210 lines
7.0 KiB
C
210 lines
7.0 KiB
C
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/*
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* Intel Wireless WiMAX Connection 2400m
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* Firmware uploader's SDIO specifics
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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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* Yanir Lubetkin <yanirx.lubetkin@intel.com>
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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* - Initial implementation
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*
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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* - Bus generic/specific split for USB
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*
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* Dirk Brandewie <dirk.j.brandewie@intel.com>
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* - Initial implementation for SDIO
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*
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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* - SDIO rehash for changes in the bus-driver model
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*
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* Dirk Brandewie <dirk.j.brandewie@intel.com>
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* - Make it IRQ based, not polling
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*
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* THE PROCEDURE
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*
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* See fw.c for the generic description of this procedure.
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*
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* This file implements only the SDIO specifics. It boils down to how
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* to send a command and waiting for an acknowledgement from the
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* device.
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*
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* All this code is sequential -- all i2400ms_bus_bm_*() functions are
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* executed in the same thread, except i2400ms_bm_irq() [on its own by
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* the SDIO driver]. This makes it possible to avoid locking.
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*
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* COMMAND EXECUTION
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*
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* The generic firmware upload code will call i2400m_bus_bm_cmd_send()
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* to send commands.
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*
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* The SDIO devices expects things in 256 byte blocks, so it will pad
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* it, compute the checksum (if needed) and pass it to SDIO.
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*
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* ACK RECEPTION
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*
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* This works in IRQ mode -- the fw loader says when to wait for data
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* and for that it calls i2400ms_bus_bm_wait_for_ack().
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*
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* This checks if there is any data available (RX size > 0); if not,
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* waits for the IRQ handler to notify about it. Once there is data,
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* it is read and passed to the caller. Doing it this way we don't
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* need much coordination/locking, and it makes it much more difficult
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* for an interrupt to be lost and the wait_for_ack() function getting
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* stuck even when data is pending.
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*/
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#include <linux/mmc/sdio_func.h>
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#include "i2400m-sdio.h"
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#define D_SUBMODULE fw
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#include "sdio-debug-levels.h"
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/*
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* Send a boot-mode command to the SDIO function
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*
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* We use a bounce buffer (i2400m->bm_cmd_buf) because we need to
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* touch the header if the RAW flag is not set.
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*
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* @flags: pass thru from i2400m_bm_cmd()
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* @return: cmd_size if ok, < 0 errno code on error.
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*
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* Note the command is padded to the SDIO block size for the device.
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*/
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ssize_t i2400ms_bus_bm_cmd_send(struct i2400m *i2400m,
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const struct i2400m_bootrom_header *_cmd,
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size_t cmd_size, int flags)
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{
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ssize_t result;
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struct device *dev = i2400m_dev(i2400m);
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struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
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int opcode = _cmd == NULL ? -1 : i2400m_brh_get_opcode(_cmd);
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struct i2400m_bootrom_header *cmd;
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/* SDIO restriction */
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size_t cmd_size_a = ALIGN(cmd_size, I2400MS_BLK_SIZE);
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d_fnstart(5, dev, "(i2400m %p cmd %p size %zu)\n",
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i2400m, _cmd, cmd_size);
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result = -E2BIG;
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if (cmd_size > I2400M_BM_CMD_BUF_SIZE)
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goto error_too_big;
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memcpy(i2400m->bm_cmd_buf, _cmd, cmd_size); /* Prep command */
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cmd = i2400m->bm_cmd_buf;
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if (cmd_size_a > cmd_size) /* Zero pad space */
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memset(i2400m->bm_cmd_buf + cmd_size, 0, cmd_size_a - cmd_size);
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if ((flags & I2400M_BM_CMD_RAW) == 0) {
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if (WARN_ON(i2400m_brh_get_response_required(cmd) == 0))
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dev_warn(dev, "SW BUG: response_required == 0\n");
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i2400m_bm_cmd_prepare(cmd);
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}
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d_printf(4, dev, "BM cmd %d: %zu bytes (%zu padded)\n",
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opcode, cmd_size, cmd_size_a);
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d_dump(5, dev, cmd, cmd_size);
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sdio_claim_host(i2400ms->func); /* Send & check */
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result = sdio_memcpy_toio(i2400ms->func, I2400MS_DATA_ADDR,
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i2400m->bm_cmd_buf, cmd_size_a);
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sdio_release_host(i2400ms->func);
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if (result < 0) {
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dev_err(dev, "BM cmd %d: cannot send: %ld\n",
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opcode, (long) result);
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goto error_cmd_send;
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}
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result = cmd_size;
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error_cmd_send:
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error_too_big:
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d_fnend(5, dev, "(i2400m %p cmd %p size %zu) = %d\n",
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i2400m, _cmd, cmd_size, (int) result);
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return result;
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}
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/*
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* Read an ack from the device's boot-mode
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*
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* @i2400m:
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* @_ack: pointer to where to store the read data
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* @ack_size: how many bytes we should read
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*
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* Returns: < 0 errno code on error; otherwise, amount of received bytes.
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*
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* The ACK for a BM command is always at least sizeof(*ack) bytes, so
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* check for that. We don't need to check for device reboots
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*
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*/
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ssize_t i2400ms_bus_bm_wait_for_ack(struct i2400m *i2400m,
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struct i2400m_bootrom_header *ack,
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size_t ack_size)
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{
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ssize_t result;
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struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
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struct sdio_func *func = i2400ms->func;
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struct device *dev = &func->dev;
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int size;
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BUG_ON(sizeof(*ack) > ack_size);
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d_fnstart(5, dev, "(i2400m %p ack %p size %zu)\n",
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i2400m, ack, ack_size);
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spin_lock(&i2400m->rx_lock);
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i2400ms->bm_ack_size = -EINPROGRESS;
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spin_unlock(&i2400m->rx_lock);
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result = wait_event_timeout(i2400ms->bm_wfa_wq,
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i2400ms->bm_ack_size != -EINPROGRESS,
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2 * HZ);
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if (result == 0) {
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result = -ETIMEDOUT;
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dev_err(dev, "BM: error waiting for an ack\n");
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goto error_timeout;
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}
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spin_lock(&i2400m->rx_lock);
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result = i2400ms->bm_ack_size;
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BUG_ON(result == -EINPROGRESS);
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if (result < 0) /* so we exit when rx_release() is called */
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dev_err(dev, "BM: %s failed: %zd\n", __func__, result);
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else {
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size = min(ack_size, i2400ms->bm_ack_size);
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memcpy(ack, i2400m->bm_ack_buf, size);
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}
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i2400ms->bm_ack_size = -EINPROGRESS;
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spin_unlock(&i2400m->rx_lock);
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error_timeout:
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d_fnend(5, dev, "(i2400m %p ack %p size %zu) = %zd\n",
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i2400m, ack, ack_size, result);
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return result;
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}
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