arch/powerpc/kernel/cpu_setup_6xx.S

   1 /*
   2  * This file contains low level CPU setup functions.
   3  *    Copyright (C) 2003 Benjamin Herrenschmidt (benh@kernel.crashing.org)
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version
   8  * 2 of the License, or (at your option) any later version.
   9  *
  10  */
  11
  12 #include <asm/processor.h>
  13 #include <asm/page.h>
  14 #include <asm/cputable.h>
  15 #include <asm/ppc_asm.h>
  16 #include <asm/asm-offsets.h>
  17 #include <asm/cache.h>
  18 #include <asm/mmu.h>
  19
  20 _GLOBAL(__setup_cpu_603)
  21         mflr    r5
  22 BEGIN_MMU_FTR_SECTION
  23         li      r10,0
  24         mtspr   SPRN_SPRG_603_LRU,r10           /* init SW LRU tracking */
  25 END_MMU_FTR_SECTION_IFSET(MMU_FTR_NEED_DTLB_SW_LRU)
  26 BEGIN_FTR_SECTION
  27         bl      __init_fpu_registers
  28 END_FTR_SECTION_IFCLR(CPU_FTR_FPU_UNAVAILABLE)
  29         bl      setup_common_caches
  30         mtlr    r5
  31         blr
  32 _GLOBAL(__setup_cpu_604)
  33         mflr    r5
  34         bl      setup_common_caches
  35         bl      setup_604_hid0
  36         mtlr    r5
  37         blr
  38 _GLOBAL(__setup_cpu_750)
  39         mflr    r5
  40         bl      __init_fpu_registers
  41         bl      setup_common_caches
  42         bl      setup_750_7400_hid0
  43         mtlr    r5
  44         blr
  45 _GLOBAL(__setup_cpu_750cx)
  46         mflr    r5
  47         bl      __init_fpu_registers
  48         bl      setup_common_caches
  49         bl      setup_750_7400_hid0
  50         bl      setup_750cx
  51         mtlr    r5
  52         blr
  53 _GLOBAL(__setup_cpu_750fx)
  54         mflr    r5
  55         bl      __init_fpu_registers
  56         bl      setup_common_caches
  57         bl      setup_750_7400_hid0
  58         bl      setup_750fx
  59         mtlr    r5
  60         blr
  61 _GLOBAL(__setup_cpu_7400)
  62         mflr    r5
  63         bl      __init_fpu_registers
  64         bl      setup_7400_workarounds
  65         bl      setup_common_caches
  66         bl      setup_750_7400_hid0
  67         mtlr    r5
  68         blr
  69 _GLOBAL(__setup_cpu_7410)
  70         mflr    r5
  71         bl      __init_fpu_registers
  72         bl      setup_7410_workarounds
  73         bl      setup_common_caches
  74         bl      setup_750_7400_hid0
  75         li      r3,0
  76         mtspr   SPRN_L2CR2,r3
  77         mtlr    r5
  78         blr
  79 _GLOBAL(__setup_cpu_745x)
  80         mflr    r5
  81         bl      setup_common_caches
  82         bl      setup_745x_specifics
  83         mtlr    r5
  84         blr
  85
  86 /* Enable caches for 603's, 604, 750 & 7400 */
  87 setup_common_caches:
  88         mfspr   r11,SPRN_HID0
  89         andi.   r0,r11,HID0_DCE
  90         ori     r11,r11,HID0_ICE|HID0_DCE
  91         ori     r8,r11,HID0_ICFI
  92         bne     1f                      /* don't invalidate the D-cache */
  93         ori     r8,r8,HID0_DCI          /* unless it wasn't enabled */
  94 1:      sync
  95         mtspr   SPRN_HID0,r8            /* enable and invalidate caches */
  96         sync
  97         mtspr   SPRN_HID0,r11           /* enable caches */
  98         sync
  99         isync
 100         blr
 101
 102 /* 604, 604e, 604ev, ...
 103  * Enable superscalar execution & branch history table
 104  */
 105 setup_604_hid0:
 106         mfspr   r11,SPRN_HID0
 107         ori     r11,r11,HID0_SIED|HID0_BHTE
 108         ori     r8,r11,HID0_BTCD
 109         sync
 110         mtspr   SPRN_HID0,r8    /* flush branch target address cache */
 111         sync                    /* on 604e/604r */
 112         mtspr   SPRN_HID0,r11
 113         sync
 114         isync
 115         blr
 116
 117 /* 7400 <= rev 2.7 and 7410 rev = 1.0 suffer from some
 118  * erratas we work around here.
 119  * Moto MPC710CE.pdf describes them, those are errata
 120  * #3, #4 and #5
 121  * Note that we assume the firmware didn't choose to
 122  * apply other workarounds (there are other ones documented
 123  * in the .pdf). It appear that Apple firmware only works
 124  * around #3 and with the same fix we use. We may want to
 125  * check if the CPU is using 60x bus mode in which case
 126  * the workaround for errata #4 is useless. Also, we may
 127  * want to explicitly clear HID0_NOPDST as this is not
 128  * needed once we have applied workaround #5 (though it's
 129  * not set by Apple's firmware at least).
 130  */
 131 setup_7400_workarounds:
 132         mfpvr   r3
 133         rlwinm  r3,r3,0,20,31
 134         cmpwi   0,r3,0x0207
 135         ble     1f
 136         blr
 137 setup_7410_workarounds:
 138         mfpvr   r3
 139         rlwinm  r3,r3,0,20,31
 140         cmpwi   0,r3,0x0100
 141         bnelr
 142 1:
 143         mfspr   r11,SPRN_MSSSR0
 144         /* Errata #3: Set L1OPQ_SIZE to 0x10 */
 145         rlwinm  r11,r11,0,9,6
 146         oris    r11,r11,0x0100
 147         /* Errata #4: Set L2MQ_SIZE to 1 (check for MPX mode first ?) */
 148         oris    r11,r11,0x0002
 149         /* Errata #5: Set DRLT_SIZE to 0x01 */
 150         rlwinm  r11,r11,0,5,2
 151         oris    r11,r11,0x0800
 152         sync
 153         mtspr   SPRN_MSSSR0,r11
 154         sync
 155         isync
 156         blr
 157
 158 /* 740/750/7400/7410
 159  * Enable Store Gathering (SGE), Address Brodcast (ABE),
 160  * Branch History Table (BHTE), Branch Target ICache (BTIC)
 161  * Dynamic Power Management (DPM), Speculative (SPD)
 162  * Clear Instruction cache throttling (ICTC)
 163  */
 164 setup_750_7400_hid0:
 165         mfspr   r11,SPRN_HID0
 166         ori     r11,r11,HID0_SGE | HID0_ABE | HID0_BHTE | HID0_BTIC
 167         oris    r11,r11,HID0_DPM@h
 168 BEGIN_FTR_SECTION
 169         xori    r11,r11,HID0_BTIC
 170 END_FTR_SECTION_IFSET(CPU_FTR_NO_BTIC)
 171 BEGIN_FTR_SECTION
 172         xoris   r11,r11,HID0_DPM@h      /* disable dynamic power mgmt */
 173 END_FTR_SECTION_IFSET(CPU_FTR_NO_DPM)
 174         li      r3,HID0_SPD
 175         andc    r11,r11,r3              /* clear SPD: enable speculative */
 176         li      r3,0
 177         mtspr   SPRN_ICTC,r3            /* Instruction Cache Throttling off */
 178         isync
 179         mtspr   SPRN_HID0,r11
 180         sync
 181         isync
 182         blr
 183
 184 /* 750cx specific
 185  * Looks like we have to disable NAP feature for some PLL settings...
 186  * (waiting for confirmation)
 187  */
 188 setup_750cx:
 189         mfspr   r10, SPRN_HID1
 190         rlwinm  r10,r10,4,28,31
 191         cmpwi   cr0,r10,7
 192         cmpwi   cr1,r10,9
 193         cmpwi   cr2,r10,11
 194         cror    4*cr0+eq,4*cr0+eq,4*cr1+eq
 195         cror    4*cr0+eq,4*cr0+eq,4*cr2+eq
 196         bnelr
 197         lwz     r6,CPU_SPEC_FEATURES(r4)
 198         li      r7,CPU_FTR_CAN_NAP
 199         andc    r6,r6,r7
 200         stw     r6,CPU_SPEC_FEATURES(r4)
 201         blr
 202
 203 /* 750fx specific
 204  */
 205 setup_750fx:
 206         blr
 207
 208 /* MPC 745x
 209  * Enable Store Gathering (SGE), Branch Folding (FOLD)
 210  * Branch History Table (BHTE), Branch Target ICache (BTIC)
 211  * Dynamic Power Management (DPM), Speculative (SPD)
 212  * Ensure our data cache instructions really operate.
 213  * Timebase has to be running or we wouldn't have made it here,
 214  * just ensure we don't disable it.
 215  * Clear Instruction cache throttling (ICTC)
 216  * Enable L2 HW prefetch
 217  */
 218 setup_745x_specifics:
 219         /* We check for the presence of an L3 cache setup by
 220          * the firmware. If any, we disable NAP capability as
 221          * it's known to be bogus on rev 2.1 and earlier
 222          */
 223 BEGIN_FTR_SECTION
 224         mfspr   r11,SPRN_L3CR
 225         andis.  r11,r11,L3CR_L3E@h
 226         beq     1f
 227 END_FTR_SECTION_IFSET(CPU_FTR_L3CR)
 228         lwz     r6,CPU_SPEC_FEATURES(r4)
 229         andi.   r0,r6,CPU_FTR_L3_DISABLE_NAP
 230         beq     1f
 231         li      r7,CPU_FTR_CAN_NAP
 232         andc    r6,r6,r7
 233         stw     r6,CPU_SPEC_FEATURES(r4)
 234 1:
 235         mfspr   r11,SPRN_HID0
 236
 237         /* All of the bits we have to set.....
 238          */
 239         ori     r11,r11,HID0_SGE | HID0_FOLD | HID0_BHTE
 240         ori     r11,r11,HID0_LRSTK | HID0_BTIC
 241         oris    r11,r11,HID0_DPM@h
 242 BEGIN_MMU_FTR_SECTION
 243         oris    r11,r11,HID0_HIGH_BAT@h
 244 END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)
 245 BEGIN_FTR_SECTION
 246         xori    r11,r11,HID0_BTIC
 247 END_FTR_SECTION_IFSET(CPU_FTR_NO_BTIC)
 248 BEGIN_FTR_SECTION
 249         xoris   r11,r11,HID0_DPM@h      /* disable dynamic power mgmt */
 250 END_FTR_SECTION_IFSET(CPU_FTR_NO_DPM)
 251
 252         /* All of the bits we have to clear....
 253          */
 254         li      r3,HID0_SPD | HID0_NOPDST | HID0_NOPTI
 255         andc    r11,r11,r3              /* clear SPD: enable speculative */
 256         li      r3,0
 257
 258         mtspr   SPRN_ICTC,r3            /* Instruction Cache Throttling off */
 259         isync
 260         mtspr   SPRN_HID0,r11
 261         sync
 262         isync
 263
 264         /* Enable L2 HW prefetch, if L2 is enabled
 265          */
 266         mfspr   r3,SPRN_L2CR
 267         andis.  r3,r3,L2CR_L2E@h
 268         beqlr
 269         mfspr   r3,SPRN_MSSCR0
 270         ori     r3,r3,3
 271         sync
 272         mtspr   SPRN_MSSCR0,r3
 273         sync
 274         isync
 275         blr
 276
 277 /*
 278  * Initialize the FPU registers. This is needed to work around an errata
 279  * in some 750 cpus where using a not yet initialized FPU register after
 280  * power on reset may hang the CPU
 281  */
 282 _GLOBAL(__init_fpu_registers)
 283         mfmsr   r10
 284         ori     r11,r10,MSR_FP
 285         mtmsr   r11
 286         isync
 287         addis   r9,r3,empty_zero_page@ha
 288         addi    r9,r9,empty_zero_page@l
 289         REST_32FPRS(0,r9)
 290         sync
 291         mtmsr   r10
 292         isync
 293         blr
 294
 295
 296 /* Definitions for the table use to save CPU states */
 297 #define CS_HID0         0
 298 #define CS_HID1         4
 299 #define CS_HID2         8
 300 #define CS_MSSCR0       12
 301 #define CS_MSSSR0       16
 302 #define CS_ICTRL        20
 303 #define CS_LDSTCR       24
 304 #define CS_LDSTDB       28
 305 #define CS_SIZE         32
 306
 307         .data
 308         .balign L1_CACHE_BYTES
 309 cpu_state_storage:
 310         .space  CS_SIZE
 311         .balign L1_CACHE_BYTES,0
 312         .text
 313
 314 /* Called in normal context to backup CPU 0 state. This
 315  * does not include cache settings. This function is also
 316  * called for machine sleep. This does not include the MMU
 317  * setup, BATs, etc... but rather the "special" registers
 318  * like HID0, HID1, MSSCR0, etc...
 319  */
 320 _GLOBAL(__save_cpu_setup)
 321         /* Some CR fields are volatile, we back it up all */
 322         mfcr    r7
 323
 324         /* Get storage ptr */
 325         lis     r5,cpu_state_storage@h
 326         ori     r5,r5,cpu_state_storage@l
 327
 328         /* Save HID0 (common to all CONFIG_6xx cpus) */
 329         mfspr   r3,SPRN_HID0
 330         stw     r3,CS_HID0(r5)
 331
 332         /* Now deal with CPU type dependent registers */
 333         mfspr   r3,SPRN_PVR
 334         srwi    r3,r3,16
 335         cmplwi  cr0,r3,0x8000   /* 7450 */
 336         cmplwi  cr1,r3,0x000c   /* 7400 */
 337         cmplwi  cr2,r3,0x800c   /* 7410 */
 338         cmplwi  cr3,r3,0x8001   /* 7455 */
 339         cmplwi  cr4,r3,0x8002   /* 7457 */
 340         cmplwi  cr5,r3,0x8003   /* 7447A */
 341         cmplwi  cr6,r3,0x7000   /* 750FX */
 342         cmplwi  cr7,r3,0x8004   /* 7448 */
 343         /* cr1 is 7400 || 7410 */
 344         cror    4*cr1+eq,4*cr1+eq,4*cr2+eq
 345         /* cr0 is 74xx */
 346         cror    4*cr0+eq,4*cr0+eq,4*cr3+eq
 347         cror    4*cr0+eq,4*cr0+eq,4*cr4+eq
 348         cror    4*cr0+eq,4*cr0+eq,4*cr1+eq
 349         cror    4*cr0+eq,4*cr0+eq,4*cr5+eq
 350         cror    4*cr0+eq,4*cr0+eq,4*cr7+eq
 351         bne     1f
 352         /* Backup 74xx specific regs */
 353         mfspr   r4,SPRN_MSSCR0
 354         stw     r4,CS_MSSCR0(r5)
 355         mfspr   r4,SPRN_MSSSR0
 356         stw     r4,CS_MSSSR0(r5)
 357         beq     cr1,1f
 358         /* Backup 745x specific registers */
 359         mfspr   r4,SPRN_HID1
 360         stw     r4,CS_HID1(r5)
 361         mfspr   r4,SPRN_ICTRL
 362         stw     r4,CS_ICTRL(r5)
 363         mfspr   r4,SPRN_LDSTCR
 364         stw     r4,CS_LDSTCR(r5)
 365         mfspr   r4,SPRN_LDSTDB
 366         stw     r4,CS_LDSTDB(r5)
 367 1:
 368         bne     cr6,1f
 369         /* Backup 750FX specific registers */
 370         mfspr   r4,SPRN_HID1
 371         stw     r4,CS_HID1(r5)
 372         /* If rev 2.x, backup HID2 */
 373         mfspr   r3,SPRN_PVR
 374         andi.   r3,r3,0xff00
 375         cmpwi   cr0,r3,0x0200
 376         bne     1f
 377         mfspr   r4,SPRN_HID2
 378         stw     r4,CS_HID2(r5)
 379 1:
 380         mtcr    r7
 381         blr
 382
 383 /* Called with no MMU context (typically MSR:IR/DR off) to
 384  * restore CPU state as backed up by the previous
 385  * function. This does not include cache setting
 386  */
 387 _GLOBAL(__restore_cpu_setup)
 388         /* Some CR fields are volatile, we back it up all */
 389         mfcr    r7
 390
 391         /* Get storage ptr */
 392         lis     r5,(cpu_state_storage-KERNELBASE)@h
 393         ori     r5,r5,cpu_state_storage@l
 394
 395         /* Restore HID0 */
 396         lwz     r3,CS_HID0(r5)
 397         sync
 398         isync
 399         mtspr   SPRN_HID0,r3
 400         sync
 401         isync
 402
 403         /* Now deal with CPU type dependent registers */
 404         mfspr   r3,SPRN_PVR
 405         srwi    r3,r3,16
 406         cmplwi  cr0,r3,0x8000   /* 7450 */
 407         cmplwi  cr1,r3,0x000c   /* 7400 */
 408         cmplwi  cr2,r3,0x800c   /* 7410 */
 409         cmplwi  cr3,r3,0x8001   /* 7455 */
 410         cmplwi  cr4,r3,0x8002   /* 7457 */
 411         cmplwi  cr5,r3,0x8003   /* 7447A */
 412         cmplwi  cr6,r3,0x7000   /* 750FX */
 413         cmplwi  cr7,r3,0x8004   /* 7448 */
 414         /* cr1 is 7400 || 7410 */
 415         cror    4*cr1+eq,4*cr1+eq,4*cr2+eq
 416         /* cr0 is 74xx */
 417         cror    4*cr0+eq,4*cr0+eq,4*cr3+eq
 418         cror    4*cr0+eq,4*cr0+eq,4*cr4+eq
 419         cror    4*cr0+eq,4*cr0+eq,4*cr1+eq
 420         cror    4*cr0+eq,4*cr0+eq,4*cr5+eq
 421         cror    4*cr0+eq,4*cr0+eq,4*cr7+eq
 422         bne     2f
 423         /* Restore 74xx specific regs */
 424         lwz     r4,CS_MSSCR0(r5)
 425         sync
 426         mtspr   SPRN_MSSCR0,r4
 427         sync
 428         isync
 429         lwz     r4,CS_MSSSR0(r5)
 430         sync
 431         mtspr   SPRN_MSSSR0,r4
 432         sync
 433         isync
 434         bne     cr2,1f
 435         /* Clear 7410 L2CR2 */
 436         li      r4,0
 437         mtspr   SPRN_L2CR2,r4
 438 1:      beq     cr1,2f
 439         /* Restore 745x specific registers */
 440         lwz     r4,CS_HID1(r5)
 441         sync
 442         mtspr   SPRN_HID1,r4
 443         isync
 444         sync
 445         lwz     r4,CS_ICTRL(r5)
 446         sync
 447         mtspr   SPRN_ICTRL,r4
 448         isync
 449         sync
 450         lwz     r4,CS_LDSTCR(r5)
 451         sync
 452         mtspr   SPRN_LDSTCR,r4
 453         isync
 454         sync
 455         lwz     r4,CS_LDSTDB(r5)
 456         sync
 457         mtspr   SPRN_LDSTDB,r4
 458         isync
 459         sync
 460 2:      bne     cr6,1f
 461         /* Restore 750FX specific registers
 462          * that is restore HID2 on rev 2.x and PLL config & switch
 463          * to PLL 0 on all
 464          */
 465         /* If rev 2.x, restore HID2 with low voltage bit cleared */
 466         mfspr   r3,SPRN_PVR
 467         andi.   r3,r3,0xff00
 468         cmpwi   cr0,r3,0x0200
 469         bne     4f
 470         lwz     r4,CS_HID2(r5)
 471         rlwinm  r4,r4,0,19,17
 472         mtspr   SPRN_HID2,r4
 473         sync
 474 4:
 475         lwz     r4,CS_HID1(r5)
 476         rlwinm  r5,r4,0,16,14
 477         mtspr   SPRN_HID1,r5
 478                 /* Wait for PLL to stabilize */
 479         mftbl   r5
 480 3:      mftbl   r6
 481         sub     r6,r6,r5
 482         cmplwi  cr0,r6,10000
 483         ble     3b
 484         /* Setup final PLL */
 485         mtspr   SPRN_HID1,r4
 486 1:
 487         mtcr    r7
 488         blr
 489