提交 91492b4a 编写于 作者: M Maurus Cuelenaere 提交者: Ben Dooks

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: NMaurus Cuelenaere <mcuelenaere@gmail.com>
Signed-off-by: NBen Dooks <ben-linux@fluff.org>
上级 cf9814eb
...@@ -262,6 +262,7 @@ static irqreturn_t s3c_adc_irq(int irq, void *pw) ...@@ -262,6 +262,7 @@ static irqreturn_t s3c_adc_irq(int irq, void *pw)
{ {
struct adc_device *adc = pw; struct adc_device *adc = pw;
struct s3c_adc_client *client = adc->cur; struct s3c_adc_client *client = adc->cur;
enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data;
unsigned long flags; unsigned long flags;
unsigned data0, data1; unsigned data0, data1;
...@@ -276,9 +277,17 @@ static irqreturn_t s3c_adc_irq(int irq, void *pw) ...@@ -276,9 +277,17 @@ static irqreturn_t s3c_adc_irq(int irq, void *pw)
client->nr_samples--; 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) if (client->convert_cb)
(client->convert_cb)(client, data0 & 0x3ff, data1 & 0x3ff, (client->convert_cb)(client, data0, data1, &client->nr_samples);
&client->nr_samples);
if (client->nr_samples > 0) { if (client->nr_samples > 0) {
/* fire another conversion for this */ /* fire another conversion for this */
...@@ -295,7 +304,7 @@ static irqreturn_t s3c_adc_irq(int irq, void *pw) ...@@ -295,7 +304,7 @@ static irqreturn_t s3c_adc_irq(int irq, void *pw)
} }
exit: exit:
if (platform_get_device_id(adc->pdev)->driver_data == TYPE_S3C64XX) { if (cpu == TYPE_S3C64XX) {
/* Clear ADC interrupt */ /* Clear ADC interrupt */
writel(0, adc->regs + S3C64XX_ADCCLRINT); writel(0, adc->regs + S3C64XX_ADCCLRINT);
} }
...@@ -308,6 +317,7 @@ static int s3c_adc_probe(struct platform_device *pdev) ...@@ -308,6 +317,7 @@ static int s3c_adc_probe(struct platform_device *pdev)
struct adc_device *adc; struct adc_device *adc;
struct resource *regs; struct resource *regs;
int ret; int ret;
unsigned tmp;
adc = kzalloc(sizeof(struct adc_device), GFP_KERNEL); adc = kzalloc(sizeof(struct adc_device), GFP_KERNEL);
if (adc == NULL) { if (adc == NULL) {
...@@ -354,8 +364,12 @@ static int s3c_adc_probe(struct platform_device *pdev) ...@@ -354,8 +364,12 @@ static int s3c_adc_probe(struct platform_device *pdev)
clk_enable(adc->clk); clk_enable(adc->clk);
writel(adc->prescale | S3C2410_ADCCON_PRSCEN, tmp = adc->prescale | S3C2410_ADCCON_PRSCEN;
adc->regs + S3C2410_ADCCON); 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"); dev_info(dev, "attached adc driver\n");
......
...@@ -25,6 +25,7 @@ ...@@ -25,6 +25,7 @@
/* ADCCON Register Bits */ /* ADCCON Register Bits */
#define S3C64XX_ADCCON_RESSEL (1<<16)
#define S3C2410_ADCCON_ECFLG (1<<15) #define S3C2410_ADCCON_ECFLG (1<<15)
#define S3C2410_ADCCON_PRSCEN (1<<14) #define S3C2410_ADCCON_PRSCEN (1<<14)
#define S3C2410_ADCCON_PRSCVL(x) (((x)&0xFF)<<6) #define S3C2410_ADCCON_PRSCVL(x) (((x)&0xFF)<<6)
......
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