1/* 2 * Intel Wireless WiMAX Connection 2400m 3 * SDIO TX transaction backends 4 * 5 * 6 * Copyright (C) 2007-2008 Intel Corporation. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * * Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * * Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * * Neither the name of Intel Corporation nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 25 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 26 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 28 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 32 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 * 34 * 35 * Intel Corporation <linux-wimax@intel.com> 36 * Dirk Brandewie <dirk.j.brandewie@intel.com> 37 * - Initial implementation 38 * 39 * 40 * Takes the TX messages in the i2400m's driver TX FIFO and sends them 41 * to the device until there are no more. 42 * 43 * If we fail sending the message, we just drop it. There isn't much 44 * we can do at this point. Most of the traffic is network, which has 45 * recovery methods for dropped packets. 46 * 47 * The SDIO functions are not atomic, so we can't run from the context 48 * where i2400m->bus_tx_kick() [i2400ms_bus_tx_kick()] is being called 49 * (some times atomic). Thus, the actual TX work is deferred to a 50 * workqueue. 51 * 52 * ROADMAP 53 * 54 * i2400ms_bus_tx_kick() 55 * i2400ms_tx_submit() [through workqueue] 56 * 57 * i2400m_tx_setup() 58 * 59 * i2400m_tx_release() 60 */ 61#include <linux/mmc/sdio_func.h> 62#include "i2400m-sdio.h" 63 64#define D_SUBMODULE tx 65#include "sdio-debug-levels.h" 66 67 68/* 69 * Pull TX transations from the TX FIFO and send them to the device 70 * until there are no more. 71 */ 72static 73void i2400ms_tx_submit(struct work_struct *ws) 74{ 75 int result; 76 struct i2400ms *i2400ms = container_of(ws, struct i2400ms, tx_worker); 77 struct i2400m *i2400m = &i2400ms->i2400m; 78 struct sdio_func *func = i2400ms->func; 79 struct device *dev = &func->dev; 80 struct i2400m_msg_hdr *tx_msg; 81 size_t tx_msg_size; 82 83 d_fnstart(4, dev, "(i2400ms %p, i2400m %p)\n", i2400ms, i2400ms); 84 85 while (NULL != (tx_msg = i2400m_tx_msg_get(i2400m, &tx_msg_size))) { 86 d_printf(2, dev, "TX: submitting %zu bytes\n", tx_msg_size); 87 d_dump(5, dev, tx_msg, tx_msg_size); 88 89 sdio_claim_host(func); 90 result = sdio_memcpy_toio(func, 0, tx_msg, tx_msg_size); 91 sdio_release_host(func); 92 93 i2400m_tx_msg_sent(i2400m); 94 95 if (result < 0) { 96 dev_err(dev, "TX: cannot submit TX; tx_msg @%zu %zu B:" 97 " %d\n", (void *) tx_msg - i2400m->tx_buf, 98 tx_msg_size, result); 99 } 100 101 if (result == -ETIMEDOUT) { 102 i2400m_error_recovery(i2400m); 103 break; 104 } 105 d_printf(2, dev, "TX: %zub submitted\n", tx_msg_size); 106 } 107 108 d_fnend(4, dev, "(i2400ms %p) = void\n", i2400ms); 109} 110 111 112/* 113 * The generic driver notifies us that there is data ready for TX 114 * 115 * Schedule a run of i2400ms_tx_submit() to handle it. 116 */ 117void i2400ms_bus_tx_kick(struct i2400m *i2400m) 118{ 119 struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m); 120 struct device *dev = &i2400ms->func->dev; 121 unsigned long flags; 122 123 d_fnstart(3, dev, "(i2400m %p) = void\n", i2400m); 124 125 /* schedule tx work, this is because tx may block, therefore 126 * it has to run in a thread context. 127 */ 128 spin_lock_irqsave(&i2400m->tx_lock, flags); 129 if (i2400ms->tx_workqueue != NULL) 130 queue_work(i2400ms->tx_workqueue, &i2400ms->tx_worker); 131 spin_unlock_irqrestore(&i2400m->tx_lock, flags); 132 133 d_fnend(3, dev, "(i2400m %p) = void\n", i2400m); 134} 135 136int i2400ms_tx_setup(struct i2400ms *i2400ms) 137{ 138 int result; 139 struct device *dev = &i2400ms->func->dev; 140 struct i2400m *i2400m = &i2400ms->i2400m; 141 struct workqueue_struct *tx_workqueue; 142 unsigned long flags; 143 144 d_fnstart(5, dev, "(i2400ms %p)\n", i2400ms); 145 146 INIT_WORK(&i2400ms->tx_worker, i2400ms_tx_submit); 147 snprintf(i2400ms->tx_wq_name, sizeof(i2400ms->tx_wq_name), 148 "%s-tx", i2400m->wimax_dev.name); 149 tx_workqueue = 150 create_singlethread_workqueue(i2400ms->tx_wq_name); 151 if (tx_workqueue == NULL) { 152 dev_err(dev, "TX: failed to create workqueue\n"); 153 result = -ENOMEM; 154 } else 155 result = 0; 156 spin_lock_irqsave(&i2400m->tx_lock, flags); 157 i2400ms->tx_workqueue = tx_workqueue; 158 spin_unlock_irqrestore(&i2400m->tx_lock, flags); 159 d_fnend(5, dev, "(i2400ms %p) = %d\n", i2400ms, result); 160 return result; 161} 162 163void i2400ms_tx_release(struct i2400ms *i2400ms) 164{ 165 struct i2400m *i2400m = &i2400ms->i2400m; 166 struct workqueue_struct *tx_workqueue; 167 unsigned long flags; 168 169 tx_workqueue = i2400ms->tx_workqueue; 170 171 spin_lock_irqsave(&i2400m->tx_lock, flags); 172 i2400ms->tx_workqueue = NULL; 173 spin_unlock_irqrestore(&i2400m->tx_lock, flags); 174 175 if (tx_workqueue) 176 destroy_workqueue(tx_workqueue); 177} 178