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be0524d38f
This is i.MX BSP 5.0.0 release ported to 2.6.31 Signed-off-by: Rob Herring <r.herring@freescale.com> Signed-off-by: Alan Tull <r80115@freescale.com> Signed-off-by: Xinyu Chen <xinyu.chen@freescale.com>
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/*
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* Copyright (C) 1999 ARM Limited
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* Copyright (C) 2000 Deep Blue Solutions Ltd
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* Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved.
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <mach/hardware.h>
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#include <asm/proc-fns.h>
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#include <asm/system.h>
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#include <mach/clock.h>
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#include "crm_regs.h"
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/*!
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* @defgroup MSL_MX31 i.MX31 Machine Specific Layer (MSL)
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*/
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/*!
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* @file mach-mx3/system.c
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* @brief This file contains idle and reset functions.
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*
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* @ingroup MSL_MX31
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*/
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static int clks_initialized = 0;
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static struct clk *sdma_clk, *mbx_clk, *ipu_clk, *mpeg_clk, *vpu_clk, *usb_clk,
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*rtic_clk, *nfc_clk, *emi_clk;
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extern int mxc_jtag_enabled;
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/*!
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* This function puts the CPU into idle mode. It is called by default_idle()
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* in process.c file.
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*/
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void arch_idle(void)
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{
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int emi_gated_off = 0;
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/*
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* This should do all the clock switching
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* and wait for interrupt tricks.
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*/
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if (!mxc_jtag_enabled) {
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if (clks_initialized == 0) {
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clks_initialized = 1;
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sdma_clk = clk_get(NULL, "sdma_ahb_clk");
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ipu_clk = clk_get(NULL, "ipu_clk");
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if (cpu_is_mx31()) {
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mpeg_clk = clk_get(NULL, "mpeg4_clk");
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mbx_clk = clk_get(NULL, "mbx_clk");
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} else {
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vpu_clk = clk_get(NULL, "vpu_clk");
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}
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usb_clk = clk_get(NULL, "usb_ahb_clk");
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rtic_clk = clk_get(NULL, "rtic_clk");
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nfc_clk = clk_get(NULL, "nfc_clk");
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emi_clk = clk_get(NULL, "emi_clk");
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}
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if ((clk_get_usecount(sdma_clk) == 0)
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&& (clk_get_usecount(ipu_clk) <= 1)
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&& (clk_get_usecount(usb_clk) == 0)
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&& (clk_get_usecount(rtic_clk) == 0)
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&& (clk_get_usecount(mpeg_clk) == 0)
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&& (clk_get_usecount(mbx_clk) == 0)
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&& (clk_get_usecount(nfc_clk) == 0)
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&& (clk_get_usecount(vpu_clk) == 0)) {
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emi_gated_off = 1;
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clk_disable(emi_clk);
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}
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cpu_do_idle();
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if (emi_gated_off == 1) {
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clk_enable(emi_clk);
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}
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}
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}
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/*
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* This function resets the system. It is called by machine_restart().
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*
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* @param mode indicates different kinds of resets
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*/
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void arch_reset(char mode)
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{
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/* Assert SRS signal */
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mxc_wd_reset();
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}
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