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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>
hifive-unleashed-5.1
Maurus Cuelenaere 2010-01-30 18:01:48 +01:00 committed by Ben Dooks
parent cf9814eb6d
commit 91492b4a04
2 changed files with 20 additions and 5 deletions
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24
arch/arm/plat-samsung/adc.c
View File

@ -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");

1
arch/arm/plat-samsung/include/plat/regs-adc.h
View File

@ -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)