arch/xtensa/platforms/xt2000/setup.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * arch/xtensa/platforms/xt2000/setup.c
   4  *
   5  * Platform specific functions for the XT2000 board.
   6  *
   7  * Authors:     Chris Zankel <chris@zankel.net>
   8  *              Joe Taylor <joe@tensilica.com>
   9  *
  10  * Copyright 2001 - 2004 Tensilica Inc.
  11  */
  12 #include <linux/stddef.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/errno.h>
  16 #include <linux/reboot.h>
  17 #include <linux/kdev_t.h>
  18 #include <linux/types.h>
  19 #include <linux/major.h>
  20 #include <linux/console.h>
  21 #include <linux/delay.h>
  22 #include <linux/stringify.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/serial.h>
  25 #include <linux/serial_8250.h>
  26 #include <linux/timer.h>
  27
  28 #include <asm/processor.h>
  29 #include <asm/platform.h>
  30 #include <asm/bootparam.h>
  31 #include <platform/hardware.h>
  32 #include <platform/serial.h>
  33
  34 /* Assumes s points to an 8-chr string.  No checking for NULL. */
  35
  36 static void led_print (int f, char *s)
  37 {
  38         unsigned long* led_addr = (unsigned long*) (XT2000_LED_ADDR + 0xE0) + f;
  39         int i;
  40         for (i = f; i < 8; i++)
  41                 if ((*led_addr++ = *s++) == 0)
  42                     break;
  43 }
  44
  45 static int xt2000_power_off(struct sys_off_data *unused)
  46 {
  47         led_print (0, "POWEROFF");
  48         local_irq_disable();
  49         while (1);
  50         return NOTIFY_DONE;
  51 }
  52
  53 static int xt2000_restart(struct notifier_block *this,
  54                           unsigned long event, void *ptr)
  55 {
  56         /* Flush and reset the mmu, simulate a processor reset, and
  57          * jump to the reset vector. */
  58         cpu_reset();
  59
  60         return NOTIFY_DONE;
  61 }
  62
  63 static struct notifier_block xt2000_restart_block = {
  64         .notifier_call = xt2000_restart,
  65 };
  66
  67 void __init platform_setup(char** cmdline)
  68 {
  69         led_print (0, "LINUX   ");
  70 }
  71
  72 /* Heartbeat. Let the LED blink. */
  73
  74 static void xt2000_heartbeat(struct timer_list *unused);
  75
  76 static DEFINE_TIMER(heartbeat_timer, xt2000_heartbeat);
  77
  78 static void xt2000_heartbeat(struct timer_list *unused)
  79 {
  80         static int i;
  81
  82         led_print(7, i ? "." : " ");
  83         i ^= 1;
  84         mod_timer(&heartbeat_timer, jiffies + HZ / 2);
  85 }
  86
  87 //#define RS_TABLE_SIZE 2
  88
  89 #define _SERIAL_PORT(_base,_irq)                                        \
  90 {                                                                       \
  91         .mapbase        = (_base),                                      \
  92         .membase        = (void*)(_base),                               \
  93         .irq            = (_irq),                                       \
  94         .uartclk        = DUART16552_XTAL_FREQ,                         \
  95         .iotype         = UPIO_MEM,                                     \
  96         .flags          = UPF_BOOT_AUTOCONF,                            \
  97         .regshift       = 2,                                            \
  98 }
  99
 100 static struct plat_serial8250_port xt2000_serial_data[] = {
 101 #if XCHAL_HAVE_BE
 102         _SERIAL_PORT(DUART16552_1_ADDR + 3, DUART16552_1_INTNUM),
 103         _SERIAL_PORT(DUART16552_2_ADDR + 3, DUART16552_2_INTNUM),
 104 #else
 105         _SERIAL_PORT(DUART16552_1_ADDR, DUART16552_1_INTNUM),
 106         _SERIAL_PORT(DUART16552_2_ADDR, DUART16552_2_INTNUM),
 107 #endif
 108         { }
 109 };
 110
 111 static struct platform_device xt2000_serial8250_device = {
 112         .name           = "serial8250",
 113         .id             = PLAT8250_DEV_PLATFORM,
 114         .dev            = {
 115             .platform_data = xt2000_serial_data,
 116         },
 117 };
 118
 119 static struct resource xt2000_sonic_res[] = {
 120         {
 121                 .start = SONIC83934_ADDR,
 122                 .end   = SONIC83934_ADDR + 0xff,
 123                 .flags = IORESOURCE_MEM,
 124         },
 125         {
 126                 .start = SONIC83934_INTNUM,
 127                 .end = SONIC83934_INTNUM,
 128                 .flags = IORESOURCE_IRQ,
 129         },
 130 };
 131
 132 static struct platform_device xt2000_sonic_device = {
 133         .name           = "xtsonic",
 134         .num_resources  = ARRAY_SIZE(xt2000_sonic_res),
 135         .resource               = xt2000_sonic_res,
 136 };
 137
 138 static int __init xt2000_setup_devinit(void)
 139 {
 140         platform_device_register(&xt2000_serial8250_device);
 141         platform_device_register(&xt2000_sonic_device);
 142         mod_timer(&heartbeat_timer, jiffies + HZ / 2);
 143         register_restart_handler(&xt2000_restart_block);
 144         register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
 145                                  SYS_OFF_PRIO_DEFAULT,
 146                                  xt2000_power_off, NULL);
 147         return 0;
 148 }
 149
 150 device_initcall(xt2000_setup_devinit);