diff options
Diffstat (limited to 'drivers/bus/mhi')
| -rw-r--r-- | drivers/bus/mhi/core/Makefile | 2 | ||||
| -rw-r--r-- | drivers/bus/mhi/core/main.c | 123 |
2 files changed, 124 insertions, 1 deletions
diff --git a/drivers/bus/mhi/core/Makefile b/drivers/bus/mhi/core/Makefile index 2db32697c67f..77f7730da4bf 100644 --- a/drivers/bus/mhi/core/Makefile +++ b/drivers/bus/mhi/core/Makefile @@ -1,3 +1,3 @@ obj-$(CONFIG_MHI_BUS) := mhi.o -mhi-y := init.o +mhi-y := init.o main.o diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c new file mode 100644 index 000000000000..7c35744ec0c0 --- /dev/null +++ b/drivers/bus/mhi/core/main.c @@ -0,0 +1,123 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2018-2020, The Linux Foundation. All rights reserved. + * + */ + +#include <linux/device.h> +#include <linux/dma-direction.h> +#include <linux/dma-mapping.h> +#include <linux/interrupt.h> +#include <linux/list.h> +#include <linux/mhi.h> +#include <linux/module.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include "internal.h" + +int mhi_destroy_device(struct device *dev, void *data) +{ + struct mhi_device *mhi_dev; + struct mhi_controller *mhi_cntrl; + + if (dev->bus != &mhi_bus_type) + return 0; + + mhi_dev = to_mhi_device(dev); + mhi_cntrl = mhi_dev->mhi_cntrl; + + /* Only destroy virtual devices thats attached to bus */ + if (mhi_dev->dev_type == MHI_DEVICE_CONTROLLER) + return 0; + + dev_dbg(&mhi_cntrl->mhi_dev->dev, "destroy device for chan:%s\n", + mhi_dev->chan_name); + + /* Notify the client and remove the device from MHI bus */ + device_del(dev); + put_device(dev); + + return 0; +} + +static void mhi_notify(struct mhi_device *mhi_dev, enum mhi_callback cb_reason) +{ + struct mhi_driver *mhi_drv; + + if (!mhi_dev->dev.driver) + return; + + mhi_drv = to_mhi_driver(mhi_dev->dev.driver); + + if (mhi_drv->status_cb) + mhi_drv->status_cb(mhi_dev, cb_reason); +} + +/* Bind MHI channels to MHI devices */ +void mhi_create_devices(struct mhi_controller *mhi_cntrl) +{ + struct mhi_chan *mhi_chan; + struct mhi_device *mhi_dev; + struct device *dev = &mhi_cntrl->mhi_dev->dev; + int i, ret; + + mhi_chan = mhi_cntrl->mhi_chan; + for (i = 0; i < mhi_cntrl->max_chan; i++, mhi_chan++) { + if (!mhi_chan->configured || mhi_chan->mhi_dev || + !(mhi_chan->ee_mask & BIT(mhi_cntrl->ee))) + continue; + mhi_dev = mhi_alloc_device(mhi_cntrl); + if (!mhi_dev) + return; + + mhi_dev->dev_type = MHI_DEVICE_XFER; + switch (mhi_chan->dir) { + case DMA_TO_DEVICE: + mhi_dev->ul_chan = mhi_chan; + mhi_dev->ul_chan_id = mhi_chan->chan; + break; + case DMA_FROM_DEVICE: + /* We use dl_chan as offload channels */ + mhi_dev->dl_chan = mhi_chan; + mhi_dev->dl_chan_id = mhi_chan->chan; + break; + default: + dev_err(dev, "Direction not supported\n"); + put_device(&mhi_dev->dev); + return; + } + + get_device(&mhi_dev->dev); + mhi_chan->mhi_dev = mhi_dev; + + /* Check next channel if it matches */ + if ((i + 1) < mhi_cntrl->max_chan && mhi_chan[1].configured) { + if (!strcmp(mhi_chan[1].name, mhi_chan->name)) { + i++; + mhi_chan++; + if (mhi_chan->dir == DMA_TO_DEVICE) { + mhi_dev->ul_chan = mhi_chan; + mhi_dev->ul_chan_id = mhi_chan->chan; + } else { + mhi_dev->dl_chan = mhi_chan; + mhi_dev->dl_chan_id = mhi_chan->chan; + } + get_device(&mhi_dev->dev); + mhi_chan->mhi_dev = mhi_dev; + } + } + + /* Channel name is same for both UL and DL */ + mhi_dev->chan_name = mhi_chan->name; + dev_set_name(&mhi_dev->dev, "%04x_%s", mhi_chan->chan, + mhi_dev->chan_name); + + /* Init wakeup source if available */ + if (mhi_dev->dl_chan && mhi_dev->dl_chan->wake_capable) + device_init_wakeup(&mhi_dev->dev, true); + + ret = device_add(&mhi_dev->dev); + if (ret) + put_device(&mhi_dev->dev); + } +} |