drivers/pinctrl/uniphier/pinctrl-uniphier-core.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2015-2016 Socionext Inc.
   4  *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <linux/io.h>
  10 #include <linux/err.h>
  11 #include <linux/kernel.h>
  12 #include <linux/sizes.h>
  13 #include <dm/pinctrl.h>
  14
  15 #include "pinctrl-uniphier.h"
  16
  17 #define UNIPHIER_PINCTRL_PINMUX_BASE    0x1000
  18 #define UNIPHIER_PINCTRL_LOAD_PINMUX    0x1700
  19 #define UNIPHIER_PINCTRL_PUPDCTRL_BASE  0x1a00
  20 #define UNIPHIER_PINCTRL_IECTRL         0x1d00
  21
  22 static const char *uniphier_pinctrl_dummy_name = "_dummy";
  23
  24 static int uniphier_pinctrl_get_groups_count(struct udevice *dev)
  25 {
  26         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  27
  28         return priv->socdata->groups_count;
  29 }
  30
  31 static const char *uniphier_pinctrl_get_group_name(struct udevice *dev,
  32                                                    unsigned selector)
  33 {
  34         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  35
  36         if (!priv->socdata->groups[selector].name)
  37                 return uniphier_pinctrl_dummy_name;
  38
  39         return priv->socdata->groups[selector].name;
  40 }
  41
  42 static int uniphier_pinmux_get_functions_count(struct udevice *dev)
  43 {
  44         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  45
  46         return priv->socdata->functions_count;
  47 }
  48
  49 static const char *uniphier_pinmux_get_function_name(struct udevice *dev,
  50                                                      unsigned selector)
  51 {
  52         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  53
  54         if (!priv->socdata->functions[selector])
  55                 return uniphier_pinctrl_dummy_name;
  56
  57         return priv->socdata->functions[selector];
  58 }
  59
  60 static int uniphier_pinconf_input_enable_perpin(struct udevice *dev,
  61                                                 unsigned int pin, int enable)
  62 {
  63         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  64         unsigned reg;
  65         u32 mask, tmp;
  66
  67         reg = UNIPHIER_PINCTRL_IECTRL + pin / 32 * 4;
  68         mask = BIT(pin % 32);
  69
  70         tmp = readl(priv->base + reg);
  71         if (enable)
  72                 tmp |= mask;
  73         else
  74                 tmp &= ~mask;
  75         writel(tmp, priv->base + reg);
  76
  77         return 0;
  78 }
  79
  80 static int uniphier_pinconf_input_enable_legacy(struct udevice *dev,
  81                                                 unsigned int pin, int enable)
  82 {
  83         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  84
  85         /*
  86          * Multiple pins share one input enable, per-pin disabling is
  87          * impossible.
  88          */
  89         if (!enable)
  90                 return -EINVAL;
  91
  92         /* Set all bits instead of having a bunch of pin data */
  93         writel(U32_MAX, priv->base + UNIPHIER_PINCTRL_IECTRL);
  94
  95         return 0;
  96 }
  97
  98 static int uniphier_pinconf_input_enable(struct udevice *dev,
  99                                          unsigned int pin, int enable)
 100 {
 101         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
 102
 103         if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_PERPIN_IECTRL)
 104                 return uniphier_pinconf_input_enable_perpin(dev, pin, enable);
 105         else
 106                 return uniphier_pinconf_input_enable_legacy(dev, pin, enable);
 107 }
 108
 109 #if CONFIG_IS_ENABLED(PINCONF)
 110
 111 static const struct pinconf_param uniphier_pinconf_params[] = {
 112         { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
 113         { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
 114         { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
 115         { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
 116         { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
 117         { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
 118 };
 119
 120 static int uniphier_pinconf_bias_set(struct udevice *dev, unsigned int pin,
 121                                      unsigned int param, unsigned int arg)
 122 {
 123         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
 124         unsigned int enable = 1;
 125         unsigned int reg;
 126         u32 mask, tmp;
 127
 128         if (!(priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_PUPD_SIMPLE))
 129                 return -ENOTSUPP;
 130
 131         switch (param) {
 132         case PIN_CONFIG_BIAS_DISABLE:
 133                 enable = 0;
 134                 break;
 135         case PIN_CONFIG_BIAS_PULL_UP:
 136         case PIN_CONFIG_BIAS_PULL_DOWN:
 137                 if (arg == 0)   /* total bias is not supported */
 138                         return -EINVAL;
 139                 break;
 140         case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
 141                 if (arg == 0)   /* configuration ignored */
 142                         return 0;
 143         default:
 144                 BUG();
 145         }
 146
 147         reg = UNIPHIER_PINCTRL_PUPDCTRL_BASE + pin / 32 * 4;
 148         mask = BIT(pin % 32);
 149
 150         tmp = readl(priv->base + reg);
 151         if (enable)
 152                 tmp |= mask;
 153         else
 154                 tmp &= ~mask;
 155         writel(tmp, priv->base + reg);
 156
 157         return 0;
 158 }
 159
 160 static int uniphier_pinconf_set_one(struct udevice *dev, unsigned int pin,
 161                                     unsigned int param, unsigned int arg)
 162 {
 163         int ret;
 164
 165         switch (param) {
 166         case PIN_CONFIG_BIAS_DISABLE:
 167         case PIN_CONFIG_BIAS_PULL_UP:
 168         case PIN_CONFIG_BIAS_PULL_DOWN:
 169         case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
 170                 ret = uniphier_pinconf_bias_set(dev, pin, param, arg);
 171                 break;
 172         case PIN_CONFIG_INPUT_ENABLE:
 173                 ret = uniphier_pinconf_input_enable(dev, pin, arg);
 174                 break;
 175         default:
 176                 printf("unsupported configuration parameter %u\n", param);
 177                 return -EINVAL;
 178         }
 179
 180         return ret;
 181 }
 182
 183 static int uniphier_pinconf_group_set(struct udevice *dev,
 184                                       unsigned int group_selector,
 185                                       unsigned int param, unsigned int arg)
 186 {
 187         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
 188         const struct uniphier_pinctrl_group *grp =
 189                                         &priv->socdata->groups[group_selector];
 190         int i, ret;
 191
 192         for (i = 0; i < grp->num_pins; i++) {
 193                 ret = uniphier_pinconf_set_one(dev, grp->pins[i], param, arg);
 194                 if (ret)
 195                         return ret;
 196         }
 197
 198         return 0;
 199 }
 200
 201 #endif /* CONFIG_IS_ENABLED(PINCONF) */
 202
 203 static void uniphier_pinmux_set_one(struct udevice *dev, unsigned pin,
 204                                     int muxval)
 205 {
 206         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
 207         unsigned reg, reg_end, shift, mask;
 208         unsigned mux_bits = 8;
 209         unsigned reg_stride = 4;
 210         bool load_pinctrl = false;
 211         u32 tmp;
 212
 213         /* some pins need input-enabling */
 214         uniphier_pinconf_input_enable(dev, pin, 1);
 215
 216         if (muxval < 0)
 217                 return;         /* dedicated pin; nothing to do for pin-mux */
 218
 219         if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_MUX_4BIT)
 220                 mux_bits = 4;
 221
 222         if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_DBGMUX_SEPARATE) {
 223                 /*
 224                  *  Mode       offset        bit
 225                  *  Normal     4 * n     shift+3:shift
 226                  *  Debug      4 * n     shift+7:shift+4
 227                  */
 228                 mux_bits /= 2;
 229                 reg_stride = 8;
 230                 load_pinctrl = true;
 231         }
 232
 233         reg = UNIPHIER_PINCTRL_PINMUX_BASE + pin * mux_bits / 32 * reg_stride;
 234         reg_end = reg + reg_stride;
 235         shift = pin * mux_bits % 32;
 236         mask = (1U << mux_bits) - 1;
 237
 238         /*
 239          * If reg_stride is greater than 4, the MSB of each pinsel shall be
 240          * stored in the offset+4.
 241          */
 242         for (; reg < reg_end; reg += 4) {
 243                 tmp = readl(priv->base + reg);
 244                 tmp &= ~(mask << shift);
 245                 tmp |= (mask & muxval) << shift;
 246                 writel(tmp, priv->base + reg);
 247
 248                 muxval >>= mux_bits;
 249         }
 250
 251         if (load_pinctrl)
 252                 writel(1, priv->base + UNIPHIER_PINCTRL_LOAD_PINMUX);
 253 }
 254
 255 static int uniphier_pinmux_group_set(struct udevice *dev,
 256                                      unsigned group_selector,
 257                                      unsigned func_selector)
 258 {
 259         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
 260         const struct uniphier_pinctrl_group *grp =
 261                                         &priv->socdata->groups[group_selector];
 262         int i;
 263
 264         for (i = 0; i < grp->num_pins; i++)
 265                 uniphier_pinmux_set_one(dev, grp->pins[i], grp->muxvals[i]);
 266
 267         return 0;
 268 }
 269
 270 const struct pinctrl_ops uniphier_pinctrl_ops = {
 271         .get_groups_count = uniphier_pinctrl_get_groups_count,
 272         .get_group_name = uniphier_pinctrl_get_group_name,
 273         .get_functions_count = uniphier_pinmux_get_functions_count,
 274         .get_function_name = uniphier_pinmux_get_function_name,
 275         .pinmux_group_set = uniphier_pinmux_group_set,
 276 #if CONFIG_IS_ENABLED(PINCONF)
 277         .pinconf_num_params = ARRAY_SIZE(uniphier_pinconf_params),
 278         .pinconf_params = uniphier_pinconf_params,
 279         .pinconf_group_set = uniphier_pinconf_group_set,
 280 #endif
 281         .set_state = pinctrl_generic_set_state,
 282 };
 283
 284 int uniphier_pinctrl_probe(struct udevice *dev,
 285                            struct uniphier_pinctrl_socdata *socdata)
 286 {
 287         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
 288         fdt_addr_t addr;
 289
 290         addr = devfdt_get_addr(dev->parent);
 291         if (addr == FDT_ADDR_T_NONE)
 292                 return -EINVAL;
 293
 294         priv->base = devm_ioremap(dev, addr, SZ_4K);
 295         if (!priv->base)
 296                 return -ENOMEM;
 297
 298         priv->socdata = socdata;
 299
 300         return 0;
 301 }