From bf95154ff6c84e04afd9ba7f2b54a4628beefdb9 Mon Sep 17 00:00:00 2001 From: Russell King Date: Fri, 13 Jan 2012 11:48:13 +0000 Subject: [PATCH] NET: sa11x0-ir: convert sa11x0-ir driver to use DMA engine API Convert the sa11x0 IrDA driver to use the sa11x0 DMA engine driver rather than our own platform specific DMA API. Signed-off-by: Russell King --- drivers/net/irda/Kconfig | 2 +- drivers/net/irda/sa1100_ir.c | 120 ++++++++++++++++++++++++++--------- 2 files changed, 92 insertions(+), 30 deletions(-) diff --git a/drivers/net/irda/Kconfig b/drivers/net/irda/Kconfig index e535137eb2d0..468047866c8c 100644 --- a/drivers/net/irda/Kconfig +++ b/drivers/net/irda/Kconfig @@ -356,7 +356,7 @@ config VLSI_FIR config SA1100_FIR tristate "SA1100 Internal IR" - depends on ARCH_SA1100 && IRDA + depends on ARCH_SA1100 && IRDA && DMA_SA11X0 config VIA_FIR tristate "VIA VT8231/VT1211 SIR/MIR/FIR" diff --git a/drivers/net/irda/sa1100_ir.c b/drivers/net/irda/sa1100_ir.c index 9c748f38b9d5..620a48d00e2b 100644 --- a/drivers/net/irda/sa1100_ir.c +++ b/drivers/net/irda/sa1100_ir.c @@ -30,12 +30,13 @@ #include #include #include +#include +#include #include #include #include -#include #include #include @@ -47,7 +48,8 @@ struct sa1100_buf { struct device *dev; struct sk_buff *skb; struct scatterlist sg; - dma_regs_t *regs; + struct dma_chan *chan; + dma_cookie_t cookie; }; struct sa1100_irda { @@ -79,6 +81,75 @@ static int sa1100_irda_set_speed(struct sa1100_irda *, int); #define HPSIR_MAX_RXLEN 2047 +static struct dma_slave_config sa1100_irda_fir_rx = { + .direction = DMA_FROM_DEVICE, + .src_addr = __PREG(Ser2HSDR), + .src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE, + .src_maxburst = 8, +}; + +static struct dma_slave_config sa1100_irda_fir_tx = { + .direction = DMA_TO_DEVICE, + .dst_addr = __PREG(Ser2HSDR), + .dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE, + .dst_maxburst = 8, +}; + +static unsigned sa1100_irda_dma_xferred(struct sa1100_buf *buf) +{ + struct dma_chan *chan = buf->chan; + struct dma_tx_state state; + enum dma_status status; + + status = chan->device->device_tx_status(chan, buf->cookie, &state); + if (status != DMA_PAUSED) + return 0; + + return sg_dma_len(&buf->sg) - state.residue; +} + +static int sa1100_irda_dma_request(struct device *dev, struct sa1100_buf *buf, + const char *name, struct dma_slave_config *cfg) +{ + dma_cap_mask_t m; + int ret; + + dma_cap_zero(m); + dma_cap_set(DMA_SLAVE, m); + + buf->chan = dma_request_channel(m, sa11x0_dma_filter_fn, (void *)name); + if (!buf->chan) { + dev_err(dev, "unable to request DMA channel for %s\n", + name); + return -ENOENT; + } + + ret = dmaengine_slave_config(buf->chan, cfg); + if (ret) + dev_warn(dev, "DMA slave_config for %s returned %d\n", + name, ret); + + buf->dev = buf->chan->device->dev; + + return 0; +} + +static void sa1100_irda_dma_start(struct sa1100_buf *buf, + enum dma_transfer_direction dir, dma_async_tx_callback cb, void *cb_p) +{ + struct dma_async_tx_descriptor *desc; + struct dma_chan *chan = buf->chan; + + desc = chan->device->device_prep_slave_sg(chan, &buf->sg, 1, dir, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (desc) { + desc->callback = cb; + desc->callback_param = cb_p; + buf->cookie = dmaengine_submit(desc); + dma_async_issue_pending(chan); + } +} + /* * Allocate and map the receive buffer, unless it is already allocated. */ @@ -127,9 +198,9 @@ 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, sg_dma_address(&si->dma_rx.sg), - sg_dma_len(&si->dma_rx.sg)); + dmaengine_terminate_all(si->dma_rx.chan); + sa1100_irda_dma_start(&si->dma_rx, DMA_DEV_TO_MEM, NULL, NULL); + Ser2HSCR0 = HSCR0_HSSP | HSCR0_RXE; } @@ -326,8 +397,7 @@ 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, sg_dma_address(&si->dma_tx.sg), - sg_dma_len(&si->dma_tx.sg)); + sa1100_irda_dma_start(&si->dma_tx, DMA_MEM_TO_DEV, sa1100_irda_firtxdma_irq, dev); /* * If we have a mean turn-around time, impose the specified @@ -345,7 +415,6 @@ static int sa1100_irda_fir_tx_start(struct sk_buff *skb, struct net_device *dev, static void sa1100_irda_fir_error(struct sa1100_irda *si, struct net_device *dev) { struct sk_buff *skb = si->dma_rx.skb; - dma_addr_t dma_addr; unsigned int len, stat, data; if (!skb) { @@ -356,8 +425,7 @@ 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 - sg_dma_address(&si->dma_rx.sg); + len = sa1100_irda_dma_xferred(&si->dma_rx); if (len > HPSIR_MAX_RXLEN) len = HPSIR_MAX_RXLEN; dma_unmap_sg(si->dma_rx.dev, &si->dma_rx.sg, 1, DMA_FROM_DEVICE); @@ -421,7 +489,7 @@ static irqreturn_t sa1100_irda_fir_irq(struct net_device *dev, struct sa1100_ird /* * Stop RX DMA */ - sa1100_stop_dma(si->dma_rx.regs); + dmaengine_pause(si->dma_rx.chan); /* * Framing error - we throw away the packet completely. @@ -476,11 +544,9 @@ static int sa1100_irda_set_speed(struct sa1100_irda *si, int speed) case 57600: case 115200: brd = 3686400 / (16 * speed) - 1; - /* - * Stop the receive DMA. - */ + /* Stop the receive DMA, and configure transmit. */ if (IS_FIR(si)) - sa1100_stop_dma(si->dma_rx.regs); + dmaengine_terminate_all(si->dma_rx.chan); local_irq_save(flags); @@ -698,8 +764,8 @@ static void sa1100_irda_shutdown(struct sa1100_irda *si) /* * Stop all DMA activity. */ - sa1100_stop_dma(si->dma_rx.regs); - sa1100_stop_dma(si->dma_tx.regs); + dmaengine_terminate_all(si->dma_rx.chan); + dmaengine_terminate_all(si->dma_tx.chan); /* Disable the port. */ Ser2UTCR3 = 0; @@ -716,20 +782,16 @@ static int sa1100_irda_start(struct net_device *dev) si->speed = 9600; - err = sa1100_request_dma(DMA_Ser2HSSPRd, "IrDA receive", - NULL, NULL, &si->dma_rx.regs); + err = sa1100_irda_dma_request(si->dev, &si->dma_rx, "Ser2ICPRc", + &sa1100_irda_fir_rx); if (err) goto err_rx_dma; - err = sa1100_request_dma(DMA_Ser2HSSPWr, "IrDA transmit", - sa1100_irda_firtxdma_irq, dev, - &si->dma_tx.regs); + err = sa1100_irda_dma_request(si->dev, &si->dma_tx, "Ser2ICPTr", + &sa1100_irda_sir_tx); if (err) goto err_tx_dma; - si->dma_rx.dev = si->dev; - si->dma_tx.dev = si->dev; - /* * Setup the serial port for the specified speed. */ @@ -764,9 +826,9 @@ err_irlap: si->open = 0; sa1100_irda_shutdown(si); err_startup: - sa1100_free_dma(si->dma_tx.regs); + dma_release_channel(si->dma_tx.chan); err_tx_dma: - sa1100_free_dma(si->dma_rx.regs); + dma_release_channel(si->dma_rx.chan); err_rx_dma: return err; } @@ -810,8 +872,8 @@ static int sa1100_irda_stop(struct net_device *dev) /* * Free resources */ - sa1100_free_dma(si->dma_tx.regs); - sa1100_free_dma(si->dma_rx.regs); + dma_release_channel(si->dma_tx.chan); + dma_release_channel(si->dma_rx.chan); free_irq(dev->irq, dev); sa1100_set_power(si, 0); -- 2.20.1