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rt2x00: Move firmware checksumming to driver

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rt2x00lib depended on 2 crc algorithms because rt61/rt73
use a different algorithm then rt2800. This means that
even when only 1 algorithm was needed, the dependency was
still present for both.
By moving the checksum generation to the driver we can clean
up 2 annoying flags (which indicated which checksum was required)
and move the dependency to where it belongs: the driver.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ivo van Doorn 2008-03-09 22:44:54 +01:00 committed by John W. Linville
parent 5f46c4d053
commit a7f3a06cbb
5 changed files with 50 additions and 47 deletions
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4
drivers/net/wireless/rt2x00/Kconfig
View File

@ -27,8 +27,6 @@ config RT2X00_LIB_USB
config RT2X00_LIB_FIRMWARE
boolean
depends on RT2X00_LIB
select CRC_CCITT
select CRC_ITU_T
select FW_LOADER
config RT2X00_LIB_RFKILL
@ -102,6 +100,7 @@ config RT61PCI
depends on PCI
select RT2X00_LIB_PCI
select RT2X00_LIB_FIRMWARE
select CRC_ITU_T
select EEPROM_93CX6
---help---
This is an experimental driver for the Ralink rt61 wireless chip.
@ -145,6 +144,7 @@ config RT73USB
depends on USB
select RT2X00_LIB_USB
select RT2X00_LIB_FIRMWARE
select CRC_ITU_T
---help---
This is an experimental driver for the Ralink rt73 wireless chip.

3
drivers/net/wireless/rt2x00/rt2x00.h
View File

@ -495,6 +495,7 @@ struct rt2x00lib_ops {
*/
int (*probe_hw) (struct rt2x00_dev *rt2x00dev);
char *(*get_firmware_name) (struct rt2x00_dev *rt2x00dev);
u16 (*get_firmware_crc) (void *data, const size_t len);
int (*load_firmware) (struct rt2x00_dev *rt2x00dev, void *data,
const size_t len);
@ -613,8 +614,6 @@ enum rt2x00_flags {
*/
DRIVER_SUPPORT_MIXED_INTERFACES,
DRIVER_REQUIRE_FIRMWARE,
DRIVER_REQUIRE_FIRMWARE_CRC_ITU_T,
DRIVER_REQUIRE_FIRMWARE_CCITT,
DRIVER_REQUIRE_BEACON_GUARD,
DRIVER_REQUIRE_ATIM_QUEUE,

34
drivers/net/wireless/rt2x00/rt2x00firmware.c
View File

@ -23,8 +23,6 @@
Abstract: rt2x00 firmware loading routines.
*/
#include <linux/crc-ccitt.h>
#include <linux/crc-itu-t.h>
#include <linux/kernel.h>
#include <linux/module.h>
@ -63,36 +61,7 @@ static int rt2x00lib_request_firmware(struct rt2x00_dev *rt2x00dev)
return -ENOENT;
}
/*
* Perform crc validation on the firmware.
* The last 2 bytes in the firmware array are the crc checksum itself,
* this means that we should never pass those 2 bytes to the crc
* algorithm.
*/
if (test_bit(DRIVER_REQUIRE_FIRMWARE_CRC_ITU_T, &rt2x00dev->flags)) {
/*
* Use the crc itu-t algorithm.
* Use 0 for the last 2 bytes to complete the checksum.
*/
crc = crc_itu_t(0, fw->data, fw->size - 2);
crc = crc_itu_t_byte(crc, 0);
crc = crc_itu_t_byte(crc, 0);
} else if (test_bit(DRIVER_REQUIRE_FIRMWARE_CCITT, &rt2x00dev->flags)) {
/*
* Use the crc ccitt algorithm.
* This will return the same value as the legacy driver which
* used bit ordering reversion on the both the firmware bytes
* before input input as well as on the final output.
* Obviously using crc ccitt directly is much more efficient.
*/
crc = crc_ccitt(~0, fw->data, fw->size - 2);
} else {
ERROR(rt2x00dev, "No checksum algorithm selected "
"for firmware validation.\n");
retval = -ENOENT;
goto exit;
}
crc = rt2x00dev->ops->lib->get_firmware_crc(fw->data, fw->size);
if (crc != (fw->data[fw->size - 2] << 8 | fw->data[fw->size - 1])) {
ERROR(rt2x00dev, "Firmware checksum error.\n");
retval = -ENOENT;
@ -139,4 +108,3 @@ void rt2x00lib_free_firmware(struct rt2x00_dev *rt2x00dev)
release_firmware(rt2x00dev->fw);
rt2x00dev->fw = NULL;
}

28
drivers/net/wireless/rt2x00/rt61pci.c
View File

@ -24,6 +24,7 @@
Supported chipsets: RT2561, RT2561s, RT2661.
*/
#include <linux/crc-itu-t.h>
#include <linux/delay.h>
#include <linux/etherdevice.h>
#include <linux/init.h>
@ -856,7 +857,7 @@ static void rt61pci_link_tuner(struct rt2x00_dev *rt2x00dev)
}
/*
* Firmware name function.
* Firmware functions
*/
static char *rt61pci_get_firmware_name(struct rt2x00_dev *rt2x00dev)
{
@ -880,9 +881,23 @@ static char *rt61pci_get_firmware_name(struct rt2x00_dev *rt2x00dev)
return fw_name;
}
/*
* Initialization functions.
*/
static u16 rt61pci_get_firmware_crc(void *data, const size_t len)
{
u16 crc;
/*
* Use the crc itu-t algorithm.
* The last 2 bytes in the firmware array are the crc checksum itself,
* this means that we should never pass those 2 bytes to the crc
* algorithm.
*/
crc = crc_itu_t(0, data, len - 2);
crc = crc_itu_t_byte(crc, 0);
crc = crc_itu_t_byte(crc, 0);
return crc;
}
static int rt61pci_load_firmware(struct rt2x00_dev *rt2x00dev, void *data,
const size_t len)
{
@ -963,6 +978,9 @@ static int rt61pci_load_firmware(struct rt2x00_dev *rt2x00dev, void *data,
return 0;
}
/*
* Initialization functions.
*/
static void rt61pci_init_rxentry(struct rt2x00_dev *rt2x00dev,
struct queue_entry *entry)
{
@ -2257,7 +2275,6 @@ static int rt61pci_probe_hw(struct rt2x00_dev *rt2x00dev)
* This device requires firmware.
*/
__set_bit(DRIVER_REQUIRE_FIRMWARE, &rt2x00dev->flags);
__set_bit(DRIVER_REQUIRE_FIRMWARE_CRC_ITU_T, &rt2x00dev->flags);
/*
* Set the rssi offset.
@ -2457,6 +2474,7 @@ static const struct rt2x00lib_ops rt61pci_rt2x00_ops = {
.irq_handler = rt61pci_interrupt,
.probe_hw = rt61pci_probe_hw,
.get_firmware_name = rt61pci_get_firmware_name,
.get_firmware_crc = rt61pci_get_firmware_crc,
.load_firmware = rt61pci_load_firmware,
.initialize = rt2x00pci_initialize,
.uninitialize = rt2x00pci_uninitialize,

28
drivers/net/wireless/rt2x00/rt73usb.c
View File

@ -24,6 +24,7 @@
Supported chipsets: rt2571W & rt2671.
*/
#include <linux/crc-itu-t.h>
#include <linux/delay.h>
#include <linux/etherdevice.h>
#include <linux/init.h>
@ -817,16 +818,30 @@ static void rt73usb_link_tuner(struct rt2x00_dev *rt2x00dev)
}
/*
* Firmware name function.
* Firmware functions
*/
static char *rt73usb_get_firmware_name(struct rt2x00_dev *rt2x00dev)
{
return FIRMWARE_RT2571;
}
/*
* Initialization functions.
*/
static u16 rt73usb_get_firmware_crc(void *data, const size_t len)
{
u16 crc;
/*
* Use the crc itu-t algorithm.
* The last 2 bytes in the firmware array are the crc checksum itself,
* this means that we should never pass those 2 bytes to the crc
* algorithm.
*/
crc = crc_itu_t(0, data, len - 2);
crc = crc_itu_t_byte(crc, 0);
crc = crc_itu_t_byte(crc, 0);
return crc;
}
static int rt73usb_load_firmware(struct rt2x00_dev *rt2x00dev, void *data,
const size_t len)
{
@ -896,6 +911,9 @@ static int rt73usb_load_firmware(struct rt2x00_dev *rt2x00dev, void *data,
return 0;
}
/*
* Initialization functions.
*/
static int rt73usb_init_registers(struct rt2x00_dev *rt2x00dev)
{
u32 reg;
@ -1852,7 +1870,6 @@ static int rt73usb_probe_hw(struct rt2x00_dev *rt2x00dev)
* This device requires firmware.
*/
__set_bit(DRIVER_REQUIRE_FIRMWARE, &rt2x00dev->flags);
__set_bit(DRIVER_REQUIRE_FIRMWARE_CRC_ITU_T, &rt2x00dev->flags);
/*
* Set the rssi offset.
@ -2061,6 +2078,7 @@ static const struct ieee80211_ops rt73usb_mac80211_ops = {
static const struct rt2x00lib_ops rt73usb_rt2x00_ops = {
.probe_hw = rt73usb_probe_hw,
.get_firmware_name = rt73usb_get_firmware_name,
.get_firmware_crc = rt73usb_get_firmware_crc,
.load_firmware = rt73usb_load_firmware,
.initialize = rt2x00usb_initialize,
.uninitialize = rt2x00usb_uninitialize,