From b584ab12d59f646b9254b2b16ff197d612fd4935 Mon Sep 17 00:00:00 2001 From: Jerome Brunet Date: Fri, 28 Mar 2025 15:30:44 +0100 Subject: PCI: rcar-gen4: set ep BAR4 fixed size On rcar-gen4, the ep BAR4 has a fixed size of 256B. Document this constraint in the epc features of the platform. Fixes: e311b3834dfa ("PCI: rcar-gen4: Add endpoint mode support") Signed-off-by: Jerome Brunet Signed-off-by: Manivannan Sadhasivam Reviewed-by: Manivannan Sadhasivam Link: https://patch.msgid.link/20250328-rcar-gen4-bar4-v1-1-10bb6ce9ee7f@baylibre.com --- drivers/pci/controller/dwc/pcie-rcar-gen4.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c index fc872dd35029..02638ec442e7 100644 --- a/drivers/pci/controller/dwc/pcie-rcar-gen4.c +++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c @@ -403,6 +403,7 @@ static const struct pci_epc_features rcar_gen4_pcie_epc_features = { .msix_capable = false, .bar[BAR_1] = { .type = BAR_RESERVED, }, .bar[BAR_3] = { .type = BAR_RESERVED, }, + .bar[BAR_4] = { .type = BAR_FIXED, .fixed_size = 256 }, .bar[BAR_5] = { .type = BAR_RESERVED, }, .align = SZ_1M, }; -- cgit v1.2.3 From 003d15b30f3690b14315822439edc2c3f823c6cd Mon Sep 17 00:00:00 2001 From: Yoshihiro Shimoda Date: Wed, 7 May 2025 19:09:47 +0900 Subject: PCI: rcar-gen4: Document how to obtain platform firmware MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Renesas R-Car V4H (r8a779g0) has PCIe controller, and it requires specific firmware downloading. So, add a document about the firmware how to get. Signed-off-by: Yoshihiro Shimoda [kwilczynski: commit log, refactor the document content and then add this new file to a correct index under the top-level PCI documentation] Signed-off-by: Krzysztof Wilczyński Reviewed-by: Manivannan Sadhasivam Link: https://lore.kernel.org/r/20250507100947.608875-1-yoshihiro.shimoda.uh@renesas.com --- Documentation/PCI/controller/index.rst | 10 +++++++ .../PCI/controller/rcar-pcie-firmware.rst | 32 ++++++++++++++++++++++ Documentation/PCI/index.rst | 1 + MAINTAINERS | 1 + 4 files changed, 44 insertions(+) create mode 100644 Documentation/PCI/controller/index.rst create mode 100644 Documentation/PCI/controller/rcar-pcie-firmware.rst diff --git a/Documentation/PCI/controller/index.rst b/Documentation/PCI/controller/index.rst new file mode 100644 index 000000000000..c2ce9ccdcfa0 --- /dev/null +++ b/Documentation/PCI/controller/index.rst @@ -0,0 +1,10 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=========================================== +PCI Native Host Bridge and Endpoint Drivers +=========================================== + +.. toctree:: + :maxdepth: 2 + + rcar-pcie-firmware diff --git a/Documentation/PCI/controller/rcar-pcie-firmware.rst b/Documentation/PCI/controller/rcar-pcie-firmware.rst new file mode 100644 index 000000000000..67d3bf66e315 --- /dev/null +++ b/Documentation/PCI/controller/rcar-pcie-firmware.rst @@ -0,0 +1,32 @@ +.. SPDX-License-Identifier: GPL-2.0 + +================================================= +Firmware of PCIe controller for Renesas R-Car V4H +================================================= + +Renesas R-Car V4H (r8a779g0) has a PCIe controller, requiring a specific +firmware download during startup. + +However, Renesas currently cannot distribute the firmware free of charge. + +The firmware file "104_PCIe_fw_addr_data_ver1.05.txt" (note that the file name +might be different between different datasheet revisions) can be found in the +datasheet encoded as text, and as such, the file's content must be converted +back to binary form. This can be achieved using the following example script: + +.. code-block:: sh + + $ awk '/^\s*0x[0-9A-Fa-f]{4}\s+0x[0-9A-Fa-f]{4}/ { print substr($2,5,2) substr($2,3,2) }' \ + 104_PCIe_fw_addr_data_ver1.05.txt | \ + xxd -p -r > rcar_gen4_pcie.bin + +Once the text content has been converted into a binary firmware file, verify +its checksum as follows: + +.. code-block:: sh + + $ sha1sum rcar_gen4_pcie.bin + 1d0bd4b189b4eb009f5d564b1f93a79112994945 rcar_gen4_pcie.bin + +The resulting binary file called "rcar_gen4_pcie.bin" should be placed in the +"/lib/firmware" directory before the driver runs. diff --git a/Documentation/PCI/index.rst b/Documentation/PCI/index.rst index 5e7c4e6e726b..5d720d2a415e 100644 --- a/Documentation/PCI/index.rst +++ b/Documentation/PCI/index.rst @@ -17,5 +17,6 @@ PCI Bus Subsystem pci-error-recovery pcieaer-howto endpoint/index + controller/index boot-interrupts tph diff --git a/MAINTAINERS b/MAINTAINERS index 96b827049501..ceceb4ecdb3f 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -18531,6 +18531,7 @@ M: Yoshihiro Shimoda L: linux-pci@vger.kernel.org L: linux-renesas-soc@vger.kernel.org S: Maintained +F: Documentation/PCI/controller/rcar-pcie-firmware.rst F: Documentation/devicetree/bindings/pci/*rcar* F: drivers/pci/controller/*rcar* F: drivers/pci/controller/dwc/*rcar* -- cgit v1.2.3