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