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path: root/firmware/target/arm/imx233/dma-imx233.c
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/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2011 by amaury Pouly
 *
 * Based on Rockbox iriver bootloader by Linus Nielsen Feltzing
 * and the ipodlinux bootloader by Daniel Palffy and Bernard Leach
 * 
 * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#include "config.h"
#include "system.h"
#include "dma-imx233.h"

void imx233_dma_init(void)
{
    /* Enable APHB and APBX */
    __REG_CLR(HW_APBH_CTRL0) = __BLOCK_CLKGATE | __BLOCK_SFTRST;
    __REG_CLR(HW_APBX_CTRL0) = __BLOCK_CLKGATE | __BLOCK_SFTRST;
}

void imx233_dma_reset_channel(unsigned chan)
{
    if(APB_IS_APBX_CHANNEL(chan))
        __REG_SET(HW_APBX_CHANNEL_CTRL) =
            HW_APBX_CHANNEL_CTRL__RESET_CHANNEL(APB_GET_DMA_CHANNEL(chan));
    else
        __REG_SET(HW_APBH_CTRL0) =
            HW_APBH_CTRL0__RESET_CHANNEL(APB_GET_DMA_CHANNEL(chan));
}

void imx233_dma_clkgate_channel(unsigned chan, bool enable_clock)
{
    if(APB_IS_APBX_CHANNEL(chan))
        return;
    if(enable_clock)
        __REG_CLR(HW_APBH_CTRL0) =
            HW_APBH_CTRL0__CLKGATE_CHANNEL(APB_GET_DMA_CHANNEL(chan));
    else
        __REG_SET(HW_APBH_CTRL0) =
            HW_APBH_CTRL0__CLKGATE_CHANNEL(APB_GET_DMA_CHANNEL(chan));
}

void imx233_dma_enable_channel_interrupt(unsigned chan, bool enable)
{
    volatile uint32_t *ptr;
    uint32_t bm;
    if(APB_IS_APBX_CHANNEL(chan))
    {
        ptr = &HW_APBX_CTRL1;
        bm = HW_APBX_CTRL1__CHx_CMDCMPLT_IRQ_EN(APB_GET_DMA_CHANNEL(chan));
    }
    else
    {
        ptr = &HW_APBH_CTRL1;;
        bm = HW_APBH_CTRL1__CHx_CMDCMPLT_IRQ_EN(APB_GET_DMA_CHANNEL(chan));
    }

    if(enable)
    {
        __REG_SET(*ptr) = bm;
        imx233_dma_clear_channel_interrupt(chan);
    }
    else
        __REG_CLR(*ptr) = bm;
}

void imx233_dma_clear_channel_interrupt(unsigned chan)
{
    if(APB_IS_APBX_CHANNEL(chan))
    {
        __REG_CLR(HW_APBX_CTRL1) =
            HW_APBX_CTRL1__CHx_CMDCMPLT_IRQ(APB_GET_DMA_CHANNEL(chan));
        __REG_CLR(HW_APBX_CTRL2) =
            HW_APBX_CTRL2__CHx_ERROR_IRQ(APB_GET_DMA_CHANNEL(chan));
    }
    else
    {
        __REG_CLR(HW_APBH_CTRL1) =
            HW_APBH_CTRL1__CHx_CMDCMPLT_IRQ(APB_GET_DMA_CHANNEL(chan));
        __REG_CLR(HW_APBH_CTRL2) =
            HW_APBH_CTRL2__CHx_ERROR_IRQ(APB_GET_DMA_CHANNEL(chan));
    }
}

bool imx233_dma_is_channel_error_irq(unsigned chan)
{
    if(APB_IS_APBX_CHANNEL(chan))
        return !!(HW_APBX_CTRL2 &
            HW_APBX_CTRL2__CHx_ERROR_IRQ(APB_GET_DMA_CHANNEL(chan)));
    else
        return !!(HW_APBH_CTRL2 &
            HW_APBH_CTRL2__CHx_ERROR_IRQ(APB_GET_DMA_CHANNEL(chan)));
}

void imx233_dma_start_command(unsigned chan, struct apb_dma_command_t *cmd)
{
    if(APB_IS_APBX_CHANNEL(chan))
    {
        HW_APBX_CHx_NXTCMDAR(APB_GET_DMA_CHANNEL(chan)) = (uint32_t)cmd;
        HW_APBX_CHx_SEMA(APB_GET_DMA_CHANNEL(chan)) = 1;
    }
    else
    {
        HW_APBH_CHx_NXTCMDAR(APB_GET_DMA_CHANNEL(chan)) = (uint32_t)cmd;
        HW_APBH_CHx_SEMA(APB_GET_DMA_CHANNEL(chan)) = 1;
    }
}

void imx233_dma_wait_completion(unsigned chan)
{
    volatile uint32_t *sema;
    if(APB_IS_APBX_CHANNEL(chan))
        sema = &HW_APBX_CHx_SEMA(APB_GET_DMA_CHANNEL(chan));
    else
        sema = &HW_APBH_CHx_SEMA(APB_GET_DMA_CHANNEL(chan));

    while(*sema & HW_APB_CHx_SEMA__PHORE_BM)
        ;
}