mirror of https://gitee.com/openkylin/linux.git
71 lines
1.6 KiB
C
71 lines
1.6 KiB
C
/*
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* OMAP2/3 CM module functions
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*
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* Copyright (C) 2009 Nokia Corporation
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* Paul Walmsley
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <asm/atomic.h>
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#include "cm.h"
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#include "cm-regbits-24xx.h"
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#include "cm-regbits-34xx.h"
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/* MAX_MODULE_READY_TIME: max milliseconds for module to leave idle */
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#define MAX_MODULE_READY_TIME 20000
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static const u8 cm_idlest_offs[] = {
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CM_IDLEST1, CM_IDLEST2, OMAP2430_CM_IDLEST3
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};
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/**
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* omap2_cm_wait_idlest_ready - wait for a module to leave idle or standby
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* @prcm_mod: PRCM module offset
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* @idlest_id: CM_IDLESTx register ID (i.e., x = 1, 2, 3)
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* @idlest_shift: shift of the bit in the CM_IDLEST* register to check
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*
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* XXX document
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*/
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int omap2_cm_wait_module_ready(s16 prcm_mod, u8 idlest_id, u8 idlest_shift)
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{
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int ena = 0, i = 0;
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u8 cm_idlest_reg;
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u32 mask;
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if (!idlest_id || (idlest_id > ARRAY_SIZE(cm_idlest_offs)))
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return -EINVAL;
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cm_idlest_reg = cm_idlest_offs[idlest_id - 1];
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if (cpu_is_omap24xx())
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ena = idlest_shift;
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else if (cpu_is_omap34xx())
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ena = 0;
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else
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BUG();
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mask = 1 << idlest_shift;
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/* XXX should be OMAP2 CM */
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while (((cm_read_mod_reg(prcm_mod, cm_idlest_reg) & mask) != ena) &&
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(i++ < MAX_MODULE_READY_TIME))
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udelay(1);
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return (i < MAX_MODULE_READY_TIME) ? 0 : -EBUSY;
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}
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