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Message-ID: <20210112120646.GO2771@vkoul-mobl>
Date: Tue, 12 Jan 2021 17:36:46 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Dongjiu Geng <gengdongjiu@...wei.com>
Cc: mturquette@...libre.com, sboyd@...nel.org, robh+dt@...nel.org,
dan.j.williams@...el.com, p.zabel@...gutronix.de,
linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org
Subject: Re: [PATCH v7 4/4] dmaengine: dma: Add Hiedma Controller v310 Device
Driver
On 15-12-20, 11:09, Dongjiu Geng wrote:
> Hisilicon EDMA Controller(EDMAC) directly transfers data
> between a memory and a peripheral, between peripherals, or
> between memories. This avoids the CPU intervention and reduces
> the interrupt handling overhead of the CPU, this driver enables
> this controller.
>
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Dongjiu Geng <gengdongjiu@...wei.com>
> ---
> drivers/dma/Kconfig | 14 +
> drivers/dma/Makefile | 1 +
> drivers/dma/hiedmacv310.c | 1442 +++++++++++++++++++++++++++++++++++++
> drivers/dma/hiedmacv310.h | 136 ++++
> 4 files changed, 1593 insertions(+)
> create mode 100644 drivers/dma/hiedmacv310.c
> create mode 100644 drivers/dma/hiedmacv310.h
>
> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
> index 90284ffda58a..3e5107120ff1 100644
> --- a/drivers/dma/Kconfig
> +++ b/drivers/dma/Kconfig
> @@ -327,6 +327,20 @@ config K3_DMA
> Support the DMA engine for Hisilicon K3 platform
> devices.
>
> +config HIEDMACV310
> + tristate "Hisilicon EDMAC Controller support"
> + depends on ARCH_HISI
> + select DMA_ENGINE
> + select DMA_VIRTUAL_CHANNELS
> + help
> + The Direction Memory Access(EDMA) is a high-speed data transfer
> + operation. It supports data read/write between peripherals and
> + memories without using the CPU.
> + Hisilicon EDMA Controller(EDMAC) directly transfers data between
> + a memory and a peripheral, between peripherals, or between memories.
> + This avoids the CPU intervention and reduces the interrupt handling
> + overhead of the CPU.
> +
> config LPC18XX_DMAMUX
> bool "NXP LPC18xx/43xx DMA MUX for PL080"
> depends on ARCH_LPC18XX || COMPILE_TEST
> diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
> index 948a8da05f8b..28c7298b671e 100644
> --- a/drivers/dma/Makefile
> +++ b/drivers/dma/Makefile
> @@ -82,6 +82,7 @@ obj-$(CONFIG_XGENE_DMA) += xgene-dma.o
> obj-$(CONFIG_ZX_DMA) += zx_dma.o
> obj-$(CONFIG_ST_FDMA) += st_fdma.o
> obj-$(CONFIG_FSL_DPAA2_QDMA) += fsl-dpaa2-qdma/
> +obj-$(CONFIG_HIEDMACV310) += hiedmacv310.o
>
> obj-y += mediatek/
> obj-y += qcom/
> diff --git a/drivers/dma/hiedmacv310.c b/drivers/dma/hiedmacv310.c
> new file mode 100644
> index 000000000000..c0df5088a6a1
> --- /dev/null
> +++ b/drivers/dma/hiedmacv310.c
> @@ -0,0 +1,1442 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * The Hiedma Controller v310 Device Driver for HiSilicon
> + *
> + * Copyright (c) 2019-2020, Huawei Tech. Co., Ltd.
> + *
> + * Author: Dongjiu Geng <gengdongjiu@...wei.com>
> + */
> +
> +#include <linux/debugfs.h>
> +#include <linux/delay.h>
> +#include <linux/clk.h>
> +#include <linux/reset.h>
> +#include <linux/platform_device.h>
> +#include <linux/device.h>
> +#include <linux/dmaengine.h>
> +#include <linux/dmapool.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/export.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_dma.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/seq_file.h>
> +#include <linux/slab.h>
> +#include <linux/io.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>
Do you need all of these? Also keep them sorted pls
> +
> +#include "hiedmacv310.h"
> +#include "dmaengine.h"
> +#include "virt-dma.h"
> +
> +#define DRIVER_NAME "hiedmacv310"
> +
> +#define MAX_TSFR_LLIS 512
> +#define EDMACV300_LLI_WORDS 64
> +#define EDMACV300_POOL_ALIGN 64
> +#define BITS_PER_HALF_WORD 32
Space or tab, not both!
> +
> +struct hiedmac_lli {
> + u64 next_lli;
> + u32 reserved[5];
why reserved..?
> + u32 count;
> + u64 src_addr;
> + u64 dest_addr;
> + u32 config;
> + u32 pad[3];
> +};
> +
> +struct hiedmac_sg {
> + dma_addr_t src_addr;
> + dma_addr_t dst_addr;
> + size_t len;
> + struct list_head node;
> +};
why invent your own sg..? why not use kernel list?
> +
> +struct transfer_desc {
> + struct virt_dma_desc virt_desc;
> + dma_addr_t llis_busaddr;
> + u64 *llis_vaddr;
> + u32 ccfg;
> + size_t size;
> + bool done;
> + bool cyclic;
> +};
> +
> +enum edmac_dma_chan_state {
> + HIEDMAC_CHAN_IDLE,
> + HIEDMAC_CHAN_RUNNING,
> + HIEDMAC_CHAN_PAUSED,
> + HIEDMAC_CHAN_WAITING,
> +};
> +
> +struct hiedmacv310_dma_chan {
> + bool slave;
> + int signal;
> + int id;
> + struct virt_dma_chan virt_chan;
> + struct hiedmacv310_phy_chan *phychan;
> + struct dma_slave_config cfg;
> + struct transfer_desc *at;
> + struct hiedmacv310_driver_data *host;
> + enum edmac_dma_chan_state state;
> +};
> +
> +struct hiedmacv310_phy_chan {
> + unsigned int id;
> + void __iomem *base;
> + spinlock_t lock;
> + struct hiedmacv310_dma_chan *serving;
So you have a physical channel and a dma_chan (virtual..?) right..?
> +};
> +
> +struct hiedmacv310_driver_data {
> + struct platform_device *dev;
> + struct dma_device slave;
> + struct dma_device memcpy;
> + void __iomem *base;
> + struct regmap *misc_regmap;
> + void __iomem *crg_ctrl;
> + struct hiedmacv310_phy_chan *phy_chans;
> + struct dma_pool *pool;
> + unsigned int misc_ctrl_base;
> + int irq;
> + struct clk *clk;
> + struct clk *axi_clk;
> + struct reset_control *rstc;
> + unsigned int channels;
> + unsigned int slave_requests;
> + unsigned int max_transfer_size;
> +};
> +
> +#ifdef DEBUG_HIEDMAC
> +static void dump_lli(const u64 *llis_vaddr, unsigned int num)
> +{
> + struct hiedmac_lli *plli = (struct hiedmac_lli *)llis_vaddr;
> + unsigned int i;
> +
> + hiedmacv310_trace(HIEDMACV310_CONFIG_TRACE_LEVEL, "lli num = 0%d", num);
> + for (i = 0; i < num; i++) {
> + hiedmacv310_info("lli%d:lli_L: 0x%llx\n", i,
> + plli[i].next_lli & 0xffffffff);
> + hiedmacv310_info("lli%d:lli_H: 0x%llx\n", i,
> + (plli[i].next_lli >> BITS_PER_HALF_WORD) & 0xffffffff);
> + hiedmacv310_info("lli%d:count: 0x%x\n", i,
> + plli[i].count);
> + hiedmacv310_info("lli%d:src_addr_L: 0x%llx\n", i,
> + plli[i].src_addr & 0xffffffff);
> + hiedmacv310_info("lli%d:src_addr_H: 0x%llx\n", i,
> + (plli[i].src_addr >> BITS_PER_HALF_WORD) & 0xffffffff);
> + hiedmacv310_info("lli%d:dst_addr_L: 0x%llx\n", i,
> + plli[i].dest_addr & 0xffffffff);
> + hiedmacv310_info("lli%d:dst_addr_H: 0x%llx\n", i,
> + (plli[i].dest_addr >> BITS_PER_HALF_WORD) & 0xffffffff);
> + hiedmacv310_info("lli%d:CONFIG: 0x%x\n", i,
> + plli[i].config);
what is wrong with dev_dbg()..? Tip you can use dynamic debug with them!
> + }
> +}
> +
> +#else
> +static void dump_lli(u64 *llis_vaddr, unsigned int num)
> +{
> +}
> +#endif
> +
> +static inline struct hiedmacv310_dma_chan *to_edamc_chan(const struct dma_chan *chan)
> +{
> + return container_of(chan, struct hiedmacv310_dma_chan, virt_chan.chan);
> +}
> +
> +static inline struct transfer_desc *to_edmac_transfer_desc(
> + const struct dma_async_tx_descriptor *tx)
> +{
> + return container_of(tx, struct transfer_desc, virt_desc.tx);
> +}
> +
> +static struct dma_chan *hiedmac_find_chan_id(
> + const struct hiedmacv310_driver_data *hiedmac,
> + int request_num)
Please run checkpatch --strict that will help you with alignment for
this..
> +{
> + struct hiedmacv310_dma_chan *edmac_dma_chan = NULL;
> +
> + list_for_each_entry(edmac_dma_chan, &hiedmac->slave.channels,
> + virt_chan.chan.device_node) {
> + if (edmac_dma_chan->id == request_num)
> + return &edmac_dma_chan->virt_chan.chan;
> + }
> + return NULL;
> +}
> +
> +static struct dma_chan *hiedma_of_xlate(struct of_phandle_args *dma_spec,
> + struct of_dma *ofdma)
> +{
> + struct hiedmacv310_driver_data *hiedmac = ofdma->of_dma_data;
> + struct hiedmacv310_dma_chan *edmac_dma_chan = NULL;
> + struct dma_chan *dma_chan = NULL;
> + struct regmap *misc = NULL;
> + unsigned int signal, request_num;
> + unsigned int reg = 0;
> + unsigned int offset = 0;
> +
> + if (!hiedmac)
> + return NULL;
> +
> + misc = hiedmac->misc_regmap;
> +
> + if (dma_spec->args_count != 2) { /* check num of dts node args */
> + hiedmacv310_error("args count not true!");
> + return NULL;
> + }
> +
> + request_num = dma_spec->args[0];
> + signal = dma_spec->args[1];
> +
> + if (misc != NULL) {
> + offset = hiedmac->misc_ctrl_base + (request_num & (~0x3));
> + regmap_read(misc, offset, ®);
> + /* set misc for signal line */
> + reg &= ~(0x3f << ((request_num & 0x3) << 3));
> + reg |= signal << ((request_num & 0x3) << 3);
magic numbers..?
> + regmap_write(misc, offset, reg);
> + }
> +
> + hiedmacv310_trace(HIEDMACV310_CONFIG_TRACE_LEVEL,
> + "offset = 0x%x, reg = 0x%x", offset, reg);
> +
> + dma_chan = hiedmac_find_chan_id(hiedmac, request_num);
> + if (!dma_chan) {
> + hiedmacv310_error("DMA slave channel is not found!");
> + return NULL;
> + }
> +
> + edmac_dma_chan = to_edamc_chan(dma_chan);
> + edmac_dma_chan->signal = request_num;
> + return dma_get_slave_channel(dma_chan);
> +}
> +
> +static int hiedmacv310_devm_get(struct hiedmacv310_driver_data *hiedmac)
> +{
> + struct platform_device *platdev = hiedmac->dev;
> + struct resource *res = NULL;
> +
> + hiedmac->clk = devm_clk_get(&(platdev->dev), "apb_pclk");
> + if (IS_ERR(hiedmac->clk))
> + return PTR_ERR(hiedmac->clk);
> +
> + hiedmac->axi_clk = devm_clk_get(&(platdev->dev), "axi_aclk");
> + if (IS_ERR(hiedmac->axi_clk))
> + return PTR_ERR(hiedmac->axi_clk);
> +
> + hiedmac->irq = platform_get_irq(platdev, 0);
> + if (unlikely(hiedmac->irq < 0))
> + return -ENODEV;
> +
> + hiedmac->rstc = devm_reset_control_get(&(platdev->dev), "dma-reset");
> + if (IS_ERR(hiedmac->rstc))
> + return PTR_ERR(hiedmac->rstc);
> +
> + res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + hiedmacv310_error("no reg resource");
> + return -ENODEV;
> + }
> +
> + hiedmac->base = devm_ioremap_resource(&(platdev->dev), res);
> + if (IS_ERR(hiedmac->base))
> + return PTR_ERR(hiedmac->base);
> +
> + return 0;
> +}
> +
> +static int hiedmacv310_of_property_read(struct hiedmacv310_driver_data *hiedmac)
> +{
> + struct platform_device *platdev = hiedmac->dev;
> + struct device_node *np = platdev->dev.of_node;
> + int ret;
> +
> + hiedmac->misc_regmap = syscon_regmap_lookup_by_phandle(np, "hisilicon,misc-control");
why are looking up something else here..?
> + if (IS_ERR(hiedmac->misc_regmap))
> + return PTR_ERR(hiedmac->misc_regmap);
> +
> + ret = of_property_read_u32_index(np, "hisilicon,misc-control", 1,
> + &(hiedmac->misc_ctrl_base));
> + if (ret) {
> + hiedmacv310_error("get dma-misc_ctrl_base fail");
> + return -ENODEV;
> + }
> +
> + ret = of_property_read_u32(np, "dma-channels", &(hiedmac->channels));
> + if (ret) {
> + hiedmacv310_error("get dma-channels fail");
> + return -ENODEV;
> + }
> + ret = of_property_read_u32(np, "dma-requests", &(hiedmac->slave_requests));
> + if (ret) {
> + hiedmacv310_error("get dma-requests fail");
> + return -ENODEV;
> + }
> + hiedmacv310_trace(HIEDMACV310_REG_TRACE_LEVEL, "dma-channels = %d, dma-requests = %d",
> + hiedmac->channels, hiedmac->slave_requests);
> + return 0;
> +}
> +
> +static int get_of_probe(struct hiedmacv310_driver_data *hiedmac)
> +{
> + struct platform_device *platdev = hiedmac->dev;
> + int ret;
> +
> + ret = hiedmacv310_devm_get(hiedmac);
> + if (ret)
> + return ret;
> +
> + ret = hiedmacv310_of_property_read(hiedmac);
> + if (ret)
> + return ret;
> +
> + return of_dma_controller_register(platdev->dev.of_node,
> + hiedma_of_xlate, hiedmac);
> +}
> +
> +static void hiedmac_free_chan_resources(struct dma_chan *chan)
> +{
> + vchan_free_chan_resources(to_virt_chan(chan));
> +}
> +
> +static size_t read_residue_from_phychan(
> + struct hiedmacv310_dma_chan *edmac_dma_chan,
> + struct transfer_desc *tsf_desc)
> +{
> + size_t bytes;
> + u64 next_lli;
> + struct hiedmacv310_phy_chan *phychan = edmac_dma_chan->phychan;
> + unsigned int i, index;
> + struct hiedmacv310_driver_data *hiedmac = edmac_dma_chan->host;
> + struct hiedmac_lli *plli = NULL;
reverse christmas tree pls
> +
> + next_lli = (hiedmacv310_readl(hiedmac->base + hiedmac_cx_lli_l(phychan->id)) &
> + (~(HIEDMAC_LLI_ALIGN - 1)));
> + next_lli |= ((u64)(hiedmacv310_readl(hiedmac->base + hiedmac_cx_lli_h(
> + phychan->id)) & 0xffffffff) << BITS_PER_HALF_WORD);
> + bytes = hiedmacv310_readl(hiedmac->base + hiedmac_cx_curr_cnt0(
> + phychan->id));
> + if (next_lli != 0) {
> + /* It means lli mode */
> + bytes += tsf_desc->size;
> + index = (next_lli - tsf_desc->llis_busaddr) / sizeof(*plli);
> + plli = (struct hiedmac_lli *)(tsf_desc->llis_vaddr);
> + for (i = 0; i < index; i++)
> + bytes -= plli[i].count;
> + }
> + return bytes;
> +}
> +
> +static enum dma_status hiedmac_tx_status(struct dma_chan *chan,
> + dma_cookie_t cookie,
> + struct dma_tx_state *txstate)
> +{
> + enum dma_status ret;
> + struct hiedmacv310_dma_chan *edmac_dma_chan = to_edamc_chan(chan);
> + struct virt_dma_desc *vd = NULL;
> + struct transfer_desc *tsf_desc = NULL;
> + unsigned long flags;
> + size_t bytes;
> +
> + ret = dma_cookie_status(chan, cookie, txstate);
> + if (ret == DMA_COMPLETE)
> + return ret;
residue can be NULL so no need to continue for that
> +
> + if (edmac_dma_chan->state == HIEDMAC_CHAN_PAUSED && ret == DMA_IN_PROGRESS) {
> + ret = DMA_PAUSED;
> + return ret;
> + }
> +
> + spin_lock_irqsave(&edmac_dma_chan->virt_chan.lock, flags);
> + vd = vchan_find_desc(&edmac_dma_chan->virt_chan, cookie);
> + if (vd) {
> + /* no been trasfered */
> + tsf_desc = to_edmac_transfer_desc(&vd->tx);
> + bytes = tsf_desc->size;
> + } else {
> + /* trasfering */
> + tsf_desc = edmac_dma_chan->at;
> +
> + if (!(edmac_dma_chan->phychan) || !tsf_desc) {
> + spin_unlock_irqrestore(&edmac_dma_chan->virt_chan.lock, flags);
> + return ret;
> + }
> + bytes = read_residue_from_phychan(edmac_dma_chan, tsf_desc);
> + }
> + spin_unlock_irqrestore(&edmac_dma_chan->virt_chan.lock, flags);
> + dma_set_residue(txstate, bytes);
> + return ret;
> +}
> +
> +static struct hiedmacv310_phy_chan *hiedmac_get_phy_channel(
> + const struct hiedmacv310_driver_data *hiedmac,
> + struct hiedmacv310_dma_chan *edmac_dma_chan)
> +{
> + struct hiedmacv310_phy_chan *ch = NULL;
> + unsigned long flags;
> + int i;
> +
> + for (i = 0; i < hiedmac->channels; i++) {
> + ch = &hiedmac->phy_chans[i];
> +
> + spin_lock_irqsave(&ch->lock, flags);
> +
> + if (!ch->serving) {
> + ch->serving = edmac_dma_chan;
> + spin_unlock_irqrestore(&ch->lock, flags);
> + break;
> + }
> + spin_unlock_irqrestore(&ch->lock, flags);
> + }
> +
> + if (i == hiedmac->channels)
> + return NULL;
> +
> + return ch;
> +}
> +
> +static void hiedmac_write_lli(const struct hiedmacv310_driver_data *hiedmac,
> + const struct hiedmacv310_phy_chan *phychan,
> + const struct transfer_desc *tsf_desc)
> +{
> + struct hiedmac_lli *plli = (struct hiedmac_lli *)tsf_desc->llis_vaddr;
> +
> + if (plli->next_lli != 0x0)
> + hiedmacv310_writel((plli->next_lli & 0xffffffff) | HIEDMAC_LLI_ENABLE,
> + hiedmac->base + hiedmac_cx_lli_l(phychan->id));
> + else
> + hiedmacv310_writel((plli->next_lli & 0xffffffff),
> + hiedmac->base + hiedmac_cx_lli_l(phychan->id));
> +
> + hiedmacv310_writel(((plli->next_lli >> 32) & 0xffffffff),
> + hiedmac->base + hiedmac_cx_lli_h(phychan->id));
> + hiedmacv310_writel(plli->count, hiedmac->base + hiedmac_cx_cnt0(phychan->id));
> + hiedmacv310_writel(plli->src_addr & 0xffffffff,
> + hiedmac->base + hiedmac_cx_src_addr_l(phychan->id));
> + hiedmacv310_writel((plli->src_addr >> 32) & 0xffffffff,
> + hiedmac->base + hiedmac_cx_src_addr_h(phychan->id));
> + hiedmacv310_writel(plli->dest_addr & 0xffffffff,
> + hiedmac->base + hiedmac_cx_dest_addr_l(phychan->id));
> + hiedmacv310_writel((plli->dest_addr >> 32) & 0xffffffff,
> + hiedmac->base + hiedmac_cx_dest_addr_h(phychan->id));
> + hiedmacv310_writel(plli->config,
> + hiedmac->base + hiedmac_cx_config(phychan->id));
> +}
> +
> +static void hiedmac_start_next_txd(struct hiedmacv310_dma_chan *edmac_dma_chan)
> +{
> + struct hiedmacv310_driver_data *hiedmac = edmac_dma_chan->host;
> + struct hiedmacv310_phy_chan *phychan = edmac_dma_chan->phychan;
> + struct virt_dma_desc *vd = vchan_next_desc(&edmac_dma_chan->virt_chan);
> + struct transfer_desc *tsf_desc = to_edmac_transfer_desc(&vd->tx);
> + unsigned int val;
> +
> + list_del(&tsf_desc->virt_desc.node);
> + edmac_dma_chan->at = tsf_desc;
> + hiedmac_write_lli(hiedmac, phychan, tsf_desc);
> + val = hiedmacv310_readl(hiedmac->base + hiedmac_cx_config(phychan->id));
> + hiedmacv310_trace(HIEDMACV310_REG_TRACE_LEVEL, " HIEDMAC_Cx_CONFIG = 0x%x", val);
> + hiedmacv310_writel(val | HIEDMAC_CXCONFIG_LLI_START,
> + hiedmac->base + hiedmac_cx_config(phychan->id));
> +}
> +
> +static void hiedmac_start(struct hiedmacv310_dma_chan *edmac_dma_chan)
> +{
> + struct hiedmacv310_driver_data *hiedmac = edmac_dma_chan->host;
> + struct hiedmacv310_phy_chan *ch;
> +
> + ch = hiedmac_get_phy_channel(hiedmac, edmac_dma_chan);
> + if (!ch) {
> + hiedmacv310_error("no phy channel available !");
> + edmac_dma_chan->state = HIEDMAC_CHAN_WAITING;
> + return;
> + }
> + edmac_dma_chan->phychan = ch;
> + edmac_dma_chan->state = HIEDMAC_CHAN_RUNNING;
> + hiedmac_start_next_txd(edmac_dma_chan);
> +}
> +
> +static void hiedmac_issue_pending(struct dma_chan *chan)
> +{
> + struct hiedmacv310_dma_chan *edmac_dma_chan = to_edamc_chan(chan);
> + unsigned long flags;
> +
> + spin_lock_irqsave(&edmac_dma_chan->virt_chan.lock, flags);
> + if (vchan_issue_pending(&edmac_dma_chan->virt_chan)) {
> + if (!edmac_dma_chan->phychan && edmac_dma_chan->state != HIEDMAC_CHAN_WAITING)
> + hiedmac_start(edmac_dma_chan);
> + }
> + spin_unlock_irqrestore(&edmac_dma_chan->virt_chan.lock, flags);
> +}
> +
> +static void hiedmac_free_txd_list(struct hiedmacv310_dma_chan *edmac_dma_chan)
> +{
> + LIST_HEAD(head);
> +
> + vchan_get_all_descriptors(&edmac_dma_chan->virt_chan, &head);
> + vchan_dma_desc_free_list(&edmac_dma_chan->virt_chan, &head);
> +}
> +
> +static int hiedmac_config(struct dma_chan *chan,
> + struct dma_slave_config *config)
> +{
> + struct hiedmacv310_dma_chan *edmac_dma_chan = to_edamc_chan(chan);
> +
> + if (!edmac_dma_chan->slave) {
> + hiedmacv310_error("slave is null!");
> + return -EINVAL;
> + }
> + edmac_dma_chan->cfg = *config;
not memcpy of the data..?
> + return 0;
> +}
> +
> +static void hiedmac_pause_phy_chan(const struct hiedmacv310_dma_chan *edmac_dma_chan)
> +{
> + struct hiedmacv310_driver_data *hiedmac = edmac_dma_chan->host;
> + struct hiedmacv310_phy_chan *phychan = edmac_dma_chan->phychan;
> + unsigned int val;
> + int timeout;
> +
> + val = hiedmacv310_readl(hiedmac->base + hiedmac_cx_config(phychan->id));
> + val &= ~CCFG_EN;
> + hiedmacv310_writel(val, hiedmac->base + hiedmac_cx_config(phychan->id));
> + /* Wait for channel inactive */
> + for (timeout = 2000; timeout > 0; timeout--) {
> + if (!((0x1 << phychan->id) & hiedmacv310_readl(hiedmac->base + HIEDMAC_CH_STAT)))
> + break;
> + hiedmacv310_writel(val, hiedmac->base + hiedmac_cx_config(phychan->id));
> + udelay(1);
> + }
> +
> + if (timeout == 0) {
> + hiedmacv310_error(":channel%u timeout waiting for pause, timeout:%d",
> + phychan->id, timeout);
> + }
braces seem not required
> +}
> +
> +static int hiedmac_pause(struct dma_chan *chan)
> +{
> + struct hiedmacv310_dma_chan *edmac_dma_chan = to_edamc_chan(chan);
> + unsigned long flags;
> +
> + spin_lock_irqsave(&edmac_dma_chan->virt_chan.lock, flags);
> + if (!edmac_dma_chan->phychan) {
> + spin_unlock_irqrestore(&edmac_dma_chan->virt_chan.lock, flags);
> + return 0;
> + }
> + hiedmac_pause_phy_chan(edmac_dma_chan);
> + edmac_dma_chan->state = HIEDMAC_CHAN_PAUSED;
> + spin_unlock_irqrestore(&edmac_dma_chan->virt_chan.lock, flags);
> + return 0;
> +}
> +
> +static void hiedmac_resume_phy_chan(const struct hiedmacv310_dma_chan *edmac_dma_chan)
> +{
> + struct hiedmacv310_driver_data *hiedmac = edmac_dma_chan->host;
> + struct hiedmacv310_phy_chan *phychan = edmac_dma_chan->phychan;
> + unsigned int val;
> +
> + val = hiedmacv310_readl(hiedmac->base + hiedmac_cx_config(phychan->id));
> + val |= CCFG_EN;
> + hiedmacv310_writel(val, hiedmac->base + hiedmac_cx_config(phychan->id));
> +}
> +
> +static int hiedmac_resume(struct dma_chan *chan)
> +{
> + struct hiedmacv310_dma_chan *edmac_dma_chan = to_edamc_chan(chan);
> + unsigned long flags;
> +
> + spin_lock_irqsave(&edmac_dma_chan->virt_chan.lock, flags);
> +
> + if (!edmac_dma_chan->phychan) {
> + spin_unlock_irqrestore(&edmac_dma_chan->virt_chan.lock, flags);
> + return 0;
> + }
> +
> + hiedmac_resume_phy_chan(edmac_dma_chan);
> + edmac_dma_chan->state = HIEDMAC_CHAN_RUNNING;
> + spin_unlock_irqrestore(&edmac_dma_chan->virt_chan.lock, flags);
> +
> + return 0;
> +}
> +
> +void hiedmac_phy_free(struct hiedmacv310_dma_chan *chan);
> +static void hiedmac_desc_free(struct virt_dma_desc *vd);
why not define them here..?
> +static int hiedmac_terminate_all(struct dma_chan *chan)
> +{
> + struct hiedmacv310_dma_chan *edmac_dma_chan = to_edamc_chan(chan);
> + unsigned long flags;
> +
> + spin_lock_irqsave(&edmac_dma_chan->virt_chan.lock, flags);
> + if (!edmac_dma_chan->phychan && !edmac_dma_chan->at) {
> + spin_unlock_irqrestore(&edmac_dma_chan->virt_chan.lock, flags);
> + return 0;
> + }
> +
> + edmac_dma_chan->state = HIEDMAC_CHAN_IDLE;
> +
> + if (edmac_dma_chan->phychan)
> + hiedmac_phy_free(edmac_dma_chan);
> + if (edmac_dma_chan->at) {
> + hiedmac_desc_free(&edmac_dma_chan->at->virt_desc);
> + edmac_dma_chan->at = NULL;
> + }
> + hiedmac_free_txd_list(edmac_dma_chan);
> + spin_unlock_irqrestore(&edmac_dma_chan->virt_chan.lock, flags);
> +
> + return 0;
> +}
> +
> +static u32 get_width(enum dma_slave_buswidth width)
> +{
> + switch (width) {
> + case DMA_SLAVE_BUSWIDTH_1_BYTE:
> + return HIEDMAC_WIDTH_8BIT;
> + case DMA_SLAVE_BUSWIDTH_2_BYTES:
> + return HIEDMAC_WIDTH_16BIT;
> + case DMA_SLAVE_BUSWIDTH_4_BYTES:
> + return HIEDMAC_WIDTH_32BIT;
> + case DMA_SLAVE_BUSWIDTH_8_BYTES:
> + return HIEDMAC_WIDTH_64BIT;
sounds like ffs(width) - 1 to me..
> + default:
> + hiedmacv310_error("check here, width warning!");
> + return ~0;
> + }
> +}
> +
> +static unsigned int hiedmac_set_config_value(enum dma_transfer_direction direction,
> + unsigned int addr_width,
> + unsigned int burst,
> + unsigned int signal)
> +{
> + unsigned int config, width;
> +
> + if (direction == DMA_MEM_TO_DEV)
> + config = HIEDMAC_CONFIG_SRC_INC;
> + else
> + config = HIEDMAC_CONFIG_DST_INC;
> +
> + hiedmacv310_trace(HIEDMACV310_CONFIG_TRACE_LEVEL, "addr_width = 0x%x", addr_width);
> + width = get_width(addr_width);
> + hiedmacv310_trace(HIEDMACV310_CONFIG_TRACE_LEVEL, "width = 0x%x", width);
> + config |= width << HIEDMAC_CONFIG_SRC_WIDTH_SHIFT;
> + config |= width << HIEDMAC_CONFIG_DST_WIDTH_SHIFT;
> + hiedmacv310_trace(HIEDMACV310_REG_TRACE_LEVEL, "tsf_desc->ccfg = 0x%x", config);
> + hiedmacv310_trace(HIEDMACV310_CONFIG_TRACE_LEVEL, "burst = 0x%x", burst);
> + config |= burst << HIEDMAC_CONFIG_SRC_BURST_SHIFT;
> + config |= burst << HIEDMAC_CONFIG_DST_BURST_SHIFT;
> + if (signal >= 0) {
> + hiedmacv310_trace(HIEDMACV310_REG_TRACE_LEVEL,
> + "edmac_dma_chan->signal = %d", signal);
> + config |= (unsigned int)signal << HIEDMAC_CXCONFIG_SIGNAL_SHIFT;
> + }
> + config |= HIEDMAC_CXCONFIG_DEV_MEM_TYPE << HIEDMAC_CXCONFIG_TSF_TYPE_SHIFT;
> + return config;
> +}
> +
> +static struct transfer_desc *hiedmac_init_tsf_desc(struct dma_chan *chan,
> + enum dma_transfer_direction direction,
> + dma_addr_t *slave_addr)
> +{
> + struct hiedmacv310_dma_chan *edmac_dma_chan = to_edamc_chan(chan);
> + struct transfer_desc *tsf_desc;
> + unsigned int burst = 0;
> + unsigned int addr_width = 0;
> + unsigned int maxburst = 0;
> +
> + tsf_desc = kzalloc(sizeof(*tsf_desc), GFP_NOWAIT);
> + if (!tsf_desc)
> + return NULL;
> + if (direction == DMA_MEM_TO_DEV) {
> + *slave_addr = edmac_dma_chan->cfg.dst_addr;
> + addr_width = edmac_dma_chan->cfg.dst_addr_width;
> + maxburst = edmac_dma_chan->cfg.dst_maxburst;
> + } else if (direction == DMA_DEV_TO_MEM) {
> + *slave_addr = edmac_dma_chan->cfg.src_addr;
> + addr_width = edmac_dma_chan->cfg.src_addr_width;
> + maxburst = edmac_dma_chan->cfg.src_maxburst;
> + } else {
> + kfree(tsf_desc);
> + hiedmacv310_error("direction unsupported!");
> + return NULL;
> + }
> +
> + if (maxburst > (HIEDMAC_MAX_BURST_WIDTH))
> + burst |= (HIEDMAC_MAX_BURST_WIDTH - 1);
> + else if (maxburst == 0)
> + burst |= HIEDMAC_MIN_BURST_WIDTH;
> + else
> + burst |= (maxburst - 1);
> +
> + tsf_desc->ccfg = hiedmac_set_config_value(direction, addr_width,
> + burst, edmac_dma_chan->signal);
> + hiedmacv310_trace(HIEDMACV310_REG_TRACE_LEVEL, "tsf_desc->ccfg = 0x%x", tsf_desc->ccfg);
> + return tsf_desc;
> +}
> +
> +static int hiedmac_fill_desc(const struct hiedmac_sg *dsg,
> + struct transfer_desc *tsf_desc,
> + unsigned int length, unsigned int num)
> +{
> + struct hiedmac_lli *plli = NULL;
> +
> + if (num >= MAX_TSFR_LLIS) {
> + hiedmacv310_error("lli out of range.");
> + return -ENOMEM;
> + }
> +
> + plli = (struct hiedmac_lli *)(tsf_desc->llis_vaddr);
> + memset(&plli[num], 0x0, sizeof(*plli));
> +
> + plli[num].src_addr = dsg->src_addr;
> + plli[num].dest_addr = dsg->dst_addr;
> + plli[num].config = tsf_desc->ccfg;
> + plli[num].count = length;
> + tsf_desc->size += length;
> +
> + if (num > 0) {
> + plli[num - 1].next_lli = (tsf_desc->llis_busaddr + (num) * sizeof(
> + *plli)) & (~(HIEDMAC_LLI_ALIGN - 1));
> + plli[num - 1].next_lli |= HIEDMAC_LLI_ENABLE;
> + }
> + return 0;
> +}
> +
> +static void free_dsg(struct list_head *dsg_head)
> +{
> + struct hiedmac_sg *dsg = NULL;
> + struct hiedmac_sg *_dsg = NULL;
> +
> + list_for_each_entry_safe(dsg, _dsg, dsg_head, node) {
> + list_del(&dsg->node);
> + kfree(dsg);
> + }
> +}
> +
> +static int hiedmac_add_sg(struct list_head *sg_head,
> + dma_addr_t dst, dma_addr_t src,
> + size_t len)
> +{
> + struct hiedmac_sg *dsg = NULL;
> +
> + if (len == 0) {
> + hiedmacv310_error("Transfer length is 0.");
> + return -ENOMEM;
> + }
> +
> + dsg = kzalloc(sizeof(*dsg), GFP_NOWAIT);
> + if (!dsg) {
> + free_dsg(sg_head);
> + hiedmacv310_error("alloc memory for dsg fail.");
> + return -ENOMEM;
> + }
> +
> + list_add_tail(&dsg->node, sg_head);
> + dsg->src_addr = src;
> + dsg->dst_addr = dst;
> + dsg->len = len;
> + return 0;
> +}
> +
> +static int hiedmac_add_sg_slave(struct list_head *sg_head,
> + dma_addr_t slave_addr, dma_addr_t addr,
> + size_t length,
> + enum dma_transfer_direction direction)
> +{
> + dma_addr_t src = 0;
> + dma_addr_t dst = 0;
> +
> + if (direction == DMA_MEM_TO_DEV) {
> + src = addr;
> + dst = slave_addr;
> + } else if (direction == DMA_DEV_TO_MEM) {
> + src = slave_addr;
> + dst = addr;
> + } else {
> + hiedmacv310_error("invali dma_transfer_direction.");
> + return -ENOMEM;
> + }
> + return hiedmac_add_sg(sg_head, dst, src, length);
> +}
> +
> +static int hiedmac_fill_sg_for_slave(struct list_head *sg_head,
> + dma_addr_t slave_addr,
> + struct scatterlist *sgl,
> + unsigned int sg_len,
> + enum dma_transfer_direction direction)
> +{
> + struct scatterlist *sg = NULL;
> + int tmp, ret;
> + size_t length;
> + dma_addr_t addr;
> +
> + if (sgl == NULL) {
> + hiedmacv310_error("sgl is null!");
> + return -ENOMEM;
> + }
> +
> + for_each_sg(sgl, sg, sg_len, tmp) {
> + addr = sg_dma_address(sg);
> + length = sg_dma_len(sg);
> + ret = hiedmac_add_sg_slave(sg_head, slave_addr, addr, length, direction);
> + if (ret)
> + break;
> + }
> + return ret;
> +}
> +
> +static inline int hiedmac_fill_sg_for_memcpy(struct list_head *sg_head,
> + dma_addr_t dst, dma_addr_t src,
> + size_t len)
> +{
> + return hiedmac_add_sg(sg_head, dst, src, len);
> +}
> +
> +static int hiedmac_fill_sg_for_cyclic(struct list_head *sg_head,
> + dma_addr_t slave_addr,
> + dma_addr_t buf_addr, size_t buf_len,
> + size_t period_len,
> + enum dma_transfer_direction direction)
> +{
> + size_t count_in_sg = 0;
> + size_t trans_bytes;
> + int ret;
> +
> + while (count_in_sg < buf_len) {
> + trans_bytes = min(period_len, buf_len - count_in_sg);
> + count_in_sg += trans_bytes;
> + ret = hiedmac_add_sg_slave(sg_head, slave_addr,
> + buf_addr + count_in_sg,
> + count_in_sg, direction);
> + if (ret)
> + return ret;
> + }
> + return 0;
> +}
> +
> +static inline unsigned short get_max_width(dma_addr_t ccfg)
> +{
> + unsigned short src_width = (ccfg & HIEDMAC_CONTROL_SRC_WIDTH_MASK) >>
> + HIEDMAC_CONFIG_SRC_WIDTH_SHIFT;
> + unsigned short dst_width = (ccfg & HIEDMAC_CONTROL_DST_WIDTH_MASK) >>
> + HIEDMAC_CONFIG_DST_WIDTH_SHIFT;
> +
> + return 1 << max(src_width, dst_width); /* to byte */
> +}
> +
> +static int hiedmac_fill_asg_lli_for_desc(struct hiedmac_sg *dsg,
> + struct transfer_desc *tsf_desc,
> + unsigned int *lli_count)
> +{
> + int ret;
> + unsigned short width = get_max_width(tsf_desc->ccfg);
> +
> + while (dsg->len != 0) {
> + size_t lli_len = MAX_TRANSFER_BYTES;
> +
> + lli_len = (lli_len / width) * width; /* bus width align */
> + lli_len = min(lli_len, dsg->len);
> + ret = hiedmac_fill_desc(dsg, tsf_desc, lli_len, *lli_count);
> + if (ret)
> + return ret;
> +
> + if (tsf_desc->ccfg & HIEDMAC_CONFIG_SRC_INC)
> + dsg->src_addr += lli_len;
> + if (tsf_desc->ccfg & HIEDMAC_CONFIG_DST_INC)
> + dsg->dst_addr += lli_len;
> + dsg->len -= lli_len;
> + (*lli_count)++;
> + }
> + return 0;
> +}
> +
> +static int hiedmac_fill_lli_for_desc(struct list_head *sg_head,
> + struct transfer_desc *tsf_desc)
> +{
> + struct hiedmac_sg *dsg = NULL;
> + struct hiedmac_lli *last_plli = NULL;
> + unsigned int lli_count = 0;
> + int ret;
> +
> + list_for_each_entry(dsg, sg_head, node) {
> + ret = hiedmac_fill_asg_lli_for_desc(dsg, tsf_desc, &lli_count);
> + if (ret)
> + return ret;
> + }
> +
> + if (tsf_desc->cyclic) {
> + last_plli = (struct hiedmac_lli *)((uintptr_t)tsf_desc->llis_vaddr +
> + (lli_count - 1) * sizeof(*last_plli));
> + last_plli->next_lli = tsf_desc->llis_busaddr | HIEDMAC_LLI_ENABLE;
> + } else {
> + last_plli = (struct hiedmac_lli *)((uintptr_t)tsf_desc->llis_vaddr +
> + (lli_count - 1) * sizeof(*last_plli));
> + last_plli->next_lli = 0;
> + }
> + dump_lli(tsf_desc->llis_vaddr, lli_count);
> + return 0;
> +}
> +
> +static struct dma_async_tx_descriptor *hiedmac_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 hiedmacv310_dma_chan *edmac_dma_chan = to_edamc_chan(chan);
> + struct hiedmacv310_driver_data *hiedmac = edmac_dma_chan->host;
> + struct transfer_desc *tsf_desc = NULL;
> + dma_addr_t slave_addr = 0;
> + int ret;
> + LIST_HEAD(sg_head);
> +
> + if (sgl == NULL) {
> + hiedmacv310_error("sgl is null!");
> + return NULL;
> + }
> +
> + tsf_desc = hiedmac_init_tsf_desc(chan, direction, &slave_addr);
> + if (!tsf_desc)
> + return NULL;
> +
> + tsf_desc->llis_vaddr = dma_pool_alloc(hiedmac->pool, GFP_NOWAIT,
> + &tsf_desc->llis_busaddr);
> + if (!tsf_desc->llis_vaddr) {
> + hiedmacv310_error("malloc memory from pool fail !");
> + goto err_alloc_lli;
> + }
> +
> + ret = hiedmac_fill_sg_for_slave(&sg_head, slave_addr, sgl, sg_len, direction);
> + if (ret)
> + goto err_fill_sg;
> + ret = hiedmac_fill_lli_for_desc(&sg_head, tsf_desc);
> + free_dsg(&sg_head);
> + if (ret)
> + goto err_fill_sg;
> + return vchan_tx_prep(&edmac_dma_chan->virt_chan, &tsf_desc->virt_desc, flags);
> +
> +err_fill_sg:
> + dma_pool_free(hiedmac->pool, tsf_desc->llis_vaddr, tsf_desc->llis_busaddr);
> +err_alloc_lli:
> + kfree(tsf_desc);
> + return NULL;
> +}
> +
> +static struct dma_async_tx_descriptor *hiedmac_prep_dma_memcpy(
> + struct dma_chan *chan, dma_addr_t dst, dma_addr_t src,
> + size_t len, unsigned long flags)
> +{
> + struct hiedmacv310_dma_chan *edmac_dma_chan = to_edamc_chan(chan);
> + struct hiedmacv310_driver_data *hiedmac = edmac_dma_chan->host;
> + struct transfer_desc *tsf_desc = NULL;
> + LIST_HEAD(sg_head);
> + u32 config = 0;
> + int ret;
> +
> + if (!len)
> + return NULL;
> +
> + tsf_desc = kzalloc(sizeof(*tsf_desc), GFP_NOWAIT);
> + if (tsf_desc == NULL) {
> + hiedmacv310_error("get tsf desc fail!");
> + return NULL;
> + }
> +
> + tsf_desc->llis_vaddr = dma_pool_alloc(hiedmac->pool, GFP_NOWAIT,
> + &tsf_desc->llis_busaddr);
> + if (!tsf_desc->llis_vaddr) {
> + hiedmacv310_error("malloc memory from pool fail !");
> + goto err_alloc_lli;
> + }
> +
> + config |= HIEDMAC_CONFIG_SRC_INC | HIEDMAC_CONFIG_DST_INC;
> + config |= HIEDMAC_CXCONFIG_MEM_TYPE << HIEDMAC_CXCONFIG_TSF_TYPE_SHIFT;
> + /* max burst width is 16 ,but reg value set 0xf */
> + config |= (HIEDMAC_MAX_BURST_WIDTH - 1) << HIEDMAC_CONFIG_SRC_BURST_SHIFT;
> + config |= (HIEDMAC_MAX_BURST_WIDTH - 1) << HIEDMAC_CONFIG_DST_BURST_SHIFT;
> + config |= HIEDMAC_MEM_BIT_WIDTH << HIEDMAC_CONFIG_SRC_WIDTH_SHIFT;
> + config |= HIEDMAC_MEM_BIT_WIDTH << HIEDMAC_CONFIG_DST_WIDTH_SHIFT;
> + tsf_desc->ccfg = config;
> + ret = hiedmac_fill_sg_for_memcpy(&sg_head, dst, src, len);
> + if (ret)
> + goto err_fill_sg;
> + ret = hiedmac_fill_lli_for_desc(&sg_head, tsf_desc);
> + free_dsg(&sg_head);
> + if (ret)
> + goto err_fill_sg;
> + return vchan_tx_prep(&edmac_dma_chan->virt_chan, &tsf_desc->virt_desc, flags);
> +
> +err_fill_sg:
> + dma_pool_free(hiedmac->pool, tsf_desc->llis_vaddr, tsf_desc->llis_busaddr);
> +err_alloc_lli:
> + kfree(tsf_desc);
> + return NULL;
> +}
> +
> +
> +static struct dma_async_tx_descriptor *hiedmac_prep_dma_cyclic(
> + struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
> + size_t period_len, enum dma_transfer_direction direction,
> + unsigned long flags)
> +{
> + struct hiedmacv310_dma_chan *edmac_dma_chan = to_edamc_chan(chan);
> + struct hiedmacv310_driver_data *hiedmac = edmac_dma_chan->host;
> + struct transfer_desc *tsf_desc = NULL;
> + dma_addr_t slave_addr = 0;
> + LIST_HEAD(sg_head);
> + int ret;
> +
> + tsf_desc = hiedmac_init_tsf_desc(chan, direction, &slave_addr);
> + if (!tsf_desc)
> + return NULL;
> +
> + tsf_desc->llis_vaddr = dma_pool_alloc(hiedmac->pool, GFP_NOWAIT,
> + &tsf_desc->llis_busaddr);
> + if (!tsf_desc->llis_vaddr) {
> + hiedmacv310_error("malloc memory from pool fail !");
> + goto err_alloc_lli;
> + }
> +
> + tsf_desc->cyclic = true;
> + ret = hiedmac_fill_sg_for_cyclic(&sg_head, slave_addr, buf_addr,
> + buf_len, period_len, direction);
> + if (ret)
> + goto err_fill_sg;
> + ret = hiedmac_fill_lli_for_desc(&sg_head, tsf_desc);
> + free_dsg(&sg_head);
> + if (ret)
> + goto err_fill_sg;
> + return vchan_tx_prep(&edmac_dma_chan->virt_chan, &tsf_desc->virt_desc, flags);
> +
> +err_fill_sg:
> + dma_pool_free(hiedmac->pool, tsf_desc->llis_vaddr, tsf_desc->llis_busaddr);
> +err_alloc_lli:
> + kfree(tsf_desc);
> + return NULL;
> +}
> +
> +static void hiedmac_phy_reassign(struct hiedmacv310_phy_chan *phy_chan,
> + struct hiedmacv310_dma_chan *chan)
> +{
> + phy_chan->serving = chan;
> + chan->phychan = phy_chan;
> + chan->state = HIEDMAC_CHAN_RUNNING;
> +
> + hiedmac_start_next_txd(chan);
> +}
> +
> +static void hiedmac_terminate_phy_chan(struct hiedmacv310_driver_data *hiedmac,
> + const struct hiedmacv310_dma_chan *edmac_dma_chan)
> +{
> + unsigned int val;
> + struct hiedmacv310_phy_chan *phychan = edmac_dma_chan->phychan;
> +
> + hiedmac_pause_phy_chan(edmac_dma_chan);
> + val = 0x1 << phychan->id;
> + hiedmacv310_writel(val, hiedmac->base + HIEDMAC_INT_TC1_RAW);
> + hiedmacv310_writel(val, hiedmac->base + HIEDMAC_INT_ERR1_RAW);
> + hiedmacv310_writel(val, hiedmac->base + HIEDMAC_INT_ERR2_RAW);
> +}
> +
> +void hiedmac_phy_free(struct hiedmacv310_dma_chan *chan)
> +{
> + struct hiedmacv310_driver_data *hiedmac = chan->host;
> + struct hiedmacv310_dma_chan *p = NULL;
> + struct hiedmacv310_dma_chan *next = NULL;
> +
> + list_for_each_entry(p, &hiedmac->memcpy.channels, virt_chan.chan.device_node) {
> + if (p->state == HIEDMAC_CHAN_WAITING) {
> + next = p;
> + break;
> + }
> + }
> +
> + if (!next) {
> + list_for_each_entry(p, &hiedmac->slave.channels, virt_chan.chan.device_node) {
> + if (p->state == HIEDMAC_CHAN_WAITING) {
> + next = p;
> + break;
> + }
> + }
> + }
> + hiedmac_terminate_phy_chan(hiedmac, chan);
> +
> + if (next) {
> + spin_lock(&next->virt_chan.lock);
> + hiedmac_phy_reassign(chan->phychan, next);
> + spin_unlock(&next->virt_chan.lock);
> + } else {
> + chan->phychan->serving = NULL;
> + }
> +
> + chan->phychan = NULL;
> + chan->state = HIEDMAC_CHAN_IDLE;
> +}
> +
> +static bool handle_irq(struct hiedmacv310_driver_data *hiedmac, int chan_id)
> +{
> + struct hiedmacv310_dma_chan *chan = NULL;
> + struct hiedmacv310_phy_chan *phy_chan = NULL;
> + struct transfer_desc *tsf_desc = NULL;
> + unsigned int channel_tc_status;
> +
> + phy_chan = &hiedmac->phy_chans[chan_id];
> + chan = phy_chan->serving;
> + if (!chan) {
> + hiedmacv310_error("error interrupt on chan: %d!", chan_id);
> + return 0;
> + }
> + tsf_desc = chan->at;
> +
> + channel_tc_status = hiedmacv310_readl(hiedmac->base + HIEDMAC_INT_TC1_RAW);
> + channel_tc_status = (channel_tc_status >> chan_id) & 0x01;
> + if (channel_tc_status)
> + hiedmacv310_writel(channel_tc_status << chan_id,
> + hiedmac->base + HIEDMAC_INT_TC1_RAW);
> +
> + channel_tc_status = hiedmacv310_readl(hiedmac->base + HIEDMAC_INT_TC2);
> + channel_tc_status = (channel_tc_status >> chan_id) & 0x01;
> + if (channel_tc_status)
> + hiedmacv310_writel(channel_tc_status << chan_id,
> + hiedmac->base + HIEDMAC_INT_TC2_RAW);
> +
> + if ((hiedmacv310_readl(hiedmac->base + HIEDMAC_INT_ERR1) |
> + hiedmacv310_readl(hiedmac->base + HIEDMAC_INT_ERR2) |
> + hiedmacv310_readl(hiedmac->base + HIEDMAC_INT_ERR3)) &
> + (1 << chan_id)) {
> + hiedmacv310_writel(1 << chan_id, hiedmac->base + HIEDMAC_INT_ERR1_RAW);
> + hiedmacv310_writel(1 << chan_id, hiedmac->base + HIEDMAC_INT_ERR2_RAW);
> + hiedmacv310_writel(1 << chan_id, hiedmac->base + HIEDMAC_INT_ERR3_RAW);
> + }
> +
> + spin_lock(&chan->virt_chan.lock);
> +
> + if (tsf_desc->cyclic) {
> + vchan_cyclic_callback(&tsf_desc->virt_desc);
> + spin_unlock(&chan->virt_chan.lock);
> + return 1;
> + }
> + chan->at = NULL;
> + tsf_desc->done = true;
> + vchan_cookie_complete(&tsf_desc->virt_desc);
> +
> + if (vchan_next_desc(&chan->virt_chan))
> + hiedmac_start_next_txd(chan);
> + else
> + hiedmac_phy_free(chan);
> + spin_unlock(&chan->virt_chan.lock);
> + return 1;
> +}
> +
> +static irqreturn_t hiemdacv310_irq(int irq, void *dev)
> +{
> + struct hiedmacv310_driver_data *hiedmac = (struct hiedmacv310_driver_data *)dev;
> + u32 mask = 0;
> + unsigned int channel_status, temp, i;
> +
> + channel_status = hiedmacv310_readl(hiedmac->base + HIEDMAC_INT_STAT);
> + if (!channel_status) {
> + hiedmacv310_error("channel_status = 0x%x", channel_status);
> + return IRQ_NONE;
> + }
> +
> + for (i = 0; i < hiedmac->channels; i++) {
> + temp = (channel_status >> i) & 0x1;
> + if (temp)
> + mask |= handle_irq(hiedmac, i) << i;
> + }
> + return mask ? IRQ_HANDLED : IRQ_NONE;
> +}
> +
> +static inline void hiedmac_dma_slave_init(struct hiedmacv310_dma_chan *chan)
> +{
> + chan->slave = true;
> +}
> +
> +static void hiedmac_desc_free(struct virt_dma_desc *vd)
> +{
> + struct transfer_desc *tsf_desc = to_edmac_transfer_desc(&vd->tx);
> + struct hiedmacv310_dma_chan *edmac_dma_chan = to_edamc_chan(vd->tx.chan);
> +
> + dma_descriptor_unmap(&vd->tx);
> + dma_pool_free(edmac_dma_chan->host->pool, tsf_desc->llis_vaddr, tsf_desc->llis_busaddr);
> + kfree(tsf_desc);
> +}
> +
> +static int hiedmac_init_virt_channels(struct hiedmacv310_driver_data *hiedmac,
> + struct dma_device *dmadev,
> + unsigned int channels, bool slave)
> +{
> + struct hiedmacv310_dma_chan *chan = NULL;
> + int i;
> +
> + INIT_LIST_HEAD(&dmadev->channels);
> + for (i = 0; i < channels; i++) {
> + chan = kzalloc(sizeof(struct hiedmacv310_dma_chan), GFP_KERNEL);
> + if (!chan) {
> + hiedmacv310_error("fail to allocate memory for virt channels!");
> + return -1;
> + }
> +
> + chan->host = hiedmac;
> + chan->state = HIEDMAC_CHAN_IDLE;
> + chan->signal = -1;
> +
> + if (slave) {
> + chan->id = i;
> + hiedmac_dma_slave_init(chan);
> + }
> + chan->virt_chan.desc_free = hiedmac_desc_free;
> + vchan_init(&chan->virt_chan, dmadev);
> + }
> + return 0;
> +}
> +
> +static void hiedmac_free_virt_channels(struct dma_device *dmadev)
> +{
> + struct hiedmacv310_dma_chan *chan = NULL;
> + struct hiedmacv310_dma_chan *next = NULL;
> +
> + list_for_each_entry_safe(chan, next, &dmadev->channels, virt_chan.chan.device_node) {
> + list_del(&chan->virt_chan.chan.device_node);
> + kfree(chan);
> + }
> +}
> +
> +static void hiedmacv310_prep_dma_device(struct platform_device *pdev,
> + struct hiedmacv310_driver_data *hiedmac)
> +{
> + dma_cap_set(DMA_MEMCPY, hiedmac->memcpy.cap_mask);
> + hiedmac->memcpy.dev = &pdev->dev;
> + hiedmac->memcpy.device_free_chan_resources = hiedmac_free_chan_resources;
> + hiedmac->memcpy.device_prep_dma_memcpy = hiedmac_prep_dma_memcpy;
> + hiedmac->memcpy.device_tx_status = hiedmac_tx_status;
> + hiedmac->memcpy.device_issue_pending = hiedmac_issue_pending;
> + hiedmac->memcpy.device_config = hiedmac_config;
> + hiedmac->memcpy.device_pause = hiedmac_pause;
> + hiedmac->memcpy.device_resume = hiedmac_resume;
> + hiedmac->memcpy.device_terminate_all = hiedmac_terminate_all;
> + hiedmac->memcpy.directions = BIT(DMA_MEM_TO_MEM);
> + hiedmac->memcpy.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
> +
> + dma_cap_set(DMA_SLAVE, hiedmac->slave.cap_mask);
> + dma_cap_set(DMA_CYCLIC, hiedmac->slave.cap_mask);
> + hiedmac->slave.dev = &pdev->dev;
> + hiedmac->slave.device_free_chan_resources = hiedmac_free_chan_resources;
> + hiedmac->slave.device_tx_status = hiedmac_tx_status;
> + hiedmac->slave.device_issue_pending = hiedmac_issue_pending;
> + hiedmac->slave.device_prep_slave_sg = hiedmac_prep_slave_sg;
> + hiedmac->slave.device_prep_dma_cyclic = hiedmac_prep_dma_cyclic;
> + hiedmac->slave.device_config = hiedmac_config;
> + hiedmac->slave.device_resume = hiedmac_resume;
> + hiedmac->slave.device_pause = hiedmac_pause;
> + hiedmac->slave.device_terminate_all = hiedmac_terminate_all;
> + hiedmac->slave.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
> + hiedmac->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
> +}
> +
> +static int hiedmacv310_init_chan(struct hiedmacv310_driver_data *hiedmac)
> +{
> + int i, ret;
> +
> + hiedmac->phy_chans = kzalloc((hiedmac->channels * sizeof(
> + struct hiedmacv310_phy_chan)),
> + GFP_KERNEL);
> + if (!hiedmac->phy_chans) {
> + hiedmacv310_error("malloc for phy chans fail!");
> + return -ENOMEM;
> + }
> +
> + for (i = 0; i < hiedmac->channels; i++) {
> + struct hiedmacv310_phy_chan *phy_ch = &hiedmac->phy_chans[i];
> +
> + phy_ch->id = i;
> + phy_ch->base = hiedmac->base + hiedmac_cx_base(i);
> + spin_lock_init(&phy_ch->lock);
> + phy_ch->serving = NULL;
> + }
> +
> + ret = hiedmac_init_virt_channels(hiedmac, &hiedmac->memcpy, hiedmac->channels,
> + false);
> + if (ret) {
> + hiedmacv310_error("fail to init memory virt channels!");
> + goto free_phychans;
> + }
> +
> + ret = hiedmac_init_virt_channels(hiedmac, &hiedmac->slave, hiedmac->slave_requests,
> + true);
> + if (ret) {
> + hiedmacv310_error("fail to init slave virt channels!");
> + goto free_memory_virt_channels;
> + }
> + return 0;
> +
> +free_memory_virt_channels:
> + hiedmac_free_virt_channels(&hiedmac->memcpy);
> +free_phychans:
> + kfree(hiedmac->phy_chans);
> + return -ENOMEM;
> +}
> +
> +static void hiedmacv310_free_chan(struct hiedmacv310_driver_data *hiedmac)
> +{
> + hiedmac_free_virt_channels(&hiedmac->slave);
> + hiedmac_free_virt_channels(&hiedmac->memcpy);
> + kfree(hiedmac->phy_chans);
> +}
> +
> +static void hiedmacv310_prep_phy_device(const struct hiedmacv310_driver_data *hiedmac)
> +{
> + clk_prepare_enable(hiedmac->clk);
> + clk_prepare_enable(hiedmac->axi_clk);
> + reset_control_deassert(hiedmac->rstc);
> +
> + hiedmacv310_writel(HIEDMAC_ALL_CHAN_CLR, hiedmac->base + HIEDMAC_INT_TC1_RAW);
> + hiedmacv310_writel(HIEDMAC_ALL_CHAN_CLR, hiedmac->base + HIEDMAC_INT_TC2_RAW);
> + hiedmacv310_writel(HIEDMAC_ALL_CHAN_CLR, hiedmac->base + HIEDMAC_INT_ERR1_RAW);
> + hiedmacv310_writel(HIEDMAC_ALL_CHAN_CLR, hiedmac->base + HIEDMAC_INT_ERR2_RAW);
> + hiedmacv310_writel(HIEDMAC_ALL_CHAN_CLR, hiedmac->base + HIEDMAC_INT_ERR3_RAW);
> + hiedmacv310_writel(HIEDMAC_INT_ENABLE_ALL_CHAN,
> + hiedmac->base + HIEDMAC_INT_TC1_MASK);
> + hiedmacv310_writel(HIEDMAC_INT_ENABLE_ALL_CHAN,
> + hiedmac->base + HIEDMAC_INT_TC2_MASK);
> + hiedmacv310_writel(HIEDMAC_INT_ENABLE_ALL_CHAN,
> + hiedmac->base + HIEDMAC_INT_ERR1_MASK);
> + hiedmacv310_writel(HIEDMAC_INT_ENABLE_ALL_CHAN,
> + hiedmac->base + HIEDMAC_INT_ERR2_MASK);
> + hiedmacv310_writel(HIEDMAC_INT_ENABLE_ALL_CHAN,
> + hiedmac->base + HIEDMAC_INT_ERR3_MASK);
> +}
> +
> +static struct hiedmacv310_driver_data *hiedmacv310_prep_hiedmac_device(struct platform_device *pdev)
> +{
> + int ret;
> + struct hiedmacv310_driver_data *hiedmac = NULL;
> + ssize_t transfer_size;
> +
> + ret = dma_set_mask_and_coherent(&(pdev->dev), DMA_BIT_MASK(64));
> + if (ret)
> + return NULL;
> +
> + hiedmac = kzalloc(sizeof(*hiedmac), GFP_KERNEL);
> + if (!hiedmac) {
> + hiedmacv310_error("malloc for hiedmac fail!");
> + return NULL;
> + }
> +
> + hiedmac->dev = pdev;
> +
> + ret = get_of_probe(hiedmac);
> + if (ret) {
> + hiedmacv310_error("get dts info fail!");
> + goto free_hiedmac;
> + }
> +
> + hiedmacv310_prep_dma_device(pdev, hiedmac);
> + hiedmac->max_transfer_size = MAX_TRANSFER_BYTES;
> + transfer_size = MAX_TSFR_LLIS * EDMACV300_LLI_WORDS * sizeof(u32);
> +
> + hiedmac->pool = dma_pool_create(DRIVER_NAME, &(pdev->dev),
> + transfer_size, EDMACV300_POOL_ALIGN, 0);
> + if (!hiedmac->pool) {
> + hiedmacv310_error("create pool fail!");
> + goto free_hiedmac;
> + }
> +
> + ret = hiedmacv310_init_chan(hiedmac);
> + if (ret)
> + goto free_pool;
> +
> + return hiedmac;
> +
> +free_pool:
> + dma_pool_destroy(hiedmac->pool);
> +free_hiedmac:
> + kfree(hiedmac);
> + return NULL;
> +}
> +
> +static void free_hiedmac_device(struct hiedmacv310_driver_data *hiedmac)
> +{
> + hiedmacv310_free_chan(hiedmac);
> + dma_pool_destroy(hiedmac->pool);
> + kfree(hiedmac);
> +}
> +
> +static int __init hiedmacv310_probe(struct platform_device *pdev)
> +{
> + int ret;
> + struct hiedmacv310_driver_data *hiedmac = NULL;
> +
> + hiedmac = hiedmacv310_prep_hiedmac_device(pdev);
> + if (hiedmac == NULL)
> + return -ENOMEM;
> +
> + ret = request_irq(hiedmac->irq, hiemdacv310_irq, 0, DRIVER_NAME, hiedmac);
> + if (ret) {
> + hiedmacv310_error("fail to request irq");
> + goto free_hiedmac;
> + }
> + hiedmacv310_prep_phy_device(hiedmac);
> + ret = dma_async_device_register(&hiedmac->memcpy);
> + if (ret) {
> + hiedmacv310_error("%s failed to register memcpy as an async device - %d",
> + __func__, ret);
> + goto free_irq_res;
> + }
> +
> + ret = dma_async_device_register(&hiedmac->slave);
> + if (ret) {
> + hiedmacv310_error("%s failed to register slave as an async device - %d",
> + __func__, ret);
> + goto free_memcpy_device;
> + }
> + return 0;
> +
> +free_memcpy_device:
> + dma_async_device_unregister(&hiedmac->memcpy);
> +free_irq_res:
> + free_irq(hiedmac->irq, hiedmac);
> +free_hiedmac:
> + free_hiedmac_device(hiedmac);
> + return -ENOMEM;
> +}
> +
> +static int hiemda_remove(struct platform_device *pdev)
> +{
> + int err = 0;
> + return err;
> +}
> +
> +static const struct of_device_id hiedmacv310_match[] = {
> + { .compatible = "hisilicon,hiedmacv310" },
> + {},
> +};
> +
> +static struct platform_driver hiedmacv310_driver = {
> + .remove = hiemda_remove,
> + .driver = {
> + .name = "hiedmacv310",
> + .of_match_table = hiedmacv310_match,
> + },
> +};
> +
> +static int __init hiedmacv310_init(void)
> +{
> + return platform_driver_probe(&hiedmacv310_driver, hiedmacv310_probe);
> +}
> +subsys_initcall(hiedmacv310_init);
> +
> +static void __exit hiedmacv310_exit(void)
> +{
> + platform_driver_unregister(&hiedmacv310_driver);
> +}
> +module_exit(hiedmacv310_exit);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Hisilicon");
> diff --git a/drivers/dma/hiedmacv310.h b/drivers/dma/hiedmacv310.h
> new file mode 100644
> index 000000000000..99e1720263e3
> --- /dev/null
> +++ b/drivers/dma/hiedmacv310.h
> @@ -0,0 +1,136 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * The Hiedma Controller v310 Device Driver for HiSilicon
> + *
> + * Copyright (c) 2019-2020, Huawei Tech. Co., Ltd.
> + *
> + * Author: Dongjiu Geng <gengdongjiu@...wei.com>
> + */
> +#ifndef __HIEDMACV310_H__
> +#define __HIEDMACV310_H__
> +
> +/* debug control */
> +#define HIEDMACV310_CONFIG_TRACE_LEVEL 3
> +#define HIEDMACV310_TRACE_LEVEL 0
> +#define HIEDMACV310_REG_TRACE_LEVEL 3
> +
> +#ifdef DEBUG_HIEDMAC
> +#define hiedmacv310_trace(level, msg, a...) do { \
> + if ((level) >= HIEDMACV310_TRACE_LEVEL) { \
> + pr_info("%s: %d: " msg, __func__, __LINE__, ## a); \
> + } \
> +} while (0)
> +
> +#define hiedmacv310_assert(cond) do { \
> + if (!(cond)) { \
> + pr_info("Assert:hiedmacv310:%s:%d\n", \
> + __func__, \
> + __LINE__); \
> + __WARN(); \
> + } \
> +} while (0)
> +
> +#define hiedmacv310_error(s, a...) \
> + pr_err("hiedmacv310:%s:%d: " s, __func__, __LINE__, ## a)
> +
> +#define hiedmacv310_info(s, a...) \
> + pr_info("hiedmacv310:%s:%d: " s, __func__, __LINE__, ## a)
> +
> +#else
> +
> +#define hiedmacv310_trace(level, msg, a...)
> +#define hiedmacv310_assert(cond)
> +#define hiedmacv310_error(s, a...)
> +
> +#endif
> +
> +
> +#define hiedmacv310_readl(addr) ((unsigned int)readl((void *)(addr)))
> +
> +#define hiedmacv310_writel(v, addr) writel(v, (void *)(addr))
> +
> +
> +#define MAX_TRANSFER_BYTES 0xffff
> +
> +/* reg offset */
> +#define HIEDMAC_INT_STAT 0x0
> +#define HIEDMAC_INT_TC1 0x4
> +#define HIEDMAC_INT_TC2 0x8
> +#define HIEDMAC_INT_ERR1 0xc
> +#define HIEDMAC_INT_ERR2 0x10
> +#define HIEDMAC_INT_ERR3 0x14
> +
> +#define HIEDMAC_INT_TC1_MASK 0x18
> +#define HIEDMAC_INT_TC2_MASK 0x1c
> +#define HIEDMAC_INT_ERR1_MASK 0x20
> +#define HIEDMAC_INT_ERR2_MASK 0x24
> +#define HIEDMAC_INT_ERR3_MASK 0x28
> +
> +#define HIEDMAC_INT_TC1_RAW 0x600
> +#define HIEDMAC_INT_TC2_RAW 0x608
> +#define HIEDMAC_INT_ERR1_RAW 0x610
> +#define HIEDMAC_INT_ERR2_RAW 0x618
> +#define HIEDMAC_INT_ERR3_RAW 0x620
> +
> +#define hiedmac_cx_curr_cnt0(cn) (0x404 + (cn) * 0x20)
> +#define hiedmac_cx_curr_src_addr_l(cn) (0x408 + (cn) * 0x20)
> +#define hiedmac_cx_curr_src_addr_h(cn) (0x40c + (cn) * 0x20)
> +#define hiedmac_cx_curr_dest_addr_l(cn) (0x410 + (cn) * 0x20)
> +#define hiedmac_cx_curr_dest_addr_h(cn) (0x414 + (cn) * 0x20)
> +
> +#define HIEDMAC_CH_PRI 0x688
> +#define HIEDMAC_CH_STAT 0x690
> +#define HIEDMAC_DMA_CTRL 0x698
> +
> +#define hiedmac_cx_base(cn) (0x800 + (cn) * 0x40)
> +#define hiedmac_cx_lli_l(cn) (0x800 + (cn) * 0x40)
> +#define hiedmac_cx_lli_h(cn) (0x804 + (cn) * 0x40)
> +#define hiedmac_cx_cnt0(cn) (0x81c + (cn) * 0x40)
> +#define hiedmac_cx_src_addr_l(cn) (0x820 + (cn) * 0x40)
> +#define hiedmac_cx_src_addr_h(cn) (0x824 + (cn) * 0x40)
> +#define hiedmac_cx_dest_addr_l(cn) (0x828 + (cn) * 0x40)
> +#define hiedmac_cx_dest_addr_h(cn) (0x82c + (cn) * 0x40)
> +#define hiedmac_cx_config(cn) (0x830 + (cn) * 0x40)
> +
> +#define HIEDMAC_ALL_CHAN_CLR 0xff
> +#define HIEDMAC_INT_ENABLE_ALL_CHAN 0xff
> +
> +
> +#define HIEDMAC_CONFIG_SRC_INC (1 << 31)
> +#define HIEDMAC_CONFIG_DST_INC (1 << 30)
GENMASK() ?
> +
> +#define HIEDMAC_CONFIG_SRC_WIDTH_SHIFT 16
> +#define HIEDMAC_CONFIG_DST_WIDTH_SHIFT 12
> +#define HIEDMAC_WIDTH_8BIT 0b0
> +#define HIEDMAC_WIDTH_16BIT 0b1
> +#define HIEDMAC_WIDTH_32BIT 0b10
> +#define HIEDMAC_WIDTH_64BIT 0b11
BIT() or GENMASK()
> +#ifdef CONFIG_64BIT
> +#define HIEDMAC_MEM_BIT_WIDTH HIEDMAC_WIDTH_64BIT
> +#else
> +#define HIEDMAC_MEM_BIT_WIDTH HIEDMAC_WIDTH_32BIT
> +#endif
> +
> +#define HIEDMAC_MAX_BURST_WIDTH 16
> +#define HIEDMAC_MIN_BURST_WIDTH 1
> +#define HIEDMAC_CONFIG_SRC_BURST_SHIFT 24
> +#define HIEDMAC_CONFIG_DST_BURST_SHIFT 20
> +
> +#define HIEDMAC_LLI_ALIGN 0x40
> +#define HIEDMAC_LLI_DISABLE 0x0
> +#define HIEDMAC_LLI_ENABLE 0x2
> +
> +#define HIEDMAC_CXCONFIG_SIGNAL_SHIFT 0x4
Dont use shift, define the bitmask and use helpers in include/linux/bitfield.h
--
~Vinod
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