diff options
| -rw-r--r-- | include/sbi_utils/fdt/fdt_driver.h | 59 | ||||
| -rw-r--r-- | lib/utils/fdt/fdt_driver.c | 80 | ||||
| -rw-r--r-- | lib/utils/fdt/objects.mk | 1 |
3 files changed, 140 insertions, 0 deletions
diff --git a/include/sbi_utils/fdt/fdt_driver.h b/include/sbi_utils/fdt/fdt_driver.h new file mode 100644 index 0000000..f6fd26f --- /dev/null +++ b/include/sbi_utils/fdt/fdt_driver.h @@ -0,0 +1,59 @@ +/* + * SPDX-License-Identifier: BSD-2-Clause + * + * fdt_driver.h - Generic support for initializing drivers from DT nodes. + * + * Copyright (c) 2024 SiFive + */ + +#ifndef __FDT_DRIVER_H__ +#define __FDT_DRIVER_H__ + +#include <sbi_utils/fdt/fdt_helper.h> + +struct fdt_driver { + const struct fdt_match *match_table; + int (*init)(const void *fdt, int nodeoff, + const struct fdt_match *match); +}; + +/** + * Initialize a driver instance for a specific DT node + * + * @param fdt devicetree blob + * @param nodeoff offset of a node in the devicetree blob + * @param drivers NULL-terminated array of drivers to match against this node + * + * @return 0 if a driver was matched and successfully initialized or a negative + * error code on failure + */ +int fdt_driver_init_by_offset(const void *fdt, int nodeoff, + const struct fdt_driver *const *drivers); + +/** + * Initialize a driver instance for each DT node that matches any of the + * provided drivers + * + * @param fdt devicetree blob + * @param drivers NULL-terminated array of drivers to match against each node + * + * @return 0 if drivers for all matches (if any) were successfully initialized + * or a negative error code on failure + */ +int fdt_driver_init_all(const void *fdt, + const struct fdt_driver *const *drivers); + +/** + * Initialize a driver instance for the first DT node that matches any of the + * provided drivers + * + * @param fdt devicetree blob + * @param drivers NULL-terminated array of drivers to match against each node + * + * @return 0 if a driver was matched and successfully initialized or a negative + * error code on failure + */ +int fdt_driver_init_one(const void *fdt, + const struct fdt_driver *const *drivers); + +#endif /* __FDT_DRIVER_H__ */ diff --git a/lib/utils/fdt/fdt_driver.c b/lib/utils/fdt/fdt_driver.c new file mode 100644 index 0000000..586ea8a --- /dev/null +++ b/lib/utils/fdt/fdt_driver.c @@ -0,0 +1,80 @@ +/* + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2024 SiFive + */ + +#include <libfdt.h> +#include <sbi/sbi_console.h> +#include <sbi/sbi_error.h> +#include <sbi_utils/fdt/fdt_driver.h> +#include <sbi_utils/fdt/fdt_helper.h> + +int fdt_driver_init_by_offset(const void *fdt, int nodeoff, + const struct fdt_driver *const *drivers) +{ + const struct fdt_driver *driver; + const struct fdt_match *match; + const void *prop; + int len, rc; + + if (!fdt_node_is_enabled(fdt, nodeoff)) + return SBI_ENODEV; + + prop = fdt_getprop(fdt, nodeoff, "compatible", &len); + if (!prop) + return SBI_ENODEV; + + while ((driver = *drivers++)) { + for (match = driver->match_table; match->compatible; match++) { + if (!fdt_stringlist_contains(prop, len, match->compatible)) + continue; + + rc = driver->init(fdt, nodeoff, match); + if (rc < 0) { + const char *name; + + name = fdt_get_name(fdt, nodeoff, NULL); + sbi_printf("%s: %s (%s) init failed: %d\n", + __func__, name, match->compatible, rc); + } + + return rc; + } + } + + return SBI_ENODEV; +} + +static int fdt_driver_init_scan(const void *fdt, + const struct fdt_driver *const *drivers, + bool one) +{ + int nodeoff, rc; + + for (nodeoff = fdt_next_node(fdt, -1, NULL); + nodeoff >= 0; + nodeoff = fdt_next_node(fdt, nodeoff, NULL)) { + rc = fdt_driver_init_by_offset(fdt, nodeoff, drivers); + if (rc == SBI_ENODEV) + continue; + if (rc < 0) + return rc; + if (one) + return 0; + } + + return one ? SBI_ENODEV : 0; +} + +int fdt_driver_init_all(const void *fdt, + const struct fdt_driver *const *drivers) +{ + return fdt_driver_init_scan(fdt, drivers, false); +} + +int fdt_driver_init_one(const void *fdt, + const struct fdt_driver *const *drivers) +{ + return fdt_driver_init_scan(fdt, drivers, true); +} diff --git a/lib/utils/fdt/objects.mk b/lib/utils/fdt/objects.mk index 5cede81..1a2298b 100644 --- a/lib/utils/fdt/objects.mk +++ b/lib/utils/fdt/objects.mk @@ -7,4 +7,5 @@ libsbiutils-objs-$(CONFIG_FDT_DOMAIN) += fdt/fdt_domain.o libsbiutils-objs-$(CONFIG_FDT_PMU) += fdt/fdt_pmu.o libsbiutils-objs-$(CONFIG_FDT) += fdt/fdt_helper.o +libsbiutils-objs-$(CONFIG_FDT) += fdt/fdt_driver.o libsbiutils-objs-$(CONFIG_FDT) += fdt/fdt_fixup.o |