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>

diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index ce3c0ce..7d2d9ec 100644 (file)
--- 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);