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/*
* (C) Copyright 2015
* Texas Instruments Incorporated - http://www.ti.com/
* SPDX-License-Identifier: GPL-2.0+
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <remoteproc.h>
/**
* enum sandbox_state - different device states
* @sb_booted: Entry condition, just booted
* @sb_init: Initialized (basic environment is ready)
* @sb_reset: Held in reset (accessible, but not running)
* @sb_loaded: Loaded with image (but not running)
* @sb_running: Processor is running
*/
enum sandbox_state {
sb_booted,
sb_init,
sb_reset,
sb_loaded,
sb_running
};
/**
* struct sandbox_test_devdata - private data per device
* @current_state: device current state
*/
struct sandbox_test_devdata {
enum sandbox_state current_state;
};
/**
* sandbox_dev_move_to_state() - statemachine for our dummy device
* @dev: device to switch state
* @next_state: next proposed state
*
* This tries to follow the following statemachine:
* Entry
* |
* v
* +-------+
* +---+ init |
* | | | <---------------------+
* | +-------+ |
* | |
* | |
* | +--------+ |
* Load| | reset | |
* | | | <----------+ |
* | +--------+ | |
* | |Load | |
* | | | |
* | +----v----+ reset | |
* +-> | | (opt) | |
* | Loaded +-----------+ |
* | | |
* +----+----+ |
* | Start |
* +---v-----+ (opt) |
* +->| Running | Stop |
* Ping +- | +--------------------+
* (opt) +---------+
*
* (is_running does not change state)
*
* Return: 0 when valid state transition is seen, else returns -EINVAL
*/
static int sandbox_dev_move_to_state(struct udevice *dev,
enum sandbox_state next_state)
{
struct sandbox_test_devdata *ddata = dev_get_priv(dev);
/* No state transition is OK */
if (ddata->current_state == next_state)
return 0;
debug("current_state=%d, next_state=%d\n", ddata->current_state,
next_state);
switch (ddata->current_state) {
case sb_booted:
if (next_state == sb_init)
goto ok_state;
break;
case sb_init:
if (next_state == sb_reset || next_state == sb_loaded)
goto ok_state;
break;
case sb_reset:
if (next_state == sb_loaded || next_state == sb_init)
goto ok_state;
break;
case sb_loaded:
if (next_state == sb_reset || next_state == sb_init ||
next_state == sb_running)
goto ok_state;
break;
case sb_running:
if (next_state == sb_reset || next_state == sb_init)
goto ok_state;
break;
};
return -EINVAL;
ok_state:
ddata->current_state = next_state;
return 0;
}
/**
* sandbox_testproc_probe() - basic probe function
* @dev: test proc device that is being probed.
*
* Return: 0 if all went ok, else return appropriate error
*/
static int sandbox_testproc_probe(struct udevice *dev)
{
struct dm_rproc_uclass_pdata *uc_pdata;
struct sandbox_test_devdata *ddata;
int ret;
uc_pdata = dev_get_uclass_platdata(dev);
ddata = dev_get_priv(dev);
if (!ddata) {
debug("%s: platform private data missing\n", uc_pdata->name);
return -EINVAL;
}
ret = sandbox_dev_move_to_state(dev, sb_booted);
debug("%s: called(%d)\n", uc_pdata->name, ret);
return ret;
}
/**
* sandbox_testproc_init() - Simple initialization function
* @dev: device to operate upon
*
* Return: 0 if all went ok, else return appropriate error
*/
static int sandbox_testproc_init(struct udevice *dev)
{
struct dm_rproc_uclass_pdata *uc_pdata;
int ret;
uc_pdata = dev_get_uclass_platdata(dev);
ret = sandbox_dev_move_to_state(dev, sb_init);
debug("%s: called(%d)\n", uc_pdata->name, ret);
if (ret)
debug("%s init failed\n", uc_pdata->name);
return ret;
}
/**
* sandbox_testproc_reset() - Reset the remote processor
* @dev: device to operate upon
*
* Return: 0 if all went ok, else return appropriate error
*/
static int sandbox_testproc_reset(struct udevice *dev)
{
struct dm_rproc_uclass_pdata *uc_pdata;
int ret;
uc_pdata = dev_get_uclass_platdata(dev);
ret = sandbox_dev_move_to_state(dev, sb_reset);
debug("%s: called(%d)\n", uc_pdata->name, ret);
if (ret)
debug("%s reset failed\n", uc_pdata->name);
return ret;
}
/**
* sandbox_testproc_load() - (replace: short desc)
* @dev: device to operate upon
* @addr: Address of the binary image to load
* @size: Size (in bytes) of the binary image to load
*
* Return: 0 if all went ok, else return appropriate error
*/
static int sandbox_testproc_load(struct udevice *dev, ulong addr, ulong size)
{
struct dm_rproc_uclass_pdata *uc_pdata;
int ret;
uc_pdata = dev_get_uclass_platdata(dev);
ret = sandbox_dev_move_to_state(dev, sb_loaded);
debug("%s: called(%d) Loading to %08lX %lu size\n",
uc_pdata->name, ret, addr, size);
if (ret)
debug("%s load failed\n", uc_pdata->name);
return ret;
}
/**
* sandbox_testproc_start() - Start the remote processor
* @dev: device to operate upon
*
* Return: 0 if all went ok, else return appropriate error
*/
static int sandbox_testproc_start(struct udevice *dev)
{
struct dm_rproc_uclass_pdata *uc_pdata;
int ret;
uc_pdata = dev_get_uclass_platdata(dev);
ret = sandbox_dev_move_to_state(dev, sb_running);
debug("%s: called(%d)\n", uc_pdata->name, ret);
if (ret)
debug("%s start failed\n", uc_pdata->name);
return ret;
}
/**
* sandbox_testproc_stop() - Stop the remote processor
* @dev: device to operate upon
*
* Return: 0 if all went ok, else return appropriate error
*/
static int sandbox_testproc_stop(struct udevice *dev)
{
struct dm_rproc_uclass_pdata *uc_pdata;
int ret;
uc_pdata = dev_get_uclass_platdata(dev);
ret = sandbox_dev_move_to_state(dev, sb_init);
debug("%s: called(%d)\n", uc_pdata->name, ret);
if (ret)
debug("%s stop failed\n", uc_pdata->name);
return ret;
}
/**
* sandbox_testproc_is_running() - Check if remote processor is running
* @dev: device to operate upon
*
* Return: 0 if running, 1 if not running
*/
static int sandbox_testproc_is_running(struct udevice *dev)
{
struct dm_rproc_uclass_pdata *uc_pdata;
struct sandbox_test_devdata *ddata;
int ret = 1;
uc_pdata = dev_get_uclass_platdata(dev);
ddata = dev_get_priv(dev);
if (ddata->current_state == sb_running)
ret = 0;
debug("%s: called(%d)\n", uc_pdata->name, ret);
return ret;
}
/**
* sandbox_testproc_ping() - Try pinging remote processor
* @dev: device to operate upon
*
* Return: 0 if running, -EINVAL if not running
*/
static int sandbox_testproc_ping(struct udevice *dev)
{
struct dm_rproc_uclass_pdata *uc_pdata;
struct sandbox_test_devdata *ddata;
int ret;
uc_pdata = dev_get_uclass_platdata(dev);
ddata = dev_get_priv(dev);
if (ddata->current_state == sb_running)
ret = 0;
else
ret = -EINVAL;
debug("%s: called(%d)\n", uc_pdata->name, ret);
if (ret)
debug("%s: No response.(Not started?)\n", uc_pdata->name);
return ret;
}
static const struct dm_rproc_ops sandbox_testproc_ops = {
.init = sandbox_testproc_init,
.reset = sandbox_testproc_reset,
.load = sandbox_testproc_load,
.start = sandbox_testproc_start,
.stop = sandbox_testproc_stop,
.is_running = sandbox_testproc_is_running,
.ping = sandbox_testproc_ping,
};
static const struct udevice_id sandbox_ids[] = {
{.compatible = "sandbox,test-processor"},
{}
};
U_BOOT_DRIVER(sandbox_testproc) = {
.name = "sandbox_test_proc",
.of_match = sandbox_ids,
.id = UCLASS_REMOTEPROC,
.ops = &sandbox_testproc_ops,
.probe = sandbox_testproc_probe,
.priv_auto_alloc_size = sizeof(struct sandbox_test_devdata),
};
/* TODO(nm@ti.com): Remove this along with non-DT support */
static struct dm_rproc_uclass_pdata proc_3_test = {
.name = "proc_3_legacy",
.mem_type = RPROC_INTERNAL_MEMORY_MAPPED,
};
U_BOOT_DEVICE(proc_3_demo) = {
.name = "sandbox_test_proc",
.platdata = &proc_3_test,
};
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