drivers/staging/brcm80211/brcmfmac/bcmsdh_sdmmc.c

/*
 * Copyright (c) 2010 Broadcom Corporation
 *
 * 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/types.h>
#include <linux/netdevice.h>
#include <bcmdefs.h>
#include <bcmdevs.h>
#include <bcmendian.h>
#include <bcmutils.h>
#include <osl.h>
#include <sdio.h>		/* SDIO Device and Protocol Specs */
#include <sdioh.h>		/* SDIO Host Controller Specification */
#include <bcmsdbus.h>		/* bcmsdh to/from specific controller APIs */
#include <sdiovar.h>		/* ioctl/iovars */

#include <linux/mmc/core.h>
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/sdio_ids.h>

#include <dngl_stats.h>
#include <dhd.h>

#if defined(CONFIG_PM_SLEEP)
#include <linux/suspend.h>
extern volatile bool dhd_mmc_suspend;
#endif
#include "bcmsdh_sdmmc.h"

extern int sdio_function_init(void);
extern void sdio_function_cleanup(void);

#if !defined(OOB_INTR_ONLY)
static void IRQHandler(struct sdio_func *func);
static void IRQHandlerF2(struct sdio_func *func);
#endif				/* !defined(OOB_INTR_ONLY) */
static int sdioh_sdmmc_get_cisaddr(sdioh_info_t *sd, u32 regaddr);
extern int sdio_reset_comm(struct mmc_card *card);

extern PBCMSDH_SDMMC_INSTANCE gInstance;

uint sd_sdmode = SDIOH_MODE_SD4;	/* Use SD4 mode by default */
uint sd_f2_blocksize = 512;	/* Default blocksize */

uint sd_divisor = 2;		/* Default 48MHz/2 = 24MHz */

uint sd_power = 1;		/* Default to SD Slot powered ON */
uint sd_clock = 1;		/* Default to SD Clock turned ON */
uint sd_hiok = false;		/* Don't use hi-speed mode by default */
uint sd_msglevel = 0x01;
uint sd_use_dma = true;
DHD_PM_RESUME_WAIT_INIT(sdioh_request_byte_wait);
DHD_PM_RESUME_WAIT_INIT(sdioh_request_word_wait);
DHD_PM_RESUME_WAIT_INIT(sdioh_request_packet_wait);
DHD_PM_RESUME_WAIT_INIT(sdioh_request_buffer_wait);

#define DMA_ALIGN_MASK	0x03

int sdioh_sdmmc_card_regread(sdioh_info_t *sd, int func, u32 regaddr,
			     int regsize, u32 *data);

static int sdioh_sdmmc_card_enablefuncs(sdioh_info_t *sd)
{
	int err_ret;
	u32 fbraddr;
	u8 func;

	sd_trace(("%s\n", __func__));

	/* Get the Card's common CIS address */
	sd->com_cis_ptr = sdioh_sdmmc_get_cisaddr(sd, SDIOD_CCCR_CISPTR_0);
	sd->func_cis_ptr[0] = sd->com_cis_ptr;
	sd_info(("%s: Card's Common CIS Ptr = 0x%x\n", __func__,
		 sd->com_cis_ptr));

	/* Get the Card's function CIS (for each function) */
	for (fbraddr = SDIOD_FBR_STARTADDR, func = 1;
	     func <= sd->num_funcs; func++, fbraddr += SDIOD_FBR_SIZE) {
		sd->func_cis_ptr[func] =
		    sdioh_sdmmc_get_cisaddr(sd, SDIOD_FBR_CISPTR_0 + fbraddr);
		sd_info(("%s: Function %d CIS Ptr = 0x%x\n", __func__, func,
			 sd->func_cis_ptr[func]));
	}

	sd->func_cis_ptr[0] = sd->com_cis_ptr;
	sd_info(("%s: Card's Common CIS Ptr = 0x%x\n", __func__,
		 sd->com_cis_ptr));

	/* Enable Function 1 */
	sdio_claim_host(gInstance->func[1]);
	err_ret = sdio_enable_func(gInstance->func[1]);
	sdio_release_host(gInstance->func[1]);
	if (err_ret) {
		sd_err(("bcmsdh_sdmmc: Failed to enable F1 Err: 0x%08x",
			err_ret));
	}

	return false;
}

/*
 *	Public entry points & extern's
 */
extern sdioh_info_t *sdioh_attach(osl_t *osh, void *bar0, uint irq)
{
	sdioh_info_t *sd;
	int err_ret;

	sd_trace(("%s\n", __func__));

	if (gInstance == NULL) {
		sd_err(("%s: SDIO Device not present\n", __func__));
		return NULL;
	}

	sd = kzalloc(sizeof(sdioh_info_t), GFP_ATOMIC);
	if (sd == NULL) {
		sd_err(("sdioh_attach: out of memory\n"));
		return NULL;
	}
	sd->osh = osh;
	if (sdioh_sdmmc_osinit(sd) != 0) {
		sd_err(("%s:sdioh_sdmmc_osinit() failed\n", __func__));
		kfree(sd);
		return NULL;
	}

	sd->num_funcs = 2;
	sd->sd_blockmode = true;
	sd->use_client_ints = true;
	sd->client_block_size[0] = 64;

	gInstance->sd = sd;

	/* Claim host controller */
	sdio_claim_host(gInstance->func[1]);

	sd->client_block_size[1] = 64;
	err_ret = sdio_set_block_size(gInstance->func[1], 64);
	if (err_ret)
		sd_err(("bcmsdh_sdmmc: Failed to set F1 blocksize\n"));

	/* Release host controller F1 */
	sdio_release_host(gInstance->func[1]);

	if (gInstance->func[2]) {
		/* Claim host controller F2 */
		sdio_claim_host(gInstance->func[2]);

		sd->client_block_size[2] = sd_f2_blocksize;
		err_ret =
		    sdio_set_block_size(gInstance->func[2], sd_f2_blocksize);
		if (err_ret)
			sd_err(("bcmsdh_sdmmc: Failed to set F2 blocksize "
				"to %d\n", sd_f2_blocksize));

		/* Release host controller F2 */
		sdio_release_host(gInstance->func[2]);
	}

	sdioh_sdmmc_card_enablefuncs(sd);

	sd_trace(("%s: Done\n", __func__));
	return sd;
}

extern SDIOH_API_RC sdioh_detach(osl_t *osh, sdioh_info_t *sd)
{
	sd_trace(("%s\n", __func__));

	if (sd) {

		/* Disable Function 2 */
		sdio_claim_host(gInstance->func[2]);
		sdio_disable_func(gInstance->func[2]);
		sdio_release_host(gInstance->func[2]);

		/* Disable Function 1 */
		sdio_claim_host(gInstance->func[1]);
		sdio_disable_func(gInstance->func[1]);
		sdio_release_host(gInstance->func[1]);

		/* deregister irq */
		sdioh_sdmmc_osfree(sd);

		kfree(sd);
	}
	return SDIOH_API_RC_SUCCESS;
}

#if defined(OOB_INTR_ONLY) && defined(HW_OOB)

extern SDIOH_API_RC sdioh_enable_func_intr(void)
{
	u8 reg;
	int err;

	if (gInstance->func[0]) {
		sdio_claim_host(gInstance->func[0]);

		reg = sdio_readb(gInstance->func[0], SDIOD_CCCR_INTEN, &err);
		if (err) {
			sd_err(("%s: error for read SDIO_CCCR_IENx : 0x%x\n",
				__func__, err));
			sdio_release_host(gInstance->func[0]);
			return SDIOH_API_RC_FAIL;
		}

		/* Enable F1 and F2 interrupts, set master enable */
		reg |=
		    (INTR_CTL_FUNC1_EN | INTR_CTL_FUNC2_EN |
		     INTR_CTL_MASTER_EN);

		sdio_writeb(gInstance->func[0], reg, SDIOD_CCCR_INTEN, &err);
		sdio_release_host(gInstance->func[0]);

		if (err) {
			sd_err(("%s: error for write SDIO_CCCR_IENx : 0x%x\n",
				__func__, err));
			return SDIOH_API_RC_FAIL;
		}
	}

	return SDIOH_API_RC_SUCCESS;
}

extern SDIOH_API_RC sdioh_disable_func_intr(void)
{
	u8 reg;
	int err;

	if (gInstance->func[0]) {
		sdio_claim_host(gInstance->func[0]);
		reg = sdio_readb(gInstance->func[0], SDIOD_CCCR_INTEN, &err);
		if (err) {
			sd_err(("%s: error for read SDIO_CCCR_IENx : 0x%x\n",
				__func__, err));
			sdio_release_host(gInstance->func[0]);
			return SDIOH_API_RC_FAIL;
		}

		reg &= ~(INTR_CTL_FUNC1_EN | INTR_CTL_FUNC2_EN);
		/* Disable master interrupt with the last function interrupt */
		if (!(reg & 0xFE))
			reg = 0;
		sdio_writeb(gInstance->func[0], reg, SDIOD_CCCR_INTEN, &err);

		sdio_release_host(gInstance->func[0]);
		if (err) {
			sd_err(("%s: error for write SDIO_CCCR_IENx : 0x%x\n",
				__func__, err));
			return SDIOH_API_RC_FAIL;
		}
	}
	return SDIOH_API_RC_SUCCESS;
}
#endif				/* defined(OOB_INTR_ONLY) && defined(HW_OOB) */

/* Configure callback to client when we recieve client interrupt */
extern SDIOH_API_RC
sdioh_interrupt_register(sdioh_info_t *sd, sdioh_cb_fn_t fn, void *argh)
{
	sd_trace(("%s: Entering\n", __func__));
	if (fn == NULL) {
		sd_err(("%s: interrupt handler is NULL, not registering\n",
			__func__));
		return SDIOH_API_RC_FAIL;
	}
#if !defined(OOB_INTR_ONLY)
	sd->intr_handler = fn;
	sd->intr_handler_arg = argh;
	sd->intr_handler_valid = true;

	/* register and unmask irq */
	if (gInstance->func[2]) {
		sdio_claim_host(gInstance->func[2]);
		sdio_claim_irq(gInstance->func[2], IRQHandlerF2);
		sdio_release_host(gInstance->func[2]);
	}

	if (gInstance->func[1]) {
		sdio_claim_host(gInstance->func[1]);
		sdio_claim_irq(gInstance->func[1], IRQHandler);
		sdio_release_host(gInstance->func[1]);
	}
#elif defined(HW_OOB)
	sdioh_enable_func_intr();
#endif				/* defined(OOB_INTR_ONLY) */
	return SDIOH_API_RC_SUCCESS;
}

extern SDIOH_API_RC sdioh_interrupt_deregister(sdioh_info_t *sd)
{
	sd_trace(("%s: Entering\n", __func__));

#if !defined(OOB_INTR_ONLY)
	if (gInstance->func[1]) {
		/* register and unmask irq */
		sdio_claim_host(gInstance->func[1]);
		sdio_release_irq(gInstance->func[1]);
		sdio_release_host(gInstance->func[1]);
	}

	if (gInstance->func[2]) {
		/* Claim host controller F2 */
		sdio_claim_host(gInstance->func[2]);
		sdio_release_irq(gInstance->func[2]);
		/* Release host controller F2 */
		sdio_release_host(gInstance->func[2]);
	}

	sd->intr_handler_valid = false;
	sd->intr_handler = NULL;
	sd->intr_handler_arg = NULL;
#elif defined(HW_OOB)
	sdioh_disable_func_intr();
#endif				/*  !defined(OOB_INTR_ONLY) */
	return SDIOH_API_RC_SUCCESS;
}

extern SDIOH_API_RC sdioh_interrupt_query(sdioh_info_t *sd, bool *onoff)
{
	sd_trace(("%s: Entering\n", __func__));
	*onoff = sd->client_intr_enabled;
	return SDIOH_API_RC_SUCCESS;
}

#if defined(DHD_DEBUG)
extern bool sdioh_interrupt_pending(sdioh_info_t *sd)
{
	return 0;
}
#endif

uint sdioh_query_iofnum(sdioh_info_t *sd)
{
	return sd->num_funcs;
}

/* IOVar table */
enum {
	IOV_MSGLEVEL = 1,
	IOV_BLOCKMODE,
	IOV_BLOCKSIZE,
	IOV_DMA,
	IOV_USEINTS,
	IOV_NUMINTS,
	IOV_NUMLOCALINTS,
	IOV_HOSTREG,
	IOV_DEVREG,
	IOV_DIVISOR,
	IOV_SDMODE,
	IOV_HISPEED,
	IOV_HCIREGS,
	IOV_POWER,
	IOV_CLOCK,
	IOV_RXCHAIN
};

const bcm_iovar_t sdioh_iovars[] = {
	{"sd_msglevel", IOV_MSGLEVEL, 0, IOVT_UINT32, 0},
	{"sd_blockmode", IOV_BLOCKMODE, 0, IOVT_BOOL, 0},
	{"sd_blocksize", IOV_BLOCKSIZE, 0, IOVT_UINT32, 0},/* ((fn << 16) |
								 size) */
	{"sd_dma", IOV_DMA, 0, IOVT_BOOL, 0},
	{"sd_ints", IOV_USEINTS, 0, IOVT_BOOL, 0},
	{"sd_numints", IOV_NUMINTS, 0, IOVT_UINT32, 0},
	{"sd_numlocalints", IOV_NUMLOCALINTS, 0, IOVT_UINT32, 0},
	{"sd_hostreg", IOV_HOSTREG, 0, IOVT_BUFFER, sizeof(sdreg_t)}
	,
	{"sd_devreg", IOV_DEVREG, 0, IOVT_BUFFER, sizeof(sdreg_t)}
	,
	{"sd_divisor", IOV_DIVISOR, 0, IOVT_UINT32, 0}
	,
	{"sd_power", IOV_POWER, 0, IOVT_UINT32, 0}
	,
	{"sd_clock", IOV_CLOCK, 0, IOVT_UINT32, 0}
	,
	{"sd_mode", IOV_SDMODE, 0, IOVT_UINT32, 100}
	,
	{"sd_highspeed", IOV_HISPEED, 0, IOVT_UINT32, 0}
	,
	{"sd_rxchain", IOV_RXCHAIN, 0, IOVT_BOOL, 0}
	,
	{NULL, 0, 0, 0, 0}
};

int
sdioh_iovar_op(sdioh_info_t *si, const char *name,
	       void *params, int plen, void *arg, int len, bool set)
{
	const bcm_iovar_t *vi = NULL;
	int bcmerror = 0;
	int val_size;
	s32 int_val = 0;
	bool bool_val;
	u32 actionid;

	ASSERT(name);
	ASSERT(len >= 0);

	/* Get must have return space; Set does not take qualifiers */
	ASSERT(set || (arg && len));
	ASSERT(!set || (!params && !plen));

	sd_trace(("%s: Enter (%s %s)\n", __func__, (set ? "set" : "get"),
		  name));

	vi = bcm_iovar_lookup(sdioh_iovars, name);
	if (vi == NULL) {
		bcmerror = BCME_UNSUPPORTED;
		goto exit;
	}

	bcmerror = bcm_iovar_lencheck(vi, arg, len, set);
	if (bcmerror != 0)
		goto exit;

	/* Set up params so get and set can share the convenience variables */
	if (params == NULL) {
		params = arg;
		plen = len;
	}

	if (vi->type == IOVT_VOID)
		val_size = 0;
	else if (vi->type == IOVT_BUFFER)
		val_size = len;
	else
		val_size = sizeof(int);

	if (plen >= (int)sizeof(int_val))
		bcopy(params, &int_val, sizeof(int_val));

	bool_val = (int_val != 0) ? true : false;

	actionid = set ? IOV_SVAL(vi->varid) : IOV_GVAL(vi->varid);
	switch (actionid) {
	case IOV_GVAL(IOV_MSGLEVEL):
		int_val = (s32) sd_msglevel;
		bcopy(&int_val, arg, val_size);
		break;

	case IOV_SVAL(IOV_MSGLEVEL):
		sd_msglevel = int_val;
		break;

	case IOV_GVAL(IOV_BLOCKMODE):
		int_val = (s32) si->sd_blockmode;
		bcopy(&int_val, arg, val_size);
		break;

	case IOV_SVAL(IOV_BLOCKMODE):
		si->sd_blockmode = (bool) int_val;
		/* Haven't figured out how to make non-block mode with DMA */
		break;

	case IOV_GVAL(IOV_BLOCKSIZE):
		if ((u32) int_val > si->num_funcs) {
			bcmerror = BCME_BADARG;
			break;
		}
		int_val = (s32) si->client_block_size[int_val];
		bcopy(&int_val, arg, val_size);
		break;

	case IOV_SVAL(IOV_BLOCKSIZE):
		{
			uint func = ((u32) int_val >> 16);
			uint blksize = (u16) int_val;
			uint maxsize;

			if (func > si->num_funcs) {
				bcmerror = BCME_BADARG;
				break;
			}

			switch (func) {
			case 0:
				maxsize = 32;
				break;
			case 1:
				maxsize = BLOCK_SIZE_4318;
				break;
			case 2:
				maxsize = BLOCK_SIZE_4328;
				break;
			default:
				maxsize = 0;
			}
			if (blksize > maxsize) {
				bcmerror = BCME_BADARG;
				break;
			}
			if (!blksize)
				blksize = maxsize;

			/* Now set it */
			si->client_block_size[func] = blksize;

			break;
		}

	case IOV_GVAL(IOV_RXCHAIN):
		int_val = false;
		bcopy(&int_val, arg, val_size);
		break;

	case IOV_GVAL(IOV_DMA):
		int_val = (s32) si->sd_use_dma;
		bcopy(&int_val, arg, val_size);
		break;

	case IOV_SVAL(IOV_DMA):
		si->sd_use_dma = (bool) int_val;
		break;

	case IOV_GVAL(IOV_USEINTS):
		int_val = (s32) si->use_client_ints;
		bcopy(&int_val, arg, val_size);
		break;

	case IOV_SVAL(IOV_USEINTS):
		si->use_client_ints = (bool) int_val;
		if (si->use_client_ints)
			si->intmask |= CLIENT_INTR;
		else
			si->intmask &= ~CLIENT_INTR;

		break;

	case IOV_GVAL(IOV_DIVISOR):
		int_val = (u32) sd_divisor;
		bcopy(&int_val, arg, val_size);
		break;

	case IOV_SVAL(IOV_DIVISOR):
		sd_divisor = int_val;
		break;

	case IOV_GVAL(IOV_POWER):
		int_val = (u32) sd_power;
		bcopy(&int_val, arg, val_size);
		break;

	case IOV_SVAL(IOV_POWER):
		sd_power = int_val;
		break;

	case IOV_GVAL(IOV_CLOCK):
		int_val = (u32) sd_clock;
		bcopy(&int_val, arg, val_size);
		break;

	case IOV_SVAL(IOV_CLOCK):
		sd_clock = int_val;
		break;

	case IOV_GVAL(IOV_SDMODE):
		int_val = (u32) sd_sdmode;
		bcopy(&int_val, arg, val_size);
		break;

	case IOV_SVAL(IOV_SDMODE):
		sd_sdmode = int_val;
		break;

	case IOV_GVAL(IOV_HISPEED):
		int_val = (u32) sd_hiok;
		bcopy(&int_val, arg, val_size);
		break;

	case IOV_SVAL(IOV_HISPEED):
		sd_hiok = int_val;
		break;

	case IOV_GVAL(IOV_NUMINTS):
		int_val = (s32) si->intrcount;
		bcopy(&int_val, arg, val_size);
		break;

	case IOV_GVAL(IOV_NUMLOCALINTS):
		int_val = (s32) 0;
		bcopy(&int_val, arg, val_size);
		break;

	case IOV_GVAL(IOV_HOSTREG):
		{
			sdreg_t *sd_ptr = (sdreg_t *) params;

			if (sd_ptr->offset < SD_SysAddr
			    || sd_ptr->offset > SD_MaxCurCap) {
				sd_err(("%s: bad offset 0x%x\n", __func__,
					sd_ptr->offset));
				bcmerror = BCME_BADARG;
				break;
			}

			sd_trace(("%s: rreg%d at offset %d\n", __func__,
				  (sd_ptr->offset & 1) ? 8
				  : ((sd_ptr->offset & 2) ? 16 : 32),
				  sd_ptr->offset));
			if (sd_ptr->offset & 1)
				int_val = 8;	/* sdioh_sdmmc_rreg8(si,
						 sd_ptr->offset); */
			else if (sd_ptr->offset & 2)
				int_val = 16;	/* sdioh_sdmmc_rreg16(si,
						 sd_ptr->offset); */
			else
				int_val = 32;	/* sdioh_sdmmc_rreg(si,
						 sd_ptr->offset); */

			bcopy(&int_val, arg, sizeof(int_val));
			break;
		}

	case IOV_SVAL(IOV_HOSTREG):
		{
			sdreg_t *sd_ptr = (sdreg_t *) params;

			if (sd_ptr->offset < SD_SysAddr
			    || sd_ptr->offset > SD_MaxCurCap) {
				sd_err(("%s: bad offset 0x%x\n", __func__,
					sd_ptr->offset));
				bcmerror = BCME_BADARG;
				break;
			}

			sd_trace(("%s: wreg%d value 0x%08x at offset %d\n",
				  __func__, sd_ptr->value,
				  (sd_ptr->offset & 1) ? 8
				  : ((sd_ptr->offset & 2) ? 16 : 32),
				  sd_ptr->offset));
			break;
		}

	case IOV_GVAL(IOV_DEVREG):
		{
			sdreg_t *sd_ptr = (sdreg_t *) params;
			u8 data = 0;

			if (sdioh_cfg_read
			    (si, sd_ptr->func, sd_ptr->offset, &data)) {
				bcmerror = BCME_SDIO_ERROR;
				break;
			}

			int_val = (int)data;
			bcopy(&int_val, arg, sizeof(int_val));
			break;
		}

	case IOV_SVAL(IOV_DEVREG):
		{
			sdreg_t *sd_ptr = (sdreg_t *) params;
			u8 data = (u8) sd_ptr->value;

			if (sdioh_cfg_write
			    (si, sd_ptr->func, sd_ptr->offset, &data)) {
				bcmerror = BCME_SDIO_ERROR;
				break;
			}
			break;
		}

	default:
		bcmerror = BCME_UNSUPPORTED;
		break;
	}
exit:

	return bcmerror;
}

#if defined(OOB_INTR_ONLY) && defined(HW_OOB)

SDIOH_API_RC sdioh_enable_hw_oob_intr(sdioh_info_t *sd, bool enable)
{
	SDIOH_API_RC status;
	u8 data;

	if (enable)
		data = 3;	/* enable hw oob interrupt */
	else
		data = 4;	/* disable hw oob interrupt */
	data |= 4;		/* Active HIGH */

	status = sdioh_request_byte(sd, SDIOH_WRITE, 0, 0xf2, &data);
	return status;
}
#endif				/* defined(OOB_INTR_ONLY) && defined(HW_OOB) */

extern SDIOH_API_RC
sdioh_cfg_read(sdioh_info_t *sd, uint fnc_num, u32 addr, u8 *data)
{
	SDIOH_API_RC status;
	/* No lock needed since sdioh_request_byte does locking */
	status = sdioh_request_byte(sd, SDIOH_READ, fnc_num, addr, data);
	return status;
}

extern SDIOH_API_RC
sdioh_cfg_write(sdioh_info_t *sd, uint fnc_num, u32 addr, u8 *data)
{
	/* No lock needed since sdioh_request_byte does locking */
	SDIOH_API_RC status;
	status = sdioh_request_byte(sd, SDIOH_WRITE, fnc_num, addr, data);
	return status;
}

static int sdioh_sdmmc_get_cisaddr(sdioh_info_t *sd, u32 regaddr)
{
	/* read 24 bits and return valid 17 bit addr */
	int i;
	u32 scratch, regdata;
	u8 *ptr = (u8 *)&scratch;
	for (i = 0; i < 3; i++) {
		if ((sdioh_sdmmc_card_regread(sd, 0, regaddr, 1, &regdata)) !=
		    SUCCESS)
			sd_err(("%s: Can't read!\n", __func__));

		*ptr++ = (u8) regdata;
		regaddr++;
	}

	/* Only the lower 17-bits are valid */
	scratch = ltoh32(scratch);
	scratch &= 0x0001FFFF;
	return scratch;
}

extern SDIOH_API_RC
sdioh_cis_read(sdioh_info_t *sd, uint func, u8 *cisd, u32 length)
{
	u32 count;
	int offset;
	u32 foo;
	u8 *cis = cisd;

	sd_trace(("%s: Func = %d\n", __func__, func));

	if (!sd->func_cis_ptr[func]) {
		bzero(cis, length);
		sd_err(("%s: no func_cis_ptr[%d]\n", __func__, func));
		return SDIOH_API_RC_FAIL;
	}

	sd_err(("%s: func_cis_ptr[%d]=0x%04x\n", __func__, func,
		sd->func_cis_ptr[func]));

	for (count = 0; count < length; count++) {
		offset = sd->func_cis_ptr[func] + count;
		if (sdioh_sdmmc_card_regread(sd, 0, offset, 1, &foo) < 0) {
			sd_err(("%s: regread failed: Can't read CIS\n",
				__func__));
			return SDIOH_API_RC_FAIL;
		}

		*cis = (u8) (foo & 0xff);
		cis++;
	}

	return SDIOH_API_RC_SUCCESS;
}

extern SDIOH_API_RC
sdioh_request_byte(sdioh_info_t *sd, uint rw, uint func, uint regaddr,
		   u8 *byte)
{
	int err_ret;

	sd_info(("%s: rw=%d, func=%d, addr=0x%05x\n", __func__, rw, func,
		 regaddr));

	DHD_PM_RESUME_WAIT(sdioh_request_byte_wait);
	DHD_PM_RESUME_RETURN_ERROR(SDIOH_API_RC_FAIL);
	if (rw) {		/* CMD52 Write */
		if (func == 0) {
			/* Can only directly write to some F0 registers.
			 * Handle F2 enable
			 * as a special case.
			 */
			if (regaddr == SDIOD_CCCR_IOEN) {
				if (gInstance->func[2]) {
					sdio_claim_host(gInstance->func[2]);
					if (*byte & SDIO_FUNC_ENABLE_2) {
						/* Enable Function 2 */
						err_ret =
						    sdio_enable_func
						    (gInstance->func[2]);
						if (err_ret)
							sd_err(("bcmsdh_sdmmc: enable F2 failed:%d",
								 err_ret));
					} else {
						/* Disable Function 2 */
						err_ret =
						    sdio_disable_func
						    (gInstance->func[2]);
						if (err_ret)
							sd_err(("bcmsdh_sdmmc: Disab F2 failed:%d",
								 err_ret));
					}
					sdio_release_host(gInstance->func[2]);
				}
			}
#if defined(MMC_SDIO_ABORT)
			/* to allow abort command through F1 */
			else if (regaddr == SDIOD_CCCR_IOABORT) {
				sdio_claim_host(gInstance->func[func]);
				/*
				 * this sdio_f0_writeb() can be replaced
				 * with another api
				 * depending upon MMC driver change.
				 * As of this time, this is temporaray one
				 */
				sdio_writeb(gInstance->func[func], *byte,
					    regaddr, &err_ret);
				sdio_release_host(gInstance->func[func]);
			}
#endif				/* MMC_SDIO_ABORT */
			else if (regaddr < 0xF0) {
				sd_err(("bcmsdh_sdmmc: F0 Wr:0x%02x: write "
					"disallowed\n", regaddr));
			} else {
				/* Claim host controller, perform F0 write,
				 and release */
				sdio_claim_host(gInstance->func[func]);
				sdio_f0_writeb(gInstance->func[func], *byte,
					       regaddr, &err_ret);
				sdio_release_host(gInstance->func[func]);
			}
		} else {
			/* Claim host controller, perform Fn write,
			 and release */
			sdio_claim_host(gInstance->func[func]);
			sdio_writeb(gInstance->func[func], *byte, regaddr,
				    &err_ret);
			sdio_release_host(gInstance->func[func]);
		}
	} else {		/* CMD52 Read */
		/* Claim host controller, perform Fn read, and release */
		sdio_claim_host(gInstance->func[func]);

		if (func == 0) {
			*byte =
			    sdio_f0_readb(gInstance->func[func], regaddr,
					  &err_ret);
		} else {
			*byte =
			    sdio_readb(gInstance->func[func], regaddr,
				       &err_ret);
		}

		sdio_release_host(gInstance->func[func]);
	}

	if (err_ret)
		sd_err(("bcmsdh_sdmmc: Failed to %s byte F%d:@0x%05x=%02x, "
			"Err: %d\n", rw ? "Write" : "Read", func, regaddr,
			*byte, err_ret));

	return ((err_ret == 0) ? SDIOH_API_RC_SUCCESS : SDIOH_API_RC_FAIL);
}

extern SDIOH_API_RC
sdioh_request_word(sdioh_info_t *sd, uint cmd_type, uint rw, uint func,
		   uint addr, u32 *word, uint nbytes)
{
	int err_ret = SDIOH_API_RC_FAIL;

	if (func == 0) {
		sd_err(("%s: Only CMD52 allowed to F0.\n", __func__));
		return SDIOH_API_RC_FAIL;
	}

	sd_info(("%s: cmd_type=%d, rw=%d, func=%d, addr=0x%05x, nbytes=%d\n",
		 __func__, cmd_type, rw, func, addr, nbytes));

	DHD_PM_RESUME_WAIT(sdioh_request_word_wait);
	DHD_PM_RESUME_RETURN_ERROR(SDIOH_API_RC_FAIL);
	/* Claim host controller */
	sdio_claim_host(gInstance->func[func]);

	if (rw) {		/* CMD52 Write */
		if (nbytes == 4) {
			sdio_writel(gInstance->func[func], *word, addr,
				    &err_ret);
		} else if (nbytes == 2) {
			sdio_writew(gInstance->func[func], (*word & 0xFFFF),
				    addr, &err_ret);
		} else {
			sd_err(("%s: Invalid nbytes: %d\n", __func__, nbytes));
		}
	} else {		/* CMD52 Read */
		if (nbytes == 4) {
			*word =
			    sdio_readl(gInstance->func[func], addr, &err_ret);
		} else if (nbytes == 2) {
			*word =
			    sdio_readw(gInstance->func[func], addr,
				       &err_ret) & 0xFFFF;
		} else {
			sd_err(("%s: Invalid nbytes: %d\n", __func__, nbytes));
		}
	}

	/* Release host controller */
	sdio_release_host(gInstance->func[func]);

	if (err_ret) {
		sd_err(("bcmsdh_sdmmc: Failed to %s word, Err: 0x%08x",
			rw ? "Write" : "Read", err_ret));
	}

	return ((err_ret == 0) ? SDIOH_API_RC_SUCCESS : SDIOH_API_RC_FAIL);
}

static SDIOH_API_RC
sdioh_request_packet(sdioh_info_t *sd, uint fix_inc, uint write, uint func,
		     uint addr, void *pkt)
{
	bool fifo = (fix_inc == SDIOH_DATA_FIX);
	u32 SGCount = 0;
	int err_ret = 0;

	void *pnext;

	sd_trace(("%s: Enter\n", __func__));

	ASSERT(pkt);
	DHD_PM_RESUME_WAIT(sdioh_request_packet_wait);
	DHD_PM_RESUME_RETURN_ERROR(SDIOH_API_RC_FAIL);

	/* Claim host controller */
	sdio_claim_host(gInstance->func[func]);
	for (pnext = pkt; pnext; pnext = PKTNEXT(pnext)) {
		uint pkt_len = PKTLEN(pnext);
		pkt_len += 3;
		pkt_len &= 0xFFFFFFFC;

#ifdef CONFIG_MMC_MSM7X00A
		if ((pkt_len % 64) == 32) {
			sd_trace(("%s: Rounding up TX packet +=32\n",
				  __func__));
			pkt_len += 32;
		}
#endif				/* CONFIG_MMC_MSM7X00A */
		/* Make sure the packet is aligned properly.
		 * If it isn't, then this
		 * is the fault of sdioh_request_buffer() which
		 * is supposed to give
		 * us something we can work with.
		 */
		ASSERT(((u32) (PKTDATA(pkt)) & DMA_ALIGN_MASK) == 0);

		if ((write) && (!fifo)) {
			err_ret = sdio_memcpy_toio(gInstance->func[func], addr,
						   ((u8 *) PKTDATA(pnext)),
						   pkt_len);
		} else if (write) {
			err_ret = sdio_memcpy_toio(gInstance->func[func], addr,
						   ((u8 *) PKTDATA(pnext)),
						   pkt_len);
		} else if (fifo) {
			err_ret = sdio_readsb(gInstance->func[func],
					      ((u8 *) PKTDATA(pnext)),
					      addr, pkt_len);
		} else {
			err_ret = sdio_memcpy_fromio(gInstance->func[func],
						     ((u8 *) PKTDATA(pnext)),
						     addr, pkt_len);
		}

		if (err_ret) {
			sd_err(("%s: %s FAILED %p[%d], addr=0x%05x, pkt_len=%d,"
				 "ERR=0x%08x\n", __func__,
				 (write) ? "TX" : "RX",
				 pnext, SGCount, addr, pkt_len, err_ret));
		} else {
			sd_trace(("%s: %s xfr'd %p[%d], addr=0x%05x, len=%d\n",
				  __func__,
				  (write) ? "TX" : "RX",
				  pnext, SGCount, addr, pkt_len));
		}

		if (!fifo)
			addr += pkt_len;
		SGCount++;

	}

	/* Release host controller */
	sdio_release_host(gInstance->func[func]);

	sd_trace(("%s: Exit\n", __func__));
	return ((err_ret == 0) ? SDIOH_API_RC_SUCCESS : SDIOH_API_RC_FAIL);
}

/*
 * This function takes a buffer or packet, and fixes everything up
 * so that in the
 * end, a DMA-able packet is created.
 *
 * A buffer does not have an associated packet pointer,
 * and may or may not be aligned.
 * A packet may consist of a single packet, or a packet chain.
 * If it is a packet chain,
 * then all the packets in the chain must be properly aligned.
 * If the packet data is not
 * aligned, then there may only be one packet, and in this case,
 * it is copied to a new
 * aligned packet.
 *
 */
extern SDIOH_API_RC
sdioh_request_buffer(sdioh_info_t *sd, uint pio_dma, uint fix_inc, uint write,
		     uint func, uint addr, uint reg_width, uint buflen_u,
		     u8 *buffer, void *pkt)
{
	SDIOH_API_RC Status;
	void *mypkt = NULL;

	sd_trace(("%s: Enter\n", __func__));

	DHD_PM_RESUME_WAIT(sdioh_request_buffer_wait);
	DHD_PM_RESUME_RETURN_ERROR(SDIOH_API_RC_FAIL);
	/* Case 1: we don't have a packet. */
	if (pkt == NULL) {
		sd_data(("%s: Creating new %s Packet, len=%d\n",
			 __func__, write ? "TX" : "RX", buflen_u));
		mypkt = PKTGET(sd->osh, buflen_u, write ? true : false);
		if (!mypkt) {
			sd_err(("%s: PKTGET failed: len %d\n",
				__func__, buflen_u));
			return SDIOH_API_RC_FAIL;
		}

		/* For a write, copy the buffer data into the packet. */
		if (write)
			bcopy(buffer, PKTDATA(mypkt), buflen_u);

		Status =
		    sdioh_request_packet(sd, fix_inc, write, func, addr, mypkt);

		/* For a read, copy the packet data back to the buffer. */
		if (!write)
			bcopy(PKTDATA(mypkt), buffer, buflen_u);

		PKTFREE(sd->osh, mypkt, write ? true : false);
	} else if (((u32) (PKTDATA(pkt)) & DMA_ALIGN_MASK) != 0) {
		/* Case 2: We have a packet, but it is unaligned. */

		/* In this case, we cannot have a chain. */
		ASSERT(PKTNEXT(pkt) == NULL);

		sd_data(("%s: Creating aligned %s Packet, len=%d\n",
			 __func__, write ? "TX" : "RX", PKTLEN(pkt)));
		mypkt = PKTGET(sd->osh, PKTLEN(pkt), write ? true : false);
		if (!mypkt) {
			sd_err(("%s: PKTGET failed: len %d\n",
				__func__, PKTLEN(pkt)));
			return SDIOH_API_RC_FAIL;
		}

		/* For a write, copy the buffer data into the packet. */
		if (write)
			bcopy(PKTDATA(pkt), PKTDATA(mypkt), PKTLEN(pkt));

		Status =
		    sdioh_request_packet(sd, fix_inc, write, func, addr, mypkt);

		/* For a read, copy the packet data back to the buffer. */
		if (!write)
			bcopy(PKTDATA(mypkt), PKTDATA(pkt), PKTLEN(mypkt));

		PKTFREE(sd->osh, mypkt, write ? true : false);
	} else {		/* case 3: We have a packet and
				 it is aligned. */
		sd_data(("%s: Aligned %s Packet, direct DMA\n",
			 __func__, write ? "Tx" : "Rx"));
		Status =
		    sdioh_request_packet(sd, fix_inc, write, func, addr, pkt);
	}

	return Status;
}

/* this function performs "abort" for both of host & device */
extern int sdioh_abort(sdioh_info_t *sd, uint func)
{
#if defined(MMC_SDIO_ABORT)
	char t_func = (char)func;
#endif				/* defined(MMC_SDIO_ABORT) */
	sd_trace(("%s: Enter\n", __func__));

#if defined(MMC_SDIO_ABORT)
	/* issue abort cmd52 command through F1 */
	sdioh_request_byte(sd, SD_IO_OP_WRITE, SDIO_FUNC_0, SDIOD_CCCR_IOABORT,
			   &t_func);
#endif				/* defined(MMC_SDIO_ABORT) */

	sd_trace(("%s: Exit\n", __func__));
	return SDIOH_API_RC_SUCCESS;
}

/* Reset and re-initialize the device */
int sdioh_sdio_reset(sdioh_info_t *si)
{
	sd_trace(("%s: Enter\n", __func__));
	sd_trace(("%s: Exit\n", __func__));
	return SDIOH_API_RC_SUCCESS;
}

/* Disable device interrupt */
void sdioh_sdmmc_devintr_off(sdioh_info_t *sd)
{
	sd_trace(("%s: %d\n", __func__, sd->use_client_ints));
	sd->intmask &= ~CLIENT_INTR;
}

/* Enable device interrupt */
void sdioh_sdmmc_devintr_on(sdioh_info_t *sd)
{
	sd_trace(("%s: %d\n", __func__, sd->use_client_ints));
	sd->intmask |= CLIENT_INTR;
}

/* Read client card reg */
int
sdioh_sdmmc_card_regread(sdioh_info_t *sd, int func, u32 regaddr,
			 int regsize, u32 *data)
{

	if ((func == 0) || (regsize == 1)) {
		u8 temp = 0;

		sdioh_request_byte(sd, SDIOH_READ, func, regaddr, &temp);
		*data = temp;
		*data &= 0xff;
		sd_data(("%s: byte read data=0x%02x\n", __func__, *data));
	} else {
		sdioh_request_word(sd, 0, SDIOH_READ, func, regaddr, data,
				   regsize);
		if (regsize == 2)
			*data &= 0xffff;

		sd_data(("%s: word read data=0x%08x\n", __func__, *data));
	}

	return SUCCESS;
}

#if !defined(OOB_INTR_ONLY)
/* bcmsdh_sdmmc interrupt handler */
static void IRQHandler(struct sdio_func *func)
{
	sdioh_info_t *sd;

	sd_trace(("bcmsdh_sdmmc: ***IRQHandler\n"));
	sd = gInstance->sd;

	ASSERT(sd != NULL);
	sdio_release_host(gInstance->func[0]);

	if (sd->use_client_ints) {
		sd->intrcount++;
		ASSERT(sd->intr_handler);
		ASSERT(sd->intr_handler_arg);
		(sd->intr_handler) (sd->intr_handler_arg);
	} else {
		sd_err(("bcmsdh_sdmmc: ***IRQHandler\n"));

		sd_err(("%s: Not ready for intr: enabled %d, handler %p\n",
			__func__, sd->client_intr_enabled, sd->intr_handler));
	}

	sdio_claim_host(gInstance->func[0]);
}

/* bcmsdh_sdmmc interrupt handler for F2 (dummy handler) */
static void IRQHandlerF2(struct sdio_func *func)
{
	sdioh_info_t *sd;

	sd_trace(("bcmsdh_sdmmc: ***IRQHandlerF2\n"));

	sd = gInstance->sd;

	ASSERT(sd != NULL);
}
#endif				/* !defined(OOB_INTR_ONLY) */

#ifdef NOTUSED
/* Write client card reg */
static int
sdioh_sdmmc_card_regwrite(sdioh_info_t *sd, int func, u32 regaddr,
			  int regsize, u32 data)
{

	if ((func == 0) || (regsize == 1)) {
		u8 temp;

		temp = data & 0xff;
		sdioh_request_byte(sd, SDIOH_READ, func, regaddr, &temp);
		sd_data(("%s: byte write data=0x%02x\n", __func__, data));
	} else {
		if (regsize == 2)
			data &= 0xffff;

		sdioh_request_word(sd, 0, SDIOH_READ, func, regaddr, &data,
				   regsize);

		sd_data(("%s: word write data=0x%08x\n", __func__, data));
	}

	return SUCCESS;
}
#endif				/* NOTUSED */

int sdioh_start(sdioh_info_t *si, int stage)
{
	return 0;
}

int sdioh_stop(sdioh_info_t *si)
{
	return 0;
}