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linux-next/drivers/net/wimax/i2400m/fw.c
Colin Ian King 3c546728df wimax/i2400m: remove redundant variables ack_status, bcf and protocol 
Variables ack_status, bcf and protocol are being assigned but are
never used hence they are redundant and can be removed.

Also declare ack_type as unsigned int rather than unsigned to clean
up a checkpatch warning.

Cleans up clang warnings:
warning: variable 'ack_status' set but not used [-Wunused-but-set-variable]
warning: variable 'bcf' set but not used [-Wunused-but-set-variable]
warning: variable 'protocol' set but not used [-Wunused-but-set-variable]

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-07-11 22:54:25 -07:00

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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
*
* The 2400m and derived devices work 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.
*
* On boot mode, in USB, we write to the device using the bulk out
* endpoint and read from it in the notification endpoint.
*
* Upon entrance to boot mode, the device sends (preceded with a few
* zero length packets (ZLPs) on the notification endpoint in USB) a
* reboot barker (4 le32 words with the same value). We ack it by
* sending the same barker to the device. The device acks with a
* reboot ack barker (4 le32 words with value I2400M_ACK_BARKER) and
* then is fully booted. At this point we can upload the firmware.
*
* Note that different iterations of the device and EEPROM
* configurations will send different [re]boot barkers; these are
* collected in i2400m_barker_db along with the firmware
* characteristics they require.
*
* 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 did reset during the process.
*
* 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. Optionally more BCF headers might follow the
* main payload. 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.
*
* FIRMWARE LOADING
*
* Note that in some cases, we can't just load a firmware file (for
* example, when resuming). For that, we might cache the firmware
* file. Thus, when doing the bootstrap, if there is a cache firmware
* file, it is used; if not, loading from disk is attempted.
*
* ROADMAP
*
* i2400m_barker_db_init Called by i2400m_driver_init()
* i2400m_barker_db_add
*
* i2400m_barker_db_exit Called by i2400m_driver_exit()
*
* i2400m_dev_bootstrap Called by __i2400m_dev_start()
* request_firmware
* i2400m_fw_bootstrap
* i2400m_fw_check
* i2400m_fw_hdr_check
* i2400m_fw_dnload
* release_firmware
*
* i2400m_fw_dnload
* i2400m_bootrom_init
* i2400m_bm_cmd
* i2400m_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_is_boot_barker
*
* i2400m_bm_cmd_prepare Used by bus-drivers to prep
* commands before sending
*
* i2400m_pm_notifier Called on Power Management events
* i2400m_fw_cache
* i2400m_fw_uncache
*/
#include <linux/firmware.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/export.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);
/*
* Database of known barkers.
*
* A barker is what the device sends indicating he is ready to be
* bootloaded. Different versions of the device will send different
* barkers. Depending on the barker, it might mean the device wants
* some kind of firmware or the other.
*/
static struct i2400m_barker_db {
__le32 data[4];
} *i2400m_barker_db;
static size_t i2400m_barker_db_used, i2400m_barker_db_size;
static
int i2400m_zrealloc_2x(void **ptr, size_t *_count, size_t el_size,
gfp_t gfp_flags)
{
size_t old_count = *_count,
new_count = old_count ? 2 * old_count : 2,
old_size = el_size * old_count,
new_size = el_size * new_count;
void *nptr = krealloc(*ptr, new_size, gfp_flags);
if (nptr) {
/* zero the other half or the whole thing if old_count
* was zero */
if (old_size == 0)
memset(nptr, 0, new_size);
else
memset(nptr + old_size, 0, old_size);
*_count = new_count;
*ptr = nptr;
return 0;
} else
return -ENOMEM;
}
/*
* Add a barker to the database
*
* This cannot used outside of this module and only at at module_init
* time. This is to avoid the need to do locking.
*/
static
int i2400m_barker_db_add(u32 barker_id)
{
int result;
struct i2400m_barker_db *barker;
if (i2400m_barker_db_used >= i2400m_barker_db_size) {
result = i2400m_zrealloc_2x(
(void **) &i2400m_barker_db, &i2400m_barker_db_size,
sizeof(i2400m_barker_db[0]), GFP_KERNEL);
if (result < 0)
return result;
}
barker = i2400m_barker_db + i2400m_barker_db_used++;
barker->data[0] = le32_to_cpu(barker_id);
barker->data[1] = le32_to_cpu(barker_id);
barker->data[2] = le32_to_cpu(barker_id);
barker->data[3] = le32_to_cpu(barker_id);
return 0;
}
void i2400m_barker_db_exit(void)
{
kfree(i2400m_barker_db);
i2400m_barker_db = NULL;
i2400m_barker_db_size = 0;
i2400m_barker_db_used = 0;
}
/*
* Helper function to add all the known stable barkers to the barker
* database.
*/
static
int i2400m_barker_db_known_barkers(void)
{
int result;
result = i2400m_barker_db_add(I2400M_NBOOT_BARKER);
if (result < 0)
goto error_add;
result = i2400m_barker_db_add(I2400M_SBOOT_BARKER);
if (result < 0)
goto error_add;
result = i2400m_barker_db_add(I2400M_SBOOT_BARKER_6050);
if (result < 0)
goto error_add;
error_add:
return result;
}
/*
* Initialize the barker database
*
* This can only be used from the module_init function for this
* module; this is to avoid the need to do locking.
*
* @options: command line argument with extra barkers to
* recognize. This is a comma-separated list of 32-bit hex
* numbers. They are appended to the existing list. Setting 0
* cleans the existing list and starts a new one.
*/
int i2400m_barker_db_init(const char *_options)
{
int result;
char *options = NULL, *options_orig, *token;
i2400m_barker_db = NULL;
i2400m_barker_db_size = 0;
i2400m_barker_db_used = 0;
result = i2400m_barker_db_known_barkers();
if (result < 0)
goto error_add;
/* parse command line options from i2400m.barkers */
if (_options != NULL) {
unsigned barker;
options_orig = kstrdup(_options, GFP_KERNEL);
if (options_orig == NULL) {
result = -ENOMEM;
goto error_parse;
}
options = options_orig;
while ((token = strsep(&options, ",")) != NULL) {
if (*token == '\0') /* eat joint commas */
continue;
if (sscanf(token, "%x", &barker) != 1
|| barker > 0xffffffff) {
printk(KERN_ERR "%s: can't recognize "
"i2400m.barkers value '%s' as "
"a 32-bit number\n",
__func__, token);
result = -EINVAL;
goto error_parse;
}
if (barker == 0) {
/* clean list and start new */
i2400m_barker_db_exit();
continue;
}
result = i2400m_barker_db_add(barker);
if (result < 0)
goto error_add;
}
kfree(options_orig);
}
return 0;
error_parse:
error_add:
kfree(i2400m_barker_db);
return result;
}
/*
* Recognize a boot barker
*
* @buf: buffer where the boot barker.
* @buf_size: size of the buffer (has to be 16 bytes). It is passed
* here so the function can check it for the caller.
*
* Note that as a side effect, upon identifying the obtained boot
* barker, this function will set i2400m->barker to point to the right
* barker database entry. Subsequent calls to the function will result
* in verifying that the same type of boot barker is returned when the
* device [re]boots (as long as the same device instance is used).
*
* Return: 0 if @buf matches a known boot barker. -ENOENT if the
* buffer in @buf doesn't match any boot barker in the database or
* -EILSEQ if the buffer doesn't have the right size.
*/
int i2400m_is_boot_barker(struct i2400m *i2400m,
const void *buf, size_t buf_size)
{
int result;
struct device *dev = i2400m_dev(i2400m);
struct i2400m_barker_db *barker;
int i;
result = -ENOENT;
if (buf_size != sizeof(i2400m_barker_db[i].data))
return result;
/* Short circuit if we have already discovered the barker
* associated with the device. */
if (i2400m->barker
&& !memcmp(buf, i2400m->barker, sizeof(i2400m->barker->data))) {
unsigned index = (i2400m->barker - i2400m_barker_db)
/ sizeof(*i2400m->barker);
d_printf(2, dev, "boot barker cache-confirmed #%u/%08x\n",
index, le32_to_cpu(i2400m->barker->data[0]));
return 0;
}
for (i = 0; i < i2400m_barker_db_used; i++) {
barker = &i2400m_barker_db[i];
BUILD_BUG_ON(sizeof(barker->data) != 16);
if (memcmp(buf, barker->data, sizeof(barker->data)))
continue;
if (i2400m->barker == NULL) {
i2400m->barker = barker;
d_printf(1, dev, "boot barker set to #%u/%08x\n",
i, le32_to_cpu(barker->data[0]));
if (barker->data[0] == le32_to_cpu(I2400M_NBOOT_BARKER))
i2400m->sboot = 0;
else
i2400m->sboot = 1;
} else if (i2400m->barker != barker) {
dev_err(dev, "HW inconsistency: device "
"reports a different boot barker "
"than set (from %08x to %08x)\n",
le32_to_cpu(i2400m->barker->data[0]),
le32_to_cpu(barker->data[0]));
result = -EIO;
} else
d_printf(2, dev, "boot barker confirmed #%u/%08x\n",
i, le32_to_cpu(barker->data[0]));
result = 0;
break;
}
return result;
}
EXPORT_SYMBOL_GPL(i2400m_is_boot_barker);
/*
* 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;
}
result = i2400m_is_boot_barker(i2400m, ack, ack_size);
if (result >= 0) {
result = -ERESTARTSYS;
d_printf(6, dev, "boot-mode cmd %d: HW boot barker\n", opcode);
goto error_reboot;
}
if (ack_size == sizeof(i2400m_ACK_BARKER)
&& memcmp(ack, i2400m_ACK_BARKER, sizeof(*ack)) == 0) {
result = -EISCONN;
d_printf(3, dev, "boot-mode cmd %d: HW reboot ack barker\n",
opcode);
goto error_reboot_ack;
}
result = 0;
if (flags & I2400M_BM_CMD_RAW)
goto out_raw;
ack->data_size = le32_to_cpu(ack->data_size);
ack->target_addr = le32_to_cpu(ack->target_addr);
ack->block_checksum = le32_to_cpu(ack->block_checksum);
d_printf(5, dev, "boot-mode cmd %d: notification for opcode %u "
"response %u csum %u rr %u da %u\n",
opcode, i2400m_brh_get_opcode(ack),
i2400m_brh_get_response(ack),
i2400m_brh_get_use_checksum(ack),
i2400m_brh_get_response_required(ack),
i2400m_brh_get_direct_access(ack));
result = -EIO;
if (i2400m_brh_get_signature(ack) != 0xcbbc) {
dev_err(dev, "boot-mode cmd %d: HW BUG? wrong signature "
"0x%04x\n", opcode, i2400m_brh_get_signature(ack));
goto error_ack_signature;
}
if (opcode != -1 && opcode != i2400m_brh_get_opcode(ack)) {
dev_err(dev, "boot-mode cmd %d: HW BUG? "
"received response for opcode %u, expected %u\n",
opcode, i2400m_brh_get_opcode(ack), opcode);
goto error_ack_opcode;
}
if (i2400m_brh_get_response(ack) != 0) { /* failed? */
dev_err(dev, "boot-mode cmd %d: error; hw response %u\n",
opcode, i2400m_brh_get_response(ack));
goto error_ack_failed;
}
if (ack_size < ack->data_size + sizeof(*ack)) {
dev_err(dev, "boot-mode cmd %d: SW BUG "
"driver provided only %zu bytes for %zu bytes "
"of data\n", opcode, ack_size,
(size_t) le32_to_cpu(ack->data_size) + sizeof(*ack));
goto error_ack_short_buffer;
}
result = ack_size;
/* Don't you love this stack of empty targets? Well, I don't
* either, but it helps track exactly who comes in here and
* why :) */
error_ack_short_buffer:
error_ack_failed:
error_ack_opcode:
error_ack_signature:
out_raw:
error_reboot_ack:
error_reboot:
error_ack_short:
d_fnend(8, dev, "(i2400m %p opcode %d ack %p size %zu) = %d\n",
i2400m, opcode, ack, ack_size, (int) result);
return result;
}
/**
* i2400m_bm_cmd - Execute a boot mode command
*
* @cmd: buffer containing the command data (pointing at the header).
* This data can be ANYWHERE (for USB, we will copy it to an
* specific buffer). Make sure everything is in proper little
* endian.
*
* A raw buffer can be also sent, just cast it and set flags to
* I2400M_BM_CMD_RAW.
*
* This function will generate a checksum for you if the
* checksum bit in the command is set (unless I2400M_BM_CMD_RAW
* is set).
*
* You can use the i2400m->bm_cmd_buf to stage your commands and
* send them.
*
* If NULL, no command is sent (we just wait for an ack).
*
* @cmd_size: size of the command. Will be auto padded to the
* bus-specific drivers padding requirements.
*
* @ack: buffer where to place the acknowledgement. If it is a regular
* command response, all fields will be returned with the right,
* native endianess.
*
* You *cannot* use i2400m->bm_ack_buf for this buffer.
*
* @ack_size: size of @ack, 16 aligned; you need to provide at least
* sizeof(*ack) bytes and then enough to contain the return data
* from the command
*
* @flags: see I2400M_BM_CMD_* above.
*
* @returns: bytes received by the notification; if < 0, an errno code
* denoting an error or:
*
* -ERESTARTSYS The device has rebooted
*
* Executes a boot-mode command and waits for a response, doing basic
* validation on it; if a zero length response is received, it retries
* waiting for a response until a non-zero one is received (timing out
* after %I2400M_BOOT_RETRIES retries).
*/
static
ssize_t i2400m_bm_cmd(struct i2400m *i2400m,
const struct i2400m_bootrom_header *cmd, size_t cmd_size,
struct i2400m_bootrom_header *ack, size_t ack_size,
int flags)
{
ssize_t result = -ENOMEM, rx_bytes;
struct device *dev = i2400m_dev(i2400m);
int opcode = cmd == NULL ? -1 : i2400m_brh_get_opcode(cmd);
d_fnstart(6, dev, "(i2400m %p cmd %p size %zu ack %p size %zu)\n",
i2400m, cmd, cmd_size, ack, ack_size);
BUG_ON(ack_size < sizeof(*ack));
BUG_ON(i2400m->boot_mode == 0);
if (cmd != NULL) { /* send the command */
result = i2400m->bus_bm_cmd_send(i2400m, cmd, cmd_size, flags);
if (result < 0)
goto error_cmd_send;
if ((flags & I2400M_BM_CMD_RAW) == 0)
d_printf(5, dev,
"boot-mode cmd %d csum %u rr %u da %u: "
"addr 0x%04x size %u block csum 0x%04x\n",
opcode, i2400m_brh_get_use_checksum(cmd),
i2400m_brh_get_response_required(cmd),
i2400m_brh_get_direct_access(cmd),
cmd->target_addr, cmd->data_size,
cmd->block_checksum);
}
result = i2400m->bus_bm_wait_for_ack(i2400m, ack, ack_size);
if (result < 0) {
dev_err(dev, "boot-mode cmd %d: error waiting for an ack: %d\n",
opcode, (int) result); /* bah, %zd doesn't work */
goto error_wait_for_ack;
}
rx_bytes = result;
/* verify the ack and read more if necessary [result is the
* final amount of bytes we get in the ack] */
result = __i2400m_bm_ack_verify(i2400m, opcode, ack, ack_size, flags);
if (result < 0)
goto error_bad_ack;
/* Don't you love this stack of empty targets? Well, I don't
* either, but it helps track exactly who comes in here and
* why :) */
result = rx_bytes;
error_bad_ack:
error_wait_for_ack:
error_cmd_send:
d_fnend(6, dev, "(i2400m %p cmd %p size %zu ack %p size %zu) = %d\n",
i2400m, cmd, cmd_size, ack, ack_size, (int) result);
return result;
}
/**
* i2400m_download_chunk - write a single chunk of data to the device's memory
*
* @i2400m: device descriptor
* @buf: the buffer to write
* @buf_len: length of the buffer to write
* @addr: address in the device memory space
* @direct: bootrom write mode
* @do_csum: should a checksum validation be performed
*/
static int i2400m_download_chunk(struct i2400m *i2400m, const void *chunk,
size_t __chunk_len, unsigned long addr,
unsigned int direct, unsigned int do_csum)
{
int ret;
size_t chunk_len = ALIGN(__chunk_len, I2400M_PL_ALIGN);
struct device *dev = i2400m_dev(i2400m);
struct {
struct i2400m_bootrom_header cmd;
u8 cmd_payload[];
} __packed *buf;
struct i2400m_bootrom_header ack;
d_fnstart(5, dev, "(i2400m %p chunk %p __chunk_len %zu addr 0x%08lx "
"direct %u do_csum %u)\n", i2400m, chunk, __chunk_len,
addr, direct, do_csum);
buf = i2400m->bm_cmd_buf;
memcpy(buf->cmd_payload, chunk, __chunk_len);
memset(buf->cmd_payload + __chunk_len, 0xad, chunk_len - __chunk_len);
buf->cmd.command = i2400m_brh_command(I2400M_BRH_WRITE,
__chunk_len & 0x3 ? 0 : do_csum,
__chunk_len & 0xf ? 0 : direct);
buf->cmd.target_addr = cpu_to_le32(addr);
buf->cmd.data_size = cpu_to_le32(__chunk_len);
ret = i2400m_bm_cmd(i2400m, &buf->cmd, sizeof(buf->cmd) + chunk_len,
&ack, sizeof(ack), 0);
if (ret >= 0)
ret = 0;
d_fnend(5, dev, "(i2400m %p chunk %p __chunk_len %zu addr 0x%08lx "
"direct %u do_csum %u) = %d\n", i2400m, chunk, __chunk_len,
addr, direct, do_csum, ret);
return ret;
}
/*
* Download a BCF file's sections to the device
*
* @i2400m: device descriptor
* @bcf: pointer to firmware data (first header followed by the
* payloads). Assumed verified and consistent.
* @bcf_len: length (in bytes) of the @bcf buffer.
*
* Returns: < 0 errno code on error or the offset to the jump instruction.
*
* Given a BCF file, downloads each section (a command and a payload)
* to the device's address space. Actually, it just executes each
* command i the BCF file.
*
* The section size has to be aligned to 4 bytes AND the padding has
* to be taken from the firmware file, as the signature takes it into
* account.
*/
static
ssize_t i2400m_dnload_bcf(struct i2400m *i2400m,
const struct i2400m_bcf_hdr *bcf, size_t bcf_len)
{
ssize_t ret;
struct device *dev = i2400m_dev(i2400m);
size_t offset, /* iterator offset */
data_size, /* Size of the data payload */
section_size, /* Size of the whole section (cmd + payload) */
section = 1;
const struct i2400m_bootrom_header *bh;
struct i2400m_bootrom_header ack;
d_fnstart(3, dev, "(i2400m %p bcf %p bcf_len %zu)\n",
i2400m, bcf, bcf_len);
/* Iterate over the command blocks in the BCF file that start
* after the header */
offset = le32_to_cpu(bcf->header_len) * sizeof(u32);
while (1) { /* start sending the file */
bh = (void *) bcf + offset;
data_size = le32_to_cpu(bh->data_size);
section_size = ALIGN(sizeof(*bh) + data_size, 4);
d_printf(7, dev,
"downloading section #%zu (@%zu %zu B) to 0x%08x\n",
section, offset, sizeof(*bh) + data_size,
le32_to_cpu(bh->target_addr));
/*
* We look for JUMP cmd from the bootmode header,
* either I2400M_BRH_SIGNED_JUMP for secure boot
* or I2400M_BRH_JUMP for unsecure boot, the last chunk
* should be the bootmode header with JUMP cmd.
*/
if (i2400m_brh_get_opcode(bh) == I2400M_BRH_SIGNED_JUMP ||
i2400m_brh_get_opcode(bh) == I2400M_BRH_JUMP) {
d_printf(5, dev, "jump found @%zu\n", offset);
break;
}
if (offset + section_size > bcf_len) {
dev_err(dev, "fw %s: bad section #%zu, "
"end (@%zu) beyond EOF (@%zu)\n",
i2400m->fw_name, section,
offset + section_size, bcf_len);
ret = -EINVAL;
goto error_section_beyond_eof;
}
__i2400m_msleep(20);
ret = i2400m_bm_cmd(i2400m, bh, section_size,
&ack, sizeof(ack), I2400M_BM_CMD_RAW);
if (ret < 0) {
dev_err(dev, "fw %s: section #%zu (@%zu %zu B) "
"failed %d\n", i2400m->fw_name, section,
offset, sizeof(*bh) + data_size, (int) ret);
goto error_send;
}
offset += section_size;
section++;
}
ret = offset;
error_section_beyond_eof:
error_send:
d_fnend(3, dev, "(i2400m %p bcf %p bcf_len %zu) = %d\n",
i2400m, bcf, bcf_len, (int) ret);
return ret;
}
/*
* Indicate if the device emitted a reboot barker that indicates
* "signed boot"
*/
static
unsigned i2400m_boot_is_signed(struct i2400m *i2400m)
{
return likely(i2400m->sboot);
}
/*
* Do the final steps of uploading firmware
*
* @bcf_hdr: BCF header we are actually using
* @bcf: pointer to the firmware image (which matches the first header
* that is followed by the actual payloads).
* @offset: [byte] offset into @bcf for the command we need to send.
*
* Depending on the boot mode (signed vs non-signed), different
* actions need to be taken.
*/
static
int i2400m_dnload_finalize(struct i2400m *i2400m,
const struct i2400m_bcf_hdr *bcf_hdr,
const struct i2400m_bcf_hdr *bcf, size_t offset)
{
int ret = 0;
struct device *dev = i2400m_dev(i2400m);
struct i2400m_bootrom_header *cmd, ack;
struct {
struct i2400m_bootrom_header cmd;
u8 cmd_pl[0];
} __packed *cmd_buf;
size_t signature_block_offset, signature_block_size;
d_fnstart(3, dev, "offset %zu\n", offset);
cmd = (void *) bcf + offset;
if (i2400m_boot_is_signed(i2400m) == 0) {
struct i2400m_bootrom_header jump_ack;
d_printf(1, dev, "unsecure boot, jumping to 0x%08x\n",
le32_to_cpu(cmd->target_addr));
cmd_buf = i2400m->bm_cmd_buf;
memcpy(&cmd_buf->cmd, cmd, sizeof(*cmd));
cmd = &cmd_buf->cmd;
/* now cmd points to the actual bootrom_header in cmd_buf */
i2400m_brh_set_opcode(cmd, I2400M_BRH_JUMP);
cmd->data_size = 0;
ret = i2400m_bm_cmd(i2400m, cmd, sizeof(*cmd),
&jump_ack, sizeof(jump_ack), 0);
} else {
d_printf(1, dev, "secure boot, jumping to 0x%08x\n",
le32_to_cpu(cmd->target_addr));
cmd_buf = i2400m->bm_cmd_buf;
memcpy(&cmd_buf->cmd, cmd, sizeof(*cmd));
signature_block_offset =
sizeof(*bcf_hdr)
+ le32_to_cpu(bcf_hdr->key_size) * sizeof(u32)
+ le32_to_cpu(bcf_hdr->exponent_size) * sizeof(u32);
signature_block_size =
le32_to_cpu(bcf_hdr->modulus_size) * sizeof(u32);
memcpy(cmd_buf->cmd_pl,
(void *) bcf_hdr + signature_block_offset,
signature_block_size);
ret = i2400m_bm_cmd(i2400m, &cmd_buf->cmd,
sizeof(cmd_buf->cmd) + signature_block_size,
&ack, sizeof(ack), I2400M_BM_CMD_RAW);
}
d_fnend(3, dev, "returning %d\n", ret);
return ret;
}
/**
* i2400m_bootrom_init - Reboots a powered device into boot mode
*
* @i2400m: device descriptor
* @flags:
* I2400M_BRI_SOFT: a reboot barker has been seen
* already, so don't wait for it.
*
* I2400M_BRI_NO_REBOOT: Don't send a reboot command, but wait
* for a reboot barker notification. This is a one shot; if
* the state machine needs to send a reboot command it will.
*
* Returns:
*
* < 0 errno code on error, 0 if ok.
*
* Description:
*
* Tries hard enough to put the device in boot-mode. There are two
* main phases to this:
*
* a. (1) send a reboot command and (2) get a reboot barker
*
* b. (1) echo/ack the reboot sending the reboot barker back and (2)
* getting an ack barker in return
*
* We want to skip (a) in some cases [soft]. The state machine is
* horrible, but it is basically: on each phase, send what has to be
* sent (if any), wait for the answer and act on the answer. We might
* have to backtrack and retry, so we keep a max tries counter for
* that.
*
* It sucks because we don't know ahead of time which is going to be
* the reboot barker (the device might send different ones depending
* on its EEPROM config) and once the device reboots and waits for the
* echo/ack reboot barker being sent back, it doesn't understand
* anything else. So we can be left at the point where we don't know
* what to send to it -- cold reset and bus reset seem to have little
* effect. So the function iterates (in this case) through all the
* known barkers and tries them all until an ACK is
* received. Otherwise, it gives up.
*
* If we get a timeout after sending a warm reset, we do it again.
*/
int i2400m_bootrom_init(struct i2400m *i2400m, enum i2400m_bri flags)
{
int result;
struct device *dev = i2400m_dev(i2400m);
struct i2400m_bootrom_header *cmd;
struct i2400m_bootrom_header ack;
int count = i2400m->bus_bm_retries;
int ack_timeout_cnt = 1;
unsigned i;
BUILD_BUG_ON(sizeof(*cmd) != sizeof(i2400m_barker_db[0].data));
BUILD_BUG_ON(sizeof(ack) != sizeof(i2400m_ACK_BARKER));
d_fnstart(4, dev, "(i2400m %p flags 0x%08x)\n", i2400m, flags);
result = -ENOMEM;
cmd = i2400m->bm_cmd_buf;
if (flags & I2400M_BRI_SOFT)
goto do_reboot_ack;
do_reboot:
ack_timeout_cnt = 1;
if (--count < 0)
goto error_timeout;
d_printf(4, dev, "device reboot: reboot command [%d # left]\n",
count);
if ((flags & I2400M_BRI_NO_REBOOT) == 0)
i2400m_reset(i2400m, I2400M_RT_WARM);
result = i2400m_bm_cmd(i2400m, NULL, 0, &ack, sizeof(ack),
I2400M_BM_CMD_RAW);
flags &= ~I2400M_BRI_NO_REBOOT;
switch (result) {
case -ERESTARTSYS:
/*
* at this point, i2400m_bm_cmd(), through
* __i2400m_bm_ack_process(), has updated
* i2400m->barker and we are good to go.
*/
d_printf(4, dev, "device reboot: got reboot barker\n");
break;
case -EISCONN: /* we don't know how it got here...but we follow it */
d_printf(4, dev, "device reboot: got ack barker - whatever\n");
goto do_reboot;
case -ETIMEDOUT:
/*
* Device has timed out, we might be in boot mode
* already and expecting an ack; if we don't know what
* the barker is, we just send them all. Cold reset
* and bus reset don't work. Beats me.
*/
if (i2400m->barker != NULL) {
dev_err(dev, "device boot: reboot barker timed out, "
"trying (set) %08x echo/ack\n",
le32_to_cpu(i2400m->barker->data[0]));
goto do_reboot_ack;
}
for (i = 0; i < i2400m_barker_db_used; i++) {
struct i2400m_barker_db *barker = &i2400m_barker_db[i];
memcpy(cmd, barker->data, sizeof(barker->data));
result = i2400m_bm_cmd(i2400m, cmd, sizeof(*cmd),
&ack, sizeof(ack),
I2400M_BM_CMD_RAW);
if (result == -EISCONN) {
dev_warn(dev, "device boot: got ack barker "
"after sending echo/ack barker "
"#%d/%08x; rebooting j.i.c.\n",
i, le32_to_cpu(barker->data[0]));
flags &= ~I2400M_BRI_NO_REBOOT;
goto do_reboot;
}
}
dev_err(dev, "device boot: tried all the echo/acks, could "
"not get device to respond; giving up");
result = -ESHUTDOWN;
case -EPROTO:
case -ESHUTDOWN: /* dev is gone */
case -EINTR: /* user cancelled */
goto error_dev_gone;
default:
dev_err(dev, "device reboot: error %d while waiting "
"for reboot barker - rebooting\n", result);
d_dump(1, dev, &ack, result);
goto do_reboot;
}
/* At this point we ack back with 4 REBOOT barkers and expect
* 4 ACK barkers. This is ugly, as we send a raw command --
* hence the cast. _bm_cmd() will catch the reboot ack
* notification and report it as -EISCONN. */
do_reboot_ack:
d_printf(4, dev, "device reboot ack: sending ack [%d # left]\n", count);
memcpy(cmd, i2400m->barker->data, sizeof(i2400m->barker->data));
result = i2400m_bm_cmd(i2400m, cmd, sizeof(*cmd),
&ack, sizeof(ack), I2400M_BM_CMD_RAW);
switch (result) {
case -ERESTARTSYS:
d_printf(4, dev, "reboot ack: got reboot barker - retrying\n");
if (--count < 0)
goto error_timeout;
goto do_reboot_ack;
case -EISCONN:
d_printf(4, dev, "reboot ack: got ack barker - good\n");
break;
case -ETIMEDOUT: /* no response, maybe it is the other type? */
if (ack_timeout_cnt-- < 0) {
d_printf(4, dev, "reboot ack timedout: retrying\n");
goto do_reboot_ack;
} else {
dev_err(dev, "reboot ack timedout too long: "
"trying reboot\n");
goto do_reboot;
}
break;
case -EPROTO:
case -ESHUTDOWN: /* dev is gone */
goto error_dev_gone;
default:
dev_err(dev, "device reboot ack: error %d while waiting for "
"reboot ack barker - rebooting\n", result);
goto do_reboot;
}
d_printf(2, dev, "device reboot ack: got ack barker - boot done\n");
result = 0;
exit_timeout:
error_dev_gone:
d_fnend(4, dev, "(i2400m %p flags 0x%08x) = %d\n",
i2400m, flags, result);
return result;
error_timeout:
dev_err(dev, "Timed out waiting for reboot ack\n");
result = -ETIMEDOUT;
goto exit_timeout;
}
/*
* Read the MAC addr
*
* The position this function reads is fixed in device memory and
* always available, even without firmware.
*
* Note we specify we want to read only six bytes, but provide space
* for 16, as we always get it rounded up.
*/
int i2400m_read_mac_addr(struct i2400m *i2400m)
{
int result;
struct device *dev = i2400m_dev(i2400m);
struct net_device *net_dev = i2400m->wimax_dev.net_dev;
struct i2400m_bootrom_header *cmd;
struct {
struct i2400m_bootrom_header ack;
u8 ack_pl[16];
} __packed ack_buf;
d_fnstart(5, dev, "(i2400m %p)\n", i2400m);
cmd = i2400m->bm_cmd_buf;
cmd->command = i2400m_brh_command(I2400M_BRH_READ, 0, 1);
cmd->target_addr = cpu_to_le32(0x00203fe8);
cmd->data_size = cpu_to_le32(6);
result = i2400m_bm_cmd(i2400m, cmd, sizeof(*cmd),
&ack_buf.ack, sizeof(ack_buf), 0);
if (result < 0) {
dev_err(dev, "BM: read mac addr failed: %d\n", result);
goto error_read_mac;
}
d_printf(2, dev, "mac addr is %pM\n", ack_buf.ack_pl);
if (i2400m->bus_bm_mac_addr_impaired == 1) {
ack_buf.ack_pl[0] = 0x00;
ack_buf.ack_pl[1] = 0x16;
ack_buf.ack_pl[2] = 0xd3;
get_random_bytes(&ack_buf.ack_pl[3], 3);
dev_err(dev, "BM is MAC addr impaired, faking MAC addr to "
"mac addr is %pM\n", ack_buf.ack_pl);
result = 0;
}
net_dev->addr_len = ETH_ALEN;
memcpy(net_dev->dev_addr, ack_buf.ack_pl, ETH_ALEN);
error_read_mac:
d_fnend(5, dev, "(i2400m %p) = %d\n", i2400m, result);
return result;
}
/*
* Initialize a non signed boot
*
* This implies sending some magic values to the device's memory. Note
* we convert the values to little endian in the same array
* declaration.
*/
static
int i2400m_dnload_init_nonsigned(struct i2400m *i2400m)
{
unsigned i = 0;
int ret = 0;
struct device *dev = i2400m_dev(i2400m);
d_fnstart(5, dev, "(i2400m %p)\n", i2400m);
if (i2400m->bus_bm_pokes_table) {
while (i2400m->bus_bm_pokes_table[i].address) {
ret = i2400m_download_chunk(
i2400m,
&i2400m->bus_bm_pokes_table[i].data,
sizeof(i2400m->bus_bm_pokes_table[i].data),
i2400m->bus_bm_pokes_table[i].address, 1, 1);
if (ret < 0)
break;
i++;
}
}
d_fnend(5, dev, "(i2400m %p) = %d\n", i2400m, ret);
return ret;
}
/*
* Initialize the signed boot process
*
* @i2400m: device descriptor
*
* @bcf_hdr: pointer to the firmware header; assumes it is fully in
* memory (it has gone through basic validation).
*
* Returns: 0 if ok, < 0 errno code on error, -ERESTARTSYS if the hw
* rebooted.
*
* This writes the firmware BCF header to the device using the
* HASH_PAYLOAD_ONLY command.
*/
static
int i2400m_dnload_init_signed(struct i2400m *i2400m,
const struct i2400m_bcf_hdr *bcf_hdr)
{
int ret;
struct device *dev = i2400m_dev(i2400m);
struct {
struct i2400m_bootrom_header cmd;
struct i2400m_bcf_hdr cmd_pl;
} __packed *cmd_buf;
struct i2400m_bootrom_header ack;
d_fnstart(5, dev, "(i2400m %p bcf_hdr %p)\n", i2400m, bcf_hdr);
cmd_buf = i2400m->bm_cmd_buf;
cmd_buf->cmd.command =
i2400m_brh_command(I2400M_BRH_HASH_PAYLOAD_ONLY, 0, 0);
cmd_buf->cmd.target_addr = 0;
cmd_buf->cmd.data_size = cpu_to_le32(sizeof(cmd_buf->cmd_pl));
memcpy(&cmd_buf->cmd_pl, bcf_hdr, sizeof(*bcf_hdr));
ret = i2400m_bm_cmd(i2400m, &cmd_buf->cmd, sizeof(*cmd_buf),
&ack, sizeof(ack), 0);
if (ret >= 0)
ret = 0;
d_fnend(5, dev, "(i2400m %p bcf_hdr %p) = %d\n", i2400m, bcf_hdr, ret);
return ret;
}
/*
* Initialize the firmware download at the device size
*
* Multiplex to the one that matters based on the device's mode
* (signed or non-signed).
*/
static
int i2400m_dnload_init(struct i2400m *i2400m,
const struct i2400m_bcf_hdr *bcf_hdr)
{
int result;
struct device *dev = i2400m_dev(i2400m);
if (i2400m_boot_is_signed(i2400m)) {
d_printf(1, dev, "signed boot\n");
result = i2400m_dnload_init_signed(i2400m, bcf_hdr);
if (result == -ERESTARTSYS)
return result;
if (result < 0)
dev_err(dev, "firmware %s: signed boot download "
"initialization failed: %d\n",
i2400m->fw_name, result);
} else {
/* non-signed boot process without pokes */
d_printf(1, dev, "non-signed boot\n");
result = i2400m_dnload_init_nonsigned(i2400m);
if (result == -ERESTARTSYS)
return result;
if (result < 0)
dev_err(dev, "firmware %s: non-signed download "
"initialization failed: %d\n",
i2400m->fw_name, result);
}
return result;
}
/*
* Run consistency tests on the firmware file and load up headers
*
* Check for the firmware being made for the i2400m device,
* etc...These checks are mostly informative, as the device will make
* them too; but the driver's response is more informative on what
* went wrong.
*
* This will also look at all the headers present on the firmware
* file, and update i2400m->fw_bcf_hdr to point to them.
*/
static
int i2400m_fw_hdr_check(struct i2400m *i2400m,
const struct i2400m_bcf_hdr *bcf_hdr,
size_t index, size_t offset)
{
struct device *dev = i2400m_dev(i2400m);
unsigned module_type, header_len, major_version, minor_version,
module_id, module_vendor, date, size;
module_type = le32_to_cpu(bcf_hdr->module_type);
header_len = sizeof(u32) * le32_to_cpu(bcf_hdr->header_len);
major_version = (le32_to_cpu(bcf_hdr->header_version) & 0xffff0000)
>> 16;
minor_version = le32_to_cpu(bcf_hdr->header_version) & 0x0000ffff;
module_id = le32_to_cpu(bcf_hdr->module_id);
module_vendor = le32_to_cpu(bcf_hdr->module_vendor);
date = le32_to_cpu(bcf_hdr->date);
size = sizeof(u32) * le32_to_cpu(bcf_hdr->size);
d_printf(1, dev, "firmware %s #%zd@%08zx: BCF header "
"type:vendor:id 0x%x:%x:%x v%u.%u (%u/%u B) built %08x\n",
i2400m->fw_name, index, offset,
module_type, module_vendor, module_id,
major_version, minor_version, header_len, size, date);
/* Hard errors */
if (major_version != 1) {
dev_err(dev, "firmware %s #%zd@%08zx: major header version "
"v%u.%u not supported\n",
i2400m->fw_name, index, offset,
major_version, minor_version);
return -EBADF;
}
if (module_type != 6) { /* built for the right hardware? */
dev_err(dev, "firmware %s #%zd@%08zx: unexpected module "
"type 0x%x; aborting\n",
i2400m->fw_name, index, offset,
module_type);
return -EBADF;
}
if (module_vendor != 0x8086) {
dev_err(dev, "firmware %s #%zd@%08zx: unexpected module "
"vendor 0x%x; aborting\n",
i2400m->fw_name, index, offset, module_vendor);
return -EBADF;
}
if (date < 0x20080300)
dev_warn(dev, "firmware %s #%zd@%08zx: build date %08x "
"too old; unsupported\n",
i2400m->fw_name, index, offset, date);
return 0;
}
/*
* Run consistency tests on the firmware file and load up headers
*
* Check for the firmware being made for the i2400m device,
* etc...These checks are mostly informative, as the device will make
* them too; but the driver's response is more informative on what
* went wrong.
*
* This will also look at all the headers present on the firmware
* file, and update i2400m->fw_hdrs to point to them.
*/
static
int i2400m_fw_check(struct i2400m *i2400m, const void *bcf, size_t bcf_size)
{
int result;
struct device *dev = i2400m_dev(i2400m);
size_t headers = 0;
const struct i2400m_bcf_hdr *bcf_hdr;
const void *itr, *next, *top;
size_t slots = 0, used_slots = 0;
for (itr = bcf, top = itr + bcf_size;
itr < top;
headers++, itr = next) {
size_t leftover, offset, header_len, size;
leftover = top - itr;
offset = itr - bcf;
if (leftover <= sizeof(*bcf_hdr)) {
dev_err(dev, "firmware %s: %zu B left at @%zx, "
"not enough for BCF header\n",
i2400m->fw_name, leftover, offset);
break;
}
bcf_hdr = itr;
/* Only the first header is supposed to be followed by
* payload */
header_len = sizeof(u32) * le32_to_cpu(bcf_hdr->header_len);
size = sizeof(u32) * le32_to_cpu(bcf_hdr->size);
if (headers == 0)
next = itr + size;
else
next = itr + header_len;
result = i2400m_fw_hdr_check(i2400m, bcf_hdr, headers, offset);
if (result < 0)
continue;
if (used_slots + 1 >= slots) {
/* +1 -> we need to account for the one we'll
* occupy and at least an extra one for
* always being NULL */
result = i2400m_zrealloc_2x(
(void **) &i2400m->fw_hdrs, &slots,
sizeof(i2400m->fw_hdrs[0]),
GFP_KERNEL);
if (result < 0)
goto error_zrealloc;
}
i2400m->fw_hdrs[used_slots] = bcf_hdr;
used_slots++;
}
if (headers == 0) {
dev_err(dev, "firmware %s: no usable headers found\n",
i2400m->fw_name);
result = -EBADF;
} else
result = 0;
error_zrealloc:
return result;
}
/*
* Match a barker to a BCF header module ID
*
* The device sends a barker which tells the firmware loader which
* header in the BCF file has to be used. This does the matching.
*/
static
unsigned i2400m_bcf_hdr_match(struct i2400m *i2400m,
const struct i2400m_bcf_hdr *bcf_hdr)
{
u32 barker = le32_to_cpu(i2400m->barker->data[0])
& 0x7fffffff;
u32 module_id = le32_to_cpu(bcf_hdr->module_id)
& 0x7fffffff; /* high bit used for something else */
/* special case for 5x50 */
if (barker == I2400M_SBOOT_BARKER && module_id == 0)
return 1;
if (module_id == barker)
return 1;
return 0;
}
static
const struct i2400m_bcf_hdr *i2400m_bcf_hdr_find(struct i2400m *i2400m)
{
struct device *dev = i2400m_dev(i2400m);
const struct i2400m_bcf_hdr **bcf_itr, *bcf_hdr;
unsigned i = 0;
u32 barker = le32_to_cpu(i2400m->barker->data[0]);
d_printf(2, dev, "finding BCF header for barker %08x\n", barker);
if (barker == I2400M_NBOOT_BARKER) {
bcf_hdr = i2400m->fw_hdrs[0];
d_printf(1, dev, "using BCF header #%u/%08x for non-signed "
"barker\n", 0, le32_to_cpu(bcf_hdr->module_id));
return bcf_hdr;
}
for (bcf_itr = i2400m->fw_hdrs; *bcf_itr != NULL; bcf_itr++, i++) {
bcf_hdr = *bcf_itr;
if (i2400m_bcf_hdr_match(i2400m, bcf_hdr)) {
d_printf(1, dev, "hit on BCF hdr #%u/%08x\n",
i, le32_to_cpu(bcf_hdr->module_id));
return bcf_hdr;
} else
d_printf(1, dev, "miss on BCF hdr #%u/%08x\n",
i, le32_to_cpu(bcf_hdr->module_id));
}
dev_err(dev, "cannot find a matching BCF header for barker %08x\n",
barker);
return NULL;
}
/*
* Download the firmware to the device
*
* @i2400m: device descriptor
* @bcf: pointer to loaded (and minimally verified for consistency)
* firmware
* @bcf_size: size of the @bcf buffer (header plus payloads)
*
* The process for doing this is described in this file's header.
*
* Note we only reinitialize boot-mode if the flags say so. Some hw
* iterations need it, some don't. In any case, if we loop, we always
* need to reinitialize the boot room, hence the flags modification.
*/
static
int i2400m_fw_dnload(struct i2400m *i2400m, const struct i2400m_bcf_hdr *bcf,
size_t fw_size, enum i2400m_bri flags)
{
int ret = 0;
struct device *dev = i2400m_dev(i2400m);
int count = i2400m->bus_bm_retries;
const struct i2400m_bcf_hdr *bcf_hdr;
size_t bcf_size;
d_fnstart(5, dev, "(i2400m %p bcf %p fw size %zu)\n",
i2400m, bcf, fw_size);
i2400m->boot_mode = 1;
wmb(); /* Make sure other readers see it */
hw_reboot:
if (count-- == 0) {
ret = -ERESTARTSYS;
dev_err(dev, "device rebooted too many times, aborting\n");
goto error_too_many_reboots;
}
if (flags & I2400M_BRI_MAC_REINIT) {
ret = i2400m_bootrom_init(i2400m, flags);
if (ret < 0) {
dev_err(dev, "bootrom init failed: %d\n", ret);
goto error_bootrom_init;
}
}
flags |= I2400M_BRI_MAC_REINIT;
/*
* Initialize the download, push the bytes to the device and
* then jump to the new firmware. Note @ret is passed with the
* offset of the jump instruction to _dnload_finalize()
*
* Note we need to use the BCF header in the firmware image
* that matches the barker that the device sent when it
* rebooted, so it has to be passed along.
*/
ret = -EBADF;
bcf_hdr = i2400m_bcf_hdr_find(i2400m);
if (bcf_hdr == NULL)
goto error_bcf_hdr_find;
ret = i2400m_dnload_init(i2400m, bcf_hdr);
if (ret == -ERESTARTSYS)
goto error_dev_rebooted;
if (ret < 0)
goto error_dnload_init;
/*
* bcf_size refers to one header size plus the fw sections size
* indicated by the header,ie. if there are other extended headers
* at the tail, they are not counted
*/
bcf_size = sizeof(u32) * le32_to_cpu(bcf_hdr->size);
ret = i2400m_dnload_bcf(i2400m, bcf, bcf_size);
if (ret == -ERESTARTSYS)
goto error_dev_rebooted;
if (ret < 0) {
dev_err(dev, "fw %s: download failed: %d\n",
i2400m->fw_name, ret);
goto error_dnload_bcf;
}
ret = i2400m_dnload_finalize(i2400m, bcf_hdr, bcf, ret);
if (ret == -ERESTARTSYS)
goto error_dev_rebooted;
if (ret < 0) {
dev_err(dev, "fw %s: "
"download finalization failed: %d\n",
i2400m->fw_name, ret);
goto error_dnload_finalize;
}
d_printf(2, dev, "fw %s successfully uploaded\n",
i2400m->fw_name);
i2400m->boot_mode = 0;
wmb(); /* Make sure i2400m_msg_to_dev() sees boot_mode */
error_dnload_finalize:
error_dnload_bcf:
error_dnload_init:
error_bcf_hdr_find:
error_bootrom_init:
error_too_many_reboots:
d_fnend(5, dev, "(i2400m %p bcf %p size %zu) = %d\n",
i2400m, bcf, fw_size, ret);
return ret;
error_dev_rebooted:
dev_err(dev, "device rebooted, %d tries left\n", count);
/* we got the notification already, no need to wait for it again */
flags |= I2400M_BRI_SOFT;
goto hw_reboot;
}
static
int i2400m_fw_bootstrap(struct i2400m *i2400m, const struct firmware *fw,
enum i2400m_bri flags)
{
int ret;
struct device *dev = i2400m_dev(i2400m);
const struct i2400m_bcf_hdr *bcf; /* Firmware data */
d_fnstart(5, dev, "(i2400m %p)\n", i2400m);
bcf = (void *) fw->data;
ret = i2400m_fw_check(i2400m, bcf, fw->size);
if (ret >= 0)
ret = i2400m_fw_dnload(i2400m, bcf, fw->size, flags);
if (ret < 0)
dev_err(dev, "%s: cannot use: %d, skipping\n",
i2400m->fw_name, ret);
kfree(i2400m->fw_hdrs);
i2400m->fw_hdrs = NULL;
d_fnend(5, dev, "(i2400m %p) = %d\n", i2400m, ret);
return ret;
}
/* Refcounted container for firmware data */
struct i2400m_fw {
struct kref kref;
const struct firmware *fw;
};
static
void i2400m_fw_destroy(struct kref *kref)
{
struct i2400m_fw *i2400m_fw =
container_of(kref, struct i2400m_fw, kref);
release_firmware(i2400m_fw->fw);
kfree(i2400m_fw);
}
static
struct i2400m_fw *i2400m_fw_get(struct i2400m_fw *i2400m_fw)
{
if (i2400m_fw != NULL && i2400m_fw != (void *) ~0)
kref_get(&i2400m_fw->kref);
return i2400m_fw;
}
static
void i2400m_fw_put(struct i2400m_fw *i2400m_fw)
{
kref_put(&i2400m_fw->kref, i2400m_fw_destroy);
}
/**
* i2400m_dev_bootstrap - Bring the device to a known state and upload firmware
*
* @i2400m: device descriptor
*
* Returns: >= 0 if ok, < 0 errno code on error.
*
* This sets up the firmware upload environment, loads the firmware
* file from disk, verifies and then calls the firmware upload process
* per se.
*
* Can be called either from probe, or after a warm reset. Can not be
* called from within an interrupt. All the flow in this code is
* single-threade; all I/Os are synchronous.
*/
int i2400m_dev_bootstrap(struct i2400m *i2400m, enum i2400m_bri flags)
{
int ret, itr;
struct device *dev = i2400m_dev(i2400m);
struct i2400m_fw *i2400m_fw;
const struct firmware *fw;
const char *fw_name;
d_fnstart(5, dev, "(i2400m %p)\n", i2400m);
ret = -ENODEV;
spin_lock(&i2400m->rx_lock);
i2400m_fw = i2400m_fw_get(i2400m->fw_cached);
spin_unlock(&i2400m->rx_lock);
if (i2400m_fw == (void *) ~0) {
dev_err(dev, "can't load firmware now!");
goto out;
} else if (i2400m_fw != NULL) {
dev_info(dev, "firmware %s: loading from cache\n",
i2400m->fw_name);
ret = i2400m_fw_bootstrap(i2400m, i2400m_fw->fw, flags);
i2400m_fw_put(i2400m_fw);
goto out;
}
/* Load firmware files to memory. */
for (itr = 0, ret = -ENOENT; ; itr++) {
fw_name = i2400m->bus_fw_names[itr];
if (fw_name == NULL) {
dev_err(dev, "Could not find a usable firmware image\n");
break;
}
d_printf(1, dev, "trying firmware %s (%d)\n", fw_name, itr);
ret = request_firmware(&fw, fw_name, dev);
if (ret < 0) {
dev_err(dev, "fw %s: cannot load file: %d\n",
fw_name, ret);
continue;
}
i2400m->fw_name = fw_name;
ret = i2400m_fw_bootstrap(i2400m, fw, flags);
release_firmware(fw);
if (ret >= 0) /* firmware loaded successfully */
break;
i2400m->fw_name = NULL;
}
out:
d_fnend(5, dev, "(i2400m %p) = %d\n", i2400m, ret);
return ret;
}
EXPORT_SYMBOL_GPL(i2400m_dev_bootstrap);
void i2400m_fw_cache(struct i2400m *i2400m)
{
int result;
struct i2400m_fw *i2400m_fw;
struct device *dev = i2400m_dev(i2400m);
/* if there is anything there, free it -- now, this'd be weird */
spin_lock(&i2400m->rx_lock);
i2400m_fw = i2400m->fw_cached;
spin_unlock(&i2400m->rx_lock);
if (i2400m_fw != NULL && i2400m_fw != (void *) ~0) {
i2400m_fw_put(i2400m_fw);
WARN(1, "%s:%u: still cached fw still present?\n",
__func__, __LINE__);
}
if (i2400m->fw_name == NULL) {
dev_err(dev, "firmware n/a: can't cache\n");
i2400m_fw = (void *) ~0;
goto out;
}
i2400m_fw = kzalloc(sizeof(*i2400m_fw), GFP_ATOMIC);
if (i2400m_fw == NULL)
goto out;
kref_init(&i2400m_fw->kref);
result = request_firmware(&i2400m_fw->fw, i2400m->fw_name, dev);
if (result < 0) {
dev_err(dev, "firmware %s: failed to cache: %d\n",
i2400m->fw_name, result);
kfree(i2400m_fw);
i2400m_fw = (void *) ~0;
} else
dev_info(dev, "firmware %s: cached\n", i2400m->fw_name);
out:
spin_lock(&i2400m->rx_lock);
i2400m->fw_cached = i2400m_fw;
spin_unlock(&i2400m->rx_lock);
}
void i2400m_fw_uncache(struct i2400m *i2400m)
{
struct i2400m_fw *i2400m_fw;
spin_lock(&i2400m->rx_lock);
i2400m_fw = i2400m->fw_cached;
i2400m->fw_cached = NULL;
spin_unlock(&i2400m->rx_lock);
if (i2400m_fw != NULL && i2400m_fw != (void *) ~0)
i2400m_fw_put(i2400m_fw);
}
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