/*
- * Copyright (c) 2016, NVIDIA CORPORATION.
+ * Copyright (c) 2016-2018, NVIDIA CORPORATION.
*
* SPDX-License-Identifier: GPL-2.0+
*/
+#include <stdlib.h>
#include <common.h>
#include <fdt_support.h>
#include <fdtdec.h>
#include <asm/arch/tegra.h>
+#include <asm/armv8/mmu.h>
+
+DECLARE_GLOBAL_DATA_PTR;
extern unsigned long nvtboot_boot_x0;
+/*
+ * The following few functions run late during the boot process and dynamically
+ * calculate the load address of various binaries. To keep track of multiple
+ * allocations, some writable list of RAM banks must be used. tegra_mem_map[]
+ * is used for this purpose to avoid making yet another copy of the list of RAM
+ * banks. This is safe because tegra_mem_map[] is only used once during very
+ * early boot to create U-Boot's page tables, long before this code runs. If
+ * this assumption becomes invalid later, we can just fix the code to copy the
+ * list of RAM banks into some private data structure before running.
+ */
+
+extern struct mm_region tegra_mem_map[];
+
+static char *gen_varname(const char *var, const char *ext)
+{
+ size_t len_var = strlen(var);
+ size_t len_ext = strlen(ext);
+ size_t len = len_var + len_ext + 1;
+ char *varext = malloc(len);
+
+ if (!varext)
+ return 0;
+ strcpy(varext, var);
+ strcpy(varext + len_var, ext);
+ return varext;
+}
+
+static void mark_ram_allocated(int bank, u64 allocated_start, u64 allocated_end)
+{
+ u64 bank_start = tegra_mem_map[bank].virt;
+ u64 bank_size = tegra_mem_map[bank].size;
+ u64 bank_end = bank_start + bank_size;
+ bool keep_front = allocated_start != bank_start;
+ bool keep_tail = allocated_end != bank_end;
+
+ if (keep_front && keep_tail) {
+ /*
+ * There are CONFIG_NR_DRAM_BANKS DRAM entries in the array,
+ * starting at index 1 (index 0 is MMIO). So, we are at DRAM
+ * entry "bank" not "bank - 1" as for a typical 0-base array.
+ * The number of remaining DRAM entries is therefore
+ * "CONFIG_NR_DRAM_BANKS - bank". We want to duplicate the
+ * current entry and shift up the remaining entries, dropping
+ * the last one. Thus, we must copy one fewer entry than the
+ * number remaining.
+ */
+ memmove(&tegra_mem_map[bank + 1], &tegra_mem_map[bank],
+ CONFIG_NR_DRAM_BANKS - bank - 1);
+ tegra_mem_map[bank].size = allocated_start - bank_start;
+ bank++;
+ tegra_mem_map[bank].virt = allocated_end;
+ tegra_mem_map[bank].phys = allocated_end;
+ tegra_mem_map[bank].size = bank_end - allocated_end;
+ } else if (keep_front) {
+ tegra_mem_map[bank].size = allocated_start - bank_start;
+ } else if (keep_tail) {
+ tegra_mem_map[bank].virt = allocated_end;
+ tegra_mem_map[bank].phys = allocated_end;
+ tegra_mem_map[bank].size = bank_end - allocated_end;
+ } else {
+ /*
+ * We could move all subsequent banks down in the array but
+ * that's not necessary for subsequent allocations to work, so
+ * we skip doing so.
+ */
+ tegra_mem_map[bank].size = 0;
+ }
+}
+
+static void reserve_ram(u64 start, u64 size)
+{
+ int bank;
+ u64 end = start + size;
+
+ for (bank = 1; bank <= CONFIG_NR_DRAM_BANKS; bank++) {
+ u64 bank_start = tegra_mem_map[bank].virt;
+ u64 bank_size = tegra_mem_map[bank].size;
+ u64 bank_end = bank_start + bank_size;
+
+ if (end <= bank_start || start > bank_end)
+ continue;
+ mark_ram_allocated(bank, start, end);
+ break;
+ }
+}
+
+static u64 alloc_ram(u64 size, u64 align, u64 offset)
+{
+ int bank;
+
+ for (bank = 1; bank <= CONFIG_NR_DRAM_BANKS; bank++) {
+ u64 bank_start = tegra_mem_map[bank].virt;
+ u64 bank_size = tegra_mem_map[bank].size;
+ u64 bank_end = bank_start + bank_size;
+ u64 allocated = ROUND(bank_start, align) + offset;
+ u64 allocated_end = allocated + size;
+
+ if (allocated_end > bank_end)
+ continue;
+ mark_ram_allocated(bank, allocated, allocated_end);
+ return allocated;
+ }
+ return 0;
+}
+
+static void set_calculated_aliases(char *aliases, u64 address)
+{
+ char *tmp, *alias;
+ int err;
+
+ aliases = strdup(aliases);
+ if (!aliases) {
+ pr_err("strdup(aliases) failed");
+ return;
+ }
+
+ tmp = aliases;
+ while (true) {
+ alias = strsep(&tmp, " ");
+ if (!alias)
+ break;
+ debug("%s: alias: %s\n", __func__, alias);
+ err = env_set_hex(alias, address);
+ if (err)
+ pr_err("Could not set %s\n", alias);
+ }
+
+ free(aliases);
+}
+
+static void set_calculated_env_var(const char *var)
+{
+ char *var_size;
+ char *var_align;
+ char *var_offset;
+ char *var_aliases;
+ u64 size;
+ u64 align;
+ u64 offset;
+ char *aliases;
+ u64 address;
+ int err;
+
+ var_size = gen_varname(var, "_size");
+ if (!var_size)
+ return;
+ var_align = gen_varname(var, "_align");
+ if (!var_align)
+ goto out_free_var_size;
+ var_offset = gen_varname(var, "_offset");
+ if (!var_offset)
+ goto out_free_var_align;
+ var_aliases = gen_varname(var, "_aliases");
+ if (!var_aliases)
+ goto out_free_var_offset;
+
+ size = env_get_hex(var_size, 0);
+ if (!size) {
+ pr_err("%s not set or zero\n", var_size);
+ goto out_free_var_aliases;
+ }
+ align = env_get_hex(var_align, 1);
+ /* Handle extant variables, but with a value of 0 */
+ if (!align)
+ align = 1;
+ offset = env_get_hex(var_offset, 0);
+ aliases = env_get(var_aliases);
+
+ debug("%s: Calc var %s; size=%llx, align=%llx, offset=%llx\n",
+ __func__, var, size, align, offset);
+ if (aliases)
+ debug("%s: Aliases: %s\n", __func__, aliases);
+
+ address = alloc_ram(size, align, offset);
+ if (!address) {
+ pr_err("Could not allocate %s\n", var);
+ goto out_free_var_aliases;
+ }
+ debug("%s: Address %llx\n", __func__, address);
+
+ err = env_set_hex(var, address);
+ if (err)
+ pr_err("Could not set %s\n", var);
+ if (aliases)
+ set_calculated_aliases(aliases, address);
+
+out_free_var_aliases:
+ free(var_aliases);
+out_free_var_offset:
+ free(var_offset);
+out_free_var_align:
+ free(var_align);
+out_free_var_size:
+ free(var_size);
+}
+
+#ifdef DEBUG
+static void dump_ram_banks(void)
+{
+ int bank;
+
+ for (bank = 1; bank <= CONFIG_NR_DRAM_BANKS; bank++) {
+ u64 bank_start = tegra_mem_map[bank].virt;
+ u64 bank_size = tegra_mem_map[bank].size;
+ u64 bank_end = bank_start + bank_size;
+
+ if (!bank_size)
+ continue;
+ printf("%d: %010llx..%010llx (+%010llx)\n", bank - 1,
+ bank_start, bank_end, bank_size);
+ }
+}
+#endif
+
+static void set_calculated_env_vars(void)
+{
+ char *vars, *tmp, *var;
+
+#ifdef DEBUG
+ printf("RAM banks before any calculated env. var.s:\n");
+ dump_ram_banks();
+#endif
+
+ reserve_ram(nvtboot_boot_x0, fdt_totalsize(nvtboot_boot_x0));
+
+#ifdef DEBUG
+ printf("RAM after reserving cboot DTB:\n");
+ dump_ram_banks();
+#endif
+
+ vars = env_get("calculated_vars");
+ if (!vars) {
+ debug("%s: No env var calculated_vars\n", __func__);
+ return;
+ }
+
+ vars = strdup(vars);
+ if (!vars) {
+ pr_err("strdup(calculated_vars) failed");
+ return;
+ }
+
+ tmp = vars;
+ while (true) {
+ var = strsep(&tmp, " ");
+ if (!var)
+ break;
+ debug("%s: var: %s\n", __func__, var);
+ set_calculated_env_var(var);
+#ifdef DEBUG
+ printf("RAM banks affter allocating %s:\n", var);
+ dump_ram_banks();
+#endif
+ }
+
+ free(vars);
+}
+
static int set_fdt_addr(void)
{
int ret;
int tegra_soc_board_init_late(void)
{
+ set_calculated_env_vars();
/*
* Ignore errors here; the value may not be used depending on
* extlinux.conf or boot script content.
projects / platform / kernel / u-boot.git / commitdiff