LXR linux/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#include "irqs.h"
  33
  34#define FSG_SDA_PIN             12
  35#define FSG_SCL_PIN             13
  36
  37#define FSG_SB_GPIO             4       /* sync button */
  38#define FSG_RB_GPIO             9       /* reset button */
  39#define FSG_UB_GPIO             10      /* usb button */
  40
  41static struct flash_platform_data fsg_flash_data = {
  42        .map_name               = "cfi_probe",
  43        .width                  = 2,
  44};
  45
  46static struct resource fsg_flash_resource = {
  47        .flags                  = IORESOURCE_MEM,
  48};
  49
  50static struct platform_device fsg_flash = {
  51        .name                   = "IXP4XX-Flash",
  52        .id                     = 0,
  53        .dev = {
  54                .platform_data  = &fsg_flash_data,
  55        },
  56        .num_resources          = 1,
  57        .resource               = &fsg_flash_resource,
  58};
  59
  60static struct gpiod_lookup_table fsg_i2c_gpiod_table = {
  61        .dev_id         = "i2c-gpio.0",
  62        .table          = {
  63                GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", FSG_SDA_PIN,
  64                                NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
  65                GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", FSG_SCL_PIN,
  66                                NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
  67        },
  68};
  69
  70static struct platform_device fsg_i2c_gpio = {
  71        .name                   = "i2c-gpio",
  72        .id                     = 0,
  73        .dev = {
  74                .platform_data  = NULL,
  75        },
  76};
  77
  78static struct i2c_board_info __initdata fsg_i2c_board_info [] = {
  79        {
  80                I2C_BOARD_INFO("isl1208", 0x6f),
  81        },
  82};
  83
  84static struct resource fsg_uart_resources[] = {
  85        {
  86                .start          = IXP4XX_UART1_BASE_PHYS,
  87                .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
  88                .flags          = IORESOURCE_MEM,
  89        },
  90        {
  91                .start          = IXP4XX_UART2_BASE_PHYS,
  92                .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
  93                .flags          = IORESOURCE_MEM,
  94        }
  95};
  96
  97static struct plat_serial8250_port fsg_uart_data[] = {
  98        {
  99                .mapbase        = IXP4XX_UART1_BASE_PHYS,
 100                .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
 101                .irq            = IRQ_IXP4XX_UART1,
 102                .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
 103                .iotype         = UPIO_MEM,
 104                .regshift       = 2,
 105                .uartclk        = IXP4XX_UART_XTAL,
 106        },
 107        {
 108                .mapbase        = IXP4XX_UART2_BASE_PHYS,
 109                .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 110                .irq            = IRQ_IXP4XX_UART2,
 111                .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
 112                .iotype         = UPIO_MEM,
 113                .regshift       = 2,
 114                .uartclk        = IXP4XX_UART_XTAL,
 115        },
 116        { }
 117};
 118
 119static struct platform_device fsg_uart = {
 120        .name                   = "serial8250",
 121        .id                     = PLAT8250_DEV_PLATFORM,
 122        .dev = {
 123                .platform_data  = fsg_uart_data,
 124        },
 125        .num_resources          = ARRAY_SIZE(fsg_uart_resources),
 126        .resource               = fsg_uart_resources,
 127};
 128
 129static struct platform_device fsg_leds = {
 130        .name           = "fsg-led",
 131        .id             = -1,
 132};
 133
 134/* Built-in 10/100 Ethernet MAC interfaces */
 135static struct eth_plat_info fsg_plat_eth[] = {
 136        {
 137                .phy            = 5,
 138                .rxq            = 3,
 139                .txreadyq       = 20,
 140        }, {
 141                .phy            = 4,
 142                .rxq            = 4,
 143                .txreadyq       = 21,
 144        }
 145};
 146
 147static struct platform_device fsg_eth[] = {
 148        {
 149                .name                   = "ixp4xx_eth",
 150                .id                     = IXP4XX_ETH_NPEB,
 151                .dev = {
 152                        .platform_data  = fsg_plat_eth,
 153                },
 154        }, {
 155                .name                   = "ixp4xx_eth",
 156                .id                     = IXP4XX_ETH_NPEC,
 157                .dev = {
 158                        .platform_data  = fsg_plat_eth + 1,
 159                },
 160        }
 161};
 162
 163static struct platform_device *fsg_devices[] __initdata = {
 164        &fsg_i2c_gpio,
 165        &fsg_flash,
 166        &fsg_leds,
 167        &fsg_eth[0],
 168        &fsg_eth[1],
 169};
 170
 171static irqreturn_t fsg_power_handler(int irq, void *dev_id)
 172{
 173        /* Signal init to do the ctrlaltdel action, this will bypass init if
 174         * it hasn't started and do a kernel_restart.
 175         */
 176        ctrl_alt_del();
 177
 178        return IRQ_HANDLED;
 179}
 180
 181static irqreturn_t fsg_reset_handler(int irq, void *dev_id)
 182{
 183        /* This is the paper-clip reset which does an emergency reboot. */
 184        printk(KERN_INFO "Restarting system.\n");
 185        machine_restart(NULL);
 186
 187        /* This should never be reached. */
 188        return IRQ_HANDLED;
 189}
 190
 191static void __init fsg_init(void)
 192{
 193        uint8_t __iomem *f;
 194
 195        ixp4xx_sys_init();
 196
 197        fsg_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 198        fsg_flash_resource.end =
 199                IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 200
 201        *IXP4XX_EXP_CS0 |= IXP4XX_FLASH_WRITABLE;
 202        *IXP4XX_EXP_CS1 = *IXP4XX_EXP_CS0;
 203
 204        /* Configure CS2 for operation, 8bit and writable */
 205        *IXP4XX_EXP_CS2 = 0xbfff0002;
 206
 207        gpiod_add_lookup_table(&fsg_i2c_gpiod_table);
 208        i2c_register_board_info(0, fsg_i2c_board_info,
 209                                ARRAY_SIZE(fsg_i2c_board_info));
 210
 211        /* This is only useful on a modified machine, but it is valuable
 212         * to have it first in order to see debug messages, and so that
 213         * it does *not* get removed if platform_add_devices fails!
 214         */
 215        (void)platform_device_register(&fsg_uart);
 216
 217        platform_add_devices(fsg_devices, ARRAY_SIZE(fsg_devices));
 218
 219        if (request_irq(gpio_to_irq(FSG_RB_GPIO), &fsg_reset_handler,
 220                        IRQF_TRIGGER_LOW, "FSG reset button", NULL) < 0) {
 221
 222                printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 223                        gpio_to_irq(FSG_RB_GPIO));
 224        }
 225
 226        if (request_irq(gpio_to_irq(FSG_SB_GPIO), &fsg_power_handler,
 227                        IRQF_TRIGGER_LOW, "FSG power button", NULL) < 0) {
 228
 229                printk(KERN_DEBUG "Power Button IRQ %d not available\n",
 230                        gpio_to_irq(FSG_SB_GPIO));
 231        }
 232
 233        /*
 234         * Map in a portion of the flash and read the MAC addresses.
 235         * Since it is stored in BE in the flash itself, we need to
 236         * byteswap it if we're in LE mode.
 237         */
 238        f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x400000);
 239        if (f) {
 240#ifdef __ARMEB__
 241                int i;
 242                for (i = 0; i < 6; i++) {
 243                        fsg_plat_eth[0].hwaddr[i] = readb(f + 0x3C0422 + i);
 244                        fsg_plat_eth[1].hwaddr[i] = readb(f + 0x3C043B + i);
 245                }
 246#else
 247
 248                /*
 249                  Endian-swapped reads from unaligned addresses are
 250                  required to extract the two MACs from the big-endian
 251                  Redboot config area in flash.
 252                */
 253
 254                fsg_plat_eth[0].hwaddr[0] = readb(f + 0x3C0421);
 255                fsg_plat_eth[0].hwaddr[1] = readb(f + 0x3C0420);
 256                fsg_plat_eth[0].hwaddr[2] = readb(f + 0x3C0427);
 257                fsg_plat_eth[0].hwaddr[3] = readb(f + 0x3C0426);
 258                fsg_plat_eth[0].hwaddr[4] = readb(f + 0x3C0425);
 259                fsg_plat_eth[0].hwaddr[5] = readb(f + 0x3C0424);
 260
 261                fsg_plat_eth[1].hwaddr[0] = readb(f + 0x3C0439);
 262                fsg_plat_eth[1].hwaddr[1] = readb(f + 0x3C043F);
 263                fsg_plat_eth[1].hwaddr[2] = readb(f + 0x3C043E);
 264                fsg_plat_eth[1].hwaddr[3] = readb(f + 0x3C043D);
 265                fsg_plat_eth[1].hwaddr[4] = readb(f + 0x3C043C);
 266                fsg_plat_eth[1].hwaddr[5] = readb(f + 0x3C0443);
 267#endif
 268                iounmap(f);
 269        }
 270        printk(KERN_INFO "FSG: Using MAC address %pM for port 0\n",
 271               fsg_plat_eth[0].hwaddr);
 272        printk(KERN_INFO "FSG: Using MAC address %pM for port 1\n",
 273               fsg_plat_eth[1].hwaddr);
 274
 275}
 276
 277MACHINE_START(FSG, "Freecom FSG-3")
 278        /* Maintainer: www.nslu2-linux.org */
 279        .map_io         = ixp4xx_map_io,
 280        .init_early     = ixp4xx_init_early,
 281        .init_irq       = ixp4xx_init_irq,
 282        .init_time      = ixp4xx_timer_init,
 283        .atag_offset    = 0x100,
 284        .init_machine   = fsg_init,
 285#if defined(CONFIG_PCI)
 286        .dma_zone_size  = SZ_64M,
 287#endif
 288        .restart        = ixp4xx_restart,
 289MACHINE_END
 290
 291