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/gpio/machine.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 gpiod_lookup_table nas100d_i2c_gpiod_table = {
 105         .dev_id         = "i2c-gpio",
 106         .table          = {
 107                 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SDA_PIN,
 108                                 NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
 109                 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SCL_PIN,
 110                                 NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
 111         },
 112 };
 113
 114 static struct platform_device nas100d_i2c_gpio = {
 115         .name                   = "i2c-gpio",
 116         .id                     = 0,
 117         .dev     = {
 118                 .platform_data  = NULL,
 119         },
 120 };
 121
 122 static struct resource nas100d_uart_resources[] = {
 123         {
 124                 .start          = IXP4XX_UART1_BASE_PHYS,
 125                 .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
 126                 .flags          = IORESOURCE_MEM,
 127         },
 128         {
 129                 .start          = IXP4XX_UART2_BASE_PHYS,
 130                 .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
 131                 .flags          = IORESOURCE_MEM,
 132         }
 133 };
 134
 135 static struct plat_serial8250_port nas100d_uart_data[] = {
 136         {
 137                 .mapbase        = IXP4XX_UART1_BASE_PHYS,
 138                 .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
 139                 .irq            = IRQ_IXP4XX_UART1,
 140                 .flags          = UPF_BOOT_AUTOCONF,
 141                 .iotype         = UPIO_MEM,
 142                 .regshift       = 2,
 143                 .uartclk        = IXP4XX_UART_XTAL,
 144         },
 145         {
 146                 .mapbase        = IXP4XX_UART2_BASE_PHYS,
 147                 .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 148                 .irq            = IRQ_IXP4XX_UART2,
 149                 .flags          = UPF_BOOT_AUTOCONF,
 150                 .iotype         = UPIO_MEM,
 151                 .regshift       = 2,
 152                 .uartclk        = IXP4XX_UART_XTAL,
 153         },
 154         { }
 155 };
 156
 157 static struct platform_device nas100d_uart = {
 158         .name                   = "serial8250",
 159         .id                     = PLAT8250_DEV_PLATFORM,
 160         .dev.platform_data      = nas100d_uart_data,
 161         .num_resources          = 2,
 162         .resource               = nas100d_uart_resources,
 163 };
 164
 165 /* Built-in 10/100 Ethernet MAC interfaces */
 166 static struct eth_plat_info nas100d_plat_eth[] = {
 167         {
 168                 .phy            = 0,
 169                 .rxq            = 3,
 170                 .txreadyq       = 20,
 171         }
 172 };
 173
 174 static struct platform_device nas100d_eth[] = {
 175         {
 176                 .name                   = "ixp4xx_eth",
 177                 .id                     = IXP4XX_ETH_NPEB,
 178                 .dev.platform_data      = nas100d_plat_eth,
 179         }
 180 };
 181
 182 static struct platform_device *nas100d_devices[] __initdata = {
 183         &nas100d_i2c_gpio,
 184         &nas100d_flash,
 185         &nas100d_leds,
 186         &nas100d_eth[0],
 187 };
 188
 189 static void nas100d_power_off(void)
 190 {
 191         /* This causes the box to drop the power and go dead. */
 192
 193         /* enable the pwr cntl gpio and assert power off */
 194         gpio_direction_output(NAS100D_PO_GPIO, 1);
 195 }
 196
 197 /* This is used to make sure the power-button pusher is serious.  The button
 198  * must be held until the value of this counter reaches zero.
 199  */
 200 static int power_button_countdown;
 201
 202 /* Must hold the button down for at least this many counts to be processed */
 203 #define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
 204
 205 static void nas100d_power_handler(struct timer_list *unused);
 206 static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler);
 207
 208 static void nas100d_power_handler(struct timer_list *unused)
 209 {
 210         /* This routine is called twice per second to check the
 211          * state of the power button.
 212          */
 213
 214         if (gpio_get_value(NAS100D_PB_GPIO)) {
 215
 216                 /* IO Pin is 1 (button pushed) */
 217                 if (power_button_countdown > 0)
 218                         power_button_countdown--;
 219
 220         } else {
 221
 222                 /* Done on button release, to allow for auto-power-on mods. */
 223                 if (power_button_countdown == 0) {
 224                         /* Signal init to do the ctrlaltdel action,
 225                          * this will bypass init if it hasn't started
 226                          * and do a kernel_restart.
 227                          */
 228                         ctrl_alt_del();
 229
 230                         /* Change the state of the power LED to "blink" */
 231                         gpio_set_value(NAS100D_LED_PWR_GPIO, 0);
 232                 } else {
 233                         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 234                 }
 235         }
 236
 237         mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
 238 }
 239
 240 static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
 241 {
 242         /* This is the paper-clip reset, it shuts the machine down directly. */
 243         machine_power_off();
 244
 245         return IRQ_HANDLED;
 246 }
 247
 248 static int __init nas100d_gpio_init(void)
 249 {
 250         if (!machine_is_nas100d())
 251                 return 0;
 252
 253         /*
 254          * The power button on the Iomega NAS100d is on GPIO 14, but
 255          * it cannot handle interrupts on that GPIO line.  So we'll
 256          * have to poll it with a kernel timer.
 257          */
 258
 259         /* Request the power off GPIO */
 260         gpio_request(NAS100D_PO_GPIO, "power off");
 261
 262         /* Make sure that the power button GPIO is set up as an input */
 263         gpio_request(NAS100D_PB_GPIO, "power button");
 264         gpio_direction_input(NAS100D_PB_GPIO);
 265
 266         /* Set the initial value for the power button IRQ handler */
 267         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 268
 269         mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
 270
 271         return 0;
 272 }
 273 device_initcall(nas100d_gpio_init);
 274
 275 static void __init nas100d_init(void)
 276 {
 277         uint8_t __iomem *f;
 278         int i;
 279
 280         ixp4xx_sys_init();
 281
 282         /* gpio 14 and 15 are _not_ clocks */
 283         *IXP4XX_GPIO_GPCLKR = 0;
 284
 285         nas100d_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 286         nas100d_flash_resource.end =
 287                 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 288
 289         gpiod_add_lookup_table(&nas100d_i2c_gpiod_table);
 290         i2c_register_board_info(0, nas100d_i2c_board_info,
 291                                 ARRAY_SIZE(nas100d_i2c_board_info));
 292
 293         /*
 294          * This is only useful on a modified machine, but it is valuable
 295          * to have it first in order to see debug messages, and so that
 296          * it does *not* get removed if platform_add_devices fails!
 297          */
 298         (void)platform_device_register(&nas100d_uart);
 299
 300         platform_add_devices(nas100d_devices, ARRAY_SIZE(nas100d_devices));
 301
 302         pm_power_off = nas100d_power_off;
 303
 304         if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler,
 305                 IRQF_TRIGGER_LOW, "NAS100D reset button", NULL) < 0) {
 306
 307                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 308                         gpio_to_irq(NAS100D_RB_GPIO));
 309         }
 310
 311         /*
 312          * Map in a portion of the flash and read the MAC address.
 313          * Since it is stored in BE in the flash itself, we need to
 314          * byteswap it if we're in LE mode.
 315          */
 316         f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x1000000);
 317         if (f) {
 318                 for (i = 0; i < 6; i++)
 319 #ifdef __ARMEB__
 320                         nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + i);
 321 #else
 322                         nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + (i^3));
 323 #endif
 324                 iounmap(f);
 325         }
 326         printk(KERN_INFO "NAS100D: Using MAC address %pM for port 0\n",
 327                nas100d_plat_eth[0].hwaddr);
 328
 329 }
 330
 331 MACHINE_START(NAS100D, "Iomega NAS 100d")
 332         /* Maintainer: www.nslu2-linux.org */
 333         .atag_offset    = 0x100,
 334         .map_io         = ixp4xx_map_io,
 335         .init_early     = ixp4xx_init_early,
 336         .init_irq       = ixp4xx_init_irq,
 337         .init_time      = ixp4xx_timer_init,
 338         .init_machine   = nas100d_init,
 339 #if defined(CONFIG_PCI)
 340         .dma_zone_size  = SZ_64M,
 341 #endif
 342         .restart        = ixp4xx_restart,
 343 MACHINE_END