From 305554768011707f33f437b96f999f812ba2a7e4 Mon Sep 17 00:00:00 2001
From: Ben Dooks <ben-linux@fluff.org>
Date: Tue, 21 Oct 2008 14:06:36 +0100
Subject: [ARM] CPUFREQ: S3C24XX serial CPU frequency scaling support.

Add support for CPU frequency scalling to the S3C24XX serial
driver.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---
 drivers/serial/samsung.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++++
 drivers/serial/samsung.h |  6 +++
 2 files changed, 102 insertions(+)

(limited to 'drivers/serial')

diff --git a/drivers/serial/samsung.c b/drivers/serial/samsung.c
index 1e219d3d0352..ebeda832c8a3 100644
--- a/drivers/serial/samsung.c
+++ b/drivers/serial/samsung.c
@@ -42,6 +42,7 @@
 #include <linux/serial.h>
 #include <linux/delay.h>
 #include <linux/clk.h>
+#include <linux/cpufreq.h>
 
 #include <asm/irq.h>
 
@@ -452,6 +453,8 @@ static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
 {
 	struct s3c24xx_uart_port *ourport = to_ourport(port);
 
+	ourport->pm_level = level;
+
 	switch (level) {
 	case 3:
 		if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL)
@@ -661,6 +664,7 @@ static void s3c24xx_serial_set_termios(struct uart_port *port,
 
 		ourport->clksrc = clksrc;
 		ourport->baudclk = clk;
+		ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0;
 	}
 
 	switch (termios->c_cflag & CSIZE) {
@@ -890,6 +894,93 @@ static inline int s3c24xx_serial_resetport(struct uart_port *port,
 	return (info->reset_port)(port, cfg);
 }
 
+
+#ifdef CONFIG_CPU_FREQ
+
+static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb,
+					     unsigned long val, void *data)
+{
+	struct s3c24xx_uart_port *port;
+	struct uart_port *uport;
+
+	port = container_of(nb, struct s3c24xx_uart_port, freq_transition);
+	uport = &port->port;
+
+	/* check to see if port is enabled */
+
+	if (port->pm_level != 0)
+		return 0;
+
+	/* try and work out if the baudrate is changing, we can detect
+	 * a change in rate, but we do not have support for detecting
+	 * a disturbance in the clock-rate over the change.
+	 */
+
+	if (IS_ERR(port->clk))
+		goto exit;
+
+	if (port->baudclk_rate == clk_get_rate(port->clk))
+		goto exit;
+
+	if (val == CPUFREQ_PRECHANGE) {
+		/* we should really shut the port down whilst the
+		 * frequency change is in progress. */
+
+	} else if (val == CPUFREQ_POSTCHANGE) {
+		struct ktermios *termios;
+		struct tty_struct *tty;
+
+		if (uport->info == NULL) {
+			printk(KERN_WARNING "%s: info NULL\n", __func__);
+			goto exit;
+		}
+
+		tty = uport->info->port.tty;
+
+		if (tty == NULL) {
+			printk(KERN_WARNING "%s: tty is NULL\n", __func__);
+			goto exit;
+		}
+
+		termios = tty->termios;
+
+		if (termios == NULL) {
+			printk(KERN_WARNING "%s: no termios?\n", __func__);
+			goto exit;
+		}
+
+		s3c24xx_serial_set_termios(uport, termios, NULL);
+	}
+
+ exit:
+	return 0;
+}
+
+static inline int s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
+{
+	port->freq_transition.notifier_call = s3c24xx_serial_cpufreq_transition;
+
+	return cpufreq_register_notifier(&port->freq_transition,
+					 CPUFREQ_TRANSITION_NOTIFIER);
+}
+
+static inline void s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
+{
+	cpufreq_unregister_notifier(&port->freq_transition,
+				    CPUFREQ_TRANSITION_NOTIFIER);
+}
+
+#else
+static inline int s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
+{
+	return 0;
+}
+
+static inline void s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
+{
+}
+#endif
+
 /* s3c24xx_serial_init_port
  *
  * initialise a single serial port from the platform device given
@@ -1002,6 +1093,10 @@ int s3c24xx_serial_probe(struct platform_device *dev,
 	if (ret < 0)
 		printk(KERN_ERR "%s: failed to add clksrc attr.\n", __func__);
 
+	ret = s3c24xx_serial_cpufreq_register(ourport);
+	if (ret < 0)
+		dev_err(&dev->dev, "failed to add cpufreq notifier\n");
+
 	return 0;
 
  probe_err:
@@ -1015,6 +1110,7 @@ int s3c24xx_serial_remove(struct platform_device *dev)
 	struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
 
 	if (port) {
+		s3c24xx_serial_cpufreq_deregister(to_ourport(port));
 		device_remove_file(&dev->dev, &dev_attr_clock_source);
 		uart_remove_one_port(&s3c24xx_uart_drv, port);
 	}
diff --git a/drivers/serial/samsung.h b/drivers/serial/samsung.h
index 5c92ebbe7d9e..be263423205d 100644
--- a/drivers/serial/samsung.h
+++ b/drivers/serial/samsung.h
@@ -33,12 +33,18 @@ struct s3c24xx_uart_info {
 struct s3c24xx_uart_port {
 	unsigned char			rx_claimed;
 	unsigned char			tx_claimed;
+	unsigned int			pm_level;
+	unsigned long			baudclk_rate;
 
 	struct s3c24xx_uart_info	*info;
 	struct s3c24xx_uart_clksrc	*clksrc;
 	struct clk			*clk;
 	struct clk			*baudclk;
 	struct uart_port		port;
+
+#ifdef CONFIG_CPU_FREQ
+	struct notifier_block		freq_transition;
+#endif
 };
 
 /* conversion functions */
-- 
cgit v1.2.3


From 1d4bab082474d539f900e896880aa2135e0f5393 Mon Sep 17 00:00:00 2001
From: Sandeep Patil <sandeep.patil@azingo.com>
Date: Tue, 21 Oct 2008 14:06:30 +0100
Subject: [ARM] S3C24A0: Serial port definitions and driver support.

Add serial support for S3C24A0, based on current S3C2410
UART driver. It adds necessary new defines in regs-serial.h
for S3C24A0 and the code to support this device in
drivers/serial/s3c24a0.c

Signed-off-by: Sandeep Patil <sandeep.patil@azingo.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---
 arch/arm/plat-s3c/include/plat/regs-serial.h |   8 ++
 drivers/serial/Kconfig                       |   7 +-
 drivers/serial/Makefile                      |   1 +
 drivers/serial/s3c24a0.c                     | 118 +++++++++++++++++++++++++++
 drivers/serial/samsung.c                     |   2 +-
 5 files changed, 134 insertions(+), 2 deletions(-)
 create mode 100644 drivers/serial/s3c24a0.c

(limited to 'drivers/serial')

diff --git a/arch/arm/plat-s3c/include/plat/regs-serial.h b/arch/arm/plat-s3c/include/plat/regs-serial.h
index a0daa647b92c..18ba31c7174c 100644
--- a/arch/arm/plat-s3c/include/plat/regs-serial.h
+++ b/arch/arm/plat-s3c/include/plat/regs-serial.h
@@ -149,6 +149,14 @@
 #define S3C2410_UFSTAT_RXMASK	  (15<<0)
 #define S3C2410_UFSTAT_RXSHIFT	  (0)
 
+/* UFSTAT S3C24A0 */
+#define S3C24A0_UFSTAT_TXFULL	  (1 << 14)
+#define S3C24A0_UFSTAT_RXFULL	  (1 << 6)
+#define S3C24A0_UFSTAT_TXMASK	  (63 << 8)
+#define S3C24A0_UFSTAT_TXSHIFT	  (8)
+#define S3C24A0_UFSTAT_RXMASK	  (63)
+#define S3C24A0_UFSTAT_RXSHIFT	  (0)
+
 /* UFSTAT S3C2443 same as S3C2440 */
 #define S3C2440_UFSTAT_TXFULL	  (1<<14)
 #define S3C2440_UFSTAT_RXFULL	  (1<<6)
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 579d63a81aa2..f71a2e8a5f60 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -508,7 +508,12 @@ config SERIAL_S3C2440
 	help
 	  Serial port support for the Samsung S3C2440 and S3C2442 SoC
 
-
+config SERIAL_S3C24A0
+	tristate "Samsung S3C24A0 Serial port support"
+	depends on SERIAL_SAMSUNG && CPU_S3C24A0
+	default y if CPU_S3C24A0
+	help
+	  Serial port support for the Samsung S3C24A0 SoC
 
 config SERIAL_DZ
 	bool "DECstation DZ serial driver"
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index 0c17c8ddb19d..7769aece54ca 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_SERIAL_S3C2400) += s3c2400.o
 obj-$(CONFIG_SERIAL_S3C2410) += s3c2410.o
 obj-$(CONFIG_SERIAL_S3C2412) += s3c2412.o
 obj-$(CONFIG_SERIAL_S3C2440) += s3c2440.o
+obj-$(CONFIG_SERIAL_S3C24A0) += s3c24a0.o
 obj-$(CONFIG_SERIAL_IP22_ZILOG) += ip22zilog.o
 obj-$(CONFIG_SERIAL_MUX) += mux.o
 obj-$(CONFIG_SERIAL_68328) += 68328serial.o
diff --git a/drivers/serial/s3c24a0.c b/drivers/serial/s3c24a0.c
new file mode 100644
index 000000000000..ebf2fd3c8f7d
--- /dev/null
+++ b/drivers/serial/s3c24a0.c
@@ -0,0 +1,118 @@
+/* linux/drivers/serial/s3c24a0.c
+ *
+ * Driver for Samsung S3C24A0 SoC onboard UARTs.
+ *
+ * Based on drivers/serial/s3c2410.c
+ *
+ * Author: Sandeep Patil <sandeep.patil@azingo.com>
+ *
+ * Ben Dooks, Copyright (c) 2003-2005,2008 Simtec Electronics
+ *	http://armlinux.simtec.co.uk/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+
+#include <mach/hardware.h>
+
+#include <plat/regs-serial.h>
+#include <mach/regs-gpio.h>
+
+#include "samsung.h"
+
+static int s3c24a0_serial_setsource(struct uart_port *port,
+				    struct s3c24xx_uart_clksrc *clk)
+{
+	unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+	if (strcmp(clk->name, "uclk") == 0)
+		ucon |= S3C2410_UCON_UCLK;
+	else
+		ucon &= ~S3C2410_UCON_UCLK;
+
+	wr_regl(port, S3C2410_UCON, ucon);
+	return 0;
+}
+
+static int s3c24a0_serial_getsource(struct uart_port *port,
+				    struct s3c24xx_uart_clksrc *clk)
+{
+	unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+	clk->divisor = 1;
+	clk->name = (ucon & S3C2410_UCON_UCLK) ? "uclk" : "pclk";
+
+	return 0;
+}
+
+static int s3c24a0_serial_resetport(struct uart_port *port,
+				    struct s3c2410_uartcfg *cfg)
+{
+	dbg("s3c24a0_serial_resetport: port=%p (%08lx), cfg=%p\n",
+	    port, port->mapbase, cfg);
+
+	wr_regl(port, S3C2410_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 s3c24a0_uart_inf = {
+	.name		= "Samsung S3C24A0 UART",
+	.type		= PORT_S3C2410,
+	.fifosize	= 16,
+	.rx_fifomask	= S3C24A0_UFSTAT_RXMASK,
+	.rx_fifoshift	= S3C24A0_UFSTAT_RXSHIFT,
+	.rx_fifofull	= S3C24A0_UFSTAT_RXFULL,
+	.tx_fifofull	= S3C24A0_UFSTAT_TXFULL,
+	.tx_fifomask	= S3C24A0_UFSTAT_TXMASK,
+	.tx_fifoshift	= S3C24A0_UFSTAT_TXSHIFT,
+	.get_clksrc	= s3c24a0_serial_getsource,
+	.set_clksrc	= s3c24a0_serial_setsource,
+	.reset_port	= s3c24a0_serial_resetport,
+};
+
+static int s3c24a0_serial_probe(struct platform_device *dev)
+{
+	return s3c24xx_serial_probe(dev, &s3c24a0_uart_inf);
+}
+
+static struct platform_driver s3c24a0_serial_drv = {
+	.probe		= s3c24a0_serial_probe,
+	.remove		= s3c24xx_serial_remove,
+	.driver		= {
+		.name	= "s3c24a0-uart",
+		.owner	= THIS_MODULE,
+	},
+};
+
+s3c24xx_console_init(&s3c24a0_serial_drv, &s3c24a0_uart_inf);
+
+static int __init s3c24a0_serial_init(void)
+{
+	return s3c24xx_serial_init(&s3c24a0_serial_drv, &s3c24a0_uart_inf);
+}
+
+static void __exit s3c24a0_serial_exit(void)
+{
+	platform_driver_unregister(&s3c24a0_serial_drv);
+}
+
+module_init(s3c24a0_serial_init);
+module_exit(s3c24a0_serial_exit);
+
diff --git a/drivers/serial/samsung.c b/drivers/serial/samsung.c
index ebeda832c8a3..bb8b57aae3af 100644
--- a/drivers/serial/samsung.c
+++ b/drivers/serial/samsung.c
@@ -61,7 +61,7 @@
 
 /* we can support 3 uarts, but not always use them */
 
-#ifdef CONFIG_CPU_S3C2400
+#if defined(CONFIG_CPU_S3C2400) || defined(CONFIG_CPU_S3C24A0)
 #define NR_PORTS (2)
 #else
 #define NR_PORTS (3)
-- 
cgit v1.2.3


From b690ace50be7d10d77cb7a6d5ef1bd9de649852f Mon Sep 17 00:00:00 2001
From: Ben Dooks <ben-linux@fluff.org>
Date: Tue, 21 Oct 2008 14:07:03 +0100
Subject: [ARM] S3C6400: serial support for S3C6400 and S3C6410 SoCs

Add support to the Samsung serial driver for the S3C6400
and S3C6410 serial ports.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---
 arch/arm/mach-s3c2410/include/mach/map.h     |   2 +
 arch/arm/mach-s3c24a0/include/mach/map.h     |   2 +
 arch/arm/plat-s3c/include/plat/regs-serial.h |   6 ++
 drivers/serial/Kconfig                       |  10 +-
 drivers/serial/Makefile                      |   1 +
 drivers/serial/s3c6400.c                     | 151 +++++++++++++++++++++++++++
 drivers/serial/samsung.c                     |   8 +-
 include/linux/serial_core.h                  |   2 +
 8 files changed, 178 insertions(+), 4 deletions(-)
 create mode 100644 drivers/serial/s3c6400.c

(limited to 'drivers/serial')

diff --git a/arch/arm/mach-s3c2410/include/mach/map.h b/arch/arm/mach-s3c2410/include/mach/map.h
index 6b30361a0805..918e3463297f 100644
--- a/arch/arm/mach-s3c2410/include/mach/map.h
+++ b/arch/arm/mach-s3c2410/include/mach/map.h
@@ -101,4 +101,6 @@
 #define S3C24XX_PA_SDI      S3C2410_PA_SDI
 #define S3C24XX_PA_NAND	    S3C2410_PA_NAND
 
+#define S3C_PA_UART	    S3C24XX_PA_UART
+
 #endif /* __ASM_ARCH_MAP_H */
diff --git a/arch/arm/mach-s3c24a0/include/mach/map.h b/arch/arm/mach-s3c24a0/include/mach/map.h
index 2ce1839de4ee..6667355a47a1 100644
--- a/arch/arm/mach-s3c24a0/include/mach/map.h
+++ b/arch/arm/mach-s3c24a0/include/mach/map.h
@@ -80,4 +80,6 @@
 #define S3C24XX_PA_SDI		S3C24A0_PA_SDI
 #define S3C24XX_PA_NAND		S3C24A0_PA_NAND
 
+#define S3C_PA_UART		S3C24A0_PA_UART
+
 #endif /* __ASM_ARCH_24A0_MAP_H */
diff --git a/arch/arm/plat-s3c/include/plat/regs-serial.h b/arch/arm/plat-s3c/include/plat/regs-serial.h
index 18ba31c7174c..3ca28585cf80 100644
--- a/arch/arm/plat-s3c/include/plat/regs-serial.h
+++ b/arch/arm/plat-s3c/include/plat/regs-serial.h
@@ -77,6 +77,12 @@
 #define S3C2440_UCON_FCLK	  (3<<10)
 #define S3C2443_UCON_EPLL	  (3<<10)
 
+#define S3C6400_UCON_CLKMASK	(3<<10)
+#define S3C6400_UCON_PCLK	(0<<10)
+#define S3C6400_UCON_PCLK2	(2<<10)
+#define S3C6400_UCON_UCLK0	(1<<10)
+#define S3C6400_UCON_UCLK1	(3<<10)
+
 #define S3C2440_UCON2_FCLK_EN	  (1<<15)
 #define S3C2440_UCON0_DIVMASK	  (15 << 12)
 #define S3C2440_UCON1_DIVMASK	  (15 << 12)
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index f71a2e8a5f60..e4ae499e587e 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -447,7 +447,7 @@ config SERIAL_CLPS711X_CONSOLE
 
 config SERIAL_SAMSUNG
 	tristate "Samsung SoC serial support"
-	depends on ARM && PLAT_S3C24XX
+	depends on ARM && PLAT_S3C
 	select SERIAL_CORE
 	help
 	  Support for the on-chip UARTs on the Samsung S3C24XX series CPUs,
@@ -515,6 +515,14 @@ config SERIAL_S3C24A0
 	help
 	  Serial port support for the Samsung S3C24A0 SoC
 
+config SERIAL_S3C6400
+	tristate "Samsung S3C6400/S3C6410 Serial port support"
+	depends on SERIAL_SAMSUNG && (CPU_S3C600 || CPU_S3C6410)
+	default y
+	help
+	  Serial port support for the Samsung S3C6400 and S3C6410
+	  SoCs
+
 config SERIAL_DZ
 	bool "DECstation DZ serial driver"
 	depends on MACH_DECSTATION && 32BIT
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index 7769aece54ca..dfe775ac45b2 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -42,6 +42,7 @@ obj-$(CONFIG_SERIAL_S3C2410) += s3c2410.o
 obj-$(CONFIG_SERIAL_S3C2412) += s3c2412.o
 obj-$(CONFIG_SERIAL_S3C2440) += s3c2440.o
 obj-$(CONFIG_SERIAL_S3C24A0) += s3c24a0.o
+obj-$(CONFIG_SERIAL_S3C6400) += s3c6400.o
 obj-$(CONFIG_SERIAL_IP22_ZILOG) += ip22zilog.o
 obj-$(CONFIG_SERIAL_MUX) += mux.o
 obj-$(CONFIG_SERIAL_68328) += 68328serial.o
diff --git a/drivers/serial/s3c6400.c b/drivers/serial/s3c6400.c
new file mode 100644
index 000000000000..06936d13393f
--- /dev/null
+++ b/drivers/serial/s3c6400.c
@@ -0,0 +1,151 @@
+/* linux/drivers/serial/s3c6400.c
+ *
+ * Driver for Samsung S3C6400 and S3C6410 SoC onboard UARTs.
+ *
+ * Copyright 2008 Openmoko,  Inc.
+ * Copyright 2008 Simtec Electronics
+ *	Ben Dooks <ben@simtec.co.uk>
+ *	http://armlinux.simtec.co.uk/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+
+#include <asm/irq.h>
+#include <mach/hardware.h>
+
+#include <plat/regs-serial.h>
+
+#include "samsung.h"
+
+static int s3c6400_serial_setsource(struct uart_port *port,
+				    struct s3c24xx_uart_clksrc *clk)
+{
+	unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+	if (strcmp(clk->name, "uclk0") == 0) {
+		ucon &= ~S3C6400_UCON_CLKMASK;
+		ucon |= S3C6400_UCON_UCLK0;
+	} else if (strcmp(clk->name, "uclk1") == 0)
+		ucon |= S3C6400_UCON_UCLK1;
+	else if (strcmp(clk->name, "pclk") == 0) {
+		/* See notes about transitioning from UCLK to PCLK */
+		ucon &= ~S3C6400_UCON_UCLK0;
+	} else {
+		printk(KERN_ERR "unknown clock source %s\n", clk->name);
+		return -EINVAL;
+	}
+
+	wr_regl(port, S3C2410_UCON, ucon);
+	return 0;
+}
+
+
+static int s3c6400_serial_getsource(struct uart_port *port,
+				    struct s3c24xx_uart_clksrc *clk)
+{
+	u32 ucon = rd_regl(port, S3C2410_UCON);
+
+	clk->divisor = 1;
+
+	switch (ucon & S3C6400_UCON_CLKMASK) {
+	case S3C6400_UCON_UCLK0:
+		clk->name = "uclk0";
+		break;
+
+	case S3C6400_UCON_UCLK1:
+		clk->name = "uclk1";
+		break;
+
+	case S3C6400_UCON_PCLK:
+	case S3C6400_UCON_PCLK2:
+		clk->name = "pclk";
+		break;
+	}
+
+	return 0;
+}
+
+static int s3c6400_serial_resetport(struct uart_port *port,
+				    struct s3c2410_uartcfg *cfg)
+{
+	unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+	dbg("s3c6400_serial_resetport: port=%p (%08lx), cfg=%p\n",
+	    port, port->mapbase, cfg);
+
+	/* ensure we don't change the clock settings... */
+
+	ucon &= S3C6400_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 s3c6400_uart_inf = {
+	.name		= "Samsung S3C6400 UART",
+	.type		= PORT_S3C6400,
+	.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	= s3c6400_serial_getsource,
+	.set_clksrc	= s3c6400_serial_setsource,
+	.reset_port	= s3c6400_serial_resetport,
+};
+
+/* device management */
+
+static int s3c6400_serial_probe(struct platform_device *dev)
+{
+	dbg("s3c6400_serial_probe: dev=%p\n", dev);
+	return s3c24xx_serial_probe(dev, &s3c6400_uart_inf);
+}
+
+static struct platform_driver s3c6400_serial_drv = {
+	.probe		= s3c6400_serial_probe,
+	.remove		= s3c24xx_serial_remove,
+	.driver		= {
+		.name	= "s3c6400-uart",
+		.owner	= THIS_MODULE,
+	},
+};
+
+s3c24xx_console_init(&s3c6400_serial_drv, &s3c6400_uart_inf);
+
+static int __init s3c6400_serial_init(void)
+{
+	return s3c24xx_serial_init(&s3c6400_serial_drv, &s3c6400_uart_inf);
+}
+
+static void __exit s3c6400_serial_exit(void)
+{
+	platform_driver_unregister(&s3c6400_serial_drv);
+}
+
+module_init(s3c6400_serial_init);
+module_exit(s3c6400_serial_exit);
+
+MODULE_DESCRIPTION("Samsung S3C6400,S3C6410 SoC Serial port driver");
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:s3c6400-uart");
diff --git a/drivers/serial/samsung.c b/drivers/serial/samsung.c
index bb8b57aae3af..44fc38afa228 100644
--- a/drivers/serial/samsung.c
+++ b/drivers/serial/samsung.c
@@ -47,9 +47,9 @@
 #include <asm/irq.h>
 
 #include <mach/hardware.h>
+#include <mach/map.h>
 
 #include <plat/regs-serial.h>
-#include <mach/regs-gpio.h>
 
 #include "samsung.h"
 
@@ -756,6 +756,8 @@ static const char *s3c24xx_serial_type(struct uart_port *port)
 		return "S3C2440";
 	case PORT_S3C2412:
 		return "S3C2412";
+	case PORT_S3C6400:
+		return "S3C6400/10";
 	default:
 		return NULL;
 	}
@@ -1034,8 +1036,8 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
 
 	dbg("resource %p (%lx..%lx)\n", res, res->start, res->end);
 
-	port->mapbase	= res->start;
-	port->membase	= S3C24XX_VA_UART + (res->start - S3C24XX_PA_UART);
+	port->mapbase = res->start;
+	port->membase = S3C_VA_UART + res->start - (S3C_PA_UART & 0xfff00000);
 	ret = platform_get_irq(platdev, 0);
 	if (ret < 0)
 		port->irq = 0;
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 4e4f1277f3bf..feb3b939ec4b 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -158,6 +158,8 @@
 /* SH-SCI */
 #define PORT_SCIFA	83
 
+#define PORT_S3C6400	84
+
 #ifdef __KERNEL__
 
 #include <linux/compiler.h>
-- 
cgit v1.2.3


From b73c289cc90138e9f78d487434df0f8eeb2daf9b Mon Sep 17 00:00:00 2001
From: Ben Dooks <ben-linux@fluff.org>
Date: Tue, 21 Oct 2008 14:07:04 +0100
Subject: [ARM] S3C: Update serial driver IRQ handling

The S3C64XX code changes the order of the serial
interrupts, so change the registration process to
pickup the extra IRQ resources.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---
 drivers/serial/samsung.c | 45 ++++++++++++++++++++++++++-------------------
 drivers/serial/samsung.h |  3 +++
 2 files changed, 29 insertions(+), 19 deletions(-)

(limited to 'drivers/serial')

diff --git a/drivers/serial/samsung.c b/drivers/serial/samsung.c
index 44fc38afa228..ba2e8685f9f5 100644
--- a/drivers/serial/samsung.c
+++ b/drivers/serial/samsung.c
@@ -67,11 +67,6 @@
 #define NR_PORTS (3)
 #endif
 
-/* port irq numbers */
-
-#define TX_IRQ(port) ((port)->irq + 1)
-#define RX_IRQ(port) ((port)->irq)
-
 /* macros to change one thing to another */
 
 #define tx_enabled(port) ((port)->unused[0])
@@ -137,8 +132,10 @@ static void s3c24xx_serial_rx_disable(struct uart_port *port)
 
 static void s3c24xx_serial_stop_tx(struct uart_port *port)
 {
+	struct s3c24xx_uart_port *ourport = to_ourport(port);
+
 	if (tx_enabled(port)) {
-		disable_irq(TX_IRQ(port));
+		disable_irq(ourport->tx_irq);
 		tx_enabled(port) = 0;
 		if (port->flags & UPF_CONS_FLOW)
 			s3c24xx_serial_rx_enable(port);
@@ -147,11 +144,13 @@ static void s3c24xx_serial_stop_tx(struct uart_port *port)
 
 static void s3c24xx_serial_start_tx(struct uart_port *port)
 {
+	struct s3c24xx_uart_port *ourport = to_ourport(port);
+
 	if (!tx_enabled(port)) {
 		if (port->flags & UPF_CONS_FLOW)
 			s3c24xx_serial_rx_disable(port);
 
-		enable_irq(TX_IRQ(port));
+		enable_irq(ourport->tx_irq);
 		tx_enabled(port) = 1;
 	}
 }
@@ -159,9 +158,11 @@ static void s3c24xx_serial_start_tx(struct uart_port *port)
 
 static void s3c24xx_serial_stop_rx(struct uart_port *port)
 {
+	struct s3c24xx_uart_port *ourport = to_ourport(port);
+
 	if (rx_enabled(port)) {
 		dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
-		disable_irq(RX_IRQ(port));
+		disable_irq(ourport->rx_irq);
 		rx_enabled(port) = 0;
 	}
 }
@@ -385,13 +386,13 @@ static void s3c24xx_serial_shutdown(struct uart_port *port)
 	struct s3c24xx_uart_port *ourport = to_ourport(port);
 
 	if (ourport->tx_claimed) {
-		free_irq(TX_IRQ(port), ourport);
+		free_irq(ourport->tx_irq, ourport);
 		tx_enabled(port) = 0;
 		ourport->tx_claimed = 0;
 	}
 
 	if (ourport->rx_claimed) {
-		free_irq(RX_IRQ(port), ourport);
+		free_irq(ourport->rx_irq, ourport);
 		ourport->rx_claimed = 0;
 		rx_enabled(port) = 0;
 	}
@@ -408,12 +409,11 @@ static int s3c24xx_serial_startup(struct uart_port *port)
 
 	rx_enabled(port) = 1;
 
-	ret = request_irq(RX_IRQ(port),
-			  s3c24xx_serial_rx_chars, 0,
+	ret = request_irq(ourport->rx_irq, s3c24xx_serial_rx_chars, 0,
 			  s3c24xx_serial_portname(port), ourport);
 
 	if (ret != 0) {
-		printk(KERN_ERR "cannot get irq %d\n", RX_IRQ(port));
+		printk(KERN_ERR "cannot get irq %d\n", ourport->rx_irq);
 		return ret;
 	}
 
@@ -423,12 +423,11 @@ static int s3c24xx_serial_startup(struct uart_port *port)
 
 	tx_enabled(port) = 1;
 
-	ret = request_irq(TX_IRQ(port),
-			  s3c24xx_serial_tx_chars, 0,
+	ret = request_irq(ourport->tx_irq, s3c24xx_serial_tx_chars, 0,
 			  s3c24xx_serial_portname(port), ourport);
 
 	if (ret) {
-		printk(KERN_ERR "cannot get irq %d\n", TX_IRQ(port));
+		printk(KERN_ERR "cannot get irq %d\n", ourport->tx_irq);
 		goto err;
 	}
 
@@ -1041,13 +1040,21 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
 	ret = platform_get_irq(platdev, 0);
 	if (ret < 0)
 		port->irq = 0;
-	else
+	else {
 		port->irq = ret;
+		ourport->rx_irq = ret;
+		ourport->tx_irq = ret + 1;
+	}
+	
+	ret = platform_get_irq(platdev, 1);
+	if (ret > 0)
+		ourport->tx_irq = ret;
 
 	ourport->clk	= clk_get(&platdev->dev, "uart");
 
-	dbg("port: map=%08x, mem=%08x, irq=%d, clock=%ld\n",
-	    port->mapbase, port->membase, port->irq, port->uartclk);
+	dbg("port: map=%08x, mem=%08x, irq=%d (%d,%d), clock=%ld\n",
+	    port->mapbase, port->membase, port->irq,
+	    ourport->rx_irq, ourport->tx_irq, port->uartclk);
 
 	/* reset the fifos (and setup the uart) */
 	s3c24xx_serial_resetport(port, cfg);
diff --git a/drivers/serial/samsung.h b/drivers/serial/samsung.h
index be263423205d..571d6b90d206 100644
--- a/drivers/serial/samsung.h
+++ b/drivers/serial/samsung.h
@@ -36,6 +36,9 @@ struct s3c24xx_uart_port {
 	unsigned int			pm_level;
 	unsigned long			baudclk_rate;
 
+	unsigned int			rx_irq;
+	unsigned int			tx_irq;
+
 	struct s3c24xx_uart_info	*info;
 	struct s3c24xx_uart_clksrc	*clksrc;
 	struct clk			*clk;
-- 
cgit v1.2.3


From 03d5e77bb6538d3f253e04ddf0dda9b848552589 Mon Sep 17 00:00:00 2001
From: Ben Dooks <ben-linux@fluff.org>
Date: Mon, 3 Nov 2008 09:21:23 +0000
Subject: [ARM] S3C: Update number of serial ports

Update the serial driver to handle the 4 ports of the
S3C2443 and S364XX series.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---
 drivers/serial/Kconfig   | 10 ++++++++++
 drivers/serial/samsung.c | 30 ++++++++++++++++++------------
 2 files changed, 28 insertions(+), 12 deletions(-)

(limited to 'drivers/serial')

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index e4ae499e587e..b695ab3142d8 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -455,6 +455,16 @@ config SERIAL_SAMSUNG
 	  provide all of these ports, depending on how the serial port
 	  pins are configured.
 
+config SERIAL_SAMSUNG_UARTS
+	int
+	depends on SERIAL_SAMSUNG
+	default 2 if ARCH_S3C2400
+	default 4 if ARCH_S3C64XX || CPU_S3C2443
+	default 3
+	help
+	  Select the number of available UART ports for the Samsung S3C
+	  serial driver
+	
 config SERIAL_SAMSUNG_DEBUG
 	bool "Samsung SoC serial debug"
 	depends on SERIAL_SAMSUNG && DEBUG_LL
diff --git a/drivers/serial/samsung.c b/drivers/serial/samsung.c
index ba2e8685f9f5..ec873af26101 100644
--- a/drivers/serial/samsung.c
+++ b/drivers/serial/samsung.c
@@ -59,14 +59,6 @@
 #define S3C24XX_SERIAL_MAJOR	204
 #define S3C24XX_SERIAL_MINOR	64
 
-/* we can support 3 uarts, but not always use them */
-
-#if defined(CONFIG_CPU_S3C2400) || defined(CONFIG_CPU_S3C24A0)
-#define NR_PORTS (2)
-#else
-#define NR_PORTS (3)
-#endif
-
 /* macros to change one thing to another */
 
 #define tx_enabled(port) ((port)->unused[0])
@@ -839,7 +831,7 @@ static struct uart_driver s3c24xx_uart_drv = {
 	.minor		= S3C24XX_SERIAL_MINOR,
 };
 
-static struct s3c24xx_uart_port s3c24xx_serial_ports[NR_PORTS] = {
+static struct s3c24xx_uart_port s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = {
 	[0] = {
 		.port = {
 			.lock		= __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[0].port.lock),
@@ -864,7 +856,7 @@ static struct s3c24xx_uart_port s3c24xx_serial_ports[NR_PORTS] = {
 			.line		= 1,
 		}
 	},
-#if NR_PORTS > 2
+#if CONFIG_SERIAL_SAMSUNG_UARTS > 2
 
 	[2] = {
 		.port = {
@@ -877,6 +869,20 @@ static struct s3c24xx_uart_port s3c24xx_serial_ports[NR_PORTS] = {
 			.flags		= UPF_BOOT_AUTOCONF,
 			.line		= 2,
 		}
+	},
+#endif
+#if CONFIG_SERIAL_SAMSUNG_UARTS > 3
+	[3] = {
+		.port = {
+			.lock		= __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[3].port.lock),
+			.iotype		= UPIO_MEM,
+			.irq		= IRQ_S3CUART_RX3,
+			.uartclk	= 0,
+			.fifosize	= 16,
+			.ops		= &s3c24xx_serial_ops,
+			.flags		= UPF_BOOT_AUTOCONF,
+			.line		= 3,
+		}
 	}
 #endif
 };
@@ -1324,7 +1330,7 @@ static int s3c24xx_serial_init_ports(struct s3c24xx_uart_info *info)
 
 	platdev_ptr = s3c24xx_uart_devs;
 
-	for (i = 0; i < NR_PORTS; i++, ptr++, platdev_ptr++) {
+	for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++, ptr++, platdev_ptr++) {
 		s3c24xx_serial_init_port(ptr, info, *platdev_ptr);
 	}
 
@@ -1345,7 +1351,7 @@ s3c24xx_serial_console_setup(struct console *co, char *options)
 
 	/* is this a valid port */
 
-	if (co->index == -1 || co->index >= NR_PORTS)
+	if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS)
 		co->index = 0;
 
 	port = &s3c24xx_serial_ports[co->index].port;
-- 
cgit v1.2.3


From bdd4915a9f05ef6b41b51910b199f2668f20d2ef Mon Sep 17 00:00:00 2001
From: Ben Dooks <ben-linux@fluff.org>
Date: Mon, 3 Nov 2008 19:51:42 +0000
Subject: [ARM] S3C: Update CONFIG_SERIAL_SAMSUNG_UARTS handling

Fix the usage of CONFIG_SERIAL_SAMSUNG_UARTS in several places
in the kernel where it had been missed. This finishes fixing a
long standing issue where S3C2443 and S3C64XX could not use the
4th UART

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---
 arch/arm/plat-s3c/init.c | 2 +-
 drivers/serial/samsung.c | 9 ++++++---
 2 files changed, 7 insertions(+), 4 deletions(-)

(limited to 'drivers/serial')

diff --git a/arch/arm/plat-s3c/init.c b/arch/arm/plat-s3c/init.c
index 85f086ee930a..da8d089f6dbc 100644
--- a/arch/arm/plat-s3c/init.c
+++ b/arch/arm/plat-s3c/init.c
@@ -91,7 +91,7 @@ void __init s3c24xx_init_clocks(int xtal)
 
 static int nr_uarts __initdata = 0;
 
-static struct s3c2410_uartcfg uart_cfgs[3];
+static struct s3c2410_uartcfg uart_cfgs[CONFIG_SERIAL_SAMSUNG_UARTS];
 
 /* s3c24xx_init_uartdevs
  *
diff --git a/drivers/serial/samsung.c b/drivers/serial/samsung.c
index ec873af26101..dc7e7ebad236 100644
--- a/drivers/serial/samsung.c
+++ b/drivers/serial/samsung.c
@@ -824,7 +824,7 @@ static struct uart_ops s3c24xx_serial_ops = {
 static struct uart_driver s3c24xx_uart_drv = {
 	.owner		= THIS_MODULE,
 	.dev_name	= "s3c2410_serial",
-	.nr		= 3,
+	.nr		= CONFIG_SERIAL_SAMSUNG_UARTS,
 	.cons		= S3C24XX_SERIAL_CONSOLE,
 	.driver_name	= S3C24XX_SERIAL_NAME,
 	.major		= S3C24XX_SERIAL_MAJOR,
@@ -1012,8 +1012,11 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
 	if (port->mapbase != 0)
 		return 0;
 
-	if (cfg->hwport > 3)
-		return -EINVAL;
+	if (cfg->hwport > CONFIG_SERIAL_SAMSUNG_UARTS) {
+		printk(KERN_ERR "%s: port %d bigger than %d\n", __func__,
+		       cfg->hwport, CONFIG_SERIAL_SAMSUNG_UARTS);
+		return -ERANGE;
+	}
 
 	/* setup info for port */
 	port->dev	= &platdev->dev;
-- 
cgit v1.2.3


From 7de40c216c15c02c453f17b6c9ecee83f93790f1 Mon Sep 17 00:00:00 2001
From: Ben Dooks <ben-linux@fluff.org>
Date: Sun, 14 Dec 2008 23:11:02 +0000
Subject: [ARM] S3C: Remove cpufreq warnings for unset serial information

As noted by Russell King, do not print any warnings if the
uinfo or tty fields are not set when a CPU frequency change
is sent.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---
 drivers/serial/samsung.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

(limited to 'drivers/serial')

diff --git a/drivers/serial/samsung.c b/drivers/serial/samsung.c
index dc7e7ebad236..41ac94872b8d 100644
--- a/drivers/serial/samsung.c
+++ b/drivers/serial/samsung.c
@@ -937,17 +937,13 @@ static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb,
 		struct ktermios *termios;
 		struct tty_struct *tty;
 
-		if (uport->info == NULL) {
-			printk(KERN_WARNING "%s: info NULL\n", __func__);
+		if (uport->info == NULL)
 			goto exit;
-		}
 
 		tty = uport->info->port.tty;
 
-		if (tty == NULL) {
-			printk(KERN_WARNING "%s: tty is NULL\n", __func__);
+		if (tty == NULL)
 			goto exit;
-		}
 
 		termios = tty->termios;
 
-- 
cgit v1.2.3