2 * This file contains low level CPU setup functions.
3 * Copyright (C) 2003 Benjamin Herrenschmidt (benh@kernel.crashing.org)
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.
12 #include <asm/processor.h>
14 #include <asm/cputable.h>
15 #include <asm/ppc_asm.h>
16 #include <asm/asm-offsets.h>
17 #include <asm/cache.h>
19 #include <asm/feature-fixups.h>
21 _GLOBAL(__setup_cpu_603)
25 mtspr SPRN_SPRG_603_LRU,r10 /* init SW LRU tracking */
26 END_MMU_FTR_SECTION_IFSET(MMU_FTR_NEED_DTLB_SW_LRU)
29 bl __init_fpu_registers
30 END_FTR_SECTION_IFCLR(CPU_FTR_FPU_UNAVAILABLE)
31 bl setup_common_caches
34 _GLOBAL(__setup_cpu_604)
36 bl setup_common_caches
40 _GLOBAL(__setup_cpu_750)
42 bl __init_fpu_registers
43 bl setup_common_caches
44 bl setup_750_7400_hid0
47 _GLOBAL(__setup_cpu_750cx)
49 bl __init_fpu_registers
50 bl setup_common_caches
51 bl setup_750_7400_hid0
55 _GLOBAL(__setup_cpu_750fx)
57 bl __init_fpu_registers
58 bl setup_common_caches
59 bl setup_750_7400_hid0
63 _GLOBAL(__setup_cpu_7400)
65 bl __init_fpu_registers
66 bl setup_7400_workarounds
67 bl setup_common_caches
68 bl setup_750_7400_hid0
71 _GLOBAL(__setup_cpu_7410)
73 bl __init_fpu_registers
74 bl setup_7410_workarounds
75 bl setup_common_caches
76 bl setup_750_7400_hid0
81 _GLOBAL(__setup_cpu_745x)
83 bl setup_common_caches
84 bl setup_745x_specifics
88 /* Enable caches for 603's, 604, 750 & 7400 */
92 ori r11,r11,HID0_ICE|HID0_DCE
94 bne 1f /* don't invalidate the D-cache */
95 ori r8,r8,HID0_DCI /* unless it wasn't enabled */
97 mtspr SPRN_HID0,r8 /* enable and invalidate caches */
99 mtspr SPRN_HID0,r11 /* enable caches */
104 /* 604, 604e, 604ev, ...
105 * Enable superscalar execution & branch history table
109 ori r11,r11,HID0_SIED|HID0_BHTE
112 mtspr SPRN_HID0,r8 /* flush branch target address cache */
113 sync /* on 604e/604r */
119 /* 7400 <= rev 2.7 and 7410 rev = 1.0 suffer from some
120 * erratas we work around here.
121 * Moto MPC710CE.pdf describes them, those are errata
123 * Note that we assume the firmware didn't choose to
124 * apply other workarounds (there are other ones documented
125 * in the .pdf). It appear that Apple firmware only works
126 * around #3 and with the same fix we use. We may want to
127 * check if the CPU is using 60x bus mode in which case
128 * the workaround for errata #4 is useless. Also, we may
129 * want to explicitly clear HID0_NOPDST as this is not
130 * needed once we have applied workaround #5 (though it's
131 * not set by Apple's firmware at least).
133 setup_7400_workarounds:
139 setup_7410_workarounds:
145 mfspr r11,SPRN_MSSSR0
146 /* Errata #3: Set L1OPQ_SIZE to 0x10 */
149 /* Errata #4: Set L2MQ_SIZE to 1 (check for MPX mode first ?) */
151 /* Errata #5: Set DRLT_SIZE to 0x01 */
155 mtspr SPRN_MSSSR0,r11
161 * Enable Store Gathering (SGE), Address Broadcast (ABE),
162 * Branch History Table (BHTE), Branch Target ICache (BTIC)
163 * Dynamic Power Management (DPM), Speculative (SPD)
164 * Clear Instruction cache throttling (ICTC)
168 ori r11,r11,HID0_SGE | HID0_ABE | HID0_BHTE | HID0_BTIC
169 oris r11,r11,HID0_DPM@h
171 xori r11,r11,HID0_BTIC
172 END_FTR_SECTION_IFSET(CPU_FTR_NO_BTIC)
174 xoris r11,r11,HID0_DPM@h /* disable dynamic power mgmt */
175 END_FTR_SECTION_IFSET(CPU_FTR_NO_DPM)
177 andc r11,r11,r3 /* clear SPD: enable speculative */
179 mtspr SPRN_ICTC,r3 /* Instruction Cache Throttling off */
187 * Looks like we have to disable NAP feature for some PLL settings...
188 * (waiting for confirmation)
192 rlwinm r10,r10,4,28,31
196 cror 4*cr0+eq,4*cr0+eq,4*cr1+eq
197 cror 4*cr0+eq,4*cr0+eq,4*cr2+eq
199 lwz r6,CPU_SPEC_FEATURES(r4)
200 li r7,CPU_FTR_CAN_NAP
202 stw r6,CPU_SPEC_FEATURES(r4)
211 * Enable Store Gathering (SGE), Branch Folding (FOLD)
212 * Branch History Table (BHTE), Branch Target ICache (BTIC)
213 * Dynamic Power Management (DPM), Speculative (SPD)
214 * Ensure our data cache instructions really operate.
215 * Timebase has to be running or we wouldn't have made it here,
216 * just ensure we don't disable it.
217 * Clear Instruction cache throttling (ICTC)
218 * Enable L2 HW prefetch
220 setup_745x_specifics:
221 /* We check for the presence of an L3 cache setup by
222 * the firmware. If any, we disable NAP capability as
223 * it's known to be bogus on rev 2.1 and earlier
227 andis. r11,r11,L3CR_L3E@h
229 END_FTR_SECTION_IFSET(CPU_FTR_L3CR)
230 lwz r6,CPU_SPEC_FEATURES(r4)
231 andis. r0,r6,CPU_FTR_L3_DISABLE_NAP@h
233 li r7,CPU_FTR_CAN_NAP
235 stw r6,CPU_SPEC_FEATURES(r4)
239 /* All of the bits we have to set.....
241 ori r11,r11,HID0_SGE | HID0_FOLD | HID0_BHTE
242 ori r11,r11,HID0_LRSTK | HID0_BTIC
243 oris r11,r11,HID0_DPM@h
244 BEGIN_MMU_FTR_SECTION
245 oris r11,r11,HID0_HIGH_BAT@h
246 END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)
248 xori r11,r11,HID0_BTIC
249 END_FTR_SECTION_IFSET(CPU_FTR_NO_BTIC)
251 xoris r11,r11,HID0_DPM@h /* disable dynamic power mgmt */
252 END_FTR_SECTION_IFSET(CPU_FTR_NO_DPM)
254 /* All of the bits we have to clear....
256 li r3,HID0_SPD | HID0_NOPDST | HID0_NOPTI
257 andc r11,r11,r3 /* clear SPD: enable speculative */
260 mtspr SPRN_ICTC,r3 /* Instruction Cache Throttling off */
266 /* Enable L2 HW prefetch, if L2 is enabled
269 andis. r3,r3,L2CR_L2E@h
280 * Initialize the FPU registers. This is needed to work around an errata
281 * in some 750 cpus where using a not yet initialized FPU register after
282 * power on reset may hang the CPU
284 _GLOBAL(__init_fpu_registers)
289 addis r9,r3,empty_zero_page@ha
290 addi r9,r9,empty_zero_page@l
298 /* Definitions for the table use to save CPU states */
310 .balign L1_CACHE_BYTES
313 .balign L1_CACHE_BYTES,0
316 /* Called in normal context to backup CPU 0 state. This
317 * does not include cache settings. This function is also
318 * called for machine sleep. This does not include the MMU
319 * setup, BATs, etc... but rather the "special" registers
320 * like HID0, HID1, MSSCR0, etc...
322 _GLOBAL(__save_cpu_setup)
323 /* Some CR fields are volatile, we back it up all */
326 /* Get storage ptr */
327 lis r5,cpu_state_storage@h
328 ori r5,r5,cpu_state_storage@l
330 /* Save HID0 (common to all CONFIG_PPC_BOOK3S_32 cpus) */
334 /* Now deal with CPU type dependent registers */
337 cmplwi cr0,r3,0x8000 /* 7450 */
338 cmplwi cr1,r3,0x000c /* 7400 */
339 cmplwi cr2,r3,0x800c /* 7410 */
340 cmplwi cr3,r3,0x8001 /* 7455 */
341 cmplwi cr4,r3,0x8002 /* 7457 */
342 cmplwi cr5,r3,0x8003 /* 7447A */
343 cmplwi cr6,r3,0x7000 /* 750FX */
344 cmplwi cr7,r3,0x8004 /* 7448 */
345 /* cr1 is 7400 || 7410 */
346 cror 4*cr1+eq,4*cr1+eq,4*cr2+eq
348 cror 4*cr0+eq,4*cr0+eq,4*cr3+eq
349 cror 4*cr0+eq,4*cr0+eq,4*cr4+eq
350 cror 4*cr0+eq,4*cr0+eq,4*cr1+eq
351 cror 4*cr0+eq,4*cr0+eq,4*cr5+eq
352 cror 4*cr0+eq,4*cr0+eq,4*cr7+eq
354 /* Backup 74xx specific regs */
360 /* Backup 745x specific registers */
371 /* Backup 750FX specific registers */
374 /* If rev 2.x, backup HID2 */
385 /* Called with no MMU context (typically MSR:IR/DR off) to
386 * restore CPU state as backed up by the previous
387 * function. This does not include cache setting
389 _GLOBAL(__restore_cpu_setup)
390 /* Some CR fields are volatile, we back it up all */
393 /* Get storage ptr */
394 lis r5,(cpu_state_storage-KERNELBASE)@h
395 ori r5,r5,cpu_state_storage@l
405 /* Now deal with CPU type dependent registers */
408 cmplwi cr0,r3,0x8000 /* 7450 */
409 cmplwi cr1,r3,0x000c /* 7400 */
410 cmplwi cr2,r3,0x800c /* 7410 */
411 cmplwi cr3,r3,0x8001 /* 7455 */
412 cmplwi cr4,r3,0x8002 /* 7457 */
413 cmplwi cr5,r3,0x8003 /* 7447A */
414 cmplwi cr6,r3,0x7000 /* 750FX */
415 cmplwi cr7,r3,0x8004 /* 7448 */
416 /* cr1 is 7400 || 7410 */
417 cror 4*cr1+eq,4*cr1+eq,4*cr2+eq
419 cror 4*cr0+eq,4*cr0+eq,4*cr3+eq
420 cror 4*cr0+eq,4*cr0+eq,4*cr4+eq
421 cror 4*cr0+eq,4*cr0+eq,4*cr1+eq
422 cror 4*cr0+eq,4*cr0+eq,4*cr5+eq
423 cror 4*cr0+eq,4*cr0+eq,4*cr7+eq
425 /* Restore 74xx specific regs */
437 /* Clear 7410 L2CR2 */
441 /* Restore 745x specific registers */
463 /* Restore 750FX specific registers
464 * that is restore HID2 on rev 2.x and PLL config & switch
467 /* If rev 2.x, restore HID2 with low voltage bit cleared */
480 /* Wait for PLL to stabilize */
486 /* Setup final PLL */