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-rw-r--r--drivers/tty/serial/vt8500_serial.c70
1 files changed, 56 insertions, 14 deletions
diff --git a/drivers/tty/serial/vt8500_serial.c b/drivers/tty/serial/vt8500_serial.c
index 15ad6fcda88b..f22571915185 100644
--- a/drivers/tty/serial/vt8500_serial.c
+++ b/drivers/tty/serial/vt8500_serial.c
@@ -33,8 +33,8 @@
#include <linux/serial.h>
#include <linux/slab.h>
#include <linux/clk.h>
-#include <linux/platform_device.h>
#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/err.h>
/*
@@ -78,6 +78,29 @@
#define RX_FIFO_INTS (RXFAF | RXFF | RXOVER | PER | FER | RXTOUT)
#define TX_FIFO_INTS (TXFAE | TXFE | TXUDR)
+/*
+ * Line control bits
+ */
+
+#define VT8500_TXEN (1 << 0) /* Enable transmit logic */
+#define VT8500_RXEN (1 << 1) /* Enable receive logic */
+#define VT8500_CS8 (1 << 2) /* 8-bit data length (vs. 7-bit) */
+#define VT8500_CSTOPB (1 << 3) /* 2 stop bits (vs. 1) */
+#define VT8500_PARENB (1 << 4) /* Enable parity */
+#define VT8500_PARODD (1 << 5) /* Odd parity (vs. even) */
+#define VT8500_RTS (1 << 6) /* Ready to send */
+#define VT8500_LOOPBK (1 << 7) /* Enable internal loopback */
+#define VT8500_DMA (1 << 8) /* Enable DMA mode (needs FIFO) */
+#define VT8500_BREAK (1 << 9) /* Initiate break signal */
+#define VT8500_PSLVERR (1 << 10) /* APB error upon empty RX FIFO read */
+#define VT8500_SWRTSCTS (1 << 11) /* Software-controlled RTS/CTS */
+
+/*
+ * Capability flags (driver-internal)
+ */
+
+#define VT8500_HAS_SWRTSCTS_SWITCH (1 << 1)
+
#define VT8500_MAX_PORTS 6
struct vt8500_port {
@@ -85,6 +108,7 @@ struct vt8500_port {
char name[16];
struct clk *clk;
unsigned int ier;
+ unsigned int vt8500_uart_flags;
};
/*
@@ -272,7 +296,8 @@ static void vt8500_set_mctrl(struct uart_port *port, unsigned int mctrl)
static void vt8500_break_ctl(struct uart_port *port, int break_ctl)
{
if (break_ctl)
- vt8500_write(port, vt8500_read(port, VT8500_URLCR) | (1 << 9),
+ vt8500_write(port,
+ vt8500_read(port, VT8500_URLCR) | VT8500_BREAK,
VT8500_URLCR);
}
@@ -347,31 +372,35 @@ static void vt8500_set_termios(struct uart_port *port,
/* calculate parity */
lcr = vt8500_read(&vt8500_port->uart, VT8500_URLCR);
- lcr &= ~((1 << 5) | (1 << 4));
+ lcr &= ~(VT8500_PARENB | VT8500_PARODD);
if (termios->c_cflag & PARENB) {
- lcr |= (1 << 4);
+ lcr |= VT8500_PARENB;
termios->c_cflag &= ~CMSPAR;
if (termios->c_cflag & PARODD)
- lcr |= (1 << 5);
+ lcr |= VT8500_PARODD;
}
/* calculate bits per char */
- lcr &= ~(1 << 2);
+ lcr &= ~VT8500_CS8;
switch (termios->c_cflag & CSIZE) {
case CS7:
break;
case CS8:
default:
- lcr |= (1 << 2);
+ lcr |= VT8500_CS8;
termios->c_cflag &= ~CSIZE;
termios->c_cflag |= CS8;
break;
}
/* calculate stop bits */
- lcr &= ~(1 << 3);
+ lcr &= ~VT8500_CSTOPB;
if (termios->c_cflag & CSTOPB)
- lcr |= (1 << 3);
+ lcr |= VT8500_CSTOPB;
+
+ lcr &= ~VT8500_SWRTSCTS;
+ if (vt8500_port->vt8500_uart_flags & VT8500_HAS_SWRTSCTS_SWITCH)
+ lcr |= VT8500_SWRTSCTS;
/* set parity, bits per char, and stop bit */
vt8500_write(&vt8500_port->uart, lcr, VT8500_URLCR);
@@ -548,14 +577,31 @@ static struct uart_driver vt8500_uart_driver = {
.cons = VT8500_CONSOLE,
};
+static unsigned int vt8500_flags; /* none required so far */
+static unsigned int wm8880_flags = VT8500_HAS_SWRTSCTS_SWITCH;
+
+static const struct of_device_id wmt_dt_ids[] = {
+ { .compatible = "via,vt8500-uart", .data = &vt8500_flags},
+ { .compatible = "wm,wm8880-uart", .data = &wm8880_flags},
+ {}
+};
+
static int vt8500_serial_probe(struct platform_device *pdev)
{
struct vt8500_port *vt8500_port;
struct resource *mmres, *irqres;
struct device_node *np = pdev->dev.of_node;
+ const struct of_device_id *match;
+ const unsigned int *flags;
int ret;
int port;
+ match = of_match_device(wmt_dt_ids, &pdev->dev);
+ if (!match)
+ return -EINVAL;
+
+ flags = match->data;
+
mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irqres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!mmres || !irqres)
@@ -605,6 +651,7 @@ static int vt8500_serial_probe(struct platform_device *pdev)
return ret;
}
+ vt8500_port->vt8500_uart_flags = *flags;
vt8500_port->uart.type = PORT_VT8500;
vt8500_port->uart.iotype = UPIO_MEM;
vt8500_port->uart.mapbase = mmres->start;
@@ -639,11 +686,6 @@ static int vt8500_serial_remove(struct platform_device *pdev)
return 0;
}
-static const struct of_device_id wmt_dt_ids[] = {
- { .compatible = "via,vt8500-uart", },
- {}
-};
-
static struct platform_driver vt8500_platform_driver = {
.probe = vt8500_serial_probe,
.remove = vt8500_serial_remove,