From 32273f50608e9b98116622e32187cbd139c09716 Mon Sep 17 00:00:00 2001 From: Russell King Date: Thu, 12 Jan 2012 12:45:00 +0000 Subject: NET: sa11x0-ir: convert to use scatterlist DMA API Convert the sa11x0 IrDA driver to use the scatterlist DMA API. This is a preparatory patch for converting the driver to use the DMA engine API, which requires a struct scatterlist for every transfer. Signed-off-by: Russell King --- drivers/net/irda/sa1100_ir.c | 42 +++++++++++++++++++++--------------------- 1 file changed, 21 insertions(+), 21 deletions(-) diff --git a/drivers/net/irda/sa1100_ir.c b/drivers/net/irda/sa1100_ir.c index d428dd0a8bce..86d296ed69a7 100644 --- a/drivers/net/irda/sa1100_ir.c +++ b/drivers/net/irda/sa1100_ir.c @@ -45,7 +45,7 @@ static int max_rate = 4000000; struct sa1100_buf { struct sk_buff *skb; - dma_addr_t dma; + struct scatterlist sg; dma_regs_t *regs; }; @@ -98,10 +98,8 @@ static int sa1100_irda_rx_alloc(struct sa1100_irda *si) */ skb_reserve(si->dma_rx.skb, 1); - si->dma_rx.dma = dma_map_single(si->dev, si->dma_rx.skb->data, - HPSIR_MAX_RXLEN, - DMA_FROM_DEVICE); - if (dma_mapping_error(si->dev, si->dma_rx.dma)) { + sg_set_buf(&si->dma_rx.sg, si->dma_rx.skb->data, HPSIR_MAX_RXLEN); + if (dma_map_sg(si->dev, &si->dma_rx.sg, 1, DMA_FROM_DEVICE) == 0) { dev_kfree_skb_any(si->dma_rx.skb); return -ENOMEM; } @@ -129,7 +127,8 @@ static void sa1100_irda_rx_dma_start(struct sa1100_irda *si) * Enable the DMA, receiver and receive interrupt. */ sa1100_clear_dma(si->dma_rx.regs); - sa1100_start_dma(si->dma_rx.regs, si->dma_rx.dma, HPSIR_MAX_RXLEN); + sa1100_start_dma(si->dma_rx.regs, sg_dma_address(&si->dma_rx.sg), + sg_dma_len(&si->dma_rx.sg)); Ser2HSCR0 = HSCR0_HSSP | HSCR0_RXE; } @@ -296,8 +295,8 @@ static void sa1100_irda_firtxdma_irq(void *id) /* Account and free the packet. */ skb = si->dma_tx.skb; if (skb) { - dma_unmap_single(si->dev, si->dma_tx.dma, skb->len, - DMA_TO_DEVICE); + dma_unmap_sg(si->dev, &si->dma_tx.sg, 1, + DMA_TO_DEVICE); dev->stats.tx_packets ++; dev->stats.tx_bytes += skb->len; dev_kfree_skb_irq(skb); @@ -317,9 +316,8 @@ static int sa1100_irda_fir_tx_start(struct sk_buff *skb, struct net_device *dev, int mtt = irda_get_mtt(skb); si->dma_tx.skb = skb; - si->dma_tx.dma = dma_map_single(si->dev, skb->data, skb->len, - DMA_TO_DEVICE); - if (dma_mapping_error(si->dev, si->dma_tx.dma)) { + sg_set_buf(&si->dma_tx.sg, skb->data, skb->len); + if (dma_map_sg(si->dev, &si->dma_tx.sg, 1, DMA_TO_DEVICE) == 0) { si->dma_tx.skb = NULL; netif_wake_queue(dev); dev->stats.tx_dropped++; @@ -327,7 +325,8 @@ static int sa1100_irda_fir_tx_start(struct sk_buff *skb, struct net_device *dev, return NETDEV_TX_OK; } - sa1100_start_dma(si->dma_tx.regs, si->dma_tx.dma, skb->len); + sa1100_start_dma(si->dma_tx.regs, sg_dma_address(&si->dma_tx.sg), + sg_dma_len(&si->dma_tx.sg)); /* * If we have a mean turn-around time, impose the specified @@ -357,10 +356,10 @@ static void sa1100_irda_fir_error(struct sa1100_irda *si, struct net_device *dev * Get the current data position. */ dma_addr = sa1100_get_dma_pos(si->dma_rx.regs); - len = dma_addr - si->dma_rx.dma; + len = dma_addr - sg_dma_address(&si->dma_rx.sg); if (len > HPSIR_MAX_RXLEN) len = HPSIR_MAX_RXLEN; - dma_unmap_single(si->dev, si->dma_rx.dma, len, DMA_FROM_DEVICE); + dma_unmap_sg(si->dev, &si->dma_rx.sg, 1, DMA_FROM_DEVICE); do { /* @@ -408,9 +407,7 @@ static void sa1100_irda_fir_error(struct sa1100_irda *si, struct net_device *dev * Remap the buffer - it was previously mapped, and we * hope that this succeeds. */ - si->dma_rx.dma = dma_map_single(si->dev, si->dma_rx.skb->data, - HPSIR_MAX_RXLEN, - DMA_FROM_DEVICE); + dma_map_sg(si->dev, &si->dma_rx.sg, 1, DMA_FROM_DEVICE); } } @@ -786,16 +783,16 @@ static int sa1100_irda_stop(struct net_device *dev) */ skb = si->dma_rx.skb; if (skb) { - dma_unmap_single(si->dev, si->dma_rx.dma, HPSIR_MAX_RXLEN, - DMA_FROM_DEVICE); + dma_unmap_sg(si->dev, &si->dma_rx.sg, 1, + DMA_FROM_DEVICE); dev_kfree_skb(skb); si->dma_rx.skb = NULL; } skb = si->dma_tx.skb; if (skb) { - dma_unmap_single(si->dev, si->dma_tx.dma, skb->len, - DMA_TO_DEVICE); + dma_unmap_sg(si->dev, &si->dma_tx.sg, 1, + DMA_TO_DEVICE); dev_kfree_skb(skb); si->dma_tx.skb = NULL; } @@ -871,6 +868,9 @@ static int sa1100_irda_probe(struct platform_device *pdev) si->dev = &pdev->dev; si->pdata = pdev->dev.platform_data; + sg_init_table(&si->dma_rx.sg, 1); + sg_init_table(&si->dma_tx.sg, 1); + /* * Initialise the HP-SIR buffers */ -- cgit v1.2.3