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/gpio/machine.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 gpiod_lookup_table fsg_i2c_gpiod_table = {
  59         .dev_id         = "i2c-gpio.0",
  60         .table          = {
  61                 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", FSG_SDA_PIN,
  62                                 NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
  63                 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", FSG_SCL_PIN,
  64                                 NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
  65         },
  66 };
  67
  68 static struct platform_device fsg_i2c_gpio = {
  69         .name                   = "i2c-gpio",
  70         .id                     = 0,
  71         .dev = {
  72                 .platform_data  = NULL,
  73         },
  74 };
  75
  76 static struct i2c_board_info __initdata fsg_i2c_board_info [] = {
  77         {
  78                 I2C_BOARD_INFO("isl1208", 0x6f),
  79         },
  80 };
  81
  82 static struct resource fsg_uart_resources[] = {
  83         {
  84                 .start          = IXP4XX_UART1_BASE_PHYS,
  85                 .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
  86                 .flags          = IORESOURCE_MEM,
  87         },
  88         {
  89                 .start          = IXP4XX_UART2_BASE_PHYS,
  90                 .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
  91                 .flags          = IORESOURCE_MEM,
  92         }
  93 };
  94
  95 static struct plat_serial8250_port fsg_uart_data[] = {
  96         {
  97                 .mapbase        = IXP4XX_UART1_BASE_PHYS,
  98                 .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
  99                 .irq            = IRQ_IXP4XX_UART1,
 100                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
 101                 .iotype         = UPIO_MEM,
 102                 .regshift       = 2,
 103                 .uartclk        = IXP4XX_UART_XTAL,
 104         },
 105         {
 106                 .mapbase        = IXP4XX_UART2_BASE_PHYS,
 107                 .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 108                 .irq            = IRQ_IXP4XX_UART2,
 109                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
 110                 .iotype         = UPIO_MEM,
 111                 .regshift       = 2,
 112                 .uartclk        = IXP4XX_UART_XTAL,
 113         },
 114         { }
 115 };
 116
 117 static struct platform_device fsg_uart = {
 118         .name                   = "serial8250",
 119         .id                     = PLAT8250_DEV_PLATFORM,
 120         .dev = {
 121                 .platform_data  = fsg_uart_data,
 122         },
 123         .num_resources          = ARRAY_SIZE(fsg_uart_resources),
 124         .resource               = fsg_uart_resources,
 125 };
 126
 127 static struct platform_device fsg_leds = {
 128         .name           = "fsg-led",
 129         .id             = -1,
 130 };
 131
 132 /* Built-in 10/100 Ethernet MAC interfaces */
 133 static struct eth_plat_info fsg_plat_eth[] = {
 134         {
 135                 .phy            = 5,
 136                 .rxq            = 3,
 137                 .txreadyq       = 20,
 138         }, {
 139                 .phy            = 4,
 140                 .rxq            = 4,
 141                 .txreadyq       = 21,
 142         }
 143 };
 144
 145 static struct platform_device fsg_eth[] = {
 146         {
 147                 .name                   = "ixp4xx_eth",
 148                 .id                     = IXP4XX_ETH_NPEB,
 149                 .dev = {
 150                         .platform_data  = fsg_plat_eth,
 151                 },
 152         }, {
 153                 .name                   = "ixp4xx_eth",
 154                 .id                     = IXP4XX_ETH_NPEC,
 155                 .dev = {
 156                         .platform_data  = fsg_plat_eth + 1,
 157                 },
 158         }
 159 };
 160
 161 static struct platform_device *fsg_devices[] __initdata = {
 162         &fsg_i2c_gpio,
 163         &fsg_flash,
 164         &fsg_leds,
 165         &fsg_eth[0],
 166         &fsg_eth[1],
 167 };
 168
 169 static irqreturn_t fsg_power_handler(int irq, void *dev_id)
 170 {
 171         /* Signal init to do the ctrlaltdel action, this will bypass init if
 172          * it hasn't started and do a kernel_restart.
 173          */
 174         ctrl_alt_del();
 175
 176         return IRQ_HANDLED;
 177 }
 178
 179 static irqreturn_t fsg_reset_handler(int irq, void *dev_id)
 180 {
 181         /* This is the paper-clip reset which does an emergency reboot. */
 182         printk(KERN_INFO "Restarting system.\n");
 183         machine_restart(NULL);
 184
 185         /* This should never be reached. */
 186         return IRQ_HANDLED;
 187 }
 188
 189 static void __init fsg_init(void)
 190 {
 191         uint8_t __iomem *f;
 192
 193         ixp4xx_sys_init();
 194
 195         fsg_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 196         fsg_flash_resource.end =
 197                 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 198
 199         *IXP4XX_EXP_CS0 |= IXP4XX_FLASH_WRITABLE;
 200         *IXP4XX_EXP_CS1 = *IXP4XX_EXP_CS0;
 201
 202         /* Configure CS2 for operation, 8bit and writable */
 203         *IXP4XX_EXP_CS2 = 0xbfff0002;
 204
 205         gpiod_add_lookup_table(&fsg_i2c_gpiod_table);
 206         i2c_register_board_info(0, fsg_i2c_board_info,
 207                                 ARRAY_SIZE(fsg_i2c_board_info));
 208
 209         /* This is only useful on a modified machine, but it is valuable
 210          * to have it first in order to see debug messages, and so that
 211          * it does *not* get removed if platform_add_devices fails!
 212          */
 213         (void)platform_device_register(&fsg_uart);
 214
 215         platform_add_devices(fsg_devices, ARRAY_SIZE(fsg_devices));
 216
 217         if (request_irq(gpio_to_irq(FSG_RB_GPIO), &fsg_reset_handler,
 218                         IRQF_TRIGGER_LOW, "FSG reset button", NULL) < 0) {
 219
 220                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 221                         gpio_to_irq(FSG_RB_GPIO));
 222         }
 223
 224         if (request_irq(gpio_to_irq(FSG_SB_GPIO), &fsg_power_handler,
 225                         IRQF_TRIGGER_LOW, "FSG power button", NULL) < 0) {
 226
 227                 printk(KERN_DEBUG "Power Button IRQ %d not available\n",
 228                         gpio_to_irq(FSG_SB_GPIO));
 229         }
 230
 231         /*
 232          * Map in a portion of the flash and read the MAC addresses.
 233          * Since it is stored in BE in the flash itself, we need to
 234          * byteswap it if we're in LE mode.
 235          */
 236         f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x400000);
 237         if (f) {
 238 #ifdef __ARMEB__
 239                 int i;
 240                 for (i = 0; i < 6; i++) {
 241                         fsg_plat_eth[0].hwaddr[i] = readb(f + 0x3C0422 + i);
 242                         fsg_plat_eth[1].hwaddr[i] = readb(f + 0x3C043B + i);
 243                 }
 244 #else
 245
 246                 /*
 247                   Endian-swapped reads from unaligned addresses are
 248                   required to extract the two MACs from the big-endian
 249                   Redboot config area in flash.
 250                 */
 251
 252                 fsg_plat_eth[0].hwaddr[0] = readb(f + 0x3C0421);
 253                 fsg_plat_eth[0].hwaddr[1] = readb(f + 0x3C0420);
 254                 fsg_plat_eth[0].hwaddr[2] = readb(f + 0x3C0427);
 255                 fsg_plat_eth[0].hwaddr[3] = readb(f + 0x3C0426);
 256                 fsg_plat_eth[0].hwaddr[4] = readb(f + 0x3C0425);
 257                 fsg_plat_eth[0].hwaddr[5] = readb(f + 0x3C0424);
 258
 259                 fsg_plat_eth[1].hwaddr[0] = readb(f + 0x3C0439);
 260                 fsg_plat_eth[1].hwaddr[1] = readb(f + 0x3C043F);
 261                 fsg_plat_eth[1].hwaddr[2] = readb(f + 0x3C043E);
 262                 fsg_plat_eth[1].hwaddr[3] = readb(f + 0x3C043D);
 263                 fsg_plat_eth[1].hwaddr[4] = readb(f + 0x3C043C);
 264                 fsg_plat_eth[1].hwaddr[5] = readb(f + 0x3C0443);
 265 #endif
 266                 iounmap(f);
 267         }
 268         printk(KERN_INFO "FSG: Using MAC address %pM for port 0\n",
 269                fsg_plat_eth[0].hwaddr);
 270         printk(KERN_INFO "FSG: Using MAC address %pM for port 1\n",
 271                fsg_plat_eth[1].hwaddr);
 272
 273 }
 274
 275 MACHINE_START(FSG, "Freecom FSG-3")
 276         /* Maintainer: www.nslu2-linux.org */
 277         .map_io         = ixp4xx_map_io,
 278         .init_early     = ixp4xx_init_early,
 279         .init_irq       = ixp4xx_init_irq,
 280         .init_time      = ixp4xx_timer_init,
 281         .atag_offset    = 0x100,
 282         .init_machine   = fsg_init,
 283 #if defined(CONFIG_PCI)
 284         .dma_zone_size  = SZ_64M,
 285 #endif
 286         .restart        = ixp4xx_restart,
 287 MACHINE_END
 288