diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/dma/omap-dma.c | 121 |
1 files changed, 115 insertions, 6 deletions
diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c index 00f8e566cf12..ec98e718de70 100644 --- a/drivers/dma/omap-dma.c +++ b/drivers/dma/omap-dma.c @@ -30,6 +30,10 @@ struct omap_dmadev { void __iomem *base; const struct omap_dma_reg *reg_map; struct omap_system_dma_plat_info *plat; + bool legacy; + spinlock_t irq_lock; + uint32_t irq_enable_mask; + struct omap_chan *lch_map[32]; }; struct omap_chan { @@ -254,10 +258,22 @@ static void omap_dma_clear_csr(struct omap_chan *c) omap_dma_chan_write(c, CSR, ~0); } +static unsigned omap_dma_get_csr(struct omap_chan *c) +{ + unsigned val = omap_dma_chan_read(c, CSR); + + if (!dma_omap1()) + omap_dma_chan_write(c, CSR, val); + + return val; +} + static void omap_dma_assign(struct omap_dmadev *od, struct omap_chan *c, unsigned lch) { c->channel_base = od->base + od->plat->channel_stride * lch; + + od->lch_map[lch] = c; } static void omap_dma_start(struct omap_chan *c, struct omap_desc *d) @@ -460,32 +476,103 @@ static void omap_dma_sched(unsigned long data) } } +static irqreturn_t omap_dma_irq(int irq, void *devid) +{ + struct omap_dmadev *od = devid; + unsigned status, channel; + + spin_lock(&od->irq_lock); + + status = omap_dma_glbl_read(od, IRQSTATUS_L1); + status &= od->irq_enable_mask; + if (status == 0) { + spin_unlock(&od->irq_lock); + return IRQ_NONE; + } + + while ((channel = ffs(status)) != 0) { + unsigned mask, csr; + struct omap_chan *c; + + channel -= 1; + mask = BIT(channel); + status &= ~mask; + + c = od->lch_map[channel]; + if (c == NULL) { + /* This should never happen */ + dev_err(od->ddev.dev, "invalid channel %u\n", channel); + continue; + } + + csr = omap_dma_get_csr(c); + omap_dma_glbl_write(od, IRQSTATUS_L1, mask); + + omap_dma_callback(channel, csr, c); + } + + spin_unlock(&od->irq_lock); + + return IRQ_HANDLED; +} + static int omap_dma_alloc_chan_resources(struct dma_chan *chan) { struct omap_dmadev *od = to_omap_dma_dev(chan->device); struct omap_chan *c = to_omap_dma_chan(chan); int ret; - dev_dbg(od->ddev.dev, "allocating channel for %u\n", c->dma_sig); + if (od->legacy) { + ret = omap_request_dma(c->dma_sig, "DMA engine", + omap_dma_callback, c, &c->dma_ch); + } else { + ret = omap_request_dma(c->dma_sig, "DMA engine", NULL, NULL, + &c->dma_ch); + } - ret = omap_request_dma(c->dma_sig, "DMA engine", omap_dma_callback, - c, &c->dma_ch); + dev_dbg(od->ddev.dev, "allocating channel %u for %u\n", + c->dma_ch, c->dma_sig); - if (ret >= 0) + if (ret >= 0) { omap_dma_assign(od, c, c->dma_ch); + if (!od->legacy) { + unsigned val; + + spin_lock_irq(&od->irq_lock); + val = BIT(c->dma_ch); + omap_dma_glbl_write(od, IRQSTATUS_L1, val); + od->irq_enable_mask |= val; + omap_dma_glbl_write(od, IRQENABLE_L1, od->irq_enable_mask); + + val = omap_dma_glbl_read(od, IRQENABLE_L0); + val &= ~BIT(c->dma_ch); + omap_dma_glbl_write(od, IRQENABLE_L0, val); + spin_unlock_irq(&od->irq_lock); + } + } + return ret; } static void omap_dma_free_chan_resources(struct dma_chan *chan) { + struct omap_dmadev *od = to_omap_dma_dev(chan->device); struct omap_chan *c = to_omap_dma_chan(chan); + if (!od->legacy) { + spin_lock_irq(&od->irq_lock); + od->irq_enable_mask &= ~BIT(c->dma_ch); + omap_dma_glbl_write(od, IRQENABLE_L1, od->irq_enable_mask); + spin_unlock_irq(&od->irq_lock); + } + c->channel_base = NULL; + od->lch_map[c->dma_ch] = NULL; vchan_free_chan_resources(&c->vc); omap_free_dma(c->dma_ch); - dev_dbg(c->vc.chan.device->dev, "freeing channel for %u\n", c->dma_sig); + dev_dbg(od->ddev.dev, "freeing channel for %u\n", c->dma_sig); } static size_t omap_dma_sg_size(struct omap_sg *sg) @@ -1015,7 +1102,7 @@ static int omap_dma_probe(struct platform_device *pdev) { struct omap_dmadev *od; struct resource *res; - int rc, i; + int rc, i, irq; od = devm_kzalloc(&pdev->dev, sizeof(*od), GFP_KERNEL); if (!od) @@ -1045,6 +1132,7 @@ static int omap_dma_probe(struct platform_device *pdev) INIT_LIST_HEAD(&od->ddev.channels); INIT_LIST_HEAD(&od->pending); spin_lock_init(&od->lock); + spin_lock_init(&od->irq_lock); tasklet_init(&od->task, omap_dma_sched, (unsigned long)od); @@ -1056,6 +1144,21 @@ static int omap_dma_probe(struct platform_device *pdev) } } + irq = platform_get_irq(pdev, 1); + if (irq <= 0) { + dev_info(&pdev->dev, "failed to get L1 IRQ: %d\n", irq); + od->legacy = true; + } else { + /* Disable all interrupts */ + od->irq_enable_mask = 0; + omap_dma_glbl_write(od, IRQENABLE_L1, 0); + + rc = devm_request_irq(&pdev->dev, irq, omap_dma_irq, + IRQF_SHARED, "omap-dma-engine", od); + if (rc) + return rc; + } + rc = dma_async_device_register(&od->ddev); if (rc) { pr_warn("OMAP-DMA: failed to register slave DMA engine device: %d\n", @@ -1092,6 +1195,12 @@ static int omap_dma_remove(struct platform_device *pdev) of_dma_controller_free(pdev->dev.of_node); dma_async_device_unregister(&od->ddev); + + if (!od->legacy) { + /* Disable all interrupts */ + omap_dma_glbl_write(od, IRQENABLE_L0, 0); + } + omap_dma_free(od); return 0; |