path: root/drivers/net/wireless/libertas/if_spi.c

/*
 *	linux/drivers/net/wireless/libertas/if_spi.c
 *
 *	Driver for Marvell SPI WLAN cards.
 *
 *	Copyright 2008 Analog Devices Inc.
 *
 *	Authors:
 *	Andrey Yurovsky <andrey@cozybit.com>
 *	Colin McCabe <colin@cozybit.com>
 *
 *	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/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;
	struct libertas_spi_platform_data *pdata;

	char				helper_fw_name[IF_SPI_FW_NAME_MAX];
	char				main_fw_name[IF_SPI_FW_NAME_MAX];

	/* The card ID and card revision, as reported by the hardware. */
	u16				card_id;
	u8				card_rev;

	/* 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.
 *
 */

static void spu_transaction_init(struct if_spi_card *card)
{
	if (!time_after(jiffies, card->prev_xfer_time + 1)) {
		/* Unfortunately, the SPU r