![Linus Torvalds](/assets/img/avatar_default.png)
Pull DMA mask updates from Russell King: "This series cleans up the handling of DMA masks in a lot of drivers, fixing some bugs as we go. Some of the more serious errors include: - drivers which only set their coherent DMA mask if the attempt to set the streaming mask fails. - drivers which test for a NULL dma mask pointer, and then set the dma mask pointer to a location in their module .data section - which will cause problems if the module is reloaded. To counter these, I have introduced two helper functions: - dma_set_mask_and_coherent() takes care of setting both the streaming and coherent masks at the same time, with the correct error handling as specified by the API. - dma_coerce_mask_and_coherent() which resolves the problem of drivers forcefully setting DMA masks. This is more a marker for future work to further clean these locations up - the code which creates the devices really should be initialising these, but to fix that in one go along with this change could potentially be very disruptive. The last thing this series does is prise away some of Linux's addition to "DMA addresses are physical addresses and RAM always starts at zero". We have ARM LPAE systems where all system memory is above 4GB physical, hence having DMA masks interpreted by (eg) the block layers as describing physical addresses in the range 0..DMAMASK fails on these platforms. Santosh Shilimkar addresses this in this series; the patches were copied to the appropriate people multiple times but were ignored. Fixing this also gets rid of some ARM weirdness in the setup of the max*pfn variables, and brings ARM into line with every other Linux architecture as far as those go" * 'for-linus-dma-masks' of git://git.linaro.org/people/rmk/linux-arm: (52 commits) ARM: 7805/1: mm: change max*pfn to include the physical offset of memory ARM: 7797/1: mmc: Use dma_max_pfn(dev) helper for bounce_limit calculations ARM: 7796/1: scsi: Use dma_max_pfn(dev) helper for bounce_limit calculations ARM: 7795/1: mm: dma-mapping: Add dma_max_pfn(dev) helper function ARM: 7794/1: block: Rename parameter dma_mask to max_addr for blk_queue_bounce_limit() ARM: DMA-API: better handing of DMA masks for coherent allocations ARM: 7857/1: dma: imx-sdma: setup dma mask DMA-API: firmware/google/gsmi.c: avoid direct access to DMA masks DMA-API: dcdbas: update DMA mask handing DMA-API: dma: edma.c: no need to explicitly initialize DMA masks DMA-API: usb: musb: use platform_device_register_full() to avoid directly messing with dma masks DMA-API: crypto: remove last references to 'static struct device *dev' DMA-API: crypto: fix ixp4xx crypto platform device support DMA-API: others: use dma_set_coherent_mask() DMA-API: staging: use dma_set_coherent_mask() DMA-API: usb: use new dma_coerce_mask_and_coherent() DMA-API: usb: use dma_set_coherent_mask() DMA-API: parport: parport_pc.c: use dma_coerce_mask_and_coherent() DMA-API: net: octeon: use dma_coerce_mask_and_coherent() DMA-API: net: nxp/lpc_eth: use dma_coerce_mask_and_coherent() ...
519 lines
14 KiB
C
519 lines
14 KiB
C
/*
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* Freescale MPC5200 PSC DMA
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* ALSA SoC Platform driver
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*
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* Copyright (C) 2008 Secret Lab Technologies Ltd.
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* Copyright (C) 2009 Jon Smirl, Digispeaker
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*/
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/slab.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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#include <sound/soc.h>
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#include <linux/fsl/bestcomm/bestcomm.h>
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#include <linux/fsl/bestcomm/gen_bd.h>
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#include <asm/mpc52xx_psc.h>
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#include "mpc5200_dma.h"
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/*
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* Interrupt handlers
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*/
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static irqreturn_t psc_dma_status_irq(int irq, void *_psc_dma)
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{
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struct psc_dma *psc_dma = _psc_dma;
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struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
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u16 isr;
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isr = in_be16(®s->mpc52xx_psc_isr);
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/* Playback underrun error */
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if (psc_dma->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP))
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psc_dma->stats.underrun_count++;
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/* Capture overrun error */
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if (psc_dma->capture.active && (isr & MPC52xx_PSC_IMR_ORERR))
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psc_dma->stats.overrun_count++;
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out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT);
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return IRQ_HANDLED;
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}
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/**
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* psc_dma_bcom_enqueue_next_buffer - Enqueue another audio buffer
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* @s: pointer to stream private data structure
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*
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* Enqueues another audio period buffer into the bestcomm queue.
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*
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* Note: The routine must only be called when there is space available in
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* the queue. Otherwise the enqueue will fail and the audio ring buffer
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* will get out of sync
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*/
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static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s)
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{
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struct bcom_bd *bd;
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/* Prepare and enqueue the next buffer descriptor */
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bd = bcom_prepare_next_buffer(s->bcom_task);
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bd->status = s->period_bytes;
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bd->data[0] = s->runtime->dma_addr + (s->period_next * s->period_bytes);
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bcom_submit_next_buffer(s->bcom_task, NULL);
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/* Update for next period */
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s->period_next = (s->period_next + 1) % s->runtime->periods;
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}
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/* Bestcomm DMA irq handler */
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static irqreturn_t psc_dma_bcom_irq(int irq, void *_psc_dma_stream)
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{
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struct psc_dma_stream *s = _psc_dma_stream;
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spin_lock(&s->psc_dma->lock);
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/* For each finished period, dequeue the completed period buffer
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* and enqueue a new one in it's place. */
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while (bcom_buffer_done(s->bcom_task)) {
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bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
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s->period_current = (s->period_current+1) % s->runtime->periods;
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s->period_count++;
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psc_dma_bcom_enqueue_next_buffer(s);
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}
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spin_unlock(&s->psc_dma->lock);
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/* If the stream is active, then also inform the PCM middle layer
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* of the period finished event. */
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if (s->active)
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snd_pcm_period_elapsed(s->stream);
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return IRQ_HANDLED;
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}
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static int psc_dma_hw_free(struct snd_pcm_substream *substream)
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{
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snd_pcm_set_runtime_buffer(substream, NULL);
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return 0;
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}
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/**
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* psc_dma_trigger: start and stop the DMA transfer.
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*
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* This function is called by ALSA to start, stop, pause, and resume the DMA
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* transfer of data.
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*/
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static int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
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struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
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u16 imr;
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unsigned long flags;
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int i;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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dev_dbg(psc_dma->dev, "START: stream=%i fbits=%u ps=%u #p=%u\n",
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substream->pstr->stream, runtime->frame_bits,
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(int)runtime->period_size, runtime->periods);
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s->period_bytes = frames_to_bytes(runtime,
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runtime->period_size);
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s->period_next = 0;
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s->period_current = 0;
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s->active = 1;
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s->period_count = 0;
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s->runtime = runtime;
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/* Fill up the bestcomm bd queue and enable DMA.
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* This will begin filling the PSC's fifo.
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*/
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spin_lock_irqsave(&psc_dma->lock, flags);
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if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
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bcom_gen_bd_rx_reset(s->bcom_task);
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else
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bcom_gen_bd_tx_reset(s->bcom_task);
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for (i = 0; i < runtime->periods; i++)
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if (!bcom_queue_full(s->bcom_task))
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psc_dma_bcom_enqueue_next_buffer(s);
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bcom_enable(s->bcom_task);
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spin_unlock_irqrestore(&psc_dma->lock, flags);
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out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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dev_dbg(psc_dma->dev, "STOP: stream=%i periods_count=%i\n",
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substream->pstr->stream, s->period_count);
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s->active = 0;
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spin_lock_irqsave(&psc_dma->lock, flags);
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bcom_disable(s->bcom_task);
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if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
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bcom_gen_bd_rx_reset(s->bcom_task);
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else
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bcom_gen_bd_tx_reset(s->bcom_task);
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spin_unlock_irqrestore(&psc_dma->lock, flags);
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break;
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default:
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dev_dbg(psc_dma->dev, "unhandled trigger: stream=%i cmd=%i\n",
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substream->pstr->stream, cmd);
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return -EINVAL;
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}
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/* Update interrupt enable settings */
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imr = 0;
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if (psc_dma->playback.active)
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imr |= MPC52xx_PSC_IMR_TXEMP;
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if (psc_dma->capture.active)
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imr |= MPC52xx_PSC_IMR_ORERR;
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out_be16(®s->isr_imr.imr, psc_dma->imr | imr);
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return 0;
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}
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/* ---------------------------------------------------------------------
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* The PSC DMA 'ASoC platform' driver
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*
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* Can be referenced by an 'ASoC machine' driver
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* This driver only deals with the audio bus; it doesn't have any
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* interaction with the attached codec
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*/
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static const struct snd_pcm_hardware psc_dma_hardware = {
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.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_BATCH,
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.formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE |
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SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE,
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.rate_min = 8000,
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.rate_max = 48000,
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.channels_min = 1,
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.channels_max = 2,
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.period_bytes_max = 1024 * 1024,
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.period_bytes_min = 32,
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.periods_min = 2,
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.periods_max = 256,
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.buffer_bytes_max = 2 * 1024 * 1024,
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.fifo_size = 512,
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};
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static int psc_dma_open(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
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struct psc_dma_stream *s;
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int rc;
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dev_dbg(psc_dma->dev, "psc_dma_open(substream=%p)\n", substream);
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if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
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s = &psc_dma->capture;
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else
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s = &psc_dma->playback;
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snd_soc_set_runtime_hwparams(substream, &psc_dma_hardware);
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rc = snd_pcm_hw_constraint_integer(runtime,
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SNDRV_PCM_HW_PARAM_PERIODS);
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if (rc < 0) {
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dev_err(substream->pcm->card->dev, "invalid buffer size\n");
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return rc;
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}
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s->stream = substream;
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return 0;
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}
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static int psc_dma_close(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
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struct psc_dma_stream *s;
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dev_dbg(psc_dma->dev, "psc_dma_close(substream=%p)\n", substream);
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if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
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s = &psc_dma->capture;
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else
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s = &psc_dma->playback;
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if (!psc_dma->playback.active &&
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!psc_dma->capture.active) {
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/* Disable all interrupts and reset the PSC */
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out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
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out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */
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}
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s->stream = NULL;
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return 0;
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}
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static snd_pcm_uframes_t
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psc_dma_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
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struct psc_dma_stream *s;
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dma_addr_t count;
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if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
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s = &psc_dma->capture;
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else
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s = &psc_dma->playback;
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count = s->period_current * s->period_bytes;
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return bytes_to_frames(substream->runtime, count);
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}
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static int
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psc_dma_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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return 0;
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}
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static struct snd_pcm_ops psc_dma_ops = {
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.open = psc_dma_open,
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.close = psc_dma_close,
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.hw_free = psc_dma_hw_free,
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.ioctl = snd_pcm_lib_ioctl,
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.pointer = psc_dma_pointer,
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.trigger = psc_dma_trigger,
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.hw_params = psc_dma_hw_params,
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};
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static int psc_dma_new(struct snd_soc_pcm_runtime *rtd)
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{
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struct snd_card *card = rtd->card->snd_card;
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struct snd_soc_dai *dai = rtd->cpu_dai;
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struct snd_pcm *pcm = rtd->pcm;
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struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
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size_t size = psc_dma_hardware.buffer_bytes_max;
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int rc;
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dev_dbg(rtd->platform->dev, "psc_dma_new(card=%p, dai=%p, pcm=%p)\n",
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card, dai, pcm);
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rc = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
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if (rc)
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return rc;
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if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
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rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
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size, &pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer);
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if (rc)
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goto playback_alloc_err;
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}
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if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
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rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
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size, &pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->dma_buffer);
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if (rc)
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goto capture_alloc_err;
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}
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if (rtd->codec->ac97)
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rtd->codec->ac97->private_data = psc_dma;
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return 0;
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capture_alloc_err:
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if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
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snd_dma_free_pages(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer);
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playback_alloc_err:
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dev_err(card->dev, "Cannot allocate buffer(s)\n");
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return -ENOMEM;
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}
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static void psc_dma_free(struct snd_pcm *pcm)
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{
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struct snd_soc_pcm_runtime *rtd = pcm->private_data;
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struct snd_pcm_substream *substream;
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int stream;
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dev_dbg(rtd->platform->dev, "psc_dma_free(pcm=%p)\n", pcm);
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for (stream = 0; stream < 2; stream++) {
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substream = pcm->streams[stream].substream;
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if (substream) {
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snd_dma_free_pages(&substream->dma_buffer);
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substream->dma_buffer.area = NULL;
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substream->dma_buffer.addr = 0;
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}
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}
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}
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static struct snd_soc_platform_driver mpc5200_audio_dma_platform = {
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.ops = &psc_dma_ops,
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.pcm_new = &psc_dma_new,
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.pcm_free = &psc_dma_free,
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};
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int mpc5200_audio_dma_create(struct platform_device *op)
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{
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phys_addr_t fifo;
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struct psc_dma *psc_dma;
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struct resource res;
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int size, irq, rc;
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const __be32 *prop;
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void __iomem *regs;
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int ret;
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/* Fetch the registers and IRQ of the PSC */
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irq = irq_of_parse_and_map(op->dev.of_node, 0);
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if (of_address_to_resource(op->dev.of_node, 0, &res)) {
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dev_err(&op->dev, "Missing reg property\n");
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return -ENODEV;
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}
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regs = ioremap(res.start, resource_size(&res));
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if (!regs) {
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dev_err(&op->dev, "Could not map registers\n");
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return -ENODEV;
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}
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/* Allocate and initialize the driver private data */
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psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL);
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if (!psc_dma) {
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ret = -ENOMEM;
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goto out_unmap;
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}
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/* Get the PSC ID */
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prop = of_get_property(op->dev.of_node, "cell-index", &size);
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if (!prop || size < sizeof *prop) {
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ret = -ENODEV;
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goto out_free;
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}
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spin_lock_init(&psc_dma->lock);
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mutex_init(&psc_dma->mutex);
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psc_dma->id = be32_to_cpu(*prop);
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psc_dma->irq = irq;
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psc_dma->psc_regs = regs;
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psc_dma->fifo_regs = regs + sizeof *psc_dma->psc_regs;
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psc_dma->dev = &op->dev;
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psc_dma->playback.psc_dma = psc_dma;
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psc_dma->capture.psc_dma = psc_dma;
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snprintf(psc_dma->name, sizeof psc_dma->name, "PSC%u", psc_dma->id);
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/* Find the address of the fifo data registers and setup the
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* DMA tasks */
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fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32);
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psc_dma->capture.bcom_task =
|
|
bcom_psc_gen_bd_rx_init(psc_dma->id, 10, fifo, 512);
|
|
psc_dma->playback.bcom_task =
|
|
bcom_psc_gen_bd_tx_init(psc_dma->id, 10, fifo);
|
|
if (!psc_dma->capture.bcom_task ||
|
|
!psc_dma->playback.bcom_task) {
|
|
dev_err(&op->dev, "Could not allocate bestcomm tasks\n");
|
|
ret = -ENODEV;
|
|
goto out_free;
|
|
}
|
|
|
|
/* Disable all interrupts and reset the PSC */
|
|
out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
|
|
/* reset receiver */
|
|
out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_RX);
|
|
/* reset transmitter */
|
|
out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_TX);
|
|
/* reset error */
|
|
out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_ERR_STAT);
|
|
/* reset mode */
|
|
out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_SEL_MODE_REG_1);
|
|
|
|
/* Set up mode register;
|
|
* First write: RxRdy (FIFO Alarm) generates rx FIFO irq
|
|
* Second write: register Normal mode for non loopback
|
|
*/
|
|
out_8(&psc_dma->psc_regs->mode, 0);
|
|
out_8(&psc_dma->psc_regs->mode, 0);
|
|
|
|
/* Set the TX and RX fifo alarm thresholds */
|
|
out_be16(&psc_dma->fifo_regs->rfalarm, 0x100);
|
|
out_8(&psc_dma->fifo_regs->rfcntl, 0x4);
|
|
out_be16(&psc_dma->fifo_regs->tfalarm, 0x100);
|
|
out_8(&psc_dma->fifo_regs->tfcntl, 0x7);
|
|
|
|
/* Lookup the IRQ numbers */
|
|
psc_dma->playback.irq =
|
|
bcom_get_task_irq(psc_dma->playback.bcom_task);
|
|
psc_dma->capture.irq =
|
|
bcom_get_task_irq(psc_dma->capture.bcom_task);
|
|
|
|
rc = request_irq(psc_dma->irq, &psc_dma_status_irq, IRQF_SHARED,
|
|
"psc-dma-status", psc_dma);
|
|
rc |= request_irq(psc_dma->capture.irq, &psc_dma_bcom_irq, IRQF_SHARED,
|
|
"psc-dma-capture", &psc_dma->capture);
|
|
rc |= request_irq(psc_dma->playback.irq, &psc_dma_bcom_irq, IRQF_SHARED,
|
|
"psc-dma-playback", &psc_dma->playback);
|
|
if (rc) {
|
|
ret = -ENODEV;
|
|
goto out_irq;
|
|
}
|
|
|
|
/* Save what we've done so it can be found again later */
|
|
dev_set_drvdata(&op->dev, psc_dma);
|
|
|
|
/* Tell the ASoC OF helpers about it */
|
|
return snd_soc_register_platform(&op->dev, &mpc5200_audio_dma_platform);
|
|
out_irq:
|
|
free_irq(psc_dma->irq, psc_dma);
|
|
free_irq(psc_dma->capture.irq, &psc_dma->capture);
|
|
free_irq(psc_dma->playback.irq, &psc_dma->playback);
|
|
out_free:
|
|
kfree(psc_dma);
|
|
out_unmap:
|
|
iounmap(regs);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mpc5200_audio_dma_create);
|
|
|
|
int mpc5200_audio_dma_destroy(struct platform_device *op)
|
|
{
|
|
struct psc_dma *psc_dma = dev_get_drvdata(&op->dev);
|
|
|
|
dev_dbg(&op->dev, "mpc5200_audio_dma_destroy()\n");
|
|
|
|
snd_soc_unregister_platform(&op->dev);
|
|
|
|
bcom_gen_bd_rx_release(psc_dma->capture.bcom_task);
|
|
bcom_gen_bd_tx_release(psc_dma->playback.bcom_task);
|
|
|
|
/* Release irqs */
|
|
free_irq(psc_dma->irq, psc_dma);
|
|
free_irq(psc_dma->capture.irq, &psc_dma->capture);
|
|
free_irq(psc_dma->playback.irq, &psc_dma->playback);
|
|
|
|
iounmap(psc_dma->psc_regs);
|
|
kfree(psc_dma);
|
|
dev_set_drvdata(&op->dev, NULL);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mpc5200_audio_dma_destroy);
|
|
|
|
MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
|
|
MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver");
|
|
MODULE_LICENSE("GPL");
|