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ARM: AT91: Add the ADC to the sam9g20ek board

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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>
This commit is contained in:
Maxime Ripard 2012-05-11 15:35:34 +02:00 committed by Greg Kroah-Hartman
parent 0e589d5fb3
commit 67b5d7b3e2
3 changed files with 112 additions and 0 deletions
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8
arch/arm/mach-at91/at91sam9260.c
View File

@ -55,6 +55,13 @@ static struct clk adc_clk = {
.pmc_mask = 1 << AT91SAM9260_ID_ADC,
.type = CLK_TYPE_PERIPHERAL,
};
static struct clk adc_op_clk = {
.name = "adc_op_clk",
.type = CLK_TYPE_PERIPHERAL,
.rate_hz = 5000000,
};
static struct clk usart0_clk = {
.name = "usart0_clk",
.pmc_mask = 1 << AT91SAM9260_ID_US0,
@ -166,6 +173,7 @@ static struct clk *periph_clocks[] __initdata = {
&pioB_clk,
&pioC_clk,
&adc_clk,
&adc_op_clk,
&usart0_clk,
&usart1_clk,
&usart2_clk,

90
arch/arm/mach-at91/at91sam9260_devices.c
View File

@ -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

14
arch/arm/mach-at91/board-sam9g20ek.c
View File

@ -32,6 +32,8 @@
#include <linux/regulator/fixed.h>
#include <linux/regulator/consumer.h>
#include <linux/platform_data/at91_adc.h>
#include <mach/hardware.h>
#include <asm/setup.h>
#include <asm/mach-types.h>
@ -318,6 +320,16 @@ static void __init ek_add_device_buttons(void)
static void __init ek_add_device_buttons(void) {}
#endif
/*
* ADCs
*/
static struct at91_adc_data ek_adc_data = {
.channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3),
.use_external_triggers = true,
.vref = 3300,
};
#if defined(CONFIG_REGULATOR_FIXED_VOLTAGE) || defined(CONFIG_REGULATOR_FIXED_VOLTAGE_MODULE)
static struct regulator_consumer_supply ek_audio_consumer_supplies[] = {
REGULATOR_SUPPLY("AVDD", "0-001b"),
@ -393,6 +405,8 @@ static void __init ek_board_init(void)
ek_add_device_gpio_leds();
/* Push Buttons */
ek_add_device_buttons();
/* ADCs */
at91_add_device_adc(&ek_adc_data);
/* PCK0 provides MCLK to the WM8731 */
at91_set_B_periph(AT91_PIN_PC1, 0);
/* SSC (for WM8731) */