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// SPDX-License-Identifier: GPL-2.0
/*
* DSM-G600 board-setup
*
* Copyright (C) 2008 Rod Whitby <rod@whitby.id.au>
* Copyright (C) 2006 Tower Technologies
*
* based on ixdp425-setup.c:
* Copyright (C) 2003-2004 MontaVista Software, Inc.
* based on nslu2-power.c:
* Copyright (C) 2005 Tower Technologies
* based on nslu2-io.c:
* Copyright (C) 2004 Karen Spearel
*
* Author: Alessandro Zummo <a.zummo@towertech.it>
* Author: Michael Westerhof <mwester@dls.net>
* Author: Rod Whitby <rod@whitby.id.au>
* Maintainers: http://www.nslu2-linux.org/
*/
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/serial.h>
#include <linux/serial_8250.h>
#include <linux/leds.h>
#include <linux/reboot.h>
#include <linux/i2c.h>
#include <linux/gpio/machine.h>
#include <mach/hardware.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/flash.h>
#include <asm/mach/time.h>
#include "irqs.h"
#define DSMG600_SDA_PIN 5
#define DSMG600_SCL_PIN 4
/* DSM-G600 Timer Setting */
#define DSMG600_FREQ 66000000
/* Buttons */
#define DSMG600_PB_GPIO 15 /* power button */
#define DSMG600_RB_GPIO 3 /* reset button */
/* Power control */
#define DSMG600_PO_GPIO 2 /* power off */
/* LEDs */
#define DSMG600_LED_PWR_GPIO 0
#define DSMG600_LED_WLAN_GPIO 14
static struct flash_platform_data dsmg600_flash_data = {
.map_name = "cfi_probe",
.width = 2,
};
static struct resource dsmg600_flash_resource = {
.flags = IORESOURCE_MEM,
};
static struct platform_device dsmg600_flash = {
.name = "IXP4XX-Flash",
.id = 0,
.dev.platform_data = &dsmg600_flash_data,
.num_resources = 1,
.resource = &dsmg600_flash_resource,
};
static struct gpiod_lookup_table dsmg600_i2c_gpiod_table = {
.dev_id = "i2c-gpio.0",
.table = {
GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SDA_PIN,
NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SCL_PIN,
NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
},
};
static struct platform_device dsmg600_i2c_gpio = {
.name = "i2c-gpio",
.id = 0,
.dev = {
.platform_data = NULL,
},
};
static struct i2c_board_info __initdata dsmg600_i2c_board_info [] = {
{
I2C_BOARD_INFO("pcf8563", 0x51),
},
};
static struct gpio_led dsmg600_led_pins[] = {
{
.name = "dsmg600:green:power",
.gpio = DSMG600_LED_PWR_GPIO,
},
{
.name = "dsmg600:green:wlan",
.gpio = DSMG600_LED_WLAN_GPIO,
.active_low = true,
},
};
static struct gpio_led_platform_data dsmg600_led_data = {
.num_leds = ARRAY_SIZE(dsmg600_led_pins),
.leds = dsmg600_led_pins,
};
static struct platform_device dsmg600_leds = {
.name = "leds-gpio",
.id = -1,
.dev.platform_data = &dsmg600_led_data,
};
static struct resource dsmg600_uart_resources[] = {
{
.start = IXP4XX_UART1_BASE_PHYS,
.end = IXP4XX_UART1_BASE_PHYS + 0x0fff,
.flags = IORESOURCE_MEM,
},
{
.start = IXP4XX_UART2_BASE_PHYS,
.end = IXP4XX_UART2_BASE_PHYS + 0x0fff,
.flags = IORESOURCE_MEM,
}
};
static struct plat_serial8250_port dsmg600_uart_data[] = {
{
.mapbase = IXP4XX_UART1_BASE_PHYS,
.membase = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
.irq = IRQ_IXP4XX_UART1,
.flags = UPF_BOOT_AUTOCONF,
.iotype = UPIO_MEM,
.regshift = 2,
.uartclk = IXP4XX_UART_XTAL,
},
{
.mapbase = IXP4XX_UART2_BASE_PHYS,
.membase = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
.irq = IRQ_IXP4XX_UART2,
.flags = UPF_BOOT_AUTOCONF,
.iotype = UPIO_MEM,
.regshift = 2,
.uartclk = IXP4XX_UART_XTAL,
},
{ }
};
static struct platform_device dsmg600_uart = {
.name = "serial8250",
.id = PLAT8250_DEV_PLATFORM,
.dev.platform_data = dsmg600_uart_data,
.num_resources = ARRAY_SIZE(dsmg600_uart_resources),
.resource = dsmg600_uart_resources,
};
static struct platform_device *dsmg600_devices[] __initdata = {
&dsmg600_i2c_gpio,
&dsmg600_flash,
&dsmg600_leds,
};
static void dsmg600_power_off(void)
{
/* enable the pwr cntl and drive it high */
gpio_direction_output(DSMG600_PO_GPIO, 1);
}
/* This is used to make sure the power-button pusher is serious. The button
* must be held until the value of this counter reaches zero.
*/
static int power_button_countdown;
/* Must hold the button down for at least this many counts to be processed */
#define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
static void dsmg600_power_handler(struct timer_list *unused);
static DEFINE_TIMER(dsmg600_power_timer, dsmg600_power_handler);
static void dsmg600_power_handler(struct timer_list *unused)
{
/* This routine is called twice per second to check the
* state of the power button.
*/
if (gpio_get_value(DSMG600_PB_GPIO)) {
/* IO Pin is 1 (button pushed) */
if (power_button_countdown > 0)
power_button_countdown--;
} else {
/* Done on button release, to allow for auto-power-on mods. */
if (power_button_countdown == 0) {
/* Signal init to do the ctrlaltdel action,
* this will bypass init if it hasn't started
* and do a kernel_restart.
*/
ctrl_alt_del();
/* Change the state of the power LED to "blink" */
gpio_set_value(DSMG600_LED_PWR_GPIO, 0);
} else {
power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
}
}
mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
}
static irqreturn_t dsmg600_reset_handler(int irq, void *dev_id)
{
/* This is the paper-clip reset, it shuts the machine down directly. */
machine_power_off();
return IRQ_HANDLED;
}
static void __init dsmg600_timer_init(void)
{
/* The xtal on this machine is non-standard. */
ixp4xx_timer_freq = DSMG600_FREQ;
/* Call standard timer_init function. */
ixp4xx_timer_init();
}
static int __init dsmg600_gpio_init(void)
{
if (!machine_is_dsmg600())
return 0;
gpio_request(DSMG600_RB_GPIO, "reset button");
if (request_irq(gpio_to_irq(DSMG600_RB_GPIO), &dsmg600_reset_handler,
IRQF_TRIGGER_LOW, "DSM-G600 reset button", NULL) < 0) {
printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
gpio_to_irq(DSMG600_RB_GPIO));
}
/*
* The power button on the D-Link DSM-G600 is on GPIO 15, but
* it cannot handle interrupts on that GPIO line. So we'll
* have to poll it with a kernel timer.
*/
/* Make sure that the power button GPIO is set up as an input */
gpio_request(DSMG600_PB_GPIO, "power button");
gpio_direction_input(DSMG600_PB_GPIO);
/* Request poweroff GPIO line */
gpio_request(DSMG600_PO_GPIO, "power off button");
/* Set the initial value for the power button IRQ handler */
power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
return 0;
}
device_initcall(dsmg600_gpio_init);
static void __init dsmg600_init(void)
{
ixp4xx_sys_init();
dsmg600_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
dsmg600_flash_resource.end =
IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
gpiod_add_lookup_table(&dsmg600_i2c_gpiod_table);
i2c_register_board_info(0, dsmg600_i2c_board_info,
ARRAY_SIZE(dsmg600_i2c_board_info));
/* The UART is required on the DSM-G600 (Redboot cannot use the
* NIC) -- do it here so that it does *not* get removed if
* platform_add_devices fails!
*/
(void)platform_device_register(&dsmg600_uart);
platform_add_devices(dsmg600_devices, ARRAY_SIZE(dsmg600_devices));
pm_power_off = dsmg600_power_off;
}
MACHINE_START(DSMG600, "D-Link DSM-G600 RevA")
/* Maintainer: www.nslu2-linux.org */
.atag_offset = 0x100,
.map_io = ixp4xx_map_io,
.init_early = ixp4xx_init_early,
.init_irq = ixp4xx_init_irq,
.init_time = dsmg600_timer_init,
.init_machine = dsmg600_init,
#if defined(CONFIG_PCI)
.dma_zone_size = SZ_64M,
#endif
.restart = ixp4xx_restart,
MACHINE_END
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