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/export.h> 19 #include <linux/init.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 EXPORT_SYMBOL_GPL(periph_rev); 38 unsigned int zbbus_mhz; 39 EXPORT_SYMBOL(zbbus_mhz); 40 41 static char *soc_str; 42 static char *pass_str; 43 static unsigned int war_pass; /* XXXKW don't overload PASS defines? */ 44 45 static int __init setup_bcm1250(void) 46 { 47 int ret = 0; 48 49 switch (soc_pass) { 50 case K_SYS_REVISION_BCM1250_PASS1: 51 periph_rev = 1; 52 pass_str = "Pass 1"; 53 break; 54 case K_SYS_REVISION_BCM1250_A10: 55 periph_rev = 2; 56 pass_str = "A8/A10"; 57 /* XXXKW different war_pass? */ 58 war_pass = K_SYS_REVISION_BCM1250_PASS2; 59 break; 60 case K_SYS_REVISION_BCM1250_PASS2_2: 61 periph_rev = 2; 62 pass_str = "B1"; 63 break; 64 case K_SYS_REVISION_BCM1250_B2: 65 periph_rev = 2; 66 pass_str = "B2"; 67 war_pass = K_SYS_REVISION_BCM1250_PASS2_2; 68 break; 69 case K_SYS_REVISION_BCM1250_PASS3: 70 periph_rev = 3; 71 pass_str = "C0"; 72 break; 73 case K_SYS_REVISION_BCM1250_C1: 74 periph_rev = 3; 75 pass_str = "C1"; 76 break; 77 default: 78 if (soc_pass < K_SYS_REVISION_BCM1250_PASS2_2) { 79 periph_rev = 2; 80 pass_str = "A0-A6"; 81 war_pass = K_SYS_REVISION_BCM1250_PASS2; 82 } else { 83 printk("Unknown BCM1250 rev %x\n", soc_pass); 84 ret = 1; 85 } 86 break; 87 } 88 89 return ret; 90 } 91 92 int sb1250_m3_workaround_needed(void) 93 { 94 switch (soc_type) { 95 case K_SYS_SOC_TYPE_BCM1250: 96 case K_SYS_SOC_TYPE_BCM1250_ALT: 97 case K_SYS_SOC_TYPE_BCM1250_ALT2: 98 case K_SYS_SOC_TYPE_BCM1125: 99 case K_SYS_SOC_TYPE_BCM1125H: 100 return soc_pass < K_SYS_REVISION_BCM1250_C0; 101 102 default: 103 return 0; 104 } 105 } 106 107 static int __init setup_bcm112x(void) 108 { 109 int ret = 0; 110 111 switch (soc_pass) { 112 case 0: 113 /* Early build didn't have revid set */ 114 periph_rev = 3; 115 pass_str = "A1"; 116 war_pass = K_SYS_REVISION_BCM112x_A1; 117 break; 118 case K_SYS_REVISION_BCM112x_A1: 119 periph_rev = 3; 120 pass_str = "A1"; 121 break; 122 case K_SYS_REVISION_BCM112x_A2: 123 periph_rev = 3; 124 pass_str = "A2"; 125 break; 126 case K_SYS_REVISION_BCM112x_A3: 127 periph_rev = 3; 128 pass_str = "A3"; 129 break; 130 case K_SYS_REVISION_BCM112x_A4: 131 periph_rev = 3; 132 pass_str = "A4"; 133 break; 134 case K_SYS_REVISION_BCM112x_B0: 135 periph_rev = 3; 136 pass_str = "B0"; 137 break; 138 default: 139 printk("Unknown %s rev %x\n", soc_str, soc_pass); 140 ret = 1; 141 } 142 143 return ret; 144 } 145 146 /* Setup code likely to be common to all SiByte platforms */ 147 148 static int __init sys_rev_decode(void) 149 { 150 int ret = 0; 151 152 war_pass = soc_pass; 153 switch (soc_type) { 154 case K_SYS_SOC_TYPE_BCM1250: 155 case K_SYS_SOC_TYPE_BCM1250_ALT: 156 case K_SYS_SOC_TYPE_BCM1250_ALT2: 157 soc_str = "BCM1250"; 158 ret = setup_bcm1250(); 159 break; 160 case K_SYS_SOC_TYPE_BCM1120: 161 soc_str = "BCM1120"; 162 ret = setup_bcm112x(); 163 break; 164 case K_SYS_SOC_TYPE_BCM1125: 165 soc_str = "BCM1125"; 166 ret = setup_bcm112x(); 167 break; 168 case K_SYS_SOC_TYPE_BCM1125H: 169 soc_str = "BCM1125H"; 170 ret = setup_bcm112x(); 171 break; 172 default: 173 printk("Unknown SOC type %x\n", soc_type); 174 ret = 1; 175 break; 176 } 177 178 return ret; 179 } 180 181 void __init sb1250_setup(void) 182 { 183 uint64_t sys_rev; 184 int plldiv; 185 int bad_config = 0; 186 187 sb1_pass = read_c0_prid() & PRID_REV_MASK; 188 sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION)); 189 soc_type = SYS_SOC_TYPE(sys_rev); 190 soc_pass = G_SYS_REVISION(sys_rev); 191 192 if (sys_rev_decode()) { 193 printk("Restart after failure to identify SiByte chip\n"); 194 machine_restart(NULL); 195 } 196 197 plldiv = G_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG))); 198 zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25); 199 200 printk("Broadcom SiByte %s %s @ %d MHz (SB1 rev %d)\n", 201 soc_str, pass_str, zbbus_mhz * 2, sb1_pass); 202 printk("Board type: %s\n", get_system_type()); 203 204 switch (war_pass) { 205 case K_SYS_REVISION_BCM1250_PASS1: 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 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