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Date: Mon, 21 May 2007 18:32:16 +0800
From: Bryan Wu <bryan.wu@...log.com>
To: torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
linux-kernel@...r.kernel.org, bryan.wu@...log.com
Subject: [PATCH 32/32] Blackfin SPI: cleanup according to David Brownell's
review
From: Bryan Wu <bryan.wu@...log.com>
a) platorm_driver_probe(...) instead of platform_driver_register(&driver);
b) set bfin_spi_enable and bfin_spi_disable static
c) Why is the width flag a u32?
d) maybe use dev_dbg() instead of pr_debug()
Signed-off-by: Bryan Wu <bryan.wu@...log.com>
---
drivers/spi/spi_bfin5xx.c | 152 ++++++++++++++++++++++++---------------------
1 files changed, 80 insertions(+), 72 deletions(-)
diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index ce3c0ce..7d2d9ec 100644
--- a/drivers/spi/spi_bfin5xx.c
+++ b/drivers/spi/spi_bfin5xx.c
@@ -126,7 +126,7 @@ struct chip_data {
u8 chip_select_num;
u8 n_bytes;
- u32 width; /* 0 or 1 */
+ u8 width; /* 0 or 1 */
u8 enable_dma;
u8 bits_per_word; /* 8 or 16 */
u8 cs_change_per_word;
@@ -136,7 +136,7 @@ struct chip_data {
void (*duplex) (struct driver_data *);
};
-void bfin_spi_enable(struct driver_data *drv_data)
+static void bfin_spi_enable(struct driver_data *drv_data)
{
u16 cr;
@@ -145,7 +145,7 @@ void bfin_spi_enable(struct driver_data *drv_data)
SSYNC();
}
-void bfin_spi_disable(struct driver_data *drv_data)
+static void bfin_spi_disable(struct driver_data *drv_data)
{
u16 cr;
@@ -163,9 +163,6 @@ static u16 hz_to_spi_baud(u32 speed_hz)
if ((sclk % (2 * speed_hz)) > 0)
spi_baud++;
- pr_debug("sclk = %ld, speed_hz = %d, spi_baud = %d\n", sclk, speed_hz,
- spi_baud);
-
return spi_baud;
}
@@ -190,11 +187,12 @@ static void restore_state(struct driver_data *drv_data)
/* Clear status and disable clock */
write_STAT(BIT_STAT_CLR);
bfin_spi_disable(drv_data);
- pr_debug("restoring spi ctl state\n");
+ dev_dbg(&drv_data->pdev->dev, "restoring spi ctl state\n");
#if defined(CONFIG_BF534) || defined(CONFIG_BF536) || defined(CONFIG_BF537)
- pr_debug("chip select number is %d\n", chip->chip_select_num);
-
+ dev_dbg(&drv_data->pdev->dev,
+ "chip select number is %d\n", chip->chip_select_num);
+
switch (chip->chip_select_num) {
case 1:
bfin_write_PORTF_FER(bfin_read_PORTF_FER() | 0x3c00);
@@ -280,7 +278,8 @@ static void null_reader(struct driver_data *drv_data)
static void u8_writer(struct driver_data *drv_data)
{
- pr_debug("cr8-s is 0x%x\n", read_STAT());
+ dev_dbg(&drv_data->pdev->dev,
+ "cr8-s is 0x%x\n", read_STAT());
while (drv_data->tx < drv_data->tx_end) {
write_TDBR(*(u8 *) (drv_data->tx));
while (read_STAT() & BIT_STAT_TXS)
@@ -318,7 +317,8 @@ static void u8_cs_chg_writer(struct driver_data *drv_data)
static void u8_reader(struct driver_data *drv_data)
{
- pr_debug("cr-8 is 0x%x\n", read_STAT());
+ dev_dbg(&drv_data->pdev->dev,
+ "cr-8 is 0x%x\n", read_STAT());
/* clear TDBR buffer before read(else it will be shifted out) */
write_TDBR(0xFFFF);
@@ -404,7 +404,9 @@ static void u8_cs_chg_duplex(struct driver_data *drv_data)
static void u16_writer(struct driver_data *drv_data)
{
- pr_debug("cr16 is 0x%x\n", read_STAT());
+ dev_dbg(&drv_data->pdev->dev,
+ "cr16 is 0x%x\n", read_STAT());
+
while (drv_data->tx < drv_data->tx_end) {
write_TDBR(*(u16 *) (drv_data->tx));
while ((read_STAT() & BIT_STAT_TXS))
@@ -442,7 +444,8 @@ static void u16_cs_chg_writer(struct driver_data *drv_data)
static void u16_reader(struct driver_data *drv_data)
{
- pr_debug("cr-16 is 0x%x\n", read_STAT());
+ dev_dbg(&drv_data->pdev->dev,
+ "cr-16 is 0x%x\n", read_STAT());
dummy_read();
while (drv_data->rx < (drv_data->rx_end - 2)) {
@@ -571,12 +574,12 @@ static void giveback(struct driver_data *drv_data)
msg->complete(msg->context);
}
-static irqreturn_t dma_irq_handler(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t dma_irq_handler(int irq, void *dev_id)
{
struct driver_data *drv_data = (struct driver_data *)dev_id;
struct spi_message *msg = drv_data->cur_msg;
- pr_debug("in dma_irq_handler\n");
+ dev_dbg(&drv_data->pdev->dev, "in dma_irq_handler\n");
clear_dma_irqstat(CH_SPI);
/*
@@ -604,7 +607,9 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id, struct pt_regs *regs)
tasklet_schedule(&drv_data->pump_transfers);
/* free the irq handler before next transfer */
- pr_debug("disable dma channel irq%d\n", CH_SPI);
+ dev_dbg(&drv_data->pdev->dev,
+ "disable dma channel irq%d\n",
+ CH_SPI);
dma_disable_irq(CH_SPI);
return IRQ_HANDLED;
@@ -617,7 +622,8 @@ static void pump_transfers(unsigned long data)
struct spi_transfer *transfer = NULL;
struct spi_transfer *previous = NULL;
struct chip_data *chip = NULL;
- u16 cr, width, dma_width, dma_config;
+ u8 width;
+ u16 cr, dma_width, dma_config;
u32 tranf_success = 1;
/* Get current state information */
@@ -662,8 +668,8 @@ static void pump_transfers(unsigned long data)
if (transfer->tx_buf != NULL) {
drv_data->tx = (void *)transfer->tx_buf;
drv_data->tx_end = drv_data->tx + transfer->len;
- pr_debug("tx_buf is %p, tx_end is %p\n", transfer->tx_buf,
- drv_data->tx_end);
+ dev_dbg(&drv_data->pdev->dev, "tx_buf is %p, tx_end is %p\n",
+ transfer->tx_buf, drv_data->tx_end);
} else {
drv_data->tx = NULL;
}
@@ -671,8 +677,8 @@ static void pump_transfers(unsigned long data)
if (transfer->rx_buf != NULL) {
drv_data->rx = transfer->rx_buf;
drv_data->rx_end = drv_data->rx + transfer->len;
- pr_debug("rx_buf is %p, rx_end is %p\n", transfer->rx_buf,
- drv_data->rx_end);
+ dev_dbg(&drv_data->pdev->dev, "rx_buf is %p, rx_end is %p\n",
+ transfer->rx_buf, drv_data->rx_end);
} else {
drv_data->rx = NULL;
}
@@ -690,9 +696,9 @@ static void pump_transfers(unsigned long data)
drv_data->write = drv_data->tx ? chip->write : null_writer;
drv_data->read = drv_data->rx ? chip->read : null_reader;
drv_data->duplex = chip->duplex ? chip->duplex : null_writer;
- pr_debug
- ("transfer: drv_data->write is %p, chip->write is %p, null_wr is %p\n",
- drv_data->write, chip->write, null_writer);
+ dev_dbg(&drv_data->pdev->dev,
+ "transfer: drv_data->write is %p, chip->write is %p, null_wr is %p\n",
+ drv_data->write, chip->write, null_writer);
/* speed and width has been set on per message */
message->state = RUNNING_STATE;
@@ -706,8 +712,9 @@ static void pump_transfers(unsigned long data)
}
write_FLAG(chip->flag);
- pr_debug("now pumping a transfer: width is %d, len is %d\n", width,
- transfer->len);
+ dev_dbg(&drv_data->pdev->dev,
+ "now pumping a transfer: width is %d, len is %d\n",
+ width, transfer->len);
/*
* Try to map dma buffer and do a dma transfer if
@@ -722,7 +729,7 @@ static void pump_transfers(unsigned long data)
bfin_spi_disable(drv_data);
/* config dma channel */
- pr_debug("doing dma transfer\n");
+ dev_dbg(&drv_data->pdev->dev, "doing dma transfer\n");
if (width == CFG_SPI_WORDSIZE16) {
set_dma_x_count(CH_SPI, drv_data->len);
set_dma_x_modify(CH_SPI, 2);
@@ -738,7 +745,8 @@ static void pump_transfers(unsigned long data)
/* dirty hack for autobuffer DMA mode */
if (drv_data->tx_dma == 0xFFFF) {
- pr_debug("doing autobuffer DMA out.\n");
+ dev_dbg(&drv_data->pdev->dev,
+ "doing autobuffer DMA out.\n");
/* no irq in autobuffer mode */
dma_config =
@@ -758,7 +766,7 @@ static void pump_transfers(unsigned long data)
/* In dma mode, rx or tx must be NULL in one transfer */
if (drv_data->rx != NULL) {
/* set transfer mode, and enable SPI */
- pr_debug("doing DMA in.\n");
+ dev_dbg(&drv_data->pdev->dev, "doing DMA in.\n");
/* disable SPI before write to TDBR */
write_CTRL(cr & ~BIT_CTL_ENABLE);
@@ -781,7 +789,7 @@ static void pump_transfers(unsigned long data)
/* set transfer mode, and enable SPI */
write_CTRL(cr);
} else if (drv_data->tx != NULL) {
- pr_debug("doing DMA out.\n");
+ dev_dbg(&drv_data->pdev->dev, "doing DMA out.\n");
/* start dma */
dma_enable_irq(CH_SPI);
@@ -796,7 +804,7 @@ static void pump_transfers(unsigned long data)
}
} else {
/* IO mode write then read */
- pr_debug("doing IO transfer\n");
+ dev_dbg(&drv_data->pdev->dev, "doing IO transfer\n");
write_STAT(BIT_STAT_CLR);
@@ -804,11 +812,11 @@ static void pump_transfers(unsigned long data)
/* full duplex mode */
BUG_ON((drv_data->tx_end - drv_data->tx) !=
(drv_data->rx_end - drv_data->rx));
- cr = (read_CTRL() & (~BIT_CTL_TIMOD)); /* clear the TIMOD bits */
- cr |=
- CFG_SPI_WRITE | (width << 8) | (CFG_SPI_ENABLE <<
- 14);
- pr_debug("IO duplex: cr is 0x%x\n", cr);
+ cr = (read_CTRL() & (~BIT_CTL_TIMOD));
+ cr |= CFG_SPI_WRITE | (width << 8) |
+ (CFG_SPI_ENABLE << 14);
+ dev_dbg(&drv_data->pdev->dev,
+ "IO duplex: cr is 0x%x\n", cr);
write_CTRL(cr);
SSYNC();
@@ -819,11 +827,11 @@ static void pump_transfers(unsigned long data)
tranf_success = 0;
} else if (drv_data->tx != NULL) {
/* write only half duplex */
- cr = (read_CTRL() & (~BIT_CTL_TIMOD)); /* clear the TIMOD bits */
- cr |=
- CFG_SPI_WRITE | (width << 8) | (CFG_SPI_ENABLE <<
- 14);
- pr_debug("IO write: cr is 0x%x\n", cr);
+ cr = (read_CTRL() & (~BIT_CTL_TIMOD));
+ cr |= CFG_SPI_WRITE | (width << 8) |
+ (CFG_SPI_ENABLE << 14);
+ dev_dbg(&drv_data->pdev->dev,
+ "IO write: cr is 0x%x\n", cr);
write_CTRL(cr);
SSYNC();
@@ -834,11 +842,11 @@ static void pump_transfers(unsigned long data)
tranf_success = 0;
} else if (drv_data->rx != NULL) {
/* read only half duplex */
- cr = (read_CTRL() & (~BIT_CTL_TIMOD)); /* cleare the TIMOD bits */
- cr |=
- CFG_SPI_READ | (width << 8) | (CFG_SPI_ENABLE <<
- 14);
- pr_debug("IO read: cr is 0x%x\n", cr);
+ cr = (read_CTRL() & (~BIT_CTL_TIMOD));
+ cr |= CFG_SPI_READ | (width << 8) |
+ (CFG_SPI_ENABLE << 14);
+ dev_dbg(&drv_data->pdev->dev,
+ "IO read: cr is 0x%x\n", cr);
write_CTRL(cr);
SSYNC();
@@ -849,7 +857,8 @@ static void pump_transfers(unsigned long data)
}
if (!tranf_success) {
- pr_debug("IO write error!\n");
+ dev_dbg(&drv_data->pdev->dev,
+ "IO write error!\n");
message->state = ERROR_STATE;
} else {
/* Update total byte transfered */
@@ -899,11 +908,14 @@ static void pump_messages(struct work_struct *work)
/* Setup the SSP using the per chip configuration */
drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi);
restore_state(drv_data);
- pr_debug
- ("got a message to pump, state is set to: baud %d, flag 0x%x, ctl 0x%x\n",
- drv_data->cur_chip->baud, drv_data->cur_chip->flag,
- drv_data->cur_chip->ctl_reg);
- pr_debug("the first transfer len is %d\n", drv_data->cur_transfer->len);
+ dev_dbg(&drv_data->pdev->dev,
+ "got a message to pump, state is set to: baud %d, flag 0x%x, ctl 0x%x\n",
+ drv_data->cur_chip->baud, drv_data->cur_chip->flag,
+ drv_data->cur_chip->ctl_reg);
+
+ dev_dbg(&drv_data->pdev->dev,
+ "the first transfer len is %d\n",
+ drv_data->cur_transfer->len);
/* Mark as busy and launch transfers */
tasklet_schedule(&drv_data->pump_transfers);
@@ -932,7 +944,7 @@ static int transfer(struct spi_device *spi, struct spi_message *msg)
msg->status = -EINPROGRESS;
msg->state = START_STATE;
- pr_debug("adding an msg in transfer() \n");
+ dev_dbg(&spi->dev, "adding an msg in transfer() \n");
list_add_tail(&msg->queue, &drv_data->queue);
if (drv_data->run == QUEUE_RUNNING && !drv_data->busy)
@@ -1002,13 +1014,13 @@ static int setup(struct spi_device *spi)
if (chip->enable_dma && !dma_requested) {
/* register dma irq handler */
if (request_dma(CH_SPI, "BF53x_SPI_DMA") < 0) {
- pr_debug
- ("Unable to request BlackFin SPI DMA channel\n");
+ dev_dbg(&spi->dev,
+ "Unable to request BlackFin SPI DMA channel\n");
return -ENODEV;
}
if (set_dma_callback(CH_SPI, (void *)dma_irq_handler, drv_data)
< 0) {
- pr_debug("Unable to set dma callback\n");
+ dev_dbg(&spi->dev, "Unable to set dma callback\n");
return -EPERM;
}
dma_disable_irq(CH_SPI);
@@ -1054,9 +1066,9 @@ static int setup(struct spi_device *spi)
return -ENODEV;
}
- pr_debug("setup spi chip %s, width is %d, dma is %d,",
+ dev_dbg(&spi->dev, "setup spi chip %s, width is %d, dma is %d,",
spi->modalias, chip->width, chip->enable_dma);
- pr_debug("ctl_reg is 0x%x, flag_reg is 0x%x\n",
+ dev_dbg(&spi->dev, "ctl_reg is 0x%x, flag_reg is 0x%x\n",
chip->ctl_reg, chip->flag);
spi_set_ctldata(spi, chip);
@@ -1068,7 +1080,7 @@ static int setup(struct spi_device *spi)
* callback for spi framework.
* clean driver specific data
*/
-static void cleanup(const struct spi_device *spi)
+static void cleanup(struct spi_device *spi)
{
struct chip_data *chip = spi_get_ctldata((struct spi_device *)spi);
@@ -1207,7 +1219,7 @@ static int __init bfin5xx_spi_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "problem registering spi master\n");
goto out_error_queue_alloc;
}
- pr_debug("controller probe successfully\n");
+ dev_dbg(&pdev->dev, "controller probe successfully\n");
return status;
out_error_queue_alloc:
@@ -1287,27 +1299,23 @@ static int bfin5xx_spi_resume(struct platform_device *pdev)
#endif /* CONFIG_PM */
static struct platform_driver bfin5xx_spi_driver = {
- .driver = {
- .name = "bfin-spi-master",
- .bus = &platform_bus_type,
- .owner = THIS_MODULE,
- },
- .probe = bfin5xx_spi_probe,
- .remove = __devexit_p(bfin5xx_spi_remove),
- .suspend = bfin5xx_spi_suspend,
- .resume = bfin5xx_spi_resume,
+ .driver = {
+ .name = "bfin-spi-master",
+ .owner = THIS_MODULE,
+ },
+ .suspend = bfin5xx_spi_suspend,
+ .resume = bfin5xx_spi_resume,
+ .remove = __devexit_p(bfin5xx_spi_remove),
};
static int __init bfin5xx_spi_init(void)
{
- return platform_driver_register(&bfin5xx_spi_driver);
+ return platform_driver_probe(&bfin5xx_spi_driver, bfin5xx_spi_probe);
}
-
module_init(bfin5xx_spi_init);
static void __exit bfin5xx_spi_exit(void)
{
platform_driver_unregister(&bfin5xx_spi_driver);
}
-
module_exit(bfin5xx_spi_exit);
--
1.5.1.2
-
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