--- /dev/null
+/*
+ * Broadcom SPI Host Controller Driver - Linux Per-port
+ *
+ * Copyright (C) 1999-2009, 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);
+ }
+
+}
projects / bootloader-ap.git / blobdiff