boards: arm: mps2: Add pinmuxing

This patch adds pinmuxing configuration the ARM MPS2 AN385 board.

Change-Id: If9825e325e8f3abf568537f3a279b5f0f56bd088
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@linaro.org>

4 files changed, 181 insertions, 3 deletions

diff --git a/boards/arm/mps2_an385/Kconfig.defconfig b/boards/arm/mps2_an385/Kconfig.defconfig
index 7fbd566bd..1ada42a13 100644
--- a/boards/arm/mps2_an385/Kconfig.defconfig
+++ b/boards/arm/mps2_an385/Kconfig.defconfig
@@ -28,6 +28,13 @@ config GPIO_CMSDK_AHB_PORT3
 
 endif # GPIO
 
+if PINMUX
+
+config PINMUX_MPS2
+	def_bool y
+
+endif # PINMUX
+
 if SERIAL
 
 config UART_CMSDK_APB
diff --git a/boards/arm/mps2_an385/Makefile b/boards/arm/mps2_an385/Makefile
index 87680c01d..d1cf2effb 100644
--- a/boards/arm/mps2_an385/Makefile
+++ b/boards/arm/mps2_an385/Makefile
@@ -4,6 +4,6 @@
 # SPDX-License-Identifier: Apache-2.0
 #
 
-# Force build system to create built-in.o even though we do not (yet)
-# have any C files to compile
-obj- += dummy.o
+ccflags-y +=-I$(srctree)/drivers
+
+obj-$(CONFIG_PINMUX_MPS2) += pinmux.o
diff --git a/boards/arm/mps2_an385/mps2_an385_defconfig b/boards/arm/mps2_an385/mps2_an385_defconfig
index 458b60171..2a1485df4 100644
--- a/boards/arm/mps2_an385/mps2_an385_defconfig
+++ b/boards/arm/mps2_an385/mps2_an385_defconfig
@@ -15,6 +15,9 @@ CONFIG_RUNTIME_NMI=y
 # GPIOs
 CONFIG_GPIO=y
 
+# PinMuxing
+CONFIG_PINMUX=y
+
 # Serial
 CONFIG_CONSOLE=y
 CONFIG_UART_CONSOLE=y
diff --git a/boards/arm/mps2_an385/pinmux.c b/boards/arm/mps2_an385/pinmux.c
new file mode 100644
index 000000000..6cad9531a
--- /dev/null
+++ b/boards/arm/mps2_an385/pinmux.c
@@ -0,0 +1,168 @@
+/*
+ * Copyright (c) 2016 Linaro Limited
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <device.h>
+#include <init.h>
+#include <kernel.h>
+#include <pinmux.h>
+#include <soc.h>
+#include <sys_io.h>
+#include <gpio/gpio_cmsdk_ahb.h>
+
+#include "pinmux/pinmux.h"
+
+/**
+ * @brief Pinmux driver for ARM MPS2 AN385 Board
+ *
+ * The ARM MPS2 AN385 Board has 4 GPIO controllers. These controllers
+ * are responsible for pin muxing, input/output, pull-up, etc.
+ *
+ * All GPIO controller pins are exposed via the following sequence of pin
+ * numbers:
+ *   Pins  0 -  15 are for GPIO0
+ *   Pins 16 -  31 are for GPIO1
+ *   Pins 32 -  47 are for GPIO2
+ *   Pins 48 -  51 are for GPIO3
+ *
+ * For the GPIO controllers configuration ARM MPS2 AN385 Board follows the
+ * Arduino compliant pin out.
+ */
+
+#define CMSDK_AHB_GPIO0_DEV \
+	((volatile struct gpio_cmsdk_ahb *)CMSDK_AHB_GPIO0)
+#define CMSDK_AHB_GPIO1_DEV \
+	((volatile struct gpio_cmsdk_ahb *)CMSDK_AHB_GPIO1)
+#define CMSDK_AHB_GPIO2_DEV \
+	((volatile struct gpio_cmsdk_ahb *)CMSDK_AHB_GPIO2)
+#define CMSDK_AHB_GPIO3_DEV \
+	((volatile struct gpio_cmsdk_ahb *)CMSDK_AHB_GPIO3)
+
+/*
+ * This is the mapping from the ARM MPS2 AN385 Board pins to GPIO
+ * controllers.
+ *
+ * D0 : EXT_0
+ * D1 : EXT_4
+ * D2 : EXT_2
+ * D3 : EXT_3
+ * D4 : EXT_1
+ * D5 : EXT_6
+ * D6 : EXT_7
+ * D7 : EXT_8
+ * D8 : EXT_9
+ * D9 : EXT_10
+ * D10 : EXT_12
+ * D11 : EXT_13
+ * D12 : EXT_14
+ * D13 : EXT_11
+ * D14 : EXT_15
+ * D15 : EXT_5
+ * D16 : EXT_16
+ * D17 : EXT_17
+ * D18 : EXT_18
+ * D19 : EXT_19
+ * D20 : EXT_20
+ * D21 : EXT_21
+ * D22 : EXT_22
+ * D23 : EXT_23
+ * D24 : EXT_24
+ * D25 : EXT_25
+ * D26 : EXT_26
+ * D27 : EXT_30
+ * D28 : EXT_28
+ * D29 : EXT_29
+ * D30 : EXT_27
+ * D31 : EXT_32
+ * D32 : EXT_33
+ * D33 : EXT_34
+ * D34 : EXT_35
+ * D35 : EXT_36
+ * D36 : EXT_38
+ * D37 : EXT_39
+ * D38 : EXT_40
+ * D39 : EXT_44
+ * D40 : EXT_41
+ * D41 : EXT_31
+ * D42 : EXT_37
+ * D43 : EXT_42
+ * D44 : EXT_43
+ * D45 : EXT_45
+ * D46 : EXT_46
+ * D47 : EXT_47
+ * D48 : EXT_48
+ * D49 : EXT_49
+ * D50 : EXT_50
+ * D51 : EXT_51
+ *
+ * UART_3_RX : D0
+ * UART_3_TX : D1
+ * SPI_3_CS : D10
+ * SPI_3_MOSI : D11
+ * SPI_3_MISO : D12
+ * SPI_3_SCLK : D13
+ * I2C_3_SDA : D14
+ * I2C_3_SCL : D15
+ * UART_4_RX : D26
+ * UART_4_TX : D30
+ * SPI_4_CS : D36
+ * SPI_4_MOSI : D37
+ * SPI_4_MISO : D38
+ * SPI_4_SCK : D39
+ * I2C_4_SDA : D40
+ * I2C_4_SCL : D41
+ *
+ */
+static void arm_mps2_pinmux_defaults(void)
+{
+	uint32_t gpio_0 = 0;
+	uint32_t gpio_1 = 0;
+	uint32_t gpio_2 = 0;
+
+	/* Set GPIO Alternate Functions */
+
+	gpio_0 = (1<<0)   /* Shield 0 UART 3 RXD */
+	       | (1<<4)   /* Shield 0 UART 3 TXD */
+	       | (1<<5)   /* Shield 0 I2C 3 SDL SBCON2 */
+	       | (1<<15)  /* Shield 0 I2C 3 SDA SBCON2 */
+	       | (1<<11)  /* Shield 0 SPI 3 nCS */
+	       | (1<<12)  /* Shield 0 SPI 3 MOSI */
+	       | (1<<13)  /* Shield 0 SPI 3 MISO */
+	       | (1<<14); /* Shield 0 SPI 3 SCK */
+
+	CMSDK_AHB_GPIO0_DEV->altfuncset = gpio_0;
+
+	gpio_1 = (1<<10) /* Shield 1 UART 4 RXD */
+	       | (1<<14) /* Shield 1 UART 4 TXD */
+	       | (1<<15) /* Shield 1 I2C 4 SCL */
+	       | (1<<0)  /* ADC SPI_1 nCS */
+	       | (1<<1)  /* ADC SPI_1 MOSI */
+	       | (1<<2)  /* ADC SPI_1 MISO */
+	       | (1<<3)  /* ADC SPI_1 SCK */
+	       | (1<<5)  /* USER BUTTON 0 */
+	       | (1<<6); /* USER BUTTON 1 */
+
+	CMSDK_AHB_GPIO1_DEV->altfuncset = gpio_1;
+
+	gpio_2 = (1<<9)   /* Shield 1 I2C 4 SDA */
+	       | (1<<6)   /* Shield 1 I2C 4 SDA */
+	       | (1<<7)   /* Shield 1 I2C 4 SDA */
+	       | (1<<8)   /* Shield 1 I2C 4 SDA */
+	       | (1<<12); /* Shield 1 I2C 4 SDA */
+
+	CMSDK_AHB_GPIO2_DEV->altfuncset = gpio_2;
+}
+
+static int arm_mps2_pinmux_init(struct device *port)
+{
+	ARG_UNUSED(port);
+
+	arm_mps2_pinmux_defaults();
+
+	return 0;
+}
+
+SYS_INIT(arm_mps2_pinmux_init, PRE_KERNEL_1,
+	 CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);