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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2013 - 2015 Linaro Ltd.4 * Copyright (c) 2013 HiSilicon Limited.5 */6#include <linux/sched.h>7#include <linux/device.h>8#include <linux/dma-mapping.h>9#include <linux/dmapool.h>10#include <linux/dmaengine.h>11#include <linux/init.h>12#include <linux/interrupt.h>13#include <linux/kernel.h>14#include <linux/module.h>15#include <linux/platform_device.h>16#include <linux/slab.h>17#include <linux/spinlock.h>18#include <linux/of.h>19#include <linux/clk.h>20#include <linux/of_dma.h>21 22#include "virt-dma.h"23 24#define DRIVER_NAME		"k3-dma"25#define DMA_MAX_SIZE		0x1ffc26#define DMA_CYCLIC_MAX_PERIOD	0x100027#define LLI_BLOCK_SIZE		(4 * PAGE_SIZE)28 29#define INT_STAT		0x0030#define INT_TC1			0x0431#define INT_TC2			0x0832#define INT_ERR1		0x0c33#define INT_ERR2		0x1034#define INT_TC1_MASK		0x1835#define INT_TC2_MASK		0x1c36#define INT_ERR1_MASK		0x2037#define INT_ERR2_MASK		0x2438#define INT_TC1_RAW		0x60039#define INT_TC2_RAW		0x60840#define INT_ERR1_RAW		0x61041#define INT_ERR2_RAW		0x61842#define CH_PRI			0x68843#define CH_STAT			0x69044#define CX_CUR_CNT		0x70445#define CX_LLI			0x80046#define CX_CNT1			0x80c47#define CX_CNT0			0x81048#define CX_SRC			0x81449#define CX_DST			0x81850#define CX_CFG			0x81c51 52#define CX_LLI_CHAIN_EN		0x253#define CX_CFG_EN		0x154#define CX_CFG_NODEIRQ		BIT(1)55#define CX_CFG_MEM2PER		(0x1 << 2)56#define CX_CFG_PER2MEM		(0x2 << 2)57#define CX_CFG_SRCINCR		(0x1 << 31)58#define CX_CFG_DSTINCR		(0x1 << 30)59 60struct k3_desc_hw {61	u32 lli;62	u32 reserved[3];63	u32 count;64	u32 saddr;65	u32 daddr;66	u32 config;67} __aligned(32);68 69struct k3_dma_desc_sw {70	struct virt_dma_desc	vd;71	dma_addr_t		desc_hw_lli;72	size_t			desc_num;73	size_t			size;74	struct k3_desc_hw	*desc_hw;75};76 77struct k3_dma_phy;78 79struct k3_dma_chan {80	u32			ccfg;81	struct virt_dma_chan	vc;82	struct k3_dma_phy	*phy;83	struct list_head	node;84	dma_addr_t		dev_addr;85	enum dma_status		status;86	bool			cyclic;87	struct dma_slave_config	slave_config;88};89 90struct k3_dma_phy {91	u32			idx;92	void __iomem		*base;93	struct k3_dma_chan	*vchan;94	struct k3_dma_desc_sw	*ds_run;95	struct k3_dma_desc_sw	*ds_done;96};97 98struct k3_dma_dev {99	struct dma_device	slave;100	void __iomem		*base;101	struct tasklet_struct	task;102	spinlock_t		lock;103	struct list_head	chan_pending;104	struct k3_dma_phy	*phy;105	struct k3_dma_chan	*chans;106	struct clk		*clk;107	struct dma_pool		*pool;108	u32			dma_channels;109	u32			dma_requests;110	u32			dma_channel_mask;111	unsigned int		irq;112};113 114 115#define K3_FLAG_NOCLK	BIT(1)116 117struct k3dma_soc_data {118	unsigned long flags;119};120 121 122#define to_k3_dma(dmadev) container_of(dmadev, struct k3_dma_dev, slave)123 124static int k3_dma_config_write(struct dma_chan *chan,125			       enum dma_transfer_direction dir,126			       struct dma_slave_config *cfg);127 128static struct k3_dma_chan *to_k3_chan(struct dma_chan *chan)129{130	return container_of(chan, struct k3_dma_chan, vc.chan);131}132 133static void k3_dma_pause_dma(struct k3_dma_phy *phy, bool on)134{135	u32 val = 0;136 137	if (on) {138		val = readl_relaxed(phy->base + CX_CFG);139		val |= CX_CFG_EN;140		writel_relaxed(val, phy->base + CX_CFG);141	} else {142		val = readl_relaxed(phy->base + CX_CFG);143		val &= ~CX_CFG_EN;144		writel_relaxed(val, phy->base + CX_CFG);145	}146}147 148static void k3_dma_terminate_chan(struct k3_dma_phy *phy, struct k3_dma_dev *d)149{150	u32 val = 0;151 152	k3_dma_pause_dma(phy, false);153 154	val = 0x1 << phy->idx;155	writel_relaxed(val, d->base + INT_TC1_RAW);156	writel_relaxed(val, d->base + INT_TC2_RAW);157	writel_relaxed(val, d->base + INT_ERR1_RAW);158	writel_relaxed(val, d->base + INT_ERR2_RAW);159}160 161static void k3_dma_set_desc(struct k3_dma_phy *phy, struct k3_desc_hw *hw)162{163	writel_relaxed(hw->lli, phy->base + CX_LLI);164	writel_relaxed(hw->count, phy->base + CX_CNT0);165	writel_relaxed(hw->saddr, phy->base + CX_SRC);166	writel_relaxed(hw->daddr, phy->base + CX_DST);167	writel_relaxed(hw->config, phy->base + CX_CFG);168}169 170static u32 k3_dma_get_curr_cnt(struct k3_dma_dev *d, struct k3_dma_phy *phy)171{172	u32 cnt = 0;173 174	cnt = readl_relaxed(d->base + CX_CUR_CNT + phy->idx * 0x10);175	cnt &= 0xffff;176	return cnt;177}178 179static u32 k3_dma_get_curr_lli(struct k3_dma_phy *phy)180{181	return readl_relaxed(phy->base + CX_LLI);182}183 184static u32 k3_dma_get_chan_stat(struct k3_dma_dev *d)185{186	return readl_relaxed(d->base + CH_STAT);187}188 189static void k3_dma_enable_dma(struct k3_dma_dev *d, bool on)190{191	if (on) {192		/* set same priority */193		writel_relaxed(0x0, d->base + CH_PRI);194 195		/* unmask irq */196		writel_relaxed(0xffff, d->base + INT_TC1_MASK);197		writel_relaxed(0xffff, d->base + INT_TC2_MASK);198		writel_relaxed(0xffff, d->base + INT_ERR1_MASK);199		writel_relaxed(0xffff, d->base + INT_ERR2_MASK);200	} else {201		/* mask irq */202		writel_relaxed(0x0, d->base + INT_TC1_MASK);203		writel_relaxed(0x0, d->base + INT_TC2_MASK);204		writel_relaxed(0x0, d->base + INT_ERR1_MASK);205		writel_relaxed(0x0, d->base + INT_ERR2_MASK);206	}207}208 209static irqreturn_t k3_dma_int_handler(int irq, void *dev_id)210{211	struct k3_dma_dev *d = (struct k3_dma_dev *)dev_id;212	struct k3_dma_phy *p;213	struct k3_dma_chan *c;214	u32 stat = readl_relaxed(d->base + INT_STAT);215	u32 tc1  = readl_relaxed(d->base + INT_TC1);216	u32 tc2  = readl_relaxed(d->base + INT_TC2);217	u32 err1 = readl_relaxed(d->base + INT_ERR1);218	u32 err2 = readl_relaxed(d->base + INT_ERR2);219	u32 i, irq_chan = 0;220 221	while (stat) {222		i = __ffs(stat);223		stat &= ~BIT(i);224		if (likely(tc1 & BIT(i)) || (tc2 & BIT(i))) {225 226			p = &d->phy[i];227			c = p->vchan;228			if (c && (tc1 & BIT(i))) {229				spin_lock(&c->vc.lock);230				if (p->ds_run != NULL) {231					vchan_cookie_complete(&p->ds_run->vd);232					p->ds_done = p->ds_run;233					p->ds_run = NULL;234				}235				spin_unlock(&c->vc.lock);236			}237			if (c && (tc2 & BIT(i))) {238				spin_lock(&c->vc.lock);239				if (p->ds_run != NULL)240					vchan_cyclic_callback(&p->ds_run->vd);241				spin_unlock(&c->vc.lock);242			}243			irq_chan |= BIT(i);244		}245		if (unlikely((err1 & BIT(i)) || (err2 & BIT(i))))246			dev_warn(d->slave.dev, "DMA ERR\n");247	}248 249	writel_relaxed(irq_chan, d->base + INT_TC1_RAW);250	writel_relaxed(irq_chan, d->base + INT_TC2_RAW);251	writel_relaxed(err1, d->base + INT_ERR1_RAW);252	writel_relaxed(err2, d->base + INT_ERR2_RAW);253 254	if (irq_chan)255		tasklet_schedule(&d->task);256 257	if (irq_chan || err1 || err2)258		return IRQ_HANDLED;259 260	return IRQ_NONE;261}262 263static int k3_dma_start_txd(struct k3_dma_chan *c)264{265	struct k3_dma_dev *d = to_k3_dma(c->vc.chan.device);266	struct virt_dma_desc *vd = vchan_next_desc(&c->vc);267 268	if (!c->phy)269		return -EAGAIN;270 271	if (BIT(c->phy->idx) & k3_dma_get_chan_stat(d))272		return -EAGAIN;273 274	/* Avoid losing track of  ds_run if a transaction is in flight */275	if (c->phy->ds_run)276		return -EAGAIN;277 278	if (vd) {279		struct k3_dma_desc_sw *ds =280			container_of(vd, struct k3_dma_desc_sw, vd);281		/*282		 * fetch and remove request from vc->desc_issued283		 * so vc->desc_issued only contains desc pending284		 */285		list_del(&ds->vd.node);286 287		c->phy->ds_run = ds;288		c->phy->ds_done = NULL;289		/* start dma */290		k3_dma_set_desc(c->phy, &ds->desc_hw[0]);291		return 0;292	}293	c->phy->ds_run = NULL;294	c->phy->ds_done = NULL;295	return -EAGAIN;296}297 298static void k3_dma_tasklet(struct tasklet_struct *t)299{300	struct k3_dma_dev *d = from_tasklet(d, t, task);301	struct k3_dma_phy *p;302	struct k3_dma_chan *c, *cn;303	unsigned pch, pch_alloc = 0;304 305	/* check new dma request of running channel in vc->desc_issued */306	list_for_each_entry_safe(c, cn, &d->slave.channels, vc.chan.device_node) {307		spin_lock_irq(&c->vc.lock);308		p = c->phy;309		if (p && p->ds_done) {310			if (k3_dma_start_txd(c)) {311				/* No current txd associated with this channel */312				dev_dbg(d->slave.dev, "pchan %u: free\n", p->idx);313				/* Mark this channel free */314				c->phy = NULL;315				p->vchan = NULL;316			}317		}318		spin_unlock_irq(&c->vc.lock);319	}320 321	/* check new channel request in d->chan_pending */322	spin_lock_irq(&d->lock);323	for (pch = 0; pch < d->dma_channels; pch++) {324		if (!(d->dma_channel_mask & (1 << pch)))325			continue;326 327		p = &d->phy[pch];328 329		if (p->vchan == NULL && !list_empty(&d->chan_pending)) {330			c = list_first_entry(&d->chan_pending,331				struct k3_dma_chan, node);332			/* remove from d->chan_pending */333			list_del_init(&c->node);334			pch_alloc |= 1 << pch;335			/* Mark this channel allocated */336			p->vchan = c;337			c->phy = p;338			dev_dbg(d->slave.dev, "pchan %u: alloc vchan %p\n", pch, &c->vc);339		}340	}341	spin_unlock_irq(&d->lock);342 343	for (pch = 0; pch < d->dma_channels; pch++) {344		if (!(d->dma_channel_mask & (1 << pch)))345			continue;346 347		if (pch_alloc & (1 << pch)) {348			p = &d->phy[pch];349			c = p->vchan;350			if (c) {351				spin_lock_irq(&c->vc.lock);352				k3_dma_start_txd(c);353				spin_unlock_irq(&c->vc.lock);354			}355		}356	}357}358 359static void k3_dma_free_chan_resources(struct dma_chan *chan)360{361	struct k3_dma_chan *c = to_k3_chan(chan);362	struct k3_dma_dev *d = to_k3_dma(chan->device);363	unsigned long flags;364 365	spin_lock_irqsave(&d->lock, flags);366	list_del_init(&c->node);367	spin_unlock_irqrestore(&d->lock, flags);368 369	vchan_free_chan_resources(&c->vc);370	c->ccfg = 0;371}372 373static enum dma_status k3_dma_tx_status(struct dma_chan *chan,374	dma_cookie_t cookie, struct dma_tx_state *state)375{376	struct k3_dma_chan *c = to_k3_chan(chan);377	struct k3_dma_dev *d = to_k3_dma(chan->device);378	struct k3_dma_phy *p;379	struct virt_dma_desc *vd;380	unsigned long flags;381	enum dma_status ret;382	size_t bytes = 0;383 384	ret = dma_cookie_status(&c->vc.chan, cookie, state);385	if (ret == DMA_COMPLETE)386		return ret;387 388	spin_lock_irqsave(&c->vc.lock, flags);389	p = c->phy;390	ret = c->status;391 392	/*393	 * If the cookie is on our issue queue, then the residue is394	 * its total size.395	 */396	vd = vchan_find_desc(&c->vc, cookie);397	if (vd && !c->cyclic) {398		bytes = container_of(vd, struct k3_dma_desc_sw, vd)->size;399	} else if ((!p) || (!p->ds_run)) {400		bytes = 0;401	} else {402		struct k3_dma_desc_sw *ds = p->ds_run;403		u32 clli = 0, index = 0;404 405		bytes = k3_dma_get_curr_cnt(d, p);406		clli = k3_dma_get_curr_lli(p);407		index = ((clli - ds->desc_hw_lli) /408				sizeof(struct k3_desc_hw)) + 1;409		for (; index < ds->desc_num; index++) {410			bytes += ds->desc_hw[index].count;411			/* end of lli */412			if (!ds->desc_hw[index].lli)413				break;414		}415	}416	spin_unlock_irqrestore(&c->vc.lock, flags);417	dma_set_residue(state, bytes);418	return ret;419}420 421static void k3_dma_issue_pending(struct dma_chan *chan)422{423	struct k3_dma_chan *c = to_k3_chan(chan);424	struct k3_dma_dev *d = to_k3_dma(chan->device);425	unsigned long flags;426 427	spin_lock_irqsave(&c->vc.lock, flags);428	/* add request to vc->desc_issued */429	if (vchan_issue_pending(&c->vc)) {430		spin_lock(&d->lock);431		if (!c->phy) {432			if (list_empty(&c->node)) {433				/* if new channel, add chan_pending */434				list_add_tail(&c->node, &d->chan_pending);435				/* check in tasklet */436				tasklet_schedule(&d->task);437				dev_dbg(d->slave.dev, "vchan %p: issued\n", &c->vc);438			}439		}440		spin_unlock(&d->lock);441	} else442		dev_dbg(d->slave.dev, "vchan %p: nothing to issue\n", &c->vc);443	spin_unlock_irqrestore(&c->vc.lock, flags);444}445 446static void k3_dma_fill_desc(struct k3_dma_desc_sw *ds, dma_addr_t dst,447			dma_addr_t src, size_t len, u32 num, u32 ccfg)448{449	if (num != ds->desc_num - 1)450		ds->desc_hw[num].lli = ds->desc_hw_lli + (num + 1) *451			sizeof(struct k3_desc_hw);452 453	ds->desc_hw[num].lli |= CX_LLI_CHAIN_EN;454	ds->desc_hw[num].count = len;455	ds->desc_hw[num].saddr = src;456	ds->desc_hw[num].daddr = dst;457	ds->desc_hw[num].config = ccfg;458}459 460static struct k3_dma_desc_sw *k3_dma_alloc_desc_resource(int num,461							struct dma_chan *chan)462{463	struct k3_dma_chan *c = to_k3_chan(chan);464	struct k3_dma_desc_sw *ds;465	struct k3_dma_dev *d = to_k3_dma(chan->device);466	int lli_limit = LLI_BLOCK_SIZE / sizeof(struct k3_desc_hw);467 468	if (num > lli_limit) {469		dev_dbg(chan->device->dev, "vch %p: sg num %d exceed max %d\n",470			&c->vc, num, lli_limit);471		return NULL;472	}473 474	ds = kzalloc(sizeof(*ds), GFP_NOWAIT);475	if (!ds)476		return NULL;477 478	ds->desc_hw = dma_pool_zalloc(d->pool, GFP_NOWAIT, &ds->desc_hw_lli);479	if (!ds->desc_hw) {480		dev_dbg(chan->device->dev, "vch %p: dma alloc fail\n", &c->vc);481		kfree(ds);482		return NULL;483	}484	ds->desc_num = num;485	return ds;486}487 488static struct dma_async_tx_descriptor *k3_dma_prep_memcpy(489	struct dma_chan *chan,	dma_addr_t dst, dma_addr_t src,490	size_t len, unsigned long flags)491{492	struct k3_dma_chan *c = to_k3_chan(chan);493	struct k3_dma_desc_sw *ds;494	size_t copy = 0;495	int num = 0;496 497	if (!len)498		return NULL;499 500	num = DIV_ROUND_UP(len, DMA_MAX_SIZE);501 502	ds = k3_dma_alloc_desc_resource(num, chan);503	if (!ds)504		return NULL;505 506	c->cyclic = 0;507	ds->size = len;508	num = 0;509 510	if (!c->ccfg) {511		/* default is memtomem, without calling device_config */512		c->ccfg = CX_CFG_SRCINCR | CX_CFG_DSTINCR | CX_CFG_EN;513		c->ccfg |= (0xf << 20) | (0xf << 24);	/* burst = 16 */514		c->ccfg |= (0x3 << 12) | (0x3 << 16);	/* width = 64 bit */515	}516 517	do {518		copy = min_t(size_t, len, DMA_MAX_SIZE);519		k3_dma_fill_desc(ds, dst, src, copy, num++, c->ccfg);520 521		src += copy;522		dst += copy;523		len -= copy;524	} while (len);525 526	ds->desc_hw[num-1].lli = 0;	/* end of link */527	return vchan_tx_prep(&c->vc, &ds->vd, flags);528}529 530static struct dma_async_tx_descriptor *k3_dma_prep_slave_sg(531	struct dma_chan *chan, struct scatterlist *sgl, unsigned int sglen,532	enum dma_transfer_direction dir, unsigned long flags, void *context)533{534	struct k3_dma_chan *c = to_k3_chan(chan);535	struct k3_dma_desc_sw *ds;536	size_t len, avail, total = 0;537	struct scatterlist *sg;538	dma_addr_t addr, src = 0, dst = 0;539	int num = sglen, i;540 541	if (sgl == NULL)542		return NULL;543 544	c->cyclic = 0;545 546	for_each_sg(sgl, sg, sglen, i) {547		avail = sg_dma_len(sg);548		if (avail > DMA_MAX_SIZE)549			num += DIV_ROUND_UP(avail, DMA_MAX_SIZE) - 1;550	}551 552	ds = k3_dma_alloc_desc_resource(num, chan);553	if (!ds)554		return NULL;555	num = 0;556	k3_dma_config_write(chan, dir, &c->slave_config);557 558	for_each_sg(sgl, sg, sglen, i) {559		addr = sg_dma_address(sg);560		avail = sg_dma_len(sg);561		total += avail;562 563		do {564			len = min_t(size_t, avail, DMA_MAX_SIZE);565 566			if (dir == DMA_MEM_TO_DEV) {567				src = addr;568				dst = c->dev_addr;569			} else if (dir == DMA_DEV_TO_MEM) {570				src = c->dev_addr;571				dst = addr;572			}573 574			k3_dma_fill_desc(ds, dst, src, len, num++, c->ccfg);575 576			addr += len;577			avail -= len;578		} while (avail);579	}580 581	ds->desc_hw[num-1].lli = 0;	/* end of link */582	ds->size = total;583	return vchan_tx_prep(&c->vc, &ds->vd, flags);584}585 586static struct dma_async_tx_descriptor *587k3_dma_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr,588		       size_t buf_len, size_t period_len,589		       enum dma_transfer_direction dir,590		       unsigned long flags)591{592	struct k3_dma_chan *c = to_k3_chan(chan);593	struct k3_dma_desc_sw *ds;594	size_t len, avail, total = 0;595	dma_addr_t addr, src = 0, dst = 0;596	int num = 1, since = 0;597	size_t modulo = DMA_CYCLIC_MAX_PERIOD;598	u32 en_tc2 = 0;599 600	dev_dbg(chan->device->dev, "%s: buf %pad, dst %pad, buf len %zu, period_len = %zu, dir %d\n",601	       __func__, &buf_addr, &to_k3_chan(chan)->dev_addr,602	       buf_len, period_len, (int)dir);603 604	avail = buf_len;605	if (avail > modulo)606		num += DIV_ROUND_UP(avail, modulo) - 1;607 608	ds = k3_dma_alloc_desc_resource(num, chan);609	if (!ds)610		return NULL;611 612	c->cyclic = 1;613	addr = buf_addr;614	avail = buf_len;615	total = avail;616	num = 0;617	k3_dma_config_write(chan, dir, &c->slave_config);618 619	if (period_len < modulo)620		modulo = period_len;621 622	do {623		len = min_t(size_t, avail, modulo);624 625		if (dir == DMA_MEM_TO_DEV) {626			src = addr;627			dst = c->dev_addr;628		} else if (dir == DMA_DEV_TO_MEM) {629			src = c->dev_addr;630			dst = addr;631		}632		since += len;633		if (since >= period_len) {634			/* descriptor asks for TC2 interrupt on completion */635			en_tc2 = CX_CFG_NODEIRQ;636			since -= period_len;637		} else638			en_tc2 = 0;639 640		k3_dma_fill_desc(ds, dst, src, len, num++, c->ccfg | en_tc2);641 642		addr += len;643		avail -= len;644	} while (avail);645 646	/* "Cyclic" == end of link points back to start of link */647	ds->desc_hw[num - 1].lli |= ds->desc_hw_lli;648 649	ds->size = total;650 651	return vchan_tx_prep(&c->vc, &ds->vd, flags);652}653 654static int k3_dma_config(struct dma_chan *chan,655			 struct dma_slave_config *cfg)656{657	struct k3_dma_chan *c = to_k3_chan(chan);658 659	memcpy(&c->slave_config, cfg, sizeof(*cfg));660 661	return 0;662}663 664static int k3_dma_config_write(struct dma_chan *chan,665			       enum dma_transfer_direction dir,666			       struct dma_slave_config *cfg)667{668	struct k3_dma_chan *c = to_k3_chan(chan);669	u32 maxburst = 0, val = 0;670	enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED;671 672	if (dir == DMA_DEV_TO_MEM) {673		c->ccfg = CX_CFG_DSTINCR;674		c->dev_addr = cfg->src_addr;675		maxburst = cfg->src_maxburst;676		width = cfg->src_addr_width;677	} else if (dir == DMA_MEM_TO_DEV) {678		c->ccfg = CX_CFG_SRCINCR;679		c->dev_addr = cfg->dst_addr;680		maxburst = cfg->dst_maxburst;681		width = cfg->dst_addr_width;682	}683	switch (width) {684	case DMA_SLAVE_BUSWIDTH_1_BYTE:685	case DMA_SLAVE_BUSWIDTH_2_BYTES:686	case DMA_SLAVE_BUSWIDTH_4_BYTES:687	case DMA_SLAVE_BUSWIDTH_8_BYTES:688		val =  __ffs(width);689		break;690	default:691		val = 3;692		break;693	}694	c->ccfg |= (val << 12) | (val << 16);695 696	if ((maxburst == 0) || (maxburst > 16))697		val = 15;698	else699		val = maxburst - 1;700	c->ccfg |= (val << 20) | (val << 24);701	c->ccfg |= CX_CFG_MEM2PER | CX_CFG_EN;702 703	/* specific request line */704	c->ccfg |= c->vc.chan.chan_id << 4;705 706	return 0;707}708 709static void k3_dma_free_desc(struct virt_dma_desc *vd)710{711	struct k3_dma_desc_sw *ds =712		container_of(vd, struct k3_dma_desc_sw, vd);713	struct k3_dma_dev *d = to_k3_dma(vd->tx.chan->device);714 715	dma_pool_free(d->pool, ds->desc_hw, ds->desc_hw_lli);716	kfree(ds);717}718 719static int k3_dma_terminate_all(struct dma_chan *chan)720{721	struct k3_dma_chan *c = to_k3_chan(chan);722	struct k3_dma_dev *d = to_k3_dma(chan->device);723	struct k3_dma_phy *p = c->phy;724	unsigned long flags;725	LIST_HEAD(head);726 727	dev_dbg(d->slave.dev, "vchan %p: terminate all\n", &c->vc);728 729	/* Prevent this channel being scheduled */730	spin_lock(&d->lock);731	list_del_init(&c->node);732	spin_unlock(&d->lock);733 734	/* Clear the tx descriptor lists */735	spin_lock_irqsave(&c->vc.lock, flags);736	vchan_get_all_descriptors(&c->vc, &head);737	if (p) {738		/* vchan is assigned to a pchan - stop the channel */739		k3_dma_terminate_chan(p, d);740		c->phy = NULL;741		p->vchan = NULL;742		if (p->ds_run) {743			vchan_terminate_vdesc(&p->ds_run->vd);744			p->ds_run = NULL;745		}746		p->ds_done = NULL;747	}748	spin_unlock_irqrestore(&c->vc.lock, flags);749	vchan_dma_desc_free_list(&c->vc, &head);750 751	return 0;752}753 754static void k3_dma_synchronize(struct dma_chan *chan)755{756	struct k3_dma_chan *c = to_k3_chan(chan);757 758	vchan_synchronize(&c->vc);759}760 761static int k3_dma_transfer_pause(struct dma_chan *chan)762{763	struct k3_dma_chan *c = to_k3_chan(chan);764	struct k3_dma_dev *d = to_k3_dma(chan->device);765	struct k3_dma_phy *p = c->phy;766 767	dev_dbg(d->slave.dev, "vchan %p: pause\n", &c->vc);768	if (c->status == DMA_IN_PROGRESS) {769		c->status = DMA_PAUSED;770		if (p) {771			k3_dma_pause_dma(p, false);772		} else {773			spin_lock(&d->lock);774			list_del_init(&c->node);775			spin_unlock(&d->lock);776		}777	}778 779	return 0;780}781 782static int k3_dma_transfer_resume(struct dma_chan *chan)783{784	struct k3_dma_chan *c = to_k3_chan(chan);785	struct k3_dma_dev *d = to_k3_dma(chan->device);786	struct k3_dma_phy *p = c->phy;787	unsigned long flags;788 789	dev_dbg(d->slave.dev, "vchan %p: resume\n", &c->vc);790	spin_lock_irqsave(&c->vc.lock, flags);791	if (c->status == DMA_PAUSED) {792		c->status = DMA_IN_PROGRESS;793		if (p) {794			k3_dma_pause_dma(p, true);795		} else if (!list_empty(&c->vc.desc_issued)) {796			spin_lock(&d->lock);797			list_add_tail(&c->node, &d->chan_pending);798			spin_unlock(&d->lock);799		}800	}801	spin_unlock_irqrestore(&c->vc.lock, flags);802 803	return 0;804}805 806static const struct k3dma_soc_data k3_v1_dma_data = {807	.flags = 0,808};809 810static const struct k3dma_soc_data asp_v1_dma_data = {811	.flags = K3_FLAG_NOCLK,812};813 814static const struct of_device_id k3_pdma_dt_ids[] = {815	{ .compatible = "hisilicon,k3-dma-1.0",816	  .data = &k3_v1_dma_data817	},818	{ .compatible = "hisilicon,hisi-pcm-asp-dma-1.0",819	  .data = &asp_v1_dma_data820	},821	{}822};823MODULE_DEVICE_TABLE(of, k3_pdma_dt_ids);824 825static struct dma_chan *k3_of_dma_simple_xlate(struct of_phandle_args *dma_spec,826						struct of_dma *ofdma)827{828	struct k3_dma_dev *d = ofdma->of_dma_data;829	unsigned int request = dma_spec->args[0];830 831	if (request >= d->dma_requests)832		return NULL;833 834	return dma_get_slave_channel(&(d->chans[request].vc.chan));835}836 837static int k3_dma_probe(struct platform_device *op)838{839	const struct k3dma_soc_data *soc_data;840	struct k3_dma_dev *d;841	int i, ret, irq = 0;842 843	d = devm_kzalloc(&op->dev, sizeof(*d), GFP_KERNEL);844	if (!d)845		return -ENOMEM;846 847	soc_data = device_get_match_data(&op->dev);848	if (!soc_data)849		return -EINVAL;850 851	d->base = devm_platform_ioremap_resource(op, 0);852	if (IS_ERR(d->base))853		return PTR_ERR(d->base);854 855	of_property_read_u32((&op->dev)->of_node,856			"dma-channels", &d->dma_channels);857	of_property_read_u32((&op->dev)->of_node,858			"dma-requests", &d->dma_requests);859	ret = of_property_read_u32((&op->dev)->of_node,860			"dma-channel-mask", &d->dma_channel_mask);861	if (ret) {862		dev_warn(&op->dev,863			 "dma-channel-mask doesn't exist, considering all as available.\n");864		d->dma_channel_mask = (u32)~0UL;865	}866 867	if (!(soc_data->flags & K3_FLAG_NOCLK)) {868		d->clk = devm_clk_get(&op->dev, NULL);869		if (IS_ERR(d->clk)) {870			dev_err(&op->dev, "no dma clk\n");871			return PTR_ERR(d->clk);872		}873	}874 875	irq = platform_get_irq(op, 0);876	ret = devm_request_irq(&op->dev, irq,877			k3_dma_int_handler, 0, DRIVER_NAME, d);878	if (ret)879		return ret;880 881	d->irq = irq;882 883	/* A DMA memory pool for LLIs, align on 32-byte boundary */884	d->pool = dmam_pool_create(DRIVER_NAME, &op->dev,885					LLI_BLOCK_SIZE, 32, 0);886	if (!d->pool)887		return -ENOMEM;888 889	/* init phy channel */890	d->phy = devm_kcalloc(&op->dev,891		d->dma_channels, sizeof(struct k3_dma_phy), GFP_KERNEL);892	if (d->phy == NULL)893		return -ENOMEM;894 895	for (i = 0; i < d->dma_channels; i++) {896		struct k3_dma_phy *p;897 898		if (!(d->dma_channel_mask & BIT(i)))899			continue;900 901		p = &d->phy[i];902		p->idx = i;903		p->base = d->base + i * 0x40;904	}905 906	INIT_LIST_HEAD(&d->slave.channels);907	dma_cap_set(DMA_SLAVE, d->slave.cap_mask);908	dma_cap_set(DMA_MEMCPY, d->slave.cap_mask);909	dma_cap_set(DMA_CYCLIC, d->slave.cap_mask);910	d->slave.dev = &op->dev;911	d->slave.device_free_chan_resources = k3_dma_free_chan_resources;912	d->slave.device_tx_status = k3_dma_tx_status;913	d->slave.device_prep_dma_memcpy = k3_dma_prep_memcpy;914	d->slave.device_prep_slave_sg = k3_dma_prep_slave_sg;915	d->slave.device_prep_dma_cyclic = k3_dma_prep_dma_cyclic;916	d->slave.device_issue_pending = k3_dma_issue_pending;917	d->slave.device_config = k3_dma_config;918	d->slave.device_pause = k3_dma_transfer_pause;919	d->slave.device_resume = k3_dma_transfer_resume;920	d->slave.device_terminate_all = k3_dma_terminate_all;921	d->slave.device_synchronize = k3_dma_synchronize;922	d->slave.copy_align = DMAENGINE_ALIGN_8_BYTES;923 924	/* init virtual channel */925	d->chans = devm_kcalloc(&op->dev,926		d->dma_requests, sizeof(struct k3_dma_chan), GFP_KERNEL);927	if (d->chans == NULL)928		return -ENOMEM;929 930	for (i = 0; i < d->dma_requests; i++) {931		struct k3_dma_chan *c = &d->chans[i];932 933		c->status = DMA_IN_PROGRESS;934		INIT_LIST_HEAD(&c->node);935		c->vc.desc_free = k3_dma_free_desc;936		vchan_init(&c->vc, &d->slave);937	}938 939	/* Enable clock before accessing registers */940	ret = clk_prepare_enable(d->clk);941	if (ret < 0) {942		dev_err(&op->dev, "clk_prepare_enable failed: %d\n", ret);943		return ret;944	}945 946	k3_dma_enable_dma(d, true);947 948	ret = dma_async_device_register(&d->slave);949	if (ret)950		goto dma_async_register_fail;951 952	ret = of_dma_controller_register((&op->dev)->of_node,953					k3_of_dma_simple_xlate, d);954	if (ret)955		goto of_dma_register_fail;956 957	spin_lock_init(&d->lock);958	INIT_LIST_HEAD(&d->chan_pending);959	tasklet_setup(&d->task, k3_dma_tasklet);960	platform_set_drvdata(op, d);961	dev_info(&op->dev, "initialized\n");962 963	return 0;964 965of_dma_register_fail:966	dma_async_device_unregister(&d->slave);967dma_async_register_fail:968	clk_disable_unprepare(d->clk);969	return ret;970}971 972static void k3_dma_remove(struct platform_device *op)973{974	struct k3_dma_chan *c, *cn;975	struct k3_dma_dev *d = platform_get_drvdata(op);976 977	dma_async_device_unregister(&d->slave);978	of_dma_controller_free((&op->dev)->of_node);979 980	devm_free_irq(&op->dev, d->irq, d);981 982	list_for_each_entry_safe(c, cn, &d->slave.channels, vc.chan.device_node) {983		list_del(&c->vc.chan.device_node);984		tasklet_kill(&c->vc.task);985	}986	tasklet_kill(&d->task);987	clk_disable_unprepare(d->clk);988}989 990#ifdef CONFIG_PM_SLEEP991static int k3_dma_suspend_dev(struct device *dev)992{993	struct k3_dma_dev *d = dev_get_drvdata(dev);994	u32 stat = 0;995 996	stat = k3_dma_get_chan_stat(d);997	if (stat) {998		dev_warn(d->slave.dev,999			"chan %d is running fail to suspend\n", stat);1000		return -1;1001	}1002	k3_dma_enable_dma(d, false);1003	clk_disable_unprepare(d->clk);1004	return 0;1005}1006 1007static int k3_dma_resume_dev(struct device *dev)1008{1009	struct k3_dma_dev *d = dev_get_drvdata(dev);1010	int ret = 0;1011 1012	ret = clk_prepare_enable(d->clk);1013	if (ret < 0) {1014		dev_err(d->slave.dev, "clk_prepare_enable failed: %d\n", ret);1015		return ret;1016	}1017	k3_dma_enable_dma(d, true);1018	return 0;1019}1020#endif1021 1022static SIMPLE_DEV_PM_OPS(k3_dma_pmops, k3_dma_suspend_dev, k3_dma_resume_dev);1023 1024static struct platform_driver k3_pdma_driver = {1025	.driver		= {1026		.name	= DRIVER_NAME,1027		.pm	= &k3_dma_pmops,1028		.of_match_table = k3_pdma_dt_ids,1029	},1030	.probe		= k3_dma_probe,1031	.remove_new	= k3_dma_remove,1032};1033 1034module_platform_driver(k3_pdma_driver);1035 1036MODULE_DESCRIPTION("HiSilicon k3 DMA Driver");1037MODULE_ALIAS("platform:k3dma");1038MODULE_LICENSE("GPL v2");1039