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spi: dw-mid: convert to use dw_dmac instead of intel_mid_dma

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intel_mid_dma seems to be unmaintained for a long time. Moreover, the IP block
of DMA itself is the same in both dw_dmac and intel_mid_dma. This patch moves
spi-dw-midpci to use dw_dmac driver.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Andy Shevchenko
2015-03-09 16:48:50 +02:00
committed by Mark Brown
parent f89a6d8f43
commit d744f82683
3 changed files with 22 additions and 29 deletions
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45
drivers/spi/spi-dw-mid.c
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@@ -23,29 +23,31 @@
#include "spi-dw.h"
#ifdef CONFIG_SPI_DW_MID_DMA
#include <linux/intel_mid_dma.h>
#include <linux/pci.h>
#include <linux/platform_data/dma-dw.h>
#define RX_BUSY 0
#define TX_BUSY 1
struct mid_dma {
struct intel_mid_dma_slave dmas_tx;
struct intel_mid_dma_slave dmas_rx;
};
static struct dw_dma_slave mid_dma_tx = { .dst_id = 1 };
static struct dw_dma_slave mid_dma_rx = { .src_id = 0 };
static bool mid_spi_dma_chan_filter(struct dma_chan *chan, void *param)
{
struct dw_spi *dws = param;
struct dw_dma_slave *s = param;
return dws->dma_dev == chan->device->dev;
if (s->dma_dev != chan->device->dev)
return false;
chan->private = s;
return true;
}
static int mid_spi_dma_init(struct dw_spi *dws)
{
struct mid_dma *dw_dma = dws->dma_priv;
struct pci_dev *dma_dev;
struct intel_mid_dma_slave *rxs, *txs;
struct dw_dma_slave *tx = dws->dma_tx;
struct dw_dma_slave *rx = dws->dma_rx;
dma_cap_mask_t mask;
/*
@@ -56,29 +58,21 @@ static int mid_spi_dma_init(struct dw_spi *dws)
if (!dma_dev)
return -ENODEV;
dws->dma_dev = &dma_dev->dev;
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
/* 1. Init rx channel */
dws->rxchan = dma_request_channel(mask, mid_spi_dma_chan_filter, dws);
rx->dma_dev = &dma_dev->dev;
dws->rxchan = dma_request_channel(mask, mid_spi_dma_chan_filter, rx);
if (!dws->rxchan)
goto err_exit;
rxs = &dw_dma->dmas_rx;
rxs->hs_mode = LNW_DMA_HW_HS;
rxs->cfg_mode = LNW_DMA_PER_TO_MEM;
dws->rxchan->private = rxs;
dws->master->dma_rx = dws->rxchan;
/* 2. Init tx channel */
dws->txchan = dma_request_channel(mask, mid_spi_dma_chan_filter, dws);
tx->dma_dev = &dma_dev->dev;
dws->txchan = dma_request_channel(mask, mid_spi_dma_chan_filter, tx);
if (!dws->txchan)
goto free_rxchan;
txs = &dw_dma->dmas_tx;
txs->hs_mode = LNW_DMA_HW_HS;
txs->cfg_mode = LNW_DMA_MEM_TO_PER;
dws->txchan->private = txs;
dws->master->dma_tx = dws->txchan;
dws->dma_inited = 1;
@@ -163,7 +157,7 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws,
txconf.direction = DMA_MEM_TO_DEV;
txconf.dst_addr = dws->dma_addr;
txconf.dst_maxburst = LNW_DMA_MSIZE_16;
txconf.dst_maxburst = 16;
txconf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
txconf.dst_addr_width = convert_dma_width(dws->dma_width);
txconf.device_fc = false;
@@ -209,7 +203,7 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws,
rxconf.direction = DMA_DEV_TO_MEM;
rxconf.src_addr = dws->dma_addr;
rxconf.src_maxburst = LNW_DMA_MSIZE_16;
rxconf.src_maxburst = 16;
rxconf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
rxconf.src_addr_width = convert_dma_width(dws->dma_width);
rxconf.device_fc = false;
@@ -328,9 +322,8 @@ int dw_spi_mid_init(struct dw_spi *dws)
iounmap(clk_reg);
#ifdef CONFIG_SPI_DW_MID_DMA
dws->dma_priv = kzalloc(sizeof(struct mid_dma), GFP_KERNEL);
if (!dws->dma_priv)
return -ENOMEM;
dws->dma_tx = &mid_dma_tx;
dws->dma_rx = &mid_dma_rx;
dws->dma_ops = &mid_dma_ops;
#endif
return 0;