drivers/soc/rockchip/grf.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Rockchip Generic Register Files setup
   4  *
   5  * Copyright (c) 2016 Heiko Stuebner <heiko@sntech.de>
   6  */
   7
   8 #include <linux/err.h>
   9 #include <linux/mfd/syscon.h>
  10 #include <linux/of_device.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/regmap.h>
  13
  14 #define HIWORD_UPDATE(val, mask, shift) \
  15                 ((val) << (shift) | (mask) << ((shift) + 16))
  16
  17 struct rockchip_grf_value {
  18         const char *desc;
  19         u32 reg;
  20         u32 val;
  21 };
  22
  23 struct rockchip_grf_info {
  24         const struct rockchip_grf_value *values;
  25         int num_values;
  26 };
  27
  28 #define RK3036_GRF_SOC_CON0             0x140
  29
  30 static const struct rockchip_grf_value rk3036_defaults[] __initconst = {
  31         /*
  32          * Disable auto jtag/sdmmc switching that causes issues with the
  33          * clock-framework and the mmc controllers making them unreliable.
  34          */
  35         { "jtag switching", RK3036_GRF_SOC_CON0, HIWORD_UPDATE(0, 1, 11) },
  36 };
  37
  38 static const struct rockchip_grf_info rk3036_grf __initconst = {
  39         .values = rk3036_defaults,
  40         .num_values = ARRAY_SIZE(rk3036_defaults),
  41 };
  42
  43 #define RK3128_GRF_SOC_CON0             0x140
  44
  45 static const struct rockchip_grf_value rk3128_defaults[] __initconst = {
  46         { "jtag switching", RK3128_GRF_SOC_CON0, HIWORD_UPDATE(0, 1, 8) },
  47 };
  48
  49 static const struct rockchip_grf_info rk3128_grf __initconst = {
  50         .values = rk3128_defaults,
  51         .num_values = ARRAY_SIZE(rk3128_defaults),
  52 };
  53
  54 #define RK3228_GRF_SOC_CON6             0x418
  55
  56 static const struct rockchip_grf_value rk3228_defaults[] __initconst = {
  57         { "jtag switching", RK3228_GRF_SOC_CON6, HIWORD_UPDATE(0, 1, 8) },
  58 };
  59
  60 static const struct rockchip_grf_info rk3228_grf __initconst = {
  61         .values = rk3228_defaults,
  62         .num_values = ARRAY_SIZE(rk3228_defaults),
  63 };
  64
  65 #define RK3288_GRF_SOC_CON0             0x244
  66 #define RK3288_GRF_SOC_CON2             0x24c
  67
  68 static const struct rockchip_grf_value rk3288_defaults[] __initconst = {
  69         { "jtag switching", RK3288_GRF_SOC_CON0, HIWORD_UPDATE(0, 1, 12) },
  70         { "pwm select", RK3288_GRF_SOC_CON2, HIWORD_UPDATE(1, 1, 0) },
  71 };
  72
  73 static const struct rockchip_grf_info rk3288_grf __initconst = {
  74         .values = rk3288_defaults,
  75         .num_values = ARRAY_SIZE(rk3288_defaults),
  76 };
  77
  78 #define RK3328_GRF_SOC_CON4             0x410
  79
  80 static const struct rockchip_grf_value rk3328_defaults[] __initconst = {
  81         { "jtag switching", RK3328_GRF_SOC_CON4, HIWORD_UPDATE(0, 1, 12) },
  82 };
  83
  84 static const struct rockchip_grf_info rk3328_grf __initconst = {
  85         .values = rk3328_defaults,
  86         .num_values = ARRAY_SIZE(rk3328_defaults),
  87 };
  88
  89 #define RK3368_GRF_SOC_CON15            0x43c
  90
  91 static const struct rockchip_grf_value rk3368_defaults[] __initconst = {
  92         { "jtag switching", RK3368_GRF_SOC_CON15, HIWORD_UPDATE(0, 1, 13) },
  93 };
  94
  95 static const struct rockchip_grf_info rk3368_grf __initconst = {
  96         .values = rk3368_defaults,
  97         .num_values = ARRAY_SIZE(rk3368_defaults),
  98 };
  99
 100 #define RK3399_GRF_SOC_CON7             0xe21c
 101
 102 static const struct rockchip_grf_value rk3399_defaults[] __initconst = {
 103         { "jtag switching", RK3399_GRF_SOC_CON7, HIWORD_UPDATE(0, 1, 12) },
 104 };
 105
 106 static const struct rockchip_grf_info rk3399_grf __initconst = {
 107         .values = rk3399_defaults,
 108         .num_values = ARRAY_SIZE(rk3399_defaults),
 109 };
 110
 111 static const struct of_device_id rockchip_grf_dt_match[] __initconst = {
 112         {
 113                 .compatible = "rockchip,rk3036-grf",
 114                 .data = (void *)&rk3036_grf,
 115         }, {
 116                 .compatible = "rockchip,rk3128-grf",
 117                 .data = (void *)&rk3128_grf,
 118         }, {
 119                 .compatible = "rockchip,rk3228-grf",
 120                 .data = (void *)&rk3228_grf,
 121         }, {
 122                 .compatible = "rockchip,rk3288-grf",
 123                 .data = (void *)&rk3288_grf,
 124         }, {
 125                 .compatible = "rockchip,rk3328-grf",
 126                 .data = (void *)&rk3328_grf,
 127         }, {
 128                 .compatible = "rockchip,rk3368-grf",
 129                 .data = (void *)&rk3368_grf,
 130         }, {
 131                 .compatible = "rockchip,rk3399-grf",
 132                 .data = (void *)&rk3399_grf,
 133         },
 134         { /* sentinel */ },
 135 };
 136
 137 static int __init rockchip_grf_init(void)
 138 {
 139         const struct rockchip_grf_info *grf_info;
 140         const struct of_device_id *match;
 141         struct device_node *np;
 142         struct regmap *grf;
 143         int ret, i;
 144
 145         np = of_find_matching_node_and_match(NULL, rockchip_grf_dt_match,
 146                                              &match);
 147         if (!np)
 148                 return -ENODEV;
 149         if (!match || !match->data) {
 150                 pr_err("%s: missing grf data\n", __func__);
 151                 return -EINVAL;
 152         }
 153
 154         grf_info = match->data;
 155
 156         grf = syscon_node_to_regmap(np);
 157         if (IS_ERR(grf)) {
 158                 pr_err("%s: could not get grf syscon\n", __func__);
 159                 return PTR_ERR(grf);
 160         }
 161
 162         for (i = 0; i < grf_info->num_values; i++) {
 163                 const struct rockchip_grf_value *val = &grf_info->values[i];
 164
 165                 pr_debug("%s: adjusting %s in %#6x to %#10x\n", __func__,
 166                         val->desc, val->reg, val->val);
 167                 ret = regmap_write(grf, val->reg, val->val);
 168                 if (ret < 0)
 169                         pr_err("%s: write to %#6x failed with %d\n",
 170                                __func__, val->reg, ret);
 171         }
 172
 173         return 0;
 174 }
 175 postcore_initcall(rockchip_grf_init);