Re: [PATCHv2 2/3] iio: adc: exynos_adc: Add support for s3c24xx ADC
From: Jonathan Cameron
Date: Thu Aug 07 2014 - 12:51:53 EST
On 28/07/14 13:44, Chanwoo Choi wrote:
> 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>
Applied - with a little bit of fuzz and pushed out as testing for the autobuilders
to play with it.
Thanks
Jonathan
> ---
> .../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) {
>
--
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