1 files changed, 63 insertions, 91 deletions

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 6ee59001d61d..61477567423f 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -99,12 +99,6 @@ struct sci_port {
 #endif
 
 	struct notifier_block		freq_transition;
-
-#ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
-	unsigned short saved_smr;
-	unsigned short saved_fcr;
-	unsigned char saved_brr;
-#endif
 };
 
 /* Function prototypes */
@@ -202,9 +196,9 @@ static struct plat_sci_reg sci_regmap[SCIx_NR_REGTYPES][SCIx_NR_REGS] = {
 		[SCxSR]		= { 0x14, 16 },
 		[SCxRDR]	= { 0x60,  8 },
 		[SCFCR]		= { 0x18, 16 },
-		[SCFDR]		= { 0x1c, 16 },
-		[SCTFDR]	= sci_reg_invalid,
-		[SCRFDR]	= sci_reg_invalid,
+		[SCFDR]		= sci_reg_invalid,
+		[SCTFDR]	= { 0x38, 16 },
+		[SCRFDR]	= { 0x3c, 16 },
 		[SCSPTR]	= sci_reg_invalid,
 		[SCLSR]		= sci_reg_invalid,
 	},
@@ -491,7 +485,7 @@ static int sci_txfill(struct uart_port *port)
 
 	reg = sci_getreg(port, SCTFDR);
 	if (reg->size)
-		return serial_port_in(port, SCTFDR) & 0xff;
+		return serial_port_in(port, SCTFDR) & ((port->fifosize << 1) - 1);
 
 	reg = sci_getreg(port, SCFDR);
 	if (reg->size)
@@ -511,7 +505,7 @@ static int sci_rxfill(struct uart_port *port)
 
 	reg = sci_getreg(port, SCRFDR);
 	if (reg->size)
-		return serial_port_in(port, SCRFDR) & 0xff;
+		return serial_port_in(port, SCRFDR) & ((port->fifosize << 1) - 1);
 
 	reg = sci_getreg(port, SCFDR);
 	if (reg->size)
@@ -1132,7 +1126,7 @@ static const char *sci_gpio_str(unsigned int index)
 	return sci_gpio_names[index];
 }
 
-static void __devinit sci_init_gpios(struct sci_port *port)
+static void sci_init_gpios(struct sci_port *port)
 {
 	struct uart_port *up = &port->port;
 	int i;
@@ -1749,22 +1743,21 @@ static inline void sci_free_dma(struct uart_port *port)
 static int sci_startup(struct uart_port *port)
 {
 	struct sci_port *s = to_sci_port(port);
+	unsigned long flags;
 	int ret;
 
 	dev_dbg(port->dev, "%s(%d)\n", __func__, port->line);
 
-	pm_runtime_put_noidle(port->dev);
-
-	sci_port_enable(s);
-
 	ret = sci_request_irq(s);
 	if (unlikely(ret < 0))
 		return ret;
 
 	sci_request_dma(port);
 
+	spin_lock_irqsave(&port->lock, flags);
 	sci_start_tx(port);
 	sci_start_rx(port);
+	spin_unlock_irqrestore(&port->lock, flags);
 
 	return 0;
 }
@@ -1772,18 +1765,17 @@ static int sci_startup(struct uart_port *port)
 static void sci_shutdown(struct uart_port *port)
 {
 	struct sci_port *s = to_sci_port(port);
+	unsigned long flags;
 
 	dev_dbg(port->dev, "%s(%d)\n", __func__, port->line);
 
+	spin_lock_irqsave(&port->lock, flags);
 	sci_stop_rx(port);
 	sci_stop_tx(port);
+	spin_unlock_irqrestore(&port->lock, flags);
 
 	sci_free_dma(port);
 	sci_free_irq(s);
-
-	sci_port_disable(s);
-
-	pm_runtime_get_noresume(port->dev);
 }
 
 static unsigned int sci_scbrr_calc(unsigned int algo_id, unsigned int bps,
@@ -1829,7 +1821,7 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
 {
 	struct sci_port *s = to_sci_port(port);
 	struct plat_sci_reg *reg;
-	unsigned int baud, smr_val, max_baud;
+	unsigned int baud, smr_val, max_baud, cks;
 	int t = -1;
 
 	/*
@@ -1863,21 +1855,18 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
 
 	uart_update_timeout(port, termios->c_cflag, baud);
 
-	serial_port_out(port, SCSMR, smr_val);
-
-	dev_dbg(port->dev, "%s: SMR %x, t %x, SCSCR %x\n", __func__, smr_val, t,
-		s->cfg->scscr);
+	for (cks = 0; t >= 256 && cks <= 3; cks++)
+		t >>= 2;
 
-	if (t > 0) {
-		if (t >= 256) {
-			serial_port_out(port, SCSMR, (serial_port_in(port, SCSMR) & ~3) | 1);
-			t >>= 2;
-		} else
-			serial_port_out(port, SCSMR, serial_port_in(port, SCSMR) & ~3);
+	dev_dbg(port->dev, "%s: SMR %x, cks %x, t %x, SCSCR %x\n",
+		__func__, smr_val, cks, t, s->cfg->scscr);
 
+	if (t >= 0) {
+		serial_port_out(port, SCSMR, (smr_val & ~3) | cks);
 		serial_port_out(port, SCBRR, t);
 		udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
-	}
+	} else
+		serial_port_out(port, SCSMR, smr_val);
 
 	sci_init_pins(port, termios->c_cflag);
 
@@ -1932,6 +1921,21 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
 	sci_port_disable(s);
 }
 
+static void sci_pm(struct uart_port *port, unsigned int state,
+		   unsigned int oldstate)
+{
+	struct sci_port *sci_port = to_sci_port(port);
+
+	switch (state) {
+	case 3:
+		sci_port_disable(sci_port);
+		break;
+	default:
+		sci_port_enable(sci_port);
+		break;
+	}
+}
+
 static const char *sci_type(struct uart_port *port)
 {
 	switch (port->type) {
@@ -2053,6 +2057,7 @@ static struct uart_ops sci_uart_ops = {
 	.startup	= sci_startup,
 	.shutdown	= sci_shutdown,
 	.set_termios	= sci_set_termios,
+	.pm		= sci_pm,
 	.type		= sci_type,
 	.release_port	= sci_release_port,
 	.request_port	= sci_request_port,
@@ -2064,7 +2069,7 @@ static struct uart_ops sci_uart_ops = {
 #endif
 };
 
-static int __devinit sci_init_single(struct platform_device *dev,
+static int sci_init_single(struct platform_device *dev,
 				     struct sci_port *sci_port,
 				     unsigned int index,
 				     struct plat_sci_port *p)
@@ -2121,8 +2126,6 @@ static int __devinit sci_init_single(struct platform_device *dev,
 
 		sci_init_gpios(sci_port);
 
-		pm_runtime_irq_safe(&dev->dev);
-		pm_runtime_get_noresume(&dev->dev);
 		pm_runtime_enable(&dev->dev);
 	}
 
@@ -2206,9 +2209,21 @@ static void serial_console_write(struct console *co, const char *s,
 {
 	struct sci_port *sci_port = &sci_ports[co->index];
 	struct uart_port *port = &sci_port->port;
-	unsigned short bits;
+	unsigned short bits, ctrl;
+	unsigned long flags;
+	int locked = 1;
+
+	local_irq_save(flags);
+	if (port->sysrq)
+		locked = 0;
+	else if (oops_in_progress)
+		locked = spin_trylock(&port->lock);
+	else
+		spin_lock(&port->lock);
 
-	sci_port_enable(sci_port);
+	/* first save the SCSCR then disable the interrupts */
+	ctrl = serial_port_in(port, SCSCR);
+	serial_port_out(port, SCSCR, sci_port->cfg->scscr);
 
 	uart_console_write(port, s, count, serial_console_putchar);
 
@@ -2217,10 +2232,15 @@ static void serial_console_write(struct console *co, const char *s,
 	while ((serial_port_in(port, SCxSR) & bits) != bits)
 		cpu_relax();
 
-	sci_port_disable(sci_port);
+	/* restore the SCSCR */
+	serial_port_out(port, SCSCR, ctrl);
+
+	if (locked)
+		spin_unlock(&port->lock);
+	local_irq_restore(flags);
 }
 
-static int __devinit serial_console_setup(struct console *co, char *options)
+static int serial_console_setup(struct console *co, char *options)
 {
 	struct sci_port *sci_port;
 	struct uart_port *port;
@@ -2249,13 +2269,9 @@ static int __devinit serial_console_setup(struct console *co, char *options)
 	if (unlikely(ret != 0))
 		return ret;
 
-	sci_port_enable(sci_port);
-
 	if (options)
 		uart_parse_options(options, &baud, &parity, &bits, &flow);
 
-	sci_port_disable(sci_port);
-
 	return uart_set_options(port, co, baud, parity, bits, flow);
 }
 
@@ -2278,7 +2294,7 @@ static struct console early_serial_console = {
 
 static char early_serial_buf[32];
 
-static int __devinit sci_probe_earlyprintk(struct platform_device *pdev)
+static int sci_probe_earlyprintk(struct platform_device *pdev)
 {
 	struct plat_sci_port *cfg = pdev->dev.platform_data;
 
@@ -2298,57 +2314,15 @@ static int __devinit sci_probe_earlyprintk(struct platform_device *pdev)
 	return 0;
 }
 
-#define uart_console(port)	((port)->cons->index == (port)->line)
-
-static int sci_runtime_suspend(struct device *dev)
-{
-	struct sci_port *sci_port = dev_get_drvdata(dev);
-	struct uart_port *port = &sci_port->port;
-
-	if (uart_console(port)) {
-		struct plat_sci_reg *reg;
-
-		sci_port->saved_smr = serial_port_in(port, SCSMR);
-		sci_port->saved_brr = serial_port_in(port, SCBRR);
-
-		reg = sci_getreg(port, SCFCR);
-		if (reg->size)
-			sci_port->saved_fcr = serial_port_in(port, SCFCR);
-		else
-			sci_port->saved_fcr = 0;
-	}
-	return 0;
-}
-
-static int sci_runtime_resume(struct device *dev)
-{
-	struct sci_port *sci_port = dev_get_drvdata(dev);
-	struct uart_port *port = &sci_port->port;
-
-	if (uart_console(port)) {
-		sci_reset(port);
-		serial_port_out(port, SCSMR, sci_port->saved_smr);
-		serial_port_out(port, SCBRR, sci_port->saved_brr);
-
-		if (sci_port->saved_fcr)
-			serial_port_out(port, SCFCR, sci_port->saved_fcr);
-
-		serial_port_out(port, SCSCR, sci_port->cfg->scscr);
-	}
-	return 0;
-}
-
 #define SCI_CONSOLE	(&serial_console)
 
 #else
-static inline int __devinit sci_probe_earlyprintk(struct platform_device *pdev)
+static inline int sci_probe_earlyprintk(struct platform_device *pdev)
 {
 	return -EINVAL;
 }
 
 #define SCI_CONSOLE	NULL
-#define sci_runtime_suspend	NULL
-#define sci_runtime_resume	NULL
 
 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
 
@@ -2379,7 +2353,7 @@ static int sci_remove(struct platform_device *dev)
 	return 0;
 }
 
-static int __devinit sci_probe_single(struct platform_device *dev,
+static int sci_probe_single(struct platform_device *dev,
 				      unsigned int index,
 				      struct plat_sci_port *p,
 				      struct sci_port *sciport)
@@ -2409,7 +2383,7 @@ static int __devinit sci_probe_single(struct platform_device *dev,
 	return 0;
 }
 
-static int __devinit sci_probe(struct platform_device *dev)
+static int sci_probe(struct platform_device *dev)
 {
 	struct plat_sci_port *p = dev->dev.platform_data;
 	struct sci_port *sp = &sci_ports[dev->id];
@@ -2466,8 +2440,6 @@ static int sci_resume(struct device *dev)
 }
 
 static const struct dev_pm_ops sci_dev_pm_ops = {
-	.runtime_suspend = sci_runtime_suspend,
-	.runtime_resume = sci_runtime_resume,
 	.suspend	= sci_suspend,
 	.resume		= sci_resume,
 };