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> |
| 17 | #include <linux/io.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/of.h> |
| 20 | #include <linux/of_address.h> |
| 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 | |
| 31 | static inline u32 pmx_readl(struct spear_pmx *pmx, u32 reg) |
| 32 | { |
| 33 | return readl_relaxed(pmx->vbase + reg); |
| 34 | } |
| 35 | |
| 36 | static inline void pmx_writel(struct spear_pmx *pmx, u32 val, u32 reg) |
| 37 | { |
| 38 | writel_relaxed(val, pmx->vbase + reg); |
| 39 | } |
| 40 | |
| 41 | static int set_mode(struct spear_pmx *pmx, int mode) |
| 42 | { |
| 43 | struct spear_pmx_mode *pmx_mode = NULL; |
| 44 | int i; |
| 45 | u32 val; |
| 46 | |
| 47 | if (!pmx->machdata->pmx_modes || !pmx->machdata->npmx_modes) |
| 48 | return -EINVAL; |
| 49 | |
| 50 | for (i = 0; i < pmx->machdata->npmx_modes; i++) { |
| 51 | if (pmx->machdata->pmx_modes[i]->mode == (1 << mode)) { |
| 52 | pmx_mode = pmx->machdata->pmx_modes[i]; |
| 53 | break; |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | if (!pmx_mode) |
| 58 | return -EINVAL; |
| 59 | |
| 60 | val = pmx_readl(pmx, pmx_mode->reg); |
| 61 | val &= ~pmx_mode->mask; |
| 62 | val |= pmx_mode->val; |
| 63 | pmx_writel(pmx, val, pmx_mode->reg); |
| 64 | |
| 65 | pmx->machdata->mode = pmx_mode->mode; |
| 66 | dev_info(pmx->dev, "Configured Mode: %s with id: %x\n\n", |
| 67 | pmx_mode->name ? pmx_mode->name : "no_name", |
| 68 | pmx_mode->reg); |
| 69 | |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | void __devinit pmx_init_addr(struct spear_pinctrl_machdata *machdata, u16 reg) |
| 74 | { |
| 75 | struct spear_pingroup *pgroup; |
| 76 | struct spear_modemux *modemux; |
| 77 | int i, j, group; |
| 78 | |
| 79 | for (group = 0; group < machdata->ngroups; group++) { |
| 80 | pgroup = machdata->groups[group]; |
| 81 | |
| 82 | for (i = 0; i < pgroup->nmodemuxs; i++) { |
| 83 | modemux = &pgroup->modemuxs[i]; |
| 84 | |
| 85 | for (j = 0; j < modemux->nmuxregs; j++) |
| 86 | if (modemux->muxregs[j].reg == 0xFFFF) |
| 87 | modemux->muxregs[j].reg = reg; |
| 88 | } |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | static int spear_pinctrl_get_groups_cnt(struct pinctrl_dev *pctldev) |
| 93 | { |
| 94 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
| 95 | |
| 96 | return pmx->machdata->ngroups; |
| 97 | } |
| 98 | |
| 99 | static const char *spear_pinctrl_get_group_name(struct pinctrl_dev *pctldev, |
| 100 | unsigned group) |
| 101 | { |
| 102 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
| 103 | |
| 104 | return pmx->machdata->groups[group]->name; |
| 105 | } |
| 106 | |
| 107 | static int spear_pinctrl_get_group_pins(struct pinctrl_dev *pctldev, |
| 108 | unsigned group, const unsigned **pins, unsigned *num_pins) |
| 109 | { |
| 110 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
| 111 | |
| 112 | *pins = pmx->machdata->groups[group]->pins; |
| 113 | *num_pins = pmx->machdata->groups[group]->npins; |
| 114 | |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | static void spear_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev, |
| 119 | struct seq_file *s, unsigned offset) |
| 120 | { |
| 121 | seq_printf(s, " " DRIVER_NAME); |
| 122 | } |
| 123 | |
| 124 | int spear_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev, |
| 125 | struct device_node *np_config, |
| 126 | struct pinctrl_map **map, unsigned *num_maps) |
| 127 | { |
| 128 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
| 129 | struct device_node *np; |
| 130 | struct property *prop; |
| 131 | const char *function, *group; |
| 132 | int ret, index = 0, count = 0; |
| 133 | |
| 134 | /* calculate number of maps required */ |
| 135 | for_each_child_of_node(np_config, np) { |
| 136 | ret = of_property_read_string(np, "st,function", &function); |
| 137 | if (ret < 0) |
| 138 | return ret; |
| 139 | |
| 140 | ret = of_property_count_strings(np, "st,pins"); |
| 141 | if (ret < 0) |
| 142 | return ret; |
| 143 | |
| 144 | count += ret; |
| 145 | } |
| 146 | |
| 147 | if (!count) { |
| 148 | dev_err(pmx->dev, "No child nodes passed via DT\n"); |
| 149 | return -ENODEV; |
| 150 | } |
| 151 | |
| 152 | *map = kzalloc(sizeof(**map) * count, GFP_KERNEL); |
| 153 | if (!*map) |
| 154 | return -ENOMEM; |
| 155 | |
| 156 | for_each_child_of_node(np_config, np) { |
| 157 | of_property_read_string(np, "st,function", &function); |
| 158 | of_property_for_each_string(np, "st,pins", prop, group) { |
| 159 | (*map)[index].type = PIN_MAP_TYPE_MUX_GROUP; |
| 160 | (*map)[index].data.mux.group = group; |
| 161 | (*map)[index].data.mux.function = function; |
| 162 | index++; |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | *num_maps = count; |
| 167 | |
| 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | void spear_pinctrl_dt_free_map(struct pinctrl_dev *pctldev, |
| 172 | struct pinctrl_map *map, unsigned num_maps) |
| 173 | { |
| 174 | kfree(map); |
| 175 | } |
| 176 | |
| 177 | static struct pinctrl_ops spear_pinctrl_ops = { |
| 178 | .get_groups_count = spear_pinctrl_get_groups_cnt, |
| 179 | .get_group_name = spear_pinctrl_get_group_name, |
| 180 | .get_group_pins = spear_pinctrl_get_group_pins, |
| 181 | .pin_dbg_show = spear_pinctrl_pin_dbg_show, |
| 182 | .dt_node_to_map = spear_pinctrl_dt_node_to_map, |
| 183 | .dt_free_map = spear_pinctrl_dt_free_map, |
| 184 | }; |
| 185 | |
| 186 | static int spear_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev) |
| 187 | { |
| 188 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
| 189 | |
| 190 | return pmx->machdata->nfunctions; |
| 191 | } |
| 192 | |
| 193 | static const char *spear_pinctrl_get_func_name(struct pinctrl_dev *pctldev, |
| 194 | unsigned function) |
| 195 | { |
| 196 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
| 197 | |
| 198 | return pmx->machdata->functions[function]->name; |
| 199 | } |
| 200 | |
| 201 | static int spear_pinctrl_get_func_groups(struct pinctrl_dev *pctldev, |
| 202 | unsigned function, const char *const **groups, |
| 203 | unsigned * const ngroups) |
| 204 | { |
| 205 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
| 206 | |
| 207 | *groups = pmx->machdata->functions[function]->groups; |
| 208 | *ngroups = pmx->machdata->functions[function]->ngroups; |
| 209 | |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | static int spear_pinctrl_endisable(struct pinctrl_dev *pctldev, |
| 214 | unsigned function, unsigned group, bool enable) |
| 215 | { |
| 216 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); |
| 217 | const struct spear_pingroup *pgroup; |
| 218 | const struct spear_modemux *modemux; |
| 219 | struct spear_muxreg *muxreg; |
| 220 | u32 val, temp; |
| 221 | int i, j; |
| 222 | bool found = false; |
| 223 | |
| 224 | pgroup = pmx->machdata->groups[group]; |
| 225 | |
| 226 | for (i = 0; i < pgroup->nmodemuxs; i++) { |
| 227 | modemux = &pgroup->modemuxs[i]; |
| 228 | |
| 229 | /* SoC have any modes */ |
| 230 | if (pmx->machdata->modes_supported) { |
| 231 | if (!(pmx->machdata->mode & modemux->modes)) |
| 232 | continue; |
| 233 | } |
| 234 | |
| 235 | found = true; |
| 236 | for (j = 0; j < modemux->nmuxregs; j++) { |
| 237 | muxreg = &modemux->muxregs[j]; |
| 238 | |
| 239 | val = pmx_readl(pmx, muxreg->reg); |
| 240 | val &= ~muxreg->mask; |
| 241 | |
| 242 | if (enable) |
| 243 | temp = muxreg->val; |
| 244 | else |
| 245 | temp = ~muxreg->val; |
| 246 | |
Viresh Kumar | 0b53fa3 | 2012-10-27 14:47:46 +0530 | [diff] [blame] | 247 | val |= muxreg->mask & temp; |
Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 248 | pmx_writel(pmx, val, muxreg->reg); |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | if (!found) { |
| 253 | dev_err(pmx->dev, "pinmux group: %s not supported\n", |
| 254 | pgroup->name); |
| 255 | return -ENODEV; |
| 256 | } |
| 257 | |
| 258 | return 0; |
| 259 | } |
| 260 | |
| 261 | static int spear_pinctrl_enable(struct pinctrl_dev *pctldev, unsigned function, |
| 262 | unsigned group) |
| 263 | { |
| 264 | return spear_pinctrl_endisable(pctldev, function, group, true); |
| 265 | } |
| 266 | |
| 267 | static void spear_pinctrl_disable(struct pinctrl_dev *pctldev, |
| 268 | unsigned function, unsigned group) |
| 269 | { |
| 270 | spear_pinctrl_endisable(pctldev, function, group, false); |
| 271 | } |
| 272 | |
| 273 | static struct pinmux_ops spear_pinmux_ops = { |
| 274 | .get_functions_count = spear_pinctrl_get_funcs_count, |
| 275 | .get_function_name = spear_pinctrl_get_func_name, |
| 276 | .get_function_groups = spear_pinctrl_get_func_groups, |
| 277 | .enable = spear_pinctrl_enable, |
| 278 | .disable = spear_pinctrl_disable, |
| 279 | }; |
| 280 | |
| 281 | static struct pinctrl_desc spear_pinctrl_desc = { |
| 282 | .name = DRIVER_NAME, |
| 283 | .pctlops = &spear_pinctrl_ops, |
| 284 | .pmxops = &spear_pinmux_ops, |
| 285 | .owner = THIS_MODULE, |
| 286 | }; |
| 287 | |
| 288 | int __devinit spear_pinctrl_probe(struct platform_device *pdev, |
| 289 | struct spear_pinctrl_machdata *machdata) |
| 290 | { |
| 291 | struct device_node *np = pdev->dev.of_node; |
| 292 | struct resource *res; |
| 293 | struct spear_pmx *pmx; |
| 294 | |
| 295 | if (!machdata) |
| 296 | return -ENODEV; |
| 297 | |
| 298 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 299 | if (!res) |
| 300 | return -EINVAL; |
| 301 | |
| 302 | pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL); |
| 303 | if (!pmx) { |
| 304 | dev_err(&pdev->dev, "Can't alloc spear_pmx\n"); |
| 305 | return -ENOMEM; |
| 306 | } |
| 307 | |
| 308 | pmx->vbase = devm_ioremap(&pdev->dev, res->start, resource_size(res)); |
| 309 | if (!pmx->vbase) { |
| 310 | dev_err(&pdev->dev, "Couldn't ioremap at index 0\n"); |
| 311 | return -ENODEV; |
| 312 | } |
| 313 | |
| 314 | pmx->dev = &pdev->dev; |
| 315 | pmx->machdata = machdata; |
| 316 | |
| 317 | /* configure mode, if supported by SoC */ |
| 318 | if (machdata->modes_supported) { |
| 319 | int mode = 0; |
| 320 | |
| 321 | if (of_property_read_u32(np, "st,pinmux-mode", &mode)) { |
| 322 | dev_err(&pdev->dev, "OF: pinmux mode not passed\n"); |
| 323 | return -EINVAL; |
| 324 | } |
| 325 | |
| 326 | if (set_mode(pmx, mode)) { |
| 327 | dev_err(&pdev->dev, "OF: Couldn't configure mode: %x\n", |
| 328 | mode); |
| 329 | return -EINVAL; |
| 330 | } |
| 331 | } |
| 332 | |
| 333 | platform_set_drvdata(pdev, pmx); |
| 334 | |
| 335 | spear_pinctrl_desc.pins = machdata->pins; |
| 336 | spear_pinctrl_desc.npins = machdata->npins; |
| 337 | |
| 338 | pmx->pctl = pinctrl_register(&spear_pinctrl_desc, &pdev->dev, pmx); |
Devendra Naga | 8003ae3 | 2012-06-18 23:16:04 +0530 | [diff] [blame] | 339 | if (!pmx->pctl) { |
Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 340 | dev_err(&pdev->dev, "Couldn't register pinctrl driver\n"); |
Devendra Naga | 8003ae3 | 2012-06-18 23:16:04 +0530 | [diff] [blame] | 341 | return -ENODEV; |
Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 342 | } |
| 343 | |
| 344 | return 0; |
| 345 | } |
| 346 | |
Bill Pemberton | f90f54b | 2012-11-19 13:26:06 -0500 | [diff] [blame^] | 347 | int spear_pinctrl_remove(struct platform_device *pdev) |
Viresh Kumar | deda828 | 2012-03-28 22:27:07 +0530 | [diff] [blame] | 348 | { |
| 349 | struct spear_pmx *pmx = platform_get_drvdata(pdev); |
| 350 | |
| 351 | pinctrl_unregister(pmx->pctl); |
| 352 | |
| 353 | return 0; |
| 354 | } |