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Release 4.7 sound/hda/hdac_controller.c

Directory: sound/hda
/*
 * 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)); }

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/** * 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); }

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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); }

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

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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; }

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/** * 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; }

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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]); } } }

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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; }

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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); }

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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); }

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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; }

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/* 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); }

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/* 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); }

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/* 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); }

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/** * 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; }

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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; }

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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; }

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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); }

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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); }

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EXPORT_SYMBOL_GPL(snd_hdac_bus_free_stream_pages);

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Directory: sound/hda
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