Merge branch 'renesas/drivers-sci2' into next/drivers (6878e0c0) · Commits · 戴 / test

drivers/tty/serial/sh-sci.c

+153 −167

Original line number	Diff line number	Diff line
		@@ -23,35 +23,34 @@

		#undef DEBUG

		#include <linux/module.h>
		#include <linux/clk.h>
		#include <linux/console.h>
		#include <linux/ctype.h>
		#include <linux/cpufreq.h>
		#include <linux/delay.h>
		#include <linux/dmaengine.h>
		#include <linux/dma-mapping.h>
		#include <linux/err.h>
		#include <linux/errno.h>
		#include <linux/sh_dma.h>
		#include <linux/timer.h>
		#include <linux/init.h>
		#include <linux/interrupt.h>
		#include <linux/tty.h>
		#include <linux/tty_flip.h>
		#include <linux/serial.h>
		#include <linux/major.h>
		#include <linux/string.h>
		#include <linux/sysrq.h>
		#include <linux/ioport.h>
		#include <linux/major.h>
		#include <linux/module.h>
		#include <linux/mm.h>
		#include <linux/init.h>
		#include <linux/delay.h>
		#include <linux/console.h>
		#include <linux/platform_device.h>
		#include <linux/serial_sci.h>
		#include <linux/notifier.h>
		#include <linux/platform_device.h>
		#include <linux/pm_runtime.h>
		#include <linux/cpufreq.h>
		#include <linux/clk.h>
		#include <linux/ctype.h>
		#include <linux/err.h>
		#include <linux/dmaengine.h>
		#include <linux/dma-mapping.h>
		#include <linux/scatterlist.h>
		#include <linux/serial.h>
		#include <linux/serial_sci.h>
		#include <linux/sh_dma.h>
		#include <linux/slab.h>
		#include <linux/gpio.h>
		#include <linux/string.h>
		#include <linux/sysrq.h>
		#include <linux/timer.h>
		#include <linux/tty.h>
		#include <linux/tty_flip.h>

		#ifdef CONFIG_SUPERH
		#include <asm/sh_bios.h>
		@@ -64,6 +63,10 @@ struct sci_port {

		/* Platform configuration */
		struct plat_sci_port *cfg;
		int overrun_bit;
		unsigned int error_mask;
		unsigned int sampling_rate;


		/* Break timer */
		struct timer_list break_timer;
		@@ -74,8 +77,8 @@ struct sci_port {
		/* Function clock */
		struct clk *fclk;

		int irqs[SCIx_NR_IRQS];
		char *irqstr[SCIx_NR_IRQS];
		char *gpiostr[SCIx_NR_FNS];

		struct dma_chan *chan_tx;
		struct dma_chan *chan_rx;
		@@ -421,9 +424,9 @@ static void sci_port_enable(struct sci_port *sci_port)

		pm_runtime_get_sync(sci_port->port.dev);

		clk_enable(sci_port->iclk);
		clk_prepare_enable(sci_port->iclk);
		sci_port->port.uartclk = clk_get_rate(sci_port->iclk);
		clk_enable(sci_port->fclk);
		clk_prepare_enable(sci_port->fclk);
		}

		static void sci_port_disable(struct sci_port *sci_port)
		@@ -431,8 +434,16 @@ static void sci_port_disable(struct sci_port *sci_port)
		if (!sci_port->port.dev)
		return;

		clk_disable(sci_port->fclk);
		clk_disable(sci_port->iclk);
		/* Cancel the break timer to ensure that the timer handler will not try
		* to access the hardware with clocks and power disabled. Reset the
		* break flag to make the break debouncing state machine ready for the
		* next break.
		*/
		del_timer_sync(&sci_port->break_timer);
		sci_port->break_flag = 0;

		clk_disable_unprepare(sci_port->fclk);
		clk_disable_unprepare(sci_port->iclk);

		pm_runtime_put_sync(sci_port->port.dev);
		}
		@@ -557,7 +568,7 @@ static inline int sci_rxd_in(struct uart_port *port)
		return 1;

		/* Cast for ARM damage */
		return !!__raw_readb((void __iomem *)s->cfg->port_reg);
		return !!__raw_readb((void __iomem *)(uintptr_t)s->cfg->port_reg);
		}

		/* ********************************************************************** *
		@@ -733,8 +744,6 @@ static void sci_break_timer(unsigned long data)
		{
		struct sci_port port = (struct sci_port )data;

		sci_port_enable(port);

		if (sci_rxd_in(&port->port) == 0) {
		port->break_flag = 1;
		sci_schedule_break_timer(port);
		@@ -744,8 +753,6 @@ static void sci_break_timer(unsigned long data)
		sci_schedule_break_timer(port);
		} else
		port->break_flag = 0;

		sci_port_disable(port);
		}

		static int sci_handle_errors(struct uart_port *port)
		@@ -755,11 +762,8 @@ static int sci_handle_errors(struct uart_port *port)
		struct tty_port *tport = &port->state->port;
		struct sci_port *s = to_sci_port(port);

		/*
		* Handle overruns, if supported.
		*/
		if (s->cfg->overrun_bit != SCIx_NOT_SUPPORTED) {
		if (status & (1 << s->cfg->overrun_bit)) {
		/* Handle overruns */
		if (status & (1 << s->overrun_bit)) {
		port->icount.overrun++;

		/* overrun error */
		@@ -768,7 +772,6 @@ static int sci_handle_errors(struct uart_port *port)

		dev_notice(port->dev, "overrun error");
		}
		}

		if (status & SCxSR_FER(port)) {
		if (sci_rxd_in(port) == 0) {
		@@ -829,7 +832,7 @@ static int sci_handle_fifo_overrun(struct uart_port *port)
		if (!reg->size)
		return 0;

		if ((serial_port_in(port, SCLSR) & (1 << s->cfg->overrun_bit))) {
		if ((serial_port_in(port, SCLSR) & (1 << s->overrun_bit))) {
		serial_port_out(port, SCLSR, 0);

		port->icount.overrun++;
		@@ -1075,19 +1078,19 @@ static int sci_request_irq(struct sci_port *port)

		for (i = j = 0; i < SCIx_NR_IRQS; i++, j++) {
		struct sci_irq_desc *desc;
		unsigned int irq;
		int irq;

		if (SCIx_IRQ_IS_MUXED(port)) {
		i = SCIx_MUX_IRQ;
		irq = up->irq;
		} else {
		irq = port->cfg->irqs[i];
		irq = port->irqs[i];

		/*
		* Certain port types won't support all of the
		* available interrupt sources.
		*/
		if (unlikely(!irq))
		if (unlikely(irq < 0))
		continue;
		}

		@@ -1112,7 +1115,7 @@ static int sci_request_irq(struct sci_port *port)

		out_noirq:
		while (--i >= 0)
		free_irq(port->cfg->irqs[i], port);
		free_irq(port->irqs[i], port);

		out_nomem:
		while (--j >= 0)
		@@ -1130,16 +1133,16 @@ static void sci_free_irq(struct sci_port *port)
		* IRQ first.
		*/
		for (i = 0; i < SCIx_NR_IRQS; i++) {
		unsigned int irq = port->cfg->irqs[i];
		int irq = port->irqs[i];

		/*
		* Certain port types won't support all of the available
		* interrupt sources.
		*/
		if (unlikely(!irq))
		if (unlikely(irq < 0))
		continue;

		free_irq(port->cfg->irqs[i], port);
		free_irq(port->irqs[i], port);
		kfree(port->irqstr[i]);

		if (SCIx_IRQ_IS_MUXED(port)) {
		@@ -1149,67 +1152,6 @@ static void sci_free_irq(struct sci_port *port)
		}
		}

		static const char *sci_gpio_names[SCIx_NR_FNS] = {
		"sck", "rxd", "txd", "cts", "rts",
		};

		static const char *sci_gpio_str(unsigned int index)
		{
		return sci_gpio_names[index];
		}

		static void sci_init_gpios(struct sci_port *port)
		{
		struct uart_port *up = &port->port;
		int i;

		if (!port->cfg)
		return;

		for (i = 0; i < SCIx_NR_FNS; i++) {
		const char *desc;
		int ret;

		if (!port->cfg->gpios[i])
		continue;

		desc = sci_gpio_str(i);

		port->gpiostr[i] = kasprintf(GFP_KERNEL, "%s:%s",
		dev_name(up->dev), desc);

		/*
		* If we've failed the allocation, we can still continue
		* on with a NULL string.
		*/
		if (!port->gpiostr[i])
		dev_notice(up->dev, "%s string allocation failure\n",
		desc);

		ret = gpio_request(port->cfg->gpios[i], port->gpiostr[i]);
		if (unlikely(ret != 0)) {
		dev_notice(up->dev, "failed %s gpio request\n", desc);

		/*
		* If we can't get the GPIO for whatever reason,
		* no point in keeping the verbose string around.
		*/
		kfree(port->gpiostr[i]);
		}
		}
		}

		static void sci_free_gpios(struct sci_port *port)
		{
		int i;

		for (i = 0; i < SCIx_NR_FNS; i++)
		if (port->cfg->gpios[i]) {
		gpio_free(port->cfg->gpios[i]);
		kfree(port->gpiostr[i]);
		}
		}

		static unsigned int sci_tx_empty(struct uart_port *port)
		{
		unsigned short status = serial_port_in(port, SCxSR);
		@@ -1309,7 +1251,7 @@ static int sci_dma_rx_push(struct sci_port *s, size_t count)
		}

		if (room < count)
		dev_warn(port->dev, "Rx overrun: dropping %u bytes\n",
		dev_warn(port->dev, "Rx overrun: dropping %zu bytes\n",
		count - room);
		if (!room)
		return room;
		@@ -1442,7 +1384,7 @@ static void work_fn_rx(struct work_struct *work)
		int count;

		chan->device->device_control(chan, DMA_TERMINATE_ALL, 0);
		dev_dbg(port->dev, "Read %u bytes with cookie %d\n",
		dev_dbg(port->dev, "Read %zu bytes with cookie %d\n",
		sh_desc->partial, sh_desc->cookie);

		spin_lock_irqsave(&port->lock, flags);
		@@ -1655,7 +1597,7 @@ static void rx_timer_fn(unsigned long arg)

		if (port->type == PORT_SCIFA \|\| port->type == PORT_SCIFB) {
		scr &= ~0x4000;
		enable_irq(s->cfg->irqs[1]);
		enable_irq(s->irqs[SCIx_RXI_IRQ]);
		}
		serial_port_out(port, SCSCR, scr \| SCSCR_RIE);
		dev_dbg(port->dev, "DMA Rx timed out\n");
		@@ -1691,16 +1633,17 @@ static void sci_request_dma(struct uart_port *port)
		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);
		BUG_ON((uintptr_t)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);
		UART_XMIT_SIZE,
		(uintptr_t)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));
		dev_dbg(port->dev, "%s: mapped %d@%p to %pad\n", __func__,
		sg_dma_len(&s->sg_tx), port->state->xmit.buf,
		&sg_dma_address(&s->sg_tx));

		s->sg_len_tx = nent;

		@@ -1740,7 +1683,7 @@ static void sci_request_dma(struct uart_port *port)

		sg_init_table(sg, 1);
		sg_set_page(sg, virt_to_page(buf[i]), s->buf_len_rx,
		(int)buf[i] & ~PAGE_MASK);
		(uintptr_t)buf[i] & ~PAGE_MASK);
		sg_dma_address(sg) = dma[i];
		}

		@@ -1808,20 +1751,21 @@ static void sci_shutdown(struct uart_port *port)
		sci_free_irq(s);
		}

		static unsigned int sci_scbrr_calc(unsigned int algo_id, unsigned int bps,
		static unsigned int sci_scbrr_calc(struct sci_port *s, unsigned int bps,
		unsigned long freq)
		{
		switch (algo_id) {
		if (s->sampling_rate)
		return DIV_ROUND_CLOSEST(freq, s->sampling_rate * bps) - 1;

		switch (s->cfg->scbrr_algo_id) {
		case SCBRR_ALGO_1:
		return ((freq + 16 * bps) / (16 * bps) - 1);
		return freq / (16 * bps);
		case SCBRR_ALGO_2:
		return ((freq + 16 * bps) / (32 * bps) - 1);
		return DIV_ROUND_CLOSEST(freq, 32 * bps) - 1;
		case SCBRR_ALGO_3:
		return (((freq * 2) + 16 * bps) / (16 * bps) - 1);
		return freq / (8 * bps);
		case SCBRR_ALGO_4:
		return (((freq * 2) + 16 * bps) / (32 * bps) - 1);
		case SCBRR_ALGO_5:
		return (((freq * 1000 / 32) / bps) - 1);
		return DIV_ROUND_CLOSEST(freq, 16 * bps) - 1;
		}

		/* Warn, but use a safe default */
		@@ -1903,12 +1847,11 @@ static void sci_set_termios(struct uart_port port, struct ktermios termios,

		baud = uart_get_baud_rate(port, termios, old, 0, max_baud);
		if (likely(baud && port->uartclk)) {
		if (s->cfg->scbrr_algo_id == SCBRR_ALGO_6) {
		if (s->cfg->type == PORT_HSCIF) {
		sci_baud_calc_hscif(baud, port->uartclk, &t, &srr,
		&cks);
		} else {
		t = sci_scbrr_calc(s->cfg->scbrr_algo_id, baud,
		port->uartclk);
		t = sci_scbrr_calc(s, baud, port->uartclk);
		for (cks = 0; t >= 256 && cks <= 3; cks++)
		t >>= 2;
		}
		@@ -2115,10 +2058,6 @@ static void sci_config_port(struct uart_port *port, int flags)

		static int sci_verify_port(struct uart_port port, struct serial_struct ser)
		{
		struct sci_port *s = to_sci_port(port);

		if (ser->irq != s->cfg->irqs[SCIx_TXI_IRQ] \|\| ser->irq > nr_irqs)
		return -EINVAL;
		if (ser->baud_base < 2400)
		/* No paper tape reader for Mitch.. */
		return -EINVAL;
		@@ -2151,11 +2090,13 @@ static struct uart_ops sci_uart_ops = {
		};

		static int sci_init_single(struct platform_device *dev,
		struct sci_port *sci_port,
		unsigned int index,
		struct plat_sci_port *p)
		struct sci_port *sci_port, unsigned int index,
		struct plat_sci_port *p, bool early)
		{
		struct uart_port *port = &sci_port->port;
		const struct resource *res;
		unsigned int sampling_rate;
		unsigned int i;
		int ret;

		sci_port->cfg = p;
		@@ -2164,31 +2105,90 @@ static int sci_init_single(struct platform_device *dev,
		port->iotype = UPIO_MEM;
		port->line = index;

		if (dev->num_resources) {
		/* Device has resources, use them. */
		res = platform_get_resource(dev, IORESOURCE_MEM, 0);
		if (res == NULL)
		return -ENOMEM;

		port->mapbase = res->start;

		for (i = 0; i < ARRAY_SIZE(sci_port->irqs); ++i)
		sci_port->irqs[i] = platform_get_irq(dev, i);

		/* The SCI generates several interrupts. They can be muxed
		* together or connected to different interrupt lines. In the
		* muxed case only one interrupt resource is specified. In the
		* non-muxed case three or four interrupt resources are
		* specified, as the BRI interrupt is optional.
		*/
		if (sci_port->irqs[0] < 0)
		return -ENXIO;

		if (sci_port->irqs[1] < 0) {
		sci_port->irqs[1] = sci_port->irqs[0];
		sci_port->irqs[2] = sci_port->irqs[0];
		sci_port->irqs[3] = sci_port->irqs[0];
		}
		} else {
		/* No resources, use old-style platform data. */
		port->mapbase = p->mapbase;
		for (i = 0; i < ARRAY_SIZE(sci_port->irqs); ++i)
		sci_port->irqs[i] = p->irqs[i] ? p->irqs[i] : -ENXIO;
		}

		if (p->regtype == SCIx_PROBE_REGTYPE) {
		ret = sci_probe_regmap(p);
		if (unlikely(ret))
		return ret;
		}

		switch (p->type) {
		case PORT_SCIFB:
		port->fifosize = 256;
		sci_port->overrun_bit = 9;
		sampling_rate = 16;
		break;
		case PORT_HSCIF:
		port->fifosize = 128;
		sampling_rate = 0;
		sci_port->overrun_bit = 0;
		break;
		case PORT_SCIFA:
		port->fifosize = 64;
		sci_port->overrun_bit = 9;
		sampling_rate = 16;
		break;
		case PORT_SCIF:
		port->fifosize = 16;
		if (p->regtype == SCIx_SH7705_SCIF_REGTYPE) {
		sci_port->overrun_bit = 9;
		sampling_rate = 16;
		} else {
		sci_port->overrun_bit = 0;
		sampling_rate = 32;
		}
		break;
		default:
		port->fifosize = 1;
		sci_port->overrun_bit = 5;
		sampling_rate = 32;
		break;
		}

		if (p->regtype == SCIx_PROBE_REGTYPE) {
		ret = sci_probe_regmap(p);
		if (unlikely(ret))
		return ret;
		/* Set the sampling rate if the baud rate calculation algorithm isn't
		* specified.
		*/
		if (p->scbrr_algo_id == SCBRR_ALGO_NONE) {
		/* SCIFA on sh7723 and sh7724 need a custom sampling rate that
		* doesn't match the SoC datasheet, this should be investigated.
		* Let platform data override the sampling rate for now.
		*/
		sci_port->sampling_rate = p->sampling_rate ? p->sampling_rate
		: sampling_rate;
		}

		if (dev) {
		if (!early) {
		sci_port->iclk = clk_get(&dev->dev, "sci_ick");
		if (IS_ERR(sci_port->iclk)) {
		sci_port->iclk = clk_get(&dev->dev, "peripheral_clk");
		@@ -2208,8 +2208,6 @@ static int sci_init_single(struct platform_device *dev,

		port->dev = &dev->dev;

		sci_init_gpios(sci_port);

		pm_runtime_enable(&dev->dev);
		}

		@@ -2220,32 +2218,22 @@ static int sci_init_single(struct platform_device *dev,
		/*
		* Establish some sensible defaults for the error detection.
		*/
		if (!p->error_mask)
		p->error_mask = (p->type == PORT_SCI) ?
		sci_port->error_mask = (p->type == PORT_SCI) ?
		SCI_DEFAULT_ERROR_MASK : SCIF_DEFAULT_ERROR_MASK;

		/*
		* Establish sensible defaults for the overrun detection, unless
		* the part has explicitly disabled support for it.
		*/
		if (p->overrun_bit != SCIx_NOT_SUPPORTED) {
		if (p->type == PORT_SCI)
		p->overrun_bit = 5;
		else if (p->scbrr_algo_id == SCBRR_ALGO_4)
		p->overrun_bit = 9;
		else
		p->overrun_bit = 0;

		/*
		* Make the error mask inclusive of overrun detection, if
		* supported.
		*/
		p->error_mask \|= (1 << p->overrun_bit);
		}
		sci_port->error_mask \|= 1 << sci_port->overrun_bit;

		port->mapbase = p->mapbase;
		port->type = p->type;
		port->flags = p->flags;
		port->flags = UPF_FIXED_PORT \| p->flags;
		port->regshift = p->regshift;

		/*
		@@ -2255,7 +2243,7 @@ static int sci_init_single(struct platform_device *dev,
		*
		* For the muxed case there's nothing more to do.
		*/
		port->irq = p->irqs[SCIx_RXI_IRQ];
		port->irq = sci_port->irqs[SCIx_RXI_IRQ];
		port->irqflags = 0;

		port->serial_in = sci_serial_in;
		@@ -2270,8 +2258,6 @@ static int sci_init_single(struct platform_device *dev,

		static void sci_cleanup_single(struct sci_port *port)
		{
		sci_free_gpios(port);

		clk_put(port->iclk);
		clk_put(port->fclk);

		@@ -2387,7 +2373,7 @@ static int sci_probe_earlyprintk(struct platform_device *pdev)

		early_serial_console.index = pdev->id;

		sci_init_single(NULL, &sci_ports[pdev->id], pdev->id, cfg);
		sci_init_single(pdev, &sci_ports[pdev->id], pdev->id, cfg, true);

		serial_console_setup(&early_serial_console, early_serial_buf);

		@@ -2454,7 +2440,7 @@ static int sci_probe_single(struct platform_device *dev,
		return -EINVAL;
		}

		ret = sci_init_single(dev, sciport, index, p);
		ret = sci_init_single(dev, sciport, index, p, false);
		if (ret)
		return ret;

drivers/tty/serial/sh-sci.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -9,7 +9,7 @@
		#define SCxSR_PER(port) (((port)->type == PORT_SCI) ? SCI_PER : SCIF_PER)
		#define SCxSR_BRK(port) (((port)->type == PORT_SCI) ? 0x00 : SCIF_BRK)

		#define SCxSR_ERRORS(port) (to_sci_port(port)->cfg->error_mask)
		#define SCxSR_ERRORS(port) (to_sci_port(port)->error_mask)

		#if defined(CONFIG_CPU_SUBTYPE_SH7705) \|\| \
		defined(CONFIG_CPU_SUBTYPE_SH7720) \|\| \

include/linux/serial_sci.h

+10 −24

Original line number	Diff line number	Diff line
		@@ -11,11 +11,11 @@
		#define SCIx_NOT_SUPPORTED (-1)

		enum {
		SCBRR_ALGO_1, /* ((clk + 16 * bps) / (16 * bps) - 1) */
		SCBRR_ALGO_2, /* ((clk + 16 * bps) / (32 * bps) - 1) */
		SCBRR_ALGO_3, /* (((clk * 2) + 16 * bps) / (16 * bps) - 1) */
		SCBRR_ALGO_4, /* (((clk * 2) + 16 * bps) / (32 * bps) - 1) */
		SCBRR_ALGO_5, /* (((clk * 1000 / 32) / bps) - 1) */
		SCBRR_ALGO_NONE, /* Compute sampling rate in the driver */
		SCBRR_ALGO_1, /* clk / (16 * bps) */
		SCBRR_ALGO_2, /* DIV_ROUND_CLOSEST(clk, 32 * bps) - 1 */
		SCBRR_ALGO_3, /* clk / (8 * bps) */
		SCBRR_ALGO_4, /* DIV_ROUND_CLOSEST(clk, 16 * bps) - 1 */
		SCBRR_ALGO_6, /* HSCIF variable sample rate algorithm */
		};

		@@ -70,17 +70,6 @@ enum {
		SCIx_MUX_IRQ = SCIx_NR_IRQS, /* special case */
		};

		/* Offsets into the sci_port->gpios array */
		enum {
		SCIx_SCK,
		SCIx_RXD,
		SCIx_TXD,
		SCIx_CTS,
		SCIx_RTS,

		SCIx_NR_FNS,
		};

		enum {
		SCIx_PROBE_REGTYPE,

		@@ -108,10 +97,10 @@ enum {
		}

		#define SCIx_IRQ_IS_MUXED(port) \
		((port)->cfg->irqs[SCIx_ERI_IRQ] == \
		(port)->cfg->irqs[SCIx_RXI_IRQ]) \|\| \
		((port)->cfg->irqs[SCIx_ERI_IRQ] && \
		!(port)->cfg->irqs[SCIx_RXI_IRQ])
		((port)->irqs[SCIx_ERI_IRQ] == \
		(port)->irqs[SCIx_RXI_IRQ]) \|\| \
		((port)->irqs[SCIx_ERI_IRQ] && \
		((port)->irqs[SCIx_RXI_IRQ] < 0))
		/*
		* SCI register subset common for all port types.
		* Not all registers will exist on all parts.
		@@ -142,20 +131,17 @@ struct plat_sci_port_ops {
		struct plat_sci_port {
		unsigned long mapbase; /* resource base */
		unsigned int irqs[SCIx_NR_IRQS]; /* ERI, RXI, TXI, BRI */
		unsigned int gpios[SCIx_NR_FNS]; /* SCK, RXD, TXD, CTS, RTS */
		unsigned int type; /* SCI / SCIF / IRDA / HSCIF */
		upf_t flags; /* UPF_* flags */
		unsigned long capabilities; /* Port features/capabilities */

		unsigned int sampling_rate;
		unsigned int scbrr_algo_id; /* SCBRR calculation algo */
		unsigned int scscr; /* SCSCR initialization */

		/*
		* Platform overrides if necessary, defaults otherwise.
		*/
		int overrun_bit;
		unsigned int error_mask;

		int port_reg;
		unsigned char regshift;
		unsigned char regtype;

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