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https://github.com/AsahiLinux/u-boot
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185f812c41
Sphinx expects Return: and not @return to indicate a return value.
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Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
358 lines
8.6 KiB
C
358 lines
8.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2015
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* Texas Instruments Incorporated - http://www.ti.com/
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*/
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#define pr_fmt(fmt) "%s: " fmt, __func__
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <log.h>
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#include <remoteproc.h>
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#include <asm/io.h>
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/**
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* enum sandbox_state - different device states
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* @sb_booted: Entry condition, just booted
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* @sb_init: Initialized (basic environment is ready)
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* @sb_reset: Held in reset (accessible, but not running)
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* @sb_loaded: Loaded with image (but not running)
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* @sb_running: Processor is running
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*/
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enum sandbox_state {
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sb_booted,
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sb_init,
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sb_reset,
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sb_loaded,
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sb_running
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};
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/**
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* struct sandbox_test_devdata - private data per device
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* @current_state: device current state
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*/
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struct sandbox_test_devdata {
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enum sandbox_state current_state;
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};
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/**
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* sandbox_dev_move_to_state() - statemachine for our dummy device
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* @dev: device to switch state
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* @next_state: next proposed state
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*
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* This tries to follow the following statemachine:
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* Entry
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* |
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* v
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* +-------+
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* +---+ init |
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* | | | <---------------------+
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* | +-------+ |
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* | |
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* | |
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* | +--------+ |
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* Load| | reset | |
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* | | | <----------+ |
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* | +--------+ | |
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* | |Load | |
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* | | | |
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* | +----v----+ reset | |
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* +-> | | (opt) | |
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* | Loaded +-----------+ |
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* | | |
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* +----+----+ |
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* | Start |
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* +---v-----+ (opt) |
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* +->| Running | Stop |
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* Ping +- | +--------------------+
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* (opt) +---------+
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*
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* (is_running does not change state)
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*
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* Return: 0 when valid state transition is seen, else returns -EINVAL
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*/
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static int sandbox_dev_move_to_state(struct udevice *dev,
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enum sandbox_state next_state)
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{
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struct sandbox_test_devdata *ddata = dev_get_priv(dev);
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/* No state transition is OK */
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if (ddata->current_state == next_state)
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return 0;
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debug("current_state=%d, next_state=%d\n", ddata->current_state,
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next_state);
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switch (ddata->current_state) {
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case sb_booted:
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if (next_state == sb_init)
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goto ok_state;
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break;
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case sb_init:
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if (next_state == sb_reset || next_state == sb_loaded)
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goto ok_state;
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break;
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case sb_reset:
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if (next_state == sb_loaded || next_state == sb_init)
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goto ok_state;
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break;
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case sb_loaded:
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if (next_state == sb_reset || next_state == sb_init ||
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next_state == sb_running)
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goto ok_state;
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break;
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case sb_running:
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if (next_state == sb_reset || next_state == sb_init)
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goto ok_state;
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break;
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};
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return -EINVAL;
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ok_state:
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ddata->current_state = next_state;
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return 0;
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}
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/**
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* sandbox_testproc_probe() - basic probe function
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* @dev: test proc device that is being probed.
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*
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* Return: 0 if all went ok, else return appropriate error
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*/
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static int sandbox_testproc_probe(struct udevice *dev)
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{
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struct dm_rproc_uclass_pdata *uc_pdata;
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struct sandbox_test_devdata *ddata;
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int ret;
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uc_pdata = dev_get_uclass_plat(dev);
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ddata = dev_get_priv(dev);
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if (!ddata) {
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debug("%s: platform private data missing\n", uc_pdata->name);
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return -EINVAL;
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}
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ret = sandbox_dev_move_to_state(dev, sb_booted);
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debug("%s: called(%d)\n", uc_pdata->name, ret);
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return ret;
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}
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/**
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* sandbox_testproc_init() - Simple initialization function
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* @dev: device to operate upon
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*
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* Return: 0 if all went ok, else return appropriate error
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*/
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static int sandbox_testproc_init(struct udevice *dev)
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{
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struct dm_rproc_uclass_pdata *uc_pdata;
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int ret;
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uc_pdata = dev_get_uclass_plat(dev);
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ret = sandbox_dev_move_to_state(dev, sb_init);
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debug("%s: called(%d)\n", uc_pdata->name, ret);
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if (ret)
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debug("%s init failed\n", uc_pdata->name);
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return ret;
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}
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/**
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* sandbox_testproc_reset() - Reset the remote processor
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* @dev: device to operate upon
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*
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* Return: 0 if all went ok, else return appropriate error
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*/
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static int sandbox_testproc_reset(struct udevice *dev)
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{
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struct dm_rproc_uclass_pdata *uc_pdata;
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int ret;
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uc_pdata = dev_get_uclass_plat(dev);
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ret = sandbox_dev_move_to_state(dev, sb_reset);
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debug("%s: called(%d)\n", uc_pdata->name, ret);
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if (ret)
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debug("%s reset failed\n", uc_pdata->name);
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return ret;
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}
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/**
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* sandbox_testproc_load() - (replace: short desc)
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* @dev: device to operate upon
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* @addr: Address of the binary image to load
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* @size: Size (in bytes) of the binary image to load
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*
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* Return: 0 if all went ok, else return appropriate error
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*/
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static int sandbox_testproc_load(struct udevice *dev, ulong addr, ulong size)
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{
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struct dm_rproc_uclass_pdata *uc_pdata;
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int ret;
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uc_pdata = dev_get_uclass_plat(dev);
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ret = sandbox_dev_move_to_state(dev, sb_loaded);
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debug("%s: called(%d) Loading to %08lX %lu size\n",
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uc_pdata->name, ret, addr, size);
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if (ret)
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debug("%s load failed\n", uc_pdata->name);
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return ret;
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}
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/**
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* sandbox_testproc_start() - Start the remote processor
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* @dev: device to operate upon
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*
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* Return: 0 if all went ok, else return appropriate error
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*/
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static int sandbox_testproc_start(struct udevice *dev)
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{
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struct dm_rproc_uclass_pdata *uc_pdata;
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int ret;
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uc_pdata = dev_get_uclass_plat(dev);
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ret = sandbox_dev_move_to_state(dev, sb_running);
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debug("%s: called(%d)\n", uc_pdata->name, ret);
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if (ret)
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debug("%s start failed\n", uc_pdata->name);
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return ret;
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}
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/**
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* sandbox_testproc_stop() - Stop the remote processor
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* @dev: device to operate upon
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*
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* Return: 0 if all went ok, else return appropriate error
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*/
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static int sandbox_testproc_stop(struct udevice *dev)
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{
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struct dm_rproc_uclass_pdata *uc_pdata;
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int ret;
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uc_pdata = dev_get_uclass_plat(dev);
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ret = sandbox_dev_move_to_state(dev, sb_init);
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debug("%s: called(%d)\n", uc_pdata->name, ret);
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if (ret)
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debug("%s stop failed\n", uc_pdata->name);
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return ret;
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}
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/**
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* sandbox_testproc_is_running() - Check if remote processor is running
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* @dev: device to operate upon
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*
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* Return: 0 if running, 1 if not running
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*/
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static int sandbox_testproc_is_running(struct udevice *dev)
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{
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struct dm_rproc_uclass_pdata *uc_pdata;
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struct sandbox_test_devdata *ddata;
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int ret = 1;
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uc_pdata = dev_get_uclass_plat(dev);
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ddata = dev_get_priv(dev);
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if (ddata->current_state == sb_running)
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ret = 0;
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debug("%s: called(%d)\n", uc_pdata->name, ret);
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return ret;
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}
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/**
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* sandbox_testproc_ping() - Try pinging remote processor
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* @dev: device to operate upon
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*
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* Return: 0 if running, -EINVAL if not running
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*/
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static int sandbox_testproc_ping(struct udevice *dev)
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{
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struct dm_rproc_uclass_pdata *uc_pdata;
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struct sandbox_test_devdata *ddata;
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int ret;
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uc_pdata = dev_get_uclass_plat(dev);
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ddata = dev_get_priv(dev);
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if (ddata->current_state == sb_running)
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ret = 0;
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else
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ret = -EINVAL;
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debug("%s: called(%d)\n", uc_pdata->name, ret);
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if (ret)
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debug("%s: No response.(Not started?)\n", uc_pdata->name);
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return ret;
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}
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#define SANDBOX_RPROC_DEV_TO_PHY_OFFSET 0x1000
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/**
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* sandbox_testproc_device_to_virt() - Convert device address to virtual address
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* @dev: device to operate upon
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* @da: device address
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* @size: Size of the memory region @da is pointing to
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* Return: converted virtual address
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*/
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static void *sandbox_testproc_device_to_virt(struct udevice *dev, ulong da,
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ulong size)
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{
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u64 paddr;
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/* Use a simple offset conversion */
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paddr = da + SANDBOX_RPROC_DEV_TO_PHY_OFFSET;
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return phys_to_virt(paddr);
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}
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static const struct dm_rproc_ops sandbox_testproc_ops = {
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.init = sandbox_testproc_init,
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.reset = sandbox_testproc_reset,
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.load = sandbox_testproc_load,
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.start = sandbox_testproc_start,
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.stop = sandbox_testproc_stop,
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.is_running = sandbox_testproc_is_running,
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.ping = sandbox_testproc_ping,
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.device_to_virt = sandbox_testproc_device_to_virt,
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};
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static const struct udevice_id sandbox_ids[] = {
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{.compatible = "sandbox,test-processor"},
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{}
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};
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U_BOOT_DRIVER(sandbox_testproc) = {
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.name = "sandbox_test_proc",
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.of_match = sandbox_ids,
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.id = UCLASS_REMOTEPROC,
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.ops = &sandbox_testproc_ops,
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.probe = sandbox_testproc_probe,
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.priv_auto = sizeof(struct sandbox_test_devdata),
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};
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/* TODO(nm@ti.com): Remove this along with non-DT support */
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static struct dm_rproc_uclass_pdata proc_3_test = {
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.name = "proc_3_legacy",
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.mem_type = RPROC_INTERNAL_MEMORY_MAPPED,
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};
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U_BOOT_DRVINFO(proc_3_demo) = {
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.name = "sandbox_test_proc",
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.plat = &proc_3_test,
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};
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