msm: camera: smmu: Move to ioremap APIs for using FW memory

When loading the camera FW, use the appropriate APIs
depending on the kernel version to map the FW region.

CRs-Fixed: 2564857
Change-Id: I2104b63b54bce799c8e44f36c49042de86f78c7e
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
Signed-off-by: Karthik Jayakumar <kjayakum@codeaurora.org>

drivers/cam_utils/cam_compat.c

@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2014-2019, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/of_address.h>
+
+#include "cam_compat.h"
+#include "cam_debug_util.h"
+
+#if KERNEL_VERSION(5, 4, 0) >= LINUX_VERSION_CODE
+int cam_reserve_icp_fw(struct cam_fw_alloc_info *icp_fw, size_t fw_length)
+{
+	int rc = 0;
+	struct device_node *of_node;
+	struct device_node *mem_node;
+	struct resource     res;
+
+	of_node = (icp_fw->fw_dev)->of_node;
+	mem_node = of_parse_phandle(of_node, "memory-region", 0);
+	if (!mem_node) {
+		rc = -ENOMEM;
+		CAM_ERR(CAM_SMMU, "FW memory carveout not found");
+		goto end;
+	}
+	rc = of_address_to_resource(mem_node, 0, &res);
+	of_node_put(mem_node);
+	if (rc < 0) {
+		CAM_ERR(CAM_SMMU, "Unable to get start of FW mem carveout");
+		goto end;
+	}
+	icp_fw->fw_hdl = res.start;
+	icp_fw->fw_kva = ioremap_wc(icp_fw->fw_hdl, fw_length);
+	if (!icp_fw->fw_kva) {
+		CAM_ERR(CAM_SMMU, "Failed to map the FW.");
+		rc = -ENOMEM;
+		goto end;
+	}
+	memset_io(icp_fw->fw_kva, 0, fw_length);
+
+end:
+	return rc;
+}
+
+void cam_unreserve_icp_fw(struct cam_fw_alloc_info *icp_fw, size_t fw_length)
+{
+	iounmap(icp_fw->fw_kva);
+}
+#else
+int cam_reserve_icp_fw(struct cam_fw_alloc_info *icp_fw, size_t fw_length)
+{
+	int rc = 0;
+
+	icp_fw->fw_kva = dma_alloc_coherent(icp_fw->fw_dev, fw_length,
+		&icp_fw->fw_hdl, GFP_KERNEL);
+
+	if (!icp_fw->fw_kva) {
+		CAM_ERR(CAM_SMMU, "FW memory alloc failed");
+		rc = -ENOMEM;
+	}
+
+	return rc;
+}
+
+void cam_unreserve_icp_fw(struct cam_fw_alloc_info *icp_fw, size_t fw_length)
+{
+	dma_free_coherent(icp_fw->fw_dev, fw_length, icp_fw->fw_kva,
+		icp_fw->fw_hdl);
+}
+#endif