root/arch/arm/mach-ixp4xx/nas100d-setup.c

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DEFINITIONS

This source file includes following definitions.
  1. nas100d_power_off
  2. nas100d_power_handler
  3. nas100d_reset_handler
  4. nas100d_gpio_init
  5. nas100d_init
   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/arm/mach-ixp4xx/nas100d-setup.c
   4  *
   5  * NAS 100d 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 nas100d-power.c:
  12  *      Copyright (C) 2005 Tower Technologies
  13  * based on nas100d-io.c
  14  *      Copyright (C) 2004 Karen Spearel
  15  *
  16  * Author: Alessandro Zummo <a.zummo@towertech.it>
  17  * Author: Rod Whitby <rod@whitby.id.au>
  18  * Maintainers: http://www.nslu2-linux.org/
  19  *
  20  */
  21 #include <linux/gpio.h>
  22 #include <linux/if_ether.h>
  23 #include <linux/irq.h>
  24 #include <linux/jiffies.h>
  25 #include <linux/timer.h>
  26 #include <linux/serial.h>
  27 #include <linux/serial_8250.h>
  28 #include <linux/leds.h>
  29 #include <linux/reboot.h>
  30 #include <linux/i2c.h>
  31 #include <linux/gpio/machine.h>
  32 #include <linux/io.h>
  33 #include <asm/mach-types.h>
  34 #include <asm/mach/arch.h>
  35 #include <asm/mach/flash.h>
  36 
  37 #include "irqs.h"
  38 
  39 #define NAS100D_SDA_PIN         5
  40 #define NAS100D_SCL_PIN         6
  41 
  42 /* Buttons */
  43 #define NAS100D_PB_GPIO         14   /* power button */
  44 #define NAS100D_RB_GPIO         4    /* reset button */
  45 
  46 /* Power control */
  47 #define NAS100D_PO_GPIO         12   /* power off */
  48 
  49 /* LEDs */
  50 #define NAS100D_LED_WLAN_GPIO   0
  51 #define NAS100D_LED_DISK_GPIO   3
  52 #define NAS100D_LED_PWR_GPIO    15
  53 
  54 static struct flash_platform_data nas100d_flash_data = {
  55         .map_name               = "cfi_probe",
  56         .width                  = 2,
  57 };
  58 
  59 static struct resource nas100d_flash_resource = {
  60         .flags                  = IORESOURCE_MEM,
  61 };
  62 
  63 static struct platform_device nas100d_flash = {
  64         .name                   = "IXP4XX-Flash",
  65         .id                     = 0,
  66         .dev.platform_data      = &nas100d_flash_data,
  67         .num_resources          = 1,
  68         .resource               = &nas100d_flash_resource,
  69 };
  70 
  71 static struct i2c_board_info __initdata nas100d_i2c_board_info [] = {
  72         {
  73                 I2C_BOARD_INFO("pcf8563", 0x51),
  74         },
  75 };
  76 
  77 static struct gpio_led nas100d_led_pins[] = {
  78         {
  79                 .name           = "nas100d:green:wlan",
  80                 .gpio           = NAS100D_LED_WLAN_GPIO,
  81                 .active_low     = true,
  82         },
  83         {
  84                 .name           = "nas100d:blue:power",  /* (off=flashing) */
  85                 .gpio           = NAS100D_LED_PWR_GPIO,
  86                 .active_low     = true,
  87         },
  88         {
  89                 .name           = "nas100d:yellow:disk",
  90                 .gpio           = NAS100D_LED_DISK_GPIO,
  91                 .active_low     = true,
  92         },
  93 };
  94 
  95 static struct gpio_led_platform_data nas100d_led_data = {
  96         .num_leds               = ARRAY_SIZE(nas100d_led_pins),
  97         .leds                   = nas100d_led_pins,
  98 };
  99 
 100 static struct platform_device nas100d_leds = {
 101         .name                   = "leds-gpio",
 102         .id                     = -1,
 103         .dev.platform_data      = &nas100d_led_data,
 104 };
 105 
 106 static struct gpiod_lookup_table nas100d_i2c_gpiod_table = {
 107         .dev_id         = "i2c-gpio.0",
 108         .table          = {
 109                 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SDA_PIN,
 110                                 NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
 111                 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", NAS100D_SCL_PIN,
 112                                 NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
 113         },
 114 };
 115 
 116 static struct platform_device nas100d_i2c_gpio = {
 117         .name                   = "i2c-gpio",
 118         .id                     = 0,
 119         .dev     = {
 120                 .platform_data  = NULL,
 121         },
 122 };
 123 
 124 static struct resource nas100d_uart_resources[] = {
 125         {
 126                 .start          = IXP4XX_UART1_BASE_PHYS,
 127                 .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
 128                 .flags          = IORESOURCE_MEM,
 129         },
 130         {
 131                 .start          = IXP4XX_UART2_BASE_PHYS,
 132                 .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
 133                 .flags          = IORESOURCE_MEM,
 134         }
 135 };
 136 
 137 static struct plat_serial8250_port nas100d_uart_data[] = {
 138         {
 139                 .mapbase        = IXP4XX_UART1_BASE_PHYS,
 140                 .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
 141                 .irq            = IRQ_IXP4XX_UART1,
 142                 .flags          = UPF_BOOT_AUTOCONF,
 143                 .iotype         = UPIO_MEM,
 144                 .regshift       = 2,
 145                 .uartclk        = IXP4XX_UART_XTAL,
 146         },
 147         {
 148                 .mapbase        = IXP4XX_UART2_BASE_PHYS,
 149                 .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 150                 .irq            = IRQ_IXP4XX_UART2,
 151                 .flags          = UPF_BOOT_AUTOCONF,
 152                 .iotype         = UPIO_MEM,
 153                 .regshift       = 2,
 154                 .uartclk        = IXP4XX_UART_XTAL,
 155         },
 156         { }
 157 };
 158 
 159 static struct platform_device nas100d_uart = {
 160         .name                   = "serial8250",
 161         .id                     = PLAT8250_DEV_PLATFORM,
 162         .dev.platform_data      = nas100d_uart_data,
 163         .num_resources          = 2,
 164         .resource               = nas100d_uart_resources,
 165 };
 166 
 167 /* Built-in 10/100 Ethernet MAC interfaces */
 168 static struct eth_plat_info nas100d_plat_eth[] = {
 169         {
 170                 .phy            = 0,
 171                 .rxq            = 3,
 172                 .txreadyq       = 20,
 173         }
 174 };
 175 
 176 static struct platform_device nas100d_eth[] = {
 177         {
 178                 .name                   = "ixp4xx_eth",
 179                 .id                     = IXP4XX_ETH_NPEB,
 180                 .dev.platform_data      = nas100d_plat_eth,
 181         }
 182 };
 183 
 184 static struct platform_device *nas100d_devices[] __initdata = {
 185         &nas100d_i2c_gpio,
 186         &nas100d_flash,
 187         &nas100d_leds,
 188         &nas100d_eth[0],
 189 };
 190 
 191 static void nas100d_power_off(void)
 192 {
 193         /* This causes the box to drop the power and go dead. */
 194 
 195         /* enable the pwr cntl gpio and assert power off */
 196         gpio_direction_output(NAS100D_PO_GPIO, 1);
 197 }
 198 
 199 /* This is used to make sure the power-button pusher is serious.  The button
 200  * must be held until the value of this counter reaches zero.
 201  */
 202 static int power_button_countdown;
 203 
 204 /* Must hold the button down for at least this many counts to be processed */
 205 #define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
 206 
 207 static void nas100d_power_handler(struct timer_list *unused);
 208 static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler);
 209 
 210 static void nas100d_power_handler(struct timer_list *unused)
 211 {
 212         /* This routine is called twice per second to check the
 213          * state of the power button.
 214          */
 215 
 216         if (gpio_get_value(NAS100D_PB_GPIO)) {
 217 
 218                 /* IO Pin is 1 (button pushed) */
 219                 if (power_button_countdown > 0)
 220                         power_button_countdown--;
 221 
 222         } else {
 223 
 224                 /* Done on button release, to allow for auto-power-on mods. */
 225                 if (power_button_countdown == 0) {
 226                         /* Signal init to do the ctrlaltdel action,
 227                          * this will bypass init if it hasn't started
 228                          * and do a kernel_restart.
 229                          */
 230                         ctrl_alt_del();
 231 
 232                         /* Change the state of the power LED to "blink" */
 233                         gpio_set_value(NAS100D_LED_PWR_GPIO, 0);
 234                 } else {
 235                         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 236                 }
 237         }
 238 
 239         mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
 240 }
 241 
 242 static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
 243 {
 244         /* This is the paper-clip reset, it shuts the machine down directly. */
 245         machine_power_off();
 246 
 247         return IRQ_HANDLED;
 248 }
 249 
 250 static int __init nas100d_gpio_init(void)
 251 {
 252         if (!machine_is_nas100d())
 253                 return 0;
 254 
 255         /*
 256          * The power button on the Iomega NAS100d is on GPIO 14, but
 257          * it cannot handle interrupts on that GPIO line.  So we'll
 258          * have to poll it with a kernel timer.
 259          */
 260 
 261         /* Request the power off GPIO */
 262         gpio_request(NAS100D_PO_GPIO, "power off");
 263 
 264         /* Make sure that the power button GPIO is set up as an input */
 265         gpio_request(NAS100D_PB_GPIO, "power button");
 266         gpio_direction_input(NAS100D_PB_GPIO);
 267 
 268         /* Set the initial value for the power button IRQ handler */
 269         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 270 
 271         mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
 272 
 273         return 0;
 274 }
 275 device_initcall(nas100d_gpio_init);
 276 
 277 static void __init nas100d_init(void)
 278 {
 279         uint8_t __iomem *f;
 280         int i;
 281 
 282         ixp4xx_sys_init();
 283 
 284         nas100d_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 285         nas100d_flash_resource.end =
 286                 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 287 
 288         gpiod_add_lookup_table(&nas100d_i2c_gpiod_table);
 289         i2c_register_board_info(0, nas100d_i2c_board_info,
 290                                 ARRAY_SIZE(nas100d_i2c_board_info));
 291 
 292         /*
 293          * This is only useful on a modified machine, but it is valuable
 294          * to have it first in order to see debug messages, and so that
 295          * it does *not* get removed if platform_add_devices fails!
 296          */
 297         (void)platform_device_register(&nas100d_uart);
 298 
 299         platform_add_devices(nas100d_devices, ARRAY_SIZE(nas100d_devices));
 300 
 301         pm_power_off = nas100d_power_off;
 302 
 303         if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler,
 304                 IRQF_TRIGGER_LOW, "NAS100D reset button", NULL) < 0) {
 305 
 306                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 307                         gpio_to_irq(NAS100D_RB_GPIO));
 308         }
 309 
 310         /*
 311          * Map in a portion of the flash and read the MAC address.
 312          * Since it is stored in BE in the flash itself, we need to
 313          * byteswap it if we're in LE mode.
 314          */
 315         f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x1000000);
 316         if (f) {
 317                 for (i = 0; i < 6; i++)
 318 #ifdef __ARMEB__
 319                         nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + i);
 320 #else
 321                         nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + (i^3));
 322 #endif
 323                 iounmap(f);
 324         }
 325         printk(KERN_INFO "NAS100D: Using MAC address %pM for port 0\n",
 326                nas100d_plat_eth[0].hwaddr);
 327 
 328 }
 329 
 330 MACHINE_START(NAS100D, "Iomega NAS 100d")
 331         /* Maintainer: www.nslu2-linux.org */
 332         .atag_offset    = 0x100,
 333         .map_io         = ixp4xx_map_io,
 334         .init_early     = ixp4xx_init_early,
 335         .init_irq       = ixp4xx_init_irq,
 336         .init_time      = ixp4xx_timer_init,
 337         .init_machine   = nas100d_init,
 338 #if defined(CONFIG_PCI)
 339         .dma_zone_size  = SZ_64M,
 340 #endif
 341         .restart        = ixp4xx_restart,
 342 MACHINE_END
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