linux/arch/arm/mach-ixp4xx/nas100d-setup.c
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   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#include "irqs.h"
  38
  39#define NAS100D_SDA_PIN         5
  40#define NAS100D_SCL_PIN         6
  41
  42/* Buttons */
  43#define NAS100D_PB_GPIO         14   /* power button */
  44#define NAS100D_RB_GPIO         4    /* reset button */
  45
  46/* Power control */
  47#define NAS100D_PO_GPIO         12   /* power off */
  48
  49/* LEDs */
  50#define NAS100D_LED_WLAN_GPIO   0
  51#define NAS100D_LED_DISK_GPIO   3
  52#define NAS100D_LED_PWR_GPIO    15
  53
  54static struct flash_platform_data nas100d_flash_data = {
  55        .map_name               = "cfi_probe",
  56        .width                  = 2,
  57};
  58
  59static struct resource nas100d_flash_resource = {
  60        .flags                  = IORESOURCE_MEM,
  61};
  62
  63static struct platform_device nas100d_flash = {
  64        .name                   = "IXP4XX-Flash",
  65        .id                     = 0,
  66        .dev.platform_data      = &nas100d_flash_data,
  67        .num_resources          = 1,
  68        .resource               = &nas100d_flash_resource,
  69};
  70
  71static struct i2c_board_info __initdata nas100d_i2c_board_info [] = {
  72        {
  73                I2C_BOARD_INFO("pcf8563", 0x51),
  74        },
  75};
  76
  77static struct gpio_led nas100d_led_pins[] = {
  78        {
  79                .name           = "nas100d:green:wlan",
  80                .gpio           = NAS100D_LED_WLAN_GPIO,
  81                .active_low     = true,
  82        },
  83        {
  84                .name           = "nas100d:blue:power",  /* (off=flashing) */
  85                .gpio           = NAS100D_LED_PWR_GPIO,
  86                .active_low     = true,
  87        },
  88        {
  89                .name           = "nas100d:yellow:disk",
  90                .gpio           = NAS100D_LED_DISK_GPIO,
  91                .active_low     = true,
  92        },
  93};
  94
  95static struct gpio_led_platform_data nas100d_led_data = {
  96        .num_leds               = ARRAY_SIZE(nas100d_led_pins),
  97        .leds                   = nas100d_led_pins,
  98};
  99
 100static struct platform_device nas100d_leds = {
 101        .name                   = "leds-gpio",
 102        .id                     = -1,
 103        .dev.platform_data      = &nas100d_led_data,
 104};
 105
 106static struct gpiod_lookup_table nas100d_i2c_gpiod_table = {
 107        .dev_id         = "i2c-gpio.0",
 108        .table          = {
 109                GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SDA_PIN,
 110                                NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
 111                GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SCL_PIN,
 112                                NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
 113        },
 114};
 115
 116static struct platform_device nas100d_i2c_gpio = {
 117        .name                   = "i2c-gpio",
 118        .id                     = 0,
 119        .dev     = {
 120                .platform_data  = NULL,
 121        },
 122};
 123
 124static struct resource nas100d_uart_resources[] = {
 125        {
 126                .start          = IXP4XX_UART1_BASE_PHYS,
 127                .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
 128                .flags          = IORESOURCE_MEM,
 129        },
 130        {
 131                .start          = IXP4XX_UART2_BASE_PHYS,
 132                .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
 133                .flags          = IORESOURCE_MEM,
 134        }
 135};
 136
 137static struct plat_serial8250_port nas100d_uart_data[] = {
 138        {
 139                .mapbase        = IXP4XX_UART1_BASE_PHYS,
 140                .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
 141                .irq            = IRQ_IXP4XX_UART1,
 142                .flags          = UPF_BOOT_AUTOCONF,
 143                .iotype         = UPIO_MEM,
 144                .regshift       = 2,
 145                .uartclk        = IXP4XX_UART_XTAL,
 146        },
 147        {
 148                .mapbase        = IXP4XX_UART2_BASE_PHYS,
 149                .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 150                .irq            = IRQ_IXP4XX_UART2,
 151                .flags          = UPF_BOOT_AUTOCONF,
 152                .iotype         = UPIO_MEM,
 153                .regshift       = 2,
 154                .uartclk        = IXP4XX_UART_XTAL,
 155        },
 156        { }
 157};
 158
 159static struct platform_device nas100d_uart = {
 160        .name                   = "serial8250",
 161        .id                     = PLAT8250_DEV_PLATFORM,
 162        .dev.platform_data      = nas100d_uart_data,
 163        .num_resources          = 2,
 164        .resource               = nas100d_uart_resources,
 165};
 166
 167/* Built-in 10/100 Ethernet MAC interfaces */
 168static struct resource nas100d_eth_resources[] = {
 169        {
 170                .start          = IXP4XX_EthB_BASE_PHYS,
 171                .end            = IXP4XX_EthB_BASE_PHYS + 0x0fff,
 172                .flags          = IORESOURCE_MEM,
 173        },
 174};
 175
 176static struct eth_plat_info nas100d_plat_eth[] = {
 177        {
 178                .phy            = 0,
 179                .rxq            = 3,
 180                .txreadyq       = 20,
 181        }
 182};
 183
 184static struct platform_device nas100d_eth[] = {
 185        {
 186                .name                   = "ixp4xx_eth",
 187                .id                     = IXP4XX_ETH_NPEB,
 188                .dev.platform_data      = nas100d_plat_eth,
 189                .num_resources          = ARRAY_SIZE(nas100d_eth_resources),
 190                .resource               = nas100d_eth_resources,
 191        }
 192};
 193
 194static struct platform_device *nas100d_devices[] __initdata = {
 195        &nas100d_i2c_gpio,
 196        &nas100d_flash,
 197        &nas100d_leds,
 198        &nas100d_eth[0],
 199};
 200
 201static void nas100d_power_off(void)
 202{
 203        /* This causes the box to drop the power and go dead. */
 204
 205        /* enable the pwr cntl gpio and assert power off */
 206        gpio_direction_output(NAS100D_PO_GPIO, 1);
 207}
 208
 209/* This is used to make sure the power-button pusher is serious.  The button
 210 * must be held until the value of this counter reaches zero.
 211 */
 212static int power_button_countdown;
 213
 214/* Must hold the button down for at least this many counts to be processed */
 215#define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
 216
 217static void nas100d_power_handler(struct timer_list *unused);
 218static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler);
 219
 220static void nas100d_power_handler(struct timer_list *unused)
 221{
 222        /* This routine is called twice per second to check the
 223         * state of the power button.
 224         */
 225
 226        if (gpio_get_value(NAS100D_PB_GPIO)) {
 227
 228                /* IO Pin is 1 (button pushed) */
 229                if (power_button_countdown > 0)
 230                        power_button_countdown--;
 231
 232        } else {
 233
 234                /* Done on button release, to allow for auto-power-on mods. */
 235                if (power_button_countdown == 0) {
 236                        /* Signal init to do the ctrlaltdel action,
 237                         * this will bypass init if it hasn't started
 238                         * and do a kernel_restart.
 239                         */
 240                        ctrl_alt_del();
 241
 242                        /* Change the state of the power LED to "blink" */
 243                        gpio_set_value(NAS100D_LED_PWR_GPIO, 0);
 244                } else {
 245                        power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 246                }
 247        }
 248
 249        mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
 250}
 251
 252static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
 253{
 254        /* This is the paper-clip reset, it shuts the machine down directly. */
 255        machine_power_off();
 256
 257        return IRQ_HANDLED;
 258}
 259
 260static int __init nas100d_gpio_init(void)
 261{
 262        if (!machine_is_nas100d())
 263                return 0;
 264
 265        /*
 266         * The power button on the Iomega NAS100d is on GPIO 14, but
 267         * it cannot handle interrupts on that GPIO line.  So we'll
 268         * have to poll it with a kernel timer.
 269         */
 270
 271        /* Request the power off GPIO */
 272        gpio_request(NAS100D_PO_GPIO, "power off");
 273
 274        /* Make sure that the power button GPIO is set up as an input */
 275        gpio_request(NAS100D_PB_GPIO, "power button");
 276        gpio_direction_input(NAS100D_PB_GPIO);
 277
 278        /* Set the initial value for the power button IRQ handler */
 279        power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 280
 281        mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
 282
 283        return 0;
 284}
 285device_initcall(nas100d_gpio_init);
 286
 287static void __init nas100d_init(void)
 288{
 289        uint8_t __iomem *f;
 290        int i;
 291
 292        ixp4xx_sys_init();
 293
 294        nas100d_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 295        nas100d_flash_resource.end =
 296                IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 297
 298        gpiod_add_lookup_table(&nas100d_i2c_gpiod_table);
 299        i2c_register_board_info(0, nas100d_i2c_board_info,
 300                                ARRAY_SIZE(nas100d_i2c_board_info));
 301
 302        /*
 303         * This is only useful on a modified machine, but it is valuable
 304         * to have it first in order to see debug messages, and so that
 305         * it does *not* get removed if platform_add_devices fails!
 306         */
 307        (void)platform_device_register(&nas100d_uart);
 308
 309        platform_add_devices(nas100d_devices, ARRAY_SIZE(nas100d_devices));
 310
 311        pm_power_off = nas100d_power_off;
 312
 313        if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler,
 314                IRQF_TRIGGER_LOW, "NAS100D reset button", NULL) < 0) {
 315
 316                printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 317                        gpio_to_irq(NAS100D_RB_GPIO));
 318        }
 319
 320        /*
 321         * Map in a portion of the flash and read the MAC address.
 322         * Since it is stored in BE in the flash itself, we need to
 323         * byteswap it if we're in LE mode.
 324         */
 325        f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x1000000);
 326        if (f) {
 327                for (i = 0; i < 6; i++)
 328#ifdef __ARMEB__
 329                        nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + i);
 330#else
 331                        nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + (i^3));
 332#endif
 333                iounmap(f);
 334        }
 335        printk(KERN_INFO "NAS100D: Using MAC address %pM for port 0\n",
 336               nas100d_plat_eth[0].hwaddr);
 337
 338}
 339
 340MACHINE_START(NAS100D, "Iomega NAS 100d")
 341        /* Maintainer: www.nslu2-linux.org */
 342        .atag_offset    = 0x100,
 343        .map_io         = ixp4xx_map_io,
 344        .init_early     = ixp4xx_init_early,
 345        .init_irq       = ixp4xx_init_irq,
 346        .init_time      = ixp4xx_timer_init,
 347        .init_machine   = nas100d_init,
 348#if defined(CONFIG_PCI)
 349        .dma_zone_size  = SZ_64M,
 350#endif
 351        .restart        = ixp4xx_restart,
 352MACHINE_END
 353