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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: Chris Brandt <chris.brandt@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chris Brandt 2018-07-31 05:41:39 -05:00 committed by Greg Kroah-Hartman
parent 7acece71a5
commit 628c534ae7
1 changed files with 40 additions and 51 deletions
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91
drivers/tty/serial/sh-sci.c
View File

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