[linux-2.6-block.git] / sound / hda / hdac_controller.c

/*
 * HD-audio controller helpers
 */

#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <sound/core.h>
#include <sound/hdaudio.h>
#include <sound/hda_register.h>

/* clear CORB read pointer properly */
static void azx_clear_corbrp(struct hdac_bus *bus)
{
	int timeout;

	for (timeout = 1000; timeout > 0; timeout--) {
		if (snd_hdac_chip_readw(bus, CORBRP) & AZX_CORBRP_RST)
			break;
		udelay(1);
	}
	if (timeout <= 0)
		dev_err(bus->dev, "CORB reset timeout#1, CORBRP = %d\n",
			snd_hdac_chip_readw(bus, CORBRP));

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

/**
 * snd_hdac_bus_init_cmd_io - set up CORB/RIRB buffers
 * @bus: HD-audio core bus
 */
void snd_hdac_bus_init_cmd_io(struct hdac_bus *bus)
{
	WARN_ON_ONCE(!bus->rb.area);

	spin_lock_irq(&bus->reg_lock);
	/* CORB set up */
	bus->corb.addr = bus->rb.addr;
	bus->corb.buf = (__le32 *)bus->rb.area;
	snd_hdac_chip_writel(bus, CORBLBASE, (u32)bus->corb.addr);
	snd_hdac_chip_writel(bus, CORBUBASE, upper_32_bits(bus->corb.addr));

	/* set the corb size to 256 entries (ULI requires explicitly) */
	snd_hdac_chip_writeb(bus, CORBSIZE, 0x02);
	/* set the corb write pointer to 0 */
	snd_hdac_chip_writew(bus, CORBWP, 0);

	/* reset the corb hw read pointer */
	snd_hdac_chip_writew(bus, CORBRP, AZX_CORBRP_RST);
	if (!bus->corbrp_self_clear)
		azx_clear_corbrp(bus);

	/* enable corb dma */
	snd_hdac_chip_writeb(bus, CORBCTL, AZX_CORBCTL_RUN);

	/* RIRB set up */
	bus->rirb.addr = bus->rb.addr + 2048;
	bus->rirb.buf = (__le32 *)(bus->rb.area + 2048);
	bus->rirb.wp = bus->rirb.rp = 0;
	memset(bus->rirb.cmds, 0, sizeof(bus->rirb.cmds));
	snd_hdac_chip_writel(bus, RIRBLBASE, (u32)bus->rirb.addr);
	snd_hdac_chip_writel(bus, RIRBUBASE, upper_32_bits(bus->rirb.addr));

	/* set the rirb size to 256 entries (ULI requires explicitly) */
	snd_hdac_chip_writeb(bus, RIRBSIZE, 0x02);
	/* reset the rirb hw write pointer */
	snd_hdac_chip_writew(bus, RIRBWP, AZX_RIRBWP_RST);
	/* set N=1, get RIRB response interrupt for new entry */
	snd_hdac_chip_writew(bus, RINTCNT, 1);
	/* enable rirb dma and response irq */
	snd_hdac_chip_writeb(bus, RIRBCTL, AZX_RBCTL_DMA_EN | AZX_RBCTL_IRQ_EN);
	spin_unlock_irq(&bus->reg_lock);
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_init_cmd_io);

/* wait for cmd dmas till they are stopped */
static void hdac_wait_for_cmd_dmas(struct hdac_bus *bus)
{
	unsigned long timeout;

	timeout = jiffies + msecs_to_jiffies(100);
	while ((snd_hdac_chip_readb(bus, RIRBCTL) & AZX_RBCTL_DMA_EN)
		&& time_before(jiffies, timeout))
		udelay(10);

	timeout = jiffies + msecs_to_jiffies(100);
	while ((snd_hdac_chip_readb(bus, CORBCTL) & AZX_CORBCTL_RUN)
		&& time_before(jiffies, timeout))
		udelay(10);
}

/**
 * snd_hdac_bus_stop_cmd_io - clean up CORB/RIRB buffers
 * @bus: HD-audio core bus
 */
void snd_hdac_bus_stop_cmd_io(struct hdac_bus *bus)
{
	spin_lock_irq(&bus->reg_lock);
	/* disable ringbuffer DMAs */
	snd_hdac_chip_writeb(bus, RIRBCTL, 0);
	snd_hdac_chip_writeb(bus, CORBCTL, 0);
	spin_unlock_irq(&bus->reg_lock);

	hdac_wait_for_cmd_dmas(bus);

	spin_lock_irq(&bus->reg_lock);
	/* disable unsolicited responses */
	snd_hdac_chip_updatel(bus, GCTL, AZX_GCTL_UNSOL, 0);
	spin_unlock_irq(&bus->reg_lock);
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_stop_cmd_io);

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

	if (snd_BUG_ON(addr >= HDA_MAX_CODECS))
		addr = 0;
	return addr;
}

/**
 * snd_hdac_bus_send_cmd - send a command verb via CORB
 * @bus: HD-audio core bus
 * @val: encoded verb value to send
 *
 * Returns zero for success or a negative error code.
 */
int snd_hdac_bus_send_cmd(struct hdac_bus *bus, unsigned int val)
{
	unsigned int addr = azx_command_addr(val);
	unsigned int wp, rp;

	spin_lock_irq(&bus->reg_lock);

	bus->last_cmd[azx_command_addr(val)] = val;

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

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

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

	spin_unlock_irq(&bus->reg_lock);

	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_send_cmd);

#define AZX_RIRB_EX_UNSOL_EV	(1<<4)

/**
 * snd_hdac_bus_update_rirb - retrieve RIRB entries
 * @bus: HD-audio core bus
 *
 * Usually called from interrupt handler.
 */
void snd_hdac_bus_update_rirb(struct hdac_bus *bus)
{
	unsigned int rp, wp;
	unsigned int addr;
	u32 res, res_ex;

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

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

	while (bus->rirb.rp != wp) {
		bus->rirb.rp++;
		bus->rirb.rp %= AZX_MAX_RIRB_ENTRIES;

		rp = bus->rirb.rp << 1; /* an RIRB entry is 8-bytes */
		res_ex = le32_to_cpu(bus->rirb.buf[rp + 1]);
		res = le32_to_cpu(bus->rirb.buf[rp]);
		addr = res_ex & 0xf;
		if (addr >= HDA_MAX_CODECS) {
			dev_err(bus->dev,
				"spurious response %#x:%#x, rp = %d, wp = %d",
				res, res_ex, bus->rirb.rp, wp);
			snd_BUG();
		} else if (res_ex & AZX_RIRB_EX_UNSOL_EV)
			snd_hdac_bus_queue_event(bus, res, res_ex);
		else if (bus->rirb.cmds[addr]) {
			bus->rirb.res[addr] = res;
			bus->rirb.cmds[addr]--;
		} else {
			dev_err_ratelimited(bus->dev,
				"spurious response %#x:%#x, last cmd=%#08x\n",
				res, res_ex, bus->last_cmd[addr]);
		}
	}
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_update_rirb);

/**
 * snd_hdac_bus_get_response - receive a response via RIRB
 * @bus: HD-audio core bus
 * @addr: codec address
 * @res: pointer to store the value, NULL when not needed
 *
 * Returns zero if a value is read, or a negative error code.
 */
int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr,
			      unsigned int *res)
{
	unsigned long timeout;
	unsigned long loopcounter;

	timeout = jiffies + msecs_to_jiffies(1000);

	for (loopcounter = 0;; loopcounter++) {
		if (bus->polling_mode)
			snd_hdac_bus_update_rirb(bus);
		spin_lock_irq(&bus->reg_lock);
		if (!bus->rirb.cmds[addr]) {
			if (res)
				*res = bus->rirb.res[addr]; /* the last value */
			spin_unlock_irq(&bus->reg_lock);
			return 0;
		}
		spin_unlock_irq(&bus->reg_lock);
		if (time_after(jiffies, timeout))
			break;
		if (loopcounter > 3000)
			msleep(2); /* temporary workaround */
		else {
			udelay(10);
			cond_resched();
		}
	}

	return -EIO;
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_get_response);

#define HDAC_MAX_CAPS 10
/**
 * snd_hdac_bus_parse_capabilities - parse capability structure
 * @bus: the pointer to bus object
 *
 * Returns 0 if successful, or a negative error code.
 */
int snd_hdac_bus_parse_capabilities(struct hdac_bus *bus)
{
	unsigned int cur_cap;
	unsigned int offset;
	unsigned int counter = 0;

	offset = snd_hdac_chip_readw(bus, LLCH);

	/* Lets walk the linked capabilities list */
	do {
		cur_cap = _snd_hdac_chip_readl(bus, offset);

		dev_dbg(bus->dev, "Capability version: 0x%x\n",
			(cur_cap & AZX_CAP_HDR_VER_MASK) >> AZX_CAP_HDR_VER_OFF);

		dev_dbg(bus->dev, "HDA capability ID: 0x%x\n",
			(cur_cap & AZX_CAP_HDR_ID_MASK) >> AZX_CAP_HDR_ID_OFF);

		if (cur_cap == -1) {
			dev_dbg(bus->dev, "Invalid capability reg read\n");
			break;
		}

		switch ((cur_cap & AZX_CAP_HDR_ID_MASK) >> AZX_CAP_HDR_ID_OFF) {
		case AZX_ML_CAP_ID:
			dev_dbg(bus->dev, "Found ML capability\n");
			bus->mlcap = bus->remap_addr + offset;
			break;

		case AZX_GTS_CAP_ID:
			dev_dbg(bus->dev, "Found GTS capability offset=%x\n", offset);
			bus->gtscap = bus->remap_addr + offset;
			break;

		case AZX_PP_CAP_ID:
			/* PP capability found, the Audio DSP is present */
			dev_dbg(bus->dev, "Found PP capability offset=%x\n", offset);
			bus->ppcap = bus->remap_addr + offset;
			break;

		case AZX_SPB_CAP_ID:
			/* SPIB capability found, handler function */
			dev_dbg(bus->dev, "Found SPB capability\n");
			bus->spbcap = bus->remap_addr + offset;
			break;

		case AZX_DRSM_CAP_ID:
			/* DMA resume  capability found, handler function */
			dev_dbg(bus->dev, "Found DRSM capability\n");
			bus->drsmcap = bus->remap_addr + offset;
			break;

		default:
			dev_err(bus->dev, "Unknown capability %d\n", cur_cap);
			cur_cap = 0;
			break;
		}

		counter++;

		if (counter > HDAC_MAX_CAPS) {
			dev_err(bus->dev, "We exceeded HDAC capabilities!!!\n");
			break;
		}

		/* read the offset of next capability */
		offset = cur_cap & AZX_CAP_HDR_NXT_PTR_MASK;

	} while (offset);

	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_parse_capabilities);

/*
 * Lowlevel interface
 */

/**
 * snd_hdac_bus_enter_link_reset - enter link reset
 * @bus: HD-audio core bus
 *
 * Enter to the link reset state.
 */
void snd_hdac_bus_enter_link_reset(struct hdac_bus *bus)
{
	unsigned long timeout;

	/* reset controller */
	snd_hdac_chip_updatel(bus, GCTL, AZX_GCTL_RESET, 0);

	timeout = jiffies + msecs_to_jiffies(100);
	while ((snd_hdac_chip_readb(bus, GCTL) & AZX_GCTL_RESET) &&
	       time_before(jiffies, timeout))
		usleep_range(500, 1000);
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_enter_link_reset);

/**
 * snd_hdac_bus_exit_link_reset - exit link reset
 * @bus: HD-audio core bus
 *
 * Exit from the link reset state.
 */
void snd_hdac_bus_exit_link_reset(struct hdac_bus *bus)
{
	unsigned long timeout;

	snd_hdac_chip_updateb(bus, GCTL, AZX_GCTL_RESET, AZX_GCTL_RESET);

	timeout = jiffies + msecs_to_jiffies(100);
	while (!snd_hdac_chip_readb(bus, GCTL) && time_before(jiffies, timeout))
		usleep_range(500, 1000);
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_exit_link_reset);

/* reset codec link */
int snd_hdac_bus_reset_link(struct hdac_bus *bus, bool full_reset)
{
	if (!full_reset)
		goto skip_reset;

	/* clear STATESTS */
	snd_hdac_chip_writew(bus, STATESTS, STATESTS_INT_MASK);

	/* reset controller */
	snd_hdac_bus_enter_link_reset(bus);

	/* 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 */
	snd_hdac_bus_exit_link_reset(bus);

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

 skip_reset:
	/* check to see if controller is ready */
	if (!snd_hdac_chip_readb(bus, GCTL)) {
		dev_dbg(bus->dev, "controller not ready!\n");
		return -EBUSY;
	}

	/* Accept unsolicited responses */
	snd_hdac_chip_updatel(bus, GCTL, AZX_GCTL_UNSOL, AZX_GCTL_UNSOL);

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

	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_reset_link);

/* enable interrupts */
static void azx_int_enable(struct hdac_bus *bus)
{
	/* enable controller CIE and GIE */
	snd_hdac_chip_updatel(bus, INTCTL,
			      AZX_INT_CTRL_EN | AZX_INT_GLOBAL_EN,
			      AZX_INT_CTRL_EN | AZX_INT_GLOBAL_EN);
}

/* disable interrupts */
static void azx_int_disable(struct hdac_bus *bus)
{
	struct hdac_stream *azx_dev;

	/* disable interrupts in stream descriptor */
	list_for_each_entry(azx_dev, &bus->stream_list, list)
		snd_hdac_stream_updateb(azx_dev, SD_CTL, SD_INT_MASK, 0);

	/* disable SIE for all streams */
	snd_hdac_chip_writeb(bus, INTCTL, 0);

	/* disable controller CIE and GIE */
	snd_hdac_chip_updatel(bus, INTCTL, AZX_INT_CTRL_EN | AZX_INT_GLOBAL_EN, 0);
}

/* clear interrupts */
static void azx_int_clear(struct hdac_bus *bus)
{
	struct hdac_stream *azx_dev;

	/* clear stream status */
	list_for_each_entry(azx_dev, &bus->stream_list, list)
		snd_hdac_stream_writeb(azx_dev, SD_STS, SD_INT_MASK);

	/* clear STATESTS */
	snd_hdac_chip_writew(bus, STATESTS, STATESTS_INT_MASK);

	/* clear rirb status */
	snd_hdac_chip_writeb(bus, RIRBSTS, RIRB_INT_MASK);

	/* clear int status */
	snd_hdac_chip_writel(bus, INTSTS, AZX_INT_CTRL_EN | AZX_INT_ALL_STREAM);
}

/**
 * snd_hdac_bus_init_chip - reset and start the controller registers
 * @bus: HD-audio core bus
 * @full_reset: Do full reset
 */
bool snd_hdac_bus_init_chip(struct hdac_bus *bus, bool full_reset)
{
	if (bus->chip_init)
		return false;

	/* reset controller */
	snd_hdac_bus_reset_link(bus, full_reset);

	/* clear interrupts */
	azx_int_clear(bus);

	/* initialize the codec command I/O */
	snd_hdac_bus_init_cmd_io(bus);

	/* enable interrupts after CORB/RIRB buffers are initialized above */
	azx_int_enable(bus);

	/* program the position buffer */
	if (bus->use_posbuf && bus->posbuf.addr) {
		snd_hdac_chip_writel(bus, DPLBASE, (u32)bus->posbuf.addr);
		snd_hdac_chip_writel(bus, DPUBASE, upper_32_bits(bus->posbuf.addr));
	}

	bus->chip_init = true;
	return true;
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_init_chip);

/**
 * snd_hdac_bus_stop_chip - disable the whole IRQ and I/Os
 * @bus: HD-audio core bus
 */
void snd_hdac_bus_stop_chip(struct hdac_bus *bus)
{
	if (!bus->chip_init)
		return;

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

	/* disable CORB/RIRB */
	snd_hdac_bus_stop_cmd_io(bus);

	/* disable position buffer */
	if (bus->posbuf.addr) {
		snd_hdac_chip_writel(bus, DPLBASE, 0);
		snd_hdac_chip_writel(bus, DPUBASE, 0);
	}

	bus->chip_init = false;
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_stop_chip);

/**
 * snd_hdac_bus_handle_stream_irq - interrupt handler for streams
 * @bus: HD-audio core bus
 * @status: INTSTS register value
 * @ask: callback to be called for woken streams
 *
 * Returns the bits of handled streams, or zero if no stream is handled.
 */
int snd_hdac_bus_handle_stream_irq(struct hdac_bus *bus, unsigned int status,
				    void (*ack)(struct hdac_bus *,
						struct hdac_stream *))
{
	struct hdac_stream *azx_dev;
	u8 sd_status;
	int handled = 0;

	list_for_each_entry(azx_dev, &bus->stream_list, list) {
		if (status & azx_dev->sd_int_sta_mask) {
			sd_status = snd_hdac_stream_readb(azx_dev, SD_STS);
			snd_hdac_stream_writeb(azx_dev, SD_STS, SD_INT_MASK);
			handled |= 1 << azx_dev->index;
			if (!azx_dev->substream || !azx_dev->running ||
			    !(sd_status & SD_INT_COMPLETE))
				continue;
			if (ack)
				ack(bus, azx_dev);
		}
	}
	return handled;
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_handle_stream_irq);

/**
 * snd_hdac_bus_alloc_stream_pages - allocate BDL and other buffers
 * @bus: HD-audio core bus
 *
 * Call this after assigning the all streams.
 * Returns zero for success, or a negative error code.
 */
int snd_hdac_bus_alloc_stream_pages(struct hdac_bus *bus)
{
	struct hdac_stream *s;
	int num_streams = 0;
	int err;

	list_for_each_entry(s, &bus->stream_list, list) {
		/* allocate memory for the BDL for each stream */
		err = bus->io_ops->dma_alloc_pages(bus, SNDRV_DMA_TYPE_DEV,
						   BDL_SIZE, &s->bdl);
		num_streams++;
		if (err < 0)
			return -ENOMEM;
	}

	if (WARN_ON(!num_streams))
		return -EINVAL;
	/* allocate memory for the position buffer */
	err = bus->io_ops->dma_alloc_pages(bus, SNDRV_DMA_TYPE_DEV,
					   num_streams * 8, &bus->posbuf);
	if (err < 0)
		return -ENOMEM;
	list_for_each_entry(s, &bus->stream_list, list)
		s->posbuf = (__le32 *)(bus->posbuf.area + s->index * 8);

	/* single page (at least 4096 bytes) must suffice for both ringbuffes */
	return bus->io_ops->dma_alloc_pages(bus, SNDRV_DMA_TYPE_DEV,
					    PAGE_SIZE, &bus->rb);
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_alloc_stream_pages);

/**
 * snd_hdac_bus_free_stream_pages - release BDL and other buffers
 * @bus: HD-audio core bus
 */
void snd_hdac_bus_free_stream_pages(struct hdac_bus *bus)
{
	struct hdac_stream *s;

	list_for_each_entry(s, &bus->stream_list, list) {
		if (s->bdl.area)
			bus->io_ops->dma_free_pages(bus, &s->bdl);
	}

	if (bus->rb.area)
		bus->io_ops->dma_free_pages(bus, &bus->rb);
	if (bus->posbuf.area)
		bus->io_ops->dma_free_pages(bus, &bus->posbuf);
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_free_stream_pages);
Commit	Line	Data
14752412 TI	1	/*
	2	* HD-audio controller helpers
	3	*/
	4
	5	#include <linux/kernel.h>
	6	#include <linux/delay.h>
	7	#include <linux/export.h>
	8	#include <sound/core.h>
	9	#include <sound/hdaudio.h>
	10	#include <sound/hda_register.h>
	11
	12	/* clear CORB read pointer properly */
	13	static void azx_clear_corbrp(struct hdac_bus *bus)
	14	{
	15	int timeout;
	16
	17	for (timeout = 1000; timeout > 0; timeout--) {
	18	if (snd_hdac_chip_readw(bus, CORBRP) & AZX_CORBRP_RST)
	19	break;
	20	udelay(1);
	21	}
	22	if (timeout <= 0)
	23	dev_err(bus->dev, "CORB reset timeout#1, CORBRP = %d\n",
	24	snd_hdac_chip_readw(bus, CORBRP));
	25
	26	snd_hdac_chip_writew(bus, CORBRP, 0);
	27	for (timeout = 1000; timeout > 0; timeout--) {
	28	if (snd_hdac_chip_readw(bus, CORBRP) == 0)
	29	break;
	30	udelay(1);
	31	}
	32	if (timeout <= 0)
	33	dev_err(bus->dev, "CORB reset timeout#2, CORBRP = %d\n",
	34	snd_hdac_chip_readw(bus, CORBRP));
	35	}
	36
	37	/**
	38	* snd_hdac_bus_init_cmd_io - set up CORB/RIRB buffers
	39	* @bus: HD-audio core bus
	40	*/
	41	void snd_hdac_bus_init_cmd_io(struct hdac_bus *bus)
	42	{
b61749a8 YZ	43	WARN_ON_ONCE(!bus->rb.area);
b61749a8 YZ	44
14752412 TI	45	spin_lock_irq(&bus->reg_lock);
	46	/* CORB set up */
	47	bus->corb.addr = bus->rb.addr;
	48	bus->corb.buf = (__le32 *)bus->rb.area;
	49	snd_hdac_chip_writel(bus, CORBLBASE, (u32)bus->corb.addr);
	50	snd_hdac_chip_writel(bus, CORBUBASE, upper_32_bits(bus->corb.addr));
	51
	52	/* set the corb size to 256 entries (ULI requires explicitly) */
	53	snd_hdac_chip_writeb(bus, CORBSIZE, 0x02);
	54	/* set the corb write pointer to 0 */
	55	snd_hdac_chip_writew(bus, CORBWP, 0);
	56
	57	/* reset the corb hw read pointer */
	58	snd_hdac_chip_writew(bus, CORBRP, AZX_CORBRP_RST);
	59	if (!bus->corbrp_self_clear)
	60	azx_clear_corbrp(bus);
	61
	62	/* enable corb dma */
	63	snd_hdac_chip_writeb(bus, CORBCTL, AZX_CORBCTL_RUN);
	64
	65	/* RIRB set up */
	66	bus->rirb.addr = bus->rb.addr + 2048;
	67	bus->rirb.buf = (__le32 *)(bus->rb.area + 2048);
	68	bus->rirb.wp = bus->rirb.rp = 0;
	69	memset(bus->rirb.cmds, 0, sizeof(bus->rirb.cmds));
	70	snd_hdac_chip_writel(bus, RIRBLBASE, (u32)bus->rirb.addr);
	71	snd_hdac_chip_writel(bus, RIRBUBASE, upper_32_bits(bus->rirb.addr));
	72
	73	/* set the rirb size to 256 entries (ULI requires explicitly) */
	74	snd_hdac_chip_writeb(bus, RIRBSIZE, 0x02);
	75	/* reset the rirb hw write pointer */
	76	snd_hdac_chip_writew(bus, RIRBWP, AZX_RIRBWP_RST);
	77	/* set N=1, get RIRB response interrupt for new entry */
	78	snd_hdac_chip_writew(bus, RINTCNT, 1);
	79	/* enable rirb dma and response irq */
	80	snd_hdac_chip_writeb(bus, RIRBCTL, AZX_RBCTL_DMA_EN \| AZX_RBCTL_IRQ_EN);
	81	spin_unlock_irq(&bus->reg_lock);
	82	}
	83	EXPORT_SYMBOL_GPL(snd_hdac_bus_init_cmd_io);
	84
38b19ed7 JK	85	/* wait for cmd dmas till they are stopped */
	86	static void hdac_wait_for_cmd_dmas(struct hdac_bus *bus)
	87	{
	88	unsigned long timeout;
	89
	90	timeout = jiffies + msecs_to_jiffies(100);
	91	while ((snd_hdac_chip_readb(bus, RIRBCTL) & AZX_RBCTL_DMA_EN)
	92	&& time_before(jiffies, timeout))
	93	udelay(10);
	94
	95	timeout = jiffies + msecs_to_jiffies(100);
	96	while ((snd_hdac_chip_readb(bus, CORBCTL) & AZX_CORBCTL_RUN)
	97	&& time_before(jiffies, timeout))
	98	udelay(10);
	99	}
	100
14752412 TI	101	/**
	102	* snd_hdac_bus_stop_cmd_io - clean up CORB/RIRB buffers
	103	* @bus: HD-audio core bus
	104	*/
	105	void snd_hdac_bus_stop_cmd_io(struct hdac_bus *bus)
	106	{
	107	spin_lock_irq(&bus->reg_lock);
	108	/* disable ringbuffer DMAs */
	109	snd_hdac_chip_writeb(bus, RIRBCTL, 0);
	110	snd_hdac_chip_writeb(bus, CORBCTL, 0);
96001376 JK	111	spin_unlock_irq(&bus->reg_lock);
96001376 JK	112
38b19ed7	113	hdac_wait_for_cmd_dmas(bus);
96001376 JK	114
96001376 JK	115	spin_lock_irq(&bus->reg_lock);
14752412 TI	116	/* disable unsolicited responses */
	117	snd_hdac_chip_updatel(bus, GCTL, AZX_GCTL_UNSOL, 0);
	118	spin_unlock_irq(&bus->reg_lock);
	119	}
	120	EXPORT_SYMBOL_GPL(snd_hdac_bus_stop_cmd_io);
	121
	122	static unsigned int azx_command_addr(u32 cmd)
	123	{
	124	unsigned int addr = cmd >> 28;
	125
	126	if (snd_BUG_ON(addr >= HDA_MAX_CODECS))
	127	addr = 0;
	128	return addr;
	129	}
	130
	131	/**
	132	* snd_hdac_bus_send_cmd - send a command verb via CORB
	133	* @bus: HD-audio core bus
	134	* @val: encoded verb value to send
	135	*
	136	* Returns zero for success or a negative error code.
	137	*/
	138	int snd_hdac_bus_send_cmd(struct hdac_bus *bus, unsigned int val)
	139	{
	140	unsigned int addr = azx_command_addr(val);
	141	unsigned int wp, rp;
	142
	143	spin_lock_irq(&bus->reg_lock);
	144
	145	bus->last_cmd[azx_command_addr(val)] = val;
	146
	147	/* add command to corb */
	148	wp = snd_hdac_chip_readw(bus, CORBWP);
	149	if (wp == 0xffff) {
	150	/* something wrong, controller likely turned to D3 */
	151	spin_unlock_irq(&bus->reg_lock);
	152	return -EIO;
	153	}
	154	wp++;
	155	wp %= AZX_MAX_CORB_ENTRIES;
	156
	157	rp = snd_hdac_chip_readw(bus, CORBRP);
	158	if (wp == rp) {
	159	/* oops, it's full */
	160	spin_unlock_irq(&bus->reg_lock);
	161	return -EAGAIN;
	162	}
	163
	164	bus->rirb.cmds[addr]++;
	165	bus->corb.buf[wp] = cpu_to_le32(val);
	166	snd_hdac_chip_writew(bus, CORBWP, wp);
	167
	168	spin_unlock_irq(&bus->reg_lock);
	169
	170	return 0;
	171	}
	172	EXPORT_SYMBOL_GPL(snd_hdac_bus_send_cmd);
	173
	174	#define AZX_RIRB_EX_UNSOL_EV (1<<4)
	175
	176	/**
	177	* snd_hdac_bus_update_rirb - retrieve RIRB entries
	178	* @bus: HD-audio core bus
	179	*
180	* Usually called from interrupt handler.
181	*/
182	void snd_hdac_bus_update_rirb(struct hdac_bus *bus)
183	{
184	unsigned int rp, wp;
185	unsigned int addr;
186	u32 res, res_ex;
187
188	wp = snd_hdac_chip_readw(bus, RIRBWP);
189	if (wp == 0xffff) {
190	/* something wrong, controller likely turned to D3 */
191	return;
192	}
193
194	if (wp == bus->rirb.wp)
195	return;
196	bus->rirb.wp = wp;
197
198	while (bus->rirb.rp != wp) {
199	bus->rirb.rp++;
200	bus->rirb.rp %= AZX_MAX_RIRB_ENTRIES;
201
202	rp = bus->rirb.rp << 1; /* an RIRB entry is 8-bytes */
203	res_ex = le32_to_cpu(bus->rirb.buf[rp + 1]);
204	res = le32_to_cpu(bus->rirb.buf[rp]);
205	addr = res_ex & 0xf;
206	if (addr >= HDA_MAX_CODECS) {
207	dev_err(bus->dev,
208	"spurious response %#x:%#x, rp = %d, wp = %d",
209	res, res_ex, bus->rirb.rp, wp);
210	snd_BUG();
211	} else if (res_ex & AZX_RIRB_EX_UNSOL_EV)
212	snd_hdac_bus_queue_event(bus, res, res_ex);
213	else if (bus->rirb.cmds[addr]) {
214	bus->rirb.res[addr] = res;
215	bus->rirb.cmds[addr]--;
216	} else {
217	dev_err_ratelimited(bus->dev,
218	"spurious response %#x:%#x, last cmd=%#08x\n",
219	res, res_ex, bus->last_cmd[addr]);
220	}
221	}
222	}
223	EXPORT_SYMBOL_GPL(snd_hdac_bus_update_rirb);
224
225	/**
226	* snd_hdac_bus_get_response - receive a response via RIRB
227	* @bus: HD-audio core bus
228	* @addr: codec address
229	* @res: pointer to store the value, NULL when not needed
230	*
231	* Returns zero if a value is read, or a negative error code.
232	*/
233	int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr,
234	unsigned int *res)
235	{
236	unsigned long timeout;
237	unsigned long loopcounter;
238
239	timeout = jiffies + msecs_to_jiffies(1000);
240
241	for (loopcounter = 0;; loopcounter++) {
5e13cf6c BL	242	if (bus->polling_mode)
5e13cf6c BL	243	snd_hdac_bus_update_rirb(bus);
14752412 TI	244	spin_lock_irq(&bus->reg_lock);
	245	if (!bus->rirb.cmds[addr]) {
	246	if (res)
	247	res = bus->rirb.res[addr]; / the last value */
	248	spin_unlock_irq(&bus->reg_lock);
	249	return 0;
	250	}
	251	spin_unlock_irq(&bus->reg_lock);
	252	if (time_after(jiffies, timeout))
	253	break;
	254	if (loopcounter > 3000)
	255	msleep(2); /* temporary workaround */
	256	else {
	257	udelay(10);
	258	cond_resched();
	259	}
	260	}
	261
	262	return -EIO;
	263	}
	264	EXPORT_SYMBOL_GPL(snd_hdac_bus_get_response);
	265
6720b384 VK	266	#define HDAC_MAX_CAPS 10
	267	/**
	268	* snd_hdac_bus_parse_capabilities - parse capability structure
	269	* @bus: the pointer to bus object
	270	*
	271	* Returns 0 if successful, or a negative error code.
	272	*/
	273	int snd_hdac_bus_parse_capabilities(struct hdac_bus *bus)
	274	{
	275	unsigned int cur_cap;
	276	unsigned int offset;
	277	unsigned int counter = 0;
	278
ccfdf9f6	279	offset = snd_hdac_chip_readw(bus, LLCH);
6720b384 VK	280
	281	/* Lets walk the linked capabilities list */
	282	do {
2c1f8138	283	cur_cap = _snd_hdac_chip_readl(bus, offset);
6720b384 VK	284
	285	dev_dbg(bus->dev, "Capability version: 0x%x\n",
	286	(cur_cap & AZX_CAP_HDR_VER_MASK) >> AZX_CAP_HDR_VER_OFF);
	287
	288	dev_dbg(bus->dev, "HDA capability ID: 0x%x\n",
	289	(cur_cap & AZX_CAP_HDR_ID_MASK) >> AZX_CAP_HDR_ID_OFF);
	290
098a0a62 TI	291	if (cur_cap == -1) {
	292	dev_dbg(bus->dev, "Invalid capability reg read\n");
	293	break;
	294	}
	295
6720b384 VK	296	switch ((cur_cap & AZX_CAP_HDR_ID_MASK) >> AZX_CAP_HDR_ID_OFF) {
	297	case AZX_ML_CAP_ID:
	298	dev_dbg(bus->dev, "Found ML capability\n");
	299	bus->mlcap = bus->remap_addr + offset;
	300	break;
	301
	302	case AZX_GTS_CAP_ID:
	303	dev_dbg(bus->dev, "Found GTS capability offset=%x\n", offset);
	304	bus->gtscap = bus->remap_addr + offset;
	305	break;
	306
	307	case AZX_PP_CAP_ID:
	308	/* PP capability found, the Audio DSP is present */
	309	dev_dbg(bus->dev, "Found PP capability offset=%x\n", offset);
	310	bus->ppcap = bus->remap_addr + offset;
	311	break;
	312
	313	case AZX_SPB_CAP_ID:
	314	/* SPIB capability found, handler function */
	315	dev_dbg(bus->dev, "Found SPB capability\n");
	316	bus->spbcap = bus->remap_addr + offset;
	317	break;
	318
	319	case AZX_DRSM_CAP_ID:
	320	/* DMA resume capability found, handler function */
	321	dev_dbg(bus->dev, "Found DRSM capability\n");
	322	bus->drsmcap = bus->remap_addr + offset;
	323	break;
	324
	325	default:
b676da70 RU	326	dev_err(bus->dev, "Unknown capability %d\n", cur_cap);
b676da70 RU	327	cur_cap = 0;
6720b384 VK	328	break;
	329	}
	330
	331	counter++;
	332
	333	if (counter > HDAC_MAX_CAPS) {
	334	dev_err(bus->dev, "We exceeded HDAC capabilities!!!\n");
	335	break;
	336	}
	337
	338	/* read the offset of next capability */
	339	offset = cur_cap & AZX_CAP_HDR_NXT_PTR_MASK;
	340
	341	} while (offset);
	342
	343	return 0;
	344	}
	345	EXPORT_SYMBOL_GPL(snd_hdac_bus_parse_capabilities);
	346
14752412 TI	347	/*
	348	* Lowlevel interface
	349	*/
	350
	351	/**
	352	* snd_hdac_bus_enter_link_reset - enter link reset
	353	* @bus: HD-audio core bus
	354	*
	355	* Enter to the link reset state.
	356	*/
	357	void snd_hdac_bus_enter_link_reset(struct hdac_bus *bus)
	358	{
	359	unsigned long timeout;
	360
	361	/* reset controller */
	362	snd_hdac_chip_updatel(bus, GCTL, AZX_GCTL_RESET, 0);
	363
	364	timeout = jiffies + msecs_to_jiffies(100);
	365	while ((snd_hdac_chip_readb(bus, GCTL) & AZX_GCTL_RESET) &&
	366	time_before(jiffies, timeout))
	367	usleep_range(500, 1000);
	368	}
	369	EXPORT_SYMBOL_GPL(snd_hdac_bus_enter_link_reset);
	370
	371	/**
	372	* snd_hdac_bus_exit_link_reset - exit link reset
	373	* @bus: HD-audio core bus
	374	*
	375	* Exit from the link reset state.
	376	*/
	377	void snd_hdac_bus_exit_link_reset(struct hdac_bus *bus)
	378	{
	379	unsigned long timeout;
	380
081e01f0	381	snd_hdac_chip_updateb(bus, GCTL, AZX_GCTL_RESET, AZX_GCTL_RESET);
14752412 TI	382
	383	timeout = jiffies + msecs_to_jiffies(100);
	384	while (!snd_hdac_chip_readb(bus, GCTL) && time_before(jiffies, timeout))
	385	usleep_range(500, 1000);
	386	}
	387	EXPORT_SYMBOL_GPL(snd_hdac_bus_exit_link_reset);
	388
	389	/* reset codec link */
75383f8d	390	int snd_hdac_bus_reset_link(struct hdac_bus *bus, bool full_reset)
14752412 TI	391	{
	392	if (!full_reset)
	393	goto skip_reset;
	394
	395	/* clear STATESTS */
	396	snd_hdac_chip_writew(bus, STATESTS, STATESTS_INT_MASK);
	397
	398	/* reset controller */
	399	snd_hdac_bus_enter_link_reset(bus);
	400
	401	/* delay for >= 100us for codec PLL to settle per spec
	402	* Rev 0.9 section 5.5.1
	403	*/
	404	usleep_range(500, 1000);
	405
	406	/* Bring controller out of reset */
	407	snd_hdac_bus_exit_link_reset(bus);
	408
	409	/* Brent Chartrand said to wait >= 540us for codecs to initialize */
	410	usleep_range(1000, 1200);
	411
	412	skip_reset:
	413	/* check to see if controller is ready */
	414	if (!snd_hdac_chip_readb(bus, GCTL)) {
75383f8d	415	dev_dbg(bus->dev, "controller not ready!\n");
14752412 TI	416	return -EBUSY;
	417	}
	418
	419	/* Accept unsolicited responses */
081e01f0	420	snd_hdac_chip_updatel(bus, GCTL, AZX_GCTL_UNSOL, AZX_GCTL_UNSOL);
14752412 TI	421
	422	/* detect codecs */
	423	if (!bus->codec_mask) {
	424	bus->codec_mask = snd_hdac_chip_readw(bus, STATESTS);
	425	dev_dbg(bus->dev, "codec_mask = 0x%lx\n", bus->codec_mask);
	426	}
	427
	428	return 0;
	429	}
75383f8d	430	EXPORT_SYMBOL_GPL(snd_hdac_bus_reset_link);
14752412 TI	431
	432	/* enable interrupts */
	433	static void azx_int_enable(struct hdac_bus *bus)
	434	{
	435	/* enable controller CIE and GIE */
081e01f0 KJ	436	snd_hdac_chip_updatel(bus, INTCTL,
	437	AZX_INT_CTRL_EN \| AZX_INT_GLOBAL_EN,
	438	AZX_INT_CTRL_EN \| AZX_INT_GLOBAL_EN);
14752412 TI	439	}
	440
	441	/* disable interrupts */
	442	static void azx_int_disable(struct hdac_bus *bus)
	443	{
	444	struct hdac_stream *azx_dev;
	445
	446	/* disable interrupts in stream descriptor */
	447	list_for_each_entry(azx_dev, &bus->stream_list, list)
	448	snd_hdac_stream_updateb(azx_dev, SD_CTL, SD_INT_MASK, 0);
	449
	450	/* disable SIE for all streams */
	451	snd_hdac_chip_writeb(bus, INTCTL, 0);
	452
	453	/* disable controller CIE and GIE */
	454	snd_hdac_chip_updatel(bus, INTCTL, AZX_INT_CTRL_EN \| AZX_INT_GLOBAL_EN, 0);
	455	}
	456
	457	/* clear interrupts */
	458	static void azx_int_clear(struct hdac_bus *bus)
	459	{
	460	struct hdac_stream *azx_dev;
	461
	462	/* clear stream status */
	463	list_for_each_entry(azx_dev, &bus->stream_list, list)
	464	snd_hdac_stream_writeb(azx_dev, SD_STS, SD_INT_MASK);
	465
	466	/* clear STATESTS */
	467	snd_hdac_chip_writew(bus, STATESTS, STATESTS_INT_MASK);
	468
	469	/* clear rirb status */
	470	snd_hdac_chip_writeb(bus, RIRBSTS, RIRB_INT_MASK);
	471
	472	/* clear int status */
	473	snd_hdac_chip_writel(bus, INTSTS, AZX_INT_CTRL_EN \| AZX_INT_ALL_STREAM);
	474	}
	475
	476	/**
	477	* snd_hdac_bus_init_chip - reset and start the controller registers
	478	* @bus: HD-audio core bus
	479	* @full_reset: Do full reset
	480	*/
	481	bool snd_hdac_bus_init_chip(struct hdac_bus *bus, bool full_reset)
	482	{
	483	if (bus->chip_init)
	484	return false;
	485
	486	/* reset controller */
75383f8d	487	snd_hdac_bus_reset_link(bus, full_reset);
14752412	488
b61749a8	489	/* clear interrupts */
14752412	490	azx_int_clear(bus);
14752412 TI	491
	492	/* initialize the codec command I/O */
	493	snd_hdac_bus_init_cmd_io(bus);
	494
b61749a8 YZ	495	/* enable interrupts after CORB/RIRB buffers are initialized above */
	496	azx_int_enable(bus);
	497
14752412 TI	498	/* program the position buffer */
	499	if (bus->use_posbuf && bus->posbuf.addr) {
	500	snd_hdac_chip_writel(bus, DPLBASE, (u32)bus->posbuf.addr);
	501	snd_hdac_chip_writel(bus, DPUBASE, upper_32_bits(bus->posbuf.addr));
	502	}
	503
	504	bus->chip_init = true;
	505	return true;
	506	}
	507	EXPORT_SYMBOL_GPL(snd_hdac_bus_init_chip);
	508
	509	/**
	510	* snd_hdac_bus_stop_chip - disable the whole IRQ and I/Os
	511	* @bus: HD-audio core bus
	512	*/
	513	void snd_hdac_bus_stop_chip(struct hdac_bus *bus)
	514	{
	515	if (!bus->chip_init)
	516	return;
	517
	518	/* disable interrupts */
	519	azx_int_disable(bus);
	520	azx_int_clear(bus);
	521
	522	/* disable CORB/RIRB */
	523	snd_hdac_bus_stop_cmd_io(bus);
	524
	525	/* disable position buffer */
	526	if (bus->posbuf.addr) {
	527	snd_hdac_chip_writel(bus, DPLBASE, 0);
	528	snd_hdac_chip_writel(bus, DPUBASE, 0);
	529	}
	530
	531	bus->chip_init = false;
	532	}
	533	EXPORT_SYMBOL_GPL(snd_hdac_bus_stop_chip);
	534
	535	/**
	536	* snd_hdac_bus_handle_stream_irq - interrupt handler for streams
	537	* @bus: HD-audio core bus
	538	* @status: INTSTS register value
	539	* @ask: callback to be called for woken streams
473f4145 TI	540	*
473f4145 TI	541	* Returns the bits of handled streams, or zero if no stream is handled.
14752412	542	*/
473f4145	543	int snd_hdac_bus_handle_stream_irq(struct hdac_bus *bus, unsigned int status,
14752412 TI	544	void (ack)(struct hdac_bus ,
	545	struct hdac_stream *))
	546	{
	547	struct hdac_stream *azx_dev;
	548	u8 sd_status;
473f4145	549	int handled = 0;
14752412 TI	550
	551	list_for_each_entry(azx_dev, &bus->stream_list, list) {
	552	if (status & azx_dev->sd_int_sta_mask) {
	553	sd_status = snd_hdac_stream_readb(azx_dev, SD_STS);
	554	snd_hdac_stream_writeb(azx_dev, SD_STS, SD_INT_MASK);
473f4145	555	handled \|= 1 << azx_dev->index;
14752412 TI	556	if (!azx_dev->substream \|\| !azx_dev->running \|\|
	557	!(sd_status & SD_INT_COMPLETE))
	558	continue;
	559	if (ack)
	560	ack(bus, azx_dev);
	561	}
	562	}
473f4145	563	return handled;
14752412 TI	564	}
14752412 TI	565	EXPORT_SYMBOL_GPL(snd_hdac_bus_handle_stream_irq);
304dad30 JK	566
	567	/**
	568	* snd_hdac_bus_alloc_stream_pages - allocate BDL and other buffers
	569	* @bus: HD-audio core bus
	570	*
	571	* Call this after assigning the all streams.
	572	* Returns zero for success, or a negative error code.
	573	*/
	574	int snd_hdac_bus_alloc_stream_pages(struct hdac_bus *bus)
	575	{
	576	struct hdac_stream *s;
	577	int num_streams = 0;
	578	int err;
	579
	580	list_for_each_entry(s, &bus->stream_list, list) {
	581	/* allocate memory for the BDL for each stream */
	582	err = bus->io_ops->dma_alloc_pages(bus, SNDRV_DMA_TYPE_DEV,
	583	BDL_SIZE, &s->bdl);
	584	num_streams++;
	585	if (err < 0)
	586	return -ENOMEM;
	587	}
	588
	589	if (WARN_ON(!num_streams))
	590	return -EINVAL;
	591	/* allocate memory for the position buffer */
	592	err = bus->io_ops->dma_alloc_pages(bus, SNDRV_DMA_TYPE_DEV,
	593	num_streams * 8, &bus->posbuf);
	594	if (err < 0)
	595	return -ENOMEM;
	596	list_for_each_entry(s, &bus->stream_list, list)
	597	s->posbuf = (__le32 )(bus->posbuf.area + s->index 8);
	598
	599	/* single page (at least 4096 bytes) must suffice for both ringbuffes */
	600	return bus->io_ops->dma_alloc_pages(bus, SNDRV_DMA_TYPE_DEV,
	601	PAGE_SIZE, &bus->rb);
	602	}
	603	EXPORT_SYMBOL_GPL(snd_hdac_bus_alloc_stream_pages);
	604
	605	/**
	606	* snd_hdac_bus_free_stream_pages - release BDL and other buffers
	607	* @bus: HD-audio core bus
	608	*/
	609	void snd_hdac_bus_free_stream_pages(struct hdac_bus *bus)
	610	{
	611	struct hdac_stream *s;
	612
	613	list_for_each_entry(s, &bus->stream_list, list) {
	614	if (s->bdl.area)
	615	bus->io_ops->dma_free_pages(bus, &s->bdl);
	616	}
	617
	618	if (bus->rb.area)
	619	bus->io_ops->dma_free_pages(bus, &bus->rb);
	620	if (bus->posbuf.area)
	621	bus->io_ops->dma_free_pages(bus, &bus->posbuf);
	622	}
	623	EXPORT_SYMBOL_GPL(snd_hdac_bus_free_stream_pages);