1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Author: zhanghongchen <zhanghongchen@loongson.cn>
4 * Yinbo Zhu <zhuyinbo@loongson.cn>
5 * Copyright (C) 2022-2023 Loongson Technology Corporation Limited
6 */
7
8 #include <linux/init.h>
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/pinctrl/pinmux.h>
12 #include <linux/pinctrl/pinconf-generic.h>
13 #include <linux/pinctrl/pinctrl.h>
14 #include <linux/bitops.h>
15 #include <linux/io.h>
16 #include <linux/seq_file.h>
17
18 #include "core.h"
19 #include "pinctrl-utils.h"
20
21 #define PMX_GROUP(name, offset, bitv) \
22 { \
23 .grp = PINCTRL_PINGROUP((#name), (name ## _pins), \
24 ARRAY_SIZE((name ## _pins))), \
25 .reg = offset, \
26 .bit = bitv, \
27 }
28
29 #define SPECIFIC_GROUP(group) \
30 static const char * const group##_groups[] = { \
31 #group \
32 }
33
34 #define FUNCTION(fn) \
35 { \
36 .name = #fn, \
37 .groups = fn ## _groups, \
38 .num_groups = ARRAY_SIZE(fn ## _groups), \
39 }
40
41 struct loongson2_pinctrl {
42 struct device *dev;
43 struct pinctrl_dev *pcdev;
44 struct pinctrl_desc desc;
45 struct device_node *of_node;
46 spinlock_t lock;
47 void __iomem *reg_base;
48 };
49
50 struct loongson2_pmx_group {
51 struct pingroup grp;
52 unsigned int reg;
53 unsigned int bit;
54 };
55
56 struct loongson2_pmx_func {
57 const char *name;
58 const char * const *groups;
59 unsigned int num_groups;
60 };
61
62 #define LOONGSON2_PIN(x) PINCTRL_PIN(x, "gpio"#x)
63 static const struct pinctrl_pin_desc loongson2_pctrl_pins[] = {
64 LOONGSON2_PIN(0), LOONGSON2_PIN(1), LOONGSON2_PIN(2), LOONGSON2_PIN(3),
65 LOONGSON2_PIN(4), LOONGSON2_PIN(5), LOONGSON2_PIN(6), LOONGSON2_PIN(7),
66 LOONGSON2_PIN(8), LOONGSON2_PIN(9), LOONGSON2_PIN(10), LOONGSON2_PIN(11),
67 LOONGSON2_PIN(12), LOONGSON2_PIN(13), LOONGSON2_PIN(14),
68 LOONGSON2_PIN(16), LOONGSON2_PIN(17), LOONGSON2_PIN(18), LOONGSON2_PIN(19),
69 LOONGSON2_PIN(20), LOONGSON2_PIN(21), LOONGSON2_PIN(22), LOONGSON2_PIN(23),
70 LOONGSON2_PIN(24), LOONGSON2_PIN(25), LOONGSON2_PIN(26), LOONGSON2_PIN(27),
71 LOONGSON2_PIN(28), LOONGSON2_PIN(29), LOONGSON2_PIN(30),
72 LOONGSON2_PIN(32), LOONGSON2_PIN(33), LOONGSON2_PIN(34), LOONGSON2_PIN(35),
73 LOONGSON2_PIN(36), LOONGSON2_PIN(37), LOONGSON2_PIN(38), LOONGSON2_PIN(39),
74 LOONGSON2_PIN(40), LOONGSON2_PIN(41),
75 LOONGSON2_PIN(44), LOONGSON2_PIN(45), LOONGSON2_PIN(46), LOONGSON2_PIN(47),
76 LOONGSON2_PIN(48), LOONGSON2_PIN(49), LOONGSON2_PIN(50), LOONGSON2_PIN(51),
77 LOONGSON2_PIN(52), LOONGSON2_PIN(53), LOONGSON2_PIN(54), LOONGSON2_PIN(55),
78 LOONGSON2_PIN(56), LOONGSON2_PIN(57), LOONGSON2_PIN(58), LOONGSON2_PIN(59),
79 LOONGSON2_PIN(60), LOONGSON2_PIN(61), LOONGSON2_PIN(62), LOONGSON2_PIN(63),
80 };
81
82 static const unsigned int gpio_pins[] = {0, 1, 2, 3, 4, 5, 6, 7,
83 8, 9, 10, 11, 12, 13, 14,
84 16, 17, 18, 19, 20, 21, 22, 23,
85 24, 25, 26, 27, 28, 29, 30,
86 32, 33, 34, 35, 36, 37, 38, 39,
87 40, 43, 44, 45, 46, 47,
88 48, 49, 50, 51, 52, 53, 46, 55,
89 56, 57, 58, 59, 60, 61, 62, 63};
90 static const unsigned int sdio_pins[] = {36, 37, 38, 39, 40, 41};
91 static const unsigned int can1_pins[] = {34, 35};
92 static const unsigned int can0_pins[] = {32, 33};
93 static const unsigned int pwm3_pins[] = {23};
94 static const unsigned int pwm2_pins[] = {22};
95 static const unsigned int pwm1_pins[] = {21};
96 static const unsigned int pwm0_pins[] = {20};
97 static const unsigned int i2c1_pins[] = {18, 19};
98 static const unsigned int i2c0_pins[] = {16, 17};
99 static const unsigned int nand_pins[] = {44, 45, 46, 47, 48, 49, 50, 51,
100 52, 53, 54, 55, 56, 57, 58, 59, 60,
101 61, 62, 63};
102 static const unsigned int sata_led_pins[] = {14};
103 static const unsigned int i2s_pins[] = {24, 25, 26, 27, 28};
104 static const unsigned int hda_pins[] = {24, 25, 26, 27, 28, 29, 30};
105
106 static struct loongson2_pmx_group loongson2_pmx_groups[] = {
107 PMX_GROUP(gpio, 0x0, 64),
108 PMX_GROUP(sdio, 0x0, 20),
109 PMX_GROUP(can1, 0x0, 17),
110 PMX_GROUP(can0, 0x0, 16),
111 PMX_GROUP(pwm3, 0x0, 15),
112 PMX_GROUP(pwm2, 0x0, 14),
113 PMX_GROUP(pwm1, 0x0, 13),
114 PMX_GROUP(pwm0, 0x0, 12),
115 PMX_GROUP(i2c1, 0x0, 11),
116 PMX_GROUP(i2c0, 0x0, 10),
117 PMX_GROUP(nand, 0x0, 9),
118 PMX_GROUP(sata_led, 0x0, 8),
119 PMX_GROUP(i2s, 0x0, 6),
120 PMX_GROUP(hda, 0x0, 4),
121 };
122
123 SPECIFIC_GROUP(sdio);
124 SPECIFIC_GROUP(can1);
125 SPECIFIC_GROUP(can0);
126 SPECIFIC_GROUP(pwm3);
127 SPECIFIC_GROUP(pwm2);
128 SPECIFIC_GROUP(pwm1);
129 SPECIFIC_GROUP(pwm0);
130 SPECIFIC_GROUP(i2c1);
131 SPECIFIC_GROUP(i2c0);
132 SPECIFIC_GROUP(nand);
133 SPECIFIC_GROUP(sata_led);
134 SPECIFIC_GROUP(i2s);
135 SPECIFIC_GROUP(hda);
136
137 static const char * const gpio_groups[] = {
138 "sdio",
139 "can1", "can0",
140 "pwm3", "pwm2", "pwm1", "pwm0",
141 "i2c1", "i2c0",
142 "nand",
143 "sata_led",
144 "i2s",
145 "hda",
146 };
147
148 static const struct loongson2_pmx_func loongson2_pmx_functions[] = {
149 FUNCTION(gpio),
150 FUNCTION(sdio),
151 FUNCTION(can1),
152 FUNCTION(can0),
153 FUNCTION(pwm3),
154 FUNCTION(pwm2),
155 FUNCTION(pwm1),
156 FUNCTION(pwm0),
157 FUNCTION(i2c1),
158 FUNCTION(i2c0),
159 FUNCTION(nand),
160 FUNCTION(sata_led),
161 FUNCTION(i2s),
162 FUNCTION(hda),
163 };
164
loongson2_get_groups_count(struct pinctrl_dev * pcdev)165 static int loongson2_get_groups_count(struct pinctrl_dev *pcdev)
166 {
167 return ARRAY_SIZE(loongson2_pmx_groups);
168 }
169
loongson2_get_group_name(struct pinctrl_dev * pcdev,unsigned int selector)170 static const char *loongson2_get_group_name(struct pinctrl_dev *pcdev,
171 unsigned int selector)
172 {
173 return loongson2_pmx_groups[selector].grp.name;
174 }
175
loongson2_get_group_pins(struct pinctrl_dev * pcdev,unsigned int selector,const unsigned int ** pins,unsigned int * num_pins)176 static int loongson2_get_group_pins(struct pinctrl_dev *pcdev, unsigned int selector,
177 const unsigned int **pins, unsigned int *num_pins)
178 {
179 *pins = loongson2_pmx_groups[selector].grp.pins;
180 *num_pins = loongson2_pmx_groups[selector].grp.npins;
181
182 return 0;
183 }
184
loongson2_pin_dbg_show(struct pinctrl_dev * pcdev,struct seq_file * s,unsigned int offset)185 static void loongson2_pin_dbg_show(struct pinctrl_dev *pcdev, struct seq_file *s,
186 unsigned int offset)
187 {
188 seq_printf(s, " %s", dev_name(pcdev->dev));
189 }
190
191 static const struct pinctrl_ops loongson2_pctrl_ops = {
192 .get_groups_count = loongson2_get_groups_count,
193 .get_group_name = loongson2_get_group_name,
194 .get_group_pins = loongson2_get_group_pins,
195 .dt_node_to_map = pinconf_generic_dt_node_to_map_all,
196 .dt_free_map = pinctrl_utils_free_map,
197 .pin_dbg_show = loongson2_pin_dbg_show,
198 };
199
loongson2_pmx_set_mux(struct pinctrl_dev * pcdev,unsigned int func_num,unsigned int group_num)200 static int loongson2_pmx_set_mux(struct pinctrl_dev *pcdev, unsigned int func_num,
201 unsigned int group_num)
202 {
203 struct loongson2_pinctrl *pctrl = pinctrl_dev_get_drvdata(pcdev);
204 void __iomem *reg = pctrl->reg_base +
205 loongson2_pmx_groups[group_num].reg;
206 unsigned int mux_bit = loongson2_pmx_groups[group_num].bit;
207 unsigned int val;
208 unsigned long flags;
209
210 spin_lock_irqsave(&pctrl->lock, flags);
211 val = readl(reg);
212 if (func_num == 0)
213 val &= ~BIT(mux_bit);
214 else
215 val |= BIT(mux_bit);
216 writel(val, reg);
217 spin_unlock_irqrestore(&pctrl->lock, flags);
218
219 return 0;
220 }
221
loongson2_pmx_get_funcs_count(struct pinctrl_dev * pcdev)222 static int loongson2_pmx_get_funcs_count(struct pinctrl_dev *pcdev)
223 {
224 return ARRAY_SIZE(loongson2_pmx_functions);
225 }
226
loongson2_pmx_get_func_name(struct pinctrl_dev * pcdev,unsigned int selector)227 static const char *loongson2_pmx_get_func_name(struct pinctrl_dev *pcdev,
228 unsigned int selector)
229 {
230 return loongson2_pmx_functions[selector].name;
231 }
232
loongson2_pmx_get_groups(struct pinctrl_dev * pcdev,unsigned int selector,const char * const ** groups,unsigned int * const num_groups)233 static int loongson2_pmx_get_groups(struct pinctrl_dev *pcdev,
234 unsigned int selector,
235 const char * const **groups,
236 unsigned int * const num_groups)
237 {
238 *groups = loongson2_pmx_functions[selector].groups;
239 *num_groups = loongson2_pmx_functions[selector].num_groups;
240
241 return 0;
242 }
243
244 static const struct pinmux_ops loongson2_pmx_ops = {
245 .set_mux = loongson2_pmx_set_mux,
246 .get_functions_count = loongson2_pmx_get_funcs_count,
247 .get_function_name = loongson2_pmx_get_func_name,
248 .get_function_groups = loongson2_pmx_get_groups,
249 };
250
loongson2_pinctrl_probe(struct platform_device * pdev)251 static int loongson2_pinctrl_probe(struct platform_device *pdev)
252 {
253 struct device *dev = &pdev->dev;
254 struct loongson2_pinctrl *pctrl;
255
256 pctrl = devm_kzalloc(dev, sizeof(*pctrl), GFP_KERNEL);
257 if (!pctrl)
258 return -ENOMEM;
259
260 pctrl->reg_base = devm_platform_ioremap_resource(pdev, 0);
261 if (IS_ERR(pctrl->reg_base))
262 return PTR_ERR(pctrl->reg_base);
263
264 spin_lock_init(&pctrl->lock);
265
266 pctrl->dev = dev;
267 pctrl->desc.name = "pinctrl-loongson2";
268 pctrl->desc.owner = THIS_MODULE;
269 pctrl->desc.pctlops = &loongson2_pctrl_ops;
270 pctrl->desc.pmxops = &loongson2_pmx_ops;
271 pctrl->desc.pins = loongson2_pctrl_pins;
272 pctrl->desc.npins = ARRAY_SIZE(loongson2_pctrl_pins);
273
274 pctrl->pcdev = devm_pinctrl_register(pctrl->dev, &pctrl->desc, pctrl);
275 if (IS_ERR(pctrl->pcdev))
276 return dev_err_probe(pctrl->dev, PTR_ERR(pctrl->pcdev),
277 "can't register pinctrl device");
278
279 return 0;
280 }
281
282 static const struct of_device_id loongson2_pinctrl_dt_match[] = {
283 {
284 .compatible = "loongson,ls2k-pinctrl",
285 },
286 { }
287 };
288 MODULE_DEVICE_TABLE(of, loongson2_pinctrl_dt_match);
289
290 static struct platform_driver loongson2_pinctrl_driver = {
291 .probe = loongson2_pinctrl_probe,
292 .driver = {
293 .name = "loongson2-pinctrl",
294 .of_match_table = loongson2_pinctrl_dt_match,
295 },
296 };
297
loongson2_pinctrl_init(void)298 static int __init loongson2_pinctrl_init(void)
299 {
300 return platform_driver_register(&loongson2_pinctrl_driver);
301 }
302 arch_initcall(loongson2_pinctrl_init);
303
loongson2_pinctrl_exit(void)304 static void __exit loongson2_pinctrl_exit(void)
305 {
306 platform_driver_unregister(&loongson2_pinctrl_driver);
307 }
308 module_exit(loongson2_pinctrl_exit);
309
310 MODULE_DESCRIPTION("Loongson2 Pinctrl driver");
311 MODULE_LICENSE("GPL");
312