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
215 andis. r11,r11,L3CR_L3E@h
217 END_FTR_SECTION_IFSET(CPU_FTR_L3CR)
218 lwz r6,CPU_SPEC_FEATURES(r5)
219 andi. r0,r6,CPU_FTR_L3_DISABLE_NAP
221 li r7,CPU_FTR_CAN_NAP
223 stw r6,CPU_SPEC_FEATURES(r5)
227 /* All of the bits we have to set.....
229 ori r11,r11,HID0_SGE | HID0_FOLD | HID0_BHTE
230 ori r11,r11,HID0_LRSTK | HID0_BTIC
231 oris r11,r11,HID0_DPM@h
233 xori r11,r11,HID0_BTIC
234 END_FTR_SECTION_IFSET(CPU_FTR_NO_BTIC)
236 xoris r11,r11,HID0_DPM@h /* disable dynamic power mgmt */
237 END_FTR_SECTION_IFSET(CPU_FTR_NO_DPM)
239 /* All of the bits we have to clear....
241 li r3,HID0_SPD | HID0_NOPDST | HID0_NOPTI
242 andc r11,r11,r3 /* clear SPD: enable speculative */
245 mtspr SPRN_ICTC,r3 /* Instruction Cache Throttling off */
251 /* Enable L2 HW prefetch, if L2 is enabled
254 andis. r3,r3,L2CR_L2E@h
265 * Initialize the FPU registers. This is needed to work around an errata
266 * in some 750 cpus where using a not yet initialized FPU register after
267 * power on reset may hang the CPU
269 _GLOBAL(__init_fpu_registers)
274 addis r9,r3,empty_zero_page@ha
275 addi r9,r9,empty_zero_page@l
283 /* Definitions for the table use to save CPU states */
295 .balign L1_CACHE_BYTES
298 .balign L1_CACHE_BYTES,0
301 /* Called in normal context to backup CPU 0 state. This
302 * does not include cache settings. This function is also
303 * called for machine sleep. This does not include the MMU
304 * setup, BATs, etc... but rather the "special" registers
305 * like HID0, HID1, MSSCR0, etc...
307 _GLOBAL(__save_cpu_setup)
308 /* Some CR fields are volatile, we back it up all */
311 /* Get storage ptr */
312 lis r5,cpu_state_storage@h
313 ori r5,r5,cpu_state_storage@l
315 /* Save HID0 (common to all CONFIG_6xx cpus) */
319 /* Now deal with CPU type dependent registers */
322 cmplwi cr0,r3,0x8000 /* 7450 */
323 cmplwi cr1,r3,0x000c /* 7400 */
324 cmplwi cr2,r3,0x800c /* 7410 */
325 cmplwi cr3,r3,0x8001 /* 7455 */
326 cmplwi cr4,r3,0x8002 /* 7457 */
327 cmplwi cr5,r3,0x8003 /* 7447A */
328 cmplwi cr6,r3,0x7000 /* 750FX */
329 cmplwi cr7,r3,0x8004 /* 7448 */
330 /* cr1 is 7400 || 7410 */
331 cror 4*cr1+eq,4*cr1+eq,4*cr2+eq
333 cror 4*cr0+eq,4*cr0+eq,4*cr3+eq
334 cror 4*cr0+eq,4*cr0+eq,4*cr4+eq
335 cror 4*cr0+eq,4*cr0+eq,4*cr1+eq
336 cror 4*cr0+eq,4*cr0+eq,4*cr5+eq
337 cror 4*cr0+eq,4*cr0+eq,4*cr7+eq
339 /* Backup 74xx specific regs */
345 /* Backup 745x specific registers */
356 /* Backup 750FX specific registers */
359 /* If rev 2.x, backup HID2 */
370 /* Called with no MMU context (typically MSR:IR/DR off) to
371 * restore CPU state as backed up by the previous
372 * function. This does not include cache setting
374 _GLOBAL(__restore_cpu_setup)
375 /* Some CR fields are volatile, we back it up all */
378 /* Get storage ptr */
379 lis r5,(cpu_state_storage-KERNELBASE)@h
380 ori r5,r5,cpu_state_storage@l
390 /* Now deal with CPU type dependent registers */
393 cmplwi cr0,r3,0x8000 /* 7450 */
394 cmplwi cr1,r3,0x000c /* 7400 */
395 cmplwi cr2,r3,0x800c /* 7410 */
396 cmplwi cr3,r3,0x8001 /* 7455 */
397 cmplwi cr4,r3,0x8002 /* 7457 */
398 cmplwi cr5,r3,0x8003 /* 7447A */
399 cmplwi cr6,r3,0x7000 /* 750FX */
400 cmplwi cr7,r3,0x8004 /* 7448 */
401 /* cr1 is 7400 || 7410 */
402 cror 4*cr1+eq,4*cr1+eq,4*cr2+eq
404 cror 4*cr0+eq,4*cr0+eq,4*cr3+eq
405 cror 4*cr0+eq,4*cr0+eq,4*cr4+eq
406 cror 4*cr0+eq,4*cr0+eq,4*cr1+eq
407 cror 4*cr0+eq,4*cr0+eq,4*cr5+eq
408 cror 4*cr0+eq,4*cr0+eq,4*cr7+eq
410 /* Restore 74xx specific regs */
422 /* Clear 7410 L2CR2 */
426 /* Restore 745x specific registers */
448 /* Restore 750FX specific registers
449 * that is restore HID2 on rev 2.x and PLL config & switch
452 /* If rev 2.x, restore HID2 with low voltage bit cleared */
465 /* Wait for PLL to stabilize */
471 /* Setup final PLL */