linux-kernel - [PATCH 05/10] pinctrl: mvebu: dove: request additional resources

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Date:	Mon, 24 Feb 2014 09:42:57 +0100
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 05/10] pinctrl: mvebu: dove: request additional resources

Dove pinctrl also requires additional registers to control all pins.
This patch requests resources for mpp4 and pmu-mpp register ranges.
As this changes DT to driver requirements, fallback to hardcoded
resources, if the corresponding DT regs have not been set.
Also, WARN about old DT binding usage to encourage users to update
their DTBs.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Acked-by: Linus Walleij <linus.walleij@...aro.org>
---
Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Jason Cooper <jason@...edaemon.net>
Cc: Andrew Lunn <andrew@...n.ch>
Cc: Gregory Clement <gregory.clement@...e-electrons.com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/pinctrl/mvebu/pinctrl-dove.c | 45 +++++++++++++++++++++++++++++++++---
 1 file changed, 42 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/mvebu/pinctrl-dove.c b/drivers/pinctrl/mvebu/pinctrl-dove.c
index da9ca26360fd..8d57d4bc1f0c 100644
--- a/drivers/pinctrl/mvebu/pinctrl-dove.c
+++ b/drivers/pinctrl/mvebu/pinctrl-dove.c
@@ -22,6 +22,11 @@
 
 #include "pinctrl-mvebu.h"
 
+/* Internal registers can be configured at any 1 MiB aligned address */
+#define INT_REGS_MASK		~(SZ_1M - 1)
+#define MPP4_REGS_OFFS		0xd0440
+#define PMU_REGS_OFFS		0xd802c
+
 #define DOVE_SB_REGS_VIRT_BASE		IOMEM(0xfde00000)
 #define DOVE_MPP_VIRT_BASE		(DOVE_SB_REGS_VIRT_BASE + 0xd0200)
 #define DOVE_PMU_MPP_GENERAL_CTRL	(DOVE_MPP_VIRT_BASE + 0x10)
@@ -52,6 +57,8 @@
 #define CONFIG_PMU	BIT(4)
 
 static void __iomem *mpp_base;
+static void __iomem *mpp4_base;
+static void __iomem *pmu_base;
 
 static int dove_mpp_ctrl_get(unsigned pid, unsigned long *config)
 {
@@ -751,7 +758,8 @@ static struct of_device_id dove_pinctrl_of_match[] = {
 
 static int dove_pinctrl_probe(struct platform_device *pdev)
 {
-	struct resource *res;
+	struct resource *res, *mpp_res;
+	struct resource fb_res;
 	const struct of_device_id *match =
 		of_match_device(dove_pinctrl_of_match, &pdev->dev);
 	pdev->dev.platform_data = (void *)match->data;
@@ -767,11 +775,42 @@ static int dove_pinctrl_probe(struct platform_device *pdev)
 	}
 	clk_prepare_enable(clk);
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	mpp_base = devm_ioremap_resource(&pdev->dev, res);
+	mpp_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mpp_base = devm_ioremap_resource(&pdev->dev, mpp_res);
 	if (IS_ERR(mpp_base))
 		return PTR_ERR(mpp_base);
 
+	/* prepare fallback resource */
+	memcpy(&fb_res, mpp_res, sizeof(struct resource));
+	fb_res.start = 0;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (!res) {
+		dev_warn(&pdev->dev, "falling back to hardcoded MPP4 resource\n");
+		adjust_resource(&fb_res,
+			(mpp_res->start & INT_REGS_MASK) + MPP4_REGS_OFFS, 0x4);
+		res = &fb_res;
+	}
+
+	mpp4_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(mpp4_base))
+		return PTR_ERR(mpp4_base);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+	if (!res) {
+		dev_warn(&pdev->dev, "falling back to hardcoded PMU resource\n");
+		adjust_resource(&fb_res,
+			(mpp_res->start & INT_REGS_MASK) + PMU_REGS_OFFS, 0x8);
+		res = &fb_res;
+	}
+
+	pmu_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pmu_base))
+		return PTR_ERR(pmu_base);
+
+	/* Warn on any missing DT resource */
+	WARN(fb_res.start, FW_BUG "Missing pinctrl regs in DTB. Please update your firmware.\n");
+
 	return mvebu_pinctrl_probe(pdev);
 }
 
-- 
1.8.5.3

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