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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 <gsi@denx.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Gerhard Sittig 2013-06-03 14:03:49 +02:00 committed by Mark Brown
parent d683b96b07
commit c36e93a0bd
1 changed files with 19 additions and 24 deletions
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43
drivers/spi/spi-mpc512x-psc.c
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@ -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);