1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2016-2018, NVIDIA CORPORATION.
8 #include <fdt_support.h>
18 #include <linux/ctype.h>
19 #include <linux/sizes.h>
21 #include <asm/arch/tegra.h>
22 #include <asm/arch-tegra/cboot.h>
23 #include <asm/armv8/mmu.h>
26 * Size of a region that's large enough to hold the relocated U-Boot and all
27 * other allocations made around it (stack, heap, page tables, etc.)
28 * In practice, running "bdinfo" at the shell prompt, the stack reaches about
29 * 5MB from the address selected for ram_top as of the time of writing,
30 * so a 16MB region should be plenty.
32 #define MIN_USABLE_RAM_SIZE SZ_16M
34 * The amount of space we expect to require for stack usage. Used to validate
35 * that all reservations fit into the region selected for the relocation target
37 #define MIN_USABLE_STACK_SIZE SZ_1M
39 DECLARE_GLOBAL_DATA_PTR;
41 extern struct mm_region tegra_mem_map[];
44 * These variables are written to before relocation, and hence cannot be
45 * in.bss, since .bss overlaps the DTB that's appended to the U-Boot binary.
46 * The section attribute forces this into .data and avoids this issue. This
47 * also has the nice side-effect of the content being valid after relocation.
50 /* The number of valid entries in ram_banks[] */
51 static int ram_bank_count __attribute__((section(".data")));
54 * The usable top-of-RAM for U-Boot. This is both:
55 * a) Below 4GB to avoid issues with peripherals that use 32-bit addressing.
56 * b) At the end of a region that has enough space to hold the relocated U-Boot
57 * and all other allocations made around it (stack, heap, page tables, etc.)
59 static u64 ram_top __attribute__((section(".data")));
60 /* The base address of the region of RAM that ends at ram_top */
61 static u64 region_base __attribute__((section(".data")));
64 * Explicitly put this in the .data section because it is written before the
65 * .bss section is zeroed out but it needs to persist.
67 unsigned long cboot_boot_x0 __attribute__((section(".data")));
69 void cboot_save_boot_params(unsigned long x0, unsigned long x1,
70 unsigned long x2, unsigned long x3)
75 int cboot_dram_init(void)
78 const void *cboot_blob = (void *)cboot_boot_x0;
85 na = fdtdec_get_uint(cboot_blob, 0, "#address-cells", 2);
86 ns = fdtdec_get_uint(cboot_blob, 0, "#size-cells", 2);
88 node = fdt_path_offset(cboot_blob, "/memory");
90 pr_err("Can't find /memory node in cboot DTB");
93 prop = fdt_getprop(cboot_blob, node, "reg", &len);
95 pr_err("Can't find /memory/reg property in cboot DTB");
99 /* Calculate the true # of base/size pairs to read */
100 len /= 4; /* Convert bytes to number of cells */
101 len /= (na + ns); /* Convert cells to number of banks */
102 if (len > CONFIG_NR_DRAM_BANKS)
103 len = CONFIG_NR_DRAM_BANKS;
105 /* Parse the /memory node, and save useful entries */
108 for (i = 0; i < len; i++) {
109 u64 bank_start, bank_end, bank_size, usable_bank_size;
111 /* Extract raw memory region data from DTB */
112 bank_start = fdt_read_number(prop, na);
114 bank_size = fdt_read_number(prop, ns);
116 gd->ram_size += bank_size;
117 bank_end = bank_start + bank_size;
118 debug("Bank %d: %llx..%llx (+%llx)\n", i,
119 bank_start, bank_end, bank_size);
122 * Align the bank to MMU section size. This is not strictly
123 * necessary, since the translation table construction code
124 * handles page granularity without issue. However, aligning
125 * the MMU entries reduces the size and number of levels in the
126 * page table, so is worth it.
128 bank_start = ROUND(bank_start, SZ_2M);
129 bank_end = bank_end & ~(SZ_2M - 1);
130 bank_size = bank_end - bank_start;
131 debug(" aligned: %llx..%llx (+%llx)\n",
132 bank_start, bank_end, bank_size);
133 if (bank_end <= bank_start)
136 /* Record data used to create MMU translation tables */
138 /* Index below is deliberately 1-based to skip MMIO entry */
139 tegra_mem_map[ram_bank_count].virt = bank_start;
140 tegra_mem_map[ram_bank_count].phys = bank_start;
141 tegra_mem_map[ram_bank_count].size = bank_size;
142 tegra_mem_map[ram_bank_count].attrs =
143 PTE_BLOCK_MEMTYPE(MT_NORMAL) | PTE_BLOCK_INNER_SHARE;
145 /* Determine best bank to relocate U-Boot into */
146 if (bank_end > SZ_4G)
148 debug(" end %llx (usable)\n", bank_end);
149 usable_bank_size = bank_end - bank_start;
150 debug(" size %llx (usable)\n", usable_bank_size);
151 if ((usable_bank_size >= MIN_USABLE_RAM_SIZE) &&
152 (bank_end > ram_top)) {
154 region_base = bank_start;
155 debug("ram top now %llx\n", ram_top);
159 /* Ensure memory map contains the desired sentinel entry */
160 tegra_mem_map[ram_bank_count + 1].virt = 0;
161 tegra_mem_map[ram_bank_count + 1].phys = 0;
162 tegra_mem_map[ram_bank_count + 1].size = 0;
163 tegra_mem_map[ram_bank_count + 1].attrs = 0;
165 /* Error out if a relocation target couldn't be found */
167 pr_err("Can't find a usable RAM top");
174 int cboot_dram_init_banksize(void)
178 if (ram_bank_count == 0)
181 if ((gd->start_addr_sp - region_base) < MIN_USABLE_STACK_SIZE) {
182 pr_err("Reservations exceed chosen region size");
186 for (i = 0; i < ram_bank_count; i++) {
187 gd->bd->bi_dram[i].start = tegra_mem_map[1 + i].virt;
188 gd->bd->bi_dram[i].size = tegra_mem_map[1 + i].size;
192 gd->pci_ram_top = ram_top;
198 ulong cboot_get_usable_ram_top(ulong total_size)
204 * The following few functions run late during the boot process and dynamically
205 * calculate the load address of various binaries. To keep track of multiple
206 * allocations, some writable list of RAM banks must be used. tegra_mem_map[]
207 * is used for this purpose to avoid making yet another copy of the list of RAM
208 * banks. This is safe because tegra_mem_map[] is only used once during very
209 * early boot to create U-Boot's page tables, long before this code runs. If
210 * this assumption becomes invalid later, we can just fix the code to copy the
211 * list of RAM banks into some private data structure before running.
214 static char *gen_varname(const char *var, const char *ext)
216 size_t len_var = strlen(var);
217 size_t len_ext = strlen(ext);
218 size_t len = len_var + len_ext + 1;
219 char *varext = malloc(len);
224 strcpy(varext + len_var, ext);
228 static void mark_ram_allocated(int bank, u64 allocated_start, u64 allocated_end)
230 u64 bank_start = tegra_mem_map[bank].virt;
231 u64 bank_size = tegra_mem_map[bank].size;
232 u64 bank_end = bank_start + bank_size;
233 bool keep_front = allocated_start != bank_start;
234 bool keep_tail = allocated_end != bank_end;
236 if (keep_front && keep_tail) {
238 * There are CONFIG_NR_DRAM_BANKS DRAM entries in the array,
239 * starting at index 1 (index 0 is MMIO). So, we are at DRAM
240 * entry "bank" not "bank - 1" as for a typical 0-base array.
241 * The number of remaining DRAM entries is therefore
242 * "CONFIG_NR_DRAM_BANKS - bank". We want to duplicate the
243 * current entry and shift up the remaining entries, dropping
244 * the last one. Thus, we must copy one fewer entry than the
247 memmove(&tegra_mem_map[bank + 1], &tegra_mem_map[bank],
248 CONFIG_NR_DRAM_BANKS - bank - 1);
249 tegra_mem_map[bank].size = allocated_start - bank_start;
251 tegra_mem_map[bank].virt = allocated_end;
252 tegra_mem_map[bank].phys = allocated_end;
253 tegra_mem_map[bank].size = bank_end - allocated_end;
254 } else if (keep_front) {
255 tegra_mem_map[bank].size = allocated_start - bank_start;
256 } else if (keep_tail) {
257 tegra_mem_map[bank].virt = allocated_end;
258 tegra_mem_map[bank].phys = allocated_end;
259 tegra_mem_map[bank].size = bank_end - allocated_end;
262 * We could move all subsequent banks down in the array but
263 * that's not necessary for subsequent allocations to work, so
266 tegra_mem_map[bank].size = 0;
270 static void reserve_ram(u64 start, u64 size)
273 u64 end = start + size;
275 for (bank = 1; bank <= CONFIG_NR_DRAM_BANKS; bank++) {
276 u64 bank_start = tegra_mem_map[bank].virt;
277 u64 bank_size = tegra_mem_map[bank].size;
278 u64 bank_end = bank_start + bank_size;
280 if (end <= bank_start || start > bank_end)
282 mark_ram_allocated(bank, start, end);
287 static u64 alloc_ram(u64 size, u64 align, u64 offset)
291 for (bank = 1; bank <= CONFIG_NR_DRAM_BANKS; bank++) {
292 u64 bank_start = tegra_mem_map[bank].virt;
293 u64 bank_size = tegra_mem_map[bank].size;
294 u64 bank_end = bank_start + bank_size;
295 u64 allocated = ROUND(bank_start, align) + offset;
296 u64 allocated_end = allocated + size;
298 if (allocated_end > bank_end)
300 mark_ram_allocated(bank, allocated, allocated_end);
306 static void set_calculated_aliases(char *aliases, u64 address)
311 aliases = strdup(aliases);
313 pr_err("strdup(aliases) failed");
319 alias = strsep(&tmp, " ");
322 debug("%s: alias: %s\n", __func__, alias);
323 err = env_set_hex(alias, address);
325 pr_err("Could not set %s\n", alias);
331 static void set_calculated_env_var(const char *var)
344 var_size = gen_varname(var, "_size");
347 var_align = gen_varname(var, "_align");
349 goto out_free_var_size;
350 var_offset = gen_varname(var, "_offset");
352 goto out_free_var_align;
353 var_aliases = gen_varname(var, "_aliases");
355 goto out_free_var_offset;
357 size = env_get_hex(var_size, 0);
359 pr_err("%s not set or zero\n", var_size);
360 goto out_free_var_aliases;
362 align = env_get_hex(var_align, 1);
363 /* Handle extant variables, but with a value of 0 */
366 offset = env_get_hex(var_offset, 0);
367 aliases = env_get(var_aliases);
369 debug("%s: Calc var %s; size=%llx, align=%llx, offset=%llx\n",
370 __func__, var, size, align, offset);
372 debug("%s: Aliases: %s\n", __func__, aliases);
374 address = alloc_ram(size, align, offset);
376 pr_err("Could not allocate %s\n", var);
377 goto out_free_var_aliases;
379 debug("%s: Address %llx\n", __func__, address);
381 err = env_set_hex(var, address);
383 pr_err("Could not set %s\n", var);
385 set_calculated_aliases(aliases, address);
387 out_free_var_aliases:
398 static void dump_ram_banks(void)
402 for (bank = 1; bank <= CONFIG_NR_DRAM_BANKS; bank++) {
403 u64 bank_start = tegra_mem_map[bank].virt;
404 u64 bank_size = tegra_mem_map[bank].size;
405 u64 bank_end = bank_start + bank_size;
409 printf("%d: %010llx..%010llx (+%010llx)\n", bank - 1,
410 bank_start, bank_end, bank_size);
415 static void set_calculated_env_vars(void)
417 char *vars, *tmp, *var;
420 printf("RAM banks before any calculated env. var.s:\n");
424 reserve_ram(cboot_boot_x0, fdt_totalsize(cboot_boot_x0));
427 printf("RAM after reserving cboot DTB:\n");
431 vars = env_get("calculated_vars");
433 debug("%s: No env var calculated_vars\n", __func__);
439 pr_err("strdup(calculated_vars) failed");
445 var = strsep(&tmp, " ");
448 debug("%s: var: %s\n", __func__, var);
449 set_calculated_env_var(var);
451 printf("RAM banks after allocating %s:\n", var);
459 static int set_fdt_addr(void)
463 ret = env_set_hex("fdt_addr", cboot_boot_x0);
465 printf("Failed to set fdt_addr to point at DTB: %d\n", ret);
473 * Attempt to use /chosen/nvidia,ether-mac in the cboot DTB to U-Boot's
474 * ethaddr environment variable if possible.
476 static int cboot_get_ethaddr_legacy(const void *fdt, uint8_t mac[ETH_ALEN])
478 const char *const properties[] = {
479 "nvidia,ethernet-mac",
486 node = fdt_path_offset(fdt, "/chosen");
488 printf("Can't find /chosen node in cboot DTB\n");
492 for (i = 0; i < ARRAY_SIZE(properties); i++) {
493 prop = fdt_getprop(fdt, node, properties[i], &len);
499 printf("Can't find Ethernet MAC address in cboot DTB\n");
503 string_to_enetaddr(prop, mac);
505 if (!is_valid_ethaddr(mac)) {
506 printf("Invalid MAC address: %s\n", prop);
510 debug("Legacy MAC address: %pM\n", mac);
515 int cboot_get_ethaddr(const void *fdt, uint8_t mac[ETH_ALEN])
517 int node, len, err = 0;
521 path = fdt_get_alias(fdt, "ethernet");
527 debug("ethernet alias found: %s\n", path);
529 node = fdt_path_offset(fdt, path);
535 prop = fdt_getprop(fdt, node, "local-mac-address", &len);
541 if (len != ETH_ALEN) {
546 debug("MAC address: %pM\n", prop);
547 memcpy(mac, prop, ETH_ALEN);
551 err = cboot_get_ethaddr_legacy(fdt, mac);
556 static char *strip(const char *ptr)
560 while (*ptr && isblank(*ptr))
572 while (isblank(*end))
575 return strndup(ptr, end - ptr + 1);
578 static char *cboot_get_bootargs(const void *fdt)
583 offset = fdt_path_offset(fdt, "/chosen");
587 args = fdt_getprop(fdt, offset, "bootargs", &len);
594 int cboot_late_init(void)
596 const void *fdt = (const void *)cboot_boot_x0;
597 uint8_t mac[ETH_ALEN];
601 set_calculated_env_vars();
603 * Ignore errors here; the value may not be used depending on
604 * extlinux.conf or boot script content.
608 /* Ignore errors here; not all cases care about Ethernet addresses */
609 err = cboot_get_ethaddr(fdt, mac);
611 void *blob = (void *)gd->fdt_blob;
613 err = fdtdec_set_ethernet_mac_address(blob, mac, sizeof(mac));
615 printf("failed to set MAC address %pM: %d\n", mac, err);
618 bootargs = cboot_get_bootargs(fdt);
620 env_set("cbootargs", bootargs);