Commit | Line | Data |
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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> | |
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 | ||
247 | val |= temp; | |
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); | |
339 | if (IS_ERR(pmx->pctl)) { | |
340 | dev_err(&pdev->dev, "Couldn't register pinctrl driver\n"); | |
341 | return PTR_ERR(pmx->pctl); | |
342 | } | |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
347 | int __devexit spear_pinctrl_remove(struct platform_device *pdev) | |
348 | { | |
349 | struct spear_pmx *pmx = platform_get_drvdata(pdev); | |
350 | ||
351 | pinctrl_unregister(pmx->pctl); | |
352 | ||
353 | return 0; | |
354 | } |