Blackfin SPI Driver: Make mmc_spi driver work on Blackfin
1. Rewrite of the non-dma data transfer functions to use only ONE mode of TIMOD (TIMOD=0x1). With TIMOD=0, it was not possible to set the TX bit pattern. So the TDBR = 0xFFFF inside the read calls won't work. 2. Clear SPI_RDBR before reading and before duplex transfer. Otherwise the garbage data in RDBR will get read. Since mmc_spi uses a lot of duplex transfers, this is the main cause of mmc_spi failure. 3. Poll RXS for transfer completion. Polling SPIF or TXS cannot guarantee transfer completion. This may interrupt a transfer before it is finished. Also this may leave garbage data in buffer and affect next transfer. [Yi Li <yi.li@analog.com>: add a field "u16 idle_tx_val" in "struct bfin5xx_spi_chip" to specify the value to transmit if no TX value is supplied.] Signed-off-by: Wolfgang Muees <wolfgang.mues@auerswald.de> Signed-off-by: Yi Li <yi.li@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wolfgang Muees
Linus Torvalds
parent
42c78b2bf5
commit
93b61bddc1
@ -125,6 +125,8 @@ struct bfin5xx_spi_chip {
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u8 cs_change_per_word;
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u16 cs_chg_udelay; /* Some devices require 16-bit delays */
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u32 cs_gpio;
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/* Value to send if no TX value is supplied, usually 0x0 or 0xFFFF */
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u16 idle_tx_val;
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};
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#endif /* _SPI_CHANNEL_H_ */
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@ -45,6 +45,9 @@ MODULE_LICENSE("GPL");
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#define QUEUE_RUNNING 0
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#define QUEUE_STOPPED 1
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/* Value to send if no TX value is supplied */
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#define SPI_IDLE_TXVAL 0x0000
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struct driver_data {
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/* Driver model hookup */
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struct platform_device *pdev;
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@ -112,6 +115,7 @@ struct chip_data {
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u8 cs_change_per_word;
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u16 cs_chg_udelay; /* Some devices require > 255usec delay */
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u32 cs_gpio;
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u16 idle_tx_val;
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void (*write) (struct driver_data *);
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void (*read) (struct driver_data *);
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void (*duplex) (struct driver_data *);
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@ -226,134 +230,126 @@ static void bfin_spi_restore_state(struct driver_data *drv_data)
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bfin_spi_cs_active(drv_data, chip);
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}
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/* used to kick off transfer in rx mode */
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static unsigned short bfin_spi_dummy_read(struct driver_data *drv_data)
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/* used to kick off transfer in rx mode and read unwanted RX data */
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static inline void bfin_spi_dummy_read(struct driver_data *drv_data)
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{
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unsigned short tmp;
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tmp = read_RDBR(drv_data);
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return tmp;
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(void) read_RDBR(drv_data);
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}
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static void bfin_spi_null_writer(struct driver_data *drv_data)
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{
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u8 n_bytes = drv_data->n_bytes;
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u16 tx_val = drv_data->cur_chip->idle_tx_val;
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/* clear RXS (we check for RXS inside the loop) */
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bfin_spi_dummy_read(drv_data);
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while (drv_data->tx < drv_data->tx_end) {
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write_TDBR(drv_data, 0);
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while ((read_STAT(drv_data) & BIT_STAT_TXS))
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cpu_relax();
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write_TDBR(drv_data, tx_val);
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drv_data->tx += n_bytes;
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/* wait until transfer finished.
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checking SPIF or TXS may not guarantee transfer completion */
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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cpu_relax();
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/* discard RX data and clear RXS */
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bfin_spi_dummy_read(drv_data);
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}
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}
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static void bfin_spi_null_reader(struct driver_data *drv_data)
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{
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u8 n_bytes = drv_data->n_bytes;
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u16 tx_val = drv_data->cur_chip->idle_tx_val;
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/* discard old RX data and clear RXS */
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bfin_spi_dummy_read(drv_data);
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while (drv_data->rx < drv_data->rx_end) {
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write_TDBR(drv_data, tx_val);
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drv_data->rx += n_bytes;
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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cpu_relax();
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bfin_spi_dummy_read(drv_data);
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drv_data->rx += n_bytes;
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}
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}
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static void bfin_spi_u8_writer(struct driver_data *drv_data)
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{
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dev_dbg(&drv_data->pdev->dev,
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"cr8-s is 0x%x\n", read_STAT(drv_data));
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/* clear RXS (we check for RXS inside the loop) */
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bfin_spi_dummy_read(drv_data);
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while (drv_data->tx < drv_data->tx_end) {
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write_TDBR(drv_data, (*(u8 *) (drv_data->tx)));
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while (read_STAT(drv_data) & BIT_STAT_TXS)
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write_TDBR(drv_data, (*(u8 *) (drv_data->tx++)));
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/* wait until transfer finished.
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checking SPIF or TXS may not guarantee transfer completion */
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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cpu_relax();
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++drv_data->tx;
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/* discard RX data and clear RXS */
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bfin_spi_dummy_read(drv_data);
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}
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/* poll for SPI completion before return */
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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cpu_relax();
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}
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static void bfin_spi_u8_cs_chg_writer(struct driver_data *drv_data)
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{
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struct chip_data *chip = drv_data->cur_chip;
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/* clear RXS (we check for RXS inside the loop) */
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bfin_spi_dummy_read(drv_data);
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while (drv_data->tx < drv_data->tx_end) {
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bfin_spi_cs_active(drv_data, chip);
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write_TDBR(drv_data, (*(u8 *) (drv_data->tx)));
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while (read_STAT(drv_data) & BIT_STAT_TXS)
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write_TDBR(drv_data, (*(u8 *) (drv_data->tx++)));
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/* make sure transfer finished before deactiving CS */
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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cpu_relax();
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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cpu_relax();
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bfin_spi_dummy_read(drv_data);
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bfin_spi_cs_deactive(drv_data, chip);
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++drv_data->tx;
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}
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}
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static void bfin_spi_u8_reader(struct driver_data *drv_data)
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{
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dev_dbg(&drv_data->pdev->dev,
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"cr-8 is 0x%x\n", read_STAT(drv_data));
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/* poll for SPI completion before start */
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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cpu_relax();
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/* clear TDBR buffer before read(else it will be shifted out) */
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write_TDBR(drv_data, 0xFFFF);
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u16 tx_val = drv_data->cur_chip->idle_tx_val;
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/* discard old RX data and clear RXS */
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bfin_spi_dummy_read(drv_data);
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while (drv_data->rx < drv_data->rx_end - 1) {
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while (drv_data->rx < drv_data->rx_end) {
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write_TDBR(drv_data, tx_val);
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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cpu_relax();
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*(u8 *) (drv_data->rx) = read_RDBR(drv_data);
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++drv_data->rx;
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*(u8 *) (drv_data->rx++) = read_RDBR(drv_data);
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}
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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cpu_relax();
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*(u8 *) (drv_data->rx) = read_SHAW(drv_data);
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++drv_data->rx;
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}
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static void bfin_spi_u8_cs_chg_reader(struct driver_data *drv_data)
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{
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struct chip_data *chip = drv_data->cur_chip;
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u16 tx_val = chip->idle_tx_val;
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/* discard old RX data and clear RXS */
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bfin_spi_dummy_read(drv_data);
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while (drv_data->rx < drv_data->rx_end) {
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bfin_spi_cs_active(drv_data, chip);
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read_RDBR(drv_data); /* kick off */
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write_TDBR(drv_data, tx_val);
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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cpu_relax();
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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cpu_relax();
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*(u8 *) (drv_data->rx) = read_SHAW(drv_data);
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*(u8 *) (drv_data->rx++) = read_RDBR(drv_data);
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bfin_spi_cs_deactive(drv_data, chip);
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++drv_data->rx;
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}
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}
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static void bfin_spi_u8_duplex(struct driver_data *drv_data)
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{
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/* in duplex mode, clk is triggered by writing of TDBR */
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/* discard old RX data and clear RXS */
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bfin_spi_dummy_read(drv_data);
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while (drv_data->rx < drv_data->rx_end) {
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write_TDBR(drv_data, (*(u8 *) (drv_data->tx)));
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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cpu_relax();
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write_TDBR(drv_data, (*(u8 *) (drv_data->tx++)));
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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cpu_relax();
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*(u8 *) (drv_data->rx) = read_RDBR(drv_data);
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++drv_data->rx;
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++drv_data->tx;
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*(u8 *) (drv_data->rx++) = read_RDBR(drv_data);
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}
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}
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@ -361,130 +357,102 @@ static void bfin_spi_u8_cs_chg_duplex(struct driver_data *drv_data)
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{
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struct chip_data *chip = drv_data->cur_chip;
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/* discard old RX data and clear RXS */
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bfin_spi_dummy_read(drv_data);
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while (drv_data->rx < drv_data->rx_end) {
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bfin_spi_cs_active(drv_data, chip);
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write_TDBR(drv_data, (*(u8 *) (drv_data->tx)));
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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cpu_relax();
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write_TDBR(drv_data, (*(u8 *) (drv_data->tx++)));
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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cpu_relax();
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*(u8 *) (drv_data->rx) = read_RDBR(drv_data);
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*(u8 *) (drv_data->rx++) = read_RDBR(drv_data);
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bfin_spi_cs_deactive(drv_data, chip);
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++drv_data->rx;
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++drv_data->tx;
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}
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}
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static void bfin_spi_u16_writer(struct driver_data *drv_data)
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{
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dev_dbg(&drv_data->pdev->dev,
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"cr16 is 0x%x\n", read_STAT(drv_data));
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/* clear RXS (we check for RXS inside the loop) */
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bfin_spi_dummy_read(drv_data);
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while (drv_data->tx < drv_data->tx_end) {
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write_TDBR(drv_data, (*(u16 *) (drv_data->tx)));
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while ((read_STAT(drv_data) & BIT_STAT_TXS))
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cpu_relax();
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drv_data->tx += 2;
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/* wait until transfer finished.
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checking SPIF or TXS may not guarantee transfer completion */
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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cpu_relax();
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/* discard RX data and clear RXS */
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bfin_spi_dummy_read(drv_data);
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}
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/* poll for SPI completion before return */
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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cpu_relax();
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}
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static void bfin_spi_u16_cs_chg_writer(struct driver_data *drv_data)
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{
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struct chip_data *chip = drv_data->cur_chip;
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/* clear RXS (we check for RXS inside the loop) */
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bfin_spi_dummy_read(drv_data);
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while (drv_data->tx < drv_data->tx_end) {
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bfin_spi_cs_active(drv_data, chip);
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write_TDBR(drv_data, (*(u16 *) (drv_data->tx)));
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while ((read_STAT(drv_data) & BIT_STAT_TXS))
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cpu_relax();
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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cpu_relax();
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bfin_spi_cs_deactive(drv_data, chip);
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drv_data->tx += 2;
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/* make sure transfer finished before deactiving CS */
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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cpu_relax();
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bfin_spi_dummy_read(drv_data);
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bfin_spi_cs_deactive(drv_data, chip);
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}
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}
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static void bfin_spi_u16_reader(struct driver_data *drv_data)
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{
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dev_dbg(&drv_data->pdev->dev,
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"cr-16 is 0x%x\n", read_STAT(drv_data));
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/* poll for SPI completion before start */
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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cpu_relax();
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/* clear TDBR buffer before read(else it will be shifted out) */
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write_TDBR(drv_data, 0xFFFF);
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u16 tx_val = drv_data->cur_chip->idle_tx_val;
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/* discard old RX data and clear RXS */
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bfin_spi_dummy_read(drv_data);
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while (drv_data->rx < (drv_data->rx_end - 2)) {
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while (drv_data->rx < drv_data->rx_end) {
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write_TDBR(drv_data, tx_val);
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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cpu_relax();
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*(u16 *) (drv_data->rx) = read_RDBR(drv_data);
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drv_data->rx += 2;
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}
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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cpu_relax();
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*(u16 *) (drv_data->rx) = read_SHAW(drv_data);
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drv_data->rx += 2;
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}
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static void bfin_spi_u16_cs_chg_reader(struct driver_data *drv_data)
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{
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struct chip_data *chip = drv_data->cur_chip;
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u16 tx_val = chip->idle_tx_val;
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/* poll for SPI completion before start */
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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cpu_relax();
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/* clear TDBR buffer before read(else it will be shifted out) */
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write_TDBR(drv_data, 0xFFFF);
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bfin_spi_cs_active(drv_data, chip);
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/* discard old RX data and clear RXS */
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bfin_spi_dummy_read(drv_data);
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while (drv_data->rx < drv_data->rx_end - 2) {
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bfin_spi_cs_deactive(drv_data, chip);
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while (drv_data->rx < drv_data->rx_end) {
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bfin_spi_cs_active(drv_data, chip);
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write_TDBR(drv_data, tx_val);
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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cpu_relax();
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bfin_spi_cs_active(drv_data, chip);
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*(u16 *) (drv_data->rx) = read_RDBR(drv_data);
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drv_data->rx += 2;
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bfin_spi_cs_deactive(drv_data, chip);
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}
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bfin_spi_cs_deactive(drv_data, chip);
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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cpu_relax();
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*(u16 *) (drv_data->rx) = read_SHAW(drv_data);
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drv_data->rx += 2;
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}
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static void bfin_spi_u16_duplex(struct driver_data *drv_data)
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{
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/* in duplex mode, clk is triggered by writing of TDBR */
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while (drv_data->tx < drv_data->tx_end) {
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/* discard old RX data and clear RXS */
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bfin_spi_dummy_read(drv_data);
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while (drv_data->rx < drv_data->rx_end) {
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write_TDBR(drv_data, (*(u16 *) (drv_data->tx)));
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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cpu_relax();
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drv_data->tx += 2;
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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cpu_relax();
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*(u16 *) (drv_data->rx) = read_RDBR(drv_data);
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drv_data->rx += 2;
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drv_data->tx += 2;
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}
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}
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@ -492,20 +460,18 @@ static void bfin_spi_u16_cs_chg_duplex(struct driver_data *drv_data)
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{
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struct chip_data *chip = drv_data->cur_chip;
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while (drv_data->tx < drv_data->tx_end) {
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bfin_spi_cs_active(drv_data, chip);
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/* discard old RX data and clear RXS */
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bfin_spi_dummy_read(drv_data);
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while (drv_data->rx < drv_data->rx_end) {
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bfin_spi_cs_active(drv_data, chip);
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write_TDBR(drv_data, (*(u16 *) (drv_data->tx)));
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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cpu_relax();
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drv_data->tx += 2;
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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cpu_relax();
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*(u16 *) (drv_data->rx) = read_RDBR(drv_data);
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bfin_spi_cs_deactive(drv_data, chip);
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drv_data->rx += 2;
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drv_data->tx += 2;
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bfin_spi_cs_deactive(drv_data, chip);
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}
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}
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@ -682,6 +648,13 @@ static void bfin_spi_pump_transfers(unsigned long data)
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return;
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}
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if (transfer->len == 0) {
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/* Move to next transfer of this msg */
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message->state = bfin_spi_next_transfer(drv_data);
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/* Schedule next transfer tasklet */
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tasklet_schedule(&drv_data->pump_transfers);
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}
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||||
if (transfer->tx_buf != NULL) {
|
||||
drv_data->tx = (void *)transfer->tx_buf;
|
||||
drv_data->tx_end = drv_data->tx + transfer->len;
|
||||
@ -837,9 +810,6 @@ static void bfin_spi_pump_transfers(unsigned long data)
|
||||
(unsigned long) (drv_data->rx +
|
||||
drv_data->len_in_bytes));
|
||||
|
||||
/* clear tx reg soformer data is not shifted out */
|
||||
write_TDBR(drv_data, 0xFFFF);
|
||||
|
||||
dma_config |= WNR;
|
||||
dma_start_addr = (unsigned long)drv_data->rx;
|
||||
cr |= BIT_CTL_TIMOD_DMA_RX | BIT_CTL_SENDOPT;
|
||||
@ -881,6 +851,11 @@ static void bfin_spi_pump_transfers(unsigned long data)
|
||||
/* IO mode write then read */
|
||||
dev_dbg(&drv_data->pdev->dev, "doing IO transfer\n");
|
||||
|
||||
/* we always use SPI_WRITE mode. SPI_READ mode
|
||||
seems to have problems with setting up the
|
||||
output value in TDBR prior to the transfer. */
|
||||
write_CTRL(drv_data, (cr | CFG_SPI_WRITE));
|
||||
|
||||
if (full_duplex) {
|
||||
/* full duplex mode */
|
||||
BUG_ON((drv_data->tx_end - drv_data->tx) !=
|
||||
@ -888,9 +863,6 @@ static void bfin_spi_pump_transfers(unsigned long data)
|
||||
dev_dbg(&drv_data->pdev->dev,
|
||||
"IO duplex: cr is 0x%x\n", cr);
|
||||
|
||||
/* set SPI transfer mode */
|
||||
write_CTRL(drv_data, (cr | CFG_SPI_WRITE));
|
||||
|
||||
drv_data->duplex(drv_data);
|
||||
|
||||
if (drv_data->tx != drv_data->tx_end)
|
||||
@ -900,9 +872,6 @@ static void bfin_spi_pump_transfers(unsigned long data)
|
||||
dev_dbg(&drv_data->pdev->dev,
|
||||
"IO write: cr is 0x%x\n", cr);
|
||||
|
||||
/* set SPI transfer mode */
|
||||
write_CTRL(drv_data, (cr | CFG_SPI_WRITE));
|
||||
|
||||
drv_data->write(drv_data);
|
||||
|
||||
if (drv_data->tx != drv_data->tx_end)
|
||||
@ -912,9 +881,6 @@ static void bfin_spi_pump_transfers(unsigned long data)
|
||||
dev_dbg(&drv_data->pdev->dev,
|
||||
"IO read: cr is 0x%x\n", cr);
|
||||
|
||||
/* set SPI transfer mode */
|
||||
write_CTRL(drv_data, (cr | CFG_SPI_READ));
|
||||
|
||||
drv_data->read(drv_data);
|
||||
if (drv_data->rx != drv_data->rx_end)
|
||||
tranf_success = 0;
|
||||
@ -934,7 +900,6 @@ static void bfin_spi_pump_transfers(unsigned long data)
|
||||
}
|
||||
/* Schedule next transfer tasklet */
|
||||
tasklet_schedule(&drv_data->pump_transfers);
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
@ -1092,6 +1057,7 @@ static int bfin_spi_setup(struct spi_device *spi)
|
||||
chip->cs_change_per_word = chip_info->cs_change_per_word;
|
||||
chip->cs_chg_udelay = chip_info->cs_chg_udelay;
|
||||
chip->cs_gpio = chip_info->cs_gpio;
|
||||
chip->idle_tx_val = chip_info->idle_tx_val;
|
||||
}
|
||||
|
||||
/* translate common spi framework into our register */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user