linux-kernel - [RFC 3/3] New pinmux testing hacks

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Message-Id: <1323382390-14892-4-git-send-email-swarren@nvidia.com>
Date:	Thu,  8 Dec 2011 15:13:10 -0700
From:	Stephen Warren <swarren@...dia.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-tegra@...r.kernel.org, Stephen Warren <swarren@...dia.com>
Subject: [RFC 3/3] New pinmux testing hacks

Signed-off-by: Stephen Warren <swarren@...dia.com>
---
DO NOT MERGE this: This is a local hack I use for testing, never to be
accepted upstream. I include it only as an FYI to anyone interested in
testing this.

 arch/arm/boot/dts/tegra20.dtsi  |    8 +++++
 arch/arm/mach-tegra/pinmux.c    |    2 +
 drivers/pinctrl/pinctrl-tegra.c |   57 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 67 insertions(+), 0 deletions(-)

diff --git a/arch/arm/boot/dts/tegra20.dtsi b/arch/arm/boot/dts/tegra20.dtsi
index 4af5cd2..557d3d1 100644
--- a/arch/arm/boot/dts/tegra20.dtsi
+++ b/arch/arm/boot/dts/tegra20.dtsi
@@ -108,6 +108,14 @@
 			0x70000868 0xa8 >; /* Pad control registers */
 	};
 
+	pinmux2: pinmux2@...00000 {
+		compatible = "nvidia,tegra20-pinmux-new";
+		reg = < 0x70000014 0x10    /* Tri-state registers */
+			0x70000080 0x20    /* Mux registers */
+			0x700000a0 0x14    /* Pull-up/down registers */
+			0x70000868 0xa8 >; /* Pad control registers */
+	};
+
 	serial@...06000 {
 		compatible = "nvidia,tegra20-uart";
 		reg = <0x70006000 0x40>;
diff --git a/arch/arm/mach-tegra/pinmux.c b/arch/arm/mach-tegra/pinmux.c
index 1d20165..453dce5 100644
--- a/arch/arm/mach-tegra/pinmux.c
+++ b/arch/arm/mach-tegra/pinmux.c
@@ -722,6 +722,7 @@ static int __devinit tegra_pinmux_probe(struct platform_device *pdev)
 			return -ENODEV;
 		}
 
+#if 0
 		if (!devm_request_mem_region(&pdev->dev, res->start,
 					    resource_size(res),
 					    dev_name(&pdev->dev))) {
@@ -729,6 +730,7 @@ static int __devinit tegra_pinmux_probe(struct platform_device *pdev)
 				"Couldn't request MEM resource %d\n", i);
 			return -ENODEV;
 		}
+#endif
 
 		regs[i] = devm_ioremap(&pdev->dev, res->start,
 					resource_size(res));
diff --git a/drivers/pinctrl/pinctrl-tegra.c b/drivers/pinctrl/pinctrl-tegra.c
index 988be8f..fc2aa7e 100644
--- a/drivers/pinctrl/pinctrl-tegra.c
+++ b/drivers/pinctrl/pinctrl-tegra.c
@@ -428,6 +428,59 @@ static struct of_device_id tegra_pinctrl_of_match[] __devinitdata = {
 	{},
 };
 
+#include <linux/pinctrl/machine.h>
+static void pmx_test_pre(void)
+{
+	static struct pinmux_map map[] = {
+		{
+			.name = "hack",
+			.ctrl_dev_name = "pinctrl.0",
+			.function = "pllm_out1",
+			.group = "cdev1",
+			.hog_on_boot = true,
+		},
+	};
+
+	pinmux_register_mappings(map, ARRAY_SIZE(map));
+}
+
+static void pmx_test_post(struct pinctrl_dev *pctl)
+{
+	unsigned long config;
+	int ret;
+
+	config = TEGRA_PINCONF_PACK(TEGRA_PINCONF_PARAM_TRISTATE, 0);
+	ret = pin_config_group_get(pctl, "atc", &config);
+	if (ret)
+		printk("ATC TRISTATE: COULD NOT RETRIEVE: %d\n", ret);
+	else
+		printk("ATC TRISTATE IS %d\n", (int)TEGRA_PINCONF_UNPACK_ARG(config));
+
+	config = TEGRA_PINCONF_PACK(TEGRA_PINCONF_PARAM_TRISTATE, 1);
+	ret = pin_config_group_set(pctl, "atc", config);
+	if (ret)
+		printk("ATC TRISTATE: COULD NOT SET: %d\n", ret);
+
+	config = TEGRA_PINCONF_PACK(TEGRA_PINCONF_PARAM_TRISTATE, 0);
+	ret = pin_config_group_get(pctl, "atc", &config);
+	if (ret)
+		printk("ATC TRISTATE: COULD NOT RETRIEVE: %d\n", ret);
+	else
+		printk("ATC TRISTATE IS NOW %d\n", (int)TEGRA_PINCONF_UNPACK_ARG(config));
+
+	config = TEGRA_PINCONF_PACK(TEGRA_PINCONF_PARAM_TRISTATE, 0);
+	ret = pin_config_group_set(pctl, "atc", config);
+	if (ret)
+		printk("ATC TRISTATE: COULD NOT SET: %d\n", ret);
+
+	config = TEGRA_PINCONF_PACK(TEGRA_PINCONF_PARAM_TRISTATE, 0);
+	ret = pin_config_group_get(pctl, "atc", &config);
+	if (ret)
+		printk("ATC TRISTATE: COULD NOT RETRIEVE: %d\n", ret);
+	else
+		printk("ATC TRISTATE IS NOW %d\n", (int)TEGRA_PINCONF_UNPACK_ARG(config));
+}
+
 static int __devinit tegra_pinctrl_probe(struct platform_device *pdev)
 {
 	const struct of_device_id *match;
@@ -494,6 +547,8 @@ static int __devinit tegra_pinctrl_probe(struct platform_device *pdev)
 		}
 	}
 
+	pmx_test_pre();
+
 	pmx->pctl = pinctrl_register(&tegra_pinctrl_desc, &pdev->dev, pmx);
 	if (IS_ERR(pmx->pctl)) {
 		dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
@@ -502,6 +557,8 @@ static int __devinit tegra_pinctrl_probe(struct platform_device *pdev)
 
 	pinctrl_add_gpio_range(pmx->pctl, &tegra_pinctrl_gpio_range);
 
+	pmx_test_post(pmx->pctl);
+
 	platform_set_drvdata(pdev, pmx);
 
 	dev_dbg(&pdev->dev, "Probed Tegra pinctrl driver\n");
-- 
1.7.0.4

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