linux-kernel - [PATCH v3 3/6] pinctrl: renesas: pinctrl-rzg2l: Add helper functions to read/write pin config

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Message-Id: <20211110224622.16022-4-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date:   Wed, 10 Nov 2021 22:46:19 +0000
From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-renesas-soc@...r.kernel.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH v3 3/6] pinctrl: renesas: pinctrl-rzg2l: Add helper functions to read/write pin config

Add helper functions to read/read modify write pin config.

Switch to use helper functions for pins supporting PIN_CONFIG_INPUT_ENABLE
capabilities.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
---
v2->v3
* Dropped duplicate masking in rzg2l_read_pin_config
* Dropped port_pin flag
* Dropped spinlocks around read/write
---
 drivers/pinctrl/renesas/pinctrl-rzg2l.c | 58 +++++++++++++++----------
 1 file changed, 34 insertions(+), 24 deletions(-)

diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
index be9af717a497..984c19328efa 100644
--- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
@@ -424,6 +424,36 @@ static int rzg2l_dt_node_to_map(struct pinctrl_dev *pctldev,
 	return ret;
 }
 
+static u32 rzg2l_read_pin_config(struct rzg2l_pinctrl *pctrl, u32 offset,
+				 u8 bit, u32 mask)
+{
+	void __iomem *addr = pctrl->base + offset;
+
+	/* handle _L/_H for 32-bit register read/write */
+	if (bit >= 4) {
+		bit -= 4;
+		addr += 4;
+	}
+
+	return (readl(addr) >> (bit * 8)) & mask;
+}
+
+static void rzg2l_rmw_pin_config(struct rzg2l_pinctrl *pctrl, u32 offset,
+				 u8 bit, u32 mask, u32 val)
+{
+	void __iomem *addr = pctrl->base + offset;
+	u32 reg;
+
+	/* handle _L/_H for 32-bit register read/write */
+	if (bit >= 4) {
+		bit -= 4;
+		addr += 4;
+	}
+
+	reg = readl(addr) & ~(mask << (bit * 8));
+	writel(reg | (val << (bit * 8)), addr);
+}
+
 static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
 				     unsigned int _pin,
 				     unsigned long *config)
@@ -432,8 +462,8 @@ static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
 	enum pin_config_param param = pinconf_to_config_param(*config);
 	const struct pinctrl_pin_desc *pin = &pctrl->desc.pins[_pin];
 	unsigned int *pin_data = pin->drv_data;
-	u32 port_offset = 0, reg;
 	unsigned int arg = 0;
+	u32 port_offset = 0;
 	unsigned long flags;
 	void __iomem *addr;
 	u32 cfg = 0;
@@ -452,17 +482,7 @@ static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
 	case PIN_CONFIG_INPUT_ENABLE:
 		if (!(cfg & PIN_CFG_IEN))
 			return -EINVAL;
-		spin_lock_irqsave(&pctrl->lock, flags);
-		/* handle _L/_H for 32-bit register read/write */
-		addr = pctrl->base + IEN(port_offset);
-		if (bit >= 4) {
-			bit -= 4;
-			addr += 4;
-		}
-
-		reg = readl(addr) & (IEN_MASK << (bit * 8));
-		arg = (reg >> (bit * 8)) & 0x1;
-		spin_unlock_irqrestore(&pctrl->lock, flags);
+		arg = rzg2l_read_pin_config(pctrl, IEN(port_offset), bit, IEN_MASK);
 		break;
 
 	case PIN_CONFIG_POWER_SOURCE: {
@@ -502,7 +522,7 @@ static int rzg2l_pinctrl_pinconf_set(struct pinctrl_dev *pctldev,
 	const struct pinctrl_pin_desc *pin = &pctrl->desc.pins[_pin];
 	unsigned int *pin_data = pin->drv_data;
 	enum pin_config_param param;
-	u32 port_offset = 0, reg;
+	u32 port_offset = 0;
 	unsigned long flags;
 	void __iomem *addr;
 	unsigned int i;
@@ -528,17 +548,7 @@ static int rzg2l_pinctrl_pinconf_set(struct pinctrl_dev *pctldev,
 			if (!(cfg & PIN_CFG_IEN))
 				return -EINVAL;
 
-			/* handle _L/_H for 32-bit register read/write */
-			addr = pctrl->base + IEN(port_offset);
-			if (bit >= 4) {
-				bit -= 4;
-				addr += 4;
-			}
-
-			spin_lock_irqsave(&pctrl->lock, flags);
-			reg = readl(addr) & ~(IEN_MASK << (bit * 8));
-			writel(reg | (arg << (bit * 8)), addr);
-			spin_unlock_irqrestore(&pctrl->lock, flags);
+			rzg2l_rmw_pin_config(pctrl, IEN(port_offset), bit, IEN_MASK, !!arg);
 			break;
 		}
 
-- 
2.17.1