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