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