source "drivers/staging/most/i2c/Kconfig"
-source "drivers/staging/most/hdm-usb/Kconfig"
+source "drivers/staging/most/usb/Kconfig"
endif
+++ /dev/null
-#
-# MOST USB configuration
-#
-
-config HDM_USB
- tristate "USB HDM"
- depends on USB && NET
-
- ---help---
- Say Y here if you want to connect via USB to network tranceiver.
- This device driver depends on the networking AIM.
-
- To compile this driver as a module, choose M here: the
- module will be called hdm_usb.
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * hdm_usb.c - Hardware dependent module for USB
- *
- * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/usb.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/cdev.h>
-#include <linux/device.h>
-#include <linux/list.h>
-#include <linux/completion.h>
-#include <linux/mutex.h>
-#include <linux/spinlock.h>
-#include <linux/interrupt.h>
-#include <linux/workqueue.h>
-#include <linux/sysfs.h>
-#include <linux/dma-mapping.h>
-#include <linux/etherdevice.h>
-#include <linux/uaccess.h>
-#include "most/core.h"
-
-#define USB_MTU 512
-#define NO_ISOCHRONOUS_URB 0
-#define AV_PACKETS_PER_XACT 2
-#define BUF_CHAIN_SIZE 0xFFFF
-#define MAX_NUM_ENDPOINTS 30
-#define MAX_SUFFIX_LEN 10
-#define MAX_STRING_LEN 80
-#define MAX_BUF_SIZE 0xFFFF
-
-#define USB_VENDOR_ID_SMSC 0x0424 /* VID: SMSC */
-#define USB_DEV_ID_BRDG 0xC001 /* PID: USB Bridge */
-#define USB_DEV_ID_OS81118 0xCF18 /* PID: USB OS81118 */
-#define USB_DEV_ID_OS81119 0xCF19 /* PID: USB OS81119 */
-#define USB_DEV_ID_OS81210 0xCF30 /* PID: USB OS81210 */
-/* DRCI Addresses */
-#define DRCI_REG_NI_STATE 0x0100
-#define DRCI_REG_PACKET_BW 0x0101
-#define DRCI_REG_NODE_ADDR 0x0102
-#define DRCI_REG_NODE_POS 0x0103
-#define DRCI_REG_MEP_FILTER 0x0140
-#define DRCI_REG_HASH_TBL0 0x0141
-#define DRCI_REG_HASH_TBL1 0x0142
-#define DRCI_REG_HASH_TBL2 0x0143
-#define DRCI_REG_HASH_TBL3 0x0144
-#define DRCI_REG_HW_ADDR_HI 0x0145
-#define DRCI_REG_HW_ADDR_MI 0x0146
-#define DRCI_REG_HW_ADDR_LO 0x0147
-#define DRCI_REG_BASE 0x1100
-#define DRCI_COMMAND 0x02
-#define DRCI_READ_REQ 0xA0
-#define DRCI_WRITE_REQ 0xA1
-
-/**
- * struct most_dci_obj - Direct Communication Interface
- * @kobj:position in sysfs
- * @usb_device: pointer to the usb device
- * @reg_addr: register address for arbitrary DCI access
- */
-struct most_dci_obj {
- struct kobject kobj;
- struct usb_device *usb_device;
- u16 reg_addr;
-};
-
-#define to_dci_obj(p) container_of(p, struct most_dci_obj, kobj)
-
-struct most_dev;
-
-struct clear_hold_work {
- struct work_struct ws;
- struct most_dev *mdev;
- unsigned int channel;
- int pipe;
-};
-
-#define to_clear_hold_work(w) container_of(w, struct clear_hold_work, ws)
-
-/**
- * struct most_dev - holds all usb interface specific stuff
- * @parent: parent object in sysfs
- * @usb_device: pointer to usb device
- * @iface: hardware interface
- * @cap: channel capabilities
- * @conf: channel configuration
- * @dci: direct communication interface of hardware
- * @ep_address: endpoint address table
- * @description: device description
- * @suffix: suffix for channel name
- * @channel_lock: synchronize channel access
- * @padding_active: indicates channel uses padding
- * @is_channel_healthy: health status table of each channel
- * @busy_urbs: list of anchored items
- * @io_mutex: synchronize I/O with disconnect
- * @link_stat_timer: timer for link status reports
- * @poll_work_obj: work for polling link status
- */
-struct most_dev {
- struct kobject *parent;
- struct usb_device *usb_device;
- struct most_interface iface;
- struct most_channel_capability *cap;
- struct most_channel_config *conf;
- struct most_dci_obj *dci;
- u8 *ep_address;
- char description[MAX_STRING_LEN];
- char suffix[MAX_NUM_ENDPOINTS][MAX_SUFFIX_LEN];
- spinlock_t channel_lock[MAX_NUM_ENDPOINTS]; /* sync channel access */
- bool padding_active[MAX_NUM_ENDPOINTS];
- bool is_channel_healthy[MAX_NUM_ENDPOINTS];
- struct clear_hold_work clear_work[MAX_NUM_ENDPOINTS];
- struct usb_anchor *busy_urbs;
- struct mutex io_mutex;
- struct timer_list link_stat_timer;
- struct work_struct poll_work_obj;
- void (*on_netinfo)(struct most_interface *, unsigned char,
- unsigned char *);
-};
-
-#define to_mdev(d) container_of(d, struct most_dev, iface)
-#define to_mdev_from_work(w) container_of(w, struct most_dev, poll_work_obj)
-
-static void wq_clear_halt(struct work_struct *wq_obj);
-static void wq_netinfo(struct work_struct *wq_obj);
-
-/**
- * drci_rd_reg - read a DCI register
- * @dev: usb device
- * @reg: register address
- * @buf: buffer to store data
- *
- * This is reads data from INIC's direct register communication interface
- */
-static inline int drci_rd_reg(struct usb_device *dev, u16 reg, u16 *buf)
-{
- int retval;
- __le16 *dma_buf = kzalloc(sizeof(*dma_buf), GFP_KERNEL);
- u8 req_type = USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
-
- if (!dma_buf)
- return -ENOMEM;
-
- retval = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
- DRCI_READ_REQ, req_type,
- 0x0000,
- reg, dma_buf, sizeof(*dma_buf), 5 * HZ);
- *buf = le16_to_cpu(*dma_buf);
- kfree(dma_buf);
-
- return retval;
-}
-
-/**
- * drci_wr_reg - write a DCI register
- * @dev: usb device
- * @reg: register address
- * @data: data to write
- *
- * This is writes data to INIC's direct register communication interface
- */
-static inline int drci_wr_reg(struct usb_device *dev, u16 reg, u16 data)
-{
- return usb_control_msg(dev,
- usb_sndctrlpipe(dev, 0),
- DRCI_WRITE_REQ,
- USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
- data,
- reg,
- NULL,
- 0,
- 5 * HZ);
-}
-
-static inline int start_sync_ep(struct usb_device *usb_dev, u16 ep)
-{
- return drci_wr_reg(usb_dev, DRCI_REG_BASE + DRCI_COMMAND + ep * 16, 1);
-}
-
-/**
- * get_stream_frame_size - calculate frame size of current configuration
- * @cfg: channel configuration
- */
-static unsigned int get_stream_frame_size(struct most_channel_config *cfg)
-{
- unsigned int frame_size = 0;
- unsigned int sub_size = cfg->subbuffer_size;
-
- if (!sub_size) {
- pr_warn("Misconfig: Subbuffer size zero.\n");
- return frame_size;
- }
- switch (cfg->data_type) {
- case MOST_CH_ISOC:
- frame_size = AV_PACKETS_PER_XACT * sub_size;
- break;
- case MOST_CH_SYNC:
- if (cfg->packets_per_xact == 0) {
- pr_warn("Misconfig: Packets per XACT zero\n");
- frame_size = 0;
- } else if (cfg->packets_per_xact == 0xFF) {
- frame_size = (USB_MTU / sub_size) * sub_size;
- } else {
- frame_size = cfg->packets_per_xact * sub_size;
- }
- break;
- default:
- pr_warn("Query frame size of non-streaming channel\n");
- break;
- }
- return frame_size;
-}
-
-/**
- * hdm_poison_channel - mark buffers of this channel as invalid
- * @iface: pointer to the interface
- * @channel: channel ID
- *
- * This unlinks all URBs submitted to the HCD,
- * calls the associated completion function of the core and removes
- * them from the list.
- *
- * Returns 0 on success or error code otherwise.
- */
-static int hdm_poison_channel(struct most_interface *iface, int channel)
-{
- struct most_dev *mdev = to_mdev(iface);
- unsigned long flags;
- spinlock_t *lock; /* temp. lock */
-
- if (unlikely(!iface)) {
- dev_warn(&mdev->usb_device->dev, "Poison: Bad interface.\n");
- return -EIO;
- }
- if (unlikely(channel < 0 || channel >= iface->num_channels)) {
- dev_warn(&mdev->usb_device->dev, "Channel ID out of range.\n");
- return -ECHRNG;
- }
-
- lock = mdev->channel_lock + channel;
- spin_lock_irqsave(lock, flags);
- mdev->is_channel_healthy[channel] = false;
- spin_unlock_irqrestore(lock, flags);
-
- cancel_work_sync(&mdev->clear_work[channel].ws);
-
- mutex_lock(&mdev->io_mutex);
- usb_kill_anchored_urbs(&mdev->busy_urbs[channel]);
- if (mdev->padding_active[channel])
- mdev->padding_active[channel] = false;
-
- if (mdev->conf[channel].data_type == MOST_CH_ASYNC) {
- del_timer_sync(&mdev->link_stat_timer);
- cancel_work_sync(&mdev->poll_work_obj);
- }
- mutex_unlock(&mdev->io_mutex);
- return 0;
-}
-
-/**
- * hdm_add_padding - add padding bytes
- * @mdev: most device
- * @channel: channel ID
- * @mbo: buffer object
- *
- * This inserts the INIC hardware specific padding bytes into a streaming
- * channel's buffer
- */
-static int hdm_add_padding(struct most_dev *mdev, int channel, struct mbo *mbo)
-{
- struct most_channel_config *conf = &mdev->conf[channel];
- unsigned int frame_size = get_stream_frame_size(conf);
- unsigned int j, num_frames;
-
- if (!frame_size)
- return -EIO;
- num_frames = mbo->buffer_length / frame_size;
-
- if (num_frames < 1) {
- dev_err(&mdev->usb_device->dev,
- "Missed minimal transfer unit.\n");
- return -EIO;
- }
-
- for (j = num_frames - 1; j > 0; j--)
- memmove(mbo->virt_address + j * USB_MTU,
- mbo->virt_address + j * frame_size,
- frame_size);
- mbo->buffer_length = num_frames * USB_MTU;
- return 0;
-}
-
-/**
- * hdm_remove_padding - remove padding bytes
- * @mdev: most device
- * @channel: channel ID
- * @mbo: buffer object
- *
- * This takes the INIC hardware specific padding bytes off a streaming
- * channel's buffer.
- */
-static int hdm_remove_padding(struct most_dev *mdev, int channel,
- struct mbo *mbo)
-{
- struct most_channel_config *const conf = &mdev->conf[channel];
- unsigned int frame_size = get_stream_frame_size(conf);
- unsigned int j, num_frames;
-
- if (!frame_size)
- return -EIO;
- num_frames = mbo->processed_length / USB_MTU;
-
- for (j = 1; j < num_frames; j++)
- memmove(mbo->virt_address + frame_size * j,
- mbo->virt_address + USB_MTU * j,
- frame_size);
-
- mbo->processed_length = frame_size * num_frames;
- return 0;
-}
-
-/**
- * hdm_write_completion - completion function for submitted Tx URBs
- * @urb: the URB that has been completed
- *
- * This checks the status of the completed URB. In case the URB has been
- * unlinked before, it is immediately freed. On any other error the MBO
- * transfer flag is set. On success it frees allocated resources and calls
- * the completion function.
- *
- * Context: interrupt!
- */
-static void hdm_write_completion(struct urb *urb)
-{
- struct mbo *mbo = urb->context;
- struct most_dev *mdev = to_mdev(mbo->ifp);
- unsigned int channel = mbo->hdm_channel_id;
- struct device *dev = &mdev->usb_device->dev;
- spinlock_t *lock = mdev->channel_lock + channel;
- unsigned long flags;
-
- spin_lock_irqsave(lock, flags);
-
- mbo->processed_length = 0;
- mbo->status = MBO_E_INVAL;
- if (likely(mdev->is_channel_healthy[channel])) {
- switch (urb->status) {
- case 0:
- case -ESHUTDOWN:
- mbo->processed_length = urb->actual_length;
- mbo->status = MBO_SUCCESS;
- break;
- case -EPIPE:
- dev_warn(dev, "Broken OUT pipe detected\n");
- mdev->is_channel_healthy[channel] = false;
- mdev->clear_work[channel].pipe = urb->pipe;
- schedule_work(&mdev->clear_work[channel].ws);
- break;
- case -ENODEV:
- case -EPROTO:
- mbo->status = MBO_E_CLOSE;
- break;
- }
- }
-
- spin_unlock_irqrestore(lock, flags);
-
- if (likely(mbo->complete))
- mbo->complete(mbo);
- usb_free_urb(urb);
-}
-
-/**
- * hdm_read_completion - completion function for submitted Rx URBs
- * @urb: the URB that has been completed
- *
- * This checks the status of the completed URB. In case the URB has been
- * unlinked before it is immediately freed. On any other error the MBO transfer
- * flag is set. On success it frees allocated resources, removes
- * padding bytes -if necessary- and calls the completion function.
- *
- * Context: interrupt!
- *
- * **************************************************************************
- * Error codes returned by in urb->status
- * or in iso_frame_desc[n].status (for ISO)
- * *************************************************************************
- *
- * USB device drivers may only test urb status values in completion handlers.
- * This is because otherwise there would be a race between HCDs updating
- * these values on one CPU, and device drivers testing them on another CPU.
- *
- * A transfer's actual_length may be positive even when an error has been
- * reported. That's because transfers often involve several packets, so that
- * one or more packets could finish before an error stops further endpoint I/O.
- *
- * For isochronous URBs, the urb status value is non-zero only if the URB is
- * unlinked, the device is removed, the host controller is disabled or the total
- * transferred length is less than the requested length and the URB_SHORT_NOT_OK
- * flag is set. Completion handlers for isochronous URBs should only see
- * urb->status set to zero, -ENOENT, -ECONNRESET, -ESHUTDOWN, or -EREMOTEIO.
- * Individual frame descriptor status fields may report more status codes.
- *
- *
- * 0 Transfer completed successfully
- *
- * -ENOENT URB was synchronously unlinked by usb_unlink_urb
- *
- * -EINPROGRESS URB still pending, no results yet
- * (That is, if drivers see this it's a bug.)
- *
- * -EPROTO (*, **) a) bitstuff error
- * b) no response packet received within the
- * prescribed bus turn-around time
- * c) unknown USB error
- *
- * -EILSEQ (*, **) a) CRC mismatch
- * b) no response packet received within the
- * prescribed bus turn-around time
- * c) unknown USB error
- *
- * Note that often the controller hardware does not
- * distinguish among cases a), b), and c), so a
- * driver cannot tell whether there was a protocol
- * error, a failure to respond (often caused by
- * device disconnect), or some other fault.
- *
- * -ETIME (**) No response packet received within the prescribed
- * bus turn-around time. This error may instead be
- * reported as -EPROTO or -EILSEQ.
- *
- * -ETIMEDOUT Synchronous USB message functions use this code
- * to indicate timeout expired before the transfer
- * completed, and no other error was reported by HC.
- *
- * -EPIPE (**) Endpoint stalled. For non-control endpoints,
- * reset this status with usb_clear_halt().
- *
- * -ECOMM During an IN transfer, the host controller
- * received data from an endpoint faster than it
- * could be written to system memory
- *
- * -ENOSR During an OUT transfer, the host controller
- * could not retrieve data from system memory fast
- * enough to keep up with the USB data rate
- *
- * -EOVERFLOW (*) The amount of data returned by the endpoint was
- * greater than either the max packet size of the
- * endpoint or the remaining buffer size. "Babble".
- *
- * -EREMOTEIO The data read from the endpoint did not fill the
- * specified buffer, and URB_SHORT_NOT_OK was set in
- * urb->transfer_flags.
- *
- * -ENODEV Device was removed. Often preceded by a burst of
- * other errors, since the hub driver doesn't detect
- * device removal events immediately.
- *
- * -EXDEV ISO transfer only partially completed
- * (only set in iso_frame_desc[n].status, not urb->status)
- *
- * -EINVAL ISO madness, if this happens: Log off and go home
- *
- * -ECONNRESET URB was asynchronously unlinked by usb_unlink_urb
- *
- * -ESHUTDOWN The device or host controller has been disabled due
- * to some problem that could not be worked around,
- * such as a physical disconnect.
- *
- *
- * (*) Error codes like -EPROTO, -EILSEQ and -EOVERFLOW normally indicate
- * hardware problems such as bad devices (including firmware) or cables.
- *
- * (**) This is also one of several codes that different kinds of host
- * controller use to indicate a transfer has failed because of device
- * disconnect. In the interval before the hub driver starts disconnect
- * processing, devices may receive such fault reports for every request.
- *
- * See <https://www.kernel.org/doc/Documentation/driver-api/usb/error-codes.rst>
- */
-static void hdm_read_completion(struct urb *urb)
-{
- struct mbo *mbo = urb->context;
- struct most_dev *mdev = to_mdev(mbo->ifp);
- unsigned int channel = mbo->hdm_channel_id;
- struct device *dev = &mdev->usb_device->dev;
- spinlock_t *lock = mdev->channel_lock + channel;
- unsigned long flags;
-
- spin_lock_irqsave(lock, flags);
-
- mbo->processed_length = 0;
- mbo->status = MBO_E_INVAL;
- if (likely(mdev->is_channel_healthy[channel])) {
- switch (urb->status) {
- case 0:
- case -ESHUTDOWN:
- mbo->processed_length = urb->actual_length;
- mbo->status = MBO_SUCCESS;
- if (mdev->padding_active[channel] &&
- hdm_remove_padding(mdev, channel, mbo)) {
- mbo->processed_length = 0;
- mbo->status = MBO_E_INVAL;
- }
- break;
- case -EPIPE:
- dev_warn(dev, "Broken IN pipe detected\n");
- mdev->is_channel_healthy[channel] = false;
- mdev->clear_work[channel].pipe = urb->pipe;
- schedule_work(&mdev->clear_work[channel].ws);
- break;
- case -ENODEV:
- case -EPROTO:
- mbo->status = MBO_E_CLOSE;
- break;
- case -EOVERFLOW:
- dev_warn(dev, "Babble on IN pipe detected\n");
- break;
- }
- }
-
- spin_unlock_irqrestore(lock, flags);
-
- if (likely(mbo->complete))
- mbo->complete(mbo);
- usb_free_urb(urb);
-}
-
-/**
- * hdm_enqueue - receive a buffer to be used for data transfer
- * @iface: interface to enqueue to
- * @channel: ID of the channel
- * @mbo: pointer to the buffer object
- *
- * This allocates a new URB and fills it according to the channel
- * that is being used for transmission of data. Before the URB is
- * submitted it is stored in the private anchor list.
- *
- * Returns 0 on success. On any error the URB is freed and a error code
- * is returned.
- *
- * Context: Could in _some_ cases be interrupt!
- */
-static int hdm_enqueue(struct most_interface *iface, int channel,
- struct mbo *mbo)
-{
- struct most_dev *mdev;
- struct most_channel_config *conf;
- struct device *dev;
- int retval = 0;
- struct urb *urb;
- unsigned long length;
- void *virt_address;
-
- if (unlikely(!iface || !mbo))
- return -EIO;
- if (unlikely(iface->num_channels <= channel || channel < 0))
- return -ECHRNG;
-
- mdev = to_mdev(iface);
- conf = &mdev->conf[channel];
- dev = &mdev->usb_device->dev;
-
- if (!mdev->usb_device)
- return -ENODEV;
-
- urb = usb_alloc_urb(NO_ISOCHRONOUS_URB, GFP_ATOMIC);
- if (!urb)
- return -ENOMEM;
-
- if ((conf->direction & MOST_CH_TX) && mdev->padding_active[channel] &&
- hdm_add_padding(mdev, channel, mbo)) {
- retval = -EIO;
- goto _error;
- }
-
- urb->transfer_dma = mbo->bus_address;
- virt_address = mbo->virt_address;
- length = mbo->buffer_length;
-
- if (conf->direction & MOST_CH_TX) {
- usb_fill_bulk_urb(urb, mdev->usb_device,
- usb_sndbulkpipe(mdev->usb_device,
- mdev->ep_address[channel]),
- virt_address,
- length,
- hdm_write_completion,
- mbo);
- if (conf->data_type != MOST_CH_ISOC)
- urb->transfer_flags |= URB_ZERO_PACKET;
- } else {
- usb_fill_bulk_urb(urb, mdev->usb_device,
- usb_rcvbulkpipe(mdev->usb_device,
- mdev->ep_address[channel]),
- virt_address,
- length + conf->extra_len,
- hdm_read_completion,
- mbo);
- }
- urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
-
- usb_anchor_urb(urb, &mdev->busy_urbs[channel]);
-
- retval = usb_submit_urb(urb, GFP_KERNEL);
- if (retval) {
- dev_err(dev, "URB submit failed with error %d.\n", retval);
- goto _error_1;
- }
- return 0;
-
-_error_1:
- usb_unanchor_urb(urb);
-_error:
- usb_free_urb(urb);
- return retval;
-}
-
-/**
- * hdm_configure_channel - receive channel configuration from core
- * @iface: interface
- * @channel: channel ID
- * @conf: structure that holds the configuration information
- *
- * The attached network interface controller (NIC) supports a padding mode
- * to avoid short packets on USB, hence increasing the performance due to a
- * lower interrupt load. This mode is default for synchronous data and can
- * be switched on for isochronous data. In case padding is active the
- * driver needs to know the frame size of the payload in order to calculate
- * the number of bytes it needs to pad when transmitting or to cut off when
- * receiving data.
- *
- */
-static int hdm_configure_channel(struct most_interface *iface, int channel,
- struct most_channel_config *conf)
-{
- unsigned int num_frames;
- unsigned int frame_size;
- struct most_dev *mdev = to_mdev(iface);
- struct device *dev = &mdev->usb_device->dev;
-
- mdev->is_channel_healthy[channel] = true;
- mdev->clear_work[channel].channel = channel;
- mdev->clear_work[channel].mdev = mdev;
- INIT_WORK(&mdev->clear_work[channel].ws, wq_clear_halt);
-
- if (unlikely(!iface || !conf)) {
- dev_err(dev, "Bad interface or config pointer.\n");
- return -EINVAL;
- }
- if (unlikely(channel < 0 || channel >= iface->num_channels)) {
- dev_err(dev, "Channel ID out of range.\n");
- return -EINVAL;
- }
- if (!conf->num_buffers || !conf->buffer_size) {
- dev_err(dev, "Misconfig: buffer size or #buffers zero.\n");
- return -EINVAL;
- }
-
- if (conf->data_type != MOST_CH_SYNC &&
- !(conf->data_type == MOST_CH_ISOC &&
- conf->packets_per_xact != 0xFF)) {
- mdev->padding_active[channel] = false;
- /*
- * Since the NIC's padding mode is not going to be
- * used, we can skip the frame size calculations and
- * move directly on to exit.
- */
- goto exit;
- }
-
- mdev->padding_active[channel] = true;
-
- frame_size = get_stream_frame_size(conf);
- if (frame_size == 0 || frame_size > USB_MTU) {
- dev_warn(dev, "Misconfig: frame size wrong\n");
- return -EINVAL;
- }
-
- num_frames = conf->buffer_size / frame_size;
-
- if (conf->buffer_size % frame_size) {
- u16 old_size = conf->buffer_size;
-
- conf->buffer_size = num_frames * frame_size;
- dev_warn(dev, "%s: fixed buffer size (%d -> %d)\n",
- mdev->suffix[channel], old_size, conf->buffer_size);
- }
-
- /* calculate extra length to comply w/ HW padding */
- conf->extra_len = num_frames * (USB_MTU - frame_size);
-
-exit:
- mdev->conf[channel] = *conf;
- if (conf->data_type == MOST_CH_ASYNC) {
- u16 ep = mdev->ep_address[channel];
-
- if (start_sync_ep(mdev->usb_device, ep) < 0)
- dev_warn(dev, "sync for ep%02x failed", ep);
- }
- return 0;
-}
-
-/**
- * hdm_request_netinfo - request network information
- * @iface: pointer to interface
- * @channel: channel ID
- *
- * This is used as trigger to set up the link status timer that
- * polls for the NI state of the INIC every 2 seconds.
- *
- */
-static void hdm_request_netinfo(struct most_interface *iface, int channel,
- void (*on_netinfo)(struct most_interface *,
- unsigned char,
- unsigned char *))
-{
- struct most_dev *mdev;
-
- BUG_ON(!iface);
- mdev = to_mdev(iface);
- mdev->on_netinfo = on_netinfo;
- if (!on_netinfo)
- return;
-
- mdev->link_stat_timer.expires = jiffies + HZ;
- mod_timer(&mdev->link_stat_timer, mdev->link_stat_timer.expires);
-}
-
-/**
- * link_stat_timer_handler - schedule work obtaining mac address and link status
- * @data: pointer to USB device instance
- *
- * The handler runs in interrupt context. That's why we need to defer the
- * tasks to a work queue.
- */
-static void link_stat_timer_handler(struct timer_list *t)
-{
- struct most_dev *mdev = from_timer(mdev, t, link_stat_timer);
-
- schedule_work(&mdev->poll_work_obj);
- mdev->link_stat_timer.expires = jiffies + (2 * HZ);
- add_timer(&mdev->link_stat_timer);
-}
-
-/**
- * wq_netinfo - work queue function to deliver latest networking information
- * @wq_obj: object that holds data for our deferred work to do
- *
- * This retrieves the network interface status of the USB INIC
- */
-static void wq_netinfo(struct work_struct *wq_obj)
-{
- struct most_dev *mdev = to_mdev_from_work(wq_obj);
- struct usb_device *usb_device = mdev->usb_device;
- struct device *dev = &usb_device->dev;
- u16 hi, mi, lo, link;
- u8 hw_addr[6];
-
- if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_HI, &hi) < 0) {
- dev_err(dev, "Vendor request 'hw_addr_hi' failed\n");
- return;
- }
-
- if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_MI, &mi) < 0) {
- dev_err(dev, "Vendor request 'hw_addr_mid' failed\n");
- return;
- }
-
- if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_LO, &lo) < 0) {
- dev_err(dev, "Vendor request 'hw_addr_low' failed\n");
- return;
- }
-
- if (drci_rd_reg(usb_device, DRCI_REG_NI_STATE, &link) < 0) {
- dev_err(dev, "Vendor request 'link status' failed\n");
- return;
- }
-
- hw_addr[0] = hi >> 8;
- hw_addr[1] = hi;
- hw_addr[2] = mi >> 8;
- hw_addr[3] = mi;
- hw_addr[4] = lo >> 8;
- hw_addr[5] = lo;
-
- if (mdev->on_netinfo)
- mdev->on_netinfo(&mdev->iface, link, hw_addr);
-}
-
-/**
- * wq_clear_halt - work queue function
- * @wq_obj: work_struct object to execute
- *
- * This sends a clear_halt to the given USB pipe.
- */
-static void wq_clear_halt(struct work_struct *wq_obj)
-{
- struct clear_hold_work *clear_work = to_clear_hold_work(wq_obj);
- struct most_dev *mdev = clear_work->mdev;
- unsigned int channel = clear_work->channel;
- int pipe = clear_work->pipe;
-
- mutex_lock(&mdev->io_mutex);
- most_stop_enqueue(&mdev->iface, channel);
- usb_kill_anchored_urbs(&mdev->busy_urbs[channel]);
- if (usb_clear_halt(mdev->usb_device, pipe))
- dev_warn(&mdev->usb_device->dev, "Failed to reset endpoint.\n");
-
- mdev->is_channel_healthy[channel] = true;
- most_resume_enqueue(&mdev->iface, channel);
- mutex_unlock(&mdev->io_mutex);
-}
-
-/**
- * hdm_usb_fops - file operation table for USB driver
- */
-static const struct file_operations hdm_usb_fops = {
- .owner = THIS_MODULE,
-};
-
-/**
- * usb_device_id - ID table for HCD device probing
- */
-static const struct usb_device_id usbid[] = {
- { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_BRDG), },
- { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81118), },
- { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81119), },
- { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81210), },
- { } /* Terminating entry */
-};
-
-#define MOST_DCI_RO_ATTR(_name) \
- struct most_dci_attribute most_dci_attr_##_name = \
- __ATTR(_name, 0444, show_value, NULL)
-
-#define MOST_DCI_ATTR(_name) \
- struct most_dci_attribute most_dci_attr_##_name = \
- __ATTR(_name, 0644, show_value, store_value)
-
-#define MOST_DCI_WO_ATTR(_name) \
- struct most_dci_attribute most_dci_attr_##_name = \
- __ATTR(_name, 0200, NULL, store_value)
-
-/**
- * struct most_dci_attribute - to access the attributes of a dci object
- * @attr: attributes of a dci object
- * @show: pointer to the show function
- * @store: pointer to the store function
- */
-struct most_dci_attribute {
- struct attribute attr;
- ssize_t (*show)(struct most_dci_obj *d,
- struct most_dci_attribute *attr,
- char *buf);
- ssize_t (*store)(struct most_dci_obj *d,
- struct most_dci_attribute *attr,
- const char *buf,
- size_t count);
-};
-
-#define to_dci_attr(a) container_of(a, struct most_dci_attribute, attr)
-
-/**
- * dci_attr_show - show function for dci object
- * @kobj: pointer to kobject
- * @attr: pointer to attribute struct
- * @buf: buffer
- */
-static ssize_t dci_attr_show(struct kobject *kobj, struct attribute *attr,
- char *buf)
-{
- struct most_dci_attribute *dci_attr = to_dci_attr(attr);
- struct most_dci_obj *dci_obj = to_dci_obj(kobj);
-
- if (!dci_attr->show)
- return -EIO;
-
- return dci_attr->show(dci_obj, dci_attr, buf);
-}
-
-/**
- * dci_attr_store - store function for dci object
- * @kobj: pointer to kobject
- * @attr: pointer to attribute struct
- * @buf: buffer
- * @len: length of buffer
- */
-static ssize_t dci_attr_store(struct kobject *kobj,
- struct attribute *attr,
- const char *buf,
- size_t len)
-{
- struct most_dci_attribute *dci_attr = to_dci_attr(attr);
- struct most_dci_obj *dci_obj = to_dci_obj(kobj);
-
- if (!dci_attr->store)
- return -EIO;
-
- return dci_attr->store(dci_obj, dci_attr, buf, len);
-}
-
-static const struct sysfs_ops most_dci_sysfs_ops = {
- .show = dci_attr_show,
- .store = dci_attr_store,
-};
-
-/**
- * most_dci_release - release function for dci object
- * @kobj: pointer to kobject
- *
- * This frees the memory allocated for the dci object
- */
-static void most_dci_release(struct kobject *kobj)
-{
- struct most_dci_obj *dci_obj = to_dci_obj(kobj);
-
- kfree(dci_obj);
-}
-
-struct regs {
- const char *name;
- u16 reg;
-};
-
-static const struct regs ro_regs[] = {
- { "ni_state", DRCI_REG_NI_STATE },
- { "packet_bandwidth", DRCI_REG_PACKET_BW },
- { "node_address", DRCI_REG_NODE_ADDR },
- { "node_position", DRCI_REG_NODE_POS },
-};
-
-static const struct regs rw_regs[] = {
- { "mep_filter", DRCI_REG_MEP_FILTER },
- { "mep_hash0", DRCI_REG_HASH_TBL0 },
- { "mep_hash1", DRCI_REG_HASH_TBL1 },
- { "mep_hash2", DRCI_REG_HASH_TBL2 },
- { "mep_hash3", DRCI_REG_HASH_TBL3 },
- { "mep_eui48_hi", DRCI_REG_HW_ADDR_HI },
- { "mep_eui48_mi", DRCI_REG_HW_ADDR_MI },
- { "mep_eui48_lo", DRCI_REG_HW_ADDR_LO },
-};
-
-static int get_stat_reg_addr(const struct regs *regs, int size,
- const char *name, u16 *reg_addr)
-{
- int i;
-
- for (i = 0; i < size; i++) {
- if (!strcmp(name, regs[i].name)) {
- *reg_addr = regs[i].reg;
- return 0;
- }
- }
- return -EFAULT;
-}
-
-#define get_static_reg_addr(regs, name, reg_addr) \
- get_stat_reg_addr(regs, ARRAY_SIZE(regs), name, reg_addr)
-
-static ssize_t show_value(struct most_dci_obj *dci_obj,
- struct most_dci_attribute *attr, char *buf)
-{
- const char *name = attr->attr.name;
- u16 val;
- u16 reg_addr;
- int err;
-
- if (!strcmp(name, "arb_address"))
- return snprintf(buf, PAGE_SIZE, "%04x\n", dci_obj->reg_addr);
-
- if (!strcmp(name, "arb_value"))
- reg_addr = dci_obj->reg_addr;
- else if (get_static_reg_addr(ro_regs, name, ®_addr) &&
- get_static_reg_addr(rw_regs, name, ®_addr))
- return -EFAULT;
-
- err = drci_rd_reg(dci_obj->usb_device, reg_addr, &val);
- if (err < 0)
- return err;
-
- return snprintf(buf, PAGE_SIZE, "%04x\n", val);
-}
-
-static ssize_t store_value(struct most_dci_obj *dci_obj,
- struct most_dci_attribute *attr,
- const char *buf, size_t count)
-{
- u16 val;
- u16 reg_addr;
- const char *name = attr->attr.name;
- struct usb_device *usb_dev = dci_obj->usb_device;
- int err = kstrtou16(buf, 16, &val);
-
- if (err)
- return err;
-
- if (!strcmp(name, "arb_address")) {
- dci_obj->reg_addr = val;
- return count;
- }
-
- if (!strcmp(name, "arb_value"))
- err = drci_wr_reg(usb_dev, dci_obj->reg_addr, val);
- else if (!strcmp(name, "sync_ep"))
- err = start_sync_ep(usb_dev, val);
- else if (!get_static_reg_addr(rw_regs, name, ®_addr))
- err = drci_wr_reg(usb_dev, reg_addr, val);
- else
- return -EFAULT;
-
- if (err < 0)
- return err;
-
- return count;
-}
-
-static MOST_DCI_RO_ATTR(ni_state);
-static MOST_DCI_RO_ATTR(packet_bandwidth);
-static MOST_DCI_RO_ATTR(node_address);
-static MOST_DCI_RO_ATTR(node_position);
-static MOST_DCI_WO_ATTR(sync_ep);
-static MOST_DCI_ATTR(mep_filter);
-static MOST_DCI_ATTR(mep_hash0);
-static MOST_DCI_ATTR(mep_hash1);
-static MOST_DCI_ATTR(mep_hash2);
-static MOST_DCI_ATTR(mep_hash3);
-static MOST_DCI_ATTR(mep_eui48_hi);
-static MOST_DCI_ATTR(mep_eui48_mi);
-static MOST_DCI_ATTR(mep_eui48_lo);
-static MOST_DCI_ATTR(arb_address);
-static MOST_DCI_ATTR(arb_value);
-
-/**
- * most_dci_def_attrs - array of default attribute files of the dci object
- */
-static struct attribute *most_dci_def_attrs[] = {
- &most_dci_attr_ni_state.attr,
- &most_dci_attr_packet_bandwidth.attr,
- &most_dci_attr_node_address.attr,
- &most_dci_attr_node_position.attr,
- &most_dci_attr_sync_ep.attr,
- &most_dci_attr_mep_filter.attr,
- &most_dci_attr_mep_hash0.attr,
- &most_dci_attr_mep_hash1.attr,
- &most_dci_attr_mep_hash2.attr,
- &most_dci_attr_mep_hash3.attr,
- &most_dci_attr_mep_eui48_hi.attr,
- &most_dci_attr_mep_eui48_mi.attr,
- &most_dci_attr_mep_eui48_lo.attr,
- &most_dci_attr_arb_address.attr,
- &most_dci_attr_arb_value.attr,
- NULL,
-};
-
-/**
- * DCI ktype
- */
-static struct kobj_type most_dci_ktype = {
- .sysfs_ops = &most_dci_sysfs_ops,
- .release = most_dci_release,
- .default_attrs = most_dci_def_attrs,
-};
-
-/**
- * create_most_dci_obj - allocates a dci object
- * @parent: parent kobject
- *
- * This creates a dci object and registers it with sysfs.
- * Returns a pointer to the object or NULL when something went wrong.
- */
-static struct
-most_dci_obj *create_most_dci_obj(struct kobject *parent)
-{
- struct most_dci_obj *most_dci = kzalloc(sizeof(*most_dci), GFP_KERNEL);
- int retval;
-
- if (!most_dci)
- return NULL;
-
- retval = kobject_init_and_add(&most_dci->kobj, &most_dci_ktype, parent,
- "dci");
- if (retval) {
- kobject_put(&most_dci->kobj);
- return NULL;
- }
- return most_dci;
-}
-
-/**
- * destroy_most_dci_obj - DCI object release function
- * @p: pointer to dci object
- */
-static void destroy_most_dci_obj(struct most_dci_obj *p)
-{
- kobject_put(&p->kobj);
-}
-
-/**
- * hdm_probe - probe function of USB device driver
- * @interface: Interface of the attached USB device
- * @id: Pointer to the USB ID table.
- *
- * This allocates and initializes the device instance, adds the new
- * entry to the internal list, scans the USB descriptors and registers
- * the interface with the core.
- * Additionally, the DCI objects are created and the hardware is sync'd.
- *
- * Return 0 on success. In case of an error a negative number is returned.
- */
-static int
-hdm_probe(struct usb_interface *interface, const struct usb_device_id *id)
-{
- struct usb_host_interface *usb_iface_desc = interface->cur_altsetting;
- struct usb_device *usb_dev = interface_to_usbdev(interface);
- struct device *dev = &usb_dev->dev;
- struct most_dev *mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
- unsigned int i;
- unsigned int num_endpoints;
- struct most_channel_capability *tmp_cap;
- struct usb_endpoint_descriptor *ep_desc;
- int ret = 0;
-
- if (!mdev)
- goto exit_ENOMEM;
-
- usb_set_intfdata(interface, mdev);
- num_endpoints = usb_iface_desc->desc.bNumEndpoints;
- mutex_init(&mdev->io_mutex);
- INIT_WORK(&mdev->poll_work_obj, wq_netinfo);
- timer_setup(&mdev->link_stat_timer, link_stat_timer_handler, 0);
-
- mdev->usb_device = usb_dev;
- mdev->link_stat_timer.expires = jiffies + (2 * HZ);
-
- mdev->iface.mod = hdm_usb_fops.owner;
- mdev->iface.interface = ITYPE_USB;
- mdev->iface.configure = hdm_configure_channel;
- mdev->iface.request_netinfo = hdm_request_netinfo;
- mdev->iface.enqueue = hdm_enqueue;
- mdev->iface.poison_channel = hdm_poison_channel;
- mdev->iface.description = mdev->description;
- mdev->iface.num_channels = num_endpoints;
-
- snprintf(mdev->description, sizeof(mdev->description),
- "usb_device %d-%s:%d.%d",
- usb_dev->bus->busnum,
- usb_dev->devpath,
- usb_dev->config->desc.bConfigurationValue,
- usb_iface_desc->desc.bInterfaceNumber);
-
- mdev->conf = kcalloc(num_endpoints, sizeof(*mdev->conf), GFP_KERNEL);
- if (!mdev->conf)
- goto exit_free;
-
- mdev->cap = kcalloc(num_endpoints, sizeof(*mdev->cap), GFP_KERNEL);
- if (!mdev->cap)
- goto exit_free1;
-
- mdev->iface.channel_vector = mdev->cap;
- mdev->iface.priv = NULL;
-
- mdev->ep_address =
- kcalloc(num_endpoints, sizeof(*mdev->ep_address), GFP_KERNEL);
- if (!mdev->ep_address)
- goto exit_free2;
-
- mdev->busy_urbs =
- kcalloc(num_endpoints, sizeof(*mdev->busy_urbs), GFP_KERNEL);
- if (!mdev->busy_urbs)
- goto exit_free3;
-
- tmp_cap = mdev->cap;
- for (i = 0; i < num_endpoints; i++) {
- ep_desc = &usb_iface_desc->endpoint[i].desc;
- mdev->ep_address[i] = ep_desc->bEndpointAddress;
- mdev->padding_active[i] = false;
- mdev->is_channel_healthy[i] = true;
-
- snprintf(&mdev->suffix[i][0], MAX_SUFFIX_LEN, "ep%02x",
- mdev->ep_address[i]);
-
- tmp_cap->name_suffix = &mdev->suffix[i][0];
- tmp_cap->buffer_size_packet = MAX_BUF_SIZE;
- tmp_cap->buffer_size_streaming = MAX_BUF_SIZE;
- tmp_cap->num_buffers_packet = BUF_CHAIN_SIZE;
- tmp_cap->num_buffers_streaming = BUF_CHAIN_SIZE;
- tmp_cap->data_type = MOST_CH_CONTROL | MOST_CH_ASYNC |
- MOST_CH_ISOC | MOST_CH_SYNC;
- if (usb_endpoint_dir_in(ep_desc))
- tmp_cap->direction = MOST_CH_RX;
- else
- tmp_cap->direction = MOST_CH_TX;
- tmp_cap++;
- init_usb_anchor(&mdev->busy_urbs[i]);
- spin_lock_init(&mdev->channel_lock[i]);
- }
- dev_notice(dev, "claimed gadget: Vendor=%4.4x ProdID=%4.4x Bus=%02x Device=%02x\n",
- le16_to_cpu(usb_dev->descriptor.idVendor),
- le16_to_cpu(usb_dev->descriptor.idProduct),
- usb_dev->bus->busnum,
- usb_dev->devnum);
-
- dev_notice(dev, "device path: /sys/bus/usb/devices/%d-%s:%d.%d\n",
- usb_dev->bus->busnum,
- usb_dev->devpath,
- usb_dev->config->desc.bConfigurationValue,
- usb_iface_desc->desc.bInterfaceNumber);
-
- mdev->parent = most_register_interface(&mdev->iface);
- if (IS_ERR(mdev->parent)) {
- ret = PTR_ERR(mdev->parent);
- goto exit_free4;
- }
-
- mutex_lock(&mdev->io_mutex);
- if (le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81118 ||
- le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81119 ||
- le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81210) {
- /* this increments the reference count of the instance
- * object of the core
- */
- mdev->dci = create_most_dci_obj(mdev->parent);
- if (!mdev->dci) {
- mutex_unlock(&mdev->io_mutex);
- most_deregister_interface(&mdev->iface);
- ret = -ENOMEM;
- goto exit_free4;
- }
-
- kobject_uevent(&mdev->dci->kobj, KOBJ_ADD);
- mdev->dci->usb_device = mdev->usb_device;
- }
- mutex_unlock(&mdev->io_mutex);
- return 0;
-
-exit_free4:
- kfree(mdev->busy_urbs);
-exit_free3:
- kfree(mdev->ep_address);
-exit_free2:
- kfree(mdev->cap);
-exit_free1:
- kfree(mdev->conf);
-exit_free:
- kfree(mdev);
-exit_ENOMEM:
- if (ret == 0 || ret == -ENOMEM) {
- ret = -ENOMEM;
- dev_err(dev, "out of memory\n");
- }
- return ret;
-}
-
-/**
- * hdm_disconnect - disconnect function of USB device driver
- * @interface: Interface of the attached USB device
- *
- * This deregisters the interface with the core, removes the kernel timer
- * and frees resources.
- *
- * Context: hub kernel thread
- */
-static void hdm_disconnect(struct usb_interface *interface)
-{
- struct most_dev *mdev = usb_get_intfdata(interface);
-
- mutex_lock(&mdev->io_mutex);
- usb_set_intfdata(interface, NULL);
- mdev->usb_device = NULL;
- mutex_unlock(&mdev->io_mutex);
-
- del_timer_sync(&mdev->link_stat_timer);
- cancel_work_sync(&mdev->poll_work_obj);
-
- destroy_most_dci_obj(mdev->dci);
- most_deregister_interface(&mdev->iface);
-
- kfree(mdev->busy_urbs);
- kfree(mdev->cap);
- kfree(mdev->conf);
- kfree(mdev->ep_address);
- kfree(mdev);
-}
-
-static struct usb_driver hdm_usb = {
- .name = "hdm_usb",
- .id_table = usbid,
- .probe = hdm_probe,
- .disconnect = hdm_disconnect,
-};
-
-module_usb_driver(hdm_usb);
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");
-MODULE_DESCRIPTION("HDM_4_USB");
--- /dev/null
+#
+# MOST USB configuration
+#
+
+config MOST_USB
+ tristate "USB"
+ depends on USB && NET
+ ---help---
+ Say Y here if you want to connect via USB to network tranceiver.
+ This device driver depends on the networking AIM.
+
+ To compile this driver as a module, choose M here: the
+ module will be called most_usb.
--- /dev/null
+obj-$(CONFIG_MOST_USB) += most_usb.o
+
+most_usb-objs := usb.o
+ccflags-y += -Idrivers/staging/
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * usb.c - Hardware dependent module for USB
+ *
+ * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/usb.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/completion.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/sysfs.h>
+#include <linux/dma-mapping.h>
+#include <linux/etherdevice.h>
+#include <linux/uaccess.h>
+#include "most/core.h"
+
+#define USB_MTU 512
+#define NO_ISOCHRONOUS_URB 0
+#define AV_PACKETS_PER_XACT 2
+#define BUF_CHAIN_SIZE 0xFFFF
+#define MAX_NUM_ENDPOINTS 30
+#define MAX_SUFFIX_LEN 10
+#define MAX_STRING_LEN 80
+#define MAX_BUF_SIZE 0xFFFF
+
+#define USB_VENDOR_ID_SMSC 0x0424 /* VID: SMSC */
+#define USB_DEV_ID_BRDG 0xC001 /* PID: USB Bridge */
+#define USB_DEV_ID_OS81118 0xCF18 /* PID: USB OS81118 */
+#define USB_DEV_ID_OS81119 0xCF19 /* PID: USB OS81119 */
+#define USB_DEV_ID_OS81210 0xCF30 /* PID: USB OS81210 */
+/* DRCI Addresses */
+#define DRCI_REG_NI_STATE 0x0100
+#define DRCI_REG_PACKET_BW 0x0101
+#define DRCI_REG_NODE_ADDR 0x0102
+#define DRCI_REG_NODE_POS 0x0103
+#define DRCI_REG_MEP_FILTER 0x0140
+#define DRCI_REG_HASH_TBL0 0x0141
+#define DRCI_REG_HASH_TBL1 0x0142
+#define DRCI_REG_HASH_TBL2 0x0143
+#define DRCI_REG_HASH_TBL3 0x0144
+#define DRCI_REG_HW_ADDR_HI 0x0145
+#define DRCI_REG_HW_ADDR_MI 0x0146
+#define DRCI_REG_HW_ADDR_LO 0x0147
+#define DRCI_REG_BASE 0x1100
+#define DRCI_COMMAND 0x02
+#define DRCI_READ_REQ 0xA0
+#define DRCI_WRITE_REQ 0xA1
+
+/**
+ * struct most_dci_obj - Direct Communication Interface
+ * @kobj:position in sysfs
+ * @usb_device: pointer to the usb device
+ * @reg_addr: register address for arbitrary DCI access
+ */
+struct most_dci_obj {
+ struct kobject kobj;
+ struct usb_device *usb_device;
+ u16 reg_addr;
+};
+
+#define to_dci_obj(p) container_of(p, struct most_dci_obj, kobj)
+
+struct most_dev;
+
+struct clear_hold_work {
+ struct work_struct ws;
+ struct most_dev *mdev;
+ unsigned int channel;
+ int pipe;
+};
+
+#define to_clear_hold_work(w) container_of(w, struct clear_hold_work, ws)
+
+/**
+ * struct most_dev - holds all usb interface specific stuff
+ * @parent: parent object in sysfs
+ * @usb_device: pointer to usb device
+ * @iface: hardware interface
+ * @cap: channel capabilities
+ * @conf: channel configuration
+ * @dci: direct communication interface of hardware
+ * @ep_address: endpoint address table
+ * @description: device description
+ * @suffix: suffix for channel name
+ * @channel_lock: synchronize channel access
+ * @padding_active: indicates channel uses padding
+ * @is_channel_healthy: health status table of each channel
+ * @busy_urbs: list of anchored items
+ * @io_mutex: synchronize I/O with disconnect
+ * @link_stat_timer: timer for link status reports
+ * @poll_work_obj: work for polling link status
+ */
+struct most_dev {
+ struct kobject *parent;
+ struct usb_device *usb_device;
+ struct most_interface iface;
+ struct most_channel_capability *cap;
+ struct most_channel_config *conf;
+ struct most_dci_obj *dci;
+ u8 *ep_address;
+ char description[MAX_STRING_LEN];
+ char suffix[MAX_NUM_ENDPOINTS][MAX_SUFFIX_LEN];
+ spinlock_t channel_lock[MAX_NUM_ENDPOINTS]; /* sync channel access */
+ bool padding_active[MAX_NUM_ENDPOINTS];
+ bool is_channel_healthy[MAX_NUM_ENDPOINTS];
+ struct clear_hold_work clear_work[MAX_NUM_ENDPOINTS];
+ struct usb_anchor *busy_urbs;
+ struct mutex io_mutex;
+ struct timer_list link_stat_timer;
+ struct work_struct poll_work_obj;
+ void (*on_netinfo)(struct most_interface *, unsigned char,
+ unsigned char *);
+};
+
+#define to_mdev(d) container_of(d, struct most_dev, iface)
+#define to_mdev_from_work(w) container_of(w, struct most_dev, poll_work_obj)
+
+static void wq_clear_halt(struct work_struct *wq_obj);
+static void wq_netinfo(struct work_struct *wq_obj);
+
+/**
+ * drci_rd_reg - read a DCI register
+ * @dev: usb device
+ * @reg: register address
+ * @buf: buffer to store data
+ *
+ * This is reads data from INIC's direct register communication interface
+ */
+static inline int drci_rd_reg(struct usb_device *dev, u16 reg, u16 *buf)
+{
+ int retval;
+ __le16 *dma_buf = kzalloc(sizeof(*dma_buf), GFP_KERNEL);
+ u8 req_type = USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
+
+ if (!dma_buf)
+ return -ENOMEM;
+
+ retval = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+ DRCI_READ_REQ, req_type,
+ 0x0000,
+ reg, dma_buf, sizeof(*dma_buf), 5 * HZ);
+ *buf = le16_to_cpu(*dma_buf);
+ kfree(dma_buf);
+
+ return retval;
+}
+
+/**
+ * drci_wr_reg - write a DCI register
+ * @dev: usb device
+ * @reg: register address
+ * @data: data to write
+ *
+ * This is writes data to INIC's direct register communication interface
+ */
+static inline int drci_wr_reg(struct usb_device *dev, u16 reg, u16 data)
+{
+ return usb_control_msg(dev,
+ usb_sndctrlpipe(dev, 0),
+ DRCI_WRITE_REQ,
+ USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ data,
+ reg,
+ NULL,
+ 0,
+ 5 * HZ);
+}
+
+static inline int start_sync_ep(struct usb_device *usb_dev, u16 ep)
+{
+ return drci_wr_reg(usb_dev, DRCI_REG_BASE + DRCI_COMMAND + ep * 16, 1);
+}
+
+/**
+ * get_stream_frame_size - calculate frame size of current configuration
+ * @cfg: channel configuration
+ */
+static unsigned int get_stream_frame_size(struct most_channel_config *cfg)
+{
+ unsigned int frame_size = 0;
+ unsigned int sub_size = cfg->subbuffer_size;
+
+ if (!sub_size) {
+ pr_warn("Misconfig: Subbuffer size zero.\n");
+ return frame_size;
+ }
+ switch (cfg->data_type) {
+ case MOST_CH_ISOC:
+ frame_size = AV_PACKETS_PER_XACT * sub_size;
+ break;
+ case MOST_CH_SYNC:
+ if (cfg->packets_per_xact == 0) {
+ pr_warn("Misconfig: Packets per XACT zero\n");
+ frame_size = 0;
+ } else if (cfg->packets_per_xact == 0xFF) {
+ frame_size = (USB_MTU / sub_size) * sub_size;
+ } else {
+ frame_size = cfg->packets_per_xact * sub_size;
+ }
+ break;
+ default:
+ pr_warn("Query frame size of non-streaming channel\n");
+ break;
+ }
+ return frame_size;
+}
+
+/**
+ * hdm_poison_channel - mark buffers of this channel as invalid
+ * @iface: pointer to the interface
+ * @channel: channel ID
+ *
+ * This unlinks all URBs submitted to the HCD,
+ * calls the associated completion function of the core and removes
+ * them from the list.
+ *
+ * Returns 0 on success or error code otherwise.
+ */
+static int hdm_poison_channel(struct most_interface *iface, int channel)
+{
+ struct most_dev *mdev = to_mdev(iface);
+ unsigned long flags;
+ spinlock_t *lock; /* temp. lock */
+
+ if (unlikely(!iface)) {
+ dev_warn(&mdev->usb_device->dev, "Poison: Bad interface.\n");
+ return -EIO;
+ }
+ if (unlikely(channel < 0 || channel >= iface->num_channels)) {
+ dev_warn(&mdev->usb_device->dev, "Channel ID out of range.\n");
+ return -ECHRNG;
+ }
+
+ lock = mdev->channel_lock + channel;
+ spin_lock_irqsave(lock, flags);
+ mdev->is_channel_healthy[channel] = false;
+ spin_unlock_irqrestore(lock, flags);
+
+ cancel_work_sync(&mdev->clear_work[channel].ws);
+
+ mutex_lock(&mdev->io_mutex);
+ usb_kill_anchored_urbs(&mdev->busy_urbs[channel]);
+ if (mdev->padding_active[channel])
+ mdev->padding_active[channel] = false;
+
+ if (mdev->conf[channel].data_type == MOST_CH_ASYNC) {
+ del_timer_sync(&mdev->link_stat_timer);
+ cancel_work_sync(&mdev->poll_work_obj);
+ }
+ mutex_unlock(&mdev->io_mutex);
+ return 0;
+}
+
+/**
+ * hdm_add_padding - add padding bytes
+ * @mdev: most device
+ * @channel: channel ID
+ * @mbo: buffer object
+ *
+ * This inserts the INIC hardware specific padding bytes into a streaming
+ * channel's buffer
+ */
+static int hdm_add_padding(struct most_dev *mdev, int channel, struct mbo *mbo)
+{
+ struct most_channel_config *conf = &mdev->conf[channel];
+ unsigned int frame_size = get_stream_frame_size(conf);
+ unsigned int j, num_frames;
+
+ if (!frame_size)
+ return -EIO;
+ num_frames = mbo->buffer_length / frame_size;
+
+ if (num_frames < 1) {
+ dev_err(&mdev->usb_device->dev,
+ "Missed minimal transfer unit.\n");
+ return -EIO;
+ }
+
+ for (j = num_frames - 1; j > 0; j--)
+ memmove(mbo->virt_address + j * USB_MTU,
+ mbo->virt_address + j * frame_size,
+ frame_size);
+ mbo->buffer_length = num_frames * USB_MTU;
+ return 0;
+}
+
+/**
+ * hdm_remove_padding - remove padding bytes
+ * @mdev: most device
+ * @channel: channel ID
+ * @mbo: buffer object
+ *
+ * This takes the INIC hardware specific padding bytes off a streaming
+ * channel's buffer.
+ */
+static int hdm_remove_padding(struct most_dev *mdev, int channel,
+ struct mbo *mbo)
+{
+ struct most_channel_config *const conf = &mdev->conf[channel];
+ unsigned int frame_size = get_stream_frame_size(conf);
+ unsigned int j, num_frames;
+
+ if (!frame_size)
+ return -EIO;
+ num_frames = mbo->processed_length / USB_MTU;
+
+ for (j = 1; j < num_frames; j++)
+ memmove(mbo->virt_address + frame_size * j,
+ mbo->virt_address + USB_MTU * j,
+ frame_size);
+
+ mbo->processed_length = frame_size * num_frames;
+ return 0;
+}
+
+/**
+ * hdm_write_completion - completion function for submitted Tx URBs
+ * @urb: the URB that has been completed
+ *
+ * This checks the status of the completed URB. In case the URB has been
+ * unlinked before, it is immediately freed. On any other error the MBO
+ * transfer flag is set. On success it frees allocated resources and calls
+ * the completion function.
+ *
+ * Context: interrupt!
+ */
+static void hdm_write_completion(struct urb *urb)
+{
+ struct mbo *mbo = urb->context;
+ struct most_dev *mdev = to_mdev(mbo->ifp);
+ unsigned int channel = mbo->hdm_channel_id;
+ struct device *dev = &mdev->usb_device->dev;
+ spinlock_t *lock = mdev->channel_lock + channel;
+ unsigned long flags;
+
+ spin_lock_irqsave(lock, flags);
+
+ mbo->processed_length = 0;
+ mbo->status = MBO_E_INVAL;
+ if (likely(mdev->is_channel_healthy[channel])) {
+ switch (urb->status) {
+ case 0:
+ case -ESHUTDOWN:
+ mbo->processed_length = urb->actual_length;
+ mbo->status = MBO_SUCCESS;
+ break;
+ case -EPIPE:
+ dev_warn(dev, "Broken OUT pipe detected\n");
+ mdev->is_channel_healthy[channel] = false;
+ mdev->clear_work[channel].pipe = urb->pipe;
+ schedule_work(&mdev->clear_work[channel].ws);
+ break;
+ case -ENODEV:
+ case -EPROTO:
+ mbo->status = MBO_E_CLOSE;
+ break;
+ }
+ }
+
+ spin_unlock_irqrestore(lock, flags);
+
+ if (likely(mbo->complete))
+ mbo->complete(mbo);
+ usb_free_urb(urb);
+}
+
+/**
+ * hdm_read_completion - completion function for submitted Rx URBs
+ * @urb: the URB that has been completed
+ *
+ * This checks the status of the completed URB. In case the URB has been
+ * unlinked before it is immediately freed. On any other error the MBO transfer
+ * flag is set. On success it frees allocated resources, removes
+ * padding bytes -if necessary- and calls the completion function.
+ *
+ * Context: interrupt!
+ *
+ * **************************************************************************
+ * Error codes returned by in urb->status
+ * or in iso_frame_desc[n].status (for ISO)
+ * *************************************************************************
+ *
+ * USB device drivers may only test urb status values in completion handlers.
+ * This is because otherwise there would be a race between HCDs updating
+ * these values on one CPU, and device drivers testing them on another CPU.
+ *
+ * A transfer's actual_length may be positive even when an error has been
+ * reported. That's because transfers often involve several packets, so that
+ * one or more packets could finish before an error stops further endpoint I/O.
+ *
+ * For isochronous URBs, the urb status value is non-zero only if the URB is
+ * unlinked, the device is removed, the host controller is disabled or the total
+ * transferred length is less than the requested length and the URB_SHORT_NOT_OK
+ * flag is set. Completion handlers for isochronous URBs should only see
+ * urb->status set to zero, -ENOENT, -ECONNRESET, -ESHUTDOWN, or -EREMOTEIO.
+ * Individual frame descriptor status fields may report more status codes.
+ *
+ *
+ * 0 Transfer completed successfully
+ *
+ * -ENOENT URB was synchronously unlinked by usb_unlink_urb
+ *
+ * -EINPROGRESS URB still pending, no results yet
+ * (That is, if drivers see this it's a bug.)
+ *
+ * -EPROTO (*, **) a) bitstuff error
+ * b) no response packet received within the
+ * prescribed bus turn-around time
+ * c) unknown USB error
+ *
+ * -EILSEQ (*, **) a) CRC mismatch
+ * b) no response packet received within the
+ * prescribed bus turn-around time
+ * c) unknown USB error
+ *
+ * Note that often the controller hardware does not
+ * distinguish among cases a), b), and c), so a
+ * driver cannot tell whether there was a protocol
+ * error, a failure to respond (often caused by
+ * device disconnect), or some other fault.
+ *
+ * -ETIME (**) No response packet received within the prescribed
+ * bus turn-around time. This error may instead be
+ * reported as -EPROTO or -EILSEQ.
+ *
+ * -ETIMEDOUT Synchronous USB message functions use this code
+ * to indicate timeout expired before the transfer
+ * completed, and no other error was reported by HC.
+ *
+ * -EPIPE (**) Endpoint stalled. For non-control endpoints,
+ * reset this status with usb_clear_halt().
+ *
+ * -ECOMM During an IN transfer, the host controller
+ * received data from an endpoint faster than it
+ * could be written to system memory
+ *
+ * -ENOSR During an OUT transfer, the host controller
+ * could not retrieve data from system memory fast
+ * enough to keep up with the USB data rate
+ *
+ * -EOVERFLOW (*) The amount of data returned by the endpoint was
+ * greater than either the max packet size of the
+ * endpoint or the remaining buffer size. "Babble".
+ *
+ * -EREMOTEIO The data read from the endpoint did not fill the
+ * specified buffer, and URB_SHORT_NOT_OK was set in
+ * urb->transfer_flags.
+ *
+ * -ENODEV Device was removed. Often preceded by a burst of
+ * other errors, since the hub driver doesn't detect
+ * device removal events immediately.
+ *
+ * -EXDEV ISO transfer only partially completed
+ * (only set in iso_frame_desc[n].status, not urb->status)
+ *
+ * -EINVAL ISO madness, if this happens: Log off and go home
+ *
+ * -ECONNRESET URB was asynchronously unlinked by usb_unlink_urb
+ *
+ * -ESHUTDOWN The device or host controller has been disabled due
+ * to some problem that could not be worked around,
+ * such as a physical disconnect.
+ *
+ *
+ * (*) Error codes like -EPROTO, -EILSEQ and -EOVERFLOW normally indicate
+ * hardware problems such as bad devices (including firmware) or cables.
+ *
+ * (**) This is also one of several codes that different kinds of host
+ * controller use to indicate a transfer has failed because of device
+ * disconnect. In the interval before the hub driver starts disconnect
+ * processing, devices may receive such fault reports for every request.
+ *
+ * See <https://www.kernel.org/doc/Documentation/driver-api/usb/error-codes.rst>
+ */
+static void hdm_read_completion(struct urb *urb)
+{
+ struct mbo *mbo = urb->context;
+ struct most_dev *mdev = to_mdev(mbo->ifp);
+ unsigned int channel = mbo->hdm_channel_id;
+ struct device *dev = &mdev->usb_device->dev;
+ spinlock_t *lock = mdev->channel_lock + channel;
+ unsigned long flags;
+
+ spin_lock_irqsave(lock, flags);
+
+ mbo->processed_length = 0;
+ mbo->status = MBO_E_INVAL;
+ if (likely(mdev->is_channel_healthy[channel])) {
+ switch (urb->status) {
+ case 0:
+ case -ESHUTDOWN:
+ mbo->processed_length = urb->actual_length;
+ mbo->status = MBO_SUCCESS;
+ if (mdev->padding_active[channel] &&
+ hdm_remove_padding(mdev, channel, mbo)) {
+ mbo->processed_length = 0;
+ mbo->status = MBO_E_INVAL;
+ }
+ break;
+ case -EPIPE:
+ dev_warn(dev, "Broken IN pipe detected\n");
+ mdev->is_channel_healthy[channel] = false;
+ mdev->clear_work[channel].pipe = urb->pipe;
+ schedule_work(&mdev->clear_work[channel].ws);
+ break;
+ case -ENODEV:
+ case -EPROTO:
+ mbo->status = MBO_E_CLOSE;
+ break;
+ case -EOVERFLOW:
+ dev_warn(dev, "Babble on IN pipe detected\n");
+ break;
+ }
+ }
+
+ spin_unlock_irqrestore(lock, flags);
+
+ if (likely(mbo->complete))
+ mbo->complete(mbo);
+ usb_free_urb(urb);
+}
+
+/**
+ * hdm_enqueue - receive a buffer to be used for data transfer
+ * @iface: interface to enqueue to
+ * @channel: ID of the channel
+ * @mbo: pointer to the buffer object
+ *
+ * This allocates a new URB and fills it according to the channel
+ * that is being used for transmission of data. Before the URB is
+ * submitted it is stored in the private anchor list.
+ *
+ * Returns 0 on success. On any error the URB is freed and a error code
+ * is returned.
+ *
+ * Context: Could in _some_ cases be interrupt!
+ */
+static int hdm_enqueue(struct most_interface *iface, int channel,
+ struct mbo *mbo)
+{
+ struct most_dev *mdev;
+ struct most_channel_config *conf;
+ struct device *dev;
+ int retval = 0;
+ struct urb *urb;
+ unsigned long length;
+ void *virt_address;
+
+ if (unlikely(!iface || !mbo))
+ return -EIO;
+ if (unlikely(iface->num_channels <= channel || channel < 0))
+ return -ECHRNG;
+
+ mdev = to_mdev(iface);
+ conf = &mdev->conf[channel];
+ dev = &mdev->usb_device->dev;
+
+ if (!mdev->usb_device)
+ return -ENODEV;
+
+ urb = usb_alloc_urb(NO_ISOCHRONOUS_URB, GFP_ATOMIC);
+ if (!urb)
+ return -ENOMEM;
+
+ if ((conf->direction & MOST_CH_TX) && mdev->padding_active[channel] &&
+ hdm_add_padding(mdev, channel, mbo)) {
+ retval = -EIO;
+ goto _error;
+ }
+
+ urb->transfer_dma = mbo->bus_address;
+ virt_address = mbo->virt_address;
+ length = mbo->buffer_length;
+
+ if (conf->direction & MOST_CH_TX) {
+ usb_fill_bulk_urb(urb, mdev->usb_device,
+ usb_sndbulkpipe(mdev->usb_device,
+ mdev->ep_address[channel]),
+ virt_address,
+ length,
+ hdm_write_completion,
+ mbo);
+ if (conf->data_type != MOST_CH_ISOC)
+ urb->transfer_flags |= URB_ZERO_PACKET;
+ } else {
+ usb_fill_bulk_urb(urb, mdev->usb_device,
+ usb_rcvbulkpipe(mdev->usb_device,
+ mdev->ep_address[channel]),
+ virt_address,
+ length + conf->extra_len,
+ hdm_read_completion,
+ mbo);
+ }
+ urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+ usb_anchor_urb(urb, &mdev->busy_urbs[channel]);
+
+ retval = usb_submit_urb(urb, GFP_KERNEL);
+ if (retval) {
+ dev_err(dev, "URB submit failed with error %d.\n", retval);
+ goto _error_1;
+ }
+ return 0;
+
+_error_1:
+ usb_unanchor_urb(urb);
+_error:
+ usb_free_urb(urb);
+ return retval;
+}
+
+/**
+ * hdm_configure_channel - receive channel configuration from core
+ * @iface: interface
+ * @channel: channel ID
+ * @conf: structure that holds the configuration information
+ *
+ * The attached network interface controller (NIC) supports a padding mode
+ * to avoid short packets on USB, hence increasing the performance due to a
+ * lower interrupt load. This mode is default for synchronous data and can
+ * be switched on for isochronous data. In case padding is active the
+ * driver needs to know the frame size of the payload in order to calculate
+ * the number of bytes it needs to pad when transmitting or to cut off when
+ * receiving data.
+ *
+ */
+static int hdm_configure_channel(struct most_interface *iface, int channel,
+ struct most_channel_config *conf)
+{
+ unsigned int num_frames;
+ unsigned int frame_size;
+ struct most_dev *mdev = to_mdev(iface);
+ struct device *dev = &mdev->usb_device->dev;
+
+ mdev->is_channel_healthy[channel] = true;
+ mdev->clear_work[channel].channel = channel;
+ mdev->clear_work[channel].mdev = mdev;
+ INIT_WORK(&mdev->clear_work[channel].ws, wq_clear_halt);
+
+ if (unlikely(!iface || !conf)) {
+ dev_err(dev, "Bad interface or config pointer.\n");
+ return -EINVAL;
+ }
+ if (unlikely(channel < 0 || channel >= iface->num_channels)) {
+ dev_err(dev, "Channel ID out of range.\n");
+ return -EINVAL;
+ }
+ if (!conf->num_buffers || !conf->buffer_size) {
+ dev_err(dev, "Misconfig: buffer size or #buffers zero.\n");
+ return -EINVAL;
+ }
+
+ if (conf->data_type != MOST_CH_SYNC &&
+ !(conf->data_type == MOST_CH_ISOC &&
+ conf->packets_per_xact != 0xFF)) {
+ mdev->padding_active[channel] = false;
+ /*
+ * Since the NIC's padding mode is not going to be
+ * used, we can skip the frame size calculations and
+ * move directly on to exit.
+ */
+ goto exit;
+ }
+
+ mdev->padding_active[channel] = true;
+
+ frame_size = get_stream_frame_size(conf);
+ if (frame_size == 0 || frame_size > USB_MTU) {
+ dev_warn(dev, "Misconfig: frame size wrong\n");
+ return -EINVAL;
+ }
+
+ num_frames = conf->buffer_size / frame_size;
+
+ if (conf->buffer_size % frame_size) {
+ u16 old_size = conf->buffer_size;
+
+ conf->buffer_size = num_frames * frame_size;
+ dev_warn(dev, "%s: fixed buffer size (%d -> %d)\n",
+ mdev->suffix[channel], old_size, conf->buffer_size);
+ }
+
+ /* calculate extra length to comply w/ HW padding */
+ conf->extra_len = num_frames * (USB_MTU - frame_size);
+
+exit:
+ mdev->conf[channel] = *conf;
+ if (conf->data_type == MOST_CH_ASYNC) {
+ u16 ep = mdev->ep_address[channel];
+
+ if (start_sync_ep(mdev->usb_device, ep) < 0)
+ dev_warn(dev, "sync for ep%02x failed", ep);
+ }
+ return 0;
+}
+
+/**
+ * hdm_request_netinfo - request network information
+ * @iface: pointer to interface
+ * @channel: channel ID
+ *
+ * This is used as trigger to set up the link status timer that
+ * polls for the NI state of the INIC every 2 seconds.
+ *
+ */
+static void hdm_request_netinfo(struct most_interface *iface, int channel,
+ void (*on_netinfo)(struct most_interface *,
+ unsigned char,
+ unsigned char *))
+{
+ struct most_dev *mdev;
+
+ BUG_ON(!iface);
+ mdev = to_mdev(iface);
+ mdev->on_netinfo = on_netinfo;
+ if (!on_netinfo)
+ return;
+
+ mdev->link_stat_timer.expires = jiffies + HZ;
+ mod_timer(&mdev->link_stat_timer, mdev->link_stat_timer.expires);
+}
+
+/**
+ * link_stat_timer_handler - schedule work obtaining mac address and link status
+ * @data: pointer to USB device instance
+ *
+ * The handler runs in interrupt context. That's why we need to defer the
+ * tasks to a work queue.
+ */
+static void link_stat_timer_handler(struct timer_list *t)
+{
+ struct most_dev *mdev = from_timer(mdev, t, link_stat_timer);
+
+ schedule_work(&mdev->poll_work_obj);
+ mdev->link_stat_timer.expires = jiffies + (2 * HZ);
+ add_timer(&mdev->link_stat_timer);
+}
+
+/**
+ * wq_netinfo - work queue function to deliver latest networking information
+ * @wq_obj: object that holds data for our deferred work to do
+ *
+ * This retrieves the network interface status of the USB INIC
+ */
+static void wq_netinfo(struct work_struct *wq_obj)
+{
+ struct most_dev *mdev = to_mdev_from_work(wq_obj);
+ struct usb_device *usb_device = mdev->usb_device;
+ struct device *dev = &usb_device->dev;
+ u16 hi, mi, lo, link;
+ u8 hw_addr[6];
+
+ if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_HI, &hi) < 0) {
+ dev_err(dev, "Vendor request 'hw_addr_hi' failed\n");
+ return;
+ }
+
+ if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_MI, &mi) < 0) {
+ dev_err(dev, "Vendor request 'hw_addr_mid' failed\n");
+ return;
+ }
+
+ if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_LO, &lo) < 0) {
+ dev_err(dev, "Vendor request 'hw_addr_low' failed\n");
+ return;
+ }
+
+ if (drci_rd_reg(usb_device, DRCI_REG_NI_STATE, &link) < 0) {
+ dev_err(dev, "Vendor request 'link status' failed\n");
+ return;
+ }
+
+ hw_addr[0] = hi >> 8;
+ hw_addr[1] = hi;
+ hw_addr[2] = mi >> 8;
+ hw_addr[3] = mi;
+ hw_addr[4] = lo >> 8;
+ hw_addr[5] = lo;
+
+ if (mdev->on_netinfo)
+ mdev->on_netinfo(&mdev->iface, link, hw_addr);
+}
+
+/**
+ * wq_clear_halt - work queue function
+ * @wq_obj: work_struct object to execute
+ *
+ * This sends a clear_halt to the given USB pipe.
+ */
+static void wq_clear_halt(struct work_struct *wq_obj)
+{
+ struct clear_hold_work *clear_work = to_clear_hold_work(wq_obj);
+ struct most_dev *mdev = clear_work->mdev;
+ unsigned int channel = clear_work->channel;
+ int pipe = clear_work->pipe;
+
+ mutex_lock(&mdev->io_mutex);
+ most_stop_enqueue(&mdev->iface, channel);
+ usb_kill_anchored_urbs(&mdev->busy_urbs[channel]);
+ if (usb_clear_halt(mdev->usb_device, pipe))
+ dev_warn(&mdev->usb_device->dev, "Failed to reset endpoint.\n");
+
+ mdev->is_channel_healthy[channel] = true;
+ most_resume_enqueue(&mdev->iface, channel);
+ mutex_unlock(&mdev->io_mutex);
+}
+
+/**
+ * hdm_usb_fops - file operation table for USB driver
+ */
+static const struct file_operations hdm_usb_fops = {
+ .owner = THIS_MODULE,
+};
+
+/**
+ * usb_device_id - ID table for HCD device probing
+ */
+static const struct usb_device_id usbid[] = {
+ { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_BRDG), },
+ { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81118), },
+ { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81119), },
+ { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81210), },
+ { } /* Terminating entry */
+};
+
+#define MOST_DCI_RO_ATTR(_name) \
+ struct most_dci_attribute most_dci_attr_##_name = \
+ __ATTR(_name, 0444, show_value, NULL)
+
+#define MOST_DCI_ATTR(_name) \
+ struct most_dci_attribute most_dci_attr_##_name = \
+ __ATTR(_name, 0644, show_value, store_value)
+
+#define MOST_DCI_WO_ATTR(_name) \
+ struct most_dci_attribute most_dci_attr_##_name = \
+ __ATTR(_name, 0200, NULL, store_value)
+
+/**
+ * struct most_dci_attribute - to access the attributes of a dci object
+ * @attr: attributes of a dci object
+ * @show: pointer to the show function
+ * @store: pointer to the store function
+ */
+struct most_dci_attribute {
+ struct attribute attr;
+ ssize_t (*show)(struct most_dci_obj *d,
+ struct most_dci_attribute *attr,
+ char *buf);
+ ssize_t (*store)(struct most_dci_obj *d,
+ struct most_dci_attribute *attr,
+ const char *buf,
+ size_t count);
+};
+
+#define to_dci_attr(a) container_of(a, struct most_dci_attribute, attr)
+
+/**
+ * dci_attr_show - show function for dci object
+ * @kobj: pointer to kobject
+ * @attr: pointer to attribute struct
+ * @buf: buffer
+ */
+static ssize_t dci_attr_show(struct kobject *kobj, struct attribute *attr,
+ char *buf)
+{
+ struct most_dci_attribute *dci_attr = to_dci_attr(attr);
+ struct most_dci_obj *dci_obj = to_dci_obj(kobj);
+
+ if (!dci_attr->show)
+ return -EIO;
+
+ return dci_attr->show(dci_obj, dci_attr, buf);
+}
+
+/**
+ * dci_attr_store - store function for dci object
+ * @kobj: pointer to kobject
+ * @attr: pointer to attribute struct
+ * @buf: buffer
+ * @len: length of buffer
+ */
+static ssize_t dci_attr_store(struct kobject *kobj,
+ struct attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct most_dci_attribute *dci_attr = to_dci_attr(attr);
+ struct most_dci_obj *dci_obj = to_dci_obj(kobj);
+
+ if (!dci_attr->store)
+ return -EIO;
+
+ return dci_attr->store(dci_obj, dci_attr, buf, len);
+}
+
+static const struct sysfs_ops most_dci_sysfs_ops = {
+ .show = dci_attr_show,
+ .store = dci_attr_store,
+};
+
+/**
+ * most_dci_release - release function for dci object
+ * @kobj: pointer to kobject
+ *
+ * This frees the memory allocated for the dci object
+ */
+static void most_dci_release(struct kobject *kobj)
+{
+ struct most_dci_obj *dci_obj = to_dci_obj(kobj);
+
+ kfree(dci_obj);
+}
+
+struct regs {
+ const char *name;
+ u16 reg;
+};
+
+static const struct regs ro_regs[] = {
+ { "ni_state", DRCI_REG_NI_STATE },
+ { "packet_bandwidth", DRCI_REG_PACKET_BW },
+ { "node_address", DRCI_REG_NODE_ADDR },
+ { "node_position", DRCI_REG_NODE_POS },
+};
+
+static const struct regs rw_regs[] = {
+ { "mep_filter", DRCI_REG_MEP_FILTER },
+ { "mep_hash0", DRCI_REG_HASH_TBL0 },
+ { "mep_hash1", DRCI_REG_HASH_TBL1 },
+ { "mep_hash2", DRCI_REG_HASH_TBL2 },
+ { "mep_hash3", DRCI_REG_HASH_TBL3 },
+ { "mep_eui48_hi", DRCI_REG_HW_ADDR_HI },
+ { "mep_eui48_mi", DRCI_REG_HW_ADDR_MI },
+ { "mep_eui48_lo", DRCI_REG_HW_ADDR_LO },
+};
+
+static int get_stat_reg_addr(const struct regs *regs, int size,
+ const char *name, u16 *reg_addr)
+{
+ int i;
+
+ for (i = 0; i < size; i++) {
+ if (!strcmp(name, regs[i].name)) {
+ *reg_addr = regs[i].reg;
+ return 0;
+ }
+ }
+ return -EFAULT;
+}
+
+#define get_static_reg_addr(regs, name, reg_addr) \
+ get_stat_reg_addr(regs, ARRAY_SIZE(regs), name, reg_addr)
+
+static ssize_t show_value(struct most_dci_obj *dci_obj,
+ struct most_dci_attribute *attr, char *buf)
+{
+ const char *name = attr->attr.name;
+ u16 val;
+ u16 reg_addr;
+ int err;
+
+ if (!strcmp(name, "arb_address"))
+ return snprintf(buf, PAGE_SIZE, "%04x\n", dci_obj->reg_addr);
+
+ if (!strcmp(name, "arb_value"))
+ reg_addr = dci_obj->reg_addr;
+ else if (get_static_reg_addr(ro_regs, name, ®_addr) &&
+ get_static_reg_addr(rw_regs, name, ®_addr))
+ return -EFAULT;
+
+ err = drci_rd_reg(dci_obj->usb_device, reg_addr, &val);
+ if (err < 0)
+ return err;
+
+ return snprintf(buf, PAGE_SIZE, "%04x\n", val);
+}
+
+static ssize_t store_value(struct most_dci_obj *dci_obj,
+ struct most_dci_attribute *attr,
+ const char *buf, size_t count)
+{
+ u16 val;
+ u16 reg_addr;
+ const char *name = attr->attr.name;
+ struct usb_device *usb_dev = dci_obj->usb_device;
+ int err = kstrtou16(buf, 16, &val);
+
+ if (err)
+ return err;
+
+ if (!strcmp(name, "arb_address")) {
+ dci_obj->reg_addr = val;
+ return count;
+ }
+
+ if (!strcmp(name, "arb_value"))
+ err = drci_wr_reg(usb_dev, dci_obj->reg_addr, val);
+ else if (!strcmp(name, "sync_ep"))
+ err = start_sync_ep(usb_dev, val);
+ else if (!get_static_reg_addr(rw_regs, name, ®_addr))
+ err = drci_wr_reg(usb_dev, reg_addr, val);
+ else
+ return -EFAULT;
+
+ if (err < 0)
+ return err;
+
+ return count;
+}
+
+static MOST_DCI_RO_ATTR(ni_state);
+static MOST_DCI_RO_ATTR(packet_bandwidth);
+static MOST_DCI_RO_ATTR(node_address);
+static MOST_DCI_RO_ATTR(node_position);
+static MOST_DCI_WO_ATTR(sync_ep);
+static MOST_DCI_ATTR(mep_filter);
+static MOST_DCI_ATTR(mep_hash0);
+static MOST_DCI_ATTR(mep_hash1);
+static MOST_DCI_ATTR(mep_hash2);
+static MOST_DCI_ATTR(mep_hash3);
+static MOST_DCI_ATTR(mep_eui48_hi);
+static MOST_DCI_ATTR(mep_eui48_mi);
+static MOST_DCI_ATTR(mep_eui48_lo);
+static MOST_DCI_ATTR(arb_address);
+static MOST_DCI_ATTR(arb_value);
+
+/**
+ * most_dci_def_attrs - array of default attribute files of the dci object
+ */
+static struct attribute *most_dci_def_attrs[] = {
+ &most_dci_attr_ni_state.attr,
+ &most_dci_attr_packet_bandwidth.attr,
+ &most_dci_attr_node_address.attr,
+ &most_dci_attr_node_position.attr,
+ &most_dci_attr_sync_ep.attr,
+ &most_dci_attr_mep_filter.attr,
+ &most_dci_attr_mep_hash0.attr,
+ &most_dci_attr_mep_hash1.attr,
+ &most_dci_attr_mep_hash2.attr,
+ &most_dci_attr_mep_hash3.attr,
+ &most_dci_attr_mep_eui48_hi.attr,
+ &most_dci_attr_mep_eui48_mi.attr,
+ &most_dci_attr_mep_eui48_lo.attr,
+ &most_dci_attr_arb_address.attr,
+ &most_dci_attr_arb_value.attr,
+ NULL,
+};
+
+/**
+ * DCI ktype
+ */
+static struct kobj_type most_dci_ktype = {
+ .sysfs_ops = &most_dci_sysfs_ops,
+ .release = most_dci_release,
+ .default_attrs = most_dci_def_attrs,
+};
+
+/**
+ * create_most_dci_obj - allocates a dci object
+ * @parent: parent kobject
+ *
+ * This creates a dci object and registers it with sysfs.
+ * Returns a pointer to the object or NULL when something went wrong.
+ */
+static struct
+most_dci_obj *create_most_dci_obj(struct kobject *parent)
+{
+ struct most_dci_obj *most_dci = kzalloc(sizeof(*most_dci), GFP_KERNEL);
+ int retval;
+
+ if (!most_dci)
+ return NULL;
+
+ retval = kobject_init_and_add(&most_dci->kobj, &most_dci_ktype, parent,
+ "dci");
+ if (retval) {
+ kobject_put(&most_dci->kobj);
+ return NULL;
+ }
+ return most_dci;
+}
+
+/**
+ * destroy_most_dci_obj - DCI object release function
+ * @p: pointer to dci object
+ */
+static void destroy_most_dci_obj(struct most_dci_obj *p)
+{
+ kobject_put(&p->kobj);
+}
+
+/**
+ * hdm_probe - probe function of USB device driver
+ * @interface: Interface of the attached USB device
+ * @id: Pointer to the USB ID table.
+ *
+ * This allocates and initializes the device instance, adds the new
+ * entry to the internal list, scans the USB descriptors and registers
+ * the interface with the core.
+ * Additionally, the DCI objects are created and the hardware is sync'd.
+ *
+ * Return 0 on success. In case of an error a negative number is returned.
+ */
+static int
+hdm_probe(struct usb_interface *interface, const struct usb_device_id *id)
+{
+ struct usb_host_interface *usb_iface_desc = interface->cur_altsetting;
+ struct usb_device *usb_dev = interface_to_usbdev(interface);
+ struct device *dev = &usb_dev->dev;
+ struct most_dev *mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
+ unsigned int i;
+ unsigned int num_endpoints;
+ struct most_channel_capability *tmp_cap;
+ struct usb_endpoint_descriptor *ep_desc;
+ int ret = 0;
+
+ if (!mdev)
+ goto exit_ENOMEM;
+
+ usb_set_intfdata(interface, mdev);
+ num_endpoints = usb_iface_desc->desc.bNumEndpoints;
+ mutex_init(&mdev->io_mutex);
+ INIT_WORK(&mdev->poll_work_obj, wq_netinfo);
+ timer_setup(&mdev->link_stat_timer, link_stat_timer_handler, 0);
+
+ mdev->usb_device = usb_dev;
+ mdev->link_stat_timer.expires = jiffies + (2 * HZ);
+
+ mdev->iface.mod = hdm_usb_fops.owner;
+ mdev->iface.interface = ITYPE_USB;
+ mdev->iface.configure = hdm_configure_channel;
+ mdev->iface.request_netinfo = hdm_request_netinfo;
+ mdev->iface.enqueue = hdm_enqueue;
+ mdev->iface.poison_channel = hdm_poison_channel;
+ mdev->iface.description = mdev->description;
+ mdev->iface.num_channels = num_endpoints;
+
+ snprintf(mdev->description, sizeof(mdev->description),
+ "usb_device %d-%s:%d.%d",
+ usb_dev->bus->busnum,
+ usb_dev->devpath,
+ usb_dev->config->desc.bConfigurationValue,
+ usb_iface_desc->desc.bInterfaceNumber);
+
+ mdev->conf = kcalloc(num_endpoints, sizeof(*mdev->conf), GFP_KERNEL);
+ if (!mdev->conf)
+ goto exit_free;
+
+ mdev->cap = kcalloc(num_endpoints, sizeof(*mdev->cap), GFP_KERNEL);
+ if (!mdev->cap)
+ goto exit_free1;
+
+ mdev->iface.channel_vector = mdev->cap;
+ mdev->iface.priv = NULL;
+
+ mdev->ep_address =
+ kcalloc(num_endpoints, sizeof(*mdev->ep_address), GFP_KERNEL);
+ if (!mdev->ep_address)
+ goto exit_free2;
+
+ mdev->busy_urbs =
+ kcalloc(num_endpoints, sizeof(*mdev->busy_urbs), GFP_KERNEL);
+ if (!mdev->busy_urbs)
+ goto exit_free3;
+
+ tmp_cap = mdev->cap;
+ for (i = 0; i < num_endpoints; i++) {
+ ep_desc = &usb_iface_desc->endpoint[i].desc;
+ mdev->ep_address[i] = ep_desc->bEndpointAddress;
+ mdev->padding_active[i] = false;
+ mdev->is_channel_healthy[i] = true;
+
+ snprintf(&mdev->suffix[i][0], MAX_SUFFIX_LEN, "ep%02x",
+ mdev->ep_address[i]);
+
+ tmp_cap->name_suffix = &mdev->suffix[i][0];
+ tmp_cap->buffer_size_packet = MAX_BUF_SIZE;
+ tmp_cap->buffer_size_streaming = MAX_BUF_SIZE;
+ tmp_cap->num_buffers_packet = BUF_CHAIN_SIZE;
+ tmp_cap->num_buffers_streaming = BUF_CHAIN_SIZE;
+ tmp_cap->data_type = MOST_CH_CONTROL | MOST_CH_ASYNC |
+ MOST_CH_ISOC | MOST_CH_SYNC;
+ if (usb_endpoint_dir_in(ep_desc))
+ tmp_cap->direction = MOST_CH_RX;
+ else
+ tmp_cap->direction = MOST_CH_TX;
+ tmp_cap++;
+ init_usb_anchor(&mdev->busy_urbs[i]);
+ spin_lock_init(&mdev->channel_lock[i]);
+ }
+ dev_notice(dev, "claimed gadget: Vendor=%4.4x ProdID=%4.4x Bus=%02x Device=%02x\n",
+ le16_to_cpu(usb_dev->descriptor.idVendor),
+ le16_to_cpu(usb_dev->descriptor.idProduct),
+ usb_dev->bus->busnum,
+ usb_dev->devnum);
+
+ dev_notice(dev, "device path: /sys/bus/usb/devices/%d-%s:%d.%d\n",
+ usb_dev->bus->busnum,
+ usb_dev->devpath,
+ usb_dev->config->desc.bConfigurationValue,
+ usb_iface_desc->desc.bInterfaceNumber);
+
+ mdev->parent = most_register_interface(&mdev->iface);
+ if (IS_ERR(mdev->parent)) {
+ ret = PTR_ERR(mdev->parent);
+ goto exit_free4;
+ }
+
+ mutex_lock(&mdev->io_mutex);
+ if (le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81118 ||
+ le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81119 ||
+ le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81210) {
+ /* this increments the reference count of the instance
+ * object of the core
+ */
+ mdev->dci = create_most_dci_obj(mdev->parent);
+ if (!mdev->dci) {
+ mutex_unlock(&mdev->io_mutex);
+ most_deregister_interface(&mdev->iface);
+ ret = -ENOMEM;
+ goto exit_free4;
+ }
+
+ kobject_uevent(&mdev->dci->kobj, KOBJ_ADD);
+ mdev->dci->usb_device = mdev->usb_device;
+ }
+ mutex_unlock(&mdev->io_mutex);
+ return 0;
+
+exit_free4:
+ kfree(mdev->busy_urbs);
+exit_free3:
+ kfree(mdev->ep_address);
+exit_free2:
+ kfree(mdev->cap);
+exit_free1:
+ kfree(mdev->conf);
+exit_free:
+ kfree(mdev);
+exit_ENOMEM:
+ if (ret == 0 || ret == -ENOMEM) {
+ ret = -ENOMEM;
+ dev_err(dev, "out of memory\n");
+ }
+ return ret;
+}
+
+/**
+ * hdm_disconnect - disconnect function of USB device driver
+ * @interface: Interface of the attached USB device
+ *
+ * This deregisters the interface with the core, removes the kernel timer
+ * and frees resources.
+ *
+ * Context: hub kernel thread
+ */
+static void hdm_disconnect(struct usb_interface *interface)
+{
+ struct most_dev *mdev = usb_get_intfdata(interface);
+
+ mutex_lock(&mdev->io_mutex);
+ usb_set_intfdata(interface, NULL);
+ mdev->usb_device = NULL;
+ mutex_unlock(&mdev->io_mutex);
+
+ del_timer_sync(&mdev->link_stat_timer);
+ cancel_work_sync(&mdev->poll_work_obj);
+
+ destroy_most_dci_obj(mdev->dci);
+ most_deregister_interface(&mdev->iface);
+
+ kfree(mdev->busy_urbs);
+ kfree(mdev->cap);
+ kfree(mdev->conf);
+ kfree(mdev->ep_address);
+ kfree(mdev);
+}
+
+static struct usb_driver hdm_usb = {
+ .name = "hdm_usb",
+ .id_table = usbid,
+ .probe = hdm_probe,
+ .disconnect = hdm_disconnect,
+};
+
+module_usb_driver(hdm_usb);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");
+MODULE_DESCRIPTION("HDM_4_USB");
projects / openwrt / staging / blogic.git / commitdiff