southbridge/amd/sb700: Do drive detection even in AHCI mode

SeaBIOS AHCI drive detection randomly fails for drives present
on the secondary channel of each AHCI SATA BAR.  Forcing native
drive detection in AHCI mode resolves this issue.

Change-Id: I34eb1d5d3f2f8aefb749a4eeb911c1373d184938
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/11997
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

1 files changed, 53 insertions, 46 deletions

diff --git a/src/southbridge/amd/sb700/sata.c b/src/southbridge/amd/sb700/sata.c
index c61fa01953..ae4444600b 100644
--- a/src/southbridge/amd/sb700/sata.c
+++ b/src/southbridge/amd/sb700/sata.c
@@ -297,65 +297,72 @@ static void sata_init(struct device *dev)
 	if (port_count > max_port_count)
 		port_count = max_port_count;
 
-	if (!sata_ahci_mode) {
-		/* RPR7.7 SATA drive detection. */
-		/* Use BAR5+0x128,BAR0 for Primary Slave */
-		/* Use BAR5+0x1A8,BAR0 for Primary Slave */
-		/* Use BAR5+0x228,BAR2 for Secondary Master */
-		/* Use BAR5+0x2A8,BAR2 for Secondary Slave */
-		/* Use BAR5+0x328,PATA_BAR0/2 for Primary/Secondary Master emulation */
-		/* Use BAR5+0x3A8,PATA_BAR0/2 for Primary/Secondary Slave emulation */
-		for (i = 0; i < port_count; i++) {
+	/* RPR7.7 SATA drive detection. */
+	/* Use BAR5+0x128,BAR0 for Primary Slave */
+	/* Use BAR5+0x1A8,BAR0 for Primary Slave */
+	/* Use BAR5+0x228,BAR2 for Secondary Master */
+	/* Use BAR5+0x2A8,BAR2 for Secondary Slave */
+	/* Use BAR5+0x328,PATA_BAR0/2 for Primary/Secondary Master emulation */
+	/* Use BAR5+0x3A8,PATA_BAR0/2 for Primary/Secondary Slave emulation */
+	for (i = 0; i < port_count; i++) {
+		byte = read8(sata_bar5 + 0x128 + 0x80 * i);
+		printk(BIOS_SPEW, "SATA port %i status = %x\n", i, byte);
+		byte &= 0xF;
+		if (byte == 0x1) {
+			/* If the drive status is 0x1 then we see it but we aren't talking to it. */
+			/* Try to do something about it. */
+			printk(BIOS_SPEW, "SATA device detected but not talking. Trying lower speed.\n");
+
+			/* Read in Port-N Serial ATA Control Register */
+			byte = read8(sata_bar5 + 0x12C + 0x80 * i);
+
+			/* Set Reset Bit and 1.5g bit */
+			byte |= 0x11;
+			write8((sata_bar5 + 0x12C + 0x80 * i), byte);
+
+			/* Wait 1ms */
+			mdelay(1);
+
+			/* Clear Reset Bit */
+			byte &= ~0x01;
+			write8((sata_bar5 + 0x12C + 0x80 * i), byte);
+
+			/* Wait 1ms */
+			mdelay(1);
+
+			/* Reread status */
 			byte = read8(sata_bar5 + 0x128 + 0x80 * i);
 			printk(BIOS_SPEW, "SATA port %i status = %x\n", i, byte);
 			byte &= 0xF;
-			if (byte == 0x1) {
-				/* If the drive status is 0x1 then we see it but we aren't talking to it. */
-				/* Try to do something about it. */
-				printk(BIOS_SPEW, "SATA device detected but not talking. Trying lower speed.\n");
-
-				/* Read in Port-N Serial ATA Control Register */
-				byte = read8(sata_bar5 + 0x12C + 0x80 * i);
-
-				/* Set Reset Bit and 1.5g bit */
-				byte |= 0x11;
-				write8((sata_bar5 + 0x12C + 0x80 * i), byte);
-
-				/* Wait 1ms */
-				mdelay(1);
-
-				/* Clear Reset Bit */
-				byte &= ~0x01;
-				write8((sata_bar5 + 0x12C + 0x80 * i), byte);
-
-				/* Wait 1ms */
-				mdelay(1);
+		}
 
-				/* Reread status */
-				byte = read8(sata_bar5 + 0x128 + 0x80 * i);
-				printk(BIOS_SPEW, "SATA port %i status = %x\n", i, byte);
-				byte &= 0xF;
+		if (byte == 0x3) {
+			for (j = 0; j < 10; j++) {
+				if (i < 4)
+					current_bar = ((i / 2) == 0) ? sata_bar0 : sata_bar2;
+				else
+					current_bar = ide_bar0;
+				if (!sata_drive_detect(i, current_bar))
+					break;
 			}
-
-			if (byte == 0x3) {
-				for (j = 0; j < 10; j++) {
-					if (i < 4)
-						current_bar = ((i / 2) == 0) ? sata_bar0 : sata_bar2;
-					else
-						current_bar = ide_bar0;
-					if (!sata_drive_detect(i, current_bar))
-						break;
-				}
+			if (sata_ahci_mode)
+				printk(BIOS_DEBUG, "AHCI device %d is %sready after %i tries\n",
+						i,
+						(j == 10) ? "not " : "",
+						(j == 10) ? j : j + 1);
+			else
 				printk(BIOS_DEBUG, "%s %s device is %sready after %i tries\n",
 						(i / 2) ? "Secondary" : "Primary",
 						(i % 2 ) ? "Slave" : "Master",
 						(j == 10) ? "not " : "",
 						(j == 10) ? j : j + 1);
-			} else {
+		} else {
+			if (sata_ahci_mode)
+				printk(BIOS_DEBUG, "No AHCI SATA drive on Slot%i\n", i);
+			else
 				printk(BIOS_DEBUG, "No %s %s SATA drive on Slot%i\n",
 						(i / 2) ? "Secondary" : "Primary",
 						(i % 2 ) ? "Slave" : "Master", i);
-			}
 		}
 	}