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From: Andrea della Porta <andrea.porta@suse.com>
To: Vinod Koul <vkoul@kernel.org>,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Florian Fainelli <florian.fainelli@broadcom.com>,
	Ray Jui <rjui@broadcom.com>,
	Scott Branden <sbranden@broadcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@broadcom.com>,
	Saenz Julienne <nsaenz@kernel.org>,
	dmaengine@vger.kernel.org,
	devicetree@vger.kernel.org,
	linux-rpi-kernel@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	dave.stevenson@raspberrypi.com
Cc: Phil Elwell <phil@raspberrypi.org>,
	Maxime Ripard <maxime@cerno.tech>,
	Stefan Wahren <stefan.wahren@i2se.com>,
	Dom Cobley <popcornmix@gmail.com>,
	Andrea della Porta <andrea.porta@suse.com>
Subject: [PATCH v2 11/15] dmaengine: bcm2835: pass dma_chan to generic functions
Date: Wed, 13 Mar 2024 15:08:36 +0100
Message-ID: <2dedf0428cbc5229ea563a571d297a64c8e09c03.1710226514.git.andrea.porta@suse.com>
In-Reply-To: <cover.1710226514.git.andrea.porta@suse.com>
References: <cover.1710226514.git.andrea.porta@suse.com>
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In preparation to support more platforms pass the dma_chan to the
generic functions. This provides access to the DMA device and possible
platform specific data.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Andrea della Porta <andrea.porta@suse.com>
---
 drivers/dma/bcm2835-dma.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c
index 03d97312a3f8..88ae5d05402e 100644
--- a/drivers/dma/bcm2835-dma.c
+++ b/drivers/dma/bcm2835-dma.c
@@ -308,13 +308,14 @@ static void bcm2835_dma_desc_free(struct virt_dma_desc *vd)
 	bcm2835_dma_free_cb_chain(container_of(vd, struct bcm2835_desc, vd));
 }
 
-static bool bcm2835_dma_create_cb_set_length(struct bcm2835_chan *chan,
+static bool bcm2835_dma_create_cb_set_length(struct dma_chan *chan,
 					     struct bcm2835_dma_cb *control_block,
 					     size_t len,
 					     size_t period_len,
 					     size_t *total_len)
 {
-	size_t max_len = bcm2835_dma_max_frame_length(chan);
+	struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
+	size_t max_len = bcm2835_dma_max_frame_length(c);
 
 	/* set the length taking lite-channel limitations into account */
 	control_block->length = min_t(u32, len, max_len);
@@ -441,7 +442,7 @@ static struct bcm2835_desc *bcm2835_dma_create_cb_chain(
 		if (buf_len) {
 			/* calculate length honoring period_length */
 			if (bcm2835_dma_create_cb_set_length(
-				c, control_block,
+				chan, control_block,
 				len, period_len, &total_len)) {
 				/* add extrainfo bits in info */
 				control_block->info |= extrainfo;
@@ -508,8 +509,9 @@ static void bcm2835_dma_fill_cb_chain_with_sg(
 	}
 }
 
-static void bcm2835_dma_abort(struct bcm2835_chan *c)
+static void bcm2835_dma_abort(struct dma_chan *chan)
 {
+	struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
 	void __iomem *chan_base = c->chan_base;
 	long timeout = 100;
 
@@ -550,8 +552,9 @@ static void bcm2835_dma_abort(struct bcm2835_chan *c)
 	writel(BCM2835_DMA_RESET, chan_base + BCM2835_DMA_CS);
 }
 
-static void bcm2835_dma_start_desc(struct bcm2835_chan *c)
+static void bcm2835_dma_start_desc(struct dma_chan *chan)
 {
+	struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
 	struct virt_dma_desc *vd = vchan_next_desc(&c->vc);
 
 	if (!vd) {
@@ -570,7 +573,8 @@ static void bcm2835_dma_start_desc(struct bcm2835_chan *c)
 
 static irqreturn_t bcm2835_dma_callback(int irq, void *data)
 {
-	struct bcm2835_chan *c = data;
+	struct dma_chan *chan = data;
+	struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
 	struct bcm2835_desc *d;
 	unsigned long flags;
 
@@ -604,7 +608,7 @@ static irqreturn_t bcm2835_dma_callback(int irq, void *data)
 			vchan_cyclic_callback(&d->vd);
 		} else if (!readl(c->chan_base + BCM2835_DMA_ADDR)) {
 			vchan_cookie_complete(&c->desc->vd);
-			bcm2835_dma_start_desc(c);
+			bcm2835_dma_start_desc(chan);
 		}
 	}
 
@@ -632,7 +636,7 @@ static int bcm2835_dma_alloc_chan_resources(struct dma_chan *chan)
 	}
 
 	return request_irq(c->irq_number, bcm2835_dma_callback,
-			   c->irq_flags, "DMA IRQ", c);
+			   c->irq_flags, "DMA IRQ", chan);
 }
 
 static void bcm2835_dma_free_chan_resources(struct dma_chan *chan)
@@ -721,7 +725,7 @@ static void bcm2835_dma_issue_pending(struct dma_chan *chan)
 
 	spin_lock_irqsave(&c->vc.lock, flags);
 	if (vchan_issue_pending(&c->vc) && !c->desc)
-		bcm2835_dma_start_desc(c);
+		bcm2835_dma_start_desc(chan);
 
 	spin_unlock_irqrestore(&c->vc.lock, flags);
 }
@@ -885,7 +889,7 @@ static int bcm2835_dma_terminate_all(struct dma_chan *chan)
 	if (c->desc) {
 		vchan_terminate_vdesc(&c->desc->vd);
 		c->desc = NULL;
-		bcm2835_dma_abort(c);
+		bcm2835_dma_abort(chan);
 	}
 
 	vchan_get_all_descriptors(&c->vc, &head);
-- 
2.35.3