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drivers: pci: add api to get dma regions

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Add api to get dma regions.

Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
This commit is contained in:
Rayagonda Kokatanur 2020-05-12 13:29:49 +05:30 committed by Tom Rini
parent fe5c777df2
commit 143eb5b1ca
2 changed files with 44 additions and 1 deletions
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42
drivers/pci/pci-uclass.c
View File

@ -1179,6 +1179,48 @@ ulong pci_conv_size_to_32(ulong old, ulong value, uint offset,
return value;
}
int pci_get_dma_regions(struct udevice *dev, struct pci_region *memp, int index)
{
int pci_addr_cells, addr_cells, size_cells;
int cells_per_record;
const u32 *prop;
int len;
int i = 0;
prop = ofnode_get_property(dev_ofnode(dev), "dma-ranges", &len);
if (!prop) {
log_err("PCI: Device '%s': Cannot decode dma-ranges\n",
dev->name);
return -EINVAL;
}
pci_addr_cells = ofnode_read_simple_addr_cells(dev_ofnode(dev));
addr_cells = ofnode_read_simple_addr_cells(dev_ofnode(dev->parent));
size_cells = ofnode_read_simple_size_cells(dev_ofnode(dev));
/* PCI addresses are always 3-cells */
len /= sizeof(u32);
cells_per_record = pci_addr_cells + addr_cells + size_cells;
debug("%s: len=%d, cells_per_record=%d\n", __func__, len,
cells_per_record);
while (len) {
memp->bus_start = fdtdec_get_number(prop + 1, 2);
prop += pci_addr_cells;
memp->phys_start = fdtdec_get_number(prop, addr_cells);
prop += addr_cells;
memp->size = fdtdec_get_number(prop, size_cells);
prop += size_cells;
if (i == index)
return 0;
i++;
len -= cells_per_record;
}
return -EINVAL;
}
int pci_get_regions(struct udevice *dev, struct pci_region **iop,
struct pci_region **memp, struct pci_region **prefp)
{

3
include/pci.h
View File

@ -1315,7 +1315,8 @@ struct udevice *pci_get_controller(struct udevice *dev);
*/
int pci_get_regions(struct udevice *dev, struct pci_region **iop,
struct pci_region **memp, struct pci_region **prefp);
int
pci_get_dma_regions(struct udevice *dev, struct pci_region *memp, int index);
/**
* dm_pci_write_bar32() - Write the address of a BAR
*