sibyte/swarm/setup.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Copyright (C) 2000, 2001, 2002, 2003, 2004 Broadcom Corporation
0004  * Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
0005  */
0006
0007 /*
0008  * Setup code for the SWARM board
0009  */
0010
0011 #include <linux/spinlock.h>
0012 #include <linux/mm.h>
0013 #include <linux/memblock.h>
0014 #include <linux/init.h>
0015 #include <linux/kernel.h>
0016 #include <linux/screen_info.h>
0017 #include <linux/initrd.h>
0018
0019 #include <asm/irq.h>
0020 #include <asm/io.h>
0021 #include <asm/bootinfo.h>
0022 #include <asm/mipsregs.h>
0023 #include <asm/reboot.h>
0024 #include <asm/time.h>
0025 #include <asm/traps.h>
0026 #include <asm/sibyte/sb1250.h>
0027 #if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
0028 #include <asm/sibyte/bcm1480_regs.h>
0029 #elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
0030 #include <asm/sibyte/sb1250_regs.h>
0031 #else
0032 #error invalid SiByte board configuration
0033 #endif
0034 #include <asm/sibyte/sb1250_genbus.h>
0035 #include <asm/sibyte/board.h>
0036
0037 #if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
0038 extern void bcm1480_setup(void);
0039 #elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
0040 extern void sb1250_setup(void);
0041 #else
0042 #error invalid SiByte board configuration
0043 #endif
0044
0045 extern int xicor_probe(void);
0046 extern int xicor_set_time(time64_t);
0047 extern time64_t xicor_get_time(void);
0048
0049 extern int m41t81_probe(void);
0050 extern int m41t81_set_time(time64_t);
0051 extern time64_t m41t81_get_time(void);
0052
0053 const char *get_system_type(void)
0054 {
0055     return "SiByte " SIBYTE_BOARD_NAME;
0056 }
0057
0058 int swarm_be_handler(struct pt_regs *regs, int is_fixup)
0059 {
0060     if (!is_fixup && (regs->cp0_cause & 4)) {
0061         /* Data bus error - print PA */
0062         printk("DBE physical address: %010Lx\n",
0063                __read_64bit_c0_register($26, 1));
0064     }
0065     return is_fixup ? MIPS_BE_FIXUP : MIPS_BE_FATAL;
0066 }
0067
0068 enum swarm_rtc_type {
0069     RTC_NONE,
0070     RTC_XICOR,
0071     RTC_M41T81,
0072 };
0073
0074 enum swarm_rtc_type swarm_rtc_type;
0075
0076 void read_persistent_clock64(struct timespec64 *ts)
0077 {
0078     time64_t sec;
0079
0080     switch (swarm_rtc_type) {
0081     case RTC_XICOR:
0082         sec = xicor_get_time();
0083         break;
0084
0085     case RTC_M41T81:
0086         sec = m41t81_get_time();
0087         break;
0088
0089     case RTC_NONE:
0090     default:
0091         sec = mktime64(2000, 1, 1, 0, 0, 0);
0092         break;
0093     }
0094     ts->tv_sec = sec;
0095     ts->tv_nsec = 0;
0096 }
0097
0098 int update_persistent_clock64(struct timespec64 now)
0099 {
0100     time64_t sec = now.tv_sec;
0101
0102     switch (swarm_rtc_type) {
0103     case RTC_XICOR:
0104         return xicor_set_time(sec);
0105
0106     case RTC_M41T81:
0107         return m41t81_set_time(sec);
0108
0109     case RTC_NONE:
0110     default:
0111         return -1;
0112     }
0113 }
0114
0115 void __init plat_mem_setup(void)
0116 {
0117 #if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
0118     bcm1480_setup();
0119 #elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
0120     sb1250_setup();
0121 #else
0122 #error invalid SiByte board configuration
0123 #endif
0124
0125     mips_set_be_handler(swarm_be_handler);
0126
0127     if (xicor_probe())
0128         swarm_rtc_type = RTC_XICOR;
0129     if (m41t81_probe())
0130         swarm_rtc_type = RTC_M41T81;
0131
0132 #ifdef CONFIG_VT
0133     screen_info = (struct screen_info) {
0134         .orig_video_page    = 52,
0135         .orig_video_mode    = 3,
0136         .orig_video_cols    = 80,
0137         .flags          = 12,
0138         .orig_video_ega_bx  = 3,
0139         .orig_video_lines   = 25,
0140         .orig_video_isVGA   = 0x22,
0141         .orig_video_points  = 16,
0142        };
0143        /* XXXKW for CFE, get lines/cols from environment */
0144 #endif
0145 }
0146
0147 #ifdef LEDS_PHYS
0148
0149 #ifdef CONFIG_SIBYTE_CARMEL
0150 /* XXXKW need to detect Monterey/LittleSur/etc */
0151 #undef LEDS_PHYS
0152 #define LEDS_PHYS MLEDS_PHYS
0153 #endif
0154
0155 void setleds(char *str)
0156 {
0157     void *reg;
0158     int i;
0159
0160     for (i = 0; i < 4; i++) {
0161         reg = IOADDR(LEDS_PHYS) + 0x20 + ((3 - i) << 3);
0162
0163         if (!str[i])
0164             writeb(' ', reg);
0165         else
0166             writeb(str[i], reg);
0167     }
0168 }
0169
0170 #endif /* LEDS_PHYS */