Merge git://git.kernel.org/pub/scm/linux/kernel/git/czankel/xtensa-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/czankel/xtensa-2.6:
  xtensa: Fix linker script to include .literal sections
  xtensa: update s6105_defconfig for ccount calibration
  xtensa: implement ccount calibration for s6000
  xtensa: fix wrong extern declaration renamed in code using it
  xtensa: register gpio chip before use
  xtensa: always use correct stack pointer for stack traces
  xtensa: Fix checksum header file
  xtensa: Fix architecture specific Kconfig

12 files changed, 81 insertions, 20 deletions

diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index fa6dc4dd3b19..ebe228d02b08 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -80,6 +80,7 @@ config XTENSA_VARIANT_S6000
         bool "s6000 - Stretch software configurable processor"
         select VARIANT_IRQ_SWITCH
         select ARCH_REQUIRE_GPIOLIB
+        select XTENSA_CALIBRATE_CCOUNT
 endchoice
 
 config XTENSA_UNALIGNED_USER
@@ -137,6 +138,8 @@ config PCI
 
 source "drivers/pci/Kconfig"
 
+endmenu
+
 menu "Platform options"
 
 choice
@@ -153,8 +156,6 @@ config XTENSA_PLATFORM_ISS
 
 config XTENSA_PLATFORM_XT2000
         bool "XT2000"
-        select XTENSA_CALIBRATE_CCOUNT
-        select PCI
         help
           XT2000 is the name of Tensilica's feature-rich emulation platform.
           This hardware is capable of running a full Linux distribution.
@@ -192,8 +193,6 @@ config CMDLINE
 
 source "mm/Kconfig"
 
-endmenu
-
 config HOTPLUG
         bool "Support for hot-pluggable devices"
         help
diff --git a/arch/xtensa/configs/s6105_defconfig b/arch/xtensa/configs/s6105_defconfig
index 6e1deff41590..768bee006037 100644
--- a/arch/xtensa/configs/s6105_defconfig
+++ b/arch/xtensa/configs/s6105_defconfig
@@ -115,7 +115,7 @@ CONFIG_XTENSA_VARIANT_S6000=y
 CONFIG_PREEMPT=y
 # CONFIG_MATH_EMULATION is not set
 # CONFIG_HIGHMEM is not set
-# CONFIG_XTENSA_CALIBRATE_CCOUNT is not set
+CONFIG_XTENSA_CALIBRATE_CCOUNT=y
 CONFIG_SERIAL_CONSOLE=y
 # CONFIG_XTENSA_ISS_NETWORK is not set
 
@@ -131,7 +131,6 @@ CONFIG_SERIAL_CONSOLE=y
 # CONFIG_XTENSA_PLATFORM_ISS is not set
 # CONFIG_XTENSA_PLATFORM_XT2000 is not set
 CONFIG_XTENSA_PLATFORM_S6105=y
-CONFIG_XTENSA_CPU_CLOCK=300
 CONFIG_GENERIC_CALIBRATE_DELAY=y
 CONFIG_CMDLINE_BOOL=y
 CONFIG_CMDLINE="console=ttyS1,38400 debug bootmem_debug loglevel=7"
diff --git a/arch/xtensa/include/asm/checksum.h b/arch/xtensa/include/asm/checksum.h
index f84d3f00774a..e4d831a30772 100644
--- a/arch/xtensa/include/asm/checksum.h
+++ b/arch/xtensa/include/asm/checksum.h
@@ -113,7 +113,8 @@ static __inline__ __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
            are modified, we must also specify them as outputs, or gcc
            will assume they contain their original values. */
                 : "=r" (sum), "=r" (iph), "=r" (ihl), "=&r" (tmp), "=&r" (endaddr)
-                : "1" (iph), "2" (ihl));
+                : "1" (iph), "2" (ihl)
+                : "memory");
 
         return  csum_fold(sum);
 }
@@ -227,7 +228,8 @@ static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
                 "1:\t"
                 : "=r" (sum), "=&r" (__dummy)
                 : "r" (saddr), "r" (daddr),
-                  "r" (htonl(len)), "r" (htonl(proto)), "0" (sum));
+                  "r" (htonl(len)), "r" (htonl(proto)), "0" (sum)
+                : "memory");
 
         return csum_fold(sum);
 }
diff --git a/arch/xtensa/include/asm/timex.h b/arch/xtensa/include/asm/timex.h
index b83a8181d448..053bc4272106 100644
--- a/arch/xtensa/include/asm/timex.h
+++ b/arch/xtensa/include/asm/timex.h
@@ -39,9 +39,9 @@
 
 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
 extern unsigned long ccount_per_jiffy;
-extern unsigned long ccount_nsec;
+extern unsigned long nsec_per_ccount;
 #define CCOUNT_PER_JIFFY ccount_per_jiffy
-#define NSEC_PER_CCOUNT  ccount_nsec
+#define NSEC_PER_CCOUNT  nsec_per_ccount
 #else
 #define CCOUNT_PER_JIFFY (CONFIG_XTENSA_CPU_CLOCK*(1000000UL/HZ))
 #define NSEC_PER_CCOUNT (1000UL / CONFIG_XTENSA_CPU_CLOCK)
diff --git a/arch/xtensa/kernel/Makefile b/arch/xtensa/kernel/Makefile
index 7419dbccf027..fe3186de6a33 100644
--- a/arch/xtensa/kernel/Makefile
+++ b/arch/xtensa/kernel/Makefile
@@ -4,15 +4,30 @@
 
 extra-y := head.o vmlinux.lds
 
-
 obj-y := align.o entry.o irq.o coprocessor.o process.o ptrace.o \
          setup.o signal.o syscall.o time.o traps.o vectors.o platform.o  \
          pci-dma.o init_task.o io.o
 
-## windowspill.o
-
 obj-$(CONFIG_KGDB) += xtensa-stub.o
 obj-$(CONFIG_PCI) += pci.o
 obj-$(CONFIG_MODULES) += xtensa_ksyms.o module.o
 
+# In the Xtensa architecture, assembly generates literals which must always
+# precede the L32R instruction with a relative offset less than 256 kB.
+# Therefore, the .text and .literal section must be combined in parenthesis
+# in the linker script, such as: *(.literal .text).
+#
+# We need to post-process the generated vmlinux.lds scripts to convert
+# *(xxx.text) to  *(xxx.literal xxx.text) for the following text sections:
+#   .text .ref.text .*init.text .*exit.text .text.*
+#
+# Replicate rules in scripts/Makefile.build
+
+sed-y = -e 's/(\(\.[a-z]*it\|\.ref\|\)\.text)/(\1.literal \1.text)/g'   \
+        -e 's/(\(\.text\.[a-z]*\))/(\1.literal \1)/g'
+
+quiet_cmd__cpp_lds_S = LDS     $@
+      cmd__cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ $< | sed $(sed-y) >$@
 
+$(obj)/vmlinux.lds: $(src)/vmlinux.lds.S FORCE
+        $(call if_changed_dep,_cpp_lds_S)
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index 9f0b71189e94..ba9ab9349782 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -369,6 +369,18 @@ void show_regs(struct pt_regs * regs)
                        regs->syscall);
 }
 
+static __always_inline unsigned long *stack_pointer(struct task_struct *task)
+{
+        unsigned long *sp;
+
+        if (!task || task == current)
+                __asm__ __volatile__ ("mov %0, a1\n" : "=a"(sp));
+        else
+                sp = (unsigned long *)task->thread.sp;
+
+        return sp;
+}
+
 void show_trace(struct task_struct *task, unsigned long *sp)
 {
         unsigned long a0, a1, pc;
@@ -377,7 +389,7 @@ void show_trace(struct task_struct *task, unsigned long *sp)
         if (sp)
                 a1 = (unsigned long)sp;
         else
-                a1 = task->thread.sp;
+                a1 = (unsigned long)stack_pointer(task);
 
         sp_start = a1 & ~(THREAD_SIZE-1);
         sp_end = sp_start + THREAD_SIZE;
@@ -420,7 +432,7 @@ void show_stack(struct task_struct *task, unsigned long *sp)
         unsigned long *stack;
 
         if (!sp)
-                sp = (unsigned long *)task->thread.sp;
+                sp = stack_pointer(task);
         stack = sp;
 
         printk("\nStack: ");
diff --git a/arch/xtensa/kernel/vmlinux.lds.S b/arch/xtensa/kernel/vmlinux.lds.S
index 5accf51053da..41c159cd872f 100644
--- a/arch/xtensa/kernel/vmlinux.lds.S
+++ b/arch/xtensa/kernel/vmlinux.lds.S
@@ -87,7 +87,7 @@ SECTIONS
   {
     /* The HEAD_TEXT section must be the first section! */
     HEAD_TEXT
-    *(.literal .text)
+    TEXT_TEXT
     VMLINUX_SYMBOL(__sched_text_start) = .;
     *(.sched.literal .sched.text)
     VMLINUX_SYMBOL(__sched_text_end) = .;
@@ -139,8 +139,6 @@ SECTIONS
   __init_begin = .;
   .init.text : {
         _sinittext = .;
-        *(.init.literal) *(.cpuinit.literal) 
-        *(.devinit.literal) *(.meminit.literal)
         INIT_TEXT
         _einittext = .;
   }
diff --git a/arch/xtensa/platforms/s6105/setup.c b/arch/xtensa/platforms/s6105/setup.c
index ae041d5027a2..855ddeadc43d 100644
--- a/arch/xtensa/platforms/s6105/setup.c
+++ b/arch/xtensa/platforms/s6105/setup.c
@@ -10,6 +10,8 @@
 #include <asm/bootparam.h>
 
 #include <variant/hardware.h>
+#include <variant/gpio.h>
+
 #include <platform/gpio.h>
 
 void platform_halt(void)
@@ -47,6 +49,7 @@ void __init platform_setup(char **cmdline)
 
 void __init platform_init(bp_tag_t *first)
 {
+        s6_gpio_init();
         gpio_request(GPIO_LED1_NGREEN, "led1_green");
         gpio_request(GPIO_LED1_RED, "led1_red");
         gpio_direction_output(GPIO_LED1_NGREEN, 1);
diff --git a/arch/xtensa/variants/s6000/Makefile b/arch/xtensa/variants/s6000/Makefile
index 03b3975468bd..d83f3805130c 100644
--- a/arch/xtensa/variants/s6000/Makefile
+++ b/arch/xtensa/variants/s6000/Makefile
@@ -1,3 +1,4 @@
 # s6000 Makefile
 
 obj-y           += irq.o gpio.o
+obj-$(CONFIG_XTENSA_CALIBRATE_CCOUNT)   += delay.o
diff --git a/arch/xtensa/variants/s6000/delay.c b/arch/xtensa/variants/s6000/delay.c
new file mode 100644
index 000000000000..54b2b573f166
--- /dev/null
+++ b/arch/xtensa/variants/s6000/delay.c
@@ -0,0 +1,27 @@
+#include <asm/delay.h>
+#include <asm/timex.h>
+#include <asm/io.h>
+#include <variant/hardware.h>
+
+#define LOOPS 10
+void platform_calibrate_ccount(void)
+{
+        u32 uninitialized_var(a);
+        u32 uninitialized_var(u);
+        u32 b;
+        u32 tstamp = S6_REG_GREG1 + S6_GREG1_GLOBAL_TIMER;
+        int i = LOOPS+1;
+        do {
+                u32 t = u;
+                asm volatile(
+                "1:     l32i %0, %2, 0 ;"
+                "       beq %0, %1, 1b ;"
+                : "=&a"(u) : "a"(t), "a"(tstamp));
+                b = xtensa_get_ccount();
+                if (i == LOOPS)
+                        a = b;
+        } while (--i >= 0);
+        b -= a;
+        nsec_per_ccount = (LOOPS * 10000) / b;
+        ccount_per_jiffy = b * (100000UL / (LOOPS * HZ));
+}
diff --git a/arch/xtensa/variants/s6000/gpio.c b/arch/xtensa/variants/s6000/gpio.c
index 33a8d952934c..79317fdcf14c 100644
--- a/arch/xtensa/variants/s6000/gpio.c
+++ b/arch/xtensa/variants/s6000/gpio.c
@@ -64,8 +64,7 @@ static struct gpio_chip gpiochip = {
         .exported = 0, /* no exporting to userspace */
 };
 
-static int gpio_init(void)
+int s6_gpio_init(void)
 {
         return gpiochip_add(&gpiochip);
 }
-device_initcall(gpio_init);
diff --git a/arch/xtensa/variants/s6000/include/variant/gpio.h b/arch/xtensa/variants/s6000/include/variant/gpio.h
new file mode 100644
index 000000000000..8327f62167eb
--- /dev/null
+++ b/arch/xtensa/variants/s6000/include/variant/gpio.h
@@ -0,0 +1,6 @@
+#ifndef _XTENSA_VARIANT_S6000_GPIO_H
+#define _XTENSA_VARIANT_S6000_GPIO_H
+
+extern int s6_gpio_init(void);
+
+#endif /* _XTENSA_VARIANT_S6000_GPIO_H */