306 lines
7.7 KiB
C
306 lines
7.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* DSM-G600 board-setup
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*
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* Copyright (C) 2008 Rod Whitby <rod@whitby.id.au>
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* Copyright (C) 2006 Tower Technologies
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*
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* based on ixdp425-setup.c:
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* Copyright (C) 2003-2004 MontaVista Software, Inc.
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* based on nslu2-power.c:
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* Copyright (C) 2005 Tower Technologies
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* based on nslu2-io.c:
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* Copyright (C) 2004 Karen Spearel
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*
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* Author: Alessandro Zummo <a.zummo@towertech.it>
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* Author: Michael Westerhof <mwester@dls.net>
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* Author: Rod Whitby <rod@whitby.id.au>
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* Maintainers: http://www.nslu2-linux.org/
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*/
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#include <linux/gpio.h>
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#include <linux/irq.h>
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#include <linux/jiffies.h>
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#include <linux/timer.h>
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#include <linux/serial.h>
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#include <linux/serial_8250.h>
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#include <linux/leds.h>
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#include <linux/reboot.h>
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#include <linux/i2c.h>
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#include <linux/gpio/machine.h>
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#include <mach/hardware.h>
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#include <asm/mach-types.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/flash.h>
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#include <asm/mach/time.h>
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#define DSMG600_SDA_PIN 5
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#define DSMG600_SCL_PIN 4
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/* DSM-G600 Timer Setting */
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#define DSMG600_FREQ 66000000
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/* Buttons */
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#define DSMG600_PB_GPIO 15 /* power button */
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#define DSMG600_RB_GPIO 3 /* reset button */
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/* Power control */
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#define DSMG600_PO_GPIO 2 /* power off */
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/* LEDs */
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#define DSMG600_LED_PWR_GPIO 0
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#define DSMG600_LED_WLAN_GPIO 14
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static struct flash_platform_data dsmg600_flash_data = {
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.map_name = "cfi_probe",
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.width = 2,
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};
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static struct resource dsmg600_flash_resource = {
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.flags = IORESOURCE_MEM,
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};
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static struct platform_device dsmg600_flash = {
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.name = "IXP4XX-Flash",
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.id = 0,
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.dev.platform_data = &dsmg600_flash_data,
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.num_resources = 1,
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.resource = &dsmg600_flash_resource,
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};
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static struct gpiod_lookup_table dsmg600_i2c_gpiod_table = {
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.dev_id = "i2c-gpio.0",
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.table = {
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GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SDA_PIN,
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NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
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GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SCL_PIN,
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NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
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},
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};
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static struct platform_device dsmg600_i2c_gpio = {
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.name = "i2c-gpio",
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.id = 0,
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.dev = {
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.platform_data = NULL,
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},
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};
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static struct i2c_board_info __initdata dsmg600_i2c_board_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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static struct gpio_led dsmg600_led_pins[] = {
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{
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.name = "dsmg600:green:power",
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.gpio = DSMG600_LED_PWR_GPIO,
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},
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{
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.name = "dsmg600:green:wlan",
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.gpio = DSMG600_LED_WLAN_GPIO,
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.active_low = true,
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},
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};
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static struct gpio_led_platform_data dsmg600_led_data = {
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.num_leds = ARRAY_SIZE(dsmg600_led_pins),
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.leds = dsmg600_led_pins,
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};
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static struct platform_device dsmg600_leds = {
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.name = "leds-gpio",
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.id = -1,
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.dev.platform_data = &dsmg600_led_data,
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};
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static struct resource dsmg600_uart_resources[] = {
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{
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.start = IXP4XX_UART1_BASE_PHYS,
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.end = IXP4XX_UART1_BASE_PHYS + 0x0fff,
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.flags = IORESOURCE_MEM,
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},
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{
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.start = IXP4XX_UART2_BASE_PHYS,
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.end = IXP4XX_UART2_BASE_PHYS + 0x0fff,
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.flags = IORESOURCE_MEM,
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}
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};
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static struct plat_serial8250_port dsmg600_uart_data[] = {
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{
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.mapbase = IXP4XX_UART1_BASE_PHYS,
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.membase = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
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.irq = IRQ_IXP4XX_UART1,
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.flags = UPF_BOOT_AUTOCONF,
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.iotype = UPIO_MEM,
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.regshift = 2,
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.uartclk = IXP4XX_UART_XTAL,
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},
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{
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.mapbase = IXP4XX_UART2_BASE_PHYS,
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.membase = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
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.irq = IRQ_IXP4XX_UART2,
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.flags = UPF_BOOT_AUTOCONF,
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.iotype = UPIO_MEM,
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.regshift = 2,
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.uartclk = IXP4XX_UART_XTAL,
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},
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{ }
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};
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static struct platform_device dsmg600_uart = {
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.name = "serial8250",
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.id = PLAT8250_DEV_PLATFORM,
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.dev.platform_data = dsmg600_uart_data,
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.num_resources = ARRAY_SIZE(dsmg600_uart_resources),
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.resource = dsmg600_uart_resources,
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};
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static struct platform_device *dsmg600_devices[] __initdata = {
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&dsmg600_i2c_gpio,
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&dsmg600_flash,
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&dsmg600_leds,
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};
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static void dsmg600_power_off(void)
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{
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/* enable the pwr cntl and drive it high */
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gpio_direction_output(DSMG600_PO_GPIO, 1);
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}
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/* This is used to make sure the power-button pusher is serious. The button
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* must be held until the value of this counter reaches zero.
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*/
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static int power_button_countdown;
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/* Must hold the button down for at least this many counts to be processed */
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#define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
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static void dsmg600_power_handler(struct timer_list *unused);
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static DEFINE_TIMER(dsmg600_power_timer, dsmg600_power_handler);
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static void dsmg600_power_handler(struct timer_list *unused)
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{
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/* This routine is called twice per second to check the
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* state of the power button.
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*/
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if (gpio_get_value(DSMG600_PB_GPIO)) {
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/* IO Pin is 1 (button pushed) */
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if (power_button_countdown > 0)
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power_button_countdown--;
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} else {
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/* Done on button release, to allow for auto-power-on mods. */
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if (power_button_countdown == 0) {
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/* Signal init to do the ctrlaltdel action,
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* this will bypass init if it hasn't started
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* and do a kernel_restart.
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*/
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ctrl_alt_del();
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/* Change the state of the power LED to "blink" */
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gpio_set_value(DSMG600_LED_PWR_GPIO, 0);
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} else {
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power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
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}
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}
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mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
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}
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static irqreturn_t dsmg600_reset_handler(int irq, void *dev_id)
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{
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/* This is the paper-clip reset, it shuts the machine down directly. */
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machine_power_off();
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return IRQ_HANDLED;
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}
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static void __init dsmg600_timer_init(void)
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{
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/* The xtal on this machine is non-standard. */
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ixp4xx_timer_freq = DSMG600_FREQ;
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/* Call standard timer_init function. */
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ixp4xx_timer_init();
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}
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static int __init dsmg600_gpio_init(void)
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{
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if (!machine_is_dsmg600())
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return 0;
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gpio_request(DSMG600_RB_GPIO, "reset button");
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if (request_irq(gpio_to_irq(DSMG600_RB_GPIO), &dsmg600_reset_handler,
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IRQF_TRIGGER_LOW, "DSM-G600 reset button", NULL) < 0) {
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printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
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gpio_to_irq(DSMG600_RB_GPIO));
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}
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/*
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* The power button on the D-Link DSM-G600 is on GPIO 15, but
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* it cannot handle interrupts on that GPIO line. So we'll
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* have to poll it with a kernel timer.
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*/
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/* Make sure that the power button GPIO is set up as an input */
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gpio_request(DSMG600_PB_GPIO, "power button");
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gpio_direction_input(DSMG600_PB_GPIO);
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/* Request poweroff GPIO line */
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gpio_request(DSMG600_PO_GPIO, "power off button");
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/* Set the initial value for the power button IRQ handler */
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power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
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mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
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return 0;
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}
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device_initcall(dsmg600_gpio_init);
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static void __init dsmg600_init(void)
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{
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ixp4xx_sys_init();
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/* Make sure that GPIO14 and GPIO15 are not used as clocks */
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*IXP4XX_GPIO_GPCLKR = 0;
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dsmg600_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
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dsmg600_flash_resource.end =
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IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
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gpiod_add_lookup_table(&dsmg600_i2c_gpiod_table);
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i2c_register_board_info(0, dsmg600_i2c_board_info,
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ARRAY_SIZE(dsmg600_i2c_board_info));
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/* The UART is required on the DSM-G600 (Redboot cannot use the
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* NIC) -- do it here so that it does *not* get removed if
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* platform_add_devices fails!
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*/
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(void)platform_device_register(&dsmg600_uart);
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platform_add_devices(dsmg600_devices, ARRAY_SIZE(dsmg600_devices));
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pm_power_off = dsmg600_power_off;
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}
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MACHINE_START(DSMG600, "D-Link DSM-G600 RevA")
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/* Maintainer: www.nslu2-linux.org */
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.atag_offset = 0x100,
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.map_io = ixp4xx_map_io,
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.init_early = ixp4xx_init_early,
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.init_irq = ixp4xx_init_irq,
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.init_time = dsmg600_timer_init,
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.init_machine = dsmg600_init,
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#if defined(CONFIG_PCI)
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.dma_zone_size = SZ_64M,
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#endif
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.restart = ixp4xx_restart,
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MACHINE_END
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