usb: musb: tusb6010_omap: Create new struct for DMA data/parameters

For the DMA we have ch (channel), dmareq and sync_dev parameters both
within the tusb_omap_dma_ch and tusb_omap_dma struct.
By creating a common struct the code can be simplified when selecting
between the shared or multichannel DMA parameters.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/musb/tusb6010_omap.c

@@ -31,6 +31,12 @@
 #define OMAP242X_DMA_EXT_DMAREQ4	16
 #define OMAP242X_DMA_EXT_DMAREQ5	64
 
+struct tusb_dma_data {
+	int			ch;
+	s8			dmareq;
+	s8			sync_dev;
+};
+
 struct tusb_omap_dma_ch {
 	struct musb		*musb;
 	void __iomem		*tbase;
@@ -39,9 +45,7 @@ struct tusb_omap_dma_ch {
 	u8			tx;
 	struct musb_hw_ep	*hw_ep;
 
-	int			ch;
-	s8			dmareq;
-	s8			sync_dev;
+	struct tusb_dma_data	dma_data;
 
 	struct tusb_omap_dma	*tusb_dma;
 
@@ -58,9 +62,7 @@ struct tusb_omap_dma {
 	struct dma_controller		controller;
 	void __iomem			*tbase;
 
-	int				ch;
-	s8				dmareq;
-	s8				sync_dev;
+	struct tusb_dma_data		dma_data;
 	unsigned			multichannel:1;
 };
 
@@ -119,9 +121,9 @@ static void tusb_omap_dma_cb(int lch, u16 ch_status, void *data)
 	spin_lock_irqsave(&musb->lock, flags);
 
 	if (tusb_dma->multichannel)
-		ch = chdat->ch;
+		ch = chdat->dma_data.ch;
 	else
-		ch = tusb_dma->ch;
+		ch = tusb_dma->dma_data.ch;
 
 	if (ch_status != OMAP_DMA_BLOCK_IRQ)
 		printk(KERN_ERR "TUSB DMA error status: %i\n", ch_status);
@@ -140,8 +142,7 @@ static void tusb_omap_dma_cb(int lch, u16 ch_status, void *data)
 	/* HW issue #10: XFR_SIZE may get corrupt on DMA (both async & sync) */
 	if (unlikely(remaining > chdat->transfer_len)) {
 		dev_dbg(musb->controller, "Corrupt %s dma ch%i XFR_SIZE: 0x%08lx\n",
-			chdat->tx ? "tx" : "rx", chdat->ch,
-			remaining);
+			chdat->tx ? "tx" : "rx", ch, remaining);
 		remaining = 0;
 	}
 
@@ -220,9 +221,7 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
 	int				src_burst, dst_burst;
 	u16				csr;
 	u32				psize;
-	int				ch;
-	s8				dmareq;
-	s8				sync_dev;
+	struct tusb_dma_data		*dma_data;
 
 	if (unlikely(dma_addr & 0x1) || (len < 32) || (len > packet_sz))
 		return false;
@@ -249,7 +248,7 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
 	dma_remaining = TUSB_EP_CONFIG_XFR_SIZE(dma_remaining);
 	if (dma_remaining) {
 		dev_dbg(musb->controller, "Busy %s dma ch%i, not using: %08x\n",
-			chdat->tx ? "tx" : "rx", chdat->ch,
+			chdat->tx ? "tx" : "rx", chdat->dma_data.ch,
 			dma_remaining);
 		return false;
 	}
@@ -262,15 +261,15 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
 		chdat->transfer_packet_sz = packet_sz;
 
 	if (tusb_dma->multichannel) {
-		ch = chdat->ch;
-		dmareq = chdat->dmareq;
-		sync_dev = chdat->sync_dev;
+		dma_data = &chdat->dma_data;
 	} else {
+		dma_data = &tusb_dma->dma_data;
+
 		if (tusb_omap_use_shared_dmareq(chdat) != 0) {
 			dev_dbg(musb->controller, "could not get dma for ep%i\n", chdat->epnum);
 			return false;
 		}
-		if (tusb_dma->ch < 0) {
+		if (dma_data->ch < 0) {
 			/* REVISIT: This should get blocked earlier, happens
 			 * with MSC ErrorRecoveryTest
 			 */
@@ -278,10 +277,7 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
 			return false;
 		}
 
-		ch = tusb_dma->ch;
-		dmareq = tusb_dma->dmareq;
-		sync_dev = tusb_dma->sync_dev;
-		omap_set_dma_callback(ch, tusb_omap_dma_cb, channel);
+		omap_set_dma_callback(dma_data->ch, tusb_omap_dma_cb, channel);
 	}
 
 	chdat->packet_sz = packet_sz;
@@ -312,7 +308,7 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
 
 	dev_dbg(musb->controller, "ep%i %s dma ch%i dma: %pad len: %u(%u) packet_sz: %i(%i)\n",
 		chdat->epnum, chdat->tx ? "tx" : "rx",
-		ch, &dma_addr, chdat->transfer_len, len,
+		dma_data->ch, &dma_addr, chdat->transfer_len, len,
 		chdat->transfer_packet_sz, packet_sz);
 
 	/*
@@ -329,7 +325,7 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
 		dma_params.dst_ei	= 1;
 		dma_params.dst_fi	= -31;	/* Loop 32 byte window */
 
-		dma_params.trigger	= sync_dev;
+		dma_params.trigger	= dma_data->sync_dev;
 		dma_params.sync_mode	= OMAP_DMA_SYNC_FRAME;
 		dma_params.src_or_dst_synch	= 0;	/* Dest sync */
 
@@ -346,7 +342,7 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
 		dma_params.dst_ei	= 0;
 		dma_params.dst_fi	= 0;
 
-		dma_params.trigger	= sync_dev;
+		dma_params.trigger	= dma_data->sync_dev;
 		dma_params.sync_mode	= OMAP_DMA_SYNC_FRAME;
 		dma_params.src_or_dst_synch	= 1;	/* Source sync */
 
@@ -360,10 +356,10 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
 		((dma_addr & 0x3) == 0) ? "sync" : "async",
 		dma_params.src_start, dma_params.dst_start);
 
-	omap_set_dma_params(ch, &dma_params);
-	omap_set_dma_src_burst_mode(ch, src_burst);
-	omap_set_dma_dest_burst_mode(ch, dst_burst);
-	omap_set_dma_write_mode(ch, OMAP_DMA_WRITE_LAST_NON_POSTED);
+	omap_set_dma_params(dma_data->ch, &dma_params);
+	omap_set_dma_src_burst_mode(dma_data->ch, src_burst);
+	omap_set_dma_dest_burst_mode(dma_data->ch, dst_burst);
+	omap_set_dma_write_mode(dma_data->ch, OMAP_DMA_WRITE_LAST_NON_POSTED);
 
 	/*
 	 * Prepare MUSB for DMA transfer
@@ -386,7 +382,7 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
 	/*
 	 * Start DMA transfer
 	 */
-	omap_start_dma(ch);
+	omap_start_dma(dma_data->ch);
 
 	if (chdat->tx) {
 		/* Send transfer_packet_sz packets at a time */
@@ -415,16 +411,17 @@ static int tusb_omap_dma_abort(struct dma_channel *channel)
 {
 	struct tusb_omap_dma_ch	*chdat = to_chdat(channel);
 	struct tusb_omap_dma	*tusb_dma = chdat->tusb_dma;
+	struct tusb_dma_data	*dma_data = &tusb_dma->dma_data;
 
 	if (!tusb_dma->multichannel) {
-		if (tusb_dma->ch >= 0) {
-			omap_stop_dma(tusb_dma->ch);
-			omap_free_dma(tusb_dma->ch);
-			tusb_dma->ch = -1;
+		if (dma_data->ch >= 0) {
+			omap_stop_dma(dma_data->ch);
+			omap_free_dma(dma_data->ch);
+			dma_data->ch = -1;
 		}
 
-		tusb_dma->dmareq = -1;
-		tusb_dma->sync_dev = -1;
+		dma_data->dmareq = -1;
+		dma_data->sync_dev = -1;
 	}
 
 	channel->status = MUSB_DMA_STATUS_FREE;
@@ -462,8 +459,8 @@ static inline int tusb_omap_dma_allocate_dmareq(struct tusb_omap_dma_ch *chdat)
 		reg |= ((1 << 4) << (dmareq_nr * 5));
 	musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg);
 
-	chdat->dmareq = dmareq_nr;
-	chdat->sync_dev = sync_dev[chdat->dmareq];
+	chdat->dma_data.dmareq = dmareq_nr;
+	chdat->dma_data.sync_dev = sync_dev[chdat->dma_data.dmareq];
 
 	return 0;
 }
@@ -472,15 +469,15 @@ static inline void tusb_omap_dma_free_dmareq(struct tusb_omap_dma_ch *chdat)
 {
 	u32 reg;
 
-	if (!chdat || chdat->dmareq < 0)
+	if (!chdat || chdat->dma_data.dmareq < 0)
 		return;
 
 	reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP);
-	reg &= ~(0x1f << (chdat->dmareq * 5));
+	reg &= ~(0x1f << (chdat->dma_data.dmareq * 5));
 	musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg);
 
-	chdat->dmareq = -1;
-	chdat->sync_dev = -1;
+	chdat->dma_data.dmareq = -1;
+	chdat->dma_data.sync_dev = -1;
 }
 
 static struct dma_channel *dma_channel_pool[MAX_DMAREQ];
@@ -492,11 +489,13 @@ tusb_omap_dma_allocate(struct dma_controller *c,
 {
 	int ret, i;
 	const char		*dev_name;
+	void			*cb_data;
 	struct tusb_omap_dma	*tusb_dma;
 	struct musb		*musb;
 	void __iomem		*tbase;
 	struct dma_channel	*channel = NULL;
 	struct tusb_omap_dma_ch	*chdat = NULL;
+	struct tusb_dma_data	*dma_data = NULL;
 	u32			reg;
 
 	tusb_dma = container_of(c, struct tusb_omap_dma, controller);
@@ -529,56 +528,62 @@ tusb_omap_dma_allocate(struct dma_controller *c,
 	if (!channel)
 		return NULL;
 
-	if (tx) {
-		chdat->tx = 1;
-		dev_name = "TUSB transmit";
-	} else {
-		chdat->tx = 0;
-		dev_name = "TUSB receive";
-	}
-
 	chdat->musb = tusb_dma->controller.musb;
 	chdat->tbase = tusb_dma->tbase;
 	chdat->hw_ep = hw_ep;
 	chdat->epnum = hw_ep->epnum;
-	chdat->dmareq = -1;
 	chdat->completed_len = 0;
 	chdat->tusb_dma = tusb_dma;
+	if (tx)
+		chdat->tx = 1;
+	else
+		chdat->tx = 0;
 
 	channel->max_len = 0x7fffffff;
 	channel->desired_mode = 0;
 	channel->actual_len = 0;
 
 	if (tusb_dma->multichannel) {
+		dma_data = &chdat->dma_data;
 		ret = tusb_omap_dma_allocate_dmareq(chdat);
 		if (ret != 0)
 			goto free_dmareq;
 
-		ret = omap_request_dma(chdat->sync_dev, dev_name,
-				tusb_omap_dma_cb, channel, &chdat->ch);
-		if (ret != 0)
-			goto free_dmareq;
-	} else if (tusb_dma->ch == -1) {
-		tusb_dma->dmareq = 0;
-		tusb_dma->sync_dev = OMAP24XX_DMA_EXT_DMAREQ0;
+		if (chdat->tx)
+			dev_name = "TUSB transmit";
+		else
+			dev_name = "TUSB receive";
+		cb_data = channel;
+	} else if (tusb_dma->dma_data.ch == -1) {
+		dma_data = &tusb_dma->dma_data;
+		dma_data->dmareq = 0;
+		dma_data->sync_dev = OMAP24XX_DMA_EXT_DMAREQ0;
 
+		dev_name = "TUSB shared";
 		/* Callback data gets set later in the shared dmareq case */
-		ret = omap_request_dma(tusb_dma->sync_dev, "TUSB shared",
-				tusb_omap_dma_cb, NULL, &tusb_dma->ch);
+		cb_data = NULL;
+
+		chdat->dma_data.dmareq = -1;
+		chdat->dma_data.ch = -1;
+		chdat->dma_data.sync_dev = -1;
+	}
+
+	if (dma_data) {
+		ret = omap_request_dma(dma_data->sync_dev, dev_name,
+				       tusb_omap_dma_cb, cb_data,
+				       &dma_data->ch);
 		if (ret != 0)
 			goto free_dmareq;
-
-		chdat->dmareq = -1;
-		chdat->ch = -1;
+	} else {
+		/* Already allocated shared, single DMA channel. */
+		dma_data = &tusb_dma->dma_data;
 	}
 
 	dev_dbg(musb->controller, "ep%i %s dma: %s dma%i dmareq%i sync%i\n",
 		chdat->epnum,
 		chdat->tx ? "tx" : "rx",
-		chdat->ch >= 0 ? "dedicated" : "shared",
-		chdat->ch >= 0 ? chdat->ch : tusb_dma->ch,
-		chdat->dmareq >= 0 ? chdat->dmareq : tusb_dma->dmareq,
-		chdat->sync_dev >= 0 ? chdat->sync_dev : tusb_dma->sync_dev);
+		chdat->dma_data.ch >= 0 ? "dedicated" : "shared",
+		dma_data->ch, dma_data->dmareq, dma_data->sync_dev);
 
 	return channel;
 
@@ -598,7 +603,8 @@ static void tusb_omap_dma_release(struct dma_channel *channel)
 	void __iomem		*tbase = musb->ctrl_base;
 	u32			reg;
 
-	dev_dbg(musb->controller, "ep%i ch%i\n", chdat->epnum, chdat->ch);
+	dev_dbg(musb->controller, "ep%i ch%i\n", chdat->epnum,
+		chdat->dma_data.ch);
 
 	reg = musb_readl(tbase, TUSB_DMA_INT_MASK);
 	if (chdat->tx)
@@ -616,13 +622,13 @@ static void tusb_omap_dma_release(struct dma_channel *channel)
 
 	channel->status = MUSB_DMA_STATUS_UNKNOWN;
 
-	if (chdat->ch >= 0) {
-		omap_stop_dma(chdat->ch);
-		omap_free_dma(chdat->ch);
-		chdat->ch = -1;
+	if (chdat->dma_data.ch >= 0) {
+		omap_stop_dma(chdat->dma_data.ch);
+		omap_free_dma(chdat->dma_data.ch);
+		chdat->dma_data.ch = -1;
 	}
 
-	if (chdat->dmareq >= 0)
+	if (chdat->dma_data.dmareq >= 0)
 		tusb_omap_dma_free_dmareq(chdat);
 
 	channel = NULL;
@@ -642,8 +648,8 @@ void tusb_dma_controller_destroy(struct dma_controller *c)
 		}
 	}
 
-	if (tusb_dma && !tusb_dma->multichannel && tusb_dma->ch >= 0)
-		omap_free_dma(tusb_dma->ch);
+	if (tusb_dma && !tusb_dma->multichannel && tusb_dma->dma_data.ch >= 0)
+		omap_free_dma(tusb_dma->dma_data.ch);
 
 	kfree(tusb_dma);
 }
@@ -673,9 +679,9 @@ tusb_dma_controller_create(struct musb *musb, void __iomem *base)
 	tusb_dma->controller.musb = musb;
 	tusb_dma->tbase = musb->ctrl_base;
 
-	tusb_dma->ch = -1;
-	tusb_dma->dmareq = -1;
-	tusb_dma->sync_dev = -1;
+	tusb_dma->dma_data.ch = -1;
+	tusb_dma->dma_data.dmareq = -1;
+	tusb_dma->dma_data.sync_dev = -1;
 
 	tusb_dma->controller.channel_alloc = tusb_omap_dma_allocate;
 	tusb_dma->controller.channel_release = tusb_omap_dma_release;