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
  41 static struct flash_platform_data fsg_flash_data = {
  42         .map_name               = "cfi_probe",
  43         .width                  = 2,
  44 };
  45
  46 static struct resource fsg_flash_resource = {
  47         .flags                  = IORESOURCE_MEM,
  48 };
  49
  50 static 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
  60 static 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
  70 static struct platform_device fsg_i2c_gpio = {
  71         .name                   = "i2c-gpio",
  72         .id                     = 0,
  73         .dev = {
  74                 .platform_data  = NULL,
  75         },
  76 };
  77
  78 static struct i2c_board_info __initdata fsg_i2c_board_info [] = {
  79         {
  80                 I2C_BOARD_INFO("isl1208", 0x6f),
  81         },
  82 };
  83
  84 static 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
  97 static 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
 119 static 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
 129 static struct platform_device fsg_leds = {
 130         .name           = "fsg-led",
 131         .id             = -1,
 132 };
 133
 134 /* Built-in 10/100 Ethernet MAC interfaces */
 135 static 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
 147 static 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
 163 static 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
 171 static 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
 181 static 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
 191 static 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
 277 MACHINE_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,
 289 MACHINE_END
 290