linux/arch/mips/sibyte/swarm/setup.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Copyright (C) 2000, 2001, 2002, 2003, 2004 Broadcom Corporation
   4 * Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
   5 */
   6
   7/*
   8 * Setup code for the SWARM board
   9 */
  10
  11#include <linux/spinlock.h>
  12#include <linux/mm.h>
  13#include <linux/memblock.h>
  14#include <linux/blkdev.h>
  15#include <linux/init.h>
  16#include <linux/kernel.h>
  17#include <linux/screen_info.h>
  18#include <linux/initrd.h>
  19
  20#include <asm/irq.h>
  21#include <asm/io.h>
  22#include <asm/bootinfo.h>
  23#include <asm/mipsregs.h>
  24#include <asm/reboot.h>
  25#include <asm/time.h>
  26#include <asm/traps.h>
  27#include <asm/sibyte/sb1250.h>
  28#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
  29#include <asm/sibyte/bcm1480_regs.h>
  30#elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
  31#include <asm/sibyte/sb1250_regs.h>
  32#else
  33#error invalid SiByte board configuration
  34#endif
  35#include <asm/sibyte/sb1250_genbus.h>
  36#include <asm/sibyte/board.h>
  37
  38#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
  39extern void bcm1480_setup(void);
  40#elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
  41extern void sb1250_setup(void);
  42#else
  43#error invalid SiByte board configuration
  44#endif
  45
  46extern int xicor_probe(void);
  47extern int xicor_set_time(time64_t);
  48extern time64_t xicor_get_time(void);
  49
  50extern int m41t81_probe(void);
  51extern int m41t81_set_time(time64_t);
  52extern time64_t m41t81_get_time(void);
  53
  54const char *get_system_type(void)
  55{
  56        return "SiByte " SIBYTE_BOARD_NAME;
  57}
  58
  59int swarm_be_handler(struct pt_regs *regs, int is_fixup)
  60{
  61        if (!is_fixup && (regs->cp0_cause & 4)) {
  62                /* Data bus error - print PA */
  63                printk("DBE physical address: %010Lx\n",
  64                       __read_64bit_c0_register($26, 1));
  65        }
  66        return is_fixup ? MIPS_BE_FIXUP : MIPS_BE_FATAL;
  67}
  68
  69enum swarm_rtc_type {
  70        RTC_NONE,
  71        RTC_XICOR,
  72        RTC_M41T81,
  73};
  74
  75enum swarm_rtc_type swarm_rtc_type;
  76
  77void read_persistent_clock64(struct timespec64 *ts)
  78{
  79        time64_t sec;
  80
  81        switch (swarm_rtc_type) {
  82        case RTC_XICOR:
  83                sec = xicor_get_time();
  84                break;
  85
  86        case RTC_M41T81:
  87                sec = m41t81_get_time();
  88                break;
  89
  90        case RTC_NONE:
  91        default:
  92                sec = mktime64(2000, 1, 1, 0, 0, 0);
  93                break;
  94        }
  95        ts->tv_sec = sec;
  96        ts->tv_nsec = 0;
  97}
  98
  99int update_persistent_clock64(struct timespec64 now)
 100{
 101        time64_t sec = now.tv_sec;
 102
 103        switch (swarm_rtc_type) {
 104        case RTC_XICOR:
 105                return xicor_set_time(sec);
 106
 107        case RTC_M41T81:
 108                return m41t81_set_time(sec);
 109
 110        case RTC_NONE:
 111        default:
 112                return -1;
 113        }
 114}
 115
 116void __init plat_mem_setup(void)
 117{
 118#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
 119        bcm1480_setup();
 120#elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
 121        sb1250_setup();
 122#else
 123#error invalid SiByte board configuration
 124#endif
 125
 126        board_be_handler = swarm_be_handler;
 127
 128        if (xicor_probe())
 129                swarm_rtc_type = RTC_XICOR;
 130        if (m41t81_probe())
 131                swarm_rtc_type = RTC_M41T81;
 132
 133#ifdef CONFIG_VT
 134        screen_info = (struct screen_info) {
 135                .orig_video_page        = 52,
 136                .orig_video_mode        = 3,
 137                .orig_video_cols        = 80,
 138                .flags                  = 12,
 139                .orig_video_ega_bx      = 3,
 140                .orig_video_lines       = 25,
 141                .orig_video_isVGA       = 0x22,
 142                .orig_video_points      = 16,
 143       };
 144       /* XXXKW for CFE, get lines/cols from environment */
 145#endif
 146}
 147
 148#ifdef LEDS_PHYS
 149
 150#ifdef CONFIG_SIBYTE_CARMEL
 151/* XXXKW need to detect Monterey/LittleSur/etc */
 152#undef LEDS_PHYS
 153#define LEDS_PHYS MLEDS_PHYS
 154#endif
 155
 156void setleds(char *str)
 157{
 158        void *reg;
 159        int i;
 160
 161        for (i = 0; i < 4; i++) {
 162                reg = IOADDR(LEDS_PHYS) + 0x20 + ((3 - i) << 3);
 163
 164                if (!str[i])
 165                        writeb(' ', reg);
 166                else
 167                        writeb(str[i], reg);
 168        }
 169}
 170
 171#endif /* LEDS_PHYS */
 172