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Diffstat (limited to 'arch/arm/mach-mx3/system.c')
| -rw-r--r-- | arch/arm/mach-mx3/system.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/arch/arm/mach-mx3/system.c b/arch/arm/mach-mx3/system.c new file mode 100644 index 000000000000..a2f5442e7da5 --- /dev/null +++ b/arch/arm/mach-mx3/system.c @@ -0,0 +1,93 @@ +/* + * Copyright (C) 1999 ARM Limited + * Copyright (C) 2000 Deep Blue Solutions Ltd + * Copyright 2004-2010 Freescale Semiconductor, Inc. + * + * 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; +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); + + } +} + |