drivers/net/wimax/i2400m/sdio-fw.c

   1 /*
   2  * Intel Wireless WiMAX Connection 2400m
   3  * Firmware uploader's SDIO specifics
   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  * Yanir Lubetkin <yanirx.lubetkin@intel.com>
  37  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
  38  *  - Initial implementation
  39  *
  40  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
  41  *  - Bus generic/specific split for USB
  42  *
  43  * Dirk Brandewie <dirk.j.brandewie@intel.com>
  44  *  - Initial implementation for SDIO
  45  *
  46  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
  47  *  - SDIO rehash for changes in the bus-driver model
  48  *
  49  * Dirk Brandewie <dirk.j.brandewie@intel.com>
  50  *  - Make it IRQ based, not polling
  51  *
  52  * THE PROCEDURE
  53  *
  54  * See fw.c for the generic description of this procedure.
  55  *
  56  * This file implements only the SDIO specifics. It boils down to how
  57  * to send a command and waiting for an acknowledgement from the
  58  * device.
  59  *
  60  * All this code is sequential -- all i2400ms_bus_bm_*() functions are
  61  * executed in the same thread, except i2400ms_bm_irq() [on its own by
  62  * the SDIO driver]. This makes it possible to avoid locking.
  63  *
  64  * COMMAND EXECUTION
  65  *
  66  * The generic firmware upload code will call i2400m_bus_bm_cmd_send()
  67  * to send commands.
  68  *
  69  * The SDIO devices expects things in 256 byte blocks, so it will pad
  70  * it, compute the checksum (if needed) and pass it to SDIO.
  71  *
  72  * ACK RECEPTION
  73  *
  74  * This works in IRQ mode -- the fw loader says when to wait for data
  75  * and for that it calls i2400ms_bus_bm_wait_for_ack().
  76  *
  77  * This checks if there is any data available (RX size > 0); if not,
  78  * waits for the IRQ handler to notify about it. Once there is data,
  79  * it is read and passed to the caller. Doing it this way we don't
  80  * need much coordination/locking, and it makes it much more difficult
  81  * for an interrupt to be lost and the wait_for_ack() function getting
  82  * stuck even when data is pending.
  83  */
  84 #include <linux/mmc/sdio_func.h>
  85 #include "i2400m-sdio.h"
  86
  87
  88 #define D_SUBMODULE fw
  89 #include "sdio-debug-levels.h"
  90
  91
  92 /*
  93  * Send a boot-mode command to the SDIO function
  94  *
  95  * We use a bounce buffer (i2400m->bm_cmd_buf) because we need to
  96  * touch the header if the RAW flag is not set.
  97  *
  98  * @flags: pass thru from i2400m_bm_cmd()
  99  * @return: cmd_size if ok, < 0 errno code on error.
 100  *
 101  * Note the command is padded to the SDIO block size for the device.
 102  */
 103 ssize_t i2400ms_bus_bm_cmd_send(struct i2400m *i2400m,
 104                                 const struct i2400m_bootrom_header *_cmd,
 105                                 size_t cmd_size, int flags)
 106 {
 107         ssize_t result;
 108         struct device *dev = i2400m_dev(i2400m);
 109         struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
 110         int opcode = _cmd == NULL ? -1 : i2400m_brh_get_opcode(_cmd);
 111         struct i2400m_bootrom_header *cmd;
 112         /* SDIO restriction */
 113         size_t cmd_size_a = ALIGN(cmd_size, I2400MS_BLK_SIZE);
 114
 115         d_fnstart(5, dev, "(i2400m %p cmd %p size %zu)\n",
 116                   i2400m, _cmd, cmd_size);
 117         result = -E2BIG;
 118         if (cmd_size > I2400M_BM_CMD_BUF_SIZE)
 119                 goto error_too_big;
 120
 121         if (_cmd != i2400m->bm_cmd_buf)
 122                 memmove(i2400m->bm_cmd_buf, _cmd, cmd_size);
 123         cmd = i2400m->bm_cmd_buf;
 124         if (cmd_size_a > cmd_size)                      /* Zero pad space */
 125                 memset(i2400m->bm_cmd_buf + cmd_size, 0, cmd_size_a - cmd_size);
 126         if ((flags & I2400M_BM_CMD_RAW) == 0) {
 127                 if (WARN_ON(i2400m_brh_get_response_required(cmd) == 0))
 128                         dev_warn(dev, "SW BUG: response_required == 0\n");
 129                 i2400m_bm_cmd_prepare(cmd);
 130         }
 131         d_printf(4, dev, "BM cmd %d: %zu bytes (%zu padded)\n",
 132                  opcode, cmd_size, cmd_size_a);
 133         d_dump(5, dev, cmd, cmd_size);
 134
 135         sdio_claim_host(i2400ms->func);                 /* Send & check */
 136         result = sdio_memcpy_toio(i2400ms->func, I2400MS_DATA_ADDR,
 137                                   i2400m->bm_cmd_buf, cmd_size_a);
 138         sdio_release_host(i2400ms->func);
 139         if (result < 0) {
 140                 dev_err(dev, "BM cmd %d: cannot send: %ld\n",
 141                         opcode, (long) result);
 142                 goto error_cmd_send;
 143         }
 144         result = cmd_size;
 145 error_cmd_send:
 146 error_too_big:
 147         d_fnend(5, dev, "(i2400m %p cmd %p size %zu) = %d\n",
 148                 i2400m, _cmd, cmd_size, (int) result);
 149         return result;
 150 }
 151
 152
 153 /*
 154  * Read an ack from the device's boot-mode
 155  *
 156  * @i2400m:
 157  * @_ack: pointer to where to store the read data
 158  * @ack_size: how many bytes we should read
 159  *
 160  * Returns: < 0 errno code on error; otherwise, amount of received bytes.
 161  *
 162  * The ACK for a BM command is always at least sizeof(*ack) bytes, so
 163  * check for that. We don't need to check for device reboots
 164  *
 165  */
 166 ssize_t i2400ms_bus_bm_wait_for_ack(struct i2400m *i2400m,
 167                                     struct i2400m_bootrom_header *ack,
 168                                     size_t ack_size)
 169 {
 170         ssize_t result;
 171         struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
 172         struct sdio_func *func = i2400ms->func;
 173         struct device *dev = &func->dev;
 174         int size;
 175
 176         BUG_ON(sizeof(*ack) > ack_size);
 177
 178         d_fnstart(5, dev, "(i2400m %p ack %p size %zu)\n",
 179                   i2400m, ack, ack_size);
 180
 181         result = wait_event_timeout(i2400ms->bm_wfa_wq,
 182                                     i2400ms->bm_ack_size != -EINPROGRESS,
 183                                     2 * HZ);
 184         if (result == 0) {
 185                 result = -ETIMEDOUT;
 186                 dev_err(dev, "BM: error waiting for an ack\n");
 187                 goto error_timeout;
 188         }
 189
 190         spin_lock(&i2400m->rx_lock);
 191         result = i2400ms->bm_ack_size;
 192         BUG_ON(result == -EINPROGRESS);
 193         if (result < 0)        /* so we exit when rx_release() is called */
 194                 dev_err(dev, "BM: %s failed: %zd\n", __func__, result);
 195         else {
 196                 size = min(ack_size, i2400ms->bm_ack_size);
 197                 memcpy(ack, i2400m->bm_ack_buf, size);
 198         }
 199         /*
 200          * Remember always to clear the bm_ack_size to -EINPROGRESS
 201          * after the RX data is processed
 202          */
 203         i2400ms->bm_ack_size = -EINPROGRESS;
 204         spin_unlock(&i2400m->rx_lock);
 205
 206 error_timeout:
 207         d_fnend(5, dev, "(i2400m %p ack %p size %zu) = %zd\n",
 208                 i2400m, ack, ack_size, result);
 209         return result;
 210 }