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

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *	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
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/hardirq.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/firmware.h>
#include <linux/jiffies.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/slab.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[] __aligned(4);
};

struct if_spi_card {
	struct spi_device		*spi;
	struct lbs_private		*priv;
	struct libertas_spi_platform_data *pdata;

	/* 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 workqueue_struct		*workqueue;
	struct work_struct		packet_work;
	struct work_struct		resume_work;

	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;

	/* True is card suspended */
	u8				suspended;
};

static void free_if_spi_card(struct if_spi_card *card)
{
	struct if_spi_packet *packet, *tmp;

	list_for_each_entry_safe(packet, tmp, &card->cmd_packet_list, list) {
		list_del(&packet->list);
		kfree(packet);
	}
	list_for_each_entry_safe(packet, tmp, &card->data_packet_list, list) {
		list_del(&packet->list);
		kfree(packet);
	}
	kfree(card);
}

#define MODEL_8385	0x04
#define MODEL_8686	0x0b
#define MODEL_8688	0x10

static const struct lbs_fw_table fw_table[] = {
	{ MODEL_8385, "libertas/gspi8385_helper.bin", "libertas/gspi8385.bin" },
	{ MODEL_8385, "libertas/gspi8385_hlp.bin", "libertas/gspi8385.bin" },
	{ MODEL_8686, "libertas/gspi8686_v9_helper.bin", "libertas/gspi8686_v9.bin" },
	{ MODEL_8686, "libertas/gspi8686_hlp.bin", "libertas/gspi8686.bin" },
	{ MODEL_8688, "libertas/gspi8688_helper.bin", "libertas/gspi8688.bin" },
	{ 0, NULL, NULL }
};
MODULE_FIRMWARE("libertas/gspi8385_helper.bin");
MODULE_FIRMWARE("libertas/gspi8385_hlp.bin");
MODULE_FIRMWARE("libertas/gspi8385.bin");
MODULE_FIRMWARE("libertas/gspi8686_v9_helper.bin");
MODULE_FIRMWARE("libertas/gspi8686_v9.bin");
MODULE_FIRMWARE("libertas/gspi8686_hlp.bin");
MODULE_FIRMWARE("libertas/gspi8686.bin");
MODULE_FIRMWARE("libertas/gspi8688_helper.bin");
MODULE_FIRMWARE("libertas/gspi8688.bin");


/*
 * 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
 * eith