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authorLinus Walleij <linus.walleij@linaro.org>2021-05-03 00:09:20 +0200
committerLinus Walleij <linus.walleij@linaro.org>2021-06-17 11:42:48 +0200
commitf7821b49345848246692c6e0aa170c8bc6723f86 (patch)
tree5e1cef4ba6cd5cb4b5b0f05c9d0f314c9ffc81c0 /MAINTAINERS
parentPCI: ixp4xx: Add device tree bindings for IXP4xx (diff)
downloadlinux-f7821b49345848246692c6e0aa170c8bc6723f86.tar.xz
linux-f7821b49345848246692c6e0aa170c8bc6723f86.zip
PCI: ixp4xx: Add a new driver for IXP4xx
This adds a new PCI controller driver for the Intel IXP4xx (IX425, IXP435 etc), based on the XScale microarchitecture. This replaces the old driver in arch/arm/mach-ixp4xx/common-pci.c which utilized the ARM-specific BIOS32 PCI framework, and all parameterization for such things as memory and IO space as well as interrupt swizzling is done from the device tree. The plan is to phase out and delete the old driver piecemal. The __raw_writel() and __raw_readl() are used for accessing the PCI controller for the same reason that these accessors are used in the timer, IRQ and GPIO drivers: the platform will alter its address bus pattern based on whether the system is booted in big- or little-endian mode. For this reason all register on IXP4xx must always be accessed in native (CPU) endianness. This driver supports 64MB of PCI memory space, but not the indirect access of 1GB that is available in the old driver. We can address that later if and only if there are users that need all 1GB of PCI address space. Krzysztof reports having to use indirect MMIO only once for a VGA card. There is work ongoing for general indirect MMIO. (In practice the indirect MMIO is performed by writing address and writing and reading values into/from a controller register.) Tested by booting the NSLU2, attaching a USB stick, mounting and browsing the drive. Link: https://lore.kernel.org/linux-arm-kernel/m37edwuv8m.fsf@t19.piap.pl/ Cc: Arnd Bergmann <arnd@arndb.de> Cc: Imre Kaloz <kaloz@openwrt.org> Cc: Krzysztof Halasa <khalasa@piap.pl> Cc: Zoltan HERPAI <wigyori@uid0.hu> Cc: Raylynn Knight <rayknight@me.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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diff --git a/MAINTAINERS b/MAINTAINERS
index bd7aff0c120f..16f17ac198e7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14016,6 +14016,12 @@ S: Maintained
F: Documentation/devicetree/bindings/pci/sifive,fu740-pcie.yaml
F: drivers/pci/controller/dwc/pcie-fu740.c
+PCI DRIVER FOR INTEL IXP4XX
+M: Linus Walleij <linus.walleij@linaro.org>
+S: Maintained
+F: Documentation/devicetree/bindings/pci/intel,ixp4xx-pci.yaml
+F: drivers/pci/controller/pci-ixp4xx.c
+
PCI DRIVER FOR INTEL VOLUME MANAGEMENT DEVICE (VMD)
M: Jonathan Derrick <jonathan.derrick@intel.com>
L: linux-pci@vger.kernel.org