[PATCHv2 2/3] iio: adc: exynos_adc: Add support for s3c24xx ADC
From: Chanwoo Choi
Date: Mon Jul 28 2014 - 08:45:00 EST
This patch add support for s3c2410/s3c2416/s3c2440/s3c2443 ADC. The s3c24xx
is alomost same as ADCv1. But, There are a little difference as following:
- ADCMUX register address
- ADCDAT mask (10 bit or 12 bit ADC resolution according to SoC version)
- s3c24xx/s3c64xx has not included ADC_PHY enable register
Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
---
.../devicetree/bindings/arm/samsung/exynos-adc.txt | 16 ++-
drivers/iio/adc/Kconfig | 2 +-
drivers/iio/adc/exynos_adc.c | 109 +++++++++++++++++++--
3 files changed, 114 insertions(+), 13 deletions(-)
diff --git a/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt b/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
index d3dad46..709efaa 100644
--- a/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
+++ b/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
@@ -11,15 +11,25 @@ New driver handles the following
Required properties:
- compatible: Must be "samsung,exynos-adc-v1"
- for exynos4412/5250 controllers.
+ for exynos4412/5250 and s5pv210 controllers.
Must be "samsung,exynos-adc-v2" for
future controllers.
Must be "samsung,exynos3250-adc" for
controllers compatible with ADC of Exynos3250.
+ Must be "samsung,s3c2410-adc" for
+ the ADC in s3c2410 and compatibles
+ Must be "samsung,s3c2416-adc" for
+ the ADC in s3c2416 and compatibles
+ Must be "samsung,s3c2440-adc" for
+ the ADC in s3c2440 and compatibles
+ Must be "samsung,s3c2443-adc" for
+ the ADC in s3c2443 and compatibles
Must be "samsung,s3c6410-adc" for
the ADC in s3c6410 and compatibles
-- reg: Contains ADC register address range (base address and
- length) and the address of the phy enable register.
+- reg: List of ADC register address range
+ - The base address and range of ADC register
+ - The base address and range of ADC_PHY register (every
+ SoC except for s3c24xx/s3c64xx ADC)
- interrupts: Contains the interrupt information for the timer. The
format is being dependent on which interrupt controller
the Samsung device uses.
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index a80d236..a247655 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -119,7 +119,7 @@ config AT91_ADC
config EXYNOS_ADC
tristate "Exynos ADC driver support"
- depends on ARCH_EXYNOS || (OF && COMPILE_TEST)
+ depends on ARCH_EXYNOS || ARCH_S3C24XX || ARCH_S3C64XX || (OF && COMPILE_TEST)
help
Core support for the ADC block found in the Samsung EXYNOS series
of SoCs for drivers such as the touchscreen and hwmon to use to share
diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c
index ed9e4c8..3b17faa 100644
--- a/drivers/iio/adc/exynos_adc.c
+++ b/drivers/iio/adc/exynos_adc.c
@@ -47,6 +47,9 @@
#define ADC_V1_INTCLR(x) ((x) + 0x18)
#define ADC_V1_MUX(x) ((x) + 0x1c)
+/* S3C2410 ADC registers definitions */
+#define ADC_S3C2410_MUX(x) ((x) + 0x18)
+
/* Future ADC_V2 registers definitions */
#define ADC_V2_CON1(x) ((x) + 0x00)
#define ADC_V2_CON2(x) ((x) + 0x04)
@@ -63,6 +66,8 @@
/* Bit definitions for S3C2410 ADC */
#define ADC_S3C2410_CON_SELMUX(x) (((x) & 7) << 3)
+#define ADC_S3C2410_DATX_MASK 0x3FF
+#define ADC_S3C2416_CON_RES_SEL (1u << 3)
/* Bit definitions for ADC_V2 */
#define ADC_V2_CON1_SOFT_RESET (1u << 2)
@@ -80,6 +85,7 @@
/* Bit definitions common for ADC_V1 and ADC_V2 */
#define ADC_CON_EN_START (1u << 0)
+#define ADC_CON_EN_START_MASK (0x3 << 0)
#define ADC_DATX_MASK 0xFFF
#define EXYNOS_ADC_TIMEOUT (msecs_to_jiffies(100))
@@ -103,6 +109,8 @@ struct exynos_adc {
struct exynos_adc_data {
int num_channels;
bool needs_sclk;
+ bool needs_adc_phy;
+ u32 mask;
void (*init_hw)(struct exynos_adc *info);
void (*exit_hw)(struct exynos_adc *info);
@@ -174,7 +182,8 @@ static void exynos_adc_v1_init_hw(struct exynos_adc *info)
{
u32 con1;
- writel(1, info->enable_reg);
+ if (info->data->needs_adc_phy)
+ writel(1, info->enable_reg);
/* set default prescaler values and Enable prescaler */
con1 = ADC_V1_CON_PRSCLV(49) | ADC_V1_CON_PRSCEN;
@@ -188,7 +197,8 @@ static void exynos_adc_v1_exit_hw(struct exynos_adc *info)
{
u32 con;
- writel(0, info->enable_reg);
+ if (info->data->needs_adc_phy)
+ writel(0, info->enable_reg);
con = readl(ADC_V1_CON(info->regs));
con |= ADC_V1_CON_STANDBY;
@@ -213,6 +223,8 @@ static void exynos_adc_v1_start_conv(struct exynos_adc *info,
static const struct exynos_adc_data const exynos_adc_v1_data = {
.num_channels = MAX_ADC_V1_CHANNELS,
+ .mask = ADC_DATX_MASK, /* 12 bit ADC resolution */
+ .needs_adc_phy = true,
.init_hw = exynos_adc_v1_init_hw,
.exit_hw = exynos_adc_v1_exit_hw,
@@ -220,6 +232,53 @@ static const struct exynos_adc_data const exynos_adc_v1_data = {
.start_conv = exynos_adc_v1_start_conv,
};
+static void exynos_adc_s3c2416_start_conv(struct exynos_adc *info,
+ unsigned long addr)
+{
+ u32 con1;
+
+ /* Enable 12 bit ADC resolution */
+ con1 = readl(ADC_V1_CON(info->regs));
+ con1 |= ADC_S3C2416_CON_RES_SEL;
+ writel(con1, ADC_V1_CON(info->regs));
+
+ /* Select channel for S3C2416 */
+ writel(addr, ADC_S3C2410_MUX(info->regs));
+
+ con1 = readl(ADC_V1_CON(info->regs));
+ writel(con1 | ADC_CON_EN_START, ADC_V1_CON(info->regs));
+}
+
+static struct exynos_adc_data const exynos_adc_s3c2416_data = {
+ .num_channels = MAX_ADC_V1_CHANNELS,
+ .mask = ADC_DATX_MASK, /* 12 bit ADC resolution */
+
+ .init_hw = exynos_adc_v1_init_hw,
+ .exit_hw = exynos_adc_v1_exit_hw,
+ .start_conv = exynos_adc_s3c2416_start_conv,
+};
+
+static void exynos_adc_s3c2443_start_conv(struct exynos_adc *info,
+ unsigned long addr)
+{
+ u32 con1;
+
+ /* Select channel for S3C2433 */
+ writel(addr, ADC_S3C2410_MUX(info->regs));
+
+ con1 = readl(ADC_V1_CON(info->regs));
+ writel(con1 | ADC_CON_EN_START, ADC_V1_CON(info->regs));
+}
+
+static struct exynos_adc_data const exynos_adc_s3c2443_data = {
+ .num_channels = MAX_ADC_V1_CHANNELS,
+ .mask = ADC_S3C2410_DATX_MASK, /* 10 bit ADC resolution */
+
+ .init_hw = exynos_adc_v1_init_hw,
+ .exit_hw = exynos_adc_v1_exit_hw,
+ .start_conv = exynos_adc_s3c2443_start_conv,
+};
+
static void exynos_adc_s3c64xx_start_conv(struct exynos_adc *info,
unsigned long addr)
{
@@ -231,8 +290,18 @@ static void exynos_adc_s3c64xx_start_conv(struct exynos_adc *info,
writel(con1 | ADC_CON_EN_START, ADC_V1_CON(info->regs));
}
+static struct exynos_adc_data const exynos_adc_s3c24xx_data = {
+ .num_channels = MAX_ADC_V1_CHANNELS,
+ .mask = ADC_S3C2410_DATX_MASK, /* 10 bit ADC resolution */
+
+ .init_hw = exynos_adc_v1_init_hw,
+ .exit_hw = exynos_adc_v1_exit_hw,
+ .start_conv = exynos_adc_s3c64xx_start_conv,
+};
+
static struct exynos_adc_data const exynos_adc_s3c64xx_data = {
.num_channels = MAX_ADC_V1_CHANNELS,
+ .mask = ADC_DATX_MASK, /* 12 bit ADC resolution */
.init_hw = exynos_adc_v1_init_hw,
.exit_hw = exynos_adc_v1_exit_hw,
@@ -244,7 +313,8 @@ static void exynos_adc_v2_init_hw(struct exynos_adc *info)
{
u32 con1, con2;
- writel(1, info->enable_reg);
+ if (info->data->needs_adc_phy)
+ writel(1, info->enable_reg);
con1 = ADC_V2_CON1_SOFT_RESET;
writel(con1, ADC_V2_CON1(info->regs));
@@ -261,7 +331,8 @@ static void exynos_adc_v2_exit_hw(struct exynos_adc *info)
{
u32 con;
- writel(0, info->enable_reg);
+ if (info->data->needs_adc_phy)
+ writel(0, info->enable_reg);
con = readl(ADC_V2_CON1(info->regs));
con &= ~ADC_CON_EN_START;
@@ -289,6 +360,8 @@ static void exynos_adc_v2_start_conv(struct exynos_adc *info,
static const struct exynos_adc_data const exynos_adc_v2_data = {
.num_channels = MAX_ADC_V2_CHANNELS,
+ .mask = ADC_DATX_MASK, /* 12 bit ADC resolution */
+ .needs_adc_phy = true,
.init_hw = exynos_adc_v2_init_hw,
.exit_hw = exynos_adc_v2_exit_hw,
@@ -298,7 +371,9 @@ static const struct exynos_adc_data const exynos_adc_v2_data = {
static const struct exynos_adc_data const exynos3250_adc_data = {
.num_channels = MAX_EXYNOS3250_ADC_CHANNELS,
+ .mask = ADC_DATX_MASK, /* 12 bit ADC resolution */
.needs_sclk = true,
+ .needs_adc_phy = true,
.init_hw = exynos_adc_v2_init_hw,
.exit_hw = exynos_adc_v2_exit_hw,
@@ -308,6 +383,18 @@ static const struct exynos_adc_data const exynos3250_adc_data = {
static const struct of_device_id exynos_adc_match[] = {
{
+ .compatible = "samsung,s3c2410-adc",
+ .data = &exynos_adc_s3c24xx_data,
+ }, {
+ .compatible = "samsung,s3c2416-adc",
+ .data = &exynos_adc_s3c2416_data,
+ }, {
+ .compatible = "samsung,s3c2440-adc",
+ .data = &exynos_adc_s3c24xx_data,
+ }, {
+ .compatible = "samsung,s3c2443-adc",
+ .data = &exynos_adc_s3c2443_data,
+ }, {
.compatible = "samsung,s3c6410-adc",
.data = &exynos_adc_s3c64xx_data,
}, {
@@ -373,9 +460,10 @@ static int exynos_read_raw(struct iio_dev *indio_dev,
static irqreturn_t exynos_adc_isr(int irq, void *dev_id)
{
struct exynos_adc *info = (struct exynos_adc *)dev_id;
+ u32 mask = info->data->mask;
/* Read value */
- info->value = readl(ADC_V1_DATX(info->regs)) & ADC_DATX_MASK;
+ info->value = readl(ADC_V1_DATX(info->regs)) & mask;
/* clear irq */
if (info->data->clear_irq)
@@ -468,10 +556,13 @@ static int exynos_adc_probe(struct platform_device *pdev)
if (IS_ERR(info->regs))
return PTR_ERR(info->regs);
- mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
- info->enable_reg = devm_ioremap_resource(&pdev->dev, mem);
- if (IS_ERR(info->enable_reg))
- return PTR_ERR(info->enable_reg);
+
+ if (info->data->needs_adc_phy) {
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ info->enable_reg = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(info->enable_reg))
+ return PTR_ERR(info->enable_reg);
+ }
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
--
1.8.0
--
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