d965263d2a
Add support for the PXA25X SoC family, the oldest of the PXA serie. Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
89 lines
2.2 KiB
ArmAsm
89 lines
2.2 KiB
ArmAsm
/*
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* Low-level PXA250/210 sleep/wakeUp support
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*
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* Initial SA1110 code:
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* Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
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*
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* Adapted for PXA by Nicolas Pitre:
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* Copyright (c) 2002 Monta Vista Software, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License.
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <mach/hardware.h>
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#include <mach/pxa2xx-regs.h>
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#define MDREFR_KDIV 0x200a4000 // all banks
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#define CCCR_SLEEP 0x00000107 // L=7 2N=2 A=0 PPDIS=0 CPDIS=0
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#define UNCACHED_PHYS_0 0
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.text
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#if (defined CONFIG_ARCH_PXA27X || defined CONFIG_ARCH_PXA25X)
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/*
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* pxa27x_finish_suspend()
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*
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* Forces CPU into sleep state.
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*
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* r0 = value for PWRMODE M field for desired sleep state
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*/
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ENTRY(pxa_suspend)
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@ Put the processor to sleep
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@ (also workaround for sighting 28071)
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@ prepare value for sleep mode
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mov r1, r0 @ sleep mode
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@ Intel PXA270 Specification Update notes problems sleeping
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@ with core operating above 91 MHz
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@ (see Errata 50, ...processor does not exit from sleep...)
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ldr r6, =CCCR
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ldr r8, [r6] @ keep original value for resume
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ldr r7, =CCCR_SLEEP @ prepare CCCR sleep value
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mov r0, #0x2 @ prepare value for CLKCFG
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@ align execution to a cache line
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b pxa_cpu_do_suspend
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#endif
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.ltorg
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.align 5
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pxa_cpu_do_suspend:
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@ All needed values are now in registers.
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@ These last instructions should be in cache
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@ initiate the frequency change...
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str r7, [r6]
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mcr p14, 0, r0, c6, c0, 0
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@ restore the original cpu speed value for resume
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str r8, [r6]
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@ need 6 13-MHz cycles before changing PWRMODE
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@ just set frequency to 91-MHz... 6*91/13 = 42
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mov r0, #42
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10: subs r0, r0, #1
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bne 10b
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@ Do not reorder...
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@ Intel PXA270 Specification Update notes problems performing
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@ external accesses after SDRAM is put in self-refresh mode
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@ (see Errata 39 ...hangs when entering self-refresh mode)
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@ enter sleep mode
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mcr p14, 0, r1, c7, c0, 0 @ PWRMODE
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20: b 20b @ loop waiting for sleep
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/*
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* pxa3xx_finish_suspend() - forces CPU into sleep state
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*/
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ENTRY(pxa3xx_suspend)
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mcr p14, 0, r0, c7, c0, 0 @ enter sleep
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20: b 20b @ waiting for sleep
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