linux-kernel - [PATCH 3/12] scsi: megaraid_sas - Online Controller Reset - III: add the reset function for Gen2 related chip

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Date:	Thu, 5 Aug 2010 13:57:25 -0600
From:	"Yang, Bo" <Bo.Yang@....com>
To:	"Yang, Bo" <Bo.Yang@....com>,
	"'James.Bottomley@...senPartnership.com'" 
	<James.Bottomley@...senPartnership.com>,
	"'James.Bottomley@...e.de'" <James.Bottomley@...e.de>
CC:	"'linux-scsi@...r.kernel.org'" <linux-scsi@...r.kernel.org>,
	"'akpm@...l.org'" <akpm@...l.org>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"Daftardar, Jayant" <Jayant.Daftardar@....com>
Subject: [PATCH 3/12] scsi: megaraid_sas - Online Controller Reset - III:
 add the reset function for Gen2 related chip

Re-submitted requested by James Bottomley.

Add the gen2 chip reset functions to the driver.  Driver will write the gen2 chip register offset to force the controller to reset.

Signed-off-by Bo Yang<bo.yang@....com>

---
drivers/scsi/megaraid/megaraid_sas.c |   41 +++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff -rupN old/drivers/scsi/megaraid/megaraid_sas.c new/drivers/scsi/megaraid/megaraid_sas.c
--- old/drivers/scsi/megaraid/megaraid_sas.c	2010-06-08 14:38:29.000000000 -0400
+++ new/drivers/scsi/megaraid/megaraid_sas.c	2010-06-08 14:38:43.000000000 -0400
@@ -662,6 +662,47 @@ static int
 megasas_adp_reset_gen2(struct megasas_instance *instance,
 			struct megasas_register_set __iomem *reg_set)
 {
+	u32			retry = 0 ;
+	u32			HostDiag;
+
+	writel(0, &reg_set->seq_offset);
+	writel(4, &reg_set->seq_offset);
+	writel(0xb, &reg_set->seq_offset);
+	writel(2, &reg_set->seq_offset);
+	writel(7, &reg_set->seq_offset);
+	writel(0xd, &reg_set->seq_offset);
+	msleep(1000);
+
+	HostDiag = (u32)readl(&reg_set->host_diag);
+
+	while ( !( HostDiag & DIAG_WRITE_ENABLE) ) {
+		msleep(100);
+		HostDiag = (u32)readl(&reg_set->host_diag);
+		printk(KERN_NOTICE "RESETGEN2: retry=%x, hostdiag=%x\n",
+					retry, HostDiag);
+
+		if (retry++ >= 100)
+			return 1;
+
+	}
+
+	printk(KERN_NOTICE "ADP_RESET_GEN2: HostDiag=%x\n", HostDiag);
+
+	writel((HostDiag | DIAG_RESET_ADAPTER), &reg_set->host_diag);
+
+	ssleep(10);
+
+	HostDiag = (u32)readl(&reg_set->host_diag);
+	while ( ( HostDiag & DIAG_RESET_ADAPTER) ) {
+		msleep(100);
+		HostDiag = (u32)readl(&reg_set->host_diag);
+		printk(KERN_NOTICE "RESET_GEN2: retry=%x, hostdiag=%x\n",
+				retry, HostDiag);
+
+		if (retry++ >= 1000)
+			return 1;
+
+	}
 	return 0;
 }

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