2  * Copyright (c) 2016-2020, ARM Limited and Contributors. All rights reserved.
4  * SPDX-License-Identifier: BSD-3-Clause
13  * is used by the secure world, so that non-secure software avoids using
39  * the same execution state (AArch32/AArch64) as TF-A.
40  * Kernels running in AArch32 on an AArch64 TF-A should use PSCI v0.2.
51  * dt_add_psci_node() - Add a PSCI node into an existing device tree
62  * Return: 0 on success, -1 otherwise.
75 		return -1;  in dt_add_psci_node()
78 		return -1;  in dt_add_psci_node()
79 	if (append_psci_compatible(fdt, offs, "arm,psci-1.0"))  in dt_add_psci_node()
80 		return -1;  in dt_add_psci_node()
81 	if (append_psci_compatible(fdt, offs, "arm,psci-0.2"))  in dt_add_psci_node()
82 		return -1;  in dt_add_psci_node()
84 		return -1;  in dt_add_psci_node()
86 		return -1;  in dt_add_psci_node()
88 		return -1;  in dt_add_psci_node()
90 		return -1;  in dt_add_psci_node()
92 		return -1;  in dt_add_psci_node()
98  * "cpu" and which's enable-method is not "psci" (yet).
126 		prop = fdt_getprop(fdt, offs, "enable-method", &len);  in dt_update_one_cpu_node()
131 		ret = fdt_setprop_string(fdt, offs, "enable-method", "psci");  in dt_update_one_cpu_node()
141 	if (offs == -FDT_ERR_NOTFOUND)  in dt_update_one_cpu_node()
148  * dt_add_psci_cpu_enable_methods() - switch CPU nodes in DT to use PSCI
152  * the enable-method to PSCI. This will add the enable-method properties, if
176  * fdt_add_reserved_memory() - reserve (secure) memory regions in DT
177  * @dtb:	pointer to the device tree blob in memory
182  * Add a region of memory to the /reserved-memory node in a device tree in
186  * can be used to announce secure memory regions, as it adds the "no-map"
189  * See reserved-memory/reserved-memory.txt in the (Linux kernel) DT binding
191  * According to this binding, the address-cells and size-cells must match
196 int fdt_add_reserved_memory(void *dtb, const char *node_name,  in fdt_add_reserved_memory()  argument
199 	int offs = fdt_path_offset(dtb, "/reserved-memory");  in fdt_add_reserved_memory()
204 	ac = fdt_address_cells(dtb, 0);  in fdt_add_reserved_memory()
205 	sc = fdt_size_cells(dtb, 0);  in fdt_add_reserved_memory()
207 		offs = fdt_add_subnode(dtb, 0, "reserved-memory");  in fdt_add_reserved_memory()
211 		fdt_setprop_u32(dtb, offs, "#address-cells", ac);  in fdt_add_reserved_memory()
212 		fdt_setprop_u32(dtb, offs, "#size-cells", sc);  in fdt_add_reserved_memory()
213 		fdt_setprop(dtb, offs, "ranges", NULL, 0);  in fdt_add_reserved_memory()
228 	offs = fdt_add_subnode(dtb, offs, node_name);  in fdt_add_reserved_memory()
229 	fdt_setprop(dtb, offs, "no-map", NULL, 0);  in fdt_add_reserved_memory()
230 	fdt_setprop(dtb, offs, "reg", addresses, idx * sizeof(uint32_t));  in fdt_add_reserved_memory()
237  * @dtb:		Pointer to the device tree blob in memory
241  * Create and add a new cpu node to a DTB.
246 static int fdt_add_cpu(void *dtb, int parent, u_register_t mpidr)  in fdt_add_cpu()  argument
258 	cpu_offs = fdt_add_subnode(dtb, parent, snode_name);  in fdt_add_cpu()
265 	err = fdt_setprop_string(dtb, cpu_offs, "compatible", "arm,armv8");  in fdt_add_cpu()
272 	err = fdt_setprop_u64(dtb, cpu_offs, "reg", reg_prop);  in fdt_add_cpu()
279 	err = fdt_setprop_string(dtb, cpu_offs, "device_type", "cpu");  in fdt_add_cpu()
286 	err = fdt_setprop_string(dtb, cpu_offs, "enable-method", "psci");  in fdt_add_cpu()
289 			"enable-method", cpu_offs);  in fdt_add_cpu()
297  * fdt_add_cpus_node() - Add the cpus node to the DTB
298  * @dtb:		pointer to the device tree blob in memory
304  * add a cpus node to the DTB with all the valid CPUs on the system.
310  *		#address-cells = <2>;
311  *		#size-cells = <0>;
317  *			enable-method = "psci";
323  *			enable-method = "psci";
333 int fdt_add_cpus_node(void *dtb, unsigned int afflv0,  in fdt_add_cpus_node()  argument
342 	if (fdt_path_offset(dtb, "/cpus") >= 0) {  in fdt_add_cpus_node()
343 		return -EEXIST;  in fdt_add_cpus_node()
346 	offs = fdt_add_subnode(dtb, 0, "cpus");  in fdt_add_cpus_node()
352 	err = fdt_setprop_u32(dtb, offs, "#address-cells", 2);  in fdt_add_cpus_node()
355 			"#address-cells", offs);  in fdt_add_cpus_node()
359 	err = fdt_setprop_u32(dtb, offs, "#size-cells", 0);  in fdt_add_cpus_node()
362 			"#size-cells", offs);  in fdt_add_cpus_node()
371 	for (i = afflv2; i > 0U; i--) {  in fdt_add_cpus_node()
372 		for (j = afflv1; j > 0U; j--) {  in fdt_add_cpus_node()
373 			for (k = afflv0; k > 0U; k--) {  in fdt_add_cpus_node()
374 				mpidr = ((i - 1) << MPIDR_AFF2_SHIFT) |  in fdt_add_cpus_node()
375 					((j - 1) << MPIDR_AFF1_SHIFT) |  in fdt_add_cpus_node()
376 					((k - 1) << MPIDR_AFF0_SHIFT) |  in fdt_add_cpus_node()
382 					err = fdt_add_cpu(dtb, offs, mpidr);  in fdt_add_cpus_node()
398  * fdt_adjust_gic_redist() - Adjust GICv3 redistributor size
399  * @dtb: Pointer to the DT blob in memory
406  * this size cannot be known upfront and thus can't be hardcoded into the DTB.
419 int fdt_adjust_gic_redist(void *dtb, unsigned int nr_cores,  in fdt_adjust_gic_redist()  argument
422 	int offset = fdt_node_offset_by_compatible(dtb, 0, "arm,gic-v3");  in fdt_adjust_gic_redist()
433 	parent = fdt_parent_offset(dtb, offset);  in fdt_adjust_gic_redist()
437 	ac = fdt_address_cells(dtb, parent);  in fdt_adjust_gic_redist()
438 	sc = fdt_size_cells(dtb, parent);  in fdt_adjust_gic_redist()
440 		return -EINVAL;  in fdt_adjust_gic_redist()
456 		ret = fdt_setprop_inplace_namelen_partial(dtb, offset,  in fdt_adjust_gic_redist()
478 	return fdt_setprop_inplace_namelen_partial(dtb, offset, "reg", 3,  in fdt_adjust_gic_redist()