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[fdt] Generalise access to "reg" property

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The "reg" property is also used by non-device nodes, such as the nodes
describing the system memory map.

Provide generalised functionality for parsing the "#address-cells",
"#size-cells", and "reg" properties.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-05-09 16:26:41 +01:00
parent 3027864f13
commit f988ec09e0
4 changed files with 141 additions and 26 deletions
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13
src/include/ipxe/devtree.h
View File

@@ -11,6 +11,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <ipxe/device.h>
#include <ipxe/dma.h>
#include <ipxe/fdt.h>
/** A devicetree device */
struct dt_device {
@@ -25,18 +26,10 @@ struct dt_device {
/** Driver-private data */
void *priv;
/** Number of address cells for child devices */
uint32_t address_cells;
/** Number of size cells for child devices */
uint32_t size_cells;
/** Register cell size specification */
struct fdt_reg_cells regs;
};
/** Default number of address cells, if not specified */
#define DT_DEFAULT_ADDRESS_CELLS 2
/** Default number of size cells, if not specified */
#define DT_DEFAULT_SIZE_CELLS 1
/** A devicetree driver */
struct dt_driver {
/** Driver name */

26
src/include/ipxe/fdt.h
View File

@@ -124,6 +124,22 @@ struct fdt_descriptor {
int depth;
};
/** A device tree region cell size specification */
struct fdt_reg_cells {
/** Number of address cells */
uint32_t address_cells;
/** Number of size cells */
uint32_t size_cells;
/** Number of address cells plus number of size cells */
unsigned int stride;
};
/** Default number of address cells, if not specified */
#define FDT_DEFAULT_ADDRESS_CELLS 2
/** Default number of size cells, if not specified */
#define FDT_DEFAULT_SIZE_CELLS 1
extern struct image_tag fdt_image __image_tag;
extern struct fdt sysfdt;
@@ -144,6 +160,16 @@ extern int fdt_u64 ( struct fdt *fdt, unsigned int offset, const char *name,
uint64_t *value );
extern int fdt_u32 ( struct fdt *fdt, unsigned int offset, const char *name,
uint32_t *value );
extern void fdt_reg_cells ( struct fdt *fdt, unsigned int offset,
struct fdt_reg_cells *regs );
extern int fdt_reg_count ( struct fdt *fdt, unsigned int offset,
struct fdt_reg_cells *regs );
extern int fdt_reg_address ( struct fdt *fdt, unsigned int offset,
struct fdt_reg_cells *regs, unsigned int index,
uint64_t *address );
extern int fdt_reg_size ( struct fdt *fdt, unsigned int offset,
struct fdt_reg_cells *regs, unsigned int index,
uint64_t *size );
extern int fdt_mac ( struct fdt *fdt, unsigned int offset,
struct net_device *netdev );
extern int fdt_parse ( struct fdt *fdt, struct fdt_header *hdr,