1 | /* |
2 | * Driver for the ST Microelectronics SPEAr pinmux |
3 | * |
4 | * Copyright (C) 2012 ST Microelectronics |
5 | * Viresh Kumar <vireshk@kernel.org> |
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/mfd/syscon.h> |
18 | #include <linux/module.h> |
19 | #include <linux/of.h> |
20 | #include <linux/of_address.h> |
21 | #include <linux/platform_device.h> |
22 | #include <linux/seq_file.h> |
23 | #include <linux/slab.h> |
24 | |
25 | #include <linux/pinctrl/machine.h> |
26 | #include <linux/pinctrl/pinctrl.h> |
27 | #include <linux/pinctrl/pinmux.h> |
28 | |
29 | #include "pinctrl-spear.h" |
30 | |
31 | #define DRIVER_NAME "spear-pinmux" |
32 | |
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, reg: 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, reg: muxreg->reg); |
52 | } |
53 | } |
54 | |
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, reg: pmx_mode->reg); |
75 | val &= ~pmx_mode->mask; |
76 | val |= pmx_mode->val; |
77 | pmx_writel(pmx, val, reg: 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 | |
87 | void pmx_init_gpio_pingroup_addr(struct spear_gpio_pingroup *gpio_pingroup, |
88 | unsigned count, u16 reg) |
89 | { |
90 | int i, j; |
91 | |
92 | for (i = 0; i < count; i++) |
93 | for (j = 0; j < gpio_pingroup[i].nmuxregs; j++) |
94 | gpio_pingroup[i].muxregs[j].reg = reg; |
95 | } |
96 | |
97 | void pmx_init_addr(struct spear_pinctrl_machdata *machdata, u16 reg) |
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(m: s, fmt: " " DRIVER_NAME); |
146 | } |
147 | |
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) |
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, propname: "st,function" , out_string: &function); |
162 | if (ret < 0) { |
163 | of_node_put(node: np); |
164 | return ret; |
165 | } |
166 | |
167 | ret = of_property_count_strings(np, propname: "st,pins" ); |
168 | if (ret < 0) { |
169 | of_node_put(node: np); |
170 | return ret; |
171 | } |
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 | |
181 | *map = kcalloc(n: count, size: sizeof(**map), GFP_KERNEL); |
182 | if (!*map) |
183 | return -ENOMEM; |
184 | |
185 | for_each_child_of_node(np_config, np) { |
186 | of_property_read_string(np, propname: "st,function" , out_string: &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 | |
200 | static void spear_pinctrl_dt_free_map(struct pinctrl_dev *pctldev, |
201 | struct pinctrl_map *map, |
202 | unsigned num_maps) |
203 | { |
204 | kfree(objp: map); |
205 | } |
206 | |
207 | static const struct pinctrl_ops spear_pinctrl_ops = { |
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; |
249 | int i; |
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; |
264 | muxregs_endisable(pmx, muxregs: modemux->muxregs, count: modemux->nmuxregs, |
265 | enable); |
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 | |
277 | static int spear_pinctrl_set_mux(struct pinctrl_dev *pctldev, unsigned function, |
278 | unsigned group) |
279 | { |
280 | return spear_pinctrl_endisable(pctldev, function, group, enable: true); |
281 | } |
282 | |
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; |
288 | int i, j; |
289 | |
290 | if (!pmx->machdata->gpio_pingroups) |
291 | return NULL; |
292 | |
293 | for (i = 0; i < pmx->machdata->ngpio_pingroups; i++) { |
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 | |
302 | return NULL; |
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); |
309 | struct spear_pinctrl_machdata *machdata = pmx->machdata; |
310 | struct spear_gpio_pingroup *gpio_pingroup; |
311 | |
312 | /* |
313 | * Some SoC have configuration options applicable to group of pins, |
314 | * rather than a single pin. |
315 | */ |
316 | gpio_pingroup = get_gpio_pingroup(pmx, pin: offset); |
317 | if (gpio_pingroup) |
318 | muxregs_endisable(pmx, muxregs: gpio_pingroup->muxregs, |
319 | count: gpio_pingroup->nmuxregs, enable); |
320 | |
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 | |
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, enable: 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, enable: false); |
341 | } |
342 | |
343 | static const 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 | .set_mux = spear_pinctrl_set_mux, |
348 | .gpio_request_enable = gpio_request_enable, |
349 | .gpio_disable_free = gpio_disable_free, |
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 | |
359 | int spear_pinctrl_probe(struct platform_device *pdev, |
360 | struct spear_pinctrl_machdata *machdata) |
361 | { |
362 | struct device_node *np = pdev->dev.of_node; |
363 | struct spear_pmx *pmx; |
364 | |
365 | if (!machdata) |
366 | return -ENODEV; |
367 | |
368 | pmx = devm_kzalloc(dev: &pdev->dev, size: sizeof(*pmx), GFP_KERNEL); |
369 | if (!pmx) |
370 | return -ENOMEM; |
371 | |
372 | pmx->regmap = device_node_to_regmap(np); |
373 | if (IS_ERR(ptr: pmx->regmap)) { |
374 | dev_err(&pdev->dev, "Init regmap failed (%pe).\n" , |
375 | pmx->regmap); |
376 | return PTR_ERR(ptr: pmx->regmap); |
377 | } |
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, propname: "st,pinmux-mode" , out_value: &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, data: pmx); |
399 | |
400 | spear_pinctrl_desc.pins = machdata->pins; |
401 | spear_pinctrl_desc.npins = machdata->npins; |
402 | |
403 | pmx->pctl = devm_pinctrl_register(dev: &pdev->dev, pctldesc: &spear_pinctrl_desc, driver_data: pmx); |
404 | if (IS_ERR(ptr: pmx->pctl)) { |
405 | dev_err(&pdev->dev, "Couldn't register pinctrl driver\n" ); |
406 | return PTR_ERR(ptr: pmx->pctl); |
407 | } |
408 | |
409 | return 0; |
410 | } |
411 | |