John Crispin | 3f8c50c | 2012-08-28 12:44:59 +0200 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/pinctrl/pinctrl-lantiq.c |
| 3 | * based on linux/drivers/pinctrl/pinctrl-pxa3xx.c |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * publishhed by the Free Software Foundation. |
| 8 | * |
| 9 | * Copyright (C) 2012 John Crispin <blogic@openwrt.org> |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/device.h> |
| 14 | #include <linux/io.h> |
| 15 | #include <linux/platform_device.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/of.h> |
| 18 | |
| 19 | #include "pinctrl-lantiq.h" |
| 20 | |
| 21 | static int ltq_get_group_count(struct pinctrl_dev *pctrldev) |
| 22 | { |
| 23 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev); |
| 24 | return info->num_grps; |
| 25 | } |
| 26 | |
| 27 | static const char *ltq_get_group_name(struct pinctrl_dev *pctrldev, |
| 28 | unsigned selector) |
| 29 | { |
| 30 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev); |
| 31 | if (selector >= info->num_grps) |
| 32 | return NULL; |
| 33 | return info->grps[selector].name; |
| 34 | } |
| 35 | |
| 36 | static int ltq_get_group_pins(struct pinctrl_dev *pctrldev, |
| 37 | unsigned selector, |
| 38 | const unsigned **pins, |
| 39 | unsigned *num_pins) |
| 40 | { |
| 41 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev); |
| 42 | if (selector >= info->num_grps) |
| 43 | return -EINVAL; |
| 44 | *pins = info->grps[selector].pins; |
| 45 | *num_pins = info->grps[selector].npins; |
| 46 | return 0; |
| 47 | } |
| 48 | |
Axel Lin | 89377aa | 2012-11-08 00:10:17 +0800 | [diff] [blame] | 49 | static void ltq_pinctrl_dt_free_map(struct pinctrl_dev *pctldev, |
| 50 | struct pinctrl_map *map, unsigned num_maps) |
John Crispin | 3f8c50c | 2012-08-28 12:44:59 +0200 | [diff] [blame] | 51 | { |
| 52 | int i; |
| 53 | |
| 54 | for (i = 0; i < num_maps; i++) |
| 55 | if (map[i].type == PIN_MAP_TYPE_CONFIGS_PIN) |
| 56 | kfree(map[i].data.configs.configs); |
| 57 | kfree(map); |
| 58 | } |
| 59 | |
| 60 | static void ltq_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev, |
| 61 | struct seq_file *s, |
| 62 | unsigned offset) |
| 63 | { |
| 64 | seq_printf(s, " %s", dev_name(pctldev->dev)); |
| 65 | } |
| 66 | |
John Crispin | 3a6b04c | 2013-02-01 13:04:57 +0100 | [diff] [blame] | 67 | static void ltq_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev, |
John Crispin | 3f8c50c | 2012-08-28 12:44:59 +0200 | [diff] [blame] | 68 | struct device_node *np, |
| 69 | struct pinctrl_map **map) |
| 70 | { |
| 71 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctldev); |
John Crispin | 3a6b04c | 2013-02-01 13:04:57 +0100 | [diff] [blame] | 72 | struct property *pins = of_find_property(np, "lantiq,pins", NULL); |
| 73 | struct property *groups = of_find_property(np, "lantiq,groups", NULL); |
John Crispin | 3f8c50c | 2012-08-28 12:44:59 +0200 | [diff] [blame] | 74 | unsigned long configs[3]; |
| 75 | unsigned num_configs = 0; |
| 76 | struct property *prop; |
| 77 | const char *group, *pin; |
| 78 | const char *function; |
| 79 | int ret, i; |
| 80 | |
John Crispin | 3a6b04c | 2013-02-01 13:04:57 +0100 | [diff] [blame] | 81 | if (!pins && !groups) { |
| 82 | dev_err(pctldev->dev, "%s defines neither pins nor groups\n", |
| 83 | np->name); |
| 84 | return; |
| 85 | } |
| 86 | |
| 87 | if (pins && groups) { |
| 88 | dev_err(pctldev->dev, "%s defines both pins and groups\n", |
| 89 | np->name); |
| 90 | return; |
| 91 | } |
| 92 | |
John Crispin | 3f8c50c | 2012-08-28 12:44:59 +0200 | [diff] [blame] | 93 | ret = of_property_read_string(np, "lantiq,function", &function); |
John Crispin | 3a6b04c | 2013-02-01 13:04:57 +0100 | [diff] [blame] | 94 | if (groups && !ret) { |
John Crispin | 3f8c50c | 2012-08-28 12:44:59 +0200 | [diff] [blame] | 95 | of_property_for_each_string(np, "lantiq,groups", prop, group) { |
| 96 | (*map)->type = PIN_MAP_TYPE_MUX_GROUP; |
| 97 | (*map)->name = function; |
| 98 | (*map)->data.mux.group = group; |
| 99 | (*map)->data.mux.function = function; |
| 100 | (*map)++; |
| 101 | } |
John Crispin | 3f8c50c | 2012-08-28 12:44:59 +0200 | [diff] [blame] | 102 | } |
| 103 | |
| 104 | for (i = 0; i < info->num_params; i++) { |
| 105 | u32 val; |
| 106 | int ret = of_property_read_u32(np, |
| 107 | info->params[i].property, &val); |
| 108 | if (!ret) |
| 109 | configs[num_configs++] = |
| 110 | LTQ_PINCONF_PACK(info->params[i].param, |
| 111 | val); |
| 112 | } |
| 113 | |
| 114 | if (!num_configs) |
John Crispin | 3a6b04c | 2013-02-01 13:04:57 +0100 | [diff] [blame] | 115 | return; |
John Crispin | 3f8c50c | 2012-08-28 12:44:59 +0200 | [diff] [blame] | 116 | |
| 117 | of_property_for_each_string(np, "lantiq,pins", prop, pin) { |
| 118 | (*map)->data.configs.configs = kmemdup(configs, |
| 119 | num_configs * sizeof(unsigned long), |
| 120 | GFP_KERNEL); |
| 121 | (*map)->type = PIN_MAP_TYPE_CONFIGS_PIN; |
| 122 | (*map)->name = pin; |
| 123 | (*map)->data.configs.group_or_pin = pin; |
| 124 | (*map)->data.configs.num_configs = num_configs; |
| 125 | (*map)++; |
| 126 | } |
John Crispin | 3a6b04c | 2013-02-01 13:04:57 +0100 | [diff] [blame] | 127 | of_property_for_each_string(np, "lantiq,groups", prop, group) { |
| 128 | (*map)->data.configs.configs = kmemdup(configs, |
| 129 | num_configs * sizeof(unsigned long), |
| 130 | GFP_KERNEL); |
| 131 | (*map)->type = PIN_MAP_TYPE_CONFIGS_GROUP; |
| 132 | (*map)->name = group; |
| 133 | (*map)->data.configs.group_or_pin = group; |
| 134 | (*map)->data.configs.num_configs = num_configs; |
| 135 | (*map)++; |
| 136 | } |
John Crispin | 3f8c50c | 2012-08-28 12:44:59 +0200 | [diff] [blame] | 137 | } |
| 138 | |
| 139 | static int ltq_pinctrl_dt_subnode_size(struct device_node *np) |
| 140 | { |
| 141 | int ret; |
| 142 | |
| 143 | ret = of_property_count_strings(np, "lantiq,groups"); |
| 144 | if (ret < 0) |
| 145 | ret = of_property_count_strings(np, "lantiq,pins"); |
| 146 | return ret; |
| 147 | } |
| 148 | |
Axel Lin | 89377aa | 2012-11-08 00:10:17 +0800 | [diff] [blame] | 149 | static int ltq_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev, |
| 150 | struct device_node *np_config, |
| 151 | struct pinctrl_map **map, |
| 152 | unsigned *num_maps) |
John Crispin | 3f8c50c | 2012-08-28 12:44:59 +0200 | [diff] [blame] | 153 | { |
| 154 | struct pinctrl_map *tmp; |
| 155 | struct device_node *np; |
John Crispin | 3a6b04c | 2013-02-01 13:04:57 +0100 | [diff] [blame] | 156 | int max_maps = 0; |
John Crispin | 3f8c50c | 2012-08-28 12:44:59 +0200 | [diff] [blame] | 157 | |
John Crispin | 3f8c50c | 2012-08-28 12:44:59 +0200 | [diff] [blame] | 158 | for_each_child_of_node(np_config, np) |
John Crispin | 3a6b04c | 2013-02-01 13:04:57 +0100 | [diff] [blame] | 159 | max_maps += ltq_pinctrl_dt_subnode_size(np); |
| 160 | *map = kzalloc(max_maps * sizeof(struct pinctrl_map) * 2, GFP_KERNEL); |
John Crispin | 3f8c50c | 2012-08-28 12:44:59 +0200 | [diff] [blame] | 161 | if (!*map) |
| 162 | return -ENOMEM; |
| 163 | tmp = *map; |
| 164 | |
John Crispin | 3a6b04c | 2013-02-01 13:04:57 +0100 | [diff] [blame] | 165 | for_each_child_of_node(np_config, np) |
| 166 | ltq_pinctrl_dt_subnode_to_map(pctldev, np, &tmp); |
| 167 | *num_maps = ((int)(tmp - *map)); |
| 168 | |
John Crispin | 3f8c50c | 2012-08-28 12:44:59 +0200 | [diff] [blame] | 169 | return 0; |
| 170 | } |
| 171 | |
Laurent Pinchart | 022ab14 | 2013-02-16 10:25:07 +0100 | [diff] [blame] | 172 | static const struct pinctrl_ops ltq_pctrl_ops = { |
John Crispin | 3f8c50c | 2012-08-28 12:44:59 +0200 | [diff] [blame] | 173 | .get_groups_count = ltq_get_group_count, |
| 174 | .get_group_name = ltq_get_group_name, |
| 175 | .get_group_pins = ltq_get_group_pins, |
| 176 | .pin_dbg_show = ltq_pinctrl_pin_dbg_show, |
| 177 | .dt_node_to_map = ltq_pinctrl_dt_node_to_map, |
| 178 | .dt_free_map = ltq_pinctrl_dt_free_map, |
| 179 | }; |
| 180 | |
| 181 | static int ltq_pmx_func_count(struct pinctrl_dev *pctrldev) |
| 182 | { |
| 183 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev); |
| 184 | |
| 185 | return info->num_funcs; |
| 186 | } |
| 187 | |
| 188 | static const char *ltq_pmx_func_name(struct pinctrl_dev *pctrldev, |
| 189 | unsigned selector) |
| 190 | { |
| 191 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev); |
| 192 | |
| 193 | if (selector >= info->num_funcs) |
| 194 | return NULL; |
| 195 | |
| 196 | return info->funcs[selector].name; |
| 197 | } |
| 198 | |
| 199 | static int ltq_pmx_get_groups(struct pinctrl_dev *pctrldev, |
| 200 | unsigned func, |
| 201 | const char * const **groups, |
| 202 | unsigned * const num_groups) |
| 203 | { |
| 204 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev); |
| 205 | |
| 206 | *groups = info->funcs[func].groups; |
| 207 | *num_groups = info->funcs[func].num_groups; |
| 208 | |
| 209 | return 0; |
| 210 | } |
| 211 | |
| 212 | /* Return function number. If failure, return negative value. */ |
| 213 | static int match_mux(const struct ltq_mfp_pin *mfp, unsigned mux) |
| 214 | { |
| 215 | int i; |
| 216 | for (i = 0; i < LTQ_MAX_MUX; i++) { |
| 217 | if (mfp->func[i] == mux) |
| 218 | break; |
| 219 | } |
| 220 | if (i >= LTQ_MAX_MUX) |
| 221 | return -EINVAL; |
| 222 | return i; |
| 223 | } |
| 224 | |
| 225 | /* dont assume .mfp is linearly mapped. find the mfp with the correct .pin */ |
| 226 | static int match_mfp(const struct ltq_pinmux_info *info, int pin) |
| 227 | { |
| 228 | int i; |
| 229 | for (i = 0; i < info->num_mfp; i++) { |
| 230 | if (info->mfp[i].pin == pin) |
| 231 | return i; |
| 232 | } |
| 233 | return -1; |
| 234 | } |
| 235 | |
| 236 | /* check whether current pin configuration is valid. Negative for failure */ |
| 237 | static int match_group_mux(const struct ltq_pin_group *grp, |
| 238 | const struct ltq_pinmux_info *info, |
| 239 | unsigned mux) |
| 240 | { |
| 241 | int i, pin, ret = 0; |
| 242 | for (i = 0; i < grp->npins; i++) { |
| 243 | pin = match_mfp(info, grp->pins[i]); |
| 244 | if (pin < 0) { |
| 245 | dev_err(info->dev, "could not find mfp for pin %d\n", |
| 246 | grp->pins[i]); |
| 247 | return -EINVAL; |
| 248 | } |
| 249 | ret = match_mux(&info->mfp[pin], mux); |
| 250 | if (ret < 0) { |
| 251 | dev_err(info->dev, "Can't find mux %d on pin%d\n", |
| 252 | mux, pin); |
| 253 | break; |
| 254 | } |
| 255 | } |
| 256 | return ret; |
| 257 | } |
| 258 | |
| 259 | static int ltq_pmx_enable(struct pinctrl_dev *pctrldev, |
| 260 | unsigned func, |
| 261 | unsigned group) |
| 262 | { |
| 263 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev); |
| 264 | const struct ltq_pin_group *pin_grp = &info->grps[group]; |
| 265 | int i, pin, pin_func, ret; |
| 266 | |
| 267 | if (!pin_grp->npins || |
| 268 | (match_group_mux(pin_grp, info, pin_grp->mux) < 0)) { |
| 269 | dev_err(info->dev, "Failed to set the pin group: %s\n", |
| 270 | info->grps[group].name); |
| 271 | return -EINVAL; |
| 272 | } |
| 273 | for (i = 0; i < pin_grp->npins; i++) { |
| 274 | pin = match_mfp(info, pin_grp->pins[i]); |
| 275 | if (pin < 0) { |
| 276 | dev_err(info->dev, "could not find mfp for pin %d\n", |
| 277 | pin_grp->pins[i]); |
| 278 | return -EINVAL; |
| 279 | } |
| 280 | pin_func = match_mux(&info->mfp[pin], pin_grp->mux); |
| 281 | ret = info->apply_mux(pctrldev, pin, pin_func); |
| 282 | if (ret) { |
| 283 | dev_err(info->dev, |
| 284 | "failed to apply mux %d for pin %d\n", |
| 285 | pin_func, pin); |
| 286 | return ret; |
| 287 | } |
| 288 | } |
| 289 | return 0; |
| 290 | } |
| 291 | |
John Crispin | 3f8c50c | 2012-08-28 12:44:59 +0200 | [diff] [blame] | 292 | static int ltq_pmx_gpio_request_enable(struct pinctrl_dev *pctrldev, |
| 293 | struct pinctrl_gpio_range *range, |
| 294 | unsigned pin) |
| 295 | { |
| 296 | struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev); |
John Crispin | d8a7c1f | 2013-02-01 13:05:05 +0100 | [diff] [blame] | 297 | int mfp = match_mfp(info, pin); |
John Crispin | 3f8c50c | 2012-08-28 12:44:59 +0200 | [diff] [blame] | 298 | int pin_func; |
| 299 | |
| 300 | if (mfp < 0) { |
| 301 | dev_err(info->dev, "could not find mfp for pin %d\n", pin); |
| 302 | return -EINVAL; |
| 303 | } |
| 304 | |
| 305 | pin_func = match_mux(&info->mfp[mfp], 0); |
| 306 | if (pin_func < 0) { |
| 307 | dev_err(info->dev, "No GPIO function on pin%d\n", mfp); |
| 308 | return -EINVAL; |
| 309 | } |
| 310 | |
| 311 | return info->apply_mux(pctrldev, mfp, pin_func); |
| 312 | } |
| 313 | |
Laurent Pinchart | 022ab14 | 2013-02-16 10:25:07 +0100 | [diff] [blame] | 314 | static const struct pinmux_ops ltq_pmx_ops = { |
John Crispin | 3f8c50c | 2012-08-28 12:44:59 +0200 | [diff] [blame] | 315 | .get_functions_count = ltq_pmx_func_count, |
| 316 | .get_function_name = ltq_pmx_func_name, |
| 317 | .get_function_groups = ltq_pmx_get_groups, |
| 318 | .enable = ltq_pmx_enable, |
John Crispin | 3f8c50c | 2012-08-28 12:44:59 +0200 | [diff] [blame] | 319 | .gpio_request_enable = ltq_pmx_gpio_request_enable, |
| 320 | }; |
| 321 | |
| 322 | /* |
| 323 | * allow different socs to register with the generic part of the lanti |
| 324 | * pinctrl code |
| 325 | */ |
| 326 | int ltq_pinctrl_register(struct platform_device *pdev, |
| 327 | struct ltq_pinmux_info *info) |
| 328 | { |
| 329 | struct pinctrl_desc *desc; |
| 330 | |
| 331 | if (!info) |
| 332 | return -EINVAL; |
| 333 | desc = info->desc; |
| 334 | desc->pctlops = <q_pctrl_ops; |
| 335 | desc->pmxops = <q_pmx_ops; |
| 336 | info->dev = &pdev->dev; |
| 337 | |
| 338 | info->pctrl = pinctrl_register(desc, &pdev->dev, info); |
| 339 | if (!info->pctrl) { |
| 340 | dev_err(&pdev->dev, "failed to register LTQ pinmux driver\n"); |
| 341 | return -EINVAL; |
| 342 | } |
| 343 | platform_set_drvdata(pdev, info); |
| 344 | return 0; |
| 345 | } |