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  1. 23 11月, 2022 6 次提交
    • S
      PCI: dwc: Add Baikal-T1 PCIe controller support · ba6ed462
      由 Serge Semin 提交于 
      Baikal-T1 SoC is equipped with DWC PCIe v4.60a host controller. It can be
trained to work up to Gen.3 speed over up to x4 lanes. The host controller
is attached to the DW PCIe 3.0 PCS via the PIPE-4 interface, which in its
turn is connected to the DWC 10G PHY. The whole system is supposed to be
fed up with four clock sources: DBI peripheral clock, AXI application
clocks and external PHY/core reference clock generating the 100MHz signal.
In addition to that the platform provide a way to reset each part of the
controller: sticky/non-sticky bits, host controller core, PIPE interface,
PCS/PHY and Hot/Power reset signal. The driver also provides a way to
handle the GPIO-based PERST# signal.

Note due to the Baikal-T1 MMIO peculiarity we have to implement the DBI
interface accessors which make sure the IO operations are dword-aligned.

Link: https://lore.kernel.org/r/20221113191301.5526-21-Sergey.Semin@baikalelectronics.ruSigned-off-by: NSerge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: NLorenzo Pieralisi <lpieralisi@kernel.org>
      ba6ed462
    • S
      PCI: dwc: Introduce generic platform clocks and resets · ef69f852
      由 Serge Semin 提交于 
      Currently almost each platform driver uses its own resets and clocks
naming in order to get the corresponding descriptors. It makes the code
harder to maintain and comprehend especially seeing the DWC PCIe core main
resets and clocks signals set hasn't changed much for about at least one
major IP-core release. So in order to organize things around these signals
we suggest to create a generic interface for them in accordance with the
naming introduced in the DWC PCIe IP-core reference manual:

Application clocks:
- "dbi"  - data bus interface clock (on some DWC PCIe platforms it's
           referred as "pclk", "pcie", "sys", "ahb", "cfg", "iface",
           "gio", "reg", "pcie_apb_sys");
- "mstr" - AXI-bus master interface clock (some DWC PCIe glue drivers
           refer to this clock as "port", "bus", "pcie_bus",
           "bus_master/master_bus/axi_m", "pcie_aclk");
- "slv"  - AXI-bus slave interface clock (also called as "port", "bus",
           "pcie_bus", "bus_slave/slave_bus/axi_s", "pcie_aclk",
           "pcie_inbound_axi").

Core clocks:
- "pipe" - core-PCS PIPE interface clock coming from external PHY (it's
           normally named by the platform drivers as just "pipe");
- "core" - primary clock of the controller (none of the platform drivers
           declare such a clock but in accordance with the ref. manual
           the devices may have it separately specified);
- "aux"  - auxiliary PMC domain clock (it is named by some platforms as
           "pcie_aux" and just "aux");
- "ref"  - Generic reference clock (it is a generic clock source, which
           can be used as a signal source for multiple interfaces, some
           platforms call it as "ref", "general", "pcie_phy",
           "pcie_phy_ref").

Application resets:
- "dbi"  - Data-bus interface reset (it's CSR interface clock and is
           normally called as "apb" though technically it's not APB but
           DWC PCIe-specific interface);
- "mstr" - AXI-bus master reset (some platforms call it as "port", "apps",
           "bus", "axi_m");
- "slv"  - ABI-bus slave reset (some platforms call it as "port", "apps",
           "bus", "axi_s").

Core resets:
- "non-sticky" - non-sticky CSR flags reset;
- "sticky"     - sticky CSR flags reset;
- "pipe"       - PIPE-interface (Core-PCS) logic reset (some platforms
                 call it just "pipe");
- "core"       - controller primary reset (resets everything except PMC
                 module, some platforms refer to this signal as "soft",
                 "pci");
- "phy"        - PCS/PHY block reset (strictly speaking it is normally
                 connected to the input of an external block, but the
                 reference manual says it must be available for the PMC
                 working correctly, some existing platforms call it
                 "pciephy", "phy", "link");
- "hot"        - PMC hot reset signal (also called as "sleep");
- "pwr"        - cold reset signal (can be referred as "pwr", "turnoff").

Bus reset:
- "perst" - PCIe standard signal used to reset the PCIe peripheral
            devices.

As you can see each platform uses it's own naming for basically the same
set of the signals. In the framework of this commit we suggest to add a
set of the clocks and reset signals resources, corresponding names and
identifiers for each denoted entity. At current stage the platforms will
be able to use the provided infrastructure to automatically request all
these resources and manipulate with them in the Host/EP init callbacks.
Alas it isn't that easy to create a common cold/hot reset procedure due to
too many platform-specifics in the procedure, like the external flags
exposure and the delays requirement.

Link: https://lore.kernel.org/r/20221113191301.5526-20-Sergey.Semin@baikalelectronics.ruSigned-off-by: NSerge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: NLorenzo Pieralisi <lpieralisi@kernel.org>
      ef69f852
    • S
      PCI: dwc: Combine iATU detection procedures · 9f67ecdd
      由 Serge Semin 提交于 
      Since the iATU CSR region is now retrieved in the DW PCIe resources getter
there is no much benefits in the iATU detection procedures splitting up.
Therefore let's join the iATU unroll/viewport detection procedure with the
rest of the iATU parameters detection code. The resultant method will be
as coherent as before, while the redundant functions will be eliminated
thus producing more readable code.

Link: https://lore.kernel.org/r/20221113191301.5526-19-Sergey.Semin@baikalelectronics.ruSigned-off-by: NSerge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: NLorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: NRob Herring <robh@kernel.org>
Reviewed-by: NManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
      9f67ecdd
    • S
      PCI: dwc: Introduce generic resources getter · ef8c5887
      由 Serge Semin 提交于 
      Currently the DW PCIe Root Port and Endpoint CSR spaces are retrieved in
the separate parts of the DW PCIe core driver. It doesn't really make
sense since the both controller types have identical set of the core CSR
regions: DBI, DBI CS2 and iATU/eDMA. Thus we can simplify the DW PCIe Host
and EP initialization methods by moving the platform-specific registers
space getting and mapping into a common method. It gets to be even more
justified seeing the CSRs base address pointers are preserved in the
common DW PCIe descriptor. Note all the OF-based common DW PCIe settings
initialization will be moved to the new method too in order to have a
single function for all the generic platform properties handling in single
place.

A nice side-effect of this change is that the pcie-designware-host.c and
pcie-designware-ep.c drivers are cleaned up from all the direct dw_pcie
storage modification, which makes the DW PCIe core, Root Port and Endpoint
modules more coherent.

Link: https://lore.kernel.org/r/20221113191301.5526-18-Sergey.Semin@baikalelectronics.ruSigned-off-by: NSerge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: NLorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: NRob Herring <robh@kernel.org>
      ef8c5887
    • S
      PCI: dwc: Introduce generic controller capabilities interface · 7f9e982d
      由 Serge Semin 提交于 
      Since in addition to the already available iATU unrolled mapping we are
about to add a few more DW PCIe platform-specific capabilities (CDM-check
and generic clocks/resets resources) let's add a generic interface to set
and get the flags indicating their availability. The new interface shall
improve maintainability of the platform-specific code.

Link: https://lore.kernel.org/r/20221113191301.5526-17-Sergey.Semin@baikalelectronics.ruSigned-off-by: NSerge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: NLorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: NRob Herring <robh@kernel.org>
Reviewed-by: NManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
      7f9e982d
    • S
      PCI: dwc: Introduce dma-ranges property support for RC-host · 8522e17d
      由 Serge Semin 提交于 
      In accordance with the generic PCIe Root Port DT-bindings the "dma-ranges"
property has the same format as the "ranges" property. The only difference
is in their semantics. The "dma-ranges" property describes the PCIe-to-CPU
memory mapping in opposite to the CPU-to-PCIe mapping of the "ranges"
property. Even though the DW PCIe controllers are normally equipped with
the internal Address Translation Unit which inbound and outbound tables
can be used to implement both properties semantics, it was surprising for
me to discover that the host-related part of the DW PCIe driver currently
supports the "ranges" property only while the "dma-ranges" windows are
just ignored. Having the "dma-ranges" supported in the driver would be
very handy for the platforms, that don't tolerate the 1:1 CPU-PCIe memory
mapping and require a customized PCIe memory layout. So let's fix that by
introducing the "dma-ranges" property support.

First of all we suggest to rename the dw_pcie_prog_inbound_atu() method to
dw_pcie_prog_ep_inbound_atu() and create a new version of the
dw_pcie_prog_inbound_atu() function. Thus we'll have two methods for the
RC and EP controllers respectively in the same way as it has been
developed for the outbound ATU setup methods.

Secondly aside with the memory window index and type the new
dw_pcie_prog_inbound_atu() function will accept CPU address, PCIe address
and size as its arguments. These parameters define the PCIe and CPU memory
ranges which will be used to setup the respective inbound ATU mapping. The
passed parameters need to be verified against the ATU ranges constraints
in the same way as it is done for the outbound ranges.

Finally the DMA-ranges detected for the PCIe controller need to be
converted to the inbound ATU entries during the host controller
initialization procedure. It will be done in the framework of the
dw_pcie_iatu_setup() method. Note before setting the inbound ranges up we
need to disable all the inbound ATU entries in order to prevent unexpected
PCIe TLPs translations defined by some third party software like
bootloaders.

Link: https://lore.kernel.org/r/20221113191301.5526-16-Sergey.Semin@baikalelectronics.ruSigned-off-by: NSerge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: NLorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: NRob Herring <robh@kernel.org>
Reviewed-by: NManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
      8522e17d
  3. 17 11月, 2022 1 次提交
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