git.sur5r.net Git - u-boot/blob - drivers/pinctrl/uniphier/pinctrl-uniphier-core.c

   1 /*
   2  * Copyright (C) 2015-2016 Socionext Inc.
   3  *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <linux/io.h>
   9 #include <linux/err.h>
  10 #include <linux/sizes.h>
  11 #include <dm/device.h>
  12 #include <dm/pinctrl.h>
  13
  14 #include "pinctrl-uniphier.h"
  15
  16 #define UNIPHIER_PINCTRL_PINMUX_BASE    0x1000
  17 #define UNIPHIER_PINCTRL_LOAD_PINMUX    0x1700
  18 #define UNIPHIER_PINCTRL_IECTRL         0x1d00
  19
  20 static const char *uniphier_pinctrl_dummy_name = "_dummy";
  21
  22 static int uniphier_pinctrl_get_groups_count(struct udevice *dev)
  23 {
  24         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  25
  26         return priv->socdata->groups_count;
  27 }
  28
  29 static const char *uniphier_pinctrl_get_group_name(struct udevice *dev,
  30                                                    unsigned selector)
  31 {
  32         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  33
  34         if (!priv->socdata->groups[selector].name)
  35                 return uniphier_pinctrl_dummy_name;
  36
  37         return priv->socdata->groups[selector].name;
  38 }
  39
  40 static int uniphier_pinmux_get_functions_count(struct udevice *dev)
  41 {
  42         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  43
  44         return priv->socdata->functions_count;
  45 }
  46
  47 static const char *uniphier_pinmux_get_function_name(struct udevice *dev,
  48                                                      unsigned selector)
  49 {
  50         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  51
  52         if (!priv->socdata->functions[selector])
  53                 return uniphier_pinctrl_dummy_name;
  54
  55         return priv->socdata->functions[selector];
  56 }
  57
  58 static void uniphier_pinconf_input_enable_perpin(struct udevice *dev,
  59                                                  unsigned pin)
  60 {
  61         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  62         unsigned reg;
  63         u32 mask, tmp;
  64
  65         reg = UNIPHIER_PINCTRL_IECTRL + pin / 32 * 4;
  66         mask = BIT(pin % 32);
  67
  68         tmp = readl(priv->base + reg);
  69         tmp |= mask;
  70         writel(tmp, priv->base + reg);
  71 }
  72
  73 static void uniphier_pinconf_input_enable_legacy(struct udevice *dev,
  74                                                  unsigned pin)
  75 {
  76         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  77         int pins_count = priv->socdata->pins_count;
  78         const struct uniphier_pinctrl_pin *pins = priv->socdata->pins;
  79         int i;
  80
  81         for (i = 0; i < pins_count; i++) {
  82                 if (pins[i].number == pin) {
  83                         unsigned int iectrl;
  84                         u32 tmp;
  85
  86                         iectrl = uniphier_pin_get_iectrl(pins[i].data);
  87                         tmp = readl(priv->base + UNIPHIER_PINCTRL_IECTRL);
  88                         tmp |= 1 << iectrl;
  89                         writel(tmp, priv->base + UNIPHIER_PINCTRL_IECTRL);
  90                 }
  91         }
  92 }
  93
  94 static void uniphier_pinconf_input_enable(struct udevice *dev, unsigned pin)
  95 {
  96         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
  97
  98         if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_PERPIN_IECTRL)
  99                 uniphier_pinconf_input_enable_perpin(dev, pin);
 100         else
 101                 uniphier_pinconf_input_enable_legacy(dev, pin);
 102 }
 103
 104 static void uniphier_pinmux_set_one(struct udevice *dev, unsigned pin,
 105                                     int muxval)
 106 {
 107         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
 108         unsigned reg, reg_end, shift, mask;
 109         unsigned mux_bits = 8;
 110         unsigned reg_stride = 4;
 111         bool load_pinctrl = false;
 112         u32 tmp;
 113
 114         /* some pins need input-enabling */
 115         uniphier_pinconf_input_enable(dev, pin);
 116
 117         if (muxval < 0)
 118                 return;         /* dedicated pin; nothing to do for pin-mux */
 119
 120         if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_MUX_4BIT)
 121                 mux_bits = 4;
 122
 123         if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_DBGMUX_SEPARATE) {
 124                 /*
 125                  *  Mode       offset        bit
 126                  *  Normal     4 * n     shift+3:shift
 127                  *  Debug      4 * n     shift+7:shift+4
 128                  */
 129                 mux_bits /= 2;
 130                 reg_stride = 8;
 131                 load_pinctrl = true;
 132         }
 133
 134         reg = UNIPHIER_PINCTRL_PINMUX_BASE + pin * mux_bits / 32 * reg_stride;
 135         reg_end = reg + reg_stride;
 136         shift = pin * mux_bits % 32;
 137         mask = (1U << mux_bits) - 1;
 138
 139         /*
 140          * If reg_stride is greater than 4, the MSB of each pinsel shall be
 141          * stored in the offset+4.
 142          */
 143         for (; reg < reg_end; reg += 4) {
 144                 tmp = readl(priv->base + reg);
 145                 tmp &= ~(mask << shift);
 146                 tmp |= (mask & muxval) << shift;
 147                 writel(tmp, priv->base + reg);
 148
 149                 muxval >>= mux_bits;
 150         }
 151
 152         if (load_pinctrl)
 153                 writel(1, priv->base + UNIPHIER_PINCTRL_LOAD_PINMUX);
 154 }
 155
 156 static int uniphier_pinmux_group_set(struct udevice *dev,
 157                                      unsigned group_selector,
 158                                      unsigned func_selector)
 159 {
 160         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
 161         const struct uniphier_pinctrl_group *grp =
 162                                         &priv->socdata->groups[group_selector];
 163         int i;
 164
 165         for (i = 0; i < grp->num_pins; i++)
 166                 uniphier_pinmux_set_one(dev, grp->pins[i], grp->muxvals[i]);
 167
 168         return 0;
 169 }
 170
 171 const struct pinctrl_ops uniphier_pinctrl_ops = {
 172         .get_groups_count = uniphier_pinctrl_get_groups_count,
 173         .get_group_name = uniphier_pinctrl_get_group_name,
 174         .get_functions_count = uniphier_pinmux_get_functions_count,
 175         .get_function_name = uniphier_pinmux_get_function_name,
 176         .pinmux_group_set = uniphier_pinmux_group_set,
 177         .set_state = pinctrl_generic_set_state,
 178 };
 179
 180 int uniphier_pinctrl_probe(struct udevice *dev,
 181                            struct uniphier_pinctrl_socdata *socdata)
 182 {
 183         struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
 184         fdt_addr_t addr;
 185
 186         addr = dev_get_addr(dev->parent);
 187         if (addr == FDT_ADDR_T_NONE)
 188                 return -EINVAL;
 189
 190         priv->base = devm_ioremap(dev, addr, SZ_4K);
 191         if (!priv->base)
 192                 return -ENOMEM;
 193
 194         priv->socdata = socdata;
 195
 196         return 0;
 197 }