u-boot/arch/arm/mach-tegra/tegra186/nvtboot_board.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2016-2018, NVIDIA CORPORATION.
*/
#include <stdlib.h>
#include <common.h>
#include <fdt_support.h>
#include <fdtdec.h>
#include <asm/arch/tegra.h>
#include <asm/armv8/mmu.h>
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;
ret = env_set_hex("fdt_addr", nvtboot_boot_x0);
if (ret) {
printf("Failed to set fdt_addr to point at DTB: %d\n", ret);
return ret;
}
return 0;
}
/*
* Attempt to use /chosen/nvidia,ether-mac in the nvtboot DTB to U-Boot's
* ethaddr environment variable if possible.
*/
static int set_ethaddr_from_nvtboot(void)
{
const void *nvtboot_blob = (void *)nvtboot_boot_x0;
int ret, node, len;
const u32 *prop;
/* Already a valid address in the environment? If so, keep it */
if (env_get("ethaddr"))
return 0;
node = fdt_path_offset(nvtboot_blob, "/chosen");
if (node < 0) {
printf("Can't find /chosen node in nvtboot DTB\n");
return node;
}
prop = fdt_getprop(nvtboot_blob, node, "nvidia,ether-mac", &len);
if (!prop) {
printf("Can't find nvidia,ether-mac property in nvtboot DTB\n");
return -ENOENT;
}
ret = env_set("ethaddr", (void *)prop);
if (ret) {
printf("Failed to set ethaddr from nvtboot DTB: %d\n", ret);
return ret;
}
return 0;
}
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.
*/
set_fdt_addr();
/* Ignore errors here; not all cases care about Ethernet addresses */
set_ethaddr_from_nvtboot();
return 0;
}