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Commit e757201b authored by George Spelvin's avatar George Spelvin Committed by John W. Linville
Browse files

drivers/net/wireless/ti/wl*/spi.c: Simplify CRC computation 



These devices require commands stored in buffers in an odd order,
different from that in which the CRC is computed.

Rather than make two copies of the commands in two different orders,
form the commands in logical (CRC) order, append the CRC, then byte-swap
in place to the desired order.

The old code worked fine, I'm just scratching an "ugh, that's ugly"
itch.

Signed-off-by: default avatarGeorge Spelvin <linux@horizon.com>
Reviewed-by: default avatarPavel Machek <pavel@ucw.cz>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 9b60fa4a

drivers/net/wireless/ti/wl1251/spi.c

+21 −22
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <linux/irq.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/swab.h>

#include <linux/crc7.h>

#include <linux/spi/spi.h>

#include <linux/wl12xx.h>
@@ -83,46 +84,44 @@ static void wl1251_spi_reset(struct wl1251 *wl) 


static void wl1251_spi_wake(struct wl1251 *wl)

{

	u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd;

	struct spi_transfer t;

	struct spi_message m;

	u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);



	cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);

	if (!cmd) {

		wl1251_error("could not allocate cmd for spi init");

		return;

	}



	memset(crc, 0, sizeof(crc));

	memset(&t, 0, sizeof(t));

	spi_message_init(&m);



	/* Set WSPI_INIT_COMMAND

	 * the data is being send from the MSB to LSB

	 */

	cmd[2] = 0xff;

	cmd[3] = 0xff;

	cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;

	cmd[0] = 0;

	cmd[7] = 0;

	cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3;

	cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;

	cmd[0] = 0xff;

	cmd[1] = 0xff;

	cmd[2] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;

	cmd[3] = 0;

	cmd[4] = 0;

	cmd[5] = HW_ACCESS_WSPI_INIT_CMD_MASK << 3;

	cmd[5] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;



	cmd[6] = WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS

		| WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;



	if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)

		cmd[5] |=  WSPI_INIT_CMD_DIS_FIXEDBUSY;

		cmd[6] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;

	else

		cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY;



	cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS

		| WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;

		cmd[6] |= WSPI_INIT_CMD_EN_FIXEDBUSY;



	crc[0] = cmd[1];

	crc[1] = cmd[0];

	crc[2] = cmd[7];

	crc[3] = cmd[6];

	crc[4] = cmd[5];



	cmd[4] = crc7_be(0, crc, WSPI_INIT_CMD_CRC_LEN) | WSPI_INIT_CMD_END;

	cmd[7] = crc7_be(0, cmd+2, WSPI_INIT_CMD_CRC_LEN) | WSPI_INIT_CMD_END;

	/*

	 * The above is the logical order; it must actually be stored

	 * in the buffer byte-swapped.

	 */

	__swab32s((u32 *)cmd);

	__swab32s((u32 *)cmd+1);



	t.tx_buf = cmd;

	t.len = WSPI_INIT_CMD_LEN;

drivers/net/wireless/ti/wlcore/spi.c

+22 −23
Original line number Diff line number Diff line
@@ -24,11 +24,12 @@ 
#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/swab.h>

#include <linux/crc7.h>

#include <linux/spi/spi.h>

#include <linux/wl12xx.h>

#include <linux/platform_device.h>

#include <linux/slab.h>



#include "wlcore.h"

#include "wl12xx_80211.h"
@@ -110,18 +111,16 @@ static void wl12xx_spi_reset(struct device *child) 
static void wl12xx_spi_init(struct device *child)

{

	struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);

	u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd;

	struct spi_transfer t;

	struct spi_message m;

	u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);



	cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);

	if (!cmd) {

		dev_err(child->parent,

			"could not allocate cmd for spi init\n");

		return;

	}



	memset(crc, 0, sizeof(crc));

	memset(&t, 0, sizeof(t));

	spi_message_init(&m);
@@ -129,29 +128,29 @@ static void wl12xx_spi_init(struct device *child) 
	 * Set WSPI_INIT_COMMAND

	 * the data is being send from the MSB to LSB

	 */

	cmd[2] = 0xff;

	cmd[3] = 0xff;

	cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;

	cmd[0] = 0;

	cmd[7] = 0;

	cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3;

	cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;

	cmd[0] = 0xff;

	cmd[1] = 0xff;

	cmd[2] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;

	cmd[3] = 0;

	cmd[4] = 0;

	cmd[5] = HW_ACCESS_WSPI_INIT_CMD_MASK << 3;

	cmd[5] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;



	cmd[6] = WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS

		| WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;



	if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)

		cmd[5] |=  WSPI_INIT_CMD_DIS_FIXEDBUSY;

		cmd[6] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;

	else

		cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY;

		cmd[6] |= WSPI_INIT_CMD_EN_FIXEDBUSY;



	cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS

		| WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;



	crc[0] = cmd[1];

	crc[1] = cmd[0];

	crc[2] = cmd[7];

	crc[3] = cmd[6];

	crc[4] = cmd[5];



	cmd[4] = crc7_be(0, crc, WSPI_INIT_CMD_CRC_LEN) | WSPI_INIT_CMD_END;

	cmd[7] = crc7_be(0, cmd+2, WSPI_INIT_CMD_CRC_LEN) | WSPI_INIT_CMD_END;

	/*

	 * The above is the logical order; it must actually be stored

	 * in the buffer byte-swapped.

	 */

	__swab32s((u32 *)cmd);

	__swab32s((u32 *)cmd+1);



	t.tx_buf = cmd;

	t.len = WSPI_INIT_CMD_LEN;