linux-kernel - [PATCH] firmware: qcom: scm: add 32 bit iommu page table support

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Date:   Tue, 31 Dec 2019 22:37:04 -0500
From:   Brian Masney <masneyb@...tation.org>
To:     bjorn.andersson@...aro.org
Cc:     agross@...nel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] firmware: qcom: scm: add 32 bit iommu page table support

Add 32 bit implmentations of the functions
__qcom_scm_iommu_secure_ptbl_size() and
__qcom_scm_iommu_secure_ptbl_init() that are required by the qcom_iommu
driver.

Signed-off-by: Brian Masney <masneyb@...tation.org>
---
 drivers/firmware/qcom_scm-32.c | 32 ++++++++++++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/qcom_scm-32.c b/drivers/firmware/qcom_scm-32.c
index 48e2ef794ea3..f149a85d36b0 100644
--- a/drivers/firmware/qcom_scm-32.c
+++ b/drivers/firmware/qcom_scm-32.c
@@ -638,13 +638,41 @@ int __qcom_scm_restore_sec_cfg(struct device *dev, u32 device_id,
 int __qcom_scm_iommu_secure_ptbl_size(struct device *dev, u32 spare,
 				      size_t *size)
 {
-	return -ENODEV;
+	int psize[2] = { 0, 0 };
+	int ret;
+
+	ret = qcom_scm_call(dev, QCOM_SCM_SVC_MP,
+			    QCOM_SCM_IOMMU_SECURE_PTBL_SIZE,
+			    &spare, sizeof(spare), &psize, sizeof(psize));
+	if (ret || psize[1])
+		return ret ? ret : -EINVAL;
+
+	*size = psize[0];
+
+	return 0;
 }
 
 int __qcom_scm_iommu_secure_ptbl_init(struct device *dev, u64 addr, u32 size,
 				      u32 spare)
 {
-	return -ENODEV;
+	struct msm_scm_ptbl_init {
+		__le32 paddr;
+		__le32 size;
+		__le32 spare;
+	} req;
+	int ret, scm_ret = 0;
+
+	req.paddr = addr;
+	req.size = size;
+	req.spare = spare;
+
+	ret = qcom_scm_call(dev, QCOM_SCM_SVC_MP,
+			    QCOM_SCM_IOMMU_SECURE_PTBL_INIT,
+			    &req, sizeof(req), &scm_ret, sizeof(scm_ret));
+	if (ret || scm_ret)
+		return ret ? ret : -EINVAL;
+
+	return 0;
 }
 
 int __qcom_scm_io_readl(struct device *dev, phys_addr_t addr,
-- 
2.21.0