From: Michael Walle <michael@walle.cc>
Date: Wed, 11 May 2011 12:22:46 +0000 (+0000)
Subject: mvsata: issue hard reset on initialization
X-Git-Tag: v2011.06-rc2~7^2^2~29
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=70c55f5ab324d43093f1c8745462d92042b7306d;p=karo-tx-uboot.git

mvsata: issue hard reset on initialization

Before the actual initialization do a hard reset of the SATA port and the
connected device.

changes v1->v2:
 - add comment for udelay

Signed-off-by: Michael Walle <michael@walle.cc>
Cc: Prafulla Wadaskar <prafulla@marvell.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
---

diff --git a/drivers/block/mvsata_ide.c b/drivers/block/mvsata_ide.c
index e0e4097593..1be395fb45 100644
--- a/drivers/block/mvsata_ide.c
+++ b/drivers/block/mvsata_ide.c
@@ -33,7 +33,9 @@
 
 /* SATA port registers */
 struct mvsata_port_registers {
-	u32 reserved1[192];
+	u32 reserved0[10];
+	u32 edma_cmd;
+	u32 reserved1[181];
 	/* offset 0x300 : ATA Interface registers */
 	u32 sstatus;
 	u32 serror;
@@ -76,6 +78,7 @@ struct mvsata_port_registers {
  * and for SStatus DETection.
  */
 
+#define MVSATA_EDMA_CMD_ATA_RST		0x00000004
 #define MVSATA_SCONTROL_DET_MASK		0x0000000F
 #define MVSATA_SCONTROL_DET_NONE		0x00000000
 #define MVSATA_SCONTROL_DET_INIT		0x00000001
@@ -115,6 +118,11 @@ static int mvsata_ide_initialize_port(struct mvsata_port_registers *port)
 	u32 status;
 	u32 timeleft = 10000; /* wait at most 10 ms for SATA reset to complete */
 
+	/* Hard reset */
+	writel(MVSATA_EDMA_CMD_ATA_RST, &port->edma_cmd);
+	udelay(25); /* taken from original marvell port */
+	writel(0, &port->edma_cmd);
+
 	/* Set control IPM to 3 (no low power) and DET to 1 (initialize) */
 	control = readl(&port->scontrol);
 	control = (control & ~MVSATA_SCONTROL_MASK) | MVSATA_PORT_INIT;