kernel/arch/xtensa/platforms/xt2000/setup.c

   1 /*
   2  * arch/xtensa/platforms/xt2000/setup.c
   3  *
   4  * Platform specific functions for the XT2000 board.
   5  *
   6  * Authors:     Chris Zankel <chris@zankel.net>
   7  *              Joe Taylor <joe@tensilica.com>
   8  *
   9  * Copyright 2001 - 2004 Tensilica Inc.
  10  *
  11  * This program is free software; you can redistribute  it and/or modify it
  12  * under  the terms of  the GNU General  Public License as published by the
  13  * Free Software Foundation;  either version 2 of the  License, or (at your
  14  * option) any later version.
  15  *
  16  */
  17 #include <linux/stddef.h>
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/errno.h>
  21 #include <linux/reboot.h>
  22 #include <linux/kdev_t.h>
  23 #include <linux/types.h>
  24 #include <linux/major.h>
  25 #include <linux/console.h>
  26 #include <linux/delay.h>
  27 #include <linux/stringify.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/serial.h>
  30 #include <linux/serial_8250.h>
  31
  32 #include <asm/processor.h>
  33 #include <asm/platform.h>
  34 #include <asm/bootparam.h>
  35 #include <platform/hardware.h>
  36 #include <platform/serial.h>
  37
  38 /* Assumes s points to an 8-chr string.  No checking for NULL. */
  39
  40 static void led_print (int f, char *s)
  41 {
  42         unsigned long* led_addr = (unsigned long*) (XT2000_LED_ADDR + 0xE0) + f;
  43         int i;
  44         for (i = f; i < 8; i++)
  45                 if ((*led_addr++ = *s++) == 0)
  46                     break;
  47 }
  48
  49 void platform_halt(void)
  50 {
  51         led_print (0, "  HALT  ");
  52         local_irq_disable();
  53         while (1);
  54 }
  55
  56 void platform_power_off(void)
  57 {
  58         led_print (0, "POWEROFF");
  59         local_irq_disable();
  60         while (1);
  61 }
  62
  63 void platform_restart(void)
  64 {
  65         /* Flush and reset the mmu, simulate a processor reset, and
  66          * jump to the reset vector. */
  67
  68         __asm__ __volatile__ ("movi     a2, 15\n\t"
  69                               "wsr      a2, icountlevel\n\t"
  70                               "movi     a2, 0\n\t"
  71                               "wsr      a2, icount\n\t"
  72 #if XCHAL_NUM_IBREAK > 0
  73                               "wsr      a2, ibreakenable\n\t"
  74 #endif
  75                               "wsr      a2, lcount\n\t"
  76                               "movi     a2, 0x1f\n\t"
  77                               "wsr      a2, ps\n\t"
  78                               "isync\n\t"
  79                               "jx       %0\n\t"
  80                               :
  81                               : "a" (XCHAL_RESET_VECTOR_VADDR)
  82                               : "a2"
  83                               );
  84
  85         /* control never gets here */
  86 }
  87
  88 void __init platform_setup(char** cmdline)
  89 {
  90         led_print (0, "LINUX   ");
  91 }
  92
  93 /* early initialization */
  94
  95 void __init platform_init(bp_tag_t *first)
  96 {
  97 }
  98
  99 /* Heartbeat. Let the LED blink. */
 100
 101 void platform_heartbeat(void)
 102 {
 103         static int i=0, t = 0;
 104
 105         if (--t < 0)
 106         {
 107                 t = 59;
 108                 led_print(7, i ? ".": " ");
 109                 i ^= 1;
 110         }
 111 }
 112
 113 //#define RS_TABLE_SIZE 2
 114 //#define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF|ASYNC_SKIP_TEST)
 115
 116 #define _SERIAL_PORT(_base,_irq)                                        \
 117 {                                                                       \
 118         .mapbase        = (_base),                                      \
 119         .membase        = (void*)(_base),                               \
 120         .irq            = (_irq),                                       \
 121         .uartclk        = DUART16552_XTAL_FREQ,                         \
 122         .iotype         = UPIO_MEM,                                     \
 123         .flags          = UPF_BOOT_AUTOCONF,                            \
 124         .regshift       = 2,                                            \
 125 }
 126
 127 static struct plat_serial8250_port xt2000_serial_data[] = {
 128 #if XCHAL_HAVE_BE
 129         _SERIAL_PORT(DUART16552_1_ADDR + 3, DUART16552_1_INTNUM),
 130         _SERIAL_PORT(DUART16552_2_ADDR + 3, DUART16552_2_INTNUM),
 131 #else
 132         _SERIAL_PORT(DUART16552_1_ADDR, DUART16552_1_INTNUM),
 133         _SERIAL_PORT(DUART16552_2_ADDR, DUART16552_2_INTNUM),
 134 #endif
 135         { }
 136 };
 137
 138 static struct platform_device xt2000_serial8250_device = {
 139         .name           = "serial8250",
 140         .id             = PLAT8250_DEV_PLATFORM,
 141         .dev            = {
 142             .platform_data = xt2000_serial_data,
 143         },
 144 };
 145
 146 static struct resource xt2000_sonic_res[] = {
 147         {
 148                 .start = SONIC83934_ADDR,
 149                 .end   = SONIC83934_ADDR + 0xff,
 150                 .flags = IORESOURCE_MEM,
 151         },
 152         {
 153                 .start = SONIC83934_INTNUM,
 154                 .end = SONIC83934_INTNUM,
 155                 .flags = IORESOURCE_IRQ,
 156         },
 157 };
 158
 159 static struct platform_device xt2000_sonic_device = {
 160         .name           = "xtsonic",
 161         .num_resources  = ARRAY_SIZE(xt2000_sonic_res),
 162         .resource               = xt2000_sonic_res,
 163 };
 164
 165 static int __init xt2000_setup_devinit(void)
 166 {
 167         platform_device_register(&xt2000_serial8250_device);
 168         platform_device_register(&xt2000_sonic_device);
 169
 170         return 0;
 171 }
 172
 173 device_initcall(xt2000_setup_devinit);