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

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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: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
This commit is contained in:
Alexandre Belloni 2014-04-15 12:28:03 +02:00 committed by Nicolas Ferre
parent 65b1fdbac9
commit b8ba9a40a7
2 changed files with 92 additions and 0 deletions
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7
arch/arm/mach-at91/at91sam9rl.c
View File

@ -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[] = {

85
arch/arm/mach-at91/at91sam9rl_devices.c
View File

@ -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