LXR linux/arch/arm/mach-ixp4xx/dsmg600-setup.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * DSM-G600 board-setup
   4 *
   5 * Copyright (C) 2008 Rod Whitby <rod@whitby.id.au>
   6 * Copyright (C) 2006 Tower Technologies
   7 *
   8 * based on ixdp425-setup.c:
   9 *      Copyright (C) 2003-2004 MontaVista Software, Inc.
  10 * based on nslu2-power.c:
  11 *      Copyright (C) 2005 Tower Technologies
  12 * based on nslu2-io.c:
  13 *      Copyright (C) 2004 Karen Spearel
  14 *
  15 * Author: Alessandro Zummo <a.zummo@towertech.it>
  16 * Author: Michael Westerhof <mwester@dls.net>
  17 * Author: Rod Whitby <rod@whitby.id.au>
  18 * Maintainers: http://www.nslu2-linux.org/
  19 */
  20#include <linux/gpio.h>
  21#include <linux/irq.h>
  22#include <linux/jiffies.h>
  23#include <linux/timer.h>
  24#include <linux/serial.h>
  25#include <linux/serial_8250.h>
  26#include <linux/leds.h>
  27#include <linux/reboot.h>
  28#include <linux/i2c.h>
  29#include <linux/gpio/machine.h>
  30
  31#include <mach/hardware.h>
  32
  33#include <asm/mach-types.h>
  34#include <asm/mach/arch.h>
  35#include <asm/mach/flash.h>
  36#include <asm/mach/time.h>
  37
  38#include "irqs.h"
  39
  40#define DSMG600_SDA_PIN         5
  41#define DSMG600_SCL_PIN         4
  42
  43/* DSM-G600 Timer Setting */
  44#define DSMG600_FREQ            66000000
  45
  46/* Buttons */
  47#define DSMG600_PB_GPIO         15      /* power button */
  48#define DSMG600_RB_GPIO         3       /* reset button */
  49
  50/* Power control */
  51#define DSMG600_PO_GPIO         2       /* power off */
  52
  53/* LEDs */
  54#define DSMG600_LED_PWR_GPIO    0
  55#define DSMG600_LED_WLAN_GPIO   14
  56
  57static struct flash_platform_data dsmg600_flash_data = {
  58        .map_name               = "cfi_probe",
  59        .width                  = 2,
  60};
  61
  62static struct resource dsmg600_flash_resource = {
  63        .flags                  = IORESOURCE_MEM,
  64};
  65
  66static struct platform_device dsmg600_flash = {
  67        .name                   = "IXP4XX-Flash",
  68        .id                     = 0,
  69        .dev.platform_data      = &dsmg600_flash_data,
  70        .num_resources          = 1,
  71        .resource               = &dsmg600_flash_resource,
  72};
  73
  74static struct gpiod_lookup_table dsmg600_i2c_gpiod_table = {
  75        .dev_id         = "i2c-gpio.0",
  76        .table          = {
  77                GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SDA_PIN,
  78                                NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
  79                GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SCL_PIN,
  80                                NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
  81        },
  82};
  83
  84static struct platform_device dsmg600_i2c_gpio = {
  85        .name                   = "i2c-gpio",
  86        .id                     = 0,
  87        .dev     = {
  88                .platform_data  = NULL,
  89        },
  90};
  91
  92static struct i2c_board_info __initdata dsmg600_i2c_board_info [] = {
  93        {
  94                I2C_BOARD_INFO("pcf8563", 0x51),
  95        },
  96};
  97
  98static struct gpio_led dsmg600_led_pins[] = {
  99        {
 100                .name           = "dsmg600:green:power",
 101                .gpio           = DSMG600_LED_PWR_GPIO,
 102        },
 103        {
 104                .name           = "dsmg600:green:wlan",
 105                .gpio           = DSMG600_LED_WLAN_GPIO,
 106                .active_low     = true,
 107        },
 108};
 109
 110static struct gpio_led_platform_data dsmg600_led_data = {
 111        .num_leds               = ARRAY_SIZE(dsmg600_led_pins),
 112        .leds                   = dsmg600_led_pins,
 113};
 114
 115static struct platform_device dsmg600_leds = {
 116        .name                   = "leds-gpio",
 117        .id                     = -1,
 118        .dev.platform_data      = &dsmg600_led_data,
 119};
 120
 121static struct resource dsmg600_uart_resources[] = {
 122        {
 123                .start          = IXP4XX_UART1_BASE_PHYS,
 124                .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
 125                .flags          = IORESOURCE_MEM,
 126        },
 127        {
 128                .start          = IXP4XX_UART2_BASE_PHYS,
 129                .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
 130                .flags          = IORESOURCE_MEM,
 131        }
 132};
 133
 134static struct plat_serial8250_port dsmg600_uart_data[] = {
 135        {
 136                .mapbase        = IXP4XX_UART1_BASE_PHYS,
 137                .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
 138                .irq            = IRQ_IXP4XX_UART1,
 139                .flags          = UPF_BOOT_AUTOCONF,
 140                .iotype         = UPIO_MEM,
 141                .regshift       = 2,
 142                .uartclk        = IXP4XX_UART_XTAL,
 143        },
 144        {
 145                .mapbase        = IXP4XX_UART2_BASE_PHYS,
 146                .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 147                .irq            = IRQ_IXP4XX_UART2,
 148                .flags          = UPF_BOOT_AUTOCONF,
 149                .iotype         = UPIO_MEM,
 150                .regshift       = 2,
 151                .uartclk        = IXP4XX_UART_XTAL,
 152        },
 153        { }
 154};
 155
 156static struct platform_device dsmg600_uart = {
 157        .name                   = "serial8250",
 158        .id                     = PLAT8250_DEV_PLATFORM,
 159        .dev.platform_data      = dsmg600_uart_data,
 160        .num_resources          = ARRAY_SIZE(dsmg600_uart_resources),
 161        .resource               = dsmg600_uart_resources,
 162};
 163
 164static struct platform_device *dsmg600_devices[] __initdata = {
 165        &dsmg600_i2c_gpio,
 166        &dsmg600_flash,
 167        &dsmg600_leds,
 168};
 169
 170static void dsmg600_power_off(void)
 171{
 172        /* enable the pwr cntl and drive it high */
 173        gpio_direction_output(DSMG600_PO_GPIO, 1);
 174}
 175
 176/* This is used to make sure the power-button pusher is serious.  The button
 177 * must be held until the value of this counter reaches zero.
 178 */
 179static int power_button_countdown;
 180
 181/* Must hold the button down for at least this many counts to be processed */
 182#define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
 183
 184static void dsmg600_power_handler(struct timer_list *unused);
 185static DEFINE_TIMER(dsmg600_power_timer, dsmg600_power_handler);
 186
 187static void dsmg600_power_handler(struct timer_list *unused)
 188{
 189        /* This routine is called twice per second to check the
 190         * state of the power button.
 191         */
 192
 193        if (gpio_get_value(DSMG600_PB_GPIO)) {
 194
 195                /* IO Pin is 1 (button pushed) */
 196                if (power_button_countdown > 0)
 197                        power_button_countdown--;
 198
 199        } else {
 200
 201                /* Done on button release, to allow for auto-power-on mods. */
 202                if (power_button_countdown == 0) {
 203                        /* Signal init to do the ctrlaltdel action,
 204                         * this will bypass init if it hasn't started
 205                         * and do a kernel_restart.
 206                         */
 207                        ctrl_alt_del();
 208
 209                        /* Change the state of the power LED to "blink" */
 210                        gpio_set_value(DSMG600_LED_PWR_GPIO, 0);
 211                } else {
 212                        power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 213                }
 214        }
 215
 216        mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
 217}
 218
 219static irqreturn_t dsmg600_reset_handler(int irq, void *dev_id)
 220{
 221        /* This is the paper-clip reset, it shuts the machine down directly. */
 222        machine_power_off();
 223
 224        return IRQ_HANDLED;
 225}
 226
 227static void __init dsmg600_timer_init(void)
 228{
 229    /* The xtal on this machine is non-standard. */
 230    ixp4xx_timer_freq = DSMG600_FREQ;
 231
 232    /* Call standard timer_init function. */
 233    ixp4xx_timer_init();
 234}
 235
 236static int __init dsmg600_gpio_init(void)
 237{
 238        if (!machine_is_dsmg600())
 239                return 0;
 240
 241        gpio_request(DSMG600_RB_GPIO, "reset button");
 242        if (request_irq(gpio_to_irq(DSMG600_RB_GPIO), &dsmg600_reset_handler,
 243                IRQF_TRIGGER_LOW, "DSM-G600 reset button", NULL) < 0) {
 244
 245                printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 246                        gpio_to_irq(DSMG600_RB_GPIO));
 247        }
 248
 249        /*
 250         * The power button on the D-Link DSM-G600 is on GPIO 15, but
 251         * it cannot handle interrupts on that GPIO line.  So we'll
 252         * have to poll it with a kernel timer.
 253         */
 254
 255        /* Make sure that the power button GPIO is set up as an input */
 256        gpio_request(DSMG600_PB_GPIO, "power button");
 257        gpio_direction_input(DSMG600_PB_GPIO);
 258        /* Request poweroff GPIO line */
 259        gpio_request(DSMG600_PO_GPIO, "power off button");
 260
 261        /* Set the initial value for the power button IRQ handler */
 262        power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 263
 264        mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
 265        return 0;
 266}
 267device_initcall(dsmg600_gpio_init);
 268
 269static void __init dsmg600_init(void)
 270{
 271        ixp4xx_sys_init();
 272
 273        dsmg600_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 274        dsmg600_flash_resource.end =
 275                IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 276
 277        gpiod_add_lookup_table(&dsmg600_i2c_gpiod_table);
 278        i2c_register_board_info(0, dsmg600_i2c_board_info,
 279                                ARRAY_SIZE(dsmg600_i2c_board_info));
 280
 281        /* The UART is required on the DSM-G600 (Redboot cannot use the
 282         * NIC) -- do it here so that it does *not* get removed if
 283         * platform_add_devices fails!
 284         */
 285        (void)platform_device_register(&dsmg600_uart);
 286
 287        platform_add_devices(dsmg600_devices, ARRAY_SIZE(dsmg600_devices));
 288
 289        pm_power_off = dsmg600_power_off;
 290}
 291
 292MACHINE_START(DSMG600, "D-Link DSM-G600 RevA")
 293        /* Maintainer: www.nslu2-linux.org */
 294        .atag_offset    = 0x100,
 295        .map_io         = ixp4xx_map_io,
 296        .init_early     = ixp4xx_init_early,
 297        .init_irq       = ixp4xx_init_irq,
 298        .init_time      = dsmg600_timer_init,
 299        .init_machine   = dsmg600_init,
 300#if defined(CONFIG_PCI)
 301        .dma_zone_size  = SZ_64M,
 302#endif
 303        .restart        = ixp4xx_restart,
 304MACHINE_END
 305