spi: spi_bfin: handle multiple spi_masters
Move global SPI regs_base and dma_ch to struct driver_data. Test on BF54x SPI Flash with 2 spi_master devices enabled. Signed-off-by: Bryan Wu <bryan.wu@analog.com> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Bryan Wu
Linus Torvalds
parent
3f479a65b3
commit
bb90eb00b6
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@ -61,31 +61,14 @@ MODULE_AUTHOR(DRV_AUTHOR);
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MODULE_DESCRIPTION(DRV_DESC);
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MODULE_LICENSE("GPL");
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#define IS_DMA_ALIGNED(x) (((u32)(x)&0x07)==0)
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#define IS_DMA_ALIGNED(x) (((u32)(x)&0x07) == 0)
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static u32 spi_dma_ch;
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static u32 spi_regs_base;
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#define DEFINE_SPI_REG(reg, off) \
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static inline u16 read_##reg(void) \
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{ return bfin_read16(spi_regs_base + off); } \
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static inline void write_##reg(u16 v) \
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{bfin_write16(spi_regs_base + off, v); }
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DEFINE_SPI_REG(CTRL, 0x00)
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DEFINE_SPI_REG(FLAG, 0x04)
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DEFINE_SPI_REG(STAT, 0x08)
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DEFINE_SPI_REG(TDBR, 0x0C)
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DEFINE_SPI_REG(RDBR, 0x10)
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DEFINE_SPI_REG(BAUD, 0x14)
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DEFINE_SPI_REG(SHAW, 0x18)
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#define START_STATE ((void*)0)
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#define RUNNING_STATE ((void*)1)
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#define DONE_STATE ((void*)2)
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#define ERROR_STATE ((void*)-1)
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#define QUEUE_RUNNING 0
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#define QUEUE_STOPPED 1
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int dma_requested;
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#define START_STATE ((void *)0)
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#define RUNNING_STATE ((void *)1)
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#define DONE_STATE ((void *)2)
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#define ERROR_STATE ((void *)-1)
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#define QUEUE_RUNNING 0
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#define QUEUE_STOPPED 1
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struct driver_data {
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/* Driver model hookup */
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@ -94,6 +77,9 @@ struct driver_data {
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/* SPI framework hookup */
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struct spi_master *master;
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/* Regs base of SPI controller */
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u32 regs_base;
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/* BFIN hookup */
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struct bfin5xx_spi_master *master_info;
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@ -118,9 +104,14 @@ struct driver_data {
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void *tx_end;
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void *rx;
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void *rx_end;
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/* DMA stuffs */
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int dma_channel;
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int dma_mapped;
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int dma_requested;
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dma_addr_t rx_dma;
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dma_addr_t tx_dma;
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size_t rx_map_len;
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size_t tx_map_len;
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u8 n_bytes;
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@ -147,20 +138,34 @@ struct chip_data {
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void (*duplex) (struct driver_data *);
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};
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#define DEFINE_SPI_REG(reg, off) \
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static inline u16 read_##reg(struct driver_data *drv_data) \
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{ return bfin_read16(drv_data->regs_base + off); } \
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static inline void write_##reg(struct driver_data *drv_data, u16 v) \
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{ bfin_write16(drv_data->regs_base + off, v); }
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DEFINE_SPI_REG(CTRL, 0x00)
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DEFINE_SPI_REG(FLAG, 0x04)
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DEFINE_SPI_REG(STAT, 0x08)
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DEFINE_SPI_REG(TDBR, 0x0C)
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DEFINE_SPI_REG(RDBR, 0x10)
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DEFINE_SPI_REG(BAUD, 0x14)
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DEFINE_SPI_REG(SHAW, 0x18)
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static void bfin_spi_enable(struct driver_data *drv_data)
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{
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u16 cr;
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cr = read_CTRL();
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write_CTRL(cr | BIT_CTL_ENABLE);
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cr = read_CTRL(drv_data);
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write_CTRL(drv_data, (cr | BIT_CTL_ENABLE));
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}
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static void bfin_spi_disable(struct driver_data *drv_data)
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{
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u16 cr;
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cr = read_CTRL();
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write_CTRL(cr & (~BIT_CTL_ENABLE));
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cr = read_CTRL(drv_data);
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write_CTRL(drv_data, (cr & (~BIT_CTL_ENABLE)));
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}
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/* Caculate the SPI_BAUD register value based on input HZ */
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@ -180,32 +185,32 @@ static int flush(struct driver_data *drv_data)
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unsigned long limit = loops_per_jiffy << 1;
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/* wait for stop and clear stat */
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while (!(read_STAT() & BIT_STAT_SPIF) && limit--)
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF) && limit--)
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continue;
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write_STAT(BIT_STAT_CLR);
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write_STAT(drv_data, BIT_STAT_CLR);
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return limit;
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}
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/* Chip select operation functions for cs_change flag */
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static void cs_active(struct chip_data *chip)
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static void cs_active(struct driver_data *drv_data, struct chip_data *chip)
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{
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u16 flag = read_FLAG();
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u16 flag = read_FLAG(drv_data);
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flag |= chip->flag;
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flag &= ~(chip->flag << 8);
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write_FLAG(flag);
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write_FLAG(drv_data, flag);
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}
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static void cs_deactive(struct chip_data *chip)
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static void cs_deactive(struct driver_data *drv_data, struct chip_data *chip)
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{
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u16 flag = read_FLAG();
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u16 flag = read_FLAG(drv_data);
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flag |= (chip->flag << 8);
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write_FLAG(flag);
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write_FLAG(drv_data, flag);
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}
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#define MAX_SPI_SSEL 7
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@ -217,16 +222,16 @@ static int restore_state(struct driver_data *drv_data)
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int ret = 0;
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/* Clear status and disable clock */
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write_STAT(BIT_STAT_CLR);
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write_STAT(drv_data, BIT_STAT_CLR);
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bfin_spi_disable(drv_data);
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dev_dbg(&drv_data->pdev->dev, "restoring spi ctl state\n");
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/* Load the registers */
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cs_deactive(chip);
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write_BAUD(chip->baud);
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cs_deactive(drv_data, chip);
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write_BAUD(drv_data, chip->baud);
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chip->ctl_reg &= (~BIT_CTL_TIMOD);
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chip->ctl_reg |= (chip->width << 8);
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write_CTRL(chip->ctl_reg);
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write_CTRL(drv_data, chip->ctl_reg);
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bfin_spi_enable(drv_data);
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@ -239,10 +244,10 @@ static int restore_state(struct driver_data *drv_data)
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}
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/* used to kick off transfer in rx mode */
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static unsigned short dummy_read(void)
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static unsigned short 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();
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tmp = read_RDBR(drv_data);
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return tmp;
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}
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@ -251,8 +256,8 @@ static void null_writer(struct driver_data *drv_data)
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u8 n_bytes = drv_data->n_bytes;
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while (drv_data->tx < drv_data->tx_end) {
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write_TDBR(0);
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while ((read_STAT() & BIT_STAT_TXS))
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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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continue;
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drv_data->tx += n_bytes;
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}
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@ -261,12 +266,12 @@ static void null_writer(struct driver_data *drv_data)
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static void 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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dummy_read();
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dummy_read(drv_data);
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while (drv_data->rx < drv_data->rx_end) {
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while (!(read_STAT() & BIT_STAT_RXS))
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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continue;
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dummy_read();
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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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@ -274,15 +279,15 @@ static void null_reader(struct driver_data *drv_data)
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static void 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());
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"cr8-s 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() & BIT_STAT_SPIF))
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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continue;
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while (drv_data->tx < drv_data->tx_end) {
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write_TDBR(*(u8 *) (drv_data->tx));
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while (read_STAT() & BIT_STAT_TXS)
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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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continue;
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++drv_data->tx;
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}
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@ -293,16 +298,16 @@ static void u8_cs_chg_writer(struct driver_data *drv_data)
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struct chip_data *chip = drv_data->cur_chip;
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/* poll for SPI completion before start */
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while (!(read_STAT() & BIT_STAT_SPIF))
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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continue;
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while (drv_data->tx < drv_data->tx_end) {
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cs_active(chip);
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cs_active(drv_data, chip);
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write_TDBR(*(u8 *) (drv_data->tx));
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while (read_STAT() & BIT_STAT_TXS)
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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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continue;
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cs_deactive(chip);
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cs_deactive(drv_data, chip);
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if (chip->cs_chg_udelay)
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udelay(chip->cs_chg_udelay);
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@ -313,27 +318,27 @@ static void u8_cs_chg_writer(struct driver_data *drv_data)
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static void 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());
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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() & BIT_STAT_SPIF))
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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continue;
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/* clear TDBR buffer before read(else it will be shifted out) */
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write_TDBR(0xFFFF);
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write_TDBR(drv_data, 0xFFFF);
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dummy_read();
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dummy_read(drv_data);
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while (drv_data->rx < drv_data->rx_end - 1) {
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while (!(read_STAT() & BIT_STAT_RXS))
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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continue;
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*(u8 *) (drv_data->rx) = read_RDBR();
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*(u8 *) (drv_data->rx) = read_RDBR(drv_data);
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++drv_data->rx;
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}
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while (!(read_STAT() & BIT_STAT_RXS))
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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continue;
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*(u8 *) (drv_data->rx) = read_SHAW();
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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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@ -342,49 +347,49 @@ static void u8_cs_chg_reader(struct driver_data *drv_data)
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struct chip_data *chip = drv_data->cur_chip;
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/* poll for SPI completion before start */
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while (!(read_STAT() & BIT_STAT_SPIF))
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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continue;
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/* clear TDBR buffer before read(else it will be shifted out) */
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write_TDBR(0xFFFF);
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write_TDBR(drv_data, 0xFFFF);
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cs_active(chip);
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dummy_read();
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cs_active(drv_data, chip);
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dummy_read(drv_data);
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while (drv_data->rx < drv_data->rx_end - 1) {
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cs_deactive(chip);
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cs_deactive(drv_data, chip);
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if (chip->cs_chg_udelay)
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udelay(chip->cs_chg_udelay);
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while (!(read_STAT() & BIT_STAT_RXS))
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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continue;
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cs_active(chip);
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*(u8 *) (drv_data->rx) = read_RDBR();
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cs_active(drv_data, chip);
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*(u8 *) (drv_data->rx) = read_RDBR(drv_data);
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++drv_data->rx;
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}
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cs_deactive(chip);
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cs_deactive(drv_data, chip);
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while (!(read_STAT() & BIT_STAT_RXS))
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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continue;
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*(u8 *) (drv_data->rx) = read_SHAW();
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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 u8_duplex(struct driver_data *drv_data)
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{
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/* poll for SPI completion before start */
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while (!(read_STAT() & BIT_STAT_SPIF))
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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continue;
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/* in duplex mode, clk is triggered by writing of TDBR */
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while (drv_data->rx < drv_data->rx_end) {
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write_TDBR(*(u8 *) (drv_data->tx));
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while (read_STAT() & BIT_STAT_TXS)
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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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continue;
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while (!(read_STAT() & BIT_STAT_RXS))
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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continue;
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*(u8 *) (drv_data->rx) = read_RDBR();
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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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}
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@ -395,19 +400,19 @@ static void u8_cs_chg_duplex(struct driver_data *drv_data)
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struct chip_data *chip = drv_data->cur_chip;
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/* poll for SPI completion before start */
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while (!(read_STAT() & BIT_STAT_SPIF))
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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continue;
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while (drv_data->rx < drv_data->rx_end) {
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cs_active(chip);
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cs_active(drv_data, chip);
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write_TDBR(*(u8 *) (drv_data->tx));
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while (read_STAT() & BIT_STAT_TXS)
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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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continue;
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while (!(read_STAT() & BIT_STAT_RXS))
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while (!(read_STAT(drv_data) & BIT_STAT_RXS))
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continue;
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*(u8 *) (drv_data->rx) = read_RDBR();
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cs_deactive(chip);
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*(u8 *) (drv_data->rx) = read_RDBR(drv_data);
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cs_deactive(drv_data, chip);
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if (chip->cs_chg_udelay)
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udelay(chip->cs_chg_udelay);
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@ -419,15 +424,15 @@ static void u8_cs_chg_duplex(struct driver_data *drv_data)
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static void 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());
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"cr16 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() & BIT_STAT_SPIF))
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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continue;
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while (drv_data->tx < drv_data->tx_end) {
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write_TDBR(*(u16 *) (drv_data->tx));
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while ((read_STAT() & BIT_STAT_TXS))
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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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continue;
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drv_data->tx += 2;
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}
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@ -438,16 +443,16 @@ static void u16_cs_chg_writer(struct driver_data *drv_data)
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struct chip_data *chip = drv_data->cur_chip;
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/* poll for SPI completion before start */
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while (!(read_STAT() & BIT_STAT_SPIF))
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while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
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continue;
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while (drv_data->tx < drv_data->tx_end) {
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cs_active(chip);
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cs_active(drv_data, chip);
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write_TDBR(*(u16 *) (drv_data->tx));
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while ((read_STAT() & BIT_STAT_TXS))
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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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continue;
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cs_deactive(chip);
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cs_deactive(drv_data, chip);
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if (chip->cs_chg_udelay)
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udelay(chip->cs_chg_udelay);
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@ -458,27 +463,27 @@ static void u16_cs_chg_writer(struct driver_data *drv_data)
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static void 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());
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"cr-16 is 0x%x\n", read_STAT(drv_data));
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/* poll for SPI completion before start */
|
||||
while (!(read_STAT() & BIT_STAT_SPIF))
|
||||
while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
|
||||
continue;
|
||||
|
||||
/* clear TDBR buffer before read(else it will be shifted out) */
|
||||
write_TDBR(0xFFFF);
|
||||
write_TDBR(drv_data, 0xFFFF);
|
||||
|
||||
dummy_read();
|
||||
dummy_read(drv_data);
|
||||
|
||||
while (drv_data->rx < (drv_data->rx_end - 2)) {
|
||||
while (!(read_STAT() & BIT_STAT_RXS))
|
||||
while (!(read_STAT(drv_data) & BIT_STAT_RXS))
|
||||
continue;
|
||||
*(u16 *) (drv_data->rx) = read_RDBR();
|
||||
*(u16 *) (drv_data->rx) = read_RDBR(drv_data);
|
||||
drv_data->rx += 2;
|
||||
}
|
||||
|
||||
while (!(read_STAT() & BIT_STAT_RXS))
|
||||
while (!(read_STAT(drv_data) & BIT_STAT_RXS))
|
||||
continue;
|
||||
*(u16 *) (drv_data->rx) = read_SHAW();
|
||||
*(u16 *) (drv_data->rx) = read_SHAW(drv_data);
|
||||
drv_data->rx += 2;
|
||||
}
|
||||
|
||||
|
|
@ -487,49 +492,49 @@ static void u16_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() & BIT_STAT_SPIF))
|
||||
while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
|
||||
continue;
|
||||
|
||||
/* clear TDBR buffer before read(else it will be shifted out) */
|
||||
write_TDBR(0xFFFF);
|
||||
write_TDBR(drv_data, 0xFFFF);
|
||||
|
||||
cs_active(chip);
|
||||
dummy_read();
|
||||
cs_active(drv_data, chip);
|
||||
dummy_read(drv_data);
|
||||
|
||||
while (drv_data->rx < drv_data->rx_end) {
|
||||
cs_deactive(chip);
|
||||
cs_deactive(drv_data, chip);
|
||||
|
||||
if (chip->cs_chg_udelay)
|
||||
udelay(chip->cs_chg_udelay);
|
||||
|
||||
while (!(read_STAT() & BIT_STAT_RXS))
|
||||
while (!(read_STAT(drv_data) & BIT_STAT_RXS))
|
||||
continue;
|
||||
cs_active(chip);
|
||||
*(u16 *) (drv_data->rx) = read_RDBR();
|
||||
cs_active(drv_data, chip);
|
||||
*(u16 *) (drv_data->rx) = read_RDBR(drv_data);
|
||||
drv_data->rx += 2;
|
||||
}
|
||||
cs_deactive(chip);
|
||||
cs_deactive(drv_data, chip);
|
||||
|
||||
while (!(read_STAT() & BIT_STAT_RXS))
|
||||
while (!(read_STAT(drv_data) & BIT_STAT_RXS))
|
||||
continue;
|
||||
*(u16 *) (drv_data->rx) = read_SHAW();
|
||||
*(u16 *) (drv_data->rx) = read_SHAW(drv_data);
|
||||
drv_data->rx += 2;
|
||||
}
|
||||
|
||||
static void u16_duplex(struct driver_data *drv_data)
|
||||
{
|
||||
/* poll for SPI completion before start */
|
||||
while (!(read_STAT() & BIT_STAT_SPIF))
|
||||
while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
|
||||
continue;
|
||||
|
||||
/* in duplex mode, clk is triggered by writing of TDBR */
|
||||
while (drv_data->tx < drv_data->tx_end) {
|
||||
write_TDBR(*(u16 *) (drv_data->tx));
|
||||
while (read_STAT() & BIT_STAT_TXS)
|
||||
write_TDBR(drv_data, (*(u16 *) (drv_data->tx)));
|
||||
while (read_STAT(drv_data) & BIT_STAT_TXS)
|
||||
continue;
|
||||
while (!(read_STAT() & BIT_STAT_RXS))
|
||||
while (!(read_STAT(drv_data) & BIT_STAT_RXS))
|
||||
continue;
|
||||
*(u16 *) (drv_data->rx) = read_RDBR();
|
||||
*(u16 *) (drv_data->rx) = read_RDBR(drv_data);
|
||||
drv_data->rx += 2;
|
||||
drv_data->tx += 2;
|
||||
}
|
||||
|
|
@ -540,19 +545,19 @@ 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() & BIT_STAT_SPIF))
|
||||
while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
|
||||
continue;
|
||||
|
||||
while (drv_data->tx < drv_data->tx_end) {
|
||||
cs_active(chip);
|
||||
cs_active(drv_data, chip);
|
||||
|
||||
write_TDBR(*(u16 *) (drv_data->tx));
|
||||
while (read_STAT() & BIT_STAT_TXS)
|
||||
write_TDBR(drv_data, (*(u16 *) (drv_data->tx)));
|
||||
while (read_STAT(drv_data) & BIT_STAT_TXS)
|
||||
continue;
|
||||
while (!(read_STAT() & BIT_STAT_RXS))
|
||||
while (!(read_STAT(drv_data) & BIT_STAT_RXS))
|
||||
continue;
|
||||
*(u16 *) (drv_data->rx) = read_RDBR();
|
||||
cs_deactive(chip);
|
||||
*(u16 *) (drv_data->rx) = read_RDBR(drv_data);
|
||||
cs_deactive(drv_data, chip);
|
||||
|
||||
if (chip->cs_chg_udelay)
|
||||
udelay(chip->cs_chg_udelay);
|
||||
|
|
@ -603,12 +608,12 @@ static void giveback(struct driver_data *drv_data)
|
|||
|
||||
/* disable chip select signal. And not stop spi in autobuffer mode */
|
||||
if (drv_data->tx_dma != 0xFFFF) {
|
||||
cs_deactive(chip);
|
||||
cs_deactive(drv_data, chip);
|
||||
bfin_spi_disable(drv_data);
|
||||
}
|
||||
|
||||
if (!drv_data->cs_change)
|
||||
cs_deactive(chip);
|
||||
cs_deactive(drv_data, chip);
|
||||
|
||||
if (msg->complete)
|
||||
msg->complete(msg->context);
|
||||
|
|
@ -617,14 +622,14 @@ 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 spi_message *msg = drv_data->cur_msg;
|
||||
struct chip_data *chip = drv_data->cur_chip;
|
||||
struct spi_message *msg = drv_data->cur_msg;
|
||||
|
||||
dev_dbg(&drv_data->pdev->dev, "in dma_irq_handler\n");
|
||||
clear_dma_irqstat(spi_dma_ch);
|
||||
clear_dma_irqstat(drv_data->dma_channel);
|
||||
|
||||
/* Wait for DMA to complete */
|
||||
while (get_dma_curr_irqstat(spi_dma_ch) & DMA_RUN)
|
||||
while (get_dma_curr_irqstat(drv_data->dma_channel) & DMA_RUN)
|
||||
continue;
|
||||
|
||||
/*
|
||||
|
|
@ -634,18 +639,18 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id)
|
|||
* register until it goes low for 2 successive reads
|
||||
*/
|
||||
if (drv_data->tx != NULL) {
|
||||
while ((read_STAT() & TXS) ||
|
||||
(read_STAT() & TXS))
|
||||
while ((read_STAT(drv_data) & TXS) ||
|
||||
(read_STAT(drv_data) & TXS))
|
||||
continue;
|
||||
}
|
||||
|
||||
while (!(read_STAT() & SPIF))
|
||||
while (!(read_STAT(drv_data) & SPIF))
|
||||
continue;
|
||||
|
||||
msg->actual_length += drv_data->len_in_bytes;
|
||||
|
||||
if (drv_data->cs_change)
|
||||
cs_deactive(chip);
|
||||
cs_deactive(drv_data, chip);
|
||||
|
||||
/* Move to next transfer */
|
||||
msg->state = next_transfer(drv_data);
|
||||
|
|
@ -656,8 +661,8 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id)
|
|||
/* free the irq handler before next transfer */
|
||||
dev_dbg(&drv_data->pdev->dev,
|
||||
"disable dma channel irq%d\n",
|
||||
spi_dma_ch);
|
||||
dma_disable_irq(spi_dma_ch);
|
||||
drv_data->dma_channel);
|
||||
dma_disable_irq(drv_data->dma_channel);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
|
@ -751,9 +756,9 @@ static void pump_transfers(unsigned long data)
|
|||
message->state = RUNNING_STATE;
|
||||
dma_config = 0;
|
||||
|
||||
write_STAT(BIT_STAT_CLR);
|
||||
cr = (read_CTRL() & (~BIT_CTL_TIMOD));
|
||||
cs_active(chip);
|
||||
write_STAT(drv_data, BIT_STAT_CLR);
|
||||
cr = (read_CTRL(drv_data) & (~BIT_CTL_TIMOD));
|
||||
cs_active(drv_data, chip);
|
||||
|
||||
dev_dbg(&drv_data->pdev->dev,
|
||||
"now pumping a transfer: width is %d, len is %d\n",
|
||||
|
|
@ -766,23 +771,23 @@ static void pump_transfers(unsigned long data)
|
|||
*/
|
||||
if (drv_data->cur_chip->enable_dma && drv_data->len > 6) {
|
||||
|
||||
disable_dma(spi_dma_ch);
|
||||
clear_dma_irqstat(spi_dma_ch);
|
||||
disable_dma(drv_data->dma_channel);
|
||||
clear_dma_irqstat(drv_data->dma_channel);
|
||||
|
||||
/* config dma channel */
|
||||
dev_dbg(&drv_data->pdev->dev, "doing dma transfer\n");
|
||||
if (width == CFG_SPI_WORDSIZE16) {
|
||||
set_dma_x_count(spi_dma_ch, drv_data->len);
|
||||
set_dma_x_modify(spi_dma_ch, 2);
|
||||
set_dma_x_count(drv_data->dma_channel, drv_data->len);
|
||||
set_dma_x_modify(drv_data->dma_channel, 2);
|
||||
dma_width = WDSIZE_16;
|
||||
} else {
|
||||
set_dma_x_count(spi_dma_ch, drv_data->len);
|
||||
set_dma_x_modify(spi_dma_ch, 1);
|
||||
set_dma_x_count(drv_data->dma_channel, drv_data->len);
|
||||
set_dma_x_modify(drv_data->dma_channel, 1);
|
||||
dma_width = WDSIZE_8;
|
||||
}
|
||||
|
||||
/* poll for SPI completion before start */
|
||||
while (!(read_STAT() & BIT_STAT_SPIF))
|
||||
while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
|
||||
continue;
|
||||
|
||||
/* dirty hack for autobuffer DMA mode */
|
||||
|
|
@ -791,15 +796,15 @@ static void pump_transfers(unsigned long data)
|
|||
"doing autobuffer DMA out.\n");
|
||||
|
||||
/* set SPI transfer mode */
|
||||
write_CTRL(cr | CFG_SPI_DMAWRITE);
|
||||
write_CTRL(drv_data, (cr | CFG_SPI_DMAWRITE));
|
||||
|
||||
/* no irq in autobuffer mode */
|
||||
dma_config =
|
||||
(DMAFLOW_AUTO | RESTART | dma_width | DI_EN);
|
||||
set_dma_config(spi_dma_ch, dma_config);
|
||||
set_dma_start_addr(spi_dma_ch,
|
||||
set_dma_config(drv_data->dma_channel, dma_config);
|
||||
set_dma_start_addr(drv_data->dma_channel,
|
||||
(unsigned long)drv_data->tx);
|
||||
enable_dma(spi_dma_ch);
|
||||
enable_dma(drv_data->dma_channel);
|
||||
|
||||
/* just return here, there can only be one transfer in this mode */
|
||||
message->status = 0;
|
||||
|
|
@ -813,34 +818,34 @@ static void pump_transfers(unsigned long data)
|
|||
dev_dbg(&drv_data->pdev->dev, "doing DMA in.\n");
|
||||
|
||||
/* set SPI transfer mode */
|
||||
write_CTRL(cr | CFG_SPI_DMAREAD);
|
||||
write_CTRL(drv_data, (cr | CFG_SPI_DMAREAD));
|
||||
|
||||
/* clear tx reg soformer data is not shifted out */
|
||||
write_TDBR(0xFFFF);
|
||||
write_TDBR(drv_data, 0xFFFF);
|
||||
|
||||
set_dma_x_count(spi_dma_ch, drv_data->len);
|
||||
set_dma_x_count(drv_data->dma_channel, drv_data->len);
|
||||
|
||||
/* start dma */
|
||||
dma_enable_irq(spi_dma_ch);
|
||||
dma_enable_irq(drv_data->dma_channel);
|
||||
dma_config = (WNR | RESTART | dma_width | DI_EN);
|
||||
set_dma_config(spi_dma_ch, dma_config);
|
||||
set_dma_start_addr(spi_dma_ch,
|
||||
set_dma_config(drv_data->dma_channel, dma_config);
|
||||
set_dma_start_addr(drv_data->dma_channel,
|
||||
(unsigned long)drv_data->rx);
|
||||
enable_dma(spi_dma_ch);
|
||||
enable_dma(drv_data->dma_channel);
|
||||
|
||||
} else if (drv_data->tx != NULL) {
|
||||
dev_dbg(&drv_data->pdev->dev, "doing DMA out.\n");
|
||||
|
||||
/* set SPI transfer mode */
|
||||
write_CTRL(cr | CFG_SPI_DMAWRITE);
|
||||
write_CTRL(drv_data, (cr | CFG_SPI_DMAWRITE));
|
||||
|
||||
/* start dma */
|
||||
dma_enable_irq(spi_dma_ch);
|
||||
dma_enable_irq(drv_data->dma_channel);
|
||||
dma_config = (RESTART | dma_width | DI_EN);
|
||||
set_dma_config(spi_dma_ch, dma_config);
|
||||
set_dma_start_addr(spi_dma_ch,
|
||||
set_dma_config(drv_data->dma_channel, dma_config);
|
||||
set_dma_start_addr(drv_data->dma_channel,
|
||||
(unsigned long)drv_data->tx);
|
||||
enable_dma(spi_dma_ch);
|
||||
enable_dma(drv_data->dma_channel);
|
||||
}
|
||||
} else {
|
||||
/* IO mode write then read */
|
||||
|
|
@ -854,7 +859,7 @@ static void pump_transfers(unsigned long data)
|
|||
"IO duplex: cr is 0x%x\n", cr);
|
||||
|
||||
/* set SPI transfer mode */
|
||||
write_CTRL(cr | CFG_SPI_WRITE);
|
||||
write_CTRL(drv_data, (cr | CFG_SPI_WRITE));
|
||||
|
||||
drv_data->duplex(drv_data);
|
||||
|
||||
|
|
@ -866,7 +871,7 @@ static void pump_transfers(unsigned long data)
|
|||
"IO write: cr is 0x%x\n", cr);
|
||||
|
||||
/* set SPI transfer mode */
|
||||
write_CTRL(cr | CFG_SPI_WRITE);
|
||||
write_CTRL(drv_data, (cr | CFG_SPI_WRITE));
|
||||
|
||||
drv_data->write(drv_data);
|
||||
|
||||
|
|
@ -878,7 +883,7 @@ static void pump_transfers(unsigned long data)
|
|||
"IO read: cr is 0x%x\n", cr);
|
||||
|
||||
/* set SPI transfer mode */
|
||||
write_CTRL(cr | CFG_SPI_READ);
|
||||
write_CTRL(drv_data, (cr | CFG_SPI_READ));
|
||||
|
||||
drv_data->read(drv_data);
|
||||
if (drv_data->rx != drv_data->rx_end)
|
||||
|
|
@ -1075,20 +1080,20 @@ static int setup(struct spi_device *spi)
|
|||
* if any one SPI chip is registered and wants DMA, request the
|
||||
* DMA channel for it
|
||||
*/
|
||||
if (chip->enable_dma && !dma_requested) {
|
||||
if (chip->enable_dma && !drv_data->dma_requested) {
|
||||
/* register dma irq handler */
|
||||
if (request_dma(spi_dma_ch, "BF53x_SPI_DMA") < 0) {
|
||||
if (request_dma(drv_data->dma_channel, "BF53x_SPI_DMA") < 0) {
|
||||
dev_dbg(&spi->dev,
|
||||
"Unable to request BlackFin SPI DMA channel\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
if (set_dma_callback(spi_dma_ch, (void *)dma_irq_handler,
|
||||
drv_data) < 0) {
|
||||
if (set_dma_callback(drv_data->dma_channel,
|
||||
(void *)dma_irq_handler, drv_data) < 0) {
|
||||
dev_dbg(&spi->dev, "Unable to set dma callback\n");
|
||||
return -EPERM;
|
||||
}
|
||||
dma_disable_irq(spi_dma_ch);
|
||||
dma_requested = 1;
|
||||
dma_disable_irq(drv_data->dma_channel);
|
||||
drv_data->dma_requested = 1;
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -1304,15 +1309,16 @@ static int __init bfin5xx_spi_probe(struct platform_device *pdev)
|
|||
goto out_error_get_res;
|
||||
}
|
||||
|
||||
spi_regs_base = (u32) ioremap(res->start, (res->end - res->start)+1);
|
||||
if (!spi_regs_base) {
|
||||
drv_data->regs_base = (u32) ioremap(res->start,
|
||||
(res->end - res->start + 1));
|
||||
if (!drv_data->regs_base) {
|
||||
dev_err(dev, "Cannot map IO\n");
|
||||
status = -ENXIO;
|
||||
goto out_error_ioremap;
|
||||
}
|
||||
|
||||
spi_dma_ch = platform_get_irq(pdev, 0);
|
||||
if (spi_dma_ch < 0) {
|
||||
drv_data->dma_channel = platform_get_irq(pdev, 0);
|
||||
if (drv_data->dma_channel < 0) {
|
||||
dev_err(dev, "No DMA channel specified\n");
|
||||
status = -ENOENT;
|
||||
goto out_error_no_dma_ch;
|
||||
|
|
@ -1344,14 +1350,15 @@ static int __init bfin5xx_spi_probe(struct platform_device *pdev)
|
|||
goto out_error;
|
||||
}
|
||||
|
||||
dev_info(dev, "%s, Version %s, regs_base @ 0x%08x\n",
|
||||
DRV_DESC, DRV_VERSION, spi_regs_base);
|
||||
dev_info(dev, "%s, Version %s, regs_base@0x%08x, dma channel@%d\n",
|
||||
DRV_DESC, DRV_VERSION, drv_data->regs_base,
|
||||
drv_data->dma_channel);
|
||||
return status;
|
||||
|
||||
out_error_queue_alloc:
|
||||
destroy_queue(drv_data);
|
||||
out_error_no_dma_ch:
|
||||
iounmap((void *) spi_regs_base);
|
||||
iounmap((void *) drv_data->regs_base);
|
||||
out_error_ioremap:
|
||||
out_error_get_res:
|
||||
out_error:
|
||||
|
|
@ -1379,8 +1386,8 @@ static int __devexit bfin5xx_spi_remove(struct platform_device *pdev)
|
|||
|
||||
/* Release DMA */
|
||||
if (drv_data->master_info->enable_dma) {
|
||||
if (dma_channel_active(spi_dma_ch))
|
||||
free_dma(spi_dma_ch);
|
||||
if (dma_channel_active(drv_data->dma_channel))
|
||||
free_dma(drv_data->dma_channel);
|
||||
}
|
||||
|
||||
/* Disconnect from the SPI framework */
|
||||
|
|
|
|||
Reference in New Issue