1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
6 #include <linux/module.h>
7 #include <linux/device.h>
9 #include <linux/platform_device.h>
10 #include <linux/slab.h>
12 #include <linux/pinctrl/pinctrl.h>
13 #include <linux/pinctrl/pinconf.h>
14 #include <linux/pinctrl/pinconf-generic.h>
15 #include <linux/pinctrl/pinmux.h>
16 #include <linux/pinctrl/consumer.h>
17 #include <linux/pinctrl/machine.h>
19 #include <asm/mach-ralink/ralink_regs.h>
20 #include <asm/mach-ralink/pinmux.h>
21 #include <asm/mach-ralink/mt7620.h>
24 #include "pinctrl-utils.h"
26 #define SYSC_REG_GPIO_MODE 0x60
27 #define SYSC_REG_GPIO_MODE2 0x64
32 struct pinctrl_pin_desc *pads;
33 struct pinctrl_desc *desc;
35 struct rt2880_pmx_func **func;
38 struct rt2880_pmx_group *groups;
39 const char **group_names;
46 static int rt2880_get_group_count(struct pinctrl_dev *pctrldev)
48 struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
50 return p->group_count;
53 static const char *rt2880_get_group_name(struct pinctrl_dev *pctrldev,
56 struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
58 return (group >= p->group_count) ? NULL : p->group_names[group];
61 static int rt2880_get_group_pins(struct pinctrl_dev *pctrldev,
63 const unsigned int **pins,
64 unsigned int *num_pins)
66 struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
68 if (group >= p->group_count)
71 *pins = p->groups[group].func[0].pins;
72 *num_pins = p->groups[group].func[0].pin_count;
77 static const struct pinctrl_ops rt2880_pctrl_ops = {
78 .get_groups_count = rt2880_get_group_count,
79 .get_group_name = rt2880_get_group_name,
80 .get_group_pins = rt2880_get_group_pins,
81 .dt_node_to_map = pinconf_generic_dt_node_to_map_all,
82 .dt_free_map = pinconf_generic_dt_free_map,
85 static int rt2880_pmx_func_count(struct pinctrl_dev *pctrldev)
87 struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
92 static const char *rt2880_pmx_func_name(struct pinctrl_dev *pctrldev,
95 struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
97 return p->func[func]->name;
100 static int rt2880_pmx_group_get_groups(struct pinctrl_dev *pctrldev,
102 const char * const **groups,
103 unsigned int * const num_groups)
105 struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
107 if (p->func[func]->group_count == 1)
108 *groups = &p->group_names[p->func[func]->groups[0]];
110 *groups = p->group_names;
112 *num_groups = p->func[func]->group_count;
117 static int rt2880_pmx_group_enable(struct pinctrl_dev *pctrldev,
118 unsigned int func, unsigned int group)
120 struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
122 u32 reg = SYSC_REG_GPIO_MODE;
126 /* dont allow double use */
127 if (p->groups[group].enabled) {
128 dev_err(p->dev, "%s is already enabled\n",
129 p->groups[group].name);
133 p->groups[group].enabled = 1;
134 p->func[func]->enabled = 1;
136 shift = p->groups[group].shift;
139 reg = SYSC_REG_GPIO_MODE2;
141 mode = rt_sysc_r32(reg);
142 mode &= ~(p->groups[group].mask << shift);
144 /* mark the pins as gpio */
145 for (i = 0; i < p->groups[group].func[0].pin_count; i++)
146 p->gpio[p->groups[group].func[0].pins[i]] = 1;
148 /* function 0 is gpio and needs special handling */
150 mode |= p->groups[group].gpio << shift;
152 for (i = 0; i < p->func[func]->pin_count; i++)
153 p->gpio[p->func[func]->pins[i]] = 0;
154 mode |= p->func[func]->value << shift;
156 rt_sysc_w32(mode, reg);
161 static int rt2880_pmx_group_gpio_request_enable(struct pinctrl_dev *pctrldev,
162 struct pinctrl_gpio_range *range,
165 struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
168 dev_err(p->dev, "pin %d is not set to gpio mux\n", pin);
175 static const struct pinmux_ops rt2880_pmx_group_ops = {
176 .get_functions_count = rt2880_pmx_func_count,
177 .get_function_name = rt2880_pmx_func_name,
178 .get_function_groups = rt2880_pmx_group_get_groups,
179 .set_mux = rt2880_pmx_group_enable,
180 .gpio_request_enable = rt2880_pmx_group_gpio_request_enable,
183 static struct pinctrl_desc rt2880_pctrl_desc = {
184 .owner = THIS_MODULE,
185 .name = "rt2880-pinmux",
186 .pctlops = &rt2880_pctrl_ops,
187 .pmxops = &rt2880_pmx_group_ops,
190 static struct rt2880_pmx_func gpio_func = {
194 static int rt2880_pinmux_index(struct rt2880_priv *p)
196 struct rt2880_pmx_func **f;
197 struct rt2880_pmx_group *mux = p->groups;
200 /* count the mux functions */
206 /* allocate the group names array needed by the gpio function */
207 p->group_names = devm_kcalloc(p->dev, p->group_count,
208 sizeof(char *), GFP_KERNEL);
212 for (i = 0; i < p->group_count; i++) {
213 p->group_names[i] = p->groups[i].name;
214 p->func_count += p->groups[i].func_count;
217 /* we have a dummy function[0] for gpio */
220 /* allocate our function and group mapping index buffers */
221 f = p->func = devm_kcalloc(p->dev,
225 gpio_func.groups = devm_kcalloc(p->dev, p->group_count, sizeof(int),
227 if (!f || !gpio_func.groups)
230 /* add a backpointer to the function so it knows its group */
231 gpio_func.group_count = p->group_count;
232 for (i = 0; i < gpio_func.group_count; i++)
233 gpio_func.groups[i] = i;
238 /* add remaining functions */
239 for (i = 0; i < p->group_count; i++) {
240 for (j = 0; j < p->groups[i].func_count; j++) {
241 f[c] = &p->groups[i].func[j];
242 f[c]->groups = devm_kzalloc(p->dev, sizeof(int),
245 f[c]->group_count = 1;
252 static int rt2880_pinmux_pins(struct rt2880_priv *p)
257 * loop over the functions and initialize the pins array.
258 * also work out the highest pin used.
260 for (i = 0; i < p->func_count; i++) {
263 if (!p->func[i]->pin_count)
266 p->func[i]->pins = devm_kcalloc(p->dev,
267 p->func[i]->pin_count,
270 if (!p->func[i]->pins)
272 for (j = 0; j < p->func[i]->pin_count; j++)
273 p->func[i]->pins[j] = p->func[i]->pin_first + j;
275 pin = p->func[i]->pin_first + p->func[i]->pin_count;
276 if (pin > p->max_pins)
280 /* the buffer that tells us which pins are gpio */
281 p->gpio = devm_kcalloc(p->dev, p->max_pins, sizeof(u8), GFP_KERNEL);
282 /* the pads needed to tell pinctrl about our pins */
283 p->pads = devm_kcalloc(p->dev, p->max_pins,
284 sizeof(struct pinctrl_pin_desc), GFP_KERNEL);
285 if (!p->pads || !p->gpio) {
286 dev_err(p->dev, "Failed to allocate gpio data\n");
290 memset(p->gpio, 1, sizeof(u8) * p->max_pins);
291 for (i = 0; i < p->func_count; i++) {
292 if (!p->func[i]->pin_count)
295 for (j = 0; j < p->func[i]->pin_count; j++)
296 p->gpio[p->func[i]->pins[j]] = 0;
299 /* pin 0 is always a gpio */
303 for (i = 0; i < p->max_pins; i++) {
304 /* strlen("ioXY") + 1 = 5 */
305 char *name = devm_kzalloc(p->dev, 5, GFP_KERNEL);
309 snprintf(name, 5, "io%d", i);
310 p->pads[i].number = i;
311 p->pads[i].name = name;
313 p->desc->pins = p->pads;
314 p->desc->npins = p->max_pins;
319 static int rt2880_pinmux_probe(struct platform_device *pdev)
321 struct rt2880_priv *p;
322 struct pinctrl_dev *dev;
323 struct device_node *np;
325 if (!rt2880_pinmux_data)
328 /* setup the private data */
329 p = devm_kzalloc(&pdev->dev, sizeof(struct rt2880_priv), GFP_KERNEL);
334 p->desc = &rt2880_pctrl_desc;
335 p->groups = rt2880_pinmux_data;
336 platform_set_drvdata(pdev, p);
338 /* init the device */
339 if (rt2880_pinmux_index(p)) {
340 dev_err(&pdev->dev, "failed to load index\n");
343 if (rt2880_pinmux_pins(p)) {
344 dev_err(&pdev->dev, "failed to load pins\n");
347 dev = pinctrl_register(p->desc, &pdev->dev, p);
351 /* finalize by adding gpio ranges for enables gpio controllers */
352 for_each_compatible_node(np, NULL, "ralink,rt2880-gpio") {
353 const __be32 *ngpio, *gpiobase;
354 struct pinctrl_gpio_range *range;
356 if (!of_device_is_available(np))
359 ngpio = of_get_property(np, "ralink,num-gpios", NULL);
360 gpiobase = of_get_property(np, "ralink,gpio-base", NULL);
361 if (!ngpio || !gpiobase) {
362 dev_err(&pdev->dev, "failed to load chip info\n");
367 range = devm_kzalloc(p->dev, sizeof(*range), GFP_KERNEL);
373 range->npins = __be32_to_cpu(*ngpio);
374 range->base = __be32_to_cpu(*gpiobase);
375 range->pin_base = range->base;
376 pinctrl_add_gpio_range(dev, range);
382 static const struct of_device_id rt2880_pinmux_match[] = {
383 { .compatible = "ralink,rt2880-pinmux" },
386 MODULE_DEVICE_TABLE(of, rt2880_pinmux_match);
388 static struct platform_driver rt2880_pinmux_driver = {
389 .probe = rt2880_pinmux_probe,
391 .name = "rt2880-pinmux",
392 .of_match_table = rt2880_pinmux_match,
396 int __init rt2880_pinmux_init(void)
398 return platform_driver_register(&rt2880_pinmux_driver);
401 core_initcall_sync(rt2880_pinmux_init);