serial: sirf: add support for new SiRFmarco SMP SoC

CSR SiRFmarco's UART IP is same with SiRFprimaII except that
it has two more uart ports.
this patch makes the old driver support new SiRFmarco as well:
1. add .compatible = "sirf,marco-uart" to OF match table
2. add two ports in the port table
3. take spin_lock in isr to avoid the conflict of threads opening
uart on CPU1 and isr running on CPU0.
For 3, we did see some problems on SiRFmarco as SiRFmarco is a
SMP SoC but the old SiRFprimaII is UP.

Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c
index 5da5cb962769..142217cd01f4 100644
--- a/drivers/tty/serial/sirfsoc_uart.c
+++ b/drivers/tty/serial/sirfsoc_uart.c
@@ -75,6 +75,20 @@ static struct sirfsoc_uart_port sirfsoc_uart_ports[SIRFSOC_UART_NR] = {
 			.line		= 2,
 		},
 	},
+	[3] = {
+		.port = {
+			.iotype		= UPIO_MEM,
+			.flags		= UPF_BOOT_AUTOCONF,
+			.line		= 3,
+		},
+	},
+	[4] = {
+		.port = {
+			.iotype		= UPIO_MEM,
+			.flags		= UPF_BOOT_AUTOCONF,
+			.line		= 4,
+		},
+	},
 };
 
 static inline struct sirfsoc_uart_port *to_sirfport(struct uart_port *port)
@@ -245,6 +259,7 @@ static irqreturn_t sirfsoc_uart_isr(int irq, void *dev_id)
 	struct uart_port *port = &sirfport->port;
 	struct uart_state *state = port->state;
 	struct circ_buf *xmit = &port->state->xmit;
+	spin_lock(&port->lock);
 	intr_status = rd_regl(port, SIRFUART_INT_STATUS);
 	wr_regl(port, SIRFUART_INT_STATUS, intr_status);
 	intr_status &= rd_regl(port, SIRFUART_INT_EN);
@@ -254,6 +269,7 @@ static irqreturn_t sirfsoc_uart_isr(int irq, void *dev_id)
 				goto recv_char;
 			uart_insert_char(port, intr_status,
 					SIRFUART_RX_OFLOW, 0, TTY_BREAK);
+			spin_unlock(&port->lock);
 			return IRQ_HANDLED;
 		}
 		if (intr_status & SIRFUART_RX_OFLOW)
@@ -286,6 +302,7 @@ recv_char:
 		sirfsoc_uart_pio_rx_chars(port, SIRFSOC_UART_IO_RX_MAX_CNT);
 	if (intr_status & SIRFUART_TX_INT_EN) {
 		if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+			spin_unlock(&port->lock);
 			return IRQ_HANDLED;
 		} else {
 			sirfsoc_uart_pio_tx_chars(sirfport,
@@ -296,6 +313,7 @@ recv_char:
 				sirfsoc_uart_stop_tx(port);
 		}
 	}
+	spin_unlock(&port->lock);
 	return IRQ_HANDLED;
 }
 
@@ -729,6 +747,7 @@ static int sirfsoc_uart_resume(struct platform_device *pdev)
 
 static struct of_device_id sirfsoc_uart_ids[] = {
 	{ .compatible = "sirf,prima2-uart", },
+	{ .compatible = "sirf,marco-uart", },
 	{}
 };
 MODULE_DEVICE_TABLE(of, sirfsoc_serial_of_match);