[PATCH v4 08/12] pinctrl: single: add register access functions

[Dario Binacchi]

The configuration of pinmux registers was implemented with duplicate
code which can be removed by adding two functions for read/write access.
Access to 8-bit registers has also been added.

Signed-off-by: Dario Binacchi <dariobin at libero.it>
Reviewed-by: Simon Glass <sjg at chromium.org>

---

(no changes since v3)

Changes in v3:
- Added Simon Glass review tag.

Changes in v2:
- Updated commit message.
- Remove pointer to access functions.

 drivers/pinctrl/pinctrl-single.c | 71 +++++++++++++++++++++-----------
 1 file changed, 46 insertions(+), 25 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index 630a6c08b8..5b3ccc2281 100644
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -56,6 +56,38 @@ struct single_fdt_bits_cfg {
 	fdt32_t mask;
 };
 
+static unsigned int single_read(struct udevice *dev, fdt_addr_t reg)
+{
+	struct single_pdata *pdata = dev_get_plat(dev);
+
+	switch (pdata->width) {
+	case 8:
+		return readb(reg);
+	case 16:
+		return readw(reg);
+	default: /* 32 bits */
+		return readl(reg);
+	}
+
+	return readb(reg);
+}
+
+static void single_write(struct udevice *dev, unsigned int val, fdt_addr_t reg)
+{
+	struct single_pdata *pdata = dev_get_plat(dev);
+
+	switch (pdata->width) {
+	case 8:
+		writeb(val, reg);
+		break;
+	case 16:
+		writew(val, reg);
+		break;
+	default: /* 32 bits */
+		writel(val, reg);
+	}
+}
+
 /**
  * single_configure_pins() - Configure pins based on FDT data
  *
@@ -93,19 +125,10 @@ static int single_configure_pins(struct udevice *dev,
 
 		reg = pdata->base + offset;
 		val = fdt32_to_cpu(pins->val) & pdata->mask;
-		switch (pdata->width) {
-		case 16:
-			writew((readw(reg) & ~pdata->mask) | val, reg);
-			break;
-		case 32:
-			writel((readl(reg) & ~pdata->mask) | val, reg);
-			break;
-		default:
-			dev_warn(dev, "unsupported register width %i\n",
-				 pdata->width);
-			continue;
-		}
+		single_write(dev, (single_read(dev, reg) & ~pdata->mask) | val,
+			     reg);
 		dev_dbg(dev, "  reg/val %pa/0x%08x\n", &reg, val);
+
 	}
 	return 0;
 }
@@ -131,19 +154,7 @@ static int single_configure_bits(struct udevice *dev,
 
 		mask = fdt32_to_cpu(pins->mask);
 		val = fdt32_to_cpu(pins->val) & mask;
-
-		switch (pdata->width) {
-		case 16:
-			writew((readw(reg) & ~mask) | val, reg);
-			break;
-		case 32:
-			writel((readl(reg) & ~mask) | val, reg);
-			break;
-		default:
-			dev_warn(dev, "unsupported register width %i\n",
-				 pdata->width);
-			continue;
-		}
+		single_write(dev, (single_read(dev, reg) & ~mask) | val, reg);
 		dev_dbg(dev, "  reg/val %pa/0x%08x\n", &reg, val);
 	}
 	return 0;
@@ -196,6 +207,16 @@ static int single_of_to_plat(struct udevice *dev)
 		return ret;
 	}
 
+	switch (pdata->width) {
+	case 8:
+	case 16:
+	case 32:
+		break;
+	default:
+		dev_err(dev, "wrong register width\n");
+		return -EINVAL;
+	}
+
 	addr = dev_read_addr_size(dev, "reg", &size);
 	if (addr == FDT_ADDR_T_NONE) {
 		dev_err(dev, "failed to get base register size\n");
-- 
2.17.1