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RFC: arm: pci: Add PCI cam support to PCI-E ecam driver

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When booting U-Boot in crosvm, the virtual machine emulates a PCI cam
device, not the PCI-E 'ecam' device normally seen on e.g. QEMU. This
PCI device can be supported with only trivial changes to the ecam
driver.

Instead of adding a completely new driver which is identical besides the
initialization step, add support for the PCI version to the existing
driver.

Signed-off-by: Alistair Delva <adelva@google.com>
Cc: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
Cc: Ram Muthiah <rammuthiah@google.com>
This commit is contained in:
Alistair Delva 2021-10-20 21:31:34 +00:00 committed by Tom Rini
parent e3cdc2cbb1
commit 4f2e228086
1 changed files with 12 additions and 3 deletions
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15
drivers/pci/pcie_ecam_generic.c
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@ -14,6 +14,8 @@
#include <asm/io.h>
#define TYPE_PCI 0x1
/**
* struct generic_ecam_pcie - generic_ecam PCIe controller state
* @cfg_base: The base address of memory mapped configuration space
@ -46,8 +48,14 @@ static int pci_generic_ecam_conf_address(const struct udevice *bus,
void *addr;
addr = pcie->cfg_base;
addr += PCIE_ECAM_OFFSET(PCI_BUS(bdf) - pcie->first_busno,
PCI_DEV(bdf), PCI_FUNC(bdf), offset);
if (dev_get_driver_data(bus) == TYPE_PCI) {
addr += ((PCI_BUS(bdf) - pcie->first_busno) << 16) |
(PCI_DEV(bdf) << 11) | (PCI_FUNC(bdf) << 8) | offset;
} else {
addr += PCIE_ECAM_OFFSET(PCI_BUS(bdf) - pcie->first_busno,
PCI_DEV(bdf), PCI_FUNC(bdf), offset);
}
*paddress = addr;
return 0;
@ -156,7 +164,8 @@ static const struct dm_pci_ops pci_generic_ecam_ops = {
};
static const struct udevice_id pci_generic_ecam_ids[] = {
{ .compatible = "pci-host-ecam-generic" },
{ .compatible = "pci-host-ecam-generic" /* PCI-E */ },
{ .compatible = "pci-host-cam-generic", .data = TYPE_PCI },
{ }
};