1 files changed, 0 insertions, 411 deletions
diff --git a/drivers/dma/ptdma/ptdma-dmaengine.c b/drivers/dma/ptdma/ptdma-dmaengine.c
deleted file mode 100644
index f79240734807..000000000000
--- a/drivers/dma/ptdma/ptdma-dmaengine.c
+++ /dev/null
@@ -1,411 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * AMD Passthrough DMA device driver
- * -- Based on the CCP driver
- *
- * Copyright (C) 2016,2021 Advanced Micro Devices, Inc.
- *
- * Author: Sanjay R Mehta <sanju.mehta@amd.com>
- * Author: Gary R Hook <gary.hook@amd.com>
- */
-
-#include "ptdma.h"
-#include "../dmaengine.h"
-#include "../virt-dma.h"
-
-static inline struct pt_dma_chan *to_pt_chan(struct dma_chan *dma_chan)
-{
-	return container_of(dma_chan, struct pt_dma_chan, vc.chan);
-}
-
-static inline struct pt_dma_desc *to_pt_desc(struct virt_dma_desc *vd)
-{
-	return container_of(vd, struct pt_dma_desc, vd);
-}
-
-static void pt_free_chan_resources(struct dma_chan *dma_chan)
-{
-	struct pt_dma_chan *chan = to_pt_chan(dma_chan);
-
-	vchan_free_chan_resources(&chan->vc);
-}
-
-static void pt_synchronize(struct dma_chan *dma_chan)
-{
-	struct pt_dma_chan *chan = to_pt_chan(dma_chan);
-
-	vchan_synchronize(&chan->vc);
-}
-
-static void pt_do_cleanup(struct virt_dma_desc *vd)
-{
-	struct pt_dma_desc *desc = to_pt_desc(vd);
-	struct pt_device *pt = desc->pt;
-
-	kmem_cache_free(pt->dma_desc_cache, desc);
-}
-
-static int pt_dma_start_desc(struct pt_dma_desc *desc)
-{
-	struct pt_passthru_engine *pt_engine;
-	struct pt_device *pt;
-	struct pt_cmd *pt_cmd;
-	struct pt_cmd_queue *cmd_q;
-
-	desc->issued_to_hw = 1;
-
-	pt_cmd = &desc->pt_cmd;
-	pt = pt_cmd->pt;
-	cmd_q = &pt->cmd_q;
-	pt_engine = &pt_cmd->passthru;
-
-	pt->tdata.cmd = pt_cmd;
-
-	/* Execute the command */
-	pt_cmd->ret = pt_core_perform_passthru(cmd_q, pt_engine);
-
-	return 0;
-}
-
-static struct pt_dma_desc *pt_next_dma_desc(struct pt_dma_chan *chan)
-{
-	/* Get the next DMA descriptor on the active list */
-	struct virt_dma_desc *vd = vchan_next_desc(&chan->vc);
-
-	return vd ? to_pt_desc(vd) : NULL;
-}
-
-static struct pt_dma_desc *pt_handle_active_desc(struct pt_dma_chan *chan,
-						 struct pt_dma_desc *desc)
-{
-	struct dma_async_tx_descriptor *tx_desc;
-	struct virt_dma_desc *vd;
-	unsigned long flags;
-
-	/* Loop over descriptors until one is found with commands */
-	do {
-		if (desc) {
-			if (!desc->issued_to_hw) {
-				/* No errors, keep going */
-				if (desc->status != DMA_ERROR)
-					return desc;
-			}
-
-			tx_desc = &desc->vd.tx;
-			vd = &desc->vd;
-		} else {
-			tx_desc = NULL;
-		}
-
-		spin_lock_irqsave(&chan->vc.lock, flags);
-
-		if (desc) {
-			if (desc->status != DMA_COMPLETE) {
-				if (desc->status != DMA_ERROR)
-					desc->status = DMA_COMPLETE;
-
-				dma_cookie_complete(tx_desc);
-				dma_descriptor_unmap(tx_desc);
-				list_del(&desc->vd.node);
-			} else {
-				/* Don't handle it twice */
-				tx_desc = NULL;
-			}
-		}
-
-		desc = pt_next_dma_desc(chan);
-
-		spin_unlock_irqrestore(&chan->vc.lock, flags);
-
-		if (tx_desc) {
-			dmaengine_desc_get_callback_invoke(tx_desc, NULL);
-			dma_run_dependencies(tx_desc);
-			vchan_vdesc_fini(vd);
-		}
-	} while (desc);
-
-	return NULL;
-}
-
-static void pt_cmd_callback(void *data, int err)
-{
-	struct pt_dma_desc *desc = data;
-	struct dma_chan *dma_chan;
-	struct pt_dma_chan *chan;
-	int ret;
-
-	if (err == -EINPROGRESS)
-		return;
-
-	dma_chan = desc->vd.tx.chan;
-	chan = to_pt_chan(dma_chan);
-
-	if (err)
-		desc->status = DMA_ERROR;
-
-	while (true) {
-		/* Check for DMA descriptor completion */
-		desc = pt_handle_active_desc(chan, desc);
-
-		/* Don't submit cmd if no descriptor or DMA is paused */
-		if (!desc)
-			break;
-
-		ret = pt_dma_start_desc(desc);
-		if (!ret)
-			break;
-
-		desc->status = DMA_ERROR;
-	}
-}
-
-static struct pt_dma_desc *pt_alloc_dma_desc(struct pt_dma_chan *chan,
-					     unsigned long flags)
-{
-	struct pt_dma_desc *desc;
-
-	desc = kmem_cache_zalloc(chan->pt->dma_desc_cache, GFP_NOWAIT);
-	if (!desc)
-		return NULL;
-
-	vchan_tx_prep(&chan->vc, &desc->vd, flags);
-
-	desc->pt = chan->pt;
-	desc->pt->cmd_q.int_en = !!(flags & DMA_PREP_INTERRUPT);
-	desc->issued_to_hw = 0;
-	desc->status = DMA_IN_PROGRESS;
-
-	return desc;
-}
-
-static struct pt_dma_desc *pt_create_desc(struct dma_chan *dma_chan,
-					  dma_addr_t dst,
-					  dma_addr_t src,
-					  unsigned int len,
-					  unsigned long flags)
-{
-	struct pt_dma_chan *chan = to_pt_chan(dma_chan);
-	struct pt_passthru_engine *pt_engine;
-	struct pt_dma_desc *desc;
-	struct pt_cmd *pt_cmd;
-
-	desc = pt_alloc_dma_desc(chan, flags);
-	if (!desc)
-		return NULL;
-
-	pt_cmd = &desc->pt_cmd;
-	pt_cmd->pt = chan->pt;
-	pt_engine = &pt_cmd->passthru;
-	pt_cmd->engine = PT_ENGINE_PASSTHRU;
-	pt_engine->src_dma = src;
-	pt_engine->dst_dma = dst;
-	pt_engine->src_len = len;
-	pt_cmd->pt_cmd_callback = pt_cmd_callback;
-	pt_cmd->data = desc;
-
-	desc->len = len;
-
-	return desc;
-}
-
-static struct dma_async_tx_descriptor *
-pt_prep_dma_memcpy(struct dma_chan *dma_chan, dma_addr_t dst,
-		   dma_addr_t src, size_t len, unsigned long flags)
-{
-	struct pt_dma_desc *desc;
-
-	desc = pt_create_desc(dma_chan, dst, src, len, flags);
-	if (!desc)
-		return NULL;
-
-	return &desc->vd.tx;
-}
-
-static struct dma_async_tx_descriptor *
-pt_prep_dma_interrupt(struct dma_chan *dma_chan, unsigned long flags)
-{
-	struct pt_dma_chan *chan = to_pt_chan(dma_chan);
-	struct pt_dma_desc *desc;
-
-	desc = pt_alloc_dma_desc(chan, flags);
-	if (!desc)
-		return NULL;
-
-	return &desc->vd.tx;
-}
-
-static void pt_issue_pending(struct dma_chan *dma_chan)
-{
-	struct pt_dma_chan *chan = to_pt_chan(dma_chan);
-	struct pt_dma_desc *desc;
-	unsigned long flags;
-	bool engine_is_idle = true;
-
-	spin_lock_irqsave(&chan->vc.lock, flags);
-
-	desc = pt_next_dma_desc(chan);
-	if (desc)
-		engine_is_idle = false;
-
-	vchan_issue_pending(&chan->vc);
-
-	desc = pt_next_dma_desc(chan);
-
-	spin_unlock_irqrestore(&chan->vc.lock, flags);
-
-	/* If there was nothing active, start processing */
-	if (engine_is_idle && desc)
-		pt_cmd_callback(desc, 0);
-}
-
-static enum dma_status
-pt_tx_status(struct dma_chan *c, dma_cookie_t cookie,
-		struct dma_tx_state *txstate)
-{
-	struct pt_device *pt = to_pt_chan(c)->pt;
-	struct pt_cmd_queue *cmd_q = &pt->cmd_q;
-
-	pt_check_status_trans(pt, cmd_q);
-	return dma_cookie_status(c, cookie, txstate);
-}
-
-static int pt_pause(struct dma_chan *dma_chan)
-{
-	struct pt_dma_chan *chan = to_pt_chan(dma_chan);
-	unsigned long flags;
-
-	spin_lock_irqsave(&chan->vc.lock, flags);
-	pt_stop_queue(&chan->pt->cmd_q);
-	spin_unlock_irqrestore(&chan->vc.lock, flags);
-
-	return 0;
-}
-
-static int pt_resume(struct dma_chan *dma_chan)
-{
-	struct pt_dma_chan *chan = to_pt_chan(dma_chan);
-	struct pt_dma_desc *desc = NULL;
-	unsigned long flags;
-
-	spin_lock_irqsave(&chan->vc.lock, flags);
-	pt_start_queue(&chan->pt->cmd_q);
-	desc = pt_next_dma_desc(chan);
-	spin_unlock_irqrestore(&chan->vc.lock, flags);
-
-	/* If there was something active, re-start */
-	if (desc)
-		pt_cmd_callback(desc, 0);
-
-	return 0;
-}
-
-static int pt_terminate_all(struct dma_chan *dma_chan)
-{
-	struct pt_dma_chan *chan = to_pt_chan(dma_chan);
-	unsigned long flags;
-	struct pt_cmd_queue *cmd_q = &chan->pt->cmd_q;
-	LIST_HEAD(head);
-
-	iowrite32(SUPPORTED_INTERRUPTS, cmd_q->reg_control + 0x0010);
-	spin_lock_irqsave(&chan->vc.lock, flags);
-	vchan_get_all_descriptors(&chan->vc, &head);
-	spin_unlock_irqrestore(&chan->vc.lock, flags);
-
-	vchan_dma_desc_free_list(&chan->vc, &head);
-	vchan_free_chan_resources(&chan->vc);
-
-	return 0;
-}
-
-int pt_dmaengine_register(struct pt_device *pt)
-{
-	struct pt_dma_chan *chan;
-	struct dma_device *dma_dev = &pt->dma_dev;
-	char *cmd_cache_name;
-	char *desc_cache_name;
-	int ret;
-
-	pt->pt_dma_chan = devm_kzalloc(pt->dev, sizeof(*pt->pt_dma_chan),
-				       GFP_KERNEL);
-	if (!pt->pt_dma_chan)
-		return -ENOMEM;
-
-	cmd_cache_name = devm_kasprintf(pt->dev, GFP_KERNEL,
-					"%s-dmaengine-cmd-cache",
-					dev_name(pt->dev));
-	if (!cmd_cache_name)
-		return -ENOMEM;
-
-	desc_cache_name = devm_kasprintf(pt->dev, GFP_KERNEL,
-					 "%s-dmaengine-desc-cache",
-					 dev_name(pt->dev));
-	if (!desc_cache_name) {
-		ret = -ENOMEM;
-		goto err_cache;
-	}
-
-	pt->dma_desc_cache = kmem_cache_create(desc_cache_name,
-					       sizeof(struct pt_dma_desc), 0,
-					       SLAB_HWCACHE_ALIGN, NULL);
-	if (!pt->dma_desc_cache) {
-		ret = -ENOMEM;
-		goto err_cache;
-	}
-
-	dma_dev->dev = pt->dev;
-	dma_dev->src_addr_widths = DMA_SLAVE_BUSWIDTH_64_BYTES;
-	dma_dev->dst_addr_widths = DMA_SLAVE_BUSWIDTH_64_BYTES;
-	dma_dev->directions = DMA_MEM_TO_MEM;
-	dma_dev->residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
-	dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
-	dma_cap_set(DMA_INTERRUPT, dma_dev->cap_mask);
-
-	/*
-	 * PTDMA is intended to be used with the AMD NTB devices, hence
-	 * marking it as DMA_PRIVATE.
-	 */
-	dma_cap_set(DMA_PRIVATE, dma_dev->cap_mask);
-
-	INIT_LIST_HEAD(&dma_dev->channels);
-
-	chan = pt->pt_dma_chan;
-	chan->pt = pt;
-
-	/* Set base and prep routines */
-	dma_dev->device_free_chan_resources = pt_free_chan_resources;
-	dma_dev->device_prep_dma_memcpy = pt_prep_dma_memcpy;
-	dma_dev->device_prep_dma_interrupt = pt_prep_dma_interrupt;
-	dma_dev->device_issue_pending = pt_issue_pending;
-	dma_dev->device_tx_status = pt_tx_status;
-	dma_dev->device_pause = pt_pause;
-	dma_dev->device_resume = pt_resume;
-	dma_dev->device_terminate_all = pt_terminate_all;
-	dma_dev->device_synchronize = pt_synchronize;
-
-	chan->vc.desc_free = pt_do_cleanup;
-	vchan_init(&chan->vc, dma_dev);
-
-	ret = dma_async_device_register(dma_dev);
-	if (ret)
-		goto err_reg;
-
-	return 0;
-
-err_reg:
-	kmem_cache_destroy(pt->dma_desc_cache);
-
-err_cache:
-	kmem_cache_destroy(pt->dma_cmd_cache);
-
-	return ret;
-}
-
-void pt_dmaengine_unregister(struct pt_device *pt)
-{
-	struct dma_device *dma_dev = &pt->dma_dev;
-
-	dma_async_device_unregister(dma_dev);
-
-	kmem_cache_destroy(pt->dma_desc_cache);
-	kmem_cache_destroy(pt->dma_cmd_cache);
-}