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path: root/drivers/tty/serial/ar933x_uart.c
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Diffstat (limited to 'drivers/tty/serial/ar933x_uart.c')
-rw-r--r--drivers/tty/serial/ar933x_uart.c111
1 files changed, 67 insertions, 44 deletions
diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
index 27f20c57abed..acd03af7cd52 100644
--- a/drivers/tty/serial/ar933x_uart.c
+++ b/drivers/tty/serial/ar933x_uart.c
@@ -17,6 +17,8 @@
#include <linux/sysrq.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
@@ -24,11 +26,11 @@
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/irq.h>
+#include <linux/clk.h>
#include <asm/div64.h>
#include <asm/mach-ath79/ar933x_uart.h>
-#include <asm/mach-ath79/ar933x_uart_platform.h>
#define DRIVER_NAME "ar933x-uart"
@@ -47,8 +49,14 @@ struct ar933x_uart_port {
unsigned int ier; /* shadow Interrupt Enable Register */
unsigned int min_baud;
unsigned int max_baud;
+ struct clk *clk;
};
+static inline bool ar933x_uart_console_enabled(void)
+{
+ return config_enabled(CONFIG_SERIAL_AR933X_CONSOLE);
+}
+
static inline unsigned int ar933x_uart_read(struct ar933x_uart_port *up,
int offset)
{
@@ -322,7 +330,9 @@ static void ar933x_uart_rx_chars(struct ar933x_uart_port *up)
tty_insert_flip_char(port, ch, TTY_NORMAL);
} while (max_count-- > 0);
+ spin_unlock(&up->port.lock);
tty_flip_buffer_push(port);
+ spin_lock(&up->port.lock);
}
static void ar933x_uart_tx_chars(struct ar933x_uart_port *up)
@@ -497,8 +507,6 @@ static struct uart_ops ar933x_uart_ops = {
.verify_port = ar933x_uart_verify_port,
};
-#ifdef CONFIG_SERIAL_AR933X_CONSOLE
-
static struct ar933x_uart_port *
ar933x_console_ports[CONFIG_SERIAL_AR933X_NR_UARTS];
@@ -597,80 +605,88 @@ static struct console ar933x_uart_console = {
static void ar933x_uart_add_console_port(struct ar933x_uart_port *up)
{
+ if (!ar933x_uart_console_enabled())
+ return;
+
ar933x_console_ports[up->port.line] = up;
}
-#define AR933X_SERIAL_CONSOLE (&ar933x_uart_console)
-
-#else
-
-static inline void ar933x_uart_add_console_port(struct ar933x_uart_port *up) {}
-
-#define AR933X_SERIAL_CONSOLE NULL
-
-#endif /* CONFIG_SERIAL_AR933X_CONSOLE */
-
static struct uart_driver ar933x_uart_driver = {
.owner = THIS_MODULE,
.driver_name = DRIVER_NAME,
.dev_name = "ttyATH",
.nr = CONFIG_SERIAL_AR933X_NR_UARTS,
- .cons = AR933X_SERIAL_CONSOLE,
+ .cons = NULL, /* filled in runtime */
};
static int ar933x_uart_probe(struct platform_device *pdev)
{
- struct ar933x_uart_platform_data *pdata;
struct ar933x_uart_port *up;
struct uart_port *port;
struct resource *mem_res;
struct resource *irq_res;
+ struct device_node *np;
unsigned int baud;
int id;
int ret;
- pdata = pdev->dev.platform_data;
- if (!pdata)
- return -EINVAL;
-
- id = pdev->id;
- if (id == -1)
- id = 0;
+ np = pdev->dev.of_node;
+ if (config_enabled(CONFIG_OF) && np) {
+ id = of_alias_get_id(np, "serial");
+ if (id < 0) {
+ dev_err(&pdev->dev, "unable to get alias id, err=%d\n",
+ id);
+ return id;
+ }
+ } else {
+ id = pdev->id;
+ if (id == -1)
+ id = 0;
+ }
if (id > CONFIG_SERIAL_AR933X_NR_UARTS)
return -EINVAL;
- mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!mem_res) {
- dev_err(&pdev->dev, "no MEM resource\n");
- return -EINVAL;
- }
-
irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!irq_res) {
dev_err(&pdev->dev, "no IRQ resource\n");
return -EINVAL;
}
- up = kzalloc(sizeof(struct ar933x_uart_port), GFP_KERNEL);
+ up = devm_kzalloc(&pdev->dev, sizeof(struct ar933x_uart_port),
+ GFP_KERNEL);
if (!up)
return -ENOMEM;
+ up->clk = devm_clk_get(&pdev->dev, "uart");
+ if (IS_ERR(up->clk)) {
+ dev_err(&pdev->dev, "unable to get UART clock\n");
+ return PTR_ERR(up->clk);
+ }
+
port = &up->port;
- port->mapbase = mem_res->start;
- port->membase = ioremap(mem_res->start, AR933X_UART_REGS_SIZE);
- if (!port->membase) {
- ret = -ENOMEM;
- goto err_free_up;
+ mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ port->membase = devm_ioremap_resource(&pdev->dev, mem_res);
+ if (IS_ERR(port->membase))
+ return PTR_ERR(port->membase);
+
+ ret = clk_prepare_enable(up->clk);
+ if (ret)
+ return ret;
+
+ port->uartclk = clk_get_rate(up->clk);
+ if (!port->uartclk) {
+ ret = -EINVAL;
+ goto err_disable_clk;
}
+ port->mapbase = mem_res->start;
port->line = id;
port->irq = irq_res->start;
port->dev = &pdev->dev;
port->type = PORT_AR933X;
port->iotype = UPIO_MEM32;
- port->uartclk = pdata->uartclk;
port->regshift = 2;
port->fifosize = AR933X_UART_FIFO_SIZE;
@@ -686,15 +702,13 @@ static int ar933x_uart_probe(struct platform_device *pdev)
ret = uart_add_one_port(&ar933x_uart_driver, &up->port);
if (ret)
- goto err_unmap;
+ goto err_disable_clk;
platform_set_drvdata(pdev, up);
return 0;
-err_unmap:
- iounmap(up->port.membase);
-err_free_up:
- kfree(up);
+err_disable_clk:
+ clk_disable_unprepare(up->clk);
return ret;
}
@@ -703,23 +717,30 @@ static int ar933x_uart_remove(struct platform_device *pdev)
struct ar933x_uart_port *up;
up = platform_get_drvdata(pdev);
- platform_set_drvdata(pdev, NULL);
if (up) {
uart_remove_one_port(&ar933x_uart_driver, &up->port);
- iounmap(up->port.membase);
- kfree(up);
+ clk_disable_unprepare(up->clk);
}
return 0;
}
+#ifdef CONFIG_OF
+static const struct of_device_id ar933x_uart_of_ids[] = {
+ { .compatible = "qca,ar9330-uart" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ar933x_uart_of_ids);
+#endif
+
static struct platform_driver ar933x_uart_platform_driver = {
.probe = ar933x_uart_probe,
.remove = ar933x_uart_remove,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(ar933x_uart_of_ids),
},
};
@@ -727,7 +748,9 @@ static int __init ar933x_uart_init(void)
{
int ret;
- ar933x_uart_driver.nr = CONFIG_SERIAL_AR933X_NR_UARTS;
+ if (ar933x_uart_console_enabled())
+ ar933x_uart_driver.cons = &ar933x_uart_console;
+
ret = uart_register_driver(&ar933x_uart_driver);
if (ret)
goto err_out;
generated by cgit v1.2.3 (git 2.0.4) at 2024-05-24 22:47:58 +0000