scsi: pm80xx: Handle non-fatal errors

Firmware expects host driver to clear scratchpad rsvd 0 register after
non-fatal error is found.

This is done when firmware raises fatal error interrupt and indicates
non-fatal error. At this point firmware updates scratchpad rsvd 0 register
with non-fatal error value. Here host has to clear the register after
reading it during non-fatal errors.

Rename:

 - MSGU_HOST_SCRATCH_PAD_6 to MSGU_SCRATCH_PAD_RSVD_0

 - MSGU_HOST_SCRATCH_PAD_7 to MSGU_SCRATCH_PAD_RSVD_1

Link: https://lore.kernel.org/r/20220222092618.108198-1-Ajish.Koshy@microchip.comReviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Acked-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Ajish Koshy <Ajish.Koshy@microchip.com>
Signed-off-by: Viswas G <Viswas.G@microchip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/pm8001/pm80xx_hwi.c

@@ -1544,9 +1544,9 @@ pm80xx_fatal_errors(struct pm8001_hba_info *pm8001_ha)
 {
 	int ret = 0;
 	u32 scratch_pad_rsvd0 = pm8001_cr32(pm8001_ha, 0,
-					MSGU_HOST_SCRATCH_PAD_6);
+					    MSGU_SCRATCH_PAD_RSVD_0);
 	u32 scratch_pad_rsvd1 = pm8001_cr32(pm8001_ha, 0,
-					MSGU_HOST_SCRATCH_PAD_7);
+					    MSGU_SCRATCH_PAD_RSVD_1);
 	u32 scratch_pad1 = pm8001_cr32(pm8001_ha, 0, MSGU_SCRATCH_PAD_1);
 	u32 scratch_pad2 = pm8001_cr32(pm8001_ha, 0, MSGU_SCRATCH_PAD_2);
 	u32 scratch_pad3 = pm8001_cr32(pm8001_ha, 0, MSGU_SCRATCH_PAD_3);
@@ -1655,9 +1655,9 @@ pm80xx_chip_soft_rst(struct pm8001_hba_info *pm8001_ha)
 			PCI_VENDOR_ID_ATTO &&
 			pm8001_ha->pdev->subsystem_vendor != 0) {
 			ibutton0 = pm8001_cr32(pm8001_ha, 0,
-					MSGU_HOST_SCRATCH_PAD_6);
+					       MSGU_SCRATCH_PAD_RSVD_0);
 			ibutton1 = pm8001_cr32(pm8001_ha, 0,
-					MSGU_HOST_SCRATCH_PAD_7);
+					       MSGU_SCRATCH_PAD_RSVD_1);
 			if (!ibutton0 && !ibutton1) {
 				pm8001_dbg(pm8001_ha, FAIL,
 					   "iButton Feature is not Available!!!\n");
@@ -4064,9 +4064,9 @@ static void print_scratchpad_registers(struct pm8001_hba_info *pm8001_ha)
 	pm8001_dbg(pm8001_ha, FAIL, "MSGU_HOST_SCRATCH_PAD_5: 0x%x\n",
 		   pm8001_cr32(pm8001_ha, 0, MSGU_HOST_SCRATCH_PAD_5));
 	pm8001_dbg(pm8001_ha, FAIL, "MSGU_RSVD_SCRATCH_PAD_0: 0x%x\n",
-		   pm8001_cr32(pm8001_ha, 0, MSGU_HOST_SCRATCH_PAD_6));
+		   pm8001_cr32(pm8001_ha, 0, MSGU_SCRATCH_PAD_RSVD_0));
 	pm8001_dbg(pm8001_ha, FAIL, "MSGU_RSVD_SCRATCH_PAD_1: 0x%x\n",
-		   pm8001_cr32(pm8001_ha, 0, MSGU_HOST_SCRATCH_PAD_7));
+		   pm8001_cr32(pm8001_ha, 0, MSGU_SCRATCH_PAD_RSVD_1));
 }
 
 static int process_oq(struct pm8001_hba_info *pm8001_ha, u8 vec)
@@ -4100,6 +4100,22 @@ static int process_oq(struct pm8001_hba_info *pm8001_ha, u8 vec)
 			pm8001_handle_event(pm8001_ha, NULL, IO_FATAL_ERROR);
 			print_scratchpad_registers(pm8001_ha);
 			return ret;
+		} else {
+			/*read scratchpad rsvd 0 register*/
+			regval = pm8001_cr32(pm8001_ha, 0,
+					     MSGU_SCRATCH_PAD_RSVD_0);
+			switch (regval) {
+			case NON_FATAL_SPBC_LBUS_ECC_ERR:
+			case NON_FATAL_BDMA_ERR:
+			case NON_FATAL_THERM_OVERTEMP_ERR:
+				/*Clear the register*/
+				pm8001_cw32(pm8001_ha, 0,
+					    MSGU_SCRATCH_PAD_RSVD_0,
+					    0x00000000);
+				break;
+			default:
+				break;
+			}
 		}
 	}
 	circularQ = &pm8001_ha->outbnd_q_tbl[vec];

drivers/scsi/pm8001/pm80xx_hwi.h

@@ -1366,8 +1366,8 @@ typedef struct SASProtocolTimerConfig SASProtocolTimerConfig_t;
 #define MSGU_HOST_SCRATCH_PAD_3			0x60
 #define MSGU_HOST_SCRATCH_PAD_4			0x64
 #define MSGU_HOST_SCRATCH_PAD_5			0x68
-#define MSGU_HOST_SCRATCH_PAD_6			0x6C
-#define MSGU_HOST_SCRATCH_PAD_7			0x70
+#define MSGU_SCRATCH_PAD_RSVD_0			0x6C
+#define MSGU_SCRATCH_PAD_RSVD_1			0x70
 
 #define MSGU_SCRATCHPAD1_RAAE_STATE_ERR(x) ((x & 0x3) == 0x2)
 #define MSGU_SCRATCHPAD1_ILA_STATE_ERR(x) (((x >> 2) & 0x3) == 0x2)
@@ -1439,6 +1439,11 @@ typedef struct SASProtocolTimerConfig SASProtocolTimerConfig_t;
 #define SCRATCH_PAD_ERROR_MASK		0xFFFFFC00 /* Error mask bits */
 #define SCRATCH_PAD_STATE_MASK		0x00000003 /* State Mask bits */
 
+/*state definition for Scratchpad Rsvd 0, Offset 0x6C, Non-fatal*/
+#define NON_FATAL_SPBC_LBUS_ECC_ERR	0x70000001
+#define NON_FATAL_BDMA_ERR		0xE0000001
+#define NON_FATAL_THERM_OVERTEMP_ERR	0x80000001
+
 /* main configuration offset - byte offset */
 #define MAIN_SIGNATURE_OFFSET		0x00 /* DWORD 0x00 */
 #define MAIN_INTERFACE_REVISION		0x04 /* DWORD 0x01 */