linux/sound/hda/hdac_controller.c

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/*
* 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)
{
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);
/**
* 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);
/* 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++) {
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);
/*
* 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, 0, 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 */
static int azx_reset(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, "azx_reset: controller not ready!\n");
return -EBUSY;
}
/* Accept unsolicited responses */
snd_hdac_chip_updatel(bus, GCTL, 0, 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;
}
/* enable interrupts */
static void azx_int_enable(struct hdac_bus *bus)
{
/* enable controller CIE and GIE */
snd_hdac_chip_updatel(bus, INTCTL, 0, 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 */
azx_reset(bus, full_reset);
/* initialize interrupts */
azx_int_clear(bus);
azx_int_enable(bus);
/* initialize the codec command I/O */
snd_hdac_bus_init_cmd_io(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
*/
void 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;
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);
if (!azx_dev->substream || !azx_dev->running ||
!(sd_status & SD_INT_COMPLETE))
continue;
if (ack)
ack(bus, azx_dev);
}
}
}
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);