1 files changed, 111 insertions, 14 deletions

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 90621c3312b..48e259a0167 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -251,9 +251,16 @@ static const struct serial8250_config uart_config[] = {
 		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
 		.flags		= UART_CAP_FIFO | UART_CAP_UUE,
 	},
+	[PORT_RM9000] = {
+		.name		= "RM9000",
+		.fifo_size	= 16,
+		.tx_loadsz	= 16,
+		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
+		.flags		= UART_CAP_FIFO,
+	},
 };
 
-#ifdef CONFIG_SERIAL_8250_AU1X00
+#if defined (CONFIG_SERIAL_8250_AU1X00)
 
 /* Au1x00 UART hardware has a weird register layout */
 static const u8 au_io_in_map[] = {
@@ -289,6 +296,44 @@ static inline int map_8250_out_reg(struct uart_8250_port *up, int offset)
 	return au_io_out_map[offset];
 }
 
+#elif defined (CONFIG_SERIAL_8250_RM9K)
+
+static const u8
+	regmap_in[8] = {
+		[UART_RX]	= 0x00,
+		[UART_IER]	= 0x0c,
+		[UART_IIR]	= 0x14,
+		[UART_LCR]	= 0x1c,
+		[UART_MCR]	= 0x20,
+		[UART_LSR]	= 0x24,
+		[UART_MSR]	= 0x28,
+		[UART_SCR]	= 0x2c
+	},
+	regmap_out[8] = {
+		[UART_TX] 	= 0x04,
+		[UART_IER]	= 0x0c,
+		[UART_FCR]	= 0x18,
+		[UART_LCR]	= 0x1c,
+		[UART_MCR]	= 0x20,
+		[UART_LSR]	= 0x24,
+		[UART_MSR]	= 0x28,
+		[UART_SCR]	= 0x2c
+	};
+
+static inline int map_8250_in_reg(struct uart_8250_port *up, int offset)
+{
+	if (up->port.iotype != UPIO_RM9000)
+		return offset;
+	return regmap_in[offset];
+}
+
+static inline int map_8250_out_reg(struct uart_8250_port *up, int offset)
+{
+	if (up->port.iotype != UPIO_RM9000)
+		return offset;
+	return regmap_out[offset];
+}
+
 #else
 
 /* sane hardware needs no mapping */
@@ -308,8 +353,10 @@ static unsigned int serial_in(struct uart_8250_port *up, int offset)
 		return inb(up->port.iobase + 1);
 
 	case UPIO_MEM:
+	case UPIO_DWAPB:
 		return readb(up->port.membase + offset);
 
+	case UPIO_RM9000:
 	case UPIO_MEM32:
 		return readl(up->port.membase + offset);
 
@@ -333,6 +380,8 @@ static unsigned int serial_in(struct uart_8250_port *up, int offset)
 static void
 serial_out(struct uart_8250_port *up, int offset, int value)
 {
+	/* Save the offset before it's remapped */
+	int save_offset = offset;
 	offset = map_8250_out_reg(up, offset) << up->port.regshift;
 
 	switch (up->port.iotype) {
@@ -345,6 +394,7 @@ serial_out(struct uart_8250_port *up, int offset, int value)
 		writeb(value, up->port.membase + offset);
 		break;
 
+	case UPIO_RM9000:
 	case UPIO_MEM32:
 		writel(value, up->port.membase + offset);
 		break;
@@ -359,6 +409,18 @@ serial_out(struct uart_8250_port *up, int offset, int value)
 			writeb(value, up->port.membase + offset);
 		break;
 
+	case UPIO_DWAPB:
+		/* Save the LCR value so it can be re-written when a
+		 * Busy Detect interrupt occurs. */
+		if (save_offset == UART_LCR)
+			up->lcr = value;
+		writeb(value, up->port.membase + offset);
+		/* Read the IER to ensure any interrupt is cleared before
+		 * returning from ISR. */
+		if (save_offset == UART_TX || save_offset == UART_IER)
+			value = serial_in(up, UART_IER);
+		break;
+
 	default:
 		outb(value, up->port.iobase + offset);
 	}
@@ -373,6 +435,7 @@ serial_out_sync(struct uart_8250_port *up, int offset, int value)
 #ifdef CONFIG_SERIAL_8250_AU1X00
 	case UPIO_AU:
 #endif
+	case UPIO_DWAPB:
 		serial_out(up, offset, value);
 		serial_in(up, UART_LCR);	/* safe, no side-effects */
 		break;
@@ -403,7 +466,7 @@ static inline void _serial_dl_write(struct uart_8250_port *up, int value)
 	serial_outp(up, UART_DLM, value >> 8 & 0xff);
 }
 
-#ifdef CONFIG_SERIAL_8250_AU1X00
+#if defined (CONFIG_SERIAL_8250_AU1X00)
 /* Au1x00 haven't got a standard divisor latch */
 static int serial_dl_read(struct uart_8250_port *up)
 {
@@ -420,6 +483,24 @@ static void serial_dl_write(struct uart_8250_port *up, int value)
 	else
 		_serial_dl_write(up, value);
 }
+#elif defined (CONFIG_SERIAL_8250_RM9K)
+static int serial_dl_read(struct uart_8250_port *up)
+{
+	return	(up->port.iotype == UPIO_RM9000) ?
+		(((__raw_readl(up->port.membase + 0x10) << 8) |
+		(__raw_readl(up->port.membase + 0x08) & 0xff)) & 0xffff) :
+		_serial_dl_read(up);
+}
+
+static void serial_dl_write(struct uart_8250_port *up, int value)
+{
+	if (up->port.iotype == UPIO_RM9000) {
+		__raw_writel(value, up->port.membase + 0x08);
+		__raw_writel(value >> 8, up->port.membase + 0x10);
+	} else {
+		_serial_dl_write(up, value);
+	}
+}
 #else
 #define serial_dl_read(up) _serial_dl_read(up)
 #define serial_dl_write(up, value) _serial_dl_write(up, value)
@@ -621,7 +702,7 @@ static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p)
  * its clones.  (We treat the broken original StarTech 16650 V1 as a
  * 16550, and why not?  Startech doesn't seem to even acknowledge its
  * existence.)
- * 
+ *
  * What evil have men's minds wrought...
  */
 static void autoconfig_has_efr(struct uart_8250_port *up)
@@ -674,7 +755,7 @@ static void autoconfig_has_efr(struct uart_8250_port *up)
 			up->bugs |= UART_BUG_QUOT;
 		return;
 	}
-	
+
 	/*
 	 * We check for a XR16C850 by setting DLL and DLM to 0, and then
 	 * reading back DLL and DLM.  The chip type depends on the DLM
@@ -817,7 +898,7 @@ static void autoconfig_16550a(struct uart_8250_port *up)
 			status1 &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */
 			status1 |= 0x10;  /* 1.625 divisor for baud_base --> 921600 */
 			serial_outp(up, 0x04, status1);
-			
+
 			serial_dl_write(up, quot);
 
 			serial_outp(up, UART_LCR, 0);
@@ -913,7 +994,6 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
 	 * be frobbing the chips IRQ enable register to see if it exists.
 	 */
 	spin_lock_irqsave(&up->port.lock, flags);
-//	save_flags(flags); cli();
 
 	up->capabilities = 0;
 	up->bugs = 0;
@@ -922,7 +1002,7 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
 		/*
 		 * Do a simple existence test first; if we fail this,
 		 * there's no point trying anything else.
-		 * 
+		 *
 		 * 0x80 is used as a nonsense port to prevent against
 		 * false positives due to ISA bus float.  The
 		 * assumption is that 0x80 is a non-existent port;
@@ -961,7 +1041,7 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
 	save_mcr = serial_in(up, UART_MCR);
 	save_lcr = serial_in(up, UART_LCR);
 
-	/* 
+	/*
 	 * Check to see if a UART is really there.  Certain broken
 	 * internal modems based on the Rockwell chipset fail this
 	 * test, because they apparently don't implement the loopback
@@ -1068,9 +1148,8 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
 	else
 		serial_outp(up, UART_IER, 0);
 
- out:	
+ out:
 	spin_unlock_irqrestore(&up->port.lock, flags);
-//	restore_flags(flags);
 	DEBUG_AUTOCONF("type=%s\n", uart_config[up->port.type].name);
 }
 
@@ -1094,7 +1173,7 @@ static void autoconfig_irq(struct uart_8250_port *up)
 	save_mcr = serial_inp(up, UART_MCR);
 	save_ier = serial_inp(up, UART_IER);
 	serial_outp(up, UART_MCR, UART_MCR_OUT1 | UART_MCR_OUT2);
-	
+
 	irqs = probe_irq_on();
 	serial_outp(up, UART_MCR, 0);
 	udelay (10);
@@ -1159,8 +1238,11 @@ static void serial8250_start_tx(struct uart_port *port)
 		if (up->bugs & UART_BUG_TXEN) {
 			unsigned char lsr, iir;
 			lsr = serial_in(up, UART_LSR);
-			iir = serial_in(up, UART_IIR);
-			if (lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT)
+			iir = serial_in(up, UART_IIR) & 0x0f;
+			if ((up->port.type == PORT_RM9000) ?
+				(lsr & UART_LSR_THRE &&
+				(iir == UART_IIR_NO_INT || iir == UART_IIR_THRI)) :
+				(lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT))
 				transmit_chars(up);
 		}
 	}
@@ -1389,6 +1471,19 @@ static irqreturn_t serial8250_interrupt(int irq, void *dev_id)
 			handled = 1;
 
 			end = NULL;
+		} else if (up->port.iotype == UPIO_DWAPB &&
+			  (iir & UART_IIR_BUSY) == UART_IIR_BUSY) {
+			/* The DesignWare APB UART has an Busy Detect (0x07)
+			 * interrupt meaning an LCR write attempt occured while the
+			 * UART was busy. The interrupt must be cleared by reading
+			 * the UART status register (USR) and the LCR re-written. */
+			unsigned int status;
+			status = *(volatile u32 *)up->port.private_data;
+			serial_out(up, UART_LCR, up->lcr);
+
+			handled = 1;
+
+			end = NULL;
 		} else if (end == NULL)
 			end = l;
 
@@ -1928,7 +2023,7 @@ serial8250_set_termios(struct uart_port *port, struct ktermios *termios,
 	/*
 	 * Ask the core to calculate the divisor for us.
 	 */
-	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
+	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 	quot = serial8250_get_divisor(port, baud);
 
 	/*
@@ -2090,6 +2185,7 @@ static int serial8250_request_std_resource(struct uart_8250_port *up)
 	case UPIO_TSI:
 	case UPIO_MEM32:
 	case UPIO_MEM:
+	case UPIO_DWAPB:
 		if (!up->port.mapbase)
 			break;
 
@@ -2127,6 +2223,7 @@ static void serial8250_release_std_resource(struct uart_8250_port *up)
 	case UPIO_TSI:
 	case UPIO_MEM32:
 	case UPIO_MEM:
+	case UPIO_DWAPB:
 		if (!up->port.mapbase)
 			break;