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Subject[RFC 04/25] spi: gpio: Implement LSB First bitbang support
Date
Add support for slave DT property spi-lsb-first, i.e., SPI_LSB_FIRST mode.

Duplicate the inline helpers bitbang_txrx_be_cpha{0,1} as LE versions.
Make checkpatch.pl happy by changing "unsigned" to "unsigned int".

Conditionally call them from all the spi-gpio txrx_word callbacks.

Signed-off-by: Andreas Färber <afaerber@suse.de>
---
drivers/spi/spi-bitbang-txrx.h | 68 ++++++++++++++++++++++++++++++++++++++++--
drivers/spi/spi-gpio.c | 42 ++++++++++++++++++++------
2 files changed, 99 insertions(+), 11 deletions(-)

diff --git a/drivers/spi/spi-bitbang-txrx.h b/drivers/spi/spi-bitbang-txrx.h
index ae61d72c7d28..999a89325325 100644
--- a/drivers/spi/spi-bitbang-txrx.h
+++ b/drivers/spi/spi-bitbang-txrx.h
@@ -45,7 +45,7 @@

static inline u32
bitbang_txrx_be_cpha0(struct spi_device *spi,
- unsigned nsecs, unsigned cpol, unsigned flags,
+ unsigned int nsecs, unsigned int cpol, unsigned int flags,
u32 word, u8 bits)
{
/* if (cpol == 0) this is SPI_MODE_0; else this is SPI_MODE_2 */
@@ -77,7 +77,7 @@ bitbang_txrx_be_cpha0(struct spi_device *spi,

static inline u32
bitbang_txrx_be_cpha1(struct spi_device *spi,
- unsigned nsecs, unsigned cpol, unsigned flags,
+ unsigned int nsecs, unsigned int cpol, unsigned int flags,
u32 word, u8 bits)
{
/* if (cpol == 0) this is SPI_MODE_1; else this is SPI_MODE_3 */
@@ -106,3 +106,67 @@ bitbang_txrx_be_cpha1(struct spi_device *spi,
}
return word;
}
+
+static inline u32
+bitbang_txrx_le_cpha0(struct spi_device *spi,
+ unsigned int nsecs, unsigned int cpol, unsigned int flags,
+ u32 word, u8 bits)
+{
+ /* if (cpol == 0) this is SPI_MODE_0; else this is SPI_MODE_2 */
+
+ u32 oldbit = !(word & 1);
+ /* clock starts at inactive polarity */
+ for (; likely(bits); bits--) {
+
+ /* setup LSB (to slave) on trailing edge */
+ if ((flags & SPI_MASTER_NO_TX) == 0) {
+ if ((word & 1) != oldbit) {
+ setmosi(spi, word & 1);
+ oldbit = word & 1;
+ }
+ }
+ spidelay(nsecs); /* T(setup) */
+
+ setsck(spi, !cpol);
+ spidelay(nsecs);
+
+ /* sample LSB (from slave) on leading edge */
+ word >>= 1;
+ if ((flags & SPI_MASTER_NO_RX) == 0)
+ word |= getmiso(spi) << (bits - 1);
+ setsck(spi, cpol);
+ }
+ return word;
+}
+
+static inline u32
+bitbang_txrx_le_cpha1(struct spi_device *spi,
+ unsigned int nsecs, unsigned int cpol, unsigned int flags,
+ u32 word, u8 bits)
+{
+ /* if (cpol == 0) this is SPI_MODE_1; else this is SPI_MODE_3 */
+
+ u32 oldbit = !(word & 1);
+ /* clock starts at inactive polarity */
+ for (; likely(bits); bits--) {
+
+ /* setup LSB (to slave) on leading edge */
+ setsck(spi, !cpol);
+ if ((flags & SPI_MASTER_NO_TX) == 0) {
+ if ((word & 1) != oldbit) {
+ setmosi(spi, word & 1);
+ oldbit = word & 1;
+ }
+ }
+ spidelay(nsecs); /* T(setup) */
+
+ setsck(spi, cpol);
+ spidelay(nsecs);
+
+ /* sample LSB (from slave) on trailing edge */
+ word >>= 1;
+ if ((flags & SPI_MASTER_NO_RX) == 0)
+ word |= getmiso(spi) << (bits - 1);
+ }
+ return word;
+}
diff --git a/drivers/spi/spi-gpio.c b/drivers/spi/spi-gpio.c
index 7ceb0ba27b75..493723eda844 100644
--- a/drivers/spi/spi-gpio.c
+++ b/drivers/spi/spi-gpio.c
@@ -135,25 +135,37 @@ static inline int getmiso(const struct spi_device *spi)
static u32 spi_gpio_txrx_word_mode0(struct spi_device *spi,
unsigned nsecs, u32 word, u8 bits, unsigned flags)
{
- return bitbang_txrx_be_cpha0(spi, nsecs, 0, flags, word, bits);
+ if (unlikely(spi->mode & SPI_LSB_FIRST))
+ return bitbang_txrx_le_cpha0(spi, nsecs, 0, flags, word, bits);
+ else
+ return bitbang_txrx_be_cpha0(spi, nsecs, 0, flags, word, bits);
}

static u32 spi_gpio_txrx_word_mode1(struct spi_device *spi,
unsigned nsecs, u32 word, u8 bits, unsigned flags)
{
- return bitbang_txrx_be_cpha1(spi, nsecs, 0, flags, word, bits);
+ if (unlikely(spi->mode & SPI_LSB_FIRST))
+ return bitbang_txrx_le_cpha1(spi, nsecs, 0, flags, word, bits);
+ else
+ return bitbang_txrx_be_cpha1(spi, nsecs, 0, flags, word, bits);
}

static u32 spi_gpio_txrx_word_mode2(struct spi_device *spi,
unsigned nsecs, u32 word, u8 bits, unsigned flags)
{
- return bitbang_txrx_be_cpha0(spi, nsecs, 1, flags, word, bits);
+ if (unlikely(spi->mode & SPI_LSB_FIRST))
+ return bitbang_txrx_le_cpha0(spi, nsecs, 1, flags, word, bits);
+ else
+ return bitbang_txrx_be_cpha0(spi, nsecs, 1, flags, word, bits);
}

static u32 spi_gpio_txrx_word_mode3(struct spi_device *spi,
unsigned nsecs, u32 word, u8 bits, unsigned flags)
{
- return bitbang_txrx_be_cpha1(spi, nsecs, 1, flags, word, bits);
+ if (unlikely(spi->mode & SPI_LSB_FIRST))
+ return bitbang_txrx_le_cpha1(spi, nsecs, 1, flags, word, bits);
+ else
+ return bitbang_txrx_be_cpha1(spi, nsecs, 1, flags, word, bits);
}

/*
@@ -170,28 +182,40 @@ static u32 spi_gpio_spec_txrx_word_mode0(struct spi_device *spi,
unsigned nsecs, u32 word, u8 bits, unsigned flags)
{
flags = spi->master->flags;
- return bitbang_txrx_be_cpha0(spi, nsecs, 0, flags, word, bits);
+ if (unlikely(spi->mode & SPI_LSB_FIRST))
+ return bitbang_txrx_le_cpha0(spi, nsecs, 0, flags, word, bits);
+ else
+ return bitbang_txrx_be_cpha0(spi, nsecs, 0, flags, word, bits);
}

static u32 spi_gpio_spec_txrx_word_mode1(struct spi_device *spi,
unsigned nsecs, u32 word, u8 bits, unsigned flags)
{
flags = spi->master->flags;
- return bitbang_txrx_be_cpha1(spi, nsecs, 0, flags, word, bits);
+ if (unlikely(spi->mode & SPI_LSB_FIRST))
+ return bitbang_txrx_le_cpha1(spi, nsecs, 0, flags, word, bits);
+ else
+ return bitbang_txrx_be_cpha1(spi, nsecs, 0, flags, word, bits);
}

static u32 spi_gpio_spec_txrx_word_mode2(struct spi_device *spi,
unsigned nsecs, u32 word, u8 bits, unsigned flags)
{
flags = spi->master->flags;
- return bitbang_txrx_be_cpha0(spi, nsecs, 1, flags, word, bits);
+ if (unlikely(spi->mode & SPI_LSB_FIRST))
+ return bitbang_txrx_le_cpha0(spi, nsecs, 1, flags, word, bits);
+ else
+ return bitbang_txrx_be_cpha0(spi, nsecs, 1, flags, word, bits);
}

static u32 spi_gpio_spec_txrx_word_mode3(struct spi_device *spi,
unsigned nsecs, u32 word, u8 bits, unsigned flags)
{
flags = spi->master->flags;
- return bitbang_txrx_be_cpha1(spi, nsecs, 1, flags, word, bits);
+ if (unlikely(spi->mode & SPI_LSB_FIRST))
+ return bitbang_txrx_le_cpha1(spi, nsecs, 1, flags, word, bits);
+ else
+ return bitbang_txrx_be_cpha1(spi, nsecs, 1, flags, word, bits);
}

/*----------------------------------------------------------------------*/
@@ -389,7 +413,7 @@ static int spi_gpio_probe(struct platform_device *pdev)

master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
master->mode_bits = SPI_3WIRE | SPI_3WIRE_HIZ | SPI_CPHA | SPI_CPOL |
- SPI_CS_HIGH;
+ SPI_CS_HIGH | SPI_LSB_FIRST;
if (!spi_gpio->mosi) {
/* HW configuration without MOSI pin
*
--
2.16.4
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