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 #define DSMG600_SDA_PIN         5
  39 #define DSMG600_SCL_PIN         4
  40
  41 /* DSM-G600 Timer Setting */
  42 #define DSMG600_FREQ            66000000
  43
  44 /* Buttons */
  45 #define DSMG600_PB_GPIO         15      /* power button */
  46 #define DSMG600_RB_GPIO         3       /* reset button */
  47
  48 /* Power control */
  49 #define DSMG600_PO_GPIO         2       /* power off */
  50
  51 /* LEDs */
  52 #define DSMG600_LED_PWR_GPIO    0
  53 #define DSMG600_LED_WLAN_GPIO   14
  54
  55 static struct flash_platform_data dsmg600_flash_data = {
  56         .map_name               = "cfi_probe",
  57         .width                  = 2,
  58 };
  59
  60 static struct resource dsmg600_flash_resource = {
  61         .flags                  = IORESOURCE_MEM,
  62 };
  63
  64 static struct platform_device dsmg600_flash = {
  65         .name                   = "IXP4XX-Flash",
  66         .id                     = 0,
  67         .dev.platform_data      = &dsmg600_flash_data,
  68         .num_resources          = 1,
  69         .resource               = &dsmg600_flash_resource,
  70 };
  71
  72 static struct gpiod_lookup_table dsmg600_i2c_gpiod_table = {
  73         .dev_id         = "i2c-gpio",
  74         .table          = {
  75                 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SDA_PIN,
  76                                 NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
  77                 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", DSMG600_SCL_PIN,
  78                                 NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
  79         },
  80 };
  81
  82 static struct platform_device dsmg600_i2c_gpio = {
  83         .name                   = "i2c-gpio",
  84         .id                     = 0,
  85         .dev     = {
  86                 .platform_data  = NULL,
  87         },
  88 };
  89
  90 static struct i2c_board_info __initdata dsmg600_i2c_board_info [] = {
  91         {
  92                 I2C_BOARD_INFO("pcf8563", 0x51),
  93         },
  94 };
  95
  96 static struct gpio_led dsmg600_led_pins[] = {
  97         {
  98                 .name           = "dsmg600:green:power",
  99                 .gpio           = DSMG600_LED_PWR_GPIO,
 100         },
 101         {
 102                 .name           = "dsmg600:green:wlan",
 103                 .gpio           = DSMG600_LED_WLAN_GPIO,
 104                 .active_low     = true,
 105         },
 106 };
 107
 108 static struct gpio_led_platform_data dsmg600_led_data = {
 109         .num_leds               = ARRAY_SIZE(dsmg600_led_pins),
 110         .leds                   = dsmg600_led_pins,
 111 };
 112
 113 static struct platform_device dsmg600_leds = {
 114         .name                   = "leds-gpio",
 115         .id                     = -1,
 116         .dev.platform_data      = &dsmg600_led_data,
 117 };
 118
 119 static struct resource dsmg600_uart_resources[] = {
 120         {
 121                 .start          = IXP4XX_UART1_BASE_PHYS,
 122                 .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
 123                 .flags          = IORESOURCE_MEM,
 124         },
 125         {
 126                 .start          = IXP4XX_UART2_BASE_PHYS,
 127                 .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
 128                 .flags          = IORESOURCE_MEM,
 129         }
 130 };
 131
 132 static struct plat_serial8250_port dsmg600_uart_data[] = {
 133         {
 134                 .mapbase        = IXP4XX_UART1_BASE_PHYS,
 135                 .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
 136                 .irq            = IRQ_IXP4XX_UART1,
 137                 .flags          = UPF_BOOT_AUTOCONF,
 138                 .iotype         = UPIO_MEM,
 139                 .regshift       = 2,
 140                 .uartclk        = IXP4XX_UART_XTAL,
 141         },
 142         {
 143                 .mapbase        = IXP4XX_UART2_BASE_PHYS,
 144                 .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 145                 .irq            = IRQ_IXP4XX_UART2,
 146                 .flags          = UPF_BOOT_AUTOCONF,
 147                 .iotype         = UPIO_MEM,
 148                 .regshift       = 2,
 149                 .uartclk        = IXP4XX_UART_XTAL,
 150         },
 151         { }
 152 };
 153
 154 static struct platform_device dsmg600_uart = {
 155         .name                   = "serial8250",
 156         .id                     = PLAT8250_DEV_PLATFORM,
 157         .dev.platform_data      = dsmg600_uart_data,
 158         .num_resources          = ARRAY_SIZE(dsmg600_uart_resources),
 159         .resource               = dsmg600_uart_resources,
 160 };
 161
 162 static struct platform_device *dsmg600_devices[] __initdata = {
 163         &dsmg600_i2c_gpio,
 164         &dsmg600_flash,
 165         &dsmg600_leds,
 166 };
 167
 168 static void dsmg600_power_off(void)
 169 {
 170         /* enable the pwr cntl and drive it high */
 171         gpio_direction_output(DSMG600_PO_GPIO, 1);
 172 }
 173
 174 /* This is used to make sure the power-button pusher is serious.  The button
 175  * must be held until the value of this counter reaches zero.
 176  */
 177 static int power_button_countdown;
 178
 179 /* Must hold the button down for at least this many counts to be processed */
 180 #define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
 181
 182 static void dsmg600_power_handler(struct timer_list *unused);
 183 static DEFINE_TIMER(dsmg600_power_timer, dsmg600_power_handler);
 184
 185 static void dsmg600_power_handler(struct timer_list *unused)
 186 {
 187         /* This routine is called twice per second to check the
 188          * state of the power button.
 189          */
 190
 191         if (gpio_get_value(DSMG600_PB_GPIO)) {
 192
 193                 /* IO Pin is 1 (button pushed) */
 194                 if (power_button_countdown > 0)
 195                         power_button_countdown--;
 196
 197         } else {
 198
 199                 /* Done on button release, to allow for auto-power-on mods. */
 200                 if (power_button_countdown == 0) {
 201                         /* Signal init to do the ctrlaltdel action,
 202                          * this will bypass init if it hasn't started
 203                          * and do a kernel_restart.
 204                          */
 205                         ctrl_alt_del();
 206
 207                         /* Change the state of the power LED to "blink" */
 208                         gpio_set_value(DSMG600_LED_PWR_GPIO, 0);
 209                 } else {
 210                         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 211                 }
 212         }
 213
 214         mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
 215 }
 216
 217 static irqreturn_t dsmg600_reset_handler(int irq, void *dev_id)
 218 {
 219         /* This is the paper-clip reset, it shuts the machine down directly. */
 220         machine_power_off();
 221
 222         return IRQ_HANDLED;
 223 }
 224
 225 static void __init dsmg600_timer_init(void)
 226 {
 227     /* The xtal on this machine is non-standard. */
 228     ixp4xx_timer_freq = DSMG600_FREQ;
 229
 230     /* Call standard timer_init function. */
 231     ixp4xx_timer_init();
 232 }
 233
 234 static int __init dsmg600_gpio_init(void)
 235 {
 236         if (!machine_is_dsmg600())
 237                 return 0;
 238
 239         gpio_request(DSMG600_RB_GPIO, "reset button");
 240         if (request_irq(gpio_to_irq(DSMG600_RB_GPIO), &dsmg600_reset_handler,
 241                 IRQF_TRIGGER_LOW, "DSM-G600 reset button", NULL) < 0) {
 242
 243                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 244                         gpio_to_irq(DSMG600_RB_GPIO));
 245         }
 246
 247         /*
 248          * The power button on the D-Link DSM-G600 is on GPIO 15, but
 249          * it cannot handle interrupts on that GPIO line.  So we'll
 250          * have to poll it with a kernel timer.
 251          */
 252
 253         /* Make sure that the power button GPIO is set up as an input */
 254         gpio_request(DSMG600_PB_GPIO, "power button");
 255         gpio_direction_input(DSMG600_PB_GPIO);
 256         /* Request poweroff GPIO line */
 257         gpio_request(DSMG600_PO_GPIO, "power off button");
 258
 259         /* Set the initial value for the power button IRQ handler */
 260         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 261
 262         mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
 263         return 0;
 264 }
 265 device_initcall(dsmg600_gpio_init);
 266
 267 static void __init dsmg600_init(void)
 268 {
 269         ixp4xx_sys_init();
 270
 271         /* Make sure that GPIO14 and GPIO15 are not used as clocks */
 272         *IXP4XX_GPIO_GPCLKR = 0;
 273
 274         dsmg600_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 275         dsmg600_flash_resource.end =
 276                 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 277
 278         gpiod_add_lookup_table(&dsmg600_i2c_gpiod_table);
 279         i2c_register_board_info(0, dsmg600_i2c_board_info,
 280                                 ARRAY_SIZE(dsmg600_i2c_board_info));
 281
 282         /* The UART is required on the DSM-G600 (Redboot cannot use the
 283          * NIC) -- do it here so that it does *not* get removed if
 284          * platform_add_devices fails!
 285          */
 286         (void)platform_device_register(&dsmg600_uart);
 287
 288         platform_add_devices(dsmg600_devices, ARRAY_SIZE(dsmg600_devices));
 289
 290         pm_power_off = dsmg600_power_off;
 291 }
 292
 293 MACHINE_START(DSMG600, "D-Link DSM-G600 RevA")
 294         /* Maintainer: www.nslu2-linux.org */
 295         .atag_offset    = 0x100,
 296         .map_io         = ixp4xx_map_io,
 297         .init_early     = ixp4xx_init_early,
 298         .init_irq       = ixp4xx_init_irq,
 299         .init_time      = dsmg600_timer_init,
 300         .init_machine   = dsmg600_init,
 301 #if defined(CONFIG_PCI)
 302         .dma_zone_size  = SZ_64M,
 303 #endif
 304         .restart        = ixp4xx_restart,
 305 MACHINE_END