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/gpio/machine.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 #include <mach/hardware.h>
  35
  36 #include "irqs.h"
  37
  38 #define NSLU2_SDA_PIN           7
  39 #define NSLU2_SCL_PIN           6
  40
  41 /* NSLU2 Timer */
  42 #define NSLU2_FREQ 66000000
  43
  44 /* Buttons */
  45 #define NSLU2_PB_GPIO           5       /* power button */
  46 #define NSLU2_PO_GPIO           8       /* power off */
  47 #define NSLU2_RB_GPIO           12      /* reset button */
  48
  49 /* Buzzer */
  50 #define NSLU2_GPIO_BUZZ         4
  51
  52 /* LEDs */
  53 #define NSLU2_LED_RED_GPIO      0
  54 #define NSLU2_LED_GRN_GPIO      1
  55 #define NSLU2_LED_DISK1_GPIO    3
  56 #define NSLU2_LED_DISK2_GPIO    2
  57
  58 static struct flash_platform_data nslu2_flash_data = {
  59         .map_name               = "cfi_probe",
  60         .width                  = 2,
  61 };
  62
  63 static struct resource nslu2_flash_resource = {
  64         .flags                  = IORESOURCE_MEM,
  65 };
  66
  67 static struct platform_device nslu2_flash = {
  68         .name                   = "IXP4XX-Flash",
  69         .id                     = 0,
  70         .dev.platform_data      = &nslu2_flash_data,
  71         .num_resources          = 1,
  72         .resource               = &nslu2_flash_resource,
  73 };
  74
  75 static struct gpiod_lookup_table nslu2_i2c_gpiod_table = {
  76         .dev_id         = "i2c-gpio.0",
  77         .table          = {
  78                 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NSLU2_SDA_PIN,
  79                                 NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
  80                 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NSLU2_SCL_PIN,
  81                                 NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
  82         },
  83 };
  84
  85 static struct i2c_board_info __initdata nslu2_i2c_board_info [] = {
  86         {
  87                 I2C_BOARD_INFO("x1205", 0x6f),
  88         },
  89 };
  90
  91 static struct gpio_led nslu2_led_pins[] = {
  92         {
  93                 .name           = "nslu2:green:ready",
  94                 .gpio           = NSLU2_LED_GRN_GPIO,
  95         },
  96         {
  97                 .name           = "nslu2:red:status",
  98                 .gpio           = NSLU2_LED_RED_GPIO,
  99         },
 100         {
 101                 .name           = "nslu2:green:disk-1",
 102                 .gpio           = NSLU2_LED_DISK1_GPIO,
 103                 .active_low     = true,
 104         },
 105         {
 106                 .name           = "nslu2:green:disk-2",
 107                 .gpio           = NSLU2_LED_DISK2_GPIO,
 108                 .active_low     = true,
 109         },
 110 };
 111
 112 static struct gpio_led_platform_data nslu2_led_data = {
 113         .num_leds               = ARRAY_SIZE(nslu2_led_pins),
 114         .leds                   = nslu2_led_pins,
 115 };
 116
 117 static struct platform_device nslu2_leds = {
 118         .name                   = "leds-gpio",
 119         .id                     = -1,
 120         .dev.platform_data      = &nslu2_led_data,
 121 };
 122
 123 static struct platform_device nslu2_i2c_gpio = {
 124         .name                   = "i2c-gpio",
 125         .id                     = 0,
 126         .dev     = {
 127                 .platform_data  = NULL,
 128         },
 129 };
 130
 131 static struct resource nslu2_beeper_resources[] = {
 132         {
 133                 .start  = IRQ_IXP4XX_TIMER2,
 134                 .flags  = IORESOURCE_IRQ,
 135         },
 136 };
 137
 138 static struct platform_device nslu2_beeper = {
 139         .name                   = "ixp4xx-beeper",
 140         .id                     = NSLU2_GPIO_BUZZ,
 141         .resource               = nslu2_beeper_resources,
 142         .num_resources          = ARRAY_SIZE(nslu2_beeper_resources),
 143 };
 144
 145 static struct resource nslu2_uart_resources[] = {
 146         {
 147                 .start          = IXP4XX_UART1_BASE_PHYS,
 148                 .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
 149                 .flags          = IORESOURCE_MEM,
 150         },
 151         {
 152                 .start          = IXP4XX_UART2_BASE_PHYS,
 153                 .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
 154                 .flags          = IORESOURCE_MEM,
 155         }
 156 };
 157
 158 static struct plat_serial8250_port nslu2_uart_data[] = {
 159         {
 160                 .mapbase        = IXP4XX_UART1_BASE_PHYS,
 161                 .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
 162                 .irq            = IRQ_IXP4XX_UART1,
 163                 .flags          = UPF_BOOT_AUTOCONF,
 164                 .iotype         = UPIO_MEM,
 165                 .regshift       = 2,
 166                 .uartclk        = IXP4XX_UART_XTAL,
 167         },
 168         {
 169                 .mapbase        = IXP4XX_UART2_BASE_PHYS,
 170                 .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 171                 .irq            = IRQ_IXP4XX_UART2,
 172                 .flags          = UPF_BOOT_AUTOCONF,
 173                 .iotype         = UPIO_MEM,
 174                 .regshift       = 2,
 175                 .uartclk        = IXP4XX_UART_XTAL,
 176         },
 177         { }
 178 };
 179
 180 static struct platform_device nslu2_uart = {
 181         .name                   = "serial8250",
 182         .id                     = PLAT8250_DEV_PLATFORM,
 183         .dev.platform_data      = nslu2_uart_data,
 184         .num_resources          = 2,
 185         .resource               = nslu2_uart_resources,
 186 };
 187
 188 /* Built-in 10/100 Ethernet MAC interfaces */
 189 static struct resource nslu2_eth_resources[] = {
 190         {
 191                 .start          = IXP4XX_EthB_BASE_PHYS,
 192                 .end            = IXP4XX_EthB_BASE_PHYS + 0x0fff,
 193                 .flags          = IORESOURCE_MEM,
 194         },
 195 };
 196
 197 static struct eth_plat_info nslu2_plat_eth[] = {
 198         {
 199                 .phy            = 1,
 200                 .rxq            = 3,
 201                 .txreadyq       = 20,
 202         }
 203 };
 204
 205 static struct platform_device nslu2_eth[] = {
 206         {
 207                 .name                   = "ixp4xx_eth",
 208                 .id                     = IXP4XX_ETH_NPEB,
 209                 .dev.platform_data      = nslu2_plat_eth,
 210                 .num_resources          = ARRAY_SIZE(nslu2_eth_resources),
 211                 .resource               = nslu2_eth_resources,
 212         }
 213 };
 214
 215 static struct platform_device *nslu2_devices[] __initdata = {
 216         &nslu2_i2c_gpio,
 217         &nslu2_flash,
 218         &nslu2_beeper,
 219         &nslu2_leds,
 220         &nslu2_eth[0],
 221 };
 222
 223 static void nslu2_power_off(void)
 224 {
 225         /* This causes the box to drop the power and go dead. */
 226
 227         /* enable the pwr cntl gpio and assert power off */
 228         gpio_direction_output(NSLU2_PO_GPIO, 1);
 229 }
 230
 231 static irqreturn_t nslu2_power_handler(int irq, void *dev_id)
 232 {
 233         /* Signal init to do the ctrlaltdel action, this will bypass init if
 234          * it hasn't started and do a kernel_restart.
 235          */
 236         ctrl_alt_del();
 237
 238         return IRQ_HANDLED;
 239 }
 240
 241 static irqreturn_t nslu2_reset_handler(int irq, void *dev_id)
 242 {
 243         /* This is the paper-clip reset, it shuts the machine down directly.
 244          */
 245         machine_power_off();
 246
 247         return IRQ_HANDLED;
 248 }
 249
 250 static int __init nslu2_gpio_init(void)
 251 {
 252         if (!machine_is_nslu2())
 253                 return 0;
 254
 255         /* Request the power off GPIO */
 256         return gpio_request(NSLU2_PO_GPIO, "power off");
 257 }
 258 device_initcall(nslu2_gpio_init);
 259
 260 static void __init nslu2_timer_init(void)
 261 {
 262     /* The xtal on this machine is non-standard. */
 263     ixp4xx_timer_freq = NSLU2_FREQ;
 264
 265     /* Call standard timer_init function. */
 266     ixp4xx_timer_init();
 267 }
 268
 269 static void __init nslu2_init(void)
 270 {
 271         uint8_t __iomem *f;
 272         int i;
 273
 274         ixp4xx_sys_init();
 275
 276         nslu2_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 277         nslu2_flash_resource.end =
 278                 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 279
 280         gpiod_add_lookup_table(&nslu2_i2c_gpiod_table);
 281         i2c_register_board_info(0, nslu2_i2c_board_info,
 282                                 ARRAY_SIZE(nslu2_i2c_board_info));
 283
 284         /*
 285          * This is only useful on a modified machine, but it is valuable
 286          * to have it first in order to see debug messages, and so that
 287          * it does *not* get removed if platform_add_devices fails!
 288          */
 289         (void)platform_device_register(&nslu2_uart);
 290
 291         platform_add_devices(nslu2_devices, ARRAY_SIZE(nslu2_devices));
 292
 293         pm_power_off = nslu2_power_off;
 294
 295         if (request_irq(gpio_to_irq(NSLU2_RB_GPIO), &nslu2_reset_handler,
 296                 IRQF_TRIGGER_LOW, "NSLU2 reset button", NULL) < 0) {
 297
 298                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 299                         gpio_to_irq(NSLU2_RB_GPIO));
 300         }
 301
 302         if (request_irq(gpio_to_irq(NSLU2_PB_GPIO), &nslu2_power_handler,
 303                 IRQF_TRIGGER_HIGH, "NSLU2 power button", NULL) < 0) {
 304
 305                 printk(KERN_DEBUG "Power Button IRQ %d not available\n",
 306                         gpio_to_irq(NSLU2_PB_GPIO));
 307         }
 308
 309         /*
 310          * Map in a portion of the flash and read the MAC address.
 311          * Since it is stored in BE in the flash itself, we need to
 312          * byteswap it if we're in LE mode.
 313          */
 314         f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x40000);
 315         if (f) {
 316                 for (i = 0; i < 6; i++)
 317 #ifdef __ARMEB__
 318                         nslu2_plat_eth[0].hwaddr[i] = readb(f + 0x3FFB0 + i);
 319 #else
 320                         nslu2_plat_eth[0].hwaddr[i] = readb(f + 0x3FFB0 + (i^3));
 321 #endif
 322                 iounmap(f);
 323         }
 324         printk(KERN_INFO "NSLU2: Using MAC address %pM for port 0\n",
 325                nslu2_plat_eth[0].hwaddr);
 326
 327 }
 328
 329 MACHINE_START(NSLU2, "Linksys NSLU2")
 330         /* Maintainer: www.nslu2-linux.org */
 331         .atag_offset    = 0x100,
 332         .map_io         = ixp4xx_map_io,
 333         .init_early     = ixp4xx_init_early,
 334         .init_irq       = ixp4xx_init_irq,
 335         .init_time      = nslu2_timer_init,
 336         .init_machine   = nslu2_init,
 337 #if defined(CONFIG_PCI)
 338         .dma_zone_size  = SZ_64M,
 339 #endif
 340         .restart        = ixp4xx_restart,
 341 MACHINE_END