spi: Remove the spi_set_speed and spi_cs_is_valid functions.

spi_set_speed was never implemented, and spi_cs_is_valid was only implemented
as a stub and never called.

BUG=None
TEST=Built for rambi, falco, and peach_pit.
BRANCH=None

Original-Change-Id: If30c2339f5e0360a5099eb540fab73fb23582905
Original-Signed-off-by: Gabe Black <gabeblack@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/192045
Original-Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Original-Tested-by: Gabe Black <gabeblack@chromium.org>
Original-Reviewed-by: David Hendricks <dhendrix@chromium.org>
Original-Commit-Queue: Gabe Black <gabeblack@chromium.org>
(cherry picked from commit 98c1f6014c)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: Iebdb2704ee81aee432c83ab182246d31ef52a6b6
Reviewed-on: http://review.coreboot.org/7707
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins)

src/include/spi-generic.h

@@ -116,15 +116,6 @@ void spi_release_bus(struct spi_slave *slave);
 int  spi_xfer(struct spi_slave *slave, const void *dout, unsigned int bytesout,
 		void *din, unsigned int bytesin);
 
-/*-----------------------------------------------------------------------
- * Determine if a SPI chipselect is valid.
- * This function is provided by the board if the low-level SPI driver
- * needs it to determine if a given chipselect is actually valid.
- *
- * Returns: 1 if bus:cs identifies a valid chip on this board, 0
- * otherwise.
- */
-int  spi_cs_is_valid(unsigned int bus, unsigned int cs);
 
 /*-----------------------------------------------------------------------
  * Activate a SPI chipselect.
@@ -144,14 +135,6 @@ void spi_cs_activate(struct spi_slave *slave);
  */
 void spi_cs_deactivate(struct spi_slave *slave);
 
-/*-----------------------------------------------------------------------
- * Set transfer speed.
- * This sets a new speed to be applied for next spi_xfer().
- *   slave:	The SPI slave
- *   hz:	The transfer speed
- */
-void spi_set_speed(struct spi_slave *slave, uint32_t hz);
-
 unsigned int spi_crop_chunk(unsigned int cmd_len, unsigned int buf_len);
 
 /*-----------------------------------------------------------------------

src/soc/intel/baytrail/spi.c

@@ -266,12 +266,6 @@ static void ich_set_bbar(uint32_t minaddr)
 	writel_(ichspi_bbar, cntlr.bbar);
 }
 
-int spi_cs_is_valid(unsigned int bus, unsigned int cs)
-{
-	printk(BIOS_DEBUG, "spi_cs_is_valid used but not implemented\n");
-	return 0;
-}
-
 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
 {
 	ich_spi_slave *slave = malloc(sizeof(*slave));

src/soc/intel/fsp_baytrail/spi.c

@@ -264,12 +264,6 @@ static void ich_set_bbar(uint32_t minaddr)
 	writel_(ichspi_bbar, cntlr.bbar);
 }
 
-int spi_cs_is_valid(unsigned int bus, unsigned int cs)
-{
-	printk(BIOS_DEBUG, "spi_cs_is_valid used but not implemented\n");
-	return 0;
-}
-
 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
 {
 	ich_spi_slave *slave = malloc(sizeof(*slave));

src/soc/samsung/exynos5420/spi.c

@@ -133,11 +133,6 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
 	return &eslave->slave;
 }
 
-int spi_cs_is_valid(unsigned int bus, unsigned int cs)
-{
-	return bus > 0 && bus < 3;
-}
-
 void spi_cs_activate(struct spi_slave *slave)
 {
 	struct exynos_spi *regs = to_exynos_spi(slave)->regs;

src/southbridge/intel/common/spi.c

@@ -293,12 +293,6 @@ static void ich_set_bbar(uint32_t minaddr)
 	writel_(ichspi_bbar, cntlr.bbar);
 }
 
-int spi_cs_is_valid(unsigned int bus, unsigned int cs)
-{
-	printk(BIOS_DEBUG, "spi_cs_is_valid used but not implemented\n");
-	return 0;
-}
-
 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
 {
 	ich_spi_slave *slave = malloc(sizeof(*slave));

src/southbridge/intel/fsp_rangeley/spi.c

@@ -329,12 +329,6 @@ static void ich_set_bbar(uint32_t minaddr)
 	writel_(ichspi_bbar, cntlr.bbar);
 }
 
-int spi_cs_is_valid(unsigned int bus, unsigned int cs)
-{
-	printk(BIOS_DEBUG, "spi_cs_is_valid used but not implemented\n");
-	return 0;
-}
-
 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
 {
 	ich_spi_slave *slave = malloc(sizeof(*slave));