Commit 628c534a authored by Chris Brandt's avatar Chris Brandt Committed by Greg Kroah-Hartman
Browse files

serial: sh-sci: Improve support for separate TEI and DRI interrupts 



Some SCIF versions mux error and break interrupts together and then provide
a separate interrupt ID for just TEI/DRI.

Allow all 6 types of interrupts to be specified via platform data (or DT)
and for any signals that are muxed together (have the same interrupt
number) simply register one handler.

Signed-off-by: default avatarChris Brandt <chris.brandt@renesas.com>
Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7acece71

drivers/tty/serial/sh-sci.c

+40 −51
Original line number Diff line number Diff line
@@ -65,7 +65,8 @@ enum { 
	SCIx_RXI_IRQ,

	SCIx_TXI_IRQ,

	SCIx_BRI_IRQ,

	SCIx_TEIDRI_IRQ,

	SCIx_DRI_IRQ,

	SCIx_TEI_IRQ,

	SCIx_NR_IRQS,



	SCIx_MUX_IRQ = SCIx_NR_IRQS,	/* special case */
@@ -77,9 +78,6 @@ enum { 
	((port)->irqs[SCIx_ERI_IRQ] &&	\

	 ((port)->irqs[SCIx_RXI_IRQ] < 0))



#define SCIx_TEIDRI_IRQ_EXISTS(port)		\

	((port)->irqs[SCIx_TEIDRI_IRQ] > 0)



enum SCI_CLKS {

	SCI_FCK,		/* Functional Clock */

	SCI_SCK,		/* Optional External Clock */
@@ -1685,14 +1683,23 @@ static irqreturn_t sci_tx_interrupt(int irq, void *ptr) 
	return IRQ_HANDLED;

}



static irqreturn_t sci_br_interrupt(int irq, void *ptr);

static irqreturn_t sci_br_interrupt(int irq, void *ptr)

{

	struct uart_port *port = ptr;



	/* Handle BREAKs */

	sci_handle_breaks(port);

	sci_clear_SCxSR(port, SCxSR_BREAK_CLEAR(port));



	return IRQ_HANDLED;

}



static irqreturn_t sci_er_interrupt(int irq, void *ptr)

{

	struct uart_port *port = ptr;

	struct sci_port *s = to_sci_port(port);



	if (SCIx_TEIDRI_IRQ_EXISTS(s)) {

	if (s->irqs[SCIx_ERI_IRQ] == s->irqs[SCIx_BRI_IRQ]) {

		/* Break and Error interrupts are muxed */

		unsigned short ssr_status = serial_port_in(port, SCxSR);
@@ -1727,17 +1734,6 @@ static irqreturn_t sci_er_interrupt(int irq, void *ptr) 
	return IRQ_HANDLED;

}



static irqreturn_t sci_br_interrupt(int irq, void *ptr)

{

	struct uart_port *port = ptr;



	/* Handle BREAKs */

	sci_handle_breaks(port);

	sci_clear_SCxSR(port, SCxSR_BREAK_CLEAR(port));



	return IRQ_HANDLED;

}



static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)

{

	unsigned short ssr_status, scr_status, err_enabled, orer_status = 0;
@@ -1811,6 +1807,16 @@ static const struct sci_irq_desc { 
		.handler = sci_br_interrupt,

	},



	[SCIx_DRI_IRQ] = {

		.desc = "rx ready",

		.handler = sci_rx_interrupt,

	},



	[SCIx_TEI_IRQ] = {

		.desc = "tx end",

		.handler = sci_tx_interrupt,

	},



	/*

	 * Special muxed handler.

	 */
@@ -1823,12 +1829,19 @@ static const struct sci_irq_desc { 
static int sci_request_irq(struct sci_port *port)

{

	struct uart_port *up = &port->port;

	int i, j, ret = 0;

	int i, j, w, ret = 0;



	for (i = j = 0; i < SCIx_NR_IRQS; i++, j++) {

		const struct sci_irq_desc *desc;

		int irq;



		/* Check if already registered (muxed) */

		for (w = 0; w < i; w++)

			if (port->irqs[w] == port->irqs[i])

				w = i + 1;

		if (w > i)

			continue;



		if (SCIx_IRQ_IS_MUXED(port)) {

			i = SCIx_MUX_IRQ;

			irq = up->irq;
@@ -1844,32 +1857,8 @@ static int sci_request_irq(struct sci_port *port) 
		}



		desc = sci_irq_desc + i;

		port->irqstr[j] = NULL;

		if (SCIx_TEIDRI_IRQ_EXISTS(port)) {

			/*

			 * ERI and BRI are muxed, just register ERI and

			 * ignore BRI.

			 * TEI and DRI are muxed, but only DRI

			 * is enabled, so use RXI handler

			 */

			if (i == SCIx_ERI_IRQ)

				port->irqstr[j] = kasprintf(GFP_KERNEL,

							    "%s:err + break",

							    dev_name(up->dev));

			if (i == SCIx_BRI_IRQ)

				continue;

			if (i == SCIx_TEIDRI_IRQ) {

				port->irqstr[j] = kasprintf(GFP_KERNEL,

							    "%s:tx end + rx ready",

							    dev_name(up->dev));

				desc = sci_irq_desc + SCIx_RXI_IRQ;

			}

		}



		if (!port->irqstr[j])

		port->irqstr[j] = kasprintf(GFP_KERNEL, "%s:%s",

						    dev_name(up->dev),

						    desc->desc);

					    dev_name(up->dev), desc->desc);

		if (!port->irqstr[j]) {

			ret = -ENOMEM;

			goto out_nomem;
@@ -2842,17 +2831,17 @@ static int sci_init_single(struct platform_device *dev, 


	/* 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.

	 * interrupt resource is specified as there is only one interrupt ID.

	 * In the non-muxed case, up to 6 interrupt signals might be generated

	 * from the SCI, however those signals might have their own individual

	 * interrupt ID numbers, or muxed together with another interrupt.

	 */

	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];

	}

	if (sci_port->irqs[1] < 0)

		for (i = 1; i < ARRAY_SIZE(sci_port->irqs); i++)

			sci_port->irqs[i] = sci_port->irqs[0];



	sci_port->params = sci_probe_regmap(p);

	if (unlikely(sci_port->params == NULL))

CRA Git | Maintained and supported by SUSTech CRA and CCSE