cregit-Linux how code gets into the kernel

Release 4.17 arch/arm/mach-ixp4xx/dsmg600-setup.c

// 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>


#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); }

Contributors

PersonTokensPropCommitsCommitProp
Michael-Luke Jones1381.25%150.00%
Linus Walleij318.75%150.00%
Total16100.00%2100.00%

/* 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)); }

Contributors

PersonTokensPropCommitsCommitProp
Rod Whitby6992.00%133.33%
Kees Cook45.33%133.33%
Linus Walleij22.67%133.33%
Total75100.00%3100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Rod Whitby20100.00%1100.00%
Total20100.00%1100.00%


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(); }

Contributors

PersonTokensPropCommitsCommitProp
Michael-Luke Jones18100.00%1100.00%
Total18100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Walleij102100.00%1100.00%
Total102100.00%1100.00%

device_initcall(dsmg600_gpio_init);
static void __init dsmg600_init(void) { ixp4xx_sys_init(); /* Make sure that GPIO14 and GPIO15 are not used as clocks */ *IXP4XX_GPIO_GPCLKR = 0; 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; }

Contributors

PersonTokensPropCommitsCommitProp
Michael-Luke Jones6073.17%125.00%
Rod Whitby1619.51%250.00%
Linus Walleij67.32%125.00%
Total82100.00%4100.00%

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

Overall Contributors

PersonTokensPropCommitsCommitProp
Michael-Luke Jones49253.07%313.64%
Rod Whitby19621.14%313.64%
Linus Walleij15516.72%418.18%
Krzysztof Hałasa394.21%14.55%
Nico Pitre151.62%29.09%
Russell King80.86%29.09%
Kees Cook80.86%14.55%
Rob Herring50.54%14.55%
Robin Holt30.32%14.55%
Stephen Warren20.22%14.55%
Richard Purdie20.22%14.55%
Jean Delvare10.11%14.55%
Greg Kroah-Hartman10.11%14.55%
Total927100.00%22100.00%
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