diff options
Diffstat (limited to 'drivers/net/wireless/bcm4329/bcmsdspi_linux.c')
| -rw-r--r-- | drivers/net/wireless/bcm4329/bcmsdspi_linux.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/drivers/net/wireless/bcm4329/bcmsdspi_linux.c b/drivers/net/wireless/bcm4329/bcmsdspi_linux.c new file mode 100644 index 000000000000..e2e0ca6abe46 --- /dev/null +++ b/drivers/net/wireless/bcm4329/bcmsdspi_linux.c @@ -0,0 +1,252 @@ +/* + * Broadcom SPI Host Controller Driver - Linux Per-port + * + * 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: bcmsdspi_linux.c,v 1.7.2.1.4.3 2008/06/30 21:09:36 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(), free_irq() */ + +#include <bcmsdspi.h> +#include <bcmspi.h> + +extern uint sd_crc; +module_param(sd_crc, uint, 0); + +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)) +#define KERNEL26 +#endif + +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 +sdspi_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; + sd->local_intrcount++; + + 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 = spi_check_client_intr(sd, NULL); + + /* For local interrupts, wake the waiting process */ + if (ours && sd->got_hcint) { + sdos = (struct sdos_info *)sd->sdos_info; + wake_up_interruptible(&sdos->intr_wait_queue); + } + + return IRQ_RETVAL(ours); + } +} + +/* Register with Linux for interrupts */ +int +spi_register_irq(sdioh_info_t *sd, uint irq) +{ + sd_trace(("Entering %s: irq == %d\n", __FUNCTION__, irq)); + if (request_irq(irq, sdspi_isr, IRQF_SHARED, "bcmsdspi", sd) < 0) { + sd_err(("%s: request_irq() failed\n", __FUNCTION__)); + return ERROR; + } + return SUCCESS; +} + +/* Free Linux irq */ +void +spi_free_irq(uint irq, sdioh_info_t *sd) +{ + free_irq(irq, sd); +} + +/* Map Host controller registers */ + +uint32 * +spi_reg_map(osl_t *osh, uintptr addr, int size) +{ + return (uint32 *)REG_MAP(addr, size); +} + +void +spi_reg_unmap(osl_t *osh, uintptr addr, int size) +{ + REG_UNMAP((void*)(uintptr)addr); +} + +int +spi_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 +spi_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) + spi_devintr_on(sd); + else + spi_devintr_off(sd); + + spin_unlock_irqrestore(&sdos->lock, flags); + + return SDIOH_API_RC_SUCCESS; +} + +/* Protect against reentrancy (disable device interrupts while executing) */ +void +spi_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!\n", __FUNCTION__)); + ASSERT(sd->lockcount == 0); + } + spi_devintr_off(sd); + sd->lockcount++; + spin_unlock_irqrestore(&sdos->lock, flags); +} + +/* Enable client interrupt */ +void +spi_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) { + spi_devintr_on(sd); + } + spin_unlock_irqrestore(&sdos->lock, flags); +} + +void spi_waitbits(sdioh_info_t *sd, bool yield) +{ + struct sdos_info *sdos; + + sdos = (struct sdos_info *)sd->sdos_info; + +#ifndef BCMSDYIELD + ASSERT(!yield); +#endif + sd_trace(("%s: yield %d canblock %d\n", + __FUNCTION__, yield, BLOCKABLE())); + + /* Clear the "interrupt happened" flag and last intrstatus */ + sd->got_hcint = FALSE; + +#ifdef BCMSDYIELD + if (yield && BLOCKABLE()) { + /* Wait for the indication, the interrupt will be masked when the ISR fires. */ + wait_event_interruptible(sdos->intr_wait_queue, (sd->got_hcint)); + } else +#endif /* BCMSDYIELD */ + { + spi_spinbits(sd); + } + +} |