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 <linux/config.h>
14 #include <asm/processor.h>
16 #include <asm/ppc_asm.h>
17 #include <asm/cputable.h>
18 #include <asm/cache.h>
19 #include <asm/thread_info.h>
20 #include <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)
51 /* This gets called by via-pmu.c late during the sleep process.
52 * The PMU was already send the sleep command and will shut us down
53 * soon. We need to save all that is needed and setup the wakeup
54 * vector that will be called by the ROM on wakeup
56 _GLOBAL(low_sleep_handler)
74 /* Get a stable timebase and save it */
91 stw r4,SL_SPRG0+12(r1)
101 stw r4,SL_DBAT1+4(r1)
105 stw r4,SL_DBAT2+4(r1)
109 stw r4,SL_DBAT3+4(r1)
113 stw r4,SL_IBAT0+4(r1)
117 stw r4,SL_IBAT1+4(r1)
121 stw r4,SL_IBAT2+4(r1)
125 stw r4,SL_IBAT3+4(r1)
127 /* Backup various CPU config stuffs */
130 /* The ROM can wake us up via 2 different vectors:
131 * - On wallstreet & lombard, we must write a magic
132 * value 'Lars' at address 4 and a pointer to a
133 * memory location containing the PC to resume from
135 * - On Core99, we must store the wakeup vector at
136 * address 0x80 and eventually it's parameters
137 * at address 0x84. I've have some trouble with those
138 * parameters however and I no longer use them.
140 lis r5,grackle_wake_up@ha
141 addi r5,r5,grackle_wake_up@l
151 /* Setup stuffs at 0x80-0x84 for Core99 */
152 lis r3,core99_wake_up@ha
153 addi r3,r3,core99_wake_up@l
157 /* Store a pointer to our backup storage into
160 lis r3,sleep_storage@ha
161 addi r3,r3,sleep_storage@l
164 /* Flush & disable all caches */
165 bl flush_disable_caches
167 /* Turn off data relocation. */
168 mfmsr r3 /* Save MSR in r7 */
169 rlwinm r3,r3,0,28,26 /* Turn off DR bit */
175 /* Flush any pending L2 data prefetches to work around HW bug */
178 lwz r0,0(r3) /* perform cache-inhibited load to ROM */
179 sync /* (caches are disabled at this point) */
180 END_FTR_SECTION_IFSET(CPU_FTR_SPEC7450)
183 * Set the HID0 and MSR for sleep.
186 rlwinm r2,r2,0,10,7 /* clear doze, nap */
187 oris r2,r2,HID0_SLEEP@h
193 /* This loop puts us back to sleep in case we have a spurrious
194 * wakeup so that the host bridge properly stays asleep. The
195 * CPU will be turned off, either after a known time (about 1
196 * second) on wallstreet & lombard, or as soon as the CPU enters
197 * SLEEP mode on core99
207 * Here is the resume code.
212 * Core99 machines resume here
213 * r4 has the physical address of SL_PC(sp) (unused)
215 _GLOBAL(core99_wake_up)
216 /* Make sure HID0 no longer contains any sleep bit and that data cache
220 rlwinm r3,r3,0,11,7 /* clear SLEEP, NAP, DOZE bits */
221 rlwinm 3,r3,0,18,15 /* clear DCE, ICE */
228 ori r3,r3,MSR_EE|MSR_IP
229 xori r3,r3,MSR_EE|MSR_IP
236 /* Recover sleep storage */
237 lis r3,sleep_storage@ha
238 addi r3,r3,sleep_storage@l
242 /* Pass thru to older resume code ... */
244 * Here is the resume code for older machines.
245 * r1 has the physical address of SL_PC(sp).
250 /* Restore the kernel's segment registers before
251 * we do any r1 memory access as we are not sure they
252 * are in a sane state above the first 256Mb region
254 li r0,16 /* load up segment register values */
255 mtctr r0 /* for context 0 */
256 lis r3,0x2000 /* Ku = 1, VSID = 0 */
259 addi r3,r3,0x111 /* increment VSID */
260 addis r4,r4,0x1000 /* address of next segment */
267 /* Restore various CPU config stuffs */
268 bl __restore_cpu_setup
270 /* Make sure all FPRs have been initialized */
272 bl __init_fpu_registers
274 /* Invalidate & enable L1 cache, we don't care about
275 * whatever the ROM may have tried to write to memory
279 /* Restore the BATs, and SDR1. Then we can turn on the MMU. */
284 lwz r4,SL_SPRG0+4(r1)
286 lwz r4,SL_SPRG0+8(r1)
288 lwz r4,SL_SPRG0+12(r1)
293 lwz r4,SL_DBAT0+4(r1)
297 lwz r4,SL_DBAT1+4(r1)
301 lwz r4,SL_DBAT2+4(r1)
305 lwz r4,SL_DBAT3+4(r1)
309 lwz r4,SL_IBAT0+4(r1)
313 lwz r4,SL_IBAT1+4(r1)
317 lwz r4,SL_IBAT2+4(r1)
321 lwz r4,SL_IBAT3+4(r1)
342 END_FTR_SECTION_IFSET(CPU_FTR_HAS_HIGH_BATS)
346 1: addic. r4,r4,-0x1000
351 /* restore the MSR and turn on the MMU */
355 /* get back the stack pointer */
366 /* Restore the callee-saved registers and return */
385 #endif /* defined(CONFIG_PM) || defined(CONFIG_CPU_FREQ) */
388 .balign L1_CACHE_LINE_SIZE
391 .balign L1_CACHE_LINE_SIZE, 0
393 #endif /* CONFIG_6xx */