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 35 static 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 72 static 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 } 105 106 void __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