linux-kernel - [PATCH v2 2/5] Samsung SoC ADC: Channel selection for S5PV210, S5PC110, and Exynos4

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Message-id: <1308621527-2457-3-git-send-email-myungjoo.ham@samsung.com>
Date:	Tue, 21 Jun 2011 10:58:44 +0900
From:	MyungJoo Ham <myungjoo.ham@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Kukjin Kim <kgene.kim@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Ben Dooks <ben-linux@...ff.org>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	dg77.kim@...sung.com, myungjoo.ham@...il.com
Subject: [PATCH v2 2/5] Samsung SoC ADC: Channel selection for S5PV210,
 S5PC110, and Exynos4

In S5PV210/S5PC110/Exynos4, ADCMUX channel selection uses ADCMUX
register, not ADCCON register. This patch corrects the behavior of
Samsung-ADC for such cpus.

Signed-off-by: MyungJoo Ham <myungjoo.ham@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
--
v2: No changes from v1. Resubmitted as a series of patches
---
 arch/arm/plat-samsung/adc.c                   |   24 +++++++++++++++++-------
 arch/arm/plat-samsung/include/plat/regs-adc.h |    1 +
 2 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/arch/arm/plat-samsung/adc.c b/arch/arm/plat-samsung/adc.c
index 938f6e9..0233c69 100644
--- a/arch/arm/plat-samsung/adc.c
+++ b/arch/arm/plat-samsung/adc.c
@@ -41,8 +41,10 @@
 
 enum s3c_cpu_type {
 	TYPE_S3C24XX,
-	TYPE_S3C64XX
+	TYPE_S3C64XX,
+	TYPE_S5P,
 };
+#define S3C64XX_OR_LATER(type)	((type) == TYPE_S3C64XX || (type) == TYPE_S5P)
 
 struct s3c_adc_client {
 	struct platform_device	*pdev;
@@ -93,6 +95,7 @@ static inline void s3c_adc_select(struct adc_device *adc,
 				  struct s3c_adc_client *client)
 {
 	unsigned con = readl(adc->regs + S3C2410_ADCCON);
+	enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data;
 
 	client->select_cb(client, 1);
 
@@ -100,8 +103,12 @@ static inline void s3c_adc_select(struct adc_device *adc,
 	con &= ~S3C2410_ADCCON_STDBM;
 	con &= ~S3C2410_ADCCON_STARTMASK;
 
-	if (!client->is_ts)
-		con |= S3C2410_ADCCON_SELMUX(client->channel);
+	if (!client->is_ts) {
+		if (cpu == TYPE_S5P)
+			writel(client->channel & 0xf, adc->regs + S5P_ADCMUX);
+		else
+			con |= S3C2410_ADCCON_SELMUX(client->channel);
+	}
 
 	writel(con, adc->regs + S3C2410_ADCCON);
 }
@@ -287,8 +294,8 @@ static irqreturn_t s3c_adc_irq(int irq, void *pw)
 
 	client->nr_samples--;
 
-	if (cpu == TYPE_S3C64XX) {
-		/* S3C64XX ADC resolution is 12-bit */
+	if (S3C64XX_OR_LATER(cpu)) {
+		/* S3C64XX/S5P ADC resolution is 12-bit */
 		data0 &= 0xfff;
 		data1 &= 0xfff;
 	} else {
@@ -314,7 +321,7 @@ static irqreturn_t s3c_adc_irq(int irq, void *pw)
 	}
 
 exit:
-	if (cpu == TYPE_S3C64XX) {
+	if (S3C64XX_OR_LATER(cpu)) {
 		/* Clear ADC interrupt */
 		writel(0, adc->regs + S3C64XX_ADCCLRINT);
 	}
@@ -388,7 +395,7 @@ static int s3c_adc_probe(struct platform_device *pdev)
 	clk_enable(adc->clk);
 
 	tmp = adc->prescale | S3C2410_ADCCON_PRSCEN;
-	if (platform_get_device_id(pdev)->driver_data == TYPE_S3C64XX) {
+	if (S3C64XX_OR_LATER(platform_get_device_id(pdev)->driver_data)) {
 		/* Enable 12-bit ADC resolution */
 		tmp |= S3C64XX_ADCCON_RESSEL;
 	}
@@ -478,6 +485,9 @@ static struct platform_device_id s3c_adc_driver_ids[] = {
 	}, {
 		.name           = "s3c64xx-adc",
 		.driver_data    = TYPE_S3C64XX,
+	}, {
+		.name		= "s5p-adc",
+		.driver_data	= TYPE_S5P,
 	},
 	{ }
 };
diff --git a/arch/arm/plat-samsung/include/plat/regs-adc.h b/arch/arm/plat-samsung/include/plat/regs-adc.h
index 7554c4f..035e8c3 100644
--- a/arch/arm/plat-samsung/include/plat/regs-adc.h
+++ b/arch/arm/plat-samsung/include/plat/regs-adc.h
@@ -21,6 +21,7 @@
 #define S3C2410_ADCDAT1	   S3C2410_ADCREG(0x10)
 #define S3C64XX_ADCUPDN		S3C2410_ADCREG(0x14)
 #define S3C64XX_ADCCLRINT	S3C2410_ADCREG(0x18)
+#define S5P_ADCMUX		S3C2410_ADCREG(0x1C)
 #define S3C64XX_ADCCLRINTPNDNUP	S3C2410_ADCREG(0x20)
 
 
-- 
1.7.4.1

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