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path: root/drivers/tty/serial/of_serial.c
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Diffstat (limited to 'drivers/tty/serial/of_serial.c')
-rw-r--r--drivers/tty/serial/of_serial.c108
1 files changed, 94 insertions, 14 deletions
diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
index e8c9cee07d0..68d4455f3cf 100644
--- a/drivers/tty/serial/of_serial.c
+++ b/drivers/tty/serial/of_serial.c
@@ -9,26 +9,53 @@
* 2 of the License, or (at your option) any later version.
*
*/
-#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
+#include <linux/delay.h>
#include <linux/serial_core.h>
-#include <linux/serial_8250.h>
+#include <linux/serial_reg.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/nwpserial.h>
+#include <linux/clk.h>
+
+#include "8250/8250.h"
struct of_serial_info {
+ struct clk *clk;
int type;
int line;
};
+#ifdef CONFIG_ARCH_TEGRA
+void tegra_serial_handle_break(struct uart_port *p)
+{
+ unsigned int status, tmout = 10000;
+
+ do {
+ status = p->serial_in(p, UART_LSR);
+ if (status & (UART_LSR_FIFOE | UART_LSR_BRK_ERROR_BITS))
+ status = p->serial_in(p, UART_RX);
+ else
+ break;
+ if (--tmout == 0)
+ break;
+ udelay(1);
+ } while (1);
+}
+#else
+static inline void tegra_serial_handle_break(struct uart_port *port)
+{
+}
+#endif
+
/*
* Fill a struct uart_port for a given device node
*/
-static int __devinit of_platform_serial_setup(struct platform_device *ofdev,
- int type, struct uart_port *port)
+static int of_platform_serial_setup(struct platform_device *ofdev,
+ int type, struct uart_port *port,
+ struct of_serial_info *info)
{
struct resource resource;
struct device_node *np = ofdev->dev.of_node;
@@ -37,8 +64,17 @@ static int __devinit of_platform_serial_setup(struct platform_device *ofdev,
memset(port, 0, sizeof *port);
if (of_property_read_u32(np, "clock-frequency", &clk)) {
- dev_warn(&ofdev->dev, "no clock-frequency property set\n");
- return -ENODEV;
+
+ /* Get clk rate through clk driver if present */
+ info->clk = clk_get(&ofdev->dev, NULL);
+ if (IS_ERR(info->clk)) {
+ dev_warn(&ofdev->dev,
+ "clk or clock-frequency not defined\n");
+ return PTR_ERR(info->clk);
+ }
+
+ clk_prepare_enable(info->clk);
+ clk = clk_get_rate(info->clk);
}
/* If current-speed was set, then try not to change it. */
if (of_property_read_u32(np, "current-speed", &spd) == 0)
@@ -47,7 +83,7 @@ static int __devinit of_platform_serial_setup(struct platform_device *ofdev,
ret = of_address_to_resource(np, 0, &resource);
if (ret) {
dev_warn(&ofdev->dev, "invalid address\n");
- return ret;
+ goto out;
}
spin_lock_init(&port->lock);
@@ -61,6 +97,10 @@ static int __devinit of_platform_serial_setup(struct platform_device *ofdev,
if (of_property_read_u32(np, "reg-shift", &prop) == 0)
port->regshift = prop;
+ /* Check for fifo size */
+ if (of_property_read_u32(np, "fifo-size", &prop) == 0)
+ port->fifosize = prop;
+
port->irq = irq_of_parse_and_map(np, 0);
port->iotype = UPIO_MEM;
if (of_property_read_u32(np, "reg-io-width", &prop) == 0) {
@@ -74,7 +114,8 @@ static int __devinit of_platform_serial_setup(struct platform_device *ofdev,
default:
dev_warn(&ofdev->dev, "unsupported reg-io-width (%d)\n",
prop);
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
}
@@ -82,16 +123,27 @@ static int __devinit of_platform_serial_setup(struct platform_device *ofdev,
port->uartclk = clk;
port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP
| UPF_FIXED_PORT | UPF_FIXED_TYPE;
+
+ if (of_find_property(np, "no-loopback-test", NULL))
+ port->flags |= UPF_SKIP_TEST;
+
port->dev = &ofdev->dev;
+ if (type == PORT_TEGRA)
+ port->handle_break = tegra_serial_handle_break;
+
return 0;
+out:
+ if (info->clk)
+ clk_disable_unprepare(info->clk);
+ return ret;
}
/*
* Try to register a serial port
*/
static struct of_device_id of_platform_serial_table[];
-static int __devinit of_platform_serial_probe(struct platform_device *ofdev)
+static int of_platform_serial_probe(struct platform_device *ofdev)
{
const struct of_device_id *match;
struct of_serial_info *info;
@@ -111,15 +163,33 @@ static int __devinit of_platform_serial_probe(struct platform_device *ofdev)
return -ENOMEM;
port_type = (unsigned long)match->data;
- ret = of_platform_serial_setup(ofdev, port_type, &port);
+ ret = of_platform_serial_setup(ofdev, port_type, &port, info);
if (ret)
goto out;
switch (port_type) {
#ifdef CONFIG_SERIAL_8250
case PORT_8250 ... PORT_MAX_8250:
- ret = serial8250_register_port(&port);
+ {
+ struct uart_8250_port port8250;
+ memset(&port8250, 0, sizeof(port8250));
+ port.type = port_type;
+ port8250.port = port;
+
+ if (port.fifosize)
+ port8250.capabilities = UART_CAP_FIFO;
+
+ if (of_property_read_bool(ofdev->dev.of_node,
+ "auto-flow-control"))
+ port8250.capabilities |= UART_CAP_AFE;
+
+ if (of_property_read_bool(ofdev->dev.of_node,
+ "has-hw-flow-control"))
+ port8250.port.flags |= UPF_HARD_FLOW;
+
+ ret = serial8250_register_8250_port(&port8250);
break;
+ }
#endif
#ifdef CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL
case PORT_NWPSERIAL:
@@ -138,7 +208,7 @@ static int __devinit of_platform_serial_probe(struct platform_device *ofdev)
info->type = port_type;
info->line = ret;
- dev_set_drvdata(&ofdev->dev, info);
+ platform_set_drvdata(ofdev, info);
return 0;
out:
kfree(info);
@@ -151,7 +221,7 @@ out:
*/
static int of_platform_serial_remove(struct platform_device *ofdev)
{
- struct of_serial_info *info = dev_get_drvdata(&ofdev->dev);
+ struct of_serial_info *info = platform_get_drvdata(ofdev);
switch (info->type) {
#ifdef CONFIG_SERIAL_8250
case PORT_8250 ... PORT_MAX_8250:
@@ -167,6 +237,9 @@ static int of_platform_serial_remove(struct platform_device *ofdev)
/* need to add code for these */
break;
}
+
+ if (info->clk)
+ clk_disable_unprepare(info->clk);
kfree(info);
return 0;
}
@@ -174,7 +247,7 @@ static int of_platform_serial_remove(struct platform_device *ofdev)
/*
* A few common types, add more as needed.
*/
-static struct of_device_id __devinitdata of_platform_serial_table[] = {
+static struct of_device_id of_platform_serial_table[] = {
{ .compatible = "ns8250", .data = (void *)PORT_8250, },
{ .compatible = "ns16450", .data = (void *)PORT_16450, },
{ .compatible = "ns16550a", .data = (void *)PORT_16550A, },
@@ -182,6 +255,13 @@ static struct of_device_id __devinitdata of_platform_serial_table[] = {
{ .compatible = "ns16750", .data = (void *)PORT_16750, },
{ .compatible = "ns16850", .data = (void *)PORT_16850, },
{ .compatible = "nvidia,tegra20-uart", .data = (void *)PORT_TEGRA, },
+ { .compatible = "nxp,lpc3220-uart", .data = (void *)PORT_LPC3220, },
+ { .compatible = "altr,16550-FIFO32",
+ .data = (void *)PORT_ALTR_16550_F32, },
+ { .compatible = "altr,16550-FIFO64",
+ .data = (void *)PORT_ALTR_16550_F64, },
+ { .compatible = "altr,16550-FIFO128",
+ .data = (void *)PORT_ALTR_16550_F128, },
#ifdef CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL
{ .compatible = "ibm,qpace-nwp-serial",
.data = (void *)PORT_NWPSERIAL, },
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 19:11:35 +0000