--- /dev/null
+/*
+ * File: bf5xx_sport.c
+ * Based on:
+ * Author: Roy Huang <roy.huang@analog.com>
+ *
+ * Created: Tue Sep 21 10:52:42 CEST 2004
+ * Description:
+ * Blackfin SPORT Driver
+ *
+ * Copyright 2004-2007 Analog Devices Inc.
+ *
+ * Bugs: Enter bugs at http://blackfin.uclinux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/gpio.h>
+#include <linux/bug.h>
+#include <asm/portmux.h>
+#include <asm/dma.h>
+#include <asm/blackfin.h>
+#include <asm/cacheflush.h>
+
+#include "bf5xx-sport.h"
+/* delay between frame sync pulse and first data bit in multichannel mode */
+#define FRAME_DELAY (1<<12)
+
+struct sport_device *sport_handle;
+EXPORT_SYMBOL(sport_handle);
+/* note: multichannel is in units of 8 channels,
+ * tdm_count is # channels NOT / 8 ! */
+int sport_set_multichannel(struct sport_device *sport,
+ int tdm_count, u32 mask, int packed)
+{
+ pr_debug("%s tdm_count=%d mask:0x%08x packed=%d\n", __func__,
+ tdm_count, mask, packed);
+
+ if ((sport->regs->tcr1 & TSPEN) || (sport->regs->rcr1 & RSPEN))
+ return -EBUSY;
+
+ if (tdm_count & 0x7)
+ return -EINVAL;
+
+ if (tdm_count > 32)
+ return -EINVAL; /* Only support less than 32 channels now */
+
+ if (tdm_count) {
+ sport->regs->mcmc1 = ((tdm_count>>3)-1) << 12;
+ sport->regs->mcmc2 = FRAME_DELAY | MCMEN | \
+ (packed ? (MCDTXPE|MCDRXPE) : 0);
+
+ sport->regs->mtcs0 = mask;
+ sport->regs->mrcs0 = mask;
+ sport->regs->mtcs1 = 0;
+ sport->regs->mrcs1 = 0;
+ sport->regs->mtcs2 = 0;
+ sport->regs->mrcs2 = 0;
+ sport->regs->mtcs3 = 0;
+ sport->regs->mrcs3 = 0;
+ } else {
+ sport->regs->mcmc1 = 0;
+ sport->regs->mcmc2 = 0;
+
+ sport->regs->mtcs0 = 0;
+ sport->regs->mrcs0 = 0;
+ }
+
+ sport->regs->mtcs1 = 0; sport->regs->mtcs2 = 0; sport->regs->mtcs3 = 0;
+ sport->regs->mrcs1 = 0; sport->regs->mrcs2 = 0; sport->regs->mrcs3 = 0;
+
+ SSYNC();
+
+ return 0;
+}
+EXPORT_SYMBOL(sport_set_multichannel);
+
+int sport_config_rx(struct sport_device *sport, unsigned int rcr1,
+ unsigned int rcr2, unsigned int clkdiv, unsigned int fsdiv)
+{
+ if ((sport->regs->tcr1 & TSPEN) || (sport->regs->rcr1 & RSPEN))
+ return -EBUSY;
+
+ sport->regs->rcr1 = rcr1;
+ sport->regs->rcr2 = rcr2;
+ sport->regs->rclkdiv = clkdiv;
+ sport->regs->rfsdiv = fsdiv;
+
+ SSYNC();
+
+ return 0;
+}
+EXPORT_SYMBOL(sport_config_rx);
+
+int sport_config_tx(struct sport_device *sport, unsigned int tcr1,
+ unsigned int tcr2, unsigned int clkdiv, unsigned int fsdiv)
+{
+ if ((sport->regs->tcr1 & TSPEN) || (sport->regs->rcr1 & RSPEN))
+ return -EBUSY;
+
+ sport->regs->tcr1 = tcr1;
+ sport->regs->tcr2 = tcr2;
+ sport->regs->tclkdiv = clkdiv;
+ sport->regs->tfsdiv = fsdiv;
+
+ SSYNC();
+
+ return 0;
+}
+EXPORT_SYMBOL(sport_config_tx);
+
+static void setup_desc(struct dmasg *desc, void *buf, int fragcount,
+ size_t fragsize, unsigned int cfg,
+ unsigned int x_count, unsigned int ycount, size_t wdsize)
+{
+
+ int i;
+
+ for (i = 0; i < fragcount; ++i) {
+ desc[i].next_desc_addr = (unsigned long)&(desc[i + 1]);
+ desc[i].start_addr = (unsigned long)buf + i*fragsize;
+ desc[i].cfg = cfg;
+ desc[i].x_count = x_count;
+ desc[i].x_modify = wdsize;
+ desc[i].y_count = ycount;
+ desc[i].y_modify = wdsize;
+ }
+
+ /* make circular */
+ desc[fragcount-1].next_desc_addr = (unsigned long)desc;
+
+ pr_debug("setup desc: desc0=%p, next0=%lx, desc1=%p,"
+ "next1=%lx\nx_count=%x,y_count=%x,addr=0x%lx,cfs=0x%x\n",
+ &(desc[0]), desc[0].next_desc_addr,
+ &(desc[1]), desc[1].next_desc_addr,
+ desc[0].x_count, desc[0].y_count,
+ desc[0].start_addr, desc[0].cfg);
+}
+
+static int sport_start(struct sport_device *sport)
+{
+ enable_dma(sport->dma_rx_chan);
+ enable_dma(sport->dma_tx_chan);
+ sport->regs->rcr1 |= RSPEN;
+ sport->regs->tcr1 |= TSPEN;
+ SSYNC();
+
+ return 0;
+}
+
+static int sport_stop(struct sport_device *sport)
+{
+ sport->regs->tcr1 &= ~TSPEN;
+ sport->regs->rcr1 &= ~RSPEN;
+ SSYNC();
+
+ disable_dma(sport->dma_rx_chan);
+ disable_dma(sport->dma_tx_chan);
+ return 0;
+}
+
+static inline int sport_hook_rx_dummy(struct sport_device *sport)
+{
+ struct dmasg *desc, temp_desc;
+ unsigned long flags;
+
+ BUG_ON(sport->dummy_rx_desc == NULL);
+ BUG_ON(sport->curr_rx_desc == sport->dummy_rx_desc);
+
+ /* Maybe the dummy buffer descriptor ring is damaged */
+ sport->dummy_rx_desc->next_desc_addr = \
+ (unsigned long)(sport->dummy_rx_desc+1);
+
+ local_irq_save(flags);
+ desc = (struct dmasg *)get_dma_next_desc_ptr(sport->dma_rx_chan);
+ /* Copy the descriptor which will be damaged to backup */
+ temp_desc = *desc;
+ desc->x_count = 0xa;
+ desc->y_count = 0;
+ desc->next_desc_addr = (unsigned long)(sport->dummy_rx_desc);
+ local_irq_restore(flags);
+ /* Waiting for dummy buffer descriptor is already hooked*/
+ while ((get_dma_curr_desc_ptr(sport->dma_rx_chan) -
+ sizeof(struct dmasg)) !=
+ (unsigned long)sport->dummy_rx_desc)
+ ;
+ sport->curr_rx_desc = sport->dummy_rx_desc;
+ /* Restore the damaged descriptor */
+ *desc = temp_desc;
+
+ return 0;
+}
+
+static inline int sport_rx_dma_start(struct sport_device *sport, int dummy)
+{
+ if (dummy) {
+ sport->dummy_rx_desc->next_desc_addr = \
+ (unsigned long) sport->dummy_rx_desc;
+ sport->curr_rx_desc = sport->dummy_rx_desc;
+ } else
+ sport->curr_rx_desc = sport->dma_rx_desc;
+
+ set_dma_next_desc_addr(sport->dma_rx_chan, \
+ (unsigned long)(sport->curr_rx_desc));
+ set_dma_x_count(sport->dma_rx_chan, 0);
+ set_dma_x_modify(sport->dma_rx_chan, 0);
+ set_dma_config(sport->dma_rx_chan, (DMAFLOW_LARGE | NDSIZE_9 | \
+ WDSIZE_32 | WNR));
+ set_dma_curr_addr(sport->dma_rx_chan, sport->curr_rx_desc->start_addr);
+ SSYNC();
+
+ return 0;
+}
+
+static inline int sport_tx_dma_start(struct sport_device *sport, int dummy)
+{
+ if (dummy) {
+ sport->dummy_tx_desc->next_desc_addr = \
+ (unsigned long) sport->dummy_tx_desc;
+ sport->curr_tx_desc = sport->dummy_tx_desc;
+ } else
+ sport->curr_tx_desc = sport->dma_tx_desc;
+
+ set_dma_next_desc_addr(sport->dma_tx_chan, \
+ (unsigned long)(sport->curr_tx_desc));
+ set_dma_x_count(sport->dma_tx_chan, 0);
+ set_dma_x_modify(sport->dma_tx_chan, 0);
+ set_dma_config(sport->dma_tx_chan,
+ (DMAFLOW_LARGE | NDSIZE_9 | WDSIZE_32));
+ set_dma_curr_addr(sport->dma_tx_chan, sport->curr_tx_desc->start_addr);
+ SSYNC();
+
+ return 0;
+}
+
+int sport_rx_start(struct sport_device *sport)
+{
+ unsigned long flags;
+ pr_debug("%s enter\n", __func__);
+ if (sport->rx_run)
+ return -EBUSY;
+ if (sport->tx_run) {
+ /* tx is running, rx is not running */
+ BUG_ON(sport->dma_rx_desc == NULL);
+ BUG_ON(sport->curr_rx_desc != sport->dummy_rx_desc);
+ local_irq_save(flags);
+ while ((get_dma_curr_desc_ptr(sport->dma_rx_chan) -
+ sizeof(struct dmasg)) !=
+ (unsigned long)sport->dummy_rx_desc)
+ ;
+ sport->dummy_rx_desc->next_desc_addr =
+ (unsigned long)(sport->dma_rx_desc);
+ local_irq_restore(flags);
+ sport->curr_rx_desc = sport->dma_rx_desc;
+ } else {
+ sport_tx_dma_start(sport, 1);
+ sport_rx_dma_start(sport, 0);
+ sport_start(sport);
+ }
+
+ sport->rx_run = 1;
+
+ return 0;
+}
+EXPORT_SYMBOL(sport_rx_start);
+
+int sport_rx_stop(struct sport_device *sport)
+{
+ pr_debug("%s enter\n", __func__);
+
+ if (!sport->rx_run)
+ return 0;
+ if (sport->tx_run) {
+ /* TX dma is still running, hook the dummy buffer */
+ sport_hook_rx_dummy(sport);
+ } else {
+ /* Both rx and tx dma will be stopped */
+ sport_stop(sport);
+ sport->curr_rx_desc = NULL;
+ sport->curr_tx_desc = NULL;
+ }
+
+ sport->rx_run = 0;
+
+ return 0;
+}
+EXPORT_SYMBOL(sport_rx_stop);
+
+static inline int sport_hook_tx_dummy(struct sport_device *sport)
+{
+ struct dmasg *desc, temp_desc;
+ unsigned long flags;
+
+ BUG_ON(sport->dummy_tx_desc == NULL);
+ BUG_ON(sport->curr_tx_desc == sport->dummy_tx_desc);
+
+ sport->dummy_tx_desc->next_desc_addr = \
+ (unsigned long)(sport->dummy_tx_desc+1);
+
+ /* Shorten the time on last normal descriptor */
+ local_irq_save(flags);
+ desc = (struct dmasg *)get_dma_next_desc_ptr(sport->dma_tx_chan);
+ /* Store the descriptor which will be damaged */
+ temp_desc = *desc;
+ desc->x_count = 0xa;
+ desc->y_count = 0;
+ desc->next_desc_addr = (unsigned long)(sport->dummy_tx_desc);
+ local_irq_restore(flags);
+ /* Waiting for dummy buffer descriptor is already hooked*/
+ while ((get_dma_curr_desc_ptr(sport->dma_tx_chan) - \
+ sizeof(struct dmasg)) != \
+ (unsigned long)sport->dummy_tx_desc)
+ ;
+ sport->curr_tx_desc = sport->dummy_tx_desc;
+ /* Restore the damaged descriptor */
+ *desc = temp_desc;
+
+ return 0;
+}
+
+int sport_tx_start(struct sport_device *sport)
+{
+ unsigned flags;
+ pr_debug("%s: tx_run:%d, rx_run:%d\n", __func__,
+ sport->tx_run, sport->rx_run);
+ if (sport->tx_run)
+ return -EBUSY;
+ if (sport->rx_run) {
+ BUG_ON(sport->dma_tx_desc == NULL);
+ BUG_ON(sport->curr_tx_desc != sport->dummy_tx_desc);
+ /* Hook the normal buffer descriptor */
+ local_irq_save(flags);
+ while ((get_dma_curr_desc_ptr(sport->dma_tx_chan) -
+ sizeof(struct dmasg)) !=
+ (unsigned long)sport->dummy_tx_desc)
+ ;
+ sport->dummy_tx_desc->next_desc_addr =
+ (unsigned long)(sport->dma_tx_desc);
+ local_irq_restore(flags);
+ sport->curr_tx_desc = sport->dma_tx_desc;
+ } else {
+
+ sport_tx_dma_start(sport, 0);
+ /* Let rx dma run the dummy buffer */
+ sport_rx_dma_start(sport, 1);
+ sport_start(sport);
+ }
+ sport->tx_run = 1;
+ return 0;
+}
+EXPORT_SYMBOL(sport_tx_start);
+
+int sport_tx_stop(struct sport_device *sport)
+{
+ if (!sport->tx_run)
+ return 0;
+ if (sport->rx_run) {
+ /* RX is still running, hook the dummy buffer */
+ sport_hook_tx_dummy(sport);
+ } else {
+ /* Both rx and tx dma stopped */
+ sport_stop(sport);
+ sport->curr_rx_desc = NULL;
+ sport->curr_tx_desc = NULL;
+ }
+
+ sport->tx_run = 0;
+
+ return 0;
+}
+EXPORT_SYMBOL(sport_tx_stop);
+
+static inline int compute_wdsize(size_t wdsize)
+{
+ switch (wdsize) {
+ case 1:
+ return WDSIZE_8;
+ case 2:
+ return WDSIZE_16;
+ case 4:
+ default:
+ return WDSIZE_32;
+ }
+}
+
+int sport_config_rx_dma(struct sport_device *sport, void *buf,
+ int fragcount, size_t fragsize)
+{
+ unsigned int x_count;
+ unsigned int y_count;
+ unsigned int cfg;
+ dma_addr_t addr;
+
+ pr_debug("%s buf:%p, frag:%d, fragsize:0x%lx\n", __func__, \
+ buf, fragcount, fragsize);
+
+ x_count = fragsize / sport->wdsize;
+ y_count = 0;
+
+ /* for fragments larger than 64k words we use 2d dma,
+ * denote fragecount as two numbers' mutliply and both of them
+ * are less than 64k.*/
+ if (x_count >= 0x10000) {
+ int i, count = x_count;
+
+ for (i = 16; i > 0; i--) {
+ x_count = 1 << i;
+ if ((count & (x_count - 1)) == 0) {
+ y_count = count >> i;
+ if (y_count < 0x10000)
+ break;
+ }
+ }
+ if (i == 0)
+ return -EINVAL;
+ }
+ pr_debug("%s(x_count:0x%x, y_count:0x%x)\n", __func__,
+ x_count, y_count);
+
+ if (sport->dma_rx_desc)
+ dma_free_coherent(NULL, sport->rx_desc_bytes,
+ sport->dma_rx_desc, 0);
+
+ /* Allocate a new descritor ring as current one. */
+ sport->dma_rx_desc = dma_alloc_coherent(NULL, \
+ fragcount * sizeof(struct dmasg), &addr, 0);
+ sport->rx_desc_bytes = fragcount * sizeof(struct dmasg);
+
+ if (!sport->dma_rx_desc) {
+ pr_err("Failed to allocate memory for rx desc\n");
+ return -ENOMEM;
+ }
+
+ sport->rx_buf = buf;
+ sport->rx_fragsize = fragsize;
+ sport->rx_frags = fragcount;
+
+ cfg = 0x7000 | DI_EN | compute_wdsize(sport->wdsize) | WNR | \
+ (DESC_ELEMENT_COUNT << 8); /* large descriptor mode */
+
+ if (y_count != 0)
+ cfg |= DMA2D;
+
+ setup_desc(sport->dma_rx_desc, buf, fragcount, fragsize,
+ cfg|DMAEN, x_count, y_count, sport->wdsize);
+
+ return 0;
+}
+EXPORT_SYMBOL(sport_config_rx_dma);
+
+int sport_config_tx_dma(struct sport_device *sport, void *buf, \
+ int fragcount, size_t fragsize)
+{
+ unsigned int x_count;
+ unsigned int y_count;
+ unsigned int cfg;
+ dma_addr_t addr;
+
+ pr_debug("%s buf:%p, fragcount:%d, fragsize:0x%lx\n",
+ __func__, buf, fragcount, fragsize);
+
+ x_count = fragsize/sport->wdsize;
+ y_count = 0;
+
+ /* for fragments larger than 64k words we use 2d dma,
+ * denote fragecount as two numbers' mutliply and both of them
+ * are less than 64k.*/
+ if (x_count >= 0x10000) {
+ int i, count = x_count;
+
+ for (i = 16; i > 0; i--) {
+ x_count = 1 << i;
+ if ((count & (x_count - 1)) == 0) {
+ y_count = count >> i;
+ if (y_count < 0x10000)
+ break;
+ }
+ }
+ if (i == 0)
+ return -EINVAL;
+ }
+ pr_debug("%s x_count:0x%x, y_count:0x%x\n", __func__,
+ x_count, y_count);
+
+
+ if (sport->dma_tx_desc) {
+ dma_free_coherent(NULL, sport->tx_desc_bytes, \
+ sport->dma_tx_desc, 0);
+ }
+
+ sport->dma_tx_desc = dma_alloc_coherent(NULL, \
+ fragcount * sizeof(struct dmasg), &addr, 0);
+ sport->tx_desc_bytes = fragcount * sizeof(struct dmasg);
+ if (!sport->dma_tx_desc) {
+ pr_err("Failed to allocate memory for tx desc\n");
+ return -ENOMEM;
+ }
+
+ sport->tx_buf = buf;
+ sport->tx_fragsize = fragsize;
+ sport->tx_frags = fragcount;
+ cfg = 0x7000 | DI_EN | compute_wdsize(sport->wdsize) | \
+ (DESC_ELEMENT_COUNT << 8); /* large descriptor mode */
+
+ if (y_count != 0)
+ cfg |= DMA2D;
+
+ setup_desc(sport->dma_tx_desc, buf, fragcount, fragsize,
+ cfg|DMAEN, x_count, y_count, sport->wdsize);
+
+ return 0;
+}
+EXPORT_SYMBOL(sport_config_tx_dma);
+
+/* setup dummy dma descriptor ring, which don't generate interrupts,
+ * the x_modify is set to 0 */
+static int sport_config_rx_dummy(struct sport_device *sport)
+{
+ struct dmasg *desc;
+ unsigned config;
+
+ pr_debug("%s entered\n", __func__);
+#if L1_DATA_A_LENGTH != 0
+ desc = (struct dmasg *) l1_data_sram_alloc(2 * sizeof(*desc));
+#else
+ {
+ dma_addr_t addr;
+ desc = dma_alloc_coherent(NULL, 2 * sizeof(*desc), &addr, 0);
+ }
+#endif
+ if (desc == NULL) {
+ pr_err("Failed to allocate memory for dummy rx desc\n");
+ return -ENOMEM;
+ }
+ memset(desc, 0, 2 * sizeof(*desc));
+ sport->dummy_rx_desc = desc;
+ desc->start_addr = (unsigned long)sport->dummy_buf;
+ config = DMAFLOW_LARGE | NDSIZE_9 | compute_wdsize(sport->wdsize)
+ | WNR | DMAEN;
+ desc->cfg = config;
+ desc->x_count = sport->dummy_count/sport->wdsize;
+ desc->x_modify = sport->wdsize;
+ desc->y_count = 0;
+ desc->y_modify = 0;
+ memcpy(desc+1, desc, sizeof(*desc));
+ desc->next_desc_addr = (unsigned long)(desc+1);
+ desc[1].next_desc_addr = (unsigned long)desc;
+ return 0;
+}
+
+static int sport_config_tx_dummy(struct sport_device *sport)
+{
+ struct dmasg *desc;
+ unsigned int config;
+
+ pr_debug("%s entered\n", __func__);
+
+#if L1_DATA_A_LENGTH != 0
+ desc = (struct dmasg *) l1_data_sram_alloc(2 * sizeof(*desc));
+#else
+ {
+ dma_addr_t addr;
+ desc = dma_alloc_coherent(NULL, 2 * sizeof(*desc), &addr, 0);
+ }
+#endif
+ if (!desc) {
+ pr_err("Failed to allocate memory for dummy tx desc\n");
+ return -ENOMEM;
+ }
+ memset(desc, 0, 2 * sizeof(*desc));
+ sport->dummy_tx_desc = desc;
+ desc->start_addr = (unsigned long)sport->dummy_buf + \
+ sport->dummy_count;
+ config = DMAFLOW_LARGE | NDSIZE_9 |
+ compute_wdsize(sport->wdsize) | DMAEN;
+ desc->cfg = config;
+ desc->x_count = sport->dummy_count/sport->wdsize;
+ desc->x_modify = sport->wdsize;
+ desc->y_count = 0;
+ desc->y_modify = 0;
+ memcpy(desc+1, desc, sizeof(*desc));
+ desc->next_desc_addr = (unsigned long)(desc+1);
+ desc[1].next_desc_addr = (unsigned long)desc;
+ return 0;
+}
+
+unsigned long sport_curr_offset_rx(struct sport_device *sport)
+{
+ unsigned long curr = get_dma_curr_addr(sport->dma_rx_chan);
+
+ return (unsigned char *)curr - sport->rx_buf;
+}
+EXPORT_SYMBOL(sport_curr_offset_rx);
+
+unsigned long sport_curr_offset_tx(struct sport_device *sport)
+{
+ unsigned long curr = get_dma_curr_addr(sport->dma_tx_chan);
+
+ return (unsigned char *)curr - sport->tx_buf;
+}
+EXPORT_SYMBOL(sport_curr_offset_tx);
+
+void sport_incfrag(struct sport_device *sport, int *frag, int tx)
+{
+ ++(*frag);
+ if (tx == 1 && *frag == sport->tx_frags)
+ *frag = 0;
+
+ if (tx == 0 && *frag == sport->rx_frags)
+ *frag = 0;
+}
+EXPORT_SYMBOL(sport_incfrag);
+
+void sport_decfrag(struct sport_device *sport, int *frag, int tx)
+{
+ --(*frag);
+ if (tx == 1 && *frag == 0)
+ *frag = sport->tx_frags;
+
+ if (tx == 0 && *frag == 0)
+ *frag = sport->rx_frags;
+}
+EXPORT_SYMBOL(sport_decfrag);
+
+static int sport_check_status(struct sport_device *sport,
+ unsigned int *sport_stat,
+ unsigned int *rx_stat,
+ unsigned int *tx_stat)
+{
+ int status = 0;
+
+ if (sport_stat) {
+ SSYNC();
+ status = sport->regs->stat;
+ if (status & (TOVF|TUVF|ROVF|RUVF))
+ sport->regs->stat = (status & (TOVF|TUVF|ROVF|RUVF));
+ SSYNC();
+ *sport_stat = status;
+ }
+
+ if (rx_stat) {
+ SSYNC();
+ status = get_dma_curr_irqstat(sport->dma_rx_chan);
+ if (status & (DMA_DONE|DMA_ERR))
+ clear_dma_irqstat(sport->dma_rx_chan);
+ SSYNC();
+ *rx_stat = status;
+ }
+
+ if (tx_stat) {
+ SSYNC();
+ status = get_dma_curr_irqstat(sport->dma_tx_chan);
+ if (status & (DMA_DONE|DMA_ERR))
+ clear_dma_irqstat(sport->dma_tx_chan);
+ SSYNC();
+ *tx_stat = status;
+ }
+
+ return 0;
+}
+
+int sport_dump_stat(struct sport_device *sport, char *buf, size_t len)
+{
+ int ret;
+
+ ret = snprintf(buf, len,
+ "sts: 0x%04x\n"
+ "rx dma %d sts: 0x%04x tx dma %d sts: 0x%04x\n",
+ sport->regs->stat,
+ sport->dma_rx_chan,
+ get_dma_curr_irqstat(sport->dma_rx_chan),
+ sport->dma_tx_chan,
+ get_dma_curr_irqstat(sport->dma_tx_chan));
+ buf += ret;
+ len -= ret;
+
+ ret += snprintf(buf, len,
+ "curr_rx_desc:0x%p, curr_tx_desc:0x%p\n"
+ "dma_rx_desc:0x%p, dma_tx_desc:0x%p\n"
+ "dummy_rx_desc:0x%p, dummy_tx_desc:0x%p\n",
+ sport->curr_rx_desc, sport->curr_tx_desc,
+ sport->dma_rx_desc, sport->dma_tx_desc,
+ sport->dummy_rx_desc, sport->dummy_tx_desc);
+
+ return ret;
+}
+
+static irqreturn_t rx_handler(int irq, void *dev_id)
+{
+ unsigned int rx_stat;
+ struct sport_device *sport = dev_id;
+
+ pr_debug("%s enter\n", __func__);
+ sport_check_status(sport, NULL, &rx_stat, NULL);
+ if (!(rx_stat & DMA_DONE))
+ pr_err("rx dma is already stopped\n");
+
+ if (sport->rx_callback) {
+ sport->rx_callback(sport->rx_data);
+ return IRQ_HANDLED;
+ }
+
+ return IRQ_NONE;
+}
+
+static irqreturn_t tx_handler(int irq, void *dev_id)
+{
+ unsigned int tx_stat;
+ struct sport_device *sport = dev_id;
+ pr_debug("%s enter\n", __func__);
+ sport_check_status(sport, NULL, NULL, &tx_stat);
+ if (!(tx_stat & DMA_DONE)) {
+ pr_err("tx dma is already stopped\n");
+ return IRQ_HANDLED;
+ }
+ if (sport->tx_callback) {
+ sport->tx_callback(sport->tx_data);
+ return IRQ_HANDLED;
+ }
+
+ return IRQ_NONE;
+}
+
+static irqreturn_t err_handler(int irq, void *dev_id)
+{
+ unsigned int status = 0;
+ struct sport_device *sport = dev_id;
+
+ pr_debug("%s\n", __func__);
+ if (sport_check_status(sport, &status, NULL, NULL)) {
+ pr_err("error checking status ??");
+ return IRQ_NONE;
+ }
+
+ if (status & (TOVF|TUVF|ROVF|RUVF)) {
+ pr_info("sport status error:%s%s%s%s\n",
+ status & TOVF ? " TOVF" : "",
+ status & TUVF ? " TUVF" : "",
+ status & ROVF ? " ROVF" : "",
+ status & RUVF ? " RUVF" : "");
+ if (status & TOVF || status & TUVF) {
+ disable_dma(sport->dma_tx_chan);
+ if (sport->tx_run)
+ sport_tx_dma_start(sport, 0);
+ else
+ sport_tx_dma_start(sport, 1);
+ enable_dma(sport->dma_tx_chan);
+ } else {
+ disable_dma(sport->dma_rx_chan);
+ if (sport->rx_run)
+ sport_rx_dma_start(sport, 0);
+ else
+ sport_rx_dma_start(sport, 1);
+ enable_dma(sport->dma_rx_chan);
+ }
+ }
+ status = sport->regs->stat;
+ if (status & (TOVF|TUVF|ROVF|RUVF))
+ sport->regs->stat = (status & (TOVF|TUVF|ROVF|RUVF));
+ SSYNC();
+
+ if (sport->err_callback)
+ sport->err_callback(sport->err_data);
+
+ return IRQ_HANDLED;
+}
+
+int sport_set_rx_callback(struct sport_device *sport,
+ void (*rx_callback)(void *), void *rx_data)
+{
+ BUG_ON(rx_callback == NULL);
+ sport->rx_callback = rx_callback;
+ sport->rx_data = rx_data;
+
+ return 0;
+}
+EXPORT_SYMBOL(sport_set_rx_callback);
+
+int sport_set_tx_callback(struct sport_device *sport,
+ void (*tx_callback)(void *), void *tx_data)
+{
+ BUG_ON(tx_callback == NULL);
+ sport->tx_callback = tx_callback;
+ sport->tx_data = tx_data;
+
+ return 0;
+}
+EXPORT_SYMBOL(sport_set_tx_callback);
+
+int sport_set_err_callback(struct sport_device *sport,
+ void (*err_callback)(void *), void *err_data)
+{
+ BUG_ON(err_callback == NULL);
+ sport->err_callback = err_callback;
+ sport->err_data = err_data;
+
+ return 0;
+}
+EXPORT_SYMBOL(sport_set_err_callback);
+
+struct sport_device *sport_init(struct sport_param *param, unsigned wdsize,
+ unsigned dummy_count, void *private_data)
+{
+ int ret;
+ struct sport_device *sport;
+ pr_debug("%s enter\n", __func__);
+ BUG_ON(param == NULL);
+ BUG_ON(wdsize == 0 || dummy_count == 0);
+ sport = kmalloc(sizeof(struct sport_device), GFP_KERNEL);
+ if (!sport) {
+ pr_err("Failed to allocate for sport device\n");
+ return NULL;
+ }
+
+ memset(sport, 0, sizeof(struct sport_device));
+ sport->dma_rx_chan = param->dma_rx_chan;
+ sport->dma_tx_chan = param->dma_tx_chan;
+ sport->err_irq = param->err_irq;
+ sport->regs = param->regs;
+ sport->private_data = private_data;
+
+ if (request_dma(sport->dma_rx_chan, "SPORT RX Data") == -EBUSY) {
+ pr_err("Failed to request RX dma %d\n", \
+ sport->dma_rx_chan);
+ goto __init_err1;
+ }
+ if (set_dma_callback(sport->dma_rx_chan, rx_handler, sport) != 0) {
+ pr_err("Failed to request RX irq %d\n", \
+ sport->dma_rx_chan);
+ goto __init_err2;
+ }
+
+ if (request_dma(sport->dma_tx_chan, "SPORT TX Data") == -EBUSY) {
+ pr_err("Failed to request TX dma %d\n", \
+ sport->dma_tx_chan);
+ goto __init_err2;
+ }
+
+ if (set_dma_callback(sport->dma_tx_chan, tx_handler, sport) != 0) {
+ pr_err("Failed to request TX irq %d\n", \
+ sport->dma_tx_chan);
+ goto __init_err3;
+ }
+
+ if (request_irq(sport->err_irq, err_handler, IRQF_SHARED, "SPORT err",
+ sport) < 0) {
+ pr_err("Failed to request err irq:%d\n", \
+ sport->err_irq);
+ goto __init_err3;
+ }
+
+ pr_err("dma rx:%d tx:%d, err irq:%d, regs:%p\n",
+ sport->dma_rx_chan, sport->dma_tx_chan,
+ sport->err_irq, sport->regs);
+
+ sport->wdsize = wdsize;
+ sport->dummy_count = dummy_count;
+
+#if L1_DATA_A_LENGTH != 0
+ sport->dummy_buf = l1_data_sram_alloc(dummy_count * 2);
+#else
+ sport->dummy_buf = kmalloc(dummy_count * 2, GFP_KERNEL);
+#endif
+ if (sport->dummy_buf == NULL) {
+ pr_err("Failed to allocate dummy buffer\n");
+ goto __error;
+ }
+
+ memset(sport->dummy_buf, 0, dummy_count * 2);
+ ret = sport_config_rx_dummy(sport);
+ if (ret) {
+ pr_err("Failed to config rx dummy ring\n");
+ goto __error;
+ }
+ ret = sport_config_tx_dummy(sport);
+ if (ret) {
+ pr_err("Failed to config tx dummy ring\n");
+ goto __error;
+ }
+
+ return sport;
+__error:
+ free_irq(sport->err_irq, sport);
+__init_err3:
+ free_dma(sport->dma_tx_chan);
+__init_err2:
+ free_dma(sport->dma_rx_chan);
+__init_err1:
+ kfree(sport);
+ return NULL;
+}
+EXPORT_SYMBOL(sport_init);
+
+void sport_done(struct sport_device *sport)
+{
+ if (sport == NULL)
+ return;
+
+ sport_stop(sport);
+ if (sport->dma_rx_desc)
+ dma_free_coherent(NULL, sport->rx_desc_bytes,
+ sport->dma_rx_desc, 0);
+ if (sport->dma_tx_desc)
+ dma_free_coherent(NULL, sport->tx_desc_bytes,
+ sport->dma_tx_desc, 0);
+
+#if L1_DATA_A_LENGTH != 0
+ l1_data_sram_free(sport->dummy_rx_desc);
+ l1_data_sram_free(sport->dummy_tx_desc);
+ l1_data_sram_free(sport->dummy_buf);
+#else
+ dma_free_coherent(NULL, 2*sizeof(struct dmasg),
+ sport->dummy_rx_desc, 0);
+ dma_free_coherent(NULL, 2*sizeof(struct dmasg),
+ sport->dummy_tx_desc, 0);
+ kfree(sport->dummy_buf);
+#endif
+ free_dma(sport->dma_rx_chan);
+ free_dma(sport->dma_tx_chan);
+ free_irq(sport->err_irq, sport);
+
+ kfree(sport);
+ sport = NULL;
+}
+EXPORT_SYMBOL(sport_done);
+/*
+* It is only used to send several bytes when dma is not enabled
+ * sport controller is configured but not enabled.
+ * Multichannel cannot works with pio mode */
+/* Used by ac97 to write and read codec register */
+int sport_send_and_recv(struct sport_device *sport, u8 *out_data, \
+ u8 *in_data, int len)
+{
+ unsigned short dma_config;
+ unsigned short status;
+ unsigned long flags;
+ unsigned long wait = 0;
+
+ pr_debug("%s enter, out_data:%p, in_data:%p len:%d\n", \
+ __func__, out_data, in_data, len);
+ pr_debug("tcr1:0x%04x, tcr2:0x%04x, tclkdiv:0x%04x, tfsdiv:0x%04x\n"
+ "mcmc1:0x%04x, mcmc2:0x%04x\n",
+ sport->regs->tcr1, sport->regs->tcr2,
+ sport->regs->tclkdiv, sport->regs->tfsdiv,
+ sport->regs->mcmc1, sport->regs->mcmc2);
+ flush_dcache_range((unsigned)out_data, (unsigned)(out_data + len));
+
+ /* Enable tx dma */
+ dma_config = (RESTART | WDSIZE_16 | DI_EN);
+ set_dma_start_addr(sport->dma_tx_chan, (unsigned long)out_data);
+ set_dma_x_count(sport->dma_tx_chan, len/2);
+ set_dma_x_modify(sport->dma_tx_chan, 2);
+ set_dma_config(sport->dma_tx_chan, dma_config);
+ enable_dma(sport->dma_tx_chan);
+
+ if (in_data != NULL) {
+ invalidate_dcache_range((unsigned)in_data, \
+ (unsigned)(in_data + len));
+ /* Enable rx dma */
+ dma_config = (RESTART | WDSIZE_16 | WNR | DI_EN);
+ set_dma_start_addr(sport->dma_rx_chan, (unsigned long)in_data);
+ set_dma_x_count(sport->dma_rx_chan, len/2);
+ set_dma_x_modify(sport->dma_rx_chan, 2);
+ set_dma_config(sport->dma_rx_chan, dma_config);
+ enable_dma(sport->dma_rx_chan);
+ }
+
+ local_irq_save(flags);
+ sport->regs->tcr1 |= TSPEN;
+ sport->regs->rcr1 |= RSPEN;
+ SSYNC();
+
+ status = get_dma_curr_irqstat(sport->dma_tx_chan);
+ while (status & DMA_RUN) {
+ udelay(1);
+ status = get_dma_curr_irqstat(sport->dma_tx_chan);
+ pr_debug("DMA status:0x%04x\n", status);
+ if (wait++ > 100)
+ goto __over;
+ }
+ status = sport->regs->stat;
+ wait = 0;
+
+ while (!(status & TXHRE)) {
+ pr_debug("sport status:0x%04x\n", status);
+ udelay(1);
+ status = *(unsigned short *)&sport->regs->stat;
+ if (wait++ > 1000)
+ goto __over;
+ }
+ /* Wait for the last byte sent out */
+ udelay(20);
+ pr_debug("sport status:0x%04x\n", status);
+
+__over:
+ sport->regs->tcr1 &= ~TSPEN;
+ sport->regs->rcr1 &= ~RSPEN;
+ SSYNC();
+ disable_dma(sport->dma_tx_chan);
+ /* Clear the status */
+ clear_dma_irqstat(sport->dma_tx_chan);
+ if (in_data != NULL) {
+ disable_dma(sport->dma_rx_chan);
+ clear_dma_irqstat(sport->dma_rx_chan);
+ }
+ SSYNC();
+ local_irq_restore(flags);
+
+ return 0;
+}
+EXPORT_SYMBOL(sport_send_and_recv);
+
+MODULE_AUTHOR("Roy Huang");
+MODULE_DESCRIPTION("SPORT driver for ADI Blackfin");
+MODULE_LICENSE("GPL");
+
projects / platform / kernel / linux-stable.git / commitdiff