/* * Copyright (C) 2015 Masahiro Yamada * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include #include #include #include #include #include #include #include #include "../core.h" #include "../pinctrl-utils.h" #include "pinctrl-uniphier.h" struct uniphier_pinctrl_priv { struct pinctrl_dev *pctldev; struct regmap *regmap; struct uniphier_pinctrl_socdata *socdata; }; static int uniphier_pctl_get_groups_count(struct pinctrl_dev *pctldev) { struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev); return priv->socdata->groups_count; } static const char *uniphier_pctl_get_group_name(struct pinctrl_dev *pctldev, unsigned selector) { struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev); return priv->socdata->groups[selector].name; } static int uniphier_pctl_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector, const unsigned **pins, unsigned *num_pins) { struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev); *pins = priv->socdata->groups[selector].pins; *num_pins = priv->socdata->groups[selector].num_pins; return 0; } #ifdef CONFIG_DEBUG_FS static void uniphier_pctl_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s, unsigned offset) { const struct pinctrl_pin_desc *pin = &pctldev->desc->pins[offset]; const char *pull_dir, *drv_str; switch (uniphier_pin_get_pull_dir(pin->drv_data)) { case UNIPHIER_PIN_PULL_UP: pull_dir = "UP"; break; case UNIPHIER_PIN_PULL_DOWN: pull_dir = "DOWN"; break; case UNIPHIER_PIN_PULL_UP_FIXED: pull_dir = "UP(FIXED)"; break; case UNIPHIER_PIN_PULL_DOWN_FIXED: pull_dir = "DOWN(FIXED)"; break; case UNIPHIER_PIN_PULL_NONE: pull_dir = "NONE"; break; default: BUG(); } switch (uniphier_pin_get_drv_str(pin->drv_data)) { case UNIPHIER_PIN_DRV_4_8: drv_str = "4/8(mA)"; break; case UNIPHIER_PIN_DRV_8_12_16_20: drv_str = "8/12/16/20(mA)"; break; case UNIPHIER_PIN_DRV_FIXED_4: drv_str = "4(mA)"; break; case UNIPHIER_PIN_DRV_FIXED_5: drv_str = "5(mA)"; break; case UNIPHIER_PIN_DRV_FIXED_8: drv_str = "8(mA)"; break; case UNIPHIER_PIN_DRV_NONE: drv_str = "NONE"; break; default: BUG(); } seq_printf(s, " PULL_DIR=%s DRV_STR=%s", pull_dir, drv_str); } #endif static const struct pinctrl_ops uniphier_pctlops = { .get_groups_count = uniphier_pctl_get_groups_count, .get_group_name = uniphier_pctl_get_group_name, .get_group_pins = uniphier_pctl_get_group_pins, #ifdef CONFIG_DEBUG_FS .pin_dbg_show = uniphier_pctl_pin_dbg_show, #endif .dt_node_to_map = pinconf_generic_dt_node_to_map_all, .dt_free_map = pinctrl_utils_free_map, }; static int uniphier_conf_pin_bias_get(struct pinctrl_dev *pctldev, const struct pinctrl_pin_desc *pin, enum pin_config_param param) { struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev); enum uniphier_pin_pull_dir pull_dir = uniphier_pin_get_pull_dir(pin->drv_data); unsigned int pupdctrl, reg, shift, val; unsigned int expected = 1; int ret; switch (param) { case PIN_CONFIG_BIAS_DISABLE: if (pull_dir == UNIPHIER_PIN_PULL_NONE) return 0; if (pull_dir == UNIPHIER_PIN_PULL_UP_FIXED || pull_dir == UNIPHIER_PIN_PULL_DOWN_FIXED) return -EINVAL; expected = 0; break; case PIN_CONFIG_BIAS_PULL_UP: if (pull_dir == UNIPHIER_PIN_PULL_UP_FIXED) return 0; if (pull_dir != UNIPHIER_PIN_PULL_UP) return -EINVAL; break; case PIN_CONFIG_BIAS_PULL_DOWN: if (pull_dir == UNIPHIER_PIN_PULL_DOWN_FIXED) return 0; if (pull_dir != UNIPHIER_PIN_PULL_DOWN) return -EINVAL; break; default: BUG(); } pupdctrl = uniphier_pin_get_pupdctrl(pin->drv_data); reg = UNIPHIER_PINCTRL_PUPDCTRL_BASE + pupdctrl / 32 * 4; shift = pupdctrl % 32; ret = regmap_read(priv->regmap, reg, &val); if (ret) return ret; val = (val >> shift) & 1; return (val == expected) ? 0 : -EINVAL; } static int uniphier_conf_pin_drive_get(struct pinctrl_dev *pctldev, const struct pinctrl_pin_desc *pin, u16 *strength) { struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev); enum uniphier_pin_drv_str drv_str = uniphier_pin_get_drv_str(pin->drv_data); const unsigned int strength_4_8[] = {4, 8}; const unsigned int strength_8_12_16_20[] = {8, 12, 16, 20}; const unsigned int *supported_strength; unsigned int drvctrl, reg, shift, mask, width, val; int ret; switch (drv_str) { case UNIPHIER_PIN_DRV_4_8: supported_strength = strength_4_8; width = 1; break; case UNIPHIER_PIN_DRV_8_12_16_20: supported_strength = strength_8_12_16_20; width = 2; break; case UNIPHIER_PIN_DRV_FIXED_4: *strength = 4; return 0; case UNIPHIER_PIN_DRV_FIXED_5: *strength = 5; return 0; case UNIPHIER_PIN_DRV_FIXED_8: *strength = 8; return 0; default: /* drive strength control is not supported for this pin */ return -EINVAL; } drvctrl = uniphier_pin_get_drvctrl(pin->drv_data); drvctrl *= width; reg = (width == 2) ? UNIPHIER_PINCTRL_DRV2CTRL_BASE : UNIPHIER_PINCTRL_DRVCTRL_BASE; reg += drvctrl / 32 * 4; shift = drvctrl % 32; mask = (1U << width) - 1; ret = regmap_read(priv->regmap, reg, &val); if (ret) return ret; *strength = supported_strength[(val >> shift) & mask]; return 0; } static int uniphier_conf_pin_input_enable_get(struct pinctrl_dev *pctldev, const struct pinctrl_pin_desc *pin) { struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev); unsigned int iectrl = uniphier_pin_get_iectrl(pin->drv_data); unsigned int val; int ret; if (iectrl == UNIPHIER_PIN_IECTRL_NONE) /* This pin is always input-enabled. */ return 0; ret = regmap_read(priv->regmap, UNIPHIER_PINCTRL_IECTRL, &val); if (ret) return ret; return val & BIT(iectrl) ? 0 : -EINVAL; } static int uniphier_conf_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin, unsigned long *configs) { const struct pinctrl_pin_desc *pin_desc = &pctldev->desc->pins[pin]; enum pin_config_param param = pinconf_to_config_param(*configs); bool has_arg = false; u16 arg; int ret; switch (param) { case PIN_CONFIG_BIAS_DISABLE: case PIN_CONFIG_BIAS_PULL_UP: case PIN_CONFIG_BIAS_PULL_DOWN: ret = uniphier_conf_pin_bias_get(pctldev, pin_desc, param); break; case PIN_CONFIG_DRIVE_STRENGTH: ret = uniphier_conf_pin_drive_get(pctldev, pin_desc, &arg); has_arg = true; break; case PIN_CONFIG_INPUT_ENABLE: ret = uniphier_conf_pin_input_enable_get(pctldev, pin_desc); break; default: /* unsupported parameter */ ret = -EINVAL; break; } if (ret == 0 && has_arg) *configs = pinconf_to_config_packed(param, arg); return ret; } static int uniphier_conf_pin_bias_set(struct pinctrl_dev *pctldev, const struct pinctrl_pin_desc *pin, enum pin_config_param param, u16 arg) { struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev); enum uniphier_pin_pull_dir pull_dir = uniphier_pin_get_pull_dir(pin->drv_data); unsigned int pupdctrl, reg, shift; unsigned int val = 1; switch (param) { case PIN_CONFIG_BIAS_DISABLE: if (pull_dir == UNIPHIER_PIN_PULL_NONE) return 0; if (pull_dir == UNIPHIER_PIN_PULL_UP_FIXED || pull_dir == UNIPHIER_PIN_PULL_DOWN_FIXED) { dev_err(pctldev->dev, "can not disable pull register for pin %u (%s)\n", pin->number, pin->name); return -EINVAL; } val = 0; break; case PIN_CONFIG_BIAS_PULL_UP: if (pull_dir == UNIPHIER_PIN_PULL_UP_FIXED && arg != 0) return 0; if (pull_dir != UNIPHIER_PIN_PULL_UP) { dev_err(pctldev->dev, "pull-up is unsupported for pin %u (%s)\n", pin->number, pin->name); return -EINVAL; } if (arg == 0) { dev_err(pctldev->dev, "pull-up can not be total\n"); return -EINVAL; } break; case PIN_CONFIG_BIAS_PULL_DOWN: if (pull_dir == UNIPHIER_PIN_PULL_DOWN_FIXED && arg != 0) return 0; if (pull_dir != UNIPHIER_PIN_PULL_DOWN) { dev_err(pctldev->dev, "pull-down is unsupported for pin %u (%s)\n", pin->number, pin->name); return -EINVAL; } if (arg == 0) { dev_err(pctldev->dev, "pull-down can not be total\n"); return -EINVAL; } break; case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT: if (pull_dir == UNIPHIER_PIN_PULL_NONE) { dev_err(pctldev->dev, "pull-up/down is unsupported for pin %u (%s)\n", pin->number, pin->name); return -EINVAL; } if (arg == 0) return 0; /* configuration ingored */ break; default: BUG(); } pupdctrl = uniphier_pin_get_pupdctrl(pin->drv_data); reg = UNIPHIER_PINCTRL_PUPDCTRL_BASE + pupdctrl / 32 * 4; shift = pupdctrl % 32; return regmap_update_bits(priv->regmap, reg, 1 << shift, val << shift); } static int uniphier_conf_pin_drive_set(struct pinctrl_dev *pctldev, const struct pinctrl_pin_desc *pin, u16 strength) { struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev); enum uniphier_pin_drv_str drv_str = uniphier_pin_get_drv_str(pin->drv_data); const unsigned int strength_4_8[] = {4, 8, -1}; const unsigned int strength_8_12_16_20[] = {8, 12, 16, 20, -1}; const unsigned int *supported_strength; unsigned int drvctrl, reg, shift, mask, width, val; switch (drv_str) { case UNIPHIER_PIN_DRV_4_8: supported_strength = strength_4_8; width = 1; break; case UNIPHIER_PIN_DRV_8_12_16_20: supported_strength = strength_8_12_16_20; width = 2; break; default: dev_err(pctldev->dev, "cannot change drive strength for pin %u (%s)\n", pin->number, pin->name); return -EINVAL; } for (val = 0; supported_strength[val] > 0; val++) { if (supported_strength[val] > strength) break; } if (val == 0) { dev_err(pctldev->dev, "unsupported drive strength %u mA for pin %u (%s)\n", strength, pin->number, pin->name); return -EINVAL; } val--; drvctrl = uniphier_pin_get_drvctrl(pin->drv_data); drvctrl *= width; reg = (width == 2) ? UNIPHIER_PINCTRL_DRV2CTRL_BASE : UNIPHIER_PINCTRL_DRVCTRL_BASE; reg += drvctrl / 32 * 4; shift = drvctrl % 32; mask = (1U << width) - 1; return regmap_update_bits(priv->regmap, reg, mask << shift, val << shift); } static int uniphier_conf_pin_input_enable(struct pinctrl_dev *pctldev, const struct pinctrl_pin_desc *pin, u16 enable) { struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev); unsigned int iectrl = uniphier_pin_get_iectrl(pin->drv_data); if (enable == 0) { /* * Multiple pins share one input enable, so per-pin disabling * is impossible. */ dev_err(pctldev->dev, "unable to disable input\n"); return -EINVAL; } if (iectrl == UNIPHIER_PIN_IECTRL_NONE) /* This pin is always input-enabled. nothing to do. */ return 0; return regmap_update_bits(priv->regmap, UNIPHIER_PINCTRL_IECTRL, BIT(iectrl), BIT(iectrl)); } static int uniphier_conf_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin, unsigned long *configs, unsigned num_configs) { const struct pinctrl_pin_desc *pin_desc = &pctldev->desc->pins[pin]; int i, ret; for (i = 0; i < num_configs; i++) { enum pin_config_param param = pinconf_to_config_param(configs[i]); u16 arg = pinconf_to_config_argument(configs[i]); switch (param) { case PIN_CONFIG_BIAS_DISABLE: case PIN_CONFIG_BIAS_PULL_UP: case PIN_CONFIG_BIAS_PULL_DOWN: case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT: ret = uniphier_conf_pin_bias_set(pctldev, pin_desc, param, arg); break; case PIN_CONFIG_DRIVE_STRENGTH: ret = uniphier_conf_pin_drive_set(pctldev, pin_desc, arg); break; case PIN_CONFIG_INPUT_ENABLE: ret = uniphier_conf_pin_input_enable(pctldev, pin_desc, arg); break; default: dev_err(pctldev->dev, "unsupported configuration parameter %u\n", param); return -EINVAL; } if (ret) return ret; } return 0; } static int uniphier_conf_pin_config_group_set(struct pinctrl_dev *pctldev, unsigned selector, unsigned long *configs, unsigned num_configs) { struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev); const unsigned *pins = priv->socdata->groups[selector].pins; unsigned num_pins = priv->socdata->groups[selector].num_pins; int i, ret; for (i = 0; i < num_pins; i++) { ret = uniphier_conf_pin_config_set(pctldev, pins[i], configs, num_configs); if (ret) return ret; } return 0; } static const struct pinconf_ops uniphier_confops = { .is_generic = true, .pin_config_get = uniphier_conf_pin_config_get, .pin_config_set = uniphier_conf_pin_config_set, .pin_config_group_set = uniphier_conf_pin_config_group_set, }; static int uniphier_pmx_get_functions_count(struct pinctrl_dev *pctldev) { struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev); return priv->socdata->functions_count; } static const char *uniphier_pmx_get_function_name(struct pinctrl_dev *pctldev, unsigned selector) { struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev); return priv->socdata->functions[selector].name; } static int uniphier_pmx_get_function_groups(struct pinctrl_dev *pctldev, unsigned selector, const char * const **groups, unsigned *num_groups) { struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev); *groups = priv->socdata->functions[selector].groups; *num_groups = priv->socdata->functions[selector].num_groups; return 0; } static int uniphier_pmx_set_one_mux(struct pinctrl_dev *pctldev, unsigned pin, unsigned muxval) { struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev); unsigned mux_bits = priv->socdata->mux_bits; unsigned reg_stride = priv->socdata->reg_stride; unsigned reg, reg_end, shift, mask; int ret; /* some pins need input-enabling */ ret = uniphier_conf_pin_input_enable(pctldev, &pctldev->desc->pins[pin], 1); if (ret) return ret; reg = UNIPHIER_PINCTRL_PINMUX_BASE + pin * mux_bits / 32 * reg_stride; reg_end = reg + reg_stride; shift = pin * mux_bits % 32; mask = (1U << mux_bits) - 1; /* * If reg_stride is greater than 4, the MSB of each pinsel shall be * stored in the offset+4. */ for (; reg < reg_end; reg += 4) { ret = regmap_update_bits(priv->regmap, reg, mask << shift, muxval << shift); if (ret) return ret; muxval >>= mux_bits; } if (priv->socdata->load_pinctrl) { ret = regmap_write(priv->regmap, UNIPHIER_PINCTRL_LOAD_PINMUX, 1); if (ret) return ret; } return 0; } static int uniphier_pmx_set_mux(struct pinctrl_dev *pctldev, unsigned func_selector, unsigned group_selector) { struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev); const struct uniphier_pinctrl_group *grp = &priv->socdata->groups[group_selector]; int i; int ret; for (i = 0; i < grp->num_pins; i++) { ret = uniphier_pmx_set_one_mux(pctldev, grp->pins[i], grp->muxvals[i]); if (ret) return ret; } return 0; } static int uniphier_pmx_gpio_request_enable(struct pinctrl_dev *pctldev, struct pinctrl_gpio_range *range, unsigned offset) { struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev); const struct uniphier_pinctrl_group *groups = priv->socdata->groups; int groups_count = priv->socdata->groups_count; enum uniphier_pinmux_gpio_range_type range_type; int i, j; if (strstr(range->name, "irq")) range_type = UNIPHIER_PINMUX_GPIO_RANGE_IRQ; else range_type = UNIPHIER_PINMUX_GPIO_RANGE_PORT; for (i = 0; i < groups_count; i++) { if (groups[i].range_type != range_type) continue; for (j = 0; j < groups[i].num_pins; j++) if (groups[i].pins[j] == offset) goto found; } dev_err(pctldev->dev, "pin %u does not support GPIO\n", offset); return -EINVAL; found: return uniphier_pmx_set_one_mux(pctldev, offset, groups[i].muxvals[j]); } static const struct pinmux_ops uniphier_pmxops = { .get_functions_count = uniphier_pmx_get_functions_count, .get_function_name = uniphier_pmx_get_function_name, .get_function_groups = uniphier_pmx_get_function_groups, .set_mux = uniphier_pmx_set_mux, .gpio_request_enable = uniphier_pmx_gpio_request_enable, .strict = true, }; int uniphier_pinctrl_probe(struct platform_device *pdev, struct pinctrl_desc *desc, struct uniphier_pinctrl_socdata *socdata) { struct device *dev = &pdev->dev; struct uniphier_pinctrl_priv *priv; if (!socdata || !socdata->groups || !socdata->groups_count || !socdata->functions || !socdata->functions_count || !socdata->mux_bits || !socdata->reg_stride) { dev_err(dev, "pinctrl socdata lacks necessary members\n"); return -EINVAL; } priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; priv->regmap = syscon_node_to_regmap(dev->of_node); if (IS_ERR(priv->regmap)) { dev_err(dev, "failed to get regmap\n"); return PTR_ERR(priv->regmap); } priv->socdata = socdata; desc->name = dev->driver->name; desc->pctlops = &uniphier_pctlops; desc->pmxops = &uniphier_pmxops; desc->confops = &uniphier_confops; desc->owner = dev->driver->owner; priv->pctldev = devm_pinctrl_register(dev, desc, priv); if (IS_ERR(priv->pctldev)) { dev_err(dev, "failed to register UniPhier pinctrl driver\n"); return PTR_ERR(priv->pctldev); } platform_set_drvdata(pdev, priv); return 0; } EXPORT_SYMBOL_GPL(uniphier_pinctrl_probe);