Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 3176 insertions, 0 deletions

diff --git a/sound/oss/dmasound/dmasound_awacs.c b/sound/oss/dmasound/dmasound_awacs.c
new file mode 100644
index 00000000000..5281b88987f
--- /dev/null
+++ b/sound/oss/dmasound/dmasound_awacs.c
@@ -0,0 +1,3176 @@
+/*
+ *  linux/sound/oss/dmasound/dmasound_awacs.c
+ *
+ *  PowerMac `AWACS' and `Burgundy' DMA Sound Driver
+ *  with some limited support for DACA & Tumbler
+ *
+ *  See linux/sound/oss/dmasound/dmasound_core.c for copyright and
+ *  history prior to 2001/01/26.
+ *
+ *	26/01/2001 ed 0.1 Iain Sandoe
+ *		- added version info.
+ *		- moved dbdma command buffer allocation to PMacXXXSqSetup()
+ *		- fixed up beep dbdma cmd buffers
+ *
+ *	08/02/2001 [0.2]
+ *		- make SNDCTL_DSP_GETFMTS return the correct info for the h/w
+ *		- move soft format translations to a separate file
+ *		- [0.3] make SNDCTL_DSP_GETCAPS return correct info.
+ *		- [0.4] more informative machine name strings.
+ *		- [0.5]
+ *		- record changes.
+ *		- made the default_hard/soft entries.
+ *	04/04/2001 [0.6]
+ *		- minor correction to bit assignments in awacs_defs.h
+ *		- incorporate mixer changes from 2.2.x back-port.
+ *		- take out passthru as a rec input (it isn't).
+ *              - make Input Gain slider work the 'right way up'.
+ *              - try to make the mixer sliders more logical - so now the
+ *                input selectors are just two-state (>50% == ON) and the
+ *                Input Gain slider handles the rest of the gain issues.
+ *              - try to pick slider representations that most closely match
+ *                the actual use - e.g. IGain for input gain... 
+ *              - first stab at over/under-run detection.
+ *		- minor cosmetic changes to IRQ identification.
+ *		- fix bug where rates > max would be reported as supported.
+ *              - first stab at over/under-run detection.
+ *              - make use of i2c for mixer settings conditional on perch
+ *                rather than cuda (some machines without perch have cuda).
+ *              - fix bug where TX stops when dbdma status comes up "DEAD"
+ *		  so far only reported on PowerComputing clones ... but.
+ *		- put in AWACS/Screamer register write timeouts.
+ *		- part way to partitioning the init() stuff
+ *		- first pass at 'tumbler' stuff (not support - just an attempt
+ *		  to allow the driver to load on new G4s).
+ *      01/02/2002 [0.7] - BenH
+ *	        - all sort of minor bits went in since the latest update, I
+ *	          bumped the version number for that reason
+ *
+ *      07/26/2002 [0.8] - BenH
+ *	        - More minor bits since last changelog (I should be more careful
+ *	          with those)
+ *	        - Support for snapper & better tumbler integration by Toby Sargeant
+ *	        - Headphone detect for scremer by Julien Blache
+ *	        - More tumbler fixed by Andreas Schwab
+ *	11/29/2003 [0.8.1] - Renzo Davoli (King Enzo)
+ *		- Support for Snapper line in
+ *		- snapper input resampling (for rates < 44100)
+ *		- software line gain control
+ */
+
+/* GENERAL FIXME/TODO: check that the assumptions about what is written to
+   mac-io is valid for DACA & Tumbler.
+
+   This driver is in bad need of a rewrite. The dbdma code has to be split,
+   some proper device-tree parsing code has to be written, etc...
+*/
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/soundcard.h>
+#include <linux/adb.h>
+#include <linux/nvram.h>
+#include <linux/tty.h>
+#include <linux/vt_kern.h>
+#include <linux/spinlock.h>
+#include <linux/kmod.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <asm/semaphore.h>
+#ifdef CONFIG_ADB_CUDA
+#include <linux/cuda.h>
+#endif
+#ifdef CONFIG_ADB_PMU
+#include <linux/pmu.h>
+#endif
+
+#include <linux/i2c-dev.h>
+
+#include <asm/uaccess.h>
+#include <asm/prom.h>
+#include <asm/machdep.h>
+#include <asm/io.h>
+#include <asm/dbdma.h>
+#include <asm/pmac_feature.h>
+#include <asm/irq.h>
+#include <asm/nvram.h>
+
+#include "awacs_defs.h"
+#include "dmasound.h"
+#include "tas3001c.h"
+#include "tas3004.h"
+#include "tas_common.h"
+
+#define DMASOUND_AWACS_REVISION	0
+#define DMASOUND_AWACS_EDITION	7
+
+#define AWACS_SNAPPER   110	/* fake revision # for snapper */
+#define AWACS_BURGUNDY	100	/* fake revision # for burgundy */
+#define AWACS_TUMBLER    90	/* fake revision # for tumbler */
+#define AWACS_DACA	 80	/* fake revision # for daca (ibook) */
+#define AWACS_AWACS       2     /* holding revision for AWACS */
+#define AWACS_SCREAMER    3     /* holding revision for Screamer */
+/*
+ * Interrupt numbers and addresses, & info obtained from the device tree.
+ */
+static int awacs_irq, awacs_tx_irq, awacs_rx_irq;
+static volatile struct awacs_regs __iomem *awacs;
+static volatile u32 __iomem *i2s;
+static volatile struct dbdma_regs __iomem *awacs_txdma, *awacs_rxdma;
+static int awacs_rate_index;
+static int awacs_subframe;
+static struct device_node* awacs_node;
+static struct device_node* i2s_node;
+
+static char awacs_name[64];
+static int awacs_revision;
+static int awacs_sleeping;
+static DECLARE_MUTEX(dmasound_sem);
+
+static int sound_device_id;		/* exists after iMac revA */
+static int hw_can_byteswap = 1 ;	/* most pmac sound h/w can */
+
+/* model info */
+/* To be replaced with better interaction with pmac_feature.c */
+static int is_pbook_3X00;
+static int is_pbook_g3;
+
+/* expansion info */
+static int has_perch;
+static int has_ziva;
+
+/* for earlier powerbooks which need fiddling with mac-io to enable
+ * cd etc.
+*/
+static unsigned char __iomem *latch_base;
+static unsigned char __iomem *macio_base;
+
+/*
+ * Space for the DBDMA command blocks.
+ */
+static void *awacs_tx_cmd_space;
+static volatile struct dbdma_cmd *awacs_tx_cmds;
+static int number_of_tx_cmd_buffers;
+
+static void *awacs_rx_cmd_space;
+static volatile struct dbdma_cmd *awacs_rx_cmds;
+static int number_of_rx_cmd_buffers;
+
+/*
+ * Cached values of AWACS registers (we can't read them).
+ * Except on the burgundy (and screamer). XXX
+ */
+
+int awacs_reg[8];
+int awacs_reg1_save;
+
+/* tracking values for the mixer contents
+*/
+
+static int spk_vol;
+static int line_vol;
+static int passthru_vol;
+
+static int ip_gain;           /* mic preamp settings */
+static int rec_lev = 0x4545 ; /* default CD gain 69 % */
+static int mic_lev;
+static int cd_lev = 0x6363 ; /* 99 % */
+static int line_lev;
+
+static int hdp_connected;
+
+/*
+ * Stuff for outputting a beep.  The values range from -327 to +327
+ * so we can multiply by an amplitude in the range 0..100 to get a
+ * signed short value to put in the output buffer.
+ */
+static short beep_wform[256] = {
+	0,	40,	79,	117,	153,	187,	218,	245,
+	269,	288,	304,	316,	323,	327,	327,	324,
+	318,	310,	299,	288,	275,	262,	249,	236,
+	224,	213,	204,	196,	190,	186,	183,	182,
+	182,	183,	186,	189,	192,	196,	200,	203,
+	206,	208,	209,	209,	209,	207,	204,	201,
+	197,	193,	188,	183,	179,	174,	170,	166,
+	163,	161,	160,	159,	159,	160,	161,	162,
+	164,	166,	168,	169,	171,	171,	171,	170,
+	169,	167,	163,	159,	155,	150,	144,	139,
+	133,	128,	122,	117,	113,	110,	107,	105,
+	103,	103,	103,	103,	104,	104,	105,	105,
+	105,	103,	101,	97,	92,	86,	78,	68,
+	58,	45,	32,	18,	3,	-11,	-26,	-41,
+	-55,	-68,	-79,	-88,	-95,	-100,	-102,	-102,
+	-99,	-93,	-85,	-75,	-62,	-48,	-33,	-16,
+	0,	16,	33,	48,	62,	75,	85,	93,
+	99,	102,	102,	100,	95,	88,	79,	68,
+	55,	41,	26,	11,	-3,	-18,	-32,	-45,
+	-58,	-68,	-78,	-86,	-92,	-97,	-101,	-103,
+	-105,	-105,	-105,	-104,	-104,	-103,	-103,	-103,
+	-103,	-105,	-107,	-110,	-113,	-117,	-122,	-128,
+	-133,	-139,	-144,	-150,	-155,	-159,	-163,	-167,
+	-169,	-170,	-171,	-171,	-171,	-169,	-168,	-166,
+	-164,	-162,	-161,	-160,	-159,	-159,	-160,	-161,
+	-163,	-166,	-170,	-174,	-179,	-183,	-188,	-193,
+	-197,	-201,	-204,	-207,	-209,	-209,	-209,	-208,
+	-206,	-203,	-200,	-196,	-192,	-189,	-186,	-183,
+	-182,	-182,	-183,	-186,	-190,	-196,	-204,	-213,
+	-224,	-236,	-249,	-262,	-275,	-288,	-299,	-310,
+	-318,	-324,	-327,	-327,	-323,	-316,	-304,	-288,
+	-269,	-245,	-218,	-187,	-153,	-117,	-79,	-40,
+};
+
+/* beep support */
+#define BEEP_SRATE	22050	/* 22050 Hz sample rate */
+#define BEEP_BUFLEN	512
+#define BEEP_VOLUME	15	/* 0 - 100 */
+
+static int beep_vol = BEEP_VOLUME;
+static int beep_playing;
+static int awacs_beep_state;
+static short *beep_buf;
+static void *beep_dbdma_cmd_space;
+static volatile struct dbdma_cmd *beep_dbdma_cmd;
+
+/* Burgundy functions */
+static void awacs_burgundy_wcw(unsigned addr,unsigned newval);
+static unsigned awacs_burgundy_rcw(unsigned addr);
+static void awacs_burgundy_write_volume(unsigned address, int volume);
+static int awacs_burgundy_read_volume(unsigned address);
+static void awacs_burgundy_write_mvolume(unsigned address, int volume);
+static int awacs_burgundy_read_mvolume(unsigned address);
+
+/* we will allocate a single 'emergency' dbdma cmd block to use if the
+   tx status comes up "DEAD".  This happens on some PowerComputing Pmac
+   clones, either owing to a bug in dbdma or some interaction between
+   IDE and sound.  However, this measure would deal with DEAD status if
+   if appeared elsewhere.
+
+   for the sake of memory efficiency we'll allocate this cmd as part of
+   the beep cmd stuff.
+*/
+
+static volatile struct dbdma_cmd *emergency_dbdma_cmd;
+
+#ifdef CONFIG_PMAC_PBOOK
+/*
+ * Stuff for restoring after a sleep.
+ */
+static int awacs_sleep_notify(struct pmu_sleep_notifier *self, int when);
+struct pmu_sleep_notifier awacs_sleep_notifier = {
+	awacs_sleep_notify, SLEEP_LEVEL_SOUND,
+};
+#endif /* CONFIG_PMAC_PBOOK */
+
+/* for (soft) sample rate translations */
+int expand_bal;		/* Balance factor for expanding (not volume!) */
+int expand_read_bal;	/* Balance factor for expanding reads (not volume!) */
+
+/*** Low level stuff *********************************************************/
+
+static void *PMacAlloc(unsigned int size, int flags);
+static void PMacFree(void *ptr, unsigned int size);
+static int PMacIrqInit(void);
+#ifdef MODULE
+static void PMacIrqCleanup(void);
+#endif
+static void PMacSilence(void);
+static void PMacInit(void);
+static int PMacSetFormat(int format);
+static int PMacSetVolume(int volume);
+static void PMacPlay(void);
+static void PMacRecord(void);
+static irqreturn_t pmac_awacs_tx_intr(int irq, void *devid, struct pt_regs *regs);
+static irqreturn_t pmac_awacs_rx_intr(int irq, void *devid, struct pt_regs *regs);
+static irqreturn_t pmac_awacs_intr(int irq, void *devid, struct pt_regs *regs);
+static void awacs_write(int val);
+static int awacs_get_volume(int reg, int lshift);
+static int awacs_volume_setter(int volume, int n, int mute, int lshift);
+
+
+/*** Mid level stuff **********************************************************/
+
+static int PMacMixerIoctl(u_int cmd, u_long arg);
+static int PMacWriteSqSetup(void);
+static int PMacReadSqSetup(void);
+static void PMacAbortRead(void);
+
+extern TRANS transAwacsNormal ;
+extern TRANS transAwacsExpand ;
+extern TRANS transAwacsNormalRead ;
+extern TRANS transAwacsExpandRead ;
+
+extern int daca_init(void);
+extern void daca_cleanup(void);
+extern int daca_set_volume(uint left_vol, uint right_vol);
+extern void daca_get_volume(uint * left_vol, uint  *right_vol);
+extern int daca_enter_sleep(void);
+extern int daca_leave_sleep(void);
+
+#define TRY_LOCK()	\
+	if ((rc = down_interruptible(&dmasound_sem)) != 0)	\
+		return rc;
+#define LOCK()		down(&dmasound_sem);
+
+#define UNLOCK()	up(&dmasound_sem);
+
+/* We use different versions that the ones provided in dmasound.h
+ * 
+ * FIXME: Use different names ;)
+ */
+#undef IOCTL_IN
+#undef IOCTL_OUT
+
+#define IOCTL_IN(arg, ret)	\
+	rc = get_user(ret, (int __user *)(arg)); \
+	if (rc) break;
+#define IOCTL_OUT(arg, ret)	\
+	ioctl_return2((int __user *)(arg), ret)
+
+static inline int ioctl_return2(int __user *addr, int value)
+{
+	return value < 0 ? value : put_user(value, addr);
+}
+
+
+/*** AE - TUMBLER / SNAPPER START ************************************************/
+
+
+int gpio_audio_reset, gpio_audio_reset_pol;
+int gpio_amp_mute, gpio_amp_mute_pol;
+int gpio_headphone_mute, gpio_headphone_mute_pol;
+int gpio_headphone_detect, gpio_headphone_detect_pol;
+int gpio_headphone_irq;
+
+int
+setup_audio_gpio(const char *name, const char* compatible, int *gpio_addr, int* gpio_pol)
+{
+	struct device_node *np;
+	u32* pp;
+	
+	np = find_devices("gpio");
+	if (!np)
+		return -ENODEV;
+
+	np = np->child;
+	while(np != 0) {
+		if (name) {
+			char *property = get_property(np,"audio-gpio",NULL);
+			if (property != 0 && strcmp(property,name) == 0)
+				break;
+		} else if (compatible && device_is_compatible(np, compatible))
+			break;
+		np = np->sibling;
+	}
+	if (!np)
+		return -ENODEV;
+	pp = (u32 *)get_property(np, "AAPL,address", NULL);
+	if (!pp)
+		return -ENODEV;
+	*gpio_addr = (*pp) & 0x0000ffff;
+	pp = (u32 *)get_property(np, "audio-gpio-active-state", NULL);
+	if (pp)
+		*gpio_pol = *pp;
+	else
+		*gpio_pol = 1;
+	if (np->n_intrs > 0)
+		return np->intrs[0].line;
+	
+	return 0;
+}
+
+static inline void
+write_audio_gpio(int gpio_addr, int data)
+{
+	if (!gpio_addr)
+		return;
+	pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, gpio_addr, data ? 0x05 : 0x04);
+}
+
+static inline int
+read_audio_gpio(int gpio_addr)
+{
+	if (!gpio_addr)
+		return 0;
+	return ((pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio_addr, 0) & 0x02) !=0);
+}
+
+/*
+ * Headphone interrupt via GPIO (Tumbler, Snapper, DACA)
+ */
+static irqreturn_t
+headphone_intr(int irq, void *devid, struct pt_regs *regs)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&dmasound.lock, flags);
+	if (read_audio_gpio(gpio_headphone_detect) == gpio_headphone_detect_pol) {
+		printk(KERN_INFO "Audio jack plugged, muting speakers.\n");
+		write_audio_gpio(gpio_headphone_mute, !gpio_headphone_mute_pol);
+		write_audio_gpio(gpio_amp_mute, gpio_amp_mute_pol);
+		tas_output_device_change(sound_device_id,TAS_OUTPUT_HEADPHONES,0);
+	} else {
+		printk(KERN_INFO "Audio jack unplugged, enabling speakers.\n");
+		write_audio_gpio(gpio_amp_mute, !gpio_amp_mute_pol);
+		write_audio_gpio(gpio_headphone_mute, gpio_headphone_mute_pol);
+		tas_output_device_change(sound_device_id,TAS_OUTPUT_INTERNAL_SPKR,0);
+	}
+	spin_unlock_irqrestore(&dmasound.lock, flags);
+	return IRQ_HANDLED;
+}
+
+
+/* Initialize tumbler */
+
+static int
+tas_dmasound_init(void)
+{
+	setup_audio_gpio(
+		"audio-hw-reset",
+		NULL,
+		&gpio_audio_reset,
+		&gpio_audio_reset_pol);
+	setup_audio_gpio(
+		"amp-mute",
+		NULL,
+		&gpio_amp_mute,
+		&gpio_amp_mute_pol);
+	setup_audio_gpio("headphone-mute",
+		NULL,
+		&gpio_headphone_mute,
+		&gpio_headphone_mute_pol);
+	gpio_headphone_irq = setup_audio_gpio(
+		"headphone-detect",
+		NULL,
+		&gpio_headphone_detect,
+		&gpio_headphone_detect_pol);
+	/* Fix some broken OF entries in desktop machines */
+	if (!gpio_headphone_irq)
+		gpio_headphone_irq = setup_audio_gpio(
+			NULL,
+			"keywest-gpio15",
+			&gpio_headphone_detect,
+			&gpio_headphone_detect_pol);
+
+	write_audio_gpio(gpio_audio_reset, gpio_audio_reset_pol);
+	msleep(100);
+	write_audio_gpio(gpio_audio_reset, !gpio_audio_reset_pol);
+	msleep(100);
+  	if (gpio_headphone_irq) {
+		if (request_irq(gpio_headphone_irq,headphone_intr,0,"Headphone detect",NULL) < 0) {
+    			printk(KERN_ERR "tumbler: Can't request headphone interrupt\n");
+    			gpio_headphone_irq = 0;
+    		} else {
+			u8 val;
+			/* Activate headphone status interrupts */
+			val = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio_headphone_detect, 0);
+			pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, gpio_headphone_detect, val | 0x80);
+			/* Trigger it */
+  			headphone_intr(0,NULL,NULL);
+  		}
+  	}
+  	if (!gpio_headphone_irq) {
+  		/* Some machine enter this case ? */
+  		printk(KERN_WARNING "tumbler: Headphone detect IRQ not found, enabling all outputs !\n");
+  		write_audio_gpio(gpio_amp_mute, !gpio_amp_mute_pol);
+  		write_audio_gpio(gpio_headphone_mute, !gpio_headphone_mute_pol);
+  	}
+	return 0;
+}
+
+
+static int
+tas_dmasound_cleanup(void)
+{
+	if (gpio_headphone_irq)
+		free_irq(gpio_headphone_irq, NULL);
+	return 0;
+}
+
+/* We don't support 48k yet */
+static int tas_freqs[1] = { 44100 } ;
+static int tas_freqs_ok[1] = { 1 } ;
+
+/* don't know what to do really - just have to leave it where
+ * OF left things
+*/
+
+static int
+tas_set_frame_rate(void)
+{
+	if (i2s) {
+		out_le32(i2s + (I2S_REG_SERIAL_FORMAT >> 2), 0x41190000);
+		out_le32(i2s + (I2S_REG_DATAWORD_SIZES >> 2), 0x02000200);
+	}
+	dmasound.hard.speed = 44100 ;
+	awacs_rate_index = 0 ;
+	return 44100 ;
+}
+
+static int
+tas_mixer_ioctl(u_int cmd, u_long arg)
+{
+	int __user *argp = (int __user *)arg;
+	int data;
+	int rc;
+
+        rc=tas_device_ioctl(cmd, arg);
+        if (rc != -EINVAL) {
+        	return rc;
+        }
+
+        if ((cmd & ~0xff) == MIXER_WRITE(0) &&
+            tas_supported_mixers() & (1<<(cmd & 0xff))) {
+		rc = get_user(data, argp);
+                if (rc<0) return rc;
+		tas_set_mixer_level(cmd & 0xff, data);
+		tas_get_mixer_level(cmd & 0xff, &data);
+		return ioctl_return2(argp, data);
+        }
+        if ((cmd & ~0xff) == MIXER_READ(0) &&
+            tas_supported_mixers() & (1<<(cmd & 0xff))) {
+		tas_get_mixer_level(cmd & 0xff, &data);
+		return ioctl_return2(argp, data);
+        }
+
+	switch(cmd) {
+	case SOUND_MIXER_READ_DEVMASK:
+		data = tas_supported_mixers() | SOUND_MASK_SPEAKER;
+		rc = IOCTL_OUT(arg, data);
+		break;
+	case SOUND_MIXER_READ_STEREODEVS:
+		data = tas_stereo_mixers();
+		rc = IOCTL_OUT(arg, data);
+		break;
+	case SOUND_MIXER_READ_CAPS:
+		rc = IOCTL_OUT(arg, 0);
+		break;
+	case SOUND_MIXER_READ_RECMASK:
+		// XXX FIXME: find a way to check what is really available */
+		data = SOUND_MASK_LINE | SOUND_MASK_MIC;
+		rc = IOCTL_OUT(arg, data);
+		break;
+	case SOUND_MIXER_READ_RECSRC:
+		if (awacs_reg[0] & MASK_MUX_AUDIN)
+			data |= SOUND_MASK_LINE;
+		if (awacs_reg[0] & MASK_MUX_MIC)
+			data |= SOUND_MASK_MIC;
+		rc = IOCTL_OUT(arg, data);
+		break;
+	case SOUND_MIXER_WRITE_RECSRC:
+ 		IOCTL_IN(arg, data);
+		data =0;
+ 		rc = IOCTL_OUT(arg, data);
+ 		break;
+	case SOUND_MIXER_WRITE_SPEAKER:	/* really bell volume */
+ 		IOCTL_IN(arg, data);
+ 		beep_vol = data & 0xff;
+ 		/* fall through */
+	case SOUND_MIXER_READ_SPEAKER:
+		rc = IOCTL_OUT(arg, (beep_vol<<8) | beep_vol);
+ 		break;
+	case SOUND_MIXER_OUTMASK:
+	case SOUND_MIXER_OUTSRC:
+	default:
+		rc = -EINVAL;
+	}
+
+	return rc;
+}
+
+static void __init
+tas_init_frame_rates(unsigned int *prop, unsigned int l)
+{
+	int i ;
+	if (prop) {
+		for (i=0; i<1; i++)
+			tas_freqs_ok[i] = 0;
+		for (l /= sizeof(int); l > 0; --l) {
+			unsigned int r = *prop++;
+			/* Apple 'Fixed' format */
+			if (r >= 0x10000)
+				r >>= 16;
+			for (i = 0; i < 1; ++i) {
+				if (r == tas_freqs[i]) {
+					tas_freqs_ok[i] = 1;
+					break;
+				}
+			}
+		}
+	}
+	/* else we assume that all the rates are available */
+}
+
+
+/*** AE - TUMBLER / SNAPPER END ************************************************/
+
+
+
+/*** Low level stuff *********************************************************/
+
+/*
+ * PCI PowerMac, with AWACS, Screamer, Burgundy, DACA or Tumbler and DBDMA.
+ */
+static void *PMacAlloc(unsigned int size, int flags)
+{
+	return kmalloc(size, flags);
+}
+
+static void PMacFree(void *ptr, unsigned int size)
+{
+	kfree(ptr);
+}
+
+static int __init PMacIrqInit(void)
+{
+	if (awacs)
+		if (request_irq(awacs_irq, pmac_awacs_intr, 0, "Built-in Sound misc", NULL))
+			return 0;
+	if (request_irq(awacs_tx_irq, pmac_awacs_tx_intr, 0, "Built-in Sound out", NULL)
+	    || request_irq(awacs_rx_irq, pmac_awacs_rx_intr, 0, "Built-in Sound in", NULL))
+		return 0;
+	return 1;
+}
+
+#ifdef MODULE
+static void PMacIrqCleanup(void)
+{
+	/* turn off input & output dma */
+	DBDMA_DO_STOP(awacs_txdma);
+	DBDMA_DO_STOP(awacs_rxdma);
+
+	if (awacs)
+		/* disable interrupts from awacs interface */
+		out_le32(&awacs->control, in_le32(&awacs->control) & 0xfff);
+	
+	/* Switch off the sound clock */
+	pmac_call_feature(PMAC_FTR_SOUND_CHIP_ENABLE, awacs_node, 0, 0);
+	/* Make sure proper bits are set on pismo & tipb */
+	if ((machine_is_compatible("PowerBook3,1") ||
+	    machine_is_compatible("PowerBook3,2")) && awacs) {
+		awacs_reg[1] |= MASK_PAROUT0 | MASK_PAROUT1;
+		awacs_write(MASK_ADDR1 | awacs_reg[1]);
+		msleep(200);
+	}
+	if (awacs)
+		free_irq(awacs_irq, NULL);
+	free_irq(awacs_tx_irq, NULL);
+	free_irq(awacs_rx_irq, NULL);
+	
+	if (awacs)
+		iounmap(awacs);
+	if (i2s)
+		iounmap(i2s);
+	iounmap(awacs_txdma);
+	iounmap(awacs_rxdma);
+
+	release_OF_resource(awacs_node, 0);
+	release_OF_resource(awacs_node, 1);
+	release_OF_resource(awacs_node, 2);
+
+	if (awacs_tx_cmd_space)
+		kfree(awacs_tx_cmd_space);
+	if (awacs_rx_cmd_space)
+		kfree(awacs_rx_cmd_space);
+	if (beep_dbdma_cmd_space)
+		kfree(beep_dbdma_cmd_space);
+	if (beep_buf)
+		kfree(beep_buf);
+#ifdef CONFIG_PMAC_PBOOK
+	pmu_unregister_sleep_notifier(&awacs_sleep_notifier);
+#endif
+}
+#endif /* MODULE */
+
+static void PMacSilence(void)
+{
+	/* turn off output dma */
+	DBDMA_DO_STOP(awacs_txdma);
+}
+
+/* don't know what to do really - just have to leave it where
+ * OF left things
+*/
+
+static int daca_set_frame_rate(void)
+{
+	if (i2s) {
+		out_le32(i2s + (I2S_REG_SERIAL_FORMAT >> 2), 0x41190000);
+		out_le32(i2s + (I2S_REG_DATAWORD_SIZES >> 2), 0x02000200);
+	}
+	dmasound.hard.speed = 44100 ;
+	awacs_rate_index = 0 ;
+	return 44100 ;
+}
+
+static int awacs_freqs[8] = {
+	44100, 29400, 22050, 17640, 14700, 11025, 8820, 7350
+};
+static int awacs_freqs_ok[8] = { 1, 1, 1, 1, 1, 1, 1, 1 };
+
+static int
+awacs_set_frame_rate(int desired, int catch_r)
+{
+	int tolerance, i = 8 ;
+	/*
+	 * If we have a sample rate which is within catchRadius percent
+	 * of the requested value, we don't have to expand the samples.
+	 * Otherwise choose the next higher rate.
+	 * N.B.: burgundy awacs only works at 44100 Hz.
+	 */
+	do {
+		tolerance = catch_r * awacs_freqs[--i] / 100;
+		if (awacs_freqs_ok[i]
+		    && dmasound.soft.speed <= awacs_freqs[i] + tolerance)
+			break;
+	} while (i > 0);
+	dmasound.hard.speed = awacs_freqs[i];
+	awacs_rate_index = i;
+
+	out_le32(&awacs->control, MASK_IEPC | (i << 8) | 0x11 );
+	awacs_reg[1] = (awacs_reg[1] & ~MASK_SAMPLERATE) | (i << 3);
+	awacs_write(awacs_reg[1] | MASK_ADDR1);
+	return dmasound.hard.speed;
+}
+
+static int
+burgundy_set_frame_rate(void)
+{
+	awacs_rate_index = 0 ;
+	awacs_reg[1] = (awacs_reg[1] & ~MASK_SAMPLERATE) ;
+	/* XXX disable error interrupt on burgundy for now */
+	out_le32(&awacs->control, MASK_IEPC | 0 | 0x11 | MASK_IEE);
+	return 44100 ;
+}
+
+static int
+set_frame_rate(int desired, int catch_r)
+{
+	switch (awacs_revision) {
+		case AWACS_BURGUNDY:
+			dmasound.hard.speed = burgundy_set_frame_rate();
+			break ;
+		case AWACS_TUMBLER:
+		case AWACS_SNAPPER:
+			dmasound.hard.speed = tas_set_frame_rate();
+			break ;
+		case AWACS_DACA:
+			dmasound.hard.speed =
+			  daca_set_frame_rate();
+			break ;
+		default:
+			dmasound.hard.speed = awacs_set_frame_rate(desired,
+						catch_r);
+			break ;
+	}
+	return dmasound.hard.speed ;
+}
+
+static void
+awacs_recalibrate(void)
+{
+	/* Sorry for the horrible delays... I hope to get that improved
+	 * by making the whole PM process asynchronous in a future version
+	 */
+	msleep(750);
+	awacs_reg[1] |= MASK_CMUTE | MASK_AMUTE;
+	awacs_write(awacs_reg[1] | MASK_RECALIBRATE | MASK_ADDR1);
+	msleep(1000);
+	awacs_write(awacs_reg[1] | MASK_ADDR1);
+}
+
+static void PMacInit(void)
+{
+	int tolerance;
+
+	switch (dmasound.soft.format) {
+	    case AFMT_S16_LE:
+	    case AFMT_U16_LE:
+		if (hw_can_byteswap)
+			dmasound.hard.format = AFMT_S16_LE;
+		else
+			dmasound.hard.format = AFMT_S16_BE;
+		break;
+	default:
+		dmasound.hard.format = AFMT_S16_BE;
+		break;
+	}
+	dmasound.hard.stereo = 1;
+	dmasound.hard.size = 16;
+
+	/* set dmasound.hard.speed - on the basis of what we want (soft)
+	 * and the tolerance we'll allow.
+	*/
+	set_frame_rate(dmasound.soft.speed, catchRadius) ;
+
+	tolerance = (catchRadius * dmasound.hard.speed) / 100;
+	if (dmasound.soft.speed >= dmasound.hard.speed - tolerance) {
+		dmasound.trans_write = &transAwacsNormal;
+		dmasound.trans_read = &transAwacsNormalRead;
+	} else {
+		dmasound.trans_write = &transAwacsExpand;
+		dmasound.trans_read = &transAwacsExpandRead;
+	}
+
+	if (awacs) {
+		if (hw_can_byteswap && (dmasound.hard.format == AFMT_S16_LE))
+			out_le32(&awacs->byteswap, BS_VAL);
+		else
+			out_le32(&awacs->byteswap, 0);
+	}
+	
+	expand_bal = -dmasound.soft.speed;
+	expand_read_bal = -dmasound.soft.speed;
+}
+
+static int PMacSetFormat(int format)
+{
+	int size;
+	int req_format = format;
+		
+	switch (format) {
+	case AFMT_QUERY:
+		return dmasound.soft.format;
+	case AFMT_MU_LAW:
+	case AFMT_A_LAW:
+	case AFMT_U8:
+	case AFMT_S8:
+		size = 8;
+		break;
+	case AFMT_S16_LE:
+		if(!hw_can_byteswap)
+			format = AFMT_S16_BE;
+	case AFMT_S16_BE:
+		size = 16;
+		break;
+	case AFMT_U16_LE:
+		if(!hw_can_byteswap)
+			format = AFMT_U16_BE;
+	case AFMT_U16_BE:
+		size = 16;
+		break;
+	default: /* :-) */
+		printk(KERN_ERR "dmasound: unknown format 0x%x, using AFMT_U8\n",
+		       format);
+		size = 8;
+		format = AFMT_U8;
+	}
+	
+	if (req_format == format) {
+		dmasound.soft.format = format;
+		dmasound.soft.size = size;
+		if (dmasound.minDev == SND_DEV_DSP) {
+			dmasound.dsp.format = format;
+			dmasound.dsp.size = size;
+		}
+	}
+
+	return format;
+}
+
+#define AWACS_VOLUME_TO_MASK(x)	(15 - ((((x) - 1) * 15) / 99))
+#define AWACS_MASK_TO_VOLUME(y)	(100 - ((y) * 99 / 15))
+
+static int awacs_get_volume(int reg, int lshift)
+{
+	int volume;
+
+	volume = AWACS_MASK_TO_VOLUME((reg >> lshift) & 0xf);
+	volume |= AWACS_MASK_TO_VOLUME(reg & 0xf) << 8;
+	return volume;
+}
+
+static int awacs_volume_setter(int volume, int n, int mute, int lshift)
+{
+	int r1, rn;
+
+	if (mute && volume == 0) {
+		r1 = awacs_reg[1] | mute;
+	} else {
+		r1 = awacs_reg[1] & ~mute;
+		rn = awacs_reg[n] & ~(0xf | (0xf << lshift));
+		rn |= ((AWACS_VOLUME_TO_MASK(volume & 0xff) & 0xf) << lshift);
+		rn |= AWACS_VOLUME_TO_MASK((volume >> 8) & 0xff) & 0xf;
+		awacs_reg[n] = rn;
+		awacs_write((n << 12) | rn);
+		volume = awacs_get_volume(rn, lshift);
+	}
+	if (r1 != awacs_reg[1]) {
+		awacs_reg[1] = r1;
+		awacs_write(r1 | MASK_ADDR1);
+	}
+	return volume;
+}
+
+static int PMacSetVolume(int volume)
+{
+	printk(KERN_WARNING "Bogus call to PMacSetVolume !\n");
+	return 0;
+}
+
+static void awacs_setup_for_beep(int speed)
+{
+	out_le32(&awacs->control,
+		 (in_le32(&awacs->control) & ~0x1f00)
+		 | ((speed > 0 ? speed : awacs_rate_index) << 8));
+
+	if (hw_can_byteswap && (dmasound.hard.format == AFMT_S16_LE) && speed == -1)
+		out_le32(&awacs->byteswap, BS_VAL);
+	else
+		out_le32(&awacs->byteswap, 0);
+}
+
+/* CHECK: how much of this *really* needs IRQs masked? */
+static void __PMacPlay(void)
+{
+	volatile struct dbdma_cmd *cp;
+	int next_frg, count;
+
+	count = 300 ; /* > two cycles at the lowest sample rate */
+
+	/* what we want to send next */
+	next_frg = (write_sq.front + write_sq.active) % write_sq.max_count;
+
+	if (awacs_beep_state) {
+		/* sound takes precedence over beeps */
+		/* stop the dma channel */
+		out_le32(&awacs_txdma->control, (RUN|PAUSE|FLUSH|WAKE) << 16);
+		while ( (in_le32(&awacs_txdma->status) & RUN) && count--)
+			udelay(1);
+		if (awacs)
+			awacs_setup_for_beep(-1);
+		out_le32(&awacs_txdma->cmdptr,
+			 virt_to_bus(&(awacs_tx_cmds[next_frg])));
+
+		beep_playing = 0;
+		awacs_beep_state = 0;
+	}
+	/* this won't allow more than two frags to be in the output queue at
+	   once. (or one, if the max frags is 2 - because count can't exceed
+	   2 in that case)
+	*/
+	while (write_sq.active < 2 && write_sq.active < write_sq.count) {
+		count = (write_sq.count == write_sq.active + 1) ?
+				write_sq.rear_size:write_sq.block_size ;
+		if (count < write_sq.block_size) {
+			if (!write_sq.syncing) /* last block not yet filled,*/
+				break; 	/* and we're not syncing or POST-ed */
+			else {
+				/* pretend the block is full to force a new
+				   block to be started on the next write */
+				write_sq.rear_size = write_sq.block_size ;
+				write_sq.syncing &= ~2 ; /* clear POST */
+			}
+		}
+		cp = &awacs_tx_cmds[next_frg];
+		st_le16(&cp->req_count, count);
+		st_le16(&cp->xfer_status, 0);
+		st_le16(&cp->command, OUTPUT_MORE + INTR_ALWAYS);
+		/* put a STOP at the end of the queue - but only if we have
+		   space for it.  This means that, if we under-run and we only
+		   have two fragments, we might re-play sound from an existing
+		   queued frag.  I guess the solution to that is not to set two
+		   frags if you are likely to under-run...
+		*/
+		if (write_sq.count < write_sq.max_count) {
+			if (++next_frg >= write_sq.max_count)
+				next_frg = 0 ; /* wrap */
+			/* if we get here then we've underrun so we will stop*/
+			st_le16(&awacs_tx_cmds[next_frg].command, DBDMA_STOP);
+		}
+		/* set the dbdma controller going, if it is not already */
+		if (write_sq.active == 0)
+			out_le32(&awacs_txdma->cmdptr, virt_to_bus(cp));
+		(void)in_le32(&awacs_txdma->status);
+		out_le32(&awacs_txdma->control, ((RUN|WAKE) << 16) + (RUN|WAKE));
+		++write_sq.active;
+	}
+}
+
+static void PMacPlay(void)
+{
+	LOCK();
+	if (!awacs_sleeping) {
+		unsigned long flags;
+
+		spin_lock_irqsave(&dmasound.lock, flags);
+		__PMacPlay();
+		spin_unlock_irqrestore(&dmasound.lock, flags);
+	}
+	UNLOCK();
+}
+
+static void PMacRecord(void)
+{
+	unsigned long flags;
+
+	if (read_sq.active)
+		return;
+
+	spin_lock_irqsave(&dmasound.lock, flags);
+
+	/* This is all we have to do......Just start it up.
+	*/
+	out_le32(&awacs_rxdma->control, ((RUN|WAKE) << 16) + (RUN|WAKE));
+	read_sq.active = 1;
+
+	spin_unlock_irqrestore(&dmasound.lock, flags);
+}
+
+/* if the TX status comes up "DEAD" - reported on some Power Computing machines
+   we need to re-start the dbdma - but from a different physical start address
+   and with a different transfer length.  It would get very messy to do this
+   with the normal dbdma_cmd blocks - we would have to re-write the buffer start
+   addresses each time.  So, we will keep a single dbdma_cmd block which can be
+   fiddled with.
+   When DEAD status is first reported the content of the faulted dbdma block is
+   copied into the emergency buffer and we note that the buffer is in use.
+   we then bump the start physical address by the amount that was successfully
+   output before it died.
+   On any subsequent DEAD result we just do the bump-ups (we know that we are
+   already using the emergency dbdma_cmd).
+   CHECK: this just tries to "do it".  It is possible that we should abandon
+   xfers when the number of residual bytes gets below a certain value - I can
+   see that this might cause a loop-forever if too small a transfer causes
+   DEAD status.  However this is a TODO for now - we'll see what gets reported.
+   When we get a successful transfer result with the emergency buffer we just
+   pretend that it completed using the original dmdma_cmd and carry on.  The
+   'next_cmd' field will already point back to the original loop of blocks.
+*/
+
+static irqreturn_t
+pmac_awacs_tx_intr(int irq, void *devid, struct pt_regs *regs)
+{
+	int i = write_sq.front;
+	int stat;
+	int i_nowrap = write_sq.front;
+	volatile struct dbdma_cmd *cp;
+	/* != 0 when we are dealing with a DEAD xfer */
+	static int emergency_in_use;
+
+	spin_lock(&dmasound.lock);
+	while (write_sq.active > 0) { /* we expect to have done something*/
+		if (emergency_in_use) /* we are dealing with DEAD xfer */
+			cp = emergency_dbdma_cmd ;
+		else
+			cp = &awacs_tx_cmds[i];
+		stat = ld_le16(&cp->xfer_status);
+		if (stat & DEAD) {
+			unsigned short req, res ;
+			unsigned int phy ;
+#ifdef DEBUG_DMASOUND
+printk("dmasound_pmac: tx-irq: xfer died - patching it up...\n") ;
+#endif
+			/* to clear DEAD status we must first clear RUN
+			   set it to quiescent to be on the safe side */
+			(void)in_le32(&awacs_txdma->status);
+			out_le32(&awacs_txdma->control,
+				(RUN|PAUSE|FLUSH|WAKE) << 16);
+			write_sq.died++ ;
+			if (!emergency_in_use) { /* new problem */
+				memcpy((void *)emergency_dbdma_cmd, (void *)cp,
+					sizeof(struct dbdma_cmd));
+				emergency_in_use = 1;
+				cp = emergency_dbdma_cmd;
+			}
+			/* now bump the values to reflect the amount
+			   we haven't yet shifted */
+			req = ld_le16(&cp->req_count);
+			res = ld_le16(&cp->res_count);
+			phy = ld_le32(&cp->phy_addr);
+			phy += (req - res);
+			st_le16(&cp->req_count, res);
+			st_le16(&cp->res_count, 0);
+			st_le16(&cp->xfer_status, 0);
+			st_le32(&cp->phy_addr, phy);
+			st_le32(&cp->cmd_dep, virt_to_bus(&awacs_tx_cmds[(i+1)%write_sq.max_count]));
+			st_le16(&cp->command, OUTPUT_MORE | BR_ALWAYS | INTR_ALWAYS);
+			
+			/* point at our patched up command block */
+			out_le32(&awacs_txdma->cmdptr, virt_to_bus(cp));
+			/* we must re-start the controller */
+			(void)in_le32(&awacs_txdma->status);
+			/* should complete clearing the DEAD status */
+			out_le32(&awacs_txdma->control,
+				((RUN|WAKE) << 16) + (RUN|WAKE));