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serial: sirf: add support for new SiRFmarco SMP SoC

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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>
This commit is contained in:
Barry Song 2012-12-25 17:32:04 +08:00 committed by Greg Kroah-Hartman
parent 92b336f6af
commit 5425e03f97
2 changed files with 20 additions and 1 deletions
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19
drivers/tty/serial/sirfsoc_uart.c
View file

@ -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);

2
drivers/tty/serial/sirfsoc_uart.h
View file

@ -139,7 +139,7 @@
#define SIRFSOC_UART_MINOR 0
#define SIRFUART_PORT_NAME "sirfsoc-uart"
#define SIRFUART_MAP_SIZE 0x200
#define SIRFSOC_UART_NR 3
#define SIRFSOC_UART_NR 5
#define SIRFSOC_PORT_TYPE 0xa5
/* Baud Rate Calculation */