diff options
Diffstat (limited to 'drivers/spi/spi_bfin5xx.c')
-rw-r--r-- | drivers/spi/spi_bfin5xx.c | 131 |
1 files changed, 32 insertions, 99 deletions
diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c index 7ef39a6..d853fceb 100644 --- a/drivers/spi/spi_bfin5xx.c +++ b/drivers/spi/spi_bfin5xx.c @@ -1,37 +1,11 @@ /* - * File: drivers/spi/bfin5xx_spi.c - * Maintainer: - * Bryan Wu <bryan.wu@analog.com> - * Original Author: - * Luke Yang (Analog Devices Inc.) - * - * Created: March. 10th 2006 - * Description: SPI controller driver for Blackfin BF5xx - * Bugs: Enter bugs at http://blackfin.uclinux.org/ - * - * Modified: - * March 10, 2006 bfin5xx_spi.c Created. (Luke Yang) - * August 7, 2006 added full duplex mode (Axel Weiss & Luke Yang) - * July 17, 2007 add support for BF54x SPI0 controller (Bryan Wu) - * July 30, 2007 add platfrom_resource interface to support multi-port - * SPI controller (Bryan Wu) + * Blackfin On-Chip SPI Driver * * Copyright 2004-2007 Analog Devices Inc. * - * This program is free software ; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation ; either version 2, or (at your option) - * any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY ; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. + * Enter bugs at http://blackfin.uclinux.org/ * - * You should have received a copy of the GNU General Public License - * along with this program ; see the file COPYING. - * If not, write to the Free Software Foundation, - * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * Licensed under the GPL-2 or later. */ #include <linux/init.h> @@ -223,10 +197,9 @@ static void cs_deactive(struct driver_data *drv_data, struct chip_data *chip) #define MAX_SPI_SSEL 7 /* stop controller and re-config current chip*/ -static int restore_state(struct driver_data *drv_data) +static void restore_state(struct driver_data *drv_data) { struct chip_data *chip = drv_data->cur_chip; - int ret = 0; /* Clear status and disable clock */ write_STAT(drv_data, BIT_STAT_CLR); @@ -239,13 +212,6 @@ static int restore_state(struct driver_data *drv_data) bfin_spi_enable(drv_data); cs_active(drv_data, chip); - - if (ret) - dev_dbg(&drv_data->pdev->dev, - ": request chip select number %d failed\n", - chip->chip_select_num); - - return ret; } /* used to kick off transfer in rx mode */ @@ -286,32 +252,30 @@ static void u8_writer(struct driver_data *drv_data) dev_dbg(&drv_data->pdev->dev, "cr8-s is 0x%x\n", read_STAT(drv_data)); - /* poll for SPI completion before start */ - while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) - cpu_relax(); - while (drv_data->tx < drv_data->tx_end) { write_TDBR(drv_data, (*(u8 *) (drv_data->tx))); while (read_STAT(drv_data) & BIT_STAT_TXS) cpu_relax(); ++drv_data->tx; } + + /* poll for SPI completion before return */ + while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) + cpu_relax(); } static void u8_cs_chg_writer(struct driver_data *drv_data) { struct chip_data *chip = drv_data->cur_chip; - /* poll for SPI completion before start */ - while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) - cpu_relax(); - while (drv_data->tx < drv_data->tx_end) { cs_active(drv_data, chip); write_TDBR(drv_data, (*(u8 *) (drv_data->tx))); while (read_STAT(drv_data) & BIT_STAT_TXS) cpu_relax(); + while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) + cpu_relax(); cs_deactive(drv_data, chip); @@ -350,43 +314,28 @@ static void u8_cs_chg_reader(struct driver_data *drv_data) { struct chip_data *chip = drv_data->cur_chip; - /* poll for SPI completion before start */ - while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) - cpu_relax(); - - /* clear TDBR buffer before read(else it will be shifted out) */ - write_TDBR(drv_data, 0xFFFF); + while (drv_data->rx < drv_data->rx_end) { + cs_active(drv_data, chip); + read_RDBR(drv_data); /* kick off */ - cs_active(drv_data, chip); - dummy_read(drv_data); + while (!(read_STAT(drv_data) & BIT_STAT_RXS)) + cpu_relax(); + while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) + cpu_relax(); - while (drv_data->rx < drv_data->rx_end - 1) { + *(u8 *) (drv_data->rx) = read_SHAW(drv_data); cs_deactive(drv_data, chip); - while (!(read_STAT(drv_data) & BIT_STAT_RXS)) - cpu_relax(); - cs_active(drv_data, chip); - *(u8 *) (drv_data->rx) = read_RDBR(drv_data); ++drv_data->rx; } - cs_deactive(drv_data, chip); - - while (!(read_STAT(drv_data) & BIT_STAT_RXS)) - cpu_relax(); - *(u8 *) (drv_data->rx) = read_SHAW(drv_data); - ++drv_data->rx; } static void u8_duplex(struct driver_data *drv_data) { - /* poll for SPI completion before start */ - while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) - cpu_relax(); - /* in duplex mode, clk is triggered by writing of TDBR */ while (drv_data->rx < drv_data->rx_end) { write_TDBR(drv_data, (*(u8 *) (drv_data->tx))); - while (read_STAT(drv_data) & BIT_STAT_TXS) + while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) cpu_relax(); while (!(read_STAT(drv_data) & BIT_STAT_RXS)) cpu_relax(); @@ -400,15 +349,12 @@ static void u8_cs_chg_duplex(struct driver_data *drv_data) { struct chip_data *chip = drv_data->cur_chip; - /* poll for SPI completion before start */ - while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) - cpu_relax(); - while (drv_data->rx < drv_data->rx_end) { cs_active(drv_data, chip); write_TDBR(drv_data, (*(u8 *) (drv_data->tx))); - while (read_STAT(drv_data) & BIT_STAT_TXS) + + while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) cpu_relax(); while (!(read_STAT(drv_data) & BIT_STAT_RXS)) cpu_relax(); @@ -426,32 +372,30 @@ static void u16_writer(struct driver_data *drv_data) dev_dbg(&drv_data->pdev->dev, "cr16 is 0x%x\n", read_STAT(drv_data)); - /* poll for SPI completion before start */ - while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) - cpu_relax(); - while (drv_data->tx < drv_data->tx_end) { write_TDBR(drv_data, (*(u16 *) (drv_data->tx))); while ((read_STAT(drv_data) & BIT_STAT_TXS)) cpu_relax(); drv_data->tx += 2; } + + /* poll for SPI completion before return */ + while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) + cpu_relax(); } static void u16_cs_chg_writer(struct driver_data *drv_data) { struct chip_data *chip = drv_data->cur_chip; - /* poll for SPI completion before start */ - while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) - cpu_relax(); - while (drv_data->tx < drv_data->tx_end) { cs_active(drv_data, chip); write_TDBR(drv_data, (*(u16 *) (drv_data->tx))); while ((read_STAT(drv_data) & BIT_STAT_TXS)) cpu_relax(); + while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) + cpu_relax(); cs_deactive(drv_data, chip); @@ -519,14 +463,10 @@ static void u16_cs_chg_reader(struct driver_data *drv_data) static void u16_duplex(struct driver_data *drv_data) { - /* poll for SPI completion before start */ - while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) - cpu_relax(); - /* in duplex mode, clk is triggered by writing of TDBR */ while (drv_data->tx < drv_data->tx_end) { write_TDBR(drv_data, (*(u16 *) (drv_data->tx))); - while (read_STAT(drv_data) & BIT_STAT_TXS) + while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) cpu_relax(); while (!(read_STAT(drv_data) & BIT_STAT_RXS)) cpu_relax(); @@ -540,15 +480,11 @@ static void u16_cs_chg_duplex(struct driver_data *drv_data) { struct chip_data *chip = drv_data->cur_chip; - /* poll for SPI completion before start */ - while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) - cpu_relax(); - while (drv_data->tx < drv_data->tx_end) { cs_active(drv_data, chip); write_TDBR(drv_data, (*(u16 *) (drv_data->tx))); - while (read_STAT(drv_data) & BIT_STAT_TXS) + while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) cpu_relax(); while (!(read_STAT(drv_data) & BIT_STAT_RXS)) cpu_relax(); @@ -616,7 +552,7 @@ static void giveback(struct driver_data *drv_data) static irqreturn_t dma_irq_handler(int irq, void *dev_id) { - struct driver_data *drv_data = (struct driver_data *)dev_id; + struct driver_data *drv_data = dev_id; struct chip_data *chip = drv_data->cur_chip; struct spi_message *msg = drv_data->cur_msg; @@ -978,10 +914,7 @@ 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); - if (restore_state(drv_data)) { - spin_unlock_irqrestore(&drv_data->lock, flags); - return; - }; + restore_state(drv_data); list_del_init(&drv_data->cur_msg->queue); @@ -1187,7 +1120,7 @@ static int setup(struct spi_device *spi) if ((chip->chip_select_num > 0) && (chip->chip_select_num <= spi->master->num_chipselect)) peripheral_request(ssel[spi->master->bus_num] - [chip->chip_select_num-1], DRV_NAME); + [chip->chip_select_num-1], spi->modalias); cs_deactive(drv_data, chip); |