1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2016-2018, NVIDIA CORPORATION.
8 #include <fdt_support.h>
14 #include <linux/ctype.h>
15 #include <linux/sizes.h>
17 #include <asm/arch/tegra.h>
18 #include <asm/arch-tegra/cboot.h>
19 #include <asm/armv8/mmu.h>
22 * Size of a region that's large enough to hold the relocated U-Boot and all
23 * other allocations made around it (stack, heap, page tables, etc.)
24 * In practice, running "bdinfo" at the shell prompt, the stack reaches about
25 * 5MB from the address selected for ram_top as of the time of writing,
26 * so a 16MB region should be plenty.
28 #define MIN_USABLE_RAM_SIZE SZ_16M
30 * The amount of space we expect to require for stack usage. Used to validate
31 * that all reservations fit into the region selected for the relocation target
33 #define MIN_USABLE_STACK_SIZE SZ_1M
35 DECLARE_GLOBAL_DATA_PTR;
37 extern struct mm_region tegra_mem_map[];
40 * These variables are written to before relocation, and hence cannot be
41 * in.bss, since .bss overlaps the DTB that's appended to the U-Boot binary.
42 * The section attribute forces this into .data and avoids this issue. This
43 * also has the nice side-effect of the content being valid after relocation.
46 /* The number of valid entries in ram_banks[] */
47 static int ram_bank_count __attribute__((section(".data")));
50 * The usable top-of-RAM for U-Boot. This is both:
51 * a) Below 4GB to avoid issues with peripherals that use 32-bit addressing.
52 * b) At the end of a region that has enough space to hold the relocated U-Boot
53 * and all other allocations made around it (stack, heap, page tables, etc.)
55 static u64 ram_top __attribute__((section(".data")));
56 /* The base address of the region of RAM that ends at ram_top */
57 static u64 region_base __attribute__((section(".data")));
60 * Explicitly put this in the .data section because it is written before the
61 * .bss section is zeroed out but it needs to persist.
63 unsigned long cboot_boot_x0 __attribute__((section(".data")));
65 void cboot_save_boot_params(unsigned long x0, unsigned long x1,
66 unsigned long x2, unsigned long x3)
71 int cboot_dram_init(void)
74 const void *cboot_blob = (void *)cboot_boot_x0;
81 na = fdtdec_get_uint(cboot_blob, 0, "#address-cells", 2);
82 ns = fdtdec_get_uint(cboot_blob, 0, "#size-cells", 2);
84 node = fdt_path_offset(cboot_blob, "/memory");
86 pr_err("Can't find /memory node in cboot DTB");
89 prop = fdt_getprop(cboot_blob, node, "reg", &len);
91 pr_err("Can't find /memory/reg property in cboot DTB");
95 /* Calculate the true # of base/size pairs to read */
96 len /= 4; /* Convert bytes to number of cells */
97 len /= (na + ns); /* Convert cells to number of banks */
98 if (len > CONFIG_NR_DRAM_BANKS)
99 len = CONFIG_NR_DRAM_BANKS;
101 /* Parse the /memory node, and save useful entries */
104 for (i = 0; i < len; i++) {
105 u64 bank_start, bank_end, bank_size, usable_bank_size;
107 /* Extract raw memory region data from DTB */
108 bank_start = fdt_read_number(prop, na);
110 bank_size = fdt_read_number(prop, ns);
112 gd->ram_size += bank_size;
113 bank_end = bank_start + bank_size;
114 debug("Bank %d: %llx..%llx (+%llx)\n", i,
115 bank_start, bank_end, bank_size);
118 * Align the bank to MMU section size. This is not strictly
119 * necessary, since the translation table construction code
120 * handles page granularity without issue. However, aligning
121 * the MMU entries reduces the size and number of levels in the
122 * page table, so is worth it.
124 bank_start = ROUND(bank_start, SZ_2M);
125 bank_end = bank_end & ~(SZ_2M - 1);
126 bank_size = bank_end - bank_start;
127 debug(" aligned: %llx..%llx (+%llx)\n",
128 bank_start, bank_end, bank_size);
129 if (bank_end <= bank_start)
132 /* Record data used to create MMU translation tables */
134 /* Index below is deliberately 1-based to skip MMIO entry */
135 tegra_mem_map[ram_bank_count].virt = bank_start;
136 tegra_mem_map[ram_bank_count].phys = bank_start;
137 tegra_mem_map[ram_bank_count].size = bank_size;
138 tegra_mem_map[ram_bank_count].attrs =
139 PTE_BLOCK_MEMTYPE(MT_NORMAL) | PTE_BLOCK_INNER_SHARE;
141 /* Determine best bank to relocate U-Boot into */
142 if (bank_end > SZ_4G)
144 debug(" end %llx (usable)\n", bank_end);
145 usable_bank_size = bank_end - bank_start;
146 debug(" size %llx (usable)\n", usable_bank_size);
147 if ((usable_bank_size >= MIN_USABLE_RAM_SIZE) &&
148 (bank_end > ram_top)) {
150 region_base = bank_start;
151 debug("ram top now %llx\n", ram_top);
155 /* Ensure memory map contains the desired sentinel entry */
156 tegra_mem_map[ram_bank_count + 1].virt = 0;
157 tegra_mem_map[ram_bank_count + 1].phys = 0;
158 tegra_mem_map[ram_bank_count + 1].size = 0;
159 tegra_mem_map[ram_bank_count + 1].attrs = 0;
161 /* Error out if a relocation target couldn't be found */
163 pr_err("Can't find a usable RAM top");
170 int cboot_dram_init_banksize(void)
174 if (ram_bank_count == 0)
177 if ((gd->start_addr_sp - region_base) < MIN_USABLE_STACK_SIZE) {
178 pr_err("Reservations exceed chosen region size");
182 for (i = 0; i < ram_bank_count; i++) {
183 gd->bd->bi_dram[i].start = tegra_mem_map[1 + i].virt;
184 gd->bd->bi_dram[i].size = tegra_mem_map[1 + i].size;
188 gd->pci_ram_top = ram_top;
194 ulong cboot_get_usable_ram_top(ulong total_size)
200 * The following few functions run late during the boot process and dynamically
201 * calculate the load address of various binaries. To keep track of multiple
202 * allocations, some writable list of RAM banks must be used. tegra_mem_map[]
203 * is used for this purpose to avoid making yet another copy of the list of RAM
204 * banks. This is safe because tegra_mem_map[] is only used once during very
205 * early boot to create U-Boot's page tables, long before this code runs. If
206 * this assumption becomes invalid later, we can just fix the code to copy the
207 * list of RAM banks into some private data structure before running.
210 static char *gen_varname(const char *var, const char *ext)
212 size_t len_var = strlen(var);
213 size_t len_ext = strlen(ext);
214 size_t len = len_var + len_ext + 1;
215 char *varext = malloc(len);
220 strcpy(varext + len_var, ext);
224 static void mark_ram_allocated(int bank, u64 allocated_start, u64 allocated_end)
226 u64 bank_start = tegra_mem_map[bank].virt;
227 u64 bank_size = tegra_mem_map[bank].size;
228 u64 bank_end = bank_start + bank_size;
229 bool keep_front = allocated_start != bank_start;
230 bool keep_tail = allocated_end != bank_end;
232 if (keep_front && keep_tail) {
234 * There are CONFIG_NR_DRAM_BANKS DRAM entries in the array,
235 * starting at index 1 (index 0 is MMIO). So, we are at DRAM
236 * entry "bank" not "bank - 1" as for a typical 0-base array.
237 * The number of remaining DRAM entries is therefore
238 * "CONFIG_NR_DRAM_BANKS - bank". We want to duplicate the
239 * current entry and shift up the remaining entries, dropping
240 * the last one. Thus, we must copy one fewer entry than the
243 memmove(&tegra_mem_map[bank + 1], &tegra_mem_map[bank],
244 CONFIG_NR_DRAM_BANKS - bank - 1);
245 tegra_mem_map[bank].size = allocated_start - bank_start;
247 tegra_mem_map[bank].virt = allocated_end;
248 tegra_mem_map[bank].phys = allocated_end;
249 tegra_mem_map[bank].size = bank_end - allocated_end;
250 } else if (keep_front) {
251 tegra_mem_map[bank].size = allocated_start - bank_start;
252 } else if (keep_tail) {
253 tegra_mem_map[bank].virt = allocated_end;
254 tegra_mem_map[bank].phys = allocated_end;
255 tegra_mem_map[bank].size = bank_end - allocated_end;
258 * We could move all subsequent banks down in the array but
259 * that's not necessary for subsequent allocations to work, so
262 tegra_mem_map[bank].size = 0;
266 static void reserve_ram(u64 start, u64 size)
269 u64 end = start + size;
271 for (bank = 1; bank <= CONFIG_NR_DRAM_BANKS; bank++) {
272 u64 bank_start = tegra_mem_map[bank].virt;
273 u64 bank_size = tegra_mem_map[bank].size;
274 u64 bank_end = bank_start + bank_size;
276 if (end <= bank_start || start > bank_end)
278 mark_ram_allocated(bank, start, end);
283 static u64 alloc_ram(u64 size, u64 align, u64 offset)
287 for (bank = 1; bank <= CONFIG_NR_DRAM_BANKS; bank++) {
288 u64 bank_start = tegra_mem_map[bank].virt;
289 u64 bank_size = tegra_mem_map[bank].size;
290 u64 bank_end = bank_start + bank_size;
291 u64 allocated = ROUND(bank_start, align) + offset;
292 u64 allocated_end = allocated + size;
294 if (allocated_end > bank_end)
296 mark_ram_allocated(bank, allocated, allocated_end);
302 static void set_calculated_aliases(char *aliases, u64 address)
307 aliases = strdup(aliases);
309 pr_err("strdup(aliases) failed");
315 alias = strsep(&tmp, " ");
318 debug("%s: alias: %s\n", __func__, alias);
319 err = env_set_hex(alias, address);
321 pr_err("Could not set %s\n", alias);
327 static void set_calculated_env_var(const char *var)
340 var_size = gen_varname(var, "_size");
343 var_align = gen_varname(var, "_align");
345 goto out_free_var_size;
346 var_offset = gen_varname(var, "_offset");
348 goto out_free_var_align;
349 var_aliases = gen_varname(var, "_aliases");
351 goto out_free_var_offset;
353 size = env_get_hex(var_size, 0);
355 pr_err("%s not set or zero\n", var_size);
356 goto out_free_var_aliases;
358 align = env_get_hex(var_align, 1);
359 /* Handle extant variables, but with a value of 0 */
362 offset = env_get_hex(var_offset, 0);
363 aliases = env_get(var_aliases);
365 debug("%s: Calc var %s; size=%llx, align=%llx, offset=%llx\n",
366 __func__, var, size, align, offset);
368 debug("%s: Aliases: %s\n", __func__, aliases);
370 address = alloc_ram(size, align, offset);
372 pr_err("Could not allocate %s\n", var);
373 goto out_free_var_aliases;
375 debug("%s: Address %llx\n", __func__, address);
377 err = env_set_hex(var, address);
379 pr_err("Could not set %s\n", var);
381 set_calculated_aliases(aliases, address);
383 out_free_var_aliases:
394 static void dump_ram_banks(void)
398 for (bank = 1; bank <= CONFIG_NR_DRAM_BANKS; bank++) {
399 u64 bank_start = tegra_mem_map[bank].virt;
400 u64 bank_size = tegra_mem_map[bank].size;
401 u64 bank_end = bank_start + bank_size;
405 printf("%d: %010llx..%010llx (+%010llx)\n", bank - 1,
406 bank_start, bank_end, bank_size);
411 static void set_calculated_env_vars(void)
413 char *vars, *tmp, *var;
416 printf("RAM banks before any calculated env. var.s:\n");
420 reserve_ram(cboot_boot_x0, fdt_totalsize(cboot_boot_x0));
423 printf("RAM after reserving cboot DTB:\n");
427 vars = env_get("calculated_vars");
429 debug("%s: No env var calculated_vars\n", __func__);
435 pr_err("strdup(calculated_vars) failed");
441 var = strsep(&tmp, " ");
444 debug("%s: var: %s\n", __func__, var);
445 set_calculated_env_var(var);
447 printf("RAM banks after allocating %s:\n", var);
455 static int set_fdt_addr(void)
459 ret = env_set_hex("fdt_addr", cboot_boot_x0);
461 printf("Failed to set fdt_addr to point at DTB: %d\n", ret);
469 * Attempt to use /chosen/nvidia,ether-mac in the cboot DTB to U-Boot's
470 * ethaddr environment variable if possible.
472 static int cboot_get_ethaddr_legacy(const void *fdt, uint8_t mac[ETH_ALEN])
474 const char *const properties[] = {
475 "nvidia,ethernet-mac",
482 node = fdt_path_offset(fdt, "/chosen");
484 printf("Can't find /chosen node in cboot DTB\n");
488 for (i = 0; i < ARRAY_SIZE(properties); i++) {
489 prop = fdt_getprop(fdt, node, properties[i], &len);
495 printf("Can't find Ethernet MAC address in cboot DTB\n");
499 string_to_enetaddr(prop, mac);
501 if (!is_valid_ethaddr(mac)) {
502 printf("Invalid MAC address: %s\n", prop);
506 debug("Legacy MAC address: %pM\n", mac);
511 int cboot_get_ethaddr(const void *fdt, uint8_t mac[ETH_ALEN])
513 int node, len, err = 0;
517 path = fdt_get_alias(fdt, "ethernet");
523 debug("ethernet alias found: %s\n", path);
525 node = fdt_path_offset(fdt, path);
531 prop = fdt_getprop(fdt, node, "local-mac-address", &len);
537 if (len != ETH_ALEN) {
542 debug("MAC address: %pM\n", prop);
543 memcpy(mac, prop, ETH_ALEN);
547 err = cboot_get_ethaddr_legacy(fdt, mac);
552 static char *strip(const char *ptr)
556 while (*ptr && isblank(*ptr))
568 while (isblank(*end))
571 return strndup(ptr, end - ptr + 1);
574 static char *cboot_get_bootargs(const void *fdt)
579 offset = fdt_path_offset(fdt, "/chosen");
583 args = fdt_getprop(fdt, offset, "bootargs", &len);
590 int cboot_late_init(void)
592 const void *fdt = (const void *)cboot_boot_x0;
593 uint8_t mac[ETH_ALEN];
597 set_calculated_env_vars();
599 * Ignore errors here; the value may not be used depending on
600 * extlinux.conf or boot script content.
604 /* Ignore errors here; not all cases care about Ethernet addresses */
605 err = cboot_get_ethaddr(fdt, mac);
607 void *blob = (void *)gd->fdt_blob;
609 err = fdtdec_set_ethernet_mac_address(blob, mac, sizeof(mac));
611 printf("failed to set MAC address %pM: %d\n", mac, err);
614 bootargs = cboot_get_bootargs(fdt);
616 env_set("cbootargs", bootargs);