Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Driver for the ST Microelectronics SPEAr pinmux |
| 3 | * |
| 4 | * Copyright (C) 2012 ST Microelectronics |
Viresh Kumar | 10d8935 | 2012-06-20 12:53:02 -0700 | [diff] [blame] | 5 | * Viresh Kumar <viresh.linux@gmail.com> |
Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 6 | * |
| 7 | * Inspired from: |
| 8 | * - U300 Pinctl drivers |
| 9 | * - Tegra Pinctl drivers |
| 10 | * |
| 11 | * This file is licensed under the terms of the GNU General Public |
| 12 | * License version 2. This program is licensed "as is" without any |
| 13 | * warranty of any kind, whether express or implied. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/err.h> |
Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 17 | #include <linux/module.h> |
| 18 | #include <linux/of.h> |
| 19 | #include <linux/of_address.h> |
Viresh Kumar | f4f8e56 | 2012-10-27 15:21:38 +0530 | [diff] [blame] | 20 | #include <linux/of_gpio.h> |
Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 21 | #include <linux/pinctrl/machine.h> |
| 22 | #include <linux/pinctrl/pinctrl.h> |
| 23 | #include <linux/pinctrl/pinmux.h> |
| 24 | #include <linux/platform_device.h> |
| 25 | #include <linux/slab.h> |
| 26 | |
| 27 | #include "pinctrl-spear.h" |
| 28 | |
| 29 | #define DRIVER_NAME "spear-pinmux" |
| 30 | |
Viresh Kumar | f4f8e56 | 2012-10-27 15:21:38 +0530 | [diff] [blame] | 31 | static void muxregs_endisable(struct spear_pmx *pmx, |
| 32 | struct spear_muxreg *muxregs, u8 count, bool enable) |
| 33 | { |
| 34 | struct spear_muxreg *muxreg; |
| 35 | u32 val, temp, j; |
| 36 | |
| 37 | for (j = 0; j < count; j++) { |
| 38 | muxreg = &muxregs[j]; |
| 39 | |
| 40 | val = pmx_readl(pmx, muxreg->reg); |
| 41 | val &= ~muxreg->mask; |
| 42 | |
| 43 | if (enable) |
| 44 | temp = muxreg->val; |
| 45 | else |
| 46 | temp = ~muxreg->val; |
| 47 | |
| 48 | val |= muxreg->mask & temp; |
| 49 | pmx_writel(pmx, val, muxreg->reg); |
| 50 | } |
| 51 | } |
| 52 | |
Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 53 | static int set_mode(struct spear_pmx *pmx, int mode) |
| 54 | { |
| 55 | struct spear_pmx_mode *pmx_mode = NULL; |
| 56 | int i; |
| 57 | u32 val; |
| 58 | |
| 59 | if (!pmx->machdata->pmx_modes || !pmx->machdata->npmx_modes) |
| 60 | return -EINVAL; |
| 61 | |
| 62 | for (i = 0; i < pmx->machdata->npmx_modes; i++) { |
| 63 | if (pmx->machdata->pmx_modes[i]->mode == (1 << mode)) { |
| 64 | pmx_mode = pmx->machdata->pmx_modes[i]; |
| 65 | break; |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | if (!pmx_mode) |
| 70 | return -EINVAL; |
| 71 | |
| 72 | val = pmx_readl(pmx, pmx_mode->reg); |
| 73 | val &= ~pmx_mode->mask; |
| 74 | val |= pmx_mode->val; |
| 75 | pmx_writel(pmx, val, pmx_mode->reg); |
| 76 | |
| 77 | pmx->machdata->mode = pmx_mode->mode; |
| 78 | dev_info(pmx->dev, "Configured Mode: %s with id: %x\n\n", |
| 79 | pmx_mode->name ? pmx_mode->name : "no_name", |
| 80 | pmx_mode->reg); |
| 81 | |
| 82 | return 0; |
| 83 | } |
| 84 | |
Greg Kroah-Hartman | 150632b | 2012-12-21 13:10:23 -0800 | [diff] [blame] | 85 | void pmx_init_gpio_pingroup_addr(struct spear_gpio_pingroup *gpio_pingroup, |
| 86 | unsigned count, u16 reg) |
Viresh Kumar | f4f8e56 | 2012-10-27 15:21:38 +0530 | [diff] [blame] | 87 | { |
Axel Lin | 4484d0b | 2012-11-13 15:31:41 +0800 | [diff] [blame] | 88 | int i, j; |
Viresh Kumar | f4f8e56 | 2012-10-27 15:21:38 +0530 | [diff] [blame] | 89 | |
Axel Lin | 4484d0b | 2012-11-13 15:31:41 +0800 | [diff] [blame] | 90 | for (i = 0; i < count; i++) |
| 91 | for (j = 0; j < gpio_pingroup[i].nmuxregs; j++) |
Viresh Kumar | f4f8e56 | 2012-10-27 15:21:38 +0530 | [diff] [blame] | 92 | gpio_pingroup[i].muxregs[j].reg = reg; |
| 93 | } |
| 94 | |
Greg Kroah-Hartman | 150632b | 2012-12-21 13:10:23 -0800 | [diff] [blame] | 95 | void pmx_init_addr(struct spear_pinctrl_machdata *machdata, u16 reg) |
Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 96 | { |
| 97 | struct spear_pingroup *pgroup; |
| 98 | struct spear_modemux *modemux; |
| 99 | int i, j, group; |
| 100 | |
| 101 | for (group = 0; group < machdata->ngroups; group++) { |
| 102 | pgroup = machdata->groups[group]; |
| 103 | |
| 104 | for (i = 0; i < pgroup->nmodemuxs; i++) { |
| 105 | modemux = &pgroup->modemuxs[i]; |
| 106 | |
| 107 | for (j = 0; j < modemux->nmuxregs; j++) |
| 108 | if (modemux->muxregs[j].reg == 0xFFFF) |
| 109 | modemux->muxregs[j].reg = reg; |
| 110 | } |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | static int spear_pinctrl_get_groups_cnt(struct pinctrl_dev *pctldev) |
| 115 | { |
| 116 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
| 117 | |
| 118 | return pmx->machdata->ngroups; |
| 119 | } |
| 120 | |
| 121 | static const char *spear_pinctrl_get_group_name(struct pinctrl_dev *pctldev, |
| 122 | unsigned group) |
| 123 | { |
| 124 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
| 125 | |
| 126 | return pmx->machdata->groups[group]->name; |
| 127 | } |
| 128 | |
| 129 | static int spear_pinctrl_get_group_pins(struct pinctrl_dev *pctldev, |
| 130 | unsigned group, const unsigned **pins, unsigned *num_pins) |
| 131 | { |
| 132 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
| 133 | |
| 134 | *pins = pmx->machdata->groups[group]->pins; |
| 135 | *num_pins = pmx->machdata->groups[group]->npins; |
| 136 | |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | static void spear_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev, |
| 141 | struct seq_file *s, unsigned offset) |
| 142 | { |
| 143 | seq_printf(s, " " DRIVER_NAME); |
| 144 | } |
| 145 | |
Axel Lin | 9b2b174 | 2012-11-11 10:29:40 +0800 | [diff] [blame] | 146 | static int spear_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev, |
| 147 | struct device_node *np_config, |
| 148 | struct pinctrl_map **map, |
| 149 | unsigned *num_maps) |
Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 150 | { |
| 151 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
| 152 | struct device_node *np; |
| 153 | struct property *prop; |
| 154 | const char *function, *group; |
| 155 | int ret, index = 0, count = 0; |
| 156 | |
| 157 | /* calculate number of maps required */ |
| 158 | for_each_child_of_node(np_config, np) { |
| 159 | ret = of_property_read_string(np, "st,function", &function); |
| 160 | if (ret < 0) |
| 161 | return ret; |
| 162 | |
| 163 | ret = of_property_count_strings(np, "st,pins"); |
| 164 | if (ret < 0) |
| 165 | return ret; |
| 166 | |
| 167 | count += ret; |
| 168 | } |
| 169 | |
| 170 | if (!count) { |
| 171 | dev_err(pmx->dev, "No child nodes passed via DT\n"); |
| 172 | return -ENODEV; |
| 173 | } |
| 174 | |
| 175 | *map = kzalloc(sizeof(**map) * count, GFP_KERNEL); |
| 176 | if (!*map) |
| 177 | return -ENOMEM; |
| 178 | |
| 179 | for_each_child_of_node(np_config, np) { |
| 180 | of_property_read_string(np, "st,function", &function); |
| 181 | of_property_for_each_string(np, "st,pins", prop, group) { |
| 182 | (*map)[index].type = PIN_MAP_TYPE_MUX_GROUP; |
| 183 | (*map)[index].data.mux.group = group; |
| 184 | (*map)[index].data.mux.function = function; |
| 185 | index++; |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | *num_maps = count; |
| 190 | |
| 191 | return 0; |
| 192 | } |
| 193 | |
Axel Lin | 9b2b174 | 2012-11-11 10:29:40 +0800 | [diff] [blame] | 194 | static void spear_pinctrl_dt_free_map(struct pinctrl_dev *pctldev, |
| 195 | struct pinctrl_map *map, |
| 196 | unsigned num_maps) |
Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 197 | { |
| 198 | kfree(map); |
| 199 | } |
| 200 | |
| 201 | static struct pinctrl_ops spear_pinctrl_ops = { |
| 202 | .get_groups_count = spear_pinctrl_get_groups_cnt, |
| 203 | .get_group_name = spear_pinctrl_get_group_name, |
| 204 | .get_group_pins = spear_pinctrl_get_group_pins, |
| 205 | .pin_dbg_show = spear_pinctrl_pin_dbg_show, |
| 206 | .dt_node_to_map = spear_pinctrl_dt_node_to_map, |
| 207 | .dt_free_map = spear_pinctrl_dt_free_map, |
| 208 | }; |
| 209 | |
| 210 | static int spear_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev) |
| 211 | { |
| 212 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
| 213 | |
| 214 | return pmx->machdata->nfunctions; |
| 215 | } |
| 216 | |
| 217 | static const char *spear_pinctrl_get_func_name(struct pinctrl_dev *pctldev, |
| 218 | unsigned function) |
| 219 | { |
| 220 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
| 221 | |
| 222 | return pmx->machdata->functions[function]->name; |
| 223 | } |
| 224 | |
| 225 | static int spear_pinctrl_get_func_groups(struct pinctrl_dev *pctldev, |
| 226 | unsigned function, const char *const **groups, |
| 227 | unsigned * const ngroups) |
| 228 | { |
| 229 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
| 230 | |
| 231 | *groups = pmx->machdata->functions[function]->groups; |
| 232 | *ngroups = pmx->machdata->functions[function]->ngroups; |
| 233 | |
| 234 | return 0; |
| 235 | } |
| 236 | |
| 237 | static int spear_pinctrl_endisable(struct pinctrl_dev *pctldev, |
| 238 | unsigned function, unsigned group, bool enable) |
| 239 | { |
| 240 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
| 241 | const struct spear_pingroup *pgroup; |
| 242 | const struct spear_modemux *modemux; |
Viresh Kumar | f4f8e56 | 2012-10-27 15:21:38 +0530 | [diff] [blame] | 243 | int i; |
Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 244 | bool found = false; |
| 245 | |
| 246 | pgroup = pmx->machdata->groups[group]; |
| 247 | |
| 248 | for (i = 0; i < pgroup->nmodemuxs; i++) { |
| 249 | modemux = &pgroup->modemuxs[i]; |
| 250 | |
| 251 | /* SoC have any modes */ |
| 252 | if (pmx->machdata->modes_supported) { |
| 253 | if (!(pmx->machdata->mode & modemux->modes)) |
| 254 | continue; |
| 255 | } |
| 256 | |
| 257 | found = true; |
Viresh Kumar | f4f8e56 | 2012-10-27 15:21:38 +0530 | [diff] [blame] | 258 | muxregs_endisable(pmx, modemux->muxregs, modemux->nmuxregs, |
| 259 | enable); |
Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 260 | } |
| 261 | |
| 262 | if (!found) { |
| 263 | dev_err(pmx->dev, "pinmux group: %s not supported\n", |
| 264 | pgroup->name); |
| 265 | return -ENODEV; |
| 266 | } |
| 267 | |
| 268 | return 0; |
| 269 | } |
| 270 | |
| 271 | static int spear_pinctrl_enable(struct pinctrl_dev *pctldev, unsigned function, |
| 272 | unsigned group) |
| 273 | { |
| 274 | return spear_pinctrl_endisable(pctldev, function, group, true); |
| 275 | } |
| 276 | |
| 277 | static void spear_pinctrl_disable(struct pinctrl_dev *pctldev, |
| 278 | unsigned function, unsigned group) |
| 279 | { |
| 280 | spear_pinctrl_endisable(pctldev, function, group, false); |
| 281 | } |
| 282 | |
Viresh Kumar | f4f8e56 | 2012-10-27 15:21:38 +0530 | [diff] [blame] | 283 | /* gpio with pinmux */ |
| 284 | static struct spear_gpio_pingroup *get_gpio_pingroup(struct spear_pmx *pmx, |
| 285 | unsigned pin) |
| 286 | { |
| 287 | struct spear_gpio_pingroup *gpio_pingroup; |
Axel Lin | 6f37b1b | 2012-11-13 20:20:50 +0800 | [diff] [blame] | 288 | int i, j; |
Viresh Kumar | f4f8e56 | 2012-10-27 15:21:38 +0530 | [diff] [blame] | 289 | |
| 290 | if (!pmx->machdata->gpio_pingroups) |
| 291 | return NULL; |
| 292 | |
Axel Lin | 6f37b1b | 2012-11-13 20:20:50 +0800 | [diff] [blame] | 293 | for (i = 0; i < pmx->machdata->ngpio_pingroups; i++) { |
Viresh Kumar | f4f8e56 | 2012-10-27 15:21:38 +0530 | [diff] [blame] | 294 | gpio_pingroup = &pmx->machdata->gpio_pingroups[i]; |
| 295 | |
| 296 | for (j = 0; j < gpio_pingroup->npins; j++) { |
| 297 | if (gpio_pingroup->pins[j] == pin) |
| 298 | return gpio_pingroup; |
| 299 | } |
| 300 | } |
| 301 | |
Axel Lin | 6f37b1b | 2012-11-13 20:20:50 +0800 | [diff] [blame] | 302 | return NULL; |
Viresh Kumar | f4f8e56 | 2012-10-27 15:21:38 +0530 | [diff] [blame] | 303 | } |
| 304 | |
| 305 | static int gpio_request_endisable(struct pinctrl_dev *pctldev, |
| 306 | struct pinctrl_gpio_range *range, unsigned offset, bool enable) |
| 307 | { |
| 308 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
Shiraz Hashim | 826d6ca | 2012-11-07 20:07:25 +0530 | [diff] [blame] | 309 | struct spear_pinctrl_machdata *machdata = pmx->machdata; |
Viresh Kumar | f4f8e56 | 2012-10-27 15:21:38 +0530 | [diff] [blame] | 310 | struct spear_gpio_pingroup *gpio_pingroup; |
| 311 | |
Shiraz Hashim | 826d6ca | 2012-11-07 20:07:25 +0530 | [diff] [blame] | 312 | /* |
| 313 | * Some SoC have configuration options applicable to group of pins, |
| 314 | * rather than a single pin. |
| 315 | */ |
Viresh Kumar | f4f8e56 | 2012-10-27 15:21:38 +0530 | [diff] [blame] | 316 | gpio_pingroup = get_gpio_pingroup(pmx, offset); |
Viresh Kumar | f4f8e56 | 2012-10-27 15:21:38 +0530 | [diff] [blame] | 317 | if (gpio_pingroup) |
| 318 | muxregs_endisable(pmx, gpio_pingroup->muxregs, |
| 319 | gpio_pingroup->nmuxregs, enable); |
| 320 | |
Shiraz Hashim | 826d6ca | 2012-11-07 20:07:25 +0530 | [diff] [blame] | 321 | /* |
| 322 | * SoC may need some extra configurations, or configurations for single |
| 323 | * pin |
| 324 | */ |
| 325 | if (machdata->gpio_request_endisable) |
| 326 | machdata->gpio_request_endisable(pmx, offset, enable); |
| 327 | |
Viresh Kumar | f4f8e56 | 2012-10-27 15:21:38 +0530 | [diff] [blame] | 328 | return 0; |
| 329 | } |
| 330 | |
| 331 | static int gpio_request_enable(struct pinctrl_dev *pctldev, |
| 332 | struct pinctrl_gpio_range *range, unsigned offset) |
| 333 | { |
| 334 | return gpio_request_endisable(pctldev, range, offset, true); |
| 335 | } |
| 336 | |
| 337 | static void gpio_disable_free(struct pinctrl_dev *pctldev, |
| 338 | struct pinctrl_gpio_range *range, unsigned offset) |
| 339 | { |
| 340 | gpio_request_endisable(pctldev, range, offset, false); |
| 341 | } |
| 342 | |
Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 343 | static struct pinmux_ops spear_pinmux_ops = { |
| 344 | .get_functions_count = spear_pinctrl_get_funcs_count, |
| 345 | .get_function_name = spear_pinctrl_get_func_name, |
| 346 | .get_function_groups = spear_pinctrl_get_func_groups, |
| 347 | .enable = spear_pinctrl_enable, |
| 348 | .disable = spear_pinctrl_disable, |
Viresh Kumar | f4f8e56 | 2012-10-27 15:21:38 +0530 | [diff] [blame] | 349 | .gpio_request_enable = gpio_request_enable, |
| 350 | .gpio_disable_free = gpio_disable_free, |
Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 351 | }; |
| 352 | |
| 353 | static struct pinctrl_desc spear_pinctrl_desc = { |
| 354 | .name = DRIVER_NAME, |
| 355 | .pctlops = &spear_pinctrl_ops, |
| 356 | .pmxops = &spear_pinmux_ops, |
| 357 | .owner = THIS_MODULE, |
| 358 | }; |
| 359 | |
Greg Kroah-Hartman | 150632b | 2012-12-21 13:10:23 -0800 | [diff] [blame] | 360 | int spear_pinctrl_probe(struct platform_device *pdev, |
| 361 | struct spear_pinctrl_machdata *machdata) |
Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 362 | { |
| 363 | struct device_node *np = pdev->dev.of_node; |
| 364 | struct resource *res; |
| 365 | struct spear_pmx *pmx; |
| 366 | |
| 367 | if (!machdata) |
| 368 | return -ENODEV; |
| 369 | |
| 370 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 371 | if (!res) |
| 372 | return -EINVAL; |
| 373 | |
| 374 | pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL); |
| 375 | if (!pmx) { |
| 376 | dev_err(&pdev->dev, "Can't alloc spear_pmx\n"); |
| 377 | return -ENOMEM; |
| 378 | } |
| 379 | |
| 380 | pmx->vbase = devm_ioremap(&pdev->dev, res->start, resource_size(res)); |
| 381 | if (!pmx->vbase) { |
| 382 | dev_err(&pdev->dev, "Couldn't ioremap at index 0\n"); |
| 383 | return -ENODEV; |
| 384 | } |
| 385 | |
| 386 | pmx->dev = &pdev->dev; |
| 387 | pmx->machdata = machdata; |
| 388 | |
| 389 | /* configure mode, if supported by SoC */ |
| 390 | if (machdata->modes_supported) { |
| 391 | int mode = 0; |
| 392 | |
| 393 | if (of_property_read_u32(np, "st,pinmux-mode", &mode)) { |
| 394 | dev_err(&pdev->dev, "OF: pinmux mode not passed\n"); |
| 395 | return -EINVAL; |
| 396 | } |
| 397 | |
| 398 | if (set_mode(pmx, mode)) { |
| 399 | dev_err(&pdev->dev, "OF: Couldn't configure mode: %x\n", |
| 400 | mode); |
| 401 | return -EINVAL; |
| 402 | } |
| 403 | } |
| 404 | |
| 405 | platform_set_drvdata(pdev, pmx); |
| 406 | |
| 407 | spear_pinctrl_desc.pins = machdata->pins; |
| 408 | spear_pinctrl_desc.npins = machdata->npins; |
| 409 | |
| 410 | pmx->pctl = pinctrl_register(&spear_pinctrl_desc, &pdev->dev, pmx); |
Devendra Naga | 8003ae3 | 2012-06-18 23:16:04 +0530 | [diff] [blame] | 411 | if (!pmx->pctl) { |
Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 412 | dev_err(&pdev->dev, "Couldn't register pinctrl driver\n"); |
Devendra Naga | 8003ae3 | 2012-06-18 23:16:04 +0530 | [diff] [blame] | 413 | return -ENODEV; |
Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 414 | } |
| 415 | |
| 416 | return 0; |
| 417 | } |
| 418 | |
Bill Pemberton | f90f54b | 2012-11-19 13:26:06 -0500 | [diff] [blame] | 419 | int spear_pinctrl_remove(struct platform_device *pdev) |
Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 420 | { |
| 421 | struct spear_pmx *pmx = platform_get_drvdata(pdev); |
| 422 | |
| 423 | pinctrl_unregister(pmx->pctl); |
| 424 | |
| 425 | return 0; |
| 426 | } |