/* * (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, };