[PATCH 7/8] remoteproc: qcom: Add support for memory sandbox

[Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>]

Add memory sandbox support for ADSP based platforms secure booting.

Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
---
 drivers/remoteproc/qcom_q6v5_adsp.c | 101 +++++++++++++++++++++++++++++++++++-
 1 file changed, 99 insertions(+), 2 deletions(-)

diff --git a/drivers/remoteproc/qcom_q6v5_adsp.c b/drivers/remoteproc/qcom_q6v5_adsp.c
index 3dbd035..f81da47 100644
--- a/drivers/remoteproc/qcom_q6v5_adsp.c
+++ b/drivers/remoteproc/qcom_q6v5_adsp.c
@@ -9,6 +9,7 @@
 #include <linux/firmware.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
+#include <linux/iommu.h>
 #include <linux/iopoll.h>
 #include <linux/kernel.h>
 #include <linux/mfd/syscon.h>
@@ -48,6 +49,8 @@
 #define LPASS_PWR_ON_REG		0x10
 #define LPASS_HALTREQ_REG		0x0
 
+#define SID_MASK_DEFAULT        0xF
+
 #define QDSP6SS_XO_CBCR		0x38
 #define QDSP6SS_CORE_CBCR	0x20
 #define QDSP6SS_SLEEP_CBCR	0x3c
@@ -77,7 +80,7 @@ struct adsp_pil_data {
 struct qcom_adsp {
 	struct device *dev;
 	struct rproc *rproc;
-
+	struct iommu_domain *iommu_dom;
 	struct qcom_q6v5 q6v5;
 
 	struct clk *xo;
@@ -332,6 +335,91 @@ static int adsp_load(struct rproc *rproc, const struct firmware *fw)
 	return 0;
 }
 
+static int adsp_map_smmu(struct qcom_adsp *adsp, struct rproc *rproc)
+{
+	struct of_phandle_args args;
+	int ret, rc, i;
+	long long sid;
+
+	unsigned long mem_phys;
+	unsigned long iova;
+	const __be32 *prop;
+	int access_level;
+	uint32_t len, flag, mem_size;
+	int offset;
+	struct fw_rsc_hdr *hdr;
+	struct fw_rsc_devmem *rsc_fw;
+
+	rc = of_parse_phandle_with_fixed_args(adsp->dev->of_node, "iommus", 1, 0, &args);
+	if (rc < 0)
+		sid = -1;
+	else
+		sid = args.args[0] & SID_MASK_DEFAULT;
+
+	adsp->iommu_dom = iommu_domain_alloc(&platform_bus_type);
+	if (!adsp->iommu_dom) {
+		dev_err(adsp->dev, "failed to allocate iommu domain\n");
+		return -ENOMEM;
+	}
+
+	ret = iommu_attach_device(adsp->iommu_dom, adsp->dev);
+	if (ret) {
+		dev_err(adsp->dev, "could not attach device ret = %d\n", ret);
+		return -EBUSY;
+	}
+
+	/* Add SID configuration for ADSP Firmware to SMMU */
+	adsp->mem_phys =  adsp->mem_phys | (sid << 32);
+
+	ret = iommu_map(adsp->iommu_dom, adsp->mem_phys, adsp->mem_phys,
+			adsp->mem_size,	IOMMU_READ | IOMMU_WRITE);
+	if (ret) {
+		dev_err(adsp->dev, "Unable to map ADSP Physical Memory\n");
+		return ret;
+	}
+
+	prop = of_get_property(adsp->dev->of_node, "qcom,adsp-memory", &len);
+	if (prop) {
+		len /= sizeof(__be32);
+		for (i = 0; i < len; i++) {
+			iova = be32_to_cpu(prop[i++]);
+			mem_phys = be32_to_cpu(prop[i++]);
+			mem_size = be32_to_cpu(prop[i++]);
+			access_level = be32_to_cpu(prop[i]);
+
+			if (access_level)
+				flag = IOMMU_READ | IOMMU_WRITE;
+			else
+				flag = IOMMU_READ;
+
+			ret = iommu_map(adsp->iommu_dom, iova, mem_phys, mem_size, flag);
+			if (ret) {
+				dev_err(adsp->dev, "failed to map addr = %p mem_size = %x\n",
+						&(mem_phys), mem_size);
+				return ret;
+			}
+		}
+	} else {
+		if (!rproc->table_ptr)
+			return 0;
+
+		for (i = 0; i < rproc->table_ptr->num; i++) {
+			offset = rproc->table_ptr->offset[i];
+			hdr = (void *)rproc->table_ptr + offset;
+			rsc_fw = (struct fw_rsc_devmem *)hdr + sizeof(*hdr);
+
+			ret = iommu_map(rproc->domain, rsc_fw->da, rsc_fw->pa,
+						rsc_fw->len, rsc_fw->flags);
+			if (ret) {
+				pr_err("%s; unable to map adsp memory address\n", __func__);
+				return ret;
+			}
+		}
+	}
+	return 0;
+}
+
+
 static int adsp_start(struct rproc *rproc)
 {
 	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
@@ -341,7 +429,13 @@ static int adsp_start(struct rproc *rproc)
 	ret = qcom_q6v5_prepare(&adsp->q6v5);
 	if (ret)
 		return ret;
-
+	if (!adsp->is_wpss) {
+		ret = adsp_map_smmu(adsp, rproc);
+		if (ret) {
+			dev_err(adsp->dev, "ADSP smmu mapping failed\n");
+			goto adsp_smmu_unmap;
+		}
+	}
 	ret = clk_prepare_enable(adsp->xo);
 	if (ret)
 		goto disable_irqs;
@@ -402,6 +496,9 @@ static int adsp_start(struct rproc *rproc)
 	clk_disable_unprepare(adsp->xo);
 disable_irqs:
 	qcom_q6v5_unprepare(&adsp->q6v5);
+adsp_smmu_unmap:
+	iommu_unmap(adsp->iommu_dom, adsp->mem_phys, adsp->mem_size);
+	iommu_domain_free(adsp->iommu_dom);
 
 	return ret;
 }
-- 
2.7.4