spi: Make default cmd helpers static internal

Avoid these leaking into driver implementations as a NULL
field now implies their implementation. This removes one
source of a driver bug where both `mst->command` AND
`mst->multicommand` are set to default implementations
which is actually a cyclical control flow condition.

The driver however must still have either `mst->command` OR
`mst->multicommand` defined and so both cannot be NULL.

This simplifies the code and driver development.

Change-Id: I4ef95846c2f005cf4aa727f31548c6877d2d4801
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/73337
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Thomas Heijligen <src@posteo.de>
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
---
M include/programmer.h
M spi.c
2 files changed, 44 insertions(+), 23 deletions(-)

diff --git a/include/programmer.h b/include/programmer.h
index f72f1d7..f6bc8ce 100644
--- a/include/programmer.h
+++ b/include/programmer.h
@@ -318,9 +318,6 @@
 	void *data;
 };
 
-int default_spi_send_command(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
-			     const unsigned char *writearr, unsigned char *readarr);
-int default_spi_send_multicommand(const struct flashctx *flash, struct spi_command *cmds);
 int default_spi_read(struct flashctx *flash, uint8_t *buf, unsigned int start, unsigned int len);
 int default_spi_write_256(struct flashctx *flash, const uint8_t *buf, unsigned int start, unsigned int len);
 int default_spi_write_aai(struct flashctx *flash, const uint8_t *buf, unsigned int start, unsigned int len);
diff --git a/spi.c b/spi.c
index 4fe0fa5..3b3f622 100644
--- a/spi.c
+++ b/spi.c
@@ -26,23 +26,7 @@
 #include "programmer.h"
 #include "spi.h"
 
-int spi_send_command(const struct flashctx *flash, unsigned int writecnt,
-		     unsigned int readcnt, const unsigned char *writearr,
-		     unsigned char *readarr)
-{
-	if (flash->mst->spi.command)
-		return flash->mst->spi.command(flash, writecnt, readcnt, writearr, readarr);
-	return default_spi_send_command(flash, writecnt, readcnt, writearr, readarr);
-}
-
-int spi_send_multicommand(const struct flashctx *flash, struct spi_command *cmds)
-{
-	if (flash->mst->spi.multicommand)
-		return flash->mst->spi.multicommand(flash, cmds);
-	return default_spi_send_multicommand(flash, cmds);
-}
-
-int default_spi_send_command(const struct flashctx *flash, unsigned int writecnt,
+static int default_spi_send_command(const struct flashctx *flash, unsigned int writecnt,
 			     unsigned int readcnt,
 			     const unsigned char *writearr,
 			     unsigned char *readarr)
@@ -63,7 +47,7 @@
 	return spi_send_multicommand(flash, cmd);
 }
 
-int default_spi_send_multicommand(const struct flashctx *flash,
+static int default_spi_send_multicommand(const struct flashctx *flash,
 				  struct spi_command *cmds)
 {
 	int result = 0;
@@ -74,6 +58,22 @@
 	return result;
 }
 
+int spi_send_command(const struct flashctx *flash, unsigned int writecnt,
+		     unsigned int readcnt, const unsigned char *writearr,
+		     unsigned char *readarr)
+{
+	if (flash->mst->spi.command)
+		return flash->mst->spi.command(flash, writecnt, readcnt, writearr, readarr);
+	return default_spi_send_command(flash, writecnt, readcnt, writearr, readarr);
+}
+
+int spi_send_multicommand(const struct flashctx *flash, struct spi_command *cmds)
+{
+	if (flash->mst->spi.multicommand)
+		return flash->mst->spi.multicommand(flash, cmds);
+	return default_spi_send_multicommand(flash, cmds);
+}
+
 int default_spi_read(struct flashctx *flash, uint8_t *buf, unsigned int start,
 		     unsigned int len)
 {
@@ -156,8 +156,7 @@
 	}
 
 	if (!mst->write_256 || !mst->read || !mst->probe_opcode ||
-	    ((mst->command == default_spi_send_command || !mst->command) &&
-	     (mst->multicommand == default_spi_send_multicommand || !mst->multicommand))) {
+	    (!mst->command && !mst->multicommand)) {
 		msg_perr("%s called with incomplete master definition. "
 			 "Please report a bug at flashrom@flashrom.org\n",
 			 __func__);

