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-rw-r--r--drivers/serial/amba-pl011.c30
-rw-r--r--include/linux/amba/serial.h3
2 files changed, 30 insertions, 3 deletions
diff --git a/drivers/serial/amba-pl011.c b/drivers/serial/amba-pl011.c
index 4cfa1eb..8c5bda2 100644
--- a/drivers/serial/amba-pl011.c
+++ b/drivers/serial/amba-pl011.c
@@ -70,6 +70,23 @@ struct uart_amba_port {
struct clk *clk;
unsigned int im; /* interrupt mask */
unsigned int old_status;
+ unsigned int ifls; /* vendor-specific */
+};
+
+/* There is by now at least one vendor with differing details, so handle it */
+struct vendor_data {
+ unsigned int ifls;
+ unsigned int fifosize;
+};
+
+static struct vendor_data vendor_arm = {
+ .ifls = UART011_IFLS_RX4_8|UART011_IFLS_TX4_8,
+ .fifosize = 16,
+};
+
+static struct vendor_data vendor_st = {
+ .ifls = UART011_IFLS_RX_HALF|UART011_IFLS_TX_HALF,
+ .fifosize = 64,
};
static void pl011_stop_tx(struct uart_port *port)
@@ -360,8 +377,7 @@ static int pl011_startup(struct uart_port *port)
if (retval)
goto clk_dis;
- writew(UART011_IFLS_RX4_8|UART011_IFLS_TX4_8,
- uap->port.membase + UART011_IFLS);
+ writew(uap->ifls, uap->port.membase + UART011_IFLS);
/*
* Provoke TX FIFO interrupt into asserting.
@@ -732,6 +748,7 @@ static struct uart_driver amba_reg = {
static int pl011_probe(struct amba_device *dev, struct amba_id *id)
{
struct uart_amba_port *uap;
+ struct vendor_data *vendor = id->data;
void __iomem *base;
int i, ret;
@@ -762,12 +779,13 @@ static int pl011_probe(struct amba_device *dev, struct amba_id *id)
goto unmap;
}
+ uap->ifls = vendor->ifls;
uap->port.dev = &dev->dev;
uap->port.mapbase = dev->res.start;
uap->port.membase = base;
uap->port.iotype = UPIO_MEM;
uap->port.irq = dev->irq[0];
- uap->port.fifosize = 16;
+ uap->port.fifosize = vendor->fifosize;
uap->port.ops = &amba_pl011_pops;
uap->port.flags = UPF_BOOT_AUTOCONF;
uap->port.line = i;
@@ -812,6 +830,12 @@ static struct amba_id pl011_ids[] __initdata = {
{
.id = 0x00041011,
.mask = 0x000fffff,
+ .data = &vendor_arm,
+ },
+ {
+ .id = 0x00380802,
+ .mask = 0x00ffffff,
+ .data = &vendor_st,
},
{ 0, 0 },
};
diff --git a/include/linux/amba/serial.h b/include/linux/amba/serial.h
index 48ee32a..42949e2 100644
--- a/include/linux/amba/serial.h
+++ b/include/linux/amba/serial.h
@@ -114,6 +114,9 @@
#define UART011_IFLS_TX4_8 (2 << 0)
#define UART011_IFLS_TX6_8 (3 << 0)
#define UART011_IFLS_TX7_8 (4 << 0)
+/* special values for ST vendor with deeper fifo */
+#define UART011_IFLS_RX_HALF (5 << 3)
+#define UART011_IFLS_TX_HALF (5 << 0)
#define UART011_OEIM (1 << 10) /* overrun error interrupt mask */
#define UART011_BEIM (1 << 9) /* break error interrupt mask */
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