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_pins_count(struct udevice *dev)
  25 {
  26         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  27         const struct uniphier_pinctrl_pin *pins = priv->socdata->pins;
  28         int pins_count = priv->socdata->pins_count;
  29
  30         /*
  31          * We do not list all pins in the pin table to save memory footprint.
  32          * Report the max pin number + 1 to fake the framework.
  33          */
  34         return pins[pins_count - 1].number + 1;
  35 }
  36
  37 static const char *uniphier_pinctrl_get_pin_name(struct udevice *dev,
  38                                                  unsigned int selector)
  39 {
  40         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  41         const struct uniphier_pinctrl_pin *pins = priv->socdata->pins;
  42         int pins_count = priv->socdata->pins_count;
  43         int i;
  44
  45         for (i = 0; i < pins_count; i++)
  46                 if (pins[i].number == selector)
  47                         return pins[i].name;
  48
  49         return uniphier_pinctrl_dummy_name;
  50 }
  51
  52 static int uniphier_pinctrl_get_groups_count(struct udevice *dev)
  53 {
  54         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  55
  56         return priv->socdata->groups_count;
  57 }
  58
  59 static const char *uniphier_pinctrl_get_group_name(struct udevice *dev,
  60                                                    unsigned selector)
  61 {
  62         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  63
  64         if (!priv->socdata->groups[selector].name)
  65                 return uniphier_pinctrl_dummy_name;
  66
  67         return priv->socdata->groups[selector].name;
  68 }
  69
  70 static int uniphier_pinmux_get_functions_count(struct udevice *dev)
  71 {
  72         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  73
  74         return priv->socdata->functions_count;
  75 }
  76
  77 static const char *uniphier_pinmux_get_function_name(struct udevice *dev,
  78                                                      unsigned selector)
  79 {
  80         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  81
  82         if (!priv->socdata->functions[selector])
  83                 return uniphier_pinctrl_dummy_name;
  84
  85         return priv->socdata->functions[selector];
  86 }
  87
  88 static int uniphier_pinconf_input_enable_perpin(struct udevice *dev,
  89                                                 unsigned int pin, int enable)
  90 {
  91         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  92         unsigned reg;
  93         u32 mask, tmp;
  94
  95         reg = UNIPHIER_PINCTRL_IECTRL + pin / 32 * 4;
  96         mask = BIT(pin % 32);
  97
  98         tmp = readl(priv->base + reg);
  99         if (enable)
 100                 tmp |= mask;
 101         else
 102                 tmp &= ~mask;
 103         writel(tmp, priv->base + reg);
 104
 105         return 0;
 106 }
 107
 108 static int uniphier_pinconf_input_enable_legacy(struct udevice *dev,
 109                                                 unsigned int pin, int enable)
 110 {
 111         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
 112
 113         /*
 114          * Multiple pins share one input enable, per-pin disabling is
 115          * impossible.
 116          */
 117         if (!enable)
 118                 return -EINVAL;
 119
 120         /* Set all bits instead of having a bunch of pin data */
 121         writel(U32_MAX, priv->base + UNIPHIER_PINCTRL_IECTRL);
 122
 123         return 0;
 124 }
 125
 126 static int uniphier_pinconf_input_enable(struct udevice *dev,
 127                                          unsigned int pin, int enable)
 128 {
 129         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
 130
 131         if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_PERPIN_IECTRL)
 132                 return uniphier_pinconf_input_enable_perpin(dev, pin, enable);
 133         else
 134                 return uniphier_pinconf_input_enable_legacy(dev, pin, enable);
 135 }
 136
 137 #if CONFIG_IS_ENABLED(PINCONF)
 138
 139 static const struct pinconf_param uniphier_pinconf_params[] = {
 140         { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
 141         { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
 142         { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
 143         { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
 144         { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
 145         { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
 146 };
 147
 148 static int uniphier_pinconf_bias_set(struct udevice *dev, unsigned int pin,
 149                                      unsigned int param, unsigned int arg)
 150 {
 151         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
 152         unsigned int enable = 1;
 153         unsigned int reg;
 154         u32 mask, tmp;
 155
 156         if (!(priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_PUPD_SIMPLE))
 157                 return -ENOTSUPP;
 158
 159         switch (param) {
 160         case PIN_CONFIG_BIAS_DISABLE:
 161                 enable = 0;
 162                 break;
 163         case PIN_CONFIG_BIAS_PULL_UP:
 164         case PIN_CONFIG_BIAS_PULL_DOWN:
 165                 if (arg == 0)   /* total bias is not supported */
 166                         return -EINVAL;
 167                 break;
 168         case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
 169                 if (arg == 0)   /* configuration ignored */
 170                         return 0;
 171         default:
 172                 BUG();
 173         }
 174
 175         reg = UNIPHIER_PINCTRL_PUPDCTRL_BASE + pin / 32 * 4;
 176         mask = BIT(pin % 32);
 177
 178         tmp = readl(priv->base + reg);
 179         if (enable)
 180                 tmp |= mask;
 181         else
 182                 tmp &= ~mask;
 183         writel(tmp, priv->base + reg);
 184
 185         return 0;
 186 }
 187
 188 static int uniphier_pinconf_set(struct udevice *dev, unsigned int pin,
 189                                 unsigned int param, unsigned int arg)
 190 {
 191         int ret;
 192
 193         switch (param) {
 194         case PIN_CONFIG_BIAS_DISABLE:
 195         case PIN_CONFIG_BIAS_PULL_UP:
 196         case PIN_CONFIG_BIAS_PULL_DOWN:
 197         case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
 198                 ret = uniphier_pinconf_bias_set(dev, pin, param, arg);
 199                 break;
 200         case PIN_CONFIG_INPUT_ENABLE:
 201                 ret = uniphier_pinconf_input_enable(dev, pin, arg);
 202                 break;
 203         default:
 204                 dev_err(dev, "unsupported configuration parameter %u\n", param);
 205                 return -EINVAL;
 206         }
 207
 208         return ret;
 209 }
 210
 211 static int uniphier_pinconf_group_set(struct udevice *dev,
 212                                       unsigned int group_selector,
 213                                       unsigned int param, unsigned int arg)
 214 {
 215         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
 216         const struct uniphier_pinctrl_group *grp =
 217                                         &priv->socdata->groups[group_selector];
 218         int i, ret;
 219
 220         for (i = 0; i < grp->num_pins; i++) {
 221                 ret = uniphier_pinconf_set(dev, grp->pins[i], param, arg);
 222                 if (ret)
 223                         return ret;
 224         }
 225
 226         return 0;
 227 }
 228
 229 #endif /* CONFIG_IS_ENABLED(PINCONF) */
 230
 231 static void uniphier_pinmux_set_one(struct udevice *dev, unsigned pin,
 232                                     int muxval)
 233 {
 234         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
 235         unsigned reg, reg_end, shift, mask;
 236         unsigned mux_bits = 8;
 237         unsigned reg_stride = 4;
 238         bool load_pinctrl = false;
 239         u32 tmp;
 240
 241         /* some pins need input-enabling */
 242         uniphier_pinconf_input_enable(dev, pin, 1);
 243
 244         if (muxval < 0)
 245                 return;         /* dedicated pin; nothing to do for pin-mux */
 246
 247         if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_MUX_4BIT)
 248                 mux_bits = 4;
 249
 250         if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_DBGMUX_SEPARATE) {
 251                 /*
 252                  *  Mode       offset        bit
 253                  *  Normal     4 * n     shift+3:shift
 254                  *  Debug      4 * n     shift+7:shift+4
 255                  */
 256                 mux_bits /= 2;
 257                 reg_stride = 8;
 258                 load_pinctrl = true;
 259         }
 260
 261         reg = UNIPHIER_PINCTRL_PINMUX_BASE + pin * mux_bits / 32 * reg_stride;
 262         reg_end = reg + reg_stride;
 263         shift = pin * mux_bits % 32;
 264         mask = (1U << mux_bits) - 1;
 265
 266         /*
 267          * If reg_stride is greater than 4, the MSB of each pinsel shall be
 268          * stored in the offset+4.
 269          */
 270         for (; reg < reg_end; reg += 4) {
 271                 tmp = readl(priv->base + reg);
 272                 tmp &= ~(mask << shift);
 273                 tmp |= (mask & muxval) << shift;
 274                 writel(tmp, priv->base + reg);
 275
 276                 muxval >>= mux_bits;
 277         }
 278
 279         if (load_pinctrl)
 280                 writel(1, priv->base + UNIPHIER_PINCTRL_LOAD_PINMUX);
 281 }
 282
 283 static int uniphier_pinmux_group_set(struct udevice *dev,
 284                                      unsigned group_selector,
 285                                      unsigned func_selector)
 286 {
 287         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
 288         const struct uniphier_pinctrl_group *grp =
 289                                         &priv->socdata->groups[group_selector];
 290         int i;
 291
 292         for (i = 0; i < grp->num_pins; i++)
 293                 uniphier_pinmux_set_one(dev, grp->pins[i], grp->muxvals[i]);
 294
 295         return 0;
 296 }
 297
 298 const struct pinctrl_ops uniphier_pinctrl_ops = {
 299         .get_pins_count = uniphier_pinctrl_get_pins_count,
 300         .get_pin_name = uniphier_pinctrl_get_pin_name,
 301         .get_groups_count = uniphier_pinctrl_get_groups_count,
 302         .get_group_name = uniphier_pinctrl_get_group_name,
 303         .get_functions_count = uniphier_pinmux_get_functions_count,
 304         .get_function_name = uniphier_pinmux_get_function_name,
 305         .pinmux_group_set = uniphier_pinmux_group_set,
 306 #if CONFIG_IS_ENABLED(PINCONF)
 307         .pinconf_num_params = ARRAY_SIZE(uniphier_pinconf_params),
 308         .pinconf_params = uniphier_pinconf_params,
 309         .pinconf_set = uniphier_pinconf_set,
 310         .pinconf_group_set = uniphier_pinconf_group_set,
 311 #endif
 312         .set_state = pinctrl_generic_set_state,
 313 };
 314
 315 int uniphier_pinctrl_probe(struct udevice *dev,
 316                            struct uniphier_pinctrl_socdata *socdata)
 317 {
 318         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
 319         fdt_addr_t addr;
 320
 321         addr = devfdt_get_addr(dev->parent);
 322         if (addr == FDT_ADDR_T_NONE)
 323                 return -EINVAL;
 324
 325         priv->base = devm_ioremap(dev, addr, SZ_4K);
 326         if (!priv->base)
 327                 return -ENOMEM;
 328
 329         priv->socdata = socdata;
 330
 331         return 0;
 332 }