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>
22 #define MAGIC 0x4c617273 /* 'Lars' */
25 * Structure for storing CPU registers on the stack.
31 #define SL_SPRG0 0x10 /* 4 sprg's */
43 #define SL_R12 0x70 /* r12 to r31 */
44 #define SL_SIZE (SL_R12 + 80)
49 #if defined(CONFIG_PM) || defined(CONFIG_CPU_FREQ_PMAC) || \
50 (defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32))
52 /* This gets called by via-pmu.c late during the sleep process.
53 * The PMU was already send the sleep command and will shut us down
54 * soon. We need to save all that is needed and setup the wakeup
55 * vector that will be called by the ROM on wakeup
57 _GLOBAL(low_sleep_handler)
75 /* Get a stable timebase and save it */
92 stw r4,SL_SPRG0+12(r1)
102 stw r4,SL_DBAT1+4(r1)
106 stw r4,SL_DBAT2+4(r1)
110 stw r4,SL_DBAT3+4(r1)
114 stw r4,SL_IBAT0+4(r1)
118 stw r4,SL_IBAT1+4(r1)
122 stw r4,SL_IBAT2+4(r1)
126 stw r4,SL_IBAT3+4(r1)
128 /* Backup various CPU config stuffs */
131 /* The ROM can wake us up via 2 different vectors:
132 * - On wallstreet & lombard, we must write a magic
133 * value 'Lars' at address 4 and a pointer to a
134 * memory location containing the PC to resume from
136 * - On Core99, we must store the wakeup vector at
137 * address 0x80 and eventually it's parameters
138 * at address 0x84. I've have some trouble with those
139 * parameters however and I no longer use them.
141 lis r5,grackle_wake_up@ha
142 addi r5,r5,grackle_wake_up@l
152 /* Setup stuffs at 0x80-0x84 for Core99 */
153 lis r3,core99_wake_up@ha
154 addi r3,r3,core99_wake_up@l
158 /* Store a pointer to our backup storage into
161 lis r3,sleep_storage@ha
162 addi r3,r3,sleep_storage@l
167 /* Flush & disable all caches */
168 bl flush_disable_caches
170 /* Turn off data relocation. */
171 mfmsr r3 /* Save MSR in r7 */
172 rlwinm r3,r3,0,28,26 /* Turn off DR bit */
178 /* Flush any pending L2 data prefetches to work around HW bug */
181 lwz r0,0(r3) /* perform cache-inhibited load to ROM */
182 sync /* (caches are disabled at this point) */
183 END_FTR_SECTION_IFSET(CPU_FTR_SPEC7450)
186 * Set the HID0 and MSR for sleep.
189 rlwinm r2,r2,0,10,7 /* clear doze, nap */
190 oris r2,r2,HID0_SLEEP@h
196 /* This loop puts us back to sleep in case we have a spurrious
197 * wakeup so that the host bridge properly stays asleep. The
198 * CPU will be turned off, either after a known time (about 1
199 * second) on wallstreet & lombard, or as soon as the CPU enters
200 * SLEEP mode on core99
210 * Here is the resume code.
215 * Core99 machines resume here
216 * r4 has the physical address of SL_PC(sp) (unused)
218 _GLOBAL(core99_wake_up)
219 /* Make sure HID0 no longer contains any sleep bit and that data cache
223 rlwinm r3,r3,0,11,7 /* clear SLEEP, NAP, DOZE bits */
224 rlwinm 3,r3,0,18,15 /* clear DCE, ICE */
231 ori r3,r3,MSR_EE|MSR_IP
232 xori r3,r3,MSR_EE|MSR_IP
239 /* Recover sleep storage */
240 lis r3,sleep_storage@ha
241 addi r3,r3,sleep_storage@l
245 /* Pass thru to older resume code ... */
247 * Here is the resume code for older machines.
248 * r1 has the physical address of SL_PC(sp).
253 /* Restore the kernel's segment registers before
254 * we do any r1 memory access as we are not sure they
255 * are in a sane state above the first 256Mb region
257 li r0,16 /* load up segment register values */
258 mtctr r0 /* for context 0 */
259 lis r3,0x2000 /* Ku = 1, VSID = 0 */
262 addi r3,r3,0x111 /* increment VSID */
263 addis r4,r4,0x1000 /* address of next segment */
270 /* Restore various CPU config stuffs */
271 bl __restore_cpu_setup
273 /* Make sure all FPRs have been initialized */
275 bl __init_fpu_registers
277 /* Invalidate & enable L1 cache, we don't care about
278 * whatever the ROM may have tried to write to memory
282 /* Restore the BATs, and SDR1. Then we can turn on the MMU. */
287 lwz r4,SL_SPRG0+4(r1)
289 lwz r4,SL_SPRG0+8(r1)
291 lwz r4,SL_SPRG0+12(r1)
296 lwz r4,SL_DBAT0+4(r1)
300 lwz r4,SL_DBAT1+4(r1)
304 lwz r4,SL_DBAT2+4(r1)
308 lwz r4,SL_DBAT3+4(r1)
312 lwz r4,SL_IBAT0+4(r1)
316 lwz r4,SL_IBAT1+4(r1)
320 lwz r4,SL_IBAT2+4(r1)
324 lwz r4,SL_IBAT3+4(r1)
327 BEGIN_MMU_FTR_SECTION
345 END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)
349 1: addic. r4,r4,-0x1000
354 /* restore the MSR and turn on the MMU */
358 /* get back the stack pointer */
369 /* Restore the callee-saved registers and return */
388 #endif /* defined(CONFIG_PM) || defined(CONFIG_CPU_FREQ) */
391 .balign L1_CACHE_BYTES
394 .balign L1_CACHE_BYTES, 0
396 #endif /* CONFIG_6xx */