u-boot/arch/sandbox/cpu/state.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2011-2012 The Chromium OS Authors.
*/
#include <common.h>
#include <errno.h>
#include <fdtdec.h>
#include <os.h>
#include <asm/state.h>
/* Main state record for the sandbox */
static struct sandbox_state main_state;
static struct sandbox_state *state; /* Pointer to current state record */
static int state_ensure_space(int extra_size)
{
void *blob = state->state_fdt;
int used, size, free;
void *buf;
int ret;
used = fdt_off_dt_strings(blob) + fdt_size_dt_strings(blob);
size = fdt_totalsize(blob);
free = size - used;
if (free > extra_size)
return 0;
size = used + extra_size;
buf = os_malloc(size);
if (!buf)
return -ENOMEM;
ret = fdt_open_into(blob, buf, size);
if (ret) {
os_free(buf);
return -EIO;
}
os_free(blob);
state->state_fdt = buf;
return 0;
}
static int state_read_file(struct sandbox_state *state, const char *fname)
{
loff_t size;
int ret;
int fd;
ret = os_get_filesize(fname, &size);
if (ret < 0) {
printf("Cannot find sandbox state file '%s'\n", fname);
return -ENOENT;
}
state->state_fdt = os_malloc(size);
if (!state->state_fdt) {
puts("No memory to read sandbox state\n");
return -ENOMEM;
}
fd = os_open(fname, OS_O_RDONLY);
if (fd < 0) {
printf("Cannot open sandbox state file '%s'\n", fname);
ret = -EPERM;
goto err_open;
}
if (os_read(fd, state->state_fdt, size) != size) {
printf("Cannot read sandbox state file '%s'\n", fname);
ret = -EIO;
goto err_read;
}
os_close(fd);
return 0;
err_read:
os_close(fd);
err_open:
os_free(state->state_fdt);
state->state_fdt = NULL;
return ret;
}
/***
* sandbox_read_state_nodes() - Read state associated with a driver
*
* This looks through all compatible nodes and calls the read function on
* each one, to read in the state.
*
* If nothing is found, it still calls the read function once, to set up a
* single global state for that driver.
*
* @state: Sandbox state
* @io: Method to use for reading state
* @blob: FDT containing state
* @return 0 if OK, -EINVAL if the read function returned failure
*/
int sandbox_read_state_nodes(struct sandbox_state *state,
struct sandbox_state_io *io, const void *blob)
{
int count;
int node;
int ret;
debug(" - read %s\n", io->name);
if (!io->read)
return 0;
node = -1;
count = 0;
while (blob) {
node = fdt_node_offset_by_compatible(blob, node, io->compat);
if (node < 0)
return 0; /* No more */
debug(" - read node '%s'\n", fdt_get_name(blob, node, NULL));
ret = io->read(blob, node);
if (ret) {
printf("Unable to read state for '%s'\n", io->compat);
return -EINVAL;
}
count++;
}
/*
* If we got no saved state, call the read function once without a
* node, to set up the global state.
*/
if (count == 0) {
debug(" - read global\n");
ret = io->read(NULL, -1);
if (ret) {
printf("Unable to read global state for '%s'\n",
io->name);
return -EINVAL;
}
}
return 0;
}
int sandbox_read_state(struct sandbox_state *state, const char *fname)
{
struct sandbox_state_io *io;
const void *blob;
bool got_err;
int ret;
if (state->read_state && fname) {
ret = state_read_file(state, fname);
if (ret == -ENOENT && state->ignore_missing_state_on_read)
ret = 0;
if (ret)
return ret;
}
/* Call all the state read functions */
got_err = false;
blob = state->state_fdt;
io = ll_entry_start(struct sandbox_state_io, state_io);
for (; io < ll_entry_end(struct sandbox_state_io, state_io); io++) {
ret = sandbox_read_state_nodes(state, io, blob);
if (ret < 0)
got_err = true;
}
if (state->read_state && fname) {
debug("Read sandbox state from '%s'%s\n", fname,
got_err ? " (with errors)" : "");
}
return got_err ? -1 : 0;
}
/***
* sandbox_write_state_node() - Write state associated with a driver
*
* This calls the write function to write out global state for that driver.
*
* TODO(sjg@chromium.org): Support writing out state from multiple drivers
* of the same time. We don't need this yet,and it will be much easier to
* do when driver model is available.
*
* @state: Sandbox state
* @io: Method to use for writing state
* @return 0 if OK, -EIO if there is a fatal error (such as out of space
* for adding the data), -EINVAL if the write function failed.
*/
int sandbox_write_state_node(struct sandbox_state *state,
struct sandbox_state_io *io)
{
void *blob;
int node;
int ret;
if (!io->write)
return 0;
ret = state_ensure_space(SANDBOX_STATE_MIN_SPACE);
if (ret) {
printf("Failed to add more space for state\n");
return -EIO;
}
/* The blob location can change when the size increases */
blob = state->state_fdt;
node = fdt_node_offset_by_compatible(blob, -1, io->compat);
if (node == -FDT_ERR_NOTFOUND) {
node = fdt_add_subnode(blob, 0, io->name);
if (node < 0) {
printf("Cannot create node '%s': %s\n", io->name,
fdt_strerror(node));
return -EIO;
}
if (fdt_setprop_string(blob, node, "compatible", io->compat)) {
puts("Cannot set compatible\n");
return -EIO;
}
} else if (node < 0) {
printf("Cannot access node '%s': %s\n", io->name,
fdt_strerror(node));
return -EIO;
}
debug("Write state for '%s' to node %d\n", io->compat, node);
ret = io->write(blob, node);
if (ret) {
printf("Unable to write state for '%s'\n", io->compat);
return -EINVAL;
}
return 0;
}
int sandbox_write_state(struct sandbox_state *state, const char *fname)
{
struct sandbox_state_io *io;
bool got_err;
int size;
int ret;
int fd;
/* Create a state FDT if we don't have one */
if (!state->state_fdt) {
size = 0x4000;
state->state_fdt = os_malloc(size);
if (!state->state_fdt) {
puts("No memory to create FDT\n");
return -ENOMEM;
}
ret = fdt_create_empty_tree(state->state_fdt, size);
if (ret < 0) {
printf("Cannot create empty state FDT: %s\n",
fdt_strerror(ret));
ret = -EIO;
goto err_create;
}
}
/* Call all the state write funtcions */
got_err = false;
io = ll_entry_start(struct sandbox_state_io, state_io);
ret = 0;
for (; io < ll_entry_end(struct sandbox_state_io, state_io); io++) {
ret = sandbox_write_state_node(state, io);
if (ret == -EIO)
break;
else if (ret)
got_err = true;
}
if (ret == -EIO) {
printf("Could not write sandbox state\n");
goto err_create;
}
ret = fdt_pack(state->state_fdt);
if (ret < 0) {
printf("Cannot pack state FDT: %s\n", fdt_strerror(ret));
ret = -EINVAL;
goto err_create;
}
size = fdt_totalsize(state->state_fdt);
fd = os_open(fname, OS_O_WRONLY | OS_O_CREAT);
if (fd < 0) {
printf("Cannot open sandbox state file '%s'\n", fname);
ret = -EIO;
goto err_create;
}
if (os_write(fd, state->state_fdt, size) != size) {
printf("Cannot write sandbox state file '%s'\n", fname);
ret = -EIO;
goto err_write;
}
os_close(fd);
debug("Wrote sandbox state to '%s'%s\n", fname,
got_err ? " (with errors)" : "");
return 0;
err_write:
os_close(fd);
err_create:
os_free(state->state_fdt);
return ret;
}
int state_setprop(int node, const char *prop_name, const void *data, int size)
{
void *blob;
int len;
int ret;
fdt_getprop(state->state_fdt, node, prop_name, &len);
/* Add space for the new property, its name and some overhead */
ret = state_ensure_space(size - len + strlen(prop_name) + 32);
if (ret)
return ret;
/* This should succeed, barring a mutiny */
blob = state->state_fdt;
ret = fdt_setprop(blob, node, prop_name, data, size);
if (ret) {
printf("%s: Unable to set property '%s' in node '%s': %s\n",
__func__, prop_name, fdt_get_name(blob, node, NULL),
fdt_strerror(ret));
return -ENOSPC;
}
return 0;
}
struct sandbox_state *state_get_current(void)
{
assert(state);
return state;
}
void state_set_skip_delays(bool skip_delays)
{
struct sandbox_state *state = state_get_current();
state->skip_delays = skip_delays;
}
bool state_get_skip_delays(void)
{
struct sandbox_state *state = state_get_current();
return state->skip_delays;
}
void state_reset_for_test(struct sandbox_state *state)
{
/* No reset yet, so mark it as such. Always allow power reset */
state->last_sysreset = SYSRESET_COUNT;
state->sysreset_allowed[SYSRESET_POWER] = true;
memset(&state->wdt, '\0', sizeof(state->wdt));
memset(state->spi, '\0', sizeof(state->spi));
/*
* Set up the memory tag list. Use the top of emulated SDRAM for the
* first tag number, since that address offset is outside the legal
* range, and can be assumed to be a tag.
*/
INIT_LIST_HEAD(&state->mapmem_head);
state->next_tag = state->ram_size;
}
int state_init(void)
{
state = &main_state;
state->ram_size = CONFIG_SYS_SDRAM_SIZE;
state->ram_buf = os_malloc(state->ram_size);
assert(state->ram_buf);
state_reset_for_test(state);
/*
* Example of how to use GPIOs:
*
* sandbox_gpio_set_direction(170, 0);
* sandbox_gpio_set_value(170, 0);
*/
return 0;
}
int state_uninit(void)
{
int err;
state = &main_state;
if (state->write_ram_buf && !state->ram_buf_rm) {
err = os_write_ram_buf(state->ram_buf_fname);
if (err) {
printf("Failed to write RAM buffer\n");
return err;
}
}
if (state->write_state) {
if (sandbox_write_state(state, state->state_fname)) {
printf("Failed to write sandbox state\n");
return -1;
}
}
/* Delete this at the last moment so as not to upset gdb too much */
if (state->jumped_fname)
os_unlink(state->jumped_fname);
if (state->state_fdt)
os_free(state->state_fdt);
memset(state, '\0', sizeof(*state));
return 0;
}