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Commit b28cb941 authored by Michael Welling's avatar Michael Welling Committed by Mark Brown
Browse files

spi: omap2-mcspi: Switch driver to use transfer_one 



Switches from transfer_one_message to transfer_one to prepare driver for
use of GPIO chip selects.

Signed-off-by: default avatarMichael Welling <mwelling@ieee.org>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 7d769802

drivers/spi/spi-omap2-mcspi.c

+110 −134
Original line number Diff line number Diff line
@@ -1052,7 +1052,8 @@ static void omap2_mcspi_cleanup(struct spi_device *spi) 
	}

}



static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m)

static int omap2_mcspi_work_one(struct omap2_mcspi *mcspi,

		struct spi_device *spi, struct spi_transfer *t)

{



	/* We only enable one channel at a time -- the one whose message is
@@ -1062,8 +1063,6 @@ static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m) 
	 * chipselect with the FORCE bit ... CS != channel enable.

	 */



	struct spi_device		*spi;

	struct spi_transfer		*t = NULL;

	struct spi_master		*master;

	struct omap2_mcspi_dma		*mcspi_dma;

	int				cs_active = 0;
@@ -1073,7 +1072,6 @@ static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m) 
	int				status = 0;

	u32				chconf;



	spi = m->spi;

	master = spi->master;

	mcspi_dma = mcspi->dma_channels + spi->chip_select;

	cs = spi->controller_state;
@@ -1090,18 +1088,14 @@ static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m) 
		par_override = 1;



	omap2_mcspi_set_enable(spi, 0);

	list_for_each_entry(t, &m->transfers, transfer_list) {

		if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) {

			status = -EINVAL;

			break;

		}



	if (par_override ||

	    (t->speed_hz != spi->max_speed_hz) ||

	    (t->bits_per_word != spi->bits_per_word)) {

		par_override = 1;

		status = omap2_mcspi_setup_transfer(spi, t);

		if (status < 0)

				break;

			goto out;

		if (t->speed_hz == spi->max_speed_hz &&

		    t->bits_per_word == spi->bits_per_word)

			par_override = 0;
@@ -1114,7 +1108,6 @@ static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m) 
			mcspi_read_cs_reg(spi, OMAP2_MCSPI_MODULCTRL);

	}





	if (!cs_active) {

		omap2_mcspi_force_cs(spi, 1);

		cs_active = 1;
@@ -1141,7 +1134,7 @@ static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m) 
		unsigned	count;



		if ((mcspi_dma->dma_rx && mcspi_dma->dma_tx) &&

			    (m->is_dma_mapped || t->len >= DMA_MIN_BYTES))

		    (t->len >= DMA_MIN_BYTES))

			omap2_mcspi_set_fifo(spi, t, 1);



		omap2_mcspi_set_enable(spi, 1);
@@ -1152,15 +1145,14 @@ static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m) 
					+ OMAP2_MCSPI_TX0);



		if ((mcspi_dma->dma_rx && mcspi_dma->dma_tx) &&

			    (m->is_dma_mapped || t->len >= DMA_MIN_BYTES))

		    (t->len >= DMA_MIN_BYTES))

			count = omap2_mcspi_txrx_dma(spi, t);

		else

			count = omap2_mcspi_txrx_pio(spi, t);

			m->actual_length += count;



		if (count != t->len) {

			status = -EIO;

				break;

			goto out;

		}

	}
@@ -1177,7 +1169,8 @@ static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m) 


	if (mcspi->fifo_depth > 0)

		omap2_mcspi_set_fifo(spi, t, 0);

	}



out:

	/* Restore defaults if they were overriden */

	if (par_override) {

		par_override = 0;
@@ -1200,29 +1193,21 @@ static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m) 
	if (mcspi->fifo_depth > 0 && t)

		omap2_mcspi_set_fifo(spi, t, 0);



	m->status = status;

	return status;

}



static int omap2_mcspi_transfer_one_message(struct spi_master *master,

		struct spi_message *m)

static int omap2_mcspi_transfer_one(struct spi_master *master,

		struct spi_device *spi, struct spi_transfer *t)

{

	struct spi_device	*spi;

	struct omap2_mcspi	*mcspi;

	struct omap2_mcspi_dma	*mcspi_dma;

	struct spi_transfer	*t;

	int status;



	spi = m->spi;

	mcspi = spi_master_get_devdata(master);

	mcspi_dma = mcspi->dma_channels + spi->chip_select;

	m->actual_length = 0;

	m->status = 0;



	list_for_each_entry(t, &m->transfers, transfer_list) {

	const void	*tx_buf = t->tx_buf;

	void		*rx_buf = t->rx_buf;

	unsigned	len = t->len;



	mcspi = spi_master_get_devdata(master);

	mcspi_dma = mcspi->dma_channels + spi->chip_select;



	if ((len && !(rx_buf || tx_buf))) {

		dev_dbg(mcspi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n",

				t->speed_hz,
@@ -1230,12 +1215,11 @@ static int omap2_mcspi_transfer_one_message(struct spi_master *master, 
				tx_buf ? "tx" : "",

				rx_buf ? "rx" : "",

				t->bits_per_word);

			status = -EINVAL;

			goto out;

		return -EINVAL;

	}



		if (m->is_dma_mapped || len < DMA_MIN_BYTES)

			continue;

	if (len < DMA_MIN_BYTES)

		goto skip_dma_map;



	if (mcspi_dma->dma_tx && tx_buf != NULL) {

		t->tx_dma = dma_map_single(mcspi->dev, (void *) tx_buf,
@@ -1243,8 +1227,7 @@ static int omap2_mcspi_transfer_one_message(struct spi_master *master, 
		if (dma_mapping_error(mcspi->dev, t->tx_dma)) {

			dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",

					'T', len);

				status = -EINVAL;

				goto out;

			return -EINVAL;

		}

	}

	if (mcspi_dma->dma_rx && rx_buf != NULL) {
@@ -1256,19 +1239,12 @@ static int omap2_mcspi_transfer_one_message(struct spi_master *master, 
			if (tx_buf != NULL)

				dma_unmap_single(mcspi->dev, t->tx_dma,

						len, DMA_TO_DEVICE);

				status = -EINVAL;

				goto out;

			}

			return -EINVAL;

		}

	}



	omap2_mcspi_work(mcspi, m);

	/* spi_finalize_current_message() changes the status inside the

	 * spi_message, save the status here. */

	status = m->status;

out:

	spi_finalize_current_message(master);

	return status;

skip_dma_map:

	return omap2_mcspi_work_one(mcspi, spi, t);

}



static int omap2_mcspi_master_setup(struct omap2_mcspi *mcspi)
@@ -1347,7 +1323,7 @@ static int omap2_mcspi_probe(struct platform_device *pdev) 
	master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);

	master->setup = omap2_mcspi_setup;

	master->auto_runtime_pm = true;

	master->transfer_one_message = omap2_mcspi_transfer_one_message;

	master->transfer_one = omap2_mcspi_transfer_one;

	master->cleanup = omap2_mcspi_cleanup;

	master->dev.of_node = node;

	master->max_speed_hz = OMAP2_MCSPI_MAX_FREQ;