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linux/drivers/net/wimax/i2400m/fw.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

1657 lines
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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. In SDIO we
* talk to it via the write address and read from the read address.
*
* Upon entrance to boot mode, the device sends (preceeded 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 "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)
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[chunk_len];
} __attribute__((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];
} __attribute__((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];
} __attribute__((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->perm_addr, ack_buf.ack_pl, 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;
} __attribute__((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 = 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 - (const void *) 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 i2400m_bcf_hdr *bcf; /* Firmware data */
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, bcf = NULL, 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 succesfully */
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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