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From: Yang, Bo on 5 Aug 2010 16:00
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(a)lsi.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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