From c36e93a0bdc7df31543a6950454dbd26b56c9015 Mon Sep 17 00:00:00 2001 From: Gerhard Sittig Date: Mon, 3 Jun 2013 14:03:49 +0200 Subject: spi: mpc512x: minor prep before feature change mechanical edits before changing functionality, to reduce diffs - rename variables to later tell remaining TX and RX apart - use size_t for the current TX and RX length (for better compatibility with the min() macro) - remove unused members from the master data (sysclk, eofbyte) - silence a checkpatch warning (braces around single statement) Signed-off-by: Gerhard Sittig Signed-off-by: Mark Brown --- drivers/spi/spi-mpc512x-psc.c | 43 +++++++++++++++++++------------------------ 1 file changed, 19 insertions(+), 24 deletions(-) (limited to 'drivers/spi/spi-mpc512x-psc.c') diff --git a/drivers/spi/spi-mpc512x-psc.c b/drivers/spi/spi-mpc512x-psc.c index dfddf33..759a937 100644 --- a/drivers/spi/spi-mpc512x-psc.c +++ b/drivers/spi/spi-mpc512x-psc.c @@ -33,7 +33,6 @@ struct mpc512x_psc_spi { void (*cs_control)(struct spi_device *spi, bool on); - u32 sysclk; /* driver internal data */ struct mpc52xx_psc __iomem *psc; @@ -42,7 +41,6 @@ struct mpc512x_psc_spi { u8 bits_per_word; u8 busy; u32 mclk; - u8 eofbyte; struct workqueue_struct *workqueue; struct work_struct work; @@ -50,7 +48,7 @@ struct mpc512x_psc_spi { struct list_head queue; spinlock_t lock; /* Message queue lock */ - struct completion done; + struct completion txisrdone; }; /* controller state */ @@ -138,7 +136,7 @@ static int mpc512x_psc_spi_transfer_rxtx(struct spi_device *spi, struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master); struct mpc52xx_psc __iomem *psc = mps->psc; struct mpc512x_psc_fifo __iomem *fifo = mps->fifo; - size_t len = t->len; + size_t tx_len = t->len; u8 *tx_buf = (u8 *)t->tx_buf; u8 *rx_buf = (u8 *)t->rx_buf; @@ -152,58 +150,57 @@ static int mpc512x_psc_spi_transfer_rxtx(struct spi_device *spi, /* enable transmiter/receiver */ out_8(&psc->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); - while (len) { - int count; + while (tx_len) { + size_t txcount; int i; u8 data; size_t fifosz; - int rxcount; + size_t rxcount; /* * The number of bytes that can be sent at a time * depends on the fifo size. */ fifosz = MPC512x_PSC_FIFO_SZ(in_be32(&fifo->txsz)); - count = min(fifosz, len); + txcount = min(fifosz, tx_len); - for (i = count; i > 0; i--) { + for (i = txcount; i > 0; i--) { data = tx_buf ? *tx_buf++ : 0; - if (len == EOFBYTE && t->cs_change) + if (tx_len == EOFBYTE && t->cs_change) setbits32(&fifo->txcmd, MPC512x_PSC_FIFO_EOF); out_8(&fifo->txdata_8, data); - len--; + tx_len--; } - INIT_COMPLETION(mps->done); + INIT_COMPLETION(mps->txisrdone); /* interrupt on tx fifo empty */ out_be32(&fifo->txisr, MPC512x_PSC_FIFO_EMPTY); out_be32(&fifo->tximr, MPC512x_PSC_FIFO_EMPTY); - wait_for_completion(&mps->done); + wait_for_completion(&mps->txisrdone); mdelay(1); - /* rx fifo should have count bytes in it */ + /* rx fifo should have txcount bytes in it */ rxcount = in_be32(&fifo->rxcnt); - if (rxcount != count) + if (rxcount != txcount) mdelay(1); rxcount = in_be32(&fifo->rxcnt); - if (rxcount != count) { + if (rxcount != txcount) { dev_warn(&spi->dev, "expected %d bytes in rx fifo " - "but got %d\n", count, rxcount); + "but got %d\n", txcount, rxcount); } - rxcount = min(rxcount, count); + rxcount = min(rxcount, txcount); for (i = rxcount; i > 0; i--) { data = in_8(&fifo->rxdata_8); if (rx_buf) *rx_buf++ = data; } - while (in_be32(&fifo->rxcnt)) { + while (in_be32(&fifo->rxcnt)) in_8(&fifo->rxdata_8); - } } /* disable transmiter/receiver and fifo interrupt */ out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE); @@ -412,7 +409,7 @@ static irqreturn_t mpc512x_psc_spi_isr(int irq, void *dev_id) in_be32(&fifo->tximr) & MPC512x_PSC_FIFO_EMPTY) { out_be32(&fifo->txisr, MPC512x_PSC_FIFO_EMPTY); out_be32(&fifo->tximr, 0); - complete(&mps->done); + complete(&mps->txisrdone); return IRQ_HANDLED; } return IRQ_NONE; @@ -444,11 +441,9 @@ static int mpc512x_psc_spi_do_probe(struct device *dev, u32 regaddr, if (pdata == NULL) { mps->cs_control = mpc512x_spi_cs_control; - mps->sysclk = 0; master->bus_num = bus_num; } else { mps->cs_control = pdata->cs_control; - mps->sysclk = pdata->sysclk; master->bus_num = pdata->bus_num; master->num_chipselect = pdata->max_chipselect; } @@ -479,7 +474,7 @@ static int mpc512x_psc_spi_do_probe(struct device *dev, u32 regaddr, goto free_irq; spin_lock_init(&mps->lock); - init_completion(&mps->done); + init_completion(&mps->txisrdone); INIT_WORK(&mps->work, mpc512x_psc_spi_work); INIT_LIST_HEAD(&mps->queue); -- cgit v1.1