mfd: intel-m10-bmc: Create m10bmc_sys_update_bits()

Wrap regmap_update_bits() with m10bmc_sys_update_bits() in order to be
able to add additional checks into it.

Co-developed-by: Russ Weight <[e-mail]>
Signed-off-by: Russ Weight <[e-mail]>
Signed-off-by: Ilpo Järvinen <[e-mail]>
Reviewed-by: Xu Yilun <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/fpga/intel-m10-bmc-sec-update.c

···
 	u32 doorbell_reg, progress, status;
 	int ret, err;
 
-	ret = regmap_update_bits(sec->m10bmc->regmap,
-				 csr_map->base + csr_map->doorbell,
-				 DRBL_RSU_REQUEST | DRBL_HOST_STATUS,
-				 DRBL_RSU_REQUEST |
-				 FIELD_PREP(DRBL_HOST_STATUS,
-					    HOST_STATUS_IDLE));
+	ret = m10bmc_sys_update_bits(sec->m10bmc, csr_map->doorbell,
+				     DRBL_RSU_REQUEST | DRBL_HOST_STATUS,
+				     DRBL_RSU_REQUEST |
+				     FIELD_PREP(DRBL_HOST_STATUS,
+						HOST_STATUS_IDLE));
 	if (ret)
 		return FW_UPLOAD_ERR_RW_ERROR;
 
···
 	u32 doorbell_reg, status;
 	int ret;
 
-	ret = regmap_update_bits(sec->m10bmc->regmap,
-				 csr_map->base + csr_map->doorbell,
-				 DRBL_HOST_STATUS,
-				 FIELD_PREP(DRBL_HOST_STATUS,
-					    HOST_STATUS_WRITE_DONE));
+	ret = m10bmc_sys_update_bits(sec->m10bmc, csr_map->doorbell,
+				     DRBL_HOST_STATUS,
+				     FIELD_PREP(DRBL_HOST_STATUS,
+						HOST_STATUS_WRITE_DONE));
 	if (ret)
 		return FW_UPLOAD_ERR_RW_ERROR;
 
···
 	if (rsu_prog(doorbell) != RSU_PROG_READY)
 		return FW_UPLOAD_ERR_BUSY;
 
-	ret = regmap_update_bits(sec->m10bmc->regmap,
-				 csr_map->base + csr_map->doorbell,
-				 DRBL_HOST_STATUS,
-				 FIELD_PREP(DRBL_HOST_STATUS,
-					    HOST_STATUS_ABORT_RSU));
+	ret = m10bmc_sys_update_bits(sec->m10bmc, csr_map->doorbell,
+				     DRBL_HOST_STATUS,
+				     FIELD_PREP(DRBL_HOST_STATUS,
+						HOST_STATUS_ABORT_RSU));
 	if (ret)
 		return FW_UPLOAD_ERR_RW_ERROR;
 
···
 MODULE_AUTHOR("Intel Corporation");
 MODULE_DESCRIPTION("Intel MAX10 BMC Secure Update");
 MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(INTEL_M10_BMC_CORE);

drivers/mfd/intel-m10-bmc-core.c

···
 #include <linux/mfd/intel-m10-bmc.h>
 #include <linux/module.h>
 
+int m10bmc_sys_update_bits(struct intel_m10bmc *m10bmc, unsigned int offset,
+			   unsigned int msk, unsigned int val)
+{
+	const struct m10bmc_csr_map *csr_map = m10bmc->info->csr_map;
+
+	return regmap_update_bits(m10bmc->regmap, csr_map->base + offset, msk, val);
+}
+EXPORT_SYMBOL_NS_GPL(m10bmc_sys_update_bits, INTEL_M10_BMC_CORE);
+
 static ssize_t bmc_version_show(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {

include/linux/mfd/intel-m10-bmc.h

···
  *
  * m10bmc_raw_read - read m10bmc register per addr
  * m10bmc_sys_read - read m10bmc system register per offset
+ * m10bmc_sys_update_bits - update m10bmc system register per offset
  */
 static inline int
 m10bmc_raw_read(struct intel_m10bmc *m10bmc, unsigned int addr,
···
 
 	return m10bmc_raw_read(m10bmc, csr_map->base + offset, val);
 }
+
+int m10bmc_sys_update_bits(struct intel_m10bmc *m10bmc, unsigned int offset,
+			   unsigned int msk, unsigned int val);
 
 /*
  * MAX10 BMC Core support