arch/mips/bcm63xx/cpu.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
   7  * Copyright (C) 2009 Florian Fainelli <florian@openwrt.org>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/cpu.h>
  13 #include <asm/cpu.h>
  14 #include <asm/cpu-info.h>
  15 #include <asm/mipsregs.h>
  16 #include <bcm63xx_cpu.h>
  17 #include <bcm63xx_regs.h>
  18 #include <bcm63xx_io.h>
  19 #include <bcm63xx_irq.h>
  20
  21 const unsigned long *bcm63xx_regs_base;
  22 EXPORT_SYMBOL(bcm63xx_regs_base);
  23
  24 const int *bcm63xx_irqs;
  25 EXPORT_SYMBOL(bcm63xx_irqs);
  26
  27 static u16 bcm63xx_cpu_id;
  28 static u8 bcm63xx_cpu_rev;
  29 static unsigned int bcm63xx_cpu_freq;
  30 static unsigned int bcm63xx_memory_size;
  31
  32 static const unsigned long bcm6328_regs_base[] = {
  33         __GEN_CPU_REGS_TABLE(6328)
  34 };
  35
  36 static const int bcm6328_irqs[] = {
  37         __GEN_CPU_IRQ_TABLE(6328)
  38 };
  39
  40 static const unsigned long bcm6338_regs_base[] = {
  41         __GEN_CPU_REGS_TABLE(6338)
  42 };
  43
  44 static const int bcm6338_irqs[] = {
  45         __GEN_CPU_IRQ_TABLE(6338)
  46 };
  47
  48 static const unsigned long bcm6345_regs_base[] = {
  49         __GEN_CPU_REGS_TABLE(6345)
  50 };
  51
  52 static const int bcm6345_irqs[] = {
  53         __GEN_CPU_IRQ_TABLE(6345)
  54 };
  55
  56 static const unsigned long bcm6348_regs_base[] = {
  57         __GEN_CPU_REGS_TABLE(6348)
  58 };
  59
  60 static const int bcm6348_irqs[] = {
  61         __GEN_CPU_IRQ_TABLE(6348)
  62
  63 };
  64
  65 static const unsigned long bcm6358_regs_base[] = {
  66         __GEN_CPU_REGS_TABLE(6358)
  67 };
  68
  69 static const int bcm6358_irqs[] = {
  70         __GEN_CPU_IRQ_TABLE(6358)
  71
  72 };
  73
  74 static const unsigned long bcm6362_regs_base[] = {
  75         __GEN_CPU_REGS_TABLE(6362)
  76 };
  77
  78 static const int bcm6362_irqs[] = {
  79         __GEN_CPU_IRQ_TABLE(6362)
  80
  81 };
  82
  83 static const unsigned long bcm6368_regs_base[] = {
  84         __GEN_CPU_REGS_TABLE(6368)
  85 };
  86
  87 static const int bcm6368_irqs[] = {
  88         __GEN_CPU_IRQ_TABLE(6368)
  89
  90 };
  91
  92 u16 __bcm63xx_get_cpu_id(void)
  93 {
  94         return bcm63xx_cpu_id;
  95 }
  96
  97 EXPORT_SYMBOL(__bcm63xx_get_cpu_id);
  98
  99 u8 bcm63xx_get_cpu_rev(void)
 100 {
 101         return bcm63xx_cpu_rev;
 102 }
 103
 104 EXPORT_SYMBOL(bcm63xx_get_cpu_rev);
 105
 106 unsigned int bcm63xx_get_cpu_freq(void)
 107 {
 108         return bcm63xx_cpu_freq;
 109 }
 110
 111 unsigned int bcm63xx_get_memory_size(void)
 112 {
 113         return bcm63xx_memory_size;
 114 }
 115
 116 static unsigned int detect_cpu_clock(void)
 117 {
 118         switch (bcm63xx_get_cpu_id()) {
 119         case BCM6328_CPU_ID:
 120         {
 121                 unsigned int tmp, mips_pll_fcvo;
 122
 123                 tmp = bcm_misc_readl(MISC_STRAPBUS_6328_REG);
 124                 mips_pll_fcvo = (tmp & STRAPBUS_6328_FCVO_MASK)
 125                                 >> STRAPBUS_6328_FCVO_SHIFT;
 126
 127                 switch (mips_pll_fcvo) {
 128                 case 0x12:
 129                 case 0x14:
 130                 case 0x19:
 131                         return 160000000;
 132                 case 0x1c:
 133                         return 192000000;
 134                 case 0x13:
 135                 case 0x15:
 136                         return 200000000;
 137                 case 0x1a:
 138                         return 384000000;
 139                 case 0x16:
 140                         return 400000000;
 141                 default:
 142                         return 320000000;
 143                 }
 144
 145         }
 146         case BCM6338_CPU_ID:
 147                 /* BCM6338 has a fixed 240 Mhz frequency */
 148                 return 240000000;
 149
 150         case BCM6345_CPU_ID:
 151                 /* BCM6345 has a fixed 140Mhz frequency */
 152                 return 140000000;
 153
 154         case BCM6348_CPU_ID:
 155         {
 156                 unsigned int tmp, n1, n2, m1;
 157
 158                 /* 16MHz * (N1 + 1) * (N2 + 2) / (M1_CPU + 1) */
 159                 tmp = bcm_perf_readl(PERF_MIPSPLLCTL_REG);
 160                 n1 = (tmp & MIPSPLLCTL_N1_MASK) >> MIPSPLLCTL_N1_SHIFT;
 161                 n2 = (tmp & MIPSPLLCTL_N2_MASK) >> MIPSPLLCTL_N2_SHIFT;
 162                 m1 = (tmp & MIPSPLLCTL_M1CPU_MASK) >> MIPSPLLCTL_M1CPU_SHIFT;
 163                 n1 += 1;
 164                 n2 += 2;
 165                 m1 += 1;
 166                 return (16 * 1000000 * n1 * n2) / m1;
 167         }
 168
 169         case BCM6358_CPU_ID:
 170         {
 171                 unsigned int tmp, n1, n2, m1;
 172
 173                 /* 16MHz * N1 * N2 / M1_CPU */
 174                 tmp = bcm_ddr_readl(DDR_DMIPSPLLCFG_REG);
 175                 n1 = (tmp & DMIPSPLLCFG_N1_MASK) >> DMIPSPLLCFG_N1_SHIFT;
 176                 n2 = (tmp & DMIPSPLLCFG_N2_MASK) >> DMIPSPLLCFG_N2_SHIFT;
 177                 m1 = (tmp & DMIPSPLLCFG_M1_MASK) >> DMIPSPLLCFG_M1_SHIFT;
 178                 return (16 * 1000000 * n1 * n2) / m1;
 179         }
 180
 181         case BCM6362_CPU_ID:
 182         {
 183                 unsigned int tmp, mips_pll_fcvo;
 184
 185                 tmp = bcm_misc_readl(MISC_STRAPBUS_6362_REG);
 186                 mips_pll_fcvo = (tmp & STRAPBUS_6362_FCVO_MASK)
 187                                 >> STRAPBUS_6362_FCVO_SHIFT;
 188                 switch (mips_pll_fcvo) {
 189                 case 0x03:
 190                 case 0x0b:
 191                 case 0x13:
 192                 case 0x1b:
 193                         return 240000000;
 194                 case 0x04:
 195                 case 0x0c:
 196                 case 0x14:
 197                 case 0x1c:
 198                         return 160000000;
 199                 case 0x05:
 200                 case 0x0e:
 201                 case 0x16:
 202                 case 0x1e:
 203                 case 0x1f:
 204                         return 400000000;
 205                 case 0x06:
 206                         return 440000000;
 207                 case 0x07:
 208                 case 0x17:
 209                         return 384000000;
 210                 case 0x15:
 211                 case 0x1d:
 212                         return 200000000;
 213                 default:
 214                         return 320000000;
 215                 }
 216         }
 217         case BCM6368_CPU_ID:
 218         {
 219                 unsigned int tmp, p1, p2, ndiv, m1;
 220
 221                 /* (64MHz / P1) * P2 * NDIV / M1_CPU */
 222                 tmp = bcm_ddr_readl(DDR_DMIPSPLLCFG_6368_REG);
 223
 224                 p1 = (tmp & DMIPSPLLCFG_6368_P1_MASK) >>
 225                         DMIPSPLLCFG_6368_P1_SHIFT;
 226
 227                 p2 = (tmp & DMIPSPLLCFG_6368_P2_MASK) >>
 228                         DMIPSPLLCFG_6368_P2_SHIFT;
 229
 230                 ndiv = (tmp & DMIPSPLLCFG_6368_NDIV_MASK) >>
 231                         DMIPSPLLCFG_6368_NDIV_SHIFT;
 232
 233                 tmp = bcm_ddr_readl(DDR_DMIPSPLLDIV_6368_REG);
 234                 m1 = (tmp & DMIPSPLLDIV_6368_MDIV_MASK) >>
 235                         DMIPSPLLDIV_6368_MDIV_SHIFT;
 236
 237                 return (((64 * 1000000) / p1) * p2 * ndiv) / m1;
 238         }
 239
 240         default:
 241                 BUG();
 242         }
 243 }
 244
 245 /*
 246  * attempt to detect the amount of memory installed
 247  */
 248 static unsigned int detect_memory_size(void)
 249 {
 250         unsigned int cols = 0, rows = 0, is_32bits = 0, banks = 0;
 251         u32 val;
 252
 253         if (BCMCPU_IS_6328() || BCMCPU_IS_6362())
 254                 return bcm_ddr_readl(DDR_CSEND_REG) << 24;
 255
 256         if (BCMCPU_IS_6345()) {
 257                 val = bcm_sdram_readl(SDRAM_MBASE_REG);
 258                 return (val * 8 * 1024 * 1024);
 259         }
 260
 261         if (BCMCPU_IS_6338() || BCMCPU_IS_6348()) {
 262                 val = bcm_sdram_readl(SDRAM_CFG_REG);
 263                 rows = (val & SDRAM_CFG_ROW_MASK) >> SDRAM_CFG_ROW_SHIFT;
 264                 cols = (val & SDRAM_CFG_COL_MASK) >> SDRAM_CFG_COL_SHIFT;
 265                 is_32bits = (val & SDRAM_CFG_32B_MASK) ? 1 : 0;
 266                 banks = (val & SDRAM_CFG_BANK_MASK) ? 2 : 1;
 267         }
 268
 269         if (BCMCPU_IS_6358() || BCMCPU_IS_6368()) {
 270                 val = bcm_memc_readl(MEMC_CFG_REG);
 271                 rows = (val & MEMC_CFG_ROW_MASK) >> MEMC_CFG_ROW_SHIFT;
 272                 cols = (val & MEMC_CFG_COL_MASK) >> MEMC_CFG_COL_SHIFT;
 273                 is_32bits = (val & MEMC_CFG_32B_MASK) ? 0 : 1;
 274                 banks = 2;
 275         }
 276
 277         /* 0 => 11 address bits ... 2 => 13 address bits */
 278         rows += 11;
 279
 280         /* 0 => 8 address bits ... 2 => 10 address bits */
 281         cols += 8;
 282
 283         return 1 << (cols + rows + (is_32bits + 1) + banks);
 284 }
 285
 286 void __init bcm63xx_cpu_init(void)
 287 {
 288         unsigned int tmp;
 289         struct cpuinfo_mips *c = &current_cpu_data;
 290         unsigned int cpu = smp_processor_id();
 291         u32 chipid_reg;
 292
 293         /* soc registers location depends on cpu type */
 294         chipid_reg = 0;
 295
 296         switch (c->cputype) {
 297         case CPU_BMIPS3300:
 298                 if ((read_c0_prid() & 0xff00) != PRID_IMP_BMIPS3300_ALT)
 299                         __cpu_name[cpu] = "Broadcom BCM6338";
 300                 /* fall-through */
 301         case CPU_BMIPS32:
 302                 chipid_reg = BCM_6345_PERF_BASE;
 303                 break;
 304         case CPU_BMIPS4350:
 305                 if ((read_c0_prid() & 0xf0) == 0x10)
 306                         chipid_reg = BCM_6345_PERF_BASE;
 307                 else
 308                         chipid_reg = BCM_6368_PERF_BASE;
 309                 break;
 310         }
 311
 312         /*
 313          * really early to panic, but delaying panic would not help since we
 314          * will never get any working console
 315          */
 316         if (!chipid_reg)
 317                 panic("unsupported Broadcom CPU");
 318
 319         /* read out CPU type */
 320         tmp = bcm_readl(chipid_reg);
 321         bcm63xx_cpu_id = (tmp & REV_CHIPID_MASK) >> REV_CHIPID_SHIFT;
 322         bcm63xx_cpu_rev = (tmp & REV_REVID_MASK) >> REV_REVID_SHIFT;
 323
 324         switch (bcm63xx_cpu_id) {
 325         case BCM6328_CPU_ID:
 326                 bcm63xx_regs_base = bcm6328_regs_base;
 327                 bcm63xx_irqs = bcm6328_irqs;
 328                 break;
 329         case BCM6338_CPU_ID:
 330                 bcm63xx_regs_base = bcm6338_regs_base;
 331                 bcm63xx_irqs = bcm6338_irqs;
 332                 break;
 333         case BCM6345_CPU_ID:
 334                 bcm63xx_regs_base = bcm6345_regs_base;
 335                 bcm63xx_irqs = bcm6345_irqs;
 336                 break;
 337         case BCM6348_CPU_ID:
 338                 bcm63xx_regs_base = bcm6348_regs_base;
 339                 bcm63xx_irqs = bcm6348_irqs;
 340                 break;
 341         case BCM6358_CPU_ID:
 342                 bcm63xx_regs_base = bcm6358_regs_base;
 343                 bcm63xx_irqs = bcm6358_irqs;
 344                 break;
 345         case BCM6362_CPU_ID:
 346                 bcm63xx_regs_base = bcm6362_regs_base;
 347                 bcm63xx_irqs = bcm6362_irqs;
 348                 break;
 349         case BCM6368_CPU_ID:
 350                 bcm63xx_regs_base = bcm6368_regs_base;
 351                 bcm63xx_irqs = bcm6368_irqs;
 352                 break;
 353         default:
 354                 panic("unsupported broadcom CPU %x", bcm63xx_cpu_id);
 355                 break;
 356         }
 357
 358         bcm63xx_cpu_freq = detect_cpu_clock();
 359         bcm63xx_memory_size = detect_memory_size();
 360
 361         printk(KERN_INFO "Detected Broadcom 0x%04x CPU revision %02x\n",
 362                bcm63xx_cpu_id, bcm63xx_cpu_rev);
 363         printk(KERN_INFO "CPU frequency is %u MHz\n",
 364                bcm63xx_cpu_freq / 1000000);
 365         printk(KERN_INFO "%uMB of RAM installed\n",
 366                bcm63xx_memory_size >> 20);
 367 }