1 /* 2 * Copyright (C) 2000, 2001, 2002, 2003 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/module.h> 20 #include <linux/kernel.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 #include <asm/sibyte/sb1250_regs.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 EXPORT_SYMBOL(zbbus_mhz); 39 40 static char *soc_str; 41 static char *pass_str; 42 static unsigned int war_pass; /* XXXKW don't overload PASS defines? */ 43 44 static int __init setup_bcm1250(void) 45 { 46 int ret = 0; 47 48 switch (soc_pass) { 49 case K_SYS_REVISION_BCM1250_PASS1: 50 periph_rev = 1; 51 pass_str = "Pass 1"; 52 break; 53 case K_SYS_REVISION_BCM1250_A10: 54 periph_rev = 2; 55 pass_str = "A8/A10"; 56 /* XXXKW different war_pass? */ 57 war_pass = K_SYS_REVISION_BCM1250_PASS2; 58 break; 59 case K_SYS_REVISION_BCM1250_PASS2_2: 60 periph_rev = 2; 61 pass_str = "B1"; 62 break; 63 case K_SYS_REVISION_BCM1250_B2: 64 periph_rev = 2; 65 pass_str = "B2"; 66 war_pass = K_SYS_REVISION_BCM1250_PASS2_2; 67 break; 68 case K_SYS_REVISION_BCM1250_PASS3: 69 periph_rev = 3; 70 pass_str = "C0"; 71 break; 72 case K_SYS_REVISION_BCM1250_C1: 73 periph_rev = 3; 74 pass_str = "C1"; 75 break; 76 default: 77 if (soc_pass < K_SYS_REVISION_BCM1250_PASS2_2) { 78 periph_rev = 2; 79 pass_str = "A0-A6"; 80 war_pass = K_SYS_REVISION_BCM1250_PASS2; 81 } else { 82 printk("Unknown BCM1250 rev %x\n", soc_pass); 83 ret = 1; 84 } 85 break; 86 } 87 88 return ret; 89 } 90 91 int sb1250_m3_workaround_needed(void) 92 { 93 switch (soc_type) { 94 case K_SYS_SOC_TYPE_BCM1250: 95 case K_SYS_SOC_TYPE_BCM1250_ALT: 96 case K_SYS_SOC_TYPE_BCM1250_ALT2: 97 case K_SYS_SOC_TYPE_BCM1125: 98 case K_SYS_SOC_TYPE_BCM1125H: 99 return soc_pass < K_SYS_REVISION_BCM1250_C0; 100 101 default: 102 return 0; 103 } 104 } 105 106 static int __init setup_bcm112x(void) 107 { 108 int ret = 0; 109 110 switch (soc_pass) { 111 case 0: 112 /* Early build didn't have revid set */ 113 periph_rev = 3; 114 pass_str = "A1"; 115 war_pass = K_SYS_REVISION_BCM112x_A1; 116 break; 117 case K_SYS_REVISION_BCM112x_A1: 118 periph_rev = 3; 119 pass_str = "A1"; 120 break; 121 case K_SYS_REVISION_BCM112x_A2: 122 periph_rev = 3; 123 pass_str = "A2"; 124 break; 125 case K_SYS_REVISION_BCM112x_A3: 126 periph_rev = 3; 127 pass_str = "A3"; 128 break; 129 case K_SYS_REVISION_BCM112x_A4: 130 periph_rev = 3; 131 pass_str = "A4"; 132 break; 133 case K_SYS_REVISION_BCM112x_B0: 134 periph_rev = 3; 135 pass_str = "B0"; 136 break; 137 default: 138 printk("Unknown %s rev %x\n", soc_str, soc_pass); 139 ret = 1; 140 } 141 142 return ret; 143 } 144 145 /* Setup code likely to be common to all SiByte platforms */ 146 147 static int __init sys_rev_decode(void) 148 { 149 int ret = 0; 150 151 war_pass = soc_pass; 152 switch (soc_type) { 153 case K_SYS_SOC_TYPE_BCM1250: 154 case K_SYS_SOC_TYPE_BCM1250_ALT: 155 case K_SYS_SOC_TYPE_BCM1250_ALT2: 156 soc_str = "BCM1250"; 157 ret = setup_bcm1250(); 158 break; 159 case K_SYS_SOC_TYPE_BCM1120: 160 soc_str = "BCM1120"; 161 ret = setup_bcm112x(); 162 break; 163 case K_SYS_SOC_TYPE_BCM1125: 164 soc_str = "BCM1125"; 165 ret = setup_bcm112x(); 166 break; 167 case K_SYS_SOC_TYPE_BCM1125H: 168 soc_str = "BCM1125H"; 169 ret = setup_bcm112x(); 170 break; 171 default: 172 printk("Unknown SOC type %x\n", soc_type); 173 ret = 1; 174 break; 175 } 176 177 return ret; 178 } 179 180 void __init sb1250_setup(void) 181 { 182 uint64_t sys_rev; 183 int plldiv; 184 int bad_config = 0; 185 186 sb1_pass = read_c0_prid() & PRID_REV_MASK; 187 sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION)); 188 soc_type = SYS_SOC_TYPE(sys_rev); 189 soc_pass = G_SYS_REVISION(sys_rev); 190 191 if (sys_rev_decode()) { 192 printk("Restart after failure to identify SiByte chip\n"); 193 machine_restart(NULL); 194 } 195 196 plldiv = G_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG))); 197 zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25); 198 199 printk("Broadcom SiByte %s %s @ %d MHz (SB1 rev %d)\n", 200 soc_str, pass_str, zbbus_mhz * 2, sb1_pass); 201 printk("Board type: %s\n", get_system_type()); 202 203 switch (war_pass) { 204 case K_SYS_REVISION_BCM1250_PASS1: 205 #ifndef CONFIG_SB1_PASS_1_WORKAROUNDS 206 printk("@@@@ This is a BCM1250 A0-A2 (Pass 1) board, " 207 "and the kernel doesn't have the proper " 208 "workarounds compiled in. @@@@\n"); 209 bad_config = 1; 210 #endif 211 break; 212 case K_SYS_REVISION_BCM1250_PASS2: 213 /* Pass 2 - easiest as default for now - so many numbers */ 214 #if !defined(CONFIG_SB1_PASS_2_WORKAROUNDS) || \ 215 !defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS) 216 printk("@@@@ This is a BCM1250 A3-A10 board, and the " 217 "kernel doesn't have the proper workarounds " 218 "compiled in. @@@@\n"); 219 bad_config = 1; 220 #endif 221 #ifdef CONFIG_CPU_HAS_PREFETCH 222 printk("@@@@ Prefetches may be enabled in this kernel, " 223 "but are buggy on this board. @@@@\n"); 224 bad_config = 1; 225 #endif 226 break; 227 case K_SYS_REVISION_BCM1250_PASS2_2: 228 #ifndef CONFIG_SB1_PASS_2_WORKAROUNDS 229 printk("@@@@ This is a BCM1250 B1/B2. board, and the " 230 "kernel doesn't have the proper workarounds " 231 "compiled in. @@@@\n"); 232 bad_config = 1; 233 #endif 234 #if defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS) || \ 235 !defined(CONFIG_CPU_HAS_PREFETCH) 236 printk("@@@@ This is a BCM1250 B1/B2, but the kernel is " 237 "conservatively configured for an 'A' stepping. " 238 "@@@@\n"); 239 #endif 240 break; 241 default: 242 break; 243 } 244 if (bad_config) { 245 printk("Invalid configuration for this chip.\n"); 246 machine_restart(NULL); 247 } 248 } 249