1 /* 2 * Copyright (C) 2000,2001,2002,2003,2004 Broadcom Corporation 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 2 7 * of the License, or (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 17 */ 18 #include <linux/init.h> 19 #include <linux/kernel.h> 20 #include <linux/export.h> 21 #include <linux/reboot.h> 22 #include <linux/string.h> 23 24 #include <asm/bootinfo.h> 25 #include <asm/cpu.h> 26 #include <asm/mipsregs.h> 27 #include <asm/io.h> 28 #include <asm/sibyte/sb1250.h> 29 30 #include <asm/sibyte/bcm1480_regs.h> 31 #include <asm/sibyte/bcm1480_scd.h> 32 #include <asm/sibyte/sb1250_scd.h> 33 34 unsigned int sb1_pass; 35 unsigned int soc_pass; 36 unsigned int soc_type; 37 EXPORT_SYMBOL(soc_type); 38 unsigned int periph_rev; 39 EXPORT_SYMBOL_GPL(periph_rev); 40 unsigned int zbbus_mhz; 41 EXPORT_SYMBOL(zbbus_mhz); 42 43 static unsigned int part_type; 44 45 static char *soc_str; 46 static char *pass_str; 47 48 static int __init setup_bcm1x80_bcm1x55(void) 49 { 50 int ret = 0; 51 52 switch (soc_pass) { 53 case K_SYS_REVISION_BCM1480_S0: 54 periph_rev = 1; 55 pass_str = "S0 (pass1)"; 56 break; 57 case K_SYS_REVISION_BCM1480_A1: 58 periph_rev = 1; 59 pass_str = "A1 (pass1)"; 60 break; 61 case K_SYS_REVISION_BCM1480_A2: 62 periph_rev = 1; 63 pass_str = "A2 (pass1)"; 64 break; 65 case K_SYS_REVISION_BCM1480_A3: 66 periph_rev = 1; 67 pass_str = "A3 (pass1)"; 68 break; 69 case K_SYS_REVISION_BCM1480_B0: 70 periph_rev = 1; 71 pass_str = "B0 (pass2)"; 72 break; 73 default: 74 printk("Unknown %s rev %x\n", soc_str, soc_pass); 75 periph_rev = 1; 76 pass_str = "Unknown Revision"; 77 break; 78 } 79 80 return ret; 81 } 82 83 /* Setup code likely to be common to all SiByte platforms */ 84 85 static int __init sys_rev_decode(void) 86 { 87 int ret = 0; 88 89 switch (soc_type) { 90 case K_SYS_SOC_TYPE_BCM1x80: 91 if (part_type == K_SYS_PART_BCM1480) 92 soc_str = "BCM1480"; 93 else if (part_type == K_SYS_PART_BCM1280) 94 soc_str = "BCM1280"; 95 else 96 soc_str = "BCM1x80"; 97 ret = setup_bcm1x80_bcm1x55(); 98 break; 99 100 case K_SYS_SOC_TYPE_BCM1x55: 101 if (part_type == K_SYS_PART_BCM1455) 102 soc_str = "BCM1455"; 103 else if (part_type == K_SYS_PART_BCM1255) 104 soc_str = "BCM1255"; 105 else 106 soc_str = "BCM1x55"; 107 ret = setup_bcm1x80_bcm1x55(); 108 break; 109 110 default: 111 printk("Unknown part type %x\n", part_type); 112 ret = 1; 113 break; 114 } 115 116 return ret; 117 } 118 119 void __init bcm1480_setup(void) 120 { 121 uint64_t sys_rev; 122 int plldiv; 123 124 sb1_pass = read_c0_prid() & PRID_REV_MASK; 125 sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION)); 126 soc_type = SYS_SOC_TYPE(sys_rev); 127 part_type = G_SYS_PART(sys_rev); 128 soc_pass = G_SYS_REVISION(sys_rev); 129 130 if (sys_rev_decode()) { 131 printk("Restart after failure to identify SiByte chip\n"); 132 machine_restart(NULL); 133 } 134 135 plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG))); 136 zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25); 137 138 printk("Broadcom SiByte %s %s @ %d MHz (SB-1A rev %d)\n", 139 soc_str, pass_str, zbbus_mhz * 2, sb1_pass); 140 printk("Board type: %s\n", get_system_type()); 141 } 142