--- /dev/null
+/*
+ * 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,
+ 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 */
+ setmosi(spi, word & (1 << 31));
+ spidelay(nsecs); /* T(setup) */
+
+ setsck(spi, !cpol);
+ spidelay(nsecs);
+
+ /* sample MSB (from slave) on leading edge */
+ word <<= 1;
+ word |= getmiso(spi);
+ setsck(spi, cpol);
+ }
+ return word;
+}
+
+static inline u32
+bitbang_txrx_be_cpha1(struct spi_device *spi,
+ unsigned nsecs, unsigned cpol,
+ 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);
+ setmosi(spi, word & (1 << 31));
+ spidelay(nsecs); /* T(setup) */
+
+ setsck(spi, cpol);
+ spidelay(nsecs);
+
+ /* sample MSB (from slave) on trailing edge */
+ word <<= 1;
+ word |= getmiso(spi);
+ }
+ return word;
+}
#define spidelay(X) do{}while(0)
//#define spidelay ndelay
-#define EXPAND_BITBANG_TXRX
-#include <linux/spi/spi_bitbang.h>
+#include "spi_bitbang_txrx.h"
static u32
butterfly_txrx_word_mode0(struct spi_device *spi,
*/
#define spidelay(nsecs) do {} while (0)
-#define EXPAND_BITBANG_TXRX
-#include <linux/spi/spi_bitbang.h>
+#include "spi_bitbang_txrx.h"
/*
* These functions can leverage inline expansion of GPIO calls to shrink
}
/*--------------------------------------------------------------------*/
-#define EXPAND_BITBANG_TXRX 1
-#include <linux/spi/spi_bitbang.h>
+#include "spi_bitbang_txrx.h"
static void lm70_chipselect(struct spi_device *spi, int value)
{
#define spidelay(x) ndelay(x)
-#define EXPAND_BITBANG_TXRX
-#include <linux/spi/spi_bitbang.h>
+#include "spi_bitbang_txrx.h"
static u32 s3c2410_spigpio_txrx_mode0(struct spi_device *spi,
#define spidelay(x) ndelay(x)
-#define EXPAND_BITBANG_TXRX
-#include <linux/spi/spi_bitbang.h>
+#include "spi_bitbang_txrx.h"
static u32 sh_sci_spi_txrx_mode0(struct spi_device *spi,
unsigned nsecs, u32 word, u8 bits)
#ifndef __SPI_BITBANG_H
#define __SPI_BITBANG_H
-/*
- * 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.
- */
-
#include <linux/workqueue.h>
struct spi_bitbang {
extern int spi_bitbang_stop(struct spi_bitbang *spi);
#endif /* __SPI_BITBANG_H */
-
-/*-------------------------------------------------------------------------*/
-
-#ifdef EXPAND_BITBANG_TXRX
-
-/*
- * The code that knows what GPIO pins do what should have declared four
- * functions, ideally as inlines, before #defining EXPAND_BITBANG_TXRX
- * and 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,
- 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 */
- setmosi(spi, word & (1 << 31));
- spidelay(nsecs); /* T(setup) */
-
- setsck(spi, !cpol);
- spidelay(nsecs);
-
- /* sample MSB (from slave) on leading edge */
- word <<= 1;
- word |= getmiso(spi);
- setsck(spi, cpol);
- }
- return word;
-}
-
-static inline u32
-bitbang_txrx_be_cpha1(struct spi_device *spi,
- unsigned nsecs, unsigned cpol,
- 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);
- setmosi(spi, word & (1 << 31));
- spidelay(nsecs); /* T(setup) */
-
- setsck(spi, cpol);
- spidelay(nsecs);
-
- /* sample MSB (from slave) on trailing edge */
- word <<= 1;
- word |= getmiso(spi);
- }
- return word;
-}
-
-#endif /* EXPAND_BITBANG_TXRX */
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff