arch/arm/mach-ixp4xx/nslu2-setup.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/arm/mach-ixp4xx/nslu2-setup.c
   4  *
   5  * NSLU2 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 nslu2-power.c:
  12  *      Copyright (C) 2005 Tower Technologies
  13  *
  14  * Author: Mark Rakes <mrakes at mac.com>
  15  * Author: Rod Whitby <rod@whitby.id.au>
  16  * Author: Alessandro Zummo <a.zummo@towertech.it>
  17  * Maintainers: http://www.nslu2-linux.org/
  18  *
  19  */
  20 #include <linux/gpio.h>
  21 #include <linux/if_ether.h>
  22 #include <linux/irq.h>
  23 #include <linux/serial.h>
  24 #include <linux/serial_8250.h>
  25 #include <linux/leds.h>
  26 #include <linux/reboot.h>
  27 #include <linux/i2c.h>
  28 #include <linux/i2c-gpio.h>
  29 #include <linux/io.h>
  30 #include <asm/mach-types.h>
  31 #include <asm/mach/arch.h>
  32 #include <asm/mach/flash.h>
  33 #include <asm/mach/time.h>
  34
  35 #define NSLU2_SDA_PIN           7
  36 #define NSLU2_SCL_PIN           6
  37
  38 /* NSLU2 Timer */
  39 #define NSLU2_FREQ 66000000
  40
  41 /* Buttons */
  42 #define NSLU2_PB_GPIO           5       /* power button */
  43 #define NSLU2_PO_GPIO           8       /* power off */
  44 #define NSLU2_RB_GPIO           12      /* reset button */
  45
  46 /* Buzzer */
  47 #define NSLU2_GPIO_BUZZ         4
  48
  49 /* LEDs */
  50 #define NSLU2_LED_RED_GPIO      0
  51 #define NSLU2_LED_GRN_GPIO      1
  52 #define NSLU2_LED_DISK1_GPIO    3
  53 #define NSLU2_LED_DISK2_GPIO    2
  54
  55 static struct flash_platform_data nslu2_flash_data = {
  56         .map_name               = "cfi_probe",
  57         .width                  = 2,
  58 };
  59
  60 static struct resource nslu2_flash_resource = {
  61         .flags                  = IORESOURCE_MEM,
  62 };
  63
  64 static struct platform_device nslu2_flash = {
  65         .name                   = "IXP4XX-Flash",
  66         .id                     = 0,
  67         .dev.platform_data      = &nslu2_flash_data,
  68         .num_resources          = 1,
  69         .resource               = &nslu2_flash_resource,
  70 };
  71
  72 static struct i2c_gpio_platform_data nslu2_i2c_gpio_data = {
  73         .sda_pin                = NSLU2_SDA_PIN,
  74         .scl_pin                = NSLU2_SCL_PIN,
  75 };
  76
  77 static struct i2c_board_info __initdata nslu2_i2c_board_info [] = {
  78         {
  79                 I2C_BOARD_INFO("x1205", 0x6f),
  80         },
  81 };
  82
  83 static struct gpio_led nslu2_led_pins[] = {
  84         {
  85                 .name           = "nslu2:green:ready",
  86                 .gpio           = NSLU2_LED_GRN_GPIO,
  87         },
  88         {
  89                 .name           = "nslu2:red:status",
  90                 .gpio           = NSLU2_LED_RED_GPIO,
  91         },
  92         {
  93                 .name           = "nslu2:green:disk-1",
  94                 .gpio           = NSLU2_LED_DISK1_GPIO,
  95                 .active_low     = true,
  96         },
  97         {
  98                 .name           = "nslu2:green:disk-2",
  99                 .gpio           = NSLU2_LED_DISK2_GPIO,
 100                 .active_low     = true,
 101         },
 102 };
 103
 104 static struct gpio_led_platform_data nslu2_led_data = {
 105         .num_leds               = ARRAY_SIZE(nslu2_led_pins),
 106         .leds                   = nslu2_led_pins,
 107 };
 108
 109 static struct platform_device nslu2_leds = {
 110         .name                   = "leds-gpio",
 111         .id                     = -1,
 112         .dev.platform_data      = &nslu2_led_data,
 113 };
 114
 115 static struct platform_device nslu2_i2c_gpio = {
 116         .name                   = "i2c-gpio",
 117         .id                     = 0,
 118         .dev     = {
 119                 .platform_data  = &nslu2_i2c_gpio_data,
 120         },
 121 };
 122
 123 static struct platform_device nslu2_beeper = {
 124         .name                   = "ixp4xx-beeper",
 125         .id                     = NSLU2_GPIO_BUZZ,
 126         .num_resources          = 0,
 127 };
 128
 129 static struct resource nslu2_uart_resources[] = {
 130         {
 131                 .start          = IXP4XX_UART1_BASE_PHYS,
 132                 .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
 133                 .flags          = IORESOURCE_MEM,
 134         },
 135         {
 136                 .start          = IXP4XX_UART2_BASE_PHYS,
 137                 .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
 138                 .flags          = IORESOURCE_MEM,
 139         }
 140 };
 141
 142 static struct plat_serial8250_port nslu2_uart_data[] = {
 143         {
 144                 .mapbase        = IXP4XX_UART1_BASE_PHYS,
 145                 .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
 146                 .irq            = IRQ_IXP4XX_UART1,
 147                 .flags          = UPF_BOOT_AUTOCONF,
 148                 .iotype         = UPIO_MEM,
 149                 .regshift       = 2,
 150                 .uartclk        = IXP4XX_UART_XTAL,
 151         },
 152         {
 153                 .mapbase        = IXP4XX_UART2_BASE_PHYS,
 154                 .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 155                 .irq            = IRQ_IXP4XX_UART2,
 156                 .flags          = UPF_BOOT_AUTOCONF,
 157                 .iotype         = UPIO_MEM,
 158                 .regshift       = 2,
 159                 .uartclk        = IXP4XX_UART_XTAL,
 160         },
 161         { }
 162 };
 163
 164 static struct platform_device nslu2_uart = {
 165         .name                   = "serial8250",
 166         .id                     = PLAT8250_DEV_PLATFORM,
 167         .dev.platform_data      = nslu2_uart_data,
 168         .num_resources          = 2,
 169         .resource               = nslu2_uart_resources,
 170 };
 171
 172 /* Built-in 10/100 Ethernet MAC interfaces */
 173 static struct eth_plat_info nslu2_plat_eth[] = {
 174         {
 175                 .phy            = 1,
 176                 .rxq            = 3,
 177                 .txreadyq       = 20,
 178         }
 179 };
 180
 181 static struct platform_device nslu2_eth[] = {
 182         {
 183                 .name                   = "ixp4xx_eth",
 184                 .id                     = IXP4XX_ETH_NPEB,
 185                 .dev.platform_data      = nslu2_plat_eth,
 186         }
 187 };
 188
 189 static struct platform_device *nslu2_devices[] __initdata = {
 190         &nslu2_i2c_gpio,
 191         &nslu2_flash,
 192         &nslu2_beeper,
 193         &nslu2_leds,
 194         &nslu2_eth[0],
 195 };
 196
 197 static void nslu2_power_off(void)
 198 {
 199         /* This causes the box to drop the power and go dead. */
 200
 201         /* enable the pwr cntl gpio and assert power off */
 202         gpio_direction_output(NSLU2_PO_GPIO, 1);
 203 }
 204
 205 static irqreturn_t nslu2_power_handler(int irq, void *dev_id)
 206 {
 207         /* Signal init to do the ctrlaltdel action, this will bypass init if
 208          * it hasn't started and do a kernel_restart.
 209          */
 210         ctrl_alt_del();
 211
 212         return IRQ_HANDLED;
 213 }
 214
 215 static irqreturn_t nslu2_reset_handler(int irq, void *dev_id)
 216 {
 217         /* This is the paper-clip reset, it shuts the machine down directly.
 218          */
 219         machine_power_off();
 220
 221         return IRQ_HANDLED;
 222 }
 223
 224 static int __init nslu2_gpio_init(void)
 225 {
 226         if (!machine_is_nslu2())
 227                 return 0;
 228
 229         /* Request the power off GPIO */
 230         return gpio_request(NSLU2_PO_GPIO, "power off");
 231 }
 232 device_initcall(nslu2_gpio_init);
 233
 234 static void __init nslu2_timer_init(void)
 235 {
 236     /* The xtal on this machine is non-standard. */
 237     ixp4xx_timer_freq = NSLU2_FREQ;
 238
 239     /* Call standard timer_init function. */
 240     ixp4xx_timer_init();
 241 }
 242
 243 static void __init nslu2_init(void)
 244 {
 245         uint8_t __iomem *f;
 246         int i;
 247
 248         ixp4xx_sys_init();
 249
 250         nslu2_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 251         nslu2_flash_resource.end =
 252                 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 253
 254         i2c_register_board_info(0, nslu2_i2c_board_info,
 255                                 ARRAY_SIZE(nslu2_i2c_board_info));
 256
 257         /*
 258          * This is only useful on a modified machine, but it is valuable
 259          * to have it first in order to see debug messages, and so that
 260          * it does *not* get removed if platform_add_devices fails!
 261          */
 262         (void)platform_device_register(&nslu2_uart);
 263
 264         platform_add_devices(nslu2_devices, ARRAY_SIZE(nslu2_devices));
 265
 266         pm_power_off = nslu2_power_off;
 267
 268         if (request_irq(gpio_to_irq(NSLU2_RB_GPIO), &nslu2_reset_handler,
 269                 IRQF_TRIGGER_LOW, "NSLU2 reset button", NULL) < 0) {
 270
 271                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 272                         gpio_to_irq(NSLU2_RB_GPIO));
 273         }
 274
 275         if (request_irq(gpio_to_irq(NSLU2_PB_GPIO), &nslu2_power_handler,
 276                 IRQF_TRIGGER_HIGH, "NSLU2 power button", NULL) < 0) {
 277
 278                 printk(KERN_DEBUG "Power Button IRQ %d not available\n",
 279                         gpio_to_irq(NSLU2_PB_GPIO));
 280         }
 281
 282         /*
 283          * Map in a portion of the flash and read the MAC address.
 284          * Since it is stored in BE in the flash itself, we need to
 285          * byteswap it if we're in LE mode.
 286          */
 287         f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x40000);
 288         if (f) {
 289                 for (i = 0; i < 6; i++)
 290 #ifdef __ARMEB__
 291                         nslu2_plat_eth[0].hwaddr[i] = readb(f + 0x3FFB0 + i);
 292 #else
 293                         nslu2_plat_eth[0].hwaddr[i] = readb(f + 0x3FFB0 + (i^3));
 294 #endif
 295                 iounmap(f);
 296         }
 297         printk(KERN_INFO "NSLU2: Using MAC address %pM for port 0\n",
 298                nslu2_plat_eth[0].hwaddr);
 299
 300 }
 301
 302 MACHINE_START(NSLU2, "Linksys NSLU2")
 303         /* Maintainer: www.nslu2-linux.org */
 304         .atag_offset    = 0x100,
 305         .map_io         = ixp4xx_map_io,
 306         .init_early     = ixp4xx_init_early,
 307         .init_irq       = ixp4xx_init_irq,
 308         .init_time      = nslu2_timer_init,
 309         .init_machine   = nslu2_init,
 310 #if defined(CONFIG_PCI)
 311         .dma_zone_size  = SZ_64M,
 312 #endif
 313         .restart        = ixp4xx_restart,
 314 MACHINE_END