flowctrl.c

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/*
 * arch/arm/mach-tegra/flowctrl.c
 *
 * functions and macros to control the flowcontroller
 *
 * Copyright (c) 2010-2012, NVIDIA Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/io.h>

#include <mach/iomap.h>

#include "flowctrl.h"

u8 flowctrl_offset_halt_cpu[] = {
    FLOW_CTRL_HALT_CPU0_EVENTS,
    FLOW_CTRL_HALT_CPU1_EVENTS,
    FLOW_CTRL_HALT_CPU1_EVENTS + 8,
    FLOW_CTRL_HALT_CPU1_EVENTS + 16,
};

u8 flowctrl_offset_cpu_csr[] = {
    FLOW_CTRL_CPU0_CSR,
    FLOW_CTRL_CPU1_CSR,
    FLOW_CTRL_CPU1_CSR + 8,
    FLOW_CTRL_CPU1_CSR + 16,
};

static void flowctrl_update(u8 offset, u32 value)
{
    void __iomem *addr = IO_ADDRESS(TEGRA_FLOW_CTRL_BASE) + offset;

    writel(value, addr);

    /* ensure the update has reached the flow controller */
    wmb();
    readl_relaxed(addr);
}

void flowctrl_write_cpu_csr(unsigned int cpuid, u32 value)
{
    return flowctrl_update(flowctrl_offset_cpu_csr[cpuid], value);
}

void flowctrl_write_cpu_halt(unsigned int cpuid, u32 value)
{
    return flowctrl_update(flowctrl_offset_halt_cpu[cpuid], value);
}