1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2000,2001,2002,2003,2004 Broadcom Corporation
4 */
5#include <linux/init.h>
6#include <linux/kernel.h>
7#include <linux/export.h>
8#include <linux/reboot.h>
9#include <linux/string.h>
10
11#include <asm/bootinfo.h>
12#include <asm/cpu.h>
13#include <asm/mipsregs.h>
14#include <asm/io.h>
15#include <asm/sibyte/sb1250.h>
16
17#include <asm/sibyte/bcm1480_regs.h>
18#include <asm/sibyte/bcm1480_scd.h>
19#include <asm/sibyte/sb1250_scd.h>
20
21unsigned int sb1_pass;
22unsigned int soc_pass;
23unsigned int soc_type;
24EXPORT_SYMBOL(soc_type);
25unsigned int periph_rev;
26EXPORT_SYMBOL_GPL(periph_rev);
27unsigned int zbbus_mhz;
28EXPORT_SYMBOL(zbbus_mhz);
29
30static unsigned int part_type;
31
32static char *soc_str;
33static char *pass_str;
34
35static int __init setup_bcm1x80_bcm1x55(void)
36{
37	int ret = 0;
38
39	switch (soc_pass) {
40	case K_SYS_REVISION_BCM1480_S0:
41		periph_rev = 1;
42		pass_str = "S0 (pass1)";
43		break;
44	case K_SYS_REVISION_BCM1480_A1:
45		periph_rev = 1;
46		pass_str = "A1 (pass1)";
47		break;
48	case K_SYS_REVISION_BCM1480_A2:
49		periph_rev = 1;
50		pass_str = "A2 (pass1)";
51		break;
52	case K_SYS_REVISION_BCM1480_A3:
53		periph_rev = 1;
54		pass_str = "A3 (pass1)";
55		break;
56	case K_SYS_REVISION_BCM1480_B0:
57		periph_rev = 1;
58		pass_str = "B0 (pass2)";
59		break;
60	default:
61		printk("Unknown %s rev %x\n", soc_str, soc_pass);
62		periph_rev = 1;
63		pass_str = "Unknown Revision";
64		break;
65	}
66
67	return ret;
68}
69
70/* Setup code likely to be common to all SiByte platforms */
71
72static int __init sys_rev_decode(void)
73{
74	int ret = 0;
75
76	switch (soc_type) {
77	case K_SYS_SOC_TYPE_BCM1x80:
78		if (part_type == K_SYS_PART_BCM1480)
79		    soc_str = "BCM1480";
80		else if (part_type == K_SYS_PART_BCM1280)
81		    soc_str = "BCM1280";
82		else
83		    soc_str = "BCM1x80";
84		ret = setup_bcm1x80_bcm1x55();
85		break;
86
87	case K_SYS_SOC_TYPE_BCM1x55:
88		if (part_type == K_SYS_PART_BCM1455)
89		    soc_str = "BCM1455";
90		else if (part_type == K_SYS_PART_BCM1255)
91		    soc_str = "BCM1255";
92		else
93		    soc_str = "BCM1x55";
94		ret = setup_bcm1x80_bcm1x55();
95		break;
96
97	default:
98		printk("Unknown part type %x\n", part_type);
99		ret = 1;
100		break;
101	}
102
103	return ret;
104}
105
106void __init bcm1480_setup(void)
107{
108	uint64_t sys_rev;
109	int plldiv;
110
111	sb1_pass = read_c0_prid() & PRID_REV_MASK;
112	sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
113	soc_type = SYS_SOC_TYPE(sys_rev);
114	part_type = G_SYS_PART(sys_rev);
115	soc_pass = G_SYS_REVISION(sys_rev);
116
117	if (sys_rev_decode()) {
118		printk("Restart after failure to identify SiByte chip\n");
119		machine_restart(NULL);
120	}
121
122	plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
123	zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
124
125	printk("Broadcom SiByte %s %s @ %d MHz (SB-1A rev %d)\n",
126		    soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
127	printk("Board type: %s\n", get_system_type());
128}
129