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pci_decode: fixup Intel LPSS (I2C) PCI BARs

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Discovered on Tigerlake (Fujitsu U7411) and Alderlake (Framework Gen12)
notebook devices.

Issue #5195
This commit is contained in:
Christian Helmuth 2022-10-21 15:00:33 +02:00
parent b085550a0c
commit 10f8da4a13
1 changed files with 30 additions and 0 deletions
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30
repos/os/src/app/pci_decode/main.cc
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@ -75,6 +75,32 @@ struct Main
};
/*
* If PCI devices happen to miss complete configuration after boot, i.e., have
* a zero base address, we report a fixed address for known devices.
* platform_drv in turn, will setup the address from the report when enabling
* the device.
*
* The issue was discovered with Intel LPSS devices in Fujitsu notebooks.
*
* XXX static fixup list should be replaced by dynamic mapping of BAR
*/
static uint64_t fixup_bar_base_address(Bdf bdf, unsigned bar, uint64_t addr, size_t size)
{
auto base_address = addr;
/* Intel LPSS (I2C) devices - values taken from Linux boot */
if (bdf == Bdf { 0, 0x15, 0 } && bar == 0) base_address = 0x4017000000;
if (bdf == Bdf { 0, 0x15, 1 } && bar == 0) base_address = 0x4017001000;
if (bdf == Bdf { 0, 0x15, 2 } && bar == 0) base_address = 0x4017001000;
if (bdf == Bdf { 0, 0x15, 3 } && bar == 0) base_address = 0x4017002000;
if (addr != base_address)
log(bdf, " remap MEM BAR", bar, " ", Hex_range(addr, size), " to ", Hex(base_address));
return base_address;
}
/*
* The bus and function parsers return either the current bus number or the
* subordinate bus number (highest bus number of all of the busses that can be
@ -153,6 +179,10 @@ bus_t Main::parse_pci_function(Bdf bdf,
cfg.for_each_bar([&] (uint64_t addr, uint64_t size,
unsigned bar, bool pf)
{
addr = fixup_bar_base_address(bdf, bar, addr, size);
if (!addr)
warning(bdf, " MEM BAR", bar, " ", Hex_range(addr, size),
" has invalid base address - consider pci-fixup in parse_pci_function()");
gen.node("io_mem", [&]
{
gen.attribute("pci_bar", bar);