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 unsigned int zbbus_mhz; 40 EXPORT_SYMBOL(zbbus_mhz); 41 42 static unsigned int part_type; 43 44 static char *soc_str; 45 static char *pass_str; 46 47 static int __init setup_bcm1x80_bcm1x55(void) 48 { 49 int ret = 0; 50 51 switch (soc_pass) { 52 case K_SYS_REVISION_BCM1480_S0: 53 periph_rev = 1; 54 pass_str = "S0 (pass1)"; 55 break; 56 case K_SYS_REVISION_BCM1480_A1: 57 periph_rev = 1; 58 pass_str = "A1 (pass1)"; 59 break; 60 case K_SYS_REVISION_BCM1480_A2: 61 periph_rev = 1; 62 pass_str = "A2 (pass1)"; 63 break; 64 case K_SYS_REVISION_BCM1480_A3: 65 periph_rev = 1; 66 pass_str = "A3 (pass1)"; 67 break; 68 case K_SYS_REVISION_BCM1480_B0: 69 periph_rev = 1; 70 pass_str = "B0 (pass2)"; 71 break; 72 default: 73 printk("Unknown %s rev %x\n", soc_str, soc_pass); 74 periph_rev = 1; 75 pass_str = "Unknown Revision"; 76 break; 77 } 78 79 return ret; 80 } 81 82 /* Setup code likely to be common to all SiByte platforms */ 83 84 static int __init sys_rev_decode(void) 85 { 86 int ret = 0; 87 88 switch (soc_type) { 89 case K_SYS_SOC_TYPE_BCM1x80: 90 if (part_type == K_SYS_PART_BCM1480) 91 soc_str = "BCM1480"; 92 else if (part_type == K_SYS_PART_BCM1280) 93 soc_str = "BCM1280"; 94 else 95 soc_str = "BCM1x80"; 96 ret = setup_bcm1x80_bcm1x55(); 97 break; 98 99 case K_SYS_SOC_TYPE_BCM1x55: 100 if (part_type == K_SYS_PART_BCM1455) 101 soc_str = "BCM1455"; 102 else if (part_type == K_SYS_PART_BCM1255) 103 soc_str = "BCM1255"; 104 else 105 soc_str = "BCM1x55"; 106 ret = setup_bcm1x80_bcm1x55(); 107 break; 108 109 default: 110 printk("Unknown part type %x\n", part_type); 111 ret = 1; 112 break; 113 } 114 115 return ret; 116 } 117 118 void __init bcm1480_setup(void) 119 { 120 uint64_t sys_rev; 121 int plldiv; 122 123 sb1_pass = read_c0_prid() & PRID_REV_MASK; 124 sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION)); 125 soc_type = SYS_SOC_TYPE(sys_rev); 126 part_type = G_SYS_PART(sys_rev); 127 soc_pass = G_SYS_REVISION(sys_rev); 128 129 if (sys_rev_decode()) { 130 printk("Restart after failure to identify SiByte chip\n"); 131 machine_restart(NULL); 132 } 133 134 plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG))); 135 zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25); 136 137 printk("Broadcom SiByte %s %s @ %d MHz (SB-1A rev %d)\n", 138 soc_str, pass_str, zbbus_mhz * 2, sb1_pass); 139 printk("Board type: %s\n", get_system_type()); 140 } 141