1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2000,2001,2002,2003,2004 Broadcom Corporation
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>
11 #include <asm/bootinfo.h>
13 #include <asm/mipsregs.h>
15 #include <asm/sibyte/sb1250.h>
17 #include <asm/sibyte/bcm1480_regs.h>
18 #include <asm/sibyte/bcm1480_scd.h>
19 #include <asm/sibyte/sb1250_scd.h>
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);
30 static unsigned int part_type;
33 static char *pass_str;
35 static int __init setup_bcm1x80_bcm1x55(void)
38 case K_SYS_REVISION_BCM1480_S0:
40 pass_str = "S0 (pass1)";
42 case K_SYS_REVISION_BCM1480_A1:
44 pass_str = "A1 (pass1)";
46 case K_SYS_REVISION_BCM1480_A2:
48 pass_str = "A2 (pass1)";
50 case K_SYS_REVISION_BCM1480_A3:
52 pass_str = "A3 (pass1)";
54 case K_SYS_REVISION_BCM1480_B0:
56 pass_str = "B0 (pass2)";
59 printk("Unknown %s rev %x\n", soc_str, soc_pass);
61 pass_str = "Unknown Revision";
68 /* Setup code likely to be common to all SiByte platforms */
70 static int __init sys_rev_decode(void)
75 case K_SYS_SOC_TYPE_BCM1x80:
76 if (part_type == K_SYS_PART_BCM1480)
78 else if (part_type == K_SYS_PART_BCM1280)
82 ret = setup_bcm1x80_bcm1x55();
85 case K_SYS_SOC_TYPE_BCM1x55:
86 if (part_type == K_SYS_PART_BCM1455)
88 else if (part_type == K_SYS_PART_BCM1255)
92 ret = setup_bcm1x80_bcm1x55();
96 printk("Unknown part type %x\n", part_type);
104 void __init bcm1480_setup(void)
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);
115 if (sys_rev_decode()) {
116 printk("Restart after failure to identify SiByte chip\n");
117 machine_restart(NULL);
120 plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
121 zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
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());