[SCSI] ipr: add endian swap enablement for 64 bit adapters

A change in the hardware design of the chip for the new adapters changes the
default endianness of MMIO operations.  This patch adds a register definition
which when written to with a predefined value will change the endianness
back to what the driver expects.

This patch also fixes two problems found during testing.

First, the first reserved field in the ipr_hostrcb64_fabirc_desc structure only
reserved one byte.  The correct amount to reserve is 2 bytes.

Second, the reserved field of the ipr_hostrcb64_error structure only reserved
2 bytes.  The correct amount to reserve is 16 bytes.

Signed-off-by: Wayne Boyer <wayneb@linux.vnet.ibm.com>
Acked-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

2 files changed, 24 insertions, 4 deletions

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index f820cff..62bbe31 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -167,7 +167,8 @@ static const struct ipr_chip_cfg_t ipr_chip_cfg[] = {
 			.clr_uproc_interrupt_reg32 = 0x0002C,
 			.init_feedback_reg = 0x0005C,
 			.dump_addr_reg = 0x00064,
-			.dump_data_reg = 0x00068
+			.dump_data_reg = 0x00068,
+			.endian_swap_reg = 0x00084
 		}
 	},
 };
@@ -7208,6 +7209,12 @@ static int ipr_reset_enable_ioa(struct ipr_cmnd *ipr_cmd)
 	ipr_init_ioa_mem(ioa_cfg);
 
 	ioa_cfg->allow_interrupts = 1;
+	if (ioa_cfg->sis64) {
+		/* Set the adapter to the correct endian mode. */
+		writel(IPR_ENDIAN_SWAP_KEY, ioa_cfg->regs.endian_swap_reg);
+		int_reg = readl(ioa_cfg->regs.endian_swap_reg);
+	}
+
 	int_reg = readl(ioa_cfg->regs.sense_interrupt_reg32);
 
 	if (int_reg & IPR_PCII_IOA_TRANS_TO_OPER) {
@@ -7365,6 +7372,7 @@ static void ipr_get_unit_check_buffer(struct ipr_ioa_cfg *ioa_cfg)
 static int ipr_reset_restore_cfg_space(struct ipr_cmnd *ipr_cmd)
 {
 	struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;
+	volatile u32 int_reg;
 	int rc;
 
 	ENTER;
@@ -7383,6 +7391,12 @@ static int ipr_reset_restore_cfg_space(struct ipr_cmnd *ipr_cmd)
 
 	ipr_fail_all_ops(ioa_cfg);
 
+	if (ioa_cfg->sis64) {
+		/* Set the adapter to the correct endian mode. */
+		writel(IPR_ENDIAN_SWAP_KEY, ioa_cfg->regs.endian_swap_reg);
+		int_reg = readl(ioa_cfg->regs.endian_swap_reg);
+	}
+
 	if (ioa_cfg->ioa_unit_checked) {
 		ioa_cfg->ioa_unit_checked = 0;
 		ipr_get_unit_check_buffer(ioa_cfg);
@@ -7547,7 +7561,7 @@ static int ipr_reset_wait_to_start_bist(struct ipr_cmnd *ipr_cmd)
 }
 
 /**
- * ipr_reset_alert_part2 - Alert the adapter of a pending reset
+ * ipr_reset_alert - Alert the adapter of a pending reset
  * @ipr_cmd:	ipr command struct
  *
  * Description: This function alerts the adapter that it will be reset.
@@ -8318,6 +8332,7 @@ static void __devinit ipr_init_ioa_cfg(struct ipr_ioa_cfg *ioa_cfg,
 		t->init_feedback_reg = base + p->init_feedback_reg;
 		t->dump_addr_reg = base + p->dump_addr_reg;
 		t->dump_data_reg = base + p->dump_data_reg;
+		t->endian_swap_reg = base + p->endian_swap_reg;
 	}
 }
 
diff --git a/drivers/scsi/ipr.h b/drivers/scsi/ipr.h
index b965f35..ea391ff 100644
--- a/drivers/scsi/ipr.h
+++ b/drivers/scsi/ipr.h
@@ -996,7 +996,7 @@ struct ipr_hostrcb64_fabric_desc {
 	__be16 length;
 	u8 descriptor_id;
 
-	u8 reserved;
+	u8 reserved[2];
 	u8 path_state;
 
 	u8 reserved2[2];
@@ -1054,7 +1054,7 @@ struct ipr_hostrcb64_error {
 	__be64 fd_lun;
 	u8 fd_res_path[8];
 	__be64 time_stamp;
-	u8 reserved[2];
+	u8 reserved[16];
 	union {
 		struct ipr_hostrcb_type_ff_error type_ff_error;
 		struct ipr_hostrcb_type_12_error type_12_error;
@@ -1254,6 +1254,9 @@ struct ipr_interrupt_offsets {
 
 	unsigned long dump_addr_reg;
 	unsigned long dump_data_reg;
+
+#define IPR_ENDIAN_SWAP_KEY		0x000C0C00
+	unsigned long endian_swap_reg;
 };
 
 struct ipr_interrupts {
@@ -1279,6 +1282,8 @@ struct ipr_interrupts {
 
 	void __iomem *dump_addr_reg;
 	void __iomem *dump_data_reg;
+
+	void __iomem *endian_swap_reg;
 };
 
 struct ipr_chip_cfg_t {