[PATCH 3/4] drivers: fpga: Check bitstream address doesn't exceed 512MB

[Naresh Kumar Ravulapalli]

Secure Device Manager(SDM) has only 512MB window address space to
HPS over PSI BE link. The default access range is 0x0 to 0x1FFFFFFF.
To allow SDM accessing the address space more than 512MB, SMMU has
to be setup for address translation.

A conditional check is added to not allow the fpga reconfiguration
for any bitstream data where address exceeds 512MB, unless
PSI BE link address translation is setup in SMMU.

Signed-off-by: Naresh Kumar Ravulapalli <nareshkumar.ravulapalli at altera.com>
---
 arch/arm/mach-socfpga/include/mach/smmu_s10.h |  6 ++++++
 drivers/fpga/intel_sdm_mb.c                   | 13 +++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/arch/arm/mach-socfpga/include/mach/smmu_s10.h b/arch/arm/mach-socfpga/include/mach/smmu_s10.h
index 209caa86e38..d611664e227 100644
--- a/arch/arm/mach-socfpga/include/mach/smmu_s10.h
+++ b/arch/arm/mach-socfpga/include/mach/smmu_s10.h
@@ -30,6 +30,12 @@
 
 #define SMMU_SID_SDM2HPS_PSI_BE		0
 
+#define SDM2HPS_PSI_BE_ADDR_BASE	0
+/* PSI BE 512MB address window */
+#define SDM2HPS_PSI_BE_WINDOW_SZ	0x20000000
+#define SDM2HPS_PSI_BE_ADDR_END		\
+	(SDM2HPS_PSI_BE_ADDR_BASE + SDM2HPS_PSI_BE_WINDOW_SZ - 1)
+
 void socfpga_init_smmu(void);
 int is_smmu_bypass(void);
 int is_smmu_stream_id_enabled(u32 stream_id);
diff --git a/drivers/fpga/intel_sdm_mb.c b/drivers/fpga/intel_sdm_mb.c
index 5f4aae47d6d..1bbb717015b 100644
--- a/drivers/fpga/intel_sdm_mb.c
+++ b/drivers/fpga/intel_sdm_mb.c
@@ -10,6 +10,7 @@
 #include <watchdog.h>
 #include <asm/arch/mailbox_s10.h>
 #include <asm/arch/smc_api.h>
+#include <asm/arch/smmu_s10.h>
 #include <asm/cache.h>
 #include <cpu_func.h>
 #include <linux/delay.h>
@@ -1031,6 +1032,18 @@ int intel_sdm_mb_load(Altera_desc *desc, const void *rbf_data, size_t rbf_size)
 
 	flush_dcache_range((unsigned long)rbf_data, (unsigned long)(rbf_data + rbf_size));
 
+	/*
+	 * Don't start the FPGA reconfiguration if bitstream location exceed the
+	 * PSI BE 512MB address window and SMMU is not setup for PSI BE address
+	 * translation.
+	 */
+	if (((u64)rbf_data + rbf_size) >= SDM2HPS_PSI_BE_ADDR_END &&
+	    !is_smmu_stream_id_enabled(SMMU_SID_SDM2HPS_PSI_BE)) {
+		printf("Failed: Bitstream location must not exceed 0x%08x\n",
+		       SDM2HPS_PSI_BE_ADDR_END);
+		return -EINVAL;
+	}
+
 	debug("Sending MBOX_RECONFIG...\n");
 	ret = mbox_send_cmd(MBOX_ID_UBOOT, MBOX_RECONFIG, MBOX_CMD_DIRECT, 0,
 			    NULL, 0, &resp_len, resp_buf);
-- 
2.35.3