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/*
* Copyright (C) 2009-2010 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/dmapool.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <mach/device.h>
#include <mach/dmaengine.h>
#include "regs-apbx.h"
static int mxs_dma_apbx_enable(struct mxs_dma_chan *pchan, unsigned int chan)
{
unsigned int sem;
struct mxs_dma_device *pdev = pchan->dma;
struct mxs_dma_desc *pdesc;
pdesc = list_first_entry(&pchan->active, struct mxs_dma_desc, node);
if (pdesc == NULL)
return -EFAULT;
sem = __raw_readl(pdev->base + HW_APBX_CHn_SEMA(chan));
sem = (sem & BM_APBX_CHn_SEMA_PHORE) >> BP_APBX_CHn_SEMA_PHORE;
if (pchan->flags & MXS_DMA_FLAGS_BUSY) {
if (pdesc->cmd.cmd.bits.chain == 0)
return 0;
if (sem < 2) {
if (!sem)
return 0;
pdesc = list_entry(pdesc->node.next,
struct mxs_dma_desc, node);
__raw_writel(mxs_dma_cmd_address(pdesc),
pdev->base + HW_APBX_CHn_NXTCMDAR(chan));
}
sem = pchan->pending_num;
pchan->pending_num = 0;
__raw_writel(BF_APBX_CHn_SEMA_INCREMENT_SEMA(sem),
pdev->base + HW_APBX_CHn_SEMA(chan));
pchan->active_num += sem;
return 0;
}
pchan->active_num += pchan->pending_num;
pchan->pending_num = 0;
__raw_writel(mxs_dma_cmd_address(pdesc),
pdev->base + HW_APBX_CHn_NXTCMDAR(chan));
__raw_writel(pchan->active_num, pdev->base + HW_APBX_CHn_SEMA(chan));
return 0;
}
static void mxs_dma_apbx_disable(struct mxs_dma_chan *pchan, unsigned int chan)
{
struct mxs_dma_device *pdev = pchan->dma;
__raw_writel(0, pdev->base + HW_APBX_CHn_SEMA(chan));
}
static void mxs_dma_apbx_reset(struct mxs_dma_device *pdev, unsigned int chan)
{
__raw_writel(1 << (chan + BP_APBX_CHANNEL_CTRL_RESET_CHANNEL),
pdev->base + HW_APBX_CHANNEL_CTRL_SET);
}
static void mxs_dma_apbx_freeze(struct mxs_dma_device *pdev, unsigned int chan)
{
__raw_writel(1 << chan, pdev->base + HW_APBX_CHANNEL_CTRL_SET);
}
static void
mxs_dma_apbx_unfreeze(struct mxs_dma_device *pdev, unsigned int chan)
{
__raw_writel(1 << chan, pdev->base + HW_APBX_CHANNEL_CTRL_CLR);
}
static void mxs_dma_apbx_info(struct mxs_dma_device *pdev,
unsigned int chan, struct mxs_dma_info *info)
{
unsigned int reg;
reg = __raw_readl(pdev->base + HW_APBX_CTRL2);
info->status = reg >> chan;
info->buf_addr = __raw_readl(pdev->base + HW_APBX_CHn_BAR(chan));
}
static int
mxs_dma_apbx_read_semaphore(struct mxs_dma_device *pdev, unsigned int chan)
{
unsigned int reg;
reg = __raw_readl(pdev->base + HW_APBX_CHn_SEMA(chan));
return (reg & BM_APBX_CHn_SEMA_PHORE) >> BP_APBX_CHn_SEMA_PHORE;
}
static void
mxs_dma_apbx_enable_irq(struct mxs_dma_device *pdev,
unsigned int chan, int enable)
{
if (enable) {
__raw_writel(1 << (chan + 16), pdev->base + HW_APBX_CTRL1_SET);
} else {
__raw_writel(1 << (chan + 16), pdev->base + HW_APBX_CTRL1_CLR);
}
}
static int
mxs_dma_apbx_irq_is_pending(struct mxs_dma_device *pdev, unsigned int chan)
{
unsigned int reg;
reg = __raw_readl(pdev->base + HW_APBX_CTRL1);
reg |= __raw_readl(pdev->base + HW_APBX_CTRL2);
return reg & (1 << chan);
}
static void mxs_dma_apbx_ack_irq(struct mxs_dma_device *pdev, unsigned int chan)
{
__raw_writel(1 << chan, pdev->base + HW_APBX_CTRL1_CLR);
__raw_writel(1 << chan, pdev->base + HW_APBX_CTRL2_CLR);
}
static struct mxs_dma_device mxs_dma_apbx = {
.name = "mxs-dma-apbx",
.enable = mxs_dma_apbx_enable,
.disable = mxs_dma_apbx_disable,
.reset = mxs_dma_apbx_reset,
.freeze = mxs_dma_apbx_freeze,
.unfreeze = mxs_dma_apbx_unfreeze,
.info = mxs_dma_apbx_info,
.read_semaphore = mxs_dma_apbx_read_semaphore,
.enable_irq = mxs_dma_apbx_enable_irq,
.irq_is_pending = mxs_dma_apbx_irq_is_pending,
.ack_irq = mxs_dma_apbx_ack_irq,
};
static int __devinit dma_apbx_probe(struct platform_device *pdev)
{
int i;
struct resource *res;
struct mxs_dma_plat_data *plat;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENOMEM;
mxs_dma_apbx.base = IO_ADDRESS(res->start);
__raw_writel(BM_APBX_CTRL0_SFTRST,
mxs_dma_apbx.base + HW_APBX_CTRL0_CLR);
for (i = 0; i < 10000; i++) {
if (!(__raw_readl(mxs_dma_apbx.base + HW_APBX_CTRL0_CLR) &
BM_APBX_CTRL0_SFTRST))
break;
udelay(2);
}
if (i >= 10000)
return -ETIME;
__raw_writel(BM_APBX_CTRL0_CLKGATE,
mxs_dma_apbx.base + HW_APBX_CTRL0_CLR);
plat = (struct mxs_dma_plat_data *)pdev->dev.platform_data;
if (!plat)
return -ENODEV;
mxs_dma_apbx.pdev = pdev;
mxs_dma_apbx.chan_base = plat->chan_base;
mxs_dma_apbx.chan_num = plat->chan_num;
platform_set_drvdata(pdev, &mxs_dma_apbx);
return mxs_dma_device_register(&mxs_dma_apbx);
}
static int __devexit dma_apbx_remove(struct platform_device *pdev)
{
return 0;
}
static struct platform_driver dma_apbx_driver = {
.probe = dma_apbx_probe,
.remove = __devexit_p(dma_apbx_remove),
.driver = {
.name = "mxs-dma-apbx"},
};
static int __init mxs_dma_apbx_init(void)
{
return platform_driver_register(&dma_apbx_driver);
}
fs_initcall(mxs_dma_apbx_init);
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