u-boot/arch/arm/mach-tegra/tegra186/nvtboot_board.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

332 lines
7.9 KiB
C

// 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;
}