spi: reorganize drivers

Sort the SPI makefile and enforce the naming convention spi_*.c for
spi drivers.

This change also rolls the contents of atmel_spi.h into the .c file
since there is only one user of that particular include file.

v2: - Use 'spi-' prefix instead of 'spi_' to match what seems to be
      be the predominant pattern for subsystem prefixes.
    - Clean up filenames in Kconfig and header comment blocks

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 0 insertions, 97 deletions

diff --git a/drivers/spi/spi_bitbang_txrx.h b/drivers/spi/spi_bitbang_txrx.h
deleted file mode 100644
index c16bf853c3eb..000000000000
--- a/drivers/spi/spi_bitbang_txrx.h
+++ /dev/null
@@ -1,97 +0,0 @@
-/*
- * Mix this utility code with some glue code to get one of several types of
- * simple SPI master driver.  Two do polled word-at-a-time I/O:
- *
- *   -	GPIO/parport bitbangers.  Provide chipselect() and txrx_word[](),
- *	expanding the per-word routines from the inline templates below.
- *
- *   -	Drivers for controllers resembling bare shift registers.  Provide
- *	chipselect() and txrx_word[](), with custom setup()/cleanup() methods
- *	that use your controller's clock and chipselect registers.
- *
- * Some hardware works well with requests at spi_transfer scope:
- *
- *   -	Drivers leveraging smarter hardware, with fifos or DMA; or for half
- *	duplex (MicroWire) controllers.  Provide chipselect() and txrx_bufs(),
- *	and custom setup()/cleanup() methods.
- */
-
-/*
- * The code that knows what GPIO pins do what should have declared four
- * functions, ideally as inlines, before including this header:
- *
- *  void setsck(struct spi_device *, int is_on);
- *  void setmosi(struct spi_device *, int is_on);
- *  int getmiso(struct spi_device *);
- *  void spidelay(unsigned);
- *
- * setsck()'s is_on parameter is a zero/nonzero boolean.
- *
- * setmosi()'s is_on parameter is a zero/nonzero boolean.
- *
- * getmiso() is required to return 0 or 1 only. Any other value is invalid
- * and will result in improper operation.
- *
- * A non-inlined routine would call bitbang_txrx_*() routines.  The
- * main loop could easily compile down to a handful of instructions,
- * especially if the delay is a NOP (to run at peak speed).
- *
- * Since this is software, the timings may not be exactly what your board's
- * chips need ... there may be several reasons you'd need to tweak timings
- * in these routines, not just make to make it faster or slower to match a
- * particular CPU clock rate.
- */
-
-static inline u32
-bitbang_txrx_be_cpha0(struct spi_device *spi,
-		unsigned nsecs, unsigned cpol, unsigned flags,
-		u32 word, u8 bits)
-{
-	/* if (cpol == 0) this is SPI_MODE_0; else this is SPI_MODE_2 */
-
-	/* clock starts at inactive polarity */
-	for (word <<= (32 - bits); likely(bits); bits--) {
-
-		/* setup MSB (to slave) on trailing edge */
-		if ((flags & SPI_MASTER_NO_TX) == 0)
-			setmosi(spi, word & (1 << 31));
-		spidelay(nsecs);	/* T(setup) */
-
-		setsck(spi, !cpol);
-		spidelay(nsecs);
-
-		/* sample MSB (from slave) on leading edge */
-		word <<= 1;
-		if ((flags & SPI_MASTER_NO_RX) == 0)
-			word |= getmiso(spi);
-		setsck(spi, cpol);
-	}
-	return word;
-}
-
-static inline u32
-bitbang_txrx_be_cpha1(struct spi_device *spi,
-		unsigned nsecs, unsigned cpol, unsigned flags,
-		u32 word, u8 bits)
-{
-	/* if (cpol == 0) this is SPI_MODE_1; else this is SPI_MODE_3 */
-
-	/* clock starts at inactive polarity */
-	for (word <<= (32 - bits); likely(bits); bits--) {
-
-		/* setup MSB (to slave) on leading edge */
-		setsck(spi, !cpol);
-		if ((flags & SPI_MASTER_NO_TX) == 0)
-			setmosi(spi, word & (1 << 31));
-		spidelay(nsecs); /* T(setup) */
-
-		setsck(spi, cpol);
-		spidelay(nsecs);
-
-		/* sample MSB (from slave) on trailing edge */
-		word <<= 1;
-		if ((flags & SPI_MASTER_NO_RX) == 0)
-			word |= getmiso(spi);
-	}
-	return word;
-}