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deda8287 VK |
1 | /* |
2 | * Driver for the ST Microelectronics SPEAr pinmux | |
3 | * | |
4 | * Copyright (C) 2012 ST Microelectronics | |
da89947b | 5 | * Viresh Kumar <vireshk@kernel.org> |
deda8287 VK |
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> | |
d11db044 | 17 | #include <linux/mfd/syscon.h> |
deda8287 VK |
18 | #include <linux/module.h> |
19 | #include <linux/of.h> | |
20 | #include <linux/of_address.h> | |
f993216d AS |
21 | #include <linux/platform_device.h> |
22 | #include <linux/seq_file.h> | |
23 | #include <linux/slab.h> | |
24 | ||
deda8287 VK |
25 | #include <linux/pinctrl/machine.h> |
26 | #include <linux/pinctrl/pinctrl.h> | |
27 | #include <linux/pinctrl/pinmux.h> | |
deda8287 VK |
28 | |
29 | #include "pinctrl-spear.h" | |
30 | ||
31 | #define DRIVER_NAME "spear-pinmux" | |
32 | ||
f4f8e563 VK |
33 | static void muxregs_endisable(struct spear_pmx *pmx, |
34 | struct spear_muxreg *muxregs, u8 count, bool enable) | |
35 | { | |
36 | struct spear_muxreg *muxreg; | |
37 | u32 val, temp, j; | |
38 | ||
39 | for (j = 0; j < count; j++) { | |
40 | muxreg = &muxregs[j]; | |
41 | ||
42 | val = pmx_readl(pmx, muxreg->reg); | |
43 | val &= ~muxreg->mask; | |
44 | ||
45 | if (enable) | |
46 | temp = muxreg->val; | |
47 | else | |
48 | temp = ~muxreg->val; | |
49 | ||
50 | val |= muxreg->mask & temp; | |
51 | pmx_writel(pmx, val, muxreg->reg); | |
52 | } | |
53 | } | |
54 | ||
deda8287 VK |
55 | static int set_mode(struct spear_pmx *pmx, int mode) |
56 | { | |
57 | struct spear_pmx_mode *pmx_mode = NULL; | |
58 | int i; | |
59 | u32 val; | |
60 | ||
61 | if (!pmx->machdata->pmx_modes || !pmx->machdata->npmx_modes) | |
62 | return -EINVAL; | |
63 | ||
64 | for (i = 0; i < pmx->machdata->npmx_modes; i++) { | |
65 | if (pmx->machdata->pmx_modes[i]->mode == (1 << mode)) { | |
66 | pmx_mode = pmx->machdata->pmx_modes[i]; | |
67 | break; | |
68 | } | |
69 | } | |
70 | ||
71 | if (!pmx_mode) | |
72 | return -EINVAL; | |
73 | ||
74 | val = pmx_readl(pmx, pmx_mode->reg); | |
75 | val &= ~pmx_mode->mask; | |
76 | val |= pmx_mode->val; | |
77 | pmx_writel(pmx, val, pmx_mode->reg); | |
78 | ||
79 | pmx->machdata->mode = pmx_mode->mode; | |
80 | dev_info(pmx->dev, "Configured Mode: %s with id: %x\n\n", | |
81 | pmx_mode->name ? pmx_mode->name : "no_name", | |
82 | pmx_mode->reg); | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
150632b0 GKH |
87 | void pmx_init_gpio_pingroup_addr(struct spear_gpio_pingroup *gpio_pingroup, |
88 | unsigned count, u16 reg) | |
f4f8e563 | 89 | { |
4484d0b1 | 90 | int i, j; |
f4f8e563 | 91 | |
4484d0b1 AL |
92 | for (i = 0; i < count; i++) |
93 | for (j = 0; j < gpio_pingroup[i].nmuxregs; j++) | |
f4f8e563 VK |
94 | gpio_pingroup[i].muxregs[j].reg = reg; |
95 | } | |
96 | ||
150632b0 | 97 | void pmx_init_addr(struct spear_pinctrl_machdata *machdata, u16 reg) |
deda8287 VK |
98 | { |
99 | struct spear_pingroup *pgroup; | |
100 | struct spear_modemux *modemux; | |
101 | int i, j, group; | |
102 | ||
103 | for (group = 0; group < machdata->ngroups; group++) { | |
104 | pgroup = machdata->groups[group]; | |
105 | ||
106 | for (i = 0; i < pgroup->nmodemuxs; i++) { | |
107 | modemux = &pgroup->modemuxs[i]; | |
108 | ||
109 | for (j = 0; j < modemux->nmuxregs; j++) | |
110 | if (modemux->muxregs[j].reg == 0xFFFF) | |
111 | modemux->muxregs[j].reg = reg; | |
112 | } | |
113 | } | |
114 | } | |
115 | ||
116 | static int spear_pinctrl_get_groups_cnt(struct pinctrl_dev *pctldev) | |
117 | { | |
118 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); | |
119 | ||
120 | return pmx->machdata->ngroups; | |
121 | } | |
122 | ||
123 | static const char *spear_pinctrl_get_group_name(struct pinctrl_dev *pctldev, | |
124 | unsigned group) | |
125 | { | |
126 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); | |
127 | ||
128 | return pmx->machdata->groups[group]->name; | |
129 | } | |
130 | ||
131 | static int spear_pinctrl_get_group_pins(struct pinctrl_dev *pctldev, | |
132 | unsigned group, const unsigned **pins, unsigned *num_pins) | |
133 | { | |
134 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); | |
135 | ||
136 | *pins = pmx->machdata->groups[group]->pins; | |
137 | *num_pins = pmx->machdata->groups[group]->npins; | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | static void spear_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev, | |
143 | struct seq_file *s, unsigned offset) | |
144 | { | |
145 | seq_printf(s, " " DRIVER_NAME); | |
146 | } | |
147 | ||
9b2b1740 AL |
148 | static int spear_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev, |
149 | struct device_node *np_config, | |
150 | struct pinctrl_map **map, | |
151 | unsigned *num_maps) | |
deda8287 VK |
152 | { |
153 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); | |
154 | struct device_node *np; | |
155 | struct property *prop; | |
156 | const char *function, *group; | |
157 | int ret, index = 0, count = 0; | |
158 | ||
159 | /* calculate number of maps required */ | |
160 | for_each_child_of_node(np_config, np) { | |
161 | ret = of_property_read_string(np, "st,function", &function); | |
8df92d67 ND |
162 | if (ret < 0) { |
163 | of_node_put(np); | |
deda8287 | 164 | return ret; |
8df92d67 | 165 | } |
deda8287 VK |
166 | |
167 | ret = of_property_count_strings(np, "st,pins"); | |
8df92d67 ND |
168 | if (ret < 0) { |
169 | of_node_put(np); | |
deda8287 | 170 | return ret; |
8df92d67 | 171 | } |
deda8287 VK |
172 | |
173 | count += ret; | |
174 | } | |
175 | ||
176 | if (!count) { | |
177 | dev_err(pmx->dev, "No child nodes passed via DT\n"); | |
178 | return -ENODEV; | |
179 | } | |
180 | ||
6396bb22 | 181 | *map = kcalloc(count, sizeof(**map), GFP_KERNEL); |
deda8287 VK |
182 | if (!*map) |
183 | return -ENOMEM; | |
184 | ||
185 | for_each_child_of_node(np_config, np) { | |
186 | of_property_read_string(np, "st,function", &function); | |
187 | of_property_for_each_string(np, "st,pins", prop, group) { | |
188 | (*map)[index].type = PIN_MAP_TYPE_MUX_GROUP; | |
189 | (*map)[index].data.mux.group = group; | |
190 | (*map)[index].data.mux.function = function; | |
191 | index++; | |
192 | } | |
193 | } | |
194 | ||
195 | *num_maps = count; | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
9b2b1740 AL |
200 | static void spear_pinctrl_dt_free_map(struct pinctrl_dev *pctldev, |
201 | struct pinctrl_map *map, | |
202 | unsigned num_maps) | |
deda8287 VK |
203 | { |
204 | kfree(map); | |
205 | } | |
206 | ||
022ab148 | 207 | static const struct pinctrl_ops spear_pinctrl_ops = { |
deda8287 VK |
208 | .get_groups_count = spear_pinctrl_get_groups_cnt, |
209 | .get_group_name = spear_pinctrl_get_group_name, | |
210 | .get_group_pins = spear_pinctrl_get_group_pins, | |
211 | .pin_dbg_show = spear_pinctrl_pin_dbg_show, | |
212 | .dt_node_to_map = spear_pinctrl_dt_node_to_map, | |
213 | .dt_free_map = spear_pinctrl_dt_free_map, | |
214 | }; | |
215 | ||
216 | static int spear_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev) | |
217 | { | |
218 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); | |
219 | ||
220 | return pmx->machdata->nfunctions; | |
221 | } | |
222 | ||
223 | static const char *spear_pinctrl_get_func_name(struct pinctrl_dev *pctldev, | |
224 | unsigned function) | |
225 | { | |
226 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); | |
227 | ||
228 | return pmx->machdata->functions[function]->name; | |
229 | } | |
230 | ||
231 | static int spear_pinctrl_get_func_groups(struct pinctrl_dev *pctldev, | |
232 | unsigned function, const char *const **groups, | |
233 | unsigned * const ngroups) | |
234 | { | |
235 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); | |
236 | ||
237 | *groups = pmx->machdata->functions[function]->groups; | |
238 | *ngroups = pmx->machdata->functions[function]->ngroups; | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | static int spear_pinctrl_endisable(struct pinctrl_dev *pctldev, | |
244 | unsigned function, unsigned group, bool enable) | |
245 | { | |
246 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); | |
247 | const struct spear_pingroup *pgroup; | |
248 | const struct spear_modemux *modemux; | |
f4f8e563 | 249 | int i; |
deda8287 VK |
250 | bool found = false; |
251 | ||
252 | pgroup = pmx->machdata->groups[group]; | |
253 | ||
254 | for (i = 0; i < pgroup->nmodemuxs; i++) { | |
255 | modemux = &pgroup->modemuxs[i]; | |
256 | ||
257 | /* SoC have any modes */ | |
258 | if (pmx->machdata->modes_supported) { | |
259 | if (!(pmx->machdata->mode & modemux->modes)) | |
260 | continue; | |
261 | } | |
262 | ||
263 | found = true; | |
f4f8e563 VK |
264 | muxregs_endisable(pmx, modemux->muxregs, modemux->nmuxregs, |
265 | enable); | |
deda8287 VK |
266 | } |
267 | ||
268 | if (!found) { | |
269 | dev_err(pmx->dev, "pinmux group: %s not supported\n", | |
270 | pgroup->name); | |
271 | return -ENODEV; | |
272 | } | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
03e9f0ca | 277 | static int spear_pinctrl_set_mux(struct pinctrl_dev *pctldev, unsigned function, |
deda8287 VK |
278 | unsigned group) |
279 | { | |
280 | return spear_pinctrl_endisable(pctldev, function, group, true); | |
281 | } | |
282 | ||
f4f8e563 VK |
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; | |
6f37b1b4 | 288 | int i, j; |
f4f8e563 VK |
289 | |
290 | if (!pmx->machdata->gpio_pingroups) | |
291 | return NULL; | |
292 | ||
6f37b1b4 | 293 | for (i = 0; i < pmx->machdata->ngpio_pingroups; i++) { |
f4f8e563 VK |
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 | ||
6f37b1b4 | 302 | return NULL; |
f4f8e563 VK |
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); | |
826d6ca8 | 309 | struct spear_pinctrl_machdata *machdata = pmx->machdata; |
f4f8e563 VK |
310 | struct spear_gpio_pingroup *gpio_pingroup; |
311 | ||
826d6ca8 SH |
312 | /* |
313 | * Some SoC have configuration options applicable to group of pins, | |
314 | * rather than a single pin. | |
315 | */ | |
f4f8e563 | 316 | gpio_pingroup = get_gpio_pingroup(pmx, offset); |
f4f8e563 VK |
317 | if (gpio_pingroup) |
318 | muxregs_endisable(pmx, gpio_pingroup->muxregs, | |
319 | gpio_pingroup->nmuxregs, enable); | |
320 | ||
826d6ca8 SH |
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 | ||
f4f8e563 VK |
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 | ||
022ab148 | 343 | static const struct pinmux_ops spear_pinmux_ops = { |
deda8287 VK |
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, | |
03e9f0ca | 347 | .set_mux = spear_pinctrl_set_mux, |
f4f8e563 VK |
348 | .gpio_request_enable = gpio_request_enable, |
349 | .gpio_disable_free = gpio_disable_free, | |
deda8287 VK |
350 | }; |
351 | ||
352 | static struct pinctrl_desc spear_pinctrl_desc = { | |
353 | .name = DRIVER_NAME, | |
354 | .pctlops = &spear_pinctrl_ops, | |
355 | .pmxops = &spear_pinmux_ops, | |
356 | .owner = THIS_MODULE, | |
357 | }; | |
358 | ||
150632b0 GKH |
359 | int spear_pinctrl_probe(struct platform_device *pdev, |
360 | struct spear_pinctrl_machdata *machdata) | |
deda8287 VK |
361 | { |
362 | struct device_node *np = pdev->dev.of_node; | |
deda8287 VK |
363 | struct spear_pmx *pmx; |
364 | ||
365 | if (!machdata) | |
366 | return -ENODEV; | |
367 | ||
deda8287 | 368 | pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL); |
51d7a036 | 369 | if (!pmx) |
deda8287 | 370 | return -ENOMEM; |
deda8287 | 371 | |
d11db044 HC |
372 | pmx->regmap = device_node_to_regmap(np); |
373 | if (IS_ERR(pmx->regmap)) { | |
374 | dev_err(&pdev->dev, "Init regmap failed (%pe).\n", | |
375 | pmx->regmap); | |
376 | return PTR_ERR(pmx->regmap); | |
377 | } | |
deda8287 VK |
378 | |
379 | pmx->dev = &pdev->dev; | |
380 | pmx->machdata = machdata; | |
381 | ||
382 | /* configure mode, if supported by SoC */ | |
383 | if (machdata->modes_supported) { | |
384 | int mode = 0; | |
385 | ||
386 | if (of_property_read_u32(np, "st,pinmux-mode", &mode)) { | |
387 | dev_err(&pdev->dev, "OF: pinmux mode not passed\n"); | |
388 | return -EINVAL; | |
389 | } | |
390 | ||
391 | if (set_mode(pmx, mode)) { | |
392 | dev_err(&pdev->dev, "OF: Couldn't configure mode: %x\n", | |
393 | mode); | |
394 | return -EINVAL; | |
395 | } | |
396 | } | |
397 | ||
398 | platform_set_drvdata(pdev, pmx); | |
399 | ||
400 | spear_pinctrl_desc.pins = machdata->pins; | |
401 | spear_pinctrl_desc.npins = machdata->npins; | |
402 | ||
d39de313 | 403 | pmx->pctl = devm_pinctrl_register(&pdev->dev, &spear_pinctrl_desc, pmx); |
323de9ef | 404 | if (IS_ERR(pmx->pctl)) { |
deda8287 | 405 | dev_err(&pdev->dev, "Couldn't register pinctrl driver\n"); |
323de9ef | 406 | return PTR_ERR(pmx->pctl); |
deda8287 VK |
407 | } |
408 | ||
409 | return 0; | |
410 | } |