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-rw-r--r--arch/xtensa/Kconfig7
-rw-r--r--arch/xtensa/configs/s6105_defconfig3
-rw-r--r--arch/xtensa/include/asm/checksum.h6
-rw-r--r--arch/xtensa/include/asm/ftrace.h1
-rw-r--r--arch/xtensa/include/asm/timex.h4
-rw-r--r--arch/xtensa/kernel/Makefile21
-rw-r--r--arch/xtensa/kernel/head.S3
-rw-r--r--arch/xtensa/kernel/traps.c16
-rw-r--r--arch/xtensa/kernel/vmlinux.lds.S8
-rw-r--r--arch/xtensa/platforms/s6105/setup.c3
-rw-r--r--arch/xtensa/variants/s6000/Makefile1
-rw-r--r--arch/xtensa/variants/s6000/delay.c27
-rw-r--r--arch/xtensa/variants/s6000/gpio.c3
-rw-r--r--arch/xtensa/variants/s6000/include/variant/gpio.h6
14 files changed, 86 insertions, 23 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/ftrace.h b/arch/xtensa/include/asm/ftrace.h
new file mode 100644
index 000000000000..40a8c178f10d
--- /dev/null
+++ b/arch/xtensa/include/asm/ftrace.h
@@ -0,0 +1 @@
+/* empty */
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/head.S b/arch/xtensa/kernel/head.S
index 0817f9db836e..d9ddc1ba761c 100644
--- a/arch/xtensa/kernel/head.S
+++ b/arch/xtensa/kernel/head.S
@@ -19,6 +19,7 @@
#include <asm/page.h>
#include <asm/cacheasm.h>
+#include <linux/init.h>
#include <linux/linkage.h>
/*
@@ -45,7 +46,7 @@
* instruction.
*/
- .section .head.text, "ax"
+ __HEAD
.globl _start
_start: _j 2f
.align 4
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 c1be9a4a740c..41c159cd872f 100644
--- a/arch/xtensa/kernel/vmlinux.lds.S
+++ b/arch/xtensa/kernel/vmlinux.lds.S
@@ -85,9 +85,9 @@ SECTIONS
.text :
{
- /* The .head.text section must be the first section! */
- *(.head.text)
- *(.literal .text)
+ /* The HEAD_TEXT section must be the first section! */
+ HEAD_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 */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-21 11:49:36 +0100