2 * linux/arch/arm/mach-omap1/sleep.S
4 * Low-level OMAP730/1510/1610 sleep/wakeUp support
7 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
9 * Adapted for PXA by Nicolas Pitre:
10 * Copyright (c) 2002 Monta Vista Software, Inc.
12 * Support for OMAP1510/1610 by Dirk Behme <dirk.behme@de.bosch.com>
14 * This program is free software; you can redistribute it and/or modify it
15 * under the terms of the GNU General Public License as published by the
16 * Free Software Foundation; either version 2 of the License, or (at your
17 * option) any later version.
19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
20 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
22 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
25 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
26 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 * You should have received a copy of the GNU General Public License along
31 * with this program; if not, write to the Free Software Foundation, Inc.,
32 * 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/config.h>
36 #include <linux/linkage.h>
37 #include <asm/assembler.h>
38 #include <asm/arch/io.h>
39 #include <asm/arch/pm.h>
44 * Forces OMAP into idle state
46 * omapXXXX_idle_loop_suspend()
48 * Note: This code get's copied to internal SRAM at boot. When the OMAP
49 * wakes up it continues execution at the point it went to sleep.
51 * Note: Because of slightly different configuration values we have
52 * processor specific functions here.
55 #if defined(CONFIG_ARCH_OMAP730)
56 ENTRY(omap730_idle_loop_suspend)
58 stmfd sp!, {r0 - r12, lr} @ save registers on stack
60 @ load base address of ARM_IDLECT1 and ARM_IDLECT2
61 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
62 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
63 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
65 @ turn off clock domains
66 @ get ARM_IDLECT2 into r2
67 ldrh r2, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
68 mov r5, #OMAP730_IDLECT2_SLEEP_VAL & 0xff
69 orr r5, r5, #OMAP730_IDLECT2_SLEEP_VAL & 0xff00
70 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
73 @ get ARM_IDLECT1 into r1
74 ldrh r1, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
75 orr r3, r1, #OMAP730_IDLE_LOOP_REQUEST & 0xffff
76 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
78 mov r5, #IDLE_WAIT_CYCLES & 0xff
79 orr r5, r5, #IDLE_WAIT_CYCLES & 0xff00
80 l_730: subs r5, r5, #1
83 * Let's wait for the next clock tick to wake us up.
86 mcr p15, 0, r0, c7, c0, 4 @ wait for interrupt
88 * omap730_idle_loop_suspend()'s resume point.
90 * It will just start executing here, so we'll restore stuff from the
91 * stack, reset the ARM_IDLECT1 and ARM_IDLECT2.
94 @ restore ARM_IDLECT1 and ARM_IDLECT2 and return
95 @ r1 has ARM_IDLECT1 and r2 still has ARM_IDLECT2
96 strh r2, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
97 strh r1, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
99 ldmfd sp!, {r0 - r12, pc} @ restore regs and return
101 ENTRY(omap730_idle_loop_suspend_sz)
102 .word . - omap730_idle_loop_suspend
103 #endif /* CONFIG_ARCH_OMAP730 */
105 #ifdef CONFIG_ARCH_OMAP15XX
106 ENTRY(omap1510_idle_loop_suspend)
108 stmfd sp!, {r0 - r12, lr} @ save registers on stack
110 @ load base address of ARM_IDLECT1 and ARM_IDLECT2
111 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
112 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
113 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
115 @ turn off clock domains
116 @ get ARM_IDLECT2 into r2
117 ldrh r2, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
118 mov r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff
119 orr r5, r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff00
120 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
123 @ get ARM_IDLECT1 into r1
124 ldrh r1, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
125 orr r3, r1, #OMAP1510_IDLE_LOOP_REQUEST & 0xffff
126 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
128 mov r5, #IDLE_WAIT_CYCLES & 0xff
129 orr r5, r5, #IDLE_WAIT_CYCLES & 0xff00
130 l_1510: subs r5, r5, #1
133 * Let's wait for the next clock tick to wake us up.
136 mcr p15, 0, r0, c7, c0, 4 @ wait for interrupt
138 * omap1510_idle_loop_suspend()'s resume point.
140 * It will just start executing here, so we'll restore stuff from the
141 * stack, reset the ARM_IDLECT1 and ARM_IDLECT2.
144 @ restore ARM_IDLECT1 and ARM_IDLECT2 and return
145 @ r1 has ARM_IDLECT1 and r2 still has ARM_IDLECT2
146 strh r2, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
147 strh r1, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
149 ldmfd sp!, {r0 - r12, pc} @ restore regs and return
151 ENTRY(omap1510_idle_loop_suspend_sz)
152 .word . - omap1510_idle_loop_suspend
153 #endif /* CONFIG_ARCH_OMAP15XX */
155 #if defined(CONFIG_ARCH_OMAP16XX)
156 ENTRY(omap1610_idle_loop_suspend)
158 stmfd sp!, {r0 - r12, lr} @ save registers on stack
160 @ load base address of ARM_IDLECT1 and ARM_IDLECT2
161 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
162 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
163 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
165 @ turn off clock domains
166 @ get ARM_IDLECT2 into r2
167 ldrh r2, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
168 mov r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff
169 orr r5, r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff00
170 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
173 @ get ARM_IDLECT1 into r1
174 ldrh r1, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
175 orr r3, r1, #OMAP1610_IDLE_LOOP_REQUEST & 0xffff
176 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
178 mov r5, #IDLE_WAIT_CYCLES & 0xff
179 orr r5, r5, #IDLE_WAIT_CYCLES & 0xff00
180 l_1610: subs r5, r5, #1
183 * Let's wait for the next clock tick to wake us up.
186 mcr p15, 0, r0, c7, c0, 4 @ wait for interrupt
188 * omap1610_idle_loop_suspend()'s resume point.
190 * It will just start executing here, so we'll restore stuff from the
191 * stack, reset the ARM_IDLECT1 and ARM_IDLECT2.
194 @ restore ARM_IDLECT1 and ARM_IDLECT2 and return
195 @ r1 has ARM_IDLECT1 and r2 still has ARM_IDLECT2
196 strh r2, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
197 strh r1, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
199 ldmfd sp!, {r0 - r12, pc} @ restore regs and return
201 ENTRY(omap1610_idle_loop_suspend_sz)
202 .word . - omap1610_idle_loop_suspend
203 #endif /* CONFIG_ARCH_OMAP16XX */
206 * Forces OMAP into deep sleep state
208 * omapXXXX_cpu_suspend()
210 * The values of the registers ARM_IDLECT1 and ARM_IDLECT2 are passed
211 * as arg0 and arg1 from caller. arg0 is stored in register r0 and arg1
214 * Note: This code get's copied to internal SRAM at boot. When the OMAP
215 * wakes up it continues execution at the point it went to sleep.
217 * Note: Because of errata work arounds we have processor specific functions
218 * here. They are mostly the same, but slightly different.
222 #if defined(CONFIG_ARCH_OMAP730)
223 ENTRY(omap730_cpu_suspend)
225 @ save registers on stack
226 stmfd sp!, {r0 - r12, lr}
230 mcr p15, 0, r0, c7, c10, 4
233 @ load base address of Traffic Controller
234 mov r6, #TCMIF_ASM_BASE & 0xff000000
235 orr r6, r6, #TCMIF_ASM_BASE & 0x00ff0000
236 orr r6, r6, #TCMIF_ASM_BASE & 0x0000ff00
238 @ prepare to put SDRAM into self-refresh manually
239 ldr r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
240 orr r9, r7, #SELF_REFRESH_MODE & 0xff000000
241 orr r9, r9, #SELF_REFRESH_MODE & 0x000000ff
242 str r9, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
244 @ prepare to put EMIFS to Sleep
245 ldr r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
246 orr r9, r8, #IDLE_EMIFS_REQUEST & 0xff
247 str r9, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
249 @ load base address of ARM_IDLECT1 and ARM_IDLECT2
250 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
251 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
252 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
254 @ turn off clock domains
255 @ do not disable PERCK (0x04)
256 mov r5, #OMAP730_IDLECT2_SLEEP_VAL & 0xff
257 orr r5, r5, #OMAP730_IDLECT2_SLEEP_VAL & 0xff00
258 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
261 mov r3, #OMAP730_IDLECT1_SLEEP_VAL & 0xff
262 orr r3, r3, #OMAP730_IDLECT1_SLEEP_VAL & 0xff00
263 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
265 @ disable instruction cache
266 mrc p15, 0, r9, c1, c0, 0
268 mcr p15, 0, r2, c1, c0, 0
272 * Let's wait for the next wake up event to wake us up. r0 can't be
273 * used here because r0 holds ARM_IDLECT1
276 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
278 * omap730_cpu_suspend()'s resume point.
280 * It will just start executing here, so we'll restore stuff from the
284 mcr p15, 0, r9, c1, c0, 0
286 @ reset the ARM_IDLECT1 and ARM_IDLECT2.
287 strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
288 strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
290 @ Restore EMIFF controls
291 str r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
292 str r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
294 @ restore regs and return
295 ldmfd sp!, {r0 - r12, pc}
297 ENTRY(omap730_cpu_suspend_sz)
298 .word . - omap730_cpu_suspend
299 #endif /* CONFIG_ARCH_OMAP730 */
301 #ifdef CONFIG_ARCH_OMAP15XX
302 ENTRY(omap1510_cpu_suspend)
304 @ save registers on stack
305 stmfd sp!, {r0 - r12, lr}
307 @ load base address of Traffic Controller
308 mov r4, #TCMIF_ASM_BASE & 0xff000000
309 orr r4, r4, #TCMIF_ASM_BASE & 0x00ff0000
310 orr r4, r4, #TCMIF_ASM_BASE & 0x0000ff00
312 @ work around errata of OMAP1510 PDE bit for TC shut down
314 ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
315 bic r5, r5, #PDE_BIT & 0xff
316 str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
319 and r5, r5, #PWD_EN_BIT & 0xff
320 str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
322 @ prepare to put SDRAM into self-refresh manually
323 ldr r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
324 orr r5, r5, #SELF_REFRESH_MODE & 0xff000000
325 orr r5, r5, #SELF_REFRESH_MODE & 0x000000ff
326 str r5, [r4, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
328 @ prepare to put EMIFS to Sleep
329 ldr r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
330 orr r5, r5, #IDLE_EMIFS_REQUEST & 0xff
331 str r5, [r4, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
333 @ load base address of ARM_IDLECT1 and ARM_IDLECT2
334 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
335 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
336 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
338 @ turn off clock domains
339 mov r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff
340 orr r5, r5, #OMAP1510_IDLE_CLOCK_DOMAINS & 0xff00
341 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
344 mov r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff
345 orr r3, r3, #OMAP1510_DEEP_SLEEP_REQUEST & 0xff00
346 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
348 mov r5, #IDLE_WAIT_CYCLES & 0xff
349 orr r5, r5, #IDLE_WAIT_CYCLES & 0xff00
354 * Let's wait for the next wake up event to wake us up. r0 can't be
355 * used here because r0 holds ARM_IDLECT1
358 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
360 * omap1510_cpu_suspend()'s resume point.
362 * It will just start executing here, so we'll restore stuff from the
363 * stack, reset the ARM_IDLECT1 and ARM_IDLECT2.
365 strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
366 strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
368 @ restore regs and return
369 ldmfd sp!, {r0 - r12, pc}
371 ENTRY(omap1510_cpu_suspend_sz)
372 .word . - omap1510_cpu_suspend
373 #endif /* CONFIG_ARCH_OMAP15XX */
375 #if defined(CONFIG_ARCH_OMAP16XX)
376 ENTRY(omap1610_cpu_suspend)
378 @ save registers on stack
379 stmfd sp!, {r0 - r12, lr}
383 mcr p15, 0, r0, c7, c10, 4
386 @ Load base address of Traffic Controller
387 mov r6, #TCMIF_ASM_BASE & 0xff000000
388 orr r6, r6, #TCMIF_ASM_BASE & 0x00ff0000
389 orr r6, r6, #TCMIF_ASM_BASE & 0x0000ff00
391 @ Prepare to put SDRAM into self-refresh manually
392 ldr r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
393 orr r9, r7, #SELF_REFRESH_MODE & 0xff000000
394 orr r9, r9, #SELF_REFRESH_MODE & 0x000000ff
395 str r9, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
397 @ Prepare to put EMIFS to Sleep
398 ldr r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
399 orr r9, r8, #IDLE_EMIFS_REQUEST & 0xff
400 str r9, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
402 @ Load base address of ARM_IDLECT1 and ARM_IDLECT2
403 mov r4, #CLKGEN_REG_ASM_BASE & 0xff000000
404 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
405 orr r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
407 @ Turn off clock domains
408 @ Do not disable PERCK (0x04)
409 mov r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff
410 orr r5, r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff00
411 strh r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
414 mov r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff
415 orr r3, r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff00
416 strh r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
419 * Let's wait for the next wake up event to wake us up. r0 can't be
420 * used here because r0 holds ARM_IDLECT1
423 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
425 @ Errata (HEL3SU467, section 1.4.4) specifies nop-instructions
426 @ according to this formula:
427 @ 2 + (4*DPLL_MULT)/DPLL_DIV/ARMDIV
431 @ => 74 nop-instructions
507 * omap1610_cpu_suspend()'s resume point.
509 * It will just start executing here, so we'll restore stuff from the
512 @ Restore the ARM_IDLECT1 and ARM_IDLECT2.
513 strh r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
514 strh r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
516 @ Restore EMIFF controls
517 str r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
518 str r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
520 @ Restore regs and return
521 ldmfd sp!, {r0 - r12, pc}
523 ENTRY(omap1610_cpu_suspend_sz)
524 .word . - omap1610_cpu_suspend
525 #endif /* CONFIG_ARCH_OMAP16XX */