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authorAli Saidi <Ali.Saidi@ARM.com>2014-09-03 07:43:04 -0400
committerAli Saidi <Ali.Saidi@ARM.com>2014-09-03 07:43:04 -0400
commit1e13f1b074db8bf82601c45c400350be947cdefa (patch)
tree13984832a8e33302609985bc9bec4e99fdbf467e /src/dev
parent31e4e475d93fa2cc9ee152e90347129413642c54 (diff)
downloadgem5-1e13f1b074db8bf82601c45c400350be947cdefa.tar.xz
dev, arm: Add support for linux generic pci host driver
This change adds support for a generic pci host bus driver that has been included in recent Linux kernel instead of the more bespoke one we've been using to date. It also works with aarch64 so it provides PCI support for 64-bit ARM Linux. To make this work a new configuration option pci_io_base is added to the RealView platform that should be set to the start of the memory used as memory mapped IO ports (IO ports that are memory mapped, not regular memory mapped IO). And a parameter pci_cfg_gen_offsets which specifies if the config space offsets should be used that the generic driver expects. To use the pci-host-generic device you need to: pci_io_base = 0x2f000000 (Valid for VExpress EMM) pci_cfg_gen_offsets = True and add the following to your device tree: pci { compatible = "pci-host-ecam-generic"; device_type = "pci"; #address-cells = <0x3>; #size-cells = <0x2>; #interrupt-cells = <0x1>; //bus-range = <0x0 0x1>; // CPU_PHYSICAL(2) SIZE(2) // Note, some DTS blobs only support 1 size reg = <0x0 0x30000000 0x0 0x10000000>; // IO (1), no bus address (2), cpu address (2), size (2) // MMIO (1), at address (2), cpu address (2), size (2) ranges = <0x01000000 0x0 0x00000000 0x0 0x2f000000 0x0 0x10000>, <0x02000000 0x0 0x40000000 0x0 0x40000000 0x0 0x10000000>; // With gem5 we typically use INTA/B/C/D one per device interrupt-map = <0x0000 0x0 0x0 0x1 0x1 0x0 0x11 0x1 0x0000 0x0 0x0 0x2 0x1 0x0 0x12 0x1 0x0000 0x0 0x0 0x3 0x1 0x0 0x13 0x1 0x0000 0x0 0x0 0x4 0x1 0x0 0x14 0x1>; // Only match INTA/B/C/D and not BDF interrupt-map-mask = <0x0000 0x0 0x0 0x7>; };
Diffstat (limited to 'src/dev')
-rw-r--r--src/dev/arm/RealView.py5
-rw-r--r--src/dev/arm/realview.cc27
-rw-r--r--src/dev/arm/realview.hh3
3 files changed, 32 insertions, 3 deletions
diff --git a/src/dev/arm/RealView.py b/src/dev/arm/RealView.py
index 13ab50b70..ee5993a88 100644
--- a/src/dev/arm/RealView.py
+++ b/src/dev/arm/RealView.py
@@ -180,7 +180,10 @@ class RealView(Platform):
type = 'RealView'
cxx_header = "dev/arm/realview.hh"
system = Param.System(Parent.any, "system")
+ pci_io_base = Param.Addr(0, "Base address of PCI IO Space")
pci_cfg_base = Param.Addr(0, "Base address of PCI Configuraiton Space")
+ pci_cfg_gen_offsets = Param.Bool(False, "Should the offsets used for PCI cfg access"
+ " be compatible with the pci-generic-host or the legacy host bridge?")
mem_start_addr = Param.Addr(0, "Start address of main memory")
max_mem_size = Param.Addr('256MB', "Maximum amount of RAM supported by platform")
@@ -597,6 +600,8 @@ class VExpress_EMM(RealView):
self.mmc_fake.clk_domain = clkdomain
class VExpress_EMM64(VExpress_EMM):
+ pci_io_base = 0x2f000000
+ pci_cfg_gen_offsets = True
def setupBootLoader(self, mem_bus, cur_sys, loc):
self.nvmem = SimpleMemory(range = AddrRange(0, size = '64MB'))
self.nvmem.port = mem_bus.master
diff --git a/src/dev/arm/realview.cc b/src/dev/arm/realview.cc
index 18208b402..0409f888d 100644
--- a/src/dev/arm/realview.cc
+++ b/src/dev/arm/realview.cc
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2009 ARM Limited
+ * Copyright (c) 2009, 2014 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
@@ -63,6 +63,21 @@ RealView::RealView(const Params *p)
{}
void
+RealView::initState()
+{
+ Addr junk;
+ bool has_gen_pci_host;
+ has_gen_pci_host = system->kernelSymtab->findAddress("gen_pci_setup", junk);
+
+ if (has_gen_pci_host && !params()->pci_cfg_gen_offsets)
+ warn("Kernel supports generic PCI host but PCI Config offsets "
+ "configured for legacy. Set pci_cfg_gen_offsets to True");
+ if (has_gen_pci_host && !params()->pci_io_base)
+ warn("Kernel supports generic PCI host but PCI IO base is set "
+ "to 0. Set pci_io_base to the start of PCI IO space");
+}
+
+void
RealView::postConsoleInt()
{
warn_once("Don't know what interrupt to post for console.\n");
@@ -100,13 +115,19 @@ RealView::calcPciConfigAddr(int bus, int dev, int func)
{
if (bus != 0)
return ULL(-1);
- return params()->pci_cfg_base | ((func & 7) << 16) | ((dev & 0x1f) << 19);
+
+ Addr cfg_offset = 0;
+ if (params()->pci_cfg_gen_offsets)
+ cfg_offset |= ((func & 7) << 12) | ((dev & 0x1f) << 15);
+ else
+ cfg_offset |= ((func & 7) << 16) | ((dev & 0x1f) << 19);
+ return params()->pci_cfg_base | cfg_offset;
}
Addr
RealView::calcPciIOAddr(Addr addr)
{
- return addr;
+ return params()->pci_io_base + addr;
}
Addr
diff --git a/src/dev/arm/realview.hh b/src/dev/arm/realview.hh
index 38fa040d5..5129069d4 100644
--- a/src/dev/arm/realview.hh
+++ b/src/dev/arm/realview.hh
@@ -79,6 +79,9 @@ class RealView : public Platform
*/
RealView(const Params *p);
+ /** In init do some checks to help verify we're setup correctly */
+ virtual void initState();
+
/** Give platform a pointer to interrupt controller */
void setGic(BaseGic *_gic) { gic = _gic; }