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virtio: pci: Make use of dm_pci_map_bar()

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The virtio PCI capabilities describe regions of memory that should be
mapped. Map those with dm_pci_map_bar() which will ensure they are valid
PCI regions.

Signed-off-by: Andrew Scull <ascull@google.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Andrew Scull 2022-04-21 16:11:15 +00:00 committed by Tom Rini
parent c763e1e023
commit 0699a78c0c
1 changed files with 8 additions and 10 deletions
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18
drivers/virtio/virtio_pci_modern.c
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@ -459,19 +459,17 @@ static int virtio_pci_find_capability(struct udevice *udev, u8 cfg_type,
static void __iomem *virtio_pci_map_capability(struct udevice *udev,
const struct virtio_pci_cap *cap)
{
ulong base;
void __iomem *p;
/*
* TODO: adding 64-bit BAR support
*
* Per spec, the BAR is permitted to be either 32-bit or 64-bit.
* For simplicity, only read the BAR address as 32-bit.
* Find the corresponding memory region that isn't system memory but is
* writable.
*/
base = dm_pci_read_bar32(udev, cap->bar);
p = (void __iomem *)base + cap->offset;
unsigned long mask =
PCI_REGION_TYPE | PCI_REGION_SYS_MEMORY | PCI_REGION_RO;
unsigned long flags = PCI_REGION_MEM;
u8 *p = dm_pci_map_bar(udev, PCI_BASE_ADDRESS_0 + cap->bar, cap->offset,
cap->length, mask, flags);
return p;
return (void __iomem *)p;
}
static int virtio_pci_bind(struct udevice *udev)