[mirror_ubuntu-artful-kernel.git] / drivers / spi / spi-pxa2xx-dma.c

/*
 * PXA2xx SPI DMA engine support.
 *
 * Copyright (C) 2013, Intel Corporation
 * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/pxa2xx_ssp.h>
#include <linux/scatterlist.h>
#include <linux/sizes.h>
#include <linux/spi/spi.h>
#include <linux/spi/pxa2xx_spi.h>

#include "spi-pxa2xx.h"

static int pxa2xx_spi_map_dma_buffer(struct driver_data *drv_data,
				     enum dma_data_direction dir)
{
	int i, nents, len = drv_data->len;
	struct scatterlist *sg;
	struct device *dmadev;
	struct sg_table *sgt;
	void *buf, *pbuf;

	if (dir == DMA_TO_DEVICE) {
		dmadev = drv_data->tx_chan->device->dev;
		sgt = &drv_data->tx_sgt;
		buf = drv_data->tx;
		drv_data->tx_map_len = len;
	} else {
		dmadev = drv_data->rx_chan->device->dev;
		sgt = &drv_data->rx_sgt;
		buf = drv_data->rx;
		drv_data->rx_map_len = len;
	}

	nents = DIV_ROUND_UP(len, SZ_2K);
	if (nents != sgt->nents) {
		int ret;

		sg_free_table(sgt);
		ret = sg_alloc_table(sgt, nents, GFP_ATOMIC);
		if (ret)
			return ret;
	}

	pbuf = buf;
	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
		size_t bytes = min_t(size_t, len, SZ_2K);

		if (buf)
			sg_set_buf(sg, pbuf, bytes);
		else
			sg_set_buf(sg, drv_data->dummy, bytes);

		pbuf += bytes;
		len -= bytes;
	}

	nents = dma_map_sg(dmadev, sgt->sgl, sgt->nents, dir);
	if (!nents)
		return -ENOMEM;

	return nents;
}

static void pxa2xx_spi_unmap_dma_buffer(struct driver_data *drv_data,
					enum dma_data_direction dir)
{
	struct device *dmadev;
	struct sg_table *sgt;

	if (dir == DMA_TO_DEVICE) {
		dmadev = drv_data->tx_chan->device->dev;
		sgt = &drv_data->tx_sgt;
	} else {
		dmadev = drv_data->rx_chan->device->dev;
		sgt = &drv_data->rx_sgt;
	}

	dma_unmap_sg(dmadev, sgt->sgl, sgt->nents, dir);
}

static void pxa2xx_spi_unmap_dma_buffers(struct driver_data *drv_data)
{
	if (!drv_data->dma_mapped)
		return;

	pxa2xx_spi_unmap_dma_buffer(drv_data, DMA_FROM_DEVICE);
	pxa2xx_spi_unmap_dma_buffer(drv_data, DMA_TO_DEVICE);

	drv_data->dma_mapped = 0;
}

static void pxa2xx_spi_dma_transfer_complete(struct driver_data *drv_data,
					     bool error)
{
	struct spi_message *msg = drv_data->cur_msg;

	/*
	 * It is possible that one CPU is handling ROR interrupt and other
	 * just gets DMA completion. Calling pump_transfers() twice for the
	 * same transfer leads to problems thus we prevent concurrent calls
	 * by using ->dma_running.
	 */
	if (atomic_dec_and_test(&drv_data->dma_running)) {
		void __iomem *reg = drv_data->ioaddr;

		/*
		 * If the other CPU is still handling the ROR interrupt we
		 * might not know about the error yet. So we re-check the
		 * ROR bit here before we clear the status register.
		 */
		if (!error) {
			u32 status = read_SSSR(reg) & drv_data->mask_sr;
			error = status & SSSR_ROR;
		}

		/* Clear status & disable interrupts */
		write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
		write_SSSR_CS(drv_data, drv_data->clear_sr);
		if (!pxa25x_ssp_comp(drv_data))
			write_SSTO(0, reg);

		if (!error) {
			pxa2xx_spi_unmap_dma_buffers(drv_data);

			drv_data->tx += drv_data->tx_map_len;
			drv_data->rx += drv_data->rx_map_len;

			msg->actual_length += drv_data->len;
			msg->state = pxa2xx_spi_next_transfer(drv_data);
		} else {
			/* In case we got an error we disable the SSP now */
			write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);

			msg->state = ERROR_STATE;
		}

		tasklet_schedule(&drv_data->pump_transfers);
	}
}

static void pxa2xx_spi_dma_callback(void *data)
{
	pxa2xx_spi_dma_transfer_complete(data, false);
}

static struct dma_async_tx_descriptor *
pxa2xx_spi_dma_prepare_one(struct driver_data *drv_data,
			   enum dma_transfer_direction dir)
{
	struct chip_data *chip = drv_data->cur_chip;
	enum dma_slave_buswidth width;
	struct dma_slave_config cfg;
	struct dma_chan *chan;
	struct sg_table *sgt;
	int nents, ret;

	switch (drv_data->n_bytes) {
	case 1:
		width = DMA_SLAVE_BUSWIDTH_1_BYTE;
		break;
	case 2:
		width = DMA_SLAVE_BUSWIDTH_2_BYTES;
		break;
	default:
		width = DMA_SLAVE_BUSWIDTH_4_BYTES;
		break;
	}

	memset(&cfg, 0, sizeof(cfg));
	cfg.direction = dir;

	if (dir == DMA_MEM_TO_DEV) {
		cfg.dst_addr = drv_data->ssdr_physical;
		cfg.dst_addr_width = width;
		cfg.dst_maxburst = chip->dma_burst_size;

		sgt = &drv_data->tx_sgt;
		nents = drv_data->tx_nents;
		chan = drv_data->tx_chan;
	} else {
		cfg.src_addr = drv_data->ssdr_physical;
		cfg.src_addr_width = width;
		cfg.src_maxburst = chip->dma_burst_size;

		sgt = &drv_data->rx_sgt;
		nents = drv_data->rx_nents;
		chan = drv_data->rx_chan;
	}

	ret = dmaengine_slave_config(chan, &cfg);
	if (ret) {
		dev_warn(&drv_data->pdev->dev, "DMA slave config failed\n");
		return NULL;
	}

	return dmaengine_prep_slave_sg(chan, sgt->sgl, nents, dir,
				       DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
}

bool pxa2xx_spi_dma_is_possible(size_t len)
{
	return len <= MAX_DMA_LEN;
}

int pxa2xx_spi_map_dma_buffers(struct driver_data *drv_data)
{
	const struct chip_data *chip = drv_data->cur_chip;
	int ret;

	if (!chip->enable_dma)
		return 0;

	/* Don't bother with DMA if we can't do even a single burst */
	if (drv_data->len < chip->dma_burst_size)
		return 0;

	ret = pxa2xx_spi_map_dma_buffer(drv_data, DMA_TO_DEVICE);
	if (ret <= 0) {
		dev_warn(&drv_data->pdev->dev, "failed to DMA map TX\n");
		return 0;
	}

	drv_data->tx_nents = ret;

	ret = pxa2xx_spi_map_dma_buffer(drv_data, DMA_FROM_DEVICE);
	if (ret <= 0) {
		pxa2xx_spi_unmap_dma_buffer(drv_data, DMA_TO_DEVICE);
		dev_warn(&drv_data->pdev->dev, "failed to DMA map RX\n");
		return 0;
	}

	drv_data->rx_nents = ret;
	return 1;
}

irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data)
{
	u32 status;

	status = read_SSSR(drv_data->ioaddr) & drv_data->mask_sr;
	if (status & SSSR_ROR) {
		dev_err(&drv_data->pdev->dev, "FIFO overrun\n");

		dmaengine_terminate_all(drv_data->rx_chan);
		dmaengine_terminate_all(drv_data->tx_chan);

		pxa2xx_spi_dma_transfer_complete(drv_data, true);
		return IRQ_HANDLED;
	}

	return IRQ_NONE;
}

int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, u32 dma_burst)
{
	struct dma_async_tx_descriptor *tx_desc, *rx_desc;

	tx_desc = pxa2xx_spi_dma_prepare_one(drv_data, DMA_MEM_TO_DEV);
	if (!tx_desc) {
		dev_err(&drv_data->pdev->dev,
			"failed to get DMA TX descriptor\n");
		return -EBUSY;
	}

	rx_desc = pxa2xx_spi_dma_prepare_one(drv_data, DMA_DEV_TO_MEM);
	if (!rx_desc) {
		dev_err(&drv_data->pdev->dev,
			"failed to get DMA RX descriptor\n");
		return -EBUSY;
	}

	/* We are ready when RX completes */
	rx_desc->callback = pxa2xx_spi_dma_callback;
	rx_desc->callback_param = drv_data;

	dmaengine_submit(rx_desc);
	dmaengine_submit(tx_desc);
	return 0;
}

void pxa2xx_spi_dma_start(struct driver_data *drv_data)
{
	dma_async_issue_pending(drv_data->rx_chan);
	dma_async_issue_pending(drv_data->tx_chan);

	atomic_set(&drv_data->dma_running, 1);
}

int pxa2xx_spi_dma_setup(struct driver_data *drv_data)
{
	struct pxa2xx_spi_master *pdata = drv_data->master_info;
	struct device *dev = &drv_data->pdev->dev;
	dma_cap_mask_t mask;

	dma_cap_zero(mask);
	dma_cap_set(DMA_SLAVE, mask);

	drv_data->dummy = devm_kzalloc(dev, SZ_2K, GFP_KERNEL);
	if (!drv_data->dummy)
		return -ENOMEM;

	drv_data->tx_chan = dma_request_slave_channel_compat(mask,
				pdata->dma_filter, pdata->tx_param, dev, "tx");
	if (!drv_data->tx_chan)
		return -ENODEV;

	drv_data->rx_chan = dma_request_slave_channel_compat(mask,
				pdata->dma_filter, pdata->rx_param, dev, "rx");
	if (!drv_data->rx_chan) {
		dma_release_channel(drv_data->tx_chan);
		drv_data->tx_chan = NULL;
		return -ENODEV;
	}

	return 0;
}

void pxa2xx_spi_dma_release(struct driver_data *drv_data)
{
	if (drv_data->rx_chan) {
		dmaengine_terminate_all(drv_data->rx_chan);
		dma_release_channel(drv_data->rx_chan);
		sg_free_table(&drv_data->rx_sgt);
		drv_data->rx_chan = NULL;
	}
	if (drv_data->tx_chan) {
		dmaengine_terminate_all(drv_data->tx_chan);
		dma_release_channel(drv_data->tx_chan);
		sg_free_table(&drv_data->tx_sgt);
		drv_data->tx_chan = NULL;
	}
}

void pxa2xx_spi_dma_resume(struct driver_data *drv_data)
{
}

int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip,
					   struct spi_device *spi,
					   u8 bits_per_word, u32 *burst_code,
					   u32 *threshold)
{
	struct pxa2xx_spi_chip *chip_info = spi->controller_data;

	/*
	 * If the DMA burst size is given in chip_info we use that,
	 * otherwise we use the default. Also we use the default FIFO
	 * thresholds for now.
	 */
	*burst_code = chip_info ? chip_info->dma_burst_size : 1;
	*threshold = SSCR1_RxTresh(RX_THRESH_DFLT)
		   | SSCR1_TxTresh(TX_THRESH_DFLT);

	return 0;
}
Commit	Line	Data
5928808e MW	1	/*
	2	* PXA2xx SPI DMA engine support.
	3	*
	4	* Copyright (C) 2013, Intel Corporation
	5	* Author: Mika Westerberg <mika.westerberg@linux.intel.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
5928808e MW	12	#include <linux/device.h>
	13	#include <linux/dma-mapping.h>
	14	#include <linux/dmaengine.h>
	15	#include <linux/pxa2xx_ssp.h>
	16	#include <linux/scatterlist.h>
	17	#include <linux/sizes.h>
	18	#include <linux/spi/spi.h>
	19	#include <linux/spi/pxa2xx_spi.h>
	20
	21	#include "spi-pxa2xx.h"
	22
	23	static int pxa2xx_spi_map_dma_buffer(struct driver_data *drv_data,
	24	enum dma_data_direction dir)
	25	{
	26	int i, nents, len = drv_data->len;
	27	struct scatterlist *sg;
	28	struct device *dmadev;
	29	struct sg_table *sgt;
	30	void buf, pbuf;
	31
5928808e MW	32	if (dir == DMA_TO_DEVICE) {
	33	dmadev = drv_data->tx_chan->device->dev;
	34	sgt = &drv_data->tx_sgt;
	35	buf = drv_data->tx;
	36	drv_data->tx_map_len = len;
	37	} else {
	38	dmadev = drv_data->rx_chan->device->dev;
	39	sgt = &drv_data->rx_sgt;
	40	buf = drv_data->rx;
	41	drv_data->rx_map_len = len;
	42	}
	43
	44	nents = DIV_ROUND_UP(len, SZ_2K);
	45	if (nents != sgt->nents) {
	46	int ret;
	47
	48	sg_free_table(sgt);
5548f98c	49	ret = sg_alloc_table(sgt, nents, GFP_ATOMIC);
5928808e MW	50	if (ret)
	51	return ret;
	52	}
	53
	54	pbuf = buf;
	55	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
	56	size_t bytes = min_t(size_t, len, SZ_2K);
	57
	58	if (buf)
	59	sg_set_buf(sg, pbuf, bytes);
	60	else
	61	sg_set_buf(sg, drv_data->dummy, bytes);
	62
	63	pbuf += bytes;
	64	len -= bytes;
	65	}
	66
	67	nents = dma_map_sg(dmadev, sgt->sgl, sgt->nents, dir);
	68	if (!nents)
	69	return -ENOMEM;
	70
	71	return nents;
	72	}
	73
	74	static void pxa2xx_spi_unmap_dma_buffer(struct driver_data *drv_data,
	75	enum dma_data_direction dir)
	76	{
	77	struct device *dmadev;
	78	struct sg_table *sgt;
	79
	80	if (dir == DMA_TO_DEVICE) {
	81	dmadev = drv_data->tx_chan->device->dev;
	82	sgt = &drv_data->tx_sgt;
	83	} else {
	84	dmadev = drv_data->rx_chan->device->dev;
	85	sgt = &drv_data->rx_sgt;
	86	}
	87
	88	dma_unmap_sg(dmadev, sgt->sgl, sgt->nents, dir);
	89	}
	90
	91	static void pxa2xx_spi_unmap_dma_buffers(struct driver_data *drv_data)
	92	{
	93	if (!drv_data->dma_mapped)
	94	return;
	95
	96	pxa2xx_spi_unmap_dma_buffer(drv_data, DMA_FROM_DEVICE);
	97	pxa2xx_spi_unmap_dma_buffer(drv_data, DMA_TO_DEVICE);
	98
	99	drv_data->dma_mapped = 0;
	100	}
	101
	102	static void pxa2xx_spi_dma_transfer_complete(struct driver_data *drv_data,
	103	bool error)
	104	{
	105	struct spi_message *msg = drv_data->cur_msg;
	106
	107	/*
	108	* It is possible that one CPU is handling ROR interrupt and other
	109	* just gets DMA completion. Calling pump_transfers() twice for the
	110	* same transfer leads to problems thus we prevent concurrent calls
	111	* by using ->dma_running.
	112	*/
	113	if (atomic_dec_and_test(&drv_data->dma_running)) {
114	void __iomem *reg = drv_data->ioaddr;
115
116	/*
117	* If the other CPU is still handling the ROR interrupt we
118	* might not know about the error yet. So we re-check the
119	* ROR bit here before we clear the status register.
120	*/
121	if (!error) {
122	u32 status = read_SSSR(reg) & drv_data->mask_sr;
123	error = status & SSSR_ROR;
124	}
125
126	/* Clear status & disable interrupts */
127	write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
128	write_SSSR_CS(drv_data, drv_data->clear_sr);
129	if (!pxa25x_ssp_comp(drv_data))
130	write_SSTO(0, reg);
131
132	if (!error) {
133	pxa2xx_spi_unmap_dma_buffers(drv_data);
134
5928808e	135	drv_data->tx += drv_data->tx_map_len;
5928808e	136	drv_data->rx += drv_data->rx_map_len;
5928808e MW	137
	138	msg->actual_length += drv_data->len;
	139	msg->state = pxa2xx_spi_next_transfer(drv_data);
	140	} else {
	141	/* In case we got an error we disable the SSP now */
	142	write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);
	143
	144	msg->state = ERROR_STATE;
	145	}
	146
	147	tasklet_schedule(&drv_data->pump_transfers);
	148	}
	149	}
	150
	151	static void pxa2xx_spi_dma_callback(void *data)
	152	{
	153	pxa2xx_spi_dma_transfer_complete(data, false);
	154	}
	155
	156	static struct dma_async_tx_descriptor *
	157	pxa2xx_spi_dma_prepare_one(struct driver_data *drv_data,
	158	enum dma_transfer_direction dir)
	159	{
5928808e MW	160	struct chip_data *chip = drv_data->cur_chip;
	161	enum dma_slave_buswidth width;
	162	struct dma_slave_config cfg;
	163	struct dma_chan *chan;
	164	struct sg_table *sgt;
	165	int nents, ret;
	166
	167	switch (drv_data->n_bytes) {
	168	case 1:
	169	width = DMA_SLAVE_BUSWIDTH_1_BYTE;
	170	break;
	171	case 2:
	172	width = DMA_SLAVE_BUSWIDTH_2_BYTES;
	173	break;
	174	default:
	175	width = DMA_SLAVE_BUSWIDTH_4_BYTES;
	176	break;
	177	}
	178
	179	memset(&cfg, 0, sizeof(cfg));
	180	cfg.direction = dir;
	181
	182	if (dir == DMA_MEM_TO_DEV) {
	183	cfg.dst_addr = drv_data->ssdr_physical;
	184	cfg.dst_addr_width = width;
	185	cfg.dst_maxburst = chip->dma_burst_size;
5928808e MW	186
	187	sgt = &drv_data->tx_sgt;
	188	nents = drv_data->tx_nents;
	189	chan = drv_data->tx_chan;
	190	} else {
	191	cfg.src_addr = drv_data->ssdr_physical;
	192	cfg.src_addr_width = width;
	193	cfg.src_maxburst = chip->dma_burst_size;
5928808e MW	194
	195	sgt = &drv_data->rx_sgt;
	196	nents = drv_data->rx_nents;
	197	chan = drv_data->rx_chan;
	198	}
	199
	200	ret = dmaengine_slave_config(chan, &cfg);
	201	if (ret) {
	202	dev_warn(&drv_data->pdev->dev, "DMA slave config failed\n");
	203	return NULL;
	204	}
	205
	206	return dmaengine_prep_slave_sg(chan, sgt->sgl, nents, dir,
	207	DMA_PREP_INTERRUPT \| DMA_CTRL_ACK);
	208	}
	209
5928808e MW	210	bool pxa2xx_spi_dma_is_possible(size_t len)
	211	{
	212	return len <= MAX_DMA_LEN;
	213	}
	214
	215	int pxa2xx_spi_map_dma_buffers(struct driver_data *drv_data)
	216	{
	217	const struct chip_data *chip = drv_data->cur_chip;
	218	int ret;
	219
	220	if (!chip->enable_dma)
	221	return 0;
	222
	223	/* Don't bother with DMA if we can't do even a single burst */
	224	if (drv_data->len < chip->dma_burst_size)
	225	return 0;
	226
	227	ret = pxa2xx_spi_map_dma_buffer(drv_data, DMA_TO_DEVICE);
	228	if (ret <= 0) {
	229	dev_warn(&drv_data->pdev->dev, "failed to DMA map TX\n");
	230	return 0;
	231	}
	232
	233	drv_data->tx_nents = ret;
	234
	235	ret = pxa2xx_spi_map_dma_buffer(drv_data, DMA_FROM_DEVICE);
	236	if (ret <= 0) {
	237	pxa2xx_spi_unmap_dma_buffer(drv_data, DMA_TO_DEVICE);
	238	dev_warn(&drv_data->pdev->dev, "failed to DMA map RX\n");
	239	return 0;
	240	}
	241
	242	drv_data->rx_nents = ret;
	243	return 1;
	244	}
	245
	246	irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data)
	247	{
	248	u32 status;
	249
	250	status = read_SSSR(drv_data->ioaddr) & drv_data->mask_sr;
	251	if (status & SSSR_ROR) {
	252	dev_err(&drv_data->pdev->dev, "FIFO overrun\n");
	253
	254	dmaengine_terminate_all(drv_data->rx_chan);
	255	dmaengine_terminate_all(drv_data->tx_chan);
	256
	257	pxa2xx_spi_dma_transfer_complete(drv_data, true);
	258	return IRQ_HANDLED;
	259	}
	260
	261	return IRQ_NONE;
	262	}
	263
	264	int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, u32 dma_burst)
	265	{
	266	struct dma_async_tx_descriptor tx_desc, rx_desc;
	267
	268	tx_desc = pxa2xx_spi_dma_prepare_one(drv_data, DMA_MEM_TO_DEV);
	269	if (!tx_desc) {
	270	dev_err(&drv_data->pdev->dev,
	271	"failed to get DMA TX descriptor\n");
	272	return -EBUSY;
	273	}
274
275	rx_desc = pxa2xx_spi_dma_prepare_one(drv_data, DMA_DEV_TO_MEM);
276	if (!rx_desc) {
277	dev_err(&drv_data->pdev->dev,
278	"failed to get DMA RX descriptor\n");
279	return -EBUSY;
280	}
281
282	/* We are ready when RX completes */
283	rx_desc->callback = pxa2xx_spi_dma_callback;
284	rx_desc->callback_param = drv_data;
285
286	dmaengine_submit(rx_desc);
287	dmaengine_submit(tx_desc);
288	return 0;
289	}
290
291	void pxa2xx_spi_dma_start(struct driver_data *drv_data)
292	{
293	dma_async_issue_pending(drv_data->rx_chan);
294	dma_async_issue_pending(drv_data->tx_chan);
295
296	atomic_set(&drv_data->dma_running, 1);
297	}
298
299	int pxa2xx_spi_dma_setup(struct driver_data *drv_data)
300	{
301	struct pxa2xx_spi_master *pdata = drv_data->master_info;
cddb339b	302	struct device *dev = &drv_data->pdev->dev;
5928808e MW	303	dma_cap_mask_t mask;
	304
	305	dma_cap_zero(mask);
	306	dma_cap_set(DMA_SLAVE, mask);
	307
cddb339b	308	drv_data->dummy = devm_kzalloc(dev, SZ_2K, GFP_KERNEL);
5928808e MW	309	if (!drv_data->dummy)
	310	return -ENOMEM;
	311
cddb339b	312	drv_data->tx_chan = dma_request_slave_channel_compat(mask,
b729bf34	313	pdata->dma_filter, pdata->tx_param, dev, "tx");
5928808e MW	314	if (!drv_data->tx_chan)
	315	return -ENODEV;
	316
cddb339b	317	drv_data->rx_chan = dma_request_slave_channel_compat(mask,
b729bf34	318	pdata->dma_filter, pdata->rx_param, dev, "rx");
5928808e MW	319	if (!drv_data->rx_chan) {
	320	dma_release_channel(drv_data->tx_chan);
	321	drv_data->tx_chan = NULL;
	322	return -ENODEV;
	323	}
	324
	325	return 0;
	326	}
	327
	328	void pxa2xx_spi_dma_release(struct driver_data *drv_data)
	329	{
	330	if (drv_data->rx_chan) {
	331	dmaengine_terminate_all(drv_data->rx_chan);
	332	dma_release_channel(drv_data->rx_chan);
	333	sg_free_table(&drv_data->rx_sgt);
	334	drv_data->rx_chan = NULL;
	335	}
	336	if (drv_data->tx_chan) {
	337	dmaengine_terminate_all(drv_data->tx_chan);
	338	dma_release_channel(drv_data->tx_chan);
	339	sg_free_table(&drv_data->tx_sgt);
	340	drv_data->tx_chan = NULL;
	341	}
	342	}
	343
	344	void pxa2xx_spi_dma_resume(struct driver_data *drv_data)
	345	{
	346	}
	347
	348	int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip,
	349	struct spi_device *spi,
	350	u8 bits_per_word, u32 *burst_code,
	351	u32 *threshold)
	352	{
	353	struct pxa2xx_spi_chip *chip_info = spi->controller_data;
	354
	355	/*
	356	* If the DMA burst size is given in chip_info we use that,
	357	* otherwise we use the default. Also we use the default FIFO
	358	* thresholds for now.
	359	*/
01d7aafb	360	*burst_code = chip_info ? chip_info->dma_burst_size : 1;
5928808e MW	361	*threshold = SSCR1_RxTresh(RX_THRESH_DFLT)
	362	\| SSCR1_TxTresh(TX_THRESH_DFLT);
	363
	364	return 0;
	365	}