255 lines
6.2 KiB
C
255 lines
6.2 KiB
C
/*
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* Broadcom SPI Host Controller Driver - Linux Per-port
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*
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* Portions of this code are copyright (c) 2017 Cypress Semiconductor Corporation
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*
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* Copyright (C) 1999-2017, Broadcom Corporation
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*
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* Unless you and Broadcom execute a separate written software license
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* agreement governing use of this software, this software is licensed to you
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* under the terms of the GNU General Public License version 2 (the "GPL"),
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* available at http://www.broadcom.com/licenses/GPLv2.php, with the
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* following added to such license:
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*
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* As a special exception, the copyright holders of this software give you
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* permission to link this software with independent modules, and to copy and
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* distribute the resulting executable under terms of your choice, provided that
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* you also meet, for each linked independent module, the terms and conditions of
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* the license of that module. An independent module is a module which is not
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* derived from this software. The special exception does not apply to any
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* modifications of the software.
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*
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* Notwithstanding the above, under no circumstances may you combine this
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* software in any way with any other Broadcom software provided under a license
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* other than the GPL, without Broadcom's express prior written consent.
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*
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*
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* <<Broadcom-WL-IPTag/Open:>>
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*
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* $Id: bcmsdspi_linux.c 514727 2014-11-12 03:02:48Z $
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*/
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#include <typedefs.h>
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#include <bcmutils.h>
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#include <bcmsdbus.h> /* bcmsdh to/from specific controller APIs */
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#include <sdiovar.h> /* to get msglevel bit values */
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#include <pcicfg.h>
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#include <sdio.h> /* SDIO Device and Protocol Specs */
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#include <linux/sched.h> /* request_irq(), free_irq() */
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#include <bcmsdspi.h>
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#include <bcmspi.h>
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extern uint sd_crc;
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module_param(sd_crc, uint, 0);
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
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#define KERNEL26
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#endif
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struct sdos_info {
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sdioh_info_t *sd;
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spinlock_t lock;
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wait_queue_head_t intr_wait_queue;
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};
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
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#define BLOCKABLE() (!in_atomic())
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#else
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#define BLOCKABLE() (!in_interrupt())
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#endif
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/* Interrupt handler */
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static irqreturn_t
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sdspi_isr(int irq, void *dev_id
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20)
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, struct pt_regs *ptregs
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#endif
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)
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{
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sdioh_info_t *sd;
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struct sdos_info *sdos;
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bool ours;
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sd = (sdioh_info_t *)dev_id;
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sd->local_intrcount++;
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if (!sd->card_init_done) {
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sd_err(("%s: Hey Bogus intr...not even initted: irq %d\n", __FUNCTION__, irq));
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return IRQ_RETVAL(FALSE);
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} else {
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ours = spi_check_client_intr(sd, NULL);
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/* For local interrupts, wake the waiting process */
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if (ours && sd->got_hcint) {
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sdos = (struct sdos_info *)sd->sdos_info;
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wake_up_interruptible(&sdos->intr_wait_queue);
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}
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return IRQ_RETVAL(ours);
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}
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}
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/* Register with Linux for interrupts */
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int
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spi_register_irq(sdioh_info_t *sd, uint irq)
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{
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sd_trace(("Entering %s: irq == %d\n", __FUNCTION__, irq));
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if (request_irq(irq, sdspi_isr, IRQF_SHARED, "bcmsdspi", sd) < 0) {
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sd_err(("%s: request_irq() failed\n", __FUNCTION__));
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return ERROR;
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}
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return SUCCESS;
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}
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/* Free Linux irq */
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void
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spi_free_irq(uint irq, sdioh_info_t *sd)
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{
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free_irq(irq, sd);
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}
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/* Map Host controller registers */
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uint32 *
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spi_reg_map(osl_t *osh, uintptr addr, int size)
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{
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return (uint32 *)REG_MAP(addr, size);
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}
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void
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spi_reg_unmap(osl_t *osh, uintptr addr, int size)
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{
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REG_UNMAP((void*)(uintptr)addr);
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}
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int
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spi_osinit(sdioh_info_t *sd)
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{
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struct sdos_info *sdos;
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sdos = (struct sdos_info*)MALLOC(sd->osh, sizeof(struct sdos_info));
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sd->sdos_info = (void*)sdos;
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if (sdos == NULL)
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return BCME_NOMEM;
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sdos->sd = sd;
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spin_lock_init(&sdos->lock);
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init_waitqueue_head(&sdos->intr_wait_queue);
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return BCME_OK;
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}
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void
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spi_osfree(sdioh_info_t *sd)
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{
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struct sdos_info *sdos;
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ASSERT(sd && sd->sdos_info);
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sdos = (struct sdos_info *)sd->sdos_info;
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MFREE(sd->osh, sdos, sizeof(struct sdos_info));
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}
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/* Interrupt enable/disable */
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SDIOH_API_RC
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sdioh_interrupt_set(sdioh_info_t *sd, bool enable)
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{
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ulong flags;
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struct sdos_info *sdos;
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sd_trace(("%s: %s\n", __FUNCTION__, enable ? "Enabling" : "Disabling"));
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sdos = (struct sdos_info *)sd->sdos_info;
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ASSERT(sdos);
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if (!(sd->host_init_done && sd->card_init_done)) {
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sd_err(("%s: Card & Host are not initted - bailing\n", __FUNCTION__));
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return SDIOH_API_RC_FAIL;
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}
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if (enable && !(sd->intr_handler && sd->intr_handler_arg)) {
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sd_err(("%s: no handler registered, will not enable\n", __FUNCTION__));
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return SDIOH_API_RC_FAIL;
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}
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/* Ensure atomicity for enable/disable calls */
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spin_lock_irqsave(&sdos->lock, flags);
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sd->client_intr_enabled = enable;
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if (enable && !sd->lockcount)
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spi_devintr_on(sd);
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else
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spi_devintr_off(sd);
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spin_unlock_irqrestore(&sdos->lock, flags);
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return SDIOH_API_RC_SUCCESS;
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}
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/* Protect against reentrancy (disable device interrupts while executing) */
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void
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spi_lock(sdioh_info_t *sd)
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{
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ulong flags;
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struct sdos_info *sdos;
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sdos = (struct sdos_info *)sd->sdos_info;
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ASSERT(sdos);
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sd_trace(("%s: %d\n", __FUNCTION__, sd->lockcount));
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spin_lock_irqsave(&sdos->lock, flags);
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if (sd->lockcount) {
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sd_err(("%s: Already locked!\n", __FUNCTION__));
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ASSERT(sd->lockcount == 0);
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}
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spi_devintr_off(sd);
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sd->lockcount++;
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spin_unlock_irqrestore(&sdos->lock, flags);
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}
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/* Enable client interrupt */
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void
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spi_unlock(sdioh_info_t *sd)
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{
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ulong flags;
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struct sdos_info *sdos;
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sd_trace(("%s: %d, %d\n", __FUNCTION__, sd->lockcount, sd->client_intr_enabled));
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ASSERT(sd->lockcount > 0);
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sdos = (struct sdos_info *)sd->sdos_info;
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ASSERT(sdos);
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spin_lock_irqsave(&sdos->lock, flags);
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if (--sd->lockcount == 0 && sd->client_intr_enabled) {
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spi_devintr_on(sd);
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}
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spin_unlock_irqrestore(&sdos->lock, flags);
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}
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void spi_waitbits(sdioh_info_t *sd, bool yield)
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{
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#ifndef BCMSDYIELD
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ASSERT(!yield);
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#endif
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sd_trace(("%s: yield %d canblock %d\n",
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__FUNCTION__, yield, BLOCKABLE()));
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/* Clear the "interrupt happened" flag and last intrstatus */
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sd->got_hcint = FALSE;
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#ifdef BCMSDYIELD
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if (yield && BLOCKABLE()) {
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struct sdos_info *sdos;
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sdos = (struct sdos_info *)sd->sdos_info;
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/* Wait for the indication, the interrupt will be masked when the ISR fires. */
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wait_event_interruptible(sdos->intr_wait_queue, (sd->got_hcint));
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} else
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#endif /* BCMSDYIELD */
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{
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spi_spinbits(sd);
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}
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}
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