// SPDX-License-Identifier: GPL-2.0-or-later /* * drivers/dma/fsl-edma.c * * Copyright 2013-2014 Freescale Semiconductor, Inc. * * Driver for the Freescale eDMA engine with flexible channel multiplexing * capability for DMA request sources. The eDMA block can be found on some * Vybrid and Layerscape SoCs. */ #include #include #include #include #include #include #include #include #include #include #include #include "fsl-edma-common.h" static void fsl_edma_synchronize(struct dma_chan *chan) { struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); vchan_synchronize(&fsl_chan->vchan); } static irqreturn_t fsl_edma_tx_handler(int irq, void *dev_id) { struct fsl_edma_engine *fsl_edma = dev_id; unsigned int intr, ch; struct edma_regs *regs = &fsl_edma->regs; intr = edma_readl(fsl_edma, regs->intl); if (!intr) return IRQ_NONE; for (ch = 0; ch < fsl_edma->n_chans; ch++) { if (intr & (0x1 << ch)) { edma_writeb(fsl_edma, EDMA_CINT_CINT(ch), regs->cint); fsl_edma_tx_chan_handler(&fsl_edma->chans[ch]); } } return IRQ_HANDLED; } static irqreturn_t fsl_edma3_tx_handler(int irq, void *dev_id) { struct fsl_edma_chan *fsl_chan = dev_id; unsigned int intr; intr = edma_readl_chreg(fsl_chan, ch_int); if (!intr) return IRQ_HANDLED; edma_writel_chreg(fsl_chan, 1, ch_int); fsl_edma_tx_chan_handler(fsl_chan); return IRQ_HANDLED; } static irqreturn_t fsl_edma_err_handler(int irq, void *dev_id) { struct fsl_edma_engine *fsl_edma = dev_id; unsigned int err, ch; struct edma_regs *regs = &fsl_edma->regs; err = edma_readl(fsl_edma, regs->errl); if (!err) return IRQ_NONE; for (ch = 0; ch < fsl_edma->n_chans; ch++) { if (err & (0x1 << ch)) { fsl_edma_disable_request(&fsl_edma->chans[ch]); edma_writeb(fsl_edma, EDMA_CERR_CERR(ch), regs->cerr); fsl_edma_err_chan_handler(&fsl_edma->chans[ch]); } } return IRQ_HANDLED; } static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id) { if (fsl_edma_tx_handler(irq, dev_id) == IRQ_HANDLED) return IRQ_HANDLED; return fsl_edma_err_handler(irq, dev_id); } static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec, struct of_dma *ofdma) { struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data; struct dma_chan *chan, *_chan; struct fsl_edma_chan *fsl_chan; u32 dmamux_nr = fsl_edma->drvdata->dmamuxs; unsigned long chans_per_mux = fsl_edma->n_chans / dmamux_nr; if (dma_spec->args_count != 2) return NULL; guard(mutex)(&fsl_edma->fsl_edma_mutex); list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) { if (chan->client_count) continue; if ((chan->chan_id / chans_per_mux) == dma_spec->args[0]) { chan = dma_get_slave_channel(chan); if (chan) { chan->device->privatecnt++; fsl_chan = to_fsl_edma_chan(chan); fsl_chan->srcid = dma_spec->args[1]; if (!fsl_chan->srcid) { dev_err(&fsl_chan->pdev->dev, "Invalidate srcid %d\n", fsl_chan->srcid); return NULL; } fsl_edma_chan_mux(fsl_chan, fsl_chan->srcid, true); return chan; } } } return NULL; } static struct dma_chan *fsl_edma3_xlate(struct of_phandle_args *dma_spec, struct of_dma *ofdma) { struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data; struct dma_chan *chan, *_chan; struct fsl_edma_chan *fsl_chan; bool b_chmux; int i; if (dma_spec->args_count != 3) return NULL; b_chmux = !!(fsl_edma->drvdata->flags & FSL_EDMA_DRV_HAS_CHMUX); mutex_lock(&fsl_edma->fsl_edma_mutex); list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) { if (chan->client_count) continue; fsl_chan = to_fsl_edma_chan(chan); i = fsl_chan - fsl_edma->chans; fsl_chan->priority = dma_spec->args[1]; fsl_chan->is_rxchan = dma_spec->args[2] & FSL_EDMA_RX; fsl_chan->is_remote = dma_spec->args[2] & FSL_EDMA_REMOTE; fsl_chan->is_multi_fifo = dma_spec->args[2] & FSL_EDMA_MULTI_FIFO; if ((dma_spec->args[2] & FSL_EDMA_EVEN_CH) && (i & 0x1)) continue; if ((dma_spec->args[2] & FSL_EDMA_ODD_CH) && !(i & 0x1)) continue; if (!b_chmux && i == dma_spec->args[0]) { chan = dma_get_slave_channel(chan); chan->device->privatecnt++; mutex_unlock(&fsl_edma->fsl_edma_mutex); return chan; } else if (b_chmux && !fsl_chan->srcid) { /* if controller support channel mux, choose a free channel */ chan = dma_get_slave_channel(chan); chan->device->privatecnt++; fsl_chan->srcid = dma_spec->args[0]; mutex_unlock(&fsl_edma->fsl_edma_mutex); return chan; } } mutex_unlock(&fsl_edma->fsl_edma_mutex); return NULL; } static int fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma) { int ret; edma_writel(fsl_edma, ~0, fsl_edma->regs.intl); fsl_edma->txirq = platform_get_irq_byname(pdev, "edma-tx"); if (fsl_edma->txirq < 0) return fsl_edma->txirq; fsl_edma->errirq = platform_get_irq_byname(pdev, "edma-err"); if (fsl_edma->errirq < 0) return fsl_edma->errirq; if (fsl_edma->txirq == fsl_edma->errirq) { ret = devm_request_irq(&pdev->dev, fsl_edma->txirq, fsl_edma_irq_handler, 0, "eDMA", fsl_edma); if (ret) { dev_err(&pdev->dev, "Can't register eDMA IRQ.\n"); return ret; } } else { ret = devm_request_irq(&pdev->dev, fsl_edma->txirq, fsl_edma_tx_handler, 0, "eDMA tx", fsl_edma); if (ret) { dev_err(&pdev->dev, "Can't register eDMA tx IRQ.\n"); return ret; } ret = devm_request_irq(&pdev->dev, fsl_edma->errirq, fsl_edma_err_handler, 0, "eDMA err", fsl_edma); if (ret) { dev_err(&pdev->dev, "Can't register eDMA err IRQ.\n"); return ret; } } return 0; } static int fsl_edma3_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma) { int ret; int i; for (i = 0; i < fsl_edma->n_chans; i++) { struct fsl_edma_chan *fsl_chan = &fsl_edma->chans[i]; if (fsl_edma->chan_masked & BIT(i)) continue; /* request channel irq */ fsl_chan->txirq = platform_get_irq(pdev, i); if (fsl_chan->txirq < 0) return -EINVAL; ret = devm_request_irq(&pdev->dev, fsl_chan->txirq, fsl_edma3_tx_handler, IRQF_SHARED, fsl_chan->chan_name, fsl_chan); if (ret) { dev_err(&pdev->dev, "Can't register chan%d's IRQ.\n", i); return -EINVAL; } } return 0; } static int fsl_edma2_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma) { int i, ret, irq; int count; edma_writel(fsl_edma, ~0, fsl_edma->regs.intl); count = platform_irq_count(pdev); dev_dbg(&pdev->dev, "%s Found %d interrupts\r\n", __func__, count); if (count <= 2) { dev_err(&pdev->dev, "Interrupts in DTS not correct.\n"); return -EINVAL; } /* * 16 channel independent interrupts + 1 error interrupt on i.mx7ulp. * 2 channel share one interrupt, for example, ch0/ch16, ch1/ch17... * For now, just simply request irq without IRQF_SHARED flag, since 16 * channels are enough on i.mx7ulp whose M4 domain own some peripherals. */ for (i = 0; i < count; i++) { irq = platform_get_irq(pdev, i); if (irq < 0) return -ENXIO; /* The last IRQ is for eDMA err */ if (i == count - 1) ret = devm_request_irq(&pdev->dev, irq, fsl_edma_err_handler, 0, "eDMA2-ERR", fsl_edma); else ret = devm_request_irq(&pdev->dev, irq, fsl_edma_tx_handler, 0, fsl_edma->chans[i].chan_name, fsl_edma); if (ret) return ret; } return 0; } static void fsl_edma_irq_exit( struct platform_device *pdev, struct fsl_edma_engine *fsl_edma) { if (fsl_edma->txirq == fsl_edma->errirq) { devm_free_irq(&pdev->dev, fsl_edma->txirq, fsl_edma); } else { devm_free_irq(&pdev->dev, fsl_edma->txirq, fsl_edma); devm_free_irq(&pdev->dev, fsl_edma->errirq, fsl_edma); } } static void fsl_disable_clocks(struct fsl_edma_engine *fsl_edma, int nr_clocks) { int i; for (i = 0; i < nr_clocks; i++) clk_disable_unprepare(fsl_edma->muxclk[i]); } static struct fsl_edma_drvdata vf610_data = { .dmamuxs = DMAMUX_NR, .flags = FSL_EDMA_DRV_WRAP_IO, .chreg_off = EDMA_TCD, .chreg_space_sz = sizeof(struct fsl_edma_hw_tcd), .setup_irq = fsl_edma_irq_init, }; static struct fsl_edma_drvdata ls1028a_data = { .dmamuxs = DMAMUX_NR, .flags = FSL_EDMA_DRV_MUX_SWAP | FSL_EDMA_DRV_WRAP_IO, .chreg_off = EDMA_TCD, .chreg_space_sz = sizeof(struct fsl_edma_hw_tcd), .setup_irq = fsl_edma_irq_init, }; static struct fsl_edma_drvdata imx7ulp_data = { .dmamuxs = 1, .chreg_off = EDMA_TCD, .chreg_space_sz = sizeof(struct fsl_edma_hw_tcd), .flags = FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_CONFIG32, .setup_irq = fsl_edma2_irq_init, }; static struct fsl_edma_drvdata imx8qm_data = { .flags = FSL_EDMA_DRV_HAS_PD | FSL_EDMA_DRV_EDMA3 | FSL_EDMA_DRV_MEM_REMOTE, .chreg_space_sz = 0x10000, .chreg_off = 0x10000, .setup_irq = fsl_edma3_irq_init, }; static struct fsl_edma_drvdata imx8ulp_data = { .flags = FSL_EDMA_DRV_HAS_CHMUX | FSL_EDMA_DRV_HAS_CHCLK | FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_EDMA3, .chreg_space_sz = 0x10000, .chreg_off = 0x10000, .mux_off = 0x10000 + offsetof(struct fsl_edma3_ch_reg, ch_mux), .mux_skip = 0x10000, .setup_irq = fsl_edma3_irq_init, }; static struct fsl_edma_drvdata imx93_data3 = { .flags = FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_EDMA3, .chreg_space_sz = 0x10000, .chreg_off = 0x10000, .setup_irq = fsl_edma3_irq_init, }; static struct fsl_edma_drvdata imx93_data4 = { .flags = FSL_EDMA_DRV_HAS_CHMUX | FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_EDMA4, .chreg_space_sz = 0x8000, .chreg_off = 0x10000, .mux_off = 0x10000 + offsetof(struct fsl_edma3_ch_reg, ch_mux), .mux_skip = 0x8000, .setup_irq = fsl_edma3_irq_init, }; static struct fsl_edma_drvdata imx95_data5 = { .flags = FSL_EDMA_DRV_HAS_CHMUX | FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_EDMA4 | FSL_EDMA_DRV_TCD64, .chreg_space_sz = 0x8000, .chreg_off = 0x10000, .mux_off = 0x200, .mux_skip = sizeof(u32), .setup_irq = fsl_edma3_irq_init, }; static const struct of_device_id fsl_edma_dt_ids[] = { { .compatible = "fsl,vf610-edma", .data = &vf610_data}, { .compatible = "fsl,ls1028a-edma", .data = &ls1028a_data}, { .compatible = "fsl,imx7ulp-edma", .data = &imx7ulp_data}, { .compatible = "fsl,imx8qm-edma", .data = &imx8qm_data}, { .compatible = "fsl,imx8ulp-edma", .data = &imx8ulp_data}, { .compatible = "fsl,imx93-edma3", .data = &imx93_data3}, { .compatible = "fsl,imx93-edma4", .data = &imx93_data4}, { .compatible = "fsl,imx95-edma5", .data = &imx95_data5}, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, fsl_edma_dt_ids); static int fsl_edma3_attach_pd(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma) { struct fsl_edma_chan *fsl_chan; struct device_link *link; struct device *pd_chan; struct device *dev; int i; dev = &pdev->dev; for (i = 0; i < fsl_edma->n_chans; i++) { if (fsl_edma->chan_masked & BIT(i)) continue; fsl_chan = &fsl_edma->chans[i]; pd_chan = dev_pm_domain_attach_by_id(dev, i); if (IS_ERR_OR_NULL(pd_chan)) { dev_err(dev, "Failed attach pd %d\n", i); return -EINVAL; } link = device_link_add(dev, pd_chan, DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE); if (!link) { dev_err(dev, "Failed to add device_link to %d\n", i); return -EINVAL; } fsl_chan->pd_dev = pd_chan; pm_runtime_use_autosuspend(fsl_chan->pd_dev); pm_runtime_set_autosuspend_delay(fsl_chan->pd_dev, 200); pm_runtime_set_active(fsl_chan->pd_dev); } return 0; } static int fsl_edma_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct fsl_edma_engine *fsl_edma; const struct fsl_edma_drvdata *drvdata = NULL; u32 chan_mask[2] = {0, 0}; char clk_name[36]; struct edma_regs *regs; int chans; int ret, i; drvdata = device_get_match_data(&pdev->dev); if (!drvdata) { dev_err(&pdev->dev, "unable to find driver data\n"); return -EINVAL; } ret = of_property_read_u32(np, "dma-channels", &chans); if (ret) { dev_err(&pdev->dev, "Can't get dma-channels.\n"); return ret; } fsl_edma = devm_kzalloc(&pdev->dev, struct_size(fsl_edma, chans, chans), GFP_KERNEL); if (!fsl_edma) return -ENOMEM; fsl_edma->drvdata = drvdata; fsl_edma->n_chans = chans; mutex_init(&fsl_edma->fsl_edma_mutex); fsl_edma->membase = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(fsl_edma->membase)) return PTR_ERR(fsl_edma->membase); if (!(drvdata->flags & FSL_EDMA_DRV_SPLIT_REG)) { fsl_edma_setup_regs(fsl_edma); regs = &fsl_edma->regs; } if (drvdata->flags & FSL_EDMA_DRV_HAS_DMACLK) { fsl_edma->dmaclk = devm_clk_get_enabled(&pdev->dev, "dma"); if (IS_ERR(fsl_edma->dmaclk)) { dev_err(&pdev->dev, "Missing DMA block clock.\n"); return PTR_ERR(fsl_edma->dmaclk); } } ret = of_property_read_variable_u32_array(np, "dma-channel-mask", chan_mask, 1, 2); if (ret > 0) { fsl_edma->chan_masked = chan_mask[1]; fsl_edma->chan_masked <<= 32; fsl_edma->chan_masked |= chan_mask[0]; } for (i = 0; i < fsl_edma->drvdata->dmamuxs; i++) { char clkname[32]; /* eDMAv3 mux register move to TCD area if ch_mux exist */ if (drvdata->flags & FSL_EDMA_DRV_SPLIT_REG) break; fsl_edma->muxbase[i] = devm_platform_ioremap_resource(pdev, 1 + i); if (IS_ERR(fsl_edma->muxbase[i])) { /* on error: disable all previously enabled clks */ fsl_disable_clocks(fsl_edma, i); return PTR_ERR(fsl_edma->muxbase[i]); } sprintf(clkname, "dmamux%d", i); fsl_edma->muxclk[i] = devm_clk_get_enabled(&pdev->dev, clkname); if (IS_ERR(fsl_edma->muxclk[i])) { dev_err(&pdev->dev, "Missing DMAMUX block clock.\n"); /* on error: disable all previously enabled clks */ return PTR_ERR(fsl_edma->muxclk[i]); } } fsl_edma->big_endian = of_property_read_bool(np, "big-endian"); if (drvdata->flags & FSL_EDMA_DRV_HAS_PD) { ret = fsl_edma3_attach_pd(pdev, fsl_edma); if (ret) return ret; } if (drvdata->flags & FSL_EDMA_DRV_TCD64) dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); INIT_LIST_HEAD(&fsl_edma->dma_dev.channels); for (i = 0; i < fsl_edma->n_chans; i++) { struct fsl_edma_chan *fsl_chan = &fsl_edma->chans[i]; int len; if (fsl_edma->chan_masked & BIT(i)) continue; snprintf(fsl_chan->chan_name, sizeof(fsl_chan->chan_name), "%s-CH%02d", dev_name(&pdev->dev), i); fsl_chan->edma = fsl_edma; fsl_chan->pm_state = RUNNING; fsl_chan->srcid = 0; fsl_chan->idle = true; fsl_chan->dma_dir = DMA_NONE; fsl_chan->vchan.desc_free = fsl_edma_free_desc; len = (drvdata->flags & FSL_EDMA_DRV_SPLIT_REG) ? offsetof(struct fsl_edma3_ch_reg, tcd) : 0; fsl_chan->tcd = fsl_edma->membase + i * drvdata->chreg_space_sz + drvdata->chreg_off + len; fsl_chan->mux_addr = fsl_edma->membase + drvdata->mux_off + i * drvdata->mux_skip; if (drvdata->flags & FSL_EDMA_DRV_HAS_CHCLK) { snprintf(clk_name, sizeof(clk_name), "ch%02d", i); fsl_chan->clk = devm_clk_get_enabled(&pdev->dev, (const char *)clk_name); if (IS_ERR(fsl_chan->clk)) return PTR_ERR(fsl_chan->clk); } fsl_chan->pdev = pdev; vchan_init(&fsl_chan->vchan, &fsl_edma->dma_dev); edma_write_tcdreg(fsl_chan, cpu_to_le32(0), csr); fsl_edma_chan_mux(fsl_chan, 0, false); if (fsl_chan->edma->drvdata->flags & FSL_EDMA_DRV_HAS_CHCLK) clk_disable_unprepare(fsl_chan->clk); } ret = fsl_edma->drvdata->setup_irq(pdev, fsl_edma); if (ret) return ret; dma_cap_set(DMA_PRIVATE, fsl_edma->dma_dev.cap_mask); dma_cap_set(DMA_SLAVE, fsl_edma->dma_dev.cap_mask); dma_cap_set(DMA_CYCLIC, fsl_edma->dma_dev.cap_mask); dma_cap_set(DMA_MEMCPY, fsl_edma->dma_dev.cap_mask); fsl_edma->dma_dev.dev = &pdev->dev; fsl_edma->dma_dev.device_alloc_chan_resources = fsl_edma_alloc_chan_resources; fsl_edma->dma_dev.device_free_chan_resources = fsl_edma_free_chan_resources; fsl_edma->dma_dev.device_tx_status = fsl_edma_tx_status; fsl_edma->dma_dev.device_prep_slave_sg = fsl_edma_prep_slave_sg; fsl_edma->dma_dev.device_prep_dma_cyclic = fsl_edma_prep_dma_cyclic; fsl_edma->dma_dev.device_prep_dma_memcpy = fsl_edma_prep_memcpy; fsl_edma->dma_dev.device_config = fsl_edma_slave_config; fsl_edma->dma_dev.device_pause = fsl_edma_pause; fsl_edma->dma_dev.device_resume = fsl_edma_resume; fsl_edma->dma_dev.device_terminate_all = fsl_edma_terminate_all; fsl_edma->dma_dev.device_synchronize = fsl_edma_synchronize; fsl_edma->dma_dev.device_issue_pending = fsl_edma_issue_pending; fsl_edma->dma_dev.src_addr_widths = FSL_EDMA_BUSWIDTHS; fsl_edma->dma_dev.dst_addr_widths = FSL_EDMA_BUSWIDTHS; if (drvdata->flags & FSL_EDMA_DRV_BUS_8BYTE) { fsl_edma->dma_dev.src_addr_widths |= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES); fsl_edma->dma_dev.dst_addr_widths |= BIT(DMA_SLAVE_BUSWIDTH_8_BYTES); } fsl_edma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); if (drvdata->flags & FSL_EDMA_DRV_DEV_TO_DEV) fsl_edma->dma_dev.directions |= BIT(DMA_DEV_TO_DEV); fsl_edma->dma_dev.copy_align = drvdata->flags & FSL_EDMA_DRV_ALIGN_64BYTE ? DMAENGINE_ALIGN_64_BYTES : DMAENGINE_ALIGN_32_BYTES; /* Per worst case 'nbytes = 1' take CITER as the max_seg_size */ dma_set_max_seg_size(fsl_edma->dma_dev.dev, FIELD_GET(EDMA_TCD_ITER_MASK, EDMA_TCD_ITER_MASK)); fsl_edma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT; platform_set_drvdata(pdev, fsl_edma); ret = dma_async_device_register(&fsl_edma->dma_dev); if (ret) { dev_err(&pdev->dev, "Can't register Freescale eDMA engine. (%d)\n", ret); return ret; } ret = of_dma_controller_register(np, drvdata->flags & FSL_EDMA_DRV_SPLIT_REG ? fsl_edma3_xlate : fsl_edma_xlate, fsl_edma); if (ret) { dev_err(&pdev->dev, "Can't register Freescale eDMA of_dma. (%d)\n", ret); dma_async_device_unregister(&fsl_edma->dma_dev); return ret; } /* enable round robin arbitration */ if (!(drvdata->flags & FSL_EDMA_DRV_SPLIT_REG)) edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr); return 0; } static void fsl_edma_remove(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct fsl_edma_engine *fsl_edma = platform_get_drvdata(pdev); fsl_edma_irq_exit(pdev, fsl_edma); fsl_edma_cleanup_vchan(&fsl_edma->dma_dev); of_dma_controller_free(np); dma_async_device_unregister(&fsl_edma->dma_dev); fsl_disable_clocks(fsl_edma, fsl_edma->drvdata->dmamuxs); } static int fsl_edma_suspend_late(struct device *dev) { struct fsl_edma_engine *fsl_edma = dev_get_drvdata(dev); struct fsl_edma_chan *fsl_chan; unsigned long flags; int i; for (i = 0; i < fsl_edma->n_chans; i++) { fsl_chan = &fsl_edma->chans[i]; if (fsl_edma->chan_masked & BIT(i)) continue; spin_lock_irqsave(&fsl_chan->vchan.lock, flags); /* Make sure chan is idle or will force disable. */ if (unlikely(!fsl_chan->idle)) { dev_warn(dev, "WARN: There is non-idle channel."); fsl_edma_disable_request(fsl_chan); fsl_edma_chan_mux(fsl_chan, 0, false); } fsl_chan->pm_state = SUSPENDED; spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); } return 0; } static int fsl_edma_resume_early(struct device *dev) { struct fsl_edma_engine *fsl_edma = dev_get_drvdata(dev); struct fsl_edma_chan *fsl_chan; struct edma_regs *regs = &fsl_edma->regs; int i; for (i = 0; i < fsl_edma->n_chans; i++) { fsl_chan = &fsl_edma->chans[i]; if (fsl_edma->chan_masked & BIT(i)) continue; fsl_chan->pm_state = RUNNING; edma_write_tcdreg(fsl_chan, 0, csr); if (fsl_chan->srcid != 0) fsl_edma_chan_mux(fsl_chan, fsl_chan->srcid, true); } if (!(fsl_edma->drvdata->flags & FSL_EDMA_DRV_SPLIT_REG)) edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr); return 0; } /* * eDMA provides the service to others, so it should be suspend late * and resume early. When eDMA suspend, all of the clients should stop * the DMA data transmission and let the channel idle. */ static const struct dev_pm_ops fsl_edma_pm_ops = { .suspend_late = fsl_edma_suspend_late, .resume_early = fsl_edma_resume_early, }; static struct platform_driver fsl_edma_driver = { .driver = { .name = "fsl-edma", .of_match_table = fsl_edma_dt_ids, .pm = &fsl_edma_pm_ops, }, .probe = fsl_edma_probe, .remove_new = fsl_edma_remove, }; static int __init fsl_edma_init(void) { return platform_driver_register(&fsl_edma_driver); } subsys_initcall(fsl_edma_init); static void __exit fsl_edma_exit(void) { platform_driver_unregister(&fsl_edma_driver); } module_exit(fsl_edma_exit); MODULE_ALIAS("platform:fsl-edma"); MODULE_DESCRIPTION("Freescale eDMA engine driver"); MODULE_LICENSE("GPL v2");