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/*
* Copyright (C) 1999 ARM Limited
* Copyright (C) 2000 Deep Blue Solutions Ltd
* Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/clk.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <asm/proc-fns.h>
#include <asm/system.h>
#include <mach/clock.h>
#include "crm_regs.h"
/*!
* @defgroup MSL_MX31 i.MX31 Machine Specific Layer (MSL)
*/
/*!
* @file mach-mx3/system.c
* @brief This file contains idle and reset functions.
*
* @ingroup MSL_MX31
*/
static int clks_initialized = 0;
static struct clk *sdma_clk, *mbx_clk, *ipu_clk, *mpeg_clk, *vpu_clk, *usb_clk,
*rtic_clk, *nfc_clk, *emi_clk;
extern int mxc_jtag_enabled;
/*!
* This function puts the CPU into idle mode. It is called by default_idle()
* in process.c file.
*/
void arch_idle(void)
{
int emi_gated_off = 0;
/*
* This should do all the clock switching
* and wait for interrupt tricks.
*/
if (!mxc_jtag_enabled) {
if (clks_initialized == 0) {
clks_initialized = 1;
sdma_clk = clk_get(NULL, "sdma_ahb_clk");
ipu_clk = clk_get(NULL, "ipu_clk");
if (cpu_is_mx31()) {
mpeg_clk = clk_get(NULL, "mpeg4_clk");
mbx_clk = clk_get(NULL, "mbx_clk");
} else {
vpu_clk = clk_get(NULL, "vpu_clk");
}
usb_clk = clk_get(NULL, "usb_ahb_clk");
rtic_clk = clk_get(NULL, "rtic_clk");
nfc_clk = clk_get(NULL, "nfc_clk");
emi_clk = clk_get(NULL, "emi_clk");
}
if ((clk_get_usecount(sdma_clk) == 0)
&& (clk_get_usecount(ipu_clk) <= 1)
&& (clk_get_usecount(usb_clk) == 0)
&& (clk_get_usecount(rtic_clk) == 0)
&& (clk_get_usecount(mpeg_clk) == 0)
&& (clk_get_usecount(mbx_clk) == 0)
&& (clk_get_usecount(nfc_clk) == 0)
&& (clk_get_usecount(vpu_clk) == 0)) {
emi_gated_off = 1;
clk_disable(emi_clk);
}
cpu_do_idle();
if (emi_gated_off == 1) {
clk_enable(emi_clk);
}
}
}
/*
* This function resets the system. It is called by machine_restart().
*
* @param mode indicates different kinds of resets
*/
void arch_reset(char mode)
{
/* Assert SRS signal */
mxc_wd_reset();
}
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