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