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of/address: Rework of_pci_range parsing for non-PCI buses 

The only PCI specific part of of_pci_range_parser_one() is the handling
of the 3rd address cell. Rework it to work on regular 1 and 2 cell
addresses.

Use defines and a union to avoid a treewide renaming of the parsing
helpers and struct.

Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Rob Herring 2020-02-06 14:01:05 +00:00
parent c67f3df88f
commit bc5e522ec4
2 changed files with 30 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
drivers/of/address.c
View File

@ -694,12 +694,12 @@ EXPORT_SYMBOL(of_get_address);
static int parser_init(struct of_pci_range_parser *parser,
struct device_node *node, const char *name)
{
const int na = 3, ns = 2;
int rlen;
parser->node = node;
parser->pna = of_n_addr_cells(node);
parser->np = parser->pna + na + ns;
parser->na = of_bus_n_addr_cells(node);
parser->ns = of_bus_n_size_cells(node);
parser->dma = !strcmp(name, "dma-ranges");
parser->range = of_get_property(node, name, &rlen);
@ -724,20 +724,28 @@ int of_pci_dma_range_parser_init(struct of_pci_range_parser *parser,
return parser_init(parser, node, "dma-ranges");
}
EXPORT_SYMBOL_GPL(of_pci_dma_range_parser_init);
#define of_dma_range_parser_init of_pci_dma_range_parser_init
struct of_pci_range *of_pci_range_parser_one(struct of_pci_range_parser *parser,
struct of_pci_range *range)
{
const int na = 3, ns = 2;
int na = parser->na;
int ns = parser->ns;
int np = parser->pna + na + ns;
if (!range)
return NULL;
if (!parser->range || parser->range + parser->np > parser->end)
if (!parser->range || parser->range + np > parser->end)
return NULL;
range->flags = of_bus_pci_get_flags(parser->range);
range->pci_addr = of_read_number(parser->range + 1, ns);
if (parser->na == 3)
range->flags = of_bus_pci_get_flags(parser->range);
else
range->flags = 0;
range->pci_addr = of_read_number(parser->range, na);
if (parser->dma)
range->cpu_addr = of_translate_dma_address(parser->node,
parser->range + na);
@ -746,15 +754,16 @@ struct of_pci_range *of_pci_range_parser_one(struct of_pci_range_parser *parser,
parser->range + na);
range->size = of_read_number(parser->range + parser->pna + na, ns);
parser->range += parser->np;
parser->range += np;
/* Now consume following elements while they are contiguous */
while (parser->range + parser->np <= parser->end) {
u32 flags;
while (parser->range + np <= parser->end) {
u32 flags = 0;
u64 pci_addr, cpu_addr, size;
flags = of_bus_pci_get_flags(parser->range);
pci_addr = of_read_number(parser->range + 1, ns);
if (parser->na == 3)
flags = of_bus_pci_get_flags(parser->range);
pci_addr = of_read_number(parser->range, na);
if (parser->dma)
cpu_addr = of_translate_dma_address(parser->node,
parser->range + na);
@ -770,7 +779,7 @@ struct of_pci_range *of_pci_range_parser_one(struct of_pci_range_parser *parser,
break;
range->size += size;
parser->range += parser->np;
parser->range += np;
}
return range;

12
include/linux/of_address.h
View File

@ -10,20 +10,27 @@ struct of_pci_range_parser {
struct device_node *node;
const __be32 *range;
const __be32 *end;
int np;
int na;
int ns;
int pna;
bool dma;
};
#define of_range_parser of_pci_range_parser
struct of_pci_range {
u64 pci_addr;
union {
u64 pci_addr;
u64 bus_addr;
};
u64 cpu_addr;
u64 size;
u32 flags;
};
#define of_range of_pci_range
#define for_each_of_pci_range(parser, range) \
for (; of_pci_range_parser_one(parser, range);)
#define for_each_of_range for_each_of_pci_range
/* Translate a DMA address from device space to CPU space */
extern u64 of_translate_dma_address(struct device_node *dev,
@ -142,4 +149,3 @@ static inline int of_pci_range_to_resource(struct of_pci_range *range,
#endif /* CONFIG_OF_ADDRESS && CONFIG_PCI */
#endif /* __OF_ADDRESS_H */