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/*
* 'Standard' SDIO HOST CONTROLLER driver - linux portion
*
* Copyright (C) 1999-2010, Broadcom Corporation
*
* Unless you and Broadcom execute a separate written software license
* agreement governing use of this software, this software is licensed to you
* under the terms of the GNU General Public License version 2 (the "GPL"),
* available at http://www.broadcom.com/licenses/GPLv2.php, with the
* following added to such license:
*
* As a special exception, the copyright holders of this software give you
* permission to link this software with independent modules, and to copy and
* distribute the resulting executable under terms of your choice, provided that
* you also meet, for each linked independent module, the terms and conditions of
* the license of that module. An independent module is a module which is not
* derived from this software. The special exception does not apply to any
* modifications of the software.
*
* Notwithstanding the above, under no circumstances may you combine this
* software in any way with any other Broadcom software provided under a license
* other than the GPL, without Broadcom's express prior written consent.
*
* $Id: bcmsdstd_linux.c,v 1.11.18.2.16.1 2010/08/17 17:03:13 Exp $
*/
#include <typedefs.h>
#include <pcicfg.h>
#include <bcmutils.h>
#include <sdio.h> /* SDIO Specs */
#include <bcmsdbus.h> /* bcmsdh to/from specific controller APIs */
#include <sdiovar.h> /* to get msglevel bit values */
#include <linux/sched.h> /* request_irq() */
#include <bcmsdstd.h>
struct sdos_info {
sdioh_info_t *sd;
spinlock_t lock;
wait_queue_head_t intr_wait_queue;
};
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
#define BLOCKABLE() (!in_atomic())
#else
#define BLOCKABLE() (!in_interrupt())
#endif
/* Interrupt handler */
static irqreturn_t
sdstd_isr(int irq, void *dev_id
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20)
, struct pt_regs *ptregs
#endif
)
{
sdioh_info_t *sd;
struct sdos_info *sdos;
bool ours;
sd = (sdioh_info_t *)dev_id;
if (!sd->card_init_done) {
sd_err(("%s: Hey Bogus intr...not even initted: irq %d\n", __FUNCTION__, irq));
return IRQ_RETVAL(FALSE);
} else {
ours = check_client_intr(sd);
/* For local interrupts, wake the waiting process */
if (ours && sd->got_hcint) {
sd_trace(("INTR->WAKE\n"));
sdos = (struct sdos_info *)sd->sdos_info;
wake_up_interruptible(&sdos->intr_wait_queue);
}
return IRQ_RETVAL(ours);
}
}
/* Register with Linux for interrupts */
int
sdstd_register_irq(sdioh_info_t *sd, uint irq)
{
sd_trace(("Entering %s: irq == %d\n", __FUNCTION__, irq));
if (request_irq(irq, sdstd_isr, IRQF_SHARED, "bcmsdstd", sd) < 0) {
sd_err(("%s: request_irq() failed\n", __FUNCTION__));
return ERROR;
}
return SUCCESS;
}
/* Free Linux irq */
void
sdstd_free_irq(uint irq, sdioh_info_t *sd)
{
free_irq(irq, sd);
}
/* Map Host controller registers */
uint32 *
sdstd_reg_map(osl_t *osh, int32 addr, int size)
{
return (uint32 *)REG_MAP(addr, size);
}
void
sdstd_reg_unmap(osl_t *osh, int32 addr, int size)
{
REG_UNMAP((void*)(uintptr)addr);
}
int
sdstd_osinit(sdioh_info_t *sd)
{
struct sdos_info *sdos;
sdos = (struct sdos_info*)MALLOC(sd->osh, sizeof(struct sdos_info));
sd->sdos_info = (void*)sdos;
if (sdos == NULL)
return BCME_NOMEM;
sdos->sd = sd;
spin_lock_init(&sdos->lock);
init_waitqueue_head(&sdos->intr_wait_queue);
return BCME_OK;
}
void
sdstd_osfree(sdioh_info_t *sd)
{
struct sdos_info *sdos;
ASSERT(sd && sd->sdos_info);
sdos = (struct sdos_info *)sd->sdos_info;
MFREE(sd->osh, sdos, sizeof(struct sdos_info));
}
/* Interrupt enable/disable */
SDIOH_API_RC
sdioh_interrupt_set(sdioh_info_t *sd, bool enable)
{
ulong flags;
struct sdos_info *sdos;
sd_trace(("%s: %s\n", __FUNCTION__, enable ? "Enabling" : "Disabling"));
sdos = (struct sdos_info *)sd->sdos_info;
ASSERT(sdos);
if (!(sd->host_init_done && sd->card_init_done)) {
sd_err(("%s: Card & Host are not initted - bailing\n", __FUNCTION__));
return SDIOH_API_RC_FAIL;
}
if (enable && !(sd->intr_handler && sd->intr_handler_arg)) {
sd_err(("%s: no handler registered, will not enable\n", __FUNCTION__));
return SDIOH_API_RC_FAIL;
}
/* Ensure atomicity for enable/disable calls */
spin_lock_irqsave(&sdos->lock, flags);
sd->client_intr_enabled = enable;
if (enable && !sd->lockcount)
sdstd_devintr_on(sd);
else
sdstd_devintr_off(sd);
spin_unlock_irqrestore(&sdos->lock, flags);
return SDIOH_API_RC_SUCCESS;
}
/* Protect against reentrancy (disable device interrupts while executing) */
void
sdstd_lock(sdioh_info_t *sd)
{
ulong flags;
struct sdos_info *sdos;
sdos = (struct sdos_info *)sd->sdos_info;
ASSERT(sdos);
sd_trace(("%s: %d\n", __FUNCTION__, sd->lockcount));
spin_lock_irqsave(&sdos->lock, flags);
if (sd->lockcount) {
sd_err(("%s: Already locked! called from %p\n",
__FUNCTION__,
__builtin_return_address(0)));
ASSERT(sd->lockcount == 0);
}
sdstd_devintr_off(sd);
sd->lockcount++;
spin_unlock_irqrestore(&sdos->lock, flags);
}
/* Enable client interrupt */
void
sdstd_unlock(sdioh_info_t *sd)
{
ulong flags;
struct sdos_info *sdos;
sd_trace(("%s: %d, %d\n", __FUNCTION__, sd->lockcount, sd->client_intr_enabled));
ASSERT(sd->lockcount > 0);
sdos = (struct sdos_info *)sd->sdos_info;
ASSERT(sdos);
spin_lock_irqsave(&sdos->lock, flags);
if (--sd->lockcount == 0 && sd->client_intr_enabled) {
sdstd_devintr_on(sd);
}
spin_unlock_irqrestore(&sdos->lock, flags);
}
uint16
sdstd_waitbits(sdioh_info_t *sd, uint16 norm, uint16 err, bool yield)
{
struct sdos_info *sdos;
sdos = (struct sdos_info *)sd->sdos_info;
#ifndef BCMSDYIELD
ASSERT(!yield);
#endif
sd_trace(("%s: int 0x%02x err 0x%02x yield %d canblock %d\n",
__FUNCTION__, norm, err, yield, BLOCKABLE()));
/* Clear the "interrupt happened" flag and last intrstatus */
sd->got_hcint = FALSE;
sd->last_intrstatus = 0;
#ifdef BCMSDYIELD
if (yield && BLOCKABLE()) {
/* Enable interrupts, wait for the indication, then disable */
sdstd_intrs_on(sd, norm, err);
wait_event_interruptible(sdos->intr_wait_queue, (sd->got_hcint));
sdstd_intrs_off(sd, norm, err);
} else
#endif /* BCMSDYIELD */
{
sdstd_spinbits(sd, norm, err);
}
sd_trace(("%s: last_intrstatus 0x%04x\n", __FUNCTION__, sd->last_intrstatus));
return sd->last_intrstatus;
}
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