[PATCH v6 09/17] dmaengine: ti: New driver for K3 UDMA - split#1: defines, structs, io func

[Peter Ujfalusi]

Split patch for review containing: defines, structs, io and low level
functions and interrupt callbacks.

DMA driver for
Texas Instruments K3 NAVSS Unified DMA â Peripheral Root Complex (UDMA-P)

The UDMA-P is intended to perform similar (but significantly upgraded) functions
as the packet-oriented DMA used on previous SoC devices. The UDMA-P module
supports the transmission and reception of various packet types. The UDMA-P is
architected to facilitate the segmentation and reassembly of SoC DMA data
structure compliant packets to/from smaller data blocks that are natively
compatible with the specific requirements of each connected peripheral. Multiple
Tx and Rx channels are provided within the DMA which allow multiple segmentation
or reassembly operations to be ongoing. The DMA controller maintains state
information for each of the channels which allows packet segmentation and
reassembly operations to be time division multiplexed between channels in order
to share the underlying DMA hardware. An external DMA scheduler is used to
control the ordering and rate at which this multiplexing occurs for Transmit
operations. The ordering and rate of Receive operations is indirectly controlled
by the order in which blocks are pushed into the DMA on the Rx PSI-L interface.

The UDMA-P also supports acting as both a UTC and UDMA-C for its internal
channels. Channels in the UDMA-P can be configured to be either Packet-Based or
Third-Party channels on a channel by channel basis.

The initial driver supports:
- MEM_TO_MEM (TR mode)
- DEV_TO_MEM (Packet / TR mode)
- MEM_TO_DEV (Packet / TR mode)
- Cyclic (Packet / TR mode)
- Metadata for descriptors

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
---
 drivers/dma/ti/k3-udma.c | 1049 ++++++++++++++++++++++++++++++++++++++
 drivers/dma/ti/k3-udma.h |  120 +++++
 2 files changed, 1169 insertions(+)
 create mode 100644 drivers/dma/ti/k3-udma.c
 create mode 100644 drivers/dma/ti/k3-udma.h

diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
new file mode 100644
index 000000000000..0f7e56f04a56
--- /dev/null
+++ b/drivers/dma/ti/k3-udma.c
@@ -0,0 +1,1049 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
+ *  Author: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
+ */
+
+#include <linux/kernel.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/of.h>
+#include <linux/of_dma.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/workqueue.h>
+#include <linux/completion.h>
+#include <linux/soc/ti/k3-ringacc.h>
+#include <linux/soc/ti/ti_sci_protocol.h>
+#include <linux/soc/ti/ti_sci_inta_msi.h>
+#include <linux/dma/ti-cppi5.h>
+
+#include "../virt-dma.h"
+#include "k3-udma.h"
+#include "k3-psil-priv.h"
+
+struct udma_static_tr {
+	u8 elsize; /* RPSTR0 */
+	u16 elcnt; /* RPSTR0 */
+	u16 bstcnt; /* RPSTR1 */
+};
+
+#define K3_UDMA_MAX_RFLOWS		1024
+#define K3_UDMA_DEFAULT_RING_SIZE	16
+
+/* How SRC/DST tag should be updated by UDMA in the descriptor's Word 3 */
+#define UDMA_RFLOW_SRCTAG_NONE		0
+#define UDMA_RFLOW_SRCTAG_CFG_TAG	1
+#define UDMA_RFLOW_SRCTAG_FLOW_ID	2
+#define UDMA_RFLOW_SRCTAG_SRC_TAG	4
+
+#define UDMA_RFLOW_DSTTAG_NONE		0
+#define UDMA_RFLOW_DSTTAG_CFG_TAG	1
+#define UDMA_RFLOW_DSTTAG_FLOW_ID	2
+#define UDMA_RFLOW_DSTTAG_DST_TAG_LO	4
+#define UDMA_RFLOW_DSTTAG_DST_TAG_HI	5
+
+struct udma_chan;
+
+enum udma_mmr {
+	MMR_GCFG = 0,
+	MMR_RCHANRT,
+	MMR_TCHANRT,
+	MMR_LAST,
+};
+
+static const char * const mmr_names[] = { "gcfg", "rchanrt", "tchanrt" };
+
+struct udma_tchan {
+	void __iomem *reg_rt;
+
+	int id;
+	struct k3_ring *t_ring; /* Transmit ring */
+	struct k3_ring *tc_ring; /* Transmit Completion ring */
+};
+
+struct udma_rflow {
+	int id;
+	struct k3_ring *fd_ring; /* Free Descriptor ring */
+	struct k3_ring *r_ring; /* Receive ring */
+};
+
+struct udma_rchan {
+	void __iomem *reg_rt;
+
+	int id;
+};
+
+#define UDMA_FLAG_PDMA_ACC32		BIT(0)
+#define UDMA_FLAG_PDMA_BURST		BIT(1)
+
+struct udma_match_data {
+	u32 psil_base;
+	bool enable_memcpy_support;
+	u32 flags;
+	u32 statictr_z_mask;
+	u32 rchan_oes_offset;
+
+	u8 tpl_levels;
+	u32 level_start_idx[];
+};
+
+struct udma_dev {
+	struct dma_device ddev;
+	struct device *dev;
+	void __iomem *mmrs[MMR_LAST];
+	const struct udma_match_data *match_data;
+
+	size_t desc_align; /* alignment to use for descriptors */
+
+	struct udma_tisci_rm tisci_rm;
+
+	struct k3_ringacc *ringacc;
+
+	struct work_struct purge_work;
+	struct list_head desc_to_purge;
+	spinlock_t lock;
+
+	int tchan_cnt;
+	int echan_cnt;
+	int rchan_cnt;
+	int rflow_cnt;
+	unsigned long *tchan_map;
+	unsigned long *rchan_map;
+	unsigned long *rflow_gp_map;
+	unsigned long *rflow_gp_map_allocated;
+	unsigned long *rflow_in_use;
+
+	struct udma_tchan *tchans;
+	struct udma_rchan *rchans;
+	struct udma_rflow *rflows;
+
+	struct udma_chan *channels;
+	u32 psil_base;
+};
+
+struct udma_hwdesc {
+	size_t cppi5_desc_size;
+	void *cppi5_desc_vaddr;
+	dma_addr_t cppi5_desc_paddr;
+
+	/* TR descriptor internal pointers */
+	void *tr_req_base;
+	struct cppi5_tr_resp_t *tr_resp_base;
+};
+
+struct udma_desc {
+	struct virt_dma_desc vd;
+
+	bool terminated;
+
+	enum dma_transfer_direction dir;
+
+	struct udma_static_tr static_tr;
+	u32 residue;
+
+	unsigned int sglen;
+	unsigned int desc_idx; /* Only used for cyclic in packet mode */
+	unsigned int tr_idx;
+
+	u32 metadata_size;
+	void *metadata; /* pointer to provided metadata buffer (EPIP, PSdata) */
+
+	unsigned int hwdesc_count;
+	struct udma_hwdesc hwdesc[0];
+};
+
+enum udma_chan_state {
+	UDMA_CHAN_IS_IDLE = 0, /* not active, no teardown is in progress */
+	UDMA_CHAN_IS_ACTIVE, /* Normal operation */
+	UDMA_CHAN_IS_ACTIVE_FLUSH, /* Flushing for delayed tx */
+	UDMA_CHAN_IS_TERMINATING, /* channel is being terminated */
+};
+
+struct udma_chan {
+	struct virt_dma_chan vc;
+	struct dma_slave_config	cfg;
+	struct udma_dev *ud;
+	struct udma_desc *desc;
+	struct udma_desc *terminated_desc;
+	struct udma_static_tr static_tr;
+	char *name;
+
+	struct udma_tchan *tchan;
+	struct udma_rchan *rchan;
+	struct udma_rflow *rflow;
+
+	bool psil_paired;
+
+	int irq_num_ring;
+	int irq_num_udma;
+
+	bool cyclic;
+	bool paused;
+
+	enum udma_chan_state state;
+	struct completion teardown_completed;
+
+	u32 bcnt; /* number of bytes completed since the start of the channel */
+	u32 in_ring_cnt; /* number of descriptors in flight */
+
+	bool pkt_mode; /* TR or packet */
+	bool needs_epib; /* EPIB is needed for the communication or not */
+	u32 psd_size; /* size of Protocol Specific Data */
+	u32 metadata_size; /* (needs_epib ? 16:0) + psd_size */
+	u32 hdesc_size; /* Size of a packet descriptor in packet mode */
+	bool notdpkt; /* Suppress sending TDC packet */
+	int remote_thread_id;
+	u32 src_thread;
+	u32 dst_thread;
+	enum psil_endpoint_type ep_type;
+	bool enable_acc32;
+	bool enable_burst;
+	enum udma_tp_level channel_tpl; /* Channel Throughput Level */
+
+	/* dmapool for packet mode descriptors */
+	bool use_dma_pool;
+	struct dma_pool *hdesc_pool;
+
+	u32 id;
+	enum dma_transfer_direction dir;
+};
+
+static inline struct udma_dev *to_udma_dev(struct dma_device *d)
+{
+	return container_of(d, struct udma_dev, ddev);
+}
+
+static inline struct udma_chan *to_udma_chan(struct dma_chan *c)
+{
+	return container_of(c, struct udma_chan, vc.chan);
+}
+
+static inline struct udma_desc *to_udma_desc(struct dma_async_tx_descriptor *t)
+{
+	return container_of(t, struct udma_desc, vd.tx);
+}
+
+/* Generic register access functions */
+static inline u32 udma_read(void __iomem *base, int reg)
+{
+	return readl(base + reg);
+}
+
+static inline void udma_write(void __iomem *base, int reg, u32 val)
+{
+	writel(val, base + reg);
+}
+
+static inline void udma_update_bits(void __iomem *base, int reg,
+				    u32 mask, u32 val)
+{
+	u32 tmp, orig;
+
+	orig = readl(base + reg);
+	tmp = orig & ~mask;
+	tmp |= (val & mask);
+
+	if (tmp != orig)
+		writel(tmp, base + reg);
+}
+
+/* TCHANRT */
+static inline u32 udma_tchanrt_read(struct udma_tchan *tchan, int reg)
+{
+	if (!tchan)
+		return 0;
+	return udma_read(tchan->reg_rt, reg);
+}
+
+static inline void udma_tchanrt_write(struct udma_tchan *tchan, int reg,
+				      u32 val)
+{
+	if (!tchan)
+		return;
+	udma_write(tchan->reg_rt, reg, val);
+}
+
+static inline void udma_tchanrt_update_bits(struct udma_tchan *tchan, int reg,
+					    u32 mask, u32 val)
+{
+	if (!tchan)
+		return;
+	udma_update_bits(tchan->reg_rt, reg, mask, val);
+}
+
+/* RCHANRT */
+static inline u32 udma_rchanrt_read(struct udma_rchan *rchan, int reg)
+{
+	if (!rchan)
+		return 0;
+	return udma_read(rchan->reg_rt, reg);
+}
+
+static inline void udma_rchanrt_write(struct udma_rchan *rchan, int reg,
+				      u32 val)
+{
+	if (!rchan)
+		return;
+	udma_write(rchan->reg_rt, reg, val);
+}
+
+static inline void udma_rchanrt_update_bits(struct udma_rchan *rchan, int reg,
+					    u32 mask, u32 val)
+{
+	if (!rchan)
+		return;
+	udma_update_bits(rchan->reg_rt, reg, mask, val);
+}
+
+static int navss_psil_pair(struct udma_dev *ud, u32 src_thread, u32 dst_thread)
+{
+	struct udma_tisci_rm *tisci_rm = &ud->tisci_rm;
+
+	dst_thread |= K3_PSIL_DST_THREAD_ID_OFFSET;
+	return tisci_rm->tisci_psil_ops->pair(tisci_rm->tisci,
+					      tisci_rm->tisci_navss_dev_id,
+					      src_thread, dst_thread);
+}
+
+static int navss_psil_unpair(struct udma_dev *ud, u32 src_thread,
+			     u32 dst_thread)
+{
+	struct udma_tisci_rm *tisci_rm = &ud->tisci_rm;
+
+	dst_thread |= K3_PSIL_DST_THREAD_ID_OFFSET;
+	return tisci_rm->tisci_psil_ops->unpair(tisci_rm->tisci,
+						tisci_rm->tisci_navss_dev_id,
+						src_thread, dst_thread);
+}
+
+static char *udma_get_dir_text(enum dma_transfer_direction dir)
+{
+	switch (dir) {
+	case DMA_DEV_TO_MEM:
+		return "DEV_TO_MEM";
+	case DMA_MEM_TO_DEV:
+		return "MEM_TO_DEV";
+	case DMA_MEM_TO_MEM:
+		return "MEM_TO_MEM";
+	case DMA_DEV_TO_DEV:
+		return "DEV_TO_DEV";
+	default:
+		break;
+	}
+
+	return "invalid";
+}
+
+static void udma_reset_uchan(struct udma_chan *uc)
+{
+	uc->state = UDMA_CHAN_IS_IDLE;
+	uc->remote_thread_id = -1;
+	uc->dir = DMA_MEM_TO_MEM;
+	uc->pkt_mode = false;
+	uc->ep_type = PSIL_EP_NATIVE;
+	uc->enable_acc32 = 0;
+	uc->enable_burst = 0;
+	uc->channel_tpl = 0;
+	uc->psd_size = 0;
+	uc->metadata_size = 0;
+	uc->hdesc_size = 0;
+	uc->notdpkt = 0;
+}
+
+static void udma_dump_chan_stdata(struct udma_chan *uc)
+{
+	struct device *dev = uc->ud->dev;
+	u32 offset;
+	int i;
+
+	if (uc->dir == DMA_MEM_TO_DEV || uc->dir == DMA_MEM_TO_MEM) {
+		dev_dbg(dev, "TCHAN State data:\n");
+		for (i = 0; i < 32; i++) {
+			offset = UDMA_TCHAN_RT_STDATA_REG + i * 4;
+			dev_dbg(dev, "TRT_STDATA[%02d]: 0x%08x\n", i,
+				udma_tchanrt_read(uc->tchan, offset));
+		}
+	}
+
+	if (uc->dir == DMA_DEV_TO_MEM || uc->dir == DMA_MEM_TO_MEM) {
+		dev_dbg(dev, "RCHAN State data:\n");
+		for (i = 0; i < 32; i++) {
+			offset = UDMA_RCHAN_RT_STDATA_REG + i * 4;
+			dev_dbg(dev, "RRT_STDATA[%02d]: 0x%08x\n", i,
+				udma_rchanrt_read(uc->rchan, offset));
+		}
+	}
+}
+
+static inline dma_addr_t udma_curr_cppi5_desc_paddr(struct udma_desc *d,
+						    int idx)
+{
+	return d->hwdesc[idx].cppi5_desc_paddr;
+}
+
+static inline void *udma_curr_cppi5_desc_vaddr(struct udma_desc *d, int idx)
+{
+	return d->hwdesc[idx].cppi5_desc_vaddr;
+}
+
+static struct udma_desc *udma_udma_desc_from_paddr(struct udma_chan *uc,
+						   dma_addr_t paddr)
+{
+	struct udma_desc *d = uc->terminated_desc;
+
+	if (d) {
+		dma_addr_t desc_paddr = udma_curr_cppi5_desc_paddr(d,
+								   d->desc_idx);
+
+		if (desc_paddr != paddr)
+			d = NULL;
+	}
+
+	if (!d) {
+		d = uc->desc;
+		if (d) {
+			dma_addr_t desc_paddr = udma_curr_cppi5_desc_paddr(d,
+								d->desc_idx);
+
+			if (desc_paddr != paddr)
+				d = NULL;
+		}
+	}
+
+	return d;
+}
+
+static void udma_free_hwdesc(struct udma_chan *uc, struct udma_desc *d)
+{
+	if (uc->use_dma_pool) {
+		int i;
+
+		for (i = 0; i < d->hwdesc_count; i++) {
+			if (!d->hwdesc[i].cppi5_desc_vaddr)
+				continue;
+
+			dma_pool_free(uc->hdesc_pool,
+				      d->hwdesc[i].cppi5_desc_vaddr,
+				      d->hwdesc[i].cppi5_desc_paddr);
+
+			d->hwdesc[i].cppi5_desc_vaddr = NULL;
+		}
+	} else if (d->hwdesc[0].cppi5_desc_vaddr) {
+		struct udma_dev *ud = uc->ud;
+
+		dma_free_coherent(ud->dev, d->hwdesc[0].cppi5_desc_size,
+				  d->hwdesc[0].cppi5_desc_vaddr,
+				  d->hwdesc[0].cppi5_desc_paddr);
+
+		d->hwdesc[0].cppi5_desc_vaddr = NULL;
+	}
+}
+
+static void udma_purge_desc_work(struct work_struct *work)
+{
+	struct udma_dev *ud = container_of(work, typeof(*ud), purge_work);
+	struct virt_dma_desc *vd, *_vd;
+	unsigned long flags;
+	LIST_HEAD(head);
+
+	spin_lock_irqsave(&ud->lock, flags);
+	list_splice_tail_init(&ud->desc_to_purge, &head);
+	spin_unlock_irqrestore(&ud->lock, flags);
+
+	list_for_each_entry_safe(vd, _vd, &head, node) {
+		struct udma_chan *uc = to_udma_chan(vd->tx.chan);
+		struct udma_desc *d = to_udma_desc(&vd->tx);
+
+		udma_free_hwdesc(uc, d);
+		list_del(&vd->node);
+		kfree(d);
+	}
+
+	/* If more to purge, schedule the work again */
+	if (!list_empty(&ud->desc_to_purge))
+		schedule_work(&ud->purge_work);
+}
+
+static void udma_desc_free(struct virt_dma_desc *vd)
+{
+	struct udma_dev *ud = to_udma_dev(vd->tx.chan->device);
+	struct udma_chan *uc = to_udma_chan(vd->tx.chan);
+	struct udma_desc *d = to_udma_desc(&vd->tx);
+	unsigned long flags;
+
+	if (uc->terminated_desc == d)
+		uc->terminated_desc = NULL;
+
+	if (uc->use_dma_pool) {
+		udma_free_hwdesc(uc, d);
+		kfree(d);
+		return;
+	}
+
+	spin_lock_irqsave(&ud->lock, flags);
+	list_add_tail(&vd->node, &ud->desc_to_purge);
+	spin_unlock_irqrestore(&ud->lock, flags);
+
+	schedule_work(&ud->purge_work);
+}
+
+static bool udma_is_chan_running(struct udma_chan *uc)
+{
+	u32 trt_ctl = 0;
+	u32 rrt_ctl = 0;
+
+	if (uc->tchan)
+		trt_ctl = udma_tchanrt_read(uc->tchan, UDMA_TCHAN_RT_CTL_REG);
+	if (uc->rchan)
+		rrt_ctl = udma_rchanrt_read(uc->rchan, UDMA_RCHAN_RT_CTL_REG);
+
+	if (trt_ctl & UDMA_CHAN_RT_CTL_EN || rrt_ctl & UDMA_CHAN_RT_CTL_EN)
+		return true;
+
+	return false;
+}
+
+static void udma_sync_for_device(struct udma_chan *uc, int idx)
+{
+	struct udma_desc *d = uc->desc;
+
+	if (uc->cyclic && uc->pkt_mode) {
+		dma_sync_single_for_device(uc->ud->dev,
+					   d->hwdesc[idx].cppi5_desc_paddr,
+					   d->hwdesc[idx].cppi5_desc_size,
+					   DMA_TO_DEVICE);
+	} else {
+		int i;
+
+		for (i = 0; i < d->hwdesc_count; i++) {
+			if (!d->hwdesc[i].cppi5_desc_vaddr)
+				continue;
+
+			dma_sync_single_for_device(uc->ud->dev,
+						d->hwdesc[i].cppi5_desc_paddr,
+						d->hwdesc[i].cppi5_desc_size,
+						DMA_TO_DEVICE);
+		}
+	}
+}
+
+static int udma_push_to_ring(struct udma_chan *uc, int idx)
+{
+	struct udma_desc *d = uc->desc;
+
+	struct k3_ring *ring = NULL;
+	int ret = -EINVAL;
+
+	switch (uc->dir) {
+	case DMA_DEV_TO_MEM:
+		ring = uc->rflow->fd_ring;
+		break;
+	case DMA_MEM_TO_DEV:
+	case DMA_MEM_TO_MEM:
+		ring = uc->tchan->t_ring;
+		break;
+	default:
+		break;
+	}
+
+	if (ring) {
+		dma_addr_t desc_addr = udma_curr_cppi5_desc_paddr(d, idx);
+
+		wmb(); /* Ensure that writes are not moved over this point */
+		udma_sync_for_device(uc, idx);
+		ret = k3_ringacc_ring_push(ring, &desc_addr);
+		uc->in_ring_cnt++;
+	}
+
+	return ret;
+}
+
+static int udma_pop_from_ring(struct udma_chan *uc, dma_addr_t *addr)
+{
+	struct k3_ring *ring = NULL;
+	int ret = -ENOENT;
+
+	switch (uc->dir) {
+	case DMA_DEV_TO_MEM:
+		ring = uc->rflow->r_ring;
+		break;
+	case DMA_MEM_TO_DEV:
+	case DMA_MEM_TO_MEM:
+		ring = uc->tchan->tc_ring;
+		break;
+	default:
+		break;
+	}
+
+	if (ring && k3_ringacc_ring_get_occ(ring)) {
+		struct udma_desc *d = NULL;
+
+		ret = k3_ringacc_ring_pop(ring, addr);
+		if (ret)
+			return ret;
+
+		/* Teardown completion */
+		if (cppi5_desc_is_tdcm(*addr))
+			return ret;
+
+		d = udma_udma_desc_from_paddr(uc, *addr);
+
+		if (d)
+			dma_sync_single_for_cpu(uc->ud->dev, *addr,
+						d->hwdesc[0].cppi5_desc_size,
+						DMA_FROM_DEVICE);
+		rmb(); /* Ensure that reads are not moved before this point */
+
+		if (!ret)
+			uc->in_ring_cnt--;
+	}
+
+	return ret;
+}
+
+static void udma_reset_rings(struct udma_chan *uc)
+{
+	struct k3_ring *ring1 = NULL;
+	struct k3_ring *ring2 = NULL;
+
+	switch (uc->dir) {
+	case DMA_DEV_TO_MEM:
+		if (uc->rchan) {
+			ring1 = uc->rflow->fd_ring;
+			ring2 = uc->rflow->r_ring;
+		}
+		break;
+	case DMA_MEM_TO_DEV:
+	case DMA_MEM_TO_MEM:
+		if (uc->tchan) {
+			ring1 = uc->tchan->t_ring;
+			ring2 = uc->tchan->tc_ring;
+		}
+		break;
+	default:
+		break;
+	}
+
+	if (ring1)
+		k3_ringacc_ring_reset_dma(ring1,
+					  k3_ringacc_ring_get_occ(ring1));
+	if (ring2)
+		k3_ringacc_ring_reset(ring2);
+
+	/* make sure we are not leaking memory by stalled descriptor */
+	if (uc->terminated_desc) {
+		udma_desc_free(&uc->terminated_desc->vd);
+		uc->terminated_desc = NULL;
+	}
+
+	uc->in_ring_cnt = 0;
+}
+
+static void udma_reset_counters(struct udma_chan *uc)
+{
+	u32 val;
+
+	if (uc->tchan) {
+		val = udma_tchanrt_read(uc->tchan, UDMA_TCHAN_RT_BCNT_REG);
+		udma_tchanrt_write(uc->tchan, UDMA_TCHAN_RT_BCNT_REG, val);
+
+		val = udma_tchanrt_read(uc->tchan, UDMA_TCHAN_RT_SBCNT_REG);
+		udma_tchanrt_write(uc->tchan, UDMA_TCHAN_RT_SBCNT_REG, val);
+
+		val = udma_tchanrt_read(uc->tchan, UDMA_TCHAN_RT_PCNT_REG);
+		udma_tchanrt_write(uc->tchan, UDMA_TCHAN_RT_PCNT_REG, val);
+
+		val = udma_tchanrt_read(uc->tchan, UDMA_TCHAN_RT_PEER_BCNT_REG);
+		udma_tchanrt_write(uc->tchan, UDMA_TCHAN_RT_PEER_BCNT_REG, val);
+	}
+
+	if (uc->rchan) {
+		val = udma_rchanrt_read(uc->rchan, UDMA_RCHAN_RT_BCNT_REG);
+		udma_rchanrt_write(uc->rchan, UDMA_RCHAN_RT_BCNT_REG, val);
+
+		val = udma_rchanrt_read(uc->rchan, UDMA_RCHAN_RT_SBCNT_REG);
+		udma_rchanrt_write(uc->rchan, UDMA_RCHAN_RT_SBCNT_REG, val);
+
+		val = udma_rchanrt_read(uc->rchan, UDMA_RCHAN_RT_PCNT_REG);
+		udma_rchanrt_write(uc->rchan, UDMA_RCHAN_RT_PCNT_REG, val);
+
+		val = udma_rchanrt_read(uc->rchan, UDMA_RCHAN_RT_PEER_BCNT_REG);
+		udma_rchanrt_write(uc->rchan, UDMA_RCHAN_RT_PEER_BCNT_REG, val);
+	}
+
+	uc->bcnt = 0;
+}
+
+static int udma_reset_chan(struct udma_chan *uc, bool hard)
+{
+	switch (uc->dir) {
+	case DMA_DEV_TO_MEM:
+		udma_rchanrt_write(uc->rchan, UDMA_RCHAN_RT_PEER_RT_EN_REG, 0);
+		udma_rchanrt_write(uc->rchan, UDMA_RCHAN_RT_CTL_REG, 0);
+		break;
+	case DMA_MEM_TO_DEV:
+		udma_tchanrt_write(uc->tchan, UDMA_TCHAN_RT_CTL_REG, 0);
+		udma_tchanrt_write(uc->tchan, UDMA_TCHAN_RT_PEER_RT_EN_REG, 0);
+		break;
+	case DMA_MEM_TO_MEM:
+		udma_rchanrt_write(uc->rchan, UDMA_RCHAN_RT_CTL_REG, 0);
+		udma_tchanrt_write(uc->tchan, UDMA_TCHAN_RT_CTL_REG, 0);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* Reset all counters */
+	udma_reset_counters(uc);
+
+	/* Hard reset: re-initialize the channel to reset */
+	if (hard) {
+		struct udma_chan uc_backup = *uc;
+		int ret;
+
+		uc->ud->ddev.device_free_chan_resources(&uc->vc.chan);
+		/* restore the channel configuration */
+		uc->dir = uc_backup.dir;
+		uc->remote_thread_id = uc_backup.remote_thread_id;
+		uc->pkt_mode = uc_backup.pkt_mode;
+		uc->ep_type = uc_backup.ep_type;
+		uc->enable_acc32 = uc_backup.enable_acc32;
+		uc->enable_burst = uc_backup.enable_burst;
+		uc->channel_tpl = uc_backup.channel_tpl;
+		uc->psd_size = uc_backup.psd_size;
+		uc->metadata_size = uc_backup.metadata_size;
+		uc->hdesc_size = uc_backup.hdesc_size;
+		uc->notdpkt = uc_backup.notdpkt;
+
+		ret = uc->ud->ddev.device_alloc_chan_resources(&uc->vc.chan);
+		if (ret)
+			return ret;
+	}
+	uc->state = UDMA_CHAN_IS_IDLE;
+
+	return 0;
+}
+
+static void udma_start_desc(struct udma_chan *uc)
+{
+	if (uc->pkt_mode && (uc->cyclic || uc->dir == DMA_DEV_TO_MEM)) {
+		int i;
+
+		/* Push all descriptors to ring for packet mode cyclic or RX */
+		for (i = 0; i < uc->desc->sglen; i++)
+			udma_push_to_ring(uc, i);
+	} else {
+		udma_push_to_ring(uc, 0);
+	}
+}
+
+static bool udma_chan_needs_reconfiguration(struct udma_chan *uc)
+{
+	/* Only PDMAs have staticTR */
+	if (uc->ep_type == PSIL_EP_NATIVE)
+		return false;
+
+	/* Check if the staticTR configuration has changed for TX */
+	if (memcmp(&uc->static_tr, &uc->desc->static_tr, sizeof(uc->static_tr)))
+		return true;
+
+	return false;
+}
+
+static int udma_start(struct udma_chan *uc)
+{
+	struct virt_dma_desc *vd = vchan_next_desc(&uc->vc);
+
+	if (!vd) {
+		uc->desc = NULL;
+		return -ENOENT;
+	}
+
+	list_del(&vd->node);
+
+	uc->desc = to_udma_desc(&vd->tx);
+
+	/* Channel is already running and does not need reconfiguration */
+	if (udma_is_chan_running(uc) && !udma_chan_needs_reconfiguration(uc)) {
+		udma_start_desc(uc);
+		goto out;
+	}
+
+	/* Make sure that we clear the teardown bit, if it is set */
+	udma_reset_chan(uc, false);
+
+	/* Push descriptors before we start the channel */
+	udma_start_desc(uc);
+
+	switch (uc->desc->dir) {
+	case DMA_DEV_TO_MEM:
+		/* Config remote TR */
+		if (uc->ep_type == PSIL_EP_PDMA_XY) {
+			u32 val = PDMA_STATIC_TR_Y(uc->desc->static_tr.elcnt) |
+				  PDMA_STATIC_TR_X(uc->desc->static_tr.elsize);
+			const struct udma_match_data *match_data =
+							uc->ud->match_data;
+
+			if (uc->enable_acc32)
+				val |= PDMA_STATIC_TR_XY_ACC32;
+			if (uc->enable_burst)
+				val |= PDMA_STATIC_TR_XY_BURST;
+
+			udma_rchanrt_write(uc->rchan,
+				UDMA_RCHAN_RT_PEER_STATIC_TR_XY_REG, val);
+
+			udma_rchanrt_write(uc->rchan,
+				UDMA_RCHAN_RT_PEER_STATIC_TR_Z_REG,
+				PDMA_STATIC_TR_Z(uc->desc->static_tr.bstcnt,
+						 match_data->statictr_z_mask));
+
+			/* save the current staticTR configuration */
+			memcpy(&uc->static_tr, &uc->desc->static_tr,
+			       sizeof(uc->static_tr));
+		}
+
+		udma_rchanrt_write(uc->rchan, UDMA_RCHAN_RT_CTL_REG,
+				   UDMA_CHAN_RT_CTL_EN);
+
+		/* Enable remote */
+		udma_rchanrt_write(uc->rchan, UDMA_RCHAN_RT_PEER_RT_EN_REG,
+				   UDMA_PEER_RT_EN_ENABLE);
+
+		break;
+	case DMA_MEM_TO_DEV:
+		/* Config remote TR */
+		if (uc->ep_type == PSIL_EP_PDMA_XY) {
+			u32 val = PDMA_STATIC_TR_Y(uc->desc->static_tr.elcnt) |
+				  PDMA_STATIC_TR_X(uc->desc->static_tr.elsize);
+
+			if (uc->enable_acc32)
+				val |= PDMA_STATIC_TR_XY_ACC32;
+			if (uc->enable_burst)
+				val |= PDMA_STATIC_TR_XY_BURST;
+
+			udma_tchanrt_write(uc->tchan,
+				UDMA_TCHAN_RT_PEER_STATIC_TR_XY_REG, val);
+
+			/* save the current staticTR configuration */
+			memcpy(&uc->static_tr, &uc->desc->static_tr,
+			       sizeof(uc->static_tr));
+		}
+
+		/* Enable remote */
+		udma_tchanrt_write(uc->tchan, UDMA_TCHAN_RT_PEER_RT_EN_REG,
+				   UDMA_PEER_RT_EN_ENABLE);
+
+		udma_tchanrt_write(uc->tchan, UDMA_TCHAN_RT_CTL_REG,
+				   UDMA_CHAN_RT_CTL_EN);
+
+		break;
+	case DMA_MEM_TO_MEM:
+		udma_rchanrt_write(uc->rchan, UDMA_RCHAN_RT_CTL_REG,
+				   UDMA_CHAN_RT_CTL_EN);
+		udma_tchanrt_write(uc->tchan, UDMA_TCHAN_RT_CTL_REG,
+				   UDMA_CHAN_RT_CTL_EN);
+
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	uc->state = UDMA_CHAN_IS_ACTIVE;
+out:
+
+	return 0;
+}
+
+static int udma_stop(struct udma_chan *uc)
+{
+	enum udma_chan_state old_state = uc->state;
+
+	uc->state = UDMA_CHAN_IS_TERMINATING;
+	reinit_completion(&uc->teardown_completed);
+
+	switch (uc->dir) {
+	case DMA_DEV_TO_MEM:
+		udma_rchanrt_write(uc->rchan, UDMA_RCHAN_RT_PEER_RT_EN_REG,
+				   UDMA_PEER_RT_EN_ENABLE |
+				   UDMA_PEER_RT_EN_TEARDOWN);
+		break;
+	case DMA_MEM_TO_DEV:
+		udma_tchanrt_write(uc->tchan, UDMA_TCHAN_RT_PEER_RT_EN_REG,
+				   UDMA_PEER_RT_EN_ENABLE |
+				   UDMA_PEER_RT_EN_FLUSH);
+		udma_tchanrt_write(uc->tchan, UDMA_TCHAN_RT_CTL_REG,
+				   UDMA_CHAN_RT_CTL_EN |
+				   UDMA_CHAN_RT_CTL_TDOWN);
+		break;
+	case DMA_MEM_TO_MEM:
+		udma_tchanrt_write(uc->tchan, UDMA_TCHAN_RT_CTL_REG,
+				   UDMA_CHAN_RT_CTL_EN |
+				   UDMA_CHAN_RT_CTL_TDOWN);
+		break;
+	default:
+		uc->state = old_state;
+		complete_all(&uc->teardown_completed);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void udma_cyclic_packet_elapsed(struct udma_chan *uc)
+{
+	struct udma_desc *d = uc->desc;
+	struct cppi5_host_desc_t *h_desc;
+
+	h_desc = d->hwdesc[d->desc_idx].cppi5_desc_vaddr;
+	cppi5_hdesc_reset_to_original(h_desc);
+	udma_push_to_ring(uc, d->desc_idx);
+	d->desc_idx = (d->desc_idx + 1) % d->sglen;
+}
+
+static inline void udma_fetch_epib(struct udma_chan *uc, struct udma_desc *d)
+{
+	struct cppi5_host_desc_t *h_desc = d->hwdesc[0].cppi5_desc_vaddr;
+
+	memcpy(d->metadata, h_desc->epib, d->metadata_size);
+}
+
+static bool udma_is_desc_really_done(struct udma_chan *uc, struct udma_desc *d)
+{
+	u32 peer_bcnt, bcnt;
+
+	/* Only TX towards PDMA is affected */
+	if (uc->ep_type == PSIL_EP_NATIVE || uc->dir != DMA_MEM_TO_DEV)
+		return true;
+
+	peer_bcnt = udma_tchanrt_read(uc->tchan, UDMA_TCHAN_RT_PEER_BCNT_REG);
+	bcnt = udma_tchanrt_read(uc->tchan, UDMA_TCHAN_RT_BCNT_REG);
+
+	if (peer_bcnt < bcnt)
+		return false;
+
+	return true;
+}
+
+static void udma_flush_tx(struct udma_chan *uc)
+{
+	if (uc->dir != DMA_MEM_TO_DEV)
+		return;
+
+	uc->state = UDMA_CHAN_IS_ACTIVE_FLUSH;
+
+	udma_tchanrt_write(uc->tchan, UDMA_TCHAN_RT_CTL_REG,
+			   UDMA_CHAN_RT_CTL_EN |
+			   UDMA_CHAN_RT_CTL_TDOWN);
+}
+
+static irqreturn_t udma_ring_irq_handler(int irq, void *data)
+{
+	struct udma_chan *uc = data;
+	struct udma_desc *d;
+	unsigned long flags;
+	dma_addr_t paddr = 0;
+
+	if (udma_pop_from_ring(uc, &paddr) || !paddr)
+		return IRQ_HANDLED;
+
+	spin_lock_irqsave(&uc->vc.lock, flags);
+
+	/* Teardown completion message */
+	if (cppi5_desc_is_tdcm(paddr)) {
+		/* Compensate our internal pop/push counter */
+		uc->in_ring_cnt++;
+
+		complete_all(&uc->teardown_completed);
+
+		if (uc->terminated_desc) {
+			udma_desc_free(&uc->terminated_desc->vd);
+			uc->terminated_desc = NULL;
+		}
+
+		if (!uc->desc)
+			udma_start(uc);
+
+		if (uc->state != UDMA_CHAN_IS_ACTIVE_FLUSH)
+			goto out;
+		else if (uc->desc)
+			paddr = udma_curr_cppi5_desc_paddr(uc->desc,
+							   uc->desc->desc_idx);
+	}
+
+	d = udma_udma_desc_from_paddr(uc, paddr);
+
+	if (d) {
+		dma_addr_t desc_paddr = udma_curr_cppi5_desc_paddr(d,
+								   d->desc_idx);
+		if (desc_paddr != paddr) {
+			dev_err(uc->ud->dev, "not matching descriptors!\n");
+			goto out;
+		}
+
+		if (uc->cyclic) {
+			/* push the descriptor back to the ring */
+			if (d == uc->desc) {
+				udma_cyclic_packet_elapsed(uc);
+				vchan_cyclic_callback(&d->vd);
+			}
+		} else {
+			bool desc_done = true;
+
+			if (d == uc->desc) {
+				desc_done = udma_is_desc_really_done(uc, d);
+
+				if (desc_done) {
+					uc->bcnt += d->residue;
+					udma_start(uc);
+				} else {
+					udma_flush_tx(uc);
+				}
+			} else if (d == uc->terminated_desc) {
+				uc->terminated_desc = NULL;
+			}
+
+			if (desc_done)
+				vchan_cookie_complete(&d->vd);
+		}
+	}
+out:
+	spin_unlock_irqrestore(&uc->vc.lock, flags);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t udma_udma_irq_handler(int irq, void *data)
+{
+	struct udma_chan *uc = data;
+	struct udma_desc *d;
+	unsigned long flags;
+
+	spin_lock_irqsave(&uc->vc.lock, flags);
+	d = uc->desc;
+	if (d) {
+		d->tr_idx = (d->tr_idx + 1) % d->sglen;
+
+		if (uc->cyclic) {
+			vchan_cyclic_callback(&d->vd);
+		} else {
+			/* TODO: figure out the real amount of data */
+			uc->bcnt += d->residue;
+			udma_start(uc);
+			vchan_cookie_complete(&d->vd);
+		}
+	}
+
+	spin_unlock_irqrestore(&uc->vc.lock, flags);
+
+	return IRQ_HANDLED;
+}
diff --git a/drivers/dma/ti/k3-udma.h b/drivers/dma/ti/k3-udma.h
new file mode 100644
index 000000000000..ff428f823e67
--- /dev/null
+++ b/drivers/dma/ti/k3-udma.h
@@ -0,0 +1,120 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
+ */
+
+#ifndef K3_UDMA_H_
+#define K3_UDMA_H_
+
+#include <linux/soc/ti/ti_sci_protocol.h>
+
+/* Global registers */
+#define UDMA_REV_REG			0x0
+#define UDMA_PERF_CTL_REG		0x4
+#define UDMA_EMU_CTL_REG		0x8
+#define UDMA_PSIL_TO_REG		0x10
+#define UDMA_UTC_CTL_REG		0x1c
+#define UDMA_CAP_REG(i)			(0x20 + ((i) * 4))
+#define UDMA_RX_FLOW_ID_FW_OES_REG	0x80
+#define UDMA_RX_FLOW_ID_FW_STATUS_REG	0x88
+
+/* TX chan RT regs */
+#define UDMA_TCHAN_RT_CTL_REG		0x0
+#define UDMA_TCHAN_RT_SWTRIG_REG	0x8
+#define UDMA_TCHAN_RT_STDATA_REG	0x80
+
+#define UDMA_TCHAN_RT_PEER_REG(i)	(0x200 + ((i) * 0x4))
+#define UDMA_TCHAN_RT_PEER_STATIC_TR_XY_REG	\
+	UDMA_TCHAN_RT_PEER_REG(0)	/* PSI-L: 0x400 */
+#define UDMA_TCHAN_RT_PEER_STATIC_TR_Z_REG	\
+	UDMA_TCHAN_RT_PEER_REG(1)	/* PSI-L: 0x401 */
+#define UDMA_TCHAN_RT_PEER_BCNT_REG		\
+	UDMA_TCHAN_RT_PEER_REG(4)	/* PSI-L: 0x404 */
+#define UDMA_TCHAN_RT_PEER_RT_EN_REG		\
+	UDMA_TCHAN_RT_PEER_REG(8)	/* PSI-L: 0x408 */
+
+#define UDMA_TCHAN_RT_PCNT_REG		0x400
+#define UDMA_TCHAN_RT_BCNT_REG		0x408
+#define UDMA_TCHAN_RT_SBCNT_REG		0x410
+
+/* RX chan RT regs */
+#define UDMA_RCHAN_RT_CTL_REG		0x0
+#define UDMA_RCHAN_RT_SWTRIG_REG	0x8
+#define UDMA_RCHAN_RT_STDATA_REG	0x80
+
+#define UDMA_RCHAN_RT_PEER_REG(i)	(0x200 + ((i) * 0x4))
+#define UDMA_RCHAN_RT_PEER_STATIC_TR_XY_REG	\
+	UDMA_RCHAN_RT_PEER_REG(0)	/* PSI-L: 0x400 */
+#define UDMA_RCHAN_RT_PEER_STATIC_TR_Z_REG	\
+	UDMA_RCHAN_RT_PEER_REG(1)	/* PSI-L: 0x401 */
+#define UDMA_RCHAN_RT_PEER_BCNT_REG		\
+	UDMA_RCHAN_RT_PEER_REG(4)	/* PSI-L: 0x404 */
+#define UDMA_RCHAN_RT_PEER_RT_EN_REG		\
+	UDMA_RCHAN_RT_PEER_REG(8)	/* PSI-L: 0x408 */
+
+#define UDMA_RCHAN_RT_PCNT_REG		0x400
+#define UDMA_RCHAN_RT_BCNT_REG		0x408
+#define UDMA_RCHAN_RT_SBCNT_REG		0x410
+
+/* UDMA_TCHAN_RT_CTL_REG/UDMA_RCHAN_RT_CTL_REG */
+#define UDMA_CHAN_RT_CTL_EN		BIT(31)
+#define UDMA_CHAN_RT_CTL_TDOWN		BIT(30)
+#define UDMA_CHAN_RT_CTL_PAUSE		BIT(29)
+#define UDMA_CHAN_RT_CTL_FTDOWN		BIT(28)
+#define UDMA_CHAN_RT_CTL_ERROR		BIT(0)
+
+/* UDMA_TCHAN_RT_PEER_RT_EN_REG/UDMA_RCHAN_RT_PEER_RT_EN_REG (PSI-L: 0x408) */
+#define UDMA_PEER_RT_EN_ENABLE		BIT(31)
+#define UDMA_PEER_RT_EN_TEARDOWN	BIT(30)
+#define UDMA_PEER_RT_EN_PAUSE		BIT(29)
+#define UDMA_PEER_RT_EN_FLUSH		BIT(28)
+#define UDMA_PEER_RT_EN_IDLE		BIT(1)
+
+/*
+ * UDMA_TCHAN_RT_PEER_STATIC_TR_XY_REG /
+ * UDMA_RCHAN_RT_PEER_STATIC_TR_XY_REG
+ */
+#define PDMA_STATIC_TR_X_MASK		GENMASK(26, 24)
+#define PDMA_STATIC_TR_X_SHIFT		(24)
+#define PDMA_STATIC_TR_Y_MASK		GENMASK(11, 0)
+#define PDMA_STATIC_TR_Y_SHIFT		(0)
+
+#define PDMA_STATIC_TR_Y(x)	\
+	(((x) << PDMA_STATIC_TR_Y_SHIFT) & PDMA_STATIC_TR_Y_MASK)
+#define PDMA_STATIC_TR_X(x)	\
+	(((x) << PDMA_STATIC_TR_X_SHIFT) & PDMA_STATIC_TR_X_MASK)
+
+#define PDMA_STATIC_TR_XY_ACC32		BIT(30)
+#define PDMA_STATIC_TR_XY_BURST		BIT(31)
+
+/*
+ * UDMA_TCHAN_RT_PEER_STATIC_TR_Z_REG /
+ * UDMA_RCHAN_RT_PEER_STATIC_TR_Z_REG
+ */
+#define PDMA_STATIC_TR_Z(x, mask)	((x) & (mask))
+
+struct udma_dev;
+struct udma_tchan;
+struct udma_rchan;
+struct udma_rflow;
+
+enum udma_rm_range {
+	RM_RANGE_TCHAN = 0,
+	RM_RANGE_RCHAN,
+	RM_RANGE_RFLOW,
+	RM_RANGE_LAST,
+};
+
+struct udma_tisci_rm {
+	const struct ti_sci_handle *tisci;
+	const struct ti_sci_rm_udmap_ops *tisci_udmap_ops;
+	u32  tisci_dev_id;
+
+	/* tisci information for PSI-L thread pairing/unpairing */
+	const struct ti_sci_rm_psil_ops *tisci_psil_ops;
+	u32  tisci_navss_dev_id;
+
+	struct ti_sci_resource *rm_ranges[RM_RANGE_LAST];
+};
+
+#endif /* K3_UDMA_H_ */
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki