[PATCH] pinctrl: uniphier: refactor drive strength get/set functions

From: Masahiro Yamada
Date: Wed Jan 10 2018 - 03:35:15 EST

There is code duplication between uniphier_conf_pin_drive_get() and
uniphier_conf_pin_drive_set(). Factor out the common code into
uniphier_conf_get_drvctrl_data().

Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
---

drivers/pinctrl/uniphier/pinctrl-uniphier-core.c | 176 ++++++++++++-----------
1 file changed, 91 insertions(+), 85 deletions(-)

diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c b/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
index 26fda5c..ec0f77a 100644
--- a/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
+++ b/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
@@ -146,6 +146,71 @@ static const struct pinctrl_ops uniphier_pctlops = {
.dt_free_map = pinctrl_utils_free_map,
};

+static const unsigned int uniphier_conf_drv_strengths_1bit[] = {4, 8};
+static const unsigned int uniphier_conf_drv_strengths_2bit[] = {8, 12, 16, 20};
+static const unsigned int uniphier_conf_drv_strengths_3bit[] = {4, 5, 7, 9, 11,
+ 12, 14, 16};
+static const unsigned int uniphier_conf_drv_strengths_fixed4[] = {4};
+static const unsigned int uniphier_conf_drv_strengths_fixed5[] = {5};
+static const unsigned int uniphier_conf_drv_strengths_fixed8[] = {8};
+
+static int uniphier_conf_get_drvctrl_data(struct pinctrl_dev *pctldev,
+ unsigned int pin, unsigned int *reg,
+ unsigned int *shift,
+ unsigned int *mask,
+ const unsigned int **strengths)
+{
+ const struct pin_desc *desc = pin_desc_get(pctldev, pin);
+ enum uniphier_pin_drv_type type =
+ uniphier_pin_get_drv_type(desc->drv_data);
+ unsigned int base = 0;
+ unsigned int stride = 0;
+ unsigned int width = 0;
+ unsigned int drvctrl;
+
+ switch (type) {
+ case UNIPHIER_PIN_DRV_1BIT:
+ *strengths = uniphier_conf_drv_strengths_1bit;
+ base = UNIPHIER_PINCTRL_DRVCTRL_BASE;
+ stride = 1;
+ width = 1;
+ break;
+ case UNIPHIER_PIN_DRV_2BIT:
+ *strengths = uniphier_conf_drv_strengths_2bit;
+ base = UNIPHIER_PINCTRL_DRV2CTRL_BASE;
+ stride = 2;
+ width = 2;
+ break;
+ case UNIPHIER_PIN_DRV_3BIT:
+ *strengths = uniphier_conf_drv_strengths_3bit;
+ base = UNIPHIER_PINCTRL_DRV3CTRL_BASE;
+ stride = 4;
+ width = 3;
+ break;
+ case UNIPHIER_PIN_DRV_FIXED4:
+ *strengths = uniphier_conf_drv_strengths_fixed4;
+ break;
+ case UNIPHIER_PIN_DRV_FIXED5:
+ *strengths = uniphier_conf_drv_strengths_fixed5;
+ break;
+ case UNIPHIER_PIN_DRV_FIXED8:
+ *strengths = uniphier_conf_drv_strengths_fixed8;
+ break;
+ default:
+ /* drive strength control is not supported for this pin */
+ return -EINVAL;
+ }
+
+ drvctrl = uniphier_pin_get_drvctrl(desc->drv_data);
+ drvctrl *= stride;
+
+ *reg = base + drvctrl / 32 * 4;
+ *shift = drvctrl % 32;
+ *mask = (1U << width) - 1;
+
+ return 0;
+}
+
static int uniphier_conf_pin_bias_get(struct pinctrl_dev *pctldev,
unsigned int pin,
enum pin_config_param param)
@@ -201,59 +266,24 @@ static int uniphier_conf_pin_drive_get(struct pinctrl_dev *pctldev,
unsigned int pin, u32 *strength)
{
struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
- const struct pin_desc *desc = pin_desc_get(pctldev, pin);
- enum uniphier_pin_drv_type type =
- uniphier_pin_get_drv_type(desc->drv_data);
- static const unsigned int strength_1bit[] = {4, 8};
- static const unsigned int strength_2bit[] = {8, 12, 16, 20};
- static const unsigned int strength_3bit[] = {4, 5, 7, 9, 11, 12,
- 14, 16};
- const unsigned int *supported_strength;
- unsigned int drvctrl, reg, shift, mask, width, val;
+ unsigned int reg, shift, mask, val;
+ const unsigned int *strengths;
int ret;

- switch (type) {
- case UNIPHIER_PIN_DRV_1BIT:
- supported_strength = strength_1bit;
- reg = UNIPHIER_PINCTRL_DRVCTRL_BASE;
- width = 1;
- break;
- case UNIPHIER_PIN_DRV_2BIT:
- supported_strength = strength_2bit;
- reg = UNIPHIER_PINCTRL_DRV2CTRL_BASE;
- width = 2;
- break;
- case UNIPHIER_PIN_DRV_3BIT:
- supported_strength = strength_3bit;
- reg = UNIPHIER_PINCTRL_DRV3CTRL_BASE;
- width = 4;
- break;
- case UNIPHIER_PIN_DRV_FIXED4:
- *strength = 4;
- return 0;
- case UNIPHIER_PIN_DRV_FIXED5:
- *strength = 5;
- return 0;
- case UNIPHIER_PIN_DRV_FIXED8:
- *strength = 8;
- return 0;
- default:
- /* drive strength control is not supported for this pin */
- return -EINVAL;
- }
-
- drvctrl = uniphier_pin_get_drvctrl(desc->drv_data);
- drvctrl *= width;
-
- reg += drvctrl / 32 * 4;
- shift = drvctrl % 32;
- mask = (1U << width) - 1;
-
- ret = regmap_read(priv->regmap, reg, &val);
+ ret = uniphier_conf_get_drvctrl_data(pctldev, pin, &reg, &shift,
+ &mask, &strengths);
if (ret)
return ret;

- *strength = supported_strength[(val >> shift) & mask];
+ if (mask) {
+ ret = regmap_read(priv->regmap, reg, &val);
+ if (ret)
+ return ret;
+ } else {
+ val = 0;
+ }
+
+ *strength = strengths[(val >> shift) & mask];

return 0;
}
@@ -398,40 +428,20 @@ static int uniphier_conf_pin_drive_set(struct pinctrl_dev *pctldev,
{
struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
const struct pin_desc *desc = pin_desc_get(pctldev, pin);
- enum uniphier_pin_drv_type type =
- uniphier_pin_get_drv_type(desc->drv_data);
- static const unsigned int strength_1bit[] = {4, 8, -1};
- static const unsigned int strength_2bit[] = {8, 12, 16, 20, -1};
- static const unsigned int strength_3bit[] = {4, 5, 7, 9, 11, 12, 14,
- 16, -1};
- const unsigned int *supported_strength;
- unsigned int drvctrl, reg, shift, mask, width, val;
+ unsigned int reg, shift, mask, val;
+ const unsigned int *strengths;
+ int ret;

- switch (type) {
- case UNIPHIER_PIN_DRV_1BIT:
- supported_strength = strength_1bit;
- reg = UNIPHIER_PINCTRL_DRVCTRL_BASE;
- width = 1;
- break;
- case UNIPHIER_PIN_DRV_2BIT:
- supported_strength = strength_2bit;
- reg = UNIPHIER_PINCTRL_DRV2CTRL_BASE;
- width = 2;
- break;
- case UNIPHIER_PIN_DRV_3BIT:
- supported_strength = strength_3bit;
- reg = UNIPHIER_PINCTRL_DRV3CTRL_BASE;
- width = 4;
- break;
- default:
- dev_err(pctldev->dev,
- "cannot change drive strength for pin %s\n",
+ ret = uniphier_conf_get_drvctrl_data(pctldev, pin, &reg, &shift,
+ &mask, &strengths);
+ if (ret) {
+ dev_err(pctldev->dev, "cannot set drive strength for pin %s\n",
desc->name);
- return -EINVAL;
+ return ret;
}

- for (val = 0; supported_strength[val] > 0; val++) {
- if (supported_strength[val] > strength)
+ for (val = 0; val <= mask; val++) {
+ if (strengths[val] > strength)
break;
}

@@ -442,14 +452,10 @@ static int uniphier_conf_pin_drive_set(struct pinctrl_dev *pctldev,
return -EINVAL;
}

- val--;
-
- drvctrl = uniphier_pin_get_drvctrl(desc->drv_data);
- drvctrl *= width;
+ if (!mask)
+ return 0;

- reg += drvctrl / 32 * 4;
- shift = drvctrl % 32;
- mask = (1U << width) - 1;
+ val--;

return regmap_update_bits(priv->regmap, reg,
mask << shift, val << shift);
--
2.7.4