | for (pin = 0; pin < pin_bank->nr_pins; pin++) { |
| 768 | sprintf(pin_names, "%s-%d", pin_bank->name, pin); |
| 769 | pdesc = pindesc + pin_bank->pin_base + pin; |
| 770 | pdesc->name = pin_names; |
| 771 | pin_names += PIN_NAME_LENGTH; |
| 772 | } |
| 773 | } |
| 774 | |
| 775 | drvdata->pctl_dev = pinctrl_register(ctrldesc, &pdev->dev, drvdata); |
| 776 | if (!drvdata->pctl_dev) { |
| 777 | dev_err(&pdev->dev, "could not register pinctrl driver\n"); |
| 778 | return -EINVAL; |
| 779 | } |
| 780 | |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 781 | for (bank = 0; bank < drvdata->ctrl->nr_banks; ++bank) { |
| 782 | pin_bank = &drvdata->ctrl->pin_banks[bank]; |
| 783 | pin_bank->grange.name = pin_bank->name; |
| 784 | pin_bank->grange.id = bank; |
| 785 | pin_bank->grange.pin_base = pin_bank->pin_base; |
| 786 | pin_bank->grange.base = pin_bank->gpio_chip.base; |
| 787 | pin_bank->grange.npins = pin_bank->gpio_chip.ngpio; |
| 788 | pin_bank->grange.gc = &pin_bank->gpio_chip; |
| 789 | pinctrl_add_gpio_range(drvdata->pctl_dev, &pin_bank->grange); |
| 790 | } |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 791 | |
| 792 | ret = samsung_pinctrl_parse_dt(pdev, drvdata); |
| 793 | if (ret) { |
| 794 | pinctrl_unregister(drvdata->pctl_dev); |
| 795 | return ret; |
| 796 | } |
| 797 | |
| 798 | return 0; |
| 799 | } |
| 800 | |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 801 | static const struct gpio_chip samsung_gpiolib_chip = { |
| 802 | .set = samsung_gpio_set, |
| 803 | .get = samsung_gpio_get, |
| 804 | .direction_input = samsung_gpio_direction_input, |
| 805 | .direction_output = samsung_gpio_direction_output, |
Tomasz Figa | a19fe2d | 2012-10-11 10:11:20 +0200 | [diff] [blame] | 806 | .to_irq = samsung_gpio_to_irq, |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 807 | .owner = THIS_MODULE, |
| 808 | }; |
| 809 | |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 810 | /* register the gpiolib interface with the gpiolib subsystem */ |
Greg Kroah-Hartman | 150632b | 2012-12-21 13:10:23 -0800 | [diff] [blame] | 811 | static int samsung_gpiolib_register(struct platform_device *pdev, |
| 812 | struct samsung_pinctrl_drv_data *drvdata) |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 813 | { |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 814 | struct samsung_pin_ctrl *ctrl = drvdata->ctrl; |
| 815 | struct samsung_pin_bank *bank = ctrl->pin_banks; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 816 | struct gpio_chip *gc; |
| 817 | int ret; |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 818 | int i; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 819 | |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 820 | for (i = 0; i < ctrl->nr_banks; ++i, ++bank) { |
| 821 | bank->gpio_chip = samsung_gpiolib_chip; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 822 | |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 823 | gc = &bank->gpio_chip; |
| 824 | gc->base = ctrl->base + bank->pin_base; |
| 825 | gc->ngpio = bank->nr_pins; |
| 826 | gc->dev = &pdev->dev; |
| 827 | gc->of_node = bank->of_node; |
| 828 | gc->label = bank->name; |
| 829 | |
| 830 | ret = gpiochip_add(gc); |
| 831 | if (ret) { |
| 832 | dev_err(&pdev->dev, "failed to register gpio_chip %s, error code: %d\n", |
| 833 | gc->label, ret); |
| 834 | goto fail; |
| 835 | } |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 836 | } |
| 837 | |
| 838 | return 0; |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 839 | |
| 840 | fail: |
| 841 | for (--i, --bank; i >= 0; --i, --bank) |
| 842 | if (gpiochip_remove(&bank->gpio_chip)) |
| 843 | dev_err(&pdev->dev, "gpio chip %s remove failed\n", |
| 844 | bank->gpio_chip.label); |
| 845 | return ret; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 846 | } |
| 847 | |
| 848 | /* unregister the gpiolib interface with the gpiolib subsystem */ |
Greg Kroah-Hartman | 150632b | 2012-12-21 13:10:23 -0800 | [diff] [blame] | 849 | static int samsung_gpiolib_unregister(struct platform_device *pdev, |
| 850 | struct samsung_pinctrl_drv_data *drvdata) |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 851 | { |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 852 | struct samsung_pin_ctrl *ctrl = drvdata->ctrl; |
| 853 | struct samsung_pin_bank *bank = ctrl->pin_banks; |
| 854 | int ret = 0; |
| 855 | int i; |
| 856 | |
| 857 | for (i = 0; !ret && i < ctrl->nr_banks; ++i, ++bank) |
| 858 | ret = gpiochip_remove(&bank->gpio_chip); |
| 859 | |
| 860 | if (ret) |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 861 | dev_err(&pdev->dev, "gpio chip remove failed\n"); |
Tomasz Figa | d3a7b9e | 2012-10-11 10:11:17 +0200 | [diff] [blame] | 862 | |
| 863 | return ret; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 864 | } |
| 865 | |
| 866 | static const struct of_device_id samsung_pinctrl_dt_match[]; |
| 867 | |
| 868 | /* retrieve the soc specific data */ |
Tomasz Figa | 2f0253f | 2012-09-21 07:34:04 +0900 | [diff] [blame] | 869 | static struct samsung_pin_ctrl *samsung_pinctrl_get_soc_data( |
Tomasz Figa | 6defe9a | 2012-10-11 10:11:14 +0200 | [diff] [blame] | 870 | struct samsung_pinctrl_drv_data *d, |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 871 | struct platform_device *pdev) |
| 872 | { |
| 873 | int id; |
| 874 | const struct of_device_id *match; |
Tomasz Figa | 6defe9a | 2012-10-11 10:11:14 +0200 | [diff] [blame] | 875 | struct device_node *node = pdev->dev.of_node; |
Tomasz Figa | ab66378 | 2012-10-11 10:11:13 +0200 | [diff] [blame] | 876 | struct device_node *np; |
Tomasz Figa | 40ba622 | 2012-10-11 10:11:09 +0200 | [diff] [blame] | 877 | struct samsung_pin_ctrl *ctrl; |
| 878 | struct samsung_pin_bank *bank; |
| 879 | int i; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 880 | |
Tomasz Figa | 6defe9a | 2012-10-11 10:11:14 +0200 | [diff] [blame] | 881 | id = of_alias_get_id(node, "pinctrl"); |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 882 | if (id < 0) { |
| 883 | dev_err(&pdev->dev, "failed to get alias id\n"); |
| 884 | return NULL; |
| 885 | } |
| 886 | match = of_match_node(samsung_pinctrl_dt_match, node); |
Tomasz Figa | 40ba622 | 2012-10-11 10:11:09 +0200 | [diff] [blame] | 887 | ctrl = (struct samsung_pin_ctrl *)match->data + id; |
| 888 | |
| 889 | bank = ctrl->pin_banks; |
| 890 | for (i = 0; i < ctrl->nr_banks; ++i, ++bank) { |
Tomasz Figa | 1984695 | 2013-03-18 22:31:50 +0100 | [diff] [blame] | 891 | spin_lock_init(&bank->slock); |
Tomasz Figa | 6defe9a | 2012-10-11 10:11:14 +0200 | [diff] [blame] | 892 | bank->drvdata = d; |
Tomasz Figa | 40ba622 | 2012-10-11 10:11:09 +0200 | [diff] [blame] | 893 | bank->pin_base = ctrl->nr_pins; |
| 894 | ctrl->nr_pins += bank->nr_pins; |
Tomasz Figa | 40ba622 | 2012-10-11 10:11:09 +0200 | [diff] [blame] | 895 | } |
| 896 | |
Tomasz Figa | ab66378 | 2012-10-11 10:11:13 +0200 | [diff] [blame] | 897 | for_each_child_of_node(node, np) { |
| 898 | if (!of_find_property(np, "gpio-controller", NULL)) |
| 899 | continue; |
| 900 | bank = ctrl->pin_banks; |
| 901 | for (i = 0; i < ctrl->nr_banks; ++i, ++bank) { |
| 902 | if (!strcmp(bank->name, np->name)) { |
| 903 | bank->of_node = np; |
| 904 | break; |
| 905 | } |
| 906 | } |
| 907 | } |
| 908 | |
Tomasz Figa | 40ba622 | 2012-10-11 10:11:09 +0200 | [diff] [blame] | 909 | ctrl->base = pin_base; |
| 910 | pin_base += ctrl->nr_pins; |
| 911 | |
| 912 | return ctrl; |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 913 | } |
| 914 | |
Greg Kroah-Hartman | 150632b | 2012-12-21 13:10:23 -0800 | [diff] [blame] | 915 | static int samsung_pinctrl_probe(struct platform_device *pdev) |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 916 | { |
| 917 | struct samsung_pinctrl_drv_data *drvdata; |
| 918 | struct device *dev = &pdev->dev; |
| 919 | struct samsung_pin_ctrl *ctrl; |
| 920 | struct resource *res; |
| 921 | int ret; |
| 922 | |
| 923 | if (!dev->of_node) { |
| 924 | dev_err(dev, "device tree node not found\n"); |
| 925 | return -ENODEV; |
| 926 | } |
| 927 | |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 928 | drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); |
| 929 | if (!drvdata) { |
| 930 | dev_err(dev, "failed to allocate memory for driver's " |
| 931 | "private data\n"); |
| 932 | return -ENOMEM; |
| 933 | } |
Tomasz Figa | 6defe9a | 2012-10-11 10:11:14 +0200 | [diff] [blame] | 934 | |
| 935 | ctrl = samsung_pinctrl_get_soc_data(drvdata, pdev); |
| 936 | if (!ctrl) { |
| 937 | dev_err(&pdev->dev, "driver data not available\n"); |
| 938 | return -EINVAL; |
| 939 | } |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 940 | drvdata->ctrl = ctrl; |
| 941 | drvdata->dev = dev; |
| 942 | |
| 943 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 944 | if (!res) { |
| 945 | dev_err(dev, "cannot find IO resource\n"); |
| 946 | return -ENOENT; |
| 947 | } |
| 948 | |
Thierry Reding | 9e0c1fb | 2013-01-21 11:09:14 +0100 | [diff] [blame] | 949 | drvdata->virt_base = devm_ioremap_resource(&pdev->dev, res); |
| 950 | if (IS_ERR(drvdata->virt_base)) |
| 951 | return PTR_ERR(drvdata->virt_base); |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 952 | |
| 953 | res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
| 954 | if (res) |
| 955 | drvdata->irq = res->start; |
| 956 | |
| 957 | ret = samsung_gpiolib_register(pdev, drvdata); |
| 958 | if (ret) |
| 959 | return ret; |
| 960 | |
| 961 | ret = samsung_pinctrl_register(pdev, drvdata); |
| 962 | if (ret) { |
| 963 | samsung_gpiolib_unregister(pdev, drvdata); |
| 964 | return ret; |
| 965 | } |
| 966 | |
| 967 | if (ctrl->eint_gpio_init) |
| 968 | ctrl->eint_gpio_init(drvdata); |
| 969 | if (ctrl->eint_wkup_init) |
| 970 | ctrl->eint_wkup_init(drvdata); |
| 971 | |
| 972 | platform_set_drvdata(pdev, drvdata); |
| 973 | return 0; |
| 974 | } |
| 975 | |
| 976 | static const struct of_device_id samsung_pinctrl_dt_match[] = { |
Tomasz Figa | d5517be | 2013-03-18 22:31:51 +0100 | [diff] [blame] | 977 | #ifdef CONFIG_PINCTRL_EXYNOS |
Kukjin Kim | b533c86 | 2013-01-02 16:05:42 -0800 | [diff] [blame] | 978 | { .compatible = "samsung,exynos4210-pinctrl", |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 979 | .data = (void *)exynos4210_pin_ctrl }, |
Kukjin Kim | b533c86 | 2013-01-02 16:05:42 -0800 | [diff] [blame] | 980 | { .compatible = "samsung,exynos4x12-pinctrl", |
Tomasz Figa | 6edc794 | 2012-11-07 08:44:59 +0900 | [diff] [blame] | 981 | .data = (void *)exynos4x12_pin_ctrl }, |
Tomasz Figa | d5517be | 2013-03-18 22:31:51 +0100 | [diff] [blame] | 982 | #endif |
Thomas Abraham | 30574f0 | 2012-09-07 06:07:19 +0900 | [diff] [blame] | 983 | {}, |
| 984 | }; |
| 985 | MODULE_DEVICE_TABLE(of, samsung_pinctrl_dt_match); |
| 986 | |
| 987 | static struct platform_driver samsung_pinctrl_driver = { |
| 988 | .probe = samsung_pinctrl_probe, |
| 989 | .driver = { |
| 990 | .name = "samsung-pinctrl", |
| 991 | .owner = THIS_MODULE, |
| 992 | .of_match_table = of_match_ptr(samsung_pinctrl_dt_match), |
| 993 | }, |
| 994 | }; |
| 995 | |
| 996 | static int __init samsung_pinctrl_drv_register(void) |
| 997 | { |
| 998 | return platform_driver_register(&samsung_pinctrl_driver); |
| 999 | } |
| 1000 | postcore_initcall(samsung_pinctrl_drv_register); |
| 1001 | |
| 1002 | static void __exit samsung_pinctrl_drv_unregister(void) |
| 1003 | { |
| 1004 | platform_driver_unregister(&samsung_pinctrl_driver); |
| 1005 | } |
| 1006 | module_exit(samsung_pinctrl_drv_unregister); |
| 1007 | |
| 1008 | MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>"); |
| 1009 | MODULE_DESCRIPTION("Samsung pinctrl driver"); |
| 1010 | MODULE_LICENSE("GPL v2"); |