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	switch (soc_pass) {
38	case K_SYS_REVISION_BCM1480_S0:
39		periph_rev = 1;
40		pass_str = "S0 (pass1)";
41		break;
42	case K_SYS_REVISION_BCM1480_A1:
43		periph_rev = 1;
44		pass_str = "A1 (pass1)";
45		break;
46	case K_SYS_REVISION_BCM1480_A2:
47		periph_rev = 1;
48		pass_str = "A2 (pass1)";
49		break;
50	case K_SYS_REVISION_BCM1480_A3:
51		periph_rev = 1;
52		pass_str = "A3 (pass1)";
53		break;
54	case K_SYS_REVISION_BCM1480_B0:
55		periph_rev = 1;
56		pass_str = "B0 (pass2)";
57		break;
58	default:
59		printk("Unknown %s rev %x\n", soc_str, soc_pass);
60		periph_rev = 1;
61		pass_str = "Unknown Revision";
62		break;
63	}
64
65	return 0;
66}
67
68/* Setup code likely to be common to all SiByte platforms */
69
70static int __init sys_rev_decode(void)
71{
72	int ret = 0;
73
74	switch (soc_type) {
75	case K_SYS_SOC_TYPE_BCM1x80:
76		if (part_type == K_SYS_PART_BCM1480)
77		    soc_str = "BCM1480";
78		else if (part_type == K_SYS_PART_BCM1280)
79		    soc_str = "BCM1280";
80		else
81		    soc_str = "BCM1x80";
82		ret = setup_bcm1x80_bcm1x55();
83		break;
84
85	case K_SYS_SOC_TYPE_BCM1x55:
86		if (part_type == K_SYS_PART_BCM1455)
87		    soc_str = "BCM1455";
88		else if (part_type == K_SYS_PART_BCM1255)
89		    soc_str = "BCM1255";
90		else
91		    soc_str = "BCM1x55";
92		ret = setup_bcm1x80_bcm1x55();
93		break;
94
95	default:
96		printk("Unknown part type %x\n", part_type);
97		ret = 1;
98		break;
99	}
100
101	return ret;
102}
103
104void __init bcm1480_setup(void)
105{
106	uint64_t sys_rev;
107	int plldiv;
108
109	sb1_pass = read_c0_prid() & PRID_REV_MASK;
110	sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
111	soc_type = SYS_SOC_TYPE(sys_rev);
112	part_type = G_SYS_PART(sys_rev);
113	soc_pass = G_SYS_REVISION(sys_rev);
114
115	if (sys_rev_decode()) {
116		printk("Restart after failure to identify SiByte chip\n");
117		machine_restart(NULL);
118	}
119
120	plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
121	zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
122
123	printk("Broadcom SiByte %s %s @ %d MHz (SB-1A rev %d)\n",
124		    soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
125	printk("Board type: %s\n", get_system_type());
126}
127