2 * Driver for the ST Microelectronics SPEAr pinmux
4 * Copyright (C) 2012 ST Microelectronics
5 * Viresh Kumar <vireshk@kernel.org>
8 * - U300 Pinctl drivers
9 * - Tegra Pinctl drivers
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.
16 #include <linux/err.h>
17 #include <linux/module.h>
19 #include <linux/of_address.h>
20 #include <linux/of_gpio.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>
27 #include "pinctrl-spear.h"
29 #define DRIVER_NAME "spear-pinmux"
31 static void muxregs_endisable(struct spear_pmx *pmx,
32 struct spear_muxreg *muxregs, u8 count, bool enable)
34 struct spear_muxreg *muxreg;
37 for (j = 0; j < count; j++) {
40 val = pmx_readl(pmx, muxreg->reg);
48 val |= muxreg->mask & temp;
49 pmx_writel(pmx, val, muxreg->reg);
53 static int set_mode(struct spear_pmx *pmx, int mode)
55 struct spear_pmx_mode *pmx_mode = NULL;
59 if (!pmx->machdata->pmx_modes || !pmx->machdata->npmx_modes)
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];
72 val = pmx_readl(pmx, pmx_mode->reg);
73 val &= ~pmx_mode->mask;
75 pmx_writel(pmx, val, pmx_mode->reg);
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",
85 void pmx_init_gpio_pingroup_addr(struct spear_gpio_pingroup *gpio_pingroup,
86 unsigned count, u16 reg)
90 for (i = 0; i < count; i++)
91 for (j = 0; j < gpio_pingroup[i].nmuxregs; j++)
92 gpio_pingroup[i].muxregs[j].reg = reg;
95 void pmx_init_addr(struct spear_pinctrl_machdata *machdata, u16 reg)
97 struct spear_pingroup *pgroup;
98 struct spear_modemux *modemux;
101 for (group = 0; group < machdata->ngroups; group++) {
102 pgroup = machdata->groups[group];
104 for (i = 0; i < pgroup->nmodemuxs; i++) {
105 modemux = &pgroup->modemuxs[i];
107 for (j = 0; j < modemux->nmuxregs; j++)
108 if (modemux->muxregs[j].reg == 0xFFFF)
109 modemux->muxregs[j].reg = reg;
114 static int spear_pinctrl_get_groups_cnt(struct pinctrl_dev *pctldev)
116 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
118 return pmx->machdata->ngroups;
121 static const char *spear_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
124 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
126 return pmx->machdata->groups[group]->name;
129 static int spear_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
130 unsigned group, const unsigned **pins, unsigned *num_pins)
132 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
134 *pins = pmx->machdata->groups[group]->pins;
135 *num_pins = pmx->machdata->groups[group]->npins;
140 static void spear_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
141 struct seq_file *s, unsigned offset)
143 seq_printf(s, " " DRIVER_NAME);
146 static int spear_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
147 struct device_node *np_config,
148 struct pinctrl_map **map,
151 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
152 struct device_node *np;
153 struct property *prop;
154 const char *function, *group;
155 int ret, index = 0, count = 0;
157 /* calculate number of maps required */
158 for_each_child_of_node(np_config, np) {
159 ret = of_property_read_string(np, "st,function", &function);
165 ret = of_property_count_strings(np, "st,pins");
175 dev_err(pmx->dev, "No child nodes passed via DT\n");
179 *map = kcalloc(count, sizeof(**map), GFP_KERNEL);
183 for_each_child_of_node(np_config, np) {
184 of_property_read_string(np, "st,function", &function);
185 of_property_for_each_string(np, "st,pins", prop, group) {
186 (*map)[index].type = PIN_MAP_TYPE_MUX_GROUP;
187 (*map)[index].data.mux.group = group;
188 (*map)[index].data.mux.function = function;
198 static void spear_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
199 struct pinctrl_map *map,
205 static const struct pinctrl_ops spear_pinctrl_ops = {
206 .get_groups_count = spear_pinctrl_get_groups_cnt,
207 .get_group_name = spear_pinctrl_get_group_name,
208 .get_group_pins = spear_pinctrl_get_group_pins,
209 .pin_dbg_show = spear_pinctrl_pin_dbg_show,
210 .dt_node_to_map = spear_pinctrl_dt_node_to_map,
211 .dt_free_map = spear_pinctrl_dt_free_map,
214 static int spear_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
216 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
218 return pmx->machdata->nfunctions;
221 static const char *spear_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
224 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
226 return pmx->machdata->functions[function]->name;
229 static int spear_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
230 unsigned function, const char *const **groups,
231 unsigned * const ngroups)
233 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
235 *groups = pmx->machdata->functions[function]->groups;
236 *ngroups = pmx->machdata->functions[function]->ngroups;
241 static int spear_pinctrl_endisable(struct pinctrl_dev *pctldev,
242 unsigned function, unsigned group, bool enable)
244 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
245 const struct spear_pingroup *pgroup;
246 const struct spear_modemux *modemux;
250 pgroup = pmx->machdata->groups[group];
252 for (i = 0; i < pgroup->nmodemuxs; i++) {
253 modemux = &pgroup->modemuxs[i];
255 /* SoC have any modes */
256 if (pmx->machdata->modes_supported) {
257 if (!(pmx->machdata->mode & modemux->modes))
262 muxregs_endisable(pmx, modemux->muxregs, modemux->nmuxregs,
267 dev_err(pmx->dev, "pinmux group: %s not supported\n",
275 static int spear_pinctrl_set_mux(struct pinctrl_dev *pctldev, unsigned function,
278 return spear_pinctrl_endisable(pctldev, function, group, true);
281 /* gpio with pinmux */
282 static struct spear_gpio_pingroup *get_gpio_pingroup(struct spear_pmx *pmx,
285 struct spear_gpio_pingroup *gpio_pingroup;
288 if (!pmx->machdata->gpio_pingroups)
291 for (i = 0; i < pmx->machdata->ngpio_pingroups; i++) {
292 gpio_pingroup = &pmx->machdata->gpio_pingroups[i];
294 for (j = 0; j < gpio_pingroup->npins; j++) {
295 if (gpio_pingroup->pins[j] == pin)
296 return gpio_pingroup;
303 static int gpio_request_endisable(struct pinctrl_dev *pctldev,
304 struct pinctrl_gpio_range *range, unsigned offset, bool enable)
306 struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
307 struct spear_pinctrl_machdata *machdata = pmx->machdata;
308 struct spear_gpio_pingroup *gpio_pingroup;
311 * Some SoC have configuration options applicable to group of pins,
312 * rather than a single pin.
314 gpio_pingroup = get_gpio_pingroup(pmx, offset);
316 muxregs_endisable(pmx, gpio_pingroup->muxregs,
317 gpio_pingroup->nmuxregs, enable);
320 * SoC may need some extra configurations, or configurations for single
323 if (machdata->gpio_request_endisable)
324 machdata->gpio_request_endisable(pmx, offset, enable);
329 static int gpio_request_enable(struct pinctrl_dev *pctldev,
330 struct pinctrl_gpio_range *range, unsigned offset)
332 return gpio_request_endisable(pctldev, range, offset, true);
335 static void gpio_disable_free(struct pinctrl_dev *pctldev,
336 struct pinctrl_gpio_range *range, unsigned offset)
338 gpio_request_endisable(pctldev, range, offset, false);
341 static const struct pinmux_ops spear_pinmux_ops = {
342 .get_functions_count = spear_pinctrl_get_funcs_count,
343 .get_function_name = spear_pinctrl_get_func_name,
344 .get_function_groups = spear_pinctrl_get_func_groups,
345 .set_mux = spear_pinctrl_set_mux,
346 .gpio_request_enable = gpio_request_enable,
347 .gpio_disable_free = gpio_disable_free,
350 static struct pinctrl_desc spear_pinctrl_desc = {
352 .pctlops = &spear_pinctrl_ops,
353 .pmxops = &spear_pinmux_ops,
354 .owner = THIS_MODULE,
357 int spear_pinctrl_probe(struct platform_device *pdev,
358 struct spear_pinctrl_machdata *machdata)
360 struct device_node *np = pdev->dev.of_node;
361 struct spear_pmx *pmx;
366 pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
370 pmx->vbase = devm_platform_ioremap_resource(pdev, 0);
371 if (IS_ERR(pmx->vbase))
372 return PTR_ERR(pmx->vbase);
374 pmx->dev = &pdev->dev;
375 pmx->machdata = machdata;
377 /* configure mode, if supported by SoC */
378 if (machdata->modes_supported) {
381 if (of_property_read_u32(np, "st,pinmux-mode", &mode)) {
382 dev_err(&pdev->dev, "OF: pinmux mode not passed\n");
386 if (set_mode(pmx, mode)) {
387 dev_err(&pdev->dev, "OF: Couldn't configure mode: %x\n",
393 platform_set_drvdata(pdev, pmx);
395 spear_pinctrl_desc.pins = machdata->pins;
396 spear_pinctrl_desc.npins = machdata->npins;
398 pmx->pctl = devm_pinctrl_register(&pdev->dev, &spear_pinctrl_desc, pmx);
399 if (IS_ERR(pmx->pctl)) {
400 dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
401 return PTR_ERR(pmx->pctl);