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
  57 static struct flash_platform_data dsmg600_flash_data = {
  58         .map_name               = "cfi_probe",
  59         .width                  = 2,
  60 };
  61
  62 static struct resource dsmg600_flash_resource = {
  63         .flags                  = IORESOURCE_MEM,
  64 };
  65
  66 static 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
  74 static 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
  84 static struct platform_device dsmg600_i2c_gpio = {
  85         .name                   = "i2c-gpio",
  86         .id                     = 0,
  87         .dev     = {
  88                 .platform_data  = NULL,
  89         },
  90 };
  91
  92 static struct i2c_board_info __initdata dsmg600_i2c_board_info [] = {
  93         {
  94                 I2C_BOARD_INFO("pcf8563", 0x51),
  95         },
  96 };
  97
  98 static 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
 110 static struct gpio_led_platform_data dsmg600_led_data = {
 111         .num_leds               = ARRAY_SIZE(dsmg600_led_pins),
 112         .leds                   = dsmg600_led_pins,
 113 };
 114
 115 static struct platform_device dsmg600_leds = {
 116         .name                   = "leds-gpio",
 117         .id                     = -1,
 118         .dev.platform_data      = &dsmg600_led_data,
 119 };
 120
 121 static 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
 134 static 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
 156 static 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
 164 static struct platform_device *dsmg600_devices[] __initdata = {
 165         &dsmg600_i2c_gpio,
 166         &dsmg600_flash,
 167         &dsmg600_leds,
 168 };
 169
 170 static 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  */
 179 static 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
 184 static void dsmg600_power_handler(struct timer_list *unused);
 185 static DEFINE_TIMER(dsmg600_power_timer, dsmg600_power_handler);
 186
 187 static 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
 219 static 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
 227 static 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
 236 static 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 }
 267 device_initcall(dsmg600_gpio_init);
 268
 269 static void __init dsmg600_init(void)
 270 {
 271         ixp4xx_sys_init();
 272
 273         /* Make sure that GPIO14 and GPIO15 are not used as clocks */
 274         *IXP4XX_GPIO_GPCLKR = 0;
 275
 276         dsmg600_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 277         dsmg600_flash_resource.end =
 278                 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 279
 280         gpiod_add_lookup_table(&dsmg600_i2c_gpiod_table);
 281         i2c_register_board_info(0, dsmg600_i2c_board_info,
 282                                 ARRAY_SIZE(dsmg600_i2c_board_info));
 283
 284         /* The UART is required on the DSM-G600 (Redboot cannot use the
 285          * NIC) -- do it here so that it does *not* get removed if
 286          * platform_add_devices fails!
 287          */
 288         (void)platform_device_register(&dsmg600_uart);
 289
 290         platform_add_devices(dsmg600_devices, ARRAY_SIZE(dsmg600_devices));
 291
 292         pm_power_off = dsmg600_power_off;
 293 }
 294
 295 MACHINE_START(DSMG600, "D-Link DSM-G600 RevA")
 296         /* Maintainer: www.nslu2-linux.org */
 297         .atag_offset    = 0x100,
 298         .map_io         = ixp4xx_map_io,
 299         .init_early     = ixp4xx_init_early,
 300         .init_irq       = ixp4xx_init_irq,
 301         .init_time      = dsmg600_timer_init,
 302         .init_machine   = dsmg600_init,
 303 #if defined(CONFIG_PCI)
 304         .dma_zone_size  = SZ_64M,
 305 #endif
 306         .restart        = ixp4xx_restart,
 307 MACHINE_END