Add Merisc board support

Merisc is the family name for a range of AVR32-based boards.

The boards are designed to be used in a man-machine interfacing
environment, utilizing a touch-based graphical user interface. They host
a vast range of I/O peripherals as well as a large SDRAM & Flash memory
bank.

For more information see: http://www.martinsson.se/merisc

Signed-off-by: Jonas Larsson <jonas.larsson@martinsson.se>
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

7 files changed, 582 insertions, 0 deletions

diff --git a/arch/avr32/boards/merisc/Kconfig b/arch/avr32/boards/merisc/Kconfig
new file mode 100644
index 0000000..7e04327
--- /dev/null
+++ b/arch/avr32/boards/merisc/Kconfig
@@ -0,0 +1,5 @@
+# Merisc customization
+
+if BOARD_MERISC
+
+endif	# BOARD_MERISC
diff --git a/arch/avr32/boards/merisc/Makefile b/arch/avr32/boards/merisc/Makefile
new file mode 100644
index 0000000..d24c787
--- /dev/null
+++ b/arch/avr32/boards/merisc/Makefile
@@ -0,0 +1 @@
+obj-y					+= setup.o flash.o display.o merisc_sysfs.o
diff --git a/arch/avr32/boards/merisc/display.c b/arch/avr32/boards/merisc/display.c
new file mode 100644
index 0000000..85a543c
--- /dev/null
+++ b/arch/avr32/boards/merisc/display.c
@@ -0,0 +1,65 @@
+/*
+ * Display setup code for the Merisc board
+ *
+ * Copyright (C) 2008 Martinsson Elektronik AB
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/fb.h>
+#include <video/atmel_lcdc.h>
+#include <asm/setup.h>
+#include <mach/board.h>
+#include "merisc.h"
+
+static struct fb_videomode merisc_fb_videomode[] = {
+	{
+		.refresh	= 44,
+		.xres		= 640,
+		.yres		= 480,
+		.left_margin	= 96,
+		.right_margin	= 96,
+		.upper_margin	= 34,
+		.lower_margin	= 8,
+		.hsync_len	= 64,
+		.vsync_len	= 64,
+		.name		= "640x480 @ 44",
+		.pixclock	= KHZ2PICOS(25180),
+		.sync		= 0,
+		.vmode		= FB_VMODE_NONINTERLACED,
+	},
+};
+
+static struct fb_monspecs merisc_fb_monspecs = {
+	.manufacturer	= "Kyo",
+	.monitor	= "TCG075VG2AD",
+	.modedb		= merisc_fb_videomode,
+	.modedb_len	= ARRAY_SIZE(merisc_fb_videomode),
+	.hfmin		= 30000,
+	.hfmax		= 33333,
+	.vfmin		= 60,
+	.vfmax		= 90,
+	.dclkmax	= 30000000,
+};
+
+struct atmel_lcdfb_info merisc_lcdc_data = {
+	.default_bpp		= 24,
+	.default_dmacon		= ATMEL_LCDC_DMAEN | ATMEL_LCDC_DMA2DEN,
+	.default_lcdcon2	= (ATMEL_LCDC_DISTYPE_TFT
+				   | ATMEL_LCDC_CLKMOD_ALWAYSACTIVE
+				   | ATMEL_LCDC_MEMOR_BIG),
+	.default_monspecs	= &merisc_fb_monspecs,
+	.guard_time		= 2,
+};
+
+static int __init merisc_display_init(void)
+{
+	at32_add_device_lcdc(0, &merisc_lcdc_data, fbmem_start,
+			     fbmem_size, 0);
+
+	return 0;
+}
+device_initcall(merisc_display_init);
diff --git a/arch/avr32/boards/merisc/flash.c b/arch/avr32/boards/merisc/flash.c
new file mode 100644
index 0000000..8e856fd
--- /dev/null
+++ b/arch/avr32/boards/merisc/flash.c
@@ -0,0 +1,139 @@
+/*
+ * Merisc board-specific flash initialization
+ *
+ * Copyright (C) 2008 Martinsson Elektronik AB
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/physmap.h>
+#include <mach/smc.h>
+
+/* Will be translated to units of 14.3 ns, rounded up */
+static struct smc_timing flash_timing __initdata = {
+	.ncs_read_setup		= 1 * 14,
+	.nrd_setup		= 5 * 14,
+	.ncs_write_setup	= 1 * 14,
+	.nwe_setup		= 2 * 14,
+
+	.ncs_read_pulse		= 12 * 14,
+	.nrd_pulse		= 7 * 14,
+	.ncs_write_pulse	= 8 * 14,
+	.nwe_pulse		= 4 * 14,
+
+	.read_cycle		= 14 * 14,
+	.write_cycle		= 10 * 14,
+};
+
+static struct smc_config flash_config __initdata = {
+	.bus_width	= 2,
+	.nrd_controlled	= 1,
+	.nwe_controlled	= 1,
+	.byte_write	= 1,
+	.tdf_cycles	= 3,
+};
+
+static struct mtd_partition flash_0_parts[] = {
+	{
+		.name		= "boot",
+		.offset		= 0x00000000,
+		.size		= 0x00060000,
+		.mask_flags	= 0,
+	},
+	{
+		.name		= "kernel",
+		.offset		= 0x00060000,
+		.size		= 0x00200000,
+		.mask_flags	= 0,
+	},
+	{
+		.name		= "root",
+		.offset		= 0x00260000,
+		.size		= MTDPART_SIZ_FULL,
+		.mask_flags	= 0,
+	},
+};
+
+static struct mtd_partition flash_1_parts[] = {
+	{
+		.name		= "2ndflash",
+		.offset		= 0x00000000,
+		.size		= MTDPART_SIZ_FULL,
+		.mask_flags	= 0,
+	},
+};
+
+static struct physmap_flash_data flash_data[] = {
+	{
+		.width		= 2,
+		.nr_parts	= ARRAY_SIZE(flash_0_parts),
+		.parts		= flash_0_parts,
+	},
+	{
+		.width		= 2,
+		.nr_parts	= ARRAY_SIZE(flash_1_parts),
+		.parts		= flash_1_parts,
+	}
+};
+
+static struct resource flash_resource[] = {
+	{
+		.start		= 0x00000000,
+		.end		= 0x03ffffff,
+		.flags		= IORESOURCE_MEM,
+	},
+	{
+		.start		= 0x04000000,
+		.end		= 0x07ffffff,
+		.flags		= IORESOURCE_MEM,
+	},
+};
+
+static struct platform_device flash_device[] = {
+	{
+		.name		= "physmap-flash",
+		.id		= 0,
+		.resource	= &flash_resource[0],
+		.num_resources	= 1,
+		.dev		= {
+			.platform_data	= &flash_data[0],
+		},
+	},
+	{
+		.name		= "physmap-flash",
+		.id		= 1,
+		.resource	= &flash_resource[1],
+		.num_resources	= 1,
+		.dev		= {
+			.platform_data	= &flash_data[1],
+		},
+	},
+};
+
+static int __init merisc_flash_init(void)
+{
+	int ret;
+	smc_set_timing(&flash_config, &flash_timing);
+
+	ret = smc_set_configuration(0, &flash_config);
+	if (ret < 0) {
+		printk(KERN_ERR "Merisc: failed to set NOR flash timing #0\n");
+		return ret;
+	}
+
+	ret = smc_set_configuration(4, &flash_config);
+	if (ret < 0) {
+		printk(KERN_ERR "Merisc: failed to set NOR flash timing #1\n");
+		return ret;
+	}
+
+	platform_device_register(&flash_device[0]);
+	platform_device_register(&flash_device[1]);
+	return 0;
+}
+device_initcall(merisc_flash_init);
diff --git a/arch/avr32/boards/merisc/merisc.h b/arch/avr32/boards/merisc/merisc.h
new file mode 100644
index 0000000..50ffb2f
--- /dev/null
+++ b/arch/avr32/boards/merisc/merisc.h
@@ -0,0 +1,18 @@
+/*
+ * Merisc exports
+ *
+ * Copyright (C) 2008 Martinsson Elektronik AB
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __ARCH_AVR32_BOARDS_MERISC_MERISC_H
+#define __ARCH_AVR32_BOARDS_MERISC_MERISC_H
+
+const char *merisc_revision(void);
+const char *merisc_model(void);
+
+extern struct class merisc_class;
+
+#endif /* __ARCH_AVR32_BOARDS_MERISC_MERISC_H */
diff --git a/arch/avr32/boards/merisc/merisc_sysfs.c b/arch/avr32/boards/merisc/merisc_sysfs.c
new file mode 100644
index 0000000..df431fd
--- /dev/null
+++ b/arch/avr32/boards/merisc/merisc_sysfs.c
@@ -0,0 +1,65 @@
+/*
+ * Merisc sysfs exports
+ *
+ * Copyright (C) 2008 Martinsson Elektronik AB
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/device.h>
+#include <linux/sysdev.h>
+#include <linux/timer.h>
+#include <linux/err.h>
+#include <linux/ctype.h>
+#include "merisc.h"
+
+static ssize_t merisc_model_show(struct class *class, char *buf)
+{
+	ssize_t ret = 0;
+
+	sprintf(buf, "%s\n", merisc_model());
+	ret = strlen(buf) + 1;
+
+	return ret;
+}
+
+static ssize_t merisc_revision_show(struct class *class, char *buf)
+{
+	ssize_t ret = 0;
+
+	sprintf(buf, "%s\n", merisc_revision());
+	ret = strlen(buf) + 1;
+
+	return ret;
+}
+
+static struct class_attribute merisc_class_attrs[] = {
+	__ATTR(model, S_IRUGO, merisc_model_show, NULL),
+	__ATTR(revision, S_IRUGO, merisc_revision_show, NULL),
+	__ATTR_NULL,
+};
+
+struct class merisc_class = {
+	.name =		"merisc",
+	.owner =	THIS_MODULE,
+	.class_attrs =	merisc_class_attrs,
+};
+
+static int __init merisc_sysfs_init(void)
+{
+	int status;
+
+	status = class_register(&merisc_class);
+	if (status < 0)
+		return status;
+
+	return 0;
+}
+
+postcore_initcall(merisc_sysfs_init);
diff --git a/arch/avr32/boards/merisc/setup.c b/arch/avr32/boards/merisc/setup.c
new file mode 100644
index 0000000..2dbca46
--- /dev/null
+++ b/arch/avr32/boards/merisc/setup.c
@@ -0,0 +1,289 @@
+/*
+ * Board-specific setup code for the Merisc
+ *
+ * Copyright (C) 2008 Martinsson Elektronik AB
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/clk.h>
+#include <linux/etherdevice.h>
+#include <linux/i2c.h>
+#include <linux/i2c-gpio.h>
+#include <linux/gpio.h>
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+#include <linux/leds.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/ads7846.h>
+#include <linux/irq.h>
+#include <linux/fb.h>
+#include <linux/atmel-mci.h>
+
+#include <asm/io.h>
+#include <asm/setup.h>
+#include <asm/gpio.h>
+
+#include <mach/at32ap700x.h>
+#include <mach/board.h>
+#include <mach/init.h>
+#include <mach/portmux.h>
+
+#include "merisc.h"
+
+/* Holds the autodetected board model and revision */
+static int merisc_board_id;
+
+/* Initialized by bootloader-specific startup code. */
+struct tag *bootloader_tags __initdata;
+
+/* Oscillator frequencies. These are board specific */
+unsigned long at32_board_osc_rates[3] = {
+	[0]	= 32768,	/* 32.768 kHz on RTC osc */
+	[1]	= 20000000,	/* 20 MHz on osc0 */
+	[2]	= 12000000,	/* 12 MHz on osc1 */
+};
+
+struct eth_addr {
+	u8 addr[6];
+};
+
+static struct eth_addr __initdata hw_addr[2];
+static struct eth_platform_data __initdata eth_data[2];
+
+static int ads7846_get_pendown_state_PB26(void)
+{
+	return !gpio_get_value(GPIO_PIN_PB(26));
+}
+
+static int ads7846_get_pendown_state_PB28(void)
+{
+	return !gpio_get_value(GPIO_PIN_PB(28));
+}
+
+static struct ads7846_platform_data __initdata ads7846_data = {
+	.model				= 7846,
+	.vref_delay_usecs		= 100,
+	.vref_mv			= 0,
+	.keep_vref_on			= 0,
+	.settle_delay_usecs		= 150,
+	.penirq_recheck_delay_usecs	= 1,
+	.x_plate_ohms			= 800,
+	.debounce_rep			= 4,
+	.debounce_max			= 10,
+	.debounce_tol			= 50,
+	.get_pendown_state		= ads7846_get_pendown_state_PB26,
+	.filter_init			= NULL,
+	.filter				= NULL,
+	.filter_cleanup			= NULL,
+};
+
+static struct spi_board_info __initdata spi0_board_info[] = {
+	{
+		.modalias	= "ads7846",
+		.max_speed_hz	= 3250000,
+		.chip_select	= 0,
+		.bus_num	= 0,
+		.platform_data	= &ads7846_data,
+		.mode		= SPI_MODE_0,
+	},
+};
+
+static struct mci_platform_data __initdata mci0_data = {
+	.slot[0] = {
+		.bus_width	= 4,
+		.detect_pin	= GPIO_PIN_PE(19),
+		.wp_pin		= GPIO_PIN_PE(20),
+	},
+};
+
+static int __init parse_tag_ethernet(struct tag *tag)
+{
+	int i;
+
+	i = tag->u.ethernet.mac_index;
+	if (i < ARRAY_SIZE(hw_addr)) {
+		memcpy(hw_addr[i].addr, tag->u.ethernet.hw_address,
+		       sizeof(hw_addr[i].addr));
+	}
+
+	return 0;
+}
+__tagtable(ATAG_ETHERNET, parse_tag_ethernet);
+
+static void __init set_hw_addr(struct platform_device *pdev)
+{
+	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	const u8 *addr;
+	void __iomem *regs;
+	struct clk *pclk;
+
+	if (!res)
+		return;
+
+	if (pdev->id >= ARRAY_SIZE(hw_addr))
+		return;
+
+	addr = hw_addr[pdev->id].addr;
+	if (!is_valid_ether_addr(addr))
+		return;
+
+	regs = (void __iomem __force *)res->start;
+	pclk = clk_get(&pdev->dev, "pclk");
+	if (!pclk)
+		return;
+
+	clk_enable(pclk);
+	__raw_writel((addr[3] << 24) | (addr[2] << 16)
+		     | (addr[1] << 8) | addr[0], regs + 0x98);
+	__raw_writel((addr[5] << 8) | addr[4], regs + 0x9c);
+	clk_disable(pclk);
+	clk_put(pclk);
+}
+
+static struct i2c_gpio_platform_data i2c_gpio_data = {
+	.sda_pin		= GPIO_PIN_PA(6),
+	.scl_pin		= GPIO_PIN_PA(7),
+	.sda_is_open_drain	= 1,
+	.scl_is_open_drain	= 1,
+	.udelay			= 2,
+};
+
+static struct platform_device i2c_gpio_device = {
+	.name	= "i2c-gpio",
+	.id	= 0,
+	.dev	= {
+		.platform_data	= &i2c_gpio_data,
+	},
+};
+
+#ifdef CONFIG_LEDS_ATMEL_PWM
+static struct gpio_led stk_pwm_led[] = {
+	{
+		.name	= "backlight",
+		.gpio	= 0,		/* PWM channel 0 (LCD backlight) */
+	},
+};
+
+static struct gpio_led_platform_data stk_pwm_led_data = {
+	.num_leds	= ARRAY_SIZE(stk_pwm_led),
+	.leds		= stk_pwm_led,
+};
+
+static struct platform_device stk_pwm_led_dev = {
+	.name	= "leds-atmel-pwm",
+	.id	= -1,
+	.dev	= {
+		.platform_data	= &stk_pwm_led_data,
+	},
+};
+#endif
+
+const char *merisc_model(void)
+{
+	switch (merisc_board_id) {
+	case 0:
+	case 1:
+		return "500-01";
+	case 2:
+		return "BT";
+	default:
+		return "Unknown";
+	}
+}
+
+const char *merisc_revision(void)
+{
+	switch (merisc_board_id) {
+	case 0:
+		return "B";
+	case 1:
+		return "D";
+	case 2:
+		return "A";
+	default:
+		return "Unknown";
+	}
+}
+
+static void detect_merisc_board_id(void)
+{
+	/* Board ID pins MUST be set as input or the board may be damaged */
+	at32_select_gpio(GPIO_PIN_PA(24), AT32_GPIOF_PULLUP);
+	at32_select_gpio(GPIO_PIN_PA(25), AT32_GPIOF_PULLUP);
+	at32_select_gpio(GPIO_PIN_PA(26), AT32_GPIOF_PULLUP);
+	at32_select_gpio(GPIO_PIN_PA(27), AT32_GPIOF_PULLUP);
+
+	merisc_board_id = !gpio_get_value(GPIO_PIN_PA(24)) +
+		!gpio_get_value(GPIO_PIN_PA(25)) * 2 +
+		!gpio_get_value(GPIO_PIN_PA(26)) * 4 +
+		!gpio_get_value(GPIO_PIN_PA(27)) * 8;
+}
+
+void __init setup_board(void)
+{
+	at32_map_usart(0, 0);
+	at32_map_usart(1, 1);
+	at32_map_usart(3, 3);
+	at32_setup_serial_console(1);
+}
+
+static int __init merisc_init(void)
+{
+	detect_merisc_board_id();
+
+	printk(KERN_NOTICE "BOARD: Merisc %s revision %s\n", merisc_model(),
+	       merisc_revision());
+
+	/* Reserve pins for SDRAM */
+	at32_reserve_pin(GPIO_PIOE_BASE, ATMEL_EBI_PE_DATA_ALL | (1 << 26));
+
+	if (merisc_board_id >= 1)
+		at32_map_usart(2, 2);
+
+	at32_add_device_usart(0);
+	at32_add_device_usart(1);
+	if (merisc_board_id >= 1)
+		at32_add_device_usart(2);
+	at32_add_device_usart(3);
+	set_hw_addr(at32_add_device_eth(0, &eth_data[0]));
+
+	/* ADS7846 PENIRQ */
+	if (merisc_board_id == 0) {
+		ads7846_data.get_pendown_state = ads7846_get_pendown_state_PB26;
+		at32_select_periph(GPIO_PIOB_BASE, 1 << 26,
+				   GPIO_PERIPH_A, AT32_GPIOF_PULLUP);
+		spi0_board_info[0].irq = AT32_EXTINT(1);
+	} else {
+		ads7846_data.get_pendown_state = ads7846_get_pendown_state_PB28;
+		at32_select_periph(GPIO_PIOB_BASE, 1 << 28, GPIO_PERIPH_A,
+				   AT32_GPIOF_PULLUP);
+		spi0_board_info[0].irq = AT32_EXTINT(3);
+	}
+
+	/* ADS7846 busy pin */
+	at32_select_gpio(GPIO_PIN_PA(4), AT32_GPIOF_PULLUP);
+
+	at32_add_device_spi(0, spi0_board_info, ARRAY_SIZE(spi0_board_info));
+
+	at32_add_device_mci(0, &mci0_data);
+
+#ifdef CONFIG_LEDS_ATMEL_PWM
+	at32_add_device_pwm((1 << 0) | (1 << 2));
+	platform_device_register(&stk_pwm_led_dev);
+#else
+	at32_add_device_pwm((1 << 2));
+#endif
+
+	at32_select_gpio(i2c_gpio_data.sda_pin,
+		AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
+	at32_select_gpio(i2c_gpio_data.scl_pin,
+		AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
+	platform_device_register(&i2c_gpio_device);
+
+	return 0;
+}
+postcore_initcall(merisc_init);