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