[ARM] 3639/1: S3C2412: serial port support
Patch from Ben Dooks
Serial port support for the on-board UART blocks
on the Samsung S3C2412 and S3C2413 UARTs.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/serial/s3c2410.c b/drivers/serial/s3c2410.c
index 53c2465..837b6da 100644
--- a/drivers/serial/s3c2410.c
+++ b/drivers/serial/s3c2410.c
@@ -872,6 +872,8 @@
return "S3C2410";
case PORT_S3C2440:
return "S3C2440";
+ case PORT_S3C2412:
+ return "S3C2412";
default:
return NULL;
}
@@ -1528,6 +1530,141 @@
#define s3c2440_uart_inf_at NULL
#endif /* CONFIG_CPU_S3C2440 */
+#if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413)
+
+static int s3c2412_serial_setsource(struct uart_port *port,
+ struct s3c24xx_uart_clksrc *clk)
+{
+ unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+ ucon &= ~S3C2412_UCON_CLKMASK;
+
+ if (strcmp(clk->name, "uclk") == 0)
+ ucon |= S3C2440_UCON_UCLK;
+ else if (strcmp(clk->name, "pclk") == 0)
+ ucon |= S3C2440_UCON_PCLK;
+ else if (strcmp(clk->name, "usysclk") == 0)
+ ucon |= S3C2412_UCON_USYSCLK;
+ else {
+ printk(KERN_ERR "unknown clock source %s\n", clk->name);
+ return -EINVAL;
+ }
+
+ wr_regl(port, S3C2410_UCON, ucon);
+ return 0;
+}
+
+
+static int s3c2412_serial_getsource(struct uart_port *port,
+ struct s3c24xx_uart_clksrc *clk)
+{
+ unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+ switch (ucon & S3C2412_UCON_CLKMASK) {
+ case S3C2412_UCON_UCLK:
+ clk->divisor = 1;
+ clk->name = "uclk";
+ break;
+
+ case S3C2412_UCON_PCLK:
+ case S3C2412_UCON_PCLK2:
+ clk->divisor = 1;
+ clk->name = "pclk";
+ break;
+
+ case S3C2412_UCON_USYSCLK:
+ clk->divisor = 1;
+ clk->name = "usysclk";
+ break;
+ }
+
+ return 0;
+}
+
+static int s3c2412_serial_resetport(struct uart_port *port,
+ struct s3c2410_uartcfg *cfg)
+{
+ unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+ dbg("%s: port=%p (%08lx), cfg=%p\n",
+ __FUNCTION__, port, port->mapbase, cfg);
+
+ /* ensure we don't change the clock settings... */
+
+ ucon &= S3C2412_UCON_CLKMASK;
+
+ wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
+ wr_regl(port, S3C2410_ULCON, cfg->ulcon);
+
+ /* reset both fifos */
+
+ wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
+ wr_regl(port, S3C2410_UFCON, cfg->ufcon);
+
+ return 0;
+}
+
+static struct s3c24xx_uart_info s3c2412_uart_inf = {
+ .name = "Samsung S3C2412 UART",
+ .type = PORT_S3C2412,
+ .fifosize = 64,
+ .rx_fifomask = S3C2440_UFSTAT_RXMASK,
+ .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
+ .rx_fifofull = S3C2440_UFSTAT_RXFULL,
+ .tx_fifofull = S3C2440_UFSTAT_TXFULL,
+ .tx_fifomask = S3C2440_UFSTAT_TXMASK,
+ .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
+ .get_clksrc = s3c2412_serial_getsource,
+ .set_clksrc = s3c2412_serial_setsource,
+ .reset_port = s3c2412_serial_resetport,
+};
+
+/* device management */
+
+static int s3c2412_serial_probe(struct platform_device *dev)
+{
+ dbg("s3c2440_serial_probe: dev=%p\n", dev);
+ return s3c24xx_serial_probe(dev, &s3c2440_uart_inf);
+}
+
+static struct platform_driver s3c2412_serial_drv = {
+ .probe = s3c2412_serial_probe,
+ .remove = s3c24xx_serial_remove,
+ .suspend = s3c24xx_serial_suspend,
+ .resume = s3c24xx_serial_resume,
+ .driver = {
+ .name = "s3c2412-uart",
+ .owner = THIS_MODULE,
+ },
+};
+
+
+static inline int s3c2412_serial_init(void)
+{
+ return s3c24xx_serial_init(&s3c2412_serial_drv, &s3c2412_uart_inf);
+}
+
+static inline void s3c2412_serial_exit(void)
+{
+ platform_driver_unregister(&s3c2412_serial_drv);
+}
+
+#define s3c2412_uart_inf_at &s3c2412_uart_inf
+#else
+
+static inline int s3c2412_serial_init(void)
+{
+ return 0;
+}
+
+static inline void s3c2412_serial_exit(void)
+{
+}
+
+#define s3c2412_uart_inf_at NULL
+#endif /* CONFIG_CPU_S3C2440 */
+
+
/* module initialisation code */
static int __init s3c24xx_serial_modinit(void)
@@ -1542,6 +1679,7 @@
s3c2400_serial_init();
s3c2410_serial_init();
+ s3c2412_serial_init();
s3c2440_serial_init();
return 0;
@@ -1551,6 +1689,7 @@
{
s3c2400_serial_exit();
s3c2410_serial_exit();
+ s3c2412_serial_exit();
s3c2440_serial_exit();
uart_unregister_driver(&s3c24xx_uart_drv);
@@ -1773,6 +1912,8 @@
info = s3c2410_uart_inf_at;
} else if (strcmp(dev->name, "s3c2440-uart") == 0) {
info = s3c2440_uart_inf_at;
+ } else if (strcmp(dev->name, "s3c2412-uart") == 0) {
+ info = s3c2412_uart_inf_at;
} else {
printk(KERN_ERR "s3c24xx: no driver for %s\n", dev->name);
return 0;
@@ -1796,4 +1937,4 @@
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
-MODULE_DESCRIPTION("Samsung S3C2410/S3C2440 Serial port driver");
+MODULE_DESCRIPTION("Samsung S3C2410/S3C2440/S3C2412 Serial port driver");