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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/arm/mach-ixp4xx/fsg-setup.c
   4  *
   5  * FSG 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: Rod Whitby <rod@whitby.id.au>
  15  * Maintainers: http://www.nslu2-linux.org/
  16  *
  17  */
  18 #include <linux/gpio.h>
  19 #include <linux/if_ether.h>
  20 #include <linux/irq.h>
  21 #include <linux/serial.h>
  22 #include <linux/serial_8250.h>
  23 #include <linux/leds.h>
  24 #include <linux/reboot.h>
  25 #include <linux/i2c.h>
  26 #include <linux/i2c-gpio.h>
  27 #include <linux/io.h>
  28 #include <asm/mach-types.h>
  29 #include <asm/mach/arch.h>
  30 #include <asm/mach/flash.h>
  31
  32 #define FSG_SDA_PIN             12
  33 #define FSG_SCL_PIN             13
  34
  35 #define FSG_SB_GPIO             4       /* sync button */
  36 #define FSG_RB_GPIO             9       /* reset button */
  37 #define FSG_UB_GPIO             10      /* usb button */
  38
  39 static struct flash_platform_data fsg_flash_data = {
  40         .map_name               = "cfi_probe",
  41         .width                  = 2,
  42 };
  43
  44 static struct resource fsg_flash_resource = {
  45         .flags                  = IORESOURCE_MEM,
  46 };
  47
  48 static struct platform_device fsg_flash = {
  49         .name                   = "IXP4XX-Flash",
  50         .id                     = 0,
  51         .dev = {
  52                 .platform_data  = &fsg_flash_data,
  53         },
  54         .num_resources          = 1,
  55         .resource               = &fsg_flash_resource,
  56 };
  57
  58 static struct i2c_gpio_platform_data fsg_i2c_gpio_data = {
  59         .sda_pin                = FSG_SDA_PIN,
  60         .scl_pin                = FSG_SCL_PIN,
  61 };
  62
  63 static struct platform_device fsg_i2c_gpio = {
  64         .name                   = "i2c-gpio",
  65         .id                     = 0,
  66         .dev = {
  67                 .platform_data  = &fsg_i2c_gpio_data,
  68         },
  69 };
  70
  71 static struct i2c_board_info __initdata fsg_i2c_board_info [] = {
  72         {
  73                 I2C_BOARD_INFO("isl1208", 0x6f),
  74         },
  75 };
  76
  77 static struct resource fsg_uart_resources[] = {
  78         {
  79                 .start          = IXP4XX_UART1_BASE_PHYS,
  80                 .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
  81                 .flags          = IORESOURCE_MEM,
  82         },
  83         {
  84                 .start          = IXP4XX_UART2_BASE_PHYS,
  85                 .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
  86                 .flags          = IORESOURCE_MEM,
  87         }
  88 };
  89
  90 static struct plat_serial8250_port fsg_uart_data[] = {
  91         {
  92                 .mapbase        = IXP4XX_UART1_BASE_PHYS,
  93                 .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
  94                 .irq            = IRQ_IXP4XX_UART1,
  95                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
  96                 .iotype         = UPIO_MEM,
  97                 .regshift       = 2,
  98                 .uartclk        = IXP4XX_UART_XTAL,
  99         },
 100         {
 101                 .mapbase        = IXP4XX_UART2_BASE_PHYS,
 102                 .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 103                 .irq            = IRQ_IXP4XX_UART2,
 104                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
 105                 .iotype         = UPIO_MEM,
 106                 .regshift       = 2,
 107                 .uartclk        = IXP4XX_UART_XTAL,
 108         },
 109         { }
 110 };
 111
 112 static struct platform_device fsg_uart = {
 113         .name                   = "serial8250",
 114         .id                     = PLAT8250_DEV_PLATFORM,
 115         .dev = {
 116                 .platform_data  = fsg_uart_data,
 117         },
 118         .num_resources          = ARRAY_SIZE(fsg_uart_resources),
 119         .resource               = fsg_uart_resources,
 120 };
 121
 122 static struct platform_device fsg_leds = {
 123         .name           = "fsg-led",
 124         .id             = -1,
 125 };
 126
 127 /* Built-in 10/100 Ethernet MAC interfaces */
 128 static struct eth_plat_info fsg_plat_eth[] = {
 129         {
 130                 .phy            = 5,
 131                 .rxq            = 3,
 132                 .txreadyq       = 20,
 133         }, {
 134                 .phy            = 4,
 135                 .rxq            = 4,
 136                 .txreadyq       = 21,
 137         }
 138 };
 139
 140 static struct platform_device fsg_eth[] = {
 141         {
 142                 .name                   = "ixp4xx_eth",
 143                 .id                     = IXP4XX_ETH_NPEB,
 144                 .dev = {
 145                         .platform_data  = fsg_plat_eth,
 146                 },
 147         }, {
 148                 .name                   = "ixp4xx_eth",
 149                 .id                     = IXP4XX_ETH_NPEC,
 150                 .dev = {
 151                         .platform_data  = fsg_plat_eth + 1,
 152                 },
 153         }
 154 };
 155
 156 static struct platform_device *fsg_devices[] __initdata = {
 157         &fsg_i2c_gpio,
 158         &fsg_flash,
 159         &fsg_leds,
 160         &fsg_eth[0],
 161         &fsg_eth[1],
 162 };
 163
 164 static irqreturn_t fsg_power_handler(int irq, void *dev_id)
 165 {
 166         /* Signal init to do the ctrlaltdel action, this will bypass init if
 167          * it hasn't started and do a kernel_restart.
 168          */
 169         ctrl_alt_del();
 170
 171         return IRQ_HANDLED;
 172 }
 173
 174 static irqreturn_t fsg_reset_handler(int irq, void *dev_id)
 175 {
 176         /* This is the paper-clip reset which does an emergency reboot. */
 177         printk(KERN_INFO "Restarting system.\n");
 178         machine_restart(NULL);
 179
 180         /* This should never be reached. */
 181         return IRQ_HANDLED;
 182 }
 183
 184 static void __init fsg_init(void)
 185 {
 186         uint8_t __iomem *f;
 187
 188         ixp4xx_sys_init();
 189
 190         fsg_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 191         fsg_flash_resource.end =
 192                 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 193
 194         *IXP4XX_EXP_CS0 |= IXP4XX_FLASH_WRITABLE;
 195         *IXP4XX_EXP_CS1 = *IXP4XX_EXP_CS0;
 196
 197         /* Configure CS2 for operation, 8bit and writable */
 198         *IXP4XX_EXP_CS2 = 0xbfff0002;
 199
 200         i2c_register_board_info(0, fsg_i2c_board_info,
 201                                 ARRAY_SIZE(fsg_i2c_board_info));
 202
 203         /* This is only useful on a modified machine, but it is valuable
 204          * to have it first in order to see debug messages, and so that
 205          * it does *not* get removed if platform_add_devices fails!
 206          */
 207         (void)platform_device_register(&fsg_uart);
 208
 209         platform_add_devices(fsg_devices, ARRAY_SIZE(fsg_devices));
 210
 211         if (request_irq(gpio_to_irq(FSG_RB_GPIO), &fsg_reset_handler,
 212                         IRQF_TRIGGER_LOW, "FSG reset button", NULL) < 0) {
 213
 214                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 215                         gpio_to_irq(FSG_RB_GPIO));
 216         }
 217
 218         if (request_irq(gpio_to_irq(FSG_SB_GPIO), &fsg_power_handler,
 219                         IRQF_TRIGGER_LOW, "FSG power button", NULL) < 0) {
 220
 221                 printk(KERN_DEBUG "Power Button IRQ %d not available\n",
 222                         gpio_to_irq(FSG_SB_GPIO));
 223         }
 224
 225         /*
 226          * Map in a portion of the flash and read the MAC addresses.
 227          * Since it is stored in BE in the flash itself, we need to
 228          * byteswap it if we're in LE mode.
 229          */
 230         f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x400000);
 231         if (f) {
 232 #ifdef __ARMEB__
 233                 int i;
 234                 for (i = 0; i < 6; i++) {
 235                         fsg_plat_eth[0].hwaddr[i] = readb(f + 0x3C0422 + i);
 236                         fsg_plat_eth[1].hwaddr[i] = readb(f + 0x3C043B + i);
 237                 }
 238 #else
 239
 240                 /*
 241                   Endian-swapped reads from unaligned addresses are
 242                   required to extract the two MACs from the big-endian
 243                   Redboot config area in flash.
 244                 */
 245
 246                 fsg_plat_eth[0].hwaddr[0] = readb(f + 0x3C0421);
 247                 fsg_plat_eth[0].hwaddr[1] = readb(f + 0x3C0420);
 248                 fsg_plat_eth[0].hwaddr[2] = readb(f + 0x3C0427);
 249                 fsg_plat_eth[0].hwaddr[3] = readb(f + 0x3C0426);
 250                 fsg_plat_eth[0].hwaddr[4] = readb(f + 0x3C0425);
 251                 fsg_plat_eth[0].hwaddr[5] = readb(f + 0x3C0424);
 252
 253                 fsg_plat_eth[1].hwaddr[0] = readb(f + 0x3C0439);
 254                 fsg_plat_eth[1].hwaddr[1] = readb(f + 0x3C043F);
 255                 fsg_plat_eth[1].hwaddr[2] = readb(f + 0x3C043E);
 256                 fsg_plat_eth[1].hwaddr[3] = readb(f + 0x3C043D);
 257                 fsg_plat_eth[1].hwaddr[4] = readb(f + 0x3C043C);
 258                 fsg_plat_eth[1].hwaddr[5] = readb(f + 0x3C0443);
 259 #endif
 260                 iounmap(f);
 261         }
 262         printk(KERN_INFO "FSG: Using MAC address %pM for port 0\n",
 263                fsg_plat_eth[0].hwaddr);
 264         printk(KERN_INFO "FSG: Using MAC address %pM for port 1\n",
 265                fsg_plat_eth[1].hwaddr);
 266
 267 }
 268
 269 MACHINE_START(FSG, "Freecom FSG-3")
 270         /* Maintainer: www.nslu2-linux.org */
 271         .map_io         = ixp4xx_map_io,
 272         .init_early     = ixp4xx_init_early,
 273         .init_irq       = ixp4xx_init_irq,
 274         .init_time      = ixp4xx_timer_init,
 275         .atag_offset    = 0x100,
 276         .init_machine   = fsg_init,
 277 #if defined(CONFIG_PCI)
 278         .dma_zone_size  = SZ_64M,
 279 #endif
 280         .restart        = ixp4xx_restart,
 281 MACHINE_END
 282