2 * This file contains sleep low-level functions for PowerBook G3.
3 * Copyright (C) 1999 Benjamin Herrenschmidt (benh@kernel.crashing.org)
4 * and Paul Mackerras (paulus@samba.org).
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
13 #include <asm/processor.h>
15 #include <asm/ppc_asm.h>
16 #include <asm/cputable.h>
17 #include <asm/cache.h>
18 #include <asm/thread_info.h>
19 #include <asm/asm-offsets.h>
21 #define MAGIC 0x4c617273 /* 'Lars' */
24 * Structure for storing CPU registers on the stack.
30 #define SL_SPRG0 0x10 /* 4 sprg's */
42 #define SL_R12 0x70 /* r12 to r31 */
43 #define SL_SIZE (SL_R12 + 80)
48 #if defined(CONFIG_PM) || defined(CONFIG_CPU_FREQ_PMAC)
50 /* This gets called by via-pmu.c late during the sleep process.
51 * The PMU was already send the sleep command and will shut us down
52 * soon. We need to save all that is needed and setup the wakeup
53 * vector that will be called by the ROM on wakeup
55 _GLOBAL(low_sleep_handler)
73 /* Get a stable timebase and save it */
90 stw r4,SL_SPRG0+12(r1)
100 stw r4,SL_DBAT1+4(r1)
104 stw r4,SL_DBAT2+4(r1)
108 stw r4,SL_DBAT3+4(r1)
112 stw r4,SL_IBAT0+4(r1)
116 stw r4,SL_IBAT1+4(r1)
120 stw r4,SL_IBAT2+4(r1)
124 stw r4,SL_IBAT3+4(r1)
126 /* Backup various CPU config stuffs */
129 /* The ROM can wake us up via 2 different vectors:
130 * - On wallstreet & lombard, we must write a magic
131 * value 'Lars' at address 4 and a pointer to a
132 * memory location containing the PC to resume from
134 * - On Core99, we must store the wakeup vector at
135 * address 0x80 and eventually it's parameters
136 * at address 0x84. I've have some trouble with those
137 * parameters however and I no longer use them.
139 lis r5,grackle_wake_up@ha
140 addi r5,r5,grackle_wake_up@l
150 /* Setup stuffs at 0x80-0x84 for Core99 */
151 lis r3,core99_wake_up@ha
152 addi r3,r3,core99_wake_up@l
156 /* Store a pointer to our backup storage into
159 lis r3,sleep_storage@ha
160 addi r3,r3,sleep_storage@l
165 /* Flush & disable all caches */
166 bl flush_disable_caches
168 /* Turn off data relocation. */
169 mfmsr r3 /* Save MSR in r7 */
170 rlwinm r3,r3,0,28,26 /* Turn off DR bit */
176 /* Flush any pending L2 data prefetches to work around HW bug */
179 lwz r0,0(r3) /* perform cache-inhibited load to ROM */
180 sync /* (caches are disabled at this point) */
181 END_FTR_SECTION_IFSET(CPU_FTR_SPEC7450)
184 * Set the HID0 and MSR for sleep.
187 rlwinm r2,r2,0,10,7 /* clear doze, nap */
188 oris r2,r2,HID0_SLEEP@h
194 /* This loop puts us back to sleep in case we have a spurrious
195 * wakeup so that the host bridge properly stays asleep. The
196 * CPU will be turned off, either after a known time (about 1
197 * second) on wallstreet & lombard, or as soon as the CPU enters
198 * SLEEP mode on core99
208 * Here is the resume code.
213 * Core99 machines resume here
214 * r4 has the physical address of SL_PC(sp) (unused)
216 _GLOBAL(core99_wake_up)
217 /* Make sure HID0 no longer contains any sleep bit and that data cache
221 rlwinm r3,r3,0,11,7 /* clear SLEEP, NAP, DOZE bits */
222 rlwinm 3,r3,0,18,15 /* clear DCE, ICE */
229 ori r3,r3,MSR_EE|MSR_IP
230 xori r3,r3,MSR_EE|MSR_IP
237 /* Recover sleep storage */
238 lis r3,sleep_storage@ha
239 addi r3,r3,sleep_storage@l
243 /* Pass thru to older resume code ... */
245 * Here is the resume code for older machines.
246 * r1 has the physical address of SL_PC(sp).
251 /* Restore the kernel's segment registers before
252 * we do any r1 memory access as we are not sure they
253 * are in a sane state above the first 256Mb region
255 li r0,16 /* load up segment register values */
256 mtctr r0 /* for context 0 */
257 lis r3,0x2000 /* Ku = 1, VSID = 0 */
260 addi r3,r3,0x111 /* increment VSID */
261 addis r4,r4,0x1000 /* address of next segment */
268 /* Restore various CPU config stuffs */
269 bl __restore_cpu_setup
271 /* Make sure all FPRs have been initialized */
273 bl __init_fpu_registers
275 /* Invalidate & enable L1 cache, we don't care about
276 * whatever the ROM may have tried to write to memory
280 /* Restore the BATs, and SDR1. Then we can turn on the MMU. */
285 lwz r4,SL_SPRG0+4(r1)
287 lwz r4,SL_SPRG0+8(r1)
289 lwz r4,SL_SPRG0+12(r1)
294 lwz r4,SL_DBAT0+4(r1)
298 lwz r4,SL_DBAT1+4(r1)
302 lwz r4,SL_DBAT2+4(r1)
306 lwz r4,SL_DBAT3+4(r1)
310 lwz r4,SL_IBAT0+4(r1)
314 lwz r4,SL_IBAT1+4(r1)
318 lwz r4,SL_IBAT2+4(r1)
322 lwz r4,SL_IBAT3+4(r1)
343 END_FTR_SECTION_IFSET(CPU_FTR_HAS_HIGH_BATS)
347 1: addic. r4,r4,-0x1000
352 /* restore the MSR and turn on the MMU */
356 /* get back the stack pointer */
367 /* Restore the callee-saved registers and return */
386 #endif /* defined(CONFIG_PM) || defined(CONFIG_CPU_FREQ) */
389 .balign L1_CACHE_BYTES
392 .balign L1_CACHE_BYTES, 0
394 #endif /* CONFIG_6xx */