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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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serial: sh-sci: Add DMA support.
Support using DMA for sending and receiving data over SCI(F) interfaces of various SH SoCs. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Guennadi Liakhovetski
Paul Mundt
parent
c014906a87
commit
73a19e4c03
@ -1009,6 +1009,10 @@ config SERIAL_SH_SCI_CONSOLE
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depends on SERIAL_SH_SCI=y
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select SERIAL_CORE_CONSOLE
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config SERIAL_SH_SCI_DMA
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bool "DMA support"
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depends on SERIAL_SH_SCI && SH_DMAE && EXPERIMENTAL
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config SERIAL_PNX8XXX
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bool "Enable PNX8XXX SoCs' UART Support"
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depends on MIPS && (SOC_PNX8550 || SOC_PNX833X)
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@ -48,6 +48,9 @@
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#include <linux/ctype.h>
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#include <linux/err.h>
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#include <linux/list.h>
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#include <linux/dmaengine.h>
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#include <linux/scatterlist.h>
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#include <linux/timer.h>
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#ifdef CONFIG_SUPERH
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#include <asm/sh_bios.h>
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@ -84,6 +87,27 @@ struct sci_port {
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struct clk *dclk;
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struct list_head node;
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struct dma_chan *chan_tx;
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struct dma_chan *chan_rx;
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#ifdef CONFIG_SERIAL_SH_SCI_DMA
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struct device *dma_dev;
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enum sh_dmae_slave_chan_id slave_tx;
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enum sh_dmae_slave_chan_id slave_rx;
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struct dma_async_tx_descriptor *desc_tx;
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struct dma_async_tx_descriptor *desc_rx[2];
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dma_cookie_t cookie_tx;
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dma_cookie_t cookie_rx[2];
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dma_cookie_t active_rx;
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struct scatterlist sg_tx;
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unsigned int sg_len_tx;
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struct scatterlist sg_rx[2];
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size_t buf_len_rx;
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struct sh_dmae_slave param_tx;
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struct sh_dmae_slave param_rx;
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struct work_struct work_tx;
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struct work_struct work_rx;
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struct timer_list rx_timer;
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#endif
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};
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struct sh_sci_priv {
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@ -269,29 +293,44 @@ static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
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defined(CONFIG_CPU_SUBTYPE_SH7780) || \
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defined(CONFIG_CPU_SUBTYPE_SH7785) || \
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defined(CONFIG_CPU_SUBTYPE_SH7786)
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static inline int scif_txroom(struct uart_port *port)
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static int scif_txfill(struct uart_port *port)
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{
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return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0xff);
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return sci_in(port, SCTFDR) & 0xff;
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}
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static inline int scif_rxroom(struct uart_port *port)
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static int scif_txroom(struct uart_port *port)
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{
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return SCIF_TXROOM_MAX - scif_txfill(port);
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}
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static int scif_rxfill(struct uart_port *port)
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{
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return sci_in(port, SCRFDR) & 0xff;
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}
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#elif defined(CONFIG_CPU_SUBTYPE_SH7763)
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static inline int scif_txroom(struct uart_port *port)
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static int scif_txfill(struct uart_port *port)
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{
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if ((port->mapbase == 0xffe00000) ||
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(port->mapbase == 0xffe08000)) {
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if (port->mapbase == 0xffe00000 ||
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port->mapbase == 0xffe08000)
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/* SCIF0/1*/
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return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0xff);
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} else {
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return sci_in(port, SCTFDR) & 0xff;
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else
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/* SCIF2 */
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return SCIF2_TXROOM_MAX - (sci_in(port, SCFDR) >> 8);
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}
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return sci_in(port, SCFDR) >> 8;
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}
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static inline int scif_rxroom(struct uart_port *port)
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static int scif_txroom(struct uart_port *port)
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{
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if (port->mapbase == 0xffe00000 ||
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port->mapbase == 0xffe08000)
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/* SCIF0/1*/
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return SCIF_TXROOM_MAX - scif_txfill(port);
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else
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/* SCIF2 */
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return SCIF2_TXROOM_MAX - scif_txfill(port);
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}
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static int scif_rxfill(struct uart_port *port)
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{
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if ((port->mapbase == 0xffe00000) ||
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(port->mapbase == 0xffe08000)) {
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@ -303,23 +342,33 @@ static inline int scif_rxroom(struct uart_port *port)
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}
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}
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#else
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static inline int scif_txroom(struct uart_port *port)
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static int scif_txfill(struct uart_port *port)
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{
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return SCIF_TXROOM_MAX - (sci_in(port, SCFDR) >> 8);
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return sci_in(port, SCFDR) >> 8;
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}
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static inline int scif_rxroom(struct uart_port *port)
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static int scif_txroom(struct uart_port *port)
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{
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return SCIF_TXROOM_MAX - scif_txfill(port);
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}
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static int scif_rxfill(struct uart_port *port)
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{
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return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
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}
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#endif
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static inline int sci_txroom(struct uart_port *port)
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static int sci_txfill(struct uart_port *port)
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{
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return (sci_in(port, SCxSR) & SCI_TDRE) != 0;
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return !(sci_in(port, SCxSR) & SCI_TDRE);
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}
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static inline int sci_rxroom(struct uart_port *port)
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static int sci_txroom(struct uart_port *port)
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{
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return !sci_txfill(port);
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}
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static int sci_rxfill(struct uart_port *port)
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{
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return (sci_in(port, SCxSR) & SCxSR_RDxF(port)) != 0;
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}
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@ -406,9 +455,9 @@ static inline void sci_receive_chars(struct uart_port *port)
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while (1) {
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if (port->type == PORT_SCI)
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count = sci_rxroom(port);
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count = sci_rxfill(port);
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else
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count = scif_rxroom(port);
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count = scif_rxfill(port);
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/* Don't copy more bytes than there is room for in the buffer */
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count = tty_buffer_request_room(tty, count);
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@ -453,10 +502,10 @@ static inline void sci_receive_chars(struct uart_port *port)
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}
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/* Store data and status */
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if (status&SCxSR_FER(port)) {
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if (status & SCxSR_FER(port)) {
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flag = TTY_FRAME;
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dev_notice(port->dev, "frame error\n");
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} else if (status&SCxSR_PER(port)) {
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} else if (status & SCxSR_PER(port)) {
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flag = TTY_PARITY;
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dev_notice(port->dev, "parity error\n");
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} else
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@ -618,13 +667,39 @@ static inline int sci_handle_breaks(struct uart_port *port)
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return copied;
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}
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static irqreturn_t sci_rx_interrupt(int irq, void *port)
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static irqreturn_t sci_rx_interrupt(int irq, void *ptr)
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{
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#ifdef CONFIG_SERIAL_SH_SCI_DMA
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struct uart_port *port = ptr;
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struct sci_port *s = to_sci_port(port);
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if (s->chan_rx) {
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unsigned long tout;
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u16 scr = sci_in(port, SCSCR);
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u16 ssr = sci_in(port, SCxSR);
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/* Disable future Rx interrupts */
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sci_out(port, SCSCR, scr & ~SCI_CTRL_FLAGS_RIE);
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/* Clear current interrupt */
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sci_out(port, SCxSR, ssr & ~(1 | SCxSR_RDxF(port)));
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/* Calculate delay for 1.5 DMA buffers */
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tout = (port->timeout - HZ / 50) * s->buf_len_rx * 3 /
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port->fifosize / 2;
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dev_dbg(port->dev, "Rx IRQ: setup timeout in %u ms\n",
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tout * 1000 / HZ);
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if (tout < 2)
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tout = 2;
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mod_timer(&s->rx_timer, jiffies + tout);
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return IRQ_HANDLED;
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}
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#endif
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/* I think sci_receive_chars has to be called irrespective
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* of whether the I_IXOFF is set, otherwise, how is the interrupt
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* to be disabled?
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*/
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sci_receive_chars(port);
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sci_receive_chars(ptr);
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return IRQ_HANDLED;
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}
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@ -680,6 +755,7 @@ static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
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{
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unsigned short ssr_status, scr_status, err_enabled;
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struct uart_port *port = ptr;
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struct sci_port *s = to_sci_port(port);
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irqreturn_t ret = IRQ_NONE;
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ssr_status = sci_in(port, SCxSR);
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@ -687,10 +763,15 @@ static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
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err_enabled = scr_status & (SCI_CTRL_FLAGS_REIE | SCI_CTRL_FLAGS_RIE);
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/* Tx Interrupt */
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if ((ssr_status & SCxSR_TDxE(port)) && (scr_status & SCI_CTRL_FLAGS_TIE))
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if ((ssr_status & SCxSR_TDxE(port)) && (scr_status & SCI_CTRL_FLAGS_TIE) &&
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!s->chan_tx)
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ret = sci_tx_interrupt(irq, ptr);
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/* Rx Interrupt */
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if ((ssr_status & SCxSR_RDxF(port)) && (scr_status & SCI_CTRL_FLAGS_RIE))
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/*
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* Rx Interrupt: if we're using DMA, the DMA controller clears RDF /
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* DR flags
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*/
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if (((ssr_status & SCxSR_RDxF(port)) || s->chan_rx) &&
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(scr_status & SCI_CTRL_FLAGS_RIE))
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ret = sci_rx_interrupt(irq, ptr);
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/* Error Interrupt */
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if ((ssr_status & SCxSR_ERRORS(port)) && err_enabled)
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@ -699,6 +780,10 @@ static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
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if ((ssr_status & SCxSR_BRK(port)) && err_enabled)
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ret = sci_br_interrupt(irq, ptr);
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WARN_ONCE(ret == IRQ_NONE,
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"%s: %d IRQ %d, status %x, control %x\n", __func__,
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irq, port->line, ssr_status, scr_status);
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return ret;
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}
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@ -800,7 +885,9 @@ static void sci_free_irq(struct sci_port *port)
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static unsigned int sci_tx_empty(struct uart_port *port)
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{
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unsigned short status = sci_in(port, SCxSR);
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return status & SCxSR_TEND(port) ? TIOCSER_TEMT : 0;
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unsigned short in_tx_fifo = scif_txfill(port);
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return (status & SCxSR_TEND(port)) && !in_tx_fifo ? TIOCSER_TEMT : 0;
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}
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static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl)
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@ -812,16 +899,299 @@ static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl)
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static unsigned int sci_get_mctrl(struct uart_port *port)
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{
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/* This routine is used for geting signals of: DTR, DCD, DSR, RI,
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/* This routine is used for getting signals of: DTR, DCD, DSR, RI,
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and CTS/RTS */
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return TIOCM_DTR | TIOCM_RTS | TIOCM_DSR;
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}
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#ifdef CONFIG_SERIAL_SH_SCI_DMA
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static void sci_dma_tx_complete(void *arg)
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{
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struct sci_port *s = arg;
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struct uart_port *port = &s->port;
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struct circ_buf *xmit = &port->state->xmit;
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unsigned long flags;
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dev_dbg(port->dev, "%s(%d)\n", __func__, port->line);
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spin_lock_irqsave(&port->lock, flags);
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xmit->tail += s->sg_tx.length;
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xmit->tail &= UART_XMIT_SIZE - 1;
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port->icount.tx += s->sg_tx.length;
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async_tx_ack(s->desc_tx);
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s->cookie_tx = -EINVAL;
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s->desc_tx = NULL;
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spin_unlock_irqrestore(&port->lock, flags);
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if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
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uart_write_wakeup(port);
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if (uart_circ_chars_pending(xmit))
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schedule_work(&s->work_tx);
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}
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/* Locking: called with port lock held */
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static int sci_dma_rx_push(struct sci_port *s, struct tty_struct *tty,
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size_t count)
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{
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struct uart_port *port = &s->port;
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int i, active, room;
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room = tty_buffer_request_room(tty, count);
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if (s->active_rx == s->cookie_rx[0]) {
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active = 0;
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} else if (s->active_rx == s->cookie_rx[1]) {
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active = 1;
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} else {
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dev_err(port->dev, "cookie %d not found!\n", s->active_rx);
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return 0;
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}
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if (room < count)
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dev_warn(port->dev, "Rx overrun: dropping %u bytes\n",
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count - room);
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if (!room)
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return room;
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for (i = 0; i < room; i++)
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tty_insert_flip_char(tty, ((u8 *)sg_virt(&s->sg_rx[active]))[i],
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TTY_NORMAL);
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port->icount.rx += room;
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return room;
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}
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static void sci_dma_rx_complete(void *arg)
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{
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struct sci_port *s = arg;
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struct uart_port *port = &s->port;
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struct tty_struct *tty = port->state->port.tty;
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unsigned long flags;
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int count;
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dev_dbg(port->dev, "%s(%d)\n", __func__, port->line);
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spin_lock_irqsave(&port->lock, flags);
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count = sci_dma_rx_push(s, tty, s->buf_len_rx);
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mod_timer(&s->rx_timer, jiffies + msecs_to_jiffies(5));
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spin_unlock_irqrestore(&port->lock, flags);
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if (count)
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tty_flip_buffer_push(tty);
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schedule_work(&s->work_rx);
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}
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static void sci_start_rx(struct uart_port *port);
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static void sci_start_tx(struct uart_port *port);
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static void sci_rx_dma_release(struct sci_port *s, bool enable_pio)
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{
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struct dma_chan *chan = s->chan_rx;
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struct uart_port *port = &s->port;
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unsigned long flags;
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s->chan_rx = NULL;
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s->cookie_rx[0] = s->cookie_rx[1] = -EINVAL;
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dma_release_channel(chan);
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dma_free_coherent(port->dev, s->buf_len_rx * 2,
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sg_virt(&s->sg_rx[0]), sg_dma_address(&s->sg_rx[0]));
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if (enable_pio)
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sci_start_rx(port);
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}
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static void sci_tx_dma_release(struct sci_port *s, bool enable_pio)
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{
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struct dma_chan *chan = s->chan_tx;
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struct uart_port *port = &s->port;
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unsigned long flags;
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s->chan_tx = NULL;
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s->cookie_tx = -EINVAL;
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dma_release_channel(chan);
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if (enable_pio)
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sci_start_tx(port);
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}
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static void sci_submit_rx(struct sci_port *s)
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{
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struct dma_chan *chan = s->chan_rx;
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int i;
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for (i = 0; i < 2; i++) {
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struct scatterlist *sg = &s->sg_rx[i];
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struct dma_async_tx_descriptor *desc;
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desc = chan->device->device_prep_slave_sg(chan,
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sg, 1, DMA_FROM_DEVICE, DMA_PREP_INTERRUPT);
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if (desc) {
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s->desc_rx[i] = desc;
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desc->callback = sci_dma_rx_complete;
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desc->callback_param = s;
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s->cookie_rx[i] = desc->tx_submit(desc);
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}
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if (!desc || s->cookie_rx[i] < 0) {
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if (i) {
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async_tx_ack(s->desc_rx[0]);
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s->cookie_rx[0] = -EINVAL;
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}
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if (desc) {
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async_tx_ack(desc);
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s->cookie_rx[i] = -EINVAL;
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}
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dev_warn(s->port.dev,
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"failed to re-start DMA, using PIO\n");
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sci_rx_dma_release(s, true);
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return;
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}
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}
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s->active_rx = s->cookie_rx[0];
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dma_async_issue_pending(chan);
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}
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static void work_fn_rx(struct work_struct *work)
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{
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struct sci_port *s = container_of(work, struct sci_port, work_rx);
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struct uart_port *port = &s->port;
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struct dma_async_tx_descriptor *desc;
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int new;
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if (s->active_rx == s->cookie_rx[0]) {
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new = 0;
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} else if (s->active_rx == s->cookie_rx[1]) {
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new = 1;
|
||||
} else {
|
||||
dev_err(port->dev, "cookie %d not found!\n", s->active_rx);
|
||||
return;
|
||||
}
|
||||
desc = s->desc_rx[new];
|
||||
|
||||
if (dma_async_is_tx_complete(s->chan_rx, s->active_rx, NULL, NULL) !=
|
||||
DMA_SUCCESS) {
|
||||
/* Handle incomplete DMA receive */
|
||||
struct tty_struct *tty = port->state->port.tty;
|
||||
struct dma_chan *chan = s->chan_rx;
|
||||
struct sh_desc *sh_desc = container_of(desc, struct sh_desc,
|
||||
async_tx);
|
||||
unsigned long flags;
|
||||
int count;
|
||||
|
||||
chan->device->device_terminate_all(chan);
|
||||
dev_dbg(port->dev, "Read %u bytes with cookie %d\n",
|
||||
sh_desc->partial, sh_desc->cookie);
|
||||
|
||||
spin_lock_irqsave(&port->lock, flags);
|
||||
count = sci_dma_rx_push(s, tty, sh_desc->partial);
|
||||
spin_unlock_irqrestore(&port->lock, flags);
|
||||
|
||||
if (count)
|
||||
tty_flip_buffer_push(tty);
|
||||
|
||||
sci_submit_rx(s);
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
s->cookie_rx[new] = desc->tx_submit(desc);
|
||||
if (s->cookie_rx[new] < 0) {
|
||||
dev_warn(port->dev, "Failed submitting Rx DMA descriptor\n");
|
||||
sci_rx_dma_release(s, true);
|
||||
return;
|
||||
}
|
||||
|
||||
dev_dbg(port->dev, "%s: cookie %d #%d\n", __func__,
|
||||
s->cookie_rx[new], new);
|
||||
|
||||
s->active_rx = s->cookie_rx[!new];
|
||||
}
|
||||
|
||||
static void work_fn_tx(struct work_struct *work)
|
||||
{
|
||||
struct sci_port *s = container_of(work, struct sci_port, work_tx);
|
||||
struct dma_async_tx_descriptor *desc;
|
||||
struct dma_chan *chan = s->chan_tx;
|
||||
struct uart_port *port = &s->port;
|
||||
struct circ_buf *xmit = &port->state->xmit;
|
||||
struct scatterlist *sg = &s->sg_tx;
|
||||
|
||||
/*
|
||||
* DMA is idle now.
|
||||
* Port xmit buffer is already mapped, and it is one page... Just adjust
|
||||
* offsets and lengths. Since it is a circular buffer, we have to
|
||||
* transmit till the end, and then the rest. Take the port lock to get a
|
||||
* consistent xmit buffer state.
|
||||
*/
|
||||
spin_lock_irq(&port->lock);
|
||||
sg->offset = xmit->tail & (UART_XMIT_SIZE - 1);
|
||||
sg->dma_address = (sg_dma_address(sg) & ~(UART_XMIT_SIZE - 1)) +
|
||||
sg->offset;
|
||||
sg->length = min((int)CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE),
|
||||
CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE));
|
||||
sg->dma_length = sg->length;
|
||||
spin_unlock_irq(&port->lock);
|
||||
|
||||
BUG_ON(!sg->length);
|
||||
|
||||
desc = chan->device->device_prep_slave_sg(chan,
|
||||
sg, s->sg_len_tx, DMA_TO_DEVICE,
|
||||
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
|
||||
if (!desc) {
|
||||
/* switch to PIO */
|
||||
sci_tx_dma_release(s, true);
|
||||
return;
|
||||
}
|
||||
|
||||
dma_sync_sg_for_device(port->dev, sg, 1, DMA_TO_DEVICE);
|
||||
|
||||
spin_lock_irq(&port->lock);
|
||||
s->desc_tx = desc;
|
||||
desc->callback = sci_dma_tx_complete;
|
||||
desc->callback_param = s;
|
||||
spin_unlock_irq(&port->lock);
|
||||
s->cookie_tx = desc->tx_submit(desc);
|
||||
if (s->cookie_tx < 0) {
|
||||
dev_warn(port->dev, "Failed submitting Tx DMA descriptor\n");
|
||||
/* switch to PIO */
|
||||
sci_tx_dma_release(s, true);
|
||||
return;
|
||||
}
|
||||
|
||||
dev_dbg(port->dev, "%s: %p: %d...%d, cookie %d\n", __func__,
|
||||
xmit->buf, xmit->tail, xmit->head, s->cookie_tx);
|
||||
|
||||
dma_async_issue_pending(chan);
|
||||
}
|
||||
#endif
|
||||
|
||||
static void sci_start_tx(struct uart_port *port)
|
||||
{
|
||||
unsigned short ctrl;
|
||||
|
||||
#ifdef CONFIG_SERIAL_SH_SCI_DMA
|
||||
struct sci_port *s = to_sci_port(port);
|
||||
|
||||
if (s->chan_tx) {
|
||||
if (!uart_circ_empty(&s->port.state->xmit) && s->cookie_tx < 0)
|
||||
schedule_work(&s->work_tx);
|
||||
|
||||
return;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* Set TIE (Transmit Interrupt Enable) bit in SCSCR */
|
||||
ctrl = sci_in(port, SCSCR);
|
||||
ctrl |= SCI_CTRL_FLAGS_TIE;
|
||||
@ -838,13 +1208,12 @@ static void sci_stop_tx(struct uart_port *port)
|
||||
sci_out(port, SCSCR, ctrl);
|
||||
}
|
||||
|
||||
static void sci_start_rx(struct uart_port *port, unsigned int tty_start)
|
||||
static void sci_start_rx(struct uart_port *port)
|
||||
{
|
||||
unsigned short ctrl;
|
||||
unsigned short ctrl = SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE;
|
||||
|
||||
/* Set RIE (Receive Interrupt Enable) bit in SCSCR */
|
||||
ctrl = sci_in(port, SCSCR);
|
||||
ctrl |= SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE;
|
||||
ctrl |= sci_in(port, SCSCR);
|
||||
sci_out(port, SCSCR, ctrl);
|
||||
}
|
||||
|
||||
@ -868,16 +1237,154 @@ static void sci_break_ctl(struct uart_port *port, int break_state)
|
||||
/* Nothing here yet .. */
|
||||
}
|
||||
|
||||
#ifdef CONFIG_SERIAL_SH_SCI_DMA
|
||||
static bool filter(struct dma_chan *chan, void *slave)
|
||||
{
|
||||
struct sh_dmae_slave *param = slave;
|
||||
|
||||
dev_dbg(chan->device->dev, "%s: slave ID %d\n", __func__,
|
||||
param->slave_id);
|
||||
|
||||
if (param->dma_dev == chan->device->dev) {
|
||||
chan->private = param;
|
||||
return true;
|
||||
} else {
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
static void rx_timer_fn(unsigned long arg)
|
||||
{
|
||||
struct sci_port *s = (struct sci_port *)arg;
|
||||
struct uart_port *port = &s->port;
|
||||
|
||||
u16 scr = sci_in(port, SCSCR);
|
||||
sci_out(port, SCSCR, scr | SCI_CTRL_FLAGS_RIE);
|
||||
dev_dbg(port->dev, "DMA Rx timed out\n");
|
||||
schedule_work(&s->work_rx);
|
||||
}
|
||||
|
||||
static void sci_request_dma(struct uart_port *port)
|
||||
{
|
||||
struct sci_port *s = to_sci_port(port);
|
||||
struct sh_dmae_slave *param;
|
||||
struct dma_chan *chan;
|
||||
dma_cap_mask_t mask;
|
||||
int nent;
|
||||
|
||||
dev_dbg(port->dev, "%s: port %d DMA %p\n", __func__,
|
||||
port->line, s->dma_dev);
|
||||
|
||||
if (!s->dma_dev)
|
||||
return;
|
||||
|
||||
dma_cap_zero(mask);
|
||||
dma_cap_set(DMA_SLAVE, mask);
|
||||
|
||||
param = &s->param_tx;
|
||||
|
||||
/* Slave ID, e.g., SHDMA_SLAVE_SCIF0_TX */
|
||||
param->slave_id = s->slave_tx;
|
||||
param->dma_dev = s->dma_dev;
|
||||
|
||||
s->cookie_tx = -EINVAL;
|
||||
chan = dma_request_channel(mask, filter, param);
|
||||
dev_dbg(port->dev, "%s: TX: got channel %p\n", __func__, chan);
|
||||
if (chan) {
|
||||
s->chan_tx = chan;
|
||||
sg_init_table(&s->sg_tx, 1);
|
||||
/* UART circular tx buffer is an aligned page. */
|
||||
BUG_ON((int)port->state->xmit.buf & ~PAGE_MASK);
|
||||
sg_set_page(&s->sg_tx, virt_to_page(port->state->xmit.buf),
|
||||
UART_XMIT_SIZE, (int)port->state->xmit.buf & ~PAGE_MASK);
|
||||
nent = dma_map_sg(port->dev, &s->sg_tx, 1, DMA_TO_DEVICE);
|
||||
if (!nent)
|
||||
sci_tx_dma_release(s, false);
|
||||
else
|
||||
dev_dbg(port->dev, "%s: mapped %d@%p to %x\n", __func__,
|
||||
sg_dma_len(&s->sg_tx),
|
||||
port->state->xmit.buf, sg_dma_address(&s->sg_tx));
|
||||
|
||||
s->sg_len_tx = nent;
|
||||
|
||||
INIT_WORK(&s->work_tx, work_fn_tx);
|
||||
}
|
||||
|
||||
param = &s->param_rx;
|
||||
|
||||
/* Slave ID, e.g., SHDMA_SLAVE_SCIF0_RX */
|
||||
param->slave_id = s->slave_rx;
|
||||
param->dma_dev = s->dma_dev;
|
||||
|
||||
chan = dma_request_channel(mask, filter, param);
|
||||
dev_dbg(port->dev, "%s: RX: got channel %p\n", __func__, chan);
|
||||
if (chan) {
|
||||
dma_addr_t dma[2];
|
||||
void *buf[2];
|
||||
int i;
|
||||
|
||||
s->chan_rx = chan;
|
||||
|
||||
s->buf_len_rx = 2 * max(16, (int)port->fifosize);
|
||||
buf[0] = dma_alloc_coherent(port->dev, s->buf_len_rx * 2,
|
||||
&dma[0], GFP_KERNEL);
|
||||
|
||||
if (!buf[0]) {
|
||||
dev_warn(port->dev,
|
||||
"failed to allocate dma buffer, using PIO\n");
|
||||
sci_rx_dma_release(s, true);
|
||||
return;
|
||||
}
|
||||
|
||||
buf[1] = buf[0] + s->buf_len_rx;
|
||||
dma[1] = dma[0] + s->buf_len_rx;
|
||||
|
||||
for (i = 0; i < 2; i++) {
|
||||
struct scatterlist *sg = &s->sg_rx[i];
|
||||
|
||||
sg_init_table(sg, 1);
|
||||
sg_set_page(sg, virt_to_page(buf[i]), s->buf_len_rx,
|
||||
(int)buf[i] & ~PAGE_MASK);
|
||||
sg->dma_address = dma[i];
|
||||
sg->dma_length = sg->length;
|
||||
}
|
||||
|
||||
INIT_WORK(&s->work_rx, work_fn_rx);
|
||||
setup_timer(&s->rx_timer, rx_timer_fn, (unsigned long)s);
|
||||
|
||||
sci_submit_rx(s);
|
||||
}
|
||||
}
|
||||
|
||||
static void sci_free_dma(struct uart_port *port)
|
||||
{
|
||||
struct sci_port *s = to_sci_port(port);
|
||||
|
||||
if (!s->dma_dev)
|
||||
return;
|
||||
|
||||
if (s->chan_tx)
|
||||
sci_tx_dma_release(s, false);
|
||||
if (s->chan_rx)
|
||||
sci_rx_dma_release(s, false);
|
||||
}
|
||||
#endif
|
||||
|
||||
static int sci_startup(struct uart_port *port)
|
||||
{
|
||||
struct sci_port *s = to_sci_port(port);
|
||||
|
||||
dev_dbg(port->dev, "%s(%d)\n", __func__, port->line);
|
||||
|
||||
if (s->enable)
|
||||
s->enable(port);
|
||||
|
||||
sci_request_irq(s);
|
||||
#ifdef CONFIG_SERIAL_SH_SCI_DMA
|
||||
sci_request_dma(port);
|
||||
#endif
|
||||
sci_start_tx(port);
|
||||
sci_start_rx(port, 1);
|
||||
sci_start_rx(port);
|
||||
|
||||
return 0;
|
||||
}
|
||||
@ -886,8 +1393,13 @@ static void sci_shutdown(struct uart_port *port)
|
||||
{
|
||||
struct sci_port *s = to_sci_port(port);
|
||||
|
||||
dev_dbg(port->dev, "%s(%d)\n", __func__, port->line);
|
||||
|
||||
sci_stop_rx(port);
|
||||
sci_stop_tx(port);
|
||||
#ifdef CONFIG_SERIAL_SH_SCI_DMA
|
||||
sci_free_dma(port);
|
||||
#endif
|
||||
sci_free_irq(s);
|
||||
|
||||
if (s->disable)
|
||||
@ -937,6 +1449,9 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
|
||||
|
||||
sci_out(port, SCSMR, smr_val);
|
||||
|
||||
dev_dbg(port->dev, "%s: SMR %x, t %x, SCSCR %x\n", __func__, smr_val, t,
|
||||
SCSCR_INIT(port));
|
||||
|
||||
if (t > 0) {
|
||||
if (t >= 256) {
|
||||
sci_out(port, SCSMR, (sci_in(port, SCSMR) & ~3) | 1);
|
||||
@ -954,7 +1469,7 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
|
||||
sci_out(port, SCSCR, SCSCR_INIT(port));
|
||||
|
||||
if ((termios->c_cflag & CREAD) != 0)
|
||||
sci_start_rx(port, 0);
|
||||
sci_start_rx(port);
|
||||
}
|
||||
|
||||
static const char *sci_type(struct uart_port *port)
|
||||
@ -1049,19 +1564,21 @@ static void __devinit sci_init_single(struct platform_device *dev,
|
||||
unsigned int index,
|
||||
struct plat_sci_port *p)
|
||||
{
|
||||
sci_port->port.ops = &sci_uart_ops;
|
||||
sci_port->port.iotype = UPIO_MEM;
|
||||
sci_port->port.line = index;
|
||||
struct uart_port *port = &sci_port->port;
|
||||
|
||||
port->ops = &sci_uart_ops;
|
||||
port->iotype = UPIO_MEM;
|
||||
port->line = index;
|
||||
|
||||
switch (p->type) {
|
||||
case PORT_SCIFA:
|
||||
sci_port->port.fifosize = 64;
|
||||
port->fifosize = 64;
|
||||
break;
|
||||
case PORT_SCIF:
|
||||
sci_port->port.fifosize = 16;
|
||||
port->fifosize = 16;
|
||||
break;
|
||||
default:
|
||||
sci_port->port.fifosize = 1;
|
||||
port->fifosize = 1;
|
||||
break;
|
||||
}
|
||||
|
||||
@ -1070,19 +1587,28 @@ static void __devinit sci_init_single(struct platform_device *dev,
|
||||
sci_port->dclk = clk_get(&dev->dev, "peripheral_clk");
|
||||
sci_port->enable = sci_clk_enable;
|
||||
sci_port->disable = sci_clk_disable;
|
||||
sci_port->port.dev = &dev->dev;
|
||||
port->dev = &dev->dev;
|
||||
}
|
||||
|
||||
sci_port->break_timer.data = (unsigned long)sci_port;
|
||||
sci_port->break_timer.function = sci_break_timer;
|
||||
init_timer(&sci_port->break_timer);
|
||||
|
||||
sci_port->port.mapbase = p->mapbase;
|
||||
sci_port->port.membase = p->membase;
|
||||
port->mapbase = p->mapbase;
|
||||
port->membase = p->membase;
|
||||
|
||||
sci_port->port.irq = p->irqs[SCIx_TXI_IRQ];
|
||||
sci_port->port.flags = p->flags;
|
||||
sci_port->type = sci_port->port.type = p->type;
|
||||
port->irq = p->irqs[SCIx_TXI_IRQ];
|
||||
port->flags = p->flags;
|
||||
sci_port->type = port->type = p->type;
|
||||
|
||||
#ifdef CONFIG_SERIAL_SH_SCI_DMA
|
||||
sci_port->dma_dev = p->dma_dev;
|
||||
sci_port->slave_tx = p->dma_slave_tx;
|
||||
sci_port->slave_rx = p->dma_slave_rx;
|
||||
|
||||
dev_dbg(port->dev, "%s: DMA device %p, tx %d, rx %d\n", __func__,
|
||||
p->dma_dev, p->dma_slave_tx, p->dma_slave_rx);
|
||||
#endif
|
||||
|
||||
memcpy(&sci_port->irqs, &p->irqs, sizeof(p->irqs));
|
||||
}
|
||||
|
||||
@ -2,6 +2,7 @@
|
||||
#define __LINUX_SERIAL_SCI_H
|
||||
|
||||
#include <linux/serial_core.h>
|
||||
#include <asm/dmaengine.h>
|
||||
|
||||
/*
|
||||
* Generic header for SuperH SCI(F) (used by sh/sh64/h8300 and related parts)
|
||||
@ -16,6 +17,8 @@ enum {
|
||||
SCIx_NR_IRQS,
|
||||
};
|
||||
|
||||
struct device;
|
||||
|
||||
/*
|
||||
* Platform device specific platform_data struct
|
||||
*/
|
||||
@ -26,6 +29,9 @@ struct plat_sci_port {
|
||||
unsigned int type; /* SCI / SCIF / IRDA */
|
||||
upf_t flags; /* UPF_* flags */
|
||||
char *clk; /* clock string */
|
||||
struct device *dma_dev;
|
||||
enum sh_dmae_slave_chan_id dma_slave_tx;
|
||||
enum sh_dmae_slave_chan_id dma_slave_rx;
|
||||
};
|
||||
|
||||
#endif /* __LINUX_SERIAL_SCI_H */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user