299 lines
6.7 KiB
C
299 lines
6.7 KiB
C
/*
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* Board-specific setup code for the Merisc
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*
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* Copyright (C) 2008 Martinsson Elektronik AB
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/clk.h>
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#include <linux/etherdevice.h>
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#include <linux/i2c.h>
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#include <linux/i2c-gpio.h>
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#include <linux/gpio.h>
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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <linux/platform_device.h>
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#include <linux/types.h>
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#include <linux/leds.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/ads7846.h>
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#include <linux/irq.h>
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#include <linux/fb.h>
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#include <linux/atmel-mci.h>
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#include <asm/io.h>
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#include <asm/setup.h>
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#include <asm/gpio.h>
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#include <mach/at32ap700x.h>
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#include <mach/board.h>
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#include <mach/init.h>
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#include <mach/portmux.h>
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#include "merisc.h"
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/* Holds the autodetected board model and revision */
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static int merisc_board_id;
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/* Initialized by bootloader-specific startup code. */
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struct tag *bootloader_tags __initdata;
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/* Oscillator frequencies. These are board specific */
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unsigned long at32_board_osc_rates[3] = {
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[0] = 32768, /* 32.768 kHz on RTC osc */
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[1] = 20000000, /* 20 MHz on osc0 */
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[2] = 12000000, /* 12 MHz on osc1 */
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};
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struct eth_addr {
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u8 addr[6];
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};
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static struct eth_addr __initdata hw_addr[2];
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static struct eth_platform_data __initdata eth_data[2];
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static int ads7846_get_pendown_state_PB26(void)
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{
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return !gpio_get_value(GPIO_PIN_PB(26));
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}
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static int ads7846_get_pendown_state_PB28(void)
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{
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return !gpio_get_value(GPIO_PIN_PB(28));
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}
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static struct ads7846_platform_data __initdata ads7846_data = {
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.model = 7846,
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.vref_delay_usecs = 100,
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.vref_mv = 0,
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.keep_vref_on = 0,
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.settle_delay_usecs = 150,
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.penirq_recheck_delay_usecs = 1,
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.x_plate_ohms = 800,
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.debounce_rep = 4,
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.debounce_max = 10,
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.debounce_tol = 50,
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.get_pendown_state = ads7846_get_pendown_state_PB26,
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.filter_init = NULL,
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.filter = NULL,
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.filter_cleanup = NULL,
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};
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static struct spi_board_info __initdata spi0_board_info[] = {
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{
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.modalias = "ads7846",
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.max_speed_hz = 3250000,
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.chip_select = 0,
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.bus_num = 0,
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.platform_data = &ads7846_data,
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.mode = SPI_MODE_0,
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},
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};
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static struct mci_platform_data __initdata mci0_data = {
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.slot[0] = {
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.bus_width = 4,
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.detect_pin = GPIO_PIN_PE(19),
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.wp_pin = GPIO_PIN_PE(20),
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.detect_is_active_high = true,
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},
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};
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static int __init parse_tag_ethernet(struct tag *tag)
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{
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int i;
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i = tag->u.ethernet.mac_index;
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if (i < ARRAY_SIZE(hw_addr)) {
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memcpy(hw_addr[i].addr, tag->u.ethernet.hw_address,
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sizeof(hw_addr[i].addr));
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}
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return 0;
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}
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__tagtable(ATAG_ETHERNET, parse_tag_ethernet);
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static void __init set_hw_addr(struct platform_device *pdev)
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{
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struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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const u8 *addr;
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void __iomem *regs;
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struct clk *pclk;
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if (!res)
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return;
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if (pdev->id >= ARRAY_SIZE(hw_addr))
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return;
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addr = hw_addr[pdev->id].addr;
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if (!is_valid_ether_addr(addr))
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return;
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regs = (void __iomem __force *)res->start;
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pclk = clk_get(&pdev->dev, "pclk");
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if (!pclk)
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return;
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clk_enable(pclk);
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__raw_writel((addr[3] << 24) | (addr[2] << 16)
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| (addr[1] << 8) | addr[0], regs + 0x98);
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__raw_writel((addr[5] << 8) | addr[4], regs + 0x9c);
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clk_disable(pclk);
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clk_put(pclk);
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}
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static struct i2c_gpio_platform_data i2c_gpio_data = {
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.sda_pin = GPIO_PIN_PA(6),
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.scl_pin = GPIO_PIN_PA(7),
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.sda_is_open_drain = 1,
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.scl_is_open_drain = 1,
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.udelay = 2,
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};
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static struct platform_device i2c_gpio_device = {
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.name = "i2c-gpio",
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.id = 0,
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.dev = {
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.platform_data = &i2c_gpio_data,
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},
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};
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static struct i2c_board_info __initdata i2c_info[] = {
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{
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I2C_BOARD_INFO("pcf8563", 0x51)
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},
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};
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#ifdef CONFIG_LEDS_ATMEL_PWM
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static struct gpio_led stk_pwm_led[] = {
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{
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.name = "backlight",
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.gpio = 0, /* PWM channel 0 (LCD backlight) */
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},
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};
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static struct gpio_led_platform_data stk_pwm_led_data = {
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.num_leds = ARRAY_SIZE(stk_pwm_led),
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.leds = stk_pwm_led,
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};
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static struct platform_device stk_pwm_led_dev = {
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.name = "leds-atmel-pwm",
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.id = -1,
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.dev = {
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.platform_data = &stk_pwm_led_data,
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},
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};
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#endif
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const char *merisc_model(void)
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{
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switch (merisc_board_id) {
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case 0:
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case 1:
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return "500-01";
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case 2:
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return "BT";
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default:
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return "Unknown";
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}
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}
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const char *merisc_revision(void)
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{
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switch (merisc_board_id) {
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case 0:
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return "B";
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case 1:
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return "D";
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case 2:
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return "A";
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default:
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return "Unknown";
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}
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}
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static void detect_merisc_board_id(void)
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{
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/* Board ID pins MUST be set as input or the board may be damaged */
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at32_select_gpio(GPIO_PIN_PA(24), AT32_GPIOF_PULLUP);
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at32_select_gpio(GPIO_PIN_PA(25), AT32_GPIOF_PULLUP);
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at32_select_gpio(GPIO_PIN_PA(26), AT32_GPIOF_PULLUP);
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at32_select_gpio(GPIO_PIN_PA(27), AT32_GPIOF_PULLUP);
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merisc_board_id = !gpio_get_value(GPIO_PIN_PA(24)) +
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!gpio_get_value(GPIO_PIN_PA(25)) * 2 +
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!gpio_get_value(GPIO_PIN_PA(26)) * 4 +
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!gpio_get_value(GPIO_PIN_PA(27)) * 8;
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}
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void __init setup_board(void)
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{
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at32_map_usart(0, 0, 0);
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at32_map_usart(1, 1, 0);
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at32_map_usart(3, 3, 0);
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at32_setup_serial_console(1);
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}
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static int __init merisc_init(void)
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{
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detect_merisc_board_id();
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printk(KERN_NOTICE "BOARD: Merisc %s revision %s\n", merisc_model(),
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merisc_revision());
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/* Reserve pins for SDRAM */
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at32_reserve_pin(GPIO_PIOE_BASE, ATMEL_EBI_PE_DATA_ALL | (1 << 26));
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if (merisc_board_id >= 1)
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at32_map_usart(2, 2, 0);
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at32_add_device_usart(0);
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at32_add_device_usart(1);
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if (merisc_board_id >= 1)
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at32_add_device_usart(2);
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at32_add_device_usart(3);
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set_hw_addr(at32_add_device_eth(0, ð_data[0]));
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/* ADS7846 PENIRQ */
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if (merisc_board_id == 0) {
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ads7846_data.get_pendown_state = ads7846_get_pendown_state_PB26;
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at32_select_periph(GPIO_PIOB_BASE, 1 << 26,
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GPIO_PERIPH_A, AT32_GPIOF_PULLUP);
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spi0_board_info[0].irq = AT32_EXTINT(1);
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} else {
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ads7846_data.get_pendown_state = ads7846_get_pendown_state_PB28;
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at32_select_periph(GPIO_PIOB_BASE, 1 << 28, GPIO_PERIPH_A,
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AT32_GPIOF_PULLUP);
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spi0_board_info[0].irq = AT32_EXTINT(3);
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}
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/* ADS7846 busy pin */
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at32_select_gpio(GPIO_PIN_PA(4), AT32_GPIOF_PULLUP);
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at32_add_device_spi(0, spi0_board_info, ARRAY_SIZE(spi0_board_info));
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at32_add_device_mci(0, &mci0_data);
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#ifdef CONFIG_LEDS_ATMEL_PWM
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at32_add_device_pwm((1 << 0) | (1 << 2));
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platform_device_register(&stk_pwm_led_dev);
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#else
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at32_add_device_pwm((1 << 2));
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#endif
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at32_select_gpio(i2c_gpio_data.sda_pin,
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AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
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at32_select_gpio(i2c_gpio_data.scl_pin,
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AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
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platform_device_register(&i2c_gpio_device);
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i2c_register_board_info(0, i2c_info, ARRAY_SIZE(i2c_info));
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return 0;
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}
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postcore_initcall(merisc_init);
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