tty: serial: samsung_tty: support more than 4 uart ports

Regarding Exynos Auto v9 SoC, it supports uarts up to 12. However, the
maximum number of the ports has been derived from
CONFIG_SERIAL_SAMSUNG_UARTS and tightly coupled with the config for
previous Samsung SoCs such as s3c24xx and s3c64xx. To overcome this
limitation, this changes the usage of the definition to UART_NR which is
widely used from other serial drivers. This also defines the value to 12
only for ARM64 SoCs to not affect the change to previous arm32 SoCs.

Instead of enumerating all the ports as predefined arrays, this
introduces s3c24xx_serial_init_port_default that is initializing the
structure as the default value.

Reviewed-by: Hector Martin <marcan@marcan.st>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Link: https://lore.kernel.org/r/20220629005538.60132-1-chanho61.park@samsung.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index d5ca904def345df46e3483b296fcb52d67583708..3e0aa292360505090aa0d4e80c6a573d577a3193 100644 (file)
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -48,6 +48,12 @@
 #define S3C24XX_SERIAL_MAJOR   204
 #define S3C24XX_SERIAL_MINOR   64
 
+#ifdef CONFIG_ARM64
+#define UART_NR                        12
+#else
+#define UART_NR                        CONFIG_SERIAL_SAMSUNG_UARTS
+#endif
+
 #define S3C24XX_TX_PIO                 1
 #define S3C24XX_TX_DMA                 2
 #define S3C24XX_RX_PIO                 1
@@ -87,7 +93,7 @@ struct s3c24xx_uart_info {
 struct s3c24xx_serial_drv_data {
        const struct s3c24xx_uart_info  info;
        const struct s3c2410_uartcfg    def_cfg;
-       const unsigned int              fifosize[CONFIG_SERIAL_SAMSUNG_UARTS];
+       const unsigned int              fifosize[UART_NR];
 };
 
 struct s3c24xx_uart_dma {
@@ -1802,67 +1808,27 @@ static const struct uart_ops apple_s5l_serial_ops = {
 static struct uart_driver s3c24xx_uart_drv = {
        .owner          = THIS_MODULE,
        .driver_name    = "s3c2410_serial",
-       .nr             = CONFIG_SERIAL_SAMSUNG_UARTS,
+       .nr             = UART_NR,
        .cons           = S3C24XX_SERIAL_CONSOLE,
        .dev_name       = S3C24XX_SERIAL_NAME,
        .major          = S3C24XX_SERIAL_MAJOR,
        .minor          = S3C24XX_SERIAL_MINOR,
 };
 
-#define __PORT_LOCK_UNLOCKED(i) \
-       __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[i].port.lock)
-static struct s3c24xx_uart_port
-s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = {
-       [0] = {
-               .port = {
-                       .lock           = __PORT_LOCK_UNLOCKED(0),
-                       .iotype         = UPIO_MEM,
-                       .uartclk        = 0,
-                       .fifosize       = 16,
-                       .ops            = &s3c24xx_serial_ops,
-                       .flags          = UPF_BOOT_AUTOCONF,
-                       .line           = 0,
-               }
-       },
-       [1] = {
-               .port = {
-                       .lock           = __PORT_LOCK_UNLOCKED(1),
-                       .iotype         = UPIO_MEM,
-                       .uartclk        = 0,
-                       .fifosize       = 16,
-                       .ops            = &s3c24xx_serial_ops,
-                       .flags          = UPF_BOOT_AUTOCONF,
-                       .line           = 1,
-               }
-       },
-#if CONFIG_SERIAL_SAMSUNG_UARTS > 2
-       [2] = {
-               .port = {
-                       .lock           = __PORT_LOCK_UNLOCKED(2),
-                       .iotype         = UPIO_MEM,
-                       .uartclk        = 0,
-                       .fifosize       = 16,
-                       .ops            = &s3c24xx_serial_ops,
-                       .flags          = UPF_BOOT_AUTOCONF,
-                       .line           = 2,
-               }
-       },
-#endif
-#if CONFIG_SERIAL_SAMSUNG_UARTS > 3
-       [3] = {
-               .port = {
-                       .lock           = __PORT_LOCK_UNLOCKED(3),
-                       .iotype         = UPIO_MEM,
-                       .uartclk        = 0,
-                       .fifosize       = 16,
-                       .ops            = &s3c24xx_serial_ops,
-                       .flags          = UPF_BOOT_AUTOCONF,
-                       .line           = 3,
-               }
-       }
-#endif
-};
-#undef __PORT_LOCK_UNLOCKED
+static struct s3c24xx_uart_port s3c24xx_serial_ports[UART_NR];
+
+static void s3c24xx_serial_init_port_default(int index) {
+       struct uart_port *port = &s3c24xx_serial_ports[index].port;
+
+       spin_lock_init(&port->lock);
+
+       port->iotype = UPIO_MEM;
+       port->uartclk = 0;
+       port->fifosize = 16;
+       port->ops = &s3c24xx_serial_ops;
+       port->flags = UPF_BOOT_AUTOCONF;
+       port->line = index;
+}
 
 /* s3c24xx_serial_resetport
  *
@@ -2178,6 +2144,8 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
        }
        ourport = &s3c24xx_serial_ports[index];
 
+       s3c24xx_serial_init_port_default(index);
+
        ourport->drv_data = s3c24xx_get_driver_data(pdev);
        if (!ourport->drv_data) {
                dev_err(&pdev->dev, "could not find driver data\n");
@@ -2576,7 +2544,7 @@ s3c24xx_serial_console_setup(struct console *co, char *options)
 
        /* is this a valid port */
 
-       if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS)
+       if (co->index == -1 || co->index >= UART_NR)
                co->index = 0;
 
        port = &s3c24xx_serial_ports[co->index].port;