diff options
Diffstat (limited to 'arch/arm/mach-imx/imx8/fdt.c')
| -rw-r--r-- | arch/arm/mach-imx/imx8/fdt.c | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/imx8/fdt.c b/arch/arm/mach-imx/imx8/fdt.c new file mode 100644 index 00000000000..65c8ac1a7e2 --- /dev/null +++ b/arch/arm/mach-imx/imx8/fdt.c @@ -0,0 +1,292 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright 2019 NXP + */ + +#include <common.h> +#include <asm/arch/sci/sci.h> +#include <asm/arch/sys_proto.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)); + } + } + } + } +} + +static int config_smmu_resource_sid(int rsrc, int sid) +{ + int err; + + if (!check_owned_resource(rsrc)) { + printf("%s rsrc[%d] not owned\n", __func__, rsrc); + return -1; + } + err = sc_rm_set_master_sid(-1, rsrc, sid); + debug("set_master_sid rsrc=%d sid=0x%x err=%d\n", rsrc, sid, err); + if (err != SC_ERR_NONE) { + pr_err("fail set_master_sid rsrc=%d sid=0x%x err=%d\n", rsrc, sid, err); + return -EINVAL; + } + + return 0; +} + +static int config_smmu_fdt_device_sid(void *blob, int device_offset, int sid) +{ + const char *name = fdt_get_name(blob, device_offset, NULL); + struct fdtdec_phandle_args args; + int rsrc, ret; + int proplen; + const fdt32_t *prop; + int i; + + prop = fdt_getprop(blob, device_offset, "fsl,sc_rsrc_id", &proplen); + if (prop) { + int i; + + debug("configure node %s sid 0x%x for %d resources\n", + name, sid, (int)(proplen / sizeof(fdt32_t))); + for (i = 0; i < proplen / sizeof(fdt32_t); ++i) { + ret = config_smmu_resource_sid(fdt32_to_cpu(prop[i]), + sid); + if (ret) + return ret; + } + + return 0; + } + + i = 0; + while (true) { + ret = fdtdec_parse_phandle_with_args(blob, device_offset, + "power-domains", + "#power-domain-cells", + 0, i++, &args); + if (ret == -ENOENT) { + break; + } else if (ret) { + printf("Parse power-domains of node %s wrong: %d\n", + fdt_get_name(blob, device_offset, NULL), ret); + continue; + } + + debug("configure node %s sid 0x%x rsrc=%d\n", + name, sid, rsrc); + rsrc = args.args[0]; + + ret = config_smmu_resource_sid(rsrc, sid); + if (ret) + break; + } + + return ret; +} + +static int config_smmu_fdt(void *blob) +{ + int offset, proplen, i, ret; + const fdt32_t *prop; + const char *name; + + /* Legacy smmu bindings, still used by xen. */ + offset = fdt_node_offset_by_compatible(blob, 0, "arm,mmu-500"); + prop = fdt_getprop(blob, offset, "mmu-masters", &proplen); + if (offset > 0 && prop) { + debug("found legacy mmu-masters property\n"); + + for (i = 0; i < proplen / 8; ++i) { + u32 phandle = fdt32_to_cpu(prop[2 * i]); + int sid = fdt32_to_cpu(prop[2 * i + 1]); + int device_offset; + + device_offset = fdt_node_offset_by_phandle(blob, + phandle); + if (device_offset < 0) { + pr_err("Not find device from mmu_masters: %d", + device_offset); + continue; + } + ret = config_smmu_fdt_device_sid(blob, device_offset, + sid); + if (ret) + return ret; + } + + /* Ignore new bindings if old bindings found, just like linux. */ + return 0; + } + + /* Generic smmu bindings */ + offset = 0; + while ((offset = fdt_next_node(blob, offset, NULL)) > 0) { + name = fdt_get_name(blob, offset, NULL); + prop = fdt_getprop(blob, offset, "iommus", &proplen); + if (!prop) + continue; + debug("node %s iommus proplen %d\n", name, proplen); + + if (proplen == 12) { + int sid = fdt32_to_cpu(prop[1]); + + config_smmu_fdt_device_sid(blob, offset, sid); + } else if (proplen != 4) { + debug("node %s ignore unexpected iommus proplen=%d\n", + name, proplen); + } + } + + return 0; +} + +static int ft_add_optee_node(void *fdt, bd_t *bd) +{ + const char *path, *subpath; + int offs; + + /* + * No TEE space allocated indicating no TEE running, so no + * need to add optee node in dts + */ + if (!boot_pointer[1]) + return 0; + + offs = fdt_increase_size(fdt, 512); + if (offs) { + printf("No Space for dtb\n"); + return 1; + } + + path = "/firmware"; + offs = fdt_path_offset(fdt, path); + if (offs < 0) { + path = "/"; + offs = fdt_path_offset(fdt, path); + + if (offs < 0) { + printf("Could not find root node.\n"); + return offs; + } + + subpath = "firmware"; + offs = fdt_add_subnode(fdt, offs, subpath); + if (offs < 0) { + printf("Could not create %s node.\n", subpath); + return offs; + } + } + + subpath = "optee"; + offs = fdt_add_subnode(fdt, offs, subpath); + if (offs < 0) { + printf("Could not create %s node.\n", subpath); + return offs; + } + + fdt_setprop_string(fdt, offs, "compatible", "linaro,optee-tz"); + fdt_setprop_string(fdt, offs, "method", "smc"); + + return 0; +} + +int ft_system_setup(void *blob, bd_t *bd) +{ + int ret; + + update_fdt_with_owned_resources(blob); + + if (is_imx8qm()) { + ret = config_smmu_fdt(blob); + if (ret) + return ret; + } + + return ft_add_optee_node(blob, bd); +} |