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/module.h> 21 #include <linux/reboot.h> 22 #include <linux/string.h> 23 24 #include <asm/bootinfo.h> 25 #include <asm/mipsregs.h> 26 #include <asm/io.h> 27 #include <asm/sibyte/sb1250.h> 28 29 #include <asm/sibyte/bcm1480_regs.h> 30 #include <asm/sibyte/bcm1480_scd.h> 31 #include <asm/sibyte/sb1250_scd.h> 32 33 unsigned int sb1_pass; 34 unsigned int soc_pass; 35 unsigned int soc_type; 36 EXPORT_SYMBOL(soc_type); 37 unsigned int periph_rev; 38 unsigned int zbbus_mhz; 39 EXPORT_SYMBOL(zbbus_mhz); 40 41 static unsigned int part_type; 42 43 static char *soc_str; 44 static char *pass_str; 45 46 static int __init setup_bcm1x80_bcm1x55(void) 47 { 48 int ret = 0; 49 50 switch (soc_pass) { 51 case K_SYS_REVISION_BCM1480_S0: 52 periph_rev = 1; 53 pass_str = "S0 (pass1)"; 54 break; 55 case K_SYS_REVISION_BCM1480_A1: 56 periph_rev = 1; 57 pass_str = "A1 (pass1)"; 58 break; 59 case K_SYS_REVISION_BCM1480_A2: 60 periph_rev = 1; 61 pass_str = "A2 (pass1)"; 62 break; 63 case K_SYS_REVISION_BCM1480_A3: 64 periph_rev = 1; 65 pass_str = "A3 (pass1)"; 66 break; 67 case K_SYS_REVISION_BCM1480_B0: 68 periph_rev = 1; 69 pass_str = "B0 (pass2)"; 70 break; 71 default: 72 printk("Unknown %s rev %x\n", soc_str, soc_pass); 73 periph_rev = 1; 74 pass_str = "Unknown Revision"; 75 break; 76 } 77 78 return ret; 79 } 80 81 /* Setup code likely to be common to all SiByte platforms */ 82 83 static int __init sys_rev_decode(void) 84 { 85 int ret = 0; 86 87 switch (soc_type) { 88 case K_SYS_SOC_TYPE_BCM1x80: 89 if (part_type == K_SYS_PART_BCM1480) 90 soc_str = "BCM1480"; 91 else if (part_type == K_SYS_PART_BCM1280) 92 soc_str = "BCM1280"; 93 else 94 soc_str = "BCM1x80"; 95 ret = setup_bcm1x80_bcm1x55(); 96 break; 97 98 case K_SYS_SOC_TYPE_BCM1x55: 99 if (part_type == K_SYS_PART_BCM1455) 100 soc_str = "BCM1455"; 101 else if (part_type == K_SYS_PART_BCM1255) 102 soc_str = "BCM1255"; 103 else 104 soc_str = "BCM1x55"; 105 ret = setup_bcm1x80_bcm1x55(); 106 break; 107 108 default: 109 printk("Unknown part type %x\n", part_type); 110 ret = 1; 111 break; 112 } 113 114 return ret; 115 } 116 117 void __init bcm1480_setup(void) 118 { 119 uint64_t sys_rev; 120 int plldiv; 121 122 sb1_pass = read_c0_prid() & 0xff; 123 sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION)); 124 soc_type = SYS_SOC_TYPE(sys_rev); 125 part_type = G_SYS_PART(sys_rev); 126 soc_pass = G_SYS_REVISION(sys_rev); 127 128 if (sys_rev_decode()) { 129 printk("Restart after failure to identify SiByte chip\n"); 130 machine_restart(NULL); 131 } 132 133 plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG))); 134 zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25); 135 136 printk("Broadcom SiByte %s %s @ %d MHz (SB-1A rev %d)\n", 137 soc_str, pass_str, zbbus_mhz * 2, sb1_pass); 138 printk("Board type: %s\n", get_system_type()); 139 } 140