[PATCH 12/14] MACH SAMSUNG/S3C: Unify the UART driver for the S3C family of CPUs
Juergen Beisert
jbe at pengutronix.de
Sat Nov 26 15:22:59 EST 2011
The UART is one of the units which differs only slightly inside the S3C family.
Prepare this driver to share it with more recent CPUs.
Signed-off-by: Juergen Beisert <jbe at pengutronix.de>
---
arch/arm/boards/a9m2410/a9m2410.c | 2 +-
arch/arm/boards/a9m2440/a9m2440.c | 2 +-
arch/arm/boards/mini2440/mini2440.c | 2 +-
arch/arm/mach-samsung/include/mach/s3c-iomap.h | 15 ++---
drivers/serial/Kconfig | 10 ++--
drivers/serial/Makefile | 2 +-
drivers/serial/{serial_s3c24x0.c => serial_s3c.c} | 68 +++++++++++++--------
7 files changed, 58 insertions(+), 43 deletions(-)
rename drivers/serial/{serial_s3c24x0.c => serial_s3c.c} (68%)
diff --git a/arch/arm/boards/a9m2410/a9m2410.c b/arch/arm/boards/a9m2410/a9m2410.c
index 989dcf7..a66afb9 100644
--- a/arch/arm/boards/a9m2410/a9m2410.c
+++ b/arch/arm/boards/a9m2410/a9m2410.c
@@ -167,7 +167,7 @@ void __bare_init nand_boot(void)
static int a9m2410_console_init(void)
{
- add_generic_device("s3c24x0_serial", -1, NULL, UART1_BASE, UART1_SIZE,
+ add_generic_device("s3c_serial", -1, NULL, S3C_UART1_BASE, S3C_UART1_SIZE,
IORESOURCE_MEM, NULL);
return 0;
}
diff --git a/arch/arm/boards/a9m2440/a9m2440.c b/arch/arm/boards/a9m2440/a9m2440.c
index 1986efb..077d726 100644
--- a/arch/arm/boards/a9m2440/a9m2440.c
+++ b/arch/arm/boards/a9m2440/a9m2440.c
@@ -168,7 +168,7 @@ void __bare_init nand_boot(void)
static int a9m2440_console_init(void)
{
- add_generic_device("s3c24x0_serial", -1, NULL, UART1_BASE, UART1_SIZE,
+ add_generic_device("s3c_serial", -1, NULL, S3C_UART1_BASE, S3C_UART1_SIZE,
IORESOURCE_MEM, NULL);
return 0;
}
diff --git a/arch/arm/boards/mini2440/mini2440.c b/arch/arm/boards/mini2440/mini2440.c
index df3bcc6..9270c18 100644
--- a/arch/arm/boards/mini2440/mini2440.c
+++ b/arch/arm/boards/mini2440/mini2440.c
@@ -342,7 +342,7 @@ static int mini2440_console_init(void)
s3c_gpio_mode(GPH2_TXD0);
s3c_gpio_mode(GPH3_RXD0);
- add_generic_device("s3c24x0_serial", -1, NULL, UART1_BASE, UART1_SIZE,
+ add_generic_device("s3c_serial", -1, NULL, S3C_UART1_BASE, S3C_UART1_SIZE,
IORESOURCE_MEM, NULL);
return 0;
}
diff --git a/arch/arm/mach-samsung/include/mach/s3c-iomap.h b/arch/arm/mach-samsung/include/mach/s3c-iomap.h
index 9677803..7c45c53 100644
--- a/arch/arm/mach-samsung/include/mach/s3c-iomap.h
+++ b/arch/arm/mach-samsung/include/mach/s3c-iomap.h
@@ -28,7 +28,7 @@
#define S3C_CLOCK_POWER_BASE 0x4C000000
#define S3C2410_LCD_BASE 0x4D000000
#define S3C24X0_NAND_BASE 0x4E000000
-#define S3C24X0_UART_BASE 0x50000000
+#define S3C_UART_BASE 0x50000000
#define S3C_TIMER_BASE 0x51000000
#define S3C2410_USB_DEVICE_BASE 0x52000140
#define S3C_WATCHDOG_BASE 0x53000000
@@ -52,13 +52,12 @@
#endif
#define NFC_RAM_SIZE 4096
-/* internal UARTs (driver based) */
-#define UART1_BASE (S3C24X0_UART_BASE)
-#define UART1_SIZE 0x4000
-#define UART2_BASE (S3C24X0_UART_BASE + 0x4000)
-#define UART2_SIZE 0x4000
-#define UART3_BASE (S3C24X0_UART_BASE + 0x8000)
-#define UART3_SIZE 0x4000
+#define S3C_UART1_BASE (S3C_UART_BASE)
+#define S3C_UART1_SIZE 0x4000
+#define S3C_UART2_BASE (S3C_UART_BASE + 0x4000)
+#define S3C_UART2_SIZE 0x4000
+#define S3C_UART3_BASE (S3C_UART_BASE + 0x8000)
+#define S3C_UART3_SIZE 0x4000
/* CS configuration (direct access) */
#define BWSCON (S3C24X0_MEMCTL_BASE)
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index c2bee79..a986793 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -78,16 +78,16 @@ config DRIVER_SERIAL_PL010
help
Enable this to get support for AMBA PL010 based serial devices
-config DRIVER_SERIAL_S3C24X0
- bool "Samsung S3C24X0 serial driver"
+config DRIVER_SERIAL_S3C
+ bool "Samsung S3C serial driver"
depends on ARCH_S3C24xx
default y
help
- Say Y here if you want to use the CONS on a S3C24X0 CPU
+ Say Y here if you want to use the CONS on a Samsung S3C CPU
-config DRIVER_SERIAL_S3C24X0_AUTOSYNC
+config DRIVER_SERIAL_S3C_AUTOSYNC
bool "Enable auto flow"
- depends on DRIVER_SERIAL_S3C24X0
+ depends on DRIVER_SERIAL_S3C
help
Say Y here if you want to use the auto flow feature of this
UART. RTS and CTS will be handled by the hardware when enabled.
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index 411b8c5..1d1cff7 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -15,6 +15,6 @@ obj-$(CONFIG_DRIVER_SERIAL_MPC5XXX) += serial_mpc5xxx.o
obj-$(CONFIG_DRIVER_SERIAL_BLACKFIN) += serial_blackfin.o
obj-$(CONFIG_DRIVER_SERIAL_NS16550) += serial_ns16550.o
obj-$(CONFIG_DRIVER_SERIAL_PL010) += serial_pl010.o
-obj-$(CONFIG_DRIVER_SERIAL_S3C24X0) += serial_s3c24x0.o
+obj-$(CONFIG_DRIVER_SERIAL_S3C) += serial_s3c.o
obj-$(CONFIG_DRIVER_SERIAL_ALTERA) += serial_altera.o
obj-$(CONFIG_DRIVER_SERIAL_ALTERA_JTAG) += serial_altera_jtag.o
diff --git a/drivers/serial/serial_s3c24x0.c b/drivers/serial/serial_s3c.c
similarity index 68%
rename from drivers/serial/serial_s3c24x0.c
rename to drivers/serial/serial_s3c.c
index 0ca2319..7b31f67 100644
--- a/drivers/serial/serial_s3c24x0.c
+++ b/drivers/serial/serial_s3c.c
@@ -1,5 +1,5 @@
/*
- * (c) 2009 Juergen Beisert <j.beisert at saschahauer.de>
+ * (c) 2009...2011 Juergen Beisert <j.beisert at pengutronix.de>
*
* Based on code from:
* (c) 2004 Sascha Hauer <sascha at saschahauer.de>
@@ -41,20 +41,36 @@
#define URXH 0x24 /* receive */
#define UBRDIV 0x28 /* baudrate generator */
-static int s3c24x0_serial_setbaudrate(struct console_device *cdev, int baudrate)
+static unsigned s3c_get_arch_uart_input_clock(void __iomem *base)
+{
+ unsigned reg = readw(base + UCON);
+
+ switch (reg & 0xc00) {
+ case 0x000:
+ case 0x800:
+ return s3c_get_pclk();
+ case 0x400:
+ break; /* TODO UEXTCLK */
+ case 0xc00:
+ break; /* TODO FCLK/n */
+ }
+
+ return 0; /* not nice, but we can't emit an error message! */
+}
+
+static int s3c_serial_setbaudrate(struct console_device *cdev, int baudrate)
{
struct device_d *dev = cdev->dev;
void __iomem *base = dev->priv;
unsigned val;
- /* value is calculated so : PCLK / (16 * baudrate) -1 */
- val = s3c_get_pclk() / (16 * baudrate) - 1;
+ val = s3c_get_arch_uart_input_clock(base) / (16 * baudrate) - 1;
writew(val, base + UBRDIV);
return 0;
}
-static int s3c24x0_serial_init_port(struct console_device *cdev)
+static int s3c_serial_init_port(struct console_device *cdev)
{
struct device_d *dev = cdev->dev;
void __iomem *base = dev->priv;
@@ -71,7 +87,7 @@ static int s3c24x0_serial_init_port(struct console_device *cdev)
*/
writew(0x0245, base + UCON);
-#ifdef CONFIG_DRIVER_SERIAL_S3C24X0_AUTOSYNC
+#ifdef CONFIG_DRIVER_SERIAL_S3C_AUTOSYNC
writeb(0x10, base + UMCON); /* enable auto flow control */
#else
writeb(0x01, base + UMCON); /* RTS up */
@@ -80,7 +96,7 @@ static int s3c24x0_serial_init_port(struct console_device *cdev)
return 0;
}
-static void s3c24x0_serial_putc(struct console_device *cdev, char c)
+static void s3c_serial_putc(struct console_device *cdev, char c)
{
struct device_d *dev = cdev->dev;
void __iomem *base = dev->priv;
@@ -92,7 +108,7 @@ static void s3c24x0_serial_putc(struct console_device *cdev, char c)
writeb(c, base + UTXH);
}
-static int s3c24x0_serial_tstc(struct console_device *cdev)
+static int s3c_serial_tstc(struct console_device *cdev)
{
struct device_d *dev = cdev->dev;
void __iomem *base = dev->priv;
@@ -104,7 +120,7 @@ static int s3c24x0_serial_tstc(struct console_device *cdev)
return 0;
}
-static int s3c24x0_serial_getc(struct console_device *cdev)
+static int s3c_serial_getc(struct console_device *cdev)
{
struct device_d *dev = cdev->dev;
void __iomem *base = dev->priv;
@@ -116,7 +132,7 @@ static int s3c24x0_serial_getc(struct console_device *cdev)
return readb(base + URXH);
}
-static void s3c24x0_serial_flush(struct console_device *cdev)
+static void s3c_serial_flush(struct console_device *cdev)
{
struct device_d *dev = cdev->dev;
void __iomem *base = dev->priv;
@@ -125,7 +141,7 @@ static void s3c24x0_serial_flush(struct console_device *cdev)
;
}
-static int s3c24x0_serial_probe(struct device_d *dev)
+static int s3c_serial_probe(struct device_d *dev)
{
struct console_device *cdev;
@@ -134,13 +150,13 @@ static int s3c24x0_serial_probe(struct device_d *dev)
dev->priv = dev_request_mem_region(dev, 0);
cdev->dev = dev;
cdev->f_caps = CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR;
- cdev->tstc = s3c24x0_serial_tstc;
- cdev->putc = s3c24x0_serial_putc;
- cdev->getc = s3c24x0_serial_getc;
- cdev->flush = s3c24x0_serial_flush;
- cdev->setbrg = s3c24x0_serial_setbaudrate;
+ cdev->tstc = s3c_serial_tstc;
+ cdev->putc = s3c_serial_putc;
+ cdev->getc = s3c_serial_getc;
+ cdev->flush = s3c_serial_flush;
+ cdev->setbrg = s3c_serial_setbaudrate;
- s3c24x0_serial_init_port(cdev);
+ s3c_serial_init_port(cdev);
/* Enable UART */
console_register(cdev);
@@ -148,25 +164,25 @@ static int s3c24x0_serial_probe(struct device_d *dev)
return 0;
}
-static void s3c24x0_serial_remove(struct device_d *dev)
+static void s3c_serial_remove(struct device_d *dev)
{
struct console_device *cdev = dev->type_data;
- s3c24x0_serial_flush(cdev);
+ s3c_serial_flush(cdev);
free(cdev);
dev->type_data = NULL;
}
-static struct driver_d s3c24x0_serial_driver = {
- .name = "s3c24x0_serial",
- .probe = s3c24x0_serial_probe,
- .remove = s3c24x0_serial_remove,
+static struct driver_d s3c_serial_driver = {
+ .name = "s3c_serial",
+ .probe = s3c_serial_probe,
+ .remove = s3c_serial_remove,
};
-static int s3c24x0_serial_init(void)
+static int s3c_serial_init(void)
{
- register_driver(&s3c24x0_serial_driver);
+ register_driver(&s3c_serial_driver);
return 0;
}
-console_initcall(s3c24x0_serial_init);
+console_initcall(s3c_serial_init);
--
1.7.7.1
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