1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2016-2018, NVIDIA CORPORATION.
7 #include <environment.h>
8 #include <fdt_support.h>
12 #include <linux/sizes.h>
14 #include <asm/arch/tegra.h>
15 #include <asm/arch-tegra/cboot.h>
16 #include <asm/armv8/mmu.h>
19 * Size of a region that's large enough to hold the relocated U-Boot and all
20 * other allocations made around it (stack, heap, page tables, etc.)
21 * In practice, running "bdinfo" at the shell prompt, the stack reaches about
22 * 5MB from the address selected for ram_top as of the time of writing,
23 * so a 16MB region should be plenty.
25 #define MIN_USABLE_RAM_SIZE SZ_16M
27 * The amount of space we expect to require for stack usage. Used to validate
28 * that all reservations fit into the region selected for the relocation target
30 #define MIN_USABLE_STACK_SIZE SZ_1M
32 DECLARE_GLOBAL_DATA_PTR;
34 extern struct mm_region tegra_mem_map[];
37 * These variables are written to before relocation, and hence cannot be
38 * in.bss, since .bss overlaps the DTB that's appended to the U-Boot binary.
39 * The section attribute forces this into .data and avoids this issue. This
40 * also has the nice side-effect of the content being valid after relocation.
43 /* The number of valid entries in ram_banks[] */
44 static int ram_bank_count __attribute__((section(".data")));
47 * The usable top-of-RAM for U-Boot. This is both:
48 * a) Below 4GB to avoid issues with peripherals that use 32-bit addressing.
49 * b) At the end of a region that has enough space to hold the relocated U-Boot
50 * and all other allocations made around it (stack, heap, page tables, etc.)
52 static u64 ram_top __attribute__((section(".data")));
53 /* The base address of the region of RAM that ends at ram_top */
54 static u64 region_base __attribute__((section(".data")));
57 * Explicitly put this in the .data section because it is written before the
58 * .bss section is zeroed out but it needs to persist.
60 unsigned long cboot_boot_x0 __attribute__((section(".data")));
62 void cboot_save_boot_params(unsigned long x0, unsigned long x1,
63 unsigned long x2, unsigned long x3)
68 int cboot_dram_init(void)
71 const void *cboot_blob = (void *)cboot_boot_x0;
78 na = fdtdec_get_uint(cboot_blob, 0, "#address-cells", 2);
79 ns = fdtdec_get_uint(cboot_blob, 0, "#size-cells", 2);
81 node = fdt_path_offset(cboot_blob, "/memory");
83 pr_err("Can't find /memory node in cboot DTB");
86 prop = fdt_getprop(cboot_blob, node, "reg", &len);
88 pr_err("Can't find /memory/reg property in cboot DTB");
92 /* Calculate the true # of base/size pairs to read */
93 len /= 4; /* Convert bytes to number of cells */
94 len /= (na + ns); /* Convert cells to number of banks */
95 if (len > CONFIG_NR_DRAM_BANKS)
96 len = CONFIG_NR_DRAM_BANKS;
98 /* Parse the /memory node, and save useful entries */
101 for (i = 0; i < len; i++) {
102 u64 bank_start, bank_end, bank_size, usable_bank_size;
104 /* Extract raw memory region data from DTB */
105 bank_start = fdt_read_number(prop, na);
107 bank_size = fdt_read_number(prop, ns);
109 gd->ram_size += bank_size;
110 bank_end = bank_start + bank_size;
111 debug("Bank %d: %llx..%llx (+%llx)\n", i,
112 bank_start, bank_end, bank_size);
115 * Align the bank to MMU section size. This is not strictly
116 * necessary, since the translation table construction code
117 * handles page granularity without issue. However, aligning
118 * the MMU entries reduces the size and number of levels in the
119 * page table, so is worth it.
121 bank_start = ROUND(bank_start, SZ_2M);
122 bank_end = bank_end & ~(SZ_2M - 1);
123 bank_size = bank_end - bank_start;
124 debug(" aligned: %llx..%llx (+%llx)\n",
125 bank_start, bank_end, bank_size);
126 if (bank_end <= bank_start)
129 /* Record data used to create MMU translation tables */
131 /* Index below is deliberately 1-based to skip MMIO entry */
132 tegra_mem_map[ram_bank_count].virt = bank_start;
133 tegra_mem_map[ram_bank_count].phys = bank_start;
134 tegra_mem_map[ram_bank_count].size = bank_size;
135 tegra_mem_map[ram_bank_count].attrs =
136 PTE_BLOCK_MEMTYPE(MT_NORMAL) | PTE_BLOCK_INNER_SHARE;
138 /* Determine best bank to relocate U-Boot into */
139 if (bank_end > SZ_4G)
141 debug(" end %llx (usable)\n", bank_end);
142 usable_bank_size = bank_end - bank_start;
143 debug(" size %llx (usable)\n", usable_bank_size);
144 if ((usable_bank_size >= MIN_USABLE_RAM_SIZE) &&
145 (bank_end > ram_top)) {
147 region_base = bank_start;
148 debug("ram top now %llx\n", ram_top);
152 /* Ensure memory map contains the desired sentinel entry */
153 tegra_mem_map[ram_bank_count + 1].virt = 0;
154 tegra_mem_map[ram_bank_count + 1].phys = 0;
155 tegra_mem_map[ram_bank_count + 1].size = 0;
156 tegra_mem_map[ram_bank_count + 1].attrs = 0;
158 /* Error out if a relocation target couldn't be found */
160 pr_err("Can't find a usable RAM top");
167 int cboot_dram_init_banksize(void)
171 if (ram_bank_count == 0)
174 if ((gd->start_addr_sp - region_base) < MIN_USABLE_STACK_SIZE) {
175 pr_err("Reservations exceed chosen region size");
179 for (i = 0; i < ram_bank_count; i++) {
180 gd->bd->bi_dram[i].start = tegra_mem_map[1 + i].virt;
181 gd->bd->bi_dram[i].size = tegra_mem_map[1 + i].size;
185 gd->pci_ram_top = ram_top;
191 ulong cboot_get_usable_ram_top(ulong total_size)
197 * The following few functions run late during the boot process and dynamically
198 * calculate the load address of various binaries. To keep track of multiple
199 * allocations, some writable list of RAM banks must be used. tegra_mem_map[]
200 * is used for this purpose to avoid making yet another copy of the list of RAM
201 * banks. This is safe because tegra_mem_map[] is only used once during very
202 * early boot to create U-Boot's page tables, long before this code runs. If
203 * this assumption becomes invalid later, we can just fix the code to copy the
204 * list of RAM banks into some private data structure before running.
207 static char *gen_varname(const char *var, const char *ext)
209 size_t len_var = strlen(var);
210 size_t len_ext = strlen(ext);
211 size_t len = len_var + len_ext + 1;
212 char *varext = malloc(len);
217 strcpy(varext + len_var, ext);
221 static void mark_ram_allocated(int bank, u64 allocated_start, u64 allocated_end)
223 u64 bank_start = tegra_mem_map[bank].virt;
224 u64 bank_size = tegra_mem_map[bank].size;
225 u64 bank_end = bank_start + bank_size;
226 bool keep_front = allocated_start != bank_start;
227 bool keep_tail = allocated_end != bank_end;
229 if (keep_front && keep_tail) {
231 * There are CONFIG_NR_DRAM_BANKS DRAM entries in the array,
232 * starting at index 1 (index 0 is MMIO). So, we are at DRAM
233 * entry "bank" not "bank - 1" as for a typical 0-base array.
234 * The number of remaining DRAM entries is therefore
235 * "CONFIG_NR_DRAM_BANKS - bank". We want to duplicate the
236 * current entry and shift up the remaining entries, dropping
237 * the last one. Thus, we must copy one fewer entry than the
240 memmove(&tegra_mem_map[bank + 1], &tegra_mem_map[bank],
241 CONFIG_NR_DRAM_BANKS - bank - 1);
242 tegra_mem_map[bank].size = allocated_start - bank_start;
244 tegra_mem_map[bank].virt = allocated_end;
245 tegra_mem_map[bank].phys = allocated_end;
246 tegra_mem_map[bank].size = bank_end - allocated_end;
247 } else if (keep_front) {
248 tegra_mem_map[bank].size = allocated_start - bank_start;
249 } else if (keep_tail) {
250 tegra_mem_map[bank].virt = allocated_end;
251 tegra_mem_map[bank].phys = allocated_end;
252 tegra_mem_map[bank].size = bank_end - allocated_end;
255 * We could move all subsequent banks down in the array but
256 * that's not necessary for subsequent allocations to work, so
259 tegra_mem_map[bank].size = 0;
263 static void reserve_ram(u64 start, u64 size)
266 u64 end = start + size;
268 for (bank = 1; bank <= CONFIG_NR_DRAM_BANKS; bank++) {
269 u64 bank_start = tegra_mem_map[bank].virt;
270 u64 bank_size = tegra_mem_map[bank].size;
271 u64 bank_end = bank_start + bank_size;
273 if (end <= bank_start || start > bank_end)
275 mark_ram_allocated(bank, start, end);
280 static u64 alloc_ram(u64 size, u64 align, u64 offset)
284 for (bank = 1; bank <= CONFIG_NR_DRAM_BANKS; bank++) {
285 u64 bank_start = tegra_mem_map[bank].virt;
286 u64 bank_size = tegra_mem_map[bank].size;
287 u64 bank_end = bank_start + bank_size;
288 u64 allocated = ROUND(bank_start, align) + offset;
289 u64 allocated_end = allocated + size;
291 if (allocated_end > bank_end)
293 mark_ram_allocated(bank, allocated, allocated_end);
299 static void set_calculated_aliases(char *aliases, u64 address)
304 aliases = strdup(aliases);
306 pr_err("strdup(aliases) failed");
312 alias = strsep(&tmp, " ");
315 debug("%s: alias: %s\n", __func__, alias);
316 err = env_set_hex(alias, address);
318 pr_err("Could not set %s\n", alias);
324 static void set_calculated_env_var(const char *var)
337 var_size = gen_varname(var, "_size");
340 var_align = gen_varname(var, "_align");
342 goto out_free_var_size;
343 var_offset = gen_varname(var, "_offset");
345 goto out_free_var_align;
346 var_aliases = gen_varname(var, "_aliases");
348 goto out_free_var_offset;
350 size = env_get_hex(var_size, 0);
352 pr_err("%s not set or zero\n", var_size);
353 goto out_free_var_aliases;
355 align = env_get_hex(var_align, 1);
356 /* Handle extant variables, but with a value of 0 */
359 offset = env_get_hex(var_offset, 0);
360 aliases = env_get(var_aliases);
362 debug("%s: Calc var %s; size=%llx, align=%llx, offset=%llx\n",
363 __func__, var, size, align, offset);
365 debug("%s: Aliases: %s\n", __func__, aliases);
367 address = alloc_ram(size, align, offset);
369 pr_err("Could not allocate %s\n", var);
370 goto out_free_var_aliases;
372 debug("%s: Address %llx\n", __func__, address);
374 err = env_set_hex(var, address);
376 pr_err("Could not set %s\n", var);
378 set_calculated_aliases(aliases, address);
380 out_free_var_aliases:
391 static void dump_ram_banks(void)
395 for (bank = 1; bank <= CONFIG_NR_DRAM_BANKS; bank++) {
396 u64 bank_start = tegra_mem_map[bank].virt;
397 u64 bank_size = tegra_mem_map[bank].size;
398 u64 bank_end = bank_start + bank_size;
402 printf("%d: %010llx..%010llx (+%010llx)\n", bank - 1,
403 bank_start, bank_end, bank_size);
408 static void set_calculated_env_vars(void)
410 char *vars, *tmp, *var;
413 printf("RAM banks before any calculated env. var.s:\n");
417 reserve_ram(cboot_boot_x0, fdt_totalsize(cboot_boot_x0));
420 printf("RAM after reserving cboot DTB:\n");
424 vars = env_get("calculated_vars");
426 debug("%s: No env var calculated_vars\n", __func__);
432 pr_err("strdup(calculated_vars) failed");
438 var = strsep(&tmp, " ");
441 debug("%s: var: %s\n", __func__, var);
442 set_calculated_env_var(var);
444 printf("RAM banks after allocating %s:\n", var);
452 static int set_fdt_addr(void)
456 ret = env_set_hex("fdt_addr", cboot_boot_x0);
458 printf("Failed to set fdt_addr to point at DTB: %d\n", ret);
466 * Attempt to use /chosen/nvidia,ether-mac in the cboot DTB to U-Boot's
467 * ethaddr environment variable if possible.
469 static int cboot_get_ethaddr_legacy(const void *fdt, uint8_t mac[ETH_ALEN])
471 const char *const properties[] = {
472 "nvidia,ethernet-mac",
479 node = fdt_path_offset(fdt, "/chosen");
481 printf("Can't find /chosen node in cboot DTB\n");
485 for (i = 0; i < ARRAY_SIZE(properties); i++) {
486 prop = fdt_getprop(fdt, node, properties[i], &len);
492 printf("Can't find Ethernet MAC address in cboot DTB\n");
496 eth_parse_enetaddr(prop, mac);
498 if (!is_valid_ethaddr(mac)) {
499 printf("Invalid MAC address: %s\n", prop);
503 debug("Legacy MAC address: %pM\n", mac);
508 int cboot_get_ethaddr(const void *fdt, uint8_t mac[ETH_ALEN])
510 int node, len, err = 0;
514 path = fdt_get_alias(fdt, "ethernet");
520 debug("ethernet alias found: %s\n", path);
522 node = fdt_path_offset(fdt, path);
528 prop = fdt_getprop(fdt, node, "local-mac-address", &len);
534 if (len != ETH_ALEN) {
539 debug("MAC address: %pM\n", prop);
540 memcpy(mac, prop, ETH_ALEN);
544 err = cboot_get_ethaddr_legacy(fdt, mac);
549 int cboot_late_init(void)
551 const void *fdt = (const void *)cboot_boot_x0;
552 uint8_t mac[ETH_ALEN];
555 set_calculated_env_vars();
557 * Ignore errors here; the value may not be used depending on
558 * extlinux.conf or boot script content.
562 /* Ignore errors here; not all cases care about Ethernet addresses */
563 err = cboot_get_ethaddr(fdt, mac);
565 void *blob = (void *)gd->fdt_blob;
567 err = fdtdec_set_ethernet_mac_address(blob, mac, sizeof(mac));
569 printf("failed to set MAC address %pM: %d\n", mac, err);