Commit 5dc47fef authored by Varadarajan Narayanan's avatar Varadarajan Narayanan Committed by Mark Brown
Browse files

spi: qup: allow block mode to generate multiple transactions 



This let's you write more to the SPI bus than 64K-1 which is important
if the block size of a SPI device is >= 64K or some other device wants
to do something larger.

This has the benefit of completely removing spi_message from the spi-qup
transactions

Signed-off-by: default avatarMatthew McClintock <mmcclint@codeaurora.org>
Signed-off-by: default avatarVaradarajan Narayanan <varada@codeaurora.org>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 3b5ea2c9

drivers/spi/spi-qup.c

+80 −48
Original line number Diff line number Diff line
@@ -120,7 +120,7 @@ 


#define SPI_NUM_CHIPSELECTS		4



#define SPI_MAX_DMA_XFER		(SZ_64K - 64)

#define SPI_MAX_XFER			(SZ_64K - 64)



/* high speed mode is when bus rate is greater then 26MHz */

#define SPI_HS_MIN_RATE			26000000
@@ -149,6 +149,8 @@ struct spi_qup { 
	int			n_words;

	int			tx_bytes;

	int			rx_bytes;

	const u8		*tx_buf;

	u8			*rx_buf;

	int			qup_v1;



	int			mode;
@@ -173,6 +175,12 @@ static inline bool spi_qup_is_dma_xfer(int mode) 
	return false;

}



/* get's the transaction size length */

static inline unsigned int spi_qup_len(struct spi_qup *controller)

{

	return controller->n_words * controller->w_size;

}



static inline bool spi_qup_is_valid_state(struct spi_qup *controller)

{

	u32 opstate = readl_relaxed(controller->base + QUP_STATE);
@@ -225,10 +233,9 @@ static int spi_qup_set_state(struct spi_qup *controller, u32 state) 
	return 0;

}



static void spi_qup_read_from_fifo(struct spi_qup *controller,

	struct spi_transfer *xfer, u32 num_words)

static void spi_qup_read_from_fifo(struct spi_qup *controller, u32 num_words)

{

	u8 *rx_buf = xfer->rx_buf;

	u8 *rx_buf = controller->rx_buf;

	int i, shift, num_bytes;

	u32 word;
@@ -236,7 +243,8 @@ static void spi_qup_read_from_fifo(struct spi_qup *controller, 


		word = readl_relaxed(controller->base + QUP_INPUT_FIFO);



		num_bytes = min_t(int, xfer->len - controller->rx_bytes,

		num_bytes = min_t(int, spi_qup_len(controller) -

				       controller->rx_bytes,

				       controller->w_size);



		if (!rx_buf) {
@@ -258,13 +266,12 @@ static void spi_qup_read_from_fifo(struct spi_qup *controller, 
	}

}



static void spi_qup_read(struct spi_qup *controller,

			    struct spi_transfer *xfer)

static void spi_qup_read(struct spi_qup *controller)

{

	u32 remainder, words_per_block, num_words;

	bool is_block_mode = controller->mode == QUP_IO_M_MODE_BLOCK;



	remainder = DIV_ROUND_UP(xfer->len - controller->rx_bytes,

	remainder = DIV_ROUND_UP(spi_qup_len(controller) - controller->rx_bytes,

				 controller->w_size);

	words_per_block = controller->in_blk_sz >> 2;
@@ -285,7 +292,7 @@ static void spi_qup_read(struct spi_qup *controller, 
		}



		/* read up to the maximum transfer size available */

		spi_qup_read_from_fifo(controller, xfer, num_words);

		spi_qup_read_from_fifo(controller, num_words);



		remainder -= num_words;
@@ -307,17 +314,17 @@ static void spi_qup_read(struct spi_qup *controller, 


}



static void spi_qup_write_to_fifo(struct spi_qup *controller,

	struct spi_transfer *xfer, u32 num_words)

static void spi_qup_write_to_fifo(struct spi_qup *controller, u32 num_words)

{

	const u8 *tx_buf = xfer->tx_buf;

	const u8 *tx_buf = controller->tx_buf;

	int i, num_bytes;

	u32 word, data;



	for (; num_words; num_words--) {

		word = 0;



		num_bytes = min_t(int, xfer->len - controller->tx_bytes,

		num_bytes = min_t(int, spi_qup_len(controller) -

				       controller->tx_bytes,

				       controller->w_size);

		if (tx_buf)

			for (i = 0; i < num_bytes; i++) {
@@ -338,13 +345,12 @@ static void spi_qup_dma_done(void *data) 
	complete(&qup->done);

}



static void spi_qup_write(struct spi_qup *controller,

			    struct spi_transfer *xfer)

static void spi_qup_write(struct spi_qup *controller)

{

	bool is_block_mode = controller->mode == QUP_IO_M_MODE_BLOCK;

	u32 remainder, words_per_block, num_words;



	remainder = DIV_ROUND_UP(xfer->len - controller->tx_bytes,

	remainder = DIV_ROUND_UP(spi_qup_len(controller) - controller->tx_bytes,

				 controller->w_size);

	words_per_block = controller->out_blk_sz >> 2;
@@ -364,7 +370,7 @@ static void spi_qup_write(struct spi_qup *controller, 
			num_words = 1;

		}



		spi_qup_write_to_fifo(controller, xfer, num_words);

		spi_qup_write_to_fifo(controller, num_words);



		remainder -= num_words;
@@ -471,7 +477,31 @@ static int spi_qup_do_pio(struct spi_device *spi, struct spi_transfer *xfer, 
{

	struct spi_master *master = spi->master;

	struct spi_qup *qup = spi_master_get_devdata(master);

	int ret;

	int ret, n_words, iterations, offset = 0;



	n_words = qup->n_words;

	iterations = n_words / SPI_MAX_XFER; /* round down */

	qup->rx_buf = xfer->rx_buf;

	qup->tx_buf = xfer->tx_buf;



	do {

		if (iterations)

			qup->n_words = SPI_MAX_XFER;

		else

			qup->n_words = n_words % SPI_MAX_XFER;



		if (qup->tx_buf && offset)

			qup->tx_buf = xfer->tx_buf + offset * SPI_MAX_XFER;



		if (qup->rx_buf && offset)

			qup->rx_buf = xfer->rx_buf + offset * SPI_MAX_XFER;



		/*

		 * if the transaction is small enough, we need

		 * to fallback to FIFO mode

		 */

		if (qup->n_words <= (qup->in_fifo_sz / sizeof(u32)))

			qup->mode = QUP_IO_M_MODE_FIFO;



		ret = spi_qup_io_config(spi, xfer);

		if (ret)
@@ -490,25 +520,26 @@ static int spi_qup_do_pio(struct spi_device *spi, struct spi_transfer *xfer, 
		}



		if (qup->mode == QUP_IO_M_MODE_FIFO)

		spi_qup_write(qup, xfer);

			spi_qup_write(qup);



		ret = spi_qup_set_state(qup, QUP_STATE_RUN);

		if (ret) {

		dev_warn(qup->dev, "%s(%d): cannot set RUN state\n",

				__func__, __LINE__);

			dev_warn(qup->dev, "cannot set RUN state\n");

			return ret;

		}



		if (!wait_for_completion_timeout(&qup->done, timeout))

			return -ETIMEDOUT;



		offset++;

	} while (iterations--);



	return 0;

}



static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)

{

	struct spi_qup *controller = dev_id;

	struct spi_transfer *xfer = controller->xfer;

	u32 opflags, qup_err, spi_err;

	int error = 0;
@@ -545,10 +576,10 @@ static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id) 
		writel_relaxed(opflags, controller->base + QUP_OPERATIONAL);

	} else {

		if (opflags & QUP_OP_IN_SERVICE_FLAG)

			spi_qup_read(controller, xfer);

			spi_qup_read(controller);



		if (opflags & QUP_OP_OUT_SERVICE_FLAG)

			spi_qup_write(controller, xfer);

			spi_qup_write(controller);

	}



	if ((opflags & QUP_OP_MAX_INPUT_DONE_FLAG) || error)
@@ -755,7 +786,8 @@ static int spi_qup_transfer_one(struct spi_master *master, 
		return ret;



	timeout = DIV_ROUND_UP(xfer->speed_hz, MSEC_PER_SEC);

	timeout = DIV_ROUND_UP(xfer->len * 8, timeout);

	timeout = DIV_ROUND_UP(min_t(unsigned long, SPI_MAX_XFER,

				     xfer->len) * 8, timeout);

	timeout = 100 * msecs_to_jiffies(timeout);



	reinit_completion(&controller->done);
@@ -969,7 +1001,7 @@ static int spi_qup_probe(struct platform_device *pdev) 
	master->dev.of_node = pdev->dev.of_node;

	master->auto_runtime_pm = true;

	master->dma_alignment = dma_get_cache_alignment();

	master->max_dma_len = SPI_MAX_DMA_XFER;

	master->max_dma_len = SPI_MAX_XFER;



	platform_set_drvdata(pdev, master);

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