From 35e71f90687fd904b43e3427673827ac3e77b4d1 Mon Sep 17 00:00:00 2001 From: Chris Zankel Date: Thu, 16 Apr 2009 00:25:39 -0700 Subject: xtensa: Fix architecture specific Kconfig Move a misplace endmenu marker to enable platform options and disable PCI and automatic calibrating for the XT2K board. The on-board PCI bridge is somewhat broken, anyway, and the calibrating relies on some whacky usage of the serial port. Signed-off-by: Chris Zankel --- arch/xtensa/Kconfig | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index fa6dc4dd3b1..30d21a9e2ef 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -137,6 +137,8 @@ config PCI source "drivers/pci/Kconfig" +endmenu + menu "Platform options" choice @@ -153,8 +155,6 @@ 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 +192,6 @@ config CMDLINE source "mm/Kconfig" -endmenu - config HOTPLUG bool "Support for hot-pluggable devices" help -- cgit v1.2.3 From 7dbe5c542464a511f0ea6a14e3ff08874d7e21d5 Mon Sep 17 00:00:00 2001 From: Chris Zankel Date: Thu, 16 Apr 2009 00:28:09 -0700 Subject: xtensa: Fix checksum header file We need to add a "memory" dependency (barrier) in assembly macros that access (read or write) memory. Otherwise, the compiler might ill-optimize the order of memory accesses. Signed-off-by: Chris Zankel --- arch/xtensa/include/asm/checksum.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/xtensa/include/asm/checksum.h b/arch/xtensa/include/asm/checksum.h index f84d3f00774..e4d831a3077 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); } -- cgit v1.2.3 From 586411dcd1935f91796d5e8a29aa3cfdf01a01f4 Mon Sep 17 00:00:00 2001 From: Johannes Weiner Date: Mon, 11 May 2009 15:43:33 +0200 Subject: xtensa: always use correct stack pointer for stack traces Commit '28a0ce7 xtensa: use correct stack pointer for stack traces' changed the stack tracer from always reading the stack pointer register to always using the saved value in the task descriptor. The author was too dense to consider the fact that the saved stack value is stale for a running process und thus unusable for 'current'. What we do now is to use the stack pointer register (a1) for when the task is unknown - we can't help it then - or when the task is 'current'. For everything else use the saved stack pointer value contained in the task descriptor. Signed-off-by: Johannes Weiner Signed-off-by: Chris Zankel --- arch/xtensa/kernel/traps.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c index 9f0b71189e9..ba9ab934978 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: "); -- cgit v1.2.3 From 1fb137c1e33cd188b40b3c0d7283412efeeb783f Mon Sep 17 00:00:00 2001 From: Johannes Weiner Date: Mon, 11 May 2009 15:43:34 +0200 Subject: xtensa: register gpio chip before use Platform initialization sets up the LED heartbeat that is controlled via GPIO. Requesting the GPIO pins fails, however, as the chip is only initialized later by a device_initcall(). Fix this up by exporting the initialization function. Let the platform set up the chip before it starts using it. Signed-off-by: Johannes Weiner Signed-off-by: Chris Zankel --- arch/xtensa/platforms/s6105/setup.c | 3 +++ arch/xtensa/variants/s6000/gpio.c | 3 +-- arch/xtensa/variants/s6000/include/variant/gpio.h | 6 ++++++ 3 files changed, 10 insertions(+), 2 deletions(-) create mode 100644 arch/xtensa/variants/s6000/include/variant/gpio.h diff --git a/arch/xtensa/platforms/s6105/setup.c b/arch/xtensa/platforms/s6105/setup.c index ae041d5027a..855ddeadc43 100644 --- a/arch/xtensa/platforms/s6105/setup.c +++ b/arch/xtensa/platforms/s6105/setup.c @@ -10,6 +10,8 @@ #include #include +#include + #include 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/gpio.c b/arch/xtensa/variants/s6000/gpio.c index 33a8d952934..79317fdcf14 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 00000000000..8327f62167e --- /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 */ -- cgit v1.2.3 From d15f05eb8cc4ad59699c16b8ae834b85c6d39bfe Mon Sep 17 00:00:00 2001 From: Oskar Schirmer Date: Mon, 11 May 2009 15:43:35 +0200 Subject: xtensa: fix wrong extern declaration renamed in code using it The variable ccount_nsec has been renamed to nsec_per_ccount in arch/xtensa/kernel/time.c in 2b8aea74 (2007-08-05), but the fix failed to rename the variable in arch/xtensa/include/asm/timex.h as well. Signed-off-by: Oskar Schirmer Signed-off-by: Chris Zankel --- arch/xtensa/include/asm/timex.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/xtensa/include/asm/timex.h b/arch/xtensa/include/asm/timex.h index b83a8181d44..053bc427210 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) -- cgit v1.2.3 From b070a03f6490b0ac8d95c51b55a64e433d9160ab Mon Sep 17 00:00:00 2001 From: Oskar Schirmer Date: Mon, 11 May 2009 15:43:36 +0200 Subject: xtensa: implement ccount calibration for s6000 Calculate core frequency from timers at boot time instead of assuming a fixed frequency. This is useful as the true frequency is set up by the boot loader, thus variable. Signed-off-by: Oskar Schirmer Signed-off-by: Chris Zankel --- arch/xtensa/Kconfig | 1 + arch/xtensa/variants/s6000/Makefile | 1 + arch/xtensa/variants/s6000/delay.c | 27 +++++++++++++++++++++++++++ 3 files changed, 29 insertions(+) create mode 100644 arch/xtensa/variants/s6000/delay.c diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index 30d21a9e2ef..ebe228d02b0 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 diff --git a/arch/xtensa/variants/s6000/Makefile b/arch/xtensa/variants/s6000/Makefile index 03b3975468b..d83f3805130 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 00000000000..54b2b573f16 --- /dev/null +++ b/arch/xtensa/variants/s6000/delay.c @@ -0,0 +1,27 @@ +#include +#include +#include +#include + +#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)); +} -- cgit v1.2.3 From 866e514d6a584810dc3ae25364f823b890b7d312 Mon Sep 17 00:00:00 2001 From: Oskar Schirmer Date: Mon, 11 May 2009 15:43:37 +0200 Subject: xtensa: update s6105_defconfig for ccount calibration The previous patch enabled ccount calibration for the s6000 variant. This patch updates the defconfig for the s6105 platform to reflect this change. Signed-off-by: Oskar Schirmer Signed-off-by: Chris Zankel --- arch/xtensa/configs/s6105_defconfig | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/xtensa/configs/s6105_defconfig b/arch/xtensa/configs/s6105_defconfig index 6e1deff4159..768bee00603 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" -- cgit v1.2.3 From 78f3cdfa2ac0aa2b72b3ee7e4b3c3e550230179f Mon Sep 17 00:00:00 2001 From: Chris Zankel Date: Tue, 21 Apr 2009 00:34:15 -0700 Subject: xtensa: Fix linker script to include .literal sections Fix resembles implementation from Marc Gauthier and Piet Denaly: In the Xtensa architecture, assembly generates literals which must always precede the code (the L32R instruction that loads them only uses negative PC-relative offsets). For any *.text section, literals are placed in a corresponding *.literal section. The linker script (vmlinux.lds) must place these in the correct order. It must also combine them, when the *.text section can be larger than L32R's 256 kB range. For example, this doesn't work: *(.literal) *(.text) because L32R instructions at the end of .text can't reach the literals. The linker can solve this if they are combined in parentheses, like this: *(.literal .text) because it is now allowed mix literals in .text to bring them in range. None of this is done by standard vmlinux.lds.h macros such as TEXT_TEXT and INIT_TEXT. To avoid replicating the logic of that header file, we instead post-process the generated linker script to convert *(xxx.text) to *(xxx.literal xxx.text) for the following text sections: .text .ref.text .*init.text .*exit.text .text.* using a sed script. To do this we must override the default rule for vmlinux.lds (see scripts/Makefile.build and the top-level Makefile) to insert this extra step. Signed-off-by: Marc Gauthier Signed-off-by: Pete Delaney Signed-off-by: Chris Zankel --- arch/xtensa/kernel/Makefile | 21 ++++++++++++++++++--- arch/xtensa/kernel/vmlinux.lds.S | 4 +--- 2 files changed, 19 insertions(+), 6 deletions(-) diff --git a/arch/xtensa/kernel/Makefile b/arch/xtensa/kernel/Makefile index 7419dbccf02..fe3186de6a3 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/vmlinux.lds.S b/arch/xtensa/kernel/vmlinux.lds.S index 5accf51053d..41c159cd872 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 = .; } -- cgit v1.2.3