sound/pci/hda/hda_intel.c

/*
 *
 *  hda_intel.c - Implementation of primary alsa driver code base
 *                for Intel HD Audio.
 *
 *  Copyright(c) 2004 Intel Corporation. All rights reserved.
 *
 *  Copyright (c) 2004 Takashi Iwai <tiwai@suse.de>
 *                     PeiSen Hou <pshou@realtek.com.tw>
 *
 *  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, write to the Free Software Foundation, Inc., 59
 *  Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 *  CONTACTS:
 *
 *  Matt Jared		matt.jared@intel.com
 *  Andy Kopp		andy.kopp@intel.com
 *  Dan Kogan		dan.d.kogan@intel.com
 *
 *  CHANGES:
 *
 *  2004.12.01	Major rewrite by tiwai, merged the work of pshou
 * 
 */

#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/mutex.h>
#include <linux/reboot.h>
#include <linux/io.h>
#include <linux/pm_runtime.h>
#include <linux/clocksource.h>
#include <linux/time.h>
#include <linux/completion.h>

#ifdef CONFIG_X86
/* for snoop control */
#include <asm/pgtable.h>
#include <asm/cacheflush.h>
#endif
#include <sound/core.h>
#include <sound/initval.h>
#include <linux/vgaarb.h>
#include <linux/vga_switcheroo.h>
#include <linux/firmware.h>
#include "hda_codec.h"
#include "hda_i915.h"
#include "hda_priv.h"


static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
static char *model[SNDRV_CARDS];
static int position_fix[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = -1};
static int bdl_pos_adj[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = -1};
static int probe_mask[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = -1};
static int probe_only[SNDRV_CARDS];
static int jackpoll_ms[SNDRV_CARDS];
static bool single_cmd;
static int enable_msi = -1;
#ifdef CONFIG_SND_HDA_PATCH_LOADER
static char *patch[SNDRV_CARDS];
#endif
#ifdef CONFIG_SND_HDA_INPUT_BEEP
static bool beep_mode[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] =
					CONFIG_SND_HDA_INPUT_BEEP_MODE};
#endif

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for Intel HD audio interface.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for Intel HD audio interface.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable Intel HD audio interface.");
module_param_array(model, charp, NULL, 0444);
MODULE_PARM_DESC(model, "Use the given board model.");
module_param_array(position_fix, int, NULL, 0444);
MODULE_PARM_DESC(position_fix, "DMA pointer read method."
		 "(-1 = system default, 0 = auto, 1 = LPIB, 2 = POSBUF, 3 = VIACOMBO, 4 = COMBO).");
module_param_array(bdl_pos_adj, int, NULL, 0644);
MODULE_PARM_DESC(bdl_pos_adj, "BDL position adjustment offset.");
module_param_array(probe_mask, int, NULL, 0444);
MODULE_PARM_DESC(probe_mask, "Bitmask to probe codecs (default = -1).");
module_param_array(probe_only, int, NULL, 0444);
MODULE_PARM_DESC(probe_only, "Only probing and no codec initialization.");
module_param_array(jackpoll_ms, int, NULL, 0444);
MODULE_PARM_DESC(jackpoll_ms, "Ms between polling for jack events (default = 0, using unsol events only)");
module_param(single_cmd, bool, 0444);
MODULE_PARM_DESC(single_cmd, "Use single command to communicate with codecs "
		 "(for debugging only).");
module_param(enable_msi, bint, 0444);
MODULE_PARM_DESC(enable_msi, "Enable Message Signaled Interrupt (MSI)");
#ifdef CONFIG_SND_HDA_PATCH_LOADER
module_param_array(patch, charp, NULL, 0444);
MODULE_PARM_DESC(patch, "Patch file for Intel HD audio interface.");
#endif
#ifdef CONFIG_SND_HDA_INPUT_BEEP
module_param_array(beep_mode, bool, NULL, 0444);
MODULE_PARM_DESC(beep_mode, "Select HDA Beep registration mode "
			    "(0=off, 1=on) (default=1).");
#endif

#ifdef CONFIG_PM
static int param_set_xint(const char *val, const struct kernel_param *kp);
static struct kernel_param_ops param_ops_xint = {
	.set = param_set_xint,
	.get = param_get_int,
};
#define param_check_xint param_check_int

static int power_save = CONFIG_SND_HDA_POWER_SAVE_DEFAULT;
static int *power_save_addr = &power_save;
module_param(power_save, xint, 0644);
MODULE_PARM_DESC(power_save, "Automatic power-saving timeout "
		 "(in second, 0 = disable).");

/* reset the HD-audio controller in power save mode.
 * this may give more power-saving, but will take longer time to
 * wake up.
 */
static bool power_save_controller = 1;
module_param(power_save_controller, bool, 0644);
MODULE_PARM_DESC(power_save_controller, "Reset controller in power save mode.");
#else
static int *power_save_addr;
#endif /* CONFIG_PM */

static int align_buffer_size = -1;
module_param(align_buffer_size, bint, 0644);
MODULE_PARM_DESC(align_buffer_size,
		"Force buffer and period sizes to be multiple of 128 bytes.");

#ifdef CONFIG_X86
static bool hda_snoop = true;
module_param_named(snoop, hda_snoop, bool, 0444);
MODULE_PARM_DESC(snoop, "Enable/disable snooping");
#else
#define hda_snoop		true
#endif


MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{Intel, ICH6},"
			 "{Intel, ICH6M},"
			 "{Intel, ICH7},"
			 "{Intel, ESB2},"
			 "{Intel, ICH8},"
			 "{Intel, ICH9},"
			 "{Intel, ICH10},"
			 "{Intel, PCH},"
			 "{Intel, CPT},"
			 "{Intel, PPT},"
			 "{Intel, LPT},"
			 "{Intel, LPT_LP},"
			 "{Intel, WPT_LP},"
			 "{Intel, HPT},"
			 "{Intel, PBG},"
			 "{Intel, SCH},"
			 "{ATI, SB450},"
			 "{ATI, SB600},"
			 "{ATI, RS600},"
			 "{ATI, RS690},"
			 "{ATI, RS780},"
			 "{ATI, R600},"
			 "{ATI, RV630},"
			 "{ATI, RV610},"
			 "{ATI, RV670},"
			 "{ATI, RV635},"
			 "{ATI, RV620},"
			 "{ATI, RV770},"
			 "{VIA, VT8251},"
			 "{VIA, VT8237A},"
			 "{SiS, SIS966},"
			 "{ULI, M5461}}");
MODULE_DESCRIPTION("Intel HDA driver");

#if defined(CONFIG_PM) && defined(CONFIG_VGA_SWITCHEROO)
#if IS_ENABLED(CONFIG_SND_HDA_CODEC_HDMI)
#define SUPPORT_VGA_SWITCHEROO
#endif
#endif


/*
 */

/* DSP lock helpers */
#ifdef CONFIG_SND_HDA_DSP_LOADER
#define dsp_lock_init(dev)	mutex_init(&(dev)->dsp_mutex)
#define dsp_lock(dev)		mutex_lock(&(dev)->dsp_mutex)
#define dsp_unlock(dev)		mutex_unlock(&(dev)->dsp_mutex)
#define dsp_is_locked(dev)	((dev)->locked)
#else
#define dsp_lock_init(dev)	do {} while (0)
#define dsp_lock(dev)		do {} while (0)
#define dsp_unlock(dev)		do {} while (0)
#define dsp_is_locked(dev)	0
#endif

#define CREATE_TRACE_POINTS
#include "hda_intel_trace.h"

/* driver types */
enum {
	AZX_DRIVER_ICH,
	AZX_DRIVER_PCH,
	AZX_DRIVER_SCH,
	AZX_DRIVER_HDMI,
	AZX_DRIVER_ATI,
	AZX_DRIVER_ATIHDMI,
	AZX_DRIVER_ATIHDMI_NS,
	AZX_DRIVER_VIA,
	AZX_DRIVER_SIS,
	AZX_DRIVER_ULI,
	AZX_DRIVER_NVIDIA,
	AZX_DRIVER_TERA,
	AZX_DRIVER_CTX,
	AZX_DRIVER_CTHDA,
	AZX_DRIVER_GENERIC,
	AZX_NUM_DRIVERS, /* keep this as last entry */
};

/* quirks for Intel PCH */
#define AZX_DCAPS_INTEL_PCH_NOPM \
	(AZX_DCAPS_SCH_SNOOP | AZX_DCAPS_BUFSIZE | \
	 AZX_DCAPS_COUNT_LPIB_DELAY)

#define AZX_DCAPS_INTEL_PCH \
	(AZX_DCAPS_INTEL_PCH_NOPM | AZX_DCAPS_PM_RUNTIME)

#define AZX_DCAPS_INTEL_HASWELL \
	(AZX_DCAPS_SCH_SNOOP | AZX_DCAPS_ALIGN_BUFSIZE | \
	 AZX_DCAPS_COUNT_LPIB_DELAY | AZX_DCAPS_PM_RUNTIME | \
	 AZX_DCAPS_I915_POWERWELL)

/* quirks for ATI SB / AMD Hudson */
#define AZX_DCAPS_PRESET_ATI_SB \
	(AZX_DCAPS_ATI_SNOOP | AZX_DCAPS_NO_TCSEL | \
	 AZX_DCAPS_SYNC_WRITE | AZX_DCAPS_POSFIX_LPIB)

/* quirks for ATI/AMD HDMI */
#define AZX_DCAPS_PRESET_ATI_HDMI \
	(AZX_DCAPS_NO_TCSEL | AZX_DCAPS_SYNC_WRITE | AZX_DCAPS_POSFIX_LPIB)

/* quirks for Nvidia */
#define AZX_DCAPS_PRESET_NVIDIA \
	(AZX_DCAPS_NVIDIA_SNOOP | AZX_DCAPS_RIRB_DELAY | AZX_DCAPS_NO_MSI |\
	 AZX_DCAPS_ALIGN_BUFSIZE | AZX_DCAPS_NO_64BIT)

#define AZX_DCAPS_PRESET_CTHDA \
	(AZX_DCAPS_NO_MSI | AZX_DCAPS_POSFIX_LPIB | AZX_DCAPS_4K_BDLE_BOUNDARY)

/*
 * VGA-switcher support
 */
#ifdef SUPPORT_VGA_SWITCHEROO
#define use_vga_switcheroo(chip)	((chip)->use_vga_switcheroo)
#else
#define use_vga_switcheroo(chip)	0
#endif

static char *driver_short_names[] = {
	[AZX_DRIVER_ICH] = "HDA Intel",
	[AZX_DRIVER_PCH] = "HDA Intel PCH",
	[AZX_DRIVER_SCH] = "HDA Intel MID",
	[AZX_DRIVER_HDMI] = "HDA Intel HDMI",
	[AZX_DRIVER_ATI] = "HDA ATI SB",
	[AZX_DRIVER_ATIHDMI] = "HDA ATI HDMI",
	[AZX_DRIVER_ATIHDMI_NS] = "HDA ATI HDMI",
	[AZX_DRIVER_VIA] = "HDA VIA VT82xx",
	[AZX_DRIVER_SIS] = "HDA SIS966",
	[AZX_DRIVER_ULI] = "HDA ULI M5461",
	[AZX_DRIVER_NVIDIA] = "HDA NVidia",
	[AZX_DRIVER_TERA] = "HDA Teradici", 
	[AZX_DRIVER_CTX] = "HDA Creative", 
	[AZX_DRIVER_CTHDA] = "HDA Creative",
	[AZX_DRIVER_GENERIC] = "HD-Audio Generic",
};

/* for pcm support */
static inline struct azx_dev *get_azx_dev(struct snd_pcm_substream *substream)
{
	return substream->runtime->private_data;
}

#ifdef CONFIG_X86
static void __mark_pages_wc(struct azx *chip, struct snd_dma_buffer *dmab, bool on)
{
	int pages;

	if (azx_snoop(chip))
		return;
	if (!dmab || !dmab->area || !dmab->bytes)
		return;

#ifdef CONFIG_SND_DMA_SGBUF
	if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_SG) {
		struct snd_sg_buf *sgbuf = dmab->private_data;
		if (on)
			set_pages_array_wc(sgbuf->page_table, sgbuf->pages);
		else
			set_pages_array_wb(sgbuf->page_table, sgbuf->pages);
		return;
	}
#endif

	pages = (dmab->bytes + PAGE_SIZE - 1) >> PAGE_SHIFT;
	if (on)
		set_memory_wc((unsigned long)dmab->area, pages);
	else
		set_memory_wb((unsigned long)dmab->area, pages);
}

static inline void mark_pages_wc(struct azx *chip, struct snd_dma_buffer *buf,
				 bool on)
{
	__mark_pages_wc(chip, buf, on);
}
static inline void mark_runtime_wc(struct azx *chip, struct azx_dev *azx_dev,
				   struct snd_pcm_substream *substream, bool on)
{
	if (azx_dev->wc_marked != on) {
		__mark_pages_wc(chip, snd_pcm_get_dma_buf(substream), on);
		azx_dev->wc_marked = on;
	}
}
#else
/* NOP for other archs */
static inline void mark_pages_wc(struct azx *chip, struct snd_dma_buffer *buf,
				 bool on)
{
}
static inline void mark_runtime_wc(struct azx *chip, struct azx_dev *azx_dev,
				   struct snd_pcm_substream *substream, bool on)
{
}
#endif

static int azx_acquire_irq(struct azx *chip, int do_disconnect);
static int azx_send_cmd(struct hda_bus *bus, unsigned int val);
/*
 * Interface for HD codec
 */

/*
 * CORB / RIRB interface
 */
static int azx_alloc_cmd_io(struct azx *chip)
{
	int err;

	/* single page (at least 4096 bytes) must suffice for both ringbuffes */
	err = chip->ops->dma_alloc_pages(chip, SNDRV_DMA_TYPE_DEV,
					 PAGE_SIZE, &chip->rb);
	if (err < 0)
		dev_err(chip->card->dev, "cannot allocate CORB/RIRB\n");
	return err;
}

static void azx_init_cmd_io(struct azx *chip)
{
	int timeout;

	spin_lock_irq(&chip->reg_lock);
	/* CORB set up */
	chip->corb.addr = chip->rb.addr;
	chip->corb.buf = (u32 *)chip->rb.area;
	azx_writel(chip, CORBLBASE, (u32)chip->corb.addr);
	azx_writel(chip, CORBUBASE, upper_32_bits(chip->corb.addr));

	/* set the corb size to 256 entries (ULI requires explicitly) */
	azx_writeb(chip, CORBSIZE, 0x02);
	/* set the corb write pointer to 0 */
	azx_writew(chip, CORBWP, 0);

	/* reset the corb hw read pointer */
	azx_writew(chip, CORBRP, ICH6_CORBRP_RST);
	for (timeout = 1000; timeout > 0; timeout--) {
		if ((azx_readw(chip, CORBRP) & ICH6_CORBRP_RST) == ICH6_CORBRP_RST)
			break;
		udelay(1);
	}
	if (timeout <= 0)
		dev_err(chip->card->dev, "CORB reset timeout#1, CORBRP = %d\n",
			azx_readw(chip, CORBRP));

	azx_writew(chip, CORBRP, 0);
	for (timeout = 1000; timeout > 0; timeout--) {
		if (azx_readw(chip, CORBRP) == 0)
			break;
		udelay(1);
	}
	if (timeout <= 0)
		dev_err(chip->card->dev, "CORB reset timeout#2, CORBRP = %d\n",
			azx_readw(chip, CORBRP));

	/* enable corb dma */
	azx_writeb(chip, CORBCTL, ICH6_CORBCTL_RUN);

	/* RIRB set up */
	chip->rirb.addr = chip->rb.addr + 2048;
	chip->rirb.buf = (u32 *)(chip->rb.area + 2048);
	chip->rirb.wp = chip->rirb.rp = 0;
	memset(chip->rirb.cmds, 0, sizeof(chip->rirb.cmds));
	azx_writel(chip, RIRBLBASE, (u32)chip->rirb.addr);
	azx_writel(chip, RIRBUBASE, upper_32_bits(chip->rirb.addr));

	/* set the rirb size to 256 entries (ULI requires explicitly) */
	azx_writeb(chip, RIRBSIZE, 0x02);
	/* reset the rirb hw write pointer */
	azx_writew(chip, RIRBWP, ICH6_RIRBWP_RST);
	/* set N=1, get RIRB response interrupt for new entry */
	if (chip->driver_caps & AZX_DCAPS_CTX_WORKAROUND)
		azx_writew(chip, RINTCNT, 0xc0);
	else
		azx_writew(chip, RINTCNT, 1);
	/* enable rirb dma and response irq */
	azx_writeb(chip, RIRBCTL, ICH6_RBCTL_DMA_EN | ICH6_RBCTL_IRQ_EN);
	spin_unlock_irq(&chip->reg_lock);
}

static void azx_free_cmd_io(struct azx *chip)
{
	spin_lock_irq(&chip->reg_lock);
	/* disable ringbuffer DMAs */
	azx_writeb(chip, RIRBCTL, 0);
	azx_writeb(chip, CORBCTL, 0);
	spin_unlock_irq(&chip->reg_lock);
}

static unsigned int azx_command_addr(u32 cmd)
{
	unsigned int addr = cmd >> 28;

	if (addr >= AZX_MAX_CODECS) {
		snd_BUG();
		addr = 0;
	}

	return addr;
}

/* send a command */
static int azx_corb_send_cmd(struct hda_bus *bus, u32 val)
{
	struct azx *chip = bus->private_data;
	unsigned int addr = azx_command_addr(val);
	unsigned int wp, rp;

	spin_lock_irq(&chip->reg_lock);

	/* add command to corb */
	wp = azx_readw(chip, CORBWP);
	if (wp == 0xffff) {
		/* something wrong, controller likely turned to D3 */
		spin_unlock_irq(&chip->reg_lock);
		return -EIO;
	}
	wp++;
	wp %= ICH6_MAX_CORB_ENTRIES;

	rp = azx_readw(chip, CORBRP);
	if (wp == rp) {
		/* oops, it's full */
		spin_unlock_irq(&chip->reg_lock);
		return -EAGAIN;
	}

	chip->rirb.cmds[addr]++;
	chip->corb.buf[wp] = cpu_to_le32(val);
	azx_writew(chip, CORBWP, wp);

	spin_unlock_irq(&chip->reg_lock);

	return 0;
}

#define ICH6_RIRB_EX_UNSOL_EV	(1<<4)

/* retrieve RIRB entry - called from interrupt handler */
static void azx_update_rirb(struct azx *chip)
{
	unsigned int rp, wp;
	unsigned int addr;
	u32 res, res_ex;

	wp = azx_readw(chip, RIRBWP);
	if (wp == 0xffff) {
		/* something wrong, controller likely turned to D3 */
		return;
	}

	if (wp == chip->rirb.wp)
		return;
	chip->rirb.wp = wp;

	while (chip->rirb.rp != wp) {
		chip->rirb.rp++;
		chip->rirb.rp %= ICH6_MAX_RIRB_ENTRIES;

		rp = chip->rirb.rp << 1; /* an RIRB entry is 8-bytes */
		res_ex = le32_to_cpu(chip->rirb.buf[rp + 1]);
		res = le32_to_cpu(chip->rirb.buf[rp]);
		addr = res_ex & 0xf;
		if ((addr >= AZX_MAX_CODECS) || !(chip->codec_mask & (1 << addr))) {
			dev_err(chip->card->dev, "spurious response %#x:%#x, rp = %d, wp = %d",
				res, res_ex,
				chip->rirb.rp, wp);
			snd_BUG();
		}
		else if (res_ex & ICH6_RIRB_EX_UNSOL_EV)
			snd_hda_queue_unsol_event(chip->bus, res, res_ex);
		else if (chip->rirb.cmds[addr]) {
			chip->rirb.res[addr] = res;
			smp_wmb();
			chip->rirb.cmds[addr]--;
		} else if (printk_ratelimit()) {
			dev_err(chip->card->dev, "spurious response %#x:%#x, last cmd=%#08x\n",
				res, res_ex,
				chip->last_cmd[addr]);
		}
	}
}

/* receive a response */
static unsigned int azx_rirb_get_response(struct hda_bus *bus,
					  unsigned int addr)
{
	struct azx *chip = bus->private_data;
	unsigned long timeout;
	unsigned long loopcounter;
	int do_poll = 0;

 again:
	timeout = jiffies + msecs_to_jiffies(1000);

	for (loopcounter = 0;; loopcounter++) {
		if (chip->polling_mode || do_poll) {
			spin_lock_irq(&chip->reg_lock);
			azx_update_rirb(chip);
			spin_unlock_irq(&chip->reg_lock);
		}
		if (!chip->rirb.cmds[addr]) {
			smp_rmb();
			bus->rirb_error = 0;

			if (!do_poll)
				chip->poll_count = 0;
			return chip->rirb.res[addr]; /* the last value */
		}
		if (time_after(jiffies, timeout))
			break;
		if (bus->needs_damn_long_delay || loopcounter > 3000)
			msleep(2); /* temporary workaround */
		else {
			udelay(10);
			cond_resched();
		}
	}

	if (!bus->no_response_fallback)
		return -1;

	if (!chip->polling_mode && chip->poll_count < 2) {
		dev_dbg(chip->card->dev,
			"azx_get_response timeout, polling the codec once: last cmd=0x%08x\n",
			chip->last_cmd[addr]);
		do_poll = 1;
		chip->poll_count++;
		goto again;
	}


	if (!chip->polling_mode) {
		dev_warn(chip->card->dev,
			 "azx_get_response timeout, switching to polling mode: last cmd=0x%08x\n",
			 chip->last_cmd[addr]);
		chip->polling_mode = 1;
		goto again;
	}

	if (chip->msi) {
		dev_warn(chip->card->dev,
			 "No response from codec, disabling MSI: last cmd=0x%08x\n",
			 chip->last_cmd[addr]);
		if (chip->ops->disable_msi_reset_irq &&
		    chip->ops->disable_msi_reset_irq(chip) < 0) {
			bus->rirb_error = 1;
			return -1;
		}
		goto again;
	}

	if (chip->probing) {
		/* If this critical timeout happens during the codec probing
		 * phase, this is likely an access to a non-existing codec
		 * slot.  Better to return an error and reset the system.
		 */
		return -1;
	}

	/* a fatal communication error; need either to reset or to fallback
	 * to the single_cmd mode
	 */
	bus->rirb_error = 1;
	if (bus->allow_bus_reset && !bus->response_reset && !bus->in_reset) {
		bus->response_reset = 1;
		return -1; /* give a chance to retry */
	}

	dev_err(chip->card->dev,
		"azx_get_response timeout, switching to single_cmd mode: last cmd=0x%08x\n",
		chip->last_cmd[addr]);
	chip->single_cmd = 1;
	bus->response_reset = 0;
	/* release CORB/RIRB */
	azx_free_cmd_io(chip);
	/* disable unsolicited responses */
	azx_writel(chip, GCTL, azx_readl(chip, GCTL) & ~ICH6_GCTL_UNSOL);
	return -1;
}

/*
 * Use the single immediate command instead of CORB/RIRB for simplicity
 *
 * Note: according to Intel, this is not preferred use.  The command was
 *       intended for the BIOS only, and may get confused with unsolicited
 *       responses.  So, we shouldn't use it for normal operation from the
 *       driver.
 *       I left the codes, however, for debugging/testing purposes.
 */

/* receive a response */
static int azx_single_wait_for_response(struct azx *chip, unsigned int addr)
{
	int timeout = 50;

	while (timeout--) {
		/* check IRV busy bit */
		if (azx_readw(chip, IRS) & ICH6_IRS_VALID) {
			/* reuse rirb.res as the response return value */
			chip->rirb.res[addr] = azx_readl(chip, IR);
			return 0;
		}
		udelay(1);
	}
	if (printk_ratelimit())
		dev_dbg(chip->card->dev, "get_response timeout: IRS=0x%x\n",
			azx_readw(chip, IRS));
	chip->rirb.res[addr] = -1;
	return -EIO;
}

/* send a command */
static int azx_single_send_cmd(struct hda_bus *bus, u32 val)
{
	struct azx *chip = bus->private_data;
	unsigned int addr = azx_command_addr(val);
	int timeout = 50;

	bus->rirb_error = 0;
	while (timeout--) {
		/* check ICB busy bit */
		if (!((azx_readw(chip, IRS) & ICH6_IRS_BUSY))) {
			/* Clear IRV valid bit */
			azx_writew(chip, IRS, azx_readw(chip, IRS) |
				   ICH6_IRS_VALID);
			azx_writel(chip, IC, val);
			azx_writew(chip, IRS, azx_readw(chip, IRS) |
				   ICH6_IRS_BUSY);
			return azx_single_wait_for_response(chip, addr);
		}
		udelay(1);
	}
	if (printk_ratelimit())
		dev_dbg(chip->card->dev,
			"send_cmd timeout: IRS=0x%x, val=0x%x\n",
			azx_readw(chip, IRS), val);
	return -EIO;
}

/* receive a response */
static unsigned int azx_single_get_response(struct hda_bus *bus,
					    unsigned int addr)
{
	struct azx *chip = bus->private_data;
	return chip->rirb.res[addr];
}

/*
 * The below are the main callbacks from hda_codec.
 *
 * They are just the skeleton to call sub-callbacks according to the
 * current setting of chip->single_cmd.
 */

/* send a command */
static int azx_send_cmd(struct hda_bus *bus, unsigned int val)
{
	struct azx *chip = bus->private_data;

	if (chip->disabled)
		return 0;
	chip->last_cmd[azx_command_addr(val)] = val;
	if (chip->single_cmd)
		return azx_single_send_cmd(bus, val);
	else
		return azx_corb_send_cmd(bus, val);
}

/* get a response */
static unsigned int azx_get_response(struct hda_bus *bus,
				     unsigned int addr)
{
	struct azx *chip = bus->private_data;
	if (chip->disabled)
		return 0;
	if (chip->single_cmd)
		return azx_single_get_response(bus, addr);
	else
		return azx_rirb_get_response(bus, addr);
}

#ifdef CONFIG_PM
static void azx_power_notify(struct hda_bus *bus, bool power_up);
#endif

#ifdef CONFIG_SND_HDA_DSP_LOADER
static int azx_load_dsp_prepare(struct hda_bus *bus, unsigned int format,
				unsigned int byte_size,
				struct snd_dma_buffer *bufp);
static void azx_load_dsp_trigger(struct hda_bus *bus, bool start);
static void azx_load_dsp_cleanup(struct hda_bus *bus,
				 struct snd_dma_buffer *dmab);
#endif

/* enter link reset */
static void azx_enter_link_reset(struct azx *chip)
{
	unsigned long timeout;

	/* reset controller */
	azx_writel(chip, GCTL, azx_readl(chip, GCTL) & ~ICH6_GCTL_RESET);

	timeout = jiffies + msecs_to_jiffies(100);
	while ((azx_readb(chip, GCTL) & ICH6_GCTL_RESET) &&
			time_before(jiffies, timeout))
		usleep_range(500, 1000);
}

/* exit link reset */
static void azx_exit_link_reset(struct azx *chip)
{
	unsigned long timeout;

	azx_writeb(chip, GCTL, azx_readb(chip, GCTL) | ICH6_GCTL_RESET);

	timeout = jiffies + msecs_to_jiffies(100);
	while (!azx_readb(chip, GCTL) &&
			time_before(jiffies, timeout))
		usleep_range(500, 1000);
}

/* reset codec link */
static int azx_reset(struct azx *chip, int full_reset)
{
	if (!full_reset)
		goto __skip;

	/* clear STATESTS */
	azx_writew(chip, STATESTS, STATESTS_INT_MASK);

	/* reset controller */
	azx_enter_link_reset(chip);

	/* delay for >= 100us for codec PLL to settle per spec
	 * Rev 0.9 section 5.5.1
	 */
	usleep_range(500, 1000);

	/* Bring controller out of reset */
	azx_exit_link_reset(chip);

	/* Brent Chartrand said to wait >= 540us for codecs to initialize */
	usleep_range(1000, 1200);

      __skip:
	/* check to see if controller is ready */
	if (!azx_readb(chip, GCTL)) {
		dev_dbg(chip->card->dev, "azx_reset: controller not ready!\n");
		return -EBUSY;
	}

	/* Accept unsolicited responses */
	if (!chip->single_cmd)
		azx_writel(chip, GCTL, azx_readl(chip, GCTL) |
			   ICH6_GCTL_UNSOL);

	/* detect codecs */
	if (!chip->codec_mask) {
		chip->codec_mask = azx_readw(chip, STATESTS);
		dev_dbg(chip->card->dev, "codec_mask = 0x%x\n",
			chip->codec_mask);
	}

	return 0;
}


/*
 * Lowlevel interface
 */  

/* enable interrupts */
static void azx_int_enable(struct azx *chip)
{
	/* enable controller CIE and GIE */
	azx_writel(chip, INTCTL, azx_readl(chip, INTCTL) |
		   ICH6_INT_CTRL_EN | ICH6_INT_GLOBAL_EN);
}

/* disable interrupts */
static void azx_int_disable(struct azx *chip)
{
	int i;

	/* disable interrupts in stream descriptor */
	for (i = 0; i < chip->num_streams; i++) {
		struct azx_dev *azx_dev = &chip->azx_dev[i];
		azx_sd_writeb(chip, azx_dev, SD_CTL,
			      azx_sd_readb(chip, azx_dev, SD_CTL) &
					~SD_INT_MASK);
	}

	/* disable SIE for all streams */
	azx_writeb(chip, INTCTL, 0);

	/* disable controller CIE and GIE */
	azx_writel(chip, INTCTL, azx_readl(chip, INTCTL) &
		   ~(ICH6_INT_CTRL_EN | ICH6_INT_GLOBAL_EN));
}

/* clear interrupts */
static void azx_int_clear(struct azx *chip)
{
	int i;

	/* clear stream status */
	for (i = 0; i < chip->num_streams; i++) {
		struct azx_dev *azx_dev = &chip->azx_dev[i];
		azx_sd_writeb(chip, azx_dev, SD_STS, SD_INT_MASK);
	}

	/* clear STATESTS */
	azx_writew(chip, STATESTS, STATESTS_INT_MASK);

	/* clear rirb status */
	azx_writeb(chip, RIRBSTS, RIRB_INT_MASK);

	/* clear int status */
	azx_writel(chip, INTSTS, ICH6_INT_CTRL_EN | ICH6_INT_ALL_STREAM);
}

/* start a stream */
static void azx_stream_start(struct azx *chip, struct azx_dev *azx_dev)
{
	/*
	 * Before stream start, initialize parameter
	 */
	azx_dev->insufficient = 1;

	/* enable SIE */
	azx_writel(chip, INTCTL,
		   azx_readl(chip, INTCTL) | (1 << azx_dev->index));
	/* set DMA start and interrupt mask */
	azx_sd_writeb(chip, azx_dev, SD_CTL,
		      azx_sd_readb(chip, azx_dev, SD_CTL) |
		      SD_CTL_DMA_START | SD_INT_MASK);
}

/* stop DMA */
static void azx_stream_clear(struct azx *chip, struct azx_dev *azx_dev)
{
	azx_sd_writeb(chip, azx_dev, SD_CTL,
		      azx_sd_readb(chip, azx_dev, SD_CTL) &
		      ~(SD_CTL_DMA_START | SD_INT_MASK));
	azx_sd_writeb(chip, azx_dev, SD_STS, SD_INT_MASK); /* to be sure */
}

/* stop a stream */
static void azx_stream_stop(struct azx *chip, struct azx_dev *azx_dev)
{
	azx_stream_clear(chip, azx_dev);
	/* disable SIE */
	azx_writel(chip, INTCTL,
		   azx_readl(chip, INTCTL) & ~(1 << azx_dev->index));
}


/*
 * reset and start the controller registers
 */
static void azx_init_chip(struct azx *chip, int full_reset)
{
	if (chip->initialized)
		return;

	/* reset controller */
	azx_reset(chip, full_reset);

	/* initialize interrupts */
	azx_int_clear(chip);
	azx_int_enable(chip);

	/* initialize the codec command I/O */
	if (!chip->single_cmd)
		azx_init_cmd_io(chip);

	/* program the position buffer */
	azx_writel(chip, DPLBASE, (u32)chip->posbuf.addr);
	azx_writel(chip, DPUBASE, upper_32_bits(chip->posbuf.addr));

	chip->initialized = 1;
}

/*
 * initialize the PCI registers
 */
/* update bits in a PCI register byte */
static void update_pci_byte(struct pci_dev *pci, unsigned int reg,
			    unsigned char mask, unsigned char val)
{
	unsigned char data;

	pci_read_config_byte(pci, reg, &data);
	data &= ~mask;
	data |= (val & mask);
	pci_write_config_byte(pci, reg, data);
}

static void azx_init_pci(struct azx *chip)
{
	/* Clear bits 0-2 of PCI register TCSEL (at offset 0x44)
	 * TCSEL == Traffic Class Select Register, which sets PCI express QOS
	 * Ensuring these bits are 0 clears playback static on some HD Audio
	 * codecs.
	 * The PCI register TCSEL is defined in the Intel manuals.
	 */
	if (!(chip->driver_caps & AZX_DCAPS_NO_TCSEL)) {
		dev_dbg(chip->card->dev, "Clearing TCSEL\n");
		update_pci_byte(chip->pci, ICH6_PCIREG_TCSEL, 0x07, 0);
	}

	/* For ATI SB450/600/700/800/900 and AMD Hudson azalia HD audio,
	 * we need to enable snoop.
	 */
	if (chip->driver_caps & AZX_DCAPS_ATI_SNOOP) {
		dev_dbg(chip->card->dev, "Setting ATI snoop: %d\n",
			azx_snoop(chip));
		update_pci_byte(chip->pci,
				ATI_SB450_HDAUDIO_MISC_CNTR2_ADDR, 0x07,
				azx_snoop(chip) ? ATI_SB450_HDAUDIO_ENABLE_SNOOP : 0);
	}

	/* For NVIDIA HDA, enable snoop */
	if (chip->driver_caps & AZX_DCAPS_NVIDIA_SNOOP) {
		dev_dbg(chip->card->dev, "Setting Nvidia snoop: %d\n",
			azx_snoop(chip));
		update_pci_byte(chip->pci,
				NVIDIA_HDA_TRANSREG_ADDR,
				0x0f, NVIDIA_HDA_ENABLE_COHBITS);
		update_pci_byte(chip->pci,
				NVIDIA_HDA_ISTRM_COH,
				0x01, NVIDIA_HDA_ENABLE_COHBIT);
		update_pci_byte(chip->pci,
				NVIDIA_HDA_OSTRM_COH,
				0x01, NVIDIA_HDA_ENABLE_COHBIT);
	}

	/* Enable SCH/PCH snoop if needed */
	if (chip->driver_caps & AZX_DCAPS_SCH_SNOOP) {
		unsigned short snoop;
		pci_read_config_word(chip->pci, INTEL_SCH_HDA_DEVC, &snoop);
		if ((!azx_snoop(chip) && !(snoop & INTEL_SCH_HDA_DEVC_NOSNOOP)) ||
		    (azx_snoop(chip) && (snoop & INTEL_SCH_HDA_DEVC_NOSNOOP))) {
			snoop &= ~INTEL_SCH_HDA_DEVC_NOSNOOP;
			if (!azx_snoop(chip))
				snoop |= INTEL_SCH_HDA_DEVC_NOSNOOP;
			pci_write_config_word(chip->pci, INTEL_SCH_HDA_DEVC, snoop);
			pci_read_config_word(chip->pci,
				INTEL_SCH_HDA_DEVC, &snoop);
		}
		dev_dbg(chip->card->dev, "SCH snoop: %s\n",
			(snoop & INTEL_SCH_HDA_DEVC_NOSNOOP) ?
			"Disabled" : "Enabled");
        }
}


static int azx_position_ok(struct azx *chip, struct azx_dev *azx_dev);

/*
 * interrupt handler
 */
static irqreturn_t azx_interrupt(int irq, void *dev_id)
{
	struct azx *chip = dev_id;
	struct azx_dev *azx_dev;
	u32 status;
	u8 sd_status;
	int i, ok;

#ifdef CONFIG_PM_RUNTIME
	if (chip->driver_caps & AZX_DCAPS_PM_RUNTIME)
		if (chip->card->dev->power.runtime_status != RPM_ACTIVE)
			return IRQ_NONE;
#endif

	spin_lock(&chip->reg_lock);

	if (chip->disabled) {
		spin_unlock(&chip->reg_lock);
		return IRQ_NONE;
	}

	status = azx_readl(chip, INTSTS);
	if (status == 0 || status == 0xffffffff) {
		spin_unlock(&chip->reg_lock);
		return IRQ_NONE;
	}
	
	for (i = 0; i < chip->num_streams; i++) {
		azx_dev = &chip->azx_dev[i];
		if (status & azx_dev->sd_int_sta_mask) {
			sd_status = azx_sd_readb(chip, azx_dev, SD_STS);
			azx_sd_writeb(chip, azx_dev, SD_STS, SD_INT_MASK);
			if (!azx_dev->substream || !azx_dev->running ||
			    !(sd_status & SD_INT_COMPLETE))
				continue;
			/* check whether this IRQ is really acceptable */
			ok = azx_position_ok(chip, azx_dev);
			if (ok == 1) {
				azx_dev->irq_pending = 0;
				spin_unlock(&chip->reg_lock);
				snd_pcm_period_elapsed(azx_dev->substream);
				spin_lock(&chip->reg_lock);
			} else if (ok == 0 && chip->bus && chip->bus->workq) {
				/* bogus IRQ, process it later */
				azx_dev->irq_pending = 1;
				queue_work(chip->bus->workq,
					   &chip->irq_pending_work);
			}
		}
	}

	/* clear rirb int */
	status = azx_readb(chip, RIRBSTS);
	if (status & RIRB_INT_MASK) {
		if (status & RIRB_INT_RESPONSE) {
			if (chip->driver_caps & AZX_DCAPS_RIRB_PRE_DELAY)
				udelay(80);
			azx_update_rirb(chip);
		}
		azx_writeb(chip, RIRBSTS, RIRB_INT_MASK);
	}

	spin_unlock(&chip->reg_lock);
	
	return IRQ_HANDLED;
}


/*
 * set up a BDL entry
 */
static int setup_bdle(struct azx *chip,
		      struct snd_dma_buffer *dmab,
		      struct azx_dev *azx_dev, u32 **bdlp,
		      int ofs, int size, int with_ioc)
{
	u32 *bdl = *bdlp;

	while (size > 0) {
		dma_addr_t addr;
		int chunk;

		if (azx_dev->frags >= AZX_MAX_BDL_ENTRIES)
			return -EINVAL;

		addr = snd_sgbuf_get_addr(dmab, ofs);
		/* program the address field of the BDL entry */
		bdl[0] = cpu_to_le32((u32)addr);
		bdl[1] = cpu_to_le32(upper_32_bits(addr));
		/* program the size field of the BDL entry */
		chunk = snd_sgbuf_get_chunk_size(dmab, ofs, size);
		/* one BDLE cannot cross 4K boundary on CTHDA chips */
		if (chip->driver_caps & AZX_DCAPS_4K_BDLE_BOUNDARY) {
			u32 remain = 0x1000 - (ofs & 0xfff);
			if (chunk > remain)
				chunk = remain;
		}
		bdl[2] = cpu_to_le32(chunk);
		/* program the IOC to enable interrupt
		 * only when the whole fragment is processed
		 */
		size -= chunk;
		bdl[3] = (size || !with_ioc) ? 0 : cpu_to_le32(0x01);
		bdl += 4;
		azx_dev->frags++;
		ofs += chunk;
	}
	*bdlp = bdl;
	return ofs;
}

/*
 * set up BDL entries
 */
static int azx_setup_periods(struct azx *chip,
			     struct snd_pcm_substream *substream,
			     struct azx_dev *azx_dev)
{
	u32 *bdl;
	int i, ofs, periods, period_bytes;
	int pos_adj = 0;

	/* reset BDL address */
	azx_sd_writel(chip, azx_dev, SD_BDLPL, 0);
	azx_sd_writel(chip, azx_dev, SD_BDLPU, 0);

	period_bytes = azx_dev->period_bytes;
	periods = azx_dev->bufsize / period_bytes;

	/* program the initial BDL entries */
	bdl = (u32 *)azx_dev->bdl.area;
	ofs = 0;
	azx_dev->frags = 0;

	if (chip->bdl_pos_adj)
		pos_adj = chip->bdl_pos_adj[chip->dev_index];
	if (!azx_dev->no_period_wakeup && pos_adj > 0) {
		struct snd_pcm_runtime *runtime = substream->runtime;
		int pos_align = pos_adj;
		pos_adj = (pos_adj * runtime->rate + 47999) / 48000;
		if (!pos_adj)
			pos_adj = pos_align;
		else
			pos_adj = ((pos_adj + pos_align - 1) / pos_align) *
				pos_align;
		pos_adj = frames_to_bytes(runtime, pos_adj);
		if (pos_adj >= period_bytes) {
			dev_warn(chip->card->dev,"Too big adjustment %d\n",
				 pos_adj);
			pos_adj = 0;
		} else {
			ofs = setup_bdle(chip, snd_pcm_get_dma_buf(substream),
					 azx_dev,
					 &bdl, ofs, pos_adj, true);
			if (ofs < 0)
				goto error;
		}
	} else
		pos_adj = 0;

	for (i = 0; i < periods; i++) {
		if (i == periods - 1 && pos_adj)
			ofs = setup_bdle(chip, snd_pcm_get_dma_buf(substream),
					 azx_dev, &bdl, ofs,
					 period_bytes - pos_adj, 0);
		else
			ofs = setup_bdle(chip, snd_pcm_get_dma_buf(substream),
					 azx_dev, &bdl, ofs,
					 period_bytes,
					 !azx_dev->no_period_wakeup);
		if (ofs < 0)
			goto error;
	}
	return 0;

 error:
	dev_err(chip->card->dev, "Too many BDL entries: buffer=%d, period=%d\n",
		azx_dev->bufsize, period_bytes);
	return -EINVAL;
}

/* reset stream */
static void azx_stream_reset(struct azx *chip, struct azx_dev *azx_dev)
{
	unsigned char val;
	int timeout;

	azx_stream_clear(chip, azx_dev);

	azx_sd_writeb(chip, azx_dev, SD_CTL,
		      azx_sd_readb(chip, azx_dev, SD_CTL) |
		      SD_CTL_STREAM_RESET);
	udelay(3);
	timeout = 300;
	while (!((val = azx_sd_readb(chip, azx_dev, SD_CTL)) &
		 SD_CTL_STREAM_RESET) && --timeout)
		;
	val &= ~SD_CTL_STREAM_RESET;
	azx_sd_writeb(chip, azx_dev, SD_CTL, val);
	udelay(3);

	timeout = 300;
	/* waiting for hardware to report that the stream is out of reset */
	while (((val = azx_sd_readb(chip, azx_dev, SD_CTL)) &
		SD_CTL_STREAM_RESET) && --timeout)
		;

	/* reset first position - may not be synced with hw at this time */
	*azx_dev->posbuf = 0;
}

/*
 * set up the SD for streaming
 */
static int azx_setup_controller(struct azx *chip, struct azx_dev *azx_dev)
{
	unsigned int val;
	/* make sure the run bit is zero for SD */
	azx_stream_clear(chip, azx_dev);
	/* program the stream_tag */
	val = azx_sd_readl(chip, azx_dev, SD_CTL);
	val = (val & ~SD_CTL_STREAM_TAG_MASK) |
		(azx_dev->stream_tag << SD_CTL_STREAM_TAG_SHIFT);
	if (!azx_snoop(chip))
		val |= SD_CTL_TRAFFIC_PRIO;
	azx_sd_writel(chip, azx_dev, SD_CTL, val);

	/* program the length of samples in cyclic buffer */
	azx_sd_writel(chip, azx_dev, SD_CBL, azx_dev->bufsize);

	/* program the stream format */
	/* this value needs to be the same as the one programmed */
	azx_sd_writew(chip, azx_dev, SD_FORMAT, azx_dev->format_val);

	/* program the stream LVI (last valid index) of the BDL */
	azx_sd_writew(chip, azx_dev, SD_LVI, azx_dev->frags - 1);

	/* program the BDL address */
	/* lower BDL address */
	azx_sd_writel(chip, azx_dev, SD_BDLPL, (u32)azx_dev->bdl.addr);
	/* upper BDL address */
	azx_sd_writel(chip, azx_dev, SD_BDLPU,
		      upper_32_bits(azx_dev->bdl.addr));

	/* enable the position buffer */
	if (chip->position_fix[0] != POS_FIX_LPIB ||
	    chip->position_fix[1] != POS_FIX_LPIB) {
		if (!(azx_readl(chip, DPLBASE) & ICH6_DPLBASE_ENABLE))
			azx_writel(chip, DPLBASE,
				(u32)chip->posbuf.addr | ICH6_DPLBASE_ENABLE);
	}

	/* set the interrupt enable bits in the descriptor control register */
	azx_sd_writel(chip, azx_dev, SD_CTL,
		      azx_sd_readl(chip, azx_dev, SD_CTL) | SD_INT_MASK);

	return 0;
}

/*
 * Probe the given codec address
 */
static int probe_codec(struct azx *chip, int addr)
{
	unsigned int cmd = (addr << 28) | (AC_NODE_ROOT << 20) |
		(AC_VERB_PARAMETERS << 8) | AC_PAR_VENDOR_ID;
	unsigned int res;

	mutex_lock(&chip->bus->cmd_mutex);
	chip->probing = 1;
	azx_send_cmd(chip->bus, cmd);
	res = azx_get_response(chip->bus, addr);
	chip->probing = 0;
	mutex_unlock(&chip->bus->cmd_mutex);
	if (res == -1)
		return -EIO;
	dev_dbg(chip->card->dev, "codec #%d probed OK\n", addr);
	return 0;
}

static int azx_attach_pcm_stream(struct hda_bus *bus, struct hda_codec *codec,
				 struct hda_pcm *cpcm);
static void azx_stop_chip(struct azx *chip);

static void azx_bus_reset(struct hda_bus *bus)
{
	struct azx *chip = bus->private_data;

	bus->in_reset = 1;
	azx_stop_chip(chip);
	azx_init_chip(chip, 1);
#ifdef CONFIG_PM
	if (chip->initialized) {
		struct azx_pcm *p;
		list_for_each_entry(p, &chip->pcm_list, list)
			snd_pcm_suspend_all(p->pcm);
		snd_hda_suspend(chip->bus);
		snd_hda_resume(chip->bus);
	}
#endif
	bus->in_reset = 0;
}

static int get_jackpoll_interval(struct azx *chip)
{
	int i;
	unsigned int j;

	if (!chip->jackpoll_ms)
		return 0;

	i = chip->jackpoll_ms[chip->dev_index];
	if (i == 0)
		return 0;
	if (i < 50 || i > 60000)
		j = 0;
	else
		j = msecs_to_jiffies(i);
	if (j == 0)
		dev_warn(chip->card->dev,
			 "jackpoll_ms value out of range: %d\n", i);
	return j;
}

/*
 * Codec initialization
 */

static int azx_codec_create(struct azx *chip, const char *model,
			    unsigned int max_slots,
			    int *power_save_to)
{
	struct hda_bus_template bus_temp;
	int c, codecs, err;

	memset(&bus_temp, 0, sizeof(bus_temp));
	bus_temp.private_data = chip;
	bus_temp.modelname = model;
	bus_temp.pci = chip->pci;
	bus_temp.ops.command = azx_send_cmd;
	bus_temp.ops.get_response = azx_get_response;
	bus_temp.ops.attach_pcm = azx_attach_pcm_stream;
	bus_temp.ops.bus_reset = azx_bus_reset;
#ifdef CONFIG_PM
	bus_temp.power_save = power_save_to;
	bus_temp.ops.pm_notify = azx_power_notify;
#endif
#ifdef CONFIG_SND_HDA_DSP_LOADER
	bus_temp.ops.load_dsp_prepare = azx_load_dsp_prepare;
	bus_temp.ops.load_dsp_trigger = azx_load_dsp_trigger;
	bus_temp.ops.load_dsp_cleanup = azx_load_dsp_cleanup;
#endif

	err = snd_hda_bus_new(chip->card, &bus_temp, &chip->bus);
	if (err < 0)
		return err;

	if (chip->driver_caps & AZX_DCAPS_RIRB_DELAY) {
		dev_dbg(chip->card->dev, "Enable delay in RIRB handling\n");
		chip->bus->needs_damn_long_delay = 1;
	}

	codecs = 0;
	if (!max_slots)
		max_slots = AZX_DEFAULT_CODECS;

	/* First try to probe all given codec slots */
	for (c = 0; c < max_slots; c++) {
		if ((chip->codec_mask & (1 << c)) & chip->codec_probe_mask) {
			if (probe_codec(chip, c) < 0) {
				/* Some BIOSen give you wrong codec addresses
				 * that don't exist
				 */
				dev_warn(chip->card->dev,
					 "Codec #%d probe error; disabling it...\n", c);
				chip->codec_mask &= ~(1 << c);
				/* More badly, accessing to a non-existing
				 * codec often screws up the controller chip,
				 * and disturbs the further communications.
				 * Thus if an error occurs during probing,
				 * better to reset the controller chip to
				 * get back to the sanity state.
				 */
				azx_stop_chip(chip);
				azx_init_chip(chip, 1);
			}
		}
	}

	/* AMD chipsets often cause the communication stalls upon certain
	 * sequence like the pin-detection.  It seems that forcing the synced
	 * access works around the stall.  Grrr...
	 */
	if (chip->driver_caps & AZX_DCAPS_SYNC_WRITE) {
		dev_dbg(chip->card->dev, "Enable sync_write for stable communication\n");
		chip->bus->sync_write = 1;
		chip->bus->allow_bus_reset = 1;
	}

	/* Then create codec instances */
	for (c = 0; c < max_slots; c++) {
		if ((chip->codec_mask & (1 << c)) & chip->codec_probe_mask) {
			struct hda_codec *codec;
			err = snd_hda_codec_new(chip->bus, c, &codec);
			if (err < 0)
				continue;
			codec->jackpoll_interval = get_jackpoll_interval(chip);
			codec->beep_mode = chip->beep_mode;
			codecs++;
		}
	}
	if (!codecs) {
		dev_err(chip->card->dev, "no codecs initialized\n");
		return -ENXIO;
	}
	return 0;
}

/* configure each codec instance */
static int azx_codec_configure(struct azx *chip)
{
	struct hda_codec *codec;
	list_for_each_entry(codec, &chip->bus->codec_list, list) {
		snd_hda_codec_configure(codec);
	}
	return 0;
}


/*
 * PCM support
 */

/* assign a stream for the PCM */
static inline struct azx_dev *
azx_assign_device(struct azx *chip, struct snd_pcm_substream *substream)
{
	int dev, i, nums;
	struct azx_dev *res = NULL;
	/* make a non-zero unique key for the substream */
	int key = (substream->pcm->device << 16) | (substream->number << 2) |
		(substream->stream + 1);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		dev = chip->playback_index_offset;
		nums = chip->playback_streams;
	} else {
		dev = chip->capture_index_offset;
		nums = chip->capture_streams;
	}
	for (i = 0; i < nums; i++, dev++) {
		struct azx_dev *azx_dev = &chip->azx_dev[dev];
		dsp_lock(azx_dev);
		if (!azx_dev->opened && !dsp_is_locked(azx_dev)) {
			res = azx_dev;
			if (res->assigned_key == key) {
				res->opened = 1;
				res->assigned_key = key;
				dsp_unlock(azx_dev);
				return azx_dev;
			}
		}
		dsp_unlock(azx_dev);
	}
	if (res) {
		dsp_lock(res);
		res->opened = 1;
		res->assigned_key = key;
		dsp_unlock(res);
	}
	return res;
}

/* release the assigned stream */
static inline void azx_release_device(struct azx_dev *azx_dev)
{
	azx_dev->opened = 0;
}

static cycle_t azx_cc_read(const struct cyclecounter *cc)
{
	struct azx_dev *azx_dev = container_of(cc, struct azx_dev, azx_cc);
	struct snd_pcm_substream *substream = azx_dev->substream;
	struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
	struct azx *chip = apcm->chip;

	return azx_readl(chip, WALLCLK);
}

static void azx_timecounter_init(struct snd_pcm_substream *substream,
				bool force, cycle_t last)
{
	struct azx_dev *azx_dev = get_azx_dev(substream);
	struct timecounter *tc = &azx_dev->azx_tc;
	struct cyclecounter *cc = &azx_dev->azx_cc;
	u64 nsec;

	cc->read = azx_cc_read;
	cc->mask = CLOCKSOURCE_MASK(32);

	/*
	 * Converting from 24 MHz to ns means applying a 125/3 factor.
	 * To avoid any saturation issues in intermediate operations,
	 * the 125 factor is applied first. The division is applied
	 * last after reading the timecounter value.
	 * Applying the 1/3 factor as part of the multiplication
	 * requires at least 20 bits for a decent precision, however
	 * overflows occur after about 4 hours or less, not a option.
	 */

	cc->mult = 125; /* saturation after 195 years */
	cc->shift = 0;

	nsec = 0; /* audio time is elapsed time since trigger */
	timecounter_init(tc, cc, nsec);
	if (force)
		/*
		 * force timecounter to use predefined value,
		 * used for synchronized starts
		 */
		tc->cycle_last = last;
}

static u64 azx_adjust_codec_delay(struct snd_pcm_substream *substream,
				u64 nsec)
{
	struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
	struct hda_pcm_stream *hinfo = apcm->hinfo[substream->stream];
	u64 codec_frames, codec_nsecs;

	if (!hinfo->ops.get_delay)
		return nsec;

	codec_frames = hinfo->ops.get_delay(hinfo, apcm->codec, substream);
	codec_nsecs = div_u64(codec_frames * 1000000000LL,
			      substream->runtime->rate);

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
		return nsec + codec_nsecs;

	return (nsec > codec_nsecs) ? nsec - codec_nsecs : 0;
}

static int azx_get_wallclock_tstamp(struct snd_pcm_substream *substream,
				struct timespec *ts)
{
	struct azx_dev *azx_dev = get_azx_dev(substream);
	u64 nsec;

	nsec = timecounter_read(&azx_dev->azx_tc);
	nsec = div_u64(nsec, 3); /* can be optimized */
	nsec = azx_adjust_codec_delay(substream, nsec);

	*ts = ns_to_timespec(nsec);

	return 0;
}

static struct snd_pcm_hardware azx_pcm_hw = {
	.info =			(SNDRV_PCM_INFO_MMAP |
				 SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_BLOCK_TRANSFER |
				 SNDRV_PCM_INFO_MMAP_VALID |
				 /* No full-resume yet implemented */
				 /* SNDRV_PCM_INFO_RESUME |*/
				 SNDRV_PCM_INFO_PAUSE |
				 SNDRV_PCM_INFO_SYNC_START |
				 SNDRV_PCM_INFO_HAS_WALL_CLOCK |
				 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP),
	.formats =		SNDRV_PCM_FMTBIT_S16_LE,
	.rates =		SNDRV_PCM_RATE_48000,
	.rate_min =		48000,
	.rate_max =		48000,
	.channels_min =		2,
	.channels_max =		2,
	.buffer_bytes_max =	AZX_MAX_BUF_SIZE,
	.period_bytes_min =	128,
	.period_bytes_max =	AZX_MAX_BUF_SIZE / 2,
	.periods_min =		2,
	.periods_max =		AZX_MAX_FRAG,
	.fifo_size =		0,
};

static int azx_pcm_open(struct snd_pcm_substream *substream)
{
	struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
	struct hda_pcm_stream *hinfo = apcm->hinfo[substream->stream];
	struct azx *chip = apcm->chip;
	struct azx_dev *azx_dev;
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned long flags;
	int err;
	int buff_step;

	mutex_lock(&chip->open_mutex);
	azx_dev = azx_assign_device(chip, substream);
	if (azx_dev == NULL) {
		mutex_unlock(&chip->open_mutex);
		return -EBUSY;
	}
	runtime->hw = azx_pcm_hw;
	runtime->hw.channels_min = hinfo->channels_min;
	runtime->hw.channels_max = hinfo->channels_max;
	runtime->hw.formats = hinfo->formats;
	runtime->hw.rates = hinfo->rates;
	snd_pcm_limit_hw_rates(runtime);
	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);

	/* avoid wrap-around with wall-clock */
	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
				20,
				178000000);

	if (chip->align_buffer_size)
		/* constrain buffer sizes to be multiple of 128
		   bytes. This is more efficient in terms of memory
		   access but isn't required by the HDA spec and
		   prevents users from specifying exact period/buffer
		   sizes. For example for 44.1kHz, a period size set
		   to 20ms will be rounded to 19.59ms. */
		buff_step = 128;
	else
		/* Don't enforce steps on buffer sizes, still need to
		   be multiple of 4 bytes (HDA spec). Tested on Intel
		   HDA controllers, may not work on all devices where
		   option needs to be disabled */
		buff_step = 4;

	snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
				   buff_step);
	snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
				   buff_step);
	snd_hda_power_up_d3wait(apcm->codec);
	err = hinfo->ops.open(hinfo, apcm->codec, substream);
	if (err < 0) {
		azx_release_device(azx_dev);
		snd_hda_power_down(apcm->codec);
		mutex_unlock(&chip->open_mutex);
		return err;
	}
	snd_pcm_limit_hw_rates(runtime);
	/* sanity check */
	if (snd_BUG_ON(!runtime->hw.channels_min) ||
	    snd_BUG_ON(!runtime->hw.channels_max) ||
	    snd_BUG_ON(!runtime->hw.formats) ||
	    snd_BUG_ON(!runtime->hw.rates)) {
		azx_release_device(azx_dev);
		hinfo->ops.close(hinfo, apcm->codec, substream);
		snd_hda_power_down(apcm->codec);
		mutex_unlock(&chip->open_mutex);
		return -EINVAL;
	}

	/* disable WALLCLOCK timestamps for capture streams
	   until we figure out how to handle digital inputs */
	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
		runtime->hw.info &= ~SNDRV_PCM_INFO_HAS_WALL_CLOCK;

	spin_lock_irqsave(&chip->reg_lock, flags);
	azx_dev->substream = substream;
	azx_dev->running = 0;
	spin_unlock_irqrestore(&chip->reg_lock, flags);

	runtime->private_data = azx_dev;
	snd_pcm_set_sync(substream);
	mutex_unlock(&chip->open_mutex);
	return 0;
}

static int azx_pcm_close(struct snd_pcm_substream *substream)
{
	struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
	struct hda_pcm_stream *hinfo = apcm->hinfo[substream->stream];
	struct azx *chip = apcm->chip;
	struct azx_dev *azx_dev = get_azx_dev(substream);
	unsigned long flags;

	mutex_lock(&chip->open_mutex);
	spin_lock_irqsave(&chip->reg_lock, flags);
	azx_dev->substream = NULL;
	azx_dev->running = 0;
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	azx_release_device(azx_dev);
	hinfo->ops.close(hinfo, apcm->codec, substream);
	snd_hda_power_down(apcm->codec);
	mutex_unlock(&chip->open_mutex);
	return 0;
}

static int azx_pcm_hw_params(struct snd_pcm_substream *substream,
			     struct snd_pcm_hw_params *hw_params)
{
	struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
	struct azx *chip = apcm->chip;
	int ret;

	dsp_lock(get_azx_dev(substream));
	if (dsp_is_locked(get_azx_dev(substream))) {
		ret = -EBUSY;
		goto unlock;
	}

	ret = chip->ops->substream_alloc_pages(chip, substream,
					       params_buffer_bytes(hw_params));
unlock:
	dsp_unlock(get_azx_dev(substream));
	return ret;
}

static int azx_pcm_hw_free(struct snd_pcm_substream *substream)
{
	struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
	struct azx_dev *azx_dev = get_azx_dev(substream);
	struct azx *chip = apcm->chip;
	struct hda_pcm_stream *hinfo = apcm->hinfo[substream->stream];
	int err;

	/* reset BDL address */
	dsp_lock(azx_dev);
	if (!dsp_is_locked(azx_dev)) {
		azx_sd_writel(chip, azx_dev, SD_BDLPL, 0);
		azx_sd_writel(chip, azx_dev, SD_BDLPU, 0);
		azx_sd_writel(chip, azx_dev, SD_CTL, 0);
		azx_dev->bufsize = 0;
		azx_dev->period_bytes = 0;
		azx_dev->format_val = 0;
	}

	snd_hda_codec_cleanup(apcm->codec, hinfo, substream);

	err = chip->ops->substream_free_pages(chip, substream);
	azx_dev->prepared = 0;
	dsp_unlock(azx_dev);
	return err;
}

static int azx_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
	struct azx *chip = apcm->chip;
	struct azx_dev *azx_dev = get_azx_dev(substream);
	struct hda_pcm_stream *hinfo = apcm->hinfo[substream->stream];
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned int bufsize, period_bytes, format_val, stream_tag;
	int err;
	struct hda_spdif_out *spdif =
		snd_hda_spdif_out_of_nid(apcm->codec, hinfo->nid);
	unsigned short ctls = spdif ? spdif->ctls : 0;

	dsp_lock(azx_dev);
	if (dsp_is_locked(azx_dev)) {
		err = -EBUSY;
		goto unlock;
	}

	azx_stream_reset(chip, azx_dev);
	format_val = snd_hda_calc_stream_format(runtime->rate,
						runtime->channels,
						runtime->format,
						hinfo->maxbps,
						ctls);
	if (!format_val) {
		dev_err(chip->card->dev,
			"invalid format_val, rate=%d, ch=%d, format=%d\n",
			runtime->rate, runtime->channels, runtime->format);
		err = -EINVAL;
		goto unlock;
	}

	bufsize = snd_pcm_lib_buffer_bytes(substream);
	period_bytes = snd_pcm_lib_period_bytes(substream);

	dev_dbg(chip->card->dev, "azx_pcm_prepare: bufsize=0x%x, format=0x%x\n",
		bufsize, format_val);

	if (bufsize != azx_dev->bufsize ||
	    period_bytes != azx_dev->period_bytes ||
	    format_val != azx_dev->format_val ||
	    runtime->no_period_wakeup != azx_dev->no_period_wakeup) {
		azx_dev->bufsize = bufsize;
		azx_dev->period_bytes = period_bytes;
		azx_dev->format_val = format_val;
		azx_dev->no_period_wakeup = runtime->no_period_wakeup;
		err = azx_setup_periods(chip, substream, azx_dev);
		if (err < 0)
			goto unlock;
	}

	/* when LPIB delay correction gives a small negative value,
	 * we ignore it; currently set the threshold statically to
	 * 64 frames
	 */
	if (runtime->period_size > 64)
		azx_dev->delay_negative_threshold = -frames_to_bytes(runtime, 64);
	else
		azx_dev->delay_negative_threshold = 0;

	/* wallclk has 24Mhz clock source */
	azx_dev->period_wallclk = (((runtime->period_size * 24000) /
						runtime->rate) * 1000);
	azx_setup_controller(chip, azx_dev);
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		azx_dev->fifo_size =
			azx_sd_readw(chip, azx_dev, SD_FIFOSIZE) + 1;
	else
		azx_dev->fifo_size = 0;

	stream_tag = azx_dev->stream_tag;
	/* CA-IBG chips need the playback stream starting from 1 */
	if ((chip->driver_caps & AZX_DCAPS_CTX_WORKAROUND) &&
	    stream_tag > chip->capture_streams)
		stream_tag -= chip->capture_streams;
	err = snd_hda_codec_prepare(apcm->codec, hinfo, stream_tag,
				     azx_dev->format_val, substream);

 unlock:
	if (!err)
		azx_dev->prepared = 1;
	dsp_unlock(azx_dev);
	return err;
}

static int azx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
	struct azx *chip = apcm->chip;
	struct azx_dev *azx_dev;
	struct snd_pcm_substream *s;
	int rstart = 0, start, nsync = 0, sbits = 0;
	int nwait, timeout;

	azx_dev = get_azx_dev(substream);
	trace_azx_pcm_trigger(chip, azx_dev, cmd);

	if (dsp_is_locked(azx_dev) || !azx_dev->prepared)
		return -EPIPE;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		rstart = 1;
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	case SNDRV_PCM_TRIGGER_RESUME:
		start = 1;
		break;
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_STOP:
		start = 0;
		break;
	default:
		return -EINVAL;
	}

	snd_pcm_group_for_each_entry(s, substream) {
		if (s->pcm->card != substream->pcm->card)
			continue;
		azx_dev = get_azx_dev(s);
		sbits |= 1 << azx_dev->index;
		nsync++;
		snd_pcm_trigger_done(s, substream);
	}

	spin_lock(&chip->reg_lock);

	/* first, set SYNC bits of corresponding streams */
	if (chip->driver_caps & AZX_DCAPS_OLD_SSYNC)
		azx_writel(chip, OLD_SSYNC,
			azx_readl(chip, OLD_SSYNC) | sbits);
	else
		azx_writel(chip, SSYNC, azx_readl(chip, SSYNC) | sbits);

	snd_pcm_group_for_each_entry(s, substream) {
		if (s->pcm->card != substream->pcm->card)
			continue;
		azx_dev = get_azx_dev(s);
		if (start) {
			azx_dev->start_wallclk = azx_readl(chip, WALLCLK);
			if (!rstart)
				azx_dev->start_wallclk -=
						azx_dev->period_wallclk;
			azx_stream_start(chip, azx_dev);
		} else {
			azx_stream_stop(chip, azx_dev);
		}
		azx_dev->running = start;
	}
	spin_unlock(&chip->reg_lock);
	if (start) {
		/* wait until all FIFOs get ready */
		for (timeout = 5000; timeout; timeout--) {
			nwait = 0;
			snd_pcm_group_for_each_entry(s, substream) {
				if (s->pcm->card != substream->pcm->card)
					continue;
				azx_dev = get_azx_dev(s);
				if (!(azx_sd_readb(chip, azx_dev, SD_STS) &
				      SD_STS_FIFO_READY))
					nwait++;
			}
			if (!nwait)
				break;
			cpu_relax();
		}
	} else {
		/* wait until all RUN bits are cleared */
		for (timeout = 5000; timeout; timeout--) {
			nwait = 0;
			snd_pcm_group_for_each_entry(s, substream) {
				if (s->pcm->card != substream->pcm->card)
					continue;
				azx_dev = get_azx_dev(s);
				if (azx_sd_readb(chip, azx_dev, SD_CTL) &
				    SD_CTL_DMA_START)
					nwait++;
			}
			if (!nwait)
				break;
			cpu_relax();
		}
	}
	spin_lock(&chip->reg_lock);
	/* reset SYNC bits */
	if (chip->driver_caps & AZX_DCAPS_OLD_SSYNC)
		azx_writel(chip, OLD_SSYNC,
			azx_readl(chip, OLD_SSYNC) & ~sbits);
	else
		azx_writel(chip, SSYNC, azx_readl(chip, SSYNC) & ~sbits);
	if (start) {
		azx_timecounter_init(substream, 0, 0);
		if (nsync > 1) {
			cycle_t cycle_last;

			/* same start cycle for master and group */
			azx_dev = get_azx_dev(substream);
			cycle_last = azx_dev->azx_tc.cycle_last;

			snd_pcm_group_for_each_entry(s, substream) {
				if (s->pcm->card != substream->pcm->card)
					continue;
				azx_timecounter_init(s, 1, cycle_last);
			}
		}
	}
	spin_unlock(&chip->reg_lock);
	return 0;
}

/* get the current DMA position with correction on VIA chips */
static unsigned int azx_via_get_position(struct azx *chip,
					 struct azx_dev *azx_dev)
{
	unsigned int link_pos, mini_pos, bound_pos;
	unsigned int mod_link_pos, mod_dma_pos, mod_mini_pos;
	unsigned int fifo_size;

	link_pos = azx_sd_readl(chip, azx_dev, SD_LPIB);
	if (azx_dev->substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		/* Playback, no problem using link position */
		return link_pos;
	}

	/* Capture */
	/* For new chipset,
	 * use mod to get the DMA position just like old chipset
	 */
	mod_dma_pos = le32_to_cpu(*azx_dev->posbuf);
	mod_dma_pos %= azx_dev->period_bytes;

	/* azx_dev->fifo_size can't get FIFO size of in stream.
	 * Get from base address + offset.
	 */
	fifo_size = readw(chip->remap_addr + VIA_IN_STREAM0_FIFO_SIZE_OFFSET);

	if (azx_dev->insufficient) {
		/* Link position never gather than FIFO size */
		if (link_pos <= fifo_size)
			return 0;

		azx_dev->insufficient = 0;
	}

	if (link_pos <= fifo_size)
		mini_pos = azx_dev->bufsize + link_pos - fifo_size;
	else
		mini_pos = link_pos - fifo_size;

	/* Find nearest previous boudary */
	mod_mini_pos = mini_pos % azx_dev->period_bytes;
	mod_link_pos = link_pos % azx_dev->period_bytes;
	if (mod_link_pos >= fifo_size)
		bound_pos = link_pos - mod_link_pos;
	else if (mod_dma_pos >= mod_mini_pos)
		bound_pos = mini_pos - mod_mini_pos;
	else {
		bound_pos = mini_pos - mod_mini_pos + azx_dev->period_bytes;
		if (bound_pos >= azx_dev->bufsize)
			bound_pos = 0;
	}

	/* Calculate real DMA position we want */
	return bound_pos + mod_dma_pos;
}

static unsigned int azx_get_position(struct azx *chip,
				     struct azx_dev *azx_dev,
				     bool with_check)
{
	struct snd_pcm_substream *substream = azx_dev->substream;
	struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
	unsigned int pos;
	int stream = substream->stream;
	struct hda_pcm_stream *hinfo = apcm->hinfo[stream];
	int delay = 0;

	switch (chip->position_fix[stream]) {
	case POS_FIX_LPIB:
		/* read LPIB */
		pos = azx_sd_readl(chip, azx_dev, SD_LPIB);
		break;
	case POS_FIX_VIACOMBO:
		pos = azx_via_get_position(chip, azx_dev);
		break;
	default:
		/* use the position buffer */
		pos = le32_to_cpu(*azx_dev->posbuf);
		if (with_check && chip->position_fix[stream] == POS_FIX_AUTO) {
			if (!pos || pos == (u32)-1) {
				dev_info(chip->card->dev,
					 "Invalid position buffer, using LPIB read method instead.\n");
				chip->position_fix[stream] = POS_FIX_LPIB;
				pos = azx_sd_readl(chip, azx_dev, SD_LPIB);
			} else
				chip->position_fix[stream] = POS_FIX_POSBUF;
		}
		break;
	}

	if (pos >= azx_dev->bufsize)
		pos = 0;

	/* calculate runtime delay from LPIB */
	if (substream->runtime &&
	    chip->position_fix[stream] == POS_FIX_POSBUF &&
	    (chip->driver_caps & AZX_DCAPS_COUNT_LPIB_DELAY)) {
		unsigned int lpib_pos = azx_sd_readl(chip, azx_dev, SD_LPIB);
		if (stream == SNDRV_PCM_STREAM_PLAYBACK)
			delay = pos - lpib_pos;
		else
			delay = lpib_pos - pos;
		if (delay < 0) {
			if (delay >= azx_dev->delay_negative_threshold)
				delay = 0;
			else
				delay += azx_dev->bufsize;
		}
		if (delay >= azx_dev->period_bytes) {
			dev_info(chip->card->dev,
				 "Unstable LPIB (%d >= %d); disabling LPIB delay counting\n",
				 delay, azx_dev->period_bytes);
			delay = 0;
			chip->driver_caps &= ~AZX_DCAPS_COUNT_LPIB_DELAY;
		}
		delay = bytes_to_frames(substream->runtime, delay);
	}

	if (substream->runtime) {
		if (hinfo->ops.get_delay)
			delay += hinfo->ops.get_delay(hinfo, apcm->codec,
						      substream);
		substream->runtime->delay = delay;
	}

	trace_azx_get_position(chip, azx_dev, pos, delay);
	return pos;
}

static snd_pcm_uframes_t azx_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
	struct azx *chip = apcm->chip;
	struct azx_dev *azx_dev = get_azx_dev(substream);
	return bytes_to_frames(substream->runtime,
			       azx_get_position(chip, azx_dev, false));
}

/*
 * Check whether the current DMA position is acceptable for updating
 * periods.  Returns non-zero if it's OK.
 *
 * Many HD-audio controllers appear pretty inaccurate about
 * the update-IRQ timing.  The IRQ is issued before actually the
 * data is processed.  So, we need to process it afterwords in a
 * workqueue.
 */
static int azx_position_ok(struct azx *chip, struct azx_dev *azx_dev)
{
	u32 wallclk;
	unsigned int pos;

	wallclk = azx_readl(chip, WALLCLK) - azx_dev->start_wallclk;
	if (wallclk < (azx_dev->period_wallclk * 2) / 3)
		return -1;	/* bogus (too early) interrupt */

	pos = azx_get_position(chip, azx_dev, true);

	if (WARN_ONCE(!azx_dev->period_bytes,
		      "hda-intel: zero azx_dev->period_bytes"))
		return -1; /* this shouldn't happen! */
	if (wallclk < (azx_dev->period_wallclk * 5) / 4 &&
	    pos % azx_dev->period_bytes > azx_dev->period_bytes / 2)
		/* NG - it's below the first next period boundary */
		return chip->bdl_pos_adj[chip->dev_index] ? 0 : -1;
	azx_dev->start_wallclk += wallclk;
	return 1; /* OK, it's fine */
}

/*
 * The work for pending PCM period updates.
 */
static void azx_irq_pending_work(struct work_struct *work)
{
	struct azx *chip = container_of(work, struct azx, irq_pending_work);
	int i, pending, ok;

	if (!chip->irq_pending_warned) {
		dev_info(chip->card->dev,
			 "IRQ timing workaround is activated for card #%d. Suggest a bigger bdl_pos_adj.\n",
			 chip->card->number);
		chip->irq_pending_warned = 1;
	}

	for (;;) {
		pending = 0;
		spin_lock_irq(&chip->reg_lock);
		for (i = 0; i < chip->num_streams; i++) {
			struct azx_dev *azx_dev = &chip->azx_dev[i];
			if (!azx_dev->irq_pending ||
			    !azx_dev->substream ||
			    !azx_dev->running)
				continue;
			ok = azx_position_ok(chip, azx_dev);
			if (ok > 0) {
				azx_dev->irq_pending = 0;
				spin_unlock(&chip->reg_lock);
				snd_pcm_period_elapsed(azx_dev->substream);
				spin_lock(&chip->reg_lock);
			} else if (ok < 0) {
				pending = 0;	/* too early */
			} else
				pending++;
		}
		spin_unlock_irq(&chip->reg_lock);
		if (!pending)
			return;
		msleep(1);
	}
}

/* clear irq_pending flags and assure no on-going workq */
static void azx_clear_irq_pending(struct azx *chip)
{
	int i;

	spin_lock_irq(&chip->reg_lock);
	for (i = 0; i < chip->num_streams; i++)
		chip->azx_dev[i].irq_pending = 0;
	spin_unlock_irq(&chip->reg_lock);
}

#ifdef CONFIG_X86
static int azx_pcm_mmap(struct snd_pcm_substream *substream,
			struct vm_area_struct *area)
{
	struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
	struct azx *chip = apcm->chip;
	if (!azx_snoop(chip))
		area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
	return snd_pcm_lib_default_mmap(substream, area);
}
#else
#define azx_pcm_mmap	NULL
#endif

static struct snd_pcm_ops azx_pcm_ops = {
	.open = azx_pcm_open,
	.close = azx_pcm_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = azx_pcm_hw_params,
	.hw_free = azx_pcm_hw_free,
	.prepare = azx_pcm_prepare,
	.trigger = azx_pcm_trigger,
	.pointer = azx_pcm_pointer,
	.wall_clock =  azx_get_wallclock_tstamp,
	.mmap = azx_pcm_mmap,
	.page = snd_pcm_sgbuf_ops_page,
};

static void azx_pcm_free(struct snd_pcm *pcm)
{
	struct azx_pcm *apcm = pcm->private_data;
	if (apcm) {
		list_del(&apcm->list);
		kfree(apcm);
	}
}

#define MAX_PREALLOC_SIZE	(32 * 1024 * 1024)

static int
azx_attach_pcm_stream(struct hda_bus *bus, struct hda_codec *codec,
		      struct hda_pcm *cpcm)
{
	struct azx *chip = bus->private_data;
	struct snd_pcm *pcm;
	struct azx_pcm *apcm;
	int pcm_dev = cpcm->device;
	unsigned int size;
	int s, err;

	list_for_each_entry(apcm, &chip->pcm_list, list) {
		if (apcm->pcm->device == pcm_dev) {
			dev_err(chip->card->dev, "PCM %d already exists\n",
				pcm_dev);
			return -EBUSY;
		}
	}
	err = snd_pcm_new(chip->card, cpcm->name, pcm_dev,
			  cpcm->stream[SNDRV_PCM_STREAM_PLAYBACK].substreams,
			  cpcm->stream[SNDRV_PCM_STREAM_CAPTURE].substreams,
			  &pcm);
	if (err < 0)
		return err;
	strlcpy(pcm->name, cpcm->name, sizeof(pcm->name));
	apcm = kzalloc(sizeof(*apcm), GFP_KERNEL);
	if (apcm == NULL)
		return -ENOMEM;
	apcm->chip = chip;
	apcm->pcm = pcm;
	apcm->codec = codec;
	pcm->private_data = apcm;
	pcm->private_free = azx_pcm_free;
	if (cpcm->pcm_type == HDA_PCM_TYPE_MODEM)
		pcm->dev_class = SNDRV_PCM_CLASS_MODEM;
	list_add_tail(&apcm->list, &chip->pcm_list);
	cpcm->pcm = pcm;
	for (s = 0; s < 2; s++) {
		apcm->hinfo[s] = &cpcm->stream[s];
		if (cpcm->stream[s].substreams)
			snd_pcm_set_ops(pcm, s, &azx_pcm_ops);
	}
	/* buffer pre-allocation */
	size = CONFIG_SND_HDA_PREALLOC_SIZE * 1024;
	if (size > MAX_PREALLOC_SIZE)
		size = MAX_PREALLOC_SIZE;
	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
					      chip->card->dev,
					      size, MAX_PREALLOC_SIZE);
	/* link to codec */
	pcm->dev = &codec->dev;
	return 0;
}

/*
 * mixer creation - all stuff is implemented in hda module
 */
static int azx_mixer_create(struct azx *chip)
{
	return snd_hda_build_controls(chip->bus);
}


/*
 * initialize SD streams
 */
static int azx_init_stream(struct azx *chip)
{
	int i;

	/* initialize each stream (aka device)
	 * assign the starting bdl address to each stream (device)
	 * and initialize
	 */
	for (i = 0; i < chip->num_streams; i++) {
		struct azx_dev *azx_dev = &chip->azx_dev[i];
		azx_dev->posbuf = (u32 __iomem *)(chip->posbuf.area + i * 8);
		/* offset: SDI0=0x80, SDI1=0xa0, ... SDO3=0x160 */
		azx_dev->sd_addr = chip->remap_addr + (0x20 * i + 0x80);
		/* int mask: SDI0=0x01, SDI1=0x02, ... SDO3=0x80 */
		azx_dev->sd_int_sta_mask = 1 << i;
		/* stream tag: must be non-zero and unique */
		azx_dev->index = i;
		azx_dev->stream_tag = i + 1;
	}

	return 0;
}

static int azx_acquire_irq(struct azx *chip, int do_disconnect)
{
	if (request_irq(chip->pci->irq, azx_interrupt,
			chip->msi ? 0 : IRQF_SHARED,
			KBUILD_MODNAME, chip)) {
		dev_err(chip->card->dev,
			"unable to grab IRQ %d, disabling device\n",
			chip->pci->irq);
		if (do_disconnect)
			snd_card_disconnect(chip->card);
		return -1;
	}
	chip->irq = chip->pci->irq;
	pci_intx(chip->pci, !chip->msi);
	return 0;
}


static void azx_stop_chip(struct azx *chip)
{
	if (!chip->initialized)
		return;

	/* disable interrupts */
	azx_int_disable(chip);
	azx_int_clear(chip);

	/* disable CORB/RIRB */
	azx_free_cmd_io(chip);

	/* disable position buffer */
	azx_writel(chip, DPLBASE, 0);
	azx_writel(chip, DPUBASE, 0);

	chip->initialized = 0;
}

#ifdef CONFIG_SND_HDA_DSP_LOADER
/*
 * DSP loading code (e.g. for CA0132)
 */

/* use the first stream for loading DSP */
static struct azx_dev *
azx_get_dsp_loader_dev(struct azx *chip)
{
	return &chip->azx_dev[chip->playback_index_offset];
}

static int azx_load_dsp_prepare(struct hda_bus *bus, unsigned int format,
				unsigned int byte_size,
				struct snd_dma_buffer *bufp)
{
	u32 *bdl;
	struct azx *chip = bus->private_data;
	struct azx_dev *azx_dev;
	int err;

	azx_dev = azx_get_dsp_loader_dev(chip);

	dsp_lock(azx_dev);
	spin_lock_irq(&chip->reg_lock);
	if (azx_dev->running || azx_dev->locked) {
		spin_unlock_irq(&chip->reg_lock);
		err = -EBUSY;
		goto unlock;
	}
	azx_dev->prepared = 0;
	chip->saved_azx_dev = *azx_dev;
	azx_dev->locked = 1;
	spin_unlock_irq(&chip->reg_lock);

	err = chip->ops->dma_alloc_pages(chip, SNDRV_DMA_TYPE_DEV_SG,
					 byte_size, bufp);
	if (err < 0)
		goto err_alloc;

	azx_dev->bufsize = byte_size;
	azx_dev->period_bytes = byte_size;
	azx_dev->format_val = format;

	azx_stream_reset(chip, azx_dev);

	/* reset BDL address */
	azx_sd_writel(chip, azx_dev, SD_BDLPL, 0);
	azx_sd_writel(chip, azx_dev, SD_BDLPU, 0);

	azx_dev->frags = 0;
	bdl = (u32 *)azx_dev->bdl.area;
	err = setup_bdle(chip, bufp, azx_dev, &bdl, 0, byte_size, 0);
	if (err < 0)
		goto error;

	azx_setup_controller(chip, azx_dev);
	dsp_unlock(azx_dev);
	return azx_dev->stream_tag;

 error:
	chip->ops->dma_free_pages(chip, bufp);
 err_alloc:
	spin_lock_irq(&chip->reg_lock);
	if (azx_dev->opened)
		*azx_dev = chip->saved_azx_dev;
	azx_dev->locked = 0;
	spin_unlock_irq(&chip->reg_lock);
 unlock:
	dsp_unlock(azx_dev);
	return err;
}

static void azx_load_dsp_trigger(struct hda_bus *bus, bool start)
{
	struct azx *chip = bus->private_data;
	struct azx_dev *azx_dev = azx_get_dsp_loader_dev(chip);

	if (start)
		azx_stream_start(chip, azx_dev);
	else
		azx_stream_stop(chip, azx_dev);
	azx_dev->running = start;
}

static void azx_load_dsp_cleanup(struct hda_bus *bus,
				 struct snd_dma_buffer *dmab)
{
	struct azx *chip = bus->private_data;
	struct azx_dev *azx_dev = azx_get_dsp_loader_dev(chip);

	if (!dmab->area || !azx_dev->locked)
		return;

	dsp_lock(azx_dev);
	/* reset BDL address */
	azx_sd_writel(chip, azx_dev, SD_BDLPL, 0);
	azx_sd_writel(chip, azx_dev, SD_BDLPU, 0);
	azx_sd_writel(chip, azx_dev, SD_CTL, 0);
	azx_dev->bufsize = 0;
	azx_dev->period_bytes = 0;
	azx_dev->format_val = 0;

	chip->ops->dma_free_pages(chip, dmab);
	dmab->area = NULL;

	spin_lock_irq(&chip->reg_lock);
	if (azx_dev->opened)
		*azx_dev = chip->saved_azx_dev;
	azx_dev->locked = 0;
	spin_unlock_irq(&chip->reg_lock);
	dsp_unlock(azx_dev);
}
#endif /* CONFIG_SND_HDA_DSP_LOADER */

#ifdef CONFIG_PM
/* power-up/down the controller */
static void azx_power_notify(struct hda_bus *bus, bool power_up)
{
	struct azx *chip = bus->private_data;

	if (!(chip->driver_caps & AZX_DCAPS_PM_RUNTIME))
		return;

	if (power_up)
		pm_runtime_get_sync(chip->card->dev);
	else
		pm_runtime_put_sync(chip->card->dev);
}

static DEFINE_MUTEX(card_list_lock);
static LIST_HEAD(card_list);

static void azx_add_card_list(struct azx *chip)
{
	mutex_lock(&card_list_lock);
	list_add(&chip->list, &card_list);
	mutex_unlock(&card_list_lock);
}

static void azx_del_card_list(struct azx *chip)
{
	mutex_lock(&card_list_lock);
	list_del_init(&chip->list);
	mutex_unlock(&card_list_lock);
}

/* trigger power-save check at writing parameter */
static int param_set_xint(const char *val, const struct kernel_param *kp)
{
	struct azx *chip;
	struct hda_codec *c;
	int prev = power_save;
	int ret = param_set_int(val, kp);

	if (ret || prev == power_save)
		return ret;

	mutex_lock(&card_list_lock);
	list_for_each_entry(chip, &card_list, list) {
		if (!chip->bus || chip->disabled)
			continue;
		list_for_each_entry(c, &chip->bus->codec_list, list)
			snd_hda_power_sync(c);
	}
	mutex_unlock(&card_list_lock);
	return 0;
}
#else
#define azx_add_card_list(chip) /* NOP */
#define azx_del_card_list(chip) /* NOP */
#endif /* CONFIG_PM */

#if defined(CONFIG_PM_SLEEP) || defined(SUPPORT_VGA_SWITCHEROO)
/*
 * power management
 */
static int azx_suspend(struct device *dev)
{
	struct pci_dev *pci = to_pci_dev(dev);
	struct snd_card *card = dev_get_drvdata(dev);
	struct azx *chip = card->private_data;
	struct azx_pcm *p;

	if (chip->disabled)
		return 0;

	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
	azx_clear_irq_pending(chip);
	list_for_each_entry(p, &chip->pcm_list, list)
		snd_pcm_suspend_all(p->pcm);
	if (chip->initialized)
		snd_hda_suspend(chip->bus);
	azx_stop_chip(chip);
	azx_enter_link_reset(chip);
	if (chip->irq >= 0) {
		free_irq(chip->irq, chip);
		chip->irq = -1;
	}
	if (chip->msi)
		pci_disable_msi(chip->pci);
	pci_disable_device(pci);
	pci_save_state(pci);
	pci_set_power_state(pci, PCI_D3hot);
	if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
		hda_display_power(false);
	return 0;
}

static int azx_resume(struct device *dev)
{
	struct pci_dev *pci = to_pci_dev(dev);
	struct snd_card *card = dev_get_drvdata(dev);
	struct azx *chip = card->private_data;

	if (chip->disabled)
		return 0;

	if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
		hda_display_power(true);
	pci_set_power_state(pci, PCI_D0);
	pci_restore_state(pci);
	if (pci_enable_device(pci) < 0) {
		dev_err(chip->card->dev,
			"pci_enable_device failed, disabling device\n");
		snd_card_disconnect(card);
		return -EIO;
	}
	pci_set_master(pci);
	if (chip->msi)
		if (pci_enable_msi(pci) < 0)
			chip->msi = 0;
	if (azx_acquire_irq(chip, 1) < 0)
		return -EIO;
	azx_init_pci(chip);

	azx_init_chip(chip, 1);

	snd_hda_resume(chip->bus);
	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
	return 0;
}
#endif /* CONFIG_PM_SLEEP || SUPPORT_VGA_SWITCHEROO */

#ifdef CONFIG_PM_RUNTIME
static int azx_runtime_suspend(struct device *dev)
{
	struct snd_card *card = dev_get_drvdata(dev);
	struct azx *chip = card->private_data;

	if (chip->disabled)
		return 0;

	if (!(chip->driver_caps & AZX_DCAPS_PM_RUNTIME))
		return 0;

	/* enable controller wake up event */
	azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) |
		  STATESTS_INT_MASK);

	azx_stop_chip(chip);
	azx_enter_link_reset(chip);
	azx_clear_irq_pending(chip);
	if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
		hda_display_power(false);
	return 0;
}

static int azx_runtime_resume(struct device *dev)
{
	struct snd_card *card = dev_get_drvdata(dev);
	struct azx *chip = card->private_data;
	struct hda_bus *bus;
	struct hda_codec *codec;
	int status;

	if (chip->disabled)
		return 0;

	if (!(chip->driver_caps & AZX_DCAPS_PM_RUNTIME))
		return 0;

	if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
		hda_display_power(true);

	/* Read STATESTS before controller reset */
	status = azx_readw(chip, STATESTS);

	azx_init_pci(chip);
	azx_init_chip(chip, 1);

	bus = chip->bus;
	if (status && bus) {
		list_for_each_entry(codec, &bus->codec_list, list)
			if (status & (1 << codec->addr))
				queue_delayed_work(codec->bus->workq,
						   &codec->jackpoll_work, codec->jackpoll_interval);
	}

	/* disable controller Wake Up event*/
	azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) &
			~STATESTS_INT_MASK);

	return 0;
}

static int azx_runtime_idle(struct device *dev)
{
	struct snd_card *card = dev_get_drvdata(dev);
	struct azx *chip = card->private_data;

	if (chip->disabled)
		return 0;

	if (!power_save_controller ||
	    !(chip->driver_caps & AZX_DCAPS_PM_RUNTIME))
		return -EBUSY;

	return 0;
}

#endif /* CONFIG_PM_RUNTIME */

#ifdef CONFIG_PM
static const struct dev_pm_ops azx_pm = {
	SET_SYSTEM_SLEEP_PM_OPS(azx_suspend, azx_resume)
	SET_RUNTIME_PM_OPS(azx_runtime_suspend, azx_runtime_resume, azx_runtime_idle)
};

#define AZX_PM_OPS	&azx_pm
#else
#define AZX_PM_OPS	NULL
#endif /* CONFIG_PM */


/*
 * reboot notifier for hang-up problem at power-down
 */
static int azx_halt(struct notifier_block *nb, unsigned long event, void *buf)
{
	struct azx *chip = container_of(nb, struct azx, reboot_notifier);
	snd_hda_bus_reboot_notify(chip->bus);
	azx_stop_chip(chip);
	return NOTIFY_OK;
}

static void azx_notifier_register(struct azx *chip)
{
	chip->reboot_notifier.notifier_call = azx_halt;
	register_reboot_notifier(&chip->reboot_notifier);
}

static void azx_notifier_unregister(struct azx *chip)
{
	if (chip->reboot_notifier.notifier_call)
		unregister_reboot_notifier(&chip->reboot_notifier);
}

static int azx_probe_continue(struct azx *chip);

#ifdef SUPPORT_VGA_SWITCHEROO
static struct pci_dev *get_bound_vga(struct pci_dev *pci);

static void azx_vs_set_state(struct pci_dev *pci,
			     enum vga_switcheroo_state state)
{
	struct snd_card *card = pci_get_drvdata(pci);
	struct azx *chip = card->private_data;
	bool disabled;

	wait_for_completion(&chip->probe_wait);
	if (chip->init_failed)
		return;

	disabled = (state == VGA_SWITCHEROO_OFF);
	if (chip->disabled == disabled)
		return;

	if (!chip->bus) {
		chip->disabled = disabled;
		if (!disabled) {
			dev_info(chip->card->dev,
				 "Start delayed initialization\n");
			if (azx_probe_continue(chip) < 0) {
				dev_err(chip->card->dev, "initialization error\n");
				chip->init_failed = true;
			}
		}
	} else {
		dev_info(chip->card->dev, "%s via VGA-switcheroo\n",
			 disabled ? "Disabling" : "Enabling");
		if (disabled) {
			pm_runtime_put_sync_suspend(card->dev);
			azx_suspend(card->dev);
			/* when we get suspended by vga switcheroo we end up in D3cold,
			 * however we have no ACPI handle, so pci/acpi can't put us there,
			 * put ourselves there */
			pci->current_state = PCI_D3cold;
			chip->disabled = true;
			if (snd_hda_lock_devices(chip->bus))
				dev_warn(chip->card->dev,
					 "Cannot lock devices!\n");
		} else {
			snd_hda_unlock_devices(chip->bus);
			pm_runtime_get_noresume(card->dev);
			chip->disabled = false;
			azx_resume(card->dev);
		}
	}
}

static bool azx_vs_can_switch(struct pci_dev *pci)
{
	struct snd_card *card = pci_get_drvdata(pci);
	struct azx *chip = card->private_data;

	wait_for_completion(&chip->probe_wait);
	if (chip->init_failed)
		return false;
	if (chip->disabled || !chip->bus)
		return true;
	if (snd_hda_lock_devices(chip->bus))
		return false;
	snd_hda_unlock_devices(chip->bus);
	return true;
}

static void init_vga_switcheroo(struct azx *chip)
{
	struct pci_dev *p = get_bound_vga(chip->pci);
	if (p) {
		dev_info(chip->card->dev,
			 "Handle VGA-switcheroo audio client\n");
		chip->use_vga_switcheroo = 1;
		pci_dev_put(p);
	}
}

static const struct vga_switcheroo_client_ops azx_vs_ops = {
	.set_gpu_state = azx_vs_set_state,
	.can_switch = azx_vs_can_switch,
};

static int register_vga_switcheroo(struct azx *chip)
{
	int err;

	if (!chip->use_vga_switcheroo)
		return 0;
	/* FIXME: currently only handling DIS controller
	 * is there any machine with two switchable HDMI audio controllers?
	 */
	err = vga_switcheroo_register_audio_client(chip->pci, &azx_vs_ops,
						    VGA_SWITCHEROO_DIS,
						    chip->bus != NULL);
	if (err < 0)
		return err;
	chip->vga_switcheroo_registered = 1;

	/* register as an optimus hdmi audio power domain */
	vga_switcheroo_init_domain_pm_optimus_hdmi_audio(chip->card->dev,
							 &chip->hdmi_pm_domain);
	return 0;
}
#else
#define init_vga_switcheroo(chip)		/* NOP */
#define register_vga_switcheroo(chip)		0
#define check_hdmi_disabled(pci)	false
#endif /* SUPPORT_VGA_SWITCHER */

/*
 * destructor
 */
static int azx_free(struct azx *chip)
{
	struct pci_dev *pci = chip->pci;
	int i;

	if ((chip->driver_caps & AZX_DCAPS_PM_RUNTIME)
			&& chip->running)
		pm_runtime_get_noresume(&pci->dev);

	azx_del_card_list(chip);

	azx_notifier_unregister(chip);

	chip->init_failed = 1; /* to be sure */
	complete_all(&chip->probe_wait);

	if (use_vga_switcheroo(chip)) {
		if (chip->disabled && chip->bus)
			snd_hda_unlock_devices(chip->bus);
		if (chip->vga_switcheroo_registered)
			vga_switcheroo_unregister_client(chip->pci);
	}

	if (chip->initialized) {
		azx_clear_irq_pending(chip);
		for (i = 0; i < chip->num_streams; i++)
			azx_stream_stop(chip, &chip->azx_dev[i]);
		azx_stop_chip(chip);
	}

	if (chip->irq >= 0)
		free_irq(chip->irq, (void*)chip);
	if (chip->msi)
		pci_disable_msi(chip->pci);
	if (chip->remap_addr)
		iounmap(chip->remap_addr);

	if (chip->azx_dev) {
		for (i = 0; i < chip->num_streams; i++)
			if (chip->azx_dev[i].bdl.area)
				chip->ops->dma_free_pages(
					chip, &chip->azx_dev[i].bdl);
	}
	if (chip->rb.area)
		chip->ops->dma_free_pages(chip, &chip->rb);
	if (chip->posbuf.area)
		chip->ops->dma_free_pages(chip, &chip->posbuf);
	if (chip->region_requested)
		pci_release_regions(chip->pci);
	pci_disable_device(chip->pci);
	kfree(chip->azx_dev);
#ifdef CONFIG_SND_HDA_PATCH_LOADER
	if (chip->fw)
		release_firmware(chip->fw);
#endif
	if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {
		hda_display_power(false);
		hda_i915_exit();
	}
	kfree(chip);

	return 0;
}

static int azx_dev_free(struct snd_device *device)
{
	return azx_free(device->device_data);
}

#ifdef SUPPORT_VGA_SWITCHEROO
/*
 * Check of disabled HDMI controller by vga-switcheroo
 */
static struct pci_dev *get_bound_vga(struct pci_dev *pci)
{
	struct pci_dev *p;

	/* check only discrete GPU */
	switch (pci->vendor) {
	case PCI_VENDOR_ID_ATI:
	case PCI_VENDOR_ID_AMD:
	case PCI_VENDOR_ID_NVIDIA:
		if (pci->devfn == 1) {
			p = pci_get_domain_bus_and_slot(pci_domain_nr(pci->bus),
							pci->bus->number, 0);
			if (p) {
				if ((p->class >> 8) == PCI_CLASS_DISPLAY_VGA)
					return p;
				pci_dev_put(p);
			}
		}
		break;
	}
	return NULL;
}

static bool check_hdmi_disabled(struct pci_dev *pci)
{
	bool vga_inactive = false;
	struct pci_dev *p = get_bound_vga(pci);

	if (p) {
		if (vga_switcheroo_get_client_state(p) == VGA_SWITCHEROO_OFF)
			vga_inactive = true;
		pci_dev_put(p);
	}
	return vga_inactive;
}
#endif /* SUPPORT_VGA_SWITCHEROO */

/*
 * white/black-listing for position_fix
 */
static struct snd_pci_quirk position_fix_list[] = {
	SND_PCI_QUIRK(0x1028, 0x01cc, "Dell D820", POS_FIX_LPIB),
	SND_PCI_QUIRK(0x1028, 0x01de, "Dell Precision 390", POS_FIX_LPIB),
	SND_PCI_QUIRK(0x103c, 0x306d, "HP dv3", POS_FIX_LPIB),
	SND_PCI_QUIRK(0x1043, 0x813d, "ASUS P5AD2", POS_FIX_LPIB),
	SND_PCI_QUIRK(0x1043, 0x81b3, "ASUS", POS_FIX_LPIB),
	SND_PCI_QUIRK(0x1043, 0x81e7, "ASUS M2V", POS_FIX_LPIB),
	SND_PCI_QUIRK(0x104d, 0x9069, "Sony VPCS11V9E", POS_FIX_LPIB),
	SND_PCI_QUIRK(0x10de, 0xcb89, "Macbook Pro 7,1", POS_FIX_LPIB),
	SND_PCI_QUIRK(0x1297, 0x3166, "Shuttle", POS_FIX_LPIB),
	SND_PCI_QUIRK(0x1458, 0xa022, "ga-ma770-ud3", POS_FIX_LPIB),
	SND_PCI_QUIRK(0x1462, 0x1002, "MSI Wind U115", POS_FIX_LPIB),
	SND_PCI_QUIRK(0x1565, 0x8218, "Biostar Microtech", POS_FIX_LPIB),
	SND_PCI_QUIRK(0x1849, 0x0888, "775Dual-VSTA", POS_FIX_LPIB),
	SND_PCI_QUIRK(0x8086, 0x2503, "DG965OT AAD63733-203", POS_FIX_LPIB),
	{}
};

static int check_position_fix(struct azx *chip, int fix)
{
	const struct snd_pci_quirk *q;

	switch (fix) {
	case POS_FIX_AUTO:
	case POS_FIX_LPIB:
	case POS_FIX_POSBUF:
	case POS_FIX_VIACOMBO:
	case POS_FIX_COMBO:
		return fix;
	}

	q = snd_pci_quirk_lookup(chip->pci, position_fix_list);
	if (q) {
		dev_info(chip->card->dev,
			 "position_fix set to %d for device %04x:%04x\n",
			 q->value, q->subvendor, q->subdevice);
		return q->value;
	}

	/* Check VIA/ATI HD Audio Controller exist */
	if (chip->driver_caps & AZX_DCAPS_POSFIX_VIA) {
		dev_dbg(chip->card->dev, "Using VIACOMBO position fix\n");
		return POS_FIX_VIACOMBO;
	}
	if (chip->driver_caps & AZX_DCAPS_POSFIX_LPIB) {
		dev_dbg(chip->card->dev, "Using LPIB position fix\n");
		return POS_FIX_LPIB;
	}
	return POS_FIX_AUTO;
}

/*
 * black-lists for probe_mask
 */
static struct snd_pci_quirk probe_mask_list[] = {
	/* Thinkpad often breaks the controller communication when accessing
	 * to the non-working (or non-existing) modem codec slot.
	 */
	SND_PCI_QUIRK(0x1014, 0x05b7, "Thinkpad Z60", 0x01),
	SND_PCI_QUIRK(0x17aa, 0x2010, "Thinkpad X/T/R60", 0x01),
	SND_PCI_QUIRK(0x17aa, 0x20ac, "Thinkpad X/T/R61", 0x01),
	/* broken BIOS */
	SND_PCI_QUIRK(0x1028, 0x20ac, "Dell Studio Desktop", 0x01),
	/* including bogus ALC268 in slot#2 that conflicts with ALC888 */
	SND_PCI_QUIRK(0x17c0, 0x4085, "Medion MD96630", 0x01),
	/* forced codec slots */
	SND_PCI_QUIRK(0x1043, 0x1262, "ASUS W5Fm", 0x103),
	SND_PCI_QUIRK(0x1046, 0x1262, "ASUS W5F", 0x103),
	/* WinFast VP200 H (Teradici) user reported broken communication */
	SND_PCI_QUIRK(0x3a21, 0x040d, "WinFast VP200 H", 0x101),
	{}
};

#define AZX_FORCE_CODEC_MASK	0x100

static void check_probe_mask(struct azx *chip, int dev)
{
	const struct snd_pci_quirk *q;

	chip->codec_probe_mask = probe_mask[dev];
	if (chip->codec_probe_mask == -1) {
		q = snd_pci_quirk_lookup(chip->pci, probe_mask_list);
		if (q) {
			dev_info(chip->card->dev,
				 "probe_mask set to 0x%x for device %04x:%04x\n",
				 q->value, q->subvendor, q->subdevice);
			chip->codec_probe_mask = q->value;
		}
	}

	/* check forced option */
	if (chip->codec_probe_mask != -1 &&
	    (chip->codec_probe_mask & AZX_FORCE_CODEC_MASK)) {
		chip->codec_mask = chip->codec_probe_mask & 0xff;
		dev_info(chip->card->dev, "codec_mask forced to 0x%x\n",
			 chip->codec_mask);
	}
}

/*
 * white/black-list for enable_msi
 */
static struct snd_pci_quirk msi_black_list[] = {
	SND_PCI_QUIRK(0x103c, 0x2191, "HP", 0), /* AMD Hudson */
	SND_PCI_QUIRK(0x103c, 0x2192, "HP", 0), /* AMD Hudson */
	SND_PCI_QUIRK(0x103c, 0x21f7, "HP", 0), /* AMD Hudson */
	SND_PCI_QUIRK(0x103c, 0x21fa, "HP", 0), /* AMD Hudson */
	SND_PCI_QUIRK(0x1043, 0x81f2, "ASUS", 0), /* Athlon64 X2 + nvidia */
	SND_PCI_QUIRK(0x1043, 0x81f6, "ASUS", 0), /* nvidia */
	SND_PCI_QUIRK(0x1043, 0x822d, "ASUS", 0), /* Athlon64 X2 + nvidia MCP55 */
	SND_PCI_QUIRK(0x1179, 0xfb44, "Toshiba Satellite C870", 0), /* AMD Hudson */
	SND_PCI_QUIRK(0x1849, 0x0888, "ASRock", 0), /* Athlon64 X2 + nvidia */
	SND_PCI_QUIRK(0xa0a0, 0x0575, "Aopen MZ915-M", 0), /* ICH6 */
	{}
};

static void check_msi(struct azx *chip)
{
	const struct snd_pci_quirk *q;

	if (enable_msi >= 0) {
		chip->msi = !!enable_msi;
		return;
	}
	chip->msi = 1;	/* enable MSI as default */
	q = snd_pci_quirk_lookup(chip->pci, msi_black_list);
	if (q) {
		dev_info(chip->card->dev,
			 "msi for device %04x:%04x set to %d\n",
			 q->subvendor, q->subdevice, q->value);
		chip->msi = q->value;
		return;
	}

	/* NVidia chipsets seem to cause troubles with MSI */
	if (chip->driver_caps & AZX_DCAPS_NO_MSI) {
		dev_info(chip->card->dev, "Disabling MSI\n");
		chip->msi = 0;
	}
}

/* check the snoop mode availability */
static void azx_check_snoop_available(struct azx *chip)
{
	bool snoop = chip->snoop;

	switch (chip->driver_type) {
	case AZX_DRIVER_VIA:
		/* force to non-snoop mode for a new VIA controller
		 * when BIOS is set
		 */
		if (snoop) {
			u8 val;
			pci_read_config_byte(chip->pci, 0x42, &val);
			if (!(val & 0x80) && chip->pci->revision == 0x30)
				snoop = false;
		}
		break;
	case AZX_DRIVER_ATIHDMI_NS:
		/* new ATI HDMI requires non-snoop */
		snoop = false;
		break;
	case AZX_DRIVER_CTHDA:
		snoop = false;
		break;
	}

	if (snoop != chip->snoop) {
		dev_info(chip->card->dev, "Force to %s mode\n",
			 snoop ? "snoop" : "non-snoop");
		chip->snoop = snoop;
	}
}

static void azx_probe_work(struct work_struct *work)
{
	azx_probe_continue(container_of(work, struct azx, probe_work));
}

/*
 * constructor
 */
static int azx_create(struct snd_card *card, struct pci_dev *pci,
		      int dev, unsigned int driver_caps,
		      const struct hda_controller_ops *hda_ops,
		      struct azx **rchip)
{
	static struct snd_device_ops ops = {
		.dev_free = azx_dev_free,
	};
	struct azx *chip;
	int err;

	*rchip = NULL;

	err = pci_enable_device(pci);
	if (err < 0)
		return err;

	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	if (!chip) {
		dev_err(card->dev, "Cannot allocate chip\n");
		pci_disable_device(pci);
		return -ENOMEM;
	}

	spin_lock_init(&chip->reg_lock);
	mutex_init(&chip->open_mutex);
	chip->card = card;
	chip->pci = pci;
	chip->ops = hda_ops;
	chip->irq = -1;
	chip->driver_caps = driver_caps;
	chip->driver_type = driver_caps & 0xff;
	check_msi(chip);
	chip->dev_index = dev;
	chip->jackpoll_ms = jackpoll_ms;
	INIT_WORK(&chip->irq_pending_work, azx_irq_pending_work);
	INIT_LIST_HEAD(&chip->pcm_list);
	INIT_LIST_HEAD(&chip->list);
	init_vga_switcheroo(chip);
	init_completion(&chip->probe_wait);

	chip->position_fix[0] = chip->position_fix[1] =
		check_position_fix(chip, position_fix[dev]);
	/* combo mode uses LPIB for playback */
	if (chip->position_fix[0] == POS_FIX_COMBO) {
		chip->position_fix[0] = POS_FIX_LPIB;
		chip->position_fix[1] = POS_FIX_AUTO;
	}

	check_probe_mask(chip, dev);

	chip->single_cmd = single_cmd;
	chip->snoop = hda_snoop;
	azx_check_snoop_available(chip);

	if (bdl_pos_adj[dev] < 0) {
		switch (chip->driver_type) {
		case AZX_DRIVER_ICH:
		case AZX_DRIVER_PCH:
			bdl_pos_adj[dev] = 1;
			break;
		default:
			bdl_pos_adj[dev] = 32;
			break;
		}
	}
	chip->bdl_pos_adj = bdl_pos_adj;

	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
	if (err < 0) {
		dev_err(card->dev, "Error creating device [card]!\n");
		azx_free(chip);
		return err;
	}

	/* continue probing in work context as may trigger request module */
	INIT_WORK(&chip->probe_work, azx_probe_work);

	*rchip = chip;

	return 0;
}

static int azx_first_init(struct azx *chip)
{
	int dev = chip->dev_index;
	struct pci_dev *pci = chip->pci;
	struct snd_card *card = chip->card;
	int i, err;
	unsigned short gcap;

#if BITS_PER_LONG != 64
	/* Fix up base address on ULI M5461 */
	if (chip->driver_type == AZX_DRIVER_ULI) {
		u16 tmp3;
		pci_read_config_word(pci, 0x40, &tmp3);
		pci_write_config_word(pci, 0x40, tmp3 | 0x10);
		pci_write_config_dword(pci, PCI_BASE_ADDRESS_1, 0);
	}
#endif

	err = pci_request_regions(pci, "ICH HD audio");
	if (err < 0)
		return err;
	chip->region_requested = 1;

	chip->addr = pci_resource_start(pci, 0);
	chip->remap_addr = pci_ioremap_bar(pci, 0);
	if (chip->remap_addr == NULL) {
		dev_err(card->dev, "ioremap error\n");
		return -ENXIO;
	}

	if (chip->msi)
		if (pci_enable_msi(pci) < 0)
			chip->msi = 0;

	if (azx_acquire_irq(chip, 0) < 0)
		return -EBUSY;

	pci_set_master(pci);
	synchronize_irq(chip->irq);

	gcap = azx_readw(chip, GCAP);
	dev_dbg(card->dev, "chipset global capabilities = 0x%x\n", gcap);

	/* disable SB600 64bit support for safety */
	if (chip->pci->vendor == PCI_VENDOR_ID_ATI) {
		struct pci_dev *p_smbus;
		p_smbus = pci_get_device(PCI_VENDOR_ID_ATI,
					 PCI_DEVICE_ID_ATI_SBX00_SMBUS,
					 NULL);
		if (p_smbus) {
			if (p_smbus->revision < 0x30)
				gcap &= ~ICH6_GCAP_64OK;
			pci_dev_put(p_smbus);
		}
	}

	/* disable 64bit DMA address on some devices */
	if (chip->driver_caps & AZX_DCAPS_NO_64BIT) {
		dev_dbg(card->dev, "Disabling 64bit DMA\n");
		gcap &= ~ICH6_GCAP_64OK;
	}

	/* disable buffer size rounding to 128-byte multiples if supported */
	if (align_buffer_size >= 0)
		chip->align_buffer_size = !!align_buffer_size;
	else {
		if (chip->driver_caps & AZX_DCAPS_BUFSIZE)
			chip->align_buffer_size = 0;
		else if (chip->driver_caps & AZX_DCAPS_ALIGN_BUFSIZE)
			chip->align_buffer_size = 1;
		else
			chip->align_buffer_size = 1;
	}

	/* allow 64bit DMA address if supported by H/W */
	if ((gcap & ICH6_GCAP_64OK) && !pci_set_dma_mask(pci, DMA_BIT_MASK(64)))
		pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(64));
	else {
		pci_set_dma_mask(pci, DMA_BIT_MASK(32));
		pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(32));
	}

	/* read number of streams from GCAP register instead of using
	 * hardcoded value
	 */
	chip->capture_streams = (gcap >> 8) & 0x0f;
	chip->playback_streams = (gcap >> 12) & 0x0f;
	if (!chip->playback_streams && !chip->capture_streams) {
		/* gcap didn't give any info, switching to old method */

		switch (chip->driver_type) {
		case AZX_DRIVER_ULI:
			chip->playback_streams = ULI_NUM_PLAYBACK;
			chip->capture_streams = ULI_NUM_CAPTURE;
			break;
		case AZX_DRIVER_ATIHDMI:
		case AZX_DRIVER_ATIHDMI_NS:
			chip->playback_streams = ATIHDMI_NUM_PLAYBACK;
			chip->capture_streams = ATIHDMI_NUM_CAPTURE;
			break;
		case AZX_DRIVER_GENERIC:
		default:
			chip->playback_streams = ICH6_NUM_PLAYBACK;
			chip->capture_streams = ICH6_NUM_CAPTURE;
			break;
		}
	}
	chip->capture_index_offset = 0;
	chip->playback_index_offset = chip->capture_streams;
	chip->num_streams = chip->playback_streams + chip->capture_streams;
	chip->azx_dev = kcalloc(chip->num_streams, sizeof(*chip->azx_dev),
				GFP_KERNEL);
	if (!chip->azx_dev) {
		dev_err(card->dev, "cannot malloc azx_dev\n");
		return -ENOMEM;
	}

	for (i = 0; i < chip->num_streams; i++) {
		dsp_lock_init(&chip->azx_dev[i]);
		/* allocate memory for the BDL for each stream */
		err = chip->ops->dma_alloc_pages(chip, SNDRV_DMA_TYPE_DEV,
						 BDL_SIZE,
						 &chip->azx_dev[i].bdl);
		if (err < 0) {
			dev_err(card->dev, "cannot allocate BDL\n");
			return -ENOMEM;
		}
	}
	/* allocate memory for the position buffer */
	err = chip->ops->dma_alloc_pages(chip, SNDRV_DMA_TYPE_DEV,
					 chip->num_streams * 8, &chip->posbuf);
	if (err < 0) {
		dev_err(card->dev, "cannot allocate posbuf\n");
		return -ENOMEM;
	}
	/* allocate CORB/RIRB */
	err = azx_alloc_cmd_io(chip);
	if (err < 0)
		return err;

	/* initialize streams */
	azx_init_stream(chip);

	/* initialize chip */
	azx_init_pci(chip);
	azx_init_chip(chip, (probe_only[dev] & 2) == 0);

	/* codec detection */
	if (!chip->codec_mask) {
		dev_err(card->dev, "no codecs found!\n");
		return -ENODEV;
	}

	strcpy(card->driver, "HDA-Intel");
	strlcpy(card->shortname, driver_short_names[chip->driver_type],
		sizeof(card->shortname));
	snprintf(card->longname, sizeof(card->longname),
		 "%s at 0x%lx irq %i",
		 card->shortname, chip->addr, chip->irq);

	return 0;
}

static void power_down_all_codecs(struct azx *chip)
{
#ifdef CONFIG_PM
	/* The codecs were powered up in snd_hda_codec_new().
	 * Now all initialization done, so turn them down if possible
	 */
	struct hda_codec *codec;
	list_for_each_entry(codec, &chip->bus->codec_list, list) {
		snd_hda_power_down(codec);
	}
#endif
}

#ifdef CONFIG_SND_HDA_PATCH_LOADER
/* callback from request_firmware_nowait() */
static void azx_firmware_cb(const struct firmware *fw, void *context)
{
	struct snd_card *card = context;
	struct azx *chip = card->private_data;
	struct pci_dev *pci = chip->pci;

	if (!fw) {
		dev_err(card->dev, "Cannot load firmware, aborting\n");
		goto error;
	}

	chip->fw = fw;
	if (!chip->disabled) {
		/* continue probing */
		if (azx_probe_continue(chip))
			goto error;
	}
	return; /* OK */

 error:
	snd_card_free(card);
	pci_set_drvdata(pci, NULL);
}
#endif

/*
 * HDA controller ops.
 */

/* PCI register access. */
static void pci_azx_writel(u32 value, u32 *addr)
{
	writel(value, addr);
}

static u32 pci_azx_readl(u32 *addr)
{
	return readl(addr);
}

static void pci_azx_writew(u16 value, u16 *addr)
{
	writew(value, addr);
}

static u16 pci_azx_readw(u16 *addr)
{
	return readw(addr);
}

static void pci_azx_writeb(u8 value, u8 *addr)
{
	writeb(value, addr);
}

static u8 pci_azx_readb(u8 *addr)
{
	return readb(addr);
}

static int disable_msi_reset_irq(struct azx *chip)
{
	int err;

	free_irq(chip->irq, chip);
	chip->irq = -1;
	pci_disable_msi(chip->pci);
	chip->msi = 0;
	err = azx_acquire_irq(chip, 1);
	if (err < 0)
		return err;

	return 0;
}

/* DMA page allocation helpers.  */
static int dma_alloc_pages(struct azx *chip,
			   int type,
			   size_t size,
			   struct snd_dma_buffer *buf)
{
	int err;

	err = snd_dma_alloc_pages(type,
				  chip->card->dev,
				  size, buf);
	if (err < 0)
		return err;
	mark_pages_wc(chip, buf, true);
	return 0;
}

static void dma_free_pages(struct azx *chip, struct snd_dma_buffer *buf)
{
	mark_pages_wc(chip, buf, false);
	snd_dma_free_pages(buf);
}

static int substream_alloc_pages(struct azx *chip,
				 struct snd_pcm_substream *substream,
				 size_t size)
{
	struct azx_dev *azx_dev = get_azx_dev(substream);
	int ret;

	mark_runtime_wc(chip, azx_dev, substream, false);
	azx_dev->bufsize = 0;
	azx_dev->period_bytes = 0;
	azx_dev->format_val = 0;
	ret = snd_pcm_lib_malloc_pages(substream, size);
	if (ret < 0)
		return ret;
	mark_runtime_wc(chip, azx_dev, substream, true);
	return 0;
}

static int substream_free_pages(struct azx *chip,
				struct snd_pcm_substream *substream)
{
	struct azx_dev *azx_dev = get_azx_dev(substream);
	mark_runtime_wc(chip, azx_dev, substream, false);
	return snd_pcm_lib_free_pages(substream);
}

static const struct hda_controller_ops pci_hda_ops = {
	.writel = pci_azx_writel,
	.readl = pci_azx_readl,
	.writew = pci_azx_writew,
	.readw = pci_azx_readw,
	.writeb = pci_azx_writeb,
	.readb = pci_azx_readb,
	.disable_msi_reset_irq = disable_msi_reset_irq,
	.dma_alloc_pages = dma_alloc_pages,
	.dma_free_pages = dma_free_pages,
	.substream_alloc_pages = substream_alloc_pages,
	.substream_free_pages = substream_free_pages,
};

static int azx_probe(struct pci_dev *pci,
		     const struct pci_device_id *pci_id)
{
	static int dev;
	struct snd_card *card;
	struct azx *chip;
	bool schedule_probe;
	int err;

	if (dev >= SNDRV_CARDS)
		return -ENODEV;
	if (!enable[dev]) {
		dev++;
		return -ENOENT;
	}

	err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
			   0, &card);
	if (err < 0) {
		dev_err(&pci->dev, "Error creating card!\n");
		return err;
	}

	err = azx_create(card, pci, dev, pci_id->driver_data,
			 &pci_hda_ops, &chip);
	if (err < 0)
		goto out_free;
	card->private_data = chip;

	pci_set_drvdata(pci, card);

	err = register_vga_switcheroo(chip);
	if (err < 0) {
		dev_err(card->dev, "Error registering VGA-switcheroo client\n");
		goto out_free;
	}

	if (check_hdmi_disabled(pci)) {
		dev_info(card->dev, "VGA controller is disabled\n");
		dev_info(card->dev, "Delaying initialization\n");
		chip->disabled = true;
	}

	schedule_probe = !chip->disabled;

#ifdef CONFIG_SND_HDA_PATCH_LOADER
	if (patch[dev] && *patch[dev]) {
		dev_info(card->dev, "Applying patch firmware '%s'\n",
			 patch[dev]);
		err = request_firmware_nowait(THIS_MODULE, true, patch[dev],
					      &pci->dev, GFP_KERNEL, card,
					      azx_firmware_cb);
		if (err < 0)
			goto out_free;
		schedule_probe = false; /* continued in azx_firmware_cb() */
	}
#endif /* CONFIG_SND_HDA_PATCH_LOADER */

#ifndef CONFIG_SND_HDA_I915
	if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
		dev_err(card->dev, "Haswell must build in CONFIG_SND_HDA_I915\n");
#endif

	if (schedule_probe)
		schedule_work(&chip->probe_work);

	dev++;
	if (chip->disabled)
		complete_all(&chip->probe_wait);
	return 0;

out_free:
	snd_card_free(card);
	return err;
}

/* number of codec slots for each chipset: 0 = default slots (i.e. 4) */
static unsigned int azx_max_codecs[AZX_NUM_DRIVERS] = {
	[AZX_DRIVER_NVIDIA] = 8,
	[AZX_DRIVER_TERA] = 1,
};

static int azx_probe_continue(struct azx *chip)
{
	struct pci_dev *pci = chip->pci;
	int dev = chip->dev_index;
	int err;

	/* Request power well for Haswell HDA controller and codec */
	if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {
#ifdef CONFIG_SND_HDA_I915
		err = hda_i915_init();
		if (err < 0) {
			dev_err(chip->card->dev,
				"Error request power-well from i915\n");
			goto out_free;
		}
#endif
		hda_display_power(true);
	}

	err = azx_first_init(chip);
	if (err < 0)
		goto out_free;

#ifdef CONFIG_SND_HDA_INPUT_BEEP
	chip->beep_mode = beep_mode[dev];
#endif

	/* create codec instances */
	err = azx_codec_create(chip, model[dev],
			       azx_max_codecs[chip->driver_type],
			       power_save_addr);

	if (err < 0)
		goto out_free;
#ifdef CONFIG_SND_HDA_PATCH_LOADER
	if (chip->fw) {
		err = snd_hda_load_patch(chip->bus, chip->fw->size,
					 chip->fw->data);
		if (err < 0)
			goto out_free;
#ifndef CONFIG_PM
		release_firmware(chip->fw); /* no longer needed */
		chip->fw = NULL;
#endif
	}
#endif
	if ((probe_only[dev] & 1) == 0) {
		err = azx_codec_configure(chip);
		if (err < 0)
			goto out_free;
	}

	/* create PCM streams */
	err = snd_hda_build_pcms(chip->bus);
	if (err < 0)
		goto out_free;

	/* create mixer controls */
	err = azx_mixer_create(chip);
	if (err < 0)
		goto out_free;

	err = snd_card_register(chip->card);
	if (err < 0)
		goto out_free;

	chip->running = 1;
	power_down_all_codecs(chip);
	azx_notifier_register(chip);
	azx_add_card_list(chip);
	if ((chip->driver_caps & AZX_DCAPS_PM_RUNTIME) || chip->use_vga_switcheroo)
		pm_runtime_put_noidle(&pci->dev);

out_free:
	if (err < 0)
		chip->init_failed = 1;
	complete_all(&chip->probe_wait);
	return err;
}

static void azx_remove(struct pci_dev *pci)
{
	struct snd_card *card = pci_get_drvdata(pci);

	if (card)
		snd_card_free(card);
}

/* PCI IDs */
static DEFINE_PCI_DEVICE_TABLE(azx_ids) = {
	/* CPT */
	{ PCI_DEVICE(0x8086, 0x1c20),
	  .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH_NOPM },
	/* PBG */
	{ PCI_DEVICE(0x8086, 0x1d20),
	  .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH_NOPM },
	/* Panther Point */
	{ PCI_DEVICE(0x8086, 0x1e20),
	  .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH },
	/* Lynx Point */
	{ PCI_DEVICE(0x8086, 0x8c20),
	  .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH },
	/* Wellsburg */
	{ PCI_DEVICE(0x8086, 0x8d20),
	  .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH },
	{ PCI_DEVICE(0x8086, 0x8d21),
	  .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH },
	/* Lynx Point-LP */
	{ PCI_DEVICE(0x8086, 0x9c20),
	  .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH },
	/* Lynx Point-LP */
	{ PCI_DEVICE(0x8086, 0x9c21),
	  .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH },
	/* Wildcat Point-LP */
	{ PCI_DEVICE(0x8086, 0x9ca0),
	  .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH },
	/* Haswell */
	{ PCI_DEVICE(0x8086, 0x0a0c),
	  .driver_data = AZX_DRIVER_HDMI | AZX_DCAPS_INTEL_HASWELL },
	{ PCI_DEVICE(0x8086, 0x0c0c),
	  .driver_data = AZX_DRIVER_HDMI | AZX_DCAPS_INTEL_HASWELL },
	{ PCI_DEVICE(0x8086, 0x0d0c),
	  .driver_data = AZX_DRIVER_HDMI | AZX_DCAPS_INTEL_HASWELL },
	/* Broadwell */
	{ PCI_DEVICE(0x8086, 0x160c),
	  .driver_data = AZX_DRIVER_HDMI | AZX_DCAPS_INTEL_HASWELL },
	/* 5 Series/3400 */
	{ PCI_DEVICE(0x8086, 0x3b56),
	  .driver_data = AZX_DRIVER_SCH | AZX_DCAPS_INTEL_PCH_NOPM },
	/* Poulsbo */
	{ PCI_DEVICE(0x8086, 0x811b),
	  .driver_data = AZX_DRIVER_SCH | AZX_DCAPS_INTEL_PCH_NOPM },
	/* Oaktrail */
	{ PCI_DEVICE(0x8086, 0x080a),
	  .driver_data = AZX_DRIVER_SCH | AZX_DCAPS_INTEL_PCH_NOPM },
	/* BayTrail */
	{ PCI_DEVICE(0x8086, 0x0f04),
	  .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH_NOPM },
	/* ICH */
	{ PCI_DEVICE(0x8086, 0x2668),
	  .driver_data = AZX_DRIVER_ICH | AZX_DCAPS_OLD_SSYNC |
	  AZX_DCAPS_BUFSIZE },  /* ICH6 */
	{ PCI_DEVICE(0x8086, 0x27d8),
	  .driver_data = AZX_DRIVER_ICH | AZX_DCAPS_OLD_SSYNC |
	  AZX_DCAPS_BUFSIZE },  /* ICH7 */
	{ PCI_DEVICE(0x8086, 0x269a),
	  .driver_data = AZX_DRIVER_ICH | AZX_DCAPS_OLD_SSYNC |
	  AZX_DCAPS_BUFSIZE },  /* ESB2 */
	{ PCI_DEVICE(0x8086, 0x284b),
	  .driver_data = AZX_DRIVER_ICH | AZX_DCAPS_OLD_SSYNC |
	  AZX_DCAPS_BUFSIZE },  /* ICH8 */
	{ PCI_DEVICE(0x8086, 0x293e),
	  .driver_data = AZX_DRIVER_ICH | AZX_DCAPS_OLD_SSYNC |
	  AZX_DCAPS_BUFSIZE },  /* ICH9 */
	{ PCI_DEVICE(0x8086, 0x293f),
	  .driver_data = AZX_DRIVER_ICH | AZX_DCAPS_OLD_SSYNC |
	  AZX_DCAPS_BUFSIZE },  /* ICH9 */
	{ PCI_DEVICE(0x8086, 0x3a3e),
	  .driver_data = AZX_DRIVER_ICH | AZX_DCAPS_OLD_SSYNC |
	  AZX_DCAPS_BUFSIZE },  /* ICH10 */
	{ PCI_DEVICE(0x8086, 0x3a6e),
	  .driver_data = AZX_DRIVER_ICH | AZX_DCAPS_OLD_SSYNC |
	  AZX_DCAPS_BUFSIZE },  /* ICH10 */
	/* Generic Intel */
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_ANY_ID),
	  .class = PCI_CLASS_MULTIMEDIA_HD_AUDIO << 8,
	  .class_mask = 0xffffff,
	  .driver_data = AZX_DRIVER_ICH | AZX_DCAPS_BUFSIZE },
	/* ATI SB 450/600/700/800/900 */
	{ PCI_DEVICE(0x1002, 0x437b),
	  .driver_data = AZX_DRIVER_ATI | AZX_DCAPS_PRESET_ATI_SB },
	{ PCI_DEVICE(0x1002, 0x4383),
	  .driver_data = AZX_DRIVER_ATI | AZX_DCAPS_PRESET_ATI_SB },
	/* AMD Hudson */
	{ PCI_DEVICE(0x1022, 0x780d),
	  .driver_data = AZX_DRIVER_GENERIC | AZX_DCAPS_PRESET_ATI_SB },
	/* ATI HDMI */
	{ PCI_DEVICE(0x1002, 0x793b),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0x7919),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0x960f),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0x970f),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaa00),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaa08),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaa10),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaa18),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaa20),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaa28),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaa30),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaa38),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaa40),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaa48),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaa50),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaa58),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaa60),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaa68),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaa80),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaa88),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaa90),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaa98),
	  .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0x9902),
	  .driver_data = AZX_DRIVER_ATIHDMI_NS | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaaa0),
	  .driver_data = AZX_DRIVER_ATIHDMI_NS | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaaa8),
	  .driver_data = AZX_DRIVER_ATIHDMI_NS | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(0x1002, 0xaab0),
	  .driver_data = AZX_DRIVER_ATIHDMI_NS | AZX_DCAPS_PRESET_ATI_HDMI },
	/* VIA VT8251/VT8237A */
	{ PCI_DEVICE(0x1106, 0x3288),
	  .driver_data = AZX_DRIVER_VIA | AZX_DCAPS_POSFIX_VIA },
	/* VIA GFX VT7122/VX900 */
	{ PCI_DEVICE(0x1106, 0x9170), .driver_data = AZX_DRIVER_GENERIC },
	/* VIA GFX VT6122/VX11 */
	{ PCI_DEVICE(0x1106, 0x9140), .driver_data = AZX_DRIVER_GENERIC },
	/* SIS966 */
	{ PCI_DEVICE(0x1039, 0x7502), .driver_data = AZX_DRIVER_SIS },
	/* ULI M5461 */
	{ PCI_DEVICE(0x10b9, 0x5461), .driver_data = AZX_DRIVER_ULI },
	/* NVIDIA MCP */
	{ PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID),
	  .class = PCI_CLASS_MULTIMEDIA_HD_AUDIO << 8,
	  .class_mask = 0xffffff,
	  .driver_data = AZX_DRIVER_NVIDIA | AZX_DCAPS_PRESET_NVIDIA },
	/* Teradici */
	{ PCI_DEVICE(0x6549, 0x1200),
	  .driver_data = AZX_DRIVER_TERA | AZX_DCAPS_NO_64BIT },
	{ PCI_DEVICE(0x6549, 0x2200),
	  .driver_data = AZX_DRIVER_TERA | AZX_DCAPS_NO_64BIT },
	/* Creative X-Fi (CA0110-IBG) */
	/* CTHDA chips */
	{ PCI_DEVICE(0x1102, 0x0010),
	  .driver_data = AZX_DRIVER_CTHDA | AZX_DCAPS_PRESET_CTHDA },
	{ PCI_DEVICE(0x1102, 0x0012),
	  .driver_data = AZX_DRIVER_CTHDA | AZX_DCAPS_PRESET_CTHDA },
#if !IS_ENABLED(CONFIG_SND_CTXFI)
	/* the following entry conflicts with snd-ctxfi driver,
	 * as ctxfi driver mutates from HD-audio to native mode with
	 * a special command sequence.
	 */
	{ PCI_DEVICE(PCI_VENDOR_ID_CREATIVE, PCI_ANY_ID),
	  .class = PCI_CLASS_MULTIMEDIA_HD_AUDIO << 8,
	  .class_mask = 0xffffff,
	  .driver_data = AZX_DRIVER_CTX | AZX_DCAPS_CTX_WORKAROUND |
	  AZX_DCAPS_RIRB_PRE_DELAY | AZX_DCAPS_POSFIX_LPIB },
#else
	/* this entry seems still valid -- i.e. without emu20kx chip */
	{ PCI_DEVICE(0x1102, 0x0009),
	  .driver_data = AZX_DRIVER_CTX | AZX_DCAPS_CTX_WORKAROUND |
	  AZX_DCAPS_RIRB_PRE_DELAY | AZX_DCAPS_POSFIX_LPIB },
#endif
	/* Vortex86MX */
	{ PCI_DEVICE(0x17f3, 0x3010), .driver_data = AZX_DRIVER_GENERIC },
	/* VMware HDAudio */
	{ PCI_DEVICE(0x15ad, 0x1977), .driver_data = AZX_DRIVER_GENERIC },
	/* AMD/ATI Generic, PCI class code and Vendor ID for HD Audio */
	{ PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_ANY_ID),
	  .class = PCI_CLASS_MULTIMEDIA_HD_AUDIO << 8,
	  .class_mask = 0xffffff,
	  .driver_data = AZX_DRIVER_GENERIC | AZX_DCAPS_PRESET_ATI_HDMI },
	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_ANY_ID),
	  .class = PCI_CLASS_MULTIMEDIA_HD_AUDIO << 8,
	  .class_mask = 0xffffff,
	  .driver_data = AZX_DRIVER_GENERIC | AZX_DCAPS_PRESET_ATI_HDMI },
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, azx_ids);

/* pci_driver definition */
static struct pci_driver azx_driver = {
	.name = KBUILD_MODNAME,
	.id_table = azx_ids,
	.probe = azx_probe,
	.remove = azx_remove,
	.driver = {
		.pm = AZX_PM_OPS,
	},
};

module_pci_driver(azx_driver);