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author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2012-05-11 15:35:34 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-05-14 13:25:33 -0700 |
commit | 67b5d7b3e2ce01c091c8adb120b9fffcb2dddc0a (patch) | |
tree | e2c6026fc0bb6f74454373849725978a38d9f829 /arch/arm/mach-at91/at91sam9260_devices.c | |
parent | 0e589d5fb3172b0dde7fdad3a4829ce5352dd30d (diff) | |
download | blackbird-op-linux-67b5d7b3e2ce01c091c8adb120b9fffcb2dddc0a.tar.gz blackbird-op-linux-67b5d7b3e2ce01c091c8adb120b9fffcb2dddc0a.zip |
ARM: AT91: Add the ADC to the sam9g20ek board
This patch adds platform data for the AT91 ADC driver support for
the AT91SAM9G20-EK board.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm/mach-at91/at91sam9260_devices.c')
-rw-r--r-- | arch/arm/mach-at91/at91sam9260_devices.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c index 5652dde4bbe2..be0eb2642439 100644 --- a/arch/arm/mach-at91/at91sam9260_devices.c +++ b/arch/arm/mach-at91/at91sam9260_devices.c @@ -17,12 +17,15 @@ #include <linux/platform_device.h> #include <linux/i2c-gpio.h> +#include <linux/platform_data/at91_adc.h> + #include <mach/board.h> #include <mach/cpu.h> #include <mach/at91sam9260.h> #include <mach/at91sam9260_matrix.h> #include <mach/at91_matrix.h> #include <mach/at91sam9_smc.h> +#include <mach/at91_adc.h> #include "generic.h" @@ -1369,6 +1372,93 @@ void __init at91_add_device_cf(struct at91_cf_data *data) void __init at91_add_device_cf(struct at91_cf_data * data) {} #endif +/* -------------------------------------------------------------------- + * ADCs + * -------------------------------------------------------------------- */ + +#if IS_ENABLED(CONFIG_AT91_ADC) +static struct at91_adc_data adc_data; + +static struct resource adc_resources[] = { + [0] = { + .start = AT91SAM9260_BASE_ADC, + .end = AT91SAM9260_BASE_ADC + SZ_16K - 1, + .flags = IORESOURCE_MEM, + }, + [1] = { + .start = AT91SAM9260_ID_ADC, + .end = AT91SAM9260_ID_ADC, + .flags = IORESOURCE_IRQ, + }, +}; + +static struct platform_device at91_adc_device = { + .name = "at91_adc", + .id = -1, + .dev = { + .platform_data = &adc_data, + }, + .resource = adc_resources, + .num_resources = ARRAY_SIZE(adc_resources), +}; + +static struct at91_adc_trigger at91_adc_triggers[] = { + [0] = { + .name = "timer-counter-0", + .value = AT91_ADC_TRGSEL_TC0 | AT91_ADC_TRGEN, + }, + [1] = { + .name = "timer-counter-1", + .value = AT91_ADC_TRGSEL_TC1 | AT91_ADC_TRGEN, + }, + [2] = { + .name = "timer-counter-2", + .value = AT91_ADC_TRGSEL_TC2 | AT91_ADC_TRGEN, + }, + [3] = { + .name = "external", + .value = AT91_ADC_TRGSEL_EXTERNAL | AT91_ADC_TRGEN, + .is_external = true, + }, +}; + +static struct at91_adc_reg_desc at91_adc_register_g20 = { + .channel_base = AT91_ADC_CHR(0), + .drdy_mask = AT91_ADC_DRDY, + .status_register = AT91_ADC_SR, + .trigger_register = AT91_ADC_MR, +}; + +void __init at91_add_device_adc(struct at91_adc_data *data) +{ + if (!data) + return; + + if (test_bit(0, &data->channels_used)) + at91_set_A_periph(AT91_PIN_PC0, 0); + if (test_bit(1, &data->channels_used)) + at91_set_A_periph(AT91_PIN_PC1, 0); + if (test_bit(2, &data->channels_used)) + at91_set_A_periph(AT91_PIN_PC2, 0); + if (test_bit(3, &data->channels_used)) + at91_set_A_periph(AT91_PIN_PC3, 0); + + if (data->use_external_triggers) + at91_set_A_periph(AT91_PIN_PA22, 0); + + data->num_channels = 4; + data->startup_time = 10; + data->registers = &at91_adc_register_g20; + data->trigger_number = 4; + data->trigger_list = at91_adc_triggers; + + adc_data = *data; + platform_device_register(&at91_adc_device); +} +#else +void __init at91_add_device_adc(struct at91_adc_data *data) {} +#endif + /* -------------------------------------------------------------------- */ /* * These devices are always present and don't need any board-specific |