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Commit b8ba9a40 authored by Alexandre Belloni's avatar Alexandre Belloni Committed by Nicolas Ferre
Browse files

ARM: at91: sam9rl: add at91_adc to support adc and touchscreen 



The ADC clock needs to be defined to enable the at91_adc driver. It is defined
to the same speed that is used for atmel_tsadcc.

Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
parent 65b1fdba

arch/arm/mach-at91/at91sam9rl.c

+7 −0
Original line number Diff line number Diff line
@@ -153,6 +153,11 @@ static struct clk ac97_clk = { 
	.pmc_mask	= 1 << AT91SAM9RL_ID_AC97C,

	.type		= CLK_TYPE_PERIPHERAL,

};

static struct clk adc_op_clk = {

	.name		= "adc_op_clk",

	.type		= CLK_TYPE_PERIPHERAL,

	.rate_hz	= 1000000,

};



static struct clk *periph_clocks[] __initdata = {

	&pioA_clk,
@@ -178,6 +183,7 @@ static struct clk *periph_clocks[] __initdata = { 
	&udphs_clk,

	&lcdc_clk,

	&ac97_clk,

	&adc_op_clk,

	// irq0

};
@@ -216,6 +222,7 @@ static struct clk_lookup periph_clocks_lookups[] = { 
	CLKDEV_CON_DEV_ID(NULL, "fffff600.gpio", &pioB_clk),

	CLKDEV_CON_DEV_ID(NULL, "fffff800.gpio", &pioC_clk),

	CLKDEV_CON_DEV_ID(NULL, "fffffa00.gpio", &pioD_clk),

	CLKDEV_CON_ID("adc_clk", &tsc_clk),

};



static struct clk_lookup usart_clocks_lookups[] = {

arch/arm/mach-at91/at91sam9rl_devices.c

+85 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <mach/at91sam9_smc.h>

#include <mach/hardware.h>

#include <linux/platform_data/dma-atmel.h>

#include <linux/platform_data/at91_adc.h>



#include "board.h"

#include "generic.h"
@@ -658,6 +659,90 @@ void __init at91_add_device_tsadcc(struct at91_tsadcc_data *data) 
void __init at91_add_device_tsadcc(struct at91_tsadcc_data *data) {}

#endif



/* --------------------------------------------------------------------

 *  ADC and Touchscreen

 * -------------------------------------------------------------------- */



#if IS_ENABLED(CONFIG_AT91_ADC)

static struct at91_adc_data adc_data;



static struct resource adc_resources[] = {

	[0] = {

		.start	= AT91SAM9RL_BASE_TSC,

		.end	= AT91SAM9RL_BASE_TSC + SZ_16K - 1,

		.flags	= IORESOURCE_MEM,

	},

	[1] = {

		.start	= NR_IRQS_LEGACY + AT91SAM9RL_ID_TSC,

		.end	= NR_IRQS_LEGACY + AT91SAM9RL_ID_TSC,

		.flags	= IORESOURCE_IRQ,

	}

};



static struct platform_device at91_adc_device = {

	.name           = "at91sam9rl-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 = "external-rising",

		.value = 1,

		.is_external = true,

	},

	[1] = {

		.name = "external-falling",

		.value = 2,

		.is_external = true,

	},

	[2] = {

		.name = "external-any",

		.value = 3,

		.is_external = true,

	},

	[3] = {

		.name = "continuous",

		.value = 6,

		.is_external = false,

	},

};



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_PA17, 0);

	if (test_bit(1, &data->channels_used))

		at91_set_A_periph(AT91_PIN_PA18, 0);

	if (test_bit(2, &data->channels_used))

		at91_set_A_periph(AT91_PIN_PA19, 0);

	if (test_bit(3, &data->channels_used))

		at91_set_A_periph(AT91_PIN_PA20, 0);

	if (test_bit(4, &data->channels_used))

		at91_set_A_periph(AT91_PIN_PD6, 0);

	if (test_bit(5, &data->channels_used))

		at91_set_A_periph(AT91_PIN_PD7, 0);



	if (data->use_external_triggers)

		at91_set_A_periph(AT91_PIN_PB15, 0);



	data->startup_time = 40;

	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



/* --------------------------------------------------------------------

 *  RTC