arch/arm/mach-ixp4xx/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 if ARCH_IXP4XX
   3
   4 menu "Intel IXP4xx Implementation Options"
   5
   6 comment "IXP4xx Platforms"
   7
   8 config MACH_IXP4XX_OF
   9         bool
  10         prompt "Device Tree IXP4xx boards"
  11         default y
  12         select ARM_APPENDED_DTB # Old Redboot bootloaders deployed
  13         select I2C
  14         select I2C_IOP3XX
  15         select PCI
  16         select USE_OF
  17         help
  18           Say 'Y' here to support Device Tree-based IXP4xx platforms.
  19
  20 config MACH_GATEWAY7001
  21         bool "Gateway 7001"
  22         depends on IXP4XX_PCI_LEGACY
  23         help
  24           Say 'Y' here if you want your kernel to support Gateway's
  25           7001 Access Point. For more information on this platform,
  26           see http://openwrt.org
  27
  28 config MACH_GORAMO_MLR
  29         bool "GORAMO Multi Link Router"
  30         depends on IXP4XX_PCI_LEGACY
  31         help
  32           Say 'Y' here if you want your kernel to support GORAMO
  33           MultiLink router.
  34
  35 config ARCH_PRPMC1100
  36         bool "PrPMC1100"
  37         help
  38           Say 'Y' here if you want your kernel to support the Motorola
  39           PrPCM1100 Processor Mezanine Module. For more information on
  40           this platform, see <file:Documentation/arm/ixp4xx.rst>.
  41
  42 #
  43 # Certain registers and IRQs are only enabled if supporting IXP465 CPUs
  44 #
  45 config CPU_IXP46X
  46         bool
  47         depends on MACH_IXDP465
  48         default y
  49
  50 config CPU_IXP43X
  51         bool
  52         depends on MACH_KIXRP435
  53         default y
  54
  55 comment "IXP4xx Options"
  56
  57 config IXP4XX_PCI_LEGACY
  58         bool "IXP4xx legacy PCI driver support"
  59         depends on PCI
  60         help
  61           Selects legacy PCI driver.
  62           Not recommended for new development.
  63
  64 config IXP4XX_INDIRECT_PCI
  65         bool "Use indirect PCI memory access"
  66         depends on IXP4XX_PCI_LEGACY
  67         help
  68           IXP4xx provides two methods of accessing PCI memory space:
  69
  70           1) A direct mapped window from 0x48000000 to 0x4BFFFFFF (64MB).
  71              To access PCI via this space, we simply ioremap() the BAR
  72              into the kernel and we can use the standard read[bwl]/write[bwl]
  73              macros. This is the preferred method due to speed but it
  74              limits the system to just 64MB of PCI memory. This can be
  75              problematic if using video cards and other memory-heavy devices.
  76
  77           2) If > 64MB of memory space is required, the IXP4xx can be
  78              configured to use indirect registers to access the whole PCI
  79              memory space. This currently allows for up to 1 GB (0x10000000
  80              to 0x4FFFFFFF) of memory on the bus. The disadvantage of this
  81              is that every PCI access requires three local register accesses
  82              plus a spinlock, but in some cases the performance hit is
  83              acceptable. In addition, you cannot mmap() PCI devices in this
  84              case due to the indirect nature of the PCI window.
  85
  86           By default, the direct method is used. Choose this option if you
  87           need to use the indirect method instead. If you don't know
  88           what you need, leave this option unselected.
  89
  90 endmenu
  91
  92 endif