cc1d230cfb
Place some comments in the OMAP oscillator clock control code to note that its autoidle mode should eventually be controlled via the new OMAP clockfw autoidle control interface. Signed-off-by: Paul Walmsley <paul@pwsan.com> Tested-by: Rajendra Nayak <rnayak@ti.com> Reviewed-by: Kevin Hilman <khilman@ti.com>
76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
/*
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* OMAP2xxx osc_clk-specific clock code
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*
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* Copyright (C) 2005-2008 Texas Instruments, Inc.
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* Copyright (C) 2004-2010 Nokia Corporation
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*
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* Contacts:
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* Richard Woodruff <r-woodruff2@ti.com>
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* Paul Walmsley
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*
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* Based on earlier work by Tuukka Tikkanen, Tony Lindgren,
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* Gordon McNutt and RidgeRun, Inc.
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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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#undef DEBUG
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <plat/clock.h>
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#include "clock.h"
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#include "clock2xxx.h"
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#include "prm2xxx_3xxx.h"
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#include "prm-regbits-24xx.h"
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/*
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* XXX This does not actually enable the osc_ck, since the osc_ck must
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* be running for this function to be called. Instead, this function
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* is used to disable an autoidle mode on the osc_ck. The existing
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* clk_enable/clk_disable()-based usecounting for osc_ck should be
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* replaced with autoidle-based usecounting.
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*/
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static int omap2_enable_osc_ck(struct clk *clk)
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{
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u32 pcc;
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pcc = __raw_readl(prcm_clksrc_ctrl);
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__raw_writel(pcc & ~OMAP_AUTOEXTCLKMODE_MASK, prcm_clksrc_ctrl);
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return 0;
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}
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/*
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* XXX This does not actually disable the osc_ck, since doing so would
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* immediately halt the system. Instead, this function is used to
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* enable an autoidle mode on the osc_ck. The existing
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* clk_enable/clk_disable()-based usecounting for osc_ck should be
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* replaced with autoidle-based usecounting.
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*/
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static void omap2_disable_osc_ck(struct clk *clk)
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{
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u32 pcc;
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pcc = __raw_readl(prcm_clksrc_ctrl);
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__raw_writel(pcc | OMAP_AUTOEXTCLKMODE_MASK, prcm_clksrc_ctrl);
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}
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const struct clkops clkops_oscck = {
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.enable = omap2_enable_osc_ck,
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.disable = omap2_disable_osc_ck,
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};
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unsigned long omap2_osc_clk_recalc(struct clk *clk)
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{
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return omap2xxx_get_apll_clkin() * omap2xxx_get_sysclkdiv();
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}
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