linux/drivers/net/wimax/i2400m/sdio-fw.c - nest-guard/1.0/linux - Git at Google

 /*
  * Intel Wireless WiMAX Connection 2400m
  * Firmware uploader's SDIO specifics
  *
  *
  * Copyright (C) 2007-2008 Intel Corporation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  *   * Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  *   * Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in
  *     the documentation and/or other materials provided with the
  *     distribution.
  *   * Neither the name of Intel Corporation nor the names of its
  *     contributors may be used to endorse or promote products derived
  *     from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  *
  * Intel Corporation <linux-wimax@intel.com>
  * Yanir Lubetkin <yanirx.lubetkin@intel.com>
  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
  *  - Initial implementation
  *
  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
  *  - Bus generic/specific split for USB
  *
  * Dirk Brandewie <dirk.j.brandewie@intel.com>
  *  - Initial implementation for SDIO
  *
  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
  *  - SDIO rehash for changes in the bus-driver model
  *
  * Dirk Brandewie <dirk.j.brandewie@intel.com>
  *  - Make it IRQ based, not polling
  *
  * THE PROCEDURE
  *
  * See fw.c for the generic description of this procedure.
  *
  * This file implements only the SDIO specifics. It boils down to how
  * to send a command and waiting for an acknowledgement from the
  * device.
  *
  * All this code is sequential -- all i2400ms_bus_bm_*() functions are
  * executed in the same thread, except i2400ms_bm_irq() [on its own by
  * the SDIO driver]. This makes it possible to avoid locking.
  *
  * COMMAND EXECUTION
  *
  * The generic firmware upload code will call i2400m_bus_bm_cmd_send()
  * to send commands.
  *
  * The SDIO devices expects things in 256 byte blocks, so it will pad
  * it, compute the checksum (if needed) and pass it to SDIO.
  *
  * ACK RECEPTION
  *
  * This works in IRQ mode -- the fw loader says when to wait for data
  * and for that it calls i2400ms_bus_bm_wait_for_ack().
  *
  * This checks if there is any data available (RX size > 0); if not,
  * waits for the IRQ handler to notify about it. Once there is data,
  * it is read and passed to the caller. Doing it this way we don't
  * need much coordination/locking, and it makes it much more difficult
  * for an interrupt to be lost and the wait_for_ack() function getting
  * stuck even when data is pending.
  */
 #include <linux/mmc/sdio_func.h>
 #include "i2400m-sdio.h"


 #define D_SUBMODULE fw
 #include "sdio-debug-levels.h"


 /*
  * Send a boot-mode command to the SDIO function
  *
  * We use a bounce buffer (i2400m->bm_cmd_buf) because we need to
  * touch the header if the RAW flag is not set.
  *
  * @flags: pass thru from i2400m_bm_cmd()
  * @return: cmd_size if ok, < 0 errno code on error.
  *
  * Note the command is padded to the SDIO block size for the device.
  */
 ssize_t i2400ms_bus_bm_cmd_send(struct i2400m *i2400m,
 				const struct i2400m_bootrom_header *_cmd,
 				size_t cmd_size, int flags)
 {
 	ssize_t result;
 	struct device *dev = i2400m_dev(i2400m);
 	struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
 	int opcode = _cmd == NULL ? -1 : i2400m_brh_get_opcode(_cmd);
 	struct i2400m_bootrom_header *cmd;
 	/* SDIO restriction */
 	size_t cmd_size_a = ALIGN(cmd_size, I2400MS_BLK_SIZE);

 	d_fnstart(5, dev, "(i2400m %p cmd %p size %zu)\n",
 		  i2400m, _cmd, cmd_size);
 	result = -E2BIG;
 	if (cmd_size > I2400M_BM_CMD_BUF_SIZE)
 		goto error_too_big;

 	if (_cmd != i2400m->bm_cmd_buf)
 		memmove(i2400m->bm_cmd_buf, _cmd, cmd_size);
 	cmd = i2400m->bm_cmd_buf;
 	if (cmd_size_a > cmd_size)			/* Zero pad space */
 		memset(i2400m->bm_cmd_buf + cmd_size, 0, cmd_size_a - cmd_size);
 	if ((flags & I2400M_BM_CMD_RAW) == 0) {
 		if (WARN_ON(i2400m_brh_get_response_required(cmd) == 0))
 			dev_warn(dev, "SW BUG: response_required == 0\n");
 		i2400m_bm_cmd_prepare(cmd);
 	}
 	d_printf(4, dev, "BM cmd %d: %zu bytes (%zu padded)\n",
 		 opcode, cmd_size, cmd_size_a);
 	d_dump(5, dev, cmd, cmd_size);

 	sdio_claim_host(i2400ms->func);			/* Send & check */
 	result = sdio_memcpy_toio(i2400ms->func, I2400MS_DATA_ADDR,
 				  i2400m->bm_cmd_buf, cmd_size_a);
 	sdio_release_host(i2400ms->func);
 	if (result < 0) {
 		dev_err(dev, "BM cmd %d: cannot send: %ld\n",
 			opcode, (long) result);
 		goto error_cmd_send;
 	}
 	result = cmd_size;
 error_cmd_send:
 error_too_big:
 	d_fnend(5, dev, "(i2400m %p cmd %p size %zu) = %d\n",
 		i2400m, _cmd, cmd_size, (int) result);
 	return result;
 }


 /*
  * Read an ack from the device's boot-mode
  *
  * @i2400m:
  * @_ack: pointer to where to store the read data
  * @ack_size: how many bytes we should read
  *
  * Returns: < 0 errno code on error; otherwise, amount of received bytes.
  *
  * The ACK for a BM command is always at least sizeof(*ack) bytes, so
  * check for that. We don't need to check for device reboots
  *
  */
 ssize_t i2400ms_bus_bm_wait_for_ack(struct i2400m *i2400m,
 				    struct i2400m_bootrom_header *ack,
 				    size_t ack_size)
 {
 	ssize_t result;
 	struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
 	struct sdio_func *func = i2400ms->func;
 	struct device *dev = &func->dev;
 	int size;

 	BUG_ON(sizeof(*ack) > ack_size);

 	d_fnstart(5, dev, "(i2400m %p ack %p size %zu)\n",
 		  i2400m, ack, ack_size);

 	result = wait_event_timeout(i2400ms->bm_wfa_wq,
 				    i2400ms->bm_ack_size != -EINPROGRESS,
 				    2 * HZ);
 	if (result == 0) {
 		result = -ETIMEDOUT;
 		dev_err(dev, "BM: error waiting for an ack\n");
 		goto error_timeout;
 	}

 	spin_lock(&i2400m->rx_lock);
 	result = i2400ms->bm_ack_size;
 	BUG_ON(result == -EINPROGRESS);
 	if (result < 0)        /* so we exit when rx_release() is called */
 		dev_err(dev, "BM: %s failed: %zd\n", __func__, result);
 	else {
 		size = min(ack_size, i2400ms->bm_ack_size);
 		memcpy(ack, i2400m->bm_ack_buf, size);
 	}
 	/*
 	 * Remember always to clear the bm_ack_size to -EINPROGRESS
 	 * after the RX data is processed
 	 */
 	i2400ms->bm_ack_size = -EINPROGRESS;
 	spin_unlock(&i2400m->rx_lock);

 error_timeout:
 	d_fnend(5, dev, "(i2400m %p ack %p size %zu) = %zd\n",
 		i2400m, ack, ack_size, result);
 	return result;
 }
	/*
	* Intel Wireless WiMAX Connection 2400m
	* Firmware uploader's SDIO specifics
	*
	*
	* Copyright (C) 2007-2008 Intel Corporation. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name of Intel Corporation nor the names of its
	* contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*
	*
	* Intel Corporation <linux-wimax@intel.com>
	* Yanir Lubetkin <yanirx.lubetkin@intel.com>
	* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
	* - Initial implementation
	*
	* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
	* - Bus generic/specific split for USB
	*
	* Dirk Brandewie <dirk.j.brandewie@intel.com>
	* - Initial implementation for SDIO
	*
	* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
	* - SDIO rehash for changes in the bus-driver model
	*
	* Dirk Brandewie <dirk.j.brandewie@intel.com>
	* - Make it IRQ based, not polling
	*
	* THE PROCEDURE
	*
	* See fw.c for the generic description of this procedure.
	*
	* This file implements only the SDIO specifics. It boils down to how
	* to send a command and waiting for an acknowledgement from the
	* device.
	*
	* All this code is sequential -- all i2400ms_bus_bm_*() functions are
	* executed in the same thread, except i2400ms_bm_irq() [on its own by
	* the SDIO driver]. This makes it possible to avoid locking.
	*
	* COMMAND EXECUTION
	*
	* The generic firmware upload code will call i2400m_bus_bm_cmd_send()
	* to send commands.
	*
	* The SDIO devices expects things in 256 byte blocks, so it will pad
	* it, compute the checksum (if needed) and pass it to SDIO.
	*
	* ACK RECEPTION
	*
	* This works in IRQ mode -- the fw loader says when to wait for data
	* and for that it calls i2400ms_bus_bm_wait_for_ack().
	*
	* This checks if there is any data available (RX size > 0); if not,
	* waits for the IRQ handler to notify about it. Once there is data,
	* it is read and passed to the caller. Doing it this way we don't
	* need much coordination/locking, and it makes it much more difficult
	* for an interrupt to be lost and the wait_for_ack() function getting
	* stuck even when data is pending.
	*/
	#include <linux/mmc/sdio_func.h>
	#include "i2400m-sdio.h"


	#define D_SUBMODULE fw
	#include "sdio-debug-levels.h"


	/*
	* Send a boot-mode command to the SDIO function
	*
	* We use a bounce buffer (i2400m->bm_cmd_buf) because we need to
	* touch the header if the RAW flag is not set.
	*
	* @flags: pass thru from i2400m_bm_cmd()
	* @return: cmd_size if ok, < 0 errno code on error.
	*
	* Note the command is padded to the SDIO block size for the device.
	*/
	ssize_t i2400ms_bus_bm_cmd_send(struct i2400m *i2400m,
	const struct i2400m_bootrom_header *_cmd,
	size_t cmd_size, int flags)
	{
	ssize_t result;
	struct device *dev = i2400m_dev(i2400m);
	struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
	int opcode = _cmd == NULL ? -1 : i2400m_brh_get_opcode(_cmd);
	struct i2400m_bootrom_header *cmd;
	/* SDIO restriction */
	size_t cmd_size_a = ALIGN(cmd_size, I2400MS_BLK_SIZE);

	d_fnstart(5, dev, "(i2400m %p cmd %p size %zu)\n",
	i2400m, _cmd, cmd_size);
	result = -E2BIG;
	if (cmd_size > I2400M_BM_CMD_BUF_SIZE)
	goto error_too_big;

	if (_cmd != i2400m->bm_cmd_buf)
	memmove(i2400m->bm_cmd_buf, _cmd, cmd_size);
	cmd = i2400m->bm_cmd_buf;
	if (cmd_size_a > cmd_size) /* Zero pad space */
	memset(i2400m->bm_cmd_buf + cmd_size, 0, cmd_size_a - cmd_size);
	if ((flags & I2400M_BM_CMD_RAW) == 0) {
	if (WARN_ON(i2400m_brh_get_response_required(cmd) == 0))
	dev_warn(dev, "SW BUG: response_required == 0\n");
	i2400m_bm_cmd_prepare(cmd);
	}
	d_printf(4, dev, "BM cmd %d: %zu bytes (%zu padded)\n",
	opcode, cmd_size, cmd_size_a);
	d_dump(5, dev, cmd, cmd_size);

	sdio_claim_host(i2400ms->func); /* Send & check */
	result = sdio_memcpy_toio(i2400ms->func, I2400MS_DATA_ADDR,
	i2400m->bm_cmd_buf, cmd_size_a);
	sdio_release_host(i2400ms->func);
	if (result < 0) {
	dev_err(dev, "BM cmd %d: cannot send: %ld\n",
	opcode, (long) result);
	goto error_cmd_send;
	}
	result = cmd_size;
	error_cmd_send:
	error_too_big:
	d_fnend(5, dev, "(i2400m %p cmd %p size %zu) = %d\n",
	i2400m, _cmd, cmd_size, (int) result);
	return result;
	}


	/*
	* Read an ack from the device's boot-mode
	*
	* @i2400m:
	* @_ack: pointer to where to store the read data
	* @ack_size: how many bytes we should read
	*
	* Returns: < 0 errno code on error; otherwise, amount of received bytes.
	*
	* The ACK for a BM command is always at least sizeof(*ack) bytes, so
	* check for that. We don't need to check for device reboots
	*
	*/
	ssize_t i2400ms_bus_bm_wait_for_ack(struct i2400m *i2400m,
	struct i2400m_bootrom_header *ack,
	size_t ack_size)
	{
	ssize_t result;
	struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m);
	struct sdio_func *func = i2400ms->func;
	struct device *dev = &func->dev;
	int size;

	BUG_ON(sizeof(*ack) > ack_size);

	d_fnstart(5, dev, "(i2400m %p ack %p size %zu)\n",
	i2400m, ack, ack_size);

	result = wait_event_timeout(i2400ms->bm_wfa_wq,
	i2400ms->bm_ack_size != -EINPROGRESS,
	2 * HZ);
	if (result == 0) {
	result = -ETIMEDOUT;
	dev_err(dev, "BM: error waiting for an ack\n");
	goto error_timeout;
	}

	spin_lock(&i2400m->rx_lock);
	result = i2400ms->bm_ack_size;
	BUG_ON(result == -EINPROGRESS);
	if (result < 0) /* so we exit when rx_release() is called */
	dev_err(dev, "BM: %s failed: %zd\n", __func__, result);
	else {
	size = min(ack_size, i2400ms->bm_ack_size);
	memcpy(ack, i2400m->bm_ack_buf, size);
	}
	/*
	* Remember always to clear the bm_ack_size to -EINPROGRESS
	* after the RX data is processed
	*/
	i2400ms->bm_ack_size = -EINPROGRESS;
	spin_unlock(&i2400m->rx_lock);

	error_timeout:
	d_fnend(5, dev, "(i2400m %p ack %p size %zu) = %zd\n",
	i2400m, ack, ack_size, result);
	return result;
	}