sound: ASoC: Blackfin: SPORT peripheral interface driver

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

@@ -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");
+

sound/soc/blackfin/bf5xx-sport.h

@@ -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 */