2 * Copyright (c) 2016-2018, NVIDIA CORPORATION.
4 * SPDX-License-Identifier: GPL-2.0+
9 #include <fdt_support.h>
11 #include <asm/arch/tegra.h>
12 #include <asm/armv8/mmu.h>
14 extern unsigned long nvtboot_boot_x0;
17 * The following few functions run late during the boot process and dynamically
18 * calculate the load address of various binaries. To keep track of multiple
19 * allocations, some writable list of RAM banks must be used. tegra_mem_map[]
20 * is used for this purpose to avoid making yet another copy of the list of RAM
21 * banks. This is safe because tegra_mem_map[] is only used once during very
22 * early boot to create U-Boot's page tables, long before this code runs. If
23 * this assumption becomes invalid later, we can just fix the code to copy the
24 * list of RAM banks into some private data structure before running.
27 extern struct mm_region tegra_mem_map[];
29 static char *gen_varname(const char *var, const char *ext)
31 size_t len_var = strlen(var);
32 size_t len_ext = strlen(ext);
33 size_t len = len_var + len_ext + 1;
34 char *varext = malloc(len);
39 strcpy(varext + len_var, ext);
43 static void mark_ram_allocated(int bank, u64 allocated_start, u64 allocated_end)
45 u64 bank_start = tegra_mem_map[bank].virt;
46 u64 bank_size = tegra_mem_map[bank].size;
47 u64 bank_end = bank_start + bank_size;
48 bool keep_front = allocated_start != bank_start;
49 bool keep_tail = allocated_end != bank_end;
51 if (keep_front && keep_tail) {
53 * There are CONFIG_NR_DRAM_BANKS DRAM entries in the array,
54 * starting at index 1 (index 0 is MMIO). So, we are at DRAM
55 * entry "bank" not "bank - 1" as for a typical 0-base array.
56 * The number of remaining DRAM entries is therefore
57 * "CONFIG_NR_DRAM_BANKS - bank". We want to duplicate the
58 * current entry and shift up the remaining entries, dropping
59 * the last one. Thus, we must copy one fewer entry than the
62 memmove(&tegra_mem_map[bank + 1], &tegra_mem_map[bank],
63 CONFIG_NR_DRAM_BANKS - bank - 1);
64 tegra_mem_map[bank].size = allocated_start - bank_start;
66 tegra_mem_map[bank].virt = allocated_end;
67 tegra_mem_map[bank].phys = allocated_end;
68 tegra_mem_map[bank].size = bank_end - allocated_end;
69 } else if (keep_front) {
70 tegra_mem_map[bank].size = allocated_start - bank_start;
71 } else if (keep_tail) {
72 tegra_mem_map[bank].virt = allocated_end;
73 tegra_mem_map[bank].phys = allocated_end;
74 tegra_mem_map[bank].size = bank_end - allocated_end;
77 * We could move all subsequent banks down in the array but
78 * that's not necessary for subsequent allocations to work, so
81 tegra_mem_map[bank].size = 0;
85 static void reserve_ram(u64 start, u64 size)
88 u64 end = start + size;
90 for (bank = 1; bank <= CONFIG_NR_DRAM_BANKS; bank++) {
91 u64 bank_start = tegra_mem_map[bank].virt;
92 u64 bank_size = tegra_mem_map[bank].size;
93 u64 bank_end = bank_start + bank_size;
95 if (end <= bank_start || start > bank_end)
97 mark_ram_allocated(bank, start, end);
102 static u64 alloc_ram(u64 size, u64 align, u64 offset)
106 for (bank = 1; bank <= CONFIG_NR_DRAM_BANKS; bank++) {
107 u64 bank_start = tegra_mem_map[bank].virt;
108 u64 bank_size = tegra_mem_map[bank].size;
109 u64 bank_end = bank_start + bank_size;
110 u64 allocated = ROUND(bank_start, align) + offset;
111 u64 allocated_end = allocated + size;
113 if (allocated_end > bank_end)
115 mark_ram_allocated(bank, allocated, allocated_end);
121 static void set_calculated_aliases(char *aliases, u64 address)
126 aliases = strdup(aliases);
128 pr_err("strdup(aliases) failed");
134 alias = strsep(&tmp, " ");
137 debug("%s: alias: %s\n", __func__, alias);
138 err = env_set_hex(alias, address);
140 pr_err("Could not set %s\n", alias);
146 static void set_calculated_env_var(const char *var)
159 var_size = gen_varname(var, "_size");
162 var_align = gen_varname(var, "_align");
164 goto out_free_var_size;
165 var_offset = gen_varname(var, "_offset");
167 goto out_free_var_align;
168 var_aliases = gen_varname(var, "_aliases");
170 goto out_free_var_offset;
172 size = env_get_hex(var_size, 0);
174 pr_err("%s not set or zero\n", var_size);
175 goto out_free_var_aliases;
177 align = env_get_hex(var_align, 1);
178 /* Handle extant variables, but with a value of 0 */
181 offset = env_get_hex(var_offset, 0);
182 aliases = env_get(var_aliases);
184 debug("%s: Calc var %s; size=%llx, align=%llx, offset=%llx\n",
185 __func__, var, size, align, offset);
187 debug("%s: Aliases: %s\n", __func__, aliases);
189 address = alloc_ram(size, align, offset);
191 pr_err("Could not allocate %s\n", var);
192 goto out_free_var_aliases;
194 debug("%s: Address %llx\n", __func__, address);
196 err = env_set_hex(var, address);
198 pr_err("Could not set %s\n", var);
200 set_calculated_aliases(aliases, address);
202 out_free_var_aliases:
213 static void dump_ram_banks(void)
217 for (bank = 1; bank <= CONFIG_NR_DRAM_BANKS; bank++) {
218 u64 bank_start = tegra_mem_map[bank].virt;
219 u64 bank_size = tegra_mem_map[bank].size;
220 u64 bank_end = bank_start + bank_size;
224 printf("%d: %010llx..%010llx (+%010llx)\n", bank - 1,
225 bank_start, bank_end, bank_size);
230 static void set_calculated_env_vars(void)
232 char *vars, *tmp, *var;
235 printf("RAM banks before any calculated env. var.s:\n");
239 reserve_ram(nvtboot_boot_x0, fdt_totalsize(nvtboot_boot_x0));
242 printf("RAM after reserving cboot DTB:\n");
246 vars = env_get("calculated_vars");
248 debug("%s: No env var calculated_vars\n", __func__);
254 pr_err("strdup(calculated_vars) failed");
260 var = strsep(&tmp, " ");
263 debug("%s: var: %s\n", __func__, var);
264 set_calculated_env_var(var);
266 printf("RAM banks affter allocating %s:\n", var);
274 static int set_fdt_addr(void)
278 ret = env_set_hex("fdt_addr", nvtboot_boot_x0);
280 printf("Failed to set fdt_addr to point at DTB: %d\n", ret);
288 * Attempt to use /chosen/nvidia,ether-mac in the nvtboot DTB to U-Boot's
289 * ethaddr environment variable if possible.
291 static int set_ethaddr_from_nvtboot(void)
293 const void *nvtboot_blob = (void *)nvtboot_boot_x0;
297 /* Already a valid address in the environment? If so, keep it */
298 if (env_get("ethaddr"))
301 node = fdt_path_offset(nvtboot_blob, "/chosen");
303 printf("Can't find /chosen node in nvtboot DTB\n");
306 prop = fdt_getprop(nvtboot_blob, node, "nvidia,ether-mac", &len);
308 printf("Can't find nvidia,ether-mac property in nvtboot DTB\n");
312 ret = env_set("ethaddr", (void *)prop);
314 printf("Failed to set ethaddr from nvtboot DTB: %d\n", ret);
321 int tegra_soc_board_init_late(void)
323 set_calculated_env_vars();
325 * Ignore errors here; the value may not be used depending on
326 * extlinux.conf or boot script content.
329 /* Ignore errors here; not all cases care about Ethernet addresses */
330 set_ethaddr_from_nvtboot();