[4/4] spi: fsl-espi: remove unused linearization code

Commit Message

Heiner Kallweit Nov. 25, 2016, 11 p.m. UTC

After introducing direct transfers between hardware and transfer
buffers remove all code which is unused now.

This includes getting rid of the 64k linearization buffer.

Signed-off-by: Heiner Kallweit <[e-mail]>
---
 drivers/spi/spi-fsl-espi.c | 80 ----------------------------------------------
 1 file changed, 80 deletions(-)

Patch

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index e93892d..cd28329 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -95,9 +95,6 @@  struct fsl_espi {
 	struct device *dev;
 	void __iomem *reg_base;
 
-	const void *tx;
-	void *rx;
-
 	struct list_head *m_transfers;
 	struct spi_transfer *tx_t;
 	unsigned int tx_pos;
@@ -107,11 +104,8 @@  struct fsl_espi {
 	bool rx_done;
 
 	bool swab;
-	unsigned int rx_len;
-	unsigned int tx_len;
 	unsigned int rxskip;
 
-	u8 *local_buf;
 	spinlock_t lock;
 
 	u32 spibrg;             /* SPIBRG input clock */
@@ -156,61 +150,6 @@  static inline void fsl_espi_write_reg8(struct fsl_espi *espi, int offset,
 	iowrite8(val, espi->reg_base + offset);
 }
 
-static void fsl_espi_memcpy_swab(void *to, const void *from,
-				 struct spi_message *m,
-				 struct spi_transfer *t)
-{
-	struct fsl_espi *espi = spi_master_get_devdata(m->spi->master);
-	unsigned int len = t->len;
-
-	if (!espi->swab) {
-		memcpy(to, from, len);
-		return;
-	}
-
-	while (len)
-		if (len >= 4) {
-			*(u32 *)to = swahb32p(from);
-			to += 4;
-			from += 4;
-			len -= 4;
-		} else {
-			*(u16 *)to = swab16p(from);
-			to += 2;
-			from += 2;
-			len -= 2;
-		}
-}
-
-static void fsl_espi_copy_to_buf(struct spi_message *m,
-				 struct fsl_espi *espi)
-{
-	struct spi_transfer *t;
-	u8 *buf = espi->local_buf;
-
-	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf)
-			fsl_espi_memcpy_swab(buf, t->tx_buf, m, t);
-		/* In RXSKIP mode controller shifts out zeros internally */
-		else if (!espi->rxskip)
-			memset(buf, 0, t->len);
-		buf += t->len;
-	}
-}
-
-static void fsl_espi_copy_from_buf(struct spi_message *m,
-				   struct fsl_espi *espi)
-{
-	struct spi_transfer *t;
-	u8 *buf = espi->local_buf;
-
-	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->rx_buf)
-			fsl_espi_memcpy_swab(t->rx_buf, buf, m, t);
-		buf += t->len;
-	}
-}
-
 static int fsl_espi_check_message(struct spi_message *m)
 {
 	struct fsl_espi *espi = spi_master_get_devdata(m->spi->master);
@@ -421,12 +360,6 @@  static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	u32 mask, spcom;
 	int ret;
 
-	espi->rx_len = t->len;
-	espi->tx_len = t->len;
-
-	espi->tx = t->tx_buf;
-	espi->rx = t->rx_buf;
-
 	reinit_completion(&espi->done);
 
 	/* Set SPCOM[CS] and SPCOM[TRANLEN] field */
@@ -436,10 +369,7 @@  static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	/* configure RXSKIP mode */
 	if (espi->rxskip) {
 		spcom |= SPCOM_RXSKIP(espi->rxskip);
-		espi->tx_len = espi->rxskip;
-		espi->rx_len = t->len - espi->rxskip;
 		rx_len = t->len - espi->rxskip;
-		espi->rx = t->rx_buf + espi->rxskip;
 		if (t->rx_nbits == SPI_NBITS_DUAL)
 			spcom |= SPCOM_DO;
 	}
@@ -497,7 +427,6 @@  static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
 	if (espi->rxskip)
 		espi->rx_t = list_next_entry(espi->rx_t, transfer_list);
 
-	fsl_espi_copy_to_buf(m, espi);
 	fsl_espi_setup_transfer(spi, trans);
 
 	ret = fsl_espi_bufs(spi, trans);
@@ -511,7 +440,6 @@  static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
-	struct fsl_espi *espi = spi_master_get_devdata(m->spi->master);
 	unsigned int delay_usecs = 0, rx_nbits = 0;
 	struct spi_transfer *t, trans = {};
 	int ret;
@@ -534,8 +462,6 @@  static int fsl_espi_do_one_msg(struct spi_master *master,
 	trans.speed_hz = t->speed_hz;
 	trans.bits_per_word = t->bits_per_word;
 	trans.delay_usecs = delay_usecs;
-	trans.tx_buf = espi->local_buf;
-	trans.rx_buf = espi->local_buf;
 	trans.rx_nbits = rx_nbits;
 
 	if (trans.len)
@@ -773,12 +699,6 @@  static int fsl_espi_probe(struct device *dev, struct resource *mem,
 
 	init_completion(&espi->done);
 
-	espi->local_buf = devm_kmalloc(dev, SPCOM_TRANLEN_MAX, GFP_KERNEL);
-	if (!espi->local_buf) {
-		ret = -ENOMEM;
-		goto err_probe;
-	}
-
 	espi->reg_base = devm_ioremap_resource(dev, mem);
 	if (IS_ERR(espi->reg_base)) {
 		ret = PTR_ERR(espi->reg_base);