diff options
author | Bryan Wu <bryan.wu@analog.com> | 2007-05-21 18:32:16 +0800 |
---|---|---|
committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-21 09:50:24 -0700 |
commit | 88b4036934b5a6d8cda810487503d2fc4c46d448 (patch) | |
tree | c3924f200a7d823401678d5ab28d9fd6cc6a3361 /drivers/spi | |
parent | 2ac5ee4738cbd9c146ccda53f02006eaf6a43352 (diff) | |
download | kernel_samsung_smdk4412-88b4036934b5a6d8cda810487503d2fc4c46d448.zip kernel_samsung_smdk4412-88b4036934b5a6d8cda810487503d2fc4c46d448.tar.gz kernel_samsung_smdk4412-88b4036934b5a6d8cda810487503d2fc4c46d448.tar.bz2 |
Blackfin SPI: cleanup according to David Brownell's review
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@analog.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r-- | 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); |