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11795e02c1
The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Signed-off-by: Rob Herring <robh@kernel.org> Signed-off-by: Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/r/20230714175139.4067685-1-robh@kernel.org [claudiu.beznea: added link] Signed-off-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>
217 lines
5.7 KiB
C
217 lines
5.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Microchip PolarFire SoC (MPFS) system controller driver
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*
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* Copyright (c) 2020-2021 Microchip Corporation. All rights reserved.
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*
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* Author: Conor Dooley <conor.dooley@microchip.com>
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*
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*/
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#include <linux/slab.h>
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#include <linux/kref.h>
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#include <linux/module.h>
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#include <linux/jiffies.h>
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#include <linux/interrupt.h>
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#include <linux/of.h>
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#include <linux/mailbox_client.h>
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#include <linux/platform_device.h>
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#include <soc/microchip/mpfs.h>
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/*
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* This timeout must be long, as some services (example: image authentication)
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* take significant time to complete
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*/
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#define MPFS_SYS_CTRL_TIMEOUT_MS 30000
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static DEFINE_MUTEX(transaction_lock);
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struct mpfs_sys_controller {
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struct mbox_client client;
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struct mbox_chan *chan;
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struct completion c;
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struct kref consumers;
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};
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int mpfs_blocking_transaction(struct mpfs_sys_controller *sys_controller, struct mpfs_mss_msg *msg)
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{
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unsigned long timeout = msecs_to_jiffies(MPFS_SYS_CTRL_TIMEOUT_MS);
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int ret;
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ret = mutex_lock_interruptible(&transaction_lock);
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if (ret)
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return ret;
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reinit_completion(&sys_controller->c);
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ret = mbox_send_message(sys_controller->chan, msg);
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if (ret < 0) {
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dev_warn(sys_controller->client.dev, "MPFS sys controller service timeout\n");
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goto out;
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}
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/*
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* Unfortunately, the system controller will only deliver an interrupt
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* if a service succeeds. mbox_send_message() will block until the busy
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* flag is gone. If the busy flag is gone but no interrupt has arrived
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* to trigger the rx callback then the service can be deemed to have
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* failed.
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* The caller can then interrogate msg::response::resp_status to
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* determine the cause of the failure.
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* mbox_send_message() returns positive integers in the success path, so
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* ret needs to be cleared if we do get an interrupt.
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*/
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if (!wait_for_completion_timeout(&sys_controller->c, timeout)) {
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ret = -EBADMSG;
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dev_warn(sys_controller->client.dev, "MPFS sys controller service failed\n");
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} else {
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ret = 0;
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}
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out:
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mutex_unlock(&transaction_lock);
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return ret;
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}
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EXPORT_SYMBOL(mpfs_blocking_transaction);
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static void mpfs_sys_controller_rx_callback(struct mbox_client *client, void *msg)
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{
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struct mpfs_sys_controller *sys_controller =
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container_of(client, struct mpfs_sys_controller, client);
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complete(&sys_controller->c);
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}
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static void mpfs_sys_controller_delete(struct kref *kref)
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{
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struct mpfs_sys_controller *sys_controller =
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container_of(kref, struct mpfs_sys_controller, consumers);
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mbox_free_channel(sys_controller->chan);
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kfree(sys_controller);
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}
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static void mpfs_sys_controller_put(void *data)
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{
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struct mpfs_sys_controller *sys_controller = data;
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kref_put(&sys_controller->consumers, mpfs_sys_controller_delete);
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}
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static struct platform_device subdevs[] = {
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{
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.name = "mpfs-rng",
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.id = -1,
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},
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{
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.name = "mpfs-generic-service",
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.id = -1,
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}
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};
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static int mpfs_sys_controller_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct mpfs_sys_controller *sys_controller;
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int i, ret;
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sys_controller = kzalloc(sizeof(*sys_controller), GFP_KERNEL);
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if (!sys_controller)
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return -ENOMEM;
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sys_controller->client.dev = dev;
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sys_controller->client.rx_callback = mpfs_sys_controller_rx_callback;
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sys_controller->client.tx_block = 1U;
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sys_controller->client.tx_tout = msecs_to_jiffies(MPFS_SYS_CTRL_TIMEOUT_MS);
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sys_controller->chan = mbox_request_channel(&sys_controller->client, 0);
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if (IS_ERR(sys_controller->chan)) {
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ret = dev_err_probe(dev, PTR_ERR(sys_controller->chan),
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"Failed to get mbox channel\n");
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kfree(sys_controller);
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return ret;
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}
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init_completion(&sys_controller->c);
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kref_init(&sys_controller->consumers);
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platform_set_drvdata(pdev, sys_controller);
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dev_info(&pdev->dev, "Registered MPFS system controller\n");
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for (i = 0; i < ARRAY_SIZE(subdevs); i++) {
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subdevs[i].dev.parent = dev;
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if (platform_device_register(&subdevs[i]))
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dev_warn(dev, "Error registering sub device %s\n", subdevs[i].name);
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}
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return 0;
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}
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static int mpfs_sys_controller_remove(struct platform_device *pdev)
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{
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struct mpfs_sys_controller *sys_controller = platform_get_drvdata(pdev);
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mpfs_sys_controller_put(sys_controller);
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return 0;
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}
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static const struct of_device_id mpfs_sys_controller_of_match[] = {
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{.compatible = "microchip,mpfs-sys-controller", },
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{},
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};
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MODULE_DEVICE_TABLE(of, mpfs_sys_controller_of_match);
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struct mpfs_sys_controller *mpfs_sys_controller_get(struct device *dev)
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{
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const struct of_device_id *match;
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struct mpfs_sys_controller *sys_controller;
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int ret;
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if (!dev->parent)
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goto err_no_device;
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match = of_match_node(mpfs_sys_controller_of_match, dev->parent->of_node);
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of_node_put(dev->parent->of_node);
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if (!match)
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goto err_no_device;
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sys_controller = dev_get_drvdata(dev->parent);
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if (!sys_controller)
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goto err_bad_device;
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if (!kref_get_unless_zero(&sys_controller->consumers))
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goto err_bad_device;
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ret = devm_add_action_or_reset(dev, mpfs_sys_controller_put, sys_controller);
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if (ret)
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return ERR_PTR(ret);
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return sys_controller;
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err_no_device:
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dev_dbg(dev, "Parent device was not an MPFS system controller\n");
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return ERR_PTR(-ENODEV);
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err_bad_device:
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dev_dbg(dev, "MPFS system controller found but could not register as a sub device\n");
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return ERR_PTR(-EPROBE_DEFER);
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}
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EXPORT_SYMBOL(mpfs_sys_controller_get);
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static struct platform_driver mpfs_sys_controller_driver = {
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.driver = {
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.name = "mpfs-sys-controller",
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.of_match_table = mpfs_sys_controller_of_match,
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},
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.probe = mpfs_sys_controller_probe,
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.remove = mpfs_sys_controller_remove,
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};
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module_platform_driver(mpfs_sys_controller_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Conor Dooley <conor.dooley@microchip.com>");
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MODULE_DESCRIPTION("MPFS system controller driver");
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