- implement descriptor metadata operations to set device address for DMA
transfer
Signed-off-by: Nishad Saraf <nishads@xxxxxxx>
Signed-off-by: Lizhi Hou <lizhi.hou@xxxxxxx>
---
MAINTAINERS | 9 +
drivers/dma/Kconfig | 13 +
drivers/dma/Makefile | 1 +
drivers/dma/amd/Makefile | 8 +
drivers/dma/amd/qdma-comm-regs.c | 66 ++
drivers/dma/amd/qdma.c | 1189 ++++++++++++++++++++++++
drivers/dma/amd/qdma.h | 269 ++++++
include/linux/platform_data/amd_qdma.h | 36 +
8 files changed, 1591 insertions(+)
create mode 100644 drivers/dma/amd/Makefile
create mode 100644 drivers/dma/amd/qdma-comm-regs.c
create mode 100644 drivers/dma/amd/qdma.c
create mode 100644 drivers/dma/amd/qdma.h
create mode 100644 include/linux/platform_data/amd_qdma.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 53b7ca804465..a15c03738188 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1037,6 +1037,15 @@ L: dmaengine@xxxxxxxxxxxxxxx
S: Maintained
F: drivers/dma/ptdma/
+AMD QDMA DRIVER
+M: Nishad Saraf <nishads@xxxxxxx>
+M: Lizhi Hou <lizhi.hou@xxxxxxx>
+L: dmaengine@xxxxxxxxxxxxxxx
+S: Supported
+F: drivers/dma/amd/qdma.c
+F: drivers/dma/amd/qdma.h
+F: include/linux/platform_data/amd_qdma.h
+
AMD SEATTLE DEVICE TREE SUPPORT
M: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
M: Tom Lendacky <thomas.lendacky@xxxxxxx>
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 644c188d6a11..3646fe1ab347 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -85,6 +85,19 @@ config AMCC_PPC440SPE_ADMA
help
Enable support for the AMCC PPC440SPe RAID engines.
+config AMD_QDMA
+ tristate "AMD Queue-based DMA"
+ depends on HAS_IOMEM
+ select DMA_ENGINE
+ select DMA_VIRTUAL_CHANNELS
+ select REGMAP_MMIO
+ help
+ Enable support for the AMD Queue-based DMA subsystem. The primary
+ mechanism to transfer data using the QDMA is for the QDMA engine to
+ operate on instructions (descriptors) provided by the host operating
+ system. Using the descriptors, the QDMA can move data in both the Host
+ to Card (H2C) direction, or the Card to Host (C2H) direction.
+
config APPLE_ADMAC
tristate "Apple ADMAC support"
depends on ARCH_APPLE || COMPILE_TEST
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index a4fd1ce29510..75988d364ef4 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -82,6 +82,7 @@ obj-$(CONFIG_ST_FDMA) += st_fdma.o
obj-$(CONFIG_FSL_DPAA2_QDMA) += fsl-dpaa2-qdma/
obj-$(CONFIG_INTEL_LDMA) += lgm/
+obj-y += amd/
obj-y += mediatek/
obj-y += qcom/
obj-y += ti/
diff --git a/drivers/dma/amd/Makefile b/drivers/dma/amd/Makefile
new file mode 100644
index 000000000000..ba53971d2714
--- /dev/null
+++ b/drivers/dma/amd/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright (C) 2023, Advanced Micro Devices, Inc.
+#
+
+obj-$(CONFIG_AMD_QDMA) += amd-qdma.o
+
+amd-qdma-$(CONFIG_AMD_QDMA) := qdma.o qdma-comm-regs.o
diff --git a/drivers/dma/amd/qdma-comm-regs.c b/drivers/dma/amd/qdma-comm-regs.c
new file mode 100644
index 000000000000..59d66b2fec54
--- /dev/null
+++ b/drivers/dma/amd/qdma-comm-regs.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * DMA header for AMD CPM5 Queue-based DMA Subsystem variant
+ *
+ * Copyright (C) 2023, Advanced Micro Devices, Inc.
+ */
+
+#ifndef __QDMA_REGS_DEF_H
+#define __QDMA_REGS_DEF_H
+
+#include "qdma.h"
+
+const struct qdma_reg qdma_regos_default[QDMA_REGO_MAX] = {
+ [QDMA_REGO_CTXT_DATA] = QDMA_REGO(0x804, 8),
+ [QDMA_REGO_CTXT_CMD] = QDMA_REGO(0x844, 1),
+ [QDMA_REGO_CTXT_MASK] = QDMA_REGO(0x824, 8),
+ [QDMA_REGO_MM_H2C_CTRL] = QDMA_REGO(0x1004, 1),
+ [QDMA_REGO_MM_C2H_CTRL] = QDMA_REGO(0x1204, 1),
+ [QDMA_REGO_QUEUE_COUNT] = QDMA_REGO(0x120, 1),
+ [QDMA_REGO_RING_SIZE] = QDMA_REGO(0x204, 1),
+ [QDMA_REGO_H2C_PIDX] = QDMA_REGO(0x18004, 1),
+ [QDMA_REGO_C2H_PIDX] = QDMA_REGO(0x18008, 1),
+ [QDMA_REGO_INTR_CIDX] = QDMA_REGO(0x18000, 1),
+ [QDMA_REGO_FUNC_ID] = QDMA_REGO(0x12c, 1),
+ [QDMA_REGO_ERR_INT] = QDMA_REGO(0xb04, 1),
+ [QDMA_REGO_ERR_STAT] = QDMA_REGO(0x248, 1),
+};
+
+const struct qdma_reg_field qdma_regfs_default[QDMA_REGF_MAX] = {
+ /* QDMA_REGO_CTXT_DATA fields */
+ [QDMA_REGF_IRQ_ENABLE] = QDMA_REGF(53, 53),
+ [QDMA_REGF_WBK_ENABLE] = QDMA_REGF(52, 52),
+ [QDMA_REGF_WBI_CHECK] = QDMA_REGF(34, 34),
+ [QDMA_REGF_IRQ_ARM] = QDMA_REGF(16, 16),
+ [QDMA_REGF_IRQ_VEC] = QDMA_REGF(138, 128),
+ [QDMA_REGF_IRQ_AGG] = QDMA_REGF(139, 139),
+ [QDMA_REGF_WBI_INTVL_ENABLE] = QDMA_REGF(35, 35),
+ [QDMA_REGF_MRKR_DISABLE] = QDMA_REGF(62, 62),
+ [QDMA_REGF_QUEUE_ENABLE] = QDMA_REGF(32, 32),
+ [QDMA_REGF_QUEUE_MODE] = QDMA_REGF(63, 63),
+ [QDMA_REGF_DESC_BASE] = QDMA_REGF(127, 64),
+ [QDMA_REGF_DESC_SIZE] = QDMA_REGF(49, 48),
+ [QDMA_REGF_RING_ID] = QDMA_REGF(47, 44),
+ [QDMA_REGF_QUEUE_BASE] = QDMA_REGF(11, 0),
+ [QDMA_REGF_QUEUE_MAX] = QDMA_REGF(44, 32),
+ [QDMA_REGF_FUNCTION_ID] = QDMA_REGF(24, 17),
+ [QDMA_REGF_INTR_AGG_BASE] = QDMA_REGF(66, 15),
+ [QDMA_REGF_INTR_VECTOR] = QDMA_REGF(11, 1),
+ [QDMA_REGF_INTR_SIZE] = QDMA_REGF(69, 67),
+ [QDMA_REGF_INTR_VALID] = QDMA_REGF(0, 0),
+ [QDMA_REGF_INTR_COLOR] = QDMA_REGF(14, 14),
+ [QDMA_REGF_INTR_FUNCTION_ID] = QDMA_REGF(125, 114),
+ /* QDMA_REGO_CTXT_CMD fields */
+ [QDMA_REGF_CMD_INDX] = QDMA_REGF(19, 7),
+ [QDMA_REGF_CMD_CMD] = QDMA_REGF(6, 5),
+ [QDMA_REGF_CMD_TYPE] = QDMA_REGF(4, 1),
+ [QDMA_REGF_CMD_BUSY] = QDMA_REGF(0, 0),
+ /* QDMA_REGO_QUEUE_COUNT fields */
+ [QDMA_REGF_QUEUE_COUNT] = QDMA_REGF(11, 0),
+ /* QDMA_REGO_ERR_INT fields */
+ [QDMA_REGF_ERR_INT_FUNC] = QDMA_REGF(11, 0),
+ [QDMA_REGF_ERR_INT_VEC] = QDMA_REGF(22, 12),
+ [QDMA_REGF_ERR_INT_ARM] = QDMA_REGF(24, 24),
+};
+
+#endif /* __QDMA_CPM5_H */
diff --git a/drivers/dma/amd/qdma.c b/drivers/dma/amd/qdma.c
new file mode 100644
index 000000000000..b65214341551
--- /dev/null
+++ b/drivers/dma/amd/qdma.c
@@ -0,0 +1,1189 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * DMA driver for AMD Queue-based DMA Subsystem
+ *
+ * Copyright (C) 2023, Advanced Micro Devices, Inc.
+ */
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/dmaengine.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/dma-map-ops.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/amd_qdma.h>
+#include <linux/regmap.h>
+
+#include "../virt-dma.h"
+#include "qdma.h"
+
+#define CHAN_STR(q) (((q)->dir == DMA_MEM_TO_DEV) ? "H2C" : "C2H")
+#define QDMA_REG_OFF(d, r) ((d)->roffs[r].off)
+
+/* MMIO regmap config for all QDMA registers */
+static const struct regmap_config qdma_regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+};
+
+static inline struct qdma_queue *to_qdma_queue(struct dma_chan *chan)
+{
+ return container_of(chan, struct qdma_queue, vchan.chan);
+}
+
+static inline struct qdma_mm_vdesc *to_qdma_vdesc(struct virt_dma_desc *vdesc)
+{
+ return container_of(vdesc, struct qdma_mm_vdesc, vdesc);
+}
+
+static inline u32 qdma_get_intr_ring_idx(struct qdma_device *qdev)
+{
+ u32 idx;
+
+ idx = qdev->qintr_rings[qdev->qintr_ring_idx++].ridx;
+ qdev->qintr_ring_idx %= qdev->qintr_ring_num;
+
+ return idx;
+}
+
+static u64 qdma_get_field(const struct qdma_device *qdev, const u32 *data,
+ enum qdma_reg_fields field)
+{
+ const struct qdma_reg_field *f = &qdev->rfields[field];
+ u16 low_pos, hi_pos, low_bit, hi_bit;
+ u64 value = 0, mask;
+
+ low_pos = f->lsb / BITS_PER_TYPE(*data);
+ hi_pos = f->msb / BITS_PER_TYPE(*data);
+
+ if (low_pos == hi_pos) {
+ low_bit = f->lsb % BITS_PER_TYPE(*data);
+ hi_bit = f->msb % BITS_PER_TYPE(*data);
+ mask = GENMASK(hi_bit, low_bit);
+ value = (data[low_pos] & mask) >> low_bit;
+ } else if (hi_pos == low_pos + 1) {
+ low_bit = f->lsb % BITS_PER_TYPE(*data);
+ hi_bit = low_bit + (f->msb - f->lsb);
+ value = ((u64)data[hi_pos] << BITS_PER_TYPE(*data)) |
+ data[low_pos];
+ mask = GENMASK_ULL(hi_bit, low_bit);
+ value = (value & mask) >> low_bit;
+ } else {
+ hi_bit = f->msb % BITS_PER_TYPE(*data);
+ mask = GENMASK(hi_bit, 0);
+ value = data[hi_pos] & mask;
+ low_bit = f->msb - f->lsb - hi_bit;
+ value <<= low_bit;
+ low_bit -= 32;
+ value |= (u64)data[hi_pos - 1] << low_bit;
+ mask = GENMASK(31, 32 - low_bit);
+ value |= (data[hi_pos - 2] & mask) >> low_bit;
+ }
+
+ return value;
+}
+
+static void qdma_set_field(const struct qdma_device *qdev, u32 *data,
+ enum qdma_reg_fields field, u64 value)
+{
+ const struct qdma_reg_field *f = &qdev->rfields[field];
+ u16 low_pos, hi_pos, low_bit;
+
+ low_pos = f->lsb / BITS_PER_TYPE(*data);
+ hi_pos = f->msb / BITS_PER_TYPE(*data);
+ low_bit = f->lsb % BITS_PER_TYPE(*data);
+
+ data[low_pos++] |= value << low_bit;
+ if (low_pos <= hi_pos)
+ data[low_pos++] |= (u32)(value >> (32 - low_bit));
+ if (low_pos <= hi_pos)
+ data[low_pos] |= (u32)(value >> (64 - low_bit));
+}
+
+static inline int qdma_reg_write(const struct qdma_device *qdev,
+ const u32 *data, enum qdma_regs reg)
+{
+ const struct qdma_reg *r = &qdev->roffs[reg];
+ int ret;
+
+ if (r->count > 1)
+ ret = regmap_bulk_write(qdev->regmap, r->off, data, r->count);
+ else
+ ret = regmap_write(qdev->regmap, r->off, *data);
+
+ return ret;
+}
+
+static inline int qdma_reg_read(const struct qdma_device *qdev, u32 *data,
+ enum qdma_regs reg)
+{
+ const struct qdma_reg *r = &qdev->roffs[reg];
+ int ret;
+
+ if (r->count > 1)
+ ret = regmap_bulk_read(qdev->regmap, r->off, data, r->count);
+ else
+ ret = regmap_read(qdev->regmap, r->off, data);
+
+ return ret;
+}
+
+static int qdma_context_cmd_execute(const struct qdma_device *qdev,
+ enum qdma_ctxt_type type,
+ enum qdma_ctxt_cmd cmd, u16 index)
+{
+ u32 value = 0;
+ int ret;
+
+ qdma_set_field(qdev, &value, QDMA_REGF_CMD_INDX, index);
+ qdma_set_field(qdev, &value, QDMA_REGF_CMD_CMD, cmd);
+ qdma_set_field(qdev, &value, QDMA_REGF_CMD_TYPE, type);
+
+ ret = qdma_reg_write(qdev, &value, QDMA_REGO_CTXT_CMD);
+ if (ret)
+ return ret;
+
+ ret = regmap_read_poll_timeout(qdev->regmap,
+ QDMA_REG_OFF(qdev, QDMA_REGO_CTXT_CMD),
+ value,
+ !qdma_get_field(qdev, &value,
+ QDMA_REGF_CMD_BUSY),
+ QDMA_POLL_INTRVL_US,
+ QDMA_POLL_TIMEOUT_US);
+ if (ret) {
+ qdma_err(qdev, "Context command execution timed out");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int qdma_context_write_data(const struct qdma_device *qdev,
+ const u32 *data)
+{
+ u32 mask[QDMA_CTXT_REGMAP_LEN];
+ int ret;
+
+ memset(mask, ~0, sizeof(mask));
+
+ ret = qdma_reg_write(qdev, mask, QDMA_REGO_CTXT_MASK);
+ if (ret)
+ return ret;
+
+ ret = qdma_reg_write(qdev, data, QDMA_REGO_CTXT_DATA);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void qdma_prep_sw_desc_context(const struct qdma_device *qdev,
+ const struct qdma_ctxt_sw_desc *ctxt,
+ u32 *data)
+{
+ memset(data, 0, QDMA_CTXT_REGMAP_LEN * sizeof(*data));
+ qdma_set_field(qdev, data, QDMA_REGF_DESC_BASE, ctxt->desc_base);
+ qdma_set_field(qdev, data, QDMA_REGF_IRQ_VEC, ctxt->vec);
+ qdma_set_field(qdev, data, QDMA_REGF_FUNCTION_ID, qdev->fid);
+
+ qdma_set_field(qdev, data, QDMA_REGF_DESC_SIZE, QDMA_DESC_SIZE_32B);
+ qdma_set_field(qdev, data, QDMA_REGF_RING_ID, QDMA_DEFAULT_RING_ID);
+ qdma_set_field(qdev, data, QDMA_REGF_QUEUE_MODE, QDMA_QUEUE_OP_MM);
+ qdma_set_field(qdev, data, QDMA_REGF_IRQ_ENABLE, 1);
+ qdma_set_field(qdev, data, QDMA_REGF_WBK_ENABLE, 1);
+ qdma_set_field(qdev, data, QDMA_REGF_WBI_CHECK, 1);
+ qdma_set_field(qdev, data, QDMA_REGF_IRQ_ARM, 1);
+ qdma_set_field(qdev, data, QDMA_REGF_IRQ_AGG, 1);
+ qdma_set_field(qdev, data, QDMA_REGF_WBI_INTVL_ENABLE, 1);
+ qdma_set_field(qdev, data, QDMA_REGF_QUEUE_ENABLE, 1);
+ qdma_set_field(qdev, data, QDMA_REGF_MRKR_DISABLE, 1);
+}
+
+static void qdma_prep_intr_context(const struct qdma_device *qdev,
+ const struct qdma_ctxt_intr *ctxt,
+ u32 *data)
+{
+ memset(data, 0, QDMA_CTXT_REGMAP_LEN * sizeof(*data));
+ qdma_set_field(qdev, data, QDMA_REGF_INTR_AGG_BASE, ctxt->agg_base);
+ qdma_set_field(qdev, data, QDMA_REGF_INTR_VECTOR, ctxt->vec);
+ qdma_set_field(qdev, data, QDMA_REGF_INTR_SIZE, ctxt->size);
+ qdma_set_field(qdev, data, QDMA_REGF_INTR_VALID, ctxt->valid);
+ qdma_set_field(qdev, data, QDMA_REGF_INTR_COLOR, ctxt->color);
+ qdma_set_field(qdev, data, QDMA_REGF_INTR_FUNCTION_ID, qdev->fid);
+}
+
+static void qdma_prep_fmap_context(const struct qdma_device *qdev,
+ const struct qdma_ctxt_fmap *ctxt,
+ u32 *data)
+{
+ memset(data, 0, QDMA_CTXT_REGMAP_LEN * sizeof(*data));
+ qdma_set_field(qdev, data, QDMA_REGF_QUEUE_BASE, ctxt->qbase);
+ qdma_set_field(qdev, data, QDMA_REGF_QUEUE_MAX, ctxt->qmax);
+}
+
+/*
+ * Program the indirect context register space
+ *
+ * Once the queue is enabled, context is dynamically updated by hardware. Any
+ * modification of the context through this API when the queue is enabled can
+ * result in unexpected behavior. Reading the context when the queue is enabled
+ * is not recommended as it can result in reduced performance.
+ */
+static int qdma_prog_context(struct qdma_device *qdev, enum qdma_ctxt_type type,
+ enum qdma_ctxt_cmd cmd, u16 index, u32 *ctxt)
+{
+ int ret;
+
+ mutex_lock(&qdev->ctxt_lock);
+ if (cmd == QDMA_CTXT_WRITE) {
+ ret = qdma_context_write_data(qdev, ctxt);
+ if (ret)
+ goto failed;
+ }
+
+ ret = qdma_context_cmd_execute(qdev, type, cmd, index);
+ if (ret)
+ goto failed;
+
+ if (cmd == QDMA_CTXT_READ) {
+ ret = qdma_reg_read(qdev, ctxt, QDMA_REGO_CTXT_DATA);
+ if (ret)
+ goto failed;
+ }
+
+failed:
+ mutex_unlock(&qdev->ctxt_lock);
+
+ return ret;
+}
+
+static int qdma_check_queue_status(struct qdma_device *qdev,
+ enum dma_transfer_direction dir, u16 qid)
+{
+ u32 status, data[QDMA_CTXT_REGMAP_LEN] = {0};
+ enum qdma_ctxt_type type;
+ int ret;
+
+ if (dir == DMA_MEM_TO_DEV)
+ type = QDMA_CTXT_DESC_SW_H2C;
+ else
+ type = QDMA_CTXT_DESC_SW_C2H;
+
+ ret = qdma_prog_context(qdev, type, QDMA_CTXT_READ, qid, data);
+ if (ret)
+ return ret;
+
+ status = qdma_get_field(qdev, data, QDMA_REGF_QUEUE_ENABLE);
+ if (status) {
+ qdma_err(qdev, "queue %d already in use", qid);
+ return -EBUSY;
+ }
+
+ return 0;
+}
+
+static int qdma_clear_queue_context(const struct qdma_queue *queue)
+{
+ enum qdma_ctxt_type h2c_types[] = { QDMA_CTXT_DESC_SW_H2C,
+ QDMA_CTXT_DESC_HW_H2C,
+ QDMA_CTXT_DESC_CR_H2C,
+ QDMA_CTXT_PFTCH, };
+ enum qdma_ctxt_type c2h_types[] = { QDMA_CTXT_DESC_SW_C2H,
+ QDMA_CTXT_DESC_HW_C2H,
+ QDMA_CTXT_DESC_CR_C2H,
+ QDMA_CTXT_PFTCH, };
+ struct qdma_device *qdev = queue->qdev;
+ enum qdma_ctxt_type *type;
+ int ret, num, i;
+
+ if (queue->dir == DMA_MEM_TO_DEV) {
+ type = h2c_types;
+ num = ARRAY_SIZE(h2c_types);
+ } else {
+ type = c2h_types;
+ num = ARRAY_SIZE(c2h_types);
+ }
+ for (i = 0; i < num; i++) {
+ ret = qdma_prog_context(qdev, type[i], QDMA_CTXT_CLEAR,
+ queue->qid, NULL);
+ if (ret) {
+ qdma_err(qdev, "Failed to clear ctxt %d", type[i]);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int qdma_setup_fmap_context(struct qdma_device *qdev)
+{
+ u32 ctxt[QDMA_CTXT_REGMAP_LEN];
+ struct qdma_ctxt_fmap fmap;
+ int ret;
+
+ ret = qdma_prog_context(qdev, QDMA_CTXT_FMAP, QDMA_CTXT_CLEAR,
+ qdev->fid, NULL);
+ if (ret) {
+ qdma_err(qdev, "Failed clearing context");
+ return ret;
+ }
+
+ fmap.qbase = 0;
+ fmap.qmax = qdev->chan_num * 2;
+ qdma_prep_fmap_context(qdev, &fmap, ctxt);
+ ret = qdma_prog_context(qdev, QDMA_CTXT_FMAP, QDMA_CTXT_WRITE,
+ qdev->fid, ctxt);
+ if (ret)
+ qdma_err(qdev, "Failed setup fmap, ret %d", ret);
+
+ return ret;
+}
+
+static int qdma_setup_queue_context(struct qdma_device *qdev,
+ const struct qdma_ctxt_sw_desc *sw_desc,
+ enum dma_transfer_direction dir, u16 qid)
+{
+ u32 ctxt[QDMA_CTXT_REGMAP_LEN];
+ enum qdma_ctxt_type type;
+ int ret;
+
+ if (dir == DMA_MEM_TO_DEV)
+ type = QDMA_CTXT_DESC_SW_H2C;
+ else
+ type = QDMA_CTXT_DESC_SW_C2H;
+
+ qdma_prep_sw_desc_context(qdev, sw_desc, ctxt);
+ /* Setup SW descriptor context */
+ ret = qdma_prog_context(qdev, type, QDMA_CTXT_WRITE, qid, ctxt);
+ if (ret)
+ qdma_err(qdev, "Failed setup SW desc ctxt for queue: %d", qid);
+
+ return ret;
+}
+
+/*
+ * Enable or disable memory-mapped DMA engines
+ * 1: enable, 0: disable
+ */
+static int qdma_sgdma_control(struct qdma_device *qdev, u32 ctrl)
+{
+ int ret;
+
+ ret = qdma_reg_write(qdev, &ctrl, QDMA_REGO_MM_H2C_CTRL);
+ ret |= qdma_reg_write(qdev, &ctrl, QDMA_REGO_MM_C2H_CTRL);
+
+ return ret;
+}
+
+static int qdma_get_hw_info(struct qdma_device *qdev)
+{
+ struct qdma_platdata *pdata = dev_get_platdata(&qdev->pdev->dev);
+ u32 value = 0;
+ int ret;
+
+ ret = qdma_reg_read(qdev, &value, QDMA_REGO_QUEUE_COUNT);
+ if (ret)
+ return ret;
+
+ value = qdma_get_field(qdev, &value, QDMA_REGF_QUEUE_COUNT) + 1;
+ if (pdata->max_mm_channels * 2 > value) {
+ qdma_err(qdev, "not enough hw queues %d", value);
+ return -EINVAL;
+ }
+ qdev->chan_num = pdata->max_mm_channels;
+
+ ret = qdma_reg_read(qdev, &qdev->fid, QDMA_REGO_FUNC_ID);
+ if (ret)
+ return ret;
+
+ qdma_info(qdev, "max channel %d, function id %d",
+ qdev->chan_num, qdev->fid);
+
+ return 0;
+}
+
+static inline int qdma_update_pidx(const struct qdma_queue *queue, u16 pidx)
+{
+ struct qdma_device *qdev = queue->qdev;
+
+ return regmap_write(qdev->regmap, queue->pidx_reg,
+ pidx | QDMA_QUEUE_ARM_BIT);
+}
+
+static inline int qdma_update_cidx(const struct qdma_queue *queue,
+ u16 ridx, u16 cidx)
+{
+ struct qdma_device *qdev = queue->qdev;
+
+ return regmap_write(qdev->regmap, queue->cidx_reg,
+ ((u32)ridx << 16) | cidx);
+}
+
+/**
+ * qdma_free_vdesc - Free descriptor
+ * @vdesc: Virtual DMA descriptor
+ */
+static void qdma_free_vdesc(struct virt_dma_desc *vdesc)
+{
+ struct qdma_mm_vdesc *vd = to_qdma_vdesc(vdesc);
+
+ kfree(vd);
+}
+
+static int qdma_alloc_queues(struct qdma_device *qdev,
+ enum dma_transfer_direction dir)
+{
+ struct qdma_queue *q, **queues;
+ u32 i, pidx_base;
+ int ret;
+
+ if (dir == DMA_MEM_TO_DEV) {
+ queues = &qdev->h2c_queues;
+ pidx_base = QDMA_REG_OFF(qdev, QDMA_REGO_H2C_PIDX);
+ } else {
+ queues = &qdev->c2h_queues;
+ pidx_base = QDMA_REG_OFF(qdev, QDMA_REGO_C2H_PIDX);
+ }
+
+ *queues = devm_kcalloc(&qdev->pdev->dev, qdev->chan_num, sizeof(*q),
+ GFP_KERNEL);
+ if (!*queues)
+ return -ENOMEM;
+
+ for (i = 0; i < qdev->chan_num; i++) {
+ ret = qdma_check_queue_status(qdev, dir, i);
+ if (ret)
+ return ret;
+
+ q = &(*queues)[i];
+ q->ring_size = QDMA_DEFAULT_RING_SIZE;
+ q->idx_mask = q->ring_size - 2;
+ q->qdev = qdev;
+ q->dir = dir;
+ q->qid = i;
+ q->pidx_reg = pidx_base + i * QDMA_DMAP_REG_STRIDE;
+ q->cidx_reg = QDMA_REG_OFF(qdev, QDMA_REGO_INTR_CIDX) +
+ i * QDMA_DMAP_REG_STRIDE;
+ q->vchan.desc_free = qdma_free_vdesc;
+ vchan_init(&q->vchan, &qdev->dma_dev);
+ }
+
+ return 0;
+}
+
+static int qdma_device_verify(struct qdma_device *qdev)
+{
+ u32 value;
+ int ret;
+
+ ret = regmap_read(qdev->regmap, QDMA_IDENTIFIER_REGOFF, &value);
+ if (ret)
+ return ret;
+
+ value = FIELD_GET(QDMA_IDENTIFIER_MASK, value);
+ if (value != QDMA_IDENTIFIER) {
+ qdma_err(qdev, "Invalid identifier");
+ return -ENODEV;
+ }
+ qdev->rfields = qdma_regfs_default;
+ qdev->roffs = qdma_regos_default;
+
+ return 0;
+}
+
+static int qdma_device_setup(struct qdma_device *qdev)
+{
+ struct device *dev = &qdev->pdev->dev;
+ u32 ring_sz = QDMA_DEFAULT_RING_SIZE;
+ int ret = 0;
+
+ while (dev && get_dma_ops(dev))
+ dev = dev->parent;
+ if (!dev) {
+ qdma_err(qdev, "dma device not found");
+ return -EINVAL;
+ }
+ set_dma_ops(&qdev->pdev->dev, get_dma_ops(dev));
+
+ ret = qdma_setup_fmap_context(qdev);
+ if (ret) {
+ qdma_err(qdev, "Failed setup fmap context");
+ return ret;
+ }
+
+ /* Setup global ring buffer size at QDMA_DEFAULT_RING_ID index */
+ ret = qdma_reg_write(qdev, &ring_sz, QDMA_REGO_RING_SIZE);
+ if (ret) {
+ qdma_err(qdev, "Failed to setup ring %d of size %ld",
+ QDMA_DEFAULT_RING_ID, QDMA_DEFAULT_RING_SIZE);
+ return ret;
+ }
+
+ /* Enable memory-mapped DMA engine in both directions */
+ ret = qdma_sgdma_control(qdev, 1);
+ if (ret) {
+ qdma_err(qdev, "Failed to SGDMA with error %d", ret);
+ return ret;
+ }
+
+ ret = qdma_alloc_queues(qdev, DMA_MEM_TO_DEV);
+ if (ret) {
+ qdma_err(qdev, "Failed to alloc H2C queues, ret %d", ret);
+ return ret;
+ }
+
+ ret = qdma_alloc_queues(qdev, DMA_DEV_TO_MEM);
+ if (ret) {
+ qdma_err(qdev, "Failed to alloc C2H queues, ret %d", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * qdma_free_queue_resources() - Free queue resources
+ * @chan: DMA channel
+ */
+static void qdma_free_queue_resources(struct dma_chan *chan)
+{
+ struct qdma_queue *queue = to_qdma_queue(chan);
+ struct qdma_device *qdev = queue->qdev;
+ struct device *dev = qdev->dma_dev.dev;
+
+ qdma_clear_queue_context(queue);
+ vchan_free_chan_resources(&queue->vchan);
+ dma_free_coherent(dev, queue->ring_size * QDMA_MM_DESC_SIZE,
+ queue->desc_base, queue->dma_desc_base);
+}
+
+/**
+ * qdma_alloc_queue_resources() - Allocate queue resources
+ * @chan: DMA channel
+ */
+static int qdma_alloc_queue_resources(struct dma_chan *chan)
+{
+ struct qdma_queue *queue = to_qdma_queue(chan);
+ struct qdma_device *qdev = queue->qdev;
+ struct qdma_ctxt_sw_desc desc;
+ size_t size;
+ int ret;
+
+ ret = qdma_clear_queue_context(queue);
+ if (ret)
+ return ret;
+
+ size = queue->ring_size * QDMA_MM_DESC_SIZE;
+ queue->desc_base = dma_alloc_coherent(qdev->dma_dev.dev, size,
+ &queue->dma_desc_base,
+ GFP_KERNEL);
+ if (!queue->desc_base) {
+ qdma_err(qdev, "Failed to allocate descriptor ring");
+ return -ENOMEM;
+ }
+
+ /* Setup SW descriptor queue context for DMA memory map */
+ desc.vec = qdma_get_intr_ring_idx(qdev);
+ desc.desc_base = queue->dma_desc_base;
+ ret = qdma_setup_queue_context(qdev, &desc, queue->dir, queue->qid);
+ if (ret) {
+ qdma_err(qdev, "Failed to setup SW desc ctxt for %s",
+ chan->name);
+ dma_free_coherent(qdev->dma_dev.dev, size, queue->desc_base,
+ queue->dma_desc_base);
+ return ret;
+ }
+
+ queue->pidx = 0;
+ queue->cidx = 0;
+
+ return 0;
+}
+
+static bool qdma_filter_fn(struct dma_chan *chan, void *param)
+{
+ struct qdma_queue *queue = to_qdma_queue(chan);
+ struct qdma_queue_info *info = param;
+
+ return info->dir == queue->dir;
+}
+
+static int qdma_xfer_start(struct qdma_queue *queue)
+{
+ struct qdma_device *qdev = queue->qdev;
+ int ret;
+
+ if (!vchan_next_desc(&queue->vchan))
+ return 0;
+
+ qdma_dbg(qdev, "Tnx kickoff with P: %d for %s%d",
+ queue->issued_vdesc->pidx, CHAN_STR(queue), queue->qid);
+
+ ret = qdma_update_pidx(queue, queue->issued_vdesc->pidx);
+ if (ret) {
+ qdma_err(qdev, "Failed to update PIDX to %d for %s queue: %d",
+ queue->pidx, CHAN_STR(queue), queue->qid);
+ }
+
+ return ret;
+}
+
+static void qdma_issue_pending(struct dma_chan *chan)
+{
+ struct qdma_queue *queue = to_qdma_queue(chan);
+ unsigned long flags;
+
+ spin_lock_irqsave(&queue->vchan.lock, flags);
+ if (vchan_issue_pending(&queue->vchan)) {
+ if (queue->submitted_vdesc) {
+ queue->issued_vdesc = queue->submitted_vdesc;
+ queue->submitted_vdesc = NULL;
+ }
+ qdma_xfer_start(queue);
+ }
+
+ spin_unlock_irqrestore(&queue->vchan.lock, flags);
+}
+
+static struct qdma_mm_desc *qdma_get_desc(struct qdma_queue *q)
+{
+ struct qdma_mm_desc *desc;
+
+ if (((q->pidx + 1) & q->idx_mask) == q->cidx)
+ return NULL;
+
+ desc = q->desc_base + q->pidx;
+ q->pidx = (q->pidx + 1) & q->idx_mask;
+
+ return desc;
+}
+
+static int qdma_hw_enqueue(struct qdma_queue *q, struct qdma_mm_vdesc *vdesc)
+{
+ struct qdma_mm_desc *desc;
+ struct scatterlist *sg;
+ u64 addr, *src, *dst;
+ u32 rest, len;
+ int ret = 0;
+ u32 i;
+
+ if (!vdesc->sg_len)
+ return 0;
+
+ if (q->dir == DMA_MEM_TO_DEV) {
+ dst = &vdesc->dev_addr;
+ src = &addr;
+ } else {
+ dst = &addr;
+ src = &vdesc->dev_addr;
+ }
+
+ for_each_sg(vdesc->sgl, sg, vdesc->sg_len, i) {
+ addr = sg_dma_address(sg) + vdesc->sg_off;
+ rest = sg_dma_len(sg) - vdesc->sg_off;
+ while (rest) {
+ len = min_t(u32, rest, QDMA_MM_DESC_MAX_LEN);
+ desc = qdma_get_desc(q);
+ if (!desc) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ desc->src_addr = cpu_to_le64(*src);
+ desc->dst_addr = cpu_to_le64(*dst);
+ desc->len = cpu_to_le32(len);
+
+ vdesc->dev_addr += len;
+ vdesc->sg_off += len;
+ vdesc->pending_descs++;
+ addr += len;
+ rest -= len;
+ }
+ vdesc->sg_off = 0;
+ }
+out:
+ vdesc->sg_len -= i;
+ vdesc->pidx = q->pidx;
+ return ret;
+}
+
+static void qdma_fill_pending_vdesc(struct qdma_queue *q)
+{
+ struct virt_dma_chan *vc = &q->vchan;
+ struct qdma_mm_vdesc *vdesc;
+ struct virt_dma_desc *vd;
+ int ret;
+
+ if (!list_empty(&vc->desc_issued)) {
+ vd = &q->issued_vdesc->vdesc;
+ list_for_each_entry_from(vd, &vc->desc_issued, node) {
+ vdesc = to_qdma_vdesc(vd);
+ ret = qdma_hw_enqueue(q, vdesc);
+ if (ret) {
+ q->issued_vdesc = vdesc;
+ return;
+ }
+ }
+ q->issued_vdesc = vdesc;
+ }
+
+ if (list_empty(&vc->desc_submitted))
+ return;
+
+ if (q->submitted_vdesc)
+ vd = &q->submitted_vdesc->vdesc;
+ else
+ vd = list_first_entry(&vc->desc_submitted, typeof(*vd), node);
+
+ list_for_each_entry_from(vd, &vc->desc_submitted, node) {
+ vdesc = to_qdma_vdesc(vd);
+ ret = qdma_hw_enqueue(q, vdesc);
+ if (ret)
+ break;
+ }
+ q->submitted_vdesc = vdesc;
+}
+
+static dma_cookie_t qdma_tx_submit(struct dma_async_tx_descriptor *tx)
+{
+ struct virt_dma_chan *vc = to_virt_chan(tx->chan);
+ struct qdma_queue *q = to_qdma_queue(&vc->chan);
+ struct virt_dma_desc *vd;
+ unsigned long flags;
+ dma_cookie_t cookie;
+
+ vd = container_of(tx, struct virt_dma_desc, tx);
+ spin_lock_irqsave(&vc->lock, flags);
+ cookie = dma_cookie_assign(tx);
+
+ list_move_tail(&vd->node, &vc->desc_submitted);
+ qdma_fill_pending_vdesc(q);
+ spin_unlock_irqrestore(&vc->lock, flags);
+
+ return cookie;
+}
+
+static void *qdma_get_metadata_ptr(struct dma_async_tx_descriptor *tx,
+ size_t *payload_len, size_t *max_len)
+{
+ struct qdma_mm_vdesc *vdesc;
+
+ vdesc = container_of(tx, typeof(*vdesc), vdesc.tx);
+ if (payload_len)
+ *payload_len = sizeof(vdesc->dev_addr);
+ if (max_len)
+ *max_len = *payload_len;
+
+ return &vdesc->dev_addr;
+}
+
+static int qdma_set_metadata_len(struct dma_async_tx_descriptor *tx,
+ size_t payload_len)
+{
+ struct qdma_mm_vdesc *vdesc;
+
+ vdesc = container_of(tx, typeof(*vdesc), vdesc.tx);
+ if (payload_len != sizeof(vdesc->dev_addr))
+ return -EINVAL;
+
+ return 0;
+}
+
+static struct dma_descriptor_metadata_ops metadata_ops = {
+ .get_ptr = qdma_get_metadata_ptr,
+ .set_len = qdma_set_metadata_len,
+};
+
+static struct dma_async_tx_descriptor *
+qdma_prep_device_sg(struct dma_chan *chan, struct scatterlist *sgl,
+ unsigned int sg_len, enum dma_transfer_direction dir,
+ unsigned long flags, void *context)
+{
+ struct qdma_queue *q = to_qdma_queue(chan);
+ struct dma_async_tx_descriptor *tx;
+ struct qdma_mm_vdesc *vdesc;
+
+ vdesc = kzalloc(sizeof(*vdesc), GFP_NOWAIT);
+ if (!vdesc)
+ return NULL;
+ vdesc->sgl = sgl;
+ vdesc->sg_len = sg_len;
+
+ tx = vchan_tx_prep(&q->vchan, &vdesc->vdesc, flags);
+ tx->tx_submit = qdma_tx_submit;
+ tx->metadata_ops = &metadata_ops;
+
+ return tx;
+}
+
+static int qdma_arm_err_intr(const struct qdma_device *qdev)
+{
+ u32 value = 0;
+
+ qdma_set_field(qdev, &value, QDMA_REGF_ERR_INT_FUNC, qdev->fid);
+ qdma_set_field(qdev, &value, QDMA_REGF_ERR_INT_VEC, qdev->err_irq_idx);
+ qdma_set_field(qdev, &value, QDMA_REGF_ERR_INT_ARM, 1);
+
+ return qdma_reg_write(qdev, &value, QDMA_REGO_ERR_INT);
+}
+
+static irqreturn_t qdma_error_isr(int irq, void *data)
+{
+ struct qdma_device *qdev = data;
+ u32 err_stat = 0;
+ int ret;
+
+ ret = qdma_reg_read(qdev, &err_stat, QDMA_REGO_ERR_STAT);
+ if (ret) {
+ qdma_err(qdev, "read error state failed, ret %d", ret);
+ goto out;
+ }
+
+ qdma_err(qdev, "global error %d", err_stat);
+ ret = qdma_reg_write(qdev, &err_stat, QDMA_REGO_ERR_STAT);
+ if (ret)
+ qdma_err(qdev, "clear error state failed, ret %d", ret);
+
+out:
+ qdma_arm_err_intr(qdev);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t qdma_queue_isr(int irq, void *data)
+{
+ struct qdma_intr_ring *intr = data;
+ struct qdma_queue *q = NULL;
+ struct qdma_device *qdev;
+ u32 index, comp_desc;
+ u64 intr_ent;
+ u8 color;
+ int ret;
+ u16 qid;
+
+ qdev = intr->qdev;
+ index = intr->cidx;
+ while (1) {
+ struct virt_dma_desc *vd;
+ struct qdma_mm_vdesc *vdesc;
+ unsigned long flags;
+ u32 cidx;
+
+ intr_ent = le64_to_cpu(intr->base[index]);
+ color = FIELD_GET(QDMA_INTR_MASK_COLOR, intr_ent);
+ if (color != intr->color)
+ break;
+
+ qid = FIELD_GET(QDMA_INTR_MASK_QID, intr_ent);
+ if (FIELD_GET(QDMA_INTR_MASK_TYPE, intr_ent))
+ q = qdev->c2h_queues;
+ else
+ q = qdev->h2c_queues;
+ q += qid;
+
+ cidx = FIELD_GET(QDMA_INTR_MASK_CIDX, intr_ent);
+
+ spin_lock_irqsave(&q->vchan.lock, flags);
+ comp_desc = (cidx - q->cidx) & q->idx_mask;
+
+ vd = vchan_next_desc(&q->vchan);
+ if (!vd)
+ goto skip;
+
+ vdesc = to_qdma_vdesc(vd);
+ while (comp_desc > vdesc->pending_descs) {
+ list_del(&vd->node);
+ vchan_cookie_complete(vd);
+ comp_desc -= vdesc->pending_descs;
+ vd = vchan_next_desc(&q->vchan);
+ vdesc = to_qdma_vdesc(vd);
+ }
+ vdesc->pending_descs -= comp_desc;
+ if (!vdesc->pending_descs && QDMA_VDESC_QUEUED(vdesc)) {
+ list_del(&vd->node);
+ vchan_cookie_complete(vd);
+ }
+ q->cidx = cidx;
+
+ qdma_fill_pending_vdesc(q);
+ qdma_xfer_start(q);
+
+skip:
+ spin_unlock_irqrestore(&q->vchan.lock, flags);
+
+ /*
+ * Wrap the index value and flip the expected color value if
+ * interrupt aggregation PIDX has wrapped around.
+ */
+ index++;
+ index &= QDMA_INTR_RING_IDX_MASK;
+ if (!index)
+ intr->color = !intr->color;
+ }
+
+ /*
+ * Update the software interrupt aggregation ring CIDX if a valid entry
+ * was found.
+ */
+ if (q) {
+ qdma_dbg(qdev, "update intr ring%d %d", intr->ridx, index);
+
+ /*
+ * Record the last read index of status descriptor from the
+ * interrupt aggregation ring.
+ */
+ intr->cidx = index;
+
+ ret = qdma_update_cidx(q, intr->ridx, index);
+ if (ret) {
+ qdma_err(qdev, "Failed to update IRQ CIDX");
+ return IRQ_NONE;
+ }
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int qdma_init_error_irq(struct qdma_device *qdev)
+{
+ struct device *dev = &qdev->pdev->dev;
+ int ret;
+ u32 vec;
+
+ vec = qdev->queue_irq_start - 1;
+
+ ret = devm_request_threaded_irq(dev, vec, NULL, qdma_error_isr,
+ IRQF_ONESHOT, "amd-qdma-error", qdev);
+ if (ret) {
+ qdma_err(qdev, "Failed to request error IRQ vector: %d", vec);
+ return ret;
+ }
+
+ ret = qdma_arm_err_intr(qdev);
+ if (ret)
+ qdma_err(qdev, "Failed to arm err interrupt, ret %d", ret);
+
+ return ret;
+}
+
+static void qdma_free_qintr_rings(struct qdma_device *qdev)
+{
+ int i;
+
+ for (i = 0; i < qdev->qintr_ring_num; i++) {
+ if (!qdev->qintr_rings[i].base)
+ continue;
+
+ dma_free_coherent(&qdev->pdev->dev, QDMA_INTR_RING_SIZE,
+ qdev->qintr_rings[i].base,
+ qdev->qintr_rings[i].dev_base);
+ }
+}
+
+static int qdma_alloc_qintr_rings(struct qdma_device *qdev)
+{
+ u32 ctxt[QDMA_CTXT_REGMAP_LEN];
+ struct device *dev = &qdev->pdev->dev;
+ struct qdma_intr_ring *ring;
+ struct qdma_ctxt_intr intr_ctxt;
+ u32 vector;
+ int ret, i;
+
+ qdev->qintr_ring_num = qdev->queue_irq_num;
+ qdev->qintr_rings = devm_kcalloc(dev, qdev->qintr_ring_num,
+ sizeof(*qdev->qintr_rings),
+ GFP_KERNEL);
+ if (!qdev->qintr_rings)
+ return -ENOMEM;
+
+ vector = qdev->queue_irq_start;
+ for (i = 0; i < qdev->qintr_ring_num; i++, vector++) {
+ ring = &qdev->qintr_rings[i];
+ ring->qdev = qdev;
+ ring->msix_id = qdev->err_irq_idx + i + 1;
+ ring->ridx = i;
+ ring->color = 1;
+ ring->base = dma_alloc_coherent(dev, QDMA_INTR_RING_SIZE,
+ &ring->dev_base,
+ GFP_KERNEL);
+ if (!ring->base) {
+ qdma_err(qdev, "Failed to alloc intr ring %d", i);
+ ret = -ENOMEM;
+ goto failed;
+ }
+ intr_ctxt.agg_base = QDMA_INTR_RING_BASE(ring->dev_base);
+ intr_ctxt.size = (QDMA_INTR_RING_SIZE - 1) / 4096;
+ intr_ctxt.vec = ring->msix_id;
+ intr_ctxt.valid = true;
+ intr_ctxt.color = true;
+ ret = qdma_prog_context(qdev, QDMA_CTXT_INTR_COAL,
+ QDMA_CTXT_CLEAR, ring->ridx, NULL);
+ if (ret) {
+ qdma_err(qdev, "Failed clear intr ctx, ret %d", ret);
+ goto failed;
+ }
+
+ qdma_prep_intr_context(qdev, &intr_ctxt, ctxt);
+ ret = qdma_prog_context(qdev, QDMA_CTXT_INTR_COAL,
+ QDMA_CTXT_WRITE, ring->ridx, ctxt);
+ if (ret) {
+ qdma_err(qdev, "Failed setup intr ctx, ret %d", ret);
+ goto failed;
+ }
+
+ ret = devm_request_threaded_irq(dev, vector, NULL,
+ qdma_queue_isr, IRQF_ONESHOT,
+ "amd-qdma-queue", ring);
+ if (ret) {
+ qdma_err(qdev, "Failed to request irq %d", vector);
+ goto failed;
+ }
+ }
+
+ return 0;
+
+failed:
+ qdma_free_qintr_rings(qdev);
+ return ret;
+}
+
+static int qdma_intr_init(struct qdma_device *qdev)
+{
+ int ret;
+
+ ret = qdma_init_error_irq(qdev);
+ if (ret) {
+ qdma_err(qdev, "Failed to init error IRQs, ret %d", ret);
+ return ret;
+ }
+
+ ret = qdma_alloc_qintr_rings(qdev);
+ if (ret) {
+ qdma_err(qdev, "Failed to init queue IRQs, ret %d", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int amd_qdma_remove(struct platform_device *pdev)
+{
+ struct qdma_device *qdev = platform_get_drvdata(pdev);
+
+ qdma_sgdma_control(qdev, 0);
+
+ if (qdev->status & QDMA_DEV_STATUS_REG_DMA)
+ dma_async_device_unregister(&qdev->dma_dev);
+
+ if (qdev->status & QDMA_DEV_STATUS_INTR_INIT)
+ qdma_free_qintr_rings(qdev);
+
+ mutex_destroy(&qdev->ctxt_lock);
+
+ return 0;
+}
+
+static int amd_qdma_probe(struct platform_device *pdev)
+{
+ struct qdma_platdata *pdata = dev_get_platdata(&pdev->dev);
+ struct qdma_device *qdev;
+ struct resource *res;
+ void __iomem *regs;
+ int ret;
+
+ qdev = devm_kzalloc(&pdev->dev, sizeof(*qdev), GFP_KERNEL);
+ if (!qdev)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, qdev);
+ qdev->pdev = pdev;
+ mutex_init(&qdev->ctxt_lock);
+
+ res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!res) {
+ qdma_err(qdev, "Failed to get IRQ resource");
+ ret = -ENODEV;
+ goto failed;
+ }
+ qdev->err_irq_idx = pdata->irq_index;
+ qdev->queue_irq_start = res->start + 1;
+ qdev->queue_irq_num = res->end - res->start;
+
+ regs = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
+ if (IS_ERR(regs)) {
+ ret = PTR_ERR(regs);
+ qdma_err(qdev, "Failed to map IO resource, err %d", ret);
+ goto failed;
+ }
+
+ qdev->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
+ &qdma_regmap_config);
+ if (IS_ERR(qdev->regmap)) {
+ ret = PTR_ERR(qdev->regmap);
+ qdma_err(qdev, "Regmap init failed, err %d", ret);
+ goto failed;
+ }
+
+ ret = qdma_device_verify(qdev);
+ if (ret)
+ goto failed;
+
+ ret = qdma_get_hw_info(qdev);
+ if (ret)
+ goto failed;
+
+ INIT_LIST_HEAD(&qdev->dma_dev.channels);
+
+ ret = qdma_device_setup(qdev);
+ if (ret)
+ goto failed;
+
+ ret = qdma_intr_init(qdev);
+ if (ret) {
+ qdma_err(qdev, "Failed to initialize IRQs %d", ret);
+ return ret;
+ }
+ qdev->status |= QDMA_DEV_STATUS_INTR_INIT;
+
+ dma_cap_set(DMA_SLAVE, qdev->dma_dev.cap_mask);
+ dma_cap_set(DMA_PRIVATE, qdev->dma_dev.cap_mask);
+
+ qdev->dma_dev.dev = &pdev->dev;
+ qdev->dma_dev.filter.map = pdata->device_map;
+ qdev->dma_dev.filter.mapcnt = qdev->chan_num * 2;
+ qdev->dma_dev.filter.fn = qdma_filter_fn;
+ qdev->dma_dev.desc_metadata_modes = DESC_METADATA_ENGINE;
+ qdev->dma_dev.device_alloc_chan_resources = qdma_alloc_queue_resources;
+ qdev->dma_dev.device_free_chan_resources = qdma_free_queue_resources;
+ qdev->dma_dev.device_prep_slave_sg = qdma_prep_device_sg;
+ qdev->dma_dev.device_issue_pending = qdma_issue_pending;
+ qdev->dma_dev.device_tx_status = dma_cookie_status;
+ qdev->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
+
+ ret = dma_async_device_register(&qdev->dma_dev);
+ if (ret) {
+ qdma_err(qdev, "Failed to register AMD QDMA: %d", ret);
+ goto failed;
+ }
+ qdev->status |= QDMA_DEV_STATUS_REG_DMA;
+
+ return 0;
+failed:
+ qdma_err(qdev, "Failed to probe AMD QDMA driver");
+ amd_qdma_remove(pdev);
+ return ret;
+}
+
+static struct platform_driver amd_qdma_driver = {
+ .driver = {
+ .name = "amd-qdma",
+ },
+ .probe = amd_qdma_probe,
+ .remove = amd_qdma_remove,
+};
+
+module_platform_driver(amd_qdma_driver);
+
+MODULE_DESCRIPTION("AMD QDMA driver");
+MODULE_AUTHOR("XRT Team <runtimeca39d@xxxxxxx>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/dma/amd/qdma.h b/drivers/dma/amd/qdma.h
new file mode 100644
index 000000000000..b4a0e23d3d79
--- /dev/null
+++ b/drivers/dma/amd/qdma.h
@@ -0,0 +1,269 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * DMA header for AMD Queue-based DMA Subsystem
+ *
+ * Copyright (C) 2023, Advanced Micro Devices, Inc.
+ */
+
+#ifndef __QDMA_H
+#define __QDMA_H
+
+#include <linux/bitfield.h>
+#include <linux/dmaengine.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include "../virt-dma.h"
+
+#define DISABLE 0
+#define ENABLE 1
+
+#define QDMA_MIN_IRQ 3
+#define QDMA_INTR_NAME_MAX_LEN 30
+#define QDMA_INTR_PREFIX "amd-qdma"
+
+#define QDMA_DEV_STATUS_REG_DMA BIT(0)
+#define QDMA_DEV_STATUS_INTR_INIT BIT(1)
+
+#define QDMA_IDENTIFIER 0x1FD3
+#define QDMA_DEFAULT_RING_SIZE (BIT(10) + 1)
+#define QDMA_DEFAULT_RING_ID 0
+#define QDMA_POLL_INTRVL_US 10 /* 10us */
+#define QDMA_POLL_TIMEOUT_US (500 * 1000) /* 500ms */
+#define QDMA_DMAP_REG_STRIDE 16
+#define QDMA_CTXT_REGMAP_LEN 8 /* 8 regs */
+#define QDMA_MM_DESC_SIZE 32 /* Bytes */
+#define QDMA_MM_DESC_LEN_BITS 28
+#define QDMA_MM_DESC_MAX_LEN (BIT(QDMA_MM_DESC_LEN_BITS) - 1)
+#define QDMA_MIN_DMA_ALLOC_SIZE 4096
+#define QDMA_INTR_RING_SIZE BIT(13)
+#define QDMA_INTR_RING_IDX_MASK GENMASK(9, 0)
+#define QDMA_INTR_RING_BASE(_addr) ((_addr) >> 12)
+
+#define QDMA_IDENTIFIER_REGOFF 0x0
+#define QDMA_IDENTIFIER_MASK GENMASK(31, 16)
+#define QDMA_QUEUE_ARM_BIT BIT(16)
+
+#define qdma_err(qdev, fmt, args...) \
+ dev_err(&(qdev)->pdev->dev, fmt, ##args)
+
+#define qdma_dbg(qdev, fmt, args...) \
+ dev_dbg(&(qdev)->pdev->dev, fmt, ##args)
+
+#define qdma_info(qdev, fmt, args...) \
+ dev_info(&(qdev)->pdev->dev, fmt, ##args)
+
+enum qdma_reg_fields {
+ QDMA_REGF_IRQ_ENABLE,
+ QDMA_REGF_WBK_ENABLE,
+ QDMA_REGF_WBI_CHECK,
+ QDMA_REGF_IRQ_ARM,
+ QDMA_REGF_IRQ_VEC,
+ QDMA_REGF_IRQ_AGG,
+ QDMA_REGF_WBI_INTVL_ENABLE,
+ QDMA_REGF_MRKR_DISABLE,
+ QDMA_REGF_QUEUE_ENABLE,
+ QDMA_REGF_QUEUE_MODE,
+ QDMA_REGF_DESC_BASE,
+ QDMA_REGF_DESC_SIZE,
+ QDMA_REGF_RING_ID,
+ QDMA_REGF_CMD_INDX,
+ QDMA_REGF_CMD_CMD,
+ QDMA_REGF_CMD_TYPE,
+ QDMA_REGF_CMD_BUSY,
+ QDMA_REGF_QUEUE_COUNT,
+ QDMA_REGF_QUEUE_MAX,
+ QDMA_REGF_QUEUE_BASE,
+ QDMA_REGF_FUNCTION_ID,
+ QDMA_REGF_INTR_AGG_BASE,
+ QDMA_REGF_INTR_VECTOR,
+ QDMA_REGF_INTR_SIZE,
+ QDMA_REGF_INTR_VALID,
+ QDMA_REGF_INTR_COLOR,
+ QDMA_REGF_INTR_FUNCTION_ID,
+ QDMA_REGF_ERR_INT_FUNC,
+ QDMA_REGF_ERR_INT_VEC,
+ QDMA_REGF_ERR_INT_ARM,
+ QDMA_REGF_MAX
+};
+
+enum qdma_regs {
+ QDMA_REGO_CTXT_DATA,
+ QDMA_REGO_CTXT_CMD,
+ QDMA_REGO_CTXT_MASK,
+ QDMA_REGO_MM_H2C_CTRL,
+ QDMA_REGO_MM_C2H_CTRL,
+ QDMA_REGO_QUEUE_COUNT,
+ QDMA_REGO_RING_SIZE,
+ QDMA_REGO_H2C_PIDX,
+ QDMA_REGO_C2H_PIDX,
+ QDMA_REGO_INTR_CIDX,
+ QDMA_REGO_FUNC_ID,
+ QDMA_REGO_ERR_INT,
+ QDMA_REGO_ERR_STAT,
+ QDMA_REGO_MAX
+};
+
+struct qdma_reg_field {
+ u16 lsb; /* Least significant bit of field */
+ u16 msb; /* Most significant bit of field */
+};
+
+struct qdma_reg {
+ u32 off;
+ u32 count;
+};
+
+#define QDMA_REGF(_msb, _lsb) { \
+ .lsb = (_lsb), \
+ .msb = (_msb), \
+}
+
+#define QDMA_REGO(_off, _count) { \
+ .off = (_off), \
+ .count = (_count), \
+}
+
+enum qdma_desc_size {
+ QDMA_DESC_SIZE_8B,
+ QDMA_DESC_SIZE_16B,
+ QDMA_DESC_SIZE_32B,
+ QDMA_DESC_SIZE_64B,
+};
+
+enum qdma_queue_op_mode {
+ QDMA_QUEUE_OP_STREAM,
+ QDMA_QUEUE_OP_MM,
+};
+
+enum qdma_ctxt_type {
+ QDMA_CTXT_DESC_SW_C2H,
+ QDMA_CTXT_DESC_SW_H2C,
+ QDMA_CTXT_DESC_HW_C2H,
+ QDMA_CTXT_DESC_HW_H2C,
+ QDMA_CTXT_DESC_CR_C2H,
+ QDMA_CTXT_DESC_CR_H2C,
+ QDMA_CTXT_WRB,
+ QDMA_CTXT_PFTCH,
+ QDMA_CTXT_INTR_COAL,
+ QDMA_CTXT_RSVD,
+ QDMA_CTXT_HOST_PROFILE,
+ QDMA_CTXT_TIMER,
+ QDMA_CTXT_FMAP,
+ QDMA_CTXT_FNC_STS,
+};
+
+enum qdma_ctxt_cmd {
+ QDMA_CTXT_CLEAR,
+ QDMA_CTXT_WRITE,
+ QDMA_CTXT_READ,
+ QDMA_CTXT_INVALIDATE,
+ QDMA_CTXT_MAX
+};
+
+struct qdma_ctxt_sw_desc {
+ u64 desc_base;
+ u16 vec;
+};
+
+struct qdma_ctxt_intr {
+ u64 agg_base;
+ u16 vec;
+ u32 size;
+ bool valid;
+ bool color;
+};
+
+struct qdma_ctxt_fmap {
+ u16 qbase;
+ u16 qmax;
+};
+
+struct qdma_device;
+
+struct qdma_mm_desc {
+ __le64 src_addr;
+ __le32 len;
+ __le32 reserved1;
+ __le64 dst_addr;
+ __le64 reserved2;
+} __packed;
+
+struct qdma_mm_vdesc {
+ struct virt_dma_desc vdesc;
+ struct qdma_queue *queue;
+ struct scatterlist *sgl;
+ u64 sg_off;
+ u32 sg_len;
+ u64 dev_addr;
+ u32 pidx;
+ u32 pending_descs;
+};
+
+#define QDMA_VDESC_QUEUED(vdesc) (!(vdesc)->sg_len)
+
+struct qdma_queue {
+ struct qdma_device *qdev;
+ struct virt_dma_chan vchan;
+ enum dma_transfer_direction dir;
+ struct dma_slave_config cfg;
+ struct qdma_mm_desc *desc_base;
+ struct qdma_mm_vdesc *submitted_vdesc;
+ struct qdma_mm_vdesc *issued_vdesc;
+ dma_addr_t dma_desc_base;
+ u32 pidx_reg;
+ u32 cidx_reg;
+ u32 ring_size;
+ u32 idx_mask;
+ u16 qid;
+ u32 pidx;
+ u32 cidx;
+};
+
+struct qdma_intr_ring {
+ struct qdma_device *qdev;
+ __le64 *base;
+ dma_addr_t dev_base;
+ char msix_name[QDMA_INTR_NAME_MAX_LEN];
+ u32 msix_vector;
+ u16 msix_id;
+ u32 ring_size;
+ u16 ridx;
+ u16 cidx;
+ u8 color;
+};
+
+#define QDMA_INTR_MASK_PIDX GENMASK_ULL(15, 0)
+#define QDMA_INTR_MASK_CIDX GENMASK_ULL(31, 16)
+#define QDMA_INTR_MASK_DESC_COLOR GENMASK_ULL(32, 32)
+#define QDMA_INTR_MASK_STATE GENMASK_ULL(34, 33)
+#define QDMA_INTR_MASK_ERROR GENMASK_ULL(36, 35)
+#define QDMA_INTR_MASK_TYPE GENMASK_ULL(38, 38)
+#define QDMA_INTR_MASK_QID GENMASK_ULL(62, 39)
+#define QDMA_INTR_MASK_COLOR GENMASK_ULL(63, 63)
+
+struct qdma_device {
+ struct platform_device *pdev;
+ struct dma_device dma_dev;
+ struct regmap *regmap;
+ struct mutex ctxt_lock; /* protect ctxt registers */
+ const struct qdma_reg_field *rfields;
+ const struct qdma_reg *roffs;
+ struct qdma_queue *h2c_queues;
+ struct qdma_queue *c2h_queues;
+ struct qdma_intr_ring *qintr_rings;
+ u32 qintr_ring_num;
+ u32 qintr_ring_idx;
+ u32 chan_num;
+ u32 queue_irq_start;
+ u32 queue_irq_num;
+ u32 err_irq_idx;
+ u32 fid;
+ u32 status;
+};
+
+extern const struct qdma_reg qdma_regos_default[QDMA_REGO_MAX];
+extern const struct qdma_reg_field qdma_regfs_default[QDMA_REGF_MAX];
+
+#endif /* __QDMA_H */
diff --git a/include/linux/platform_data/amd_qdma.h b/include/linux/platform_data/amd_qdma.h
new file mode 100644
index 000000000000..59fa0c174f70
--- /dev/null
+++ b/include/linux/platform_data/amd_qdma.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2023, Advanced Micro Devices, Inc.
+ */
+
+#ifndef _PLATDATA_AMD_QDMA_H
+#define _PLATDATA_AMD_QDMA_H
+
+#include <linux/dmaengine.h>
+
+/**
+ * struct qdma_queue_info - DMA queue information. This information is used to
+ * match queue when DMA channel is requested
+ * @dir: Channel transfer direction
+ */
+struct qdma_queue_info {
+ enum dma_transfer_direction dir;
+};
+
+#define QDMA_FILTER_PARAM(qinfo) ((void *)(qinfo))
+
+struct dma_slave_map;
+
+/**
+ * struct qdma_platdata - Platform specific data for QDMA engine
+ * @max_mm_channels: Maximum number of MM DMA channels in each direction
+ * @device_map: DMA slave map
+ * @irq_index: The index of first IRQ
+ */
+struct qdma_platdata {
+ u32 max_mm_channels;
+ u32 irq_index;
+ struct dma_slave_map *device_map;
+};
+
+#endif /* _PLATDATA_AMD_QDMA_H */
--
2.34.1
