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|
/*
* Intel Wireless WiMAX Connection 2400m
* Firmware uploader
*
*
* 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
*
*
* THE PROCEDURE
*
* (this is decribed for USB, but for SDIO is similar)
*
* The 2400m works in two modes: boot-mode or normal mode. In boot
* mode we can execute only a handful of commands targeted at
* uploading the firmware and launching it.
*
* The 2400m enters boot mode when it is first connected to the
* system, when it crashes and when you ask it to reboot. There are
* two submodes of the boot mode: signed and non-signed. Signed takes
* firmwares signed with a certain private key, non-signed takes any
* firmware. Normal hardware takes only signed firmware.
*
* Upon entrance to boot mode, the device sends a few zero length
* packets (ZLPs) on the notification endpoint, then a reboot barker
* (4 le32 words with value I2400M_{S,N}BOOT_BARKER). We ack it by
* sending the same barker on the bulk out endpoint. The device acks
* with a reboot ack barker (4 le32 words with value 0xfeedbabe) and
* then the device is fully rebooted. At this point we can upload the
* firmware.
*
* This process is accomplished by the i2400m_bootrom_init()
* function. All the device interaction happens through the
* i2400m_bm_cmd() [boot mode command]. Special return values will
* indicate if the device resets.
*
* After this, we read the MAC address and then (if needed)
* reinitialize the device. We need to read it ahead of time because
* in the future, we might not upload the firmware until userspace
* 'ifconfig up's the device.
*
* We can then upload the firmware file. The file is composed of a BCF
* header (basic data, keys and signatures) and a list of write
* commands and payloads. We first upload the header
* [i2400m_dnload_init()] and then pass the commands and payloads
* verbatim to the i2400m_bm_cmd() function
* [i2400m_dnload_bcf()]. Then we tell the device to jump to the new
* firmware [i2400m_dnload_finalize()].
*
* Once firmware is uploaded, we are good to go :)
*
* When we don't know in which mode we are, we first try by sending a
* warm reset request that will take us to boot-mode. If we time out
* waiting for a reboot barker, that means maybe we are already in
* boot mode, so we send a reboot barker.
*
* COMMAND EXECUTION
*
* This code (and process) is single threaded; for executing commands,
* we post a URB to the notification endpoint, post the command, wait
* for data on the notification buffer. We don't need to worry about
* others as we know we are the only ones in there.
*
* BACKEND IMPLEMENTATION
*
* This code is bus-generic; the bus-specific driver provides back end
* implementations to send a boot mode command to the device and to
* read an acknolwedgement from it (or an asynchronous notification)
* from it.
*
* ROADMAP
*
* i2400m_dev_bootstrap Called by __i2400m_dev_start()
* request_firmware
* i2400m_fw_check
* i2400m_fw_dnload
* release_firmware
*
* i2400m_fw_dnload
* i2400m_bootrom_init
* i2400m_bm_cmd
* i2400m->bus_reset
* i2400m_dnload_init
* i2400m_dnload_init_signed
* i2400m_dnload_init_nonsigned
* i2400m_download_chunk
* i2400m_bm_cmd
* i2400m_dnload_bcf
* i2400m_bm_cmd
* i2400m_dnload_finalize
* i2400m_bm_cmd
*
* i2400m_bm_cmd
* i2400m->bus_bm_cmd_send()
* i2400m->bus_bm_wait_for_ack
* __i2400m_bm_ack_verify
*
* i2400m_bm_cmd_prepare Used by bus-drivers to prep
* commands before sending
*/
#include <linux/firmware.h>
#include <linux/sched.h>
#include <linux/usb.h>
#include "i2400m.h"
#define D_SUBMODULE fw
#include "debug-levels.h"
static const __le32 i2400m_ACK_BARKER[4] = {
cpu_to_le32(I2400M_ACK_BARKER),
cpu_to_le32(I2400M_ACK_BARKER),
cpu_to_le32(I2400M_ACK_BARKER),
cpu_to_le32(I2400M_ACK_BARKER)
};
/**
* Prepare a boot-mode command for delivery
*
* @cmd: pointer to bootrom header to prepare
*
* Computes checksum if so needed. After calling this function, DO NOT
* modify the command or header as the checksum won't work anymore.
*
* We do it from here because some times we cannot do it in the
* original context the command was sent (it is a const), so when we
* copy it to our staging buffer, we add the checksum there.
*/
void i2400m_bm_cmd_prepare(struct i2400m_bootrom_header *cmd)
{
if (i2400m_brh_get_use_checksum(cmd)) {
int i;
u32 checksum = 0;
const u32 *checksum_ptr = (void *) cmd->payload;
for (i = 0; i < cmd->data_size / 4; i++)
checksum += cpu_to_le32(*checksum_ptr++);
checksum += cmd->command + cmd->target_addr + cmd->data_size;
cmd->block_checksum = cpu_to_le32(checksum);
}
}
EXPORT_SYMBOL_GPL(i2400m_bm_cmd_prepare);
/*
* Verify the ack data received
*
* Given a reply to a boot mode command, chew it and verify everything
* is ok.
*
* @opcode: opcode which generated this ack. For error messages.
* @ack: pointer to ack data we received
* @ack_size: size of that data buffer
* @flags: I2400M_BM_CMD_* flags we called the command with.
*
* Way too long function -- maybe it should be further split
*/
static
ssize_t __i2400m_bm_ack_verify(struct i2400m *i2400m, int opcode,
struct i2400m_bootrom_header *ack,
size_t ack_size, int flags)
{
ssize_t result = -ENOMEM;
struct device *dev = i2400m_dev(i2400m);
d_fnstart(8, dev, "(i2400m %p opcode %d ack %p size %zu)\n",
i2400m, opcode, ack, ack_size);
if (ack_size < sizeof(*ack)) {
result = -EIO;
dev_err(dev, "boot-mode cmd %d: HW BUG? notification didn't "
"return enough data (%zu bytes vs %zu expected)\n",
opcode, ack_size, sizeof(*ack));
goto error_ack_short;
}
if (ack_size == sizeof(i2400m_NBOOT_BARKER)
&& memcmp(ack, i2400m_NBOOT_BARKER,
|