path: root/drivers/most/most_usb.c

// SPDX-License-Identifier: GPL-2.0
/*
 * usb.c - Hardware dependent module for USB
 *
 * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG
 */

#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 <linux/most.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 device dev;
	struct usb_device *usb_device;
	u16 reg_addr;
};

#define to_dci_obj(p) container_of(p, struct most_dci_obj, dev)

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
 * @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 device dev;
	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 *most_iface,
			   unsigned char link_state, unsigned char *addrs);
};

#define to_mdev(d) container_of(d, struct most_dev, iface)
#define to_mdev_from_dev(d) container_of(d, struct most_dev, dev)
#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;
	u8 req_type = USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE;

	dma_buf = kzalloc(sizeof(*dma_buf), GFP_KERNEL);
	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),
				 USB_CTRL_GET_TIMEOUT);
	*buf = le16_to_cpu(*dma_buf);
	kfree(dma_buf);

	if (retval < 0)
		return retval;
	return 0;
}

/**
 * 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,
			       USB_CTRL_SET_TIMEOUT);
}

static inline int start_sync_ep<