| /* |
| * (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, |
| }; |
