diff options
Diffstat (limited to 'drivers/pinctrl/meson')
| -rw-r--r-- | drivers/pinctrl/meson/pinctrl-meson.c | 99 | ||||
| -rw-r--r-- | drivers/pinctrl/meson/pinctrl-meson.h | 18 |
2 files changed, 116 insertions, 1 deletions
diff --git a/drivers/pinctrl/meson/pinctrl-meson.c b/drivers/pinctrl/meson/pinctrl-meson.c index 8ea5c1527064..33b4b141baac 100644 --- a/drivers/pinctrl/meson/pinctrl-meson.c +++ b/drivers/pinctrl/meson/pinctrl-meson.c @@ -220,11 +220,54 @@ static int meson_pinconf_enable_bias(struct meson_pinctrl *pc, unsigned int pin, return 0; } +static int meson_pinconf_set_drive_strength(struct meson_pinctrl *pc, + unsigned int pin, + u16 drive_strength_ua) +{ + struct meson_bank *bank; + unsigned int reg, bit, ds_val; + int ret; + + if (!pc->reg_ds) { + dev_err(pc->dev, "drive-strength not supported\n"); + return -ENOTSUPP; + } + + ret = meson_get_bank(pc, pin, &bank); + if (ret) + return ret; + + meson_calc_reg_and_bit(bank, pin, REG_DS, ®, &bit); + bit = bit << 1; + + if (drive_strength_ua <= 500) { + ds_val = MESON_PINCONF_DRV_500UA; + } else if (drive_strength_ua <= 2500) { + ds_val = MESON_PINCONF_DRV_2500UA; + } else if (drive_strength_ua <= 3000) { + ds_val = MESON_PINCONF_DRV_3000UA; + } else if (drive_strength_ua <= 4000) { + ds_val = MESON_PINCONF_DRV_4000UA; + } else { + dev_warn_once(pc->dev, + "pin %u: invalid drive-strength : %d , default to 4mA\n", + pin, drive_strength_ua); + ds_val = MESON_PINCONF_DRV_4000UA; + } + + ret = regmap_update_bits(pc->reg_ds, reg, 0x3 << bit, ds_val << bit); + if (ret) + return ret; + + return 0; +} + static int meson_pinconf_set(struct pinctrl_dev *pcdev, unsigned int pin, unsigned long *configs, unsigned num_configs) { struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev); enum pin_config_param param; + unsigned int drive_strength_ua; int i, ret; for (i = 0; i < num_configs; i++) { @@ -246,6 +289,14 @@ static int meson_pinconf_set(struct pinctrl_dev *pcdev, unsigned int pin, if (ret) return ret; break; + case PIN_CONFIG_DRIVE_STRENGTH_UA: + drive_strength_ua = + pinconf_to_config_argument(configs[i]); + ret = meson_pinconf_set_drive_strength + (pc, pin, drive_strength_ua); + if (ret) + return ret; + break; default: return -ENOTSUPP; } @@ -288,12 +339,55 @@ static int meson_pinconf_get_pull(struct meson_pinctrl *pc, unsigned int pin) return conf; } +static int meson_pinconf_get_drive_strength(struct meson_pinctrl *pc, + unsigned int pin, + u16 *drive_strength_ua) +{ + struct meson_bank *bank; + unsigned int reg, bit; + unsigned int val; + int ret; + + if (!pc->reg_ds) + return -ENOTSUPP; + + ret = meson_get_bank(pc, pin, &bank); + if (ret) + return ret; + + meson_calc_reg_and_bit(bank, pin, REG_DS, ®, &bit); + + ret = regmap_read(pc->reg_ds, reg, &val); + if (ret) + return ret; + + switch ((val >> bit) & 0x3) { + case MESON_PINCONF_DRV_500UA: + *drive_strength_ua = 500; + break; + case MESON_PINCONF_DRV_2500UA: + *drive_strength_ua = 2500; + break; + case MESON_PINCONF_DRV_3000UA: + *drive_strength_ua = 3000; + break; + case MESON_PINCONF_DRV_4000UA: + *drive_strength_ua = 4000; + break; + default: + return -EINVAL; + } + + return 0; +} + static int meson_pinconf_get(struct pinctrl_dev *pcdev, unsigned int pin, unsigned long *config) { struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev); enum pin_config_param param = pinconf_to_config_param(*config); u16 arg; + int ret; switch (param) { case PIN_CONFIG_BIAS_DISABLE: @@ -304,6 +398,11 @@ static int meson_pinconf_get(struct pinctrl_dev *pcdev, unsigned int pin, else return -EINVAL; break; + case PIN_CONFIG_DRIVE_STRENGTH_UA: + ret = meson_pinconf_get_drive_strength(pc, pin, &arg); + if (ret) + return ret; + break; default: return -ENOTSUPP; } diff --git a/drivers/pinctrl/meson/pinctrl-meson.h b/drivers/pinctrl/meson/pinctrl-meson.h index 5eaab925f427..cd955fb7c2ce 100644 --- a/drivers/pinctrl/meson/pinctrl-meson.h +++ b/drivers/pinctrl/meson/pinctrl-meson.h @@ -71,10 +71,21 @@ enum meson_reg_type { REG_DIR, REG_OUT, REG_IN, + REG_DS, NUM_REG, }; /** + * enum meson_pinconf_drv - value of drive-strength supported + */ +enum meson_pinconf_drv { + MESON_PINCONF_DRV_500UA, + MESON_PINCONF_DRV_2500UA, + MESON_PINCONF_DRV_3000UA, + MESON_PINCONF_DRV_4000UA, +}; + +/** * struct meson bank * * @name: bank name @@ -132,7 +143,8 @@ struct meson_pinctrl { .num_groups = ARRAY_SIZE(fn ## _groups), \ } -#define BANK(n, f, l, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib) \ +#define BANK_DS(n, f, l, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib, \ + dsr, dsb) \ { \ .name = n, \ .first = f, \ @@ -145,9 +157,13 @@ struct meson_pinctrl { [REG_DIR] = { dr, db }, \ [REG_OUT] = { or, ob }, \ [REG_IN] = { ir, ib }, \ + [REG_DS] = { dsr, dsb }, \ }, \ } +#define BANK(n, f, l, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib) \ + BANK_DS(n, f, l, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib, 0, 0) + #define MESON_PIN(x) PINCTRL_PIN(x, #x) /* Common pmx functions */ |