new file mode 100644
@@ -0,0 +1,46 @@
+* Hisilicon K3 DMA controller
+
+See dma.txt first
+
+Required properties:
+- compatible: Should be "hisilicon,k3-dma-1.0"
+- reg: Should contain DMA registers location and length.
+- interrupts: Should contain one interrupt shared by all channel
+- #dma-cells: see dma.txt, should be 1, para number
+- dma-channels: physical channels supported
+- dma-requests: virtual channels supported, each virtual channel
+ have specific request line
+- clocks: clock required
+
+Example:
+
+Controller:
+ dma0: dma@fcd02000 {
+ compatible = "hisilicon,k3-dma-1.0";
+ reg = <0xfcd02000 0x1000>;
+ #dma-cells = <1>;
+ dma-channels = <16>;
+ dma-requests = <27>;
+ interrupts = <0 12 4>;
+ clocks = <&pclk>;
+ status = "disable";
+ };
+
+Client:
+Use specific request line passing from dmax
+For example, i2c0 read channel request line is 18, while write channel use 19
+
+ i2c0: i2c@fcb08000 {
+ compatible = "snps,designware-i2c";
+ dmas = <&dma0 18 /* read channel */
+ &dma0 19>; /* write channel */
+ dma-names = "rx", "tx";
+ };
+
+ i2c1: i2c@fcb09000 {
+ compatible = "snps,designware-i2c";
+ dmas = <&dma0 20 /* read channel */
+ &dma0 21>; /* write channel */
+ dma-names = "rx", "tx";
+ };
+
@@ -300,6 +300,15 @@ config DMA_JZ4740
select DMA_ENGINE
select DMA_VIRTUAL_CHANNELS
+config K3_DMA
+ tristate "Hisilicon K3 DMA support"
+ depends on ARCH_HI3xxx
+ select DMA_ENGINE
+ select DMA_VIRTUAL_CHANNELS
+ help
+ Support the DMA engine for Hisilicon K3 platform
+ devices.
+
config DMA_ENGINE
bool
@@ -39,3 +39,4 @@ obj-$(CONFIG_MMP_TDMA) += mmp_tdma.o
obj-$(CONFIG_DMA_OMAP) += omap-dma.o
obj-$(CONFIG_MMP_PDMA) += mmp_pdma.o
obj-$(CONFIG_DMA_JZ4740) += dma-jz4740.o
+obj-$(CONFIG_K3_DMA) += k3dma.o
new file mode 100644
@@ -0,0 +1,837 @@
+/*
+ * Copyright (c) 2013 Linaro Ltd.
+ * Copyright (c) 2013 Hisilicon Limited.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/sched.h>
+#include <linux/device.h>
+#include <linux/dmaengine.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/of_device.h>
+#include <linux/of.h>
+#include <linux/clk.h>
+#include <linux/of_dma.h>
+
+#include "virt-dma.h"
+
+#define DRIVER_NAME "k3-dma"
+#define DMA_ALIGN 3
+#define DMA_MAX_SIZE 0x1ffc
+
+#define INT_STAT 0x00
+#define INT_TC1 0x04
+#define INT_ERR1 0x0c
+#define INT_ERR2 0x10
+#define INT_TC1_MASK 0x18
+#define INT_ERR1_MASK 0x20
+#define INT_ERR2_MASK 0x24
+#define INT_TC1_RAW 0x600
+#define INT_ERR1_RAW 0x608
+#define INT_ERR2_RAW 0x610
+#define CH_PRI 0x688
+#define CH_STAT 0x690
+#define CX_CUR_CNT 0x704
+#define CX_LLI 0x800
+#define CX_CNT 0x810
+#define CX_SRC 0x814
+#define CX_DST 0x818
+#define CX_CFG 0x81c
+#define AXI_CFG 0x820
+#define AXI_CFG_DEFAULT 0x201201
+
+#define CX_LLI_CHAIN_EN 0x2
+#define CX_CFG_EN 0x1
+#define CX_CFG_MEM2PER (0x1 << 2)
+#define CX_CFG_PER2MEM (0x2 << 2)
+#define CX_CFG_SRCINCR (0x1 << 31)
+#define CX_CFG_DSTINCR (0x1 << 30)
+
+struct k3_desc_hw {
+ u32 lli;
+ u32 reserved[3];
+ u32 count;
+ u32 saddr;
+ u32 daddr;
+ u32 config;
+} __aligned(32);
+
+struct k3_dma_desc_sw {
+ struct virt_dma_desc vd;
+ dma_addr_t desc_hw_lli;
+ size_t desc_num;
+ size_t size;
+ struct k3_desc_hw desc_hw[0];
+};
+
+struct k3_dma_phy;
+
+struct k3_dma_chan {
+ u32 ccfg;
+ struct virt_dma_chan vc;
+ struct k3_dma_phy *phy;
+ struct list_head node;
+ enum dma_transfer_direction dir;
+ dma_addr_t dev_addr;
+ enum dma_status status;
+};
+
+struct k3_dma_phy {
+ u32 idx;
+ void __iomem *base;
+ struct k3_dma_chan *vchan;
+ struct k3_dma_desc_sw *ds_run;
+ struct k3_dma_desc_sw *ds_done;
+};
+
+struct k3_dma_dev {
+ struct dma_device slave;
+ void __iomem *base;
+ struct tasklet_struct task;
+ spinlock_t lock;
+ struct list_head chan_pending;
+ struct k3_dma_phy *phy;
+ struct k3_dma_chan *chans;
+ struct clk *clk;
+ u32 dma_channels;
+ u32 dma_requests;
+};
+
+#define to_k3_dma(dmadev) container_of(dmadev, struct k3_dma_dev, slave)
+
+static struct k3_dma_chan *to_k3_chan(struct dma_chan *chan)
+{
+ return container_of(chan, struct k3_dma_chan, vc.chan);
+}
+
+static void k3_dma_pause_dma(struct k3_dma_phy *phy, bool on)
+{
+ u32 val = 0;
+
+ if (on) {
+ val = readl_relaxed(phy->base + CX_CFG);
+ val |= CX_CFG_EN;
+ writel_relaxed(val, phy->base + CX_CFG);
+ } else {
+ val = readl_relaxed(phy->base + CX_CFG);
+ val &= ~CX_CFG_EN;
+ writel_relaxed(val, phy->base + CX_CFG);
+ }
+}
+
+static void k3_dma_terminate_chan(struct k3_dma_phy *phy, struct k3_dma_dev *d)
+{
+ u32 val = 0;
+
+ k3_dma_pause_dma(phy, false);
+
+ val = 0x1 << phy->idx;
+ writel_relaxed(val, d->base + INT_TC1_RAW);
+ writel_relaxed(val, d->base + INT_ERR1_RAW);
+ writel_relaxed(val, d->base + INT_ERR2_RAW);
+}
+
+static void k3_dma_set_desc(struct k3_dma_phy *phy, struct k3_desc_hw *hw)
+{
+ writel_relaxed(hw->lli, phy->base + CX_LLI);
+ writel_relaxed(hw->count, phy->base + CX_CNT);
+ writel_relaxed(hw->saddr, phy->base + CX_SRC);
+ writel_relaxed(hw->daddr, phy->base + CX_DST);
+ writel_relaxed(AXI_CFG_DEFAULT, phy->base + AXI_CFG);
+ writel_relaxed(hw->config, phy->base + CX_CFG);
+}
+
+static u32 k3_dma_get_curr_cnt(struct k3_dma_dev *d, struct k3_dma_phy *phy)
+{
+ u32 cnt = 0;
+
+ cnt = readl_relaxed(d->base + CX_CUR_CNT + phy->idx * 0x10);
+ cnt &= 0xffff;
+ return cnt;
+}
+
+static u32 k3_dma_get_curr_lli(struct k3_dma_phy *phy)
+{
+ return readl_relaxed(phy->base + CX_LLI);
+}
+
+static u32 k3_dma_get_chan_stat(struct k3_dma_dev *d)
+{
+ return readl_relaxed(d->base + CH_STAT);
+}
+
+static void k3_dma_enable_dma(struct k3_dma_dev *d, bool on)
+{
+ if (on) {
+ /* set same priority */
+ writel_relaxed(0x0, d->base + CH_PRI);
+
+ /* unmask irq */
+ writel_relaxed(0xffff, d->base + INT_TC1_MASK);
+ writel_relaxed(0xffff, d->base + INT_ERR1_MASK);
+ writel_relaxed(0xffff, d->base + INT_ERR2_MASK);
+ } else {
+ /* mask irq */
+ writel_relaxed(0x0, d->base + INT_TC1_MASK);
+ writel_relaxed(0x0, d->base + INT_ERR1_MASK);
+ writel_relaxed(0x0, d->base + INT_ERR2_MASK);
+ }
+}
+
+static irqreturn_t k3_dma_int_handler(int irq, void *dev_id)
+{
+ struct k3_dma_dev *d = (struct k3_dma_dev *)dev_id;
+ struct k3_dma_phy *p;
+ struct k3_dma_chan *c;
+ u32 stat = readl_relaxed(d->base + INT_STAT);
+ u32 tc1 = readl_relaxed(d->base + INT_TC1);
+ u32 err1 = readl_relaxed(d->base + INT_ERR1);
+ u32 err2 = readl_relaxed(d->base + INT_ERR2);
+ u32 i, irq_chan = 0;
+
+ while (stat) {
+ i = __ffs(stat);
+ stat &= (stat - 1);
+ if (likely(tc1 & BIT(i))) {
+ p = &d->phy[i];
+ c = p->vchan;
+ if (c) {
+ unsigned long flags;
+
+ spin_lock_irqsave(&c->vc.lock, flags);
+ vchan_cookie_complete(&p->ds_run->vd);
+ p->ds_done = p->ds_run;
+ spin_unlock_irqrestore(&c->vc.lock, flags);
+ }
+ irq_chan |= BIT(i);
+ }
+ if (unlikely((err1 & BIT(i)) || (err2 & BIT(i))))
+ dev_warn(d->slave.dev, "DMA ERR\n");
+ }
+
+ writel_relaxed(irq_chan, d->base + INT_TC1_RAW);
+ writel_relaxed(err1, d->base + INT_ERR1_RAW);
+ writel_relaxed(err2, d->base + INT_ERR2_RAW);
+
+ if (irq_chan) {
+ tasklet_schedule(&d->task);
+ return IRQ_HANDLED;
+ } else
+ return IRQ_NONE;
+}
+
+static int k3_dma_start_txd(struct k3_dma_chan *c)
+{
+ struct k3_dma_dev *d = to_k3_dma(c->vc.chan.device);
+ struct virt_dma_desc *vd = vchan_next_desc(&c->vc);
+
+ if (!c->phy)
+ return -EAGAIN;
+
+ if (BIT(c->phy->idx) & k3_dma_get_chan_stat(d))
+ return -EAGAIN;
+
+ if (vd) {
+ struct k3_dma_desc_sw *ds =
+ container_of(vd, struct k3_dma_desc_sw, vd);
+ /*
+ * fetch and remove request from vc->desc_issued
+ * so vc->desc_issued only contains desc pending
+ */
+ list_del(&ds->vd.node);
+ c->phy->ds_run = ds;
+ c->phy->ds_done = NULL;
+ /* start dma */
+ k3_dma_set_desc(c->phy, &ds->desc_hw[0]);
+ return 0;
+ }
+ c->phy->ds_done = NULL;
+ c->phy->ds_run = NULL;
+ return -EAGAIN;
+}
+
+static void k3_dma_tasklet(unsigned long arg)
+{
+ struct k3_dma_dev *d = (struct k3_dma_dev *)arg;
+ struct k3_dma_phy *p;
+ struct k3_dma_chan *c, *cn;
+ unsigned pch, pch_alloc = 0;
+
+ /* check new dma request of running channel in vc->desc_issued */
+ list_for_each_entry_safe(c, cn, &d->slave.channels, vc.chan.device_node) {
+ spin_lock_irq(&c->vc.lock);
+ p = c->phy;
+ if (p && p->ds_done) {
+ if (k3_dma_start_txd(c)) {
+ /* No current txd associated with this channel */
+ dev_dbg(d->slave.dev, "pchan %u: free\n", p->idx);
+ /* Mark this channel free */
+ c->phy = NULL;
+ p->vchan = NULL;
+ }
+ }
+ spin_unlock_irq(&c->vc.lock);
+ }
+
+ /* check new channel request in d->chan_pending */
+ spin_lock_irq(&d->lock);
+ for (pch = 0; pch < d->dma_channels; pch++) {
+ p = &d->phy[pch];
+
+ if (p->vchan == NULL && !list_empty(&d->chan_pending)) {
+ c = list_first_entry(&d->chan_pending,
+ struct k3_dma_chan, node);
+ /* remove from d->chan_pending */
+ list_del_init(&c->node);
+ pch_alloc |= 1 << pch;
+ /* Mark this channel allocated */
+ p->vchan = c;
+ c->phy = p;
+ dev_dbg(d->slave.dev, "pchan %u: alloc vchan %p\n", pch, &c->vc);
+ }
+ }
+ spin_unlock_irq(&d->lock);
+
+ for (pch = 0; pch < d->dma_channels; pch++) {
+ if (pch_alloc & (1 << pch)) {
+ p = &d->phy[pch];
+ c = p->vchan;
+ if (c) {
+ spin_lock_irq(&c->vc.lock);
+ k3_dma_start_txd(c);
+ spin_unlock_irq(&c->vc.lock);
+ }
+ }
+ }
+}
+
+static int k3_dma_alloc_chan_resources(struct dma_chan *chan)
+{
+ return 0;
+}
+
+static void k3_dma_free_chan_resources(struct dma_chan *chan)
+{
+ struct k3_dma_chan *c = to_k3_chan(chan);
+ struct k3_dma_dev *d = to_k3_dma(chan->device);
+ unsigned long flags;
+
+ spin_lock_irqsave(&d->lock, flags);
+ list_del_init(&c->node);
+ spin_unlock_irqrestore(&d->lock, flags);
+
+ vchan_free_chan_resources(&c->vc);
+ c->ccfg = 0;
+}
+
+static enum dma_status k3_dma_tx_status(struct dma_chan *chan,
+ dma_cookie_t cookie, struct dma_tx_state *state)
+{
+ struct k3_dma_chan *c = to_k3_chan(chan);
+ struct k3_dma_dev *d = to_k3_dma(chan->device);
+ struct k3_dma_phy *p;
+ struct virt_dma_desc *vd;
+ unsigned long flags;
+ enum dma_status ret;
+ size_t bytes = 0;
+
+ ret = dma_cookie_status(&c->vc.chan, cookie, state);
+ if (ret == DMA_SUCCESS)
+ return ret;
+
+ spin_lock_irqsave(&c->vc.lock, flags);
+ p = c->phy;
+ ret = c->status;
+
+ /*
+ * If the cookie is on our issue queue, then the residue is
+ * its total size.
+ */
+ vd = vchan_find_desc(&c->vc, cookie);
+ if (vd) {
+ bytes = container_of(vd, struct k3_dma_desc_sw, vd)->size;
+ } else if ((!p) || (!p->ds_run)) {
+ bytes = 0;
+ } else {
+ struct k3_dma_desc_sw *ds = p->ds_run;
+ u32 clli = 0, index = 0;
+
+ bytes = k3_dma_get_curr_cnt(d, p);
+ clli = k3_dma_get_curr_lli(p);
+ index = (clli - ds->desc_hw_lli) / sizeof(struct k3_desc_hw);
+ for (; index < ds->desc_num; index++) {
+ bytes += ds->desc_hw[index].count;
+ /* end of lli */
+ if (!ds->desc_hw[index].lli)
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&c->vc.lock, flags);
+ dma_set_residue(state, bytes);
+ return ret;
+}
+
+static void k3_dma_issue_pending(struct dma_chan *chan)
+{
+ struct k3_dma_chan *c = to_k3_chan(chan);
+ struct k3_dma_dev *d = to_k3_dma(chan->device);
+ unsigned long flags;
+
+ spin_lock_irqsave(&c->vc.lock, flags);
+ /* add request to vc->desc_issued */
+ if (vchan_issue_pending(&c->vc)) {
+ spin_lock(&d->lock);
+ if (!c->phy) {
+ if (list_empty(&c->node)) {
+ /* if new channel, add chan_pending */
+ list_add_tail(&c->node, &d->chan_pending);
+ /* check in tasklet */
+ tasklet_schedule(&d->task);
+ dev_dbg(d->slave.dev, "vchan %p: issued\n", &c->vc);
+ }
+ }
+ spin_unlock(&d->lock);
+ } else
+ dev_dbg(d->slave.dev, "vchan %p: nothing to issue\n", &c->vc);
+ spin_unlock_irqrestore(&c->vc.lock, flags);
+}
+
+static void k3_dma_fill_desc(struct k3_dma_desc_sw *ds, dma_addr_t dst,
+ dma_addr_t src, size_t len, u32 num, u32 ccfg)
+{
+ if ((num + 1) < ds->desc_num)
+ ds->desc_hw[num].lli = ds->desc_hw_lli + (num + 1) *
+ sizeof(struct k3_desc_hw);
+ ds->desc_hw[num].lli |= CX_LLI_CHAIN_EN;
+ ds->desc_hw[num].count = len;
+ ds->desc_hw[num].saddr = src;
+ ds->desc_hw[num].daddr = dst;
+ ds->desc_hw[num].config = ccfg;
+}
+
+static struct dma_async_tx_descriptor *k3_dma_prep_memcpy(
+ struct dma_chan *chan, dma_addr_t dst, dma_addr_t src,
+ size_t len, unsigned long flags)
+{
+ struct k3_dma_chan *c = to_k3_chan(chan);
+ struct k3_dma_desc_sw *ds;
+ size_t copy = 0;
+ int num = 0;
+
+ if (!len)
+ return NULL;
+
+ num = DIV_ROUND_UP(len, DMA_MAX_SIZE);
+ ds = kzalloc(sizeof(*ds) + num * sizeof(ds->desc_hw[0]), GFP_ATOMIC);
+ if (!ds) {
+ dev_dbg(chan->device->dev, "vchan %p: kzalloc fail\n", &c->vc);
+ return NULL;
+ }
+ ds->desc_hw_lli = __virt_to_phys((unsigned long)&ds->desc_hw[0]);
+ ds->size = len;
+ ds->desc_num = num;
+ num = 0;
+
+ if (!c->ccfg) {
+ /* default is memtomem, without calling device_control */
+ c->ccfg = CX_CFG_SRCINCR | CX_CFG_DSTINCR | CX_CFG_EN;
+ c->ccfg |= (0xf << 20) | (0xf << 24); /* burst = 16 */
+ c->ccfg |= (0x3 << 12) | (0x3 << 16); /* width = 64 bit */
+ }
+
+ do {
+ copy = min_t(size_t, len, DMA_MAX_SIZE);
+ k3_dma_fill_desc(ds, dst, src, copy, num++, c->ccfg);
+
+ if (c->dir == DMA_MEM_TO_DEV) {
+ src += copy;
+ } else if (c->dir == DMA_DEV_TO_MEM) {
+ dst += copy;
+ } else {
+ src += copy;
+ dst += copy;
+ }
+ len -= copy;
+ } while (len);
+
+ ds->desc_hw[num-1].lli = 0; /* end of link */
+ return vchan_tx_prep(&c->vc, &ds->vd, flags);
+}
+
+static struct dma_async_tx_descriptor *k3_dma_prep_slave_sg(
+ struct dma_chan *chan, struct scatterlist *sgl, unsigned int sglen,
+ enum dma_transfer_direction dir, unsigned long flags, void *context)
+{
+ struct k3_dma_chan *c = to_k3_chan(chan);
+ struct k3_dma_desc_sw *ds;
+ size_t len, avail, total = 0;
+ struct scatterlist *sg;
+ dma_addr_t addr, src = 0, dst = 0;
+ int num = sglen, i;
+
+ if (sgl == 0)
+ return NULL;
+
+ for_each_sg(sgl, sg, sglen, i) {
+ avail = sg_dma_len(sg);
+ if (avail > DMA_MAX_SIZE)
+ num += DIV_ROUND_UP(avail, DMA_MAX_SIZE) - 1;
+ }
+
+ ds = kzalloc(sizeof(*ds) + num * sizeof(ds->desc_hw[0]), GFP_ATOMIC);
+ if (!ds) {
+ dev_dbg(chan->device->dev, "vchan %p: kzalloc fail\n", &c->vc);
+ return NULL;
+ }
+ ds->desc_hw_lli = __virt_to_phys((unsigned long)&ds->desc_hw[0]);
+ ds->desc_num = num;
+ num = 0;
+
+ for_each_sg(sgl, sg, sglen, i) {
+ addr = sg_dma_address(sg);
+ avail = sg_dma_len(sg);
+ total += avail;
+
+ do {
+ len = min_t(size_t, avail, DMA_MAX_SIZE);
+
+ if (dir == DMA_MEM_TO_DEV) {
+ src = addr;
+ dst = c->dev_addr;
+ } else if (dir == DMA_DEV_TO_MEM) {
+ src = c->dev_addr;
+ dst = addr;
+ }
+
+ k3_dma_fill_desc(ds, dst, src, len, num++, c->ccfg);
+
+ addr += len;
+ avail -= len;
+ } while (avail);
+ }
+
+ ds->desc_hw[num-1].lli = 0; /* end of link */
+ ds->size = total;
+ return vchan_tx_prep(&c->vc, &ds->vd, flags);
+}
+
+static int k3_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
+ unsigned long arg)
+{
+ struct k3_dma_chan *c = to_k3_chan(chan);
+ struct k3_dma_dev *d = to_k3_dma(chan->device);
+ struct dma_slave_config *cfg = (void *)arg;
+ struct k3_dma_phy *p = c->phy;
+ unsigned long flags;
+ u32 maxburst = 0, val = 0;
+ enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
+ LIST_HEAD(head);
+
+ switch (cmd) {
+ case DMA_SLAVE_CONFIG:
+ if (cfg == NULL)
+ return -EINVAL;
+ c->dir = cfg->direction;
+ if (c->dir == DMA_DEV_TO_MEM) {
+ c->ccfg = CX_CFG_DSTINCR;
+ c->dev_addr = cfg->src_addr;
+ maxburst = cfg->src_maxburst;
+ width = cfg->src_addr_width;
+ } else if (c->dir == DMA_MEM_TO_DEV) {
+ c->ccfg = CX_CFG_SRCINCR;
+ c->dev_addr = cfg->dst_addr;
+ maxburst = cfg->dst_maxburst;
+ width = cfg->dst_addr_width;
+ }
+ switch (width) {
+ case DMA_SLAVE_BUSWIDTH_1_BYTE:
+ case DMA_SLAVE_BUSWIDTH_2_BYTES:
+ case DMA_SLAVE_BUSWIDTH_4_BYTES:
+ case DMA_SLAVE_BUSWIDTH_8_BYTES:
+ val = __ffs(width);
+ break;
+ default:
+ val = 3;
+ break;
+ }
+ c->ccfg |= (val << 12) | (val << 16);
+
+ if ((maxburst == 0) || (maxburst > 16))
+ val = 16;
+ else
+ val = maxburst - 1;
+ c->ccfg |= (val << 20) | (val << 24);
+ c->ccfg |= CX_CFG_MEM2PER | CX_CFG_EN;
+
+ /* specific request line */
+ c->ccfg |= c->vc.chan.chan_id << 4;
+ break;
+
+ case DMA_TERMINATE_ALL:
+ dev_dbg(d->slave.dev, "vchan %p: terminate all\n", &c->vc);
+
+ /* Prevent this channel being scheduled */
+ spin_lock(&d->lock);
+ list_del_init(&c->node);
+ spin_unlock(&d->lock);
+
+ /* Clear the tx descriptor lists */
+ spin_lock_irqsave(&c->vc.lock, flags);
+ vchan_get_all_descriptors(&c->vc, &head);
+ if (p) {
+ /* vchan is assigned to a pchan - stop the channel */
+ k3_dma_terminate_chan(p, d);
+ c->phy = NULL;
+ p->vchan = NULL;
+ p->ds_run = p->ds_done = NULL;
+ }
+ spin_unlock_irqrestore(&c->vc.lock, flags);
+ vchan_dma_desc_free_list(&c->vc, &head);
+ break;
+
+ case DMA_PAUSE:
+ dev_dbg(d->slave.dev, "vchan %p: pause\n", &c->vc);
+ if (c->status == DMA_IN_PROGRESS) {
+ c->status = DMA_PAUSED;
+ if (p) {
+ k3_dma_pause_dma(p, false);
+ } else {
+ spin_lock(&d->lock);
+ list_del_init(&c->node);
+ spin_unlock(&d->lock);
+ }
+ }
+ break;
+
+ case DMA_RESUME:
+ dev_dbg(d->slave.dev, "vchan %p: resume\n", &c->vc);
+ spin_lock_irqsave(&c->vc.lock, flags);
+ if (c->status == DMA_PAUSED) {
+ c->status = DMA_IN_PROGRESS;
+ if (p) {
+ k3_dma_pause_dma(p, true);
+ } else if (!list_empty(&c->vc.desc_issued)) {
+ spin_lock(&d->lock);
+ list_add_tail(&c->node, &d->chan_pending);
+ spin_unlock(&d->lock);
+ }
+ }
+ spin_unlock_irqrestore(&c->vc.lock, flags);
+ break;
+ default:
+ return -ENXIO;
+ }
+ return 0;
+}
+
+static void k3_dma_free_desc(struct virt_dma_desc *vd)
+{
+ struct k3_dma_desc_sw *ds =
+ container_of(vd, struct k3_dma_desc_sw, vd);
+
+ kfree(ds);
+}
+
+static struct of_device_id k3_pdma_dt_ids[] = {
+ { .compatible = "hisilicon,k3-dma-1.0", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, k3_pdma_dt_ids);
+
+static struct dma_chan *k3_of_dma_simple_xlate(struct of_phandle_args *dma_spec,
+ struct of_dma *ofdma)
+{
+ struct k3_dma_dev *d = ofdma->of_dma_data;
+ unsigned int request = dma_spec->args[0];
+
+ if (request > d->dma_requests)
+ return NULL;
+
+ return dma_get_slave_channel(&(d->chans[request].vc.chan));
+}
+
+static int k3_dma_probe(struct platform_device *op)
+{
+ struct k3_dma_dev *d;
+ const struct of_device_id *of_id;
+ struct resource *iores;
+ int i, ret, irq = 0;
+
+ iores = platform_get_resource(op, IORESOURCE_MEM, 0);
+ if (!iores)
+ return -EINVAL;
+
+ d = devm_kzalloc(&op->dev, sizeof(*d), GFP_KERNEL);
+ if (!d)
+ return -ENOMEM;
+
+ d->base = devm_request_and_ioremap(&op->dev, iores);
+ if (!d->base)
+ return -EADDRNOTAVAIL;
+
+ of_id = of_match_device(k3_pdma_dt_ids, &op->dev);
+ if (of_id) {
+ of_property_read_u32((&op->dev)->of_node,
+ "dma-channels", &d->dma_channels);
+ of_property_read_u32((&op->dev)->of_node,
+ "dma-requests", &d->dma_requests);
+ }
+
+ d->clk = devm_clk_get(&op->dev, NULL);
+ if (IS_ERR(d->clk)) {
+ dev_err(&op->dev, "no dma clk\n");
+ return PTR_ERR(d->clk);
+ }
+
+ irq = platform_get_irq(op, 0);
+ ret = devm_request_irq(&op->dev, irq,
+ k3_dma_int_handler, IRQF_DISABLED, DRIVER_NAME, d);
+ if (ret)
+ return ret;
+
+ /* init phy channel */
+ d->phy = devm_kzalloc(&op->dev,
+ d->dma_channels * sizeof(struct k3_dma_phy), GFP_KERNEL);
+ if (d->phy == NULL)
+ return -ENOMEM;
+
+ for (i = 0; i < d->dma_channels; i++) {
+ struct k3_dma_phy *p = &d->phy[i];
+
+ p->idx = i;
+ p->base = d->base + i * 0x40;
+ }
+
+ INIT_LIST_HEAD(&d->slave.channels);
+ dma_cap_set(DMA_SLAVE, d->slave.cap_mask);
+ dma_cap_set(DMA_MEMCPY, d->slave.cap_mask);
+ d->slave.dev = &op->dev;
+ d->slave.device_alloc_chan_resources = k3_dma_alloc_chan_resources;
+ d->slave.device_free_chan_resources = k3_dma_free_chan_resources;
+ d->slave.device_tx_status = k3_dma_tx_status;
+ d->slave.device_prep_dma_memcpy = k3_dma_prep_memcpy;
+ d->slave.device_prep_slave_sg = k3_dma_prep_slave_sg;
+ d->slave.device_issue_pending = k3_dma_issue_pending;
+ d->slave.device_control = k3_dma_control;
+ d->slave.copy_align = DMA_ALIGN;
+ d->slave.chancnt = d->dma_requests;
+
+ /* init virtual channel */
+ d->chans = devm_kzalloc(&op->dev,
+ d->dma_requests * sizeof(struct k3_dma_chan), GFP_KERNEL);
+ if (d->chans == NULL)
+ return -ENOMEM;
+
+ for (i = 0; i < d->dma_requests; i++) {
+ struct k3_dma_chan *c = &d->chans[i];
+
+ c->status = DMA_IN_PROGRESS;
+ INIT_LIST_HEAD(&c->node);
+ c->vc.desc_free = k3_dma_free_desc;
+ vchan_init(&c->vc, &d->slave);
+ }
+
+ /* Enable clock before accessing registers */
+ ret = clk_prepare_enable(d->clk);
+ if (ret < 0) {
+ dev_err(&op->dev, "clk_prepare_enable failed: %d\n", ret);
+ return ret;
+ }
+
+ k3_dma_enable_dma(d, true);
+
+ ret = dma_async_device_register(&d->slave);
+ if (ret)
+ return ret;
+
+ ret = of_dma_controller_register((&op->dev)->of_node,
+ k3_of_dma_simple_xlate, d);
+ if (ret)
+ goto of_dma_register_fail;
+
+ spin_lock_init(&d->lock);
+ INIT_LIST_HEAD(&d->chan_pending);
+ tasklet_init(&d->task, k3_dma_tasklet, (unsigned long)d);
+ platform_set_drvdata(op, d);
+ dev_info(&op->dev, "initialized\n");
+
+ return 0;
+
+of_dma_register_fail:
+ dma_async_device_unregister(&d->slave);
+ return ret;
+}
+
+static int k3_dma_remove(struct platform_device *op)
+{
+ struct k3_dma_chan *c, *cn;
+ struct k3_dma_dev *d = platform_get_drvdata(op);
+
+ dma_async_device_unregister(&d->slave);
+ of_dma_controller_free((&op->dev)->of_node);
+
+ list_for_each_entry_safe(c, cn, &d->slave.channels, vc.chan.device_node) {
+ list_del(&c->vc.chan.device_node);
+ tasklet_kill(&c->vc.task);
+ }
+ tasklet_kill(&d->task);
+ clk_disable_unprepare(d->clk);
+ return 0;
+}
+
+static int k3_dma_suspend(struct device *dev)
+{
+ struct k3_dma_dev *d = dev_get_drvdata(dev);
+ u32 stat = 0;
+
+ stat = k3_dma_get_chan_stat(d);
+ if (stat) {
+ dev_warn(d->slave.dev,
+ "chan %d is running fail to suspend\n", stat);
+ return -1;
+ }
+ k3_dma_enable_dma(d, false);
+ clk_disable_unprepare(d->clk);
+ return 0;
+}
+
+static int k3_dma_resume(struct device *dev)
+{
+ struct k3_dma_dev *d = dev_get_drvdata(dev);
+ int ret = 0;
+
+ ret = clk_prepare_enable(d->clk);
+ if (ret < 0) {
+ dev_err(d->slave.dev, "clk_prepare_enable failed: %d\n", ret);
+ return ret;
+ }
+ k3_dma_enable_dma(d, true);
+ return 0;
+}
+
+SIMPLE_DEV_PM_OPS(k3_dma_pmops, k3_dma_suspend, k3_dma_resume);
+
+static struct platform_driver k3_pdma_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .pm = &k3_dma_pmops,
+ .of_match_table = k3_pdma_dt_ids,
+ },
+ .probe = k3_dma_probe,
+ .remove = k3_dma_remove,
+};
+
+module_platform_driver(k3_pdma_driver);
+
+MODULE_DESCRIPTION("Hisilicon k3 DMA Driver");
+MODULE_ALIAS("platform:k3dma");
+MODULE_LICENSE("GPL v2");