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 <linux/config.h>
13 #include <asm/processor.h>
15 #include <asm/cputable.h>
16 #include <asm/ppc_asm.h>
17 #include <asm/asm-offsets.h>
18 #include <asm/cache.h>
20 _GLOBAL(__setup_cpu_603)
22 _GLOBAL(__setup_cpu_604)
24 bl setup_common_caches
28 _GLOBAL(__setup_cpu_750)
30 bl __init_fpu_registers
31 bl setup_common_caches
32 bl setup_750_7400_hid0
35 _GLOBAL(__setup_cpu_750cx)
37 bl __init_fpu_registers
38 bl setup_common_caches
39 bl setup_750_7400_hid0
43 _GLOBAL(__setup_cpu_750fx)
45 bl __init_fpu_registers
46 bl setup_common_caches
47 bl setup_750_7400_hid0
51 _GLOBAL(__setup_cpu_7400)
53 bl __init_fpu_registers
54 bl setup_7400_workarounds
55 bl setup_common_caches
56 bl setup_750_7400_hid0
59 _GLOBAL(__setup_cpu_7410)
61 bl __init_fpu_registers
62 bl setup_7410_workarounds
63 bl setup_common_caches
64 bl setup_750_7400_hid0
69 _GLOBAL(__setup_cpu_745x)
71 bl setup_common_caches
72 bl setup_745x_specifics
76 /* Enable caches for 603's, 604, 750 & 7400 */
80 ori r11,r11,HID0_ICE|HID0_DCE
82 bne 1f /* don't invalidate the D-cache */
83 ori r8,r8,HID0_DCI /* unless it wasn't enabled */
85 mtspr SPRN_HID0,r8 /* enable and invalidate caches */
87 mtspr SPRN_HID0,r11 /* enable caches */
92 /* 604, 604e, 604ev, ...
93 * Enable superscalar execution & branch history table
97 ori r11,r11,HID0_SIED|HID0_BHTE
100 mtspr SPRN_HID0,r8 /* flush branch target address cache */
101 sync /* on 604e/604r */
107 /* 7400 <= rev 2.7 and 7410 rev = 1.0 suffer from some
108 * erratas we work around here.
109 * Moto MPC710CE.pdf describes them, those are errata
111 * Note that we assume the firmware didn't choose to
112 * apply other workarounds (there are other ones documented
113 * in the .pdf). It appear that Apple firmware only works
114 * around #3 and with the same fix we use. We may want to
115 * check if the CPU is using 60x bus mode in which case
116 * the workaround for errata #4 is useless. Also, we may
117 * want to explicitely clear HID0_NOPDST as this is not
118 * needed once we have applied workaround #5 (though it's
119 * not set by Apple's firmware at least).
121 setup_7400_workarounds:
127 setup_7410_workarounds:
133 mfspr r11,SPRN_MSSSR0
134 /* Errata #3: Set L1OPQ_SIZE to 0x10 */
137 /* Errata #4: Set L2MQ_SIZE to 1 (check for MPX mode first ?) */
139 /* Errata #5: Set DRLT_SIZE to 0x01 */
143 mtspr SPRN_MSSSR0,r11
149 * Enable Store Gathering (SGE), Address Brodcast (ABE),
150 * Branch History Table (BHTE), Branch Target ICache (BTIC)
151 * Dynamic Power Management (DPM), Speculative (SPD)
152 * Clear Instruction cache throttling (ICTC)
156 ori r11,r11,HID0_SGE | HID0_ABE | HID0_BHTE | HID0_BTIC
157 oris r11,r11,HID0_DPM@h
159 xori r11,r11,HID0_BTIC
160 END_FTR_SECTION_IFSET(CPU_FTR_NO_BTIC)
162 xoris r11,r11,HID0_DPM@h /* disable dynamic power mgmt */
163 END_FTR_SECTION_IFSET(CPU_FTR_NO_DPM)
165 andc r11,r11,r3 /* clear SPD: enable speculative */
167 mtspr SPRN_ICTC,r3 /* Instruction Cache Throttling off */
175 * Looks like we have to disable NAP feature for some PLL settings...
176 * (waiting for confirmation)
180 rlwinm r10,r10,4,28,31
184 cror 4*cr0+eq,4*cr0+eq,4*cr1+eq
185 cror 4*cr0+eq,4*cr0+eq,4*cr2+eq
187 lwz r6,CPU_SPEC_FEATURES(r5)
188 li r7,CPU_FTR_CAN_NAP
190 stw r6,CPU_SPEC_FEATURES(r5)
199 * Enable Store Gathering (SGE), Branch Folding (FOLD)
200 * Branch History Table (BHTE), Branch Target ICache (BTIC)
201 * Dynamic Power Management (DPM), Speculative (SPD)
202 * Ensure our data cache instructions really operate.
203 * Timebase has to be running or we wouldn't have made it here,
204 * just ensure we don't disable it.
205 * Clear Instruction cache throttling (ICTC)
206 * Enable L2 HW prefetch
208 setup_745x_specifics:
209 /* We check for the presence of an L3 cache setup by
210 * the firmware. If any, we disable NAP capability as
211 * it's known to be bogus on rev 2.1 and earlier
214 andis. r11,r11,L3CR_L3E@h
216 lwz r6,CPU_SPEC_FEATURES(r5)
217 andi. r0,r6,CPU_FTR_L3_DISABLE_NAP
219 li r7,CPU_FTR_CAN_NAP
221 stw r6,CPU_SPEC_FEATURES(r5)
225 /* All of the bits we have to set.....
227 ori r11,r11,HID0_SGE | HID0_FOLD | HID0_BHTE
228 ori r11,r11,HID0_LRSTK | HID0_BTIC
229 oris r11,r11,HID0_DPM@h
231 xori r11,r11,HID0_BTIC
232 END_FTR_SECTION_IFSET(CPU_FTR_NO_BTIC)
234 xoris r11,r11,HID0_DPM@h /* disable dynamic power mgmt */
235 END_FTR_SECTION_IFSET(CPU_FTR_NO_DPM)
237 /* All of the bits we have to clear....
239 li r3,HID0_SPD | HID0_NOPDST | HID0_NOPTI
240 andc r11,r11,r3 /* clear SPD: enable speculative */
243 mtspr SPRN_ICTC,r3 /* Instruction Cache Throttling off */
249 /* Enable L2 HW prefetch, if L2 is enabled
252 andis. r3,r3,L2CR_L2E@h
263 * Initialize the FPU registers. This is needed to work around an errata
264 * in some 750 cpus where using a not yet initialized FPU register after
265 * power on reset may hang the CPU
267 _GLOBAL(__init_fpu_registers)
272 addis r9,r3,empty_zero_page@ha
273 addi r9,r9,empty_zero_page@l
281 /* Definitions for the table use to save CPU states */
293 .balign L1_CACHE_BYTES
296 .balign L1_CACHE_BYTES,0
299 /* Called in normal context to backup CPU 0 state. This
300 * does not include cache settings. This function is also
301 * called for machine sleep. This does not include the MMU
302 * setup, BATs, etc... but rather the "special" registers
303 * like HID0, HID1, MSSCR0, etc...
305 _GLOBAL(__save_cpu_setup)
306 /* Some CR fields are volatile, we back it up all */
309 /* Get storage ptr */
310 lis r5,cpu_state_storage@h
311 ori r5,r5,cpu_state_storage@l
313 /* Save HID0 (common to all CONFIG_6xx cpus) */
317 /* Now deal with CPU type dependent registers */
320 cmplwi cr0,r3,0x8000 /* 7450 */
321 cmplwi cr1,r3,0x000c /* 7400 */
322 cmplwi cr2,r3,0x800c /* 7410 */
323 cmplwi cr3,r3,0x8001 /* 7455 */
324 cmplwi cr4,r3,0x8002 /* 7457 */
325 cmplwi cr5,r3,0x8003 /* 7447A */
326 cmplwi cr6,r3,0x7000 /* 750FX */
327 cmplwi cr7,r3,0x8004 /* 7448 */
328 /* cr1 is 7400 || 7410 */
329 cror 4*cr1+eq,4*cr1+eq,4*cr2+eq
331 cror 4*cr0+eq,4*cr0+eq,4*cr3+eq
332 cror 4*cr0+eq,4*cr0+eq,4*cr4+eq
333 cror 4*cr0+eq,4*cr0+eq,4*cr1+eq
334 cror 4*cr0+eq,4*cr0+eq,4*cr5+eq
335 cror 4*cr0+eq,4*cr0+eq,4*cr7+eq
337 /* Backup 74xx specific regs */
343 /* Backup 745x specific registers */
354 /* Backup 750FX specific registers */
357 /* If rev 2.x, backup HID2 */
368 /* Called with no MMU context (typically MSR:IR/DR off) to
369 * restore CPU state as backed up by the previous
370 * function. This does not include cache setting
372 _GLOBAL(__restore_cpu_setup)
373 /* Some CR fields are volatile, we back it up all */
376 /* Get storage ptr */
377 lis r5,(cpu_state_storage-KERNELBASE)@h
378 ori r5,r5,cpu_state_storage@l
388 /* Now deal with CPU type dependent registers */
391 cmplwi cr0,r3,0x8000 /* 7450 */
392 cmplwi cr1,r3,0x000c /* 7400 */
393 cmplwi cr2,r3,0x800c /* 7410 */
394 cmplwi cr3,r3,0x8001 /* 7455 */
395 cmplwi cr4,r3,0x8002 /* 7457 */
396 cmplwi cr5,r3,0x8003 /* 7447A */
397 cmplwi cr6,r3,0x7000 /* 750FX */
398 cmplwi cr7,r3,0x8004 /* 7448 */
399 /* cr1 is 7400 || 7410 */
400 cror 4*cr1+eq,4*cr1+eq,4*cr2+eq
402 cror 4*cr0+eq,4*cr0+eq,4*cr3+eq
403 cror 4*cr0+eq,4*cr0+eq,4*cr4+eq
404 cror 4*cr0+eq,4*cr0+eq,4*cr1+eq
405 cror 4*cr0+eq,4*cr0+eq,4*cr5+eq
406 cror 4*cr0+eq,4*cr0+eq,4*cr7+eq
408 /* Restore 74xx specific regs */
420 /* Clear 7410 L2CR2 */
424 /* Restore 745x specific registers */
446 /* Restore 750FX specific registers
447 * that is restore HID2 on rev 2.x and PLL config & switch
450 /* If rev 2.x, restore HID2 with low voltage bit cleared */
463 /* Wait for PLL to stabilize */
469 /* Setup final PLL */