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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
![Sean Wang](/assets/img/avatar_default.png)
In order to open up the required power gate before any operation can be effectively performed over the serial bus between CPU and serdev, it's clearly essential to add common attach functions for PM domains to serdev at the probe phase. Similarly, the relevant dettach function for the PM domains should be properly and reversely added at the remove phase. Signed-off-by: Sean Wang <sean.wang@mediatek.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Johan Hovold <johan@kernel.org> Cc: Rob Herring <robh@kernel.org> Cc: Ulf Hansson <ulf.hansson@linaro.org> Cc: Jiri Slaby <jslaby@suse.com> Cc: linux-serial@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
680 lines
16 KiB
C
680 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2016-2017 Linaro Ltd., Rob Herring <robh@kernel.org>
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*
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* Based on drivers/spmi/spmi.c:
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* Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.
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*/
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#include <linux/acpi.h>
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#include <linux/errno.h>
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#include <linux/idr.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/pm_domain.h>
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#include <linux/pm_runtime.h>
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#include <linux/serdev.h>
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#include <linux/slab.h>
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static bool is_registered;
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static DEFINE_IDA(ctrl_ida);
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static ssize_t modalias_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int len;
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len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1);
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if (len != -ENODEV)
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return len;
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return of_device_modalias(dev, buf, PAGE_SIZE);
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}
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static DEVICE_ATTR_RO(modalias);
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static struct attribute *serdev_device_attrs[] = {
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&dev_attr_modalias.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(serdev_device);
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static int serdev_device_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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int rc;
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/* TODO: platform modalias */
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rc = acpi_device_uevent_modalias(dev, env);
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if (rc != -ENODEV)
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return rc;
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return of_device_uevent_modalias(dev, env);
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}
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static void serdev_device_release(struct device *dev)
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{
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struct serdev_device *serdev = to_serdev_device(dev);
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kfree(serdev);
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}
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static const struct device_type serdev_device_type = {
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.groups = serdev_device_groups,
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.uevent = serdev_device_uevent,
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.release = serdev_device_release,
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};
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static bool is_serdev_device(const struct device *dev)
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{
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return dev->type == &serdev_device_type;
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}
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static void serdev_ctrl_release(struct device *dev)
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{
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struct serdev_controller *ctrl = to_serdev_controller(dev);
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ida_simple_remove(&ctrl_ida, ctrl->nr);
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kfree(ctrl);
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}
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static const struct device_type serdev_ctrl_type = {
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.release = serdev_ctrl_release,
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};
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static int serdev_device_match(struct device *dev, struct device_driver *drv)
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{
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if (!is_serdev_device(dev))
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return 0;
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/* TODO: platform matching */
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if (acpi_driver_match_device(dev, drv))
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return 1;
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return of_driver_match_device(dev, drv);
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}
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/**
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* serdev_device_add() - add a device previously constructed via serdev_device_alloc()
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* @serdev: serdev_device to be added
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*/
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int serdev_device_add(struct serdev_device *serdev)
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{
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struct serdev_controller *ctrl = serdev->ctrl;
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struct device *parent = serdev->dev.parent;
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int err;
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dev_set_name(&serdev->dev, "%s-%d", dev_name(parent), serdev->nr);
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/* Only a single slave device is currently supported. */
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if (ctrl->serdev) {
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dev_err(&serdev->dev, "controller busy\n");
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return -EBUSY;
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}
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ctrl->serdev = serdev;
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err = device_add(&serdev->dev);
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if (err < 0) {
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dev_err(&serdev->dev, "Can't add %s, status %d\n",
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dev_name(&serdev->dev), err);
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goto err_clear_serdev;
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}
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dev_dbg(&serdev->dev, "device %s registered\n", dev_name(&serdev->dev));
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return 0;
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err_clear_serdev:
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ctrl->serdev = NULL;
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return err;
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}
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EXPORT_SYMBOL_GPL(serdev_device_add);
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/**
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* serdev_device_remove(): remove an serdev device
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* @serdev: serdev_device to be removed
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*/
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void serdev_device_remove(struct serdev_device *serdev)
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{
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struct serdev_controller *ctrl = serdev->ctrl;
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device_unregister(&serdev->dev);
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ctrl->serdev = NULL;
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}
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EXPORT_SYMBOL_GPL(serdev_device_remove);
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int serdev_device_open(struct serdev_device *serdev)
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{
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struct serdev_controller *ctrl = serdev->ctrl;
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int ret;
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if (!ctrl || !ctrl->ops->open)
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return -EINVAL;
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ret = ctrl->ops->open(ctrl);
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if (ret)
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return ret;
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ret = pm_runtime_get_sync(&ctrl->dev);
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if (ret < 0) {
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pm_runtime_put_noidle(&ctrl->dev);
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goto err_close;
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}
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return 0;
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err_close:
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if (ctrl->ops->close)
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ctrl->ops->close(ctrl);
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return ret;
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}
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EXPORT_SYMBOL_GPL(serdev_device_open);
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void serdev_device_close(struct serdev_device *serdev)
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{
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struct serdev_controller *ctrl = serdev->ctrl;
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if (!ctrl || !ctrl->ops->close)
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return;
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pm_runtime_put(&ctrl->dev);
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ctrl->ops->close(ctrl);
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}
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EXPORT_SYMBOL_GPL(serdev_device_close);
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static void devm_serdev_device_release(struct device *dev, void *dr)
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{
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serdev_device_close(*(struct serdev_device **)dr);
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}
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int devm_serdev_device_open(struct device *dev, struct serdev_device *serdev)
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{
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struct serdev_device **dr;
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int ret;
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dr = devres_alloc(devm_serdev_device_release, sizeof(*dr), GFP_KERNEL);
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if (!dr)
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return -ENOMEM;
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ret = serdev_device_open(serdev);
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if (ret) {
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devres_free(dr);
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return ret;
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}
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*dr = serdev;
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devres_add(dev, dr);
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return 0;
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}
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EXPORT_SYMBOL_GPL(devm_serdev_device_open);
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void serdev_device_write_wakeup(struct serdev_device *serdev)
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{
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complete(&serdev->write_comp);
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}
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EXPORT_SYMBOL_GPL(serdev_device_write_wakeup);
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int serdev_device_write_buf(struct serdev_device *serdev,
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const unsigned char *buf, size_t count)
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{
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struct serdev_controller *ctrl = serdev->ctrl;
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if (!ctrl || !ctrl->ops->write_buf)
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return -EINVAL;
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return ctrl->ops->write_buf(ctrl, buf, count);
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}
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EXPORT_SYMBOL_GPL(serdev_device_write_buf);
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int serdev_device_write(struct serdev_device *serdev,
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const unsigned char *buf, size_t count,
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unsigned long timeout)
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{
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struct serdev_controller *ctrl = serdev->ctrl;
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int ret;
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if (!ctrl || !ctrl->ops->write_buf ||
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(timeout && !serdev->ops->write_wakeup))
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return -EINVAL;
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mutex_lock(&serdev->write_lock);
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do {
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reinit_completion(&serdev->write_comp);
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ret = ctrl->ops->write_buf(ctrl, buf, count);
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if (ret < 0)
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break;
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buf += ret;
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count -= ret;
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} while (count &&
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(timeout = wait_for_completion_timeout(&serdev->write_comp,
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timeout)));
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mutex_unlock(&serdev->write_lock);
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return ret < 0 ? ret : (count ? -ETIMEDOUT : 0);
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}
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EXPORT_SYMBOL_GPL(serdev_device_write);
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void serdev_device_write_flush(struct serdev_device *serdev)
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{
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struct serdev_controller *ctrl = serdev->ctrl;
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if (!ctrl || !ctrl->ops->write_flush)
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return;
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ctrl->ops->write_flush(ctrl);
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}
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EXPORT_SYMBOL_GPL(serdev_device_write_flush);
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int serdev_device_write_room(struct serdev_device *serdev)
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{
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struct serdev_controller *ctrl = serdev->ctrl;
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if (!ctrl || !ctrl->ops->write_room)
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return 0;
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return serdev->ctrl->ops->write_room(ctrl);
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}
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EXPORT_SYMBOL_GPL(serdev_device_write_room);
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unsigned int serdev_device_set_baudrate(struct serdev_device *serdev, unsigned int speed)
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{
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struct serdev_controller *ctrl = serdev->ctrl;
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if (!ctrl || !ctrl->ops->set_baudrate)
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return 0;
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return ctrl->ops->set_baudrate(ctrl, speed);
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}
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EXPORT_SYMBOL_GPL(serdev_device_set_baudrate);
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void serdev_device_set_flow_control(struct serdev_device *serdev, bool enable)
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{
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struct serdev_controller *ctrl = serdev->ctrl;
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if (!ctrl || !ctrl->ops->set_flow_control)
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return;
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ctrl->ops->set_flow_control(ctrl, enable);
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}
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EXPORT_SYMBOL_GPL(serdev_device_set_flow_control);
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int serdev_device_set_parity(struct serdev_device *serdev,
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enum serdev_parity parity)
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{
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struct serdev_controller *ctrl = serdev->ctrl;
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if (!ctrl || !ctrl->ops->set_parity)
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return -ENOTSUPP;
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return ctrl->ops->set_parity(ctrl, parity);
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}
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EXPORT_SYMBOL_GPL(serdev_device_set_parity);
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void serdev_device_wait_until_sent(struct serdev_device *serdev, long timeout)
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{
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struct serdev_controller *ctrl = serdev->ctrl;
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if (!ctrl || !ctrl->ops->wait_until_sent)
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return;
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ctrl->ops->wait_until_sent(ctrl, timeout);
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}
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EXPORT_SYMBOL_GPL(serdev_device_wait_until_sent);
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int serdev_device_get_tiocm(struct serdev_device *serdev)
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{
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struct serdev_controller *ctrl = serdev->ctrl;
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if (!ctrl || !ctrl->ops->get_tiocm)
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return -ENOTSUPP;
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return ctrl->ops->get_tiocm(ctrl);
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}
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EXPORT_SYMBOL_GPL(serdev_device_get_tiocm);
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int serdev_device_set_tiocm(struct serdev_device *serdev, int set, int clear)
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{
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struct serdev_controller *ctrl = serdev->ctrl;
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if (!ctrl || !ctrl->ops->set_tiocm)
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return -ENOTSUPP;
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return ctrl->ops->set_tiocm(ctrl, set, clear);
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}
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EXPORT_SYMBOL_GPL(serdev_device_set_tiocm);
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static int serdev_drv_probe(struct device *dev)
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{
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const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
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int ret;
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ret = dev_pm_domain_attach(dev, true);
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if (ret)
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return ret;
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ret = sdrv->probe(to_serdev_device(dev));
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if (ret)
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dev_pm_domain_detach(dev, true);
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return ret;
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}
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static int serdev_drv_remove(struct device *dev)
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{
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const struct serdev_device_driver *sdrv = to_serdev_device_driver(dev->driver);
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if (sdrv->remove)
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sdrv->remove(to_serdev_device(dev));
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dev_pm_domain_detach(dev, true);
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return 0;
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}
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static struct bus_type serdev_bus_type = {
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.name = "serial",
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.match = serdev_device_match,
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.probe = serdev_drv_probe,
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.remove = serdev_drv_remove,
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};
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/**
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* serdev_device_alloc() - Allocate a new serdev device
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* @ctrl: associated controller
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*
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* Caller is responsible for either calling serdev_device_add() to add the
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* newly allocated controller, or calling serdev_device_put() to discard it.
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*/
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struct serdev_device *serdev_device_alloc(struct serdev_controller *ctrl)
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{
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struct serdev_device *serdev;
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serdev = kzalloc(sizeof(*serdev), GFP_KERNEL);
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if (!serdev)
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return NULL;
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serdev->ctrl = ctrl;
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device_initialize(&serdev->dev);
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serdev->dev.parent = &ctrl->dev;
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serdev->dev.bus = &serdev_bus_type;
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serdev->dev.type = &serdev_device_type;
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init_completion(&serdev->write_comp);
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mutex_init(&serdev->write_lock);
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return serdev;
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}
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EXPORT_SYMBOL_GPL(serdev_device_alloc);
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/**
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* serdev_controller_alloc() - Allocate a new serdev controller
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* @parent: parent device
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* @size: size of private data
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*
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* Caller is responsible for either calling serdev_controller_add() to add the
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* newly allocated controller, or calling serdev_controller_put() to discard it.
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* The allocated private data region may be accessed via
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* serdev_controller_get_drvdata()
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*/
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struct serdev_controller *serdev_controller_alloc(struct device *parent,
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size_t size)
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{
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struct serdev_controller *ctrl;
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int id;
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if (WARN_ON(!parent))
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return NULL;
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ctrl = kzalloc(sizeof(*ctrl) + size, GFP_KERNEL);
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if (!ctrl)
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return NULL;
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id = ida_simple_get(&ctrl_ida, 0, 0, GFP_KERNEL);
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if (id < 0) {
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dev_err(parent,
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"unable to allocate serdev controller identifier.\n");
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goto err_free;
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}
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ctrl->nr = id;
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device_initialize(&ctrl->dev);
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ctrl->dev.type = &serdev_ctrl_type;
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ctrl->dev.bus = &serdev_bus_type;
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ctrl->dev.parent = parent;
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ctrl->dev.of_node = parent->of_node;
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serdev_controller_set_drvdata(ctrl, &ctrl[1]);
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dev_set_name(&ctrl->dev, "serial%d", id);
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pm_runtime_no_callbacks(&ctrl->dev);
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pm_suspend_ignore_children(&ctrl->dev, true);
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dev_dbg(&ctrl->dev, "allocated controller 0x%p id %d\n", ctrl, id);
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return ctrl;
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err_free:
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kfree(ctrl);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(serdev_controller_alloc);
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static int of_serdev_register_devices(struct serdev_controller *ctrl)
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{
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struct device_node *node;
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struct serdev_device *serdev = NULL;
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int err;
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bool found = false;
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for_each_available_child_of_node(ctrl->dev.of_node, node) {
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if (!of_get_property(node, "compatible", NULL))
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continue;
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dev_dbg(&ctrl->dev, "adding child %pOF\n", node);
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serdev = serdev_device_alloc(ctrl);
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if (!serdev)
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continue;
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serdev->dev.of_node = node;
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err = serdev_device_add(serdev);
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if (err) {
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dev_err(&serdev->dev,
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"failure adding device. status %d\n", err);
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serdev_device_put(serdev);
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} else
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found = true;
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}
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if (!found)
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return -ENODEV;
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return 0;
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}
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#ifdef CONFIG_ACPI
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static acpi_status acpi_serdev_register_device(struct serdev_controller *ctrl,
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struct acpi_device *adev)
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{
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struct serdev_device *serdev = NULL;
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int err;
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if (acpi_bus_get_status(adev) || !adev->status.present ||
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acpi_device_enumerated(adev))
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return AE_OK;
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serdev = serdev_device_alloc(ctrl);
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if (!serdev) {
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dev_err(&ctrl->dev, "failed to allocate serdev device for %s\n",
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dev_name(&adev->dev));
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return AE_NO_MEMORY;
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}
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ACPI_COMPANION_SET(&serdev->dev, adev);
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acpi_device_set_enumerated(adev);
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err = serdev_device_add(serdev);
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if (err) {
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dev_err(&serdev->dev,
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"failure adding ACPI serdev device. status %d\n", err);
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serdev_device_put(serdev);
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}
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return AE_OK;
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}
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static acpi_status acpi_serdev_add_device(acpi_handle handle, u32 level,
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void *data, void **return_value)
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{
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struct serdev_controller *ctrl = data;
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struct acpi_device *adev;
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if (acpi_bus_get_device(handle, &adev))
|
|
return AE_OK;
|
|
|
|
return acpi_serdev_register_device(ctrl, adev);
|
|
}
|
|
|
|
static int acpi_serdev_register_devices(struct serdev_controller *ctrl)
|
|
{
|
|
acpi_status status;
|
|
acpi_handle handle;
|
|
|
|
handle = ACPI_HANDLE(ctrl->dev.parent);
|
|
if (!handle)
|
|
return -ENODEV;
|
|
|
|
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
|
|
acpi_serdev_add_device, NULL, ctrl, NULL);
|
|
if (ACPI_FAILURE(status))
|
|
dev_dbg(&ctrl->dev, "failed to enumerate serdev slaves\n");
|
|
|
|
if (!ctrl->serdev)
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
static inline int acpi_serdev_register_devices(struct serdev_controller *ctrl)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
#endif /* CONFIG_ACPI */
|
|
|
|
/**
|
|
* serdev_controller_add() - Add an serdev controller
|
|
* @ctrl: controller to be registered.
|
|
*
|
|
* Register a controller previously allocated via serdev_controller_alloc() with
|
|
* the serdev core.
|
|
*/
|
|
int serdev_controller_add(struct serdev_controller *ctrl)
|
|
{
|
|
int ret_of, ret_acpi, ret;
|
|
|
|
/* Can't register until after driver model init */
|
|
if (WARN_ON(!is_registered))
|
|
return -EAGAIN;
|
|
|
|
ret = device_add(&ctrl->dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
pm_runtime_enable(&ctrl->dev);
|
|
|
|
ret_of = of_serdev_register_devices(ctrl);
|
|
ret_acpi = acpi_serdev_register_devices(ctrl);
|
|
if (ret_of && ret_acpi) {
|
|
dev_dbg(&ctrl->dev, "no devices registered: of:%d acpi:%d\n",
|
|
ret_of, ret_acpi);
|
|
ret = -ENODEV;
|
|
goto err_rpm_disable;
|
|
}
|
|
|
|
dev_dbg(&ctrl->dev, "serdev%d registered: dev:%p\n",
|
|
ctrl->nr, &ctrl->dev);
|
|
return 0;
|
|
|
|
err_rpm_disable:
|
|
pm_runtime_disable(&ctrl->dev);
|
|
device_del(&ctrl->dev);
|
|
return ret;
|
|
};
|
|
EXPORT_SYMBOL_GPL(serdev_controller_add);
|
|
|
|
/* Remove a device associated with a controller */
|
|
static int serdev_remove_device(struct device *dev, void *data)
|
|
{
|
|
struct serdev_device *serdev = to_serdev_device(dev);
|
|
if (dev->type == &serdev_device_type)
|
|
serdev_device_remove(serdev);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* serdev_controller_remove(): remove an serdev controller
|
|
* @ctrl: controller to remove
|
|
*
|
|
* Remove a serdev controller. Caller is responsible for calling
|
|
* serdev_controller_put() to discard the allocated controller.
|
|
*/
|
|
void serdev_controller_remove(struct serdev_controller *ctrl)
|
|
{
|
|
int dummy;
|
|
|
|
if (!ctrl)
|
|
return;
|
|
|
|
dummy = device_for_each_child(&ctrl->dev, NULL,
|
|
serdev_remove_device);
|
|
pm_runtime_disable(&ctrl->dev);
|
|
device_del(&ctrl->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(serdev_controller_remove);
|
|
|
|
/**
|
|
* serdev_driver_register() - Register client driver with serdev core
|
|
* @sdrv: client driver to be associated with client-device.
|
|
*
|
|
* This API will register the client driver with the serdev framework.
|
|
* It is typically called from the driver's module-init function.
|
|
*/
|
|
int __serdev_device_driver_register(struct serdev_device_driver *sdrv, struct module *owner)
|
|
{
|
|
sdrv->driver.bus = &serdev_bus_type;
|
|
sdrv->driver.owner = owner;
|
|
|
|
/* force drivers to async probe so I/O is possible in probe */
|
|
sdrv->driver.probe_type = PROBE_PREFER_ASYNCHRONOUS;
|
|
|
|
return driver_register(&sdrv->driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__serdev_device_driver_register);
|
|
|
|
static void __exit serdev_exit(void)
|
|
{
|
|
bus_unregister(&serdev_bus_type);
|
|
ida_destroy(&ctrl_ida);
|
|
}
|
|
module_exit(serdev_exit);
|
|
|
|
static int __init serdev_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = bus_register(&serdev_bus_type);
|
|
if (ret)
|
|
return ret;
|
|
|
|
is_registered = true;
|
|
return 0;
|
|
}
|
|
/* Must be before serial drivers register */
|
|
postcore_initcall(serdev_init);
|
|
|
|
MODULE_AUTHOR("Rob Herring <robh@kernel.org>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("Serial attached device bus");
|