Re: [PATCH v2 04/10] iio: adc: at91-sama5d2_adc: convert to platform specific data structures

Eugen.Hristev
2021-08-30T12:34:02Z

On 8/24/21 2:54 PM, Eugen Hristev wrote:
> Convert the driver to platform specific structures. This means:
> - create a register layout struct that will hold offsets for registers
> - create a platform struct that will hold platform information (number of
> channels, indexes for different channels and pointer to layout struct)
> - convert specific macros that are platform dependent into platform variables
>
> This step is in fact a no-op, but allows the driver to be more flexible
> and for future enhancement including adding new platforms that are partly
> compatible with the current driver and differ slightly in register layout
> or capabilities for example.
>
> Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
> ---
> drivers/iio/adc/at91-sama5d2_adc.c | 410 +++++++++++++++++------------
> 1 file changed, 247 insertions(+), 163 deletions(-)
>
> diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
> index 9d71dcffcf93..8ede18b8d789 100644
> --- a/drivers/iio/adc/at91-sama5d2_adc.c
> +++ b/drivers/iio/adc/at91-sama5d2_adc.c
> @@ -27,8 +27,9 @@
> #include <linux/pinctrl/consumer.h>
> #include <linux/regulator/consumer.h>
>
> +struct at91_adc_reg_layout {
> /* Control Register */
> -#define AT91_SAMA5D2_CR 0x00
> + u16 CR;
> /* Software Reset */
> #define AT91_SAMA5D2_CR_SWRST BIT(0)
> /* Start Conversion */
> @@ -39,7 +40,7 @@
> #define AT91_SAMA5D2_CR_CMPRST BIT(4)
>
> /* Mode Register */
> -#define AT91_SAMA5D2_MR 0x04
> + u16 MR;
> /* Trigger Selection */
> #define AT91_SAMA5D2_MR_TRGSEL(v) ((v) << 1)
> /* ADTRG */
> @@ -82,19 +83,19 @@
> #define AT91_SAMA5D2_MR_USEQ BIT(31)
>
> /* Channel Sequence Register 1 */
> -#define AT91_SAMA5D2_SEQR1 0x08
> + u16 SEQR1;
> /* Channel Sequence Register 2 */
> -#define AT91_SAMA5D2_SEQR2 0x0c
> + u16 SEQR2;
> /* Channel Enable Register */
> -#define AT91_SAMA5D2_CHER 0x10
> + u16 CHER;
> /* Channel Disable Register */
> -#define AT91_SAMA5D2_CHDR 0x14
> + u16 CHDR;
> /* Channel Status Register */
> -#define AT91_SAMA5D2_CHSR 0x18
> + u16 CHSR;
> /* Last Converted Data Register */
> -#define AT91_SAMA5D2_LCDR 0x20
> + u16 LCDR;
> /* Interrupt Enable Register */
> -#define AT91_SAMA5D2_IER 0x24
> + u16 IER;
> /* Interrupt Enable Register - TS X measurement ready */
> #define AT91_SAMA5D2_IER_XRDY BIT(20)
> /* Interrupt Enable Register - TS Y measurement ready */
> @@ -109,22 +110,23 @@
> #define AT91_SAMA5D2_IER_PEN BIT(29)
> /* Interrupt Enable Register - No pen detect */
> #define AT91_SAMA5D2_IER_NOPEN BIT(30)
> +
> /* Interrupt Disable Register */
> -#define AT91_SAMA5D2_IDR 0x28
> + u16 IDR;
> /* Interrupt Mask Register */
> -#define AT91_SAMA5D2_IMR 0x2c
> + u16 IMR;
> /* Interrupt Status Register */
> -#define AT91_SAMA5D2_ISR 0x30
> + u16 ISR;
> /* Interrupt Status Register - Pen touching sense status */
> #define AT91_SAMA5D2_ISR_PENS BIT(31)
> /* Last Channel Trigger Mode Register */
> -#define AT91_SAMA5D2_LCTMR 0x34
> + u16 LCTMR;
> /* Last Channel Compare Window Register */
> -#define AT91_SAMA5D2_LCCWR 0x38
> + u16 LCCWR;
> /* Overrun Status Register */
> -#define AT91_SAMA5D2_OVER 0x3c
> + u16 OVER;
> /* Extended Mode Register */
> -#define AT91_SAMA5D2_EMR 0x40
> + u16 EMR;
> /* Extended Mode Register - Oversampling rate */
> #define AT91_SAMA5D2_EMR_OSR(V) ((V) << 16)
> #define AT91_SAMA5D2_EMR_OSR_MASK GENMASK(17, 16)
> @@ -134,22 +136,22 @@
>
> /* Extended Mode Register - Averaging on single trigger event */
> #define AT91_SAMA5D2_EMR_ASTE(V) ((V) << 20)
> +
> /* Compare Window Register */
> -#define AT91_SAMA5D2_CWR 0x44
> + u16 CWR;
> /* Channel Gain Register */
> -#define AT91_SAMA5D2_CGR 0x48
> -
> + u16 CGR;
> /* Channel Offset Register */
> -#define AT91_SAMA5D2_COR 0x4c
> + u16 COR;
> #define AT91_SAMA5D2_COR_DIFF_OFFSET 16
>
> /* Analog Control Register */
> -#define AT91_SAMA5D2_ACR 0x94
> + u16 ACR;
> /* Analog Control Register - Pen detect sensitivity mask */
> #define AT91_SAMA5D2_ACR_PENDETSENS_MASK GENMASK(1, 0)
>
> /* Touchscreen Mode Register */
> -#define AT91_SAMA5D2_TSMR 0xb0
> + u16 TSMR;
> /* Touchscreen Mode Register - No touch mode */
> #define AT91_SAMA5D2_TSMR_TSMODE_NONE 0
> /* Touchscreen Mode Register - 4 wire screen, no pressure measurement */
> @@ -178,13 +180,13 @@
> #define AT91_SAMA5D2_TSMR_PENDET_ENA BIT(24)
>
> /* Touchscreen X Position Register */
> -#define AT91_SAMA5D2_XPOSR 0xb4
> + u16 XPOSR;
> /* Touchscreen Y Position Register */
> -#define AT91_SAMA5D2_YPOSR 0xb8
> + u16 YPOSR;
> /* Touchscreen Pressure Register */
> -#define AT91_SAMA5D2_PRESSR 0xbc
> + u16 PRESSR;
> /* Trigger Register */
> -#define AT91_SAMA5D2_TRGR 0xc0
> + u16 TRGR;
> /* Mask for TRGMOD field of TRGR register */
> #define AT91_SAMA5D2_TRGR_TRGMOD_MASK GENMASK(2, 0)
> /* No trigger, only software trigger can start conversions */
> @@ -203,30 +205,52 @@
> #define AT91_SAMA5D2_TRGR_TRGPER(x) ((x) << 16)
>
> /* Correction Select Register */
> -#define AT91_SAMA5D2_COSR 0xd0
> + u16 COSR;
> /* Correction Value Register */
> -#define AT91_SAMA5D2_CVR 0xd4
> + u16 CVR;
> /* Channel Error Correction Register */
> -#define AT91_SAMA5D2_CECR 0xd8
> + u16 CECR;
> /* Write Protection Mode Register */
> -#define AT91_SAMA5D2_WPMR 0xe4
> + u16 WPMR;
> /* Write Protection Status Register */
> -#define AT91_SAMA5D2_WPSR 0xe8
> + u16 WPSR;
> /* Version Register */
> -#define AT91_SAMA5D2_VERSION 0xfc
> -
> -#define AT91_SAMA5D2_HW_TRIG_CNT 3
> -#define AT91_SAMA5D2_SINGLE_CHAN_CNT 12
> -#define AT91_SAMA5D2_DIFF_CHAN_CNT 6
> -
> -#define AT91_SAMA5D2_TIMESTAMP_CHAN_IDX (AT91_SAMA5D2_SINGLE_CHAN_CNT + \
> - AT91_SAMA5D2_DIFF_CHAN_CNT + 1)
> + u16 VERSION;
> +};
>
> -#define AT91_SAMA5D2_TOUCH_X_CHAN_IDX (AT91_SAMA5D2_SINGLE_CHAN_CNT + \
> - AT91_SAMA5D2_DIFF_CHAN_CNT * 2)

Hi Jonathan,

While we are here, regarding the above line, I cannot tell why did I
multiply by two the differential channel count. This makes some gaps in
the number of channels when we put them all in the same table.

I did not change this as it would break the ABI regarding the bindings
for the touchscreen #adc-cells phandle references.

However, I am thinking if there was a reason for it or it was a slip
when I initially wrote this.

Do you think there is any reason to change it and tighten the holes in
the indexes list ?

Eugen

> -#define AT91_SAMA5D2_TOUCH_Y_CHAN_IDX (AT91_SAMA5D2_TOUCH_X_CHAN_IDX + 1)
> -#define AT91_SAMA5D2_TOUCH_P_CHAN_IDX (AT91_SAMA5D2_TOUCH_Y_CHAN_IDX + 1)
> -#define AT91_SAMA5D2_MAX_CHAN_IDX AT91_SAMA5D2_TOUCH_P_CHAN_IDX
> +static const struct at91_adc_reg_layout sama5d2_layout = {
> + .CR = 0x00,
> + .MR = 0x04,
> + .SEQR1 = 0x08,
> + .SEQR2 = 0x0c,
> + .CHER = 0x10,
> + .CHDR = 0x14,
> + .CHSR = 0x18,
> + .LCDR = 0x20,
> + .IER = 0x24,
> + .IDR = 0x28,
> + .IMR = 0x2c,
> + .ISR = 0x30,
> + .LCTMR = 0x34,
> + .LCCWR = 0x38,
> + .OVER = 0x3c,
> + .EMR = 0x40,
> + .CWR = 0x44,
> + .CGR = 0x48,
> + .COR = 0x4c,
> + .ACR = 0x94,
> + .TSMR = 0xb0,
> + .XPOSR = 0xb4,
> + .YPOSR = 0xb8,
> + .PRESSR = 0xbc,
> + .TRGR = 0xc0,
> + .COSR = 0xd0,
> + .CVR = 0xd4,
> + .CECR = 0xd8,
> + .WPMR = 0xe4,
> + .WPSR = 0xe8,
> + .VERSION = 0xfc,
> +};
>
> #define AT91_SAMA5D2_TOUCH_SAMPLE_PERIOD_US 2000 /* 2ms */
> #define AT91_SAMA5D2_TOUCH_PEN_DETECT_DEBOUNCE_US 200
> @@ -235,18 +259,6 @@
>
> #define AT91_SAMA5D2_MAX_POS_BITS 12
>
> -/*
> - * Maximum number of bytes to hold conversion from all channels
> - * without the timestamp.
> - */
> -#define AT91_BUFFER_MAX_CONVERSION_BYTES ((AT91_SAMA5D2_SINGLE_CHAN_CNT + \
> - AT91_SAMA5D2_DIFF_CHAN_CNT) * 2)
> -
> -/* This total must also include the timestamp */
> -#define AT91_BUFFER_MAX_BYTES (AT91_BUFFER_MAX_CONVERSION_BYTES + 8)
> -
> -#define AT91_BUFFER_MAX_HWORDS (AT91_BUFFER_MAX_BYTES / 2)
> -
> #define AT91_HWFIFO_MAX_SIZE_STR "128"
> #define AT91_HWFIFO_MAX_SIZE 128
>
> @@ -255,12 +267,12 @@
> #define AT91_OSR_4SAMPLES 4
> #define AT91_OSR_16SAMPLES 16
>
> -#define AT91_SAMA5D2_CHAN_SINGLE(num, addr) \
> +#define AT91_SAMA5D2_CHAN_SINGLE(index, num, addr) \
> { \
> .type = IIO_VOLTAGE, \
> .channel = num, \
> .address = addr, \
> - .scan_index = num, \
> + .scan_index = index, \
> .scan_type = { \
> .sign = 'u', \
> .realbits = 14, \
> @@ -274,14 +286,14 @@
> .indexed = 1, \
> }
>
> -#define AT91_SAMA5D2_CHAN_DIFF(num, num2, addr) \
> +#define AT91_SAMA5D2_CHAN_DIFF(index, num, num2, addr) \
> { \
> .type = IIO_VOLTAGE, \
> .differential = 1, \
> .channel = num, \
> .channel2 = num2, \
> .address = addr, \
> - .scan_index = num + AT91_SAMA5D2_SINGLE_CHAN_CNT, \
> + .scan_index = index, \
> .scan_type = { \
> .sign = 's', \
> .realbits = 14, \
> @@ -328,13 +340,48 @@
> .datasheet_name = name, \
> }
>
> -#define at91_adc_readl(st, reg) readl_relaxed(st->base + reg)
> -#define at91_adc_writel(st, reg, val) writel_relaxed(val, st->base + reg)
> +#define at91_adc_readl(st, reg) \
> + readl_relaxed((st)->base + (st)->soc_info.platform->layout->reg)
> +#define at91_adc_read_chan(st, reg) \
> + readl_relaxed((st)->base + reg)
> +#define at91_adc_writel(st, reg, val) \
> + writel_relaxed(val, (st)->base + (st)->soc_info.platform->layout->reg)
> +
> +/**
> + * struct at91_adc_platform - at91-sama5d2 platform information struct
> + * @layout: pointer to the reg layout struct
> + * @adc_channels: pointer to an array of channels for registering in
> + * the iio subsystem
> + * @nr_channels: number of physical channels available
> + * @touch_chan_x: index of the touchscreen X channel
> + * @touch_chan_y: index of the touchscreen Y channel
> + * @touch_chan_p: index of the touchscreen P channel
> + * @max_channels: number of total channels
> + * @hw_trig_cnt: number of possible hardware triggers
> + */
> +struct at91_adc_platform {
> + const struct at91_adc_reg_layout *layout;
> + const struct iio_chan_spec (*adc_channels)[];
> + unsigned int nr_channels;
> + unsigned int touch_chan_x;
> + unsigned int touch_chan_y;
> + unsigned int touch_chan_p;
> + unsigned int max_channels;
> + unsigned int hw_trig_cnt;
> +};
>
> +/**
> + * struct at91_adc_soc_info - at91-sama5d2 soc information struct
> + * @startup_time: device startup time
> + * @min_sample_rate: minimum sample rate in Hz
> + * @max_sample_rate: maximum sample rate in Hz
> + * @platform: pointer to the platform structure
> + */
> struct at91_adc_soc_info {
> unsigned startup_time;
> unsigned min_sample_rate;
> unsigned max_sample_rate;
> + const struct at91_adc_platform *platform;
> };
>
> struct at91_adc_trigger {
> @@ -382,6 +429,15 @@ struct at91_adc_touch {
> struct work_struct workq;
> };
>
> +/*
> + * Buffer size requirements:
> + * No channels * bytes_per_channel(2) + timestamp bytes (8)
> + * Divided by 2 because we need half words.
> + * We assume 32 channels for now, has to be increased if needed.
> + * Nobody minds a buffer being too big.
> + */
> +#define AT91_BUFFER_MAX_HWORDS ((32 * 2 + 8) / 2)
> +
> struct at91_adc_state {
> void __iomem *base;
> int irq;
> @@ -437,29 +493,49 @@ static const struct at91_adc_trigger at91_adc_trigger_list[] = {
> },
> };
>
> -static const struct iio_chan_spec at91_adc_channels[] = {
> - AT91_SAMA5D2_CHAN_SINGLE(0, 0x50),
> - AT91_SAMA5D2_CHAN_SINGLE(1, 0x54),
> - AT91_SAMA5D2_CHAN_SINGLE(2, 0x58),
> - AT91_SAMA5D2_CHAN_SINGLE(3, 0x5c),
> - AT91_SAMA5D2_CHAN_SINGLE(4, 0x60),
> - AT91_SAMA5D2_CHAN_SINGLE(5, 0x64),
> - AT91_SAMA5D2_CHAN_SINGLE(6, 0x68),
> - AT91_SAMA5D2_CHAN_SINGLE(7, 0x6c),
> - AT91_SAMA5D2_CHAN_SINGLE(8, 0x70),
> - AT91_SAMA5D2_CHAN_SINGLE(9, 0x74),
> - AT91_SAMA5D2_CHAN_SINGLE(10, 0x78),
> - AT91_SAMA5D2_CHAN_SINGLE(11, 0x7c),
> - AT91_SAMA5D2_CHAN_DIFF(0, 1, 0x50),
> - AT91_SAMA5D2_CHAN_DIFF(2, 3, 0x58),
> - AT91_SAMA5D2_CHAN_DIFF(4, 5, 0x60),
> - AT91_SAMA5D2_CHAN_DIFF(6, 7, 0x68),
> - AT91_SAMA5D2_CHAN_DIFF(8, 9, 0x70),
> - AT91_SAMA5D2_CHAN_DIFF(10, 11, 0x78),
> - IIO_CHAN_SOFT_TIMESTAMP(AT91_SAMA5D2_TIMESTAMP_CHAN_IDX),
> - AT91_SAMA5D2_CHAN_TOUCH(AT91_SAMA5D2_TOUCH_X_CHAN_IDX, "x", IIO_MOD_X),
> - AT91_SAMA5D2_CHAN_TOUCH(AT91_SAMA5D2_TOUCH_Y_CHAN_IDX, "y", IIO_MOD_Y),
> - AT91_SAMA5D2_CHAN_PRESSURE(AT91_SAMA5D2_TOUCH_P_CHAN_IDX, "pressure"),
> +static const struct iio_chan_spec at91_sama5d2_adc_channels[] = {
> + AT91_SAMA5D2_CHAN_SINGLE(0, 0, 0x50),
> + AT91_SAMA5D2_CHAN_SINGLE(1, 1, 0x54),
> + AT91_SAMA5D2_CHAN_SINGLE(2, 2, 0x58),
> + AT91_SAMA5D2_CHAN_SINGLE(3, 3, 0x5c),
> + AT91_SAMA5D2_CHAN_SINGLE(4, 4, 0x60),
> + AT91_SAMA5D2_CHAN_SINGLE(5, 5, 0x64),
> + AT91_SAMA5D2_CHAN_SINGLE(6, 6, 0x68),
> + AT91_SAMA5D2_CHAN_SINGLE(7, 7, 0x6c),
> + AT91_SAMA5D2_CHAN_SINGLE(8, 8, 0x70),
> + AT91_SAMA5D2_CHAN_SINGLE(9, 9, 0x74),
> + AT91_SAMA5D2_CHAN_SINGLE(10, 10, 0x78),
> + AT91_SAMA5D2_CHAN_SINGLE(11, 11, 0x7c),
> + AT91_SAMA5D2_CHAN_DIFF(12, 0, 1, 0x50),
> + AT91_SAMA5D2_CHAN_DIFF(13, 2, 3, 0x58),
> + AT91_SAMA5D2_CHAN_DIFF(14, 4, 5, 0x60),
> + AT91_SAMA5D2_CHAN_DIFF(15, 6, 7, 0x68),
> + AT91_SAMA5D2_CHAN_DIFF(16, 8, 9, 0x70),
> + AT91_SAMA5D2_CHAN_DIFF(17, 10, 11, 0x78),
> + IIO_CHAN_SOFT_TIMESTAMP(18),
> + AT91_SAMA5D2_CHAN_TOUCH(19, "x", IIO_MOD_X),
> + AT91_SAMA5D2_CHAN_TOUCH(20, "y", IIO_MOD_Y),
> + AT91_SAMA5D2_CHAN_PRESSURE(21, "pressure"),
> +};
> +
> +static const struct at91_adc_platform sama5d2_platform = {
> + .layout = &sama5d2_layout,
> + .adc_channels = &at91_sama5d2_adc_channels,
> +#define AT91_SAMA5D2_SINGLE_CHAN_CNT 12
> +#define AT91_SAMA5D2_DIFF_CHAN_CNT 6
> + .nr_channels = AT91_SAMA5D2_SINGLE_CHAN_CNT +
> + AT91_SAMA5D2_DIFF_CHAN_CNT,
> +#define AT91_SAMA5D2_TOUCH_X_CHAN_IDX (AT91_SAMA5D2_SINGLE_CHAN_CNT + \
> + AT91_SAMA5D2_DIFF_CHAN_CNT * 2)
> + .touch_chan_x = AT91_SAMA5D2_TOUCH_X_CHAN_IDX,
> +#define AT91_SAMA5D2_TOUCH_Y_CHAN_IDX (AT91_SAMA5D2_TOUCH_X_CHAN_IDX + 1)
> + .touch_chan_y = AT91_SAMA5D2_TOUCH_Y_CHAN_IDX,
> +#define AT91_SAMA5D2_TOUCH_P_CHAN_IDX (AT91_SAMA5D2_TOUCH_Y_CHAN_IDX + 1)
> + .touch_chan_p = AT91_SAMA5D2_TOUCH_P_CHAN_IDX,
> +#define AT91_SAMA5D2_MAX_CHAN_IDX AT91_SAMA5D2_TOUCH_P_CHAN_IDX
> + .max_channels = ARRAY_SIZE(at91_sama5d2_adc_channels),
> +#define AT91_SAMA5D2_HW_TRIG_CNT 3
> + .hw_trig_cnt = AT91_SAMA5D2_HW_TRIG_CNT,
> };
>
> static int at91_adc_chan_xlate(struct iio_dev *indio_dev, int chan)
> @@ -493,6 +569,7 @@ static unsigned int at91_adc_active_scan_mask_to_reg(struct iio_dev *indio_dev)
> {
> u32 mask = 0;
> u8 bit;
> + struct at91_adc_state *st = iio_priv(indio_dev);
>
> for_each_set_bit(bit, indio_dev->active_scan_mask,
> indio_dev->num_channels) {
> @@ -501,13 +578,13 @@ static unsigned int at91_adc_active_scan_mask_to_reg(struct iio_dev *indio_dev)
> mask |= BIT(chan->channel);
> }
>
> - return mask & GENMASK(11, 0);
> + return mask & GENMASK(st->soc_info.platform->nr_channels, 0);
> }
>
> static void at91_adc_config_emr(struct at91_adc_state *st)
> {
> /* configure the extended mode register */
> - unsigned int emr = at91_adc_readl(st, AT91_SAMA5D2_EMR);
> + unsigned int emr = at91_adc_readl(st, EMR);
>
> /* select oversampling per single trigger event */
> emr |= AT91_SAMA5D2_EMR_ASTE(1);
> @@ -531,7 +608,7 @@ static void at91_adc_config_emr(struct at91_adc_state *st)
> break;
> }
>
> - at91_adc_writel(st, AT91_SAMA5D2_EMR, emr);
> + at91_adc_writel(st, EMR, emr);
> }
>
> static int at91_adc_adjust_val_osr(struct at91_adc_state *st, int *val)
> @@ -584,9 +661,9 @@ static int at91_adc_configure_touch(struct at91_adc_state *st, bool state)
>
> if (!state) {
> /* disabling touch IRQs and setting mode to no touch enabled */
> - at91_adc_writel(st, AT91_SAMA5D2_IDR,
> + at91_adc_writel(st, IDR,
> AT91_SAMA5D2_IER_PEN | AT91_SAMA5D2_IER_NOPEN);
> - at91_adc_writel(st, AT91_SAMA5D2_TSMR, 0);
> + at91_adc_writel(st, TSMR, 0);
> return 0;
> }
> /*
> @@ -612,19 +689,19 @@ static int at91_adc_configure_touch(struct at91_adc_state *st, bool state)
> tsmr |= AT91_SAMA5D2_TSMR_PENDET_ENA;
> tsmr |= AT91_SAMA5D2_TSMR_TSFREQ(2) & AT91_SAMA5D2_TSMR_TSFREQ_MASK;
>
> - at91_adc_writel(st, AT91_SAMA5D2_TSMR, tsmr);
> + at91_adc_writel(st, TSMR, tsmr);
>
> - acr = at91_adc_readl(st, AT91_SAMA5D2_ACR);
> + acr = at91_adc_readl(st, ACR);
> acr &= ~AT91_SAMA5D2_ACR_PENDETSENS_MASK;
> acr |= 0x02 & AT91_SAMA5D2_ACR_PENDETSENS_MASK;
> - at91_adc_writel(st, AT91_SAMA5D2_ACR, acr);
> + at91_adc_writel(st, ACR, acr);
>
> /* Sample Period Time = (TRGPER + 1) / ADCClock */
> st->touch_st.sample_period_val =
> round_up((AT91_SAMA5D2_TOUCH_SAMPLE_PERIOD_US *
> clk_khz / 1000) - 1, 1);
> /* enable pen detect IRQ */
> - at91_adc_writel(st, AT91_SAMA5D2_IER, AT91_SAMA5D2_IER_PEN);
> + at91_adc_writel(st, IER, AT91_SAMA5D2_IER_PEN);
>
> return 0;
> }
> @@ -640,7 +717,11 @@ static u16 at91_adc_touch_pos(struct at91_adc_state *st, int reg)
> * max = 2^AT91_SAMA5D2_MAX_POS_BITS - 1
> */
> /* first half of register is the x or y, second half is the scale */
> - val = at91_adc_readl(st, reg);
> + if (reg == st->soc_info.platform->layout->XPOSR)
> + val = at91_adc_readl(st, XPOSR);
> + else if (reg == st->soc_info.platform->layout->YPOSR)
> + val = at91_adc_readl(st, YPOSR);
> +
> if (!val)
> dev_dbg(&st->indio_dev->dev, "pos is 0\n");
>
> @@ -658,13 +739,13 @@ static u16 at91_adc_touch_pos(struct at91_adc_state *st, int reg)
>
> static u16 at91_adc_touch_x_pos(struct at91_adc_state *st)
> {
> - st->touch_st.x_pos = at91_adc_touch_pos(st, AT91_SAMA5D2_XPOSR);
> + st->touch_st.x_pos = at91_adc_touch_pos(st, st->soc_info.platform->layout->XPOSR);
> return st->touch_st.x_pos;
> }
>
> static u16 at91_adc_touch_y_pos(struct at91_adc_state *st)
> {
> - return at91_adc_touch_pos(st, AT91_SAMA5D2_YPOSR);
> + return at91_adc_touch_pos(st, st->soc_info.platform->layout->YPOSR);
> }
>
> static u16 at91_adc_touch_pressure(struct at91_adc_state *st)
> @@ -676,7 +757,7 @@ static u16 at91_adc_touch_pressure(struct at91_adc_state *st)
> u32 factor = 1000;
>
> /* calculate the pressure */
> - val = at91_adc_readl(st, AT91_SAMA5D2_PRESSR);
> + val = at91_adc_readl(st, PRESSR);
> z1 = val & AT91_SAMA5D2_XYZ_MASK;
> z2 = (val >> 16) & AT91_SAMA5D2_XYZ_MASK;
>
> @@ -700,9 +781,9 @@ static int at91_adc_read_position(struct at91_adc_state *st, int chan, u16 *val)
> *val = 0;
> if (!st->touch_st.touching)
> return -ENODATA;
> - if (chan == AT91_SAMA5D2_TOUCH_X_CHAN_IDX)
> + if (chan == st->soc_info.platform->touch_chan_x)
> *val = at91_adc_touch_x_pos(st);
> - else if (chan == AT91_SAMA5D2_TOUCH_Y_CHAN_IDX)
> + else if (chan == st->soc_info.platform->touch_chan_y)
> *val = at91_adc_touch_y_pos(st);
> else
> return -ENODATA;
> @@ -715,7 +796,7 @@ static int at91_adc_read_pressure(struct at91_adc_state *st, int chan, u16 *val)
> *val = 0;
> if (!st->touch_st.touching)
> return -ENODATA;
> - if (chan == AT91_SAMA5D2_TOUCH_P_CHAN_IDX)
> + if (chan == st->soc_info.platform->touch_chan_y)
> *val = at91_adc_touch_pressure(st);
> else
> return -ENODATA;
> @@ -727,7 +808,7 @@ static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state)
> {
> struct iio_dev *indio = iio_trigger_get_drvdata(trig);
> struct at91_adc_state *st = iio_priv(indio);
> - u32 status = at91_adc_readl(st, AT91_SAMA5D2_TRGR);
> + u32 status = at91_adc_readl(st, TRGR);
>
> /* clear TRGMOD */
> status &= ~AT91_SAMA5D2_TRGR_TRGMOD_MASK;
> @@ -736,7 +817,7 @@ static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state)
> status |= st->selected_trig->trgmod_value;
>
> /* set/unset hw trigger */
> - at91_adc_writel(st, AT91_SAMA5D2_TRGR, status);
> + at91_adc_writel(st, TRGR, status);
>
> return 0;
> }
> @@ -753,7 +834,7 @@ static void at91_adc_reenable_trigger(struct iio_trigger *trig)
> enable_irq(st->irq);
>
> /* Needed to ACK the DRDY interruption */
> - at91_adc_readl(st, AT91_SAMA5D2_LCDR);
> + at91_adc_readl(st, LCDR);
> }
>
> static const struct iio_trigger_ops at91_adc_trigger_ops = {
> @@ -848,7 +929,7 @@ static int at91_adc_dma_start(struct iio_dev *indio_dev)
> }
>
> /* enable general overrun error signaling */
> - at91_adc_writel(st, AT91_SAMA5D2_IER, AT91_SAMA5D2_IER_GOVRE);
> + at91_adc_writel(st, IER, AT91_SAMA5D2_IER_GOVRE);
> /* Issue pending DMA requests */
> dma_async_issue_pending(st->dma_st.dma_chan);
>
> @@ -878,7 +959,7 @@ static bool at91_adc_current_chan_is_touch(struct iio_dev *indio_dev)
>
> return !!bitmap_subset(indio_dev->active_scan_mask,
> &st->touch_st.channels_bitmask,
> - AT91_SAMA5D2_MAX_CHAN_IDX + 1);
> + st->soc_info.platform->max_channels + 1);
> }
>
> static int at91_adc_buffer_prepare(struct iio_dev *indio_dev)
> @@ -915,7 +996,7 @@ static int at91_adc_buffer_prepare(struct iio_dev *indio_dev)
> chan->type == IIO_PRESSURE)
> continue;
>
> - cor = at91_adc_readl(st, AT91_SAMA5D2_COR);
> + cor = at91_adc_readl(st, COR);
>
> if (chan->differential)
> cor |= (BIT(chan->channel) | BIT(chan->channel2)) <<
> @@ -924,13 +1005,13 @@ static int at91_adc_buffer_prepare(struct iio_dev *indio_dev)
> cor &= ~(BIT(chan->channel) <<
> AT91_SAMA5D2_COR_DIFF_OFFSET);
>
> - at91_adc_writel(st, AT91_SAMA5D2_COR, cor);
> + at91_adc_writel(st, COR, cor);
>
> - at91_adc_writel(st, AT91_SAMA5D2_CHER, BIT(chan->channel));
> + at91_adc_writel(st, CHER, BIT(chan->channel));
> }
>
> if (at91_adc_buffer_check_use_irq(indio_dev, st))
> - at91_adc_writel(st, AT91_SAMA5D2_IER, AT91_SAMA5D2_IER_DRDY);
> + at91_adc_writel(st, IER, AT91_SAMA5D2_IER_DRDY);
>
> return 0;
> }
> @@ -966,17 +1047,17 @@ static int at91_adc_buffer_postdisable(struct iio_dev *indio_dev)
> chan->type == IIO_PRESSURE)
> continue;
>
> - at91_adc_writel(st, AT91_SAMA5D2_CHDR, BIT(chan->channel));
> + at91_adc_writel(st, CHDR, BIT(chan->channel));
>
> if (st->dma_st.dma_chan)
> - at91_adc_readl(st, chan->address);
> + at91_adc_read_chan(st, chan->address);
> }
>
> if (at91_adc_buffer_check_use_irq(indio_dev, st))
> - at91_adc_writel(st, AT91_SAMA5D2_IDR, AT91_SAMA5D2_IER_DRDY);
> + at91_adc_writel(st, IDR, AT91_SAMA5D2_IER_DRDY);
>
> /* read overflow register to clear possible overflow status */
> - at91_adc_readl(st, AT91_SAMA5D2_OVER);
> + at91_adc_readl(st, OVER);
>
> /* if we are using DMA we must clear registers and end DMA */
> if (st->dma_st.dma_chan)
> @@ -1024,7 +1105,7 @@ static void at91_adc_trigger_handler_nodma(struct iio_dev *indio_dev,
> * Check if the conversion is ready. If not, wait a little bit, and
> * in case of timeout exit with an error.
> */
> - while ((at91_adc_readl(st, AT91_SAMA5D2_ISR) & mask) != mask &&
> + while ((at91_adc_readl(st, ISR) & mask) != mask &&
> timeout) {
> usleep_range(50, 100);
> timeout--;
> @@ -1052,7 +1133,7 @@ static void at91_adc_trigger_handler_nodma(struct iio_dev *indio_dev,
> * Thus, emit a warning.
> */
> if (chan->type == IIO_VOLTAGE) {
> - val = at91_adc_readl(st, chan->address);
> + val = at91_adc_read_chan(st, chan->address);
> at91_adc_adjust_val_osr(st, &val);
> st->buffer[i] = val;
> } else {
> @@ -1073,7 +1154,7 @@ static void at91_adc_trigger_handler_dma(struct iio_dev *indio_dev)
> s64 interval;
> int sample_index = 0, sample_count, sample_size;
>
> - u32 status = at91_adc_readl(st, AT91_SAMA5D2_ISR);
> + u32 status = at91_adc_readl(st, ISR);
> /* if we reached this point, we cannot sample faster */
> if (status & AT91_SAMA5D2_IER_GOVRE)
> pr_info_ratelimited("%s: conversion overrun detected\n",
> @@ -1125,7 +1206,7 @@ static irqreturn_t at91_adc_trigger_handler(int irq, void *p)
> * actually polling the trigger now.
> */
> if (iio_trigger_validate_own_device(indio_dev->trig, indio_dev))
> - at91_adc_writel(st, AT91_SAMA5D2_CR, AT91_SAMA5D2_CR_START);
> + at91_adc_writel(st, CR, AT91_SAMA5D2_CR_START);
>
> if (st->dma_st.dma_chan)
> at91_adc_trigger_handler_dma(indio_dev);
> @@ -1172,11 +1253,11 @@ static void at91_adc_setup_samp_freq(struct iio_dev *indio_dev, unsigned freq)
> startup = at91_adc_startup_time(st->soc_info.startup_time,
> freq / 1000);
>
> - mr = at91_adc_readl(st, AT91_SAMA5D2_MR);
> + mr = at91_adc_readl(st, MR);
> mr &= ~(AT91_SAMA5D2_MR_STARTUP_MASK | AT91_SAMA5D2_MR_PRESCAL_MASK);
> mr |= AT91_SAMA5D2_MR_STARTUP(startup);
> mr |= AT91_SAMA5D2_MR_PRESCAL(prescal);
> - at91_adc_writel(st, AT91_SAMA5D2_MR, mr);
> + at91_adc_writel(st, MR, mr);
>
> dev_dbg(&indio_dev->dev, "freq: %u, startup: %u, prescal: %u\n",
> freq, startup, prescal);
> @@ -1196,7 +1277,7 @@ static void at91_adc_touch_data_handler(struct iio_dev *indio_dev)
> int i = 0;
>
> for_each_set_bit(bit, indio_dev->active_scan_mask,
> - AT91_SAMA5D2_MAX_CHAN_IDX + 1) {
> + st->soc_info.platform->max_channels + 1) {
> struct iio_chan_spec const *chan =
> at91_adc_chan_get(indio_dev, bit);
>
> @@ -1222,12 +1303,11 @@ static void at91_adc_touch_data_handler(struct iio_dev *indio_dev)
>
> static void at91_adc_pen_detect_interrupt(struct at91_adc_state *st)
> {
> - at91_adc_writel(st, AT91_SAMA5D2_IDR, AT91_SAMA5D2_IER_PEN);
> - at91_adc_writel(st, AT91_SAMA5D2_IER, AT91_SAMA5D2_IER_NOPEN |
> + at91_adc_writel(st, IDR, AT91_SAMA5D2_IER_PEN);
> + at91_adc_writel(st, IER, AT91_SAMA5D2_IER_NOPEN |
> AT91_SAMA5D2_IER_XRDY | AT91_SAMA5D2_IER_YRDY |
> AT91_SAMA5D2_IER_PRDY);
> - at91_adc_writel(st, AT91_SAMA5D2_TRGR,
> - AT91_SAMA5D2_TRGR_TRGMOD_PERIODIC |
> + at91_adc_writel(st, TRGR, AT91_SAMA5D2_TRGR_TRGMOD_PERIODIC |
> AT91_SAMA5D2_TRGR_TRGPER(st->touch_st.sample_period_val));
> st->touch_st.touching = true;
> }
> @@ -1236,16 +1316,15 @@ static void at91_adc_no_pen_detect_interrupt(struct iio_dev *indio_dev)
> {
> struct at91_adc_state *st = iio_priv(indio_dev);
>
> - at91_adc_writel(st, AT91_SAMA5D2_TRGR,
> - AT91_SAMA5D2_TRGR_TRGMOD_NO_TRIGGER);
> - at91_adc_writel(st, AT91_SAMA5D2_IDR, AT91_SAMA5D2_IER_NOPEN |
> + at91_adc_writel(st, TRGR, AT91_SAMA5D2_TRGR_TRGMOD_NO_TRIGGER);
> + at91_adc_writel(st, IDR, AT91_SAMA5D2_IER_NOPEN |
> AT91_SAMA5D2_IER_XRDY | AT91_SAMA5D2_IER_YRDY |
> AT91_SAMA5D2_IER_PRDY);
> st->touch_st.touching = false;
>
> at91_adc_touch_data_handler(indio_dev);
>
> - at91_adc_writel(st, AT91_SAMA5D2_IER, AT91_SAMA5D2_IER_PEN);
> + at91_adc_writel(st, IER, AT91_SAMA5D2_IER_PEN);
> }
>
> static void at91_adc_workq_handler(struct work_struct *workq)
> @@ -1263,8 +1342,8 @@ static irqreturn_t at91_adc_interrupt(int irq, void *private)
> {
> struct iio_dev *indio = private;
> struct at91_adc_state *st = iio_priv(indio);
> - u32 status = at91_adc_readl(st, AT91_SAMA5D2_ISR);
> - u32 imr = at91_adc_readl(st, AT91_SAMA5D2_IMR);
> + u32 status = at91_adc_readl(st, ISR);
> + u32 imr = at91_adc_readl(st, IMR);
> u32 rdy_mask = AT91_SAMA5D2_IER_XRDY | AT91_SAMA5D2_IER_YRDY |
> AT91_SAMA5D2_IER_PRDY;
>
> @@ -1285,9 +1364,9 @@ static irqreturn_t at91_adc_interrupt(int irq, void *private)
> * touching, but the measurements are not ready yet.
> * read and ignore.
> */
> - status = at91_adc_readl(st, AT91_SAMA5D2_XPOSR);
> - status = at91_adc_readl(st, AT91_SAMA5D2_YPOSR);
> - status = at91_adc_readl(st, AT91_SAMA5D2_PRESSR);
> + status = at91_adc_readl(st, XPOSR);
> + status = at91_adc_readl(st, YPOSR);
> + status = at91_adc_readl(st, PRESSR);
> } else if (iio_buffer_enabled(indio) &&
> (status & AT91_SAMA5D2_IER_DRDY)) {
> /* triggered buffer without DMA */
> @@ -1299,7 +1378,7 @@ static irqreturn_t at91_adc_interrupt(int irq, void *private)
> WARN(true, "Unexpected irq occurred\n");
> } else if (!iio_buffer_enabled(indio)) {
> /* software requested conversion */
> - st->conversion_value = at91_adc_readl(st, st->chan->address);
> + st->conversion_value = at91_adc_read_chan(st, st->chan->address);
> st->conversion_done = true;
> wake_up_interruptible(&st->wq_data_available);
> }
> @@ -1360,10 +1439,10 @@ static int at91_adc_read_info_raw(struct iio_dev *indio_dev,
> cor = (BIT(chan->channel) | BIT(chan->channel2)) <<
> AT91_SAMA5D2_COR_DIFF_OFFSET;
>
> - at91_adc_writel(st, AT91_SAMA5D2_COR, cor);
> - at91_adc_writel(st, AT91_SAMA5D2_CHER, BIT(chan->channel));
> - at91_adc_writel(st, AT91_SAMA5D2_IER, BIT(chan->channel));
> - at91_adc_writel(st, AT91_SAMA5D2_CR, AT91_SAMA5D2_CR_START);
> + at91_adc_writel(st, COR, cor);
> + at91_adc_writel(st, CHER, BIT(chan->channel));
> + at91_adc_writel(st, IER, BIT(chan->channel));
> + at91_adc_writel(st, CR, AT91_SAMA5D2_CR_START);
>
> ret = wait_event_interruptible_timeout(st->wq_data_available,
> st->conversion_done,
> @@ -1379,11 +1458,11 @@ static int at91_adc_read_info_raw(struct iio_dev *indio_dev,
> st->conversion_done = false;
> }
>
> - at91_adc_writel(st, AT91_SAMA5D2_IDR, BIT(chan->channel));
> - at91_adc_writel(st, AT91_SAMA5D2_CHDR, BIT(chan->channel));
> + at91_adc_writel(st, IDR, BIT(chan->channel));
> + at91_adc_writel(st, CHDR, BIT(chan->channel));
>
> /* Needed to ACK the DRDY interruption */
> - at91_adc_readl(st, AT91_SAMA5D2_LCDR);
> + at91_adc_readl(st, LCDR);
>
> mutex_unlock(&st->lock);
>
> @@ -1455,14 +1534,15 @@ static void at91_adc_dma_init(struct platform_device *pdev)
> struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> struct at91_adc_state *st = iio_priv(indio_dev);
> struct dma_slave_config config = {0};
> + /* we have 2 bytes for each channel */
> + unsigned int sample_size = st->soc_info.platform->nr_channels * 2;
> /*
> * We make the buffer double the size of the fifo,
> * such that DMA uses one half of the buffer (full fifo size)
> * and the software uses the other half to read/write.
> */
> unsigned int pages = DIV_ROUND_UP(AT91_HWFIFO_MAX_SIZE *
> - AT91_BUFFER_MAX_CONVERSION_BYTES * 2,
> - PAGE_SIZE);
> + sample_size * 2, PAGE_SIZE);
>
> if (st->dma_st.dma_chan)
> return;
> @@ -1486,7 +1566,7 @@ static void at91_adc_dma_init(struct platform_device *pdev)
> /* Configure DMA channel to read data register */
> config.direction = DMA_DEV_TO_MEM;
> config.src_addr = (phys_addr_t)(st->dma_st.phys_addr
> - + AT91_SAMA5D2_LCDR);
> + + st->soc_info.platform->layout->LCDR);
> config.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
> config.src_maxburst = 1;
> config.dst_maxburst = 1;
> @@ -1515,9 +1595,10 @@ static void at91_adc_dma_disable(struct platform_device *pdev)
> {
> struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> struct at91_adc_state *st = iio_priv(indio_dev);
> + /* we have 2 bytes for each channel */
> + unsigned int sample_size = st->soc_info.platform->nr_channels * 2;
> unsigned int pages = DIV_ROUND_UP(AT91_HWFIFO_MAX_SIZE *
> - AT91_BUFFER_MAX_CONVERSION_BYTES * 2,
> - PAGE_SIZE);
> + sample_size * 2, PAGE_SIZE);
>
> /* if we are not using DMA, just return */
> if (!st->dma_st.dma_chan)
> @@ -1578,14 +1659,14 @@ static int at91_adc_update_scan_mode(struct iio_dev *indio_dev,
> struct at91_adc_state *st = iio_priv(indio_dev);
>
> if (bitmap_subset(scan_mask, &st->touch_st.channels_bitmask,
> - AT91_SAMA5D2_MAX_CHAN_IDX + 1))
> + st->soc_info.platform->max_channels + 1))
> return 0;
> /*
> * if the new bitmap is a combination of touchscreen and regular
> * channels, then we are not fine
> */
> if (bitmap_intersects(&st->touch_st.channels_bitmask, scan_mask,
> - AT91_SAMA5D2_MAX_CHAN_IDX + 1))
> + st->soc_info.platform->max_channels + 1))
> return -EINVAL;
> return 0;
> }
> @@ -1594,13 +1675,13 @@ static void at91_adc_hw_init(struct iio_dev *indio_dev)
> {
> struct at91_adc_state *st = iio_priv(indio_dev);
>
> - at91_adc_writel(st, AT91_SAMA5D2_CR, AT91_SAMA5D2_CR_SWRST);
> - at91_adc_writel(st, AT91_SAMA5D2_IDR, 0xffffffff);
> + at91_adc_writel(st, CR, AT91_SAMA5D2_CR_SWRST);
> + at91_adc_writel(st, IDR, 0xffffffff);
> /*
> * Transfer field must be set to 2 according to the datasheet and
> * allows different analog settings for each channel.
> */
> - at91_adc_writel(st, AT91_SAMA5D2_MR,
> + at91_adc_writel(st, MR,
> AT91_SAMA5D2_MR_TRANSFER(2) | AT91_SAMA5D2_MR_ANACH);
>
> at91_adc_setup_samp_freq(indio_dev, st->soc_info.min_sample_rate);
> @@ -1716,21 +1797,23 @@ static int at91_adc_probe(struct platform_device *pdev)
> if (!indio_dev)
> return -ENOMEM;
>
> + st = iio_priv(indio_dev);
> + st->indio_dev = indio_dev;
> +
> + st->soc_info.platform = of_device_get_match_data(&pdev->dev);
> +
> indio_dev->name = dev_name(&pdev->dev);
> indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
> indio_dev->info = &at91_adc_info;
> - indio_dev->channels = at91_adc_channels;
> - indio_dev->num_channels = ARRAY_SIZE(at91_adc_channels);
> -
> - st = iio_priv(indio_dev);
> - st->indio_dev = indio_dev;
> + indio_dev->channels = *st->soc_info.platform->adc_channels;
> + indio_dev->num_channels = st->soc_info.platform->max_channels;
>
> bitmap_set(&st->touch_st.channels_bitmask,
> - AT91_SAMA5D2_TOUCH_X_CHAN_IDX, 1);
> + st->soc_info.platform->touch_chan_x, 1);
> bitmap_set(&st->touch_st.channels_bitmask,
> - AT91_SAMA5D2_TOUCH_Y_CHAN_IDX, 1);
> + st->soc_info.platform->touch_chan_y, 1);
> bitmap_set(&st->touch_st.channels_bitmask,
> - AT91_SAMA5D2_TOUCH_P_CHAN_IDX, 1);
> + st->soc_info.platform->touch_chan_p, 1);
>
> st->oversampling_ratio = AT91_OSR_1SAMPLES;
>
> @@ -1770,7 +1853,7 @@ static int at91_adc_probe(struct platform_device *pdev)
> st->selected_trig = NULL;
>
> /* find the right trigger, or no trigger at all */
> - for (i = 0; i < AT91_SAMA5D2_HW_TRIG_CNT + 1; i++)
> + for (i = 0; i < st->soc_info.platform->hw_trig_cnt + 1; i++)
> if (at91_adc_trigger_list[i].edge_type == edge_type) {
> st->selected_trig = &at91_adc_trigger_list[i];
> break;
> @@ -1855,7 +1938,7 @@ static int at91_adc_probe(struct platform_device *pdev)
> st->selected_trig->name);
>
> dev_info(&pdev->dev, "version: %x\n",
> - readl_relaxed(st->base + AT91_SAMA5D2_VERSION));
> + readl_relaxed(st->base + st->soc_info.platform->layout->VERSION));
>
> return 0;
>
> @@ -1898,7 +1981,7 @@ static __maybe_unused int at91_adc_suspend(struct device *dev)
> * and can be used by for other devices.
> * Otherwise, ADC will hog them and we can't go to suspend mode.
> */
> - at91_adc_writel(st, AT91_SAMA5D2_CR, AT91_SAMA5D2_CR_SWRST);
> + at91_adc_writel(st, CR, AT91_SAMA5D2_CR_SWRST);
>
> clk_disable_unprepare(st->per_clk);
> regulator_disable(st->vref);
> @@ -1958,6 +2041,7 @@ static SIMPLE_DEV_PM_OPS(at91_adc_pm_ops, at91_adc_suspend, at91_adc_resume);
> static const struct of_device_id at91_adc_dt_match[] = {
> {
> .compatible = "atmel,sama5d2-adc",
> + .data = (const void *)&sama5d2_platform,
> }, {
> /* sentinel */
> }