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 <common.h> 9 #include <linux/io.h> 10 #include <linux/err.h> 11 #include <linux/sizes.h> 12 #include <dm/device.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 int pins_count = priv->socdata->pins_count; 85 const struct uniphier_pinctrl_pin *pins = priv->socdata->pins; 86 int i; 87 88 /* 89 * Multiple pins share one input enable, per-pin disabling is 90 * impossible. 91 */ 92 if (!enable) 93 return -EINVAL; 94 95 for (i = 0; i < pins_count; i++) { 96 if (pins[i].number == pin) { 97 unsigned int iectrl; 98 u32 tmp; 99 100 iectrl = uniphier_pin_get_iectrl(pins[i].data); 101 tmp = readl(priv->base + UNIPHIER_PINCTRL_IECTRL); 102 tmp |= 1 << iectrl; 103 writel(tmp, priv->base + UNIPHIER_PINCTRL_IECTRL); 104 } 105 } 106 107 return 0; 108 } 109 110 static int uniphier_pinconf_input_enable(struct udevice *dev, 111 unsigned int pin, int enable) 112 { 113 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev); 114 115 if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_PERPIN_IECTRL) 116 return uniphier_pinconf_input_enable_perpin(dev, pin, enable); 117 else 118 return uniphier_pinconf_input_enable_legacy(dev, pin, enable); 119 } 120 121 #if CONFIG_IS_ENABLED(PINCONF) 122 123 static const struct pinconf_param uniphier_pinconf_params[] = { 124 { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 }, 125 { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 }, 126 { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 }, 127 { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 }, 128 { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 }, 129 { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 }, 130 }; 131 132 static int uniphier_pinconf_bias_set(struct udevice *dev, unsigned int pin, 133 unsigned int param, unsigned int arg) 134 { 135 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev); 136 unsigned int enable = 1; 137 unsigned int reg; 138 u32 mask, tmp; 139 140 if (!(priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_PUPD_SIMPLE)) 141 return -ENOTSUPP; 142 143 switch (param) { 144 case PIN_CONFIG_BIAS_DISABLE: 145 enable = 0; 146 break; 147 case PIN_CONFIG_BIAS_PULL_UP: 148 case PIN_CONFIG_BIAS_PULL_DOWN: 149 if (arg == 0) /* total bias is not supported */ 150 return -EINVAL; 151 break; 152 case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT: 153 if (arg == 0) /* configuration ignored */ 154 return 0; 155 default: 156 BUG(); 157 } 158 159 reg = UNIPHIER_PINCTRL_PUPDCTRL_BASE + pin / 32 * 4; 160 mask = BIT(pin % 32); 161 162 tmp = readl(priv->base + reg); 163 if (enable) 164 tmp |= mask; 165 else 166 tmp &= ~mask; 167 writel(tmp, priv->base + reg); 168 169 return 0; 170 } 171 172 static int uniphier_pinconf_set_one(struct udevice *dev, unsigned int pin, 173 unsigned int param, unsigned int arg) 174 { 175 int ret; 176 177 switch (param) { 178 case PIN_CONFIG_BIAS_DISABLE: 179 case PIN_CONFIG_BIAS_PULL_UP: 180 case PIN_CONFIG_BIAS_PULL_DOWN: 181 case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT: 182 ret = uniphier_pinconf_bias_set(dev, pin, param, arg); 183 break; 184 case PIN_CONFIG_INPUT_ENABLE: 185 ret = uniphier_pinconf_input_enable(dev, pin, arg); 186 break; 187 default: 188 printf("unsupported configuration parameter %u\n", param); 189 return -EINVAL; 190 } 191 192 return ret; 193 } 194 195 static int uniphier_pinconf_group_set(struct udevice *dev, 196 unsigned int group_selector, 197 unsigned int param, unsigned int arg) 198 { 199 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev); 200 const struct uniphier_pinctrl_group *grp = 201 &priv->socdata->groups[group_selector]; 202 int i, ret; 203 204 for (i = 0; i < grp->num_pins; i++) { 205 ret = uniphier_pinconf_set_one(dev, grp->pins[i], param, arg); 206 if (ret) 207 return ret; 208 } 209 210 return 0; 211 } 212 213 #endif /* CONFIG_IS_ENABLED(PINCONF) */ 214 215 static void uniphier_pinmux_set_one(struct udevice *dev, unsigned pin, 216 int muxval) 217 { 218 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev); 219 unsigned reg, reg_end, shift, mask; 220 unsigned mux_bits = 8; 221 unsigned reg_stride = 4; 222 bool load_pinctrl = false; 223 u32 tmp; 224 225 /* some pins need input-enabling */ 226 uniphier_pinconf_input_enable(dev, pin, 1); 227 228 if (muxval < 0) 229 return; /* dedicated pin; nothing to do for pin-mux */ 230 231 if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_MUX_4BIT) 232 mux_bits = 4; 233 234 if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_DBGMUX_SEPARATE) { 235 /* 236 * Mode offset bit 237 * Normal 4 * n shift+3:shift 238 * Debug 4 * n shift+7:shift+4 239 */ 240 mux_bits /= 2; 241 reg_stride = 8; 242 load_pinctrl = true; 243 } 244 245 reg = UNIPHIER_PINCTRL_PINMUX_BASE + pin * mux_bits / 32 * reg_stride; 246 reg_end = reg + reg_stride; 247 shift = pin * mux_bits % 32; 248 mask = (1U << mux_bits) - 1; 249 250 /* 251 * If reg_stride is greater than 4, the MSB of each pinsel shall be 252 * stored in the offset+4. 253 */ 254 for (; reg < reg_end; reg += 4) { 255 tmp = readl(priv->base + reg); 256 tmp &= ~(mask << shift); 257 tmp |= (mask & muxval) << shift; 258 writel(tmp, priv->base + reg); 259 260 muxval >>= mux_bits; 261 } 262 263 if (load_pinctrl) 264 writel(1, priv->base + UNIPHIER_PINCTRL_LOAD_PINMUX); 265 } 266 267 static int uniphier_pinmux_group_set(struct udevice *dev, 268 unsigned group_selector, 269 unsigned func_selector) 270 { 271 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev); 272 const struct uniphier_pinctrl_group *grp = 273 &priv->socdata->groups[group_selector]; 274 int i; 275 276 for (i = 0; i < grp->num_pins; i++) 277 uniphier_pinmux_set_one(dev, grp->pins[i], grp->muxvals[i]); 278 279 return 0; 280 } 281 282 const struct pinctrl_ops uniphier_pinctrl_ops = { 283 .get_groups_count = uniphier_pinctrl_get_groups_count, 284 .get_group_name = uniphier_pinctrl_get_group_name, 285 .get_functions_count = uniphier_pinmux_get_functions_count, 286 .get_function_name = uniphier_pinmux_get_function_name, 287 .pinmux_group_set = uniphier_pinmux_group_set, 288 #if CONFIG_IS_ENABLED(PINCONF) 289 .pinconf_num_params = ARRAY_SIZE(uniphier_pinconf_params), 290 .pinconf_params = uniphier_pinconf_params, 291 .pinconf_group_set = uniphier_pinconf_group_set, 292 #endif 293 .set_state = pinctrl_generic_set_state, 294 }; 295 296 int uniphier_pinctrl_probe(struct udevice *dev, 297 struct uniphier_pinctrl_socdata *socdata) 298 { 299 struct uniphier_pinctrl_priv *priv = dev_get_priv(dev); 300 fdt_addr_t addr; 301 302 addr = dev_get_addr(dev->parent); 303 if (addr == FDT_ADDR_T_NONE) 304 return -EINVAL; 305 306 priv->base = devm_ioremap(dev, addr, SZ_4K); 307 if (!priv->base) 308 return -ENOMEM; 309 310 priv->socdata = socdata; 311 312 return 0; 313 } 314