drivers/pinctrl/pinctrl-loongson2.c

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