ARM: AT91: ADC: Add support for the AT91SAM9M10G45-EK board

This patch adds platform data for the AT91 ADC driver support for
the AT91SAM9M10G45-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>

3 files changed, 122 insertions, 0 deletions

diff --git a/arch/arm/mach-at91/at91sam9g45.c b/arch/arm/mach-at91/at91sam9g45.c
index d222f8333dab..30865c6b9936 100644
--- a/arch/arm/mach-at91/at91sam9g45.c
+++ b/arch/arm/mach-at91/at91sam9g45.c
@@ -176,6 +176,12 @@ static struct clk vdec_clk = {
         .type           = CLK_TYPE_PERIPHERAL,
 };
 
+static struct clk adc_op_clk = {
+        .name           = "adc_op_clk",
+        .type           = CLK_TYPE_PERIPHERAL,
+        .rate_hz        = 13200000,
+};
+
 static struct clk *periph_clocks[] __initdata = {
         &pioA_clk,
         &pioB_clk,
@@ -204,6 +210,7 @@ static struct clk *periph_clocks[] __initdata = {
         &isi_clk,
         &udphs_clk,
         &mmc1_clk,
+        &adc_op_clk,
         // irq0
 };
 
@@ -242,6 +249,8 @@ static struct clk_lookup periph_clocks_lookups[] = {
         CLKDEV_CON_ID("pioC", &pioC_clk),
         CLKDEV_CON_ID("pioD", &pioDE_clk),
         CLKDEV_CON_ID("pioE", &pioDE_clk),
+        /* Fake adc clock */
+        CLKDEV_CON_ID("adc_clk", &tsc_clk),
 };
 
 static struct clk_lookup usart_clocks_lookups[] = {
diff --git a/arch/arm/mach-at91/at91sam9g45_devices.c b/arch/arm/mach-at91/at91sam9g45_devices.c
index 6b008aee1dff..0c6d9fe41eec 100644
--- a/arch/arm/mach-at91/at91sam9g45_devices.c
+++ b/arch/arm/mach-at91/at91sam9g45_devices.c
@@ -19,9 +19,12 @@
 #include <linux/i2c-gpio.h>
 #include <linux/atmel-mci.h>
 
+#include <linux/platform_data/at91_adc.h>
+
 #include <linux/fb.h>
 #include <video/atmel_lcdc.h>
 
+#include <mach/at91_adc.h>
 #include <mach/board.h>
 #include <mach/at91sam9g45.h>
 #include <mach/at91sam9g45_matrix.h>
@@ -1207,6 +1210,104 @@ void __init at91_add_device_tsadcc(struct at91_tsadcc_data *data) {}
 
 
 /* --------------------------------------------------------------------
+ *  ADC
+ * -------------------------------------------------------------------- */
+
+#if IS_ENABLED(CONFIG_AT91_ADC)
+static struct at91_adc_data adc_data;
+
+static struct resource adc_resources[] = {
+        [0] = {
+                .start  = AT91SAM9G45_BASE_TSC,
+                .end    = AT91SAM9G45_BASE_TSC + SZ_16K - 1,
+                .flags  = IORESOURCE_MEM,
+        },
+        [1] = {
+                .start  = AT91SAM9G45_ID_TSC,
+                .end    = AT91SAM9G45_ID_TSC,
+                .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 = "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,
+        },
+};
+
+static struct at91_adc_reg_desc at91_adc_register_g45 = {
+        .channel_base = AT91_ADC_CHR(0),
+        .drdy_mask = AT91_ADC_DRDY,
+        .status_register = AT91_ADC_SR,
+        .trigger_register = 0x08,
+};
+
+void __init at91_add_device_adc(struct at91_adc_data *data)
+{
+        if (!data)
+                return;
+
+        if (test_bit(0, &data->channels_used))
+                at91_set_gpio_input(AT91_PIN_PD20, 0);
+        if (test_bit(1, &data->channels_used))
+                at91_set_gpio_input(AT91_PIN_PD21, 0);
+        if (test_bit(2, &data->channels_used))
+                at91_set_gpio_input(AT91_PIN_PD22, 0);
+        if (test_bit(3, &data->channels_used))
+                at91_set_gpio_input(AT91_PIN_PD23, 0);
+        if (test_bit(4, &data->channels_used))
+                at91_set_gpio_input(AT91_PIN_PD24, 0);
+        if (test_bit(5, &data->channels_used))
+                at91_set_gpio_input(AT91_PIN_PD25, 0);
+        if (test_bit(6, &data->channels_used))
+                at91_set_gpio_input(AT91_PIN_PD26, 0);
+        if (test_bit(7, &data->channels_used))
+                at91_set_gpio_input(AT91_PIN_PD27, 0);
+
+        if (data->use_external_triggers)
+                at91_set_A_periph(AT91_PIN_PD28, 0);
+
+        data->num_channels = 8;
+        data->startup_time = 40;
+        data->registers = &at91_adc_register_g45;
+        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
+
+/* --------------------------------------------------------------------
  *  RTT
  * -------------------------------------------------------------------- */
 
diff --git a/arch/arm/mach-at91/board-sam9m10g45ek.c b/arch/arm/mach-at91/board-sam9m10g45ek.c
index c88e908ddd82..337abd2f0c1a 100644
--- a/arch/arm/mach-at91/board-sam9m10g45ek.c
+++ b/arch/arm/mach-at91/board-sam9m10g45ek.c
@@ -27,6 +27,8 @@
 #include <linux/atmel-mci.h>
 #include <linux/delay.h>
 
+#include <linux/platform_data/at91_adc.h>
+
 #include <mach/hardware.h>
 #include <video/atmel_lcdc.h>
 #include <media/soc_camera.h>
@@ -315,6 +317,14 @@ static struct at91_tsadcc_data ek_tsadcc_data = {
         .ts_sample_hold_time    = 0x0a,
 };
 
+/*
+ * ADCs
+ */
+static struct at91_adc_data ek_adc_data = {
+        .channels_used = BIT(0) | BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5) | BIT(6) | BIT(7),
+        .use_external_triggers = true,
+        .vref = 3300,
+};
 
 /*
  * GPIO Buttons
@@ -480,6 +490,8 @@ static void __init ek_board_init(void)
         at91_add_device_lcdc(&ek_lcdc_data);
         /* Touch Screen */
         at91_add_device_tsadcc(&ek_tsadcc_data);
+        /* ADC */
+        at91_add_device_adc(&ek_adc_data);
         /* Push Buttons */
         ek_add_device_buttons();
         /* AC97 */