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path: root/drivers/tty/serial/arc_uart.c
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Diffstat (limited to 'drivers/tty/serial/arc_uart.c')
-rw-r--r--drivers/tty/serial/arc_uart.c104
1 files changed, 68 insertions, 36 deletions
diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c
index 3e0b3fac6a0e..d97e194b6bc5 100644
--- a/drivers/tty/serial/arc_uart.c
+++ b/drivers/tty/serial/arc_uart.c
@@ -37,6 +37,8 @@
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
/*************************************
* ARC UART Hardware Specs
@@ -209,12 +211,8 @@ static void arc_serial_start_tx(struct uart_port *port)
static void arc_serial_rx_chars(struct arc_uart_port *uart)
{
- struct tty_struct *tty = tty_port_tty_get(&uart->port.state->port);
unsigned int status, ch, flg = 0;
- if (!tty)
- return;
-
/*
* UART has 4 deep RX-FIFO. Driver's recongnition of this fact
* is very subtle. Here's how ...
@@ -250,10 +248,8 @@ static void arc_serial_rx_chars(struct arc_uart_port *uart)
uart_insert_char(&uart->port, status, RXOERR, ch, flg);
done:
- tty_flip_buffer_push(tty);
+ tty_flip_buffer_push(&uart->port.state->port);
}
-
- tty_kref_put(tty);
}
/*
@@ -526,18 +522,37 @@ static struct uart_ops arc_serial_pops = {
};
static int
-arc_uart_init_one(struct platform_device *pdev, struct arc_uart_port *uart)
+arc_uart_init_one(struct platform_device *pdev, int dev_id)
{
struct resource *res, *res2;
unsigned long *plat_data;
-
- if (pdev->id < 0 || pdev->id >= CONFIG_SERIAL_ARC_NR_PORTS) {
- dev_err(&pdev->dev, "Wrong uart platform device id.\n");
- return -ENOENT;
- }
+ struct arc_uart_port *uart = &arc_uart_ports[dev_id];
plat_data = ((unsigned long *)(pdev->dev.platform_data));
- uart->baud = plat_data[0];
+ if (!plat_data)
+ return -ENODEV;
+
+ uart->is_emulated = !!plat_data[0]; /* workaround ISS bug */
+
+ if (is_early_platform_device(pdev)) {
+ uart->port.uartclk = plat_data[1];
+ uart->baud = plat_data[2];
+ } else {
+ struct device_node *np = pdev->dev.of_node;
+ u32 val;
+
+ if (of_property_read_u32(np, "clock-frequency", &val)) {
+ dev_err(&pdev->dev, "clock-frequency property NOTset\n");
+ return -EINVAL;
+ }
+ uart->port.uartclk = val;
+
+ if (of_property_read_u32(np, "current-speed", &val)) {
+ dev_err(&pdev->dev, "current-speed property NOT set\n");
+ return -EINVAL;
+ }
+ uart->baud = val;
+ }
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
@@ -557,10 +572,9 @@ arc_uart_init_one(struct platform_device *pdev, struct arc_uart_port *uart)
uart->port.dev = &pdev->dev;
uart->port.iotype = UPIO_MEM;
uart->port.flags = UPF_BOOT_AUTOCONF;
- uart->port.line = pdev->id;
+ uart->port.line = dev_id;
uart->port.ops = &arc_serial_pops;
- uart->port.uartclk = plat_data[1];
uart->port.fifosize = ARC_UART_TX_FIFO_SIZE;
/*
@@ -569,9 +583,6 @@ arc_uart_init_one(struct platform_device *pdev, struct arc_uart_port *uart)
*/
uart->port.ignore_status_mask = 0;
- /* Real Hardware vs. emulated to work around a bug */
- uart->is_emulated = !!plat_data[2];
-
return 0;
}
@@ -648,45 +659,50 @@ static __init void early_serial_write(struct console *con, const char *s,
}
}
-static struct __initdata console arc_early_serial_console = {
+static struct console arc_early_serial_console __initdata = {
.name = "early_ARCuart",
.write = early_serial_write,
.flags = CON_PRINTBUFFER | CON_BOOT,
.index = -1
};
-static int arc_serial_probe_earlyprintk(struct platform_device *pdev)
+static int __init arc_serial_probe_earlyprintk(struct platform_device *pdev)
{
- arc_early_serial_console.index = pdev->id;
+ int dev_id = pdev->id < 0 ? 0 : pdev->id;
+ int rc;
+
+ arc_early_serial_console.index = dev_id;
- arc_uart_init_one(pdev, &arc_uart_ports[pdev->id]);
+ rc = arc_uart_init_one(pdev, dev_id);
+ if (rc)
+ panic("early console init failed\n");
arc_serial_console_setup(&arc_early_serial_console, NULL);
register_console(&arc_early_serial_console);
return 0;
}
-#else
-static int arc_serial_probe_earlyprintk(struct platform_device *pdev)
-{
- return -ENODEV;
-}
#endif /* CONFIG_SERIAL_ARC_CONSOLE */
static int arc_serial_probe(struct platform_device *pdev)
{
- struct arc_uart_port *uart;
- int rc;
+ int rc, dev_id;
+ struct device_node *np = pdev->dev.of_node;
+
+ /* no device tree device */
+ if (!np)
+ return -ENODEV;
- if (is_early_platform_device(pdev))
- return arc_serial_probe_earlyprintk(pdev);
+ dev_id = of_alias_get_id(np, "serial");
+ if (dev_id < 0)
+ dev_id = 0;
- uart = &arc_uart_ports[pdev->id];
- rc = arc_uart_init_one(pdev, uart);
+ rc = arc_uart_init_one(pdev, dev_id);
if (rc)
return rc;
- return uart_add_one_port(&arc_uart_driver, &uart->port);
+ rc = uart_add_one_port(&arc_uart_driver, &arc_uart_ports[dev_id].port);
+ return rc;
}
static int arc_serial_remove(struct platform_device *pdev)
@@ -695,16 +711,32 @@ static int arc_serial_remove(struct platform_device *pdev)
return 0;
}
+static const struct of_device_id arc_uart_dt_ids[] = {
+ { .compatible = "snps,arc-uart" },
+ { /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, arc_uart_dt_ids);
+
static struct platform_driver arc_platform_driver = {
.probe = arc_serial_probe,
.remove = arc_serial_remove,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
+ .of_match_table = arc_uart_dt_ids,
},
};
#ifdef CONFIG_SERIAL_ARC_CONSOLE
+
+static struct platform_driver early_arc_platform_driver __initdata = {
+ .probe = arc_serial_probe_earlyprintk,
+ .remove = arc_serial_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+};
/*
* Register an early platform driver of "earlyprintk" class.
* ARCH platform code installs the driver and probes the early devices
@@ -712,7 +744,7 @@ static struct platform_driver arc_platform_driver = {
* or it could be done independently, for all "earlyprintk" class drivers.
* [see arch/arc/plat-arcfpga/platform.c]
*/
-early_platform_init("earlyprintk", &arc_platform_driver);
+early_platform_init("earlyprintk", &early_arc_platform_driver);
#endif /* CONFIG_SERIAL_ARC_CONSOLE */