| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Kunihiko Hayashi | 2788 | 99.89% | 3 | 75.00% |
| Herbert Xu | 3 | 0.11% | 1 | 25.00% |
| Total | 2791 | 4 |
// SPDX-License-Identifier: GPL-2.0 /* * External DMA controller driver for UniPhier SoCs * Copyright 2019 Socionext Inc. * Author: Kunihiko Hayashi <hayashi.kunihiko@socionext.com> */ #include <linux/bitops.h> #include <linux/bitfield.h> #include <linux/iopoll.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_dma.h> #include <linux/platform_device.h> #include <linux/slab.h> #include "dmaengine.h" #include "virt-dma.h" #define XDMAC_CH_WIDTH 0x100 #define XDMAC_TFA 0x08 #define XDMAC_TFA_MCNT_MASK GENMASK(23, 16) #define XDMAC_TFA_MASK GENMASK(5, 0) #define XDMAC_SADM 0x10 #define XDMAC_SADM_STW_MASK GENMASK(25, 24) #define XDMAC_SADM_SAM BIT(4) #define XDMAC_SADM_SAM_FIXED XDMAC_SADM_SAM #define XDMAC_SADM_SAM_INC 0 #define XDMAC_DADM 0x14 #define XDMAC_DADM_DTW_MASK XDMAC_SADM_STW_MASK #define XDMAC_DADM_DAM XDMAC_SADM_SAM #define XDMAC_DADM_DAM_FIXED XDMAC_SADM_SAM_FIXED #define XDMAC_DADM_DAM_INC XDMAC_SADM_SAM_INC #define XDMAC_EXSAD 0x18 #define XDMAC_EXDAD 0x1c #define XDMAC_SAD 0x20 #define XDMAC_DAD 0x24 #define XDMAC_ITS 0x28 #define XDMAC_ITS_MASK GENMASK(25, 0) #define XDMAC_TNUM 0x2c #define XDMAC_TNUM_MASK GENMASK(15, 0) #define XDMAC_TSS 0x30 #define XDMAC_TSS_REQ BIT(0) #define XDMAC_IEN 0x34 #define XDMAC_IEN_ERRIEN BIT(1) #define XDMAC_IEN_ENDIEN BIT(0) #define XDMAC_STAT 0x40 #define XDMAC_STAT_TENF BIT(0) #define XDMAC_IR 0x44 #define XDMAC_IR_ERRF BIT(1) #define XDMAC_IR_ENDF BIT(0) #define XDMAC_ID 0x48 #define XDMAC_ID_ERRIDF BIT(1) #define XDMAC_ID_ENDIDF BIT(0) #define XDMAC_MAX_CHANS 16 #define XDMAC_INTERVAL_CLKS 20 #define XDMAC_MAX_WORDS XDMAC_TNUM_MASK /* cut lower bit for maintain alignment of maximum transfer size */ #define XDMAC_MAX_WORD_SIZE (XDMAC_ITS_MASK & ~GENMASK(3, 0)) #define UNIPHIER_XDMAC_BUSWIDTHS \ (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \ BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)) struct uniphier_xdmac_desc_node { dma_addr_t src; dma_addr_t dst; u32 burst_size; u32 nr_burst; }; struct uniphier_xdmac_desc { struct virt_dma_desc vd; unsigned int nr_node; unsigned int cur_node; enum dma_transfer_direction dir; struct uniphier_xdmac_desc_node nodes[]; }; struct uniphier_xdmac_chan { struct virt_dma_chan vc; struct uniphier_xdmac_device *xdev; struct uniphier_xdmac_desc *xd; void __iomem *reg_ch_base; struct dma_slave_config sconfig; int id; unsigned int req_factor; }; struct uniphier_xdmac_device { struct dma_device ddev; void __iomem *reg_base; int nr_chans; struct uniphier_xdmac_chan channels[]; }; static struct uniphier_xdmac_chan * to_uniphier_xdmac_chan(struct virt_dma_chan *vc) { return container_of(vc, struct uniphier_xdmac_chan, vc); } static struct uniphier_xdmac_desc * to_uniphier_xdmac_desc(struct virt_dma_desc *vd) { return container_of(vd, struct uniphier_xdmac_desc, vd); } /* xc->vc.lock must be held by caller */ static struct uniphier_xdmac_desc * uniphier_xdmac_next_desc(struct uniphier_xdmac_chan *xc) { struct virt_dma_desc *vd; vd = vchan_next_desc(&xc->vc); if (!vd) return NULL; list_del(&vd->node); return to_uniphier_xdmac_desc(vd); } /* xc->vc.lock must be held by caller */ static void uniphier_xdmac_chan_start(struct uniphier_xdmac_chan *xc, struct uniphier_xdmac_desc *xd) { u32 src_mode, src_width; u32 dst_mode, dst_width; dma_addr_t src_addr, dst_addr; u32 val, its, tnum; enum dma_slave_buswidth buswidth; src_addr = xd->nodes[xd->cur_node].src; dst_addr = xd->nodes[xd->cur_node].dst; its = xd->nodes[xd->cur_node].burst_size; tnum = xd->nodes[xd->cur_node].nr_burst; /* * The width of MEM side must be 4 or 8 bytes, that does not * affect that of DEV side and transfer size. */ if (xd->dir == DMA_DEV_TO_MEM) { src_mode = XDMAC_SADM_SAM_FIXED; buswidth = xc->sconfig.src_addr_width; } else { src_mode = XDMAC_SADM_SAM_INC; buswidth = DMA_SLAVE_BUSWIDTH_8_BYTES; } src_width = FIELD_PREP(XDMAC_SADM_STW_MASK, __ffs(buswidth)); if (xd->dir == DMA_MEM_TO_DEV) { dst_mode = XDMAC_DADM_DAM_FIXED; buswidth = xc->sconfig.dst_addr_width; } else { dst_mode = XDMAC_DADM_DAM_INC; buswidth = DMA_SLAVE_BUSWIDTH_8_BYTES; } dst_width = FIELD_PREP(XDMAC_DADM_DTW_MASK, __ffs(buswidth)); /* setup transfer factor */ val = FIELD_PREP(XDMAC_TFA_MCNT_MASK, XDMAC_INTERVAL_CLKS); val |= FIELD_PREP(XDMAC_TFA_MASK, xc->req_factor); writel(val, xc->reg_ch_base + XDMAC_TFA); /* setup the channel */ writel(lower_32_bits(src_addr), xc->reg_ch_base + XDMAC_SAD); writel(upper_32_bits(src_addr), xc->reg_ch_base + XDMAC_EXSAD); writel(lower_32_bits(dst_addr), xc->reg_ch_base + XDMAC_DAD); writel(upper_32_bits(dst_addr), xc->reg_ch_base + XDMAC_EXDAD); src_mode |= src_width; dst_mode |= dst_width; writel(src_mode, xc->reg_ch_base + XDMAC_SADM); writel(dst_mode, xc->reg_ch_base + XDMAC_DADM); writel(its, xc->reg_ch_base + XDMAC_ITS); writel(tnum, xc->reg_ch_base + XDMAC_TNUM); /* enable interrupt */ writel(XDMAC_IEN_ENDIEN | XDMAC_IEN_ERRIEN, xc->reg_ch_base + XDMAC_IEN); /* start XDMAC */ val = readl(xc->reg_ch_base + XDMAC_TSS); val |= XDMAC_TSS_REQ; writel(val, xc->reg_ch_base + XDMAC_TSS); } /* xc->vc.lock must be held by caller */ static int uniphier_xdmac_chan_stop(struct uniphier_xdmac_chan *xc) { u32 val; /* disable interrupt */ val = readl(xc->reg_ch_base + XDMAC_IEN); val &= ~(XDMAC_IEN_ENDIEN | XDMAC_IEN_ERRIEN); writel(val, xc->reg_ch_base + XDMAC_IEN); /* stop XDMAC */ val = readl(xc->reg_ch_base + XDMAC_TSS); val &= ~XDMAC_TSS_REQ; writel(0, xc->reg_ch_base + XDMAC_TSS); /* wait until transfer is stopped */ return readl_poll_timeout_atomic(xc->reg_ch_base + XDMAC_STAT, val, !(val & XDMAC_STAT_TENF), 100, 1000); } /* xc->vc.lock must be held by caller */ static void uniphier_xdmac_start(struct uniphier_xdmac_chan *xc) { struct uniphier_xdmac_desc *xd; xd = uniphier_xdmac_next_desc(xc); if (xd) uniphier_xdmac_chan_start(xc, xd); /* set desc to chan regardless of xd is null */ xc->xd = xd; } static void uniphier_xdmac_chan_irq(struct uniphier_xdmac_chan *xc) { u32 stat; int ret; spin_lock(&xc->vc.lock); stat = readl(xc->reg_ch_base + XDMAC_ID); if (stat & XDMAC_ID_ERRIDF) { ret = uniphier_xdmac_chan_stop(xc); if (ret) dev_err(xc->xdev->ddev.dev, "DMA transfer error with aborting issue\n"); else dev_err(xc->xdev->ddev.dev, "DMA transfer error\n"); } else if ((stat & XDMAC_ID_ENDIDF) && xc->xd) { xc->xd->cur_node++; if (xc->xd->cur_node >= xc->xd->nr_node) { vchan_cookie_complete(&xc->xd->vd); uniphier_xdmac_start(xc); } else { uniphier_xdmac_chan_start(xc, xc->xd); } } /* write bits to clear */ writel(stat, xc->reg_ch_base + XDMAC_IR); spin_unlock(&xc->vc.lock); } static irqreturn_t uniphier_xdmac_irq_handler(int irq, void *dev_id) { struct uniphier_xdmac_device *xdev = dev_id; int i; for (i = 0; i < xdev->nr_chans; i++) uniphier_xdmac_chan_irq(&xdev->channels[i]); return IRQ_HANDLED; } static void uniphier_xdmac_free_chan_resources(struct dma_chan *chan) { vchan_free_chan_resources(to_virt_chan(chan)); } static struct dma_async_tx_descriptor * uniphier_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst, dma_addr_t src, size_t len, unsigned long flags) { struct virt_dma_chan *vc = to_virt_chan(chan); struct uniphier_xdmac_desc *xd; unsigned int nr; size_t burst_size, tlen; int i; if (len > XDMAC_MAX_WORD_SIZE * XDMAC_MAX_WORDS) return NULL; nr = 1 + len / XDMAC_MAX_WORD_SIZE; xd = kzalloc(struct_size(xd, nodes, nr), GFP_NOWAIT); if (!xd) return NULL; for (i = 0; i < nr; i++) { burst_size = min_t(size_t, len, XDMAC_MAX_WORD_SIZE); xd->nodes[i].src = src; xd->nodes[i].dst = dst; xd->nodes[i].burst_size = burst_size; xd->nodes[i].nr_burst = len / burst_size; tlen = rounddown(len, burst_size); src += tlen; dst += tlen; len -= tlen; } xd->dir = DMA_MEM_TO_MEM; xd->nr_node = nr; xd->cur_node = 0; return vchan_tx_prep(vc, &xd->vd, flags); } static struct dma_async_tx_descriptor * uniphier_xdmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len, enum dma_transfer_direction direction, unsigned long flags, void *context) { struct virt_dma_chan *vc = to_virt_chan(chan); struct uniphier_xdmac_chan *xc = to_uniphier_xdmac_chan(vc); struct uniphier_xdmac_desc *xd; struct scatterlist *sg; enum dma_slave_buswidth buswidth; u32 maxburst; int i; if (!is_slave_direction(direction)) return NULL; if (direction == DMA_DEV_TO_MEM) { buswidth = xc->sconfig.src_addr_width; maxburst = xc->sconfig.src_maxburst; } else { buswidth = xc->sconfig.dst_addr_width; maxburst = xc->sconfig.dst_maxburst; } if (!maxburst) maxburst = 1; if (maxburst > xc->xdev->ddev.max_burst) { dev_err(xc->xdev->ddev.dev, "Exceed maximum number of burst words\n"); return NULL; } xd = kzalloc(struct_size(xd, nodes, sg_len), GFP_NOWAIT); if (!xd) return NULL; for_each_sg(sgl, sg, sg_len, i) { xd->nodes[i].src = (direction == DMA_DEV_TO_MEM) ? xc->sconfig.src_addr : sg_dma_address(sg); xd->nodes[i].dst = (direction == DMA_MEM_TO_DEV) ? xc->sconfig.dst_addr : sg_dma_address(sg); xd->nodes[i].burst_size = maxburst * buswidth; xd->nodes[i].nr_burst = sg_dma_len(sg) / xd->nodes[i].burst_size; /* * Currently transfer that size doesn't align the unit size * (the number of burst words * bus-width) is not allowed, * because the driver does not support the way to transfer * residue size. As a matter of fact, in order to transfer * arbitrary size, 'src_maxburst' or 'dst_maxburst' of * dma_slave_config must be 1. */ if (sg_dma_len(sg) % xd->nodes[i].burst_size) { dev_err(xc->xdev->ddev.dev, "Unaligned transfer size: %d", sg_dma_len(sg)); kfree(xd); return NULL; } if (xd->nodes[i].nr_burst > XDMAC_MAX_WORDS) { dev_err(xc->xdev->ddev.dev, "Exceed maximum transfer size"); kfree(xd); return NULL; } } xd->dir = direction; xd->nr_node = sg_len; xd->cur_node = 0; return vchan_tx_prep(vc, &xd->vd, flags); } static int uniphier_xdmac_slave_config(struct dma_chan *chan, struct dma_slave_config *config) { struct virt_dma_chan *vc = to_virt_chan(chan); struct uniphier_xdmac_chan *xc = to_uniphier_xdmac_chan(vc); memcpy(&xc->sconfig, config, sizeof(*config)); return 0; } static int uniphier_xdmac_terminate_all(struct dma_chan *chan) { struct virt_dma_chan *vc = to_virt_chan(chan); struct uniphier_xdmac_chan *xc = to_uniphier_xdmac_chan(vc); unsigned long flags; int ret = 0; LIST_HEAD(head); spin_lock_irqsave(&vc->lock, flags); if (xc->xd) { vchan_terminate_vdesc(&xc->xd->vd); xc->xd = NULL; ret = uniphier_xdmac_chan_stop(xc); } vchan_get_all_descriptors(vc, &head); spin_unlock_irqrestore(&vc->lock, flags); vchan_dma_desc_free_list(vc, &head); return ret; } static void uniphier_xdmac_synchronize(struct dma_chan *chan) { vchan_synchronize(to_virt_chan(chan)); } static void uniphier_xdmac_issue_pending(struct dma_chan *chan) { struct virt_dma_chan *vc = to_virt_chan(chan); struct uniphier_xdmac_chan *xc = to_uniphier_xdmac_chan(vc); unsigned long flags; spin_lock_irqsave(&vc->lock, flags); if (vchan_issue_pending(vc) && !xc->xd) uniphier_xdmac_start(xc); spin_unlock_irqrestore(&vc->lock, flags); } static void uniphier_xdmac_desc_free(struct virt_dma_desc *vd) { kfree(to_uniphier_xdmac_desc(vd)); } static void uniphier_xdmac_chan_init(struct uniphier_xdmac_device *xdev, int ch) { struct uniphier_xdmac_chan *xc = &xdev->channels[ch]; xc->xdev = xdev; xc->reg_ch_base = xdev->reg_base + XDMAC_CH_WIDTH * ch; xc->vc.desc_free = uniphier_xdmac_desc_free; vchan_init(&xc->vc, &xdev->ddev); } static struct dma_chan *of_dma_uniphier_xlate(struct of_phandle_args *dma_spec, struct of_dma *ofdma) { struct uniphier_xdmac_device *xdev = ofdma->of_dma_data; int chan_id = dma_spec->args[0]; if (chan_id >= xdev->nr_chans) return NULL; xdev->channels[chan_id].id = chan_id; xdev->channels[chan_id].req_factor = dma_spec->args[1]; return dma_get_slave_channel(&xdev->channels[chan_id].vc.chan); } static int uniphier_xdmac_probe(struct platform_device *pdev) { struct uniphier_xdmac_device *xdev; struct device *dev = &pdev->dev; struct dma_device *ddev; int irq; int nr_chans; int i, ret; if (of_property_read_u32(dev->of_node, "dma-channels", &nr_chans)) return -EINVAL; if (nr_chans > XDMAC_MAX_CHANS) nr_chans = XDMAC_MAX_CHANS; xdev = devm_kzalloc(dev, struct_size(xdev, channels, nr_chans), GFP_KERNEL); if (!xdev) return -ENOMEM; xdev->nr_chans = nr_chans; xdev->reg_base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(xdev->reg_base)) return PTR_ERR(xdev->reg_base); ddev = &xdev->ddev; ddev->dev = dev; dma_cap_zero(ddev->cap_mask); dma_cap_set(DMA_MEMCPY, ddev->cap_mask); dma_cap_set(DMA_SLAVE, ddev->cap_mask); ddev->src_addr_widths = UNIPHIER_XDMAC_BUSWIDTHS; ddev->dst_addr_widths = UNIPHIER_XDMAC_BUSWIDTHS; ddev->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) | BIT(DMA_MEM_TO_MEM); ddev->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; ddev->max_burst = XDMAC_MAX_WORDS; ddev->device_free_chan_resources = uniphier_xdmac_free_chan_resources; ddev->device_prep_dma_memcpy = uniphier_xdmac_prep_dma_memcpy; ddev->device_prep_slave_sg = uniphier_xdmac_prep_slave_sg; ddev->device_config = uniphier_xdmac_slave_config; ddev->device_terminate_all = uniphier_xdmac_terminate_all; ddev->device_synchronize = uniphier_xdmac_synchronize; ddev->device_tx_status = dma_cookie_status; ddev->device_issue_pending = uniphier_xdmac_issue_pending; INIT_LIST_HEAD(&ddev->channels); for (i = 0; i < nr_chans; i++) uniphier_xdmac_chan_init(xdev, i); irq = platform_get_irq(pdev, 0); if (irq < 0) return irq; ret = devm_request_irq(dev, irq, uniphier_xdmac_irq_handler, IRQF_SHARED, "xdmac", xdev); if (ret) { dev_err(dev, "Failed to request IRQ\n"); return ret; } ret = dma_async_device_register(ddev); if (ret) { dev_err(dev, "Failed to register XDMA device\n"); return ret; } ret = of_dma_controller_register(dev->of_node, of_dma_uniphier_xlate, xdev); if (ret) { dev_err(dev, "Failed to register XDMA controller\n"); goto out_unregister_dmac; } platform_set_drvdata(pdev, xdev); dev_info(&pdev->dev, "UniPhier XDMAC driver (%d channels)\n", nr_chans); return 0; out_unregister_dmac: dma_async_device_unregister(ddev); return ret; } static int uniphier_xdmac_remove(struct platform_device *pdev) { struct uniphier_xdmac_device *xdev = platform_get_drvdata(pdev); struct dma_device *ddev = &xdev->ddev; struct dma_chan *chan; int ret; /* * Before reaching here, almost all descriptors have been freed by the * ->device_free_chan_resources() hook. However, each channel might * be still holding one descriptor that was on-flight at that moment. * Terminate it to make sure this hardware is no longer running. Then, * free the channel resources once again to avoid memory leak. */ list_for_each_entry(chan, &ddev->channels, device_node) { ret = dmaengine_terminate_sync(chan); if (ret) return ret; uniphier_xdmac_free_chan_resources(chan); } of_dma_controller_free(pdev->dev.of_node); dma_async_device_unregister(ddev); return 0; } static const struct of_device_id uniphier_xdmac_match[] = { { .compatible = "socionext,uniphier-xdmac" }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, uniphier_xdmac_match); static struct platform_driver uniphier_xdmac_driver = { .probe = uniphier_xdmac_probe, .remove = uniphier_xdmac_remove, .driver = { .name = "uniphier-xdmac", .of_match_table = uniphier_xdmac_match, }, }; module_platform_driver(uniphier_xdmac_driver); MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>"); MODULE_DESCRIPTION("UniPhier external DMA controller driver"); MODULE_LICENSE("GPL v2");
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