The main goal of this patchset was to add Baikal-T1 AHCI SATA specifics support into the kernel AHCI subsystem. On the way of doing that we figured out that mainly these specifics are actually DWC AHCI SATA controller features, but still there were some Baikal-T1 SoC platform peculiarities which we had to take into account. So the patchset introduces two AHCI SATA controllers support and one AHCI SATA driver with a series of preparation, optimization and cleanup patches. The series starts used to start with converting the legacy AHCI SATA controllers text-based DT-bindings to the DT-schema. But turned out that has already been done in kernel v5.17. So instead we suggest to improve the bindings usability by splitting up the AHCI DT bindings into two schemas: one common AHCI SATA controller yaml-file, which can be reused by any AHCI-compatible controller utilizing the kernel AHCI library functions, and DT-bindings for the generic AHCI SATA devices indicated by the "generic-ahci" compatible string and implemented in the ahci_platform.c driver. Note after doing that we had to fix the sata-common.yaml file SATA port IDs constraint. Then a series of generic preparations-cleanups goes. First of all it concerns the device-managed methods usage in the framework of the CSR space remapping and the clocks requesting and enabling. Note since the clocks handlers are requested and kept in the generic AHCI library it seemed a good idea to add an AHCI-platform generic method to find and get a particular clock handler from the pool of the requested ones. It was used later in the series in the DWC/Baikal-T1-specific code. Secondly we suggested to at least sanity check the number of SATA ports DT-sub-nodes before using it further. Thirdly the ports-implemented DT-property parsing was moved from the AHCI platform-driver to the AHCI-library so to be used by the non-generic AHCI drivers if required (DT-schema is accordingly fixed too). Finally due to having the shared-reset control support we had to add a new AHCI-resource getter flag - AHCI_PLATFORM_RST_TRIGGER, which indicated using a trigger-like reset control. For such platforms the controller reset will be performed by means of the reset_control_reset() and reset_control_rearm() methods. AHCI-library reset functions encapsulating the way the reset procedure is performed have been also added. After that goes a patches series with the platform-specific AHCI-capabilities initialization. The suggested functionality will be useful for the platforms with no BIOS, comprehensive bootloader/firmware installed. In that case the AHCI-related platform-specifics like drive staggered spin-up, mechanical presence switch attached or FIS-based switching capability usage, etc will be left uninitialized with no generic way to be indicated as available if required. We suggested to use the AHCI device tree node and its ports sub-nodes for that. AHCI-platform library will be responsible fo the corresponding DT-properties parsing and pre-initialization of the internal capability registers cache, which will be then flashed back to the corresponding CSR after HBA reset. Thus a supposed to be firmware-work will be done by means of the AHCI-library and the DT-data. A set of the preparations/cleanups required to be done before introducing the feature. First the DT-properties indicating the corresponding capability availability were described in the common AHCI DT-binding schema. Second we needed to add the enum items with the AHCI Port CMD fields, which hadn't been added so far. Thirdly we suggested to discard one of the port-map internal storage (force_port_map) in favor of re-using another one (save_port_map) in order to simplify the port-map initialization interface a bit by getting rid from a redundant variable. Finally after discarding the double AHCI-version read procedure and changing the __ahci_port_base() method prototype the platform firmware-specific caps initialization functionality was introduced. The main part of the series goes afterwards. A dedicated DWC AHCI SATA controller driver was introduced together with the corresponding DT-binding schema pre-patch. Note the driver built mode is activated synchronously with the generic AHCI-platform driver by default so automatically to be integrated into the kernel for the DWC AHCI-based platforms which relied on activating the generic AHCI SATA controller driver. Aside with the generic resources getting and AHCI-host initialization, the driver implements the DWC-specific setups. In particular it checks whether the platform capabilities activated by the firmware (see the functionality described above) are actually supported by the controller. It's done by means of the vendor-specific registers. Then it makes sure that the embedded 1ms timer interval, which is used for the DevSleep and CCC features, is correctly initialized based on the application clock rate. The last but not least the driver provides a way to tune the DMA-interface performance up by setting the Tx/Rx transactions maximum size up. The required values are specified by means of the "snps,tx-ts-max" and snps,rx-ts-max" DT-properties. Finally we suggest to extend the DWC AHCI SATA controller driver functionality with a way to add the DWC-AHCI-based platform-specific quirks. Indeed there are many DWC AHCI-based controllers and just a few of them are diverged too much to be handled by a dedicated AHCI-driver. The rest of them most likely can work well either with a generic version of the driver or require a simple normally platform-specific quirk to get up and running. Such platforms can define a platform-data in the DWC AHCI driver with a set of the controller-specific flags and initialization functions. Those functions will be called at the corresponding stages of the device probe/resume/remove procedures so to be performing the platform setups/cleanups. After the denoted above functionality is added we can finally introduce the Baikal-T1 AHCI SATA controller support into the DWC AHCI SATA driver. The controller is based on the DWC AHCI SATA IP-core v4.10a and can work well with the generic DWC AHCI driver. The only peculiarity of it is connected with the SATA Ports reference clock source. It can be supplied either from the internal SoC PLL or from the chip pads. Currently we have to prefer selecting the signal coming from the pads if the corresponding clock source is specified because the link doesn't get stably established when the internal clock signal is activated. In addition the platform has trigger-based reset signals so the corresponding flag must be passed to the generic AHCI-resource getter. Link: https://lore.kernel.org/linux-ide/20220324001628.13028-1-Sergey.Semin@xxxxxxxxxxxxxxxxxxxx/ Changelog v2: - Rebase from kernel v5.17 to v5.18-rc3. (@Rob) - Rebase onto the already available AHCI DT schema. As a result two more patches have been added. (@Rob) - Rename 'syscon' property to 'baikal,bt1-syscon'. (@Rob) - Replace min/max constraints of the snps,{tx,rx}-ts-max property with enum [ 1, 2, 4, ..., 1024 ]. (@Rob) - Use dlemoal/libata.git git tree for the LIBATA SATA AHCI SYNOPSYS DWC driver (@Damien). - Change the local objects prefix from 'dwc_ahci_' to 'ahci_dwc_', from 'bt1_ahci_' to 'ahci_bt1_'. (@Damien) - Use LLDD term in place of 'glue-driver'. (@Damien) - Convert the ahci_platform_assert_rsts() method to returning int status (@Damien). - Drop the else word from the DT child_nodes value checking if-else-if statement (@Damien) and convert the after-else part into the ternary operator-based statement. - Convert to checking the error-case first in the devm_clk_bulk_get_all() method invocation. (@Damien) - Drop the rc variable initialization in the ahci_platform_get_resources() method. (@Damien) - Add comma and replace "channel" with "SATA port" in the reg property description of the sata-common.yaml schema. (@Damien) Signed-off-by: Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx> Cc: Alexey Malahov <Alexey.Malahov@xxxxxxxxxxxxxxxxxxxx> Cc: Pavel Parkhomenko <Pavel.Parkhomenko@xxxxxxxxxxxxxxxxxxxx> Cc: Rob Herring <robh+dt@xxxxxxxxxx> Cc: linux-ide@xxxxxxxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx Cc: devicetree@xxxxxxxxxxxxxxx Serge Semin (23): dt-bindings: ata: ahci-platform: Drop dma-coherent property declaration dt-bindings: ata: ahci-platform: Detach common AHCI bindings dt-bindings: ata: ahci-platform: Clarify common AHCI props constraints dt-bindings: ata: sata: Extend number of SATA ports ata: libahci_platform: Explicitly set rc on devres_alloc failure ata: libahci_platform: Convert to using platform devm-ioremap methods ata: libahci_platform: Convert to using devm bulk clocks API ata: libahci_platform: Add function returning a clock-handle by id ata: libahci_platform: Sanity check the DT child nodes number ata: libahci_platform: Parse ports-implemented property in resources getter ata: libahci_platform: Introduce reset assertion/deassertion methods dt-bindings: ata: ahci: Add platform capability properties ata: libahci: Extend port-cmd flags set with port capabilities ata: libahci: Discard redundant force_port_map parameter ata: libahci: Don't read AHCI version twice in the save-config method ata: ahci: Convert __ahci_port_base to accepting hpriv as arguments ata: ahci: Introduce firmware-specific caps initialization dt-bindings: ata: ahci: Add DWC AHCI SATA controller DT schema ata: ahci: Add DWC AHCI SATA controller support dt-bindings: ata: ahci: Add Baikal-T1 AHCI SATA controller DT schema ata: ahci-dwc: Add platform-specific quirks support ata: ahci-dwc: Add Baikal-T1 AHCI SATA interface support MAINTAINERS: Add maintainers for DWC AHCI SATA driver .../devicetree/bindings/ata/ahci-common.yaml | 188 +++++++ .../bindings/ata/ahci-platform.yaml | 89 +-- .../bindings/ata/baikal,bt1-ahci.yaml | 127 +++++ .../devicetree/bindings/ata/sata-common.yaml | 7 +- .../bindings/ata/snps,dwc-ahci.yaml | 123 ++++ MAINTAINERS | 9 + drivers/ata/Kconfig | 11 + drivers/ata/Makefile | 1 + drivers/ata/ahci.c | 4 +- drivers/ata/ahci.h | 21 +- drivers/ata/ahci_dwc.c | 526 ++++++++++++++++++ drivers/ata/ahci_mtk.c | 2 - drivers/ata/ahci_platform.c | 5 - drivers/ata/ahci_st.c | 3 - drivers/ata/libahci.c | 63 ++- drivers/ata/libahci_platform.c | 236 ++++++-- include/linux/ahci_platform.h | 8 +- 17 files changed, 1258 insertions(+), 165 deletions(-) create mode 100644 Documentation/devicetree/bindings/ata/ahci-common.yaml create mode 100644 Documentation/devicetree/bindings/ata/baikal,bt1-ahci.yaml create mode 100644 Documentation/devicetree/bindings/ata/snps,dwc-ahci.yaml create mode 100644 drivers/ata/ahci_dwc.c -- 2.35.1
