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authorMaurus Cuelenaere <mcuelenaere@gmail.com>2010-01-30 18:01:48 +0100
committerBen Dooks <ben-linux@fluff.org>2010-02-03 01:55:04 +0000
commit91492b4a04586e7cb191c72de9d1b22545a3ce16 (patch)
tree326e6e522f0edee936a31e1e2b83df0db0fa73c1 /arch/arm/plat-samsung
parentcf9814eb6d83f066d5db63f4144598e9c6ca2951 (diff)
ARM: SAMSUNG: Add support for 12bit ADC
The S3C64XX SoC series support 12bit ADC data, enable this and mask the data accordingly. Signed-off-by: Maurus Cuelenaere <mcuelenaere@gmail.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'arch/arm/plat-samsung')
-rw-r--r--arch/arm/plat-samsung/adc.c24
-rw-r--r--arch/arm/plat-samsung/include/plat/regs-adc.h1
2 files changed, 20 insertions, 5 deletions
diff --git a/arch/arm/plat-samsung/adc.c b/arch/arm/plat-samsung/adc.c
index c7659b7378b..81caf213572 100644
--- a/arch/arm/plat-samsung/adc.c
+++ b/arch/arm/plat-samsung/adc.c
@@ -262,6 +262,7 @@ static irqreturn_t s3c_adc_irq(int irq, void *pw)
{
struct adc_device *adc = pw;
struct s3c_adc_client *client = adc->cur;
+ enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data;
unsigned long flags;
unsigned data0, data1;
@@ -276,9 +277,17 @@ static irqreturn_t s3c_adc_irq(int irq, void *pw)
client->nr_samples--;
+ if (cpu == TYPE_S3C64XX) {
+ /* S3C64XX ADC resolution is 12-bit */
+ data0 &= 0xfff;
+ data1 &= 0xfff;
+ } else {
+ data0 &= 0x3ff;
+ data1 &= 0x3ff;
+ }
+
if (client->convert_cb)
- (client->convert_cb)(client, data0 & 0x3ff, data1 & 0x3ff,
- &client->nr_samples);
+ (client->convert_cb)(client, data0, data1, &client->nr_samples);
if (client->nr_samples > 0) {
/* fire another conversion for this */
@@ -295,7 +304,7 @@ static irqreturn_t s3c_adc_irq(int irq, void *pw)
}
exit:
- if (platform_get_device_id(adc->pdev)->driver_data == TYPE_S3C64XX) {
+ if (cpu == TYPE_S3C64XX) {
/* Clear ADC interrupt */
writel(0, adc->regs + S3C64XX_ADCCLRINT);
}
@@ -308,6 +317,7 @@ static int s3c_adc_probe(struct platform_device *pdev)
struct adc_device *adc;
struct resource *regs;
int ret;
+ unsigned tmp;
adc = kzalloc(sizeof(struct adc_device), GFP_KERNEL);
if (adc == NULL) {
@@ -354,8 +364,12 @@ static int s3c_adc_probe(struct platform_device *pdev)
clk_enable(adc->clk);
- writel(adc->prescale | S3C2410_ADCCON_PRSCEN,
- adc->regs + S3C2410_ADCCON);
+ tmp = adc->prescale | S3C2410_ADCCON_PRSCEN;
+ if (platform_get_device_id(pdev)->driver_data == TYPE_S3C64XX) {
+ /* Enable 12-bit ADC resolution */
+ tmp |= S3C64XX_ADCCON_RESSEL;
+ }
+ writel(tmp, adc->regs + S3C2410_ADCCON);
dev_info(dev, "attached adc driver\n");
diff --git a/arch/arm/plat-samsung/include/plat/regs-adc.h b/arch/arm/plat-samsung/include/plat/regs-adc.h
index f43c8dab39e..7554c4fcddb 100644
--- a/arch/arm/plat-samsung/include/plat/regs-adc.h
+++ b/arch/arm/plat-samsung/include/plat/regs-adc.h
@@ -25,6 +25,7 @@
/* ADCCON Register Bits */
+#define S3C64XX_ADCCON_RESSEL (1<<16)
#define S3C2410_ADCCON_ECFLG (1<<15)
#define S3C2410_ADCCON_PRSCEN (1<<14)
#define S3C2410_ADCCON_PRSCVL(x) (((x)&0xFF)<<6)