diff options
Diffstat (limited to 'drivers/pinctrl/sh-pfc/pinctrl.c')
-rw-r--r-- | drivers/pinctrl/sh-pfc/pinctrl.c | 124 |
1 files changed, 112 insertions, 12 deletions
diff --git a/drivers/pinctrl/sh-pfc/pinctrl.c b/drivers/pinctrl/sh-pfc/pinctrl.c index 87b0a59..fdb445d 100644 --- a/drivers/pinctrl/sh-pfc/pinctrl.c +++ b/drivers/pinctrl/sh-pfc/pinctrl.c @@ -476,6 +476,91 @@ static const struct pinmux_ops sh_pfc_pinmux_ops = { .gpio_set_direction = sh_pfc_gpio_set_direction, }; +static u32 sh_pfc_pinconf_find_drive_strength_reg(struct sh_pfc *pfc, + unsigned int pin, unsigned int *offset, unsigned int *size) +{ + const struct pinmux_drive_reg_field *field; + const struct pinmux_drive_reg *reg; + unsigned int i; + + for (reg = pfc->info->drive_regs; reg->reg; ++reg) { + for (i = 0; i < ARRAY_SIZE(reg->fields); ++i) { + field = ®->fields[i]; + + if (field->size && field->pin == pin) { + *offset = field->offset; + *size = field->size; + + return reg->reg; + } + } + } + + return 0; +} + +static int sh_pfc_pinconf_get_drive_strength(struct sh_pfc *pfc, + unsigned int pin) +{ + unsigned long flags; + unsigned int offset; + unsigned int size; + u32 reg; + u32 val; + + reg = sh_pfc_pinconf_find_drive_strength_reg(pfc, pin, &offset, &size); + if (!reg) + return -EINVAL; + + spin_lock_irqsave(&pfc->lock, flags); + val = sh_pfc_read_reg(pfc, reg, 32); + spin_unlock_irqrestore(&pfc->lock, flags); + + val = (val >> offset) & GENMASK(size - 1, 0); + + /* Convert the value to mA based on a full drive strength value of 24mA. + * We can make the full value configurable later if needed. + */ + return (val + 1) * (size == 2 ? 6 : 3); +} + +static int sh_pfc_pinconf_set_drive_strength(struct sh_pfc *pfc, + unsigned int pin, u16 strength) +{ + unsigned long flags; + unsigned int offset; + unsigned int size; + unsigned int step; + u32 reg; + u32 val; + + reg = sh_pfc_pinconf_find_drive_strength_reg(pfc, pin, &offset, &size); + if (!reg) + return -EINVAL; + + step = size == 2 ? 6 : 3; + + if (strength < step || strength > 24) + return -EINVAL; + + /* Convert the value from mA based on a full drive strength value of + * 24mA. We can make the full value configurable later if needed. + */ + strength = strength / step - 1; + + spin_lock_irqsave(&pfc->lock, flags); + + val = sh_pfc_read_reg(pfc, reg, 32); + val &= ~GENMASK(offset + size - 1, offset); + val |= strength << offset; + + sh_pfc_write_reg(pfc, reg, 32, val); + + spin_unlock_irqrestore(&pfc->lock, flags); + + return 0; +} + /* Check whether the requested parameter is supported for a pin. */ static bool sh_pfc_pinconf_validate(struct sh_pfc *pfc, unsigned int _pin, enum pin_config_param param) @@ -493,6 +578,9 @@ static bool sh_pfc_pinconf_validate(struct sh_pfc *pfc, unsigned int _pin, case PIN_CONFIG_BIAS_PULL_DOWN: return pin->configs & SH_PFC_PIN_CFG_PULL_DOWN; + case PIN_CONFIG_DRIVE_STRENGTH: + return pin->configs & SH_PFC_PIN_CFG_DRIVE_STRENGTH; + case PIN_CONFIG_POWER_SOURCE: return pin->configs & SH_PFC_PIN_CFG_IO_VOLTAGE; @@ -532,6 +620,17 @@ static int sh_pfc_pinconf_get(struct pinctrl_dev *pctldev, unsigned _pin, break; } + case PIN_CONFIG_DRIVE_STRENGTH: { + int ret; + + ret = sh_pfc_pinconf_get_drive_strength(pfc, _pin); + if (ret < 0) + return ret; + + *config = ret; + break; + } + case PIN_CONFIG_POWER_SOURCE: { int ret; @@ -584,6 +683,18 @@ static int sh_pfc_pinconf_set(struct pinctrl_dev *pctldev, unsigned _pin, break; + case PIN_CONFIG_DRIVE_STRENGTH: { + unsigned int arg = + pinconf_to_config_argument(configs[i]); + int ret; + + ret = sh_pfc_pinconf_set_drive_strength(pfc, _pin, arg); + if (ret < 0) + return ret; + + break; + } + case PIN_CONFIG_POWER_SOURCE: { unsigned int arg = pinconf_to_config_argument(configs[i]); @@ -678,7 +789,6 @@ int sh_pfc_register_pinctrl(struct sh_pfc *pfc) return -ENOMEM; pmx->pfc = pfc; - pfc->pinctrl = pmx; ret = sh_pfc_map_pins(pfc, pmx); if (ret < 0) @@ -692,19 +802,9 @@ int sh_pfc_register_pinctrl(struct sh_pfc *pfc) pmx->pctl_desc.pins = pmx->pins; pmx->pctl_desc.npins = pfc->info->nr_pins; - pmx->pctl = pinctrl_register(&pmx->pctl_desc, pfc->dev, pmx); + pmx->pctl = devm_pinctrl_register(pfc->dev, &pmx->pctl_desc, pmx); if (IS_ERR(pmx->pctl)) return PTR_ERR(pmx->pctl); return 0; } - -int sh_pfc_unregister_pinctrl(struct sh_pfc *pfc) -{ - struct sh_pfc_pinctrl *pmx = pfc->pinctrl; - - pinctrl_unregister(pmx->pctl); - - pfc->pinctrl = NULL; - return 0; -} |