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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/clk.h>
- #include <linux/dma-mapping.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"
- #define MLB_HDMAC_DMACR 0x0 /* global */
- #define MLB_HDMAC_DE BIT(31)
- #define MLB_HDMAC_DS BIT(30)
- #define MLB_HDMAC_PR BIT(28)
- #define MLB_HDMAC_DH GENMASK(27, 24)
- #define MLB_HDMAC_CH_STRIDE 0x10
- #define MLB_HDMAC_DMACA 0x0 /* channel */
- #define MLB_HDMAC_EB BIT(31)
- #define MLB_HDMAC_PB BIT(30)
- #define MLB_HDMAC_ST BIT(29)
- #define MLB_HDMAC_IS GENMASK(28, 24)
- #define MLB_HDMAC_BT GENMASK(23, 20)
- #define MLB_HDMAC_BC GENMASK(19, 16)
- #define MLB_HDMAC_TC GENMASK(15, 0)
- #define MLB_HDMAC_DMACB 0x4
- #define MLB_HDMAC_TT GENMASK(31, 30)
- #define MLB_HDMAC_MS GENMASK(29, 28)
- #define MLB_HDMAC_TW GENMASK(27, 26)
- #define MLB_HDMAC_FS BIT(25)
- #define MLB_HDMAC_FD BIT(24)
- #define MLB_HDMAC_RC BIT(23)
- #define MLB_HDMAC_RS BIT(22)
- #define MLB_HDMAC_RD BIT(21)
- #define MLB_HDMAC_EI BIT(20)
- #define MLB_HDMAC_CI BIT(19)
- #define HDMAC_PAUSE 0x7
- #define MLB_HDMAC_SS GENMASK(18, 16)
- #define MLB_HDMAC_SP GENMASK(15, 12)
- #define MLB_HDMAC_DP GENMASK(11, 8)
- #define MLB_HDMAC_DMACSA 0x8
- #define MLB_HDMAC_DMACDA 0xc
- #define MLB_HDMAC_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
- BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
- BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
- struct milbeaut_hdmac_desc {
- struct virt_dma_desc vd;
- struct scatterlist *sgl;
- unsigned int sg_len;
- unsigned int sg_cur;
- enum dma_transfer_direction dir;
- };
- struct milbeaut_hdmac_chan {
- struct virt_dma_chan vc;
- struct milbeaut_hdmac_device *mdev;
- struct milbeaut_hdmac_desc *md;
- void __iomem *reg_ch_base;
- unsigned int slave_id;
- struct dma_slave_config cfg;
- };
- struct milbeaut_hdmac_device {
- struct dma_device ddev;
- struct clk *clk;
- void __iomem *reg_base;
- struct milbeaut_hdmac_chan channels[];
- };
- static struct milbeaut_hdmac_chan *
- to_milbeaut_hdmac_chan(struct virt_dma_chan *vc)
- {
- return container_of(vc, struct milbeaut_hdmac_chan, vc);
- }
- static struct milbeaut_hdmac_desc *
- to_milbeaut_hdmac_desc(struct virt_dma_desc *vd)
- {
- return container_of(vd, struct milbeaut_hdmac_desc, vd);
- }
- /* mc->vc.lock must be held by caller */
- static struct milbeaut_hdmac_desc *
- milbeaut_hdmac_next_desc(struct milbeaut_hdmac_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_hdmac_desc(vd);
- return mc->md;
- }
- /* mc->vc.lock must be held by caller */
- static void milbeaut_chan_start(struct milbeaut_hdmac_chan *mc,
- struct milbeaut_hdmac_desc *md)
- {
- struct scatterlist *sg;
- u32 cb, ca, src_addr, dest_addr, len;
- u32 width, burst;
- sg = &md->sgl[md->sg_cur];
- len = sg_dma_len(sg);
- cb = MLB_HDMAC_CI | MLB_HDMAC_EI;
- if (md->dir == DMA_MEM_TO_DEV) {
- cb |= MLB_HDMAC_FD;
- width = mc->cfg.dst_addr_width;
- burst = mc->cfg.dst_maxburst;
- src_addr = sg_dma_address(sg);
- dest_addr = mc->cfg.dst_addr;
- } else {
- cb |= MLB_HDMAC_FS;
- width = mc->cfg.src_addr_width;
- burst = mc->cfg.src_maxburst;
- src_addr = mc->cfg.src_addr;
- dest_addr = sg_dma_address(sg);
- }
- cb |= FIELD_PREP(MLB_HDMAC_TW, (width >> 1));
- cb |= FIELD_PREP(MLB_HDMAC_MS, 2);
- writel_relaxed(MLB_HDMAC_DE, mc->mdev->reg_base + MLB_HDMAC_DMACR);
- writel_relaxed(src_addr, mc->reg_ch_base + MLB_HDMAC_DMACSA);
- writel_relaxed(dest_addr, mc->reg_ch_base + MLB_HDMAC_DMACDA);
- writel_relaxed(cb, mc->reg_ch_base + MLB_HDMAC_DMACB);
- ca = FIELD_PREP(MLB_HDMAC_IS, mc->slave_id);
- if (burst == 16)
- ca |= FIELD_PREP(MLB_HDMAC_BT, 0xf);
- else if (burst == 8)
- ca |= FIELD_PREP(MLB_HDMAC_BT, 0xd);
- else if (burst == 4)
- ca |= FIELD_PREP(MLB_HDMAC_BT, 0xb);
- burst *= width;
- ca |= FIELD_PREP(MLB_HDMAC_TC, (len / burst - 1));
- writel_relaxed(ca, mc->reg_ch_base + MLB_HDMAC_DMACA);
- ca |= MLB_HDMAC_EB;
- writel_relaxed(ca, mc->reg_ch_base + MLB_HDMAC_DMACA);
- }
- /* mc->vc.lock must be held by caller */
- static void milbeaut_hdmac_start(struct milbeaut_hdmac_chan *mc)
- {
- struct milbeaut_hdmac_desc *md;
- md = milbeaut_hdmac_next_desc(mc);
- if (md)
- milbeaut_chan_start(mc, md);
- }
- static irqreturn_t milbeaut_hdmac_interrupt(int irq, void *dev_id)
- {
- struct milbeaut_hdmac_chan *mc = dev_id;
- struct milbeaut_hdmac_desc *md;
- u32 val;
- spin_lock(&mc->vc.lock);
- /* Ack and Disable irqs */
- val = readl_relaxed(mc->reg_ch_base + MLB_HDMAC_DMACB);
- val &= ~(FIELD_PREP(MLB_HDMAC_SS, HDMAC_PAUSE));
- writel_relaxed(val, mc->reg_ch_base + MLB_HDMAC_DMACB);
- val &= ~MLB_HDMAC_EI;
- val &= ~MLB_HDMAC_CI;
- writel_relaxed(val, mc->reg_ch_base + MLB_HDMAC_DMACB);
- md = mc->md;
- if (!md)
- goto out;
- md->sg_cur++;
- if (md->sg_cur >= md->sg_len) {
- vchan_cookie_complete(&md->vd);
- md = milbeaut_hdmac_next_desc(mc);
- if (!md)
- goto out;
- }
- milbeaut_chan_start(mc, md);
- out:
- spin_unlock(&mc->vc.lock);
- return IRQ_HANDLED;
- }
- static void milbeaut_hdmac_free_chan_resources(struct dma_chan *chan)
- {
- vchan_free_chan_resources(to_virt_chan(chan));
- }
- static int
- milbeaut_hdmac_chan_config(struct dma_chan *chan, struct dma_slave_config *cfg)
- {
- struct virt_dma_chan *vc = to_virt_chan(chan);
- struct milbeaut_hdmac_chan *mc = to_milbeaut_hdmac_chan(vc);
- spin_lock(&mc->vc.lock);
- mc->cfg = *cfg;
- spin_unlock(&mc->vc.lock);
- return 0;
- }
- static int milbeaut_hdmac_chan_pause(struct dma_chan *chan)
- {
- struct virt_dma_chan *vc = to_virt_chan(chan);
- struct milbeaut_hdmac_chan *mc = to_milbeaut_hdmac_chan(vc);
- u32 val;
- spin_lock(&mc->vc.lock);
- val = readl_relaxed(mc->reg_ch_base + MLB_HDMAC_DMACA);
- val |= MLB_HDMAC_PB;
- writel_relaxed(val, mc->reg_ch_base + MLB_HDMAC_DMACA);
- spin_unlock(&mc->vc.lock);
- return 0;
- }
- static int milbeaut_hdmac_chan_resume(struct dma_chan *chan)
- {
- struct virt_dma_chan *vc = to_virt_chan(chan);
- struct milbeaut_hdmac_chan *mc = to_milbeaut_hdmac_chan(vc);
- u32 val;
- spin_lock(&mc->vc.lock);
- val = readl_relaxed(mc->reg_ch_base + MLB_HDMAC_DMACA);
- val &= ~MLB_HDMAC_PB;
- writel_relaxed(val, mc->reg_ch_base + MLB_HDMAC_DMACA);
- spin_unlock(&mc->vc.lock);
- return 0;
- }
- static struct dma_async_tx_descriptor *
- milbeaut_hdmac_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 milbeaut_hdmac_desc *md;
- int i;
- if (!is_slave_direction(direction))
- return NULL;
- md = kzalloc(sizeof(*md), GFP_NOWAIT);
- if (!md)
- return NULL;
- md->sgl = kcalloc(sg_len, sizeof(*sgl), GFP_NOWAIT);
- if (!md->sgl) {
- kfree(md);
- return NULL;
- }
- for (i = 0; i < sg_len; i++)
- md->sgl[i] = sgl[i];
- md->sg_len = sg_len;
- md->dir = direction;
- return vchan_tx_prep(vc, &md->vd, flags);
- }
- static int milbeaut_hdmac_terminate_all(struct dma_chan *chan)
- {
- struct virt_dma_chan *vc = to_virt_chan(chan);
- struct milbeaut_hdmac_chan *mc = to_milbeaut_hdmac_chan(vc);
- unsigned long flags;
- u32 val;
- LIST_HEAD(head);
- spin_lock_irqsave(&vc->lock, flags);
- val = readl_relaxed(mc->reg_ch_base + MLB_HDMAC_DMACA);
- val &= ~MLB_HDMAC_EB; /* disable the channel */
- writel_relaxed(val, mc->reg_ch_base + MLB_HDMAC_DMACA);
- 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_hdmac_synchronize(struct dma_chan *chan)
- {
- vchan_synchronize(to_virt_chan(chan));
- }
- static enum dma_status milbeaut_hdmac_tx_status(struct dma_chan *chan,
- dma_cookie_t cookie,
- struct dma_tx_state *txstate)
- {
- struct virt_dma_chan *vc;
- struct virt_dma_desc *vd;
- struct milbeaut_hdmac_chan *mc;
- struct milbeaut_hdmac_desc *md = NULL;
- enum dma_status stat;
- unsigned long flags;
- int i;
- stat = dma_cookie_status(chan, cookie, txstate);
- /* Return immediately if we do not need to compute the residue. */
- if (stat == DMA_COMPLETE || !txstate)
- return stat;
- vc = to_virt_chan(chan);
- spin_lock_irqsave(&vc->lock, flags);
- mc = to_milbeaut_hdmac_chan(vc);
- /* residue from the on-flight chunk */
- if (mc->md && mc->md->vd.tx.cookie == cookie) {
- struct scatterlist *sg;
- u32 done;
- md = mc->md;
- sg = &md->sgl[md->sg_cur];
- if (md->dir == DMA_DEV_TO_MEM)
- done = readl_relaxed(mc->reg_ch_base
- + MLB_HDMAC_DMACDA);
- else
- done = readl_relaxed(mc->reg_ch_base
- + MLB_HDMAC_DMACSA);
- done -= sg_dma_address(sg);
- txstate->residue = -done;
- }
- if (!md) {
- vd = vchan_find_desc(vc, cookie);
- if (vd)
- md = to_milbeaut_hdmac_desc(vd);
- }
- if (md) {
- /* residue from the queued chunks */
- for (i = md->sg_cur; i < md->sg_len; i++)
- txstate->residue += sg_dma_len(&md->sgl[i]);
- }
- spin_unlock_irqrestore(&vc->lock, flags);
- return stat;
- }
- static void milbeaut_hdmac_issue_pending(struct dma_chan *chan)
- {
- struct virt_dma_chan *vc = to_virt_chan(chan);
- struct milbeaut_hdmac_chan *mc = to_milbeaut_hdmac_chan(vc);
- unsigned long flags;
- spin_lock_irqsave(&vc->lock, flags);
- if (vchan_issue_pending(vc) && !mc->md)
- milbeaut_hdmac_start(mc);
- spin_unlock_irqrestore(&vc->lock, flags);
- }
- static void milbeaut_hdmac_desc_free(struct virt_dma_desc *vd)
- {
- struct milbeaut_hdmac_desc *md = to_milbeaut_hdmac_desc(vd);
- kfree(md->sgl);
- kfree(md);
- }
- static struct dma_chan *
- milbeaut_hdmac_xlate(struct of_phandle_args *dma_spec, struct of_dma *of_dma)
- {
- struct milbeaut_hdmac_device *mdev = of_dma->of_dma_data;
- struct milbeaut_hdmac_chan *mc;
- struct virt_dma_chan *vc;
- struct dma_chan *chan;
- if (dma_spec->args_count != 1)
- return NULL;
- chan = dma_get_any_slave_channel(&mdev->ddev);
- if (!chan)
- return NULL;
- vc = to_virt_chan(chan);
- mc = to_milbeaut_hdmac_chan(vc);
- mc->slave_id = dma_spec->args[0];
- return chan;
- }
- static int milbeaut_hdmac_chan_init(struct platform_device *pdev,
- struct milbeaut_hdmac_device *mdev,
- int chan_id)
- {
- struct device *dev = &pdev->dev;
- struct milbeaut_hdmac_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-hdmac-%d",
- chan_id);
- if (!irq_name)
- return -ENOMEM;
- ret = devm_request_irq(dev, irq, milbeaut_hdmac_interrupt,
- IRQF_SHARED, irq_name, mc);
- if (ret)
- return ret;
- mc->mdev = mdev;
- mc->reg_ch_base = mdev->reg_base + MLB_HDMAC_CH_STRIDE * (chan_id + 1);
- mc->vc.desc_free = milbeaut_hdmac_desc_free;
- vchan_init(&mc->vc, &mdev->ddev);
- return 0;
- }
- static int milbeaut_hdmac_probe(struct platform_device *pdev)
- {
- struct device *dev = &pdev->dev;
- struct milbeaut_hdmac_device *mdev;
- struct dma_device *ddev;
- int nr_chans, ret, i;
- nr_chans = platform_irq_count(pdev);
- if (nr_chans < 0)
- return nr_chans;
- ret = dma_set_mask(dev, DMA_BIT_MASK(32));
- if (ret)
- return ret;
- 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);
- mdev->clk = devm_clk_get(dev, NULL);
- if (IS_ERR(mdev->clk)) {
- dev_err(dev, "failed to get clock\n");
- return PTR_ERR(mdev->clk);
- }
- ret = clk_prepare_enable(mdev->clk);
- if (ret)
- return ret;
- ddev = &mdev->ddev;
- ddev->dev = dev;
- dma_cap_set(DMA_SLAVE, ddev->cap_mask);
- dma_cap_set(DMA_PRIVATE, ddev->cap_mask);
- ddev->src_addr_widths = MLB_HDMAC_BUSWIDTHS;
- ddev->dst_addr_widths = MLB_HDMAC_BUSWIDTHS;
- ddev->directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
- ddev->device_free_chan_resources = milbeaut_hdmac_free_chan_resources;
- ddev->device_config = milbeaut_hdmac_chan_config;
- ddev->device_pause = milbeaut_hdmac_chan_pause;
- ddev->device_resume = milbeaut_hdmac_chan_resume;
- ddev->device_prep_slave_sg = milbeaut_hdmac_prep_slave_sg;
- ddev->device_terminate_all = milbeaut_hdmac_terminate_all;
- ddev->device_synchronize = milbeaut_hdmac_synchronize;
- ddev->device_tx_status = milbeaut_hdmac_tx_status;
- ddev->device_issue_pending = milbeaut_hdmac_issue_pending;
- INIT_LIST_HEAD(&ddev->channels);
- for (i = 0; i < nr_chans; i++) {
- ret = milbeaut_hdmac_chan_init(pdev, mdev, i);
- if (ret)
- goto disable_clk;
- }
- ret = dma_async_device_register(ddev);
- if (ret)
- goto disable_clk;
- ret = of_dma_controller_register(dev->of_node,
- milbeaut_hdmac_xlate, mdev);
- if (ret)
- goto unregister_dmac;
- platform_set_drvdata(pdev, mdev);
- return 0;
- unregister_dmac:
- dma_async_device_unregister(ddev);
- disable_clk:
- clk_disable_unprepare(mdev->clk);
- return ret;
- }
- static int milbeaut_hdmac_remove(struct platform_device *pdev)
- {
- struct milbeaut_hdmac_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_hdmac_free_chan_resources(chan);
- }
- of_dma_controller_free(pdev->dev.of_node);
- dma_async_device_unregister(&mdev->ddev);
- clk_disable_unprepare(mdev->clk);
- return 0;
- }
- static const struct of_device_id milbeaut_hdmac_match[] = {
- { .compatible = "socionext,milbeaut-m10v-hdmac" },
- { /* sentinel */ }
- };
- MODULE_DEVICE_TABLE(of, milbeaut_hdmac_match);
- static struct platform_driver milbeaut_hdmac_driver = {
- .probe = milbeaut_hdmac_probe,
- .remove = milbeaut_hdmac_remove,
- .driver = {
- .name = "milbeaut-m10v-hdmac",
- .of_match_table = milbeaut_hdmac_match,
- },
- };
- module_platform_driver(milbeaut_hdmac_driver);
- MODULE_DESCRIPTION("Milbeaut HDMAC DmaEngine driver");
- MODULE_LICENSE("GPL v2");
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