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Message-ID: <CAGp9LzqkOHPqVmAOR+YRotOb511BEDOpUWHc-YSjphF3Gpar=w@mail.gmail.com>
Date: Wed, 5 Dec 2018 13:07:11 -0800
From: Sean Wang <sean.wang@...nel.org>
To: long.cheng@...iatek.com
Cc: vkoul@...nel.org, robh+dt@...nel.org, mark.rutland@....com,
devicetree@...r.kernel.org, srv_heupstream@...iatek.com,
gregkh@...uxfoundation.org,
Sean Wang (王志亘) <sean.wang@...iatek.com>,
linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
linux-mediatek@...ts.infradead.org, linux-serial@...r.kernel.org,
jslaby@...e.com, Matthias Brugger <matthias.bgg@...il.com>,
yingjoe.chen@...iatek.com, dan.j.williams@...el.com,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/4] dmaengine: mtk_uart_dma: add Mediatek uart DMA support
.
On Wed, Dec 5, 2018 at 1:31 AM Long Cheng <long.cheng@...iatek.com> wrote:
>
> In DMA engine framework, add 8250 mtk dma to support it.
>
> Signed-off-by: Long Cheng <long.cheng@...iatek.com>
> ---
> drivers/dma/mediatek/8250_mtk_dma.c | 894 +++++++++++++++++++++++++++++++++++
> drivers/dma/mediatek/Kconfig | 11 +
> drivers/dma/mediatek/Makefile | 1 +
> 3 files changed, 906 insertions(+)
> create mode 100644 drivers/dma/mediatek/8250_mtk_dma.c
>
> diff --git a/drivers/dma/mediatek/8250_mtk_dma.c b/drivers/dma/mediatek/8250_mtk_dma.c
> new file mode 100644
> index 0000000..3454679
> --- /dev/null
> +++ b/drivers/dma/mediatek/8250_mtk_dma.c
> @@ -0,0 +1,894 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Mediatek 8250 DMA driver.
> + *
> + * Copyright (c) 2018 MediaTek Inc.
> + * Author: Long Cheng <long.cheng@...iatek.com>
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/dmaengine.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/err.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/list.h>
> +#include <linux/module.h>
> +#include <linux/of_dma.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/spinlock.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/iopoll.h>
> +
> +#include "../virt-dma.h"
> +
> +#define MTK_APDMA_DEFAULT_REQUESTS 127
> +#define MTK_APDMA_CHANNELS (CONFIG_SERIAL_8250_NR_UARTS * 2)
> +
> +#define VFF_EN_B BIT(0)
> +#define VFF_STOP_B BIT(0)
> +#define VFF_FLUSH_B BIT(0)
> +#define VFF_4G_SUPPORT_B BIT(0)
> +#define VFF_RX_INT_EN0_B BIT(0) /*rx valid size >= vff thre*/
> +#define VFF_RX_INT_EN1_B BIT(1)
> +#define VFF_TX_INT_EN_B BIT(0) /*tx left size >= vff thre*/
> +#define VFF_WARM_RST_B BIT(0)
> +#define VFF_RX_INT_FLAG_CLR_B (BIT(0) | BIT(1))
> +#define VFF_TX_INT_FLAG_CLR_B 0
> +#define VFF_STOP_CLR_B 0
> +#define VFF_FLUSH_CLR_B 0
> +#define VFF_INT_EN_CLR_B 0
> +#define VFF_4G_SUPPORT_CLR_B 0
> +
> +/* interrupt trigger level for tx */
> +#define VFF_TX_THRE(n) ((n) * 7 / 8)
> +/* interrupt trigger level for rx */
> +#define VFF_RX_THRE(n) ((n) * 3 / 4)
> +
> +#define MTK_DMA_RING_SIZE 0xffffU
> +/* invert this bit when wrap ring head again*/
> +#define MTK_DMA_RING_WRAP 0x10000U
> +
> +#define VFF_INT_FLAG 0x00
> +#define VFF_INT_EN 0x04
> +#define VFF_EN 0x08
> +#define VFF_RST 0x0c
> +#define VFF_STOP 0x10
> +#define VFF_FLUSH 0x14
> +#define VFF_ADDR 0x1c
> +#define VFF_LEN 0x24
> +#define VFF_THRE 0x28
> +#define VFF_WPT 0x2c
> +#define VFF_RPT 0x30
> +/*TX: the buffer size HW can read. RX: the buffer size SW can read.*/
> +#define VFF_VALID_SIZE 0x3c
> +/*TX: the buffer size SW can write. RX: the buffer size HW can write.*/
> +#define VFF_LEFT_SIZE 0x40
> +#define VFF_DEBUG_STATUS 0x50
> +#define VFF_4G_SUPPORT 0x54
> +
> +struct mtk_dmadev {
> + struct dma_device ddev;
> + void __iomem *mem_base[MTK_APDMA_CHANNELS];
> + spinlock_t lock; /* dma dev lock */
> + struct tasklet_struct task;
> + struct list_head pending;
> + struct clk *clk;
> + unsigned int dma_requests;
> + bool support_33bits;
> + unsigned int dma_irq[MTK_APDMA_CHANNELS];
> + struct mtk_chan *ch[MTK_APDMA_CHANNELS];
> +};
> +
> +struct mtk_chan {
> + struct virt_dma_chan vc;
> + struct list_head node;
> + struct dma_slave_config cfg;
> + void __iomem *base;
> + struct mtk_dma_desc *desc;
> +
> + bool stop;
> + bool requested;
> +
> + unsigned int dma_sig;
the member can be removed as no real user would refer to it
> + unsigned int dma_ch;
a chan_id is already included in struct dma_chan, we can reuse it
> + unsigned int sgidx;
the member also can be removed as no real user would refer to it
> + unsigned int remain_size;
The member remain_size seems unnecessary data to maintain a channel.
The virtual channel struct virt_dma_chan already provide the way to
manage all descriptors you're operating on, you should reuse related
functions to virt_dma_chan first.
Or if you mean remain_size is about the remaining size of current
descriptor, and then putting into struct mtk_dma_desc would be better.
> + unsigned int rx_ptr;
> +};
> +
> +struct mtk_dma_sg {
> + dma_addr_t addr;
> + unsigned int en; /* number of elements (24-bit) */
> + unsigned int fn; /* number of frames (16-bit) */
> +};
> +
> +struct mtk_dma_desc {
> + struct virt_dma_desc vd;
> + enum dma_transfer_direction dir;
> +
> + unsigned int sglen;
> + struct mtk_dma_sg sg[0];
> +};
> +
> +static bool mtk_dma_filter_fn(struct dma_chan *chan, void *param);
> +static struct of_dma_filter_info mtk_dma_info = {
> + .filter_fn = mtk_dma_filter_fn,
> +};
> +
> +static inline struct mtk_dmadev *to_mtk_dma_dev(struct dma_device *d)
> +{
> + return container_of(d, struct mtk_dmadev, ddev);
> +}
> +
> +static inline struct mtk_chan *to_mtk_dma_chan(struct dma_chan *c)
> +{
> + return container_of(c, struct mtk_chan, vc.chan);
> +}
> +
> +static inline struct mtk_dma_desc *to_mtk_dma_desc
> + (struct dma_async_tx_descriptor *t)
> +{
> + return container_of(t, struct mtk_dma_desc, vd.tx);
> +}
> +
> +static void mtk_dma_chan_write(struct mtk_chan *c,
> + unsigned int reg, unsigned int val)
> +{
> + writel(val, c->base + reg);
> +}
> +
> +static unsigned int mtk_dma_chan_read(struct mtk_chan *c, unsigned int reg)
> +{
> + return readl(c->base + reg);
> +}
> +
> +static void mtk_dma_desc_free(struct virt_dma_desc *vd)
> +{
> + struct dma_chan *chan = vd->tx.chan;
> + struct mtk_chan *c = to_mtk_dma_chan(chan);
> +
> + kfree(c->desc);
> + c->desc = NULL;
> +}
> +
> +static int mtk_dma_clk_enable(struct mtk_dmadev *mtkd)
> +{
> + int ret;
> +
> + ret = clk_prepare_enable(mtkd->clk);
> + if (ret) {
> + dev_err(mtkd->ddev.dev, "Couldn't enable the clock\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static void mtk_dma_clk_disable(struct mtk_dmadev *mtkd)
> +{
> + clk_disable_unprepare(mtkd->clk);
> +}
> +
> +static void mtk_dma_remove_virt_list(dma_cookie_t cookie,
> + struct virt_dma_chan *vc)
> +{
> + struct virt_dma_desc *vd;
> +
> + if (list_empty(&vc->desc_issued) == 0) {
> + list_for_each_entry(vd, &vc->desc_issued, node) {
> + if (cookie == vd->tx.cookie) {
> + INIT_LIST_HEAD(&vc->desc_issued);
generally, we don't force initialze the list desc_issued. Instead,
when each descriptor is completed, we need to move each descriptor
from the list desc_issued to the list desc_completed.
> + break;
> + }
> + }
> + }
> +}
> +
> +static void mtk_dma_tx_flush(struct dma_chan *chan)
> +{
> + struct mtk_chan *c = to_mtk_dma_chan(chan);
> +
> + if (mtk_dma_chan_read(c, VFF_FLUSH) == 0U)
> + mtk_dma_chan_write(c, VFF_FLUSH, VFF_FLUSH_B);
> +}
> +
> +static void mtk_dma_tx_write(struct dma_chan *chan)
> +{
> + struct mtk_chan *c = to_mtk_dma_chan(chan);
> + unsigned int txcount = c->remain_size;
> + unsigned int len, send, left, wpt, wrap;
> +
> + len = mtk_dma_chan_read(c, VFF_LEN);
> +
> + while ((left = mtk_dma_chan_read(c, VFF_LEFT_SIZE)) > 0U) {
> + if (c->remain_size == 0U)
> + break;
> + send = min(left, c->remain_size);
min_t
> + wpt = mtk_dma_chan_read(c, VFF_WPT);
> + wrap = wpt & MTK_DMA_RING_WRAP ? 0U : MTK_DMA_RING_WRAP;
> +
> + if ((wpt & (len - 1U)) + send < len)
> + mtk_dma_chan_write(c, VFF_WPT, wpt + send);
> + else
> + mtk_dma_chan_write(c, VFF_WPT,
> + ((wpt + send) & (len - 1U))
> + | wrap);
> +
> + c->remain_size -= send;
I'm curious why you don't need to set up the hardware from the
descriptor information
> + }
> +
> + if (txcount != c->remain_size) {
> + mtk_dma_chan_write(c, VFF_INT_EN, VFF_TX_INT_EN_B);
> + mtk_dma_tx_flush(chan);
> + }
> +}
> +
> +static void mtk_dma_start_tx(struct mtk_chan *c)
> +{
> + if (mtk_dma_chan_read(c, VFF_LEFT_SIZE) == 0U)
> + mtk_dma_chan_write(c, VFF_INT_EN, VFF_TX_INT_EN_B);
> + else
> + mtk_dma_tx_write(&c->vc.chan);
> +
> + c->stop = false;
> +}
> +
> +static void mtk_dma_get_rx_size(struct mtk_chan *c)
> +{
> + unsigned int rx_size = mtk_dma_chan_read(c, VFF_LEN);
> + unsigned int rdptr, wrptr, wrreg, rdreg, count;
> +
> + rdreg = mtk_dma_chan_read(c, VFF_RPT);
> + wrreg = mtk_dma_chan_read(c, VFF_WPT);
> + rdptr = rdreg & MTK_DMA_RING_SIZE;
> + wrptr = wrreg & MTK_DMA_RING_SIZE;
> + count = ((rdreg ^ wrreg) & MTK_DMA_RING_WRAP) ?
> + (wrptr + rx_size - rdptr) : (wrptr - rdptr);
> +
> + c->remain_size = count;
> + c->rx_ptr = rdptr;
> +
> + mtk_dma_chan_write(c, VFF_RPT, wrreg);
> +}
> +
> +static void mtk_dma_start_rx(struct mtk_chan *c)
> +{
> + struct dma_chan *chan = &c->vc.chan;
> + struct mtk_dmadev *mtkd = to_mtk_dma_dev(chan->device);
> + struct mtk_dma_desc *d = c->desc;
> +
> + if (mtk_dma_chan_read(c, VFF_VALID_SIZE) == 0U)
> + return;
> +
> + if (d && d->vd.tx.cookie != 0) {
the driver benefits from virtual_channel so you can manage the life
cycle of each descriptor by the virtual channel related functions
without handling details about the cookie.
> + mtk_dma_get_rx_size(c);
> + mtk_dma_remove_virt_list(d->vd.tx.cookie, &c->vc);
> + vchan_cookie_complete(&d->vd);
> + } else {
> + spin_lock(&mtkd->lock);
> + if (list_empty(&mtkd->pending))
> + list_add_tail(&c->node, &mtkd->pending);
> + spin_unlock(&mtkd->lock);
> + tasklet_schedule(&mtkd->task);
> + }
> +}
> +
> +static void mtk_dma_reset(struct mtk_chan *c)
> +{
> + struct mtk_dmadev *mtkd = to_mtk_dma_dev(c->vc.chan.device);
> + u32 status;
> + int ret;
> +
> + mtk_dma_chan_write(c, VFF_ADDR, 0);
> + mtk_dma_chan_write(c, VFF_THRE, 0);
> + mtk_dma_chan_write(c, VFF_LEN, 0);
> + mtk_dma_chan_write(c, VFF_RST, VFF_WARM_RST_B);
> +
> + ret = readx_poll_timeout(readl,
> + c->base + VFF_EN,
> + status, status == 0, 10, 100);
> + if (ret) {
> + dev_err(c->vc.chan.device->dev,
> + "dma reset: fail, timeout\n");
> + return;
> + }
> +
> + if (c->cfg.direction == DMA_DEV_TO_MEM)
> + mtk_dma_chan_write(c, VFF_RPT, 0);
> + else if (c->cfg.direction == DMA_MEM_TO_DEV)
> + mtk_dma_chan_write(c, VFF_WPT, 0);
> +
> + if (mtkd->support_33bits)
> + mtk_dma_chan_write(c, VFF_4G_SUPPORT, VFF_4G_SUPPORT_CLR_B);
> +}
> +
> +static void mtk_dma_stop(struct mtk_chan *c)
> +{
> + u32 status;
> + int ret;
> +
> + mtk_dma_chan_write(c, VFF_FLUSH, VFF_FLUSH_CLR_B);
> + /* Wait for flush */
> + ret = readx_poll_timeout(readl,
> + c->base + VFF_FLUSH,
> + status,
> + (status & VFF_FLUSH_B) != VFF_FLUSH_B,
> + 10, 100);
> + if (ret)
> + dev_err(c->vc.chan.device->dev,
> + "dma stop: polling FLUSH fail, DEBUG=0x%x\n",
> + mtk_dma_chan_read(c, VFF_DEBUG_STATUS));
> +
> + /*set stop as 1 -> wait until en is 0 -> set stop as 0*/
> + mtk_dma_chan_write(c, VFF_STOP, VFF_STOP_B);
> + ret = readx_poll_timeout(readl,
> + c->base + VFF_EN,
> + status, status == 0, 10, 100);
> + if (ret)
> + dev_err(c->vc.chan.device->dev,
> + "dma stop: polling VFF_EN fail, DEBUG=0x%x\n",
> + mtk_dma_chan_read(c, VFF_DEBUG_STATUS));
> +
> + mtk_dma_chan_write(c, VFF_STOP, VFF_STOP_CLR_B);
> + mtk_dma_chan_write(c, VFF_INT_EN, VFF_INT_EN_CLR_B);
> +
> + if (c->cfg.direction == DMA_DEV_TO_MEM)
> + mtk_dma_chan_write(c, VFF_INT_FLAG, VFF_RX_INT_FLAG_CLR_B);
> + else
> + mtk_dma_chan_write(c, VFF_INT_FLAG, VFF_TX_INT_FLAG_CLR_B);
> +
> + c->stop = true;
> +}
> +
> +/*
> + * This callback schedules all pending channels. We could be more
> + * clever here by postponing allocation of the real DMA channels to
> + * this point, and freeing them when our virtual channel becomes idle.
> + *
> + * We would then need to deal with 'all channels in-use'
> + */
> +static void mtk_dma_sched(unsigned long data)
> +{
> + struct mtk_dmadev *mtkd = (struct mtk_dmadev *)data;
> + struct virt_dma_desc *vd;
> + struct mtk_chan *c;
> + dma_cookie_t cookie;
> + unsigned long flags;
> + LIST_HEAD(head);
> +
> + spin_lock_irq(&mtkd->lock);
> + list_splice_tail_init(&mtkd->pending, &head);
> + spin_unlock_irq(&mtkd->lock);
> +
> + if (!list_empty(&head)) {
> + c = list_first_entry(&head, struct mtk_chan, node);
> + cookie = c->vc.chan.cookie;
> +
> + spin_lock_irqsave(&c->vc.lock, flags);
> + if (c->cfg.direction == DMA_DEV_TO_MEM) {
> + list_del_init(&c->node);
> + mtk_dma_start_rx(c);
> + } else if (c->cfg.direction == DMA_MEM_TO_DEV) {
> + vd = vchan_find_desc(&c->vc, cookie);
> + c->desc = to_mtk_dma_desc(&vd->tx);
> + list_del_init(&c->node);
> + mtk_dma_start_tx(c);
> + }
> + spin_unlock_irqrestore(&c->vc.lock, flags);
> + }
> +}
> +
> +static int mtk_dma_alloc_chan_resources(struct dma_chan *chan)
> +{
> + struct mtk_dmadev *mtkd = to_mtk_dma_dev(chan->device);
> + struct mtk_chan *c = to_mtk_dma_chan(chan);
> + int ret = -EBUSY;
> +
> + pm_runtime_get_sync(mtkd->ddev.dev);
> +
> + if (!mtkd->ch[c->dma_ch]) {
> + c->base = mtkd->mem_base[c->dma_ch];
> + mtkd->ch[c->dma_ch] = c;
> + ret = 1;
> + }
> + c->requested = false;
> + mtk_dma_reset(c);
> +
> + return ret;
> +}
> +
> +static void mtk_dma_free_chan_resources(struct dma_chan *chan)
> +{
> + struct mtk_dmadev *mtkd = to_mtk_dma_dev(chan->device);
> + struct mtk_chan *c = to_mtk_dma_chan(chan);
> +
> + if (c->requested) {
> + c->requested = false;
> + free_irq(mtkd->dma_irq[c->dma_ch], chan);
> + }
> +
> + tasklet_kill(&mtkd->task);
> + tasklet_kill(&c->vc.task);
> +
> + c->base = NULL;
> + mtkd->ch[c->dma_ch] = NULL;
> + vchan_free_chan_resources(&c->vc);
> +
> + dev_dbg(mtkd->ddev.dev, "freeing channel for %u\n", c->dma_sig);
> + c->dma_sig = 0;
> +
> + pm_runtime_put_sync(mtkd->ddev.dev);
> +}
> +
> +static enum dma_status mtk_dma_tx_status(struct dma_chan *chan,
> + dma_cookie_t cookie,
> + struct dma_tx_state *txstate)
> +{
> + struct mtk_chan *c = to_mtk_dma_chan(chan);
> + enum dma_status ret;
> + unsigned long flags;
> +
> + if (!txstate)
> + return DMA_ERROR;
> +
> + ret = dma_cookie_status(chan, cookie, txstate);
> + spin_lock_irqsave(&c->vc.lock, flags);
> + if (ret == DMA_IN_PROGRESS) {
> + c->rx_ptr = mtk_dma_chan_read(c, VFF_RPT) & MTK_DMA_RING_SIZE;
> + dma_set_residue(txstate, c->rx_ptr);
> + } else if (ret == DMA_COMPLETE && c->cfg.direction == DMA_DEV_TO_MEM) {
> + dma_set_residue(txstate, c->remain_size);
> + } else {
> + dma_set_residue(txstate, 0);
> + }
> + spin_unlock_irqrestore(&c->vc.lock, flags);
> +
> + return ret;
> +}
> +
> +static struct dma_async_tx_descriptor *mtk_dma_prep_slave_sg
> + (struct dma_chan *chan, struct scatterlist *sgl,
> + unsigned int sglen, enum dma_transfer_direction dir,
> + unsigned long tx_flags, void *context)
> +{
> + struct mtk_chan *c = to_mtk_dma_chan(chan);
> + struct scatterlist *sgent;
> + struct mtk_dma_desc *d;
> + struct mtk_dma_sg *sg;
> + unsigned int size, i, j, en;
> +
> + en = 1;
> +
> + if ((dir != DMA_DEV_TO_MEM) &&
> + (dir != DMA_MEM_TO_DEV)) {
> + dev_err(chan->device->dev, "bad direction\n");
> + return NULL;
> + }
> +
> + /* Now allocate and setup the descriptor. */
> + d = kzalloc(sizeof(*d) + sglen * sizeof(d->sg[0]), GFP_ATOMIC);
> + if (!d)
> + return NULL;
> +
> + d->dir = dir;
> +
> + j = 0;
> + for_each_sg(sgl, sgent, sglen, i) {
> + d->sg[j].addr = sg_dma_address(sgent);
> + d->sg[j].en = en;
> + d->sg[j].fn = sg_dma_len(sgent) / en;
> + j++;
> + }
> +
> + d->sglen = j;
> +
> + if (dir == DMA_MEM_TO_DEV) {
> + for (size = i = 0; i < d->sglen; i++) {
> + sg = &d->sg[i];
> + size += sg->en * sg->fn;
> + }
> + c->remain_size = size;
> + }
> +
> + return vchan_tx_prep(&c->vc, &d->vd, tx_flags);
> +}
> +
> +static void mtk_dma_issue_pending(struct dma_chan *chan)
> +{
> + struct mtk_chan *c = to_mtk_dma_chan(chan);
> + struct virt_dma_desc *vd;
> + struct mtk_dmadev *mtkd;
> + dma_cookie_t cookie;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&c->vc.lock, flags);
> + if (c->cfg.direction == DMA_DEV_TO_MEM) {
> + cookie = c->vc.chan.cookie;
> + mtkd = to_mtk_dma_dev(chan->device);
> + if (vchan_issue_pending(&c->vc) && !c->desc) {
vchan_issue_pending means putting all the descriptors to list
desc_issued, I'm supposed somewhere would iterate the list by
vchan_next_desc and program each desc. into hardware. but I don't see
the similar code.
> + vd = vchan_find_desc(&c->vc, cookie);
> + c->desc = to_mtk_dma_desc(&vd->tx);
> + }
> + } else if (c->cfg.direction == DMA_MEM_TO_DEV) {
> + cookie = c->vc.chan.cookie;
> + if (vchan_issue_pending(&c->vc) && !c->desc) {
ditto as the above
> + vd = vchan_find_desc(&c->vc, cookie);
> + c->desc = to_mtk_dma_desc(&vd->tx);
> + mtk_dma_start_tx(c);
> + }
> + }
> + spin_unlock_irqrestore(&c->vc.lock, flags);
> +}
> +
> +static irqreturn_t mtk_dma_rx_interrupt(int irq, void *dev_id)
> +{
> + struct dma_chan *chan = (struct dma_chan *)dev_id;
> + struct mtk_chan *c = to_mtk_dma_chan(chan);
> + unsigned long flags;
> +
> + spin_lock_irqsave(&c->vc.lock, flags);
> + mtk_dma_chan_write(c, VFF_INT_FLAG, VFF_RX_INT_FLAG_CLR_B);
> +
> + mtk_dma_start_rx(c);
> +
> + spin_unlock_irqrestore(&c->vc.lock, flags);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static irqreturn_t mtk_dma_tx_interrupt(int irq, void *dev_id)
> +{
> + struct dma_chan *chan = (struct dma_chan *)dev_id;
> + struct mtk_dmadev *mtkd = to_mtk_dma_dev(chan->device);
> + struct mtk_chan *c = to_mtk_dma_chan(chan);
> + struct mtk_dma_desc *d = c->desc;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&c->vc.lock, flags);
> + if (c->remain_size != 0U) {
> + list_add_tail(&c->node, &mtkd->pending);
> + tasklet_schedule(&mtkd->task);
> + } else {
> + mtk_dma_remove_virt_list(d->vd.tx.cookie, &c->vc);
> + vchan_cookie_complete(&d->vd);
> + }
> + spin_unlock_irqrestore(&c->vc.lock, flags);
> +
> + mtk_dma_chan_write(c, VFF_INT_FLAG, VFF_TX_INT_FLAG_CLR_B);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int mtk_dma_slave_config(struct dma_chan *chan,
> + struct dma_slave_config *cfg)
> +{
> + struct mtk_chan *c = to_mtk_dma_chan(chan);
> + struct mtk_dmadev *mtkd = to_mtk_dma_dev(c->vc.chan.device);
> + int ret;
> +
> + c->cfg = *cfg;
> +
> + if (cfg->direction == DMA_DEV_TO_MEM) {
> + unsigned int rx_len = cfg->src_addr_width * 1024;
> +
> + mtk_dma_chan_write(c, VFF_ADDR, cfg->src_addr);
> + mtk_dma_chan_write(c, VFF_LEN, rx_len);
> + mtk_dma_chan_write(c, VFF_THRE, VFF_RX_THRE(rx_len));
> + mtk_dma_chan_write(c,
> + VFF_INT_EN, VFF_RX_INT_EN0_B
> + | VFF_RX_INT_EN1_B);
> + mtk_dma_chan_write(c, VFF_INT_FLAG, VFF_RX_INT_FLAG_CLR_B);
> + mtk_dma_chan_write(c, VFF_EN, VFF_EN_B);
> +
> + if (!c->requested) {
> + c->requested = true;
> + ret = request_irq(mtkd->dma_irq[c->dma_ch],
> + mtk_dma_rx_interrupt,
> + IRQF_TRIGGER_NONE,
> + KBUILD_MODNAME, chan);
> + if (ret < 0) {
> + dev_err(chan->device->dev, "Can't request rx dma IRQ\n");
> + return -EINVAL;
> + }
> + }
> + } else if (cfg->direction == DMA_MEM_TO_DEV) {
> + unsigned int tx_len = cfg->dst_addr_width * 1024;
> +
> + mtk_dma_chan_write(c, VFF_ADDR, cfg->dst_addr);
> + mtk_dma_chan_write(c, VFF_LEN, tx_len);
> + mtk_dma_chan_write(c, VFF_THRE, VFF_TX_THRE(tx_len));
> + mtk_dma_chan_write(c, VFF_INT_FLAG, VFF_TX_INT_FLAG_CLR_B);
> + mtk_dma_chan_write(c, VFF_EN, VFF_EN_B);
> +
> + if (!c->requested) {
> + c->requested = true;
> + ret = request_irq(mtkd->dma_irq[c->dma_ch],
> + mtk_dma_tx_interrupt,
> + IRQF_TRIGGER_NONE,
> + KBUILD_MODNAME, chan);
> + if (ret < 0) {
> + dev_err(chan->device->dev, "Can't request tx dma IRQ\n");
> + return -EINVAL;
> + }
> + }
> + }
> +
> + if (mtkd->support_33bits)
> + mtk_dma_chan_write(c, VFF_4G_SUPPORT, VFF_4G_SUPPORT_B);
> +
> + if (mtk_dma_chan_read(c, VFF_EN) != VFF_EN_B) {
> + dev_err(chan->device->dev,
> + "config dma dir[%d] fail\n", cfg->direction);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int mtk_dma_terminate_all(struct dma_chan *chan)
> +{
> + struct mtk_chan *c = to_mtk_dma_chan(chan);
> + unsigned long flags;
> +
> + spin_lock_irqsave(&c->vc.lock, flags);
> + list_del_init(&c->node);
> + mtk_dma_stop(c);
> + spin_unlock_irqrestore(&c->vc.lock, flags);
> +
> + return 0;
> +}
> +
> +static int mtk_dma_device_pause(struct dma_chan *chan)
> +{
> + /* just for check caps pass */
> + return -EINVAL;
> +}
it it possible not to register the function to the core if the
hardware doesn't support it?
> +
> +static int mtk_dma_device_resume(struct dma_chan *chan)
> +{
> + /* just for check caps pass */
> + return -EINVAL;
> +}
ditto as the above
> +
> +static void mtk_dma_free(struct mtk_dmadev *mtkd)
> +{
> + tasklet_kill(&mtkd->task);
> + while (list_empty(&mtkd->ddev.channels) == 0) {
> + struct mtk_chan *c = list_first_entry(&mtkd->ddev.channels,
> + struct mtk_chan, vc.chan.device_node);
> +
> + list_del(&c->vc.chan.device_node);
> + tasklet_kill(&c->vc.task);
> + devm_kfree(mtkd->ddev.dev, c);
> + }
> +}
> +
> +static const struct of_device_id mtk_uart_dma_match[] = {
> + { .compatible = "mediatek,mt6577-uart-dma", },
> + { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, mtk_uart_dma_match);
> +
> +static int mtk_apdma_probe(struct platform_device *pdev)
> +{
> + struct mtk_dmadev *mtkd;
> + struct resource *res;
> + struct mtk_chan *c;
> + unsigned int i;
> + int rc;
> +
> + mtkd = devm_kzalloc(&pdev->dev, sizeof(*mtkd), GFP_KERNEL);
> + if (!mtkd)
> + return -ENOMEM;
> +
> + for (i = 0; i < MTK_APDMA_CHANNELS; i++) {
> + res = platform_get_resource(pdev, IORESOURCE_MEM, i);
> + if (!res)
> + return -ENODEV;
> + mtkd->mem_base[i] = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(mtkd->mem_base[i]))
> + return PTR_ERR(mtkd->mem_base[i]);
> + }
> +
> + for (i = 0; i < MTK_APDMA_CHANNELS; i++) {
> + mtkd->dma_irq[i] = platform_get_irq(pdev, i);
> + if ((int)mtkd->dma_irq[i] < 0) {
> + dev_err(&pdev->dev, "failed to get IRQ[%d]\n", i);
> + return -EINVAL;
> + }
> + }
> +
> + mtkd->clk = devm_clk_get(&pdev->dev, NULL);
> + if (IS_ERR(mtkd->clk)) {
> + dev_err(&pdev->dev, "No clock specified\n");
> + return PTR_ERR(mtkd->clk);
> + }
> +
> + if (of_property_read_bool(pdev->dev.of_node, "dma-33bits")) {
> + dev_info(&pdev->dev, "Support dma 33bits\n");
> + mtkd->support_33bits = true;
> + }
> +
> + if (mtkd->support_33bits)
> + rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(33));
> + else
> + rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
> + if (rc)
> + return rc;
> +
> + dma_cap_set(DMA_SLAVE, mtkd->ddev.cap_mask);
> + mtkd->ddev.device_alloc_chan_resources = mtk_dma_alloc_chan_resources;
> + mtkd->ddev.device_free_chan_resources = mtk_dma_free_chan_resources;
> + mtkd->ddev.device_tx_status = mtk_dma_tx_status;
> + mtkd->ddev.device_issue_pending = mtk_dma_issue_pending;
> + mtkd->ddev.device_prep_slave_sg = mtk_dma_prep_slave_sg;
> + mtkd->ddev.device_config = mtk_dma_slave_config;
> + mtkd->ddev.device_pause = mtk_dma_device_pause;
> + mtkd->ddev.device_resume = mtk_dma_device_resume;
> + mtkd->ddev.device_terminate_all = mtk_dma_terminate_all;
> + mtkd->ddev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE);
> + mtkd->ddev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE);
> + mtkd->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
> + mtkd->ddev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
> + mtkd->ddev.dev = &pdev->dev;
> + INIT_LIST_HEAD(&mtkd->ddev.channels);
> + INIT_LIST_HEAD(&mtkd->pending);
> +
> + spin_lock_init(&mtkd->lock);
> + tasklet_init(&mtkd->task, mtk_dma_sched, (unsigned long)mtkd);
> +
> + mtkd->dma_requests = MTK_APDMA_DEFAULT_REQUESTS;
> + if (of_property_read_u32(pdev->dev.of_node,
> + "dma-requests", &mtkd->dma_requests)) {
> + dev_info(&pdev->dev,
> + "Missing dma-requests property, using %u.\n",
> + MTK_APDMA_DEFAULT_REQUESTS);
> + }
> +
> + for (i = 0; i < MTK_APDMA_CHANNELS; i++) {
> + c = devm_kzalloc(mtkd->ddev.dev, sizeof(*c), GFP_KERNEL);
> + if (!c)
> + goto err_no_dma;
> +
> + c->vc.desc_free = mtk_dma_desc_free;
> + vchan_init(&c->vc, &mtkd->ddev);
> + INIT_LIST_HEAD(&c->node);
> + }
> +
> + pm_runtime_enable(&pdev->dev);
> + pm_runtime_set_active(&pdev->dev);
> +
> + rc = dma_async_device_register(&mtkd->ddev);
> + if (rc)
> + goto rpm_disable;
> +
> + platform_set_drvdata(pdev, mtkd);
> +
> + if (pdev->dev.of_node) {
> + mtk_dma_info.dma_cap = mtkd->ddev.cap_mask;
> +
> + /* Device-tree DMA controller registration */
> + rc = of_dma_controller_register(pdev->dev.of_node,
> + of_dma_simple_xlate,
> + &mtk_dma_info);
reusing of_dma_xlate_by_chan_id seem that also work for you.
> + if (rc)
> + goto dma_remove;
> + }
> +
> + return rc;
> +
> +dma_remove:
> + dma_async_device_unregister(&mtkd->ddev);
> +rpm_disable:
> + pm_runtime_disable(&pdev->dev);
> +err_no_dma:
> + mtk_dma_free(mtkd);
> + return rc;
> +}
> +
> +static int mtk_apdma_remove(struct platform_device *pdev)
> +{
> + struct mtk_dmadev *mtkd = platform_get_drvdata(pdev);
> +
> + if (pdev->dev.of_node)
> + of_dma_controller_free(pdev->dev.of_node);
> +
> + pm_runtime_disable(&pdev->dev);
> + pm_runtime_put_noidle(&pdev->dev);
> +
> + dma_async_device_unregister(&mtkd->ddev);
> +
> + mtk_dma_free(mtkd);
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int mtk_dma_suspend(struct device *dev)
> +{
> + struct mtk_dmadev *mtkd = dev_get_drvdata(dev);
> +
> + if (!pm_runtime_suspended(dev))
> + mtk_dma_clk_disable(mtkd);
> +
> + return 0;
> +}
> +
> +static int mtk_dma_resume(struct device *dev)
> +{
> + int ret;
> + struct mtk_dmadev *mtkd = dev_get_drvdata(dev);
> +
> + if (!pm_runtime_suspended(dev)) {
> + ret = mtk_dma_clk_enable(mtkd);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int mtk_dma_runtime_suspend(struct device *dev)
> +{
> + struct mtk_dmadev *mtkd = dev_get_drvdata(dev);
> +
> + mtk_dma_clk_disable(mtkd);
> +
> + return 0;
> +}
> +
> +static int mtk_dma_runtime_resume(struct device *dev)
> +{
> + int ret;
> + struct mtk_dmadev *mtkd = dev_get_drvdata(dev);
> +
> + ret = mtk_dma_clk_enable(mtkd);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +#endif /* CONFIG_PM_SLEEP */
> +
> +static const struct dev_pm_ops mtk_dma_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(mtk_dma_suspend, mtk_dma_resume)
> + SET_RUNTIME_PM_OPS(mtk_dma_runtime_suspend,
> + mtk_dma_runtime_resume, NULL)
> +};
> +
> +static struct platform_driver mtk_dma_driver = {
> + .probe = mtk_apdma_probe,
> + .remove = mtk_apdma_remove,
> + .driver = {
> + .name = KBUILD_MODNAME,
> + .pm = &mtk_dma_pm_ops,
> + .of_match_table = of_match_ptr(mtk_uart_dma_match),
> + },
> +};
> +
> +static bool mtk_dma_filter_fn(struct dma_chan *chan, void *param)
> +{
> + if (chan->device->dev->driver == &mtk_dma_driver.driver) {
> + struct mtk_dmadev *mtkd = to_mtk_dma_dev(chan->device);
> + struct mtk_chan *c = to_mtk_dma_chan(chan);
> + unsigned int req = *(unsigned int *)param;
> +
> + if (req <= mtkd->dma_requests) {
> + c->dma_sig = req;
> + c->dma_ch = req;
> + return true;
> + }
> + }
> + return false;
> +}
> +
> +module_platform_driver(mtk_dma_driver);
> +
> +MODULE_DESCRIPTION("MediaTek UART APDMA Controller Driver");
> +MODULE_AUTHOR("Long Cheng <long.cheng@...iatek.com>");
> +MODULE_LICENSE("GPL v2");
> +
> diff --git a/drivers/dma/mediatek/Kconfig b/drivers/dma/mediatek/Kconfig
> index 27bac0b..bef436e 100644
> --- a/drivers/dma/mediatek/Kconfig
> +++ b/drivers/dma/mediatek/Kconfig
> @@ -1,4 +1,15 @@
>
> +config DMA_MTK_UART
> + tristate "MediaTek SoCs APDMA support for UART"
> + depends on OF
> + select DMA_ENGINE
> + select DMA_VIRTUAL_CHANNELS
> + help
> + Support for the UART DMA engine found on MediaTek MTK SoCs.
> + when 8250 mtk uart is enabled, and if you want to using DMA,
> + you can enable the config. the DMA engine just only be used
> + with MediaTek Socs.
> +
> config MTK_HSDMA
> tristate "MediaTek High-Speed DMA controller support"
> depends on ARCH_MEDIATEK || COMPILE_TEST
> diff --git a/drivers/dma/mediatek/Makefile b/drivers/dma/mediatek/Makefile
> index 6e778f8..2f2efd9 100644
> --- a/drivers/dma/mediatek/Makefile
> +++ b/drivers/dma/mediatek/Makefile
> @@ -1 +1,2 @@
> +obj-$(CONFIG_DMA_MTK_UART) += 8250_mtk_dma.o
> obj-$(CONFIG_MTK_HSDMA) += mtk-hsdma.o
> --
> 1.7.9.5
>
>
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek
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