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- // SPDX-License-Identifier: GPL-2.0
- //
- // Copyright (C) 2019 Linaro Ltd.
- // Copyright (C) 2019 Socionext Inc.
- #include <linux/bits.h>
- #include <linux/dma-mapping.h>
- #include <linux/dmaengine.h>
- #include <linux/interrupt.h>
- #include <linux/iopoll.h>
- #include <linux/list.h>
- #include <linux/module.h>
- #include <linux/of_dma.h>
- #include <linux/platform_device.h>
- #include <linux/slab.h>
- #include <linux/types.h>
- #include <linux/bitfield.h>
- #include "virt-dma.h"
- /* global register */
- #define M10V_XDACS 0x00
- /* channel local register */
- #define M10V_XDTBC 0x10
- #define M10V_XDSSA 0x14
- #define M10V_XDDSA 0x18
- #define M10V_XDSAC 0x1C
- #define M10V_XDDAC 0x20
- #define M10V_XDDCC 0x24
- #define M10V_XDDES 0x28
- #define M10V_XDDPC 0x2C
- #define M10V_XDDSD 0x30
- #define M10V_XDACS_XE BIT(28)
- #define M10V_DEFBS 0x3
- #define M10V_DEFBL 0xf
- #define M10V_XDSAC_SBS GENMASK(17, 16)
- #define M10V_XDSAC_SBL GENMASK(11, 8)
- #define M10V_XDDAC_DBS GENMASK(17, 16)
- #define M10V_XDDAC_DBL GENMASK(11, 8)
- #define M10V_XDDES_CE BIT(28)
- #define M10V_XDDES_SE BIT(24)
- #define M10V_XDDES_SA BIT(15)
- #define M10V_XDDES_TF GENMASK(23, 20)
- #define M10V_XDDES_EI BIT(1)
- #define M10V_XDDES_TI BIT(0)
- #define M10V_XDDSD_IS_MASK GENMASK(3, 0)
- #define M10V_XDDSD_IS_NORMAL 0x8
- #define MLB_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 milbeaut_xdmac_desc {
- struct virt_dma_desc vd;
- size_t len;
- dma_addr_t src;
- dma_addr_t dst;
- };
- struct milbeaut_xdmac_chan {
- struct virt_dma_chan vc;
- struct milbeaut_xdmac_desc *md;
- void __iomem *reg_ch_base;
- };
- struct milbeaut_xdmac_device {
- struct dma_device ddev;
- void __iomem *reg_base;
- struct milbeaut_xdmac_chan channels[];
- };
- static struct milbeaut_xdmac_chan *
- to_milbeaut_xdmac_chan(struct virt_dma_chan *vc)
- {
- return container_of(vc, struct milbeaut_xdmac_chan, vc);
- }
- static struct milbeaut_xdmac_desc *
- to_milbeaut_xdmac_desc(struct virt_dma_desc *vd)
- {
- return container_of(vd, struct milbeaut_xdmac_desc, vd);
- }
- /* mc->vc.lock must be held by caller */
- static struct milbeaut_xdmac_desc *
- milbeaut_xdmac_next_desc(struct milbeaut_xdmac_chan *mc)
- {
- struct virt_dma_desc *vd;
- vd = vchan_next_desc(&mc->vc);
- if (!vd) {
- mc->md = NULL;
- return NULL;
- }
- list_del(&vd->node);
- mc->md = to_milbeaut_xdmac_desc(vd);
- return mc->md;
- }
- /* mc->vc.lock must be held by caller */
- static void milbeaut_chan_start(struct milbeaut_xdmac_chan *mc,
- struct milbeaut_xdmac_desc *md)
- {
- u32 val;
- /* Setup the channel */
- val = md->len - 1;
- writel_relaxed(val, mc->reg_ch_base + M10V_XDTBC);
- val = md->src;
- writel_relaxed(val, mc->reg_ch_base + M10V_XDSSA);
- val = md->dst;
- writel_relaxed(val, mc->reg_ch_base + M10V_XDDSA);
- val = readl_relaxed(mc->reg_ch_base + M10V_XDSAC);
- val &= ~(M10V_XDSAC_SBS | M10V_XDSAC_SBL);
- val |= FIELD_PREP(M10V_XDSAC_SBS, M10V_DEFBS) |
- FIELD_PREP(M10V_XDSAC_SBL, M10V_DEFBL);
- writel_relaxed(val, mc->reg_ch_base + M10V_XDSAC);
- val = readl_relaxed(mc->reg_ch_base + M10V_XDDAC);
- val &= ~(M10V_XDDAC_DBS | M10V_XDDAC_DBL);
- val |= FIELD_PREP(M10V_XDDAC_DBS, M10V_DEFBS) |
- FIELD_PREP(M10V_XDDAC_DBL, M10V_DEFBL);
- writel_relaxed(val, mc->reg_ch_base + M10V_XDDAC);
- /* Start the channel */
- val = readl_relaxed(mc->reg_ch_base + M10V_XDDES);
- val &= ~(M10V_XDDES_CE | M10V_XDDES_SE | M10V_XDDES_TF |
- M10V_XDDES_EI | M10V_XDDES_TI);
- val |= FIELD_PREP(M10V_XDDES_CE, 1) | FIELD_PREP(M10V_XDDES_SE, 1) |
- FIELD_PREP(M10V_XDDES_TF, 1) | FIELD_PREP(M10V_XDDES_EI, 1) |
- FIELD_PREP(M10V_XDDES_TI, 1);
- writel_relaxed(val, mc->reg_ch_base + M10V_XDDES);
- }
- /* mc->vc.lock must be held by caller */
- static void milbeaut_xdmac_start(struct milbeaut_xdmac_chan *mc)
- {
- struct milbeaut_xdmac_desc *md;
- md = milbeaut_xdmac_next_desc(mc);
- if (md)
- milbeaut_chan_start(mc, md);
- }
- static irqreturn_t milbeaut_xdmac_interrupt(int irq, void *dev_id)
- {
- struct milbeaut_xdmac_chan *mc = dev_id;
- struct milbeaut_xdmac_desc *md;
- u32 val;
- spin_lock(&mc->vc.lock);
- /* Ack and Stop */
- val = FIELD_PREP(M10V_XDDSD_IS_MASK, 0x0);
- writel_relaxed(val, mc->reg_ch_base + M10V_XDDSD);
- md = mc->md;
- if (!md)
- goto out;
- vchan_cookie_complete(&md->vd);
- milbeaut_xdmac_start(mc);
- out:
- spin_unlock(&mc->vc.lock);
- return IRQ_HANDLED;
- }
- static void milbeaut_xdmac_free_chan_resources(struct dma_chan *chan)
- {
- vchan_free_chan_resources(to_virt_chan(chan));
- }
- static struct dma_async_tx_descriptor *
- milbeaut_xdmac_prep_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 milbeaut_xdmac_desc *md;
- md = kzalloc(sizeof(*md), GFP_NOWAIT);
- if (!md)
- return NULL;
- md->len = len;
- md->src = src;
- md->dst = dst;
- return vchan_tx_prep(vc, &md->vd, flags);
- }
- static int milbeaut_xdmac_terminate_all(struct dma_chan *chan)
- {
- struct virt_dma_chan *vc = to_virt_chan(chan);
- struct milbeaut_xdmac_chan *mc = to_milbeaut_xdmac_chan(vc);
- unsigned long flags;
- u32 val;
- LIST_HEAD(head);
- spin_lock_irqsave(&vc->lock, flags);
- /* Halt the channel */
- val = readl(mc->reg_ch_base + M10V_XDDES);
- val &= ~M10V_XDDES_CE;
- val |= FIELD_PREP(M10V_XDDES_CE, 0);
- writel(val, mc->reg_ch_base + M10V_XDDES);
- if (mc->md) {
- vchan_terminate_vdesc(&mc->md->vd);
- mc->md = NULL;
- }
- vchan_get_all_descriptors(vc, &head);
- spin_unlock_irqrestore(&vc->lock, flags);
- vchan_dma_desc_free_list(vc, &head);
- return 0;
- }
- static void milbeaut_xdmac_synchronize(struct dma_chan *chan)
- {
- vchan_synchronize(to_virt_chan(chan));
- }
- static void milbeaut_xdmac_issue_pending(struct dma_chan *chan)
- {
- struct virt_dma_chan *vc = to_virt_chan(chan);
- struct milbeaut_xdmac_chan *mc = to_milbeaut_xdmac_chan(vc);
- unsigned long flags;
- spin_lock_irqsave(&vc->lock, flags);
- if (vchan_issue_pending(vc) && !mc->md)
- milbeaut_xdmac_start(mc);
- spin_unlock_irqrestore(&vc->lock, flags);
- }
- static void milbeaut_xdmac_desc_free(struct virt_dma_desc *vd)
- {
- kfree(to_milbeaut_xdmac_desc(vd));
- }
- static int milbeaut_xdmac_chan_init(struct platform_device *pdev,
- struct milbeaut_xdmac_device *mdev,
- int chan_id)
- {
- struct device *dev = &pdev->dev;
- struct milbeaut_xdmac_chan *mc = &mdev->channels[chan_id];
- char *irq_name;
- int irq, ret;
- irq = platform_get_irq(pdev, chan_id);
- if (irq < 0)
- return irq;
- irq_name = devm_kasprintf(dev, GFP_KERNEL, "milbeaut-xdmac-%d",
- chan_id);
- if (!irq_name)
- return -ENOMEM;
- ret = devm_request_irq(dev, irq, milbeaut_xdmac_interrupt,
- IRQF_SHARED, irq_name, mc);
- if (ret)
- return ret;
- mc->reg_ch_base = mdev->reg_base + chan_id * 0x30;
- mc->vc.desc_free = milbeaut_xdmac_desc_free;
- vchan_init(&mc->vc, &mdev->ddev);
- return 0;
- }
- static void enable_xdmac(struct milbeaut_xdmac_device *mdev)
- {
- unsigned int val;
- val = readl(mdev->reg_base + M10V_XDACS);
- val |= M10V_XDACS_XE;
- writel(val, mdev->reg_base + M10V_XDACS);
- }
- static void disable_xdmac(struct milbeaut_xdmac_device *mdev)
- {
- unsigned int val;
- val = readl(mdev->reg_base + M10V_XDACS);
- val &= ~M10V_XDACS_XE;
- writel(val, mdev->reg_base + M10V_XDACS);
- }
- static int milbeaut_xdmac_probe(struct platform_device *pdev)
- {
- struct device *dev = &pdev->dev;
- struct milbeaut_xdmac_device *mdev;
- struct dma_device *ddev;
- int nr_chans, ret, i;
- nr_chans = platform_irq_count(pdev);
- if (nr_chans < 0)
- return nr_chans;
- mdev = devm_kzalloc(dev, struct_size(mdev, channels, nr_chans),
- GFP_KERNEL);
- if (!mdev)
- return -ENOMEM;
- mdev->reg_base = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(mdev->reg_base))
- return PTR_ERR(mdev->reg_base);
- ddev = &mdev->ddev;
- ddev->dev = dev;
- dma_cap_set(DMA_MEMCPY, ddev->cap_mask);
- ddev->src_addr_widths = MLB_XDMAC_BUSWIDTHS;
- ddev->dst_addr_widths = MLB_XDMAC_BUSWIDTHS;
- ddev->device_free_chan_resources = milbeaut_xdmac_free_chan_resources;
- ddev->device_prep_dma_memcpy = milbeaut_xdmac_prep_memcpy;
- ddev->device_terminate_all = milbeaut_xdmac_terminate_all;
- ddev->device_synchronize = milbeaut_xdmac_synchronize;
- ddev->device_tx_status = dma_cookie_status;
- ddev->device_issue_pending = milbeaut_xdmac_issue_pending;
- INIT_LIST_HEAD(&ddev->channels);
- for (i = 0; i < nr_chans; i++) {
- ret = milbeaut_xdmac_chan_init(pdev, mdev, i);
- if (ret)
- return ret;
- }
- enable_xdmac(mdev);
- ret = dma_async_device_register(ddev);
- if (ret)
- goto disable_xdmac;
- ret = of_dma_controller_register(dev->of_node,
- of_dma_simple_xlate, mdev);
- if (ret)
- goto unregister_dmac;
- platform_set_drvdata(pdev, mdev);
- return 0;
- unregister_dmac:
- dma_async_device_unregister(ddev);
- disable_xdmac:
- disable_xdmac(mdev);
- return ret;
- }
- static int milbeaut_xdmac_remove(struct platform_device *pdev)
- {
- struct milbeaut_xdmac_device *mdev = platform_get_drvdata(pdev);
- 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, &mdev->ddev.channels, device_node) {
- ret = dmaengine_terminate_sync(chan);
- if (ret)
- return ret;
- milbeaut_xdmac_free_chan_resources(chan);
- }
- of_dma_controller_free(pdev->dev.of_node);
- dma_async_device_unregister(&mdev->ddev);
- disable_xdmac(mdev);
- return 0;
- }
- static const struct of_device_id milbeaut_xdmac_match[] = {
- { .compatible = "socionext,milbeaut-m10v-xdmac" },
- { /* sentinel */ }
- };
- MODULE_DEVICE_TABLE(of, milbeaut_xdmac_match);
- static struct platform_driver milbeaut_xdmac_driver = {
- .probe = milbeaut_xdmac_probe,
- .remove = milbeaut_xdmac_remove,
- .driver = {
- .name = "milbeaut-m10v-xdmac",
- .of_match_table = milbeaut_xdmac_match,
- },
- };
- module_platform_driver(milbeaut_xdmac_driver);
- MODULE_DESCRIPTION("Milbeaut XDMAC DmaEngine driver");
- MODULE_LICENSE("GPL v2");
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