276 lines
9.1 KiB
C
276 lines
9.1 KiB
C
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/*
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* Intel Wireless WiMAX Connection 2400m
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* USB-specific i2400m driver definitions
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*
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*
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* Copyright (C) 2007-2008 Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*
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* Intel Corporation <linux-wimax@intel.com>
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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* Yanir Lubetkin <yanirx.lubetkin@intel.com>
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* - Initial implementation
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*
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*
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* This driver implements the bus-specific part of the i2400m for
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* USB. Check i2400m.h for a generic driver description.
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*
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* ARCHITECTURE
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*
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* This driver listens to notifications sent from the notification
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* endpoint (in usb-notif.c); when data is ready to read, the code in
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* there schedules a read from the device (usb-rx.c) and then passes
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* the data to the generic RX code (rx.c).
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*
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* When the generic driver needs to send data (network or control), it
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* queues up in the TX FIFO (tx.c) and that will notify the driver
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* through the i2400m->bus_tx_kick() callback
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* (usb-tx.c:i2400mu_bus_tx_kick) which will send the items in the
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* FIFO queue.
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*
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* This driver, as well, implements the USB-specific ops for the generic
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* driver to be able to setup/teardown communication with the device
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* [i2400m_bus_dev_start() and i2400m_bus_dev_stop()], reseting the
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* device [i2400m_bus_reset()] and performing firmware upload
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* [i2400m_bus_bm_cmd() and i2400_bus_bm_wait_for_ack()].
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*/
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#ifndef __I2400M_USB_H__
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#define __I2400M_USB_H__
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#include "i2400m.h"
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#include <linux/kthread.h>
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/*
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* Error Density Count: cheapo error density (over time) counter
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*
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* Originally by Reinette Chatre <reinette.chatre@intel.com>
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*
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* Embed an 'struct edc' somewhere. Each time there is a soft or
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* retryable error, call edc_inc() and check if the error top
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* watermark has been reached.
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*/
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enum {
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EDC_MAX_ERRORS = 10,
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EDC_ERROR_TIMEFRAME = HZ,
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};
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/* error density counter */
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struct edc {
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unsigned long timestart;
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u16 errorcount;
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};
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struct i2400m_endpoint_cfg {
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unsigned char bulk_out;
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unsigned char notification;
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unsigned char reset_cold;
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unsigned char bulk_in;
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};
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static inline void edc_init(struct edc *edc)
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{
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edc->timestart = jiffies;
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}
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/**
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* edc_inc - report a soft error and check if we are over the watermark
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*
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* @edc: pointer to error density counter.
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* @max_err: maximum number of errors we can accept over the timeframe
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* @timeframe: length of the timeframe (in jiffies).
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*
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* Returns: !0 1 if maximum acceptable errors per timeframe has been
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* exceeded. 0 otherwise.
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*
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* This is way to determine if the number of acceptable errors per time
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* period has been exceeded. It is not accurate as there are cases in which
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* this scheme will not work, for example if there are periodic occurrences
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* of errors that straddle updates to the start time. This scheme is
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* sufficient for our usage.
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*
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* To use, embed a 'struct edc' somewhere, initialize it with
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* edc_init() and when an error hits:
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*
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* if (do_something_fails_with_a_soft_error) {
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* if (edc_inc(&my->edc, MAX_ERRORS, MAX_TIMEFRAME))
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* Ops, hard error, do something about it
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* else
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* Retry or ignore, depending on whatever
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* }
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*/
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static inline int edc_inc(struct edc *edc, u16 max_err, u16 timeframe)
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{
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unsigned long now;
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now = jiffies;
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if (time_after(now, edc->timestart + timeframe)) {
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edc->errorcount = 1;
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edc->timestart = now;
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} else if (++edc->errorcount > max_err) {
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edc->errorcount = 0;
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edc->timestart = now;
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return 1;
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}
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return 0;
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}
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/* Host-Device interface for USB */
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enum {
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I2400M_USB_BOOT_RETRIES = 3,
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I2400MU_MAX_NOTIFICATION_LEN = 256,
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I2400MU_BLK_SIZE = 16,
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I2400MU_PL_SIZE_MAX = 0x3EFF,
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/* Device IDs */
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USB_DEVICE_ID_I6050 = 0x0186,
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USB_DEVICE_ID_I6050_2 = 0x0188,
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USB_DEVICE_ID_I6150 = 0x07d6,
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USB_DEVICE_ID_I6150_2 = 0x07d7,
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USB_DEVICE_ID_I6150_3 = 0x07d9,
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USB_DEVICE_ID_I6250 = 0x0187,
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};
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/**
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* struct i2400mu - descriptor for a USB connected i2400m
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*
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* @i2400m: bus-generic i2400m implementation; has to be first (see
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* it's documentation in i2400m.h).
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*
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* @usb_dev: pointer to our USB device
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*
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* @usb_iface: pointer to our USB interface
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*
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* @urb_edc: error density counter; used to keep a density-on-time tab
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* on how many soft (retryable or ignorable) errors we get. If we
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* go over the threshold, we consider the bus transport is failing
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* too much and reset.
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*
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* @notif_urb: URB for receiving notifications from the device.
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*
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* @tx_kthread: thread we use for data TX. We use a thread because in
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* order to do deep power saving and put the device to sleep, we
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* need to call usb_autopm_*() [blocking functions].
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*
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* @tx_wq: waitqueue for the TX kthread to sleep when there is no data
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* to be sent; when more data is available, it is woken up by
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* i2400mu_bus_tx_kick().
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*
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* @rx_kthread: thread we use for data RX. We use a thread because in
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* order to do deep power saving and put the device to sleep, we
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* need to call usb_autopm_*() [blocking functions].
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*
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* @rx_wq: waitqueue for the RX kthread to sleep when there is no data
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* to receive. When data is available, it is woken up by
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* usb-notif.c:i2400mu_notification_grok().
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*
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* @rx_pending_count: number of rx-data-ready notifications that were
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* still not handled by the RX kthread.
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*
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* @rx_size: current RX buffer size that is being used.
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*
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* @rx_size_acc: accumulator of the sizes of the previous read
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* transactions.
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*
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* @rx_size_cnt: number of read transactions accumulated in
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* @rx_size_acc.
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*
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* @do_autopm: disable(0)/enable(>0) calling the
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* usb_autopm_get/put_interface() barriers when executing
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* commands. See doc in i2400mu_suspend() for more information.
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*
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* @rx_size_auto_shrink: if true, the rx_size is shrunk
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* automatically based on the average size of the received
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* transactions. This allows the receive code to allocate smaller
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* chunks of memory and thus reduce pressure on the memory
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* allocator by not wasting so much space. By default it is
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* enabled.
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*
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* @debugfs_dentry: hookup for debugfs files.
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* These have to be in a separate directory, a child of
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* (wimax_dev->debugfs_dentry) so they can be removed when the
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* module unloads, as we don't keep each dentry.
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*/
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struct i2400mu {
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struct i2400m i2400m; /* FIRST! See doc */
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struct usb_device *usb_dev;
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struct usb_interface *usb_iface;
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struct edc urb_edc; /* Error density counter */
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struct i2400m_endpoint_cfg endpoint_cfg;
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struct urb *notif_urb;
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struct task_struct *tx_kthread;
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wait_queue_head_t tx_wq;
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struct task_struct *rx_kthread;
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wait_queue_head_t rx_wq;
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atomic_t rx_pending_count;
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size_t rx_size, rx_size_acc, rx_size_cnt;
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atomic_t do_autopm;
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u8 rx_size_auto_shrink;
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struct dentry *debugfs_dentry;
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unsigned i6050:1; /* 1 if this is a 6050 based SKU */
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};
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static inline
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void i2400mu_init(struct i2400mu *i2400mu)
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{
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i2400m_init(&i2400mu->i2400m);
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edc_init(&i2400mu->urb_edc);
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init_waitqueue_head(&i2400mu->tx_wq);
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atomic_set(&i2400mu->rx_pending_count, 0);
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init_waitqueue_head(&i2400mu->rx_wq);
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i2400mu->rx_size = PAGE_SIZE - sizeof(struct skb_shared_info);
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atomic_set(&i2400mu->do_autopm, 1);
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i2400mu->rx_size_auto_shrink = 1;
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}
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int i2400mu_notification_setup(struct i2400mu *);
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void i2400mu_notification_release(struct i2400mu *);
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int i2400mu_rx_setup(struct i2400mu *);
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void i2400mu_rx_release(struct i2400mu *);
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void i2400mu_rx_kick(struct i2400mu *);
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int i2400mu_tx_setup(struct i2400mu *);
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void i2400mu_tx_release(struct i2400mu *);
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void i2400mu_bus_tx_kick(struct i2400m *);
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ssize_t i2400mu_bus_bm_cmd_send(struct i2400m *,
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const struct i2400m_bootrom_header *, size_t,
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int);
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ssize_t i2400mu_bus_bm_wait_for_ack(struct i2400m *,
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struct i2400m_bootrom_header *, size_t);
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#endif /* #ifndef __I2400M_USB_H__ */
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