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authorVladimir Murzin <vladimir.murzin@arm.com>2019-01-30 12:55:14 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-01-30 13:48:08 +0300
commit9f25e07b882bd167a952abc4bf10b37e95893110 (patch)
tree91c25477262388f513e12a49afa91b18d5c82fe7 /drivers/tty
parent3c635e4f14482bc11e25461892f3ae193e5266f8 (diff)
downloadlinux-9f25e07b882bd167a952abc4bf10b37e95893110.tar.xz
serial: mps2-uart: move to dynamic port allocation
Some designs, like MPS3, expose number of virtual serial ports which already close or exceeds MPS2_MAX_PORTS. Increasing MPS2_MAX_PORTS would have negative impact (in terms of memory consumption) on tiny MPS2 platform which, in fact, has only one physically populated UART. Start with converting existent static port array to idr. As a bonus it make driver not to fail in case when no alias was specified in device tree. Note: there is no need in idr_destroy() because code doesn't unload since ce87122911f8 ("serial: mps2-uart: make driver explicitly non-modular") Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/mps2-uart.c47
1 files changed, 31 insertions, 16 deletions
diff --git a/drivers/tty/serial/mps2-uart.c b/drivers/tty/serial/mps2-uart.c
index 9f8f63719126..6da0633f36ee 100644
--- a/drivers/tty/serial/mps2-uart.c
+++ b/drivers/tty/serial/mps2-uart.c
@@ -22,6 +22,7 @@
#include <linux/serial_core.h>
#include <linux/tty_flip.h>
#include <linux/types.h>
+#include <linux/idr.h>
#define SERIAL_NAME "ttyMPS"
#define DRIVER_NAME "mps2-uart"
@@ -397,7 +398,7 @@ static const struct uart_ops mps2_uart_pops = {
.verify_port = mps2_uart_verify_port,
};
-static struct mps2_uart_port mps2_uart_ports[MPS2_MAX_PORTS];
+static DEFINE_IDR(ports_idr);
#ifdef CONFIG_SERIAL_MPS2_UART_CONSOLE
static void mps2_uart_console_putchar(struct uart_port *port, int ch)
@@ -410,7 +411,8 @@ static void mps2_uart_console_putchar(struct uart_port *port, int ch)
static void mps2_uart_console_write(struct console *co, const char *s, unsigned int cnt)
{
- struct uart_port *port = &mps2_uart_ports[co->index].port;
+ struct mps2_uart_port *mps_port = idr_find(&ports_idr, co->index);
+ struct uart_port *port = &mps_port->port;
uart_console_write(port, s, cnt, mps2_uart_console_putchar);
}
@@ -426,7 +428,10 @@ static int mps2_uart_console_setup(struct console *co, char *options)
if (co->index < 0 || co->index >= MPS2_MAX_PORTS)
return -ENODEV;
- mps_port = &mps2_uart_ports[co->index];
+ mps_port = idr_find(&ports_idr, co->index);
+
+ if (!mps_port)
+ return -ENODEV;
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
@@ -487,27 +492,32 @@ static struct uart_driver mps2_uart_driver = {
.cons = MPS2_SERIAL_CONSOLE,
};
-static struct mps2_uart_port *mps2_of_get_port(struct platform_device *pdev)
+static int mps2_of_get_port(struct platform_device *pdev,
+ struct mps2_uart_port *mps_port)
{
struct device_node *np = pdev->dev.of_node;
int id;
if (!np)
- return NULL;
+ return -ENODEV;
id = of_alias_get_id(np, "serial");
+
+ if (id < 0)
+ id = idr_alloc_cyclic(&ports_idr, (void *)mps_port, 0, MPS2_MAX_PORTS, GFP_KERNEL);
+ else
+ id = idr_alloc(&ports_idr, (void *)mps_port, id, MPS2_MAX_PORTS, GFP_KERNEL);
+
if (id < 0)
- id = 0;
+ return id;
- if (WARN_ON(id >= MPS2_MAX_PORTS))
- return NULL;
+ mps_port->port.line = id;
- mps2_uart_ports[id].port.line = id;
- return &mps2_uart_ports[id];
+ return 0;
}
-static int mps2_init_port(struct mps2_uart_port *mps_port,
- struct platform_device *pdev)
+static int mps2_init_port(struct platform_device *pdev,
+ struct mps2_uart_port *mps_port)
{
struct resource *res;
int ret;
@@ -550,11 +560,16 @@ static int mps2_serial_probe(struct platform_device *pdev)
struct mps2_uart_port *mps_port;
int ret;
- mps_port = mps2_of_get_port(pdev);
- if (!mps_port)
- return -ENODEV;
+ mps_port = devm_kzalloc(&pdev->dev, sizeof(struct mps2_uart_port), GFP_KERNEL);
+
+ if (!mps_port)
+ return -ENOMEM;
+
+ ret = mps2_of_get_port(pdev, mps_port);
+ if (ret)
+ return ret;
- ret = mps2_init_port(mps_port, pdev);
+ ret = mps2_init_port(pdev, mps_port);
if (ret)
return ret;