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
21 unsigned int sb1_pass;
22 unsigned int soc_pass;
23 unsigned int soc_type;
24 EXPORT_SYMBOL(soc_type);
25 unsigned int periph_rev;
26 EXPORT_SYMBOL_GPL(periph_rev);
27 unsigned int zbbus_mhz;
28 EXPORT_SYMBOL(zbbus_mhz);
29
30 static unsigned int part_type;
31
32 static char *soc_str;
33 static char *pass_str;
34
setup_bcm1x80_bcm1x55(void)35 static 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
sys_rev_decode(void)70 static 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
bcm1480_setup(void)104 void __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