path: root/drivers/net/wireless/ath/ath6kl/sdio.c

/*
 * Copyright (c) 2004-2011 Atheros Communications Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/module.h>
#include <linux/mmc/card.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/host.h>
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/sdio_ids.h>
#include <linux/mmc/sdio.h>
#include <linux/mmc/sd.h>
#include "htc_hif.h"
#include "hif-ops.h"
#include "target.h"
#include "debug.h"
#include "cfg80211.h"

struct ath6kl_sdio {
	struct sdio_func *func;

	spinlock_t lock;

	/* free list */
	struct list_head bus_req_freeq;

	/* available bus requests */
	struct bus_request bus_req[BUS_REQUEST_MAX_NUM];

	struct ath6kl *ar;
	u8 *dma_buffer;

	/* scatter request list head */
	struct list_head scat_req;

	spinlock_t scat_lock;
	bool is_disabled;
	atomic_t irq_handling;
	const struct sdio_device_id *id;
	struct work_struct wr_async_work;
	struct list_head wr_asyncq;
	spinlock_t wr_async_lock;
};

#define CMD53_ARG_READ          0
#define CMD53_ARG_WRITE         1
#define CMD53_ARG_BLOCK_BASIS   1
#define CMD53_ARG_FIXED_ADDRESS 0
#define CMD53_ARG_INCR_ADDRESS  1

static inline struct ath6kl_sdio *ath6kl_sdio_priv(struct ath6kl *ar)
{
	return ar->hif_priv;
}

/*
 * Macro to check if DMA buffer is WORD-aligned and DMA-able.
 * Most host controllers assume the buffer is DMA'able and will
 * bug-check otherwise (i.e. buffers on the stack). virt_addr_valid
 * check fails on stack memory.
 */
static inline bool buf_needs_bounce(u8 *buf)
{
	return ((unsigned long) buf & 0x3) || !virt_addr_valid(buf);
}

static void ath6kl_sdio_set_mbox_info(struct ath6kl *ar)
{
	struct ath6kl_mbox_info *mbox_info = &ar->mbox_info;

	/* EP1 has an extended range */
	mbox_info->htc_addr = HIF_MBOX_BASE_ADDR;
	mbox_info->htc_ext_addr = HIF_MBOX0_EXT_BASE_ADDR;
	mbox_info->htc_ext_sz = HIF_MBOX0_EXT_WIDTH;
	mbox_info->block_size = HIF_MBOX_BLOCK_SIZE;
	mbox_info->gmbox_addr = HIF_GMBOX_BASE_ADDR;
	mbox_info->gmbox_sz = HIF_GMBOX_WIDTH;
}

static inline void ath6kl_sdio_set_cmd53_arg(u32 *arg, u8 rw, u8 func,
					     u8 mode, u8 opcode, u32 addr,
					     u16 blksz)
{
	*arg = (((rw & 1) << 31) |
		((func & 0x7) << 28) |
		((mode & 1) << 27) |
		((opcode & 1) << 26) |
		((addr & 0x1FFFF) << 9) |
		(blksz & 0x1FF));
}

static inline void ath6kl_sdio_set_cmd52_arg(u32 *arg, u8 write, u8 raw,
					     unsigned int address,
					     unsigned char val)
{
	const u8 func = 0;

	*arg = ((write & 1) << 31) |
	       ((func & 0x7) << 28) |
	       ((raw & 1) << 27) |
	       (1 << 26) |
	       ((address & 0x1FFFF) << 9) |
	       (1 << 8) |
	       (val & 0xFF);
}

static int ath6kl_sdio_func0_cmd52_wr_byte(struct mmc_card *card,
					   unsigned int address,
					   unsigned char byte)
{
	struct mmc_command io_cmd;

	memset(&io_cmd, 0, sizeof(io_cmd));
	ath6kl_sdio_set_cmd52_arg(&io_cmd.arg, 1, 0, address, byte);
	io_cmd.opcode = SD_IO_RW_DIRECT;
	io_cmd.flags = MMC_RSP_R5 | MMC_CMD_AC;

	return mmc_wait_for_cmd(card->host, &io_cmd, 0);
}

static int ath6kl_sdio_io(struct sdio_func *func, u32 request, u32 addr,
			  u8 *buf, u32 len)
{
	int ret = 0;

	if (request & HIF_WRITE) {
		/* FIXME: looks like ugly workaround for something */
		if (addr >= HIF_MBOX_BASE_ADDR &&
		    addr <= HIF_MBOX_END_ADDR)
			addr += (HIF_MBOX_WIDTH - len);

		/* FIXME: this also looks like ugly workaround */
		if (addr == HIF_MBOX0_EXT_BASE_ADDR)
			addr += HIF_MBOX0_EXT_WIDTH - len;

		if (request & HIF_FIXED_ADDRESS)
			ret = sdio_writesb(func, addr, buf, len);
		else
			ret = sdio_memcpy_toio(func, addr,