leandrof/u-boot
1
0
Fork 1
Code Issues Pull Requests Packages Projects Releases Wiki Activity

dm: Introduce xxx_get_dma_range()

Browse Source 
Add the following functions to get a specific device's DMA ranges:
 - dev_get_dma_range()
 - ofnode_get_dma_range()
 - of_get_dma_range()
 - fdt_get_dma_range()
They are specially useful in oder to be able validate a physical address
space range into a bus's and to convert addresses from and to address
spaces.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Peter Robinson <pbrobinson@gmail.com>
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
This commit is contained in:
Nicolas Saenz Julienne
2021-01-12 13:55:22 +01:00
committed by Matthias Brugger
parent c709243ee0
commit 51bdb50904
8 changed files with 234 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

73
common/fdt_support.c
View File

@@ -1344,6 +1344,79 @@ u64 fdt_translate_dma_address(const void *blob, int node_offset,
return __of_translate_address(blob, node_offset, in_addr, "dma-ranges");
}
int fdt_get_dma_range(const void *blob, int node, phys_addr_t *cpu,
dma_addr_t *bus, u64 *size)
{
bool found_dma_ranges = false;
struct of_bus *bus_node;
const fdt32_t *ranges;
int na, ns, pna, pns;
int parent = node;
int ret = 0;
int len;
/* Find the closest dma-ranges property */
while (parent >= 0) {
ranges = fdt_getprop(blob, parent, "dma-ranges", &len);
/* Ignore empty ranges, they imply no translation required */
if (ranges && len > 0)
break;
/* Once we find 'dma-ranges', then a missing one is an error */
if (found_dma_ranges && !ranges) {
ret = -EINVAL;
goto out;
}
if (ranges)
found_dma_ranges = true;
parent = fdt_parent_offset(blob, parent);
}
if (!ranges || parent < 0) {
debug("no dma-ranges found for node %s\n",
fdt_get_name(blob, node, NULL));
ret = -ENOENT;
goto out;
}
/* switch to that node */
node = parent;
parent = fdt_parent_offset(blob, node);
if (parent < 0) {
printf("Found dma-ranges in root node, shoudln't happen\n");
ret = -EINVAL;
goto out;
}
/* Get the address sizes both for the bus and its parent */
bus_node = of_match_bus(blob, node);
bus_node->count_cells(blob, node, &na, &ns);
if (!OF_CHECK_COUNTS(na, ns)) {
printf("%s: Bad cell count for %s\n", __FUNCTION__,
fdt_get_name(blob, node, NULL));
return -EINVAL;
goto out;
}
bus_node = of_match_bus(blob, parent);
bus_node->count_cells(blob, parent, &pna, &pns);
if (!OF_CHECK_COUNTS(pna, pns)) {
printf("%s: Bad cell count for %s\n", __FUNCTION__,
fdt_get_name(blob, parent, NULL));
return -EINVAL;
goto out;
}
*bus = fdt_read_number(ranges, na);
*cpu = fdt_translate_dma_address(blob, node, ranges + na);
*size = fdt_read_number(ranges + na + pna, ns);
out:
return ret;
}
/**
* fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
* who's reg property matches a physical cpu address