This patch adds a driver for HiSilicon Ascend SDMA engine.
The DMA controller can do transfers between device and memory
or memory to memory. Currently, the controller only support
single copy. Drives can pass a substreamid to the DMA engine,
which will enable transfers in user-space addresses.
Signed-off-by: Guo Mengqi <guomengqi3@xxxxxxxxxx>
---
drivers/dma/Kconfig | 9 +
drivers/dma/Makefile | 1 +
drivers/dma/hisi-ascend-sdma.c | 810 +++++++++++++++++++++++++++++++++
3 files changed, 820 insertions(+)
create mode 100644 drivers/dma/hisi-ascend-sdma.c
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 4ccae1a3b884..afc2b648dcd2 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -244,6 +244,15 @@ config FSL_RAID
the capability to offload memcpy, xor and pq computation
for raid5/6.
+config HISI_ASCEND_SDMA
+ tristate "HiSilicon Ascend SDMA Engine support"
+ depends on ARCH_HISI && ARM64
+ depends on IOMMU_API && OF
+ select DMA_ENGINE
+ select DMA_VIRTUAL_CHANNELS
+ help
+ Enable support for HiSilicon Ascend SDMA engine.
+
config HISI_DMA
tristate "HiSilicon DMA Engine support"
depends on ARCH_HISI || COMPILE_TEST
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index 83553a97a010..0b736c54407b 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -82,6 +82,7 @@ obj-$(CONFIG_XGENE_DMA) += xgene-dma.o
obj-$(CONFIG_ST_FDMA) += st_fdma.o
obj-$(CONFIG_FSL_DPAA2_QDMA) += fsl-dpaa2-qdma/
obj-$(CONFIG_INTEL_LDMA) += lgm/
+obj-$(CONFIG_HISI_ASCEND_SDMA) += hisi-ascend-sdma.o
obj-y += mediatek/
obj-y += qcom/
diff --git a/drivers/dma/hisi-ascend-sdma.c b/drivers/dma/hisi-ascend-sdma.c
new file mode 100644
index 000000000000..6df52b9d47ac
--- /dev/null
+++ b/drivers/dma/hisi-ascend-sdma.c
@@ -0,0 +1,810 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright(c) 2019-2022 HiSilicon Limited. */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/dmaengine.h>
+#include <linux/slab.h>
+#include "virt-dma.h"
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/iommu.h>
+
+/* SDMA_CH_REGS */
+#define SDMAM_CH_CTRL_REG 0x0000
+#define SDMAM_CH_IIDR_REG 0x0004
+#define SDMAM_CH_TYPER_REG 0x0008
+#define SDMAM_CH_BYPASS_CTRL_REG 0x0014
+
+#define SDMAM_IRQ_STATUS_REG 0x000c
+#define SDMAM_IRQ_CTRL_REG 0x0010
+#define SDMAM_IRQ_IOC_MASK (1U << 16)
+#define SDMAM_IRQ_IOE_MASK (1U << 17)
+#define SDMAM_IRQ_ERR_MASK (0xFFU << 20)
+
+#define SDMAM_CH_SQBASER_L_REG 0x0040
+#define SDMAM_CH_SQBASER_H_REG 0x0044
+#define SDMAM_CH_SQ_ATTR_REG 0x0048
+#define SDMAM_CH_SQTDBR_REG 0x004c
+#define SDMAM_CH_SQHDBR_REG 0x0050
+
+#define SDMAM_CH_CQBASER_L_REG 0x0080
+#define SDMAM_CH_CQBASER_H_REG 0x0084
+#define SDMAM_CH_CQ_ATTR_REG 0X0088
+#define SDMAM_CH_CQTDBR_REG 0x008c
+#define SDMAM_CH_CQHDBR_REG 0x0090
+
+/* SDMA_COMMON_REGS */
+#define SDMA_COMMON_DMA_AXUSER_REG0 0x0FE0
+#define SDMA_COMMON_DMA_AXUSER_REG1 0x0FE4
+#define SDMA_COMMON_DMA_AXUSER_REG2 0x0FE8
+#define SDMA_DFX_FEATURE_EN_REG 0x0FFC
+
+#define SDMA_IOMEM_SIZE 0x10000
+#define SDMA_CHANNEL_IOMEM_SIZE 0x1000
+
+#define SDMA_SQ_ENTRY_SIZE 32UL
+#define SDMA_CQ_ENTRY_SIZE 16UL
+
+/* must be pow of 2 */
+#define SDMA_SQ_LENGTH (1U << 10)
+#define SDMA_CQ_LENGTH (1U << 10)
+#define SDMA_SQ_SIZE (SDMA_SQ_ENTRY_SIZE * SDMA_SQ_LENGTH)
+#define SDMA_CQ_SIZE (SDMA_CQ_ENTRY_SIZE * SDMA_CQ_LENGTH)
+
+#define SDMA_MAX_COPY_SIZE 0x100000000UL
+#define SDMA_COPY_SIZE_MASK 0xFFFFFFFFUL
+
+#define SDMA_MAX_CHANNEL_NUM 64
+
+/*
+ * struct ascend_sdma_chip_data - Ascend chip specific data
+ * @channel_iomem_size: Size of channel register space
+ */
+struct ascend_sdma_chip_data {
+ unsigned int channel_iomem_size;
+};
+
+void set_sdma_channel_info(struct dma_chan *c, int pasid);
+
+static u32 sdma_queue_count(u32 head, u32 tail, u32 len)
+{
+ return (tail - head) & (len - 1);
+}
+
+static int iommu_enabled;
+
+struct sdma_sq_entry {
+ u32 opcode : 8;
+ u32 ie : 1;
+ u32 sssv : 1;
+ u32 dssv : 1;
+ u32 sns : 1;
+ u32 dns : 1;
+ u32 qos : 4;
+ u32 sro : 1;
+ u32 dro : 1;
+ u32 partid : 4;
+ u32 mpamns : 1;
+ u32 reserved0 : 8;
+ u32 src_streamid : 16;
+ u32 src_substreamid : 16;
+ u32 dst_streamid : 16;
+ u32 dst_substreamid : 16;
+ u32 length;
+ union {
+ u64 src_addr;
+ struct {
+ u32 src_addr_l;
+ u32 src_addr_h;
+ };
+ };
+ union {
+ u64 dst_addr;
+ struct {
+ u32 dst_addr_l;
+ u32 dst_addr_h;
+ };
+ };
+};
+
+struct sdma_cq_entry {
+ u32 reserved1;
+ u32 reserved2;
+ u32 sqhd : 16;
+ u32 reserved3 : 16;
+ u32 reserved4 : 16;
+ u32 vld : 1;
+ u32 status : 15;
+};
+
+/*
+ * struct sdma_desc - sdma descriptor to manage transfer requests.
+ */
+struct sdma_desc {
+ int pasid;
+ struct virt_dma_desc vd;
+ struct sdma_sq_entry entry;
+};
+
+/*
+ * struct sdma_chan - sdma channel information
+ */
+struct sdma_chan {
+ u16 idx;
+ u16 cq_vld;
+
+ u16 sq_head;
+ u16 sq_tail;
+ u16 cq_head;
+ u16 cq_tail;
+
+ /* must be page-aligned and continuous physical memory */
+ struct sdma_sq_entry *sq_base;
+ struct sdma_cq_entry *cq_base;
+
+ /* used for discrete copy, pre-alloc the buffer, reserved for now */
+ unsigned long *src_addr;
+ unsigned long *dst_addr;
+ unsigned long *len;
+
+ void __iomem *io_base;
+
+ int id;
+ struct virt_dma_chan vc;
+ struct sdma_dev *sdev;
+
+ struct sdma_desc *desc;
+ char *name;
+ int pasid;
+};
+
+#define SDMA_DEVICE_NAME_LENGTH_MAX 20
+/*
+ * struct sdma_dev - sdma controller information
+ */
+struct sdma_dev {
+ struct dma_device dma_dev;
+ struct device *dev;
+ void __iomem *io_base;
+
+ u16 idx;
+ u16 nr_channel;
+ DECLARE_BITMAP(channel_map, SDMA_MAX_CHANNEL_NUM);
+ u32 streamid;
+
+ const struct ascend_sdma_chip_data *cdata;
+
+ char name[SDMA_DEVICE_NAME_LENGTH_MAX];
+ struct sdma_chan *channels;
+};
+
+static inline struct sdma_chan *to_sdma_chan(struct dma_chan *c)
+{
+ return container_of(c, struct sdma_chan, vc.chan);
+}
+
+static inline struct sdma_desc *to_sdma_desc(struct virt_dma_desc *vd)
+{
+ return container_of(vd, struct sdma_desc, vd);
+}
+
+/* sdma supports sva transfer via iommu.
+ * client must first set the pasid.
+ */
+void set_sdma_channel_info(struct dma_chan *c, int pasid)
+{
+ struct sdma_chan *sc = to_sdma_chan(c);
+
+ sc->pasid = pasid;
+}
+EXPORT_SYMBOL_GPL(set_sdma_channel_info);
+
+struct sdma_hardware_info {
+ unsigned long channel_map;
+ u64 base_addr; /* physical address */
+};
+
+static int of_sdma_collect_info(struct platform_device *pdev, struct sdma_hardware_info *info)
+{
+ int ret;
+ u32 chan_mask[2] = {0};
+ struct resource res;
+ struct device *dev = &pdev->dev;
+ struct device_node *np = pdev->dev.of_node;
+
+ ret = of_property_read_variable_u32_array(np, "dma-channel-mask",
+ chan_mask, 1, 2);
+ if (ret < 0) {
+ dev_err(dev, "get dma channel mask from dtb failed, %d\n", ret);
+ return ret;
+ }
+ bitmap_from_arr32(&info->channel_map, chan_mask, SDMA_MAX_CHANNEL_NUM);
+
+ ret = of_address_to_resource(np, 0, &res);
+ if (ret < 0) {
+ dev_err(dev, "get io_base info from dtb failed, %d\n", ret);
+ return ret;
+ }
+
+ info->base_addr = res.start;
+ if (resource_size(&res) != SDMA_IOMEM_SIZE)
+ dev_warn(dev, "reg size %#llx check failed, use %#x\n",
+ resource_size(&res), SDMA_IOMEM_SIZE);
+
+ return 0;
+}
+
+static int sdma_channel_alloc_sq_cq(struct sdma_chan *sc)
+{
+ unsigned long *buf;
+ struct device *dev = sc->sdev->dev;
+
+ sc->sq_base = (struct sdma_sq_entry *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
+ get_order(SDMA_SQ_SIZE));
+ if (!sc->sq_base) {
+ dev_err(dev, "channel%d: alloc sq_memory failed\n", sc->idx);
+ return -ENOMEM;
+ }
+
+ sc->cq_base = (struct sdma_cq_entry *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
+ get_order(SDMA_CQ_SIZE));
+ if (!sc->cq_base) {
+ dev_err(dev, "channel%d: alloc cq_memory failed\n", sc->idx);
+ free_pages((unsigned long)sc->sq_base, get_order(SDMA_SQ_SIZE));
+ return -ENOMEM;
+ }
+
+ buf = vmalloc(sizeof(unsigned long) * SDMA_SQ_LENGTH * 3);
+ if (!buf) {
+ dev_err(dev, "channel%d: alloc user_buf failed\n", sc->idx);
+ free_pages((unsigned long)sc->sq_base, get_order(SDMA_SQ_SIZE));
+ free_pages((unsigned long)sc->cq_base, get_order(SDMA_CQ_SIZE));
+ return -ENOMEM;
+ }
+ sc->src_addr = buf;
+ sc->dst_addr = buf + SDMA_SQ_LENGTH;
+ sc->len = buf + SDMA_SQ_LENGTH * 2;
+
+ return 0;
+}
+
+static void sdma_free_all_sq_cq(struct sdma_dev *sdev)
+{
+ int i;
+ struct sdma_chan *sc;
+
+ for (i = sdev->nr_channel - 1; i >= 0; i--) {
+ sc = sdev->channels + i;
+ free_pages((unsigned long)sc->sq_base, get_order(SDMA_SQ_SIZE));
+ free_pages((unsigned long)sc->cq_base, get_order(SDMA_CQ_SIZE));
+ vfree(sc->src_addr);
+ }
+}
+
+static void sdma_channel_set_val_mask_shift(struct sdma_chan *sc,
+ int reg, u32 val, u32 mask, u32 shift)
+{
+ u32 reg_val = readl(sc->io_base + reg);
+
+ reg_val = (reg_val & ~(mask << shift)) | ((val & mask) << shift);
+ writel(reg_val, sc->io_base + reg);
+}
+
+static u32 sdma_channel_get_val_mask_shift(struct sdma_chan *sc,
+ int reg, u32 mask, u32 shift)
+{
+ u32 reg_val = readl(sc->io_base + reg);
+
+ return (reg_val >> shift) & mask;
+}
+
+static void sdma_channel_set_pause(struct sdma_chan *sc)
+{
+ sdma_channel_set_val_mask_shift(sc, SDMAM_CH_CTRL_REG, 1, 1, 1);
+}
+
+static bool sdma_channel_is_paused(struct sdma_chan *sc)
+{
+ return sdma_channel_get_val_mask_shift(sc, SDMAM_CH_CTRL_REG, 0xF, 16) == 3;
+}
+
+static bool sdma_channel_is_idle(struct sdma_chan *sc)
+{
+ return sdma_channel_get_val_mask_shift(sc, SDMAM_CH_CTRL_REG, 0xF, 16) == 0;
+}
+
+static bool sdma_channel_is_quiescent(struct sdma_chan *sc)
+{
+ return sdma_channel_get_val_mask_shift(sc, SDMAM_CH_CTRL_REG, 1, 31) == 1;
+}
+
+static void sdma_channel_write_reset(struct sdma_chan *sc)
+{
+ sdma_channel_set_val_mask_shift(sc, SDMAM_CH_CTRL_REG, 1, 1, 3);
+}
+
+static void sdma_channel_enable(struct sdma_chan *sc)
+{
+ sdma_channel_set_val_mask_shift(sc, SDMAM_CH_CTRL_REG, 1, 1, 0);
+}
+
+static void sdma_channel_set_doorbell_mode(struct sdma_chan *sc)
+{
+ sdma_channel_set_val_mask_shift(sc, SDMAM_CH_CTRL_REG, 0, 1, 9);
+}
+
+static void sdma_channel_disable(struct sdma_chan *sc)
+{
+ sdma_channel_set_val_mask_shift(sc, SDMAM_CH_CTRL_REG, 0, 1, 0);
+}
+
+static void sdma_channel_set_sq_size(struct sdma_chan *sc, u32 size)
+{
+ sdma_channel_set_val_mask_shift(sc, SDMAM_CH_SQ_ATTR_REG, size, 0xFFFF, 0);
+}
+
+static void sdma_channel_set_cq_size(struct sdma_chan *sc, u32 size)
+{
+ sdma_channel_set_val_mask_shift(sc, SDMAM_CH_CQ_ATTR_REG, size, 0xFFFF, 0);
+}
+
+static void sdma_channel_set_sq_tail(struct sdma_chan *sc, u32 val)
+{
+ sdma_channel_set_val_mask_shift(sc, SDMAM_CH_SQTDBR_REG, val, 0xFFFF, 0);
+}
+
+static u32 sdma_channel_get_sq_head(struct sdma_chan *sc)
+{
+ return sdma_channel_get_val_mask_shift(sc, SDMAM_CH_SQHDBR_REG, 0xFFFF, 0);
+}
+
+static void sdma_channel_set_cq_head(struct sdma_chan *sc, u32 val)
+{
+ sdma_channel_set_val_mask_shift(sc, SDMAM_CH_CQHDBR_REG, val, 0xFFFF, 0);
+}
+
+static u32 sdma_channel_get_cq_tail(struct sdma_chan *sc)
+{
+ return sdma_channel_get_val_mask_shift(sc, SDMAM_CH_CQTDBR_REG, 0xFFFF, 0);
+}
+
+static void sdma_channel_init(struct sdma_chan *sc)
+{
+ void __iomem *io_base = sc->io_base;
+ u64 sq_addr = virt_to_phys(sc->sq_base);
+ u64 cq_addr = virt_to_phys(sc->cq_base);
+
+ writel(sq_addr & 0xFFFFFFFF, io_base + SDMAM_CH_SQBASER_L_REG);
+ writel(sq_addr >> 32, io_base + SDMAM_CH_SQBASER_H_REG);
+ writel(cq_addr & 0xFFFFFFFF, io_base + SDMAM_CH_CQBASER_L_REG);
+ writel(cq_addr >> 32, io_base + SDMAM_CH_CQBASER_H_REG);
+
+ sdma_channel_set_sq_size(sc, SDMA_SQ_LENGTH - 1);
+ sdma_channel_set_cq_size(sc, SDMA_CQ_LENGTH - 1);
+ sdma_channel_set_sq_tail(sc, 0);
+ sdma_channel_set_cq_head(sc, 0);
+
+ sc->cq_vld = 1;
+ sdma_channel_set_doorbell_mode(sc);
+ sdma_channel_enable(sc);
+}
+
+static void sdma_channel_reset(struct sdma_chan *sc)
+{
+ int i = 0;
+ struct device *dev = sc->sdev->dev;
+
+ sdma_channel_set_pause(sc);
+ while (!sdma_channel_is_paused(sc))
+ if (++i > 10) {
+ dev_warn(dev, "the channel cannot get paused\n");
+ break;
+ }
+
+ i = 0;
+ while (!sdma_channel_is_quiescent(sc))
+ if (++i > 10) {
+ dev_warn(dev, "the channel cannot get quiescent\n");
+ break;
+ }
+
+ i = 0;
+ sdma_channel_write_reset(sc);
+ while (!sdma_channel_is_idle(sc))
+ if (++i > 10) {
+ dev_warn(dev, "the channel cannot get idle\n");
+ break;
+ }
+ sdma_channel_disable(sc);
+
+ sc->sq_head = sc->sq_tail = sc->cq_head = sc->cq_tail = 0;
+ sdma_channel_init(sc);
+}
+
+static void sdma_destroy_channels(struct sdma_dev *sdev)
+{
+ sdma_free_all_sq_cq(sdev);
+}
+
+static void sdma_desc_free(struct virt_dma_desc *vd)
+{
+ kfree(to_sdma_desc(vd));
+}
+
+static int sdma_init_channels(struct sdma_dev *sdev, struct sdma_hardware_info *info)
+{
+ int ret = 0;
+ int i, nr_channel;
+ struct sdma_chan *sc;
+ struct device *dev = sdev->dev;
+
+ nr_channel = bitmap_weight(&info->channel_map, BITS_PER_LONG);
+
+ if (!nr_channel || nr_channel > SDMA_MAX_CHANNEL_NUM) {
+ dev_err(dev, "channel count (%d) invalid\n", nr_channel);
+ return -ENODEV;
+ }
+
+ sdev->channels = devm_kcalloc(dev, nr_channel, sizeof(*sdev->channels),
+ GFP_KERNEL);
+ if (!sdev->channels)
+ return -ENOMEM;
+
+ sdev->nr_channel = 0;
+ for (i = 0; sdev->nr_channel < nr_channel; i++) {
+ if (!(info->channel_map & (1UL << i)))
+ continue;
+
+ sc = sdev->channels + sdev->nr_channel;
+ sc->idx = sdev->nr_channel;
+ sc->sdev = sdev;
+ sc->name = devm_kasprintf(dev, GFP_KERNEL, "%s chan%d",
+ dev_name(dev), i);
+
+ ret = sdma_channel_alloc_sq_cq(sc);
+ if (ret < 0)
+ goto err_out;
+
+ sdev->nr_channel++;
+ sc->io_base = sdev->io_base + i * sdev->cdata->channel_iomem_size;
+ vchan_init(&sc->vc, &sdev->dma_dev);
+ sc->vc.desc_free = sdma_desc_free;
+
+ sdma_channel_disable(sc);
+ sdma_channel_init(sc);
+
+ dev_info(dev, "hardware channel%d probed, idx %d\n", i, sc->idx);
+ }
+
+ bitmap_set(sdev->channel_map, 0, sdev->nr_channel);
+
+ return 0;
+
+err_out:
+ sdma_destroy_channels(sdev);
+
+ return ret;
+}
+
+static struct dma_async_tx_descriptor *sdma_prep_dma_memcpy(
+ struct dma_chan *chan, dma_addr_t dst, dma_addr_t src,
+ size_t len, unsigned long flags)
+{
+ struct sdma_chan *sc = to_sdma_chan(chan);
+ struct sdma_desc *d;
+
+ d = kzalloc(sizeof(*d), GFP_NOWAIT);
+ if (!d)
+ return NULL;
+
+ if (sc->pasid > 0)
+ d->pasid = sc->pasid;
+
+ d->entry.src_addr = src;
+ d->entry.dst_addr = dst;
+ d->entry.length = len;
+
+ return vchan_tx_prep(&sc->vc, &d->vd, flags);
+}
+
+static void sdma_error_handle(struct sdma_chan *sc)
+{
+ u32 cq_tail = sdma_channel_get_cq_tail(sc);
+
+ if (cq_tail < sc->cq_head)
+ sc->cq_vld ^= 1;
+ sc->cq_head = sc->cq_tail = cq_tail;
+ sc->sq_head = sdma_channel_get_sq_head(sc);
+}
+
+static int sdma_terminate_all(struct dma_chan *chan)
+{
+ sdma_error_handle(to_sdma_chan(chan));
+ sdma_channel_reset(to_sdma_chan(chan));
+
+ return 0;
+}
+
+static void sdma_synchronize(struct dma_chan *chan)
+{
+ struct sdma_chan *sc = to_sdma_chan(chan);
+
+ vchan_synchronize(&sc->vc);
+}
+
+static enum dma_status sdma_tx_status(struct dma_chan *chan,
+ dma_cookie_t cookie,
+ struct dma_tx_state *txstate)
+{
+ u32 cq_head, cq_tail, cq_count;
+ u32 irq_reg, ch_ctrl_reg;
+ struct sdma_cq_entry *cq_entry;
+ struct sdma_chan *sc = to_sdma_chan(chan);
+ struct device *dev = sc->sdev->dev;
+ enum dma_status ret = DMA_IN_PROGRESS;
+
+ dsb(sy);
+ irq_reg = readl(sc->io_base + SDMAM_IRQ_STATUS_REG);
+ ch_ctrl_reg = readl(sc->io_base + SDMAM_CH_CTRL_REG);
+
+ if (irq_reg & SDMAM_IRQ_IOC_MASK) {
+ writel(irq_reg, sc->io_base + SDMAM_IRQ_STATUS_REG);
+
+ cq_head = sc->cq_head;
+ cq_tail = sdma_channel_get_cq_tail(sc);
+ cq_count = sdma_queue_count(cq_head, cq_tail, SDMA_CQ_LENGTH);
+ if (!cq_count) {
+ dev_err(dev, "unexpected complete irq\n");
+ ret = DMA_ERROR;
+ goto out;
+ }
+
+ for (; cq_count; cq_count--) {
+ cq_entry = sc->cq_base + cq_head;
+ if (cq_entry->vld != sc->cq_vld || cq_entry->status) {
+ dev_err(dev, "cq_entry invalid, vld: %u, cq_vld: %u, status: %u\n",
+ cq_entry->vld, sc->cq_vld, cq_entry->status);
+ ret = DMA_ERROR;
+ }
+ if (++cq_head == SDMA_CQ_LENGTH) {
+ sc->cq_vld ^= 1;
+ cq_head = 0;
+ }
+ }
+
+ sc->cq_head = cq_head;
+ sdma_channel_set_cq_head(sc, cq_head);
+ sc->sq_head = sdma_channel_get_sq_head(sc);
+ sc->cq_tail = cq_tail;
+
+ if (ret != DMA_ERROR) {
+ ret = DMA_COMPLETE;
+ vchan_cookie_complete(&sc->desc->vd);
+ }
+ } else if (irq_reg & SDMAM_IRQ_IOE_MASK) {
+ writel(irq_reg, sc->io_base + SDMAM_IRQ_STATUS_REG);
+ dev_err(dev, "sdma ioe interrupt occur, status: %#x\n", irq_reg);
+ sdma_error_handle(sc);
+
+ ret = DMA_ERROR;
+ }
+
+out:
+ return ret;
+}
+
+static void sdma_start_transfer(struct sdma_chan *sc)
+{
+ u16 sq_tail = sc->sq_tail;
+ struct sdma_sq_entry *entry = sc->sq_base + sq_tail;
+ struct sdma_desc *desc;
+ struct virt_dma_desc *vd;
+
+ vd = vchan_next_desc(&sc->vc);
+ if (!vd) {
+ sc->desc = NULL;
+ return;
+ }
+ list_del(&vd->node);
+ desc = to_sdma_desc(vd);
+ sc->desc = desc;
+
+ memcpy(entry, &desc->entry, sizeof(struct sdma_sq_entry));
+
+ entry->src_streamid = sc->sdev->streamid;
+ entry->dst_streamid = sc->sdev->streamid;
+
+ entry->sns = 1;
+ entry->dns = 1;
+ entry->ie = 0;
+ entry->partid = 0;
+ entry->mpamns = 1;
+ if (sc->pasid) {
+ entry->sssv = 1;
+ entry->dssv = 1;
+ entry->src_substreamid = sc->pasid;
+ entry->dst_substreamid = sc->pasid;
+ } else {
+ entry->sssv = 0;
+ entry->dssv = 0;
+ }
+ sq_tail = (sq_tail + 1) & (SDMA_SQ_LENGTH - 1);
+ entry->ie = 1;
+
+ dmb(sy);
+ sdma_channel_set_sq_tail(sc, sq_tail);
+ sc->sq_tail = sq_tail;
+}
+
+static void sdma_issue_pending(struct dma_chan *chan)
+{
+ struct sdma_chan *sc = to_sdma_chan(chan);
+ unsigned long flags;
+
+ spin_lock_irqsave(&sc->vc.lock, flags);
+
+ if (vchan_issue_pending(&sc->vc) && !sc->desc)
+ sdma_start_transfer(sc);
+
+ spin_unlock_irqrestore(&sc->vc.lock, flags);
+}
+
+static void sdma_free_chan_resources(struct dma_chan *chan)
+{
+ struct sdma_chan *sc = to_sdma_chan(chan);
+
+ sc->desc = NULL;
+ sc->pasid = 0;
+}
+
+#define SDMA_BUSWIDTHS 1024
+static void sdma_init_dma_device(struct dma_device *dma_dev, struct device *dev)
+{
+ dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
+
+ dma_dev->device_issue_pending = sdma_issue_pending;
+ dma_dev->device_tx_status = sdma_tx_status;
+ dma_dev->device_terminate_all = sdma_terminate_all;
+ dma_dev->device_synchronize = sdma_synchronize;
+ dma_dev->device_free_chan_resources = sdma_free_chan_resources;
+ dma_dev->device_prep_dma_memcpy = sdma_prep_dma_memcpy;
+
+ dma_dev->dev = dev;
+
+ INIT_LIST_HEAD(&dma_dev->channels);
+}
+
+static void sdma_enable_iommu(struct device *dev)
+{
+ int ret;
+
+ ret = iommu_dev_enable_feature(dev, IOMMU_DEV_FEAT_IOPF);
+ if (ret < 0) {
+ dev_warn(dev, "iommu failed to init iopf, err %d\n", ret);
+ return;
+ }
+
+ ret = iommu_dev_enable_feature(dev, IOMMU_DEV_FEAT_SVA);
+ if (ret < 0) {
+ dev_warn(dev, "iommu failed to init sva, err %d\n", ret);
+ iommu_dev_disable_feature(dev, IOMMU_DEV_FEAT_IOPF);
+ return;
+ }
+
+ iommu_enabled = 1;
+}
+
+static void sdma_disable_iommu(struct device *dev)
+{
+ if (!iommu_enabled)
+ return;
+
+ iommu_dev_disable_feature(dev, IOMMU_DEV_FEAT_SVA);
+ iommu_dev_disable_feature(dev, IOMMU_DEV_FEAT_IOPF);
+ iommu_enabled = 0;
+}
+
+static int sdma_device_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct device *dev = &pdev->dev;
+ struct sdma_dev *sdev;
+ struct sdma_hardware_info info;
+ const struct ascend_sdma_chip_data *cdata;
+
+ /* In case iommu uninitialized yet */
+ if (!dev->bus->iommu_ops)
+ return dev_err_probe(dev, -EPROBE_DEFER, "defer probe sdma device\n");
+
+ cdata = of_device_get_match_data(dev);
+ if (!cdata)
+ return dev_err_probe(dev, -ENODEV, "device match data not found\n");
+
+ sdev = devm_kzalloc(dev, sizeof(*sdev), GFP_KERNEL);
+ if (!sdev)
+ return dev_err_probe(dev, -ENOMEM, "alloc sdma_device failed\n");
+ sdev->dev = dev;
+ sdev->cdata = cdata;
+ platform_set_drvdata(pdev, sdev);
+
+ ret = of_sdma_collect_info(pdev, &info);
+ if (ret < 0)
+ return dev_err_probe(dev, ret, "collect device info failed\n");
+
+ sdev->io_base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(sdev->io_base))
+ return dev_err_probe(dev, PTR_ERR(sdev->io_base), "ioremap failed\n");
+
+ /* Fill in dmaengine */
+ sdma_init_dma_device(&sdev->dma_dev, dev);
+
+ sdma_enable_iommu(dev);
+ sdev->streamid = dev->iommu->fwspec->ids[0];
+ snprintf(sdev->name, SDMA_DEVICE_NAME_LENGTH_MAX, "sdma%d", sdev->idx);
+
+ ret = sdma_init_channels(sdev, &info);
+ if (ret < 0) {
+ dev_err_probe(dev, ret, "failed to initialize channels\n");
+ goto disable_iommu;
+ }
+
+ ret = dma_async_device_register(&sdev->dma_dev);
+ if (ret < 0) {
+ dev_err_probe(dev, ret, "failed to register DMA engine\n");
+ goto destroy_channels;
+ }
+
+ return 0;
+
+destroy_channels:
+ sdma_destroy_channels(sdev);
+disable_iommu:
+ sdma_disable_iommu(dev);
+ return ret;
+}
+
+static int sdma_device_remove(struct platform_device *pdev)
+{
+ struct sdma_dev *sdev = dev_get_drvdata(&pdev->dev);
+
+ dma_async_device_unregister(&sdev->dma_dev);
+ sdma_disable_iommu(&pdev->dev);
+ sdma_destroy_channels(sdev);
+
+ return 0;
+}
+
+static const struct ascend_sdma_chip_data ascend910_chip_data = {
+ .channel_iomem_size = 0x400,
+};
+
+static const struct ascend_sdma_chip_data ascend310_chip_data = {
+ .channel_iomem_size = 0x1000,
+};
+
+static const struct of_device_id sdma_of_match[] = {
+ { .compatible = "hisilicon,ascend910-sdma", .data = &ascend910_chip_data },
+ { .compatible = "hisilicon,ascend310-sdma", .data = &ascend310_chip_data },
+ { }
+};
+MODULE_DEVICE_TABLE(of, sdma_of_match);
+
+static struct platform_driver sdma_driver = {
+ .probe = sdma_device_probe,
+ .remove = sdma_device_remove,
+ .driver = {
+ .name = "hisi-ascend-sdma",
+ .of_match_table = sdma_of_match,
+ },
+};
+
+module_platform_driver(sdma_driver);
+
+MODULE_DESCRIPTION("Driver for HiSilicon Ascend sdma hardware");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Wang Wensheng <wangwensheng4@xxxxxxxxxx>");
+MODULE_AUTHOR("Guo Mengqi <guomengqi3@xxxxxxxxxx>");
--
2.17.1
