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drivers: pci: add map_bar support for Enhanced Allocation

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Makes dm_pci_map_bar API available for integrated PCI devices that
support Enhanced Allocation instead of the original PCI BAR mechanism.

Signed-off-by: Alex Marginean <alexm.osslist@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Alex Marginean
2019-06-07 11:24:23 +03:00
committed by Simon Glass
parent 2204bc1bd3
commit 0b143d8ab2
2 changed files with 59 additions and 0 deletions
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46
drivers/pci/pci-uclass.c
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@@ -1341,10 +1341,56 @@ pci_addr_t dm_pci_phys_to_bus(struct udevice *dev, phys_addr_t phys_addr,
return bus_addr;
}
static void *dm_pci_map_ea_bar(struct udevice *dev, int bar, int flags,
int ea_off)
{
int ea_cnt, i, entry_size;
int bar_id = (bar - PCI_BASE_ADDRESS_0) >> 2;
u32 ea_entry;
phys_addr_t addr;
/* EA capability structure header */
dm_pci_read_config32(dev, ea_off, &ea_entry);
ea_cnt = (ea_entry >> 16) & PCI_EA_NUM_ENT_MASK;
ea_off += PCI_EA_FIRST_ENT;
for (i = 0; i < ea_cnt; i++, ea_off += entry_size) {
/* Entry header */
dm_pci_read_config32(dev, ea_off, &ea_entry);
entry_size = ((ea_entry & PCI_EA_ES) + 1) << 2;
if (((ea_entry & PCI_EA_BEI) >> 4) != bar_id)
continue;
/* Base address, 1st DW */
dm_pci_read_config32(dev, ea_off + 4, &ea_entry);
addr = ea_entry & PCI_EA_FIELD_MASK;
if (ea_entry & PCI_EA_IS_64) {
/* Base address, 2nd DW, skip over 4B MaxOffset */
dm_pci_read_config32(dev, ea_off + 12, &ea_entry);
addr |= ((u64)ea_entry) << 32;
}
/* size ignored for now */
return map_physmem(addr, flags, 0);
}
return 0;
}
void *dm_pci_map_bar(struct udevice *dev, int bar, int flags)
{
pci_addr_t pci_bus_addr;
u32 bar_response;
int ea_off;
/*
* if the function supports Enhanced Allocation use that instead of
* BARs
*/
ea_off = dm_pci_find_capability(dev, PCI_CAP_ID_EA);
if (ea_off)
return dm_pci_map_ea_bar(dev, bar, flags, ea_off);
/* read BAR address */
dm_pci_read_config32(dev, bar, &bar_response);