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 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 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 } 103 104 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