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)
39 extern void bcm1480_setup(void);
40 #elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
41 extern void sb1250_setup(void);
42 #else
43 #error invalid SiByte board configuration
44 #endif
45
46 extern int xicor_probe(void);
47 extern int xicor_set_time(time64_t);
48 extern time64_t xicor_get_time(void);
49
50 extern int m41t81_probe(void);
51 extern int m41t81_set_time(time64_t);
52 extern time64_t m41t81_get_time(void);
53
get_system_type(void)54 const char *get_system_type(void)
55 {
56 return "SiByte " SIBYTE_BOARD_NAME;
57 }
58
swarm_be_handler(struct pt_regs * regs,int is_fixup)59 int 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
69 enum swarm_rtc_type {
70 RTC_NONE,
71 RTC_XICOR,
72 RTC_M41T81,
73 };
74
75 enum swarm_rtc_type swarm_rtc_type;
76
read_persistent_clock64(struct timespec64 * ts)77 void 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
update_persistent_clock64(struct timespec64 now)99 int 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
plat_mem_setup(void)116 void __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
setleds(char * str)156 void 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
