---

yaml
---
r: 12237
b: refs/heads/master
c: 0f3278d
h: refs/heads/master
i:
  12235: d4c88c6
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 15c84a470116b2a3b58a7353a6cf711c29a91854
+refs/heads/master: 0f3278d14f0255e4cd9e07ccefc33ff12d8bb59c

trunk/Documentation/arm/Samsung-S3C24XX/Overview.txt

@@ -81,7 +81,8 @@ Adding New Machines
 
   Any large scale modifications, or new drivers should be discussed
   on the ARM kernel mailing list (linux-arm-kernel) before being
-  attempted.
+  attempted. See http://www.arm.linux.org.uk/mailinglists/ for the
+  mailing list information.
 
 
 NAND
@@ -120,6 +121,43 @@ Clock Management
   various clock units
 
 
+Platform Data
+-------------
+
+  Whenever a device has platform specific data that is specified
+  on a per-machine basis, care should be taken to ensure the
+  following:
+
+    1) that default data is not left in the device to confuse the
+       driver if a machine does not set it at startup
+
+    2) the data should (if possible) be marked as __initdata,
+       to ensure that the data is thrown away if the machine is
+       not the one currently in use.
+
+       The best way of doing this is to make a function that
+       kmalloc()s an area of memory, and copies the __initdata
+       and then sets the relevant device's platform data. Making
+       the function `__init` takes care of ensuring it is discarded
+       with the rest of the initialisation code
+
+       static __init void s3c24xx_xxx_set_platdata(struct xxx_data *pd)
+       {
+           struct s3c2410_xxx_mach_info *npd;
+
+	   npd = kmalloc(sizeof(struct s3c2410_xxx_mach_info), GFP_KERNEL);
+	   if (npd) {
+	      memcpy(npd, pd, sizeof(struct s3c2410_xxx_mach_info));
+	      s3c_device_xxx.dev.platform_data = npd;
+	   } else {
+              printk(KERN_ERR "no memory for xxx platform data\n");
+	   }
+	}
+
+	Note, since the code is marked as __init, it should not be
+	exported outside arch/arm/mach-s3c2410/, or exported to
+	modules via EXPORT_SYMBOL() and related functions.
+
 Port Contributors
 -----------------
 
@@ -149,6 +187,7 @@ Document Changes
   06 Mar 2005 - BJD - Added Christer Weinigel
   08 Mar 2005 - BJD - Added LCVR to list of people, updated introduction
   08 Mar 2005 - BJD - Added section on adding machines
+  09 Sep 2005 - BJD - Added section on platform data
 
 Document Author
 ---------------

trunk/Documentation/serial/driver

@@ -116,12 +116,15 @@ hardware.
 	line becoming inactive or the tty layer indicating we want
 	to stop transmission due to an XOFF character.
 
+	The driver should stop transmitting characters as soon as
+	possible.
+
 	Locking: port->lock taken.
 	Interrupts: locally disabled.
 	This call must not sleep
 
   start_tx(port)
-	start transmitting characters.
+	Start transmitting characters.
 
 	Locking: port->lock taken.
 	Interrupts: locally disabled.
@@ -281,33 +284,78 @@ hardware.
 Other functions
 ---------------
 
-uart_update_timeout(port,cflag,quot)
+uart_update_timeout(port,cflag,baud)
 	Update the FIFO drain timeout, port->timeout, according to the
-	number of bits, parity, stop bits and quotient.
+	number of bits, parity, stop bits and baud rate.
 
 	Locking: caller is expected to take port->lock
 	Interrupts: n/a
 
-uart_get_baud_rate(port,termios)
+uart_get_baud_rate(port,termios,old,min,max)
 	Return the numeric baud rate for the specified termios, taking
 	account of the special 38400 baud "kludge".  The B0 baud rate
 	is mapped to 9600 baud.
 
+	If the baud rate is not within min..max, then if old is non-NULL,
+	the original baud rate will be tried.  If that exceeds the
+	min..max constraint, 9600 baud will be returned.  termios will
+	be updated to the baud rate in use.
+
+	Note: min..max must always allow 9600 baud to be selected.
+
 	Locking: caller dependent.
 	Interrupts: n/a
 
-uart_get_divisor(port,termios,oldtermios)
-	Return the divsor (baud_base / baud) for the selected baud rate
-	specified by termios.  If the baud rate is out of range, try
-	the original baud rate specified by oldtermios (if non-NULL).
-	If that fails, try 9600 baud.
+uart_get_divisor(port,baud)
+	Return the divsor (baud_base / baud) for the specified baud
+	rate, appropriately rounded.
 
 	If 38400 baud and custom divisor is selected, return the
 	custom divisor instead.
 
 	Locking: caller dependent.
 	Interrupts: n/a
 
+uart_match_port(port1,port2)
+	This utility function can be used to determine whether two
+	uart_port structures describe the same port.
+
+	Locking: n/a
+	Interrupts: n/a
+
+uart_write_wakeup(port)
+	A driver is expected to call this function when the number of
+	characters in the transmit buffer have dropped below a threshold.
+
+	Locking: port->lock should be held.
+	Interrupts: n/a
+
+uart_register_driver(drv)
+	Register a uart driver with the core driver.  We in turn register
+	with the tty layer, and initialise the core driver per-port state.
+
+	drv->port should be NULL, and the per-port structures should be
+	registered using uart_add_one_port after this call has succeeded.
+
+	Locking: none
+	Interrupts: enabled
+
+uart_unregister_driver()
+	Remove all references to a driver from the core driver.  The low
+	level driver must have removed all its ports via the
+	uart_remove_one_port() if it registered them with uart_add_one_port().
+
+	Locking: none
+	Interrupts: enabled
+
+uart_suspend_port()
+
+uart_resume_port()
+
+uart_add_one_port()
+
+uart_remove_one_port()
+
 Other notes
 -----------
 

trunk/arch/arm/Kconfig

@@ -194,6 +194,13 @@ config ARCH_VERSATILE
 	help
 	  This enables support for ARM Ltd Versatile board.
 
+config ARCH_REALVIEW
+	bool "RealView"
+	select ARM_AMBA
+	select ICST307
+	help
+	  This enables support for ARM Ltd RealView boards.
+
 config ARCH_IMX
 	bool "IMX"
 
@@ -244,6 +251,8 @@ source "arch/arm/mach-versatile/Kconfig"
 
 source "arch/arm/mach-aaec2000/Kconfig"
 
+source "arch/arm/mach-realview/Kconfig"
+
 # Definitions to make life easier
 config ARCH_ACORN
 	bool
@@ -340,6 +349,13 @@ config NR_CPUS
 	depends on SMP
 	default "4"
 
+config HOTPLUG_CPU
+	bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
+	depends on SMP && HOTPLUG && EXPERIMENTAL
+	help
+	  Say Y here to experiment with turning CPUs off and on.  CPUs
+	  can be controlled through /sys/devices/system/cpu.
+
 config PREEMPT
 	bool "Preemptible Kernel (EXPERIMENTAL)"
 	depends on EXPERIMENTAL

trunk/arch/arm/Makefile

@@ -99,6 +99,7 @@ textaddr-$(CONFIG_ARCH_FORTUNET)   := 0xc0008000
  machine-$(CONFIG_ARCH_IMX)	   := imx
  machine-$(CONFIG_ARCH_H720X)	   := h720x
  machine-$(CONFIG_ARCH_AAEC2000)   := aaec2000
+ machine-$(CONFIG_ARCH_REALVIEW)   := realview
 
 ifeq ($(CONFIG_ARCH_EBSA110),y)
 # This is what happens if you forget the IOCS16 line.

trunk/arch/arm/configs/ixp4xx_defconfig

@@ -104,7 +104,7 @@ CONFIG_ARCH_IXCDP1100=y
 CONFIG_ARCH_PRPMC1100=y
 CONFIG_ARCH_IXDP4XX=y
 CONFIG_CPU_IXP46X=y
-CONFIG_MACH_GTWX5715=y
+# CONFIG_MACH_GTWX5715 is not set
 
 #
 # IXP4xx Options

trunk/arch/arm/kernel/irq.c

@@ -1050,3 +1050,34 @@ static int __init noirqdebug_setup(char *str)
 }
 
 __setup("noirqdebug", noirqdebug_setup);
+
+#ifdef CONFIG_HOTPLUG_CPU
+/*
+ * The CPU has been marked offline.  Migrate IRQs off this CPU.  If
+ * the affinity settings do not allow other CPUs, force them onto any
+ * available CPU.
+ */
+void migrate_irqs(void)
+{
+	unsigned int i, cpu = smp_processor_id();
+
+	for (i = 0; i < NR_IRQS; i++) {
+		struct irqdesc *desc = irq_desc + i;
+
+		if (desc->cpu == cpu) {
+			unsigned int newcpu = any_online_cpu(desc->affinity);
+
+			if (newcpu == NR_CPUS) {
+				if (printk_ratelimit())
+					printk(KERN_INFO "IRQ%u no longer affine to CPU%u\n",
+					       i, cpu);
+
+				cpus_setall(desc->affinity);
+				newcpu = any_online_cpu(desc->affinity);
+			}
+
+			route_irq(desc, i, newcpu);
+		}
+	}
+}
+#endif /* CONFIG_HOTPLUG_CPU */

trunk/arch/arm/kernel/process.c

@@ -26,6 +26,7 @@
 #include <linux/interrupt.h>
 #include <linux/kallsyms.h>
 #include <linux/init.h>
+#include <linux/cpu.h>
 
 #include <asm/system.h>
 #include <asm/io.h>
@@ -105,6 +106,14 @@ void cpu_idle(void)
 	/* endless idle loop with no priority at all */
 	while (1) {
 		void (*idle)(void) = pm_idle;
+
+#ifdef CONFIG_HOTPLUG_CPU
+		if (cpu_is_offline(smp_processor_id())) {
+			leds_event(led_idle_start);
+			cpu_die();
+		}
+#endif
+
 		if (!idle)
 			idle = default_idle;
 		preempt_disable();