sound: ASoC: Blackfin: SPORT peripheral interface driver
authorCliff Cai <cliff.cai@analog.com>
Fri, 5 Sep 2008 10:21:35 +0000 (18:21 +0800)
committerJaroslav Kysela <perex@perex.cz>
Tue, 9 Sep 2008 07:11:17 +0000 (09:11 +0200)
SPORT is a serial port which can support serveral serial communication
protocols.  It can be used as I2C/PCM/AC97. For further information,
please look up the HRM.

[Additional coding standards fixes by Mark Brown.]

Signed-off-by: Cliff Cai <cliff.cai@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
sound/soc/blackfin/bf5xx-sport.c [new file with mode: 0644]
sound/soc/blackfin/bf5xx-sport.h [new file with mode: 0644]

diff --git a/sound/soc/blackfin/bf5xx-sport.c b/sound/soc/blackfin/bf5xx-sport.c
new file mode 100644 (file)
index 0000000..3b99e48
--- /dev/null
@@ -0,0 +1,1032 @@
+/*
+ * 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");
+
diff --git a/sound/soc/blackfin/bf5xx-sport.h b/sound/soc/blackfin/bf5xx-sport.h
new file mode 100644 (file)
index 0000000..4c16345
--- /dev/null
@@ -0,0 +1,192 @@
+/*
+ * File:         bf5xx_ac97_sport.h
+ * Based on:
+ * Author:       Roy Huang <roy.huang@analog.com>
+ *
+ * Created:
+ * Description:
+ *
+ *               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
+ */
+
+
+#ifndef __BF5XX_SPORT_H__
+#define __BF5XX_SPORT_H__
+
+#include <linux/types.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+#include <asm/dma.h>
+
+struct sport_register {
+       u16 tcr1;       u16 reserved0;
+       u16 tcr2;       u16 reserved1;
+       u16 tclkdiv;    u16 reserved2;
+       u16 tfsdiv;     u16 reserved3;
+       u32 tx;
+       u32 reserved_l0;
+       u32 rx;
+       u32 reserved_l1;
+       u16 rcr1;       u16 reserved4;
+       u16 rcr2;       u16 reserved5;
+       u16 rclkdiv;    u16 reserved6;
+       u16 rfsdiv;     u16 reserved7;
+       u16 stat;       u16 reserved8;
+       u16 chnl;       u16 reserved9;
+       u16 mcmc1;      u16 reserved10;
+       u16 mcmc2;      u16 reserved11;
+       u32 mtcs0;
+       u32 mtcs1;
+       u32 mtcs2;
+       u32 mtcs3;
+       u32 mrcs0;
+       u32 mrcs1;
+       u32 mrcs2;
+       u32 mrcs3;
+};
+
+#define DESC_ELEMENT_COUNT 9
+
+struct sport_device {
+       int dma_rx_chan;
+       int dma_tx_chan;
+       int err_irq;
+       struct sport_register *regs;
+
+       unsigned char *rx_buf;
+       unsigned char *tx_buf;
+       unsigned int rx_fragsize;
+       unsigned int tx_fragsize;
+       unsigned int rx_frags;
+       unsigned int tx_frags;
+       unsigned int wdsize;
+
+       /* for dummy dma transfer */
+       void *dummy_buf;
+       unsigned int dummy_count;
+
+       /* DMA descriptor ring head of current audio stream*/
+       struct dmasg *dma_rx_desc;
+       struct dmasg *dma_tx_desc;
+       unsigned int rx_desc_bytes;
+       unsigned int tx_desc_bytes;
+
+       unsigned int rx_run:1; /* rx is running */
+       unsigned int tx_run:1; /* tx is running */
+
+       struct dmasg *dummy_rx_desc;
+       struct dmasg *dummy_tx_desc;
+
+       struct dmasg *curr_rx_desc;
+       struct dmasg *curr_tx_desc;
+
+       int rx_curr_frag;
+       int tx_curr_frag;
+
+       unsigned int rcr1;
+       unsigned int rcr2;
+       int rx_tdm_count;
+
+       unsigned int tcr1;
+       unsigned int tcr2;
+       int tx_tdm_count;
+
+       void (*rx_callback)(void *data);
+       void *rx_data;
+       void (*tx_callback)(void *data);
+       void *tx_data;
+       void (*err_callback)(void *data);
+       void *err_data;
+       unsigned char *tx_dma_buf;
+       unsigned char *rx_dma_buf;
+#ifdef CONFIG_SND_MMAP_SUPPORT
+       dma_addr_t tx_dma_phy;
+       dma_addr_t rx_dma_phy;
+       int tx_pos;/*pcm sample count*/
+       int rx_pos;
+       unsigned int tx_buffer_size;
+       unsigned int rx_buffer_size;
+#endif
+       void *private_data;
+};
+
+extern struct sport_device *sport_handle;
+
+struct sport_param {
+       int dma_rx_chan;
+       int dma_tx_chan;
+       int err_irq;
+       struct sport_register *regs;
+};
+
+struct sport_device *sport_init(struct sport_param *param, unsigned wdsize,
+               unsigned dummy_count, void *private_data);
+
+void sport_done(struct sport_device *sport);
+
+/* first use these ...*/
+
+/* note: multichannel is in units of 8 channels, tdm_count is number of channels
+ *  NOT / 8 ! all channels are enabled by default */
+int sport_set_multichannel(struct sport_device *sport, int tdm_count,
+               u32 mask, int packed);
+
+int sport_config_rx(struct sport_device *sport,
+               unsigned int rcr1, unsigned int rcr2,
+               unsigned int clkdiv, unsigned int fsdiv);
+
+int sport_config_tx(struct sport_device *sport,
+               unsigned int tcr1, unsigned int tcr2,
+               unsigned int clkdiv, unsigned int fsdiv);
+
+/* ... then these: */
+
+/* buffer size (in bytes) == fragcount * fragsize_bytes */
+
+/* this is not a very general api, it sets the dma to 2d autobuffer mode */
+
+int sport_config_rx_dma(struct sport_device *sport, void *buf,
+               int fragcount, size_t fragsize_bytes);
+
+int sport_config_tx_dma(struct sport_device *sport, void *buf,
+               int fragcount, size_t fragsize_bytes);
+
+int sport_tx_start(struct sport_device *sport);
+int sport_tx_stop(struct sport_device *sport);
+int sport_rx_start(struct sport_device *sport);
+int sport_rx_stop(struct sport_device *sport);
+
+/* for use in interrupt handler */
+unsigned long sport_curr_offset_rx(struct sport_device *sport);
+unsigned long sport_curr_offset_tx(struct sport_device *sport);
+
+void sport_incfrag(struct sport_device *sport, int *frag, int tx);
+void sport_decfrag(struct sport_device *sport, int *frag, int tx);
+
+int sport_set_rx_callback(struct sport_device *sport,
+                      void (*rx_callback)(void *), void *rx_data);
+int sport_set_tx_callback(struct sport_device *sport,
+                      void (*tx_callback)(void *), void *tx_data);
+int sport_set_err_callback(struct sport_device *sport,
+                      void (*err_callback)(void *), void *err_data);
+
+int sport_send_and_recv(struct sport_device *sport, u8 *out_data, \
+               u8 *in_data, int len);
+#endif /* BF53X_SPORT_H */