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 } 302