146 lines
3.6 KiB
C
146 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (C) 2007-2008 Atmel Corporation
|
|
// Copyright (C) 2010-2011 ST Microelectronics
|
|
// Copyright (C) 2013,2018 Intel Corporation
|
|
|
|
#include <linux/bitops.h>
|
|
#include <linux/dmaengine.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/types.h>
|
|
|
|
#include "internal.h"
|
|
|
|
static void dw_dma_initialize_chan(struct dw_dma_chan *dwc)
|
|
{
|
|
struct dw_dma *dw = to_dw_dma(dwc->chan.device);
|
|
u32 cfghi = is_slave_direction(dwc->direction) ? 0 : DWC_CFGH_FIFO_MODE;
|
|
u32 cfglo = DWC_CFGL_CH_PRIOR(dwc->priority);
|
|
bool hs_polarity = dwc->dws.hs_polarity;
|
|
|
|
cfghi |= DWC_CFGH_DST_PER(dwc->dws.dst_id);
|
|
cfghi |= DWC_CFGH_SRC_PER(dwc->dws.src_id);
|
|
cfghi |= DWC_CFGH_PROTCTL(dw->pdata->protctl);
|
|
|
|
/* Set polarity of handshake interface */
|
|
cfglo |= hs_polarity ? DWC_CFGL_HS_DST_POL | DWC_CFGL_HS_SRC_POL : 0;
|
|
|
|
channel_writel(dwc, CFG_LO, cfglo);
|
|
channel_writel(dwc, CFG_HI, cfghi);
|
|
}
|
|
|
|
static void dw_dma_suspend_chan(struct dw_dma_chan *dwc, bool drain)
|
|
{
|
|
u32 cfglo = channel_readl(dwc, CFG_LO);
|
|
|
|
channel_writel(dwc, CFG_LO, cfglo | DWC_CFGL_CH_SUSP);
|
|
}
|
|
|
|
static void dw_dma_resume_chan(struct dw_dma_chan *dwc, bool drain)
|
|
{
|
|
u32 cfglo = channel_readl(dwc, CFG_LO);
|
|
|
|
channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP);
|
|
}
|
|
|
|
static u32 dw_dma_bytes2block(struct dw_dma_chan *dwc,
|
|
size_t bytes, unsigned int width, size_t *len)
|
|
{
|
|
u32 block;
|
|
|
|
if ((bytes >> width) > dwc->block_size) {
|
|
block = dwc->block_size;
|
|
*len = dwc->block_size << width;
|
|
} else {
|
|
block = bytes >> width;
|
|
*len = bytes;
|
|
}
|
|
|
|
return block;
|
|
}
|
|
|
|
static size_t dw_dma_block2bytes(struct dw_dma_chan *dwc, u32 block, u32 width)
|
|
{
|
|
return DWC_CTLH_BLOCK_TS(block) << width;
|
|
}
|
|
|
|
static inline u8 dw_dma_encode_maxburst(u32 maxburst)
|
|
{
|
|
/*
|
|
* Fix burst size according to dw_dmac. We need to convert them as:
|
|
* 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3.
|
|
*/
|
|
return maxburst > 1 ? fls(maxburst) - 2 : 0;
|
|
}
|
|
|
|
static u32 dw_dma_prepare_ctllo(struct dw_dma_chan *dwc)
|
|
{
|
|
struct dma_slave_config *sconfig = &dwc->dma_sconfig;
|
|
u8 smsize = 0, dmsize = 0;
|
|
u8 sms, dms;
|
|
|
|
if (dwc->direction == DMA_MEM_TO_DEV) {
|
|
sms = dwc->dws.m_master;
|
|
dms = dwc->dws.p_master;
|
|
dmsize = dw_dma_encode_maxburst(sconfig->dst_maxburst);
|
|
} else if (dwc->direction == DMA_DEV_TO_MEM) {
|
|
sms = dwc->dws.p_master;
|
|
dms = dwc->dws.m_master;
|
|
smsize = dw_dma_encode_maxburst(sconfig->src_maxburst);
|
|
} else /* DMA_MEM_TO_MEM */ {
|
|
sms = dwc->dws.m_master;
|
|
dms = dwc->dws.m_master;
|
|
}
|
|
|
|
return DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN |
|
|
DWC_CTLL_DST_MSIZE(dmsize) | DWC_CTLL_SRC_MSIZE(smsize) |
|
|
DWC_CTLL_DMS(dms) | DWC_CTLL_SMS(sms);
|
|
}
|
|
|
|
static void dw_dma_set_device_name(struct dw_dma *dw, int id)
|
|
{
|
|
snprintf(dw->name, sizeof(dw->name), "dw:dmac%d", id);
|
|
}
|
|
|
|
static void dw_dma_disable(struct dw_dma *dw)
|
|
{
|
|
do_dw_dma_off(dw);
|
|
}
|
|
|
|
static void dw_dma_enable(struct dw_dma *dw)
|
|
{
|
|
do_dw_dma_on(dw);
|
|
}
|
|
|
|
int dw_dma_probe(struct dw_dma_chip *chip)
|
|
{
|
|
struct dw_dma *dw;
|
|
|
|
dw = devm_kzalloc(chip->dev, sizeof(*dw), GFP_KERNEL);
|
|
if (!dw)
|
|
return -ENOMEM;
|
|
|
|
/* Channel operations */
|
|
dw->initialize_chan = dw_dma_initialize_chan;
|
|
dw->suspend_chan = dw_dma_suspend_chan;
|
|
dw->resume_chan = dw_dma_resume_chan;
|
|
dw->prepare_ctllo = dw_dma_prepare_ctllo;
|
|
dw->bytes2block = dw_dma_bytes2block;
|
|
dw->block2bytes = dw_dma_block2bytes;
|
|
|
|
/* Device operations */
|
|
dw->set_device_name = dw_dma_set_device_name;
|
|
dw->disable = dw_dma_disable;
|
|
dw->enable = dw_dma_enable;
|
|
|
|
chip->dw = dw;
|
|
return do_dma_probe(chip);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dw_dma_probe);
|
|
|
|
int dw_dma_remove(struct dw_dma_chip *chip)
|
|
{
|
|
return do_dma_remove(chip);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dw_dma_remove);
|