drivers/soc/rockchip/grf.c

   1 /*
   2  * Rockchip Generic Register Files setup
   3  *
   4  * Copyright (c) 2016 Heiko Stuebner <heiko@sntech.de>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/err.h>
  12 #include <linux/mfd/syscon.h>
  13 #include <linux/of_device.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/regmap.h>
  16
  17 #define HIWORD_UPDATE(val, mask, shift) \
  18                 ((val) << (shift) | (mask) << ((shift) + 16))
  19
  20 struct rockchip_grf_value {
  21         const char *desc;
  22         u32 reg;
  23         u32 val;
  24 };
  25
  26 struct rockchip_grf_info {
  27         const struct rockchip_grf_value *values;
  28         int num_values;
  29 };
  30
  31 #define RK3036_GRF_SOC_CON0             0x140
  32
  33 static const struct rockchip_grf_value rk3036_defaults[] __initconst = {
  34         /*
  35          * Disable auto jtag/sdmmc switching that causes issues with the
  36          * clock-framework and the mmc controllers making them unreliable.
  37          */
  38         { "jtag switching", RK3036_GRF_SOC_CON0, HIWORD_UPDATE(0, 1, 11) },
  39 };
  40
  41 static const struct rockchip_grf_info rk3036_grf __initconst = {
  42         .values = rk3036_defaults,
  43         .num_values = ARRAY_SIZE(rk3036_defaults),
  44 };
  45
  46 #define RK3288_GRF_SOC_CON0             0x244
  47
  48 static const struct rockchip_grf_value rk3288_defaults[] __initconst = {
  49         { "jtag switching", RK3288_GRF_SOC_CON0, HIWORD_UPDATE(0, 1, 12) },
  50 };
  51
  52 static const struct rockchip_grf_info rk3288_grf __initconst = {
  53         .values = rk3288_defaults,
  54         .num_values = ARRAY_SIZE(rk3288_defaults),
  55 };
  56
  57 #define RK3368_GRF_SOC_CON15            0x43c
  58
  59 static const struct rockchip_grf_value rk3368_defaults[] __initconst = {
  60         { "jtag switching", RK3368_GRF_SOC_CON15, HIWORD_UPDATE(0, 1, 13) },
  61 };
  62
  63 static const struct rockchip_grf_info rk3368_grf __initconst = {
  64         .values = rk3368_defaults,
  65         .num_values = ARRAY_SIZE(rk3368_defaults),
  66 };
  67
  68 #define RK3399_GRF_SOC_CON7             0xe21c
  69
  70 static const struct rockchip_grf_value rk3399_defaults[] __initconst = {
  71         { "jtag switching", RK3399_GRF_SOC_CON7, HIWORD_UPDATE(0, 1, 12) },
  72 };
  73
  74 static const struct rockchip_grf_info rk3399_grf __initconst = {
  75         .values = rk3399_defaults,
  76         .num_values = ARRAY_SIZE(rk3399_defaults),
  77 };
  78
  79 static const struct of_device_id rockchip_grf_dt_match[] __initconst = {
  80         {
  81                 .compatible = "rockchip,rk3036-grf",
  82                 .data = (void *)&rk3036_grf,
  83         }, {
  84                 .compatible = "rockchip,rk3288-grf",
  85                 .data = (void *)&rk3288_grf,
  86         }, {
  87                 .compatible = "rockchip,rk3368-grf",
  88                 .data = (void *)&rk3368_grf,
  89         }, {
  90                 .compatible = "rockchip,rk3399-grf",
  91                 .data = (void *)&rk3399_grf,
  92         },
  93         { /* sentinel */ },
  94 };
  95
  96 static int __init rockchip_grf_init(void)
  97 {
  98         const struct rockchip_grf_info *grf_info;
  99         const struct of_device_id *match;
 100         struct device_node *np;
 101         struct regmap *grf;
 102         int ret, i;
 103
 104         np = of_find_matching_node_and_match(NULL, rockchip_grf_dt_match,
 105                                              &match);
 106         if (!np)
 107                 return -ENODEV;
 108         if (!match || !match->data) {
 109                 pr_err("%s: missing grf data\n", __func__);
 110                 return -EINVAL;
 111         }
 112
 113         grf_info = match->data;
 114
 115         grf = syscon_node_to_regmap(np);
 116         if (IS_ERR(grf)) {
 117                 pr_err("%s: could not get grf syscon\n", __func__);
 118                 return PTR_ERR(grf);
 119         }
 120
 121         for (i = 0; i < grf_info->num_values; i++) {
 122                 const struct rockchip_grf_value *val = &grf_info->values[i];
 123
 124                 pr_debug("%s: adjusting %s in %#6x to %#10x\n", __func__,
 125                         val->desc, val->reg, val->val);
 126                 ret = regmap_write(grf, val->reg, val->val);
 127                 if (ret < 0)
 128                         pr_err("%s: write to %#6x failed with %d\n",
 129                                __func__, val->reg, ret);
 130         }
 131
 132         return 0;
 133 }
 134 postcore_initcall(rockchip_grf_init);