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/mipsregs.h> 26 #include <asm/io.h> 27 #include <asm/sibyte/sb1250.h> 28 #include <asm/sibyte/sb1250_regs.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 EXPORT_SYMBOL(soc_type); 35 unsigned int periph_rev; 36 unsigned int zbbus_mhz; 37 EXPORT_SYMBOL(zbbus_mhz); 38 39 static char *soc_str; 40 static char *pass_str; 41 static unsigned int war_pass; /* XXXKW don't overload PASS defines? */ 42 43 static int __init setup_bcm1250(void) 44 { 45 int ret = 0; 46 47 switch (soc_pass) { 48 case K_SYS_REVISION_BCM1250_PASS1: 49 periph_rev = 1; 50 pass_str = "Pass 1"; 51 break; 52 case K_SYS_REVISION_BCM1250_A10: 53 periph_rev = 2; 54 pass_str = "A8/A10"; 55 /* XXXKW different war_pass? */ 56 war_pass = K_SYS_REVISION_BCM1250_PASS2; 57 break; 58 case K_SYS_REVISION_BCM1250_PASS2_2: 59 periph_rev = 2; 60 pass_str = "B1"; 61 break; 62 case K_SYS_REVISION_BCM1250_B2: 63 periph_rev = 2; 64 pass_str = "B2"; 65 war_pass = K_SYS_REVISION_BCM1250_PASS2_2; 66 break; 67 case K_SYS_REVISION_BCM1250_PASS3: 68 periph_rev = 3; 69 pass_str = "C0"; 70 break; 71 case K_SYS_REVISION_BCM1250_C1: 72 periph_rev = 3; 73 pass_str = "C1"; 74 break; 75 default: 76 if (soc_pass < K_SYS_REVISION_BCM1250_PASS2_2) { 77 periph_rev = 2; 78 pass_str = "A0-A6"; 79 war_pass = K_SYS_REVISION_BCM1250_PASS2; 80 } else { 81 printk("Unknown BCM1250 rev %x\n", soc_pass); 82 ret = 1; 83 } 84 break; 85 } 86 87 return ret; 88 } 89 90 int sb1250_m3_workaround_needed(void) 91 { 92 switch (soc_type) { 93 case K_SYS_SOC_TYPE_BCM1250: 94 case K_SYS_SOC_TYPE_BCM1250_ALT: 95 case K_SYS_SOC_TYPE_BCM1250_ALT2: 96 case K_SYS_SOC_TYPE_BCM1125: 97 case K_SYS_SOC_TYPE_BCM1125H: 98 return soc_pass < K_SYS_REVISION_BCM1250_C0; 99 100 default: 101 return 0; 102 } 103 } 104 105 static int __init setup_bcm112x(void) 106 { 107 int ret = 0; 108 109 switch (soc_pass) { 110 case 0: 111 /* Early build didn't have revid set */ 112 periph_rev = 3; 113 pass_str = "A1"; 114 war_pass = K_SYS_REVISION_BCM112x_A1; 115 break; 116 case K_SYS_REVISION_BCM112x_A1: 117 periph_rev = 3; 118 pass_str = "A1"; 119 break; 120 case K_SYS_REVISION_BCM112x_A2: 121 periph_rev = 3; 122 pass_str = "A2"; 123 break; 124 case K_SYS_REVISION_BCM112x_A3: 125 periph_rev = 3; 126 pass_str = "A3"; 127 break; 128 case K_SYS_REVISION_BCM112x_A4: 129 periph_rev = 3; 130 pass_str = "A4"; 131 break; 132 case K_SYS_REVISION_BCM112x_B0: 133 periph_rev = 3; 134 pass_str = "B0"; 135 break; 136 default: 137 printk("Unknown %s rev %x\n", soc_str, soc_pass); 138 ret = 1; 139 } 140 141 return ret; 142 } 143 144 /* Setup code likely to be common to all SiByte platforms */ 145 146 static int __init sys_rev_decode(void) 147 { 148 int ret = 0; 149 150 war_pass = soc_pass; 151 switch (soc_type) { 152 case K_SYS_SOC_TYPE_BCM1250: 153 case K_SYS_SOC_TYPE_BCM1250_ALT: 154 case K_SYS_SOC_TYPE_BCM1250_ALT2: 155 soc_str = "BCM1250"; 156 ret = setup_bcm1250(); 157 break; 158 case K_SYS_SOC_TYPE_BCM1120: 159 soc_str = "BCM1120"; 160 ret = setup_bcm112x(); 161 break; 162 case K_SYS_SOC_TYPE_BCM1125: 163 soc_str = "BCM1125"; 164 ret = setup_bcm112x(); 165 break; 166 case K_SYS_SOC_TYPE_BCM1125H: 167 soc_str = "BCM1125H"; 168 ret = setup_bcm112x(); 169 break; 170 default: 171 printk("Unknown SOC type %x\n", soc_type); 172 ret = 1; 173 break; 174 } 175 176 return ret; 177 } 178 179 void __init sb1250_setup(void) 180 { 181 uint64_t sys_rev; 182 int plldiv; 183 int bad_config = 0; 184 185 sb1_pass = read_c0_prid() & 0xff; 186 sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION)); 187 soc_type = SYS_SOC_TYPE(sys_rev); 188 soc_pass = G_SYS_REVISION(sys_rev); 189 190 if (sys_rev_decode()) { 191 printk("Restart after failure to identify SiByte chip\n"); 192 machine_restart(NULL); 193 } 194 195 plldiv = G_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG))); 196 zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25); 197 198 printk("Broadcom SiByte %s %s @ %d MHz (SB1 rev %d)\n", 199 soc_str, pass_str, zbbus_mhz * 2, sb1_pass); 200 printk("Board type: %s\n", get_system_type()); 201 202 switch (war_pass) { 203 case K_SYS_REVISION_BCM1250_PASS1: 204 #ifndef CONFIG_SB1_PASS_1_WORKAROUNDS 205 printk("@@@@ This is a BCM1250 A0-A2 (Pass 1) board, " 206 "and the kernel doesn't have the proper " 207 "workarounds compiled in. @@@@\n"); 208 bad_config = 1; 209 #endif 210 break; 211 case K_SYS_REVISION_BCM1250_PASS2: 212 /* Pass 2 - easiest as default for now - so many numbers */ 213 #if !defined(CONFIG_SB1_PASS_2_WORKAROUNDS) || \ 214 !defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS) 215 printk("@@@@ This is a BCM1250 A3-A10 board, and the " 216 "kernel doesn't have the proper workarounds " 217 "compiled in. @@@@\n"); 218 bad_config = 1; 219 #endif 220 #ifdef CONFIG_CPU_HAS_PREFETCH 221 printk("@@@@ Prefetches may be enabled in this kernel, " 222 "but are buggy on this board. @@@@\n"); 223 bad_config = 1; 224 #endif 225 break; 226 case K_SYS_REVISION_BCM1250_PASS2_2: 227 #ifndef CONFIG_SB1_PASS_2_WORKAROUNDS 228 printk("@@@@ This is a BCM1250 B1/B2. board, and the " 229 "kernel doesn't have the proper workarounds " 230 "compiled in. @@@@\n"); 231 bad_config = 1; 232 #endif 233 #if defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS) || \ 234 !defined(CONFIG_CPU_HAS_PREFETCH) 235 printk("@@@@ This is a BCM1250 B1/B2, but the kernel is " 236 "conservatively configured for an 'A' stepping. " 237 "@@@@\n"); 238 #endif 239 break; 240 default: 241 break; 242 } 243 if (bad_config) { 244 printk("Invalid configuration for this chip.\n"); 245 machine_restart(NULL); 246 } 247 } 248