[ALSA] Emagic Audiowerk 2 ALSA driver.

Signed-off-by: Cedric Bregardis <cedric.bregardis@free.fr>
Signed-off-by: Jean-Christian Hassler <jhassler@free.fr>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 464 insertions, 0 deletions

diff --git a/sound/pci/aw2/aw2-saa7146.c b/sound/pci/aw2/aw2-saa7146.c
new file mode 100644
index 0000000..f20f213
--- /dev/null
+++ b/sound/pci/aw2/aw2-saa7146.c
@@ -0,0 +1,464 @@
+/*****************************************************************************
+ *
+ * Copyright (C) 2008 Cedric Bregardis <cedric.bregardis@free.fr> and
+ * Jean-Christian Hassler <jhassler@free.fr>
+ *
+ * This file is part of the Audiowerk2 ALSA driver
+ *
+ * The Audiowerk2 ALSA driver 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; version 2.
+ *
+ * The Audiowerk2 ALSA driver 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 the Audiowerk2 ALSA driver; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+ * USA.
+ *
+ *****************************************************************************/
+
+#define AW2_SAA7146_M
+
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+
+#include "aw2-tsl.h"
+#include "saa7146.h"
+#include "aw2-saa7146.h"
+
+#define WRITEREG(value, addr) writel((value), chip->base_addr + (addr))
+#define READREG(addr) readl(chip->base_addr + (addr))
+
+static struct snd_aw2_saa7146_cb_param
+ arr_substream_it_playback_cb[NB_STREAM_PLAYBACK];
+static struct snd_aw2_saa7146_cb_param
+ arr_substream_it_capture_cb[NB_STREAM_CAPTURE];
+
+static int snd_aw2_saa7146_get_limit(int size);
+
+/* chip-specific destructor */
+int snd_aw2_saa7146_free(struct snd_aw2_saa7146 *chip)
+{
+	/* disable all irqs */
+	WRITEREG(0, IER);
+
+	/* reset saa7146 */
+	WRITEREG((MRST_N << 16), MC1);
+
+	/* Unset base addr */
+	chip->base_addr = NULL;
+
+	return 0;
+}
+
+void snd_aw2_saa7146_setup(struct snd_aw2_saa7146 *chip,
+			   void __iomem *pci_base_addr)
+{
+	/* set PCI burst/threshold
+
+	   Burst length definition
+	   VALUE    BURST LENGTH
+	   000      1 Dword
+	   001      2 Dwords
+	   010      4 Dwords
+	   011      8 Dwords
+	   100      16 Dwords
+	   101      32 Dwords
+	   110      64 Dwords
+	   111      128 Dwords
+
+	   Threshold definition
+	   VALUE    WRITE MODE              READ MODE
+	   00       1 Dword of valid data   1 empty Dword
+	   01       4 Dwords of valid data  4 empty Dwords
+	   10       8 Dwords of valid data  8 empty Dwords
+	   11       16 Dwords of valid data 16 empty Dwords */
+
+	unsigned int acon2;
+	unsigned int acon1 = 0;
+	int i;
+
+	/* Set base addr */
+	chip->base_addr = pci_base_addr;
+
+	/* disable all irqs */
+	WRITEREG(0, IER);
+
+	/* reset saa7146 */
+	WRITEREG((MRST_N << 16), MC1);
+
+	/* enable audio interface */
+#ifdef __BIG_ENDIAN
+	acon1 |= A1_SWAP;
+	acon1 |= A2_SWAP;
+#endif
+	/* WS0_CTRL, WS0_SYNC: input TSL1, I2S */
+
+	/* At initialization WS1 and WS2 are disbaled (configured as input */
+	acon1 |= 0 * WS1_CTRL;
+	acon1 |= 0 * WS2_CTRL;
+
+	/* WS4 is not used. So it must not restart A2.
+	   This is why it is configured as output (force to low) */
+	acon1 |= 3 * WS4_CTRL;
+
+	/* WS3_CTRL, WS3_SYNC: output TSL2, I2S */
+	acon1 |= 2 * WS3_CTRL;
+
+	/* A1 and A2 are active and asynchronous */
+	acon1 |= 3 * AUDIO_MODE;
+	WRITEREG(acon1, ACON1);
+
+	/* The following comes from original windows driver.
+	   It is needed to have a correct behavior of input and output
+	   simultenously, but I don't know why ! */
+	WRITEREG(3 * (BurstA1_in) + 3 * (ThreshA1_in) +
+		 3 * (BurstA1_out) + 3 * (ThreshA1_out) +
+		 3 * (BurstA2_out) + 3 * (ThreshA2_out), PCI_BT_A);
+
+	/* enable audio port pins */
+	WRITEREG((EAP << 16) | EAP, MC1);
+
+	/* enable I2C */
+	WRITEREG((EI2C << 16) | EI2C, MC1);
+	/* enable interrupts */
+	WRITEREG(A1_out | A2_out | A1_in | IIC_S | IIC_E, IER);
+
+	/* audio configuration */
+	acon2 = A2_CLKSRC | BCLK1_OEN;
+	WRITEREG(acon2, ACON2);
+
+	/* By default use analog input */
+	snd_aw2_saa7146_use_digital_input(chip, 0);
+
+	/* TSL setup */
+	for (i = 0; i < 8; ++i) {
+		WRITEREG(tsl1[i], TSL1 + (i * 4));
+		WRITEREG(tsl2[i], TSL2 + (i * 4));
+	}
+
+}
+
+void snd_aw2_saa7146_pcm_init_playback(struct snd_aw2_saa7146 *chip,
+				       int stream_number,
+				       unsigned long dma_addr,
+				       unsigned long period_size,
+				       unsigned long buffer_size)
+{
+	unsigned long dw_page, dw_limit;
+
+	/* Configure DMA for substream
+	   Configuration informations: ALSA has allocated continuous memory
+	   pages. So we don't need to use MMU of saa7146.
+	 */
+
+	/* No MMU -> nothing to do with PageA1, we only configure the limit of
+	   PageAx_out register */
+	/* Disable MMU */
+	dw_page = (0L << 11);
+
+	/* Configure Limit for DMA access.
+	   The limit register defines an address limit, which generates
+	   an interrupt if passed by the actual PCI address pointer.
+	   '0001' means an interrupt will be generated if the lower
+	   6 bits (64 bytes) of the PCI address are zero. '0010'
+	   defines a limit of 128 bytes, '0011' one of 256 bytes, and
+	   so on up to 1 Mbyte defined by '1111'. This interrupt range
+	   can be calculated as follows:
+	   Range = 2^(5 + Limit) bytes.
+	 */
+	dw_limit = snd_aw2_saa7146_get_limit(period_size);
+	dw_page |= (dw_limit << 4);
+
+	if (stream_number == 0) {
+		WRITEREG(dw_page, PageA2_out);
+
+		/* Base address for DMA transfert. */
+		/* This address has been reserved by ALSA. */
+		/* This is a physical address */
+		WRITEREG(dma_addr, BaseA2_out);
+
+		/* Define upper limit for DMA access */
+		WRITEREG(dma_addr + buffer_size, ProtA2_out);
+
+	} else if (stream_number == 1) {
+		WRITEREG(dw_page, PageA1_out);
+
+		/* Base address for DMA transfert. */
+		/* This address has been reserved by ALSA. */
+		/* This is a physical address */
+		WRITEREG(dma_addr, BaseA1_out);
+
+		/* Define upper limit for DMA access */
+		WRITEREG(dma_addr + buffer_size, ProtA1_out);
+	} else {
+		printk(KERN_ERR
+		       "aw2: snd_aw2_saa7146_pcm_init_playback: "
+		       "Substream number is not 0 or 1 -> not managed\n");
+	}
+}
+
+void snd_aw2_saa7146_pcm_init_capture(struct snd_aw2_saa7146 *chip,
+				      int stream_number, unsigned long dma_addr,
+				      unsigned long period_size,
+				      unsigned long buffer_size)
+{
+	unsigned long dw_page, dw_limit;
+
+	/* Configure DMA for substream
+	   Configuration informations: ALSA has allocated continuous memory
+	   pages. So we don't need to use MMU of saa7146.
+	 */
+
+	/* No MMU -> nothing to do with PageA1, we only configure the limit of
+	   PageAx_out register */
+	/* Disable MMU */
+	dw_page = (0L << 11);
+
+	/* Configure Limit for DMA access.
+	   The limit register defines an address limit, which generates
+	   an interrupt if passed by the actual PCI address pointer.
+	   '0001' means an interrupt will be generated if the lower
+	   6 bits (64 bytes) of the PCI address are zero. '0010'
+	   defines a limit of 128 bytes, '0011' one of 256 bytes, and
+	   so on up to 1 Mbyte defined by '1111'. This interrupt range
+	   can be calculated as follows:
+	   Range = 2^(5 + Limit) bytes.
+	 */
+	dw_limit = snd_aw2_saa7146_get_limit(period_size);
+	dw_page |= (dw_limit << 4);
+
+	if (stream_number == 0) {
+		WRITEREG(dw_page, PageA1_in);
+
+		/* Base address for DMA transfert. */
+		/* This address has been reserved by ALSA. */
+		/* This is a physical address */
+		WRITEREG(dma_addr, BaseA1_in);
+
+		/* Define upper limit for DMA access  */
+		WRITEREG(dma_addr + buffer_size, ProtA1_in);
+	} else {
+		printk(KERN_ERR
+		       "aw2: snd_aw2_saa7146_pcm_init_capture: "
+		       "Substream number is not 0 -> not managed\n");
+	}
+}
+
+void snd_aw2_saa7146_define_it_playback_callback(unsigned int stream_number,
+						 snd_aw2_saa7146_it_cb
+						 p_it_callback,
+						 void *p_callback_param)
+{
+	if (stream_number < NB_STREAM_PLAYBACK) {
+		arr_substream_it_playback_cb[stream_number].p_it_callback =
+		    (snd_aw2_saa7146_it_cb) p_it_callback;
+		arr_substream_it_playback_cb[stream_number].p_callback_param =
+		    (void *)p_callback_param;
+	}
+}
+
+void snd_aw2_saa7146_define_it_capture_callback(unsigned int stream_number,
+						snd_aw2_saa7146_it_cb
+						p_it_callback,
+						void *p_callback_param)
+{
+	if (stream_number < NB_STREAM_CAPTURE) {
+		arr_substream_it_capture_cb[stream_number].p_it_callback =
+		    (snd_aw2_saa7146_it_cb) p_it_callback;
+		arr_substream_it_capture_cb[stream_number].p_callback_param =
+		    (void *)p_callback_param;
+	}
+}
+
+void snd_aw2_saa7146_pcm_trigger_start_playback(struct snd_aw2_saa7146 *chip,
+						int stream_number)
+{
+	unsigned int acon1 = 0;
+	/* In aw8 driver, dma transfert is always active. It is
+	   started and stopped in a larger "space" */
+	acon1 = READREG(ACON1);
+	if (stream_number == 0) {
+		WRITEREG((TR_E_A2_OUT << 16) | TR_E_A2_OUT, MC1);
+
+		/* WS2_CTRL, WS2_SYNC: output TSL2, I2S */
+		acon1 |= 2 * WS2_CTRL;
+		WRITEREG(acon1, ACON1);
+
+	} else if (stream_number == 1) {
+		WRITEREG((TR_E_A1_OUT << 16) | TR_E_A1_OUT, MC1);
+
+		/* WS1_CTRL, WS1_SYNC: output TSL1, I2S */
+		acon1 |= 1 * WS1_CTRL;
+		WRITEREG(acon1, ACON1);
+	}
+}
+
+void snd_aw2_saa7146_pcm_trigger_stop_playback(struct snd_aw2_saa7146 *chip,
+					       int stream_number)
+{
+	unsigned int acon1 = 0;
+	acon1 = READREG(ACON1);
+	if (stream_number == 0) {
+		/* WS2_CTRL, WS2_SYNC: output TSL2, I2S */
+		acon1 &= ~(3 * WS2_CTRL);
+		WRITEREG(acon1, ACON1);
+
+		WRITEREG((TR_E_A2_OUT << 16), MC1);
+	} else if (stream_number == 1) {
+		/* WS1_CTRL, WS1_SYNC: output TSL1, I2S */
+		acon1 &= ~(3 * WS1_CTRL);
+		WRITEREG(acon1, ACON1);
+
+		WRITEREG((TR_E_A1_OUT << 16), MC1);
+	}
+}
+
+void snd_aw2_saa7146_pcm_trigger_start_capture(struct snd_aw2_saa7146 *chip,
+					       int stream_number)
+{
+	/* In aw8 driver, dma transfert is always active. It is
+	   started and stopped in a larger "space" */
+	if (stream_number == 0)
+		WRITEREG((TR_E_A1_IN << 16) | TR_E_A1_IN, MC1);
+}
+
+void snd_aw2_saa7146_pcm_trigger_stop_capture(struct snd_aw2_saa7146 *chip,
+					      int stream_number)
+{
+	if (stream_number == 0)
+		WRITEREG((TR_E_A1_IN << 16), MC1);
+}
+
+irqreturn_t snd_aw2_saa7146_interrupt(int irq, void *dev_id)
+{
+	unsigned int isr;
+	unsigned int iicsta;
+	struct snd_aw2_saa7146 *chip = dev_id;
+
+	isr = READREG(ISR);
+	if (!isr)
+		return IRQ_NONE;
+
+	WRITEREG(isr, ISR);
+
+	if (isr & (IIC_S | IIC_E)) {
+		iicsta = READREG(IICSTA);
+		WRITEREG(0x100, IICSTA);
+	}
+
+	if (isr & A1_out) {
+		if (arr_substream_it_playback_cb[1].p_it_callback != NULL) {
+			arr_substream_it_playback_cb[1].
+			    p_it_callback(arr_substream_it_playback_cb[1].
+					  p_callback_param);
+		}
+	}
+	if (isr & A2_out) {
+		if (arr_substream_it_playback_cb[0].p_it_callback != NULL) {
+			arr_substream_it_playback_cb[0].
+			    p_it_callback(arr_substream_it_playback_cb[0].
+					  p_callback_param);
+		}
+
+	}
+	if (isr & A1_in) {
+		if (arr_substream_it_capture_cb[0].p_it_callback != NULL) {
+			arr_substream_it_capture_cb[0].
+			    p_it_callback(arr_substream_it_capture_cb[0].
+					  p_callback_param);
+		}
+	}
+	return IRQ_HANDLED;
+}
+
+unsigned int snd_aw2_saa7146_get_hw_ptr_playback(struct snd_aw2_saa7146 *chip,
+						 int stream_number,
+						 unsigned char *start_addr,
+						 unsigned int buffer_size)
+{
+	long pci_adp = 0;
+	size_t ptr = 0;
+
+	if (stream_number == 0) {
+		pci_adp = READREG(PCI_ADP3);
+		ptr = pci_adp - (long)start_addr;
+
+		if (ptr == buffer_size)
+			ptr = 0;
+	}
+	if (stream_number == 1) {
+		pci_adp = READREG(PCI_ADP1);
+		ptr = pci_adp - (size_t) start_addr;
+
+		if (ptr == buffer_size)
+			ptr = 0;
+	}
+	return ptr;
+}
+
+unsigned int snd_aw2_saa7146_get_hw_ptr_capture(struct snd_aw2_saa7146 *chip,
+						int stream_number,
+						unsigned char *start_addr,
+						unsigned int buffer_size)
+{
+	size_t pci_adp = 0;
+	size_t ptr = 0;
+	if (stream_number == 0) {
+		pci_adp = READREG(PCI_ADP2);
+		ptr = pci_adp - (size_t) start_addr;
+
+		if (ptr == buffer_size)
+			ptr = 0;
+	}
+	return ptr;
+}
+
+void snd_aw2_saa7146_use_digital_input(struct snd_aw2_saa7146 *chip,
+				       int use_digital)
+{
+	/* FIXME: switch between analog and digital input does not always work.
+	   It can produce a kind of white noise. It seams that received data
+	   are inverted sometime (endian inversion). Why ? I don't know, maybe
+	   a problem of synchronization... However for the time being I have
+	   not found the problem. Workaround: switch again (and again) between
+	   digital and analog input until it works. */
+	if (use_digital)
+		WRITEREG(0x40, GPIO_CTRL);
+	else
+		WRITEREG(0x50, GPIO_CTRL);
+}
+
+int snd_aw2_saa7146_is_using_digital_input(struct snd_aw2_saa7146 *chip)
+{
+	unsigned int reg_val = READREG(GPIO_CTRL);
+	if ((reg_val & 0xFF) == 0x40)
+		return 1;
+	else
+		return 0;
+}
+
+
+static int snd_aw2_saa7146_get_limit(int size)
+{
+	int limitsize = 32;
+	int limit = 0;
+	while (limitsize < size) {
+		limitsize *= 2;
+		limit++;
+	}
+	return limit;
+}