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/kernel.h> 19 #include <linux/module.h> 20 #include <linux/reboot.h> 21 #include <linux/string.h> 22 23 #include <asm/bootinfo.h> 24 #include <asm/mipsregs.h> 25 #include <asm/io.h> 26 #include <asm/sibyte/sb1250.h> 27 28 #include <asm/sibyte/bcm1480_regs.h> 29 #include <asm/sibyte/bcm1480_scd.h> 30 #include <asm/sibyte/sb1250_scd.h> 31 32 unsigned int sb1_pass; 33 unsigned int soc_pass; 34 unsigned int soc_type; 35 EXPORT_SYMBOL(soc_type); 36 unsigned int periph_rev; 37 unsigned int zbbus_mhz; 38 39 static unsigned int part_type; 40 41 static char *soc_str; 42 static char *pass_str; 43 44 static inline int setup_bcm1x80_bcm1x55(void); 45 46 /* Setup code likely to be common to all SiByte platforms */ 47 48 static inline int sys_rev_decode(void) 49 { 50 int ret = 0; 51 52 switch (soc_type) { 53 case K_SYS_SOC_TYPE_BCM1x80: 54 if (part_type == K_SYS_PART_BCM1480) 55 soc_str = "BCM1480"; 56 else if (part_type == K_SYS_PART_BCM1280) 57 soc_str = "BCM1280"; 58 else 59 soc_str = "BCM1x80"; 60 ret = setup_bcm1x80_bcm1x55(); 61 break; 62 63 case K_SYS_SOC_TYPE_BCM1x55: 64 if (part_type == K_SYS_PART_BCM1455) 65 soc_str = "BCM1455"; 66 else if (part_type == K_SYS_PART_BCM1255) 67 soc_str = "BCM1255"; 68 else 69 soc_str = "BCM1x55"; 70 ret = setup_bcm1x80_bcm1x55(); 71 break; 72 73 default: 74 printk("Unknown part type %x\n", part_type); 75 ret = 1; 76 break; 77 } 78 return ret; 79 } 80 81 static inline int setup_bcm1x80_bcm1x55(void) 82 { 83 int ret = 0; 84 85 switch (soc_pass) { 86 case K_SYS_REVISION_BCM1480_S0: 87 periph_rev = 1; 88 pass_str = "S0 (pass1)"; 89 break; 90 case K_SYS_REVISION_BCM1480_A1: 91 periph_rev = 1; 92 pass_str = "A1 (pass1)"; 93 break; 94 case K_SYS_REVISION_BCM1480_A2: 95 periph_rev = 1; 96 pass_str = "A2 (pass1)"; 97 break; 98 case K_SYS_REVISION_BCM1480_A3: 99 periph_rev = 1; 100 pass_str = "A3 (pass1)"; 101 break; 102 case K_SYS_REVISION_BCM1480_B0: 103 periph_rev = 1; 104 pass_str = "B0 (pass2)"; 105 break; 106 default: 107 printk("Unknown %s rev %x\n", soc_str, soc_pass); 108 periph_rev = 1; 109 pass_str = "Unknown Revision"; 110 break; 111 } 112 return ret; 113 } 114 115 void bcm1480_setup(void) 116 { 117 uint64_t sys_rev; 118 int plldiv; 119 120 sb1_pass = read_c0_prid() & 0xff; 121 sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION)); 122 soc_type = SYS_SOC_TYPE(sys_rev); 123 part_type = G_SYS_PART(sys_rev); 124 soc_pass = G_SYS_REVISION(sys_rev); 125 126 if (sys_rev_decode()) { 127 printk("Restart after failure to identify SiByte chip\n"); 128 machine_restart(NULL); 129 } 130 131 plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG))); 132 zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25); 133 134 printk("Broadcom SiByte %s %s @ %d MHz (SB-1A rev %d)\n", 135 soc_str, pass_str, zbbus_mhz * 2, sb1_pass); 136 printk("Board type: %s\n", get_system_type()); 137 } 138