77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
/*
|
|
* OMAP2xxx osc_clk-specific clock code
|
|
*
|
|
* Copyright (C) 2005-2008 Texas Instruments, Inc.
|
|
* Copyright (C) 2004-2010 Nokia Corporation
|
|
*
|
|
* Contacts:
|
|
* Richard Woodruff <r-woodruff2@ti.com>
|
|
* Paul Walmsley
|
|
*
|
|
* Based on earlier work by Tuukka Tikkanen, Tony Lindgren,
|
|
* Gordon McNutt and RidgeRun, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#undef DEBUG
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <plat/clock.h>
|
|
|
|
#include "clock.h"
|
|
#include "clock2xxx.h"
|
|
#include "prm2xxx_3xxx.h"
|
|
#include "prm-regbits-24xx.h"
|
|
|
|
/*
|
|
* XXX This does not actually enable the osc_ck, since the osc_ck must
|
|
* be running for this function to be called. Instead, this function
|
|
* is used to disable an autoidle mode on the osc_ck. The existing
|
|
* clk_enable/clk_disable()-based usecounting for osc_ck should be
|
|
* replaced with autoidle-based usecounting.
|
|
*/
|
|
static int omap2_enable_osc_ck(struct clk *clk)
|
|
{
|
|
u32 pcc;
|
|
|
|
pcc = __raw_readl(prcm_clksrc_ctrl);
|
|
|
|
__raw_writel(pcc & ~OMAP_AUTOEXTCLKMODE_MASK, prcm_clksrc_ctrl);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* XXX This does not actually disable the osc_ck, since doing so would
|
|
* immediately halt the system. Instead, this function is used to
|
|
* enable an autoidle mode on the osc_ck. The existing
|
|
* clk_enable/clk_disable()-based usecounting for osc_ck should be
|
|
* replaced with autoidle-based usecounting.
|
|
*/
|
|
static void omap2_disable_osc_ck(struct clk *clk)
|
|
{
|
|
u32 pcc;
|
|
|
|
pcc = __raw_readl(prcm_clksrc_ctrl);
|
|
|
|
__raw_writel(pcc | OMAP_AUTOEXTCLKMODE_MASK, prcm_clksrc_ctrl);
|
|
}
|
|
|
|
const struct clkops clkops_oscck = {
|
|
.enable = omap2_enable_osc_ck,
|
|
.disable = omap2_disable_osc_ck,
|
|
};
|
|
|
|
unsigned long omap2_osc_clk_recalc(struct clk *clk)
|
|
{
|
|
return omap2xxx_get_apll_clkin() * omap2xxx_get_sysclkdiv();
|
|
}
|
|
|