pinctrl: meson: rework pinmux ops

This change prepare the introduction of new meson SoC. This new SoC will
share the same gpio/pinconf registers but the pinmux part will be
different. While the format of the data associated with each pinmux group
will change, the way to handle pinmuxing will be similar.

To deal with this new situation, the meson_pmx_struture is kept but the
data associated to it is now generic. This allows to reuse the basic
functions which would otherwise be copy/pasted in each pinmux driver
(such as getting the name a count of groups and functions) Only the
functions actually using this specific data is taken out of the common
code and is handling the SoC pinmuxing

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 7 insertions, 89 deletions

diff --git a/drivers/pinctrl/meson/pinctrl-meson.c b/drivers/pinctrl/meson/pinctrl-meson.c
index 525e8b17d471..29a458da78db 100644
--- a/drivers/pinctrl/meson/pinctrl-meson.c
+++ b/drivers/pinctrl/meson/pinctrl-meson.c
@@ -31,10 +31,6 @@
  * In some cases the register ranges for pull enable and pull
  * direction are the same and thus there are only 3 register ranges.
  *
- * Every pinmux group can be enabled by a specific bit in the first
- * register range; when all groups for a given pin are disabled the
- * pin acts as a GPIO.
- *
  * For the pull and GPIO configuration every bank uses a contiguous
  * set of bits in the register sets described above; the same register
  * can be shared by more banks with different offsets.
@@ -148,94 +144,24 @@ static const struct pinctrl_ops meson_pctrl_ops = {
 	.pin_dbg_show		= meson_pin_dbg_show,
 };
 
-/**
- * meson_pmx_disable_other_groups() - disable other groups using a given pin
- *
- * @pc:		meson pin controller device
- * @pin:	number of the pin
- * @sel_group:	index of the selected group, or -1 if none
- *
- * The function disables all pinmux groups using a pin except the
- * selected one. If @sel_group is -1 all groups are disabled, leaving
- * the pin in GPIO mode.
- */
-static void meson_pmx_disable_other_groups(struct meson_pinctrl *pc,
-					   unsigned int pin, int sel_group)
-{
-	struct meson_pmx_group *group;
-	int i, j;
-
-	for (i = 0; i < pc->data->num_groups; i++) {
-		group = &pc->data->groups[i];
-		if (group->is_gpio || i == sel_group)
-			continue;
-
-		for (j = 0; j < group->num_pins; j++) {
-			if (group->pins[j] == pin) {
-				/* We have found a group using the pin */
-				regmap_update_bits(pc->reg_mux,
-						   group->reg * 4,
-						   BIT(group->bit), 0);
-			}
-		}
-	}
-}
-
-static int meson_pmx_set_mux(struct pinctrl_dev *pcdev, unsigned func_num,
-			     unsigned group_num)
-{
-	struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
-	struct meson_pmx_func *func = &pc->data->funcs[func_num];
-	struct meson_pmx_group *group = &pc->data->groups[group_num];
-	int i, ret = 0;
-
-	dev_dbg(pc->dev, "enable function %s, group %s\n", func->name,
-		group->name);
-
-	/*
-	 * Disable groups using the same pin.
-	 * The selected group is not disabled to avoid glitches.
-	 */
-	for (i = 0; i < group->num_pins; i++)
-		meson_pmx_disable_other_groups(pc, group->pins[i], group_num);
-
-	/* Function 0 (GPIO) doesn't need any additional setting */
-	if (func_num)
-		ret = regmap_update_bits(pc->reg_mux, group->reg * 4,
-					 BIT(group->bit), BIT(group->bit));
-
-	return ret;
-}
-
-static int meson_pmx_request_gpio(struct pinctrl_dev *pcdev,
-				  struct pinctrl_gpio_range *range,
-				  unsigned offset)
-{
-	struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
-
-	meson_pmx_disable_other_groups(pc, offset, -1);
-
-	return 0;
-}
-
-static int meson_pmx_get_funcs_count(struct pinctrl_dev *pcdev)
+int meson_pmx_get_funcs_count(struct pinctrl_dev *pcdev)
 {
 	struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
 
 	return pc->data->num_funcs;
 }
 
-static const char *meson_pmx_get_func_name(struct pinctrl_dev *pcdev,
-					   unsigned selector)
+const char *meson_pmx_get_func_name(struct pinctrl_dev *pcdev,
+				    unsigned selector)
 {
 	struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
 
 	return pc->data->funcs[selector].name;
 }
 
-static int meson_pmx_get_groups(struct pinctrl_dev *pcdev, unsigned selector,
-				const char * const **groups,
-				unsigned * const num_groups)
+int meson_pmx_get_groups(struct pinctrl_dev *pcdev, unsigned selector,
+			 const char * const **groups,
+			 unsigned * const num_groups)
 {
 	struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
 
@@ -245,14 +171,6 @@ static int meson_pmx_get_groups(struct pinctrl_dev *pcdev, unsigned selector,
 	return 0;
 }
 
-static const struct pinmux_ops meson_pmx_ops = {
-	.set_mux = meson_pmx_set_mux,
-	.get_functions_count = meson_pmx_get_funcs_count,
-	.get_function_name = meson_pmx_get_func_name,
-	.get_function_groups = meson_pmx_get_groups,
-	.gpio_request_enable = meson_pmx_request_gpio,
-};
-
 static int meson_pinconf_set(struct pinctrl_dev *pcdev, unsigned int pin,
 			     unsigned long *configs, unsigned num_configs)
 {
@@ -609,7 +527,7 @@ int meson_pinctrl_probe(struct platform_device *pdev)
 	pc->desc.name		= "pinctrl-meson";
 	pc->desc.owner		= THIS_MODULE;
 	pc->desc.pctlops	= &meson_pctrl_ops;
-	pc->desc.pmxops		= &meson_pmx_ops;
+	pc->desc.pmxops		= pc->data->pmx_ops;
 	pc->desc.confops	= &meson_pinconf_ops;
 	pc->desc.pins		= pc->data->pins;
 	pc->desc.npins		= pc->data->num_pins;