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deda8287 VK |
1 | /* |
2 | * Driver for the ST Microelectronics SPEAr pinmux | |
3 | * | |
4 | * Copyright (C) 2012 ST Microelectronics | |
10d8935f | 5 | * Viresh Kumar <viresh.linux@gmail.com> |
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> | |
deda8287 VK |
17 | #include <linux/module.h> |
18 | #include <linux/of.h> | |
19 | #include <linux/of_address.h> | |
f4f8e563 | 20 | #include <linux/of_gpio.h> |
deda8287 VK |
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 | ||
f4f8e563 VK |
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 | ||
deda8287 VK |
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 | ||
f4f8e563 VK |
85 | void __devinit |
86 | pmx_init_gpio_pingroup_addr(struct spear_gpio_pingroup *gpio_pingroup, | |
87 | unsigned count, u16 reg) | |
88 | { | |
4484d0b1 | 89 | int i, j; |
f4f8e563 | 90 | |
4484d0b1 AL |
91 | for (i = 0; i < count; i++) |
92 | for (j = 0; j < gpio_pingroup[i].nmuxregs; j++) | |
f4f8e563 VK |
93 | gpio_pingroup[i].muxregs[j].reg = reg; |
94 | } | |
95 | ||
deda8287 VK |
96 | void __devinit pmx_init_addr(struct spear_pinctrl_machdata *machdata, u16 reg) |
97 | { | |
98 | struct spear_pingroup *pgroup; | |
99 | struct spear_modemux *modemux; | |
100 | int i, j, group; | |
101 | ||
102 | for (group = 0; group < machdata->ngroups; group++) { | |
103 | pgroup = machdata->groups[group]; | |
104 | ||
105 | for (i = 0; i < pgroup->nmodemuxs; i++) { | |
106 | modemux = &pgroup->modemuxs[i]; | |
107 | ||
108 | for (j = 0; j < modemux->nmuxregs; j++) | |
109 | if (modemux->muxregs[j].reg == 0xFFFF) | |
110 | modemux->muxregs[j].reg = reg; | |
111 | } | |
112 | } | |
113 | } | |
114 | ||
115 | static int spear_pinctrl_get_groups_cnt(struct pinctrl_dev *pctldev) | |
116 | { | |
117 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); | |
118 | ||
119 | return pmx->machdata->ngroups; | |
120 | } | |
121 | ||
122 | static const char *spear_pinctrl_get_group_name(struct pinctrl_dev *pctldev, | |
123 | unsigned group) | |
124 | { | |
125 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); | |
126 | ||
127 | return pmx->machdata->groups[group]->name; | |
128 | } | |
129 | ||
130 | static int spear_pinctrl_get_group_pins(struct pinctrl_dev *pctldev, | |
131 | unsigned group, const unsigned **pins, unsigned *num_pins) | |
132 | { | |
133 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); | |
134 | ||
135 | *pins = pmx->machdata->groups[group]->pins; | |
136 | *num_pins = pmx->machdata->groups[group]->npins; | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
141 | static void spear_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev, | |
142 | struct seq_file *s, unsigned offset) | |
143 | { | |
144 | seq_printf(s, " " DRIVER_NAME); | |
145 | } | |
146 | ||
9b2b1740 AL |
147 | static int spear_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev, |
148 | struct device_node *np_config, | |
149 | struct pinctrl_map **map, | |
150 | unsigned *num_maps) | |
deda8287 VK |
151 | { |
152 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); | |
153 | struct device_node *np; | |
154 | struct property *prop; | |
155 | const char *function, *group; | |
156 | int ret, index = 0, count = 0; | |
157 | ||
158 | /* calculate number of maps required */ | |
159 | for_each_child_of_node(np_config, np) { | |
160 | ret = of_property_read_string(np, "st,function", &function); | |
161 | if (ret < 0) | |
162 | return ret; | |
163 | ||
164 | ret = of_property_count_strings(np, "st,pins"); | |
165 | if (ret < 0) | |
166 | return ret; | |
167 | ||
168 | count += ret; | |
169 | } | |
170 | ||
171 | if (!count) { | |
172 | dev_err(pmx->dev, "No child nodes passed via DT\n"); | |
173 | return -ENODEV; | |
174 | } | |
175 | ||
176 | *map = kzalloc(sizeof(**map) * count, GFP_KERNEL); | |
177 | if (!*map) | |
178 | return -ENOMEM; | |
179 | ||
180 | for_each_child_of_node(np_config, np) { | |
181 | of_property_read_string(np, "st,function", &function); | |
182 | of_property_for_each_string(np, "st,pins", prop, group) { | |
183 | (*map)[index].type = PIN_MAP_TYPE_MUX_GROUP; | |
184 | (*map)[index].data.mux.group = group; | |
185 | (*map)[index].data.mux.function = function; | |
186 | index++; | |
187 | } | |
188 | } | |
189 | ||
190 | *num_maps = count; | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
9b2b1740 AL |
195 | static void spear_pinctrl_dt_free_map(struct pinctrl_dev *pctldev, |
196 | struct pinctrl_map *map, | |
197 | unsigned num_maps) | |
deda8287 VK |
198 | { |
199 | kfree(map); | |
200 | } | |
201 | ||
202 | static struct pinctrl_ops spear_pinctrl_ops = { | |
203 | .get_groups_count = spear_pinctrl_get_groups_cnt, | |
204 | .get_group_name = spear_pinctrl_get_group_name, | |
205 | .get_group_pins = spear_pinctrl_get_group_pins, | |
206 | .pin_dbg_show = spear_pinctrl_pin_dbg_show, | |
207 | .dt_node_to_map = spear_pinctrl_dt_node_to_map, | |
208 | .dt_free_map = spear_pinctrl_dt_free_map, | |
209 | }; | |
210 | ||
211 | static int spear_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev) | |
212 | { | |
213 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); | |
214 | ||
215 | return pmx->machdata->nfunctions; | |
216 | } | |
217 | ||
218 | static const char *spear_pinctrl_get_func_name(struct pinctrl_dev *pctldev, | |
219 | unsigned function) | |
220 | { | |
221 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); | |
222 | ||
223 | return pmx->machdata->functions[function]->name; | |
224 | } | |
225 | ||
226 | static int spear_pinctrl_get_func_groups(struct pinctrl_dev *pctldev, | |
227 | unsigned function, const char *const **groups, | |
228 | unsigned * const ngroups) | |
229 | { | |
230 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); | |
231 | ||
232 | *groups = pmx->machdata->functions[function]->groups; | |
233 | *ngroups = pmx->machdata->functions[function]->ngroups; | |
234 | ||
235 | return 0; | |
236 | } | |
237 | ||
238 | static int spear_pinctrl_endisable(struct pinctrl_dev *pctldev, | |
239 | unsigned function, unsigned group, bool enable) | |
240 | { | |
241 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); | |
242 | const struct spear_pingroup *pgroup; | |
243 | const struct spear_modemux *modemux; | |
f4f8e563 | 244 | int i; |
deda8287 VK |
245 | bool found = false; |
246 | ||
247 | pgroup = pmx->machdata->groups[group]; | |
248 | ||
249 | for (i = 0; i < pgroup->nmodemuxs; i++) { | |
250 | modemux = &pgroup->modemuxs[i]; | |
251 | ||
252 | /* SoC have any modes */ | |
253 | if (pmx->machdata->modes_supported) { | |
254 | if (!(pmx->machdata->mode & modemux->modes)) | |
255 | continue; | |
256 | } | |
257 | ||
258 | found = true; | |
f4f8e563 VK |
259 | muxregs_endisable(pmx, modemux->muxregs, modemux->nmuxregs, |
260 | enable); | |
deda8287 VK |
261 | } |
262 | ||
263 | if (!found) { | |
264 | dev_err(pmx->dev, "pinmux group: %s not supported\n", | |
265 | pgroup->name); | |
266 | return -ENODEV; | |
267 | } | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | static int spear_pinctrl_enable(struct pinctrl_dev *pctldev, unsigned function, | |
273 | unsigned group) | |
274 | { | |
275 | return spear_pinctrl_endisable(pctldev, function, group, true); | |
276 | } | |
277 | ||
278 | static void spear_pinctrl_disable(struct pinctrl_dev *pctldev, | |
279 | unsigned function, unsigned group) | |
280 | { | |
281 | spear_pinctrl_endisable(pctldev, function, group, false); | |
282 | } | |
283 | ||
f4f8e563 VK |
284 | /* gpio with pinmux */ |
285 | static struct spear_gpio_pingroup *get_gpio_pingroup(struct spear_pmx *pmx, | |
286 | unsigned pin) | |
287 | { | |
288 | struct spear_gpio_pingroup *gpio_pingroup; | |
6f37b1b4 | 289 | int i, j; |
f4f8e563 VK |
290 | |
291 | if (!pmx->machdata->gpio_pingroups) | |
292 | return NULL; | |
293 | ||
6f37b1b4 | 294 | for (i = 0; i < pmx->machdata->ngpio_pingroups; i++) { |
f4f8e563 VK |
295 | gpio_pingroup = &pmx->machdata->gpio_pingroups[i]; |
296 | ||
297 | for (j = 0; j < gpio_pingroup->npins; j++) { | |
298 | if (gpio_pingroup->pins[j] == pin) | |
299 | return gpio_pingroup; | |
300 | } | |
301 | } | |
302 | ||
6f37b1b4 | 303 | return NULL; |
f4f8e563 VK |
304 | } |
305 | ||
306 | static int gpio_request_endisable(struct pinctrl_dev *pctldev, | |
307 | struct pinctrl_gpio_range *range, unsigned offset, bool enable) | |
308 | { | |
309 | struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev); | |
826d6ca8 | 310 | struct spear_pinctrl_machdata *machdata = pmx->machdata; |
f4f8e563 VK |
311 | struct spear_gpio_pingroup *gpio_pingroup; |
312 | ||
826d6ca8 SH |
313 | /* |
314 | * Some SoC have configuration options applicable to group of pins, | |
315 | * rather than a single pin. | |
316 | */ | |
f4f8e563 | 317 | gpio_pingroup = get_gpio_pingroup(pmx, offset); |
f4f8e563 VK |
318 | if (gpio_pingroup) |
319 | muxregs_endisable(pmx, gpio_pingroup->muxregs, | |
320 | gpio_pingroup->nmuxregs, enable); | |
321 | ||
826d6ca8 SH |
322 | /* |
323 | * SoC may need some extra configurations, or configurations for single | |
324 | * pin | |
325 | */ | |
326 | if (machdata->gpio_request_endisable) | |
327 | machdata->gpio_request_endisable(pmx, offset, enable); | |
328 | ||
f4f8e563 VK |
329 | return 0; |
330 | } | |
331 | ||
332 | static int gpio_request_enable(struct pinctrl_dev *pctldev, | |
333 | struct pinctrl_gpio_range *range, unsigned offset) | |
334 | { | |
335 | return gpio_request_endisable(pctldev, range, offset, true); | |
336 | } | |
337 | ||
338 | static void gpio_disable_free(struct pinctrl_dev *pctldev, | |
339 | struct pinctrl_gpio_range *range, unsigned offset) | |
340 | { | |
341 | gpio_request_endisable(pctldev, range, offset, false); | |
342 | } | |
343 | ||
deda8287 VK |
344 | static struct pinmux_ops spear_pinmux_ops = { |
345 | .get_functions_count = spear_pinctrl_get_funcs_count, | |
346 | .get_function_name = spear_pinctrl_get_func_name, | |
347 | .get_function_groups = spear_pinctrl_get_func_groups, | |
348 | .enable = spear_pinctrl_enable, | |
349 | .disable = spear_pinctrl_disable, | |
f4f8e563 VK |
350 | .gpio_request_enable = gpio_request_enable, |
351 | .gpio_disable_free = gpio_disable_free, | |
deda8287 VK |
352 | }; |
353 | ||
354 | static struct pinctrl_desc spear_pinctrl_desc = { | |
355 | .name = DRIVER_NAME, | |
356 | .pctlops = &spear_pinctrl_ops, | |
357 | .pmxops = &spear_pinmux_ops, | |
358 | .owner = THIS_MODULE, | |
359 | }; | |
360 | ||
361 | int __devinit spear_pinctrl_probe(struct platform_device *pdev, | |
362 | struct spear_pinctrl_machdata *machdata) | |
363 | { | |
364 | struct device_node *np = pdev->dev.of_node; | |
365 | struct resource *res; | |
366 | struct spear_pmx *pmx; | |
367 | ||
368 | if (!machdata) | |
369 | return -ENODEV; | |
370 | ||
371 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
372 | if (!res) | |
373 | return -EINVAL; | |
374 | ||
375 | pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL); | |
376 | if (!pmx) { | |
377 | dev_err(&pdev->dev, "Can't alloc spear_pmx\n"); | |
378 | return -ENOMEM; | |
379 | } | |
380 | ||
381 | pmx->vbase = devm_ioremap(&pdev->dev, res->start, resource_size(res)); | |
382 | if (!pmx->vbase) { | |
383 | dev_err(&pdev->dev, "Couldn't ioremap at index 0\n"); | |
384 | return -ENODEV; | |
385 | } | |
386 | ||
387 | pmx->dev = &pdev->dev; | |
388 | pmx->machdata = machdata; | |
389 | ||
390 | /* configure mode, if supported by SoC */ | |
391 | if (machdata->modes_supported) { | |
392 | int mode = 0; | |
393 | ||
394 | if (of_property_read_u32(np, "st,pinmux-mode", &mode)) { | |
395 | dev_err(&pdev->dev, "OF: pinmux mode not passed\n"); | |
396 | return -EINVAL; | |
397 | } | |
398 | ||
399 | if (set_mode(pmx, mode)) { | |
400 | dev_err(&pdev->dev, "OF: Couldn't configure mode: %x\n", | |
401 | mode); | |
402 | return -EINVAL; | |
403 | } | |
404 | } | |
405 | ||
406 | platform_set_drvdata(pdev, pmx); | |
407 | ||
408 | spear_pinctrl_desc.pins = machdata->pins; | |
409 | spear_pinctrl_desc.npins = machdata->npins; | |
410 | ||
411 | pmx->pctl = pinctrl_register(&spear_pinctrl_desc, &pdev->dev, pmx); | |
8003ae33 | 412 | if (!pmx->pctl) { |
deda8287 | 413 | dev_err(&pdev->dev, "Couldn't register pinctrl driver\n"); |
8003ae33 | 414 | return -ENODEV; |
deda8287 VK |
415 | } |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
420 | int __devexit spear_pinctrl_remove(struct platform_device *pdev) | |
421 | { | |
422 | struct spear_pmx *pmx = platform_get_drvdata(pdev); | |
423 | ||
424 | pinctrl_unregister(pmx->pctl); | |
425 | ||
426 | return 0; | |
427 | } |