sh-pfc: Remove configuration dry-run and free

The purpose of the dry-run is to ensure that a pin about to be
configured isn't in use. However, the current implementation is a no-op.
This proves that the dry-run isn't essential. Remove it.

Freeing configuration then becomes a no-op as well. Remove it.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/sh-pfc/core.c

@@ -163,22 +163,6 @@ static void sh_pfc_config_reg_helper(struct sh_pfc *pfc,
 	}
 }
 
-static int sh_pfc_read_config_reg(struct sh_pfc *pfc,
-				  struct pinmux_cfg_reg *crp,
-				  unsigned long field)
-{
-	void __iomem *mapped_reg;
-	unsigned long mask, pos;
-
-	sh_pfc_config_reg_helper(pfc, crp, field, &mapped_reg, &mask, &pos);
-
-	pr_debug("read_reg: addr = %lx, field = %ld, "
-		 "r_width = %ld, f_width = %ld\n",
-		 crp->reg, field, crp->reg_width, crp->field_width);
-
-	return (sh_pfc_read_raw_reg(mapped_reg, crp->reg_width) >> pos) & mask;
-}
-
 static void sh_pfc_write_config_reg(struct sh_pfc *pfc,
 				    struct pinmux_cfg_reg *crp,
 				    unsigned long field, unsigned long value)
@@ -209,7 +193,7 @@ static void sh_pfc_write_config_reg(struct sh_pfc *pfc,
 
 static int sh_pfc_get_config_reg(struct sh_pfc *pfc, pinmux_enum_t enum_id,
 				 struct pinmux_cfg_reg **crp, int *fieldp,
-				 int *valuep, unsigned long **cntp)
+				 int *valuep)
 {
 	struct pinmux_cfg_reg *config_reg;
 	unsigned long r_width, f_width, curr_width, ncomb;
@@ -239,7 +223,6 @@ static int sh_pfc_get_config_reg(struct sh_pfc *pfc, pinmux_enum_t enum_id,
 					*crp = config_reg;
 					*fieldp = m;
 					*valuep = n;
-					*cntp = &config_reg->cnt[m];
 					return 0;
 				}
 			}
@@ -274,14 +257,12 @@ static int sh_pfc_mark_to_enum(struct sh_pfc *pfc, pinmux_enum_t mark, int pos,
 	return -1;
 }
 
-int sh_pfc_config_mux(struct sh_pfc *pfc, unsigned mark, int pinmux_type,
-		      int cfg_mode)
+int sh_pfc_config_mux(struct sh_pfc *pfc, unsigned mark, int pinmux_type)
 {
 	struct pinmux_cfg_reg *cr = NULL;
 	pinmux_enum_t enum_id;
 	struct pinmux_range *range;
 	int in_range, pos, field, value;
-	unsigned long *cntp;
 
 	switch (pinmux_type) {
 
@@ -306,7 +287,7 @@ int sh_pfc_config_mux(struct sh_pfc *pfc, unsigned mark, int pinmux_type,
 		break;
 
 	default:
-		goto out_err;
+		return -1;
 	}
 
 	pos = 0;
@@ -316,7 +297,7 @@ int sh_pfc_config_mux(struct sh_pfc *pfc, unsigned mark, int pinmux_type,
 	while (1) {
 		pos = sh_pfc_mark_to_enum(pfc, mark, pos, &enum_id);
 		if (pos <= 0)
-			goto out_err;
+			return -1;
 
 		if (!enum_id)
 			break;
@@ -360,30 +341,13 @@ int sh_pfc_config_mux(struct sh_pfc *pfc, unsigned mark, int pinmux_type,
 			continue;
 
 		if (sh_pfc_get_config_reg(pfc, enum_id, &cr,
-					  &field, &value, &cntp) != 0)
-			goto out_err;
-
-		switch (cfg_mode) {
-		case GPIO_CFG_DRYRUN:
-			if (!*cntp ||
-			    (sh_pfc_read_config_reg(pfc, cr, field) != value))
-				continue;
-			break;
+					  &field, &value) != 0)
+			return -1;
 
-		case GPIO_CFG_REQ:
 		sh_pfc_write_config_reg(pfc, cr, field, value);
-			*cntp = *cntp + 1;
-			break;
-
-		case GPIO_CFG_FREE:
-			*cntp = *cntp - 1;
-			break;
-		}
 	}
 
 	return 0;
- out_err:
-	return -1;
 }
 
 static int sh_pfc_probe(struct platform_device *pdev)

drivers/pinctrl/sh-pfc/core.h

@@ -52,8 +52,7 @@ void sh_pfc_write_raw_reg(void __iomem *mapped_reg, unsigned long reg_width,
 			  unsigned long data);
 
 int sh_pfc_get_pin_index(struct sh_pfc *pfc, unsigned int pin);
-int sh_pfc_config_mux(struct sh_pfc *pfc, unsigned mark, int pinmux_type,
-		      int cfg_mode);
+int sh_pfc_config_mux(struct sh_pfc *pfc, unsigned mark, int pinmux_type);
 
 extern struct sh_pfc_soc_info r8a7740_pinmux_info;
 extern struct sh_pfc_soc_info r8a7779_pinmux_info;

drivers/pinctrl/sh-pfc/gpio.c

@@ -285,10 +285,7 @@ static int gpio_function_request(struct gpio_chip *gc, unsigned offset)
 
 	spin_lock_irqsave(&pfc->lock, flags);
 
-	if (sh_pfc_config_mux(pfc, mark, PINMUX_TYPE_FUNCTION, GPIO_CFG_DRYRUN))
-		goto done;
-
-	if (sh_pfc_config_mux(pfc, mark, PINMUX_TYPE_FUNCTION, GPIO_CFG_REQ))
+	if (sh_pfc_config_mux(pfc, mark, PINMUX_TYPE_FUNCTION))
 		goto done;
 
 	ret = 0;
@@ -300,15 +297,6 @@ static int gpio_function_request(struct gpio_chip *gc, unsigned offset)
 
 static void gpio_function_free(struct gpio_chip *gc, unsigned offset)
 {
-	struct sh_pfc *pfc = gpio_to_pfc(gc);
-	unsigned int mark = pfc->info->func_gpios[offset].enum_id;
-	unsigned long flags;
-
-	spin_lock_irqsave(&pfc->lock, flags);
-
-	sh_pfc_config_mux(pfc, mark, PINMUX_TYPE_FUNCTION, GPIO_CFG_FREE);
-
-	spin_unlock_irqrestore(&pfc->lock, flags);
 }
 
 static int gpio_function_setup(struct sh_pfc_chip *chip)

drivers/pinctrl/sh-pfc/pinctrl.c

@@ -119,12 +119,7 @@ static int sh_pfc_func_enable(struct pinctrl_dev *pctldev, unsigned selector,
 	spin_lock_irqsave(&pfc->lock, flags);
 
 	for (i = 0; i < grp->nr_pins; ++i) {
-		if (sh_pfc_config_mux(pfc, grp->mux[i], PINMUX_TYPE_FUNCTION,
-				      GPIO_CFG_DRYRUN))
-			goto done;
-
-		if (sh_pfc_config_mux(pfc, grp->mux[i], PINMUX_TYPE_FUNCTION,
-				      GPIO_CFG_REQ))
+		if (sh_pfc_config_mux(pfc, grp->mux[i], PINMUX_TYPE_FUNCTION))
 			goto done;
 	}
 
@@ -138,19 +133,6 @@ static int sh_pfc_func_enable(struct pinctrl_dev *pctldev, unsigned selector,
 static void sh_pfc_func_disable(struct pinctrl_dev *pctldev, unsigned selector,
 				unsigned group)
 {
-	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
-	struct sh_pfc *pfc = pmx->pfc;
-	const struct sh_pfc_pin_group *grp = &pfc->info->groups[group];
-	unsigned long flags;
-	unsigned int i;
-
-	spin_lock_irqsave(&pfc->lock, flags);
-
-	for (i = 0; i < grp->nr_pins; ++i)
-		sh_pfc_config_mux(pfc, grp->mux[i], PINMUX_TYPE_FUNCTION,
-				  GPIO_CFG_FREE);
-
-	spin_unlock_irqrestore(&pfc->lock, flags);
 }
 
 static int sh_pfc_reconfig_pin(struct sh_pfc_pinctrl *pmx, unsigned offset,
@@ -166,32 +148,18 @@ static int sh_pfc_reconfig_pin(struct sh_pfc_pinctrl *pmx, unsigned offset,
 
 	spin_lock_irqsave(&pfc->lock, flags);
 
-	/*
-	 * See if the present config needs to first be de-configured.
-	 */
 	switch (cfg->type) {
 	case PINMUX_TYPE_GPIO:
-		break;
 	case PINMUX_TYPE_OUTPUT:
 	case PINMUX_TYPE_INPUT:
 	case PINMUX_TYPE_INPUT_PULLUP:
 	case PINMUX_TYPE_INPUT_PULLDOWN:
-		sh_pfc_config_mux(pfc, mark, cfg->type, GPIO_CFG_FREE);
 		break;
 	default:
 		goto err;
 	}
 
-	/*
-	 * Dry run
-	 */
-	if (sh_pfc_config_mux(pfc, mark, new_type, GPIO_CFG_DRYRUN) != 0)
-		goto err;
-
-	/*
-	 * Request
-	 */
-	if (sh_pfc_config_mux(pfc, mark, new_type, GPIO_CFG_REQ) != 0)
+	if (sh_pfc_config_mux(pfc, mark, new_type) != 0)
 		goto err;
 
 	cfg->type = new_type;
@@ -241,18 +209,6 @@ static void sh_pfc_gpio_disable_free(struct pinctrl_dev *pctldev,
 				     struct pinctrl_gpio_range *range,
 				     unsigned offset)
 {
-	struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
-	struct sh_pfc *pfc = pmx->pfc;
-	int idx = sh_pfc_get_pin_index(pfc, offset);
-	struct sh_pfc_pin_config *cfg = &pmx->configs[idx];
-	struct sh_pfc_pin *pin = &pfc->info->pins[idx];
-	unsigned long flags;
-
-	spin_lock_irqsave(&pfc->lock, flags);
-
-	sh_pfc_config_mux(pfc, pin->enum_id, cfg->type, GPIO_CFG_FREE);
-
-	spin_unlock_irqrestore(&pfc->lock, flags);
 }
 
 static int sh_pfc_gpio_set_direction(struct pinctrl_dev *pctldev,

drivers/pinctrl/sh-pfc/sh_pfc.h

@@ -84,19 +84,16 @@ struct pinmux_func {
 
 struct pinmux_cfg_reg {
 	unsigned long reg, reg_width, field_width;
-	unsigned long *cnt;
 	pinmux_enum_t *enum_ids;
 	unsigned long *var_field_width;
 };
 
 #define PINMUX_CFG_REG(name, r, r_width, f_width) \
 	.reg = r, .reg_width = r_width, .field_width = f_width,		\
-	.cnt = (unsigned long [r_width / f_width]) {}, \
 	.enum_ids = (pinmux_enum_t [(r_width / f_width) * (1 << f_width)])
 
 #define PINMUX_CFG_REG_VAR(name, r, r_width, var_fw0, var_fwn...) \
 	.reg = r, .reg_width = r_width,	\
-	.cnt = (unsigned long [r_width]) {}, \
 	.var_field_width = (unsigned long [r_width]) { var_fw0, var_fwn, 0 }, \
 	.enum_ids = (pinmux_enum_t [])
 
@@ -155,7 +152,7 @@ struct sh_pfc_soc_info {
 	unsigned long unlock_reg;
 };
 
-enum { GPIO_CFG_DRYRUN, GPIO_CFG_REQ, GPIO_CFG_FREE };
+enum { GPIO_CFG_REQ, GPIO_CFG_FREE };
 
 /* helper macro for port */
 #define PORT_1(fn, pfx, sfx) fn(pfx, sfx)