diff options
| -rw-r--r-- | arch/arm/mach-imx/imx8/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/mach-imx/imx8/fdt.c | 108 |
2 files changed, 109 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/imx8/Makefile b/arch/arm/mach-imx/imx8/Makefile index 5f62b2826e..7fc34762a2 100644 --- a/arch/arm/mach-imx/imx8/Makefile +++ b/arch/arm/mach-imx/imx8/Makefile @@ -5,6 +5,7 @@ # obj-y += cpu.o iomux.o misc.o +obj-$(CONFIG_OF_SYSTEM_SETUP) += fdt.o ifdef CONFIG_SPL_BUILD obj-$(CONFIG_SPL_LOAD_IMX_CONTAINER) += parse-container.o diff --git a/arch/arm/mach-imx/imx8/fdt.c b/arch/arm/mach-imx/imx8/fdt.c new file mode 100644 index 0000000000..d20cb6973a --- /dev/null +++ b/arch/arm/mach-imx/imx8/fdt.c @@ -0,0 +1,108 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright 2019 NXP + */ + +#include <common.h> +#include <asm/arch/sci/sci.h> +#include <dm/ofnode.h> +#include <fdt_support.h> + +DECLARE_GLOBAL_DATA_PTR; + +static bool check_owned_resource(sc_rsrc_t rsrc_id) +{ + bool owned; + + owned = sc_rm_is_resource_owned(-1, rsrc_id); + + return owned; +} + +static int disable_fdt_node(void *blob, int nodeoffset) +{ + int rc, ret; + const char *status = "disabled"; + + do { + rc = fdt_setprop(blob, nodeoffset, "status", status, + strlen(status) + 1); + if (rc) { + if (rc == -FDT_ERR_NOSPACE) { + ret = fdt_increase_size(blob, 512); + if (ret) + return ret; + } + } + } while (rc == -FDT_ERR_NOSPACE); + + return rc; +} + +static void update_fdt_with_owned_resources(void *blob) +{ + /* + * Traverses the fdt nodes, check its power domain and use + * the resource id in the power domain for checking whether + * it is owned by current partition + */ + struct fdtdec_phandle_args args; + int offset = 0, depth = 0; + u32 rsrc_id; + int rc, i; + + for (offset = fdt_next_node(blob, offset, &depth); offset > 0; + offset = fdt_next_node(blob, offset, &depth)) { + debug("Node name: %s, depth %d\n", + fdt_get_name(blob, offset, NULL), depth); + + if (!fdt_get_property(blob, offset, "power-domains", NULL)) { + debug(" - ignoring node %s\n", + fdt_get_name(blob, offset, NULL)); + continue; + } + + if (!fdtdec_get_is_enabled(blob, offset)) { + debug(" - ignoring node %s\n", + fdt_get_name(blob, offset, NULL)); + continue; + } + + i = 0; + while (true) { + rc = fdtdec_parse_phandle_with_args(blob, offset, + "power-domains", + "#power-domain-cells", + 0, i++, &args); + if (rc == -ENOENT) { + break; + } else if (rc) { + printf("Parse power-domains of %s wrong: %d\n", + fdt_get_name(blob, offset, NULL), rc); + continue; + } + + rsrc_id = args.args[0]; + + if (!check_owned_resource(rsrc_id)) { + rc = disable_fdt_node(blob, offset); + if (!rc) { + printf("Disable %s rsrc %u not owned\n", + fdt_get_name(blob, offset, NULL), + rsrc_id); + } else { + printf("Unable to disable %s, err=%s\n", + fdt_get_name(blob, offset, NULL), + fdt_strerror(rc)); + } + } + } + } +} + +int ft_system_setup(void *blob, bd_t *bd) +{ + update_fdt_with_owned_resources(blob); + + return 0; +} |