arch/arm/mach-ixp4xx/nas100d-setup.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/arm/mach-ixp4xx/nas100d-setup.c
   4  *
   5  * NAS 100d board-setup
   6  *
   7  * Copyright (C) 2008 Rod Whitby <rod@whitby.id.au>
   8  *
   9  * based on ixdp425-setup.c:
  10  *      Copyright (C) 2003-2004 MontaVista Software, Inc.
  11  * based on nas100d-power.c:
  12  *      Copyright (C) 2005 Tower Technologies
  13  * based on nas100d-io.c
  14  *      Copyright (C) 2004 Karen Spearel
  15  *
  16  * Author: Alessandro Zummo <a.zummo@towertech.it>
  17  * Author: Rod Whitby <rod@whitby.id.au>
  18  * Maintainers: http://www.nslu2-linux.org/
  19  *
  20  */
  21 #include <linux/gpio.h>
  22 #include <linux/if_ether.h>
  23 #include <linux/irq.h>
  24 #include <linux/jiffies.h>
  25 #include <linux/timer.h>
  26 #include <linux/serial.h>
  27 #include <linux/serial_8250.h>
  28 #include <linux/leds.h>
  29 #include <linux/reboot.h>
  30 #include <linux/i2c.h>
  31 #include <linux/i2c-gpio.h>
  32 #include <linux/io.h>
  33 #include <asm/mach-types.h>
  34 #include <asm/mach/arch.h>
  35 #include <asm/mach/flash.h>
  36
  37 #define NAS100D_SDA_PIN         5
  38 #define NAS100D_SCL_PIN         6
  39
  40 /* Buttons */
  41 #define NAS100D_PB_GPIO         14   /* power button */
  42 #define NAS100D_RB_GPIO         4    /* reset button */
  43
  44 /* Power control */
  45 #define NAS100D_PO_GPIO         12   /* power off */
  46
  47 /* LEDs */
  48 #define NAS100D_LED_WLAN_GPIO   0
  49 #define NAS100D_LED_DISK_GPIO   3
  50 #define NAS100D_LED_PWR_GPIO    15
  51
  52 static struct flash_platform_data nas100d_flash_data = {
  53         .map_name               = "cfi_probe",
  54         .width                  = 2,
  55 };
  56
  57 static struct resource nas100d_flash_resource = {
  58         .flags                  = IORESOURCE_MEM,
  59 };
  60
  61 static struct platform_device nas100d_flash = {
  62         .name                   = "IXP4XX-Flash",
  63         .id                     = 0,
  64         .dev.platform_data      = &nas100d_flash_data,
  65         .num_resources          = 1,
  66         .resource               = &nas100d_flash_resource,
  67 };
  68
  69 static struct i2c_board_info __initdata nas100d_i2c_board_info [] = {
  70         {
  71                 I2C_BOARD_INFO("pcf8563", 0x51),
  72         },
  73 };
  74
  75 static struct gpio_led nas100d_led_pins[] = {
  76         {
  77                 .name           = "nas100d:green:wlan",
  78                 .gpio           = NAS100D_LED_WLAN_GPIO,
  79                 .active_low     = true,
  80         },
  81         {
  82                 .name           = "nas100d:blue:power",  /* (off=flashing) */
  83                 .gpio           = NAS100D_LED_PWR_GPIO,
  84                 .active_low     = true,
  85         },
  86         {
  87                 .name           = "nas100d:yellow:disk",
  88                 .gpio           = NAS100D_LED_DISK_GPIO,
  89                 .active_low     = true,
  90         },
  91 };
  92
  93 static struct gpio_led_platform_data nas100d_led_data = {
  94         .num_leds               = ARRAY_SIZE(nas100d_led_pins),
  95         .leds                   = nas100d_led_pins,
  96 };
  97
  98 static struct platform_device nas100d_leds = {
  99         .name                   = "leds-gpio",
 100         .id                     = -1,
 101         .dev.platform_data      = &nas100d_led_data,
 102 };
 103
 104 static struct i2c_gpio_platform_data nas100d_i2c_gpio_data = {
 105         .sda_pin                = NAS100D_SDA_PIN,
 106         .scl_pin                = NAS100D_SCL_PIN,
 107 };
 108
 109 static struct platform_device nas100d_i2c_gpio = {
 110         .name                   = "i2c-gpio",
 111         .id                     = 0,
 112         .dev     = {
 113                 .platform_data  = &nas100d_i2c_gpio_data,
 114         },
 115 };
 116
 117 static struct resource nas100d_uart_resources[] = {
 118         {
 119                 .start          = IXP4XX_UART1_BASE_PHYS,
 120                 .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
 121                 .flags          = IORESOURCE_MEM,
 122         },
 123         {
 124                 .start          = IXP4XX_UART2_BASE_PHYS,
 125                 .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
 126                 .flags          = IORESOURCE_MEM,
 127         }
 128 };
 129
 130 static struct plat_serial8250_port nas100d_uart_data[] = {
 131         {
 132                 .mapbase        = IXP4XX_UART1_BASE_PHYS,
 133                 .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
 134                 .irq            = IRQ_IXP4XX_UART1,
 135                 .flags          = UPF_BOOT_AUTOCONF,
 136                 .iotype         = UPIO_MEM,
 137                 .regshift       = 2,
 138                 .uartclk        = IXP4XX_UART_XTAL,
 139         },
 140         {
 141                 .mapbase        = IXP4XX_UART2_BASE_PHYS,
 142                 .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 143                 .irq            = IRQ_IXP4XX_UART2,
 144                 .flags          = UPF_BOOT_AUTOCONF,
 145                 .iotype         = UPIO_MEM,
 146                 .regshift       = 2,
 147                 .uartclk        = IXP4XX_UART_XTAL,
 148         },
 149         { }
 150 };
 151
 152 static struct platform_device nas100d_uart = {
 153         .name                   = "serial8250",
 154         .id                     = PLAT8250_DEV_PLATFORM,
 155         .dev.platform_data      = nas100d_uart_data,
 156         .num_resources          = 2,
 157         .resource               = nas100d_uart_resources,
 158 };
 159
 160 /* Built-in 10/100 Ethernet MAC interfaces */
 161 static struct eth_plat_info nas100d_plat_eth[] = {
 162         {
 163                 .phy            = 0,
 164                 .rxq            = 3,
 165                 .txreadyq       = 20,
 166         }
 167 };
 168
 169 static struct platform_device nas100d_eth[] = {
 170         {
 171                 .name                   = "ixp4xx_eth",
 172                 .id                     = IXP4XX_ETH_NPEB,
 173                 .dev.platform_data      = nas100d_plat_eth,
 174         }
 175 };
 176
 177 static struct platform_device *nas100d_devices[] __initdata = {
 178         &nas100d_i2c_gpio,
 179         &nas100d_flash,
 180         &nas100d_leds,
 181         &nas100d_eth[0],
 182 };
 183
 184 static void nas100d_power_off(void)
 185 {
 186         /* This causes the box to drop the power and go dead. */
 187
 188         /* enable the pwr cntl gpio and assert power off */
 189         gpio_direction_output(NAS100D_PO_GPIO, 1);
 190 }
 191
 192 /* This is used to make sure the power-button pusher is serious.  The button
 193  * must be held until the value of this counter reaches zero.
 194  */
 195 static int power_button_countdown;
 196
 197 /* Must hold the button down for at least this many counts to be processed */
 198 #define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
 199
 200 static void nas100d_power_handler(unsigned long data);
 201 static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler, 0, 0);
 202
 203 static void nas100d_power_handler(unsigned long data)
 204 {
 205         /* This routine is called twice per second to check the
 206          * state of the power button.
 207          */
 208
 209         if (gpio_get_value(NAS100D_PB_GPIO)) {
 210
 211                 /* IO Pin is 1 (button pushed) */
 212                 if (power_button_countdown > 0)
 213                         power_button_countdown--;
 214
 215         } else {
 216
 217                 /* Done on button release, to allow for auto-power-on mods. */
 218                 if (power_button_countdown == 0) {
 219                         /* Signal init to do the ctrlaltdel action,
 220                          * this will bypass init if it hasn't started
 221                          * and do a kernel_restart.
 222                          */
 223                         ctrl_alt_del();
 224
 225                         /* Change the state of the power LED to "blink" */
 226                         gpio_set_value(NAS100D_LED_PWR_GPIO, 0);
 227                 } else {
 228                         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 229                 }
 230         }
 231
 232         mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
 233 }
 234
 235 static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
 236 {
 237         /* This is the paper-clip reset, it shuts the machine down directly. */
 238         machine_power_off();
 239
 240         return IRQ_HANDLED;
 241 }
 242
 243 static int __init nas100d_gpio_init(void)
 244 {
 245         if (!machine_is_nas100d())
 246                 return 0;
 247
 248         /*
 249          * The power button on the Iomega NAS100d is on GPIO 14, but
 250          * it cannot handle interrupts on that GPIO line.  So we'll
 251          * have to poll it with a kernel timer.
 252          */
 253
 254         /* Request the power off GPIO */
 255         gpio_request(NAS100D_PO_GPIO, "power off");
 256
 257         /* Make sure that the power button GPIO is set up as an input */
 258         gpio_request(NAS100D_PB_GPIO, "power button");
 259         gpio_direction_input(NAS100D_PB_GPIO);
 260
 261         /* Set the initial value for the power button IRQ handler */
 262         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 263
 264         mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
 265
 266         return 0;
 267 }
 268 device_initcall(nas100d_gpio_init);
 269
 270 static void __init nas100d_init(void)
 271 {
 272         uint8_t __iomem *f;
 273         int i;
 274
 275         ixp4xx_sys_init();
 276
 277         /* gpio 14 and 15 are _not_ clocks */
 278         *IXP4XX_GPIO_GPCLKR = 0;
 279
 280         nas100d_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 281         nas100d_flash_resource.end =
 282                 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 283
 284         i2c_register_board_info(0, nas100d_i2c_board_info,
 285                                 ARRAY_SIZE(nas100d_i2c_board_info));
 286
 287         /*
 288          * This is only useful on a modified machine, but it is valuable
 289          * to have it first in order to see debug messages, and so that
 290          * it does *not* get removed if platform_add_devices fails!
 291          */
 292         (void)platform_device_register(&nas100d_uart);
 293
 294         platform_add_devices(nas100d_devices, ARRAY_SIZE(nas100d_devices));
 295
 296         pm_power_off = nas100d_power_off;
 297
 298         if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler,
 299                 IRQF_TRIGGER_LOW, "NAS100D reset button", NULL) < 0) {
 300
 301                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 302                         gpio_to_irq(NAS100D_RB_GPIO));
 303         }
 304
 305         /*
 306          * Map in a portion of the flash and read the MAC address.
 307          * Since it is stored in BE in the flash itself, we need to
 308          * byteswap it if we're in LE mode.
 309          */
 310         f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x1000000);
 311         if (f) {
 312                 for (i = 0; i < 6; i++)
 313 #ifdef __ARMEB__
 314                         nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + i);
 315 #else
 316                         nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + (i^3));
 317 #endif
 318                 iounmap(f);
 319         }
 320         printk(KERN_INFO "NAS100D: Using MAC address %pM for port 0\n",
 321                nas100d_plat_eth[0].hwaddr);
 322
 323 }
 324
 325 MACHINE_START(NAS100D, "Iomega NAS 100d")
 326         /* Maintainer: www.nslu2-linux.org */
 327         .atag_offset    = 0x100,
 328         .map_io         = ixp4xx_map_io,
 329         .init_early     = ixp4xx_init_early,
 330         .init_irq       = ixp4xx_init_irq,
 331         .init_time      = ixp4xx_timer_init,
 332         .init_machine   = nas100d_init,
 333 #if defined(CONFIG_PCI)
 334         .dma_zone_size  = SZ_64M,
 335 #endif
 336         .restart        = ixp4xx_restart,
 337 MACHINE_END