mfd: intel-m10-bmc: Change staging size to a variable

The secure update driver does a sanity-check of the image size in
comparison to the size of the staging area in FLASH. Instead of
hard-wiring M10BMC_STAGING_SIZE, move the staging size to the
m10bmc_csr_map structure to make the size assignment more flexible.
Co-developed-by: Russ Weight <russell.h.weight@intel.com>
Signed-off-by: Russ Weight <russell.h.weight@intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Peter Colberg <peter.colberg@intel.com>
Reviewed-by: Xu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/20240402184925.1065932-1-peter.colberg@intel.comSigned-off-by: Lee Jones <lee@kernel.org>

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

@@ -529,11 +529,12 @@ static enum fw_upload_err m10bmc_sec_prepare(struct fw_upload *fwl,
 					     const u8 *data, u32 size)
 {
 	struct m10bmc_sec *sec = fwl->dd_handle;
+	const struct m10bmc_csr_map *csr_map = sec->m10bmc->info->csr_map;
 	u32 ret;
 
 	sec->cancel_request = false;
 
-	if (!size || size > M10BMC_STAGING_SIZE)
+	if (!size || size > csr_map->staging_size)
 		return FW_UPLOAD_ERR_INVALID_SIZE;
 
 	if (sec->m10bmc->flash_bulk_ops)

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

@@ -370,6 +370,7 @@ static const struct m10bmc_csr_map m10bmc_n6000_csr_map = {
 	.pr_reh_addr = M10BMC_N6000_PR_REH_ADDR,
 	.pr_magic = M10BMC_N6000_PR_PROG_MAGIC,
 	.rsu_update_counter = M10BMC_N6000_STAGING_FLASH_COUNT,
+	.staging_size = M10BMC_STAGING_SIZE,
 };
 
 static const struct intel_m10bmc_platform_info m10bmc_pmci_n6000 = {

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

@@ -109,6 +109,7 @@ static const struct m10bmc_csr_map m10bmc_n3000_csr_map = {
 	.pr_reh_addr = M10BMC_N3000_PR_REH_ADDR,
 	.pr_magic = M10BMC_N3000_PR_PROG_MAGIC,
 	.rsu_update_counter = M10BMC_N3000_STAGING_FLASH_COUNT,
+	.staging_size = M10BMC_STAGING_SIZE,
 };
 
 static struct mfd_cell m10bmc_d5005_subdevs[] = {

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

@@ -205,6 +205,7 @@ struct m10bmc_csr_map {
 	unsigned int pr_reh_addr;
 	unsigned int pr_magic;
 	unsigned int rsu_update_counter;
+	unsigned int staging_size;
 };
 
 /**