[SCSI] Add spi_populate_*_msg functions

Introduce new helpers:
 - spi_populate_width_msg()
 - spi_populate_sync_msg()
 - spi_populate_ppr_msg()

and use them in drivers which already enable the SPI transport.

Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c
index 97f4be62f748..c0051a432a97 100644
--- a/drivers/scsi/scsi_transport_spi.c
+++ b/drivers/scsi/scsi_transport_spi.c
@@ -1051,6 +1051,39 @@ void spi_display_xfer_agreement(struct scsi_target *starget)
 }
 EXPORT_SYMBOL(spi_display_xfer_agreement);
 
+int spi_populate_width_msg(unsigned char *msg, int width)
+{
+        msg[0] = EXTENDED_MESSAGE;
+        msg[1] = 2;
+        msg[2] = EXTENDED_WDTR;
+        msg[3] = width;
+        return 4;
+}
+
+int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
+{
+        msg[0] = EXTENDED_MESSAGE;
+        msg[1] = 3;
+        msg[2] = EXTENDED_SDTR;
+        msg[3] = period;
+        msg[4] = offset;
+        return 5;
+}
+
+int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
+                int width, int options)
+{
+        msg[0] = EXTENDED_MESSAGE;
+        msg[1] = 6;
+        msg[2] = EXTENDED_PPR;
+        msg[3] = period;
+        msg[4] = 0;
+        msg[5] = offset;
+        msg[6] = width;
+        msg[7] = options;
+        return 8;
+}
+
 #ifdef CONFIG_SCSI_CONSTANTS
 static const char * const one_byte_msgs[] = {
 /* 0x00 */ "Command Complete", NULL, "Save Pointers",