Hi Sricharan,
Thank you for the patch.
On Wednesday 06 Apr 2016 19:59:31 Sricharan R wrote:
> The driver currently works based on platform data. Remove this
> and add support for DT. A single master can have multiple ports
> connected to more than one iommu.
>
> master
> |
> |
> |
> ------------------------
> | |
> IOMMU0 IOMMU1
> | |
> ctx0 ctx1 ctx0 ctx1
>
> This association of master and iommus/contexts were previously
> represented by platform data parent/child device details. The client
> drivers were responsible for programming all of the iommus/contexts
> for the device. Now while adapting to generic DT bindings we maintain the
> list of iommus, contexts that each master domain is connected to and
> program all of them on attach/detach.
>
> Signed-off-by: Sricharan R <sricharan@xxxxxxxxxxxxxx>
> ---
> .../devicetree/bindings/iommu/msm,iommu-v0.txt | 59 ++++
> drivers/iommu/msm_iommu.c | 252 +++++++++--------
> drivers/iommu/msm_iommu.h | 73 ++---
> drivers/iommu/msm_iommu_dev.c | 315 ++++--------------
> 4 files changed, 296 insertions(+), 403 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/iommu/msm,iommu-v0.txt
>
> diff --git a/Documentation/devicetree/bindings/iommu/msm,iommu-v0.txt
> b/Documentation/devicetree/bindings/iommu/msm,iommu-v0.txt new file mode
> 100644
> index 0000000..21bfbfc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iommu/msm,iommu-v0.txt
> @@ -0,0 +1,59 @@
> +* QCOM IOMMU
> +
> +The QCOM IOMMU is an implementation compatible with the ARM VMSA short
> +descriptor page tables. It provides address translation for bus masters
> outside
> +of the CPU, each connected to the IOMMU through a port called micro-TLB.
> +
> +Required Properties:
> +
> + - compatible: Must contain "qcom,iommu-v0".
> + - reg: Base address and size of the IOMMU registers.
> + - interrupts: Specifiers for the MMU fault interrupts. For instances that
> + support secure mode two interrupts must be specified, for non-secure
> and
> + secure mode, in that order. For instances that don't support secure
> mode a
> + single interrupt must be specified.
> + - #iommu-cells: This is the total number of stream ids that a master
> would
> + use during transactions which will be specified as a list
> + as a part of iommus property below.
That's not correct. #iommu-cells, as defined in the core IOMMU DT bindings, is
"the number of cells in an IOMMU specifier needed to encode an address"
(address being a stream id here).
Can the number of cells differ from instance to instance, or is it always 2 ?
> + - ncb: The total number of context banks in the IOMMU.
Should this be qcom,ncb ?
> + - clocks : List of clocks to be used during SMMU register access. See
> + Documentation/devicetree/bindings/clock/clock-bindings.txt
> + for information about the format. For each clock specified
> + here, there must be a corresponding entry in clock-names
> + (see below).
> +
> + - clock-names : List of clock names corresponding to the clocks specified
> in
> + the "clocks" property (above). See
> + Documentation/devicetree/bindings/clock/clock-bindings.txt
> + for more info.
> +
> +Each bus master connected to an IOMMU must reference the IOMMU in its
> device
> +node with the following property:
> +
> + - iommus: A reference to the IOMMU in multiple cells. The first cell is a
> + phandle to the IOMMU and the second cell is the list of the
> + stream ids used by the device.
You mention in your cover letter that a master device can be connected to
multiple iommus, shouldn't that be stated here ? On the same topic, do your
masters need to selectively enable/disable memory ports to IOMMUs, or can they
all be enabled/disabled together ?
Also, the second cell can't be a list of stream ids, as one cell stores one
value. A master device using multiple stream ids should use multiple entries
in the iommus property.
> +Example: mdp iommu and its bus master
> +
> + mdp_port0: qcom,iommu@7500000 {
I think you can use iommu instead of qcom,iommu.
> + compatible = "msm,iommu-v0";
> + #iommu-cells = <2>;
> + clock-names =
> + "smmu_pclk",
> + "iommu_clk";
> + clocks =
> + <&mmcc SMMU_AHB_CLK>,
> + <&mmcc MDP_AXI_CLK>;
> + reg = <0x07500000 0x100000>;
> + interrupts =
> + <GIC_SPI 63 0>,
> + <GIC_SPI 64 0>;
> + ncb = <2>;
> + };
> +
> + mdp: qcom,mdp@5100000 {
> + compatible = "qcom,mdp";
> + ...
> + iommus = <&mdp_port0 0 2>;
> + };
--
Regards,
Laurent Pinchart
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