From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Chris Brandt Subject: [PATCH v2 4/4] serial: sh-sci: Improve support for separate TEI and DRI interrupts Date: Mon, 30 Jul 2018 08:17:16 -0500 Message-Id: <20180730131716.75484-5-chris.brandt@renesas.com> In-Reply-To: <20180730131716.75484-1-chris.brandt@renesas.com> References: <20180730131716.75484-1-chris.brandt@renesas.com> To: Greg Kroah-Hartman , Rob Herring , Mark Rutland , Geert Uytterhoeven Cc: linux-serial@vger.kernel.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Simon Horman , Chris Brandt List-ID: 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 Reviewed-by: Geert Uytterhoeven --- v2: * Removed - 1 from loop * Added Reviewed-by --- drivers/tty/serial/sh-sci.c | 90 ++++++++++++++++++++------------------------- 1 file changed, 40 insertions(+), 50 deletions(-) diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 54ea58bbe3c9..377b2c1b52b9 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -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; @@ -1845,31 +1858,8 @@ 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 +2832,17 @@ 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)) -- 2.16.1