Search Linux Wireless

Re: [PATCH v3] libertas: if_spi, driver for libertas GSPI devices

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Fri, 2009-01-09 at 14:58 -0800, Colin McCabe wrote:
> Add initial support for libertas devices using a GSPI interface.  This has
> been tested with the 8686.
> 
> GSPI is intended to be used on embedded systems. Board-specific parameters are
> required (see libertas_spi.h).
> 
> Thanks to everyone who took a look at the earlier versions of the patch.

Thanks!  Looks good.

Acked-by: Dan Williams <dcbw@xxxxxxxxxx>

> Changes in v3:
> * Get rid of out-of-date TODO comment about if_spi_e2h
> * Look for firmware images in libertas/gspi8XXX_hlp.bin and 
> libertas/gspi8XXX.bin 
> * Fix spi_read / spi_write error handling in spu_read / spu_write
> * Consolidate multiple spi_read / spi_write operations into one to
> improve performance
> * Add dependency on GENERIC_GPIO
> 
> Changes in v2:
> * Store the host IRQ setting in spi->irq rather than creating a new variable
> for this purpose.
> * Add TODO comment to declaration of card->gpio_cs.
> (We do intend to get rid of gpio_cs eventually, but it will require some
> changes to the generic SPI layer, which could take a while.)
> * When loading the module, check to see if the firmware is already loaded. If
> so, skip firmware load.
> * Speed up module load time slightly.
> * Add if_spi_e2h to handle libertas card events.
> * Include relevant Kconfig change.
> 
> Cheers.
> Colin
> Signed-off-by: Colin McCabe <colin@xxxxxxxxxxx>
> Signed-off-by: Andrey Yurovsky <andrey@xxxxxxxxxxx>
> ---
>  drivers/net/wireless/Kconfig           |    6 +
>  drivers/net/wireless/libertas/Makefile |    2 +
>  drivers/net/wireless/libertas/defs.h   |    2 +
>  drivers/net/wireless/libertas/if_spi.c | 1204 ++++++++++++++++++++++++++++++++
>  drivers/net/wireless/libertas/if_spi.h |  208 ++++++
>  include/linux/spi/libertas_spi.h       |   25 +
>  6 files changed, 1447 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/net/wireless/libertas/if_spi.c
>  create mode 100644 drivers/net/wireless/libertas/if_spi.h
>  create mode 100644 include/linux/spi/libertas_spi.h
> 
> diff --git a/drivers/net/wireless/Kconfig b/drivers/net/wireless/Kconfig
> index ea543fc..6f9ee26 100644
> --- a/drivers/net/wireless/Kconfig
> +++ b/drivers/net/wireless/Kconfig
> @@ -151,6 +151,12 @@ config LIBERTAS_SDIO
>  	---help---
>  	  A driver for Marvell Libertas 8385 and 8686 SDIO devices.
>  
> +config LIBERTAS_SPI
> +	tristate "Marvell Libertas 8686 SPI 802.11b/g cards"
> +	depends on LIBERTAS && SPI && GENERIC_GPIO
> +	---help---
> +	  A driver for Marvell Libertas 8686 SPI devices.
> +
>  config LIBERTAS_DEBUG
>  	bool "Enable full debugging output in the Libertas module."
>  	depends on LIBERTAS
> diff --git a/drivers/net/wireless/libertas/Makefile b/drivers/net/wireless/libertas/Makefile
> index 02080a3..0b69185 100644
> --- a/drivers/net/wireless/libertas/Makefile
> +++ b/drivers/net/wireless/libertas/Makefile
> @@ -4,8 +4,10 @@ libertas-objs := main.o wext.o rx.o tx.o cmd.o cmdresp.o scan.o 11d.o	\
>  usb8xxx-objs += if_usb.o
>  libertas_cs-objs += if_cs.o
>  libertas_sdio-objs += if_sdio.o
> +libertas_spi-objs += if_spi.o
>  
>  obj-$(CONFIG_LIBERTAS)     += libertas.o
>  obj-$(CONFIG_LIBERTAS_USB) += usb8xxx.o
>  obj-$(CONFIG_LIBERTAS_CS)  += libertas_cs.o
>  obj-$(CONFIG_LIBERTAS_SDIO) += libertas_sdio.o
> +obj-$(CONFIG_LIBERTAS_SPI) += libertas_spi.o
> diff --git a/drivers/net/wireless/libertas/defs.h b/drivers/net/wireless/libertas/defs.h
> index b7744d6..0d1494f 100644
> --- a/drivers/net/wireless/libertas/defs.h
> +++ b/drivers/net/wireless/libertas/defs.h
> @@ -41,6 +41,7 @@
>  #define LBS_DEB_HEX	0x00200000
>  #define LBS_DEB_SDIO	0x00400000
>  #define LBS_DEB_SYSFS	0x00800000
> +#define LBS_DEB_SPI	0x01000000
>  
>  extern unsigned int lbs_debug;
>  
> @@ -84,6 +85,7 @@ do { if ((lbs_debug & (grp)) == (grp)) \
>  #define lbs_deb_thread(fmt, args...)    LBS_DEB_LL(LBS_DEB_THREAD, " thread", fmt, ##args)
>  #define lbs_deb_sdio(fmt, args...)      LBS_DEB_LL(LBS_DEB_SDIO, " sdio", fmt, ##args)
>  #define lbs_deb_sysfs(fmt, args...)     LBS_DEB_LL(LBS_DEB_SYSFS, " sysfs", fmt, ##args)
> +#define lbs_deb_spi(fmt, args...)       LBS_DEB_LL(LBS_DEB_SPI, " spi", fmt, ##args)
>  
>  #define lbs_pr_info(format, args...) \
>  	printk(KERN_INFO DRV_NAME": " format, ## args)
> diff --git a/drivers/net/wireless/libertas/if_spi.c b/drivers/net/wireless/libertas/if_spi.c
> new file mode 100644
> index 0000000..86b984e
> --- /dev/null
> +++ b/drivers/net/wireless/libertas/if_spi.c
> @@ -0,0 +1,1204 @@
> +/*
> + *	linux/drivers/net/wireless/libertas/if_spi.c
> + *
> + *	Driver for Marvell SPI WLAN cards.
> + *
> + *	Copyright 2008 Analog Devices Inc.
> + *
> + *	Authors:
> + *	Andrey Yurovsky <andrey@xxxxxxxxxxx>
> + *	Colin McCabe <colin@xxxxxxxxxxx>
> + *
> + *	Inspired by if_sdio.c, Copyright 2007-2008 Pierre Ossman
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#include <linux/moduleparam.h>
> +#include <linux/firmware.h>
> +#include <linux/gpio.h>
> +#include <linux/jiffies.h>
> +#include <linux/kthread.h>
> +#include <linux/list.h>
> +#include <linux/netdevice.h>
> +#include <linux/spi/libertas_spi.h>
> +#include <linux/spi/spi.h>
> +
> +#include "host.h"
> +#include "decl.h"
> +#include "defs.h"
> +#include "dev.h"
> +#include "if_spi.h"
> +
> +struct if_spi_packet {
> +	struct list_head		list;
> +	u16				blen;
> +	u8				buffer[0] __attribute__((aligned(4)));
> +};
> +
> +struct if_spi_card {
> +	struct spi_device		*spi;
> +	struct lbs_private		*priv;
> +
> +	char				helper_fw_name[FIRMWARE_NAME_MAX];
> +	char				main_fw_name[FIRMWARE_NAME_MAX];
> +
> +	/* The card ID and card revision, as reported by the hardware. */
> +	u16				card_id;
> +	u8				card_rev;
> +
> +	/* Pin number for our GPIO chip-select. */
> +	/* TODO: Once the generic SPI layer has some additional features, we
> +	 * should take this out and use the normal chip select here.
> +	 * We need support for chip select delays, and not dropping chipselect
> +	 * after each word. */
> +	int				gpio_cs;
> +
> +	/* The last time that we initiated an SPU operation */
> +	unsigned long			prev_xfer_time;
> +
> +	int				use_dummy_writes;
> +	unsigned long			spu_port_delay;
> +	unsigned long			spu_reg_delay;
> +
> +	/* Handles all SPI communication (except for FW load) */
> +	struct task_struct		*spi_thread;
> +	int				run_thread;
> +
> +	/* Used to wake up the spi_thread */
> +	struct semaphore		spi_ready;
> +	struct semaphore		spi_thread_terminated;
> +
> +	u8				cmd_buffer[IF_SPI_CMD_BUF_SIZE];
> +
> +	/* A buffer of incoming packets from libertas core.
> +	 * Since we can't sleep in hw_host_to_card, we have to buffer
> +	 * them. */
> +	struct list_head		cmd_packet_list;
> +	struct list_head		data_packet_list;
> +
> +	/* Protects cmd_packet_list and data_packet_list */
> +	spinlock_t			buffer_lock;
> +};
> +
> +static void free_if_spi_card(struct if_spi_card *card)
> +{
> +	struct list_head *cursor, *next;
> +	struct if_spi_packet *packet;
> +
> +	BUG_ON(card->run_thread);
> +	list_for_each_safe(cursor, next, &card->cmd_packet_list) {
> +		packet = container_of(cursor, struct if_spi_packet, list);
> +		list_del(&packet->list);
> +		kfree(packet);
> +	}
> +	list_for_each_safe(cursor, next, &card->data_packet_list) {
> +		packet = container_of(cursor, struct if_spi_packet, list);
> +		list_del(&packet->list);
> +		kfree(packet);
> +	}
> +	spi_set_drvdata(card->spi, NULL);
> +	kfree(card);
> +}
> +
> +static struct chip_ident chip_id_to_device_name[] = {
> +	{ .chip_id = 0x04, .name = 8385 },
> +	{ .chip_id = 0x0b, .name = 8686 },
> +};
> +
> +/*
> + * SPI Interface Unit Routines
> + *
> + * The SPU sits between the host and the WLAN module.
> + * All communication with the firmware is through SPU transactions.
> + *
> + * First we have to put a SPU register name on the bus. Then we can
> + * either read from or write to that register.
> + *
> + * For 16-bit transactions, byte order on the bus is big-endian.
> + * We don't have to worry about that here, though.
> + * The translation takes place in the SPI routines.
> + */
> +
> +static void spu_transaction_init(struct if_spi_card *card)
> +{
> +	if (!time_after(jiffies, card->prev_xfer_time + 1)) {
> +		/* Unfortunately, the SPU requires a delay between successive
> +		 * transactions. If our last transaction was more than a jiffy
> +		 * ago, we have obviously already delayed enough.
> +		 * If not, we have to busy-wait to be on the safe side. */
> +		ndelay(400);
> +	}
> +	gpio_set_value(card->gpio_cs, 0); /* assert CS */
> +}
> +
> +static void spu_transaction_finish(struct if_spi_card *card)
> +{
> +	gpio_set_value(card->gpio_cs, 1); /* drop CS */
> +	card->prev_xfer_time = jiffies;
> +}
> +
> +/* Write out a byte buffer to an SPI register,
> + * using a series of 16-bit transfers. */
> +static int spu_write(struct if_spi_card *card, u16 reg, const u8 *buf, int len)
> +{
> +	int err = 0;
> +	u16 reg_out = reg | IF_SPI_WRITE_OPERATION_MASK;
> +
> +	/* You must give an even number of bytes to the SPU, even if it
> +	 * doesn't care about the last one.  */
> +	BUG_ON(len & 0x1);
> +
> +	spu_transaction_init(card);
> +
> +	/* write SPU register index */
> +	err = spi_write(card->spi, (u8 *)&reg_out, sizeof(u16));
> +	if (err)
> +		goto out;
> +
> +	err = spi_write(card->spi, buf, len);
> +
> +out:
> +	spu_transaction_finish(card);
> +	return err;
> +}
> +
> +static inline int spu_write_u16(struct if_spi_card *card, u16 reg, u16 val)
> +{
> +	return spu_write(card, reg, (u8 *)&val, sizeof(u16));
> +}
> +
> +static inline int spu_write_u32(struct if_spi_card *card, u16 reg, u32 val)
> +{
> +	/* The lower 16 bits are written first. */
> +	u16 out[2];
> +	out[0] = val & 0xffff;
> +	out[1] = (val & 0xffff0000) >> 16;
> +	return spu_write(card, reg, (u8 *)&out, sizeof(u32));
> +}
> +
> +static inline int spu_reg_is_port_reg(u16 reg)
> +{
> +	switch (reg) {
> +	case IF_SPI_IO_RDWRPORT_REG:
> +	case IF_SPI_CMD_RDWRPORT_REG:
> +	case IF_SPI_DATA_RDWRPORT_REG:
> +		return 1;
> +	default:
> +		return 0;
> +	}
> +}
> +
> +static int spu_read(struct if_spi_card *card, u16 reg, u8 *buf, int len)
> +{
> +	unsigned int i, delay;
> +	int err = 0;
> +	u16 zero = 0;
> +	u16 reg_out = reg | IF_SPI_READ_OPERATION_MASK;
> +
> +	/* You must take an even number of bytes from the SPU, even if you
> +	 * don't care about the last one.  */
> +	BUG_ON(len & 0x1);
> +
> +	spu_transaction_init(card);
> +
> +	/* write SPU register index */
> +	err = spi_write(card->spi, (u8 *)&reg_out, sizeof(u16));
> +	if (err)
> +		goto out;
> +
> +	delay = spu_reg_is_port_reg(reg) ? card->spu_port_delay :
> +						card->spu_reg_delay;
> +	if (card->use_dummy_writes) {
> +		/* Clock in dummy cycles while the SPU fills the FIFO */
> +		for (i = 0; i < delay / 16; ++i) {
> +			err = spi_write(card->spi, (u8 *)&zero, sizeof(u16));
> +			if (err)
> +				return err;
> +		}
> +	} else {
> +		/* Busy-wait while the SPU fills the FIFO */
> +		ndelay(100 + (delay * 10));
> +	}
> +
> +	/* read in data */
> +	err = spi_read(card->spi, buf, len);
> +
> +out:
> +	spu_transaction_finish(card);
> +	return err;
> +}
> +
> +/* Read 16 bits from an SPI register */
> +static inline int spu_read_u16(struct if_spi_card *card, u16 reg, u16 *val)
> +{
> +	return spu_read(card, reg, (u8 *)val, sizeof(u16));
> +}
> +
> +/* Read 32 bits from an SPI register.
> + * The low 16 bits are read first. */
> +static int spu_read_u32(struct if_spi_card *card, u16 reg, u32 *val)
> +{
> +	u16 buf[2];
> +	int err;
> +	err = spu_read(card, reg, (u8 *)buf, sizeof(u32));
> +	if (!err)
> +		*val = buf[0] | (buf[1] << 16);
> +	return err;
> +}
> +
> +/* Keep reading 16 bits from an SPI register until you get the correct result.
> + *
> + * If mask = 0, the correct result is any non-zero number.
> + * If mask != 0, the correct result is any number where
> + * number & target_mask == target
> + *
> + * Returns -ETIMEDOUT if a second passes without the correct result. */
> +static int spu_wait_for_u16(struct if_spi_card *card, u16 reg,
> +			u16 target_mask, u16 target)
> +{
> +	int err;
> +	unsigned long timeout = jiffies + 5*HZ;
> +	while (1) {
> +		u16 val;
> +		err = spu_read_u16(card, reg, &val);
> +		if (err)
> +			return err;
> +		if (target_mask) {
> +			if ((val & target_mask) == target)
> +				return 0;
> +		} else {
> +			if (val)
> +				return 0;
> +		}
> +		udelay(100);
> +		if (time_after(jiffies, timeout)) {
> +			lbs_pr_err("%s: timeout with val=%02x, "
> +			       "target_mask=%02x, target=%02x\n",
> +			       __func__, val, target_mask, target);
> +			return -ETIMEDOUT;
> +		}
> +	}
> +}
> +
> +/* Read 16 bits from an SPI register until you receive a specific value.
> + * Returns -ETIMEDOUT if a 4 tries pass without success. */
> +static int spu_wait_for_u32(struct if_spi_card *card, u32 reg, u32 target)
> +{
> +	int err, try;
> +	for (try = 0; try < 4; ++try) {
> +		u32 val = 0;
> +		err = spu_read_u32(card, reg, &val);
> +		if (err)
> +			return err;
> +		if (val == target)
> +			return 0;
> +		mdelay(100);
> +	}
> +	return -ETIMEDOUT;
> +}
> +
> +static int spu_set_interrupt_mode(struct if_spi_card *card,
> +			   int suppress_host_int,
> +			   int auto_int)
> +{
> +	int err = 0;
> +
> +	/* We can suppress a host interrupt by clearing the appropriate
> +	 * bit in the "host interrupt status mask" register */
> +	if (suppress_host_int) {
> +		err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_MASK_REG, 0);
> +		if (err)
> +			return err;
> +	} else {
> +		err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_MASK_REG,
> +			      IF_SPI_HISM_TX_DOWNLOAD_RDY |
> +			      IF_SPI_HISM_RX_UPLOAD_RDY |
> +			      IF_SPI_HISM_CMD_DOWNLOAD_RDY |
> +			      IF_SPI_HISM_CARDEVENT |
> +			      IF_SPI_HISM_CMD_UPLOAD_RDY);
> +		if (err)
> +			return err;
> +	}
> +
> +	/* If auto-interrupts are on, the completion of certain transactions
> +	 * will trigger an interrupt automatically. If auto-interrupts
> +	 * are off, we need to set the "Card Interrupt Cause" register to
> +	 * trigger a card interrupt. */
> +	if (auto_int) {
> +		err = spu_write_u16(card, IF_SPI_HOST_INT_CTRL_REG,
> +				IF_SPI_HICT_TX_DOWNLOAD_OVER_AUTO |
> +				IF_SPI_HICT_RX_UPLOAD_OVER_AUTO |
> +				IF_SPI_HICT_CMD_DOWNLOAD_OVER_AUTO |
> +				IF_SPI_HICT_CMD_UPLOAD_OVER_AUTO);
> +		if (err)
> +			return err;
> +	} else {
> +		err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_MASK_REG, 0);
> +		if (err)
> +			return err;
> +	}
> +	return err;
> +}
> +
> +static int spu_get_chip_revision(struct if_spi_card *card,
> +				  u16 *card_id, u8 *card_rev)
> +{
> +	int err = 0;
> +	u32 dev_ctrl;
> +	err = spu_read_u32(card, IF_SPI_DEVICEID_CTRL_REG, &dev_ctrl);
> +	if (err)
> +		return err;
> +	*card_id = IF_SPI_DEVICEID_CTRL_REG_TO_CARD_ID(dev_ctrl);
> +	*card_rev = IF_SPI_DEVICEID_CTRL_REG_TO_CARD_REV(dev_ctrl);
> +	return err;
> +}
> +
> +static int spu_set_bus_mode(struct if_spi_card *card, u16 mode)
> +{
> +	int err = 0;
> +	u16 rval;
> +	/* set bus mode */
> +	err = spu_write_u16(card, IF_SPI_SPU_BUS_MODE_REG, mode);
> +	if (err)
> +		return err;
> +	/* Check that we were able to read back what we just wrote. */
> +	err = spu_read_u16(card, IF_SPI_SPU_BUS_MODE_REG, &rval);
> +	if (err)
> +		return err;
> +	if (rval != mode) {
> +		lbs_pr_err("Can't read bus mode register.\n");
> +		return -EIO;
> +	}
> +	return 0;
> +}
> +
> +static int spu_init(struct if_spi_card *card, int use_dummy_writes)
> +{
> +	int err = 0;
> +	u32 delay;
> +
> +	/* We have to start up in timed delay mode so that we can safely
> +	 * read the Delay Read Register. */
> +	card->use_dummy_writes = 0;
> +	err = spu_set_bus_mode(card,
> +				IF_SPI_BUS_MODE_SPI_CLOCK_PHASE_RISING |
> +				IF_SPI_BUS_MODE_DELAY_METHOD_TIMED |
> +				IF_SPI_BUS_MODE_16_BIT_ADDRESS_16_BIT_DATA);
> +	if (err)
> +		return err;
> +	card->spu_port_delay = 1000;
> +	card->spu_reg_delay = 1000;
> +	err = spu_read_u32(card, IF_SPI_DELAY_READ_REG, &delay);
> +	if (err)
> +		return err;
> +	card->spu_port_delay = delay & 0x0000ffff;
> +	card->spu_reg_delay = (delay & 0xffff0000) >> 16;
> +
> +	/* If dummy clock delay mode has been requested, switch to it now */
> +	if (use_dummy_writes) {
> +		card->use_dummy_writes = 1;
> +		err = spu_set_bus_mode(card,
> +				IF_SPI_BUS_MODE_SPI_CLOCK_PHASE_RISING |
> +				IF_SPI_BUS_MODE_DELAY_METHOD_DUMMY_CLOCK |
> +				IF_SPI_BUS_MODE_16_BIT_ADDRESS_16_BIT_DATA);
> +		if (err)
> +			return err;
> +	}
> +
> +	lbs_deb_spi("Initialized SPU unit. "
> +		    "spu_port_delay=0x%04lx, spu_reg_delay=0x%04lx\n",
> +		    card->spu_port_delay, card->spu_reg_delay);
> +	return err;
> +}
> +
> +/*
> + * Firmware Loading
> + */
> +
> +static int if_spi_prog_helper_firmware(struct if_spi_card *card)
> +{
> +	int err = 0;
> +	const struct firmware *firmware = NULL;
> +	int bytes_remaining;
> +	const u8 *fw;
> +	u8 temp[HELPER_FW_LOAD_CHUNK_SZ];
> +	struct spi_device *spi = card->spi;
> +
> +	lbs_deb_enter(LBS_DEB_SPI);
> +
> +	err = spu_set_interrupt_mode(card, 1, 0);
> +	if (err)
> +		goto out;
> +	/* Get helper firmware image */
> +	err = request_firmware(&firmware, card->helper_fw_name, &spi->dev);
> +	if (err) {
> +		lbs_pr_err("request_firmware failed with err = %d\n", err);
> +		goto out;
> +	}
> +	bytes_remaining = firmware->size;
> +	fw = firmware->data;
> +
> +	/* Load helper firmware image */
> +	while (bytes_remaining > 0) {
> +		/* Scratch pad 1 should contain the number of bytes we
> +		 * want to download to the firmware */
> +		err = spu_write_u16(card, IF_SPI_SCRATCH_1_REG,
> +					HELPER_FW_LOAD_CHUNK_SZ);
> +		if (err)
> +			goto release_firmware;
> +
> +		err = spu_wait_for_u16(card, IF_SPI_HOST_INT_STATUS_REG,
> +					IF_SPI_HIST_CMD_DOWNLOAD_RDY,
> +					IF_SPI_HIST_CMD_DOWNLOAD_RDY);
> +		if (err)
> +			goto release_firmware;
> +
> +		/* Feed the data into the command read/write port reg
> +		 * in chunks of 64 bytes */
> +		memset(temp, 0, sizeof(temp));
> +		memcpy(temp, fw,
> +		       min(bytes_remaining, HELPER_FW_LOAD_CHUNK_SZ));
> +		mdelay(10);
> +		err = spu_write(card, IF_SPI_CMD_RDWRPORT_REG,
> +					temp, HELPER_FW_LOAD_CHUNK_SZ);
> +		if (err)
> +			goto release_firmware;
> +
> +		/* Interrupt the boot code */
> +		err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG, 0);
> +		if (err)
> +			goto release_firmware;
> +		err = spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG,
> +				       IF_SPI_CIC_CMD_DOWNLOAD_OVER);
> +		if (err)
> +			goto release_firmware;
> +		bytes_remaining -= HELPER_FW_LOAD_CHUNK_SZ;
> +		fw += HELPER_FW_LOAD_CHUNK_SZ;
> +	}
> +
> +	/* Once the helper / single stage firmware download is complete,
> +	 * write 0 to scratch pad 1 and interrupt the
> +	 * bootloader. This completes the helper download. */
> +	err = spu_write_u16(card, IF_SPI_SCRATCH_1_REG, FIRMWARE_DNLD_OK);
> +	if (err)
> +		goto release_firmware;
> +	err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG, 0);
> +	if (err)
> +		goto release_firmware;
> +	err = spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG,
> +				IF_SPI_CIC_CMD_DOWNLOAD_OVER);
> +		goto release_firmware;
> +
> +	lbs_deb_spi("waiting for helper to boot...\n");
> +
> +release_firmware:
> +	release_firmware(firmware);
> +out:
> +	if (err)
> +		lbs_pr_err("failed to load helper firmware (err=%d)\n", err);
> +	lbs_deb_leave_args(LBS_DEB_SPI, "err %d", err);
> +	return err;
> +}
> +
> +/* Returns the length of the next packet the firmware expects us to send
> + * Sets crc_err if the previous transfer had a CRC error. */
> +static int if_spi_prog_main_firmware_check_len(struct if_spi_card *card,
> +						int *crc_err)
> +{
> +	u16 len;
> +	int err = 0;
> +
> +	/* wait until the host interrupt status register indicates
> +	 * that we are ready to download */
> +	err = spu_wait_for_u16(card, IF_SPI_HOST_INT_STATUS_REG,
> +				IF_SPI_HIST_CMD_DOWNLOAD_RDY,
> +				IF_SPI_HIST_CMD_DOWNLOAD_RDY);
> +	if (err) {
> +		lbs_pr_err("timed out waiting for host_int_status\n");
> +		return err;
> +	}
> +
> +	/* Ask the device how many bytes of firmware it wants. */
> +	err = spu_read_u16(card, IF_SPI_SCRATCH_1_REG, &len);
> +	if (err)
> +		return err;
> +
> +	if (len > IF_SPI_CMD_BUF_SIZE) {
> +		lbs_pr_err("firmware load device requested a larger "
> +			   "tranfer than we are prepared to "
> +			   "handle. (len = %d)\n", len);
> +		return -EIO;
> +	}
> +	if (len & 0x1) {
> +		lbs_deb_spi("%s: crc error\n", __func__);
> +		len &= ~0x1;
> +		*crc_err = 1;
> +	} else
> +		*crc_err = 0;
> +
> +	return len;
> +}
> +
> +static int if_spi_prog_main_firmware(struct if_spi_card *card)
> +{
> +	int len, prev_len;
> +	int bytes, crc_err = 0, err = 0;
> +	const struct firmware *firmware = NULL;
> +	const u8 *fw;
> +	struct spi_device *spi = card->spi;
> +	u16 num_crc_errs;
> +
> +	lbs_deb_enter(LBS_DEB_SPI);
> +
> +	err = spu_set_interrupt_mode(card, 1, 0);
> +	if (err)
> +		goto out;
> +
> +	/* Get firmware image */
> +	err = request_firmware(&firmware, card->main_fw_name, &spi->dev);
> +	if (err) {
> +		lbs_pr_err("%s: can't get firmware '%s' from kernel. "
> +			"err = %d\n", __func__, card->main_fw_name, err);
> +		goto out;
> +	}
> +
> +	err = spu_wait_for_u16(card, IF_SPI_SCRATCH_1_REG, 0, 0);
> +	if (err) {
> +		lbs_pr_err("%s: timed out waiting for initial "
> +			   "scratch reg = 0\n", __func__);
> +		goto release_firmware;
> +	}
> +
> +	num_crc_errs = 0;
> +	prev_len = 0;
> +	bytes = firmware->size;
> +	fw = firmware->data;
> +	while ((len = if_spi_prog_main_firmware_check_len(card, &crc_err))) {
> +		if (len < 0) {
> +			err = len;
> +			goto release_firmware;
> +		}
> +		if (bytes < 0) {
> +			/* If there are no more bytes left, we would normally
> +			 * expect to have terminated with len = 0 */
> +			lbs_pr_err("Firmware load wants more bytes "
> +				   "than we have to offer.\n");
> +			break;
> +		}
> +		if (crc_err) {
> +			/* Previous transfer failed. */
> +			if (++num_crc_errs > MAX_MAIN_FW_LOAD_CRC_ERR) {
> +				lbs_pr_err("Too many CRC errors encountered "
> +					   "in firmware load.\n");
> +				err = -EIO;
> +				goto release_firmware;
> +			}
> +		} else {
> +			/* Previous transfer succeeded. Advance counters. */
> +			bytes -= prev_len;
> +			fw += prev_len;
> +		}
> +		if (bytes < len) {
> +			memset(card->cmd_buffer, 0, len);
> +			memcpy(card->cmd_buffer, fw, bytes);
> +		} else
> +			memcpy(card->cmd_buffer, fw, len);
> +
> +		err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG, 0);
> +		if (err)
> +			goto release_firmware;
> +		err = spu_write(card, IF_SPI_CMD_RDWRPORT_REG,
> +				card->cmd_buffer, len);
> +		if (err)
> +			goto release_firmware;
> +		err = spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG ,
> +					IF_SPI_CIC_CMD_DOWNLOAD_OVER);
> +		if (err)
> +			goto release_firmware;
> +		prev_len = len;
> +	}
> +	if (bytes > prev_len) {
> +		lbs_pr_err("firmware load wants fewer bytes than "
> +			   "we have to offer.\n");
> +	}
> +
> +	/* Confirm firmware download */
> +	err = spu_wait_for_u32(card, IF_SPI_SCRATCH_4_REG,
> +					SUCCESSFUL_FW_DOWNLOAD_MAGIC);
> +	if (err) {
> +		lbs_pr_err("failed to confirm the firmware download\n");
> +		goto release_firmware;
> +	}
> +
> +release_firmware:
> +	release_firmware(firmware);
> +
> +out:
> +	if (err)
> +		lbs_pr_err("failed to load firmware (err=%d)\n", err);
> +	lbs_deb_leave_args(LBS_DEB_SPI, "err %d", err);
> +	return err;
> +}
> +
> +/*
> + * SPI Transfer Thread
> + *
> + * The SPI thread handles all SPI transfers, so there is no need for a lock.
> + */
> +
> +/* Move a command from the card to the host */
> +static int if_spi_c2h_cmd(struct if_spi_card *card)
> +{
> +	struct lbs_private *priv = card->priv;
> +	unsigned long flags;
> +	int err = 0;
> +	u16 len;
> +	u8 i;
> +
> +	/* We need a buffer big enough to handle whatever people send to
> +	 * hw_host_to_card */
> +	BUILD_BUG_ON(IF_SPI_CMD_BUF_SIZE < LBS_CMD_BUFFER_SIZE);
> +	BUILD_BUG_ON(IF_SPI_CMD_BUF_SIZE < LBS_UPLD_SIZE);
> +
> +	/* It's just annoying if the buffer size isn't a multiple of 4, because
> +	 * then we might have len <  IF_SPI_CMD_BUF_SIZE but
> +	 * ALIGN(len, 4) > IF_SPI_CMD_BUF_SIZE */
> +	BUILD_BUG_ON(IF_SPI_CMD_BUF_SIZE % 4 != 0);
> +
> +	lbs_deb_enter(LBS_DEB_SPI);
> +
> +	/* How many bytes are there to read? */
> +	err = spu_read_u16(card, IF_SPI_SCRATCH_2_REG, &len);
> +	if (err)
> +		goto out;
> +	if (!len) {
> +		lbs_pr_err("%s: error: card has no data for host\n",
> +			   __func__);
> +		err = -EINVAL;
> +		goto out;
> +	} else if (len > IF_SPI_CMD_BUF_SIZE) {
> +		lbs_pr_err("%s: error: response packet too large: "
> +			   "%d bytes, but maximum is %d\n",
> +			   __func__, len, IF_SPI_CMD_BUF_SIZE);
> +		err = -EINVAL;
> +		goto out;
> +	}
> +
> +	/* Read the data from the WLAN module into our command buffer */
> +	err = spu_read(card, IF_SPI_CMD_RDWRPORT_REG,
> +				card->cmd_buffer, ALIGN(len, 4));
> +	if (err)
> +		goto out;
> +
> +	spin_lock_irqsave(&priv->driver_lock, flags);
> +	i = (priv->resp_idx == 0) ? 1 : 0;
> +	BUG_ON(priv->resp_len[i]);
> +	priv->resp_len[i] = len;
> +	memcpy(priv->resp_buf[i], card->cmd_buffer, len);
> +	lbs_notify_command_response(priv, i);
> +	spin_unlock_irqrestore(&priv->driver_lock, flags);
> +
> +out:
> +	if (err)
> +		lbs_pr_err("%s: err=%d\n", __func__, err);
> +	lbs_deb_leave(LBS_DEB_SPI);
> +	return err;
> +}
> +
> +/* Move data from the card to the host */
> +static int if_spi_c2h_data(struct if_spi_card *card)
> +{
> +	struct sk_buff *skb;
> +	char *data;
> +	u16 len;
> +	int err = 0;
> +
> +	lbs_deb_enter(LBS_DEB_SPI);
> +
> +	/* How many bytes are there to read? */
> +	err = spu_read_u16(card, IF_SPI_SCRATCH_1_REG, &len);
> +	if (err)
> +		goto out;
> +	if (!len) {
> +		lbs_pr_err("%s: error: card has no data for host\n",
> +			   __func__);
> +		err = -EINVAL;
> +		goto out;
> +	} else if (len > MRVDRV_ETH_RX_PACKET_BUFFER_SIZE) {
> +		lbs_pr_err("%s: error: card has %d bytes of data, but "
> +			   "our maximum skb size is %u\n",
> +			   __func__, len, MRVDRV_ETH_RX_PACKET_BUFFER_SIZE);
> +		err = -EINVAL;
> +		goto out;
> +	}
> +
> +	/* TODO: should we allocate a smaller skb if we have less data? */
> +	skb = dev_alloc_skb(MRVDRV_ETH_RX_PACKET_BUFFER_SIZE);
> +	if (!skb) {
> +		err = -ENOBUFS;
> +		goto out;
> +	}
> +	skb_reserve(skb, IPFIELD_ALIGN_OFFSET);
> +	data = skb_put(skb, len);
> +
> +	/* Read the data from the WLAN module into our skb... */
> +	err = spu_read(card, IF_SPI_DATA_RDWRPORT_REG, data, ALIGN(len, 4));
> +	if (err)
> +		goto free_skb;
> +
> +	/* pass the SKB to libertas */
> +	err = lbs_process_rxed_packet(card->priv, skb);
> +	if (err)
> +		goto free_skb;
> +
> +	/* success */
> +	goto out;
> +
> +free_skb:
> +	dev_kfree_skb(skb);
> +out:
> +	if (err)
> +		lbs_pr_err("%s: err=%d\n", __func__, err);
> +	lbs_deb_leave(LBS_DEB_SPI);
> +	return err;
> +}
> +
> +/* Move data or a command from the host to the card. */
> +static void if_spi_h2c(struct if_spi_card *card,
> +			struct if_spi_packet *packet, int type)
> +{
> +	int err = 0;
> +	u16 int_type, port_reg;
> +
> +	switch (type) {
> +	case MVMS_DAT:
> +		int_type = IF_SPI_CIC_TX_DOWNLOAD_OVER;
> +		port_reg = IF_SPI_DATA_RDWRPORT_REG;
> +		break;
> +	case MVMS_CMD:
> +		int_type = IF_SPI_CIC_CMD_DOWNLOAD_OVER;
> +		port_reg = IF_SPI_CMD_RDWRPORT_REG;
> +		break;
> +	default:
> +		lbs_pr_err("can't transfer buffer of type %d\n", type);
> +		err = -EINVAL;
> +		goto out;
> +	}
> +
> +	/* Write the data to the card */
> +	err = spu_write(card, port_reg, packet->buffer, packet->blen);
> +	if (err)
> +		goto out;
> +
> +out:
> +	kfree(packet);
> +
> +	if (err)
> +		lbs_pr_err("%s: error %d\n", __func__, err);
> +}
> +
> +/* Inform the host about a card event */
> +static void if_spi_e2h(struct if_spi_card *card)
> +{
> +	int err = 0;
> +	unsigned long flags;
> +	u32 cause;
> +	struct lbs_private *priv = card->priv;
> +
> +	err = spu_read_u32(card, IF_SPI_SCRATCH_3_REG, &cause);
> +	if (err)
> +		goto out;
> +
> +	spin_lock_irqsave(&priv->driver_lock, flags);
> +	lbs_queue_event(priv, cause & 0xff);
> +	spin_unlock_irqrestore(&priv->driver_lock, flags);
> +
> +out:
> +	if (err)
> +		lbs_pr_err("%s: error %d\n", __func__, err);
> +}
> +
> +static int lbs_spi_thread(void *data)
> +{
> +	int err;
> +	struct if_spi_card *card = data;
> +	u16 hiStatus;
> +	unsigned long flags;
> +	struct if_spi_packet *packet;
> +
> +	while (1) {
> +		/* Wait to be woken up by one of two things.  First, our ISR
> +		 * could tell us that something happened on the WLAN.
> +		 * Secondly, libertas could call hw_host_to_card with more
> +		 * data, which we might be able to send.
> +		 */
> +		do {
> +			err = down_interruptible(&card->spi_ready);
> +			if (!card->run_thread) {
> +				up(&card->spi_thread_terminated);
> +				do_exit(0);
> +			}
> +		} while (err == EINTR);
> +
> +		/* Read the host interrupt status register to see what we
> +		 * can do. */
> +		err = spu_read_u16(card, IF_SPI_HOST_INT_STATUS_REG,
> +					&hiStatus);
> +		if (err) {
> +			lbs_pr_err("I/O error\n");
> +			goto err;
> +		}
> +
> +		if (hiStatus & IF_SPI_HIST_CMD_UPLOAD_RDY)
> +			err = if_spi_c2h_cmd(card);
> +			if (err)
> +				goto err;
> +		if (hiStatus & IF_SPI_HIST_RX_UPLOAD_RDY)
> +			err = if_spi_c2h_data(card);
> +			if (err)
> +				goto err;
> +		if (hiStatus & IF_SPI_HIST_CMD_DOWNLOAD_RDY) {
> +			/* This means two things. First of all,
> +			 * if there was a previous command sent, the card has
> +			 * successfully received it.
> +			 * Secondly, it is now ready to download another
> +			 * command.
> +			 */
> +			lbs_host_to_card_done(card->priv);
> +
> +			/* Do we have any command packets from the host to
> +			 * send? */
> +			packet = NULL;
> +			spin_lock_irqsave(&card->buffer_lock, flags);
> +			if (!list_empty(&card->cmd_packet_list)) {
> +				packet = (struct if_spi_packet *)(card->
> +						cmd_packet_list.next);
> +				list_del(&packet->list);
> +			}
> +			spin_unlock_irqrestore(&card->buffer_lock, flags);
> +
> +			if (packet)
> +				if_spi_h2c(card, packet, MVMS_CMD);
> +		}
> +		if (hiStatus & IF_SPI_HIST_TX_DOWNLOAD_RDY) {
> +			/* Do we have any data packets from the host to
> +			 * send? */
> +			packet = NULL;
> +			spin_lock_irqsave(&card->buffer_lock, flags);
> +			if (!list_empty(&card->data_packet_list)) {
> +				packet = (struct if_spi_packet *)(card->
> +						data_packet_list.next);
> +				list_del(&packet->list);
> +			}
> +			spin_unlock_irqrestore(&card->buffer_lock, flags);
> +
> +			if (packet)
> +				if_spi_h2c(card, packet, MVMS_DAT);
> +		}
> +		if (hiStatus & IF_SPI_HIST_CARD_EVENT)
> +			if_spi_e2h(card);
> +
> +err:
> +		if (err)
> +			lbs_pr_err("%s: got error %d\n", __func__, err);
> +	}
> +}
> +
> +/* Block until lbs_spi_thread thread has terminated */
> +static void if_spi_terminate_spi_thread(struct if_spi_card *card)
> +{
> +	/* It would be nice to use kthread_stop here, but that function
> +	 * can't wake threads waiting for a semaphore. */
> +	card->run_thread = 0;
> +	up(&card->spi_ready);
> +	down(&card->spi_thread_terminated);
> +}
> +
> +/*
> + * Host to Card
> + *
> + * Called from Libertas to transfer some data to the WLAN device
> + * We can't sleep here. */
> +static int if_spi_host_to_card(struct lbs_private *priv,
> +				u8 type, u8 *buf, u16 nb)
> +{
> +	int err = 0;
> +	unsigned long flags;
> +	struct if_spi_card *card = priv->card;
> +	struct if_spi_packet *packet;
> +	u16 blen;
> +
> +	lbs_deb_enter_args(LBS_DEB_SPI, "type %d, bytes %d", type, nb);
> +
> +	if (nb == 0) {
> +		lbs_pr_err("%s: invalid size requested: %d\n", __func__, nb);
> +		err = -EINVAL;
> +		goto out;
> +	}
> +	blen = ALIGN(nb, 4);
> +	packet = kzalloc(sizeof(struct if_spi_packet) + blen, GFP_ATOMIC);
> +	if (!packet) {
> +		err = -ENOMEM;
> +		goto out;
> +	}
> +	packet->blen = blen;
> +	memcpy(packet->buffer, buf, nb);
> +	memset(packet->buffer + nb, 0, blen - nb);
> +
> +	switch (type) {
> +	case MVMS_CMD:
> +		priv->dnld_sent = DNLD_CMD_SENT;
> +		spin_lock_irqsave(&card->buffer_lock, flags);
> +		list_add_tail(&packet->list, &card->cmd_packet_list);
> +		spin_unlock_irqrestore(&card->buffer_lock, flags);
> +		break;
> +	case MVMS_DAT:
> +		priv->dnld_sent = DNLD_DATA_SENT;
> +		spin_lock_irqsave(&card->buffer_lock, flags);
> +		list_add_tail(&packet->list, &card->data_packet_list);
> +		spin_unlock_irqrestore(&card->buffer_lock, flags);
> +		break;
> +	default:
> +		lbs_pr_err("can't transfer buffer of type %d", type);
> +		err = -EINVAL;
> +		break;
> +	}
> +
> +	/* Wake up the spi thread */
> +	up(&card->spi_ready);
> +out:
> +	lbs_deb_leave_args(LBS_DEB_SPI, "err=%d", err);
> +	return err;
> +}
> +
> +/*
> + * Host Interrupts
> + *
> + * Service incoming interrupts from the WLAN device. We can't sleep here, so
> + * don't try to talk on the SPI bus, just wake up the SPI thread.
> + */
> +static irqreturn_t if_spi_host_interrupt(int irq, void *dev_id)
> +{
> +	struct if_spi_card *card = dev_id;
> +
> +	up(&card->spi_ready);
> +	return IRQ_HANDLED;
> +}
> +
> +/*
> + * SPI callbacks
> + */
> +
> +static int if_spi_calculate_fw_names(u16 card_id,
> +			      char *helper_fw, char *main_fw)
> +{
> +	int i;
> +	for (i = 0; i < ARRAY_SIZE(chip_id_to_device_name); ++i) {
> +		if (card_id == chip_id_to_device_name[i].chip_id)
> +			break;
> +	}
> +	if (i == ARRAY_SIZE(chip_id_to_device_name)) {
> +		lbs_pr_err("Unsupported chip_id: 0x%02x\n", card_id);
> +		return -EAFNOSUPPORT;
> +	}
> +	snprintf(helper_fw, FIRMWARE_NAME_MAX, "libertas/gspi%d_hlp.bin",
> +		 chip_id_to_device_name[i].name);
> +	snprintf(main_fw, FIRMWARE_NAME_MAX, "libertas/gspi%d.bin",
> +		 chip_id_to_device_name[i].name);
> +	return 0;
> +}
> +
> +static int __devinit if_spi_probe(struct spi_device *spi)
> +{
> +	struct if_spi_card *card;
> +	struct lbs_private *priv = NULL;
> +	struct libertas_spi_platform_data *pdata = spi->dev.platform_data;
> +	int err = 0;
> +	u32 scratch;
> +
> +	lbs_deb_enter(LBS_DEB_SPI);
> +
> +	/* Allocate card structure to represent this specific device */
> +	card = kzalloc(sizeof(struct if_spi_card), GFP_KERNEL);
> +	if (!card) {
> +		err = -ENOMEM;
> +		goto out;
> +	}
> +	spi_set_drvdata(spi, card);
> +	card->spi = spi;
> +	card->gpio_cs = pdata->gpio_cs;
> +	card->prev_xfer_time = jiffies;
> +
> +	sema_init(&card->spi_ready, 0);
> +	sema_init(&card->spi_thread_terminated, 0);
> +	INIT_LIST_HEAD(&card->cmd_packet_list);
> +	INIT_LIST_HEAD(&card->data_packet_list);
> +	spin_lock_init(&card->buffer_lock);
> +
> +	/* set up GPIO CS line. TODO: use  regular CS line */
> +	err = gpio_request(card->gpio_cs, "if_spi_gpio_chip_select");
> +	if (err)
> +		goto free_card;
> +	err = gpio_direction_output(card->gpio_cs, 1);
> +	if (err)
> +		goto free_gpio;
> +
> +	/* Initialize the SPI Interface Unit */
> +	err = spu_init(card, pdata->use_dummy_writes);
> +	if (err)
> +		goto free_gpio;
> +	err = spu_get_chip_revision(card, &card->card_id, &card->card_rev);
> +	if (err)
> +		goto free_gpio;
> +
> +	/* Firmware load */
> +	err = spu_read_u32(card, IF_SPI_SCRATCH_4_REG, &scratch);
> +	if (err)
> +		goto free_gpio;
> +	if (scratch == SUCCESSFUL_FW_DOWNLOAD_MAGIC)
> +		lbs_deb_spi("Firmware is already loaded for "
> +			    "Marvell WLAN 802.11 adapter\n");
> +	else {
> +		err = if_spi_calculate_fw_names(card->card_id,
> +				card->helper_fw_name, card->main_fw_name);
> +		if (err)
> +			goto free_gpio;
> +
> +		lbs_deb_spi("Initializing FW for Marvell WLAN 802.11 adapter "
> +				"(chip_id = 0x%04x, chip_rev = 0x%02x) "
> +				"attached to SPI bus_num %d, chip_select %d. "
> +				"spi->max_speed_hz=%d\n",
> +				card->card_id, card->card_rev,
> +				spi->master->bus_num, spi->chip_select,
> +				spi->max_speed_hz);
> +		err = if_spi_prog_helper_firmware(card);
> +		if (err)
> +			goto free_gpio;
> +		err = if_spi_prog_main_firmware(card);
> +		if (err)
> +			goto free_gpio;
> +		lbs_deb_spi("loaded FW for Marvell WLAN 802.11 adapter\n");
> +	}
> +
> +	err = spu_set_interrupt_mode(card, 0, 1);
> +	if (err)
> +		goto free_gpio;
> +
> +	/* Register our card with libertas.
> +	 * This will call alloc_etherdev */
> +	priv = lbs_add_card(card, &spi->dev);
> +	if (!priv) {
> +		err = -ENOMEM;
> +		goto free_gpio;
> +	}
> +	card->priv = priv;
> +	priv->card = card;
> +	priv->hw_host_to_card = if_spi_host_to_card;
> +	priv->fw_ready = 1;
> +	priv->ps_supported = 1;
> +
> +	/* Initialize interrupt handling stuff. */
> +	card->run_thread = 1;
> +	card->spi_thread = kthread_run(lbs_spi_thread, card, "lbs_spi_thread");
> +	if (IS_ERR(card->spi_thread)) {
> +		card->run_thread = 0;
> +		err = PTR_ERR(card->spi_thread);
> +		lbs_pr_err("error creating SPI thread: err=%d\n", err);
> +		goto remove_card;
> +	}
> +	err = request_irq(spi->irq, if_spi_host_interrupt,
> +			IRQF_TRIGGER_FALLING, "libertas_spi", card);
> +	if (err) {
> +		lbs_pr_err("can't get host irq line-- request_irq failed\n");
> +		goto terminate_thread;
> +	}
> +
> +	/* Start the card.
> +	 * This will call register_netdev, and we'll start
> +	 * getting interrupts... */
> +	err = lbs_start_card(priv);
> +	if (err)
> +		goto release_irq;
> +
> +	lbs_deb_spi("Finished initializing WLAN module.\n");
> +
> +	/* successful exit */
> +	goto out;
> +
> +release_irq:
> +	free_irq(spi->irq, card);
> +terminate_thread:
> +	if_spi_terminate_spi_thread(card);
> +remove_card:
> +	lbs_remove_card(priv); /* will call free_netdev */
> +free_gpio:
> +	gpio_free(card->gpio_cs);
> +free_card:
> +	free_if_spi_card(card);
> +out:
> +	lbs_deb_leave_args(LBS_DEB_SPI, "err %d\n", err);
> +	return err;
> +}
> +
> +static int __devexit libertas_spi_remove(struct spi_device *spi)
> +{
> +	struct if_spi_card *card = spi_get_drvdata(spi);
> +	struct lbs_private *priv = card->priv;
> +
> +	lbs_deb_spi("libertas_spi_remove\n");
> +	lbs_deb_enter(LBS_DEB_SPI);
> +	priv->surpriseremoved = 1;
> +
> +	lbs_stop_card(priv);
> +	free_irq(spi->irq, card);
> +	if_spi_terminate_spi_thread(card);
> +	lbs_remove_card(priv); /* will call free_netdev */
> +	gpio_free(card->gpio_cs);
> +	free_if_spi_card(card);
> +	lbs_deb_leave(LBS_DEB_SPI);
> +	return 0;
> +}
> +
> +static struct spi_driver libertas_spi_driver = {
> +	.probe	= if_spi_probe,
> +	.remove = __devexit_p(libertas_spi_remove),
> +	.driver = {
> +		.name	= "libertas_spi",
> +		.bus	= &spi_bus_type,
> +		.owner	= THIS_MODULE,
> +	},
> +};
> +
> +/*
> + * Module functions
> + */
> +
> +static int __init if_spi_init_module(void)
> +{
> +	int ret = 0;
> +	lbs_deb_enter(LBS_DEB_SPI);
> +	printk(KERN_INFO "libertas_spi: Libertas SPI driver\n");
> +	ret = spi_register_driver(&libertas_spi_driver);
> +	lbs_deb_leave(LBS_DEB_SPI);
> +	return ret;
> +}
> +
> +static void __exit if_spi_exit_module(void)
> +{
> +	lbs_deb_enter(LBS_DEB_SPI);
> +	spi_unregister_driver(&libertas_spi_driver);
> +	lbs_deb_leave(LBS_DEB_SPI);
> +}
> +
> +module_init(if_spi_init_module);
> +module_exit(if_spi_exit_module);
> +
> +MODULE_DESCRIPTION("Libertas SPI WLAN Driver");
> +MODULE_AUTHOR("Andrey Yurovsky <andrey@xxxxxxxxxxx>, "
> +	      "Colin McCabe <colin@xxxxxxxxxxx>");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/net/wireless/libertas/if_spi.h b/drivers/net/wireless/libertas/if_spi.h
> new file mode 100644
> index 0000000..2103869
> --- /dev/null
> +++ b/drivers/net/wireless/libertas/if_spi.h
> @@ -0,0 +1,208 @@
> +/*
> + *	linux/drivers/net/wireless/libertas/if_spi.c
> + *
> + *	Driver for Marvell SPI WLAN cards.
> + *
> + *	Copyright 2008 Analog Devices Inc.
> + *
> + *	Authors:
> + *	Andrey Yurovsky <andrey@xxxxxxxxxxx>
> + *	Colin McCabe <colin@xxxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or (at
> + * your option) any later version.
> + */
> +
> +#ifndef _LBS_IF_SPI_H_
> +#define _LBS_IF_SPI_H_
> +
> +#define IPFIELD_ALIGN_OFFSET 2
> +#define IF_SPI_CMD_BUF_SIZE 2400
> +
> +/***************** Firmware *****************/
> +struct chip_ident {
> +	u16 chip_id;
> +	u16 name;
> +};
> +
> +#define MAX_MAIN_FW_LOAD_CRC_ERR 10
> +
> +/* Chunk size when loading the helper firmware */
> +#define HELPER_FW_LOAD_CHUNK_SZ 64
> +
> +/* Value to write to indicate end of helper firmware dnld */
> +#define FIRMWARE_DNLD_OK 0x0000
> +
> +/* Value to check once the main firmware is downloaded */
> +#define SUCCESSFUL_FW_DOWNLOAD_MAGIC 0x88888888
> +
> +/***************** SPI Interface Unit *****************/
> +/* Masks used in SPI register read/write operations */
> +#define IF_SPI_READ_OPERATION_MASK 0x0
> +#define IF_SPI_WRITE_OPERATION_MASK 0x8000
> +
> +/* SPI register offsets. 4-byte aligned. */
> +#define IF_SPI_DEVICEID_CTRL_REG 0x00	/* DeviceID controller reg */
> +#define IF_SPI_IO_READBASE_REG 0x04 	/* Read I/O base reg */
> +#define IF_SPI_IO_WRITEBASE_REG 0x08	/* Write I/O base reg */
> +#define IF_SPI_IO_RDWRPORT_REG 0x0C	/* Read/Write I/O port reg */
> +
> +#define IF_SPI_CMD_READBASE_REG 0x10	/* Read command base reg */
> +#define IF_SPI_CMD_WRITEBASE_REG 0x14	/* Write command base reg */
> +#define IF_SPI_CMD_RDWRPORT_REG 0x18	/* Read/Write command port reg */
> +
> +#define IF_SPI_DATA_READBASE_REG 0x1C	/* Read data base reg */
> +#define IF_SPI_DATA_WRITEBASE_REG 0x20	/* Write data base reg */
> +#define IF_SPI_DATA_RDWRPORT_REG 0x24	/* Read/Write data port reg */
> +
> +#define IF_SPI_SCRATCH_1_REG 0x28	/* Scratch reg 1 */
> +#define IF_SPI_SCRATCH_2_REG 0x2C	/* Scratch reg 2 */
> +#define IF_SPI_SCRATCH_3_REG 0x30	/* Scratch reg 3 */
> +#define IF_SPI_SCRATCH_4_REG 0x34	/* Scratch reg 4 */
> +
> +#define IF_SPI_TX_FRAME_SEQ_NUM_REG 0x38 /* Tx frame sequence number reg */
> +#define IF_SPI_TX_FRAME_STATUS_REG 0x3C	/* Tx frame status reg */
> +
> +#define IF_SPI_HOST_INT_CTRL_REG 0x40	/* Host interrupt controller reg */
> +
> +#define IF_SPI_CARD_INT_CAUSE_REG 0x44	/* Card interrupt cause reg */
> +#define IF_SPI_CARD_INT_STATUS_REG 0x48 /* Card interupt status reg */
> +#define IF_SPI_CARD_INT_EVENT_MASK_REG 0x4C /* Card interrupt event mask */
> +#define IF_SPI_CARD_INT_STATUS_MASK_REG	0x50 /* Card interrupt status mask */
> +
> +#define IF_SPI_CARD_INT_RESET_SELECT_REG 0x54 /* Card interrupt reset select */
> +
> +#define IF_SPI_HOST_INT_CAUSE_REG 0x58	/* Host interrupt cause reg */
> +#define IF_SPI_HOST_INT_STATUS_REG 0x5C	/* Host interrupt status reg */
> +#define IF_SPI_HOST_INT_EVENT_MASK_REG 0x60 /* Host interrupt event mask */
> +#define IF_SPI_HOST_INT_STATUS_MASK_REG	0x64 /* Host interrupt status mask */
> +#define IF_SPI_HOST_INT_RESET_SELECT_REG 0x68 /* Host interrupt reset select */
> +
> +#define IF_SPI_DELAY_READ_REG 0x6C	/* Delay read reg */
> +#define IF_SPI_SPU_BUS_MODE_REG 0x70	/* SPU BUS mode reg */
> +
> +/***************** IF_SPI_DEVICEID_CTRL_REG *****************/
> +#define IF_SPI_DEVICEID_CTRL_REG_TO_CARD_ID(dc) ((dc & 0xffff0000)>>16)
> +#define IF_SPI_DEVICEID_CTRL_REG_TO_CARD_REV(dc) (dc & 0x000000ff)
> +
> +/***************** IF_SPI_HOST_INT_CTRL_REG *****************/
> +/** Host Interrupt Control bit : Wake up */
> +#define IF_SPI_HICT_WAKE_UP				(1<<0)
> +/** Host Interrupt Control bit : WLAN ready */
> +#define IF_SPI_HICT_WLAN_READY				(1<<1)
> +/*#define IF_SPI_HICT_FIFO_FIRST_HALF_EMPTY		(1<<2) */
> +/*#define IF_SPI_HICT_FIFO_SECOND_HALF_EMPTY		(1<<3) */
> +/*#define IF_SPI_HICT_IRQSRC_WLAN			(1<<4) */
> +/** Host Interrupt Control bit : Tx auto download */
> +#define IF_SPI_HICT_TX_DOWNLOAD_OVER_AUTO		(1<<5)
> +/** Host Interrupt Control bit : Rx auto upload */
> +#define IF_SPI_HICT_RX_UPLOAD_OVER_AUTO			(1<<6)
> +/** Host Interrupt Control bit : Command auto download */
> +#define IF_SPI_HICT_CMD_DOWNLOAD_OVER_AUTO		(1<<7)
> +/** Host Interrupt Control bit : Command auto upload */
> +#define IF_SPI_HICT_CMD_UPLOAD_OVER_AUTO		(1<<8)
> +
> +/***************** IF_SPI_CARD_INT_CAUSE_REG *****************/
> +/** Card Interrupt Case bit : Tx download over */
> +#define IF_SPI_CIC_TX_DOWNLOAD_OVER			(1<<0)
> +/** Card Interrupt Case bit : Rx upload over */
> +#define IF_SPI_CIC_RX_UPLOAD_OVER			(1<<1)
> +/** Card Interrupt Case bit : Command download over */
> +#define IF_SPI_CIC_CMD_DOWNLOAD_OVER			(1<<2)
> +/** Card Interrupt Case bit : Host event */
> +#define IF_SPI_CIC_HOST_EVENT				(1<<3)
> +/** Card Interrupt Case bit : Command upload over */
> +#define IF_SPI_CIC_CMD_UPLOAD_OVER			(1<<4)
> +/** Card Interrupt Case bit : Power down */
> +#define IF_SPI_CIC_POWER_DOWN				(1<<5)
> +
> +/***************** IF_SPI_CARD_INT_STATUS_REG *****************/
> +#define IF_SPI_CIS_TX_DOWNLOAD_OVER			(1<<0)
> +#define IF_SPI_CIS_RX_UPLOAD_OVER			(1<<1)
> +#define IF_SPI_CIS_CMD_DOWNLOAD_OVER			(1<<2)
> +#define IF_SPI_CIS_HOST_EVENT				(1<<3)
> +#define IF_SPI_CIS_CMD_UPLOAD_OVER			(1<<4)
> +#define IF_SPI_CIS_POWER_DOWN				(1<<5)
> +
> +/***************** IF_SPI_HOST_INT_CAUSE_REG *****************/
> +#define IF_SPI_HICU_TX_DOWNLOAD_RDY			(1<<0)
> +#define IF_SPI_HICU_RX_UPLOAD_RDY			(1<<1)
> +#define IF_SPI_HICU_CMD_DOWNLOAD_RDY			(1<<2)
> +#define IF_SPI_HICU_CARD_EVENT				(1<<3)
> +#define IF_SPI_HICU_CMD_UPLOAD_RDY			(1<<4)
> +#define IF_SPI_HICU_IO_WR_FIFO_OVERFLOW			(1<<5)
> +#define IF_SPI_HICU_IO_RD_FIFO_UNDERFLOW		(1<<6)
> +#define IF_SPI_HICU_DATA_WR_FIFO_OVERFLOW		(1<<7)
> +#define IF_SPI_HICU_DATA_RD_FIFO_UNDERFLOW		(1<<8)
> +#define IF_SPI_HICU_CMD_WR_FIFO_OVERFLOW		(1<<9)
> +#define IF_SPI_HICU_CMD_RD_FIFO_UNDERFLOW		(1<<10)
> +
> +/***************** IF_SPI_HOST_INT_STATUS_REG *****************/
> +/** Host Interrupt Status bit : Tx download ready */
> +#define IF_SPI_HIST_TX_DOWNLOAD_RDY			(1<<0)
> +/** Host Interrupt Status bit : Rx upload ready */
> +#define IF_SPI_HIST_RX_UPLOAD_RDY			(1<<1)
> +/** Host Interrupt Status bit : Command download ready */
> +#define IF_SPI_HIST_CMD_DOWNLOAD_RDY			(1<<2)
> +/** Host Interrupt Status bit : Card event */
> +#define IF_SPI_HIST_CARD_EVENT				(1<<3)
> +/** Host Interrupt Status bit : Command upload ready */
> +#define IF_SPI_HIST_CMD_UPLOAD_RDY			(1<<4)
> +/** Host Interrupt Status bit : I/O write FIFO overflow */
> +#define IF_SPI_HIST_IO_WR_FIFO_OVERFLOW			(1<<5)
> +/** Host Interrupt Status bit : I/O read FIFO underflow */
> +#define IF_SPI_HIST_IO_RD_FIFO_UNDRFLOW			(1<<6)
> +/** Host Interrupt Status bit : Data write FIFO overflow */
> +#define IF_SPI_HIST_DATA_WR_FIFO_OVERFLOW		(1<<7)
> +/** Host Interrupt Status bit : Data read FIFO underflow */
> +#define IF_SPI_HIST_DATA_RD_FIFO_UNDERFLOW		(1<<8)
> +/** Host Interrupt Status bit : Command write FIFO overflow */
> +#define IF_SPI_HIST_CMD_WR_FIFO_OVERFLOW		(1<<9)
> +/** Host Interrupt Status bit : Command read FIFO underflow */
> +#define IF_SPI_HIST_CMD_RD_FIFO_UNDERFLOW		(1<<10)
> +
> +/***************** IF_SPI_HOST_INT_STATUS_MASK_REG *****************/
> +/** Host Interrupt Status Mask bit : Tx download ready */
> +#define IF_SPI_HISM_TX_DOWNLOAD_RDY			(1<<0)
> +/** Host Interrupt Status Mask bit : Rx upload ready */
> +#define IF_SPI_HISM_RX_UPLOAD_RDY			(1<<1)
> +/** Host Interrupt Status Mask bit : Command download ready */
> +#define IF_SPI_HISM_CMD_DOWNLOAD_RDY			(1<<2)
> +/** Host Interrupt Status Mask bit : Card event */
> +#define IF_SPI_HISM_CARDEVENT				(1<<3)
> +/** Host Interrupt Status Mask bit : Command upload ready */
> +#define IF_SPI_HISM_CMD_UPLOAD_RDY			(1<<4)
> +/** Host Interrupt Status Mask bit : I/O write FIFO overflow */
> +#define IF_SPI_HISM_IO_WR_FIFO_OVERFLOW			(1<<5)
> +/** Host Interrupt Status Mask bit : I/O read FIFO underflow */
> +#define IF_SPI_HISM_IO_RD_FIFO_UNDERFLOW		(1<<6)
> +/** Host Interrupt Status Mask bit : Data write FIFO overflow */
> +#define IF_SPI_HISM_DATA_WR_FIFO_OVERFLOW		(1<<7)
> +/** Host Interrupt Status Mask bit : Data write FIFO underflow */
> +#define IF_SPI_HISM_DATA_RD_FIFO_UNDERFLOW		(1<<8)
> +/** Host Interrupt Status Mask bit : Command write FIFO overflow */
> +#define IF_SPI_HISM_CMD_WR_FIFO_OVERFLOW		(1<<9)
> +/** Host Interrupt Status Mask bit : Command write FIFO underflow */
> +#define IF_SPI_HISM_CMD_RD_FIFO_UNDERFLOW		(1<<10)
> +
> +/***************** IF_SPI_SPU_BUS_MODE_REG *****************/
> +/* SCK edge on which the WLAN module outputs data on MISO */
> +#define IF_SPI_BUS_MODE_SPI_CLOCK_PHASE_FALLING 0x8
> +#define IF_SPI_BUS_MODE_SPI_CLOCK_PHASE_RISING 0x0
> +
> +/* In a SPU read operation, there is a delay between writing the SPU
> + * register name and getting back data from the WLAN module.
> + * This can be specified in terms of nanoseconds or in terms of dummy
> + * clock cycles which the master must output before receiving a response. */
> +#define IF_SPI_BUS_MODE_DELAY_METHOD_DUMMY_CLOCK 0x4
> +#define IF_SPI_BUS_MODE_DELAY_METHOD_TIMED 0x0
> +
> +/* Some different modes of SPI operation */
> +#define IF_SPI_BUS_MODE_8_BIT_ADDRESS_16_BIT_DATA 0x00
> +#define IF_SPI_BUS_MODE_8_BIT_ADDRESS_32_BIT_DATA 0x01
> +#define IF_SPI_BUS_MODE_16_BIT_ADDRESS_16_BIT_DATA 0x02
> +#define IF_SPI_BUS_MODE_16_BIT_ADDRESS_32_BIT_DATA 0x03
> +
> +#endif
> diff --git a/include/linux/spi/libertas_spi.h b/include/linux/spi/libertas_spi.h
> new file mode 100644
> index 0000000..ada71b4
> --- /dev/null
> +++ b/include/linux/spi/libertas_spi.h
> @@ -0,0 +1,25 @@
> +/*
> + * board-specific data for the libertas_spi driver.
> + *
> + * Copyright 2008 Analog Devices Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or (at
> + * your option) any later version.
> + */
> +#ifndef _LIBERTAS_SPI_H_
> +#define _LIBERTAS_SPI_H_
> +struct libertas_spi_platform_data {
> +	/* There are two ways to read data from the WLAN module's SPI
> +	 * interface. Setting 0 or 1 here controls which one is used.
> +	 *
> +	 * Usually you want to set use_dummy_writes = 1.
> +	 * However, if that doesn't work or if you are using a slow SPI clock
> +	 * speed, you may want to use 0 here. */
> +	u16 use_dummy_writes;
> +
> +	/* GPIO number to use as chip select */
> +	u16 gpio_cs;
> +};
> +#endif

--
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Linux Host AP]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Linux Kernel]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Samba]     [Device Mapper]
  Powered by Linux