[PATCH 3/4] ARM: imx: pinctrl-imx: imx7d: add support for iomuxc lpsr

[Adrian Alonso <aalonso@freescale.com>]

* Extend pinctrl-imx driver to support iomux lpsr conntroller,
* iMX7D has two iomuxc controllers, iomuxc controller similar as
  previous iMX SoC generation and iomuxc-lpsr which provides
  low power state rentetion capabilities on gpios that are part of
  iomuxc-lpsr (GPIO1_IO7..GPIO1_IO0).
* Use IOMUXC_LPSR_SUPPORT and iput_val most significant bits to
  properly configure iomuxc/iomuxc-lpsr settings.

Signed-off-by: Adrian Alonso <aalonso@freescale.com>
---
 drivers/pinctrl/freescale/pinctrl-imx.c | 75 +++++++++++++++++++++++----------
 drivers/pinctrl/freescale/pinctrl-imx.h |  6 ++-
 2 files changed, 57 insertions(+), 24 deletions(-)

diff --git a/drivers/pinctrl/freescale/pinctrl-imx.c b/drivers/pinctrl/freescale/pinctrl-imx.c
index d7b98ba..2d434ac 100644
--- a/drivers/pinctrl/freescale/pinctrl-imx.c
+++ b/drivers/pinctrl/freescale/pinctrl-imx.c
@@ -1,7 +1,7 @@
 /*
  * Core driver for the imx pin controller
  *
- * Copyright (C) 2012 Freescale Semiconductor, Inc.
+ * Copyright (C) 2012-2015 Freescale Semiconductor, Inc.
  * Copyright (C) 2012 Linaro Ltd.
  *
  * Author: Dong Aisheng <dong.aisheng@linaro.org>
@@ -18,6 +18,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/of_address.h>
 #include <linux/pinctrl/machine.h>
 #include <linux/pinctrl/pinconf.h>
 #include <linux/pinctrl/pinctrl.h>
@@ -38,7 +39,6 @@
 struct imx_pinctrl {
 	struct device *dev;
 	struct pinctrl_dev *pctl;
-	void __iomem *base;
 	const struct imx_pinctrl_soc_info *info;
 };
 
@@ -212,12 +212,12 @@ static int imx_pmx_set(struct pinctrl_dev *pctldev, unsigned selector,
 
 		if (info->flags & SHARE_MUX_CONF_REG) {
 			u32 reg;
-			reg = readl(ipctl->base + pin_reg->mux_reg);
+			reg = readl(pin_reg->base + pin_reg->mux_reg);
 			reg &= ~(0x7 << 20);
 			reg |= (pin->mux_mode << 20);
-			writel(reg, ipctl->base + pin_reg->mux_reg);
+			writel(reg, pin_reg->base + pin_reg->mux_reg);
 		} else {
-			writel(pin->mux_mode, ipctl->base + pin_reg->mux_reg);
+			writel(pin->mux_mode, pin_reg->base + pin_reg->mux_reg);
 		}
 		dev_dbg(ipctl->dev, "write: offset 0x%x val 0x%x\n",
 			pin_reg->mux_reg, pin->mux_mode);
@@ -245,16 +245,22 @@ static int imx_pmx_set(struct pinctrl_dev *pctldev, unsigned selector,
 			 * The input_reg[i] here is actually some IOMUXC general
 			 * purpose register, not regular select input register.
 			 */
-			val = readl(ipctl->base + pin->input_reg);
+			val = readl(pin_reg->base + pin->input_reg);
 			val &= ~mask;
 			val |= select << shift;
-			writel(val, ipctl->base + pin->input_reg);
+			writel(val, pin_reg->base + pin->input_reg);
 		} else if (pin->input_reg) {
 			/*
 			 * Regular select input register can never be at offset
 			 * 0, and we only print register value for regular case.
 			 */
-			writel(pin->input_val, ipctl->base + pin->input_reg);
+			if (info->flags & IOMUXC_LPSR_SUPPORT &&
+				pin->input_val >> 24) {
+					writel(pin->input_val, info->base + pin->input_reg);
+			} else {
+				writel(pin->input_val, pin_reg->base + pin->input_reg);
+			}
+
 			dev_dbg(ipctl->dev,
 				"==>select_input: offset 0x%x val 0x%x\n",
 				pin->input_reg, pin->input_val);
@@ -326,10 +332,10 @@ static int imx_pmx_gpio_request_enable(struct pinctrl_dev *pctldev,
 	return -EINVAL;
 
 mux_pin:
-	reg = readl(ipctl->base + pin_reg->mux_reg);
+	reg = readl(pin_reg->base + pin_reg->mux_reg);
 	reg &= ~(0x7 << 20);
 	reg |= imx_pin->config;
-	writel(reg, ipctl->base + pin_reg->mux_reg);
+	writel(reg, pin_reg->base + pin_reg->mux_reg);
 
 	return 0;
 }
@@ -354,12 +360,12 @@ static int imx_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
 		return -EINVAL;
 
 	/* IBE always enabled allows us to read the value "on the wire" */
-	reg = readl(ipctl->base + pin_reg->mux_reg);
+	reg = readl(pin_reg->base + pin_reg->mux_reg);
 	if (input)
 		reg &= ~0x2;
 	else
 		reg |= 0x2;
-	writel(reg, ipctl->base + pin_reg->mux_reg);
+	writel(reg, pin_reg->base + pin_reg->mux_reg);
 
 	return 0;
 }
@@ -386,7 +392,7 @@ static int imx_pinconf_get(struct pinctrl_dev *pctldev,
 		return -EINVAL;
 	}
 
-	*config = readl(ipctl->base + pin_reg->conf_reg);
+	*config = readl(pin_reg->base + pin_reg->conf_reg);
 
 	if (info->flags & SHARE_MUX_CONF_REG)
 		*config &= 0xffff;
@@ -415,12 +421,12 @@ static int imx_pinconf_set(struct pinctrl_dev *pctldev,
 	for (i = 0; i < num_configs; i++) {
 		if (info->flags & SHARE_MUX_CONF_REG) {
 			u32 reg;
-			reg = readl(ipctl->base + pin_reg->conf_reg);
+			reg = readl(pin_reg->base + pin_reg->conf_reg);
 			reg &= ~0xffff;
 			reg |= configs[i];
-			writel(reg, ipctl->base + pin_reg->conf_reg);
+			writel(reg, pin_reg->base + pin_reg->conf_reg);
 		} else {
-			writel(configs[i], ipctl->base + pin_reg->conf_reg);
+			writel(configs[i], pin_reg->base + pin_reg->conf_reg);
 		}
 		dev_dbg(ipctl->dev, "write: offset 0x%x val 0x%lx\n",
 			pin_reg->conf_reg, configs[i]);
@@ -442,7 +448,7 @@ static void imx_pinconf_dbg_show(struct pinctrl_dev *pctldev,
 		return;
 	}
 
-	config = readl(ipctl->base + pin_reg->conf_reg);
+	config = readl(pin_reg->base + pin_reg->conf_reg);
 	seq_printf(s, "0x%lx", config);
 }
 
@@ -551,14 +557,27 @@ static int imx_pinctrl_parse_groups(struct device_node *np,
 		}
 
 		pin_id = mux_reg ? mux_reg / 4 : conf_reg / 4;
+
+		pin->input_reg = be32_to_cpu(*list++);
+		pin->mux_mode = be32_to_cpu(*list++);
+		pin->input_val = be32_to_cpu(*list++);
+
+		if (info->flags & IOMUXC_LPSR_SUPPORT) {
+			if (pin->input_val >> 24)
+				pin_id = pin->input_val >> 24 & 0xff;
+		}
+
 		pin_reg = &info->pin_regs[pin_id];
 		pin->pin = pin_id;
 		grp->pin_ids[i] = pin_id;
 		pin_reg->mux_reg = mux_reg;
 		pin_reg->conf_reg = conf_reg;
-		pin->input_reg = be32_to_cpu(*list++);
-		pin->mux_mode = be32_to_cpu(*list++);
-		pin->input_val = be32_to_cpu(*list++);
+		pin_reg->base = info->base;
+
+		if (info->flags & IOMUXC_LPSR_SUPPORT) {
+			if (pin->input_val >> 24)
+				pin_reg->base = info->base_lpsr;
+		}
 
 		/* SION bit is in mux register */
 		config = be32_to_cpu(*list++);
@@ -683,6 +702,7 @@ static int imx_pinctrl_probe_dt(struct platform_device *pdev,
 int imx_pinctrl_probe(struct platform_device *pdev,
 		      struct imx_pinctrl_soc_info *info)
 {
+	struct device_node *dev_np = pdev->dev.of_node;
 	struct imx_pinctrl *ipctl;
 	struct resource *res;
 	int ret, i;
@@ -709,9 +729,18 @@ int imx_pinctrl_probe(struct platform_device *pdev,
 	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	ipctl->base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(ipctl->base))
-		return PTR_ERR(ipctl->base);
+	info->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(info->base))
+		return PTR_ERR(info->base);
+
+	if (info->flags & IOMUXC_LPSR_SUPPORT) {
+		info->base_lpsr = of_iomap(dev_np, 1);
+		if (IS_ERR(info->base_lpsr)) {
+			dev_err(&pdev->dev,
+				"iomuxc-lpsr base address not found\n");
+			return PTR_ERR(info->base_lpsr);
+		}
+	}
 
 	imx_pinctrl_desc.name = dev_name(&pdev->dev);
 	imx_pinctrl_desc.pins = info->pins;
diff --git a/drivers/pinctrl/freescale/pinctrl-imx.h b/drivers/pinctrl/freescale/pinctrl-imx.h
index 49e55d3..b3e00db 100644
--- a/drivers/pinctrl/freescale/pinctrl-imx.h
+++ b/drivers/pinctrl/freescale/pinctrl-imx.h
@@ -1,7 +1,7 @@
 /*
  * IMX pinmux core definitions
  *
- * Copyright (C) 2012 Freescale Semiconductor, Inc.
+ * Copyright (C) 2012-2015 Freescale Semiconductor, Inc.
  * Copyright (C) 2012 Linaro Ltd.
  *
  * Author: Dong Aisheng <dong.aisheng@linaro.org>
@@ -69,6 +69,7 @@ struct imx_pmx_func {
 struct imx_pin_reg {
 	s16 mux_reg;
 	s16 conf_reg;
+	void __iomem *base;
 };
 
 struct imx_pinctrl_soc_info {
@@ -81,9 +82,12 @@ struct imx_pinctrl_soc_info {
 	struct imx_pmx_func *functions;
 	unsigned int nfunctions;
 	unsigned int flags;
+	void __iomem *base;
+	void __iomem *base_lpsr;
 };
 
 #define SHARE_MUX_CONF_REG	0x1
+#define IOMUXC_LPSR_SUPPORT 	0x2
 
 #define NO_MUX		0x0
 #define NO_PAD		0x0
-- 
2.1.4

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