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: (21 commits)
  xtensa: we don't need to include asm/io.h
  xtensa: only build platform or variant if they contain a Makefile
  xtensa: make startup code discardable
  xtensa: ccount clocksource
  xtensa: remove platform rtc hooks
  xtensa: use generic sched_clock()
  xtensa: platform: s6105
  xtensa: let platform override KERNELOFFSET
  xtensa: s6000 variant
  xtensa: s6000 variant core definitions
  xtensa: variant irq set callbacks
  xtensa: variant-specific code
  xtensa: nommu support
  xtensa: add flat support
  xtensa: enforce slab alignment to maximum register width
  xtensa: cope with ram beginning at higher addresses
  xtensa: don't make bootmem bitmap larger than required
  xtensa: fix init_bootmem_node() argument order
  xtensa: use correct stack pointer for stack traces
  xtensa: beat Kconfig into shape
  ...

arch/xtensa/Kconfig

@@ -4,16 +4,13 @@
 mainmenu "Linux/Xtensa Kernel Configuration"
 
 config FRAME_POINTER
-	bool
-	default n
+	def_bool n
 
 config ZONE_DMA
-	bool
-	default y
+	def_bool y
 
 config XTENSA
-	bool
-	default y
+	def_bool y
 	select HAVE_IDE
 	help
 	  Xtensa processors are 32-bit RISC machines designed by Tensilica
@@ -24,28 +21,25 @@ config XTENSA
 	  a home page at <http://xtensa.sourceforge.net/>.
 
 config RWSEM_XCHGADD_ALGORITHM
-	bool
-	default y
+	def_bool y
 
 config GENERIC_FIND_NEXT_BIT
-	bool
-	default y
+	def_bool y
 
 config GENERIC_HWEIGHT
-	bool
-	default y
+	def_bool y
 
 config GENERIC_HARDIRQS
-	bool
-	default y
+	def_bool y
+
+config GENERIC_GPIO
+	def_bool y
 
 config ARCH_HAS_ILOG2_U32
-	bool
-	default n
+	def_bool n
 
 config ARCH_HAS_ILOG2_U64
-	bool
-	default n
+	def_bool n
 
 config NO_IOPORT
 	def_bool y
@@ -54,9 +48,18 @@ config HZ
 	int
 	default 100
 
+config GENERIC_TIME
+	def_bool y
+
 source "init/Kconfig"
 source "kernel/Kconfig.freezer"
 
+config MMU
+	def_bool n
+
+config VARIANT_IRQ_SWITCH
+	def_bool n
+
 menu "Processor type and features"
 
 choice
@@ -65,38 +68,41 @@ choice
 
 config XTENSA_VARIANT_FSF
 	bool "fsf - default (not generic) configuration"
+	select MMU
 
 config XTENSA_VARIANT_DC232B
 	bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
+	select MMU
 	help
-	This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
-endchoice
+	  This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
 
-config MMU
-	bool
-	default y
+config XTENSA_VARIANT_S6000
+	bool "s6000 - Stretch software configurable processor"
+	select VARIANT_IRQ_SWITCH
+	select ARCH_REQUIRE_GPIOLIB
+endchoice
 
 config XTENSA_UNALIGNED_USER
 	bool "Unaligned memory access in use space"
-	---help---
-	   The Xtensa architecture currently does not handle unaligned
-	   memory accesses in hardware but through an exception handler.
-	   Per default, unaligned memory accesses are disabled in user space.
+	help
+	  The Xtensa architecture currently does not handle unaligned
+	  memory accesses in hardware but through an exception handler.
+	  Per default, unaligned memory accesses are disabled in user space.
 
-	   Say Y here to enable unaligned memory access in user space.
+	  Say Y here to enable unaligned memory access in user space.
 
 config PREEMPT
 	bool "Preemptible Kernel"
-	---help---
-           This option reduces the latency of the kernel when reacting to
-           real-time or interactive events by allowing a low priority process to
-           be preempted even if it is in kernel mode executing a system call.
-           Unfortunately the kernel code has some race conditions if both
-           CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
-           currently disabled if you are building an SMP kernel.
+	help
+          This option reduces the latency of the kernel when reacting to
+          real-time or interactive events by allowing a low priority process to
+          be preempted even if it is in kernel mode executing a system call.
+          Unfortunately the kernel code has some race conditions if both
+          CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
+          currently disabled if you are building an SMP kernel.
 
-           Say Y here if you are building a kernel for a desktop, embedded
-           or real-time system.  Say N if you are unsure.
+          Say Y here if you are building a kernel for a desktop, embedded
+          or real-time system.  Say N if you are unsure.
 
 config MATH_EMULATION
 	bool "Math emulation"
@@ -105,6 +111,32 @@ config MATH_EMULATION
 
 endmenu
 
+config XTENSA_CALIBRATE_CCOUNT
+	def_bool n
+	help
+	  On some platforms (XT2000, for example), the CPU clock rate can
+	  vary.  The frequency can be determined, however, by measuring
+	  against a well known, fixed frequency, such as an UART oscillator.
+
+config SERIAL_CONSOLE
+	def_bool n
+
+config XTENSA_ISS_NETWORK
+	def_bool n
+
+menu "Bus options"
+
+config PCI
+	bool "PCI support"
+	default y
+	help
+	  Find out whether you have a PCI motherboard. PCI is the name of a
+	  bus system, i.e. the way the CPU talks to the other stuff inside
+	  your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
+	  VESA. If you have PCI, say Y, otherwise N.
+
+source "drivers/pci/Kconfig"
+
 menu "Platform options"
 
 choice
@@ -113,33 +145,35 @@ choice
 
 config XTENSA_PLATFORM_ISS
 	bool "ISS"
+	select XTENSA_CALIBRATE_CCOUNT
+	select SERIAL_CONSOLE
+	select XTENSA_ISS_NETWORK
 	help
 	  ISS is an acronym for Tensilica's Instruction Set Simulator.
 
 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.
 
-endchoice
+config XTENSA_PLATFORM_S6105
+	bool "S6105"
+	select SERIAL_CONSOLE
 
+endchoice
 
-config XTENSA_CALIBRATE_CCOUNT
-	bool "Auto calibration of the CPU clock rate"
-	---help---
-	  On some platforms (XT2000, for example), the CPU clock rate can
-	  vary.  The frequency can be determined, however, by measuring
-	  against a well known, fixed frequency, such as an UART oscillator.
 
 config XTENSA_CPU_CLOCK
 	int "CPU clock rate [MHz]"
 	depends on !XTENSA_CALIBRATE_CCOUNT
-	default "16"
+	default 16
 
 config GENERIC_CALIBRATE_DELAY
 	bool "Auto calibration of the BogoMIPS value"
-	---help---
+	help
 	  The BogoMIPS value can easily be derived from the CPU frequency.
 
 config CMDLINE_BOOL
@@ -156,52 +190,27 @@ config CMDLINE
 	  time by entering them here. As a minimum, you should specify the
 	  memory size and the root device (e.g., mem=64M root=/dev/nfs).
 
-config SERIAL_CONSOLE
-	bool
-	depends on XTENSA_PLATFORM_ISS
-	default y
-
-config XTENSA_ISS_NETWORK
-	bool
-	depends on XTENSA_PLATFORM_ISS
-	default y
-
 source "mm/Kconfig"
 
 endmenu
 
-menu "Bus options"
-
-config PCI
-	bool "PCI support" if !XTENSA_PLATFORM_ISS
-	depends on !XTENSA_PLATFORM_ISS
-	default y
+config HOTPLUG
+	bool "Support for hot-pluggable devices"
 	help
-	  Find out whether you have a PCI motherboard. PCI is the name of a
-	  bus system, i.e. the way the CPU talks to the other stuff inside
-	  your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
-	  VESA. If you have PCI, say Y, otherwise N.
+	  Say Y here if you want to plug devices into your computer while
+	  the system is running, and be able to use them quickly.  In many
+	  cases, the devices can likewise be unplugged at any time too.
 
-source "drivers/pci/Kconfig"
+	  One well known example of this is PCMCIA- or PC-cards, credit-card
+	  size devices such as network cards, modems or hard drives which are
+	  plugged into slots found on all modern laptop computers.  Another
+	  example, used on modern desktops as well as laptops, is USB.
 
-config HOTPLUG
-
-	bool "Support for hot-pluggable devices"
-	---help---
-	Say Y here if you want to plug devices into your computer while
-	the system is running, and be able to use them quickly.  In many
-	cases, the devices can likewise be unplugged at any time too.
-
-	One well known example of this is PCMCIA- or PC-cards, credit-card
-	size devices such as network cards, modems or hard drives which are
-	plugged into slots found on all modern laptop computers.  Another
-	example, used on modern desktops as well as laptops, is USB.
-
-	Enable HOTPLUG and build a modular kernel.  Get agent software
-	(from <http://linux-hotplug.sourceforge.net/>) and install it.
-	Then your kernel will automatically call out to a user mode "policy
-	agent" (/sbin/hotplug) to load modules and set up software needed
-	to use devices as you hotplug them.
+	  Enable HOTPLUG and build a modular kernel.  Get agent software
+	  (from <http://linux-hotplug.sourceforge.net/>) and install it.
+	  Then your kernel will automatically call out to a user mode "policy
+	  agent" (/sbin/hotplug) to load modules and set up software needed
+	  to use devices as you hotplug them.
 
 source "drivers/pcmcia/Kconfig"
 
@@ -213,9 +222,8 @@ menu "Executable file formats"
 
 # only elf supported
 config KCORE_ELF
-        bool
+	def_bool y
         depends on PROC_FS
-        default y
         help
           If you enabled support for /proc file system then the file
           /proc/kcore will contain the kernel core image in ELF format. This
@@ -240,7 +248,7 @@ source "fs/Kconfig"
 menu "Xtensa initrd options"
 	depends on BLK_DEV_INITRD
 
-	config EMBEDDED_RAMDISK
+config EMBEDDED_RAMDISK
 	bool "Embed root filesystem ramdisk into the kernel"
 
 config EMBEDDED_RAMDISK_IMAGE

arch/xtensa/Makefile

@@ -15,6 +15,7 @@
 
 variant-$(CONFIG_XTENSA_VARIANT_FSF)		:= fsf
 variant-$(CONFIG_XTENSA_VARIANT_DC232B)		:= dc232b
+variant-$(CONFIG_XTENSA_VARIANT_S6000)		:= s6000
 variant-$(CONFIG_XTENSA_VARIANT_LINUX_CUSTOM)	:= custom
 
 VARIANT = $(variant-y)
@@ -24,6 +25,7 @@ export VARIANT
 
 platform-$(CONFIG_XTENSA_PLATFORM_XT2000)	:= xt2000
 platform-$(CONFIG_XTENSA_PLATFORM_ISS)		:= iss
+platform-$(CONFIG_XTENSA_PLATFORM_S6105)	:= s6105
 
 PLATFORM = $(platform-y)
 export PLATFORM
@@ -62,20 +64,23 @@ ifneq ($(VARIANT),)
   endif
 endif
 
-#
+# Only build variant and/or platform if it includes a Makefile
+
+buildvar := $(shell test -a $(srctree)/arch/xtensa/variants/$(VARIANT)/Makefile && echo arch/xtensa/variants/$(VARIANT)/)
+buildplf := $(shell test -a $(srctree)/arch/xtensa/platforms/$(PLATFORM)/Makefile && echo arch/xtensa/platforms/$(PLATFORM)/)
+
+# Find libgcc.a
 
 LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
 
 head-y		:= arch/xtensa/kernel/head.o
 core-y		+= arch/xtensa/kernel/ arch/xtensa/mm/
-ifneq ($(PLATFORM),)
-core-y		+= arch/xtensa/platforms/$(PLATFORM)/
-endif
+core-y		+= $(buildvar) $(buildplf)
+
 libs-y		+= arch/xtensa/lib/ $(LIBGCC)
 
 boot		:= arch/xtensa/boot
 
-
 all: zImage
 
 bzImage : zImage

arch/xtensa/include/asm/cacheflush.h

@@ -65,13 +65,17 @@ extern void __flush_invalidate_dcache_range(unsigned long, unsigned long);
 # define __flush_invalidate_dcache_range(p,s)	__invalidate_dcache_range(p,s)
 #endif
 
-#if (DCACHE_WAY_SIZE > PAGE_SIZE)
+#if defined(CONFIG_MMU) && (DCACHE_WAY_SIZE > PAGE_SIZE)
 extern void __flush_invalidate_dcache_page_alias(unsigned long, unsigned long);
+#else
+static inline void __flush_invalidate_dcache_page_alias(unsigned long virt,
+							unsigned long phys) { }
 #endif
-#if (ICACHE_WAY_SIZE > PAGE_SIZE)
+#if defined(CONFIG_MMU) && (ICACHE_WAY_SIZE > PAGE_SIZE)
 extern void __invalidate_icache_page_alias(unsigned long, unsigned long);
 #else
-# define __invalidate_icache_page_alias(v,p)	do { } while(0)
+static inline void __invalidate_icache_page_alias(unsigned long virt,
+						unsigned long phys) { }
 #endif
 
 /*

arch/xtensa/include/asm/dma.h

@@ -44,8 +44,9 @@
  *	the value desired).
  */
 
+#ifndef MAX_DMA_ADDRESS
 #define MAX_DMA_ADDRESS		(PAGE_OFFSET + XCHAL_KIO_SIZE - 1)
-
+#endif
 
 /* Reserve and release a DMA channel */
 extern int request_dma(unsigned int dmanr, const char * device_id);

arch/xtensa/include/asm/flat.h

+#ifndef __ASM_XTENSA_FLAT_H
+#define __ASM_XTENSA_FLAT_H
+
+#define flat_argvp_envp_on_stack()			0
+#define flat_old_ram_flag(flags)			(flags)
+#define flat_reloc_valid(reloc, size)			((reloc) <= (size))
+#define flat_get_addr_from_rp(rp, relval, flags, p)	get_unaligned(rp)
+#define flat_put_addr_at_rp(rp, val, relval	)	put_unaligned(val, rp)
+#define flat_get_relocate_addr(rel)			(rel)
+#define flat_set_persistent(relval, p)			0
+
+#endif /* __ASM_XTENSA_FLAT_H */

arch/xtensa/include/asm/gpio.h

+/*
+ * Generic GPIO API implementation for xtensa.
+ *
+ * Stolen from x86, which is derived from the generic GPIO API for powerpc:
+ *
+ * Copyright (c) 2007-2008  MontaVista Software, Inc.
+ *
+ * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef _ASM_XTENSA_GPIO_H
+#define _ASM_XTENSA_GPIO_H
+
+#include <asm-generic/gpio.h>
+
+#ifdef CONFIG_GPIOLIB
+
+/*
+ * Just call gpiolib.
+ */
+static inline int gpio_get_value(unsigned int gpio)
+{
+	return __gpio_get_value(gpio);
+}
+
+static inline void gpio_set_value(unsigned int gpio, int value)
+{
+	__gpio_set_value(gpio, value);
+}
+
+static inline int gpio_cansleep(unsigned int gpio)
+{
+	return __gpio_cansleep(gpio);
+}
+
+/*
+ * Not implemented, yet.
+ */
+static inline int gpio_to_irq(unsigned int gpio)
+{
+	return -ENOSYS;
+}
+
+static inline int irq_to_gpio(unsigned int irq)
+{
+	return -EINVAL;
+}
+
+#endif /* CONFIG_GPIOLIB */
+
+#endif /* _ASM_XTENSA_GPIO_H */

arch/xtensa/include/asm/io.h

@@ -69,21 +69,28 @@ static inline void * phys_to_virt(unsigned long address)
 
 static inline void *ioremap(unsigned long offset, unsigned long size)
 {
+#ifdef CONFIG_MMU
 	if (offset >= XCHAL_KIO_PADDR
 	    && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
 		return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
-
 	else
 		BUG();
+#else
+	return (void *)offset;
+#endif
 }
 
 static inline void *ioremap_nocache(unsigned long offset, unsigned long size)
 {
+#ifdef CONFIG_MMU
 	if (offset >= XCHAL_KIO_PADDR
 	    && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
 		return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
 	else
 		BUG();
+#else
+	return (void *)offset;
+#endif
 }
 
 static inline void iounmap(void *addr)

arch/xtensa/include/asm/irq.h

@@ -14,6 +14,13 @@
 #include <platform/hardware.h>
 #include <variant/core.h>
 
+#ifdef CONFIG_VARIANT_IRQ_SWITCH
+#include <variant/irq.h>
+#else
+static inline void variant_irq_enable(unsigned int irq) { }
+static inline void variant_irq_disable(unsigned int irq) { }
+#endif
+
 #ifndef PLATFORM_NR_IRQS
 # define PLATFORM_NR_IRQS 0
 #endif

arch/xtensa/include/asm/mmu.h

@@ -11,7 +11,12 @@
 #ifndef _XTENSA_MMU_H
 #define _XTENSA_MMU_H
 
+#ifndef CONFIG_MMU
+#include <asm/nommu.h>
+#else
+
 /* Default "unsigned long" context */
 typedef unsigned long mm_context_t;
 
+#endif /* CONFIG_MMU */
 #endif	/* _XTENSA_MMU_H */

arch/xtensa/include/asm/mmu_context.h

@@ -13,16 +13,20 @@
 #ifndef _XTENSA_MMU_CONTEXT_H
 #define _XTENSA_MMU_CONTEXT_H
 
+#ifndef CONFIG_MMU
+#include <asm/nommu_context.h>
+#else
+
 #include <linux/stringify.h>
 #include <linux/sched.h>
 
+#include <variant/core.h>
+
 #include <asm/pgtable.h>
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>
 #include <asm-generic/mm_hooks.h>
 
-#define XCHAL_MMU_ASID_BITS	8
-
 #if (XCHAL_HAVE_TLBS != 1)
 # error "Linux must have an MMU!"
 #endif
@@ -133,4 +137,5 @@ static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
 
 }
 
+#endif /* CONFIG_MMU */
 #endif /* _XTENSA_MMU_CONTEXT_H */

arch/xtensa/include/asm/nommu.h

+typedef struct {
+	unsigned long end_brk;
+} mm_context_t;

arch/xtensa/include/asm/nommu_context.h

+static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
+{
+}
+
+static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
+{
+	return 0;
+}
+
+static inline void destroy_context(struct mm_struct *mm)
+{
+}
+
+static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
+{
+}
+
+static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
+				struct task_struct *tsk)
+{
+}
+
+static inline void deactivate_mm(struct task_struct *tsk, struct mm_struct *mm)
+{
+}

arch/xtensa/include/asm/page.h

@@ -14,6 +14,7 @@
 #include <asm/processor.h>
 #include <asm/types.h>
 #include <asm/cache.h>
+#include <platform/hardware.h>
 
 /*
  * Fixed TLB translations in the processor.
@@ -32,8 +33,14 @@
 #define PAGE_SIZE		(__XTENSA_UL_CONST(1) << PAGE_SHIFT)
 #define PAGE_MASK		(~(PAGE_SIZE-1))
 
+#ifdef CONFIG_MMU
 #define PAGE_OFFSET		XCHAL_KSEG_CACHED_VADDR
 #define MAX_MEM_PFN		XCHAL_KSEG_SIZE
+#else
+#define PAGE_OFFSET		0
+#define MAX_MEM_PFN		(PLATFORM_DEFAULT_MEM_START + PLATFORM_DEFAULT_MEM_SIZE)
+#endif
+
 #define PGTABLE_START		0x80000000
 
 /*
@@ -150,9 +157,11 @@ extern void copy_user_page(void*, void*, unsigned long, struct page*);
  * addresses.
  */
 
+#define ARCH_PFN_OFFSET		(PLATFORM_DEFAULT_MEM_START >> PAGE_SHIFT)
+
 #define __pa(x)			((unsigned long) (x) - PAGE_OFFSET)
 #define __va(x)			((void *)((unsigned long) (x) + PAGE_OFFSET))
-#define pfn_valid(pfn)		((unsigned long)pfn < max_mapnr)
+#define pfn_valid(pfn)		((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
 #ifdef CONFIG_DISCONTIGMEM
 # error CONFIG_DISCONTIGMEM not supported
 #endif
@@ -162,8 +171,9 @@ extern void copy_user_page(void*, void*, unsigned long, struct page*);
 #define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 #define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
 
+#ifdef CONFIG_MMU
 #define WANT_PAGE_VIRTUAL
-
+#endif
 
 #endif /* __ASSEMBLY__ */
 

arch/xtensa/include/asm/pgtable.h

@@ -183,7 +183,15 @@ extern unsigned long empty_zero_page[1024];
 
 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
 
+#ifdef CONFIG_MMU
 extern pgd_t swapper_pg_dir[PAGE_SIZE/sizeof(pgd_t)];
+extern void paging_init(void);
+extern void pgtable_cache_init(void);
+#else
+# define swapper_pg_dir NULL
+static inline void paging_init(void) { }
+static inline void pgtable_cache_init(void) { }
+#endif
 
 /*
  * The pmd contains the kernel virtual address of the pte page.
@@ -383,8 +391,6 @@ ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 
 #else
 
-extern void paging_init(void);
-
 #define kern_addr_valid(addr)	(1)
 
 extern  void update_mmu_cache(struct vm_area_struct * vma,
@@ -398,9 +404,6 @@ extern  void update_mmu_cache(struct vm_area_struct * vma,
 #define io_remap_pfn_range(vma,from,pfn,size,prot) \
                 remap_pfn_range(vma, from, pfn, size, prot)
 
-
-extern void pgtable_cache_init(void);
-
 typedef pte_t *pte_addr_t;
 
 #endif /* !defined (__ASSEMBLY__) */

arch/xtensa/include/asm/platform.h

@@ -74,16 +74,5 @@ extern int platform_pcibios_fixup (void);
  */
 extern void platform_calibrate_ccount (void);
 
-/*
- * platform_get_rtc_time returns RTC seconds (returns 0 for no error)
- */
-extern int platform_get_rtc_time(time_t*);
-
-/*
- * platform_set_rtc_time set RTC seconds (returns 0 for no error)
- */
-extern int platform_set_rtc_time(time_t);
-
-
 #endif	/* _XTENSA_PLATFORM_H */
 

arch/xtensa/include/asm/processor.h

@@ -13,6 +13,7 @@
 
 #include <variant/core.h>
 #include <asm/coprocessor.h>
+#include <platform/hardware.h>
 
 #include <linux/compiler.h>
 #include <asm/ptrace.h>
@@ -25,6 +26,8 @@
 # error Linux requires the Xtensa Windowed Registers Option.
 #endif
 
+#define ARCH_SLAB_MINALIGN	XCHAL_DATA_WIDTH
+
 /*
  * User space process size: 1 GB.
  * Windowed call ABI requires caller and callee to be located within the same
@@ -33,7 +36,12 @@
  * the 1 GB requirement applies to the stack as well.
  */
 
+#ifdef CONFIG_MMU
 #define TASK_SIZE	__XTENSA_UL_CONST(0x40000000)
+#else
+#define TASK_SIZE	(PLATFORM_DEFAULT_MEM_START + PLATFORM_DEFAULT_MEM_SIZE)
+#endif
+
 #define STACK_TOP	TASK_SIZE
 #define STACK_TOP_MAX	STACK_TOP
 

arch/xtensa/kernel/entry.S

@@ -1463,6 +1463,7 @@ ENTRY(_spill_registers)
 	callx0	a0		# should not return
 1:	j	1b
 
+#ifdef CONFIG_MMU
 /*
  * We should never get here. Bail out!
  */
@@ -1775,7 +1776,7 @@ ENTRY(fast_store_prohibited)
 	bbsi.l	a2, PS_UM_BIT, 1f
 	j	_kernel_exception
 1:	j	_user_exception
-
+#endif /* CONFIG_MMU */
 
 /*
  * System Calls.

arch/xtensa/kernel/head.S

@@ -53,7 +53,7 @@ _start:	_j	2f
 2:	l32r	a0, 1b
 	jx	a0
 
-	.text
+	.section .init.text, "ax"
 	.align 4
 _startup:
 
@@ -235,8 +235,9 @@ should_never_return:
  */
 	
 .section ".bss.page_aligned", "w"
+#ifdef CONFIG_MMU
 ENTRY(swapper_pg_dir)
 	.fill	PAGE_SIZE, 1, 0
+#endif
 ENTRY(empty_zero_page)
 	.fill	PAGE_SIZE, 1, 0
-

arch/xtensa/kernel/irq.c

@@ -132,6 +132,18 @@ static void xtensa_irq_unmask(unsigned int irq)
 	set_sr (cached_irq_mask, INTENABLE);
 }
 
+static void xtensa_irq_enable(unsigned int irq)
+{
+	variant_irq_enable(irq);
+	xtensa_irq_unmask(irq);
+}
+
+static void xtensa_irq_disable(unsigned int irq)
+{
+	xtensa_irq_mask(irq);
+	variant_irq_disable(irq);
+}
+
 static void xtensa_irq_ack(unsigned int irq)
 {
 	set_sr(1 << irq, INTCLEAR);
@@ -146,6 +158,8 @@ static int xtensa_irq_retrigger(unsigned int irq)
 
 static struct irq_chip xtensa_irq_chip = {
 	.name		= "xtensa",
+	.enable		= xtensa_irq_enable,
+	.disable	= xtensa_irq_disable,
 	.mask		= xtensa_irq_mask,
 	.unmask		= xtensa_irq_unmask,
 	.ack		= xtensa_irq_ack,

arch/xtensa/kernel/platform.c

@@ -36,8 +36,6 @@ _F(void, power_off, (void), { while(1); });
 _F(void, idle, (void), { __asm__ __volatile__ ("waiti 0" ::: "memory"); });
 _F(void, heartbeat, (void), { });
 _F(int,  pcibios_fixup, (void), { return 0; });
-_F(int, get_rtc_time, (time_t* t), { return 0; });
-_F(int, set_rtc_time, (time_t t), { return 0; });
 
 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
 _F(void, calibrate_ccount, (void),

arch/xtensa/kernel/setup.c

@@ -84,7 +84,13 @@ sysmem_info_t __initdata sysmem;
 int initrd_is_mapped;
 #endif
 
+#ifdef CONFIG_MMU
 extern void init_mmu(void);
+#else
+static inline void init_mmu(void) { }
+#endif
+
+extern void zones_init(void);
 
 /*
  * Boot parameter parsing.
@@ -286,6 +292,7 @@ void __init setup_arch(char **cmdline_p)
 
 
 	paging_init();
+	zones_init();
 
 #ifdef CONFIG_VT
 # if defined(CONFIG_VGA_CONSOLE)

arch/xtensa/kernel/time.c

@@ -14,7 +14,7 @@
 
 #include <linux/errno.h>
 #include <linux/time.h>
-#include <linux/timex.h>
+#include <linux/clocksource.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/init.h>
@@ -25,27 +25,31 @@
 #include <asm/timex.h>
 #include <asm/platform.h>
 
-
-DEFINE_SPINLOCK(rtc_lock);
-EXPORT_SYMBOL(rtc_lock);
-
-
 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
 unsigned long ccount_per_jiffy;		/* per 1/HZ */
 unsigned long nsec_per_ccount;		/* nsec per ccount increment */
 #endif
 
-static long last_rtc_update = 0;
-
-/*
- * Scheduler clock - returns current tim in nanosec units.
- */
-
-unsigned long long sched_clock(void)
+static cycle_t ccount_read(void)
 {
-	return (unsigned long long)jiffies * (1000000000 / HZ);
+	return (cycle_t)get_ccount();
 }
 
+static struct clocksource ccount_clocksource = {
+	.name = "ccount",
+	.rating = 200,
+	.read = ccount_read,
+	.mask = CLOCKSOURCE_MASK(32),
+	/*
+	 * With a shift of 22 the lower limit of the cpu clock is
+	 * 1MHz, where NSEC_PER_CCOUNT is 1000 or a bit less than
+	 * 2^10: Since we have 32 bits and the multiplicator can
+	 * already take up as much as 10 bits, this leaves us with
+	 * remaining upper 22 bits.
+	 */
+	.shift = 22,
+};
+
 static irqreturn_t timer_interrupt(int irq, void *dev_id);
 static struct irqaction timer_irqaction = {
 	.handler =	timer_interrupt,
@@ -55,11 +59,11 @@ static struct irqaction timer_irqaction = {
 
 void __init time_init(void)
 {
-	time_t sec_o, sec_n = 0;
+	xtime.tv_nsec = 0;
+	xtime.tv_sec = read_persistent_clock();
 
-	/* The platform must provide a function to calibrate the processor
-	 * speed for the CALIBRATE.
-	 */
+	set_normalized_timespec(&wall_to_monotonic,
+		-xtime.tv_sec, -xtime.tv_nsec);
 
 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
 	printk("Calibrating CPU frequency ");
@@ -67,19 +71,10 @@ void __init time_init(void)
 	printk("%d.%02d MHz\n", (int)ccount_per_jiffy/(1000000/HZ),
 			(int)(ccount_per_jiffy/(10000/HZ))%100);
 #endif
-
-	/* Set time from RTC (if provided) */
-
-	if (platform_get_rtc_time(&sec_o) == 0)
-		while (platform_get_rtc_time(&sec_n))
-			if (sec_o != sec_n)
-				break;
-
-	xtime.tv_nsec = 0;
-	last_rtc_update = xtime.tv_sec = sec_n;
-
-	set_normalized_timespec(&wall_to_monotonic,
-		-xtime.tv_sec, -xtime.tv_nsec);
+	ccount_clocksource.mult =
+		clocksource_hz2mult(CCOUNT_PER_JIFFY * HZ,
+				ccount_clocksource.shift);
+	clocksource_register(&ccount_clocksource);
 
 	/* Initialize the linux timer interrupt. */
 
@@ -87,69 +82,6 @@ void __init time_init(void)
 	set_linux_timer(get_ccount() + CCOUNT_PER_JIFFY);
 }
 
-
-int do_settimeofday(struct timespec *tv)
-{
-	time_t wtm_sec, sec = tv->tv_sec;
-	long wtm_nsec, nsec = tv->tv_nsec;
-	unsigned long delta;
-
-	if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
-		return -EINVAL;
-
-	write_seqlock_irq(&xtime_lock);
-
-	/* This is revolting. We need to set "xtime" correctly. However, the
-	 * value in this location is the value at the most recent update of
-	 * wall time.  Discover what correction gettimeofday() would have
-	 * made, and then undo it!
-	 */
-
-	delta = CCOUNT_PER_JIFFY;
-	delta += get_ccount() - get_linux_timer();
-	nsec -= delta * NSEC_PER_CCOUNT;
-
-	wtm_sec  = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
-	wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
-
-	set_normalized_timespec(&xtime, sec, nsec);
-	set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
-
-	ntp_clear();
-	write_sequnlock_irq(&xtime_lock);
-	return 0;
-}
-
-EXPORT_SYMBOL(do_settimeofday);
-
-
-void do_gettimeofday(struct timeval *tv)
-{
-	unsigned long flags;
-	unsigned long volatile sec, usec, delta, seq;
-
-	do {
-		seq = read_seqbegin_irqsave(&xtime_lock, flags);
-
-		sec = xtime.tv_sec;
-		usec = (xtime.tv_nsec / NSEC_PER_USEC);
-
-		delta = get_linux_timer() - get_ccount();
-
-	} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
-
-	usec += (((unsigned long) CCOUNT_PER_JIFFY - delta)
-		 * (unsigned long) NSEC_PER_CCOUNT) / NSEC_PER_USEC;
-
-	for (; usec >= 1000000; sec++, usec -= 1000000)
-		;
-
-	tv->tv_sec = sec;
-	tv->tv_usec = usec;
-}
-
-EXPORT_SYMBOL(do_gettimeofday);
-
 /*
  * The timer interrupt is called HZ times per second.
  */
@@ -178,16 +110,6 @@ irqreturn_t timer_interrupt (int irq, void *dev_id)
 		next += CCOUNT_PER_JIFFY;
 		set_linux_timer(next);
 
-		if (ntp_synced() &&
-		    xtime.tv_sec - last_rtc_update >= 659 &&
-		    abs((xtime.tv_nsec/1000)-(1000000-1000000/HZ))<5000000/HZ) {
-
-			if (platform_set_rtc_time(xtime.tv_sec+1) == 0)
-				last_rtc_update = xtime.tv_sec+1;
-			else
-				/* Do it again in 60 s */
-				last_rtc_update += 60;
-		}
 		write_sequnlock(&xtime_lock);
 	}
 
@@ -213,4 +135,3 @@ void __cpuinit calibrate_delay(void)
 	       (loops_per_jiffy/(10000/HZ)) % 100);
 }
 #endif
-

arch/xtensa/kernel/traps.c

@@ -104,6 +104,7 @@ static dispatch_init_table_t __initdata dispatch_init_table[] = {
 #endif
 { EXCCAUSE_UNALIGNED,		KRNL,	   fast_unaligned },
 #endif
+#ifdef CONFIG_MMU
 { EXCCAUSE_ITLB_MISS,		0,	   do_page_fault },
 { EXCCAUSE_ITLB_MISS,		USER|KRNL, fast_second_level_miss},
 { EXCCAUSE_ITLB_MULTIHIT,		0,	   do_multihit },
@@ -118,6 +119,7 @@ static dispatch_init_table_t __initdata dispatch_init_table[] = {
 { EXCCAUSE_STORE_CACHE_ATTRIBUTE,	USER|KRNL, fast_store_prohibited },
 { EXCCAUSE_STORE_CACHE_ATTRIBUTE,	0,	   do_page_fault },
 { EXCCAUSE_LOAD_CACHE_ATTRIBUTE,	0,	   do_page_fault },
+#endif /* CONFIG_MMU */
 /* XCCHAL_EXCCAUSE_FLOATING_POINT unhandled */
 #if XTENSA_HAVE_COPROCESSOR(0)
 COPROCESSOR(0),
@@ -372,11 +374,10 @@ void show_trace(struct task_struct *task, unsigned long *sp)
 	unsigned long a0, a1, pc;
 	unsigned long sp_start, sp_end;
 
-	a1 = (unsigned long)sp;
-
-	if (a1 == 0)
-		__asm__ __volatile__ ("mov %0, a1\n" : "=a"(a1));
-
+	if (sp)
+		a1 = (unsigned long)sp;
+	else
+		a1 = task->thread.sp;
 
 	sp_start = a1 & ~(THREAD_SIZE-1);
 	sp_end = sp_start + THREAD_SIZE;
@@ -418,9 +419,8 @@ void show_stack(struct task_struct *task, unsigned long *sp)
 	int i = 0;
 	unsigned long *stack;
 
-	if (sp == 0)
-		__asm__ __volatile__ ("mov %0, a1\n" : "=a"(sp));
-
+	if (!sp)
+		sp = (unsigned long *)task->thread.sp;
  	stack = sp;
 
 	printk("\nStack: ");

arch/xtensa/kernel/vectors.S

@@ -309,6 +309,7 @@ ENTRY(_DoubleExceptionVector)
 	 * All other exceptions are unexpected and thus unrecoverable!
 	 */
 
+#ifdef CONFIG_MMU
 	.extern fast_second_level_miss_double_kernel
 
 .Lksp:	/* a0: a0, a1: a1, a2: a2, a3: trashed, depc: depc, excsave: a3 */
@@ -319,6 +320,9 @@ ENTRY(_DoubleExceptionVector)
 	bnez	a3, .Lunrecoverable
 1:	movi	a3, fast_second_level_miss_double_kernel
 	jx	a3
+#else
+.equ	.Lksp,	.Lunrecoverable
+#endif
 
 	/* Critical! We can't handle this situation. PANIC! */
 

arch/xtensa/kernel/vmlinux.lds.S

@@ -17,6 +17,7 @@
 #include <asm-generic/vmlinux.lds.h>
 
 #include <variant/core.h>
+#include <platform/hardware.h>
 OUTPUT_ARCH(xtensa)
 ENTRY(_start)
 
@@ -26,7 +27,9 @@ jiffies = jiffies_64 + 4;
 jiffies = jiffies_64;
 #endif
 
+#ifndef KERNELOFFSET
 #define KERNELOFFSET 0xd0001000
+#endif
 
 /* Note: In the following macros, it would be nice to specify only the
    vector name and section kind and construct "sym" and "section" using

arch/xtensa/mm/Makefile

@@ -2,4 +2,5 @@
 # Makefile for the Linux/Xtensa-specific parts of the memory manager.
 #
 
-obj-y	 := init.o fault.o tlb.o misc.o cache.o
+obj-y			:= init.o cache.o misc.o
+obj-$(CONFIG_MMU)	+= fault.o mmu.o tlb.o

arch/xtensa/mm/init.c

@@ -24,15 +24,8 @@
 #include <linux/mm.h>
 #include <linux/slab.h>
 
-#include <asm/pgtable.h>
 #include <asm/bootparam.h>
-#include <asm/mmu_context.h>
-#include <asm/tlb.h>
 #include <asm/page.h>
-#include <asm/pgalloc.h>
-
-
-DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 
 /* References to section boundaries */
 
@@ -130,7 +123,8 @@ void __init bootmem_init(void)
 
 	/* Find an area to use for the bootmem bitmap. */
 
-	bootmap_size = bootmem_bootmap_pages(max_low_pfn) << PAGE_SHIFT;
+	bootmap_size = bootmem_bootmap_pages(max_low_pfn - min_low_pfn);
+	bootmap_size <<= PAGE_SHIFT;
 	bootmap_start = ~0;
 
 	for (i=0; i<sysmem.nr_banks; i++)
@@ -145,8 +139,9 @@ void __init bootmem_init(void)
 	/* Reserve the bootmem bitmap area */
 
 	mem_reserve(bootmap_start, bootmap_start + bootmap_size, 1);
-	bootmap_size = init_bootmem_node(NODE_DATA(0), min_low_pfn,
+	bootmap_size = init_bootmem_node(NODE_DATA(0),
 					 bootmap_start >> PAGE_SHIFT,
+					 min_low_pfn,
 					 max_low_pfn);
 
 	/* Add all remaining memory pieces into the bootmem map */
@@ -158,14 +153,14 @@ void __init bootmem_init(void)
 }
 
 
-void __init paging_init(void)
+void __init zones_init(void)
 {
 	unsigned long zones_size[MAX_NR_ZONES];
 	int i;
 
 	/* All pages are DMA-able, so we put them all in the DMA zone. */
 
-	zones_size[ZONE_DMA] = max_low_pfn;
+	zones_size[ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET;
 	for (i = 1; i < MAX_NR_ZONES; i++)
 		zones_size[i] = 0;
 
@@ -173,40 +168,7 @@ void __init paging_init(void)
 	zones_size[ZONE_HIGHMEM] = max_pfn - max_low_pfn;
 #endif
 
-	/* Initialize the kernel's page tables. */
-
-	memset(swapper_pg_dir, 0, PAGE_SIZE);
-
-	free_area_init(zones_size);
-}
-
-/*
- * Flush the mmu and reset associated register to default values.
- */
-
-void __init init_mmu (void)
-{
-	/* Writing zeros to the <t>TLBCFG special registers ensure
-	 * that valid values exist in the register.  For existing
-	 * PGSZID<w> fields, zero selects the first element of the
-	 * page-size array.  For nonexistent PGSZID<w> fields, zero is
-	 * the best value to write.  Also, when changing PGSZID<w>
-	 * fields, the corresponding TLB must be flushed.
-	 */
-	set_itlbcfg_register (0);
-	set_dtlbcfg_register (0);
-	flush_tlb_all ();
-
-	/* Set rasid register to a known value. */
-
-	set_rasid_register (ASID_USER_FIRST);
-
-	/* Set PTEVADDR special register to the start of the page
-	 * table, which is in kernel mappable space (ie. not
-	 * statically mapped).  This register's value is undefined on
-	 * reset.
-	 */
-	set_ptevaddr_register (PGTABLE_START);
+	free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL);
 }
 
 /*
@@ -218,8 +180,8 @@ void __init mem_init(void)
 	unsigned long codesize, reservedpages, datasize, initsize;
 	unsigned long highmemsize, tmp, ram;
 
-	max_mapnr = num_physpages = max_low_pfn;
-	high_memory = (void *) __va(max_mapnr << PAGE_SHIFT);
+	max_mapnr = num_physpages = max_low_pfn - ARCH_PFN_OFFSET;
+	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
 	highmemsize = 0;
 
 #ifdef CONFIG_HIGHMEM
@@ -229,7 +191,7 @@ void __init mem_init(void)
 	totalram_pages += free_all_bootmem();
 
 	reservedpages = ram = 0;
-	for (tmp = 0; tmp < max_low_pfn; tmp++) {
+	for (tmp = 0; tmp < max_mapnr; tmp++) {
 		ram++;
 		if (PageReserved(mem_map+tmp))
 			reservedpages++;
@@ -279,23 +241,3 @@ void free_initmem(void)
 	printk("Freeing unused kernel memory: %dk freed\n",
 	       (&__init_end - &__init_begin) >> 10);
 }
-
-struct kmem_cache *pgtable_cache __read_mostly;
-
-static void pgd_ctor(void* addr)
-{
-	pte_t* ptep = (pte_t*)addr;
-	int i;
-
-	for (i = 0; i < 1024; i++, ptep++)
-		pte_clear(NULL, 0, ptep);
-
-}
-
-void __init pgtable_cache_init(void)
-{
-	pgtable_cache = kmem_cache_create("pgd",
-			PAGE_SIZE, PAGE_SIZE,
-			SLAB_HWCACHE_ALIGN,
-			pgd_ctor);
-}

arch/xtensa/mm/misc.S

@@ -84,6 +84,7 @@ ENTRY(copy_page)
 
 	retw
 
+#ifdef CONFIG_MMU
 /*
  * If we have to deal with cache aliasing, we use temporary memory mappings
  * to ensure that the source and destination pages have the same color as
@@ -311,6 +312,7 @@ ENTRY(__invalidate_icache_page_alias)
 /* End of special treatment in tlb miss exception */
 
 ENTRY(__tlbtemp_mapping_end)
+#endif /* CONFIG_MMU
 
 /*
  * void __invalidate_icache_page(ulong start)

arch/xtensa/mm/mmu.c

+/*
+ * xtensa mmu stuff
+ *
+ * Extracted from init.c
+ */
+#include <linux/percpu.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/cache.h>
+
+#include <asm/tlb.h>
+#include <asm/tlbflush.h>
+#include <asm/mmu_context.h>
+#include <asm/page.h>
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+void __init paging_init(void)
+{
+	memset(swapper_pg_dir, 0, PAGE_SIZE);
+}
+
+/*
+ * Flush the mmu and reset associated register to default values.
+ */
+void __init init_mmu(void)
+{
+	/* Writing zeros to the <t>TLBCFG special registers ensure
+	 * that valid values exist in the register.  For existing
+	 * PGSZID<w> fields, zero selects the first element of the
+	 * page-size array.  For nonexistent PGSZID<w> fields, zero is
+	 * the best value to write.  Also, when changing PGSZID<w>
+	 * fields, the corresponding TLB must be flushed.
+	 */
+	set_itlbcfg_register(0);
+	set_dtlbcfg_register(0);
+	flush_tlb_all();
+
+	/* Set rasid register to a known value. */
+
+	set_rasid_register(ASID_USER_FIRST);
+
+	/* Set PTEVADDR special register to the start of the page
+	 * table, which is in kernel mappable space (ie. not
+	 * statically mapped).  This register's value is undefined on
+	 * reset.
+	 */
+	set_ptevaddr_register(PGTABLE_START);
+}
+
+struct kmem_cache *pgtable_cache __read_mostly;
+
+static void pgd_ctor(void *addr)
+{
+	pte_t *ptep = (pte_t *)addr;
+	int i;
+
+	for (i = 0; i < 1024; i++, ptep++)
+		pte_clear(NULL, 0, ptep);
+
+}
+
+void __init pgtable_cache_init(void)
+{
+	pgtable_cache = kmem_cache_create("pgd",
+			PAGE_SIZE, PAGE_SIZE,
+			SLAB_HWCACHE_ALIGN,
+			pgd_ctor);
+}

arch/xtensa/platforms/s6105/Makefile

+# Makefile for the Stretch S6105 eval board
+
+obj-y		:= setup.o device.o

arch/xtensa/platforms/s6105/device.c

+/*
+ * s6105 platform devices
+ *
+ * Copyright (c) 2009 emlix GmbH
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/serial.h>
+#include <linux/serial_8250.h>
+
+#include <variant/hardware.h>
+
+#define UART_INTNUM		4
+
+static const signed char uart_irq_mappings[] = {
+	S6_INTC_UART(0),
+	S6_INTC_UART(1),
+	-1,
+};
+
+const signed char *platform_irq_mappings[NR_IRQS] = {
+	[UART_INTNUM] = uart_irq_mappings,
+};
+
+static struct plat_serial8250_port serial_platform_data[] = {
+	{
+		.membase = (void *)S6_REG_UART + 0x0000,
+		.mapbase = S6_REG_UART + 0x0000,
+		.irq = UART_INTNUM,
+		.uartclk = S6_SCLK,
+		.regshift = 2,
+		.iotype = SERIAL_IO_MEM,
+		.flags = ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST,
+	},
+	{
+		.membase = (void *)S6_REG_UART + 0x1000,
+		.mapbase = S6_REG_UART + 0x1000,
+		.irq = UART_INTNUM,
+		.uartclk = S6_SCLK,
+		.regshift = 2,
+		.iotype = SERIAL_IO_MEM,
+		.flags = ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST,
+	},
+	{ },
+};
+
+static struct platform_device platform_devices[] = {
+	{
+		.name = "serial8250",
+		.id = PLAT8250_DEV_PLATFORM,
+		.dev = {
+			.platform_data = serial_platform_data,
+		},
+	},
+};
+
+static int __init device_init(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(platform_devices); i++)
+		platform_device_register(&platform_devices[i]);
+	return 0;
+}
+arch_initcall_sync(device_init);

arch/xtensa/platforms/s6105/include/platform/gpio.h

+#ifndef __ASM_XTENSA_S6105_GPIO_H
+#define __ASM_XTENSA_S6105_GPIO_H
+
+#define GPIO_BP_TEMP_ALARM	0
+#define GPIO_PB_RESET_IN	1
+#define GPIO_EXP_IRQ		2
+#define GPIO_TRIGGER_IRQ	3
+#define GPIO_RTC_IRQ		4
+#define GPIO_PHY_IRQ		5
+#define GPIO_IMAGER_RESET	6
+#define GPIO_SD_IRQ		7
+#define GPIO_MINI_BOOT_INH	8
+#define GPIO_BOARD_RESET	9
+#define GPIO_EXP_PRESENT	10
+#define GPIO_LED1_NGREEN	12
+#define GPIO_LED1_RED		13
+#define GPIO_LED0_NGREEN	14
+#define GPIO_LED0_NRED		15
+#define GPIO_SPI_CS0		16
+#define GPIO_SPI_CS1		17
+#define GPIO_SPI_CS3		19
+#define GPIO_SPI_CS4		20
+#define GPIO_SD_WP		21
+#define GPIO_BP_RESET		22
+#define GPIO_ALARM_OUT		23
+
+#endif /* __ASM_XTENSA_S6105_GPIO_H */

arch/xtensa/platforms/s6105/include/platform/hardware.h

+#ifndef __XTENSA_S6105_HARDWARE_H
+#define __XTENSA_S6105_HARDWARE_H
+
+#define PLATFORM_DEFAULT_MEM_START	0x40000000
+#define PLATFORM_DEFAULT_MEM_SIZE	0x08000000
+
+#define MAX_DMA_ADDRESS			0
+
+#define KERNELOFFSET			(PLATFORM_DEFAULT_MEM_START + 0x1000)
+
+#endif /* __XTENSA_S6105_HARDWARE_H */

arch/xtensa/platforms/s6105/include/platform/serial.h

+#ifndef __ASM_XTENSA_S6105_SERIAL_H
+#define __ASM_XTENSA_S6105_SERIAL_H
+
+#include <variant/hardware.h>
+
+#define BASE_BAUD (S6_SCLK / 16)
+
+#endif /* __ASM_XTENSA_S6105_SERIAL_H */

arch/xtensa/platforms/s6105/setup.c

+/*
+ * s6105 control routines
+ *
+ * Copyright (c) 2009 emlix GmbH
+ */
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+
+#include <asm/bootparam.h>
+
+#include <variant/hardware.h>
+#include <platform/gpio.h>
+
+void platform_halt(void)
+{
+	local_irq_disable();
+	while (1)
+		;
+}
+
+void platform_power_off(void)
+{
+	platform_halt();
+}
+
+void platform_restart(void)
+{
+	platform_halt();
+}
+
+void __init platform_setup(char **cmdline)
+{
+	unsigned long reg;
+
+	reg = readl(S6_REG_GREG1 + S6_GREG1_CLKGATE);
+	reg &= ~(1 << S6_GREG1_BLOCK_SB);
+	writel(reg, S6_REG_GREG1 + S6_GREG1_CLKGATE);
+
+	reg = readl(S6_REG_GREG1 + S6_GREG1_BLOCKENA);
+	reg |= 1 << S6_GREG1_BLOCK_SB;
+	writel(reg, S6_REG_GREG1 + S6_GREG1_BLOCKENA);
+
+	printk(KERN_NOTICE "S6105 on Stretch S6000 - "
+		"Copyright (C) 2009 emlix GmbH <info@emlix.com>\n");
+}
+
+void __init platform_init(bp_tag_t *first)
+{
+	gpio_request(GPIO_LED1_NGREEN, "led1_green");
+	gpio_request(GPIO_LED1_RED, "led1_red");
+	gpio_direction_output(GPIO_LED1_NGREEN, 1);
+}
+
+void platform_heartbeat(void)
+{
+	static unsigned int c;
+
+	if (!(++c & 0x4F))
+		gpio_direction_output(GPIO_LED1_RED, !(c & 0x10));
+}

arch/xtensa/platforms/xt2000/include/platform/hardware.h

@@ -16,7 +16,6 @@
 #define _XTENSA_XT2000_HARDWARE_H
 
 #include <variant/core.h>
-#include <asm/io.h>
 
 /* 
  * Memory configuration.

arch/xtensa/variants/s6000/Makefile

+# s6000 Makefile
+
+obj-y		+= irq.o gpio.o

arch/xtensa/variants/s6000/gpio.c

+/*
+ * s6000 gpio driver
+ *
+ * Copyright (c) 2009 emlix GmbH
+ * Authors:	Oskar Schirmer <os@emlix.com>
+ *		Johannes Weiner <jw@emlix.com>
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+
+#include <variant/hardware.h>
+
+#define S6_GPIO_DATA		0x000
+#define S6_GPIO_IS		0x404
+#define S6_GPIO_IBE		0x408
+#define S6_GPIO_IEV		0x40C
+#define S6_GPIO_IE		0x410
+#define S6_GPIO_RIS		0x414
+#define S6_GPIO_MIS		0x418
+#define S6_GPIO_IC		0x41C
+#define S6_GPIO_AFSEL		0x420
+#define S6_GPIO_DIR		0x800
+#define S6_GPIO_BANK(nr)	((nr) * 0x1000)
+#define S6_GPIO_MASK(nr)	(4 << (nr))
+#define S6_GPIO_OFFSET(nr) \
+		(S6_GPIO_BANK((nr) >> 3) + S6_GPIO_MASK((nr) & 7))
+
+static int direction_input(struct gpio_chip *chip, unsigned int off)
+{
+	writeb(0, S6_REG_GPIO + S6_GPIO_DIR + S6_GPIO_OFFSET(off));
+	return 0;
+}
+
+static int get(struct gpio_chip *chip, unsigned int off)
+{
+	return readb(S6_REG_GPIO + S6_GPIO_DATA + S6_GPIO_OFFSET(off));
+}
+
+static int direction_output(struct gpio_chip *chip, unsigned int off, int val)
+{
+	unsigned rel = S6_GPIO_OFFSET(off);
+	writeb(~0, S6_REG_GPIO + S6_GPIO_DIR + rel);
+	writeb(val ? ~0 : 0, S6_REG_GPIO + S6_GPIO_DATA + rel);
+	return 0;
+}
+
+static void set(struct gpio_chip *chip, unsigned int off, int val)
+{
+	writeb(val ? ~0 : 0, S6_REG_GPIO + S6_GPIO_DATA + S6_GPIO_OFFSET(off));
+}
+
+static struct gpio_chip gpiochip = {
+	.owner = THIS_MODULE,
+	.direction_input = direction_input,
+	.get = get,
+	.direction_output = direction_output,
+	.set = set,
+	.base = 0,
+	.ngpio = 24,
+	.can_sleep = 0, /* no blocking io needed */
+	.exported = 0, /* no exporting to userspace */
+};
+
+static int gpio_init(void)
+{
+	return gpiochip_add(&gpiochip);
+}
+device_initcall(gpio_init);

arch/xtensa/variants/s6000/include/variant/hardware.h

+#ifndef __XTENSA_S6000_HARDWARE_H
+#define __XTENSA_S6000_HARDWARE_H
+
+#define S6_SCLK			1843200
+
+#define S6_MEM_REG              0x20000000
+#define S6_MEM_EFI              0x33F00000
+#define S6_MEM_PCIE_DATARAM1    0x34000000
+#define S6_MEM_XLMI             0x37F80000
+#define S6_MEM_PIF_DATARAM1     0x37FFC000
+#define S6_MEM_GMAC             0x38000000
+#define S6_MEM_I2S              0x3A000000
+#define S6_MEM_EGIB             0x3C000000
+#define S6_MEM_PCIE_CFG         0x3E000000
+#define S6_MEM_PIF_DATARAM      0x3FFE0000
+#define S6_MEM_XLMI_DATARAM     0x3FFF0000
+#define S6_MEM_DDR              0x40000000
+#define S6_MEM_PCIE_APER        0xC0000000
+#define S6_MEM_AUX              0xF0000000
+
+/* Device addresses */
+
+#define S6_REG_SCB              S6_MEM_REG
+#define S6_REG_NB               (S6_REG_SCB + 0x10000)
+#define S6_REG_LMSDMA           (S6_REG_SCB + 0x20000)
+#define S6_REG_NI               (S6_REG_SCB + 0x30000)
+#define S6_REG_NIDMA            (S6_REG_SCB + 0x40000)
+#define S6_REG_NS               (S6_REG_SCB + 0x50000)
+#define S6_REG_DDR              (S6_REG_SCB + 0x60000)
+#define S6_REG_GREG1            (S6_REG_SCB + 0x70000)
+#define S6_REG_DP               (S6_REG_SCB + 0x80000)
+#define S6_REG_DPDMA            (S6_REG_SCB + 0x90000)
+#define S6_REG_EGIB             (S6_REG_SCB + 0xA0000)
+#define S6_REG_PCIE             (S6_REG_SCB + 0xB0000)
+#define S6_REG_I2S              (S6_REG_SCB + 0xC0000)
+#define S6_REG_GMAC             (S6_REG_SCB + 0xD0000)
+#define S6_REG_HIFDMA           (S6_REG_SCB + 0xE0000)
+#define S6_REG_GREG2            (S6_REG_SCB + 0xF0000)
+
+#define S6_REG_APB              S6_REG_SCB
+#define S6_REG_UART             (S6_REG_APB + 0x0000)
+#define S6_REG_INTC             (S6_REG_APB + 0x2000)
+#define S6_REG_SPI              (S6_REG_APB + 0x3000)
+#define S6_REG_I2C              (S6_REG_APB + 0x4000)
+#define S6_REG_GPIO             (S6_REG_APB + 0x8000)
+
+/* Global register block */
+
+#define S6_GREG1_PLL_LOCKCLEAR	0x000
+#define S6_GREG1_PLL_LOCK_SYS		0
+#define S6_GREG1_PLL_LOCK_IO		1
+#define S6_GREG1_PLL_LOCK_AIM		2
+#define S6_GREG1_PLL_LOCK_DP0		3
+#define S6_GREG1_PLL_LOCK_DP2		4
+#define S6_GREG1_PLL_LOCK_DDR		5
+#define S6_GREG1_PLL_LOCKSTAT	0x004
+#define S6_GREG1_PLL_LOCKSTAT_CURLOCK	0
+#define S6_GREG1_PLL_LOCKSTAT_EVERUNLCK	8
+#define S6_GREG1_PLLSEL		0x010
+#define S6_GREG1_PLLSEL_AIM		0
+#define S6_GREG1_PLLSEL_AIM_DDR2		0
+#define S6_GREG1_PLLSEL_AIM_300MHZ		1
+#define S6_GREG1_PLLSEL_AIM_240MHZ		2
+#define S6_GREG1_PLLSEL_AIM_200MHZ		3
+#define S6_GREG1_PLLSEL_AIM_150MHZ		4
+#define S6_GREG1_PLLSEL_AIM_120MHZ		5
+#define S6_GREG1_PLLSEL_AIM_40MHZ		6
+#define S6_GREG1_PLLSEL_AIM_PLLAIMREF		7
+#define S6_GREG1_PLLSEL_AIM_MASK		7
+#define S6_GREG1_PLLSEL_DDR		8
+#define S6_GREG1_PLLSEL_DDR_HS			0
+#define S6_GREG1_PLLSEL_DDR_333MHZ		1
+#define S6_GREG1_PLLSEL_DDR_250MHZ		2
+#define S6_GREG1_PLLSEL_DDR_200MHZ		3
+#define S6_GREG1_PLLSEL_DDR_167MHZ		4
+#define S6_GREG1_PLLSEL_DDR_100MHZ		5
+#define S6_GREG1_PLLSEL_DDR_33MHZ		6
+#define S6_GREG1_PLLSEL_DDR_PLLIOREF		7
+#define S6_GREG1_PLLSEL_DDR_MASK		7
+#define S6_GREG1_PLLSEL_GMAC		16
+#define S6_GREG1_PLLSEL_GMAC_125MHZ		0
+#define S6_GREG1_PLLSEL_GMAC_25MHZ		1
+#define S6_GREG1_PLLSEL_GMAC_2500KHZ		2
+#define S6_GREG1_PLLSEL_GMAC_EXTERN		3
+#define S6_GREG1_PLLSEL_GMAC_MASK		3
+#define S6_GREG1_PLLSEL_GMII		18
+#define S6_GREG1_PLLSEL_GMII_111MHZ		0
+#define S6_GREG1_PLLSEL_GMII_IOREF		1
+#define S6_GREG1_PLLSEL_GMII_NONE		2
+#define S6_GREG1_PLLSEL_GMII_125MHZ		3
+#define S6_GREG1_PLLSEL_GMII_MASK		3
+#define S6_GREG1_SYSUNLOCKCNT	0x020
+#define S6_GREG1_IOUNLOCKCNT	0x024
+#define S6_GREG1_AIMUNLOCKCNT	0x028
+#define S6_GREG1_DP0UNLOCKCNT	0x02C
+#define S6_GREG1_DP2UNLOCKCNT	0x030
+#define S6_GREG1_DDRUNLOCKCNT	0x034
+#define S6_GREG1_CLKBAL0	0x040
+#define S6_GREG1_CLKBAL0_LSGB		0
+#define S6_GREG1_CLKBAL0_LSPX		8
+#define S6_GREG1_CLKBAL0_MEMDO		16
+#define S6_GREG1_CLKBAL0_HSXT1		24
+#define S6_GREG1_CLKBAL1	0x044
+#define S6_GREG1_CLKBAL1_HSISEF		0
+#define S6_GREG1_CLKBAL1_HSNI		8
+#define S6_GREG1_CLKBAL1_HSNS		16
+#define S6_GREG1_CLKBAL1_HSISEFCFG	24
+#define S6_GREG1_CLKBAL2	0x048
+#define S6_GREG1_CLKBAL2_LSNB		0
+#define S6_GREG1_CLKBAL2_LSSB		8
+#define S6_GREG1_CLKBAL2_LSREST		24
+#define S6_GREG1_CLKBAL3	0x04C
+#define S6_GREG1_CLKBAL3_ISEFXAD	0
+#define S6_GREG1_CLKBAL3_ISEFLMS	8
+#define S6_GREG1_CLKBAL3_ISEFISEF	16
+#define S6_GREG1_CLKBAL3_DDRDD		24
+#define S6_GREG1_CLKBAL4	0x050
+#define S6_GREG1_CLKBAL4_DDRDP		0
+#define S6_GREG1_CLKBAL4_DDRDO		8
+#define S6_GREG1_CLKBAL4_DDRNB		16
+#define S6_GREG1_CLKBAL4_DDRLMS		24
+#define S6_GREG1_BLOCKENA	0x100
+#define S6_GREG1_BLOCK_DDR		0
+#define S6_GREG1_BLOCK_DP		1
+#define S6_GREG1_BLOCK_NSNI		2
+#define S6_GREG1_BLOCK_PCIE		3
+#define S6_GREG1_BLOCK_GMAC		4
+#define S6_GREG1_BLOCK_I2S		5
+#define S6_GREG1_BLOCK_EGIB		6
+#define S6_GREG1_BLOCK_SB		7
+#define S6_GREG1_BLOCK_XT1		8
+#define S6_GREG1_CLKGATE	0x104
+#define S6_GREG1_BGATE_AIMNORTH		9
+#define S6_GREG1_BGATE_AIMEAST		10
+#define S6_GREG1_BGATE_AIMWEST		11
+#define S6_GREG1_BGATE_AIMSOUTH		12
+#define S6_GREG1_CHIPRES	0x108
+#define S6_GREG1_CHIPRES_SOFTRES	0
+#define S6_GREG1_CHIPRES_LOSTLOCK	1
+#define S6_GREG1_RESETCAUSE	0x10C
+#define S6_GREG1_RESETCAUSE_RESETN	0
+#define S6_GREG1_RESETCAUSE_GLOBAL	1
+#define S6_GREG1_RESETCAUSE_WDOGTIMER	2
+#define S6_GREG1_RESETCAUSE_SWCHIP	3
+#define S6_GREG1_RESETCAUSE_PLLSYSLOSS	4
+#define S6_GREG1_RESETCAUSE_PCIE	5
+#define S6_GREG1_RESETCAUSE_CREATEDGLOB	6
+#define S6_GREG1_REFCLOCKCNT	0x110
+#define S6_GREG1_RESETTIMER	0x114
+#define S6_GREG1_NMITIMER	0x118
+#define S6_GREG1_GLOBAL_TIMER	0x11C
+#define S6_GREG1_TIMER0		0x180
+#define S6_GREG1_TIMER1		0x184
+#define S6_GREG1_UARTCLOCKSEL	0x204
+#define S6_GREG1_CHIPVERSPACKG	0x208
+#define S6_GREG1_CHIPVERSPACKG_CHIPVID	0
+#define S6_GREG1_CHIPVERSPACKG_PACKSEL	8
+#define S6_GREG1_ONDIETERMCTRL	0x20C
+#define S6_GREG1_ONDIETERMCTRL_WEST	0
+#define S6_GREG1_ONDIETERMCTRL_NORTH	2
+#define S6_GREG1_ONDIETERMCTRL_EAST	4
+#define S6_GREG1_ONDIETERMCTRL_SOUTH	6
+#define S6_GREG1_ONDIETERMCTRL_NONE		0
+#define S6_GREG1_ONDIETERMCTRL_75OHM		2
+#define S6_GREG1_ONDIETERMCTRL_MASK		3
+#define S6_GREG1_BOOT_CFG0	0x210
+#define S6_GREG1_BOOT_CFG0_AIMSTRONG	1
+#define S6_GREG1_BOOT_CFG0_MINIBOOTDL	2
+#define S6_GREG1_BOOT_CFG0_OCDGPIO8SET	5
+#define S6_GREG1_BOOT_CFG0_OCDGPIOENA	6
+#define S6_GREG1_BOOT_CFG0_DOWNSTREAM	7
+#define S6_GREG1_BOOT_CFG0_PLLSYSDIV	8
+#define S6_GREG1_BOOT_CFG0_PLLSYSDIV_300MHZ	1
+#define S6_GREG1_BOOT_CFG0_PLLSYSDIV_240MHZ	2
+#define S6_GREG1_BOOT_CFG0_PLLSYSDIV_200MHZ	3
+#define S6_GREG1_BOOT_CFG0_PLLSYSDIV_150MHZ	4
+#define S6_GREG1_BOOT_CFG0_PLLSYSDIV_120MHZ	5
+#define S6_GREG1_BOOT_CFG0_PLLSYSDIV_40MHZ	6
+#define S6_GREG1_BOOT_CFG0_PLLSYSDIV_MASK	7
+#define S6_GREG1_BOOT_CFG0_BALHSLMS	12
+#define S6_GREG1_BOOT_CFG0_BALHSNB	18
+#define S6_GREG1_BOOT_CFG0_BALHSXAD	24
+#define S6_GREG1_BOOT_CFG1	0x214
+#define S6_GREG1_BOOT_CFG1_PCIE1LANE	1
+#define S6_GREG1_BOOT_CFG1_MPLLPRESCALE	2
+#define S6_GREG1_BOOT_CFG1_MPLLNCY	4
+#define S6_GREG1_BOOT_CFG1_MPLLNCY5	9
+#define S6_GREG1_BOOT_CFG1_BALHSREST	14
+#define S6_GREG1_BOOT_CFG1_BALHSPSMEMS	20
+#define S6_GREG1_BOOT_CFG1_BALLSGI	26
+#define S6_GREG1_BOOT_CFG2	0x218
+#define S6_GREG1_BOOT_CFG2_PEID		0
+#define S6_GREG1_BOOT_CFG3	0x21C
+#define S6_GREG1_DRAMBUSYHOLDOF	0x220
+#define S6_GREG1_DRAMBUSYHOLDOF_XT0	0
+#define S6_GREG1_DRAMBUSYHOLDOF_XT1	4
+#define S6_GREG1_DRAMBUSYHOLDOF_XT_MASK		7
+#define S6_GREG1_PCIEBAR1SIZE	0x224
+#define S6_GREG1_PCIEBAR2SIZE	0x228
+#define S6_GREG1_PCIEVENDOR	0x22C
+#define S6_GREG1_PCIEDEVICE	0x230
+#define S6_GREG1_PCIEREV	0x234
+#define S6_GREG1_PCIECLASS	0x238
+#define S6_GREG1_XT1DCACHEMISS	0x240
+#define S6_GREG1_XT1ICACHEMISS	0x244
+#define S6_GREG1_HWSEMAPHORE(n)	(0x400 + 4 * (n))
+#define S6_GREG1_HWSEMAPHORE_NB		16
+
+/* peripheral interrupt numbers */
+
+#define S6_INTC_GPIO(n)			(n)		/* 0..3 */
+#define S6_INTC_I2C			4
+#define S6_INTC_SPI			5
+#define S6_INTC_NB_ERR			6
+#define S6_INTC_DMA_LMSERR		7
+#define S6_INTC_DMA_LMSLOWWMRK(n)	(8 + (n))	/* 0..11 */
+#define S6_INTC_DMA_LMSPENDCNT(n)	(20 + (n))	/* 0..11 */
+#define S6_INTC_DMA HOSTLOWWMRK(n)	(32 + (n))	/* 0..6 */
+#define S6_INTC_DMA_HOSTPENDCNT(n)	(39 + (n))	/* 0..6 */
+#define S6_INTC_DMA_HOSTERR		46
+#define S6_INTC_UART(n)			(47 + (n))	/* 0..1 */
+#define S6_INTC_XAD			49
+#define S6_INTC_NI_ERR			50
+#define S6_INTC_NI_INFIFOFULL		51
+#define S6_INTC_DMA_NIERR		52
+#define S6_INTC_DMA_NILOWWMRK(n)	(53 + (n))	/* 0..3 */
+#define S6_INTC_DMA_NIPENDCNT(n)	(57 + (n))	/* 0..3 */
+#define S6_INTC_DDR			61
+#define S6_INTC_NS_ERR			62
+#define S6_INTC_EFI_CFGERR		63
+#define S6_INTC_EFI_ISEFTEST		64
+#define S6_INTC_EFI_WRITEERR		65
+#define S6_INTC_NMI_TIMER		66
+#define S6_INTC_PLLLOCK_SYS		67
+#define S6_INTC_PLLLOCK_IO		68
+#define S6_INTC_PLLLOCK_AIM		69
+#define S6_INTC_PLLLOCK_DP0		70
+#define S6_INTC_PLLLOCK_DP2		71
+#define S6_INTC_I2S_ERR			72
+#define S6_INTC_GMAC_STAT		73
+#define S6_INTC_GMAC_ERR		74
+#define S6_INTC_GIB_ERR			75
+#define S6_INTC_PCIE_ERR		76
+#define S6_INTC_PCIE_MSI(n)		(77 + (n))	/* 0..3 */
+#define S6_INTC_PCIE_INTA		81
+#define S6_INTC_PCIE_INTB		82
+#define S6_INTC_PCIE_INTC		83
+#define S6_INTC_PCIE_INTD		84
+#define S6_INTC_SW(n)			(85 + (n))	/* 0..9 */
+#define S6_INTC_SW_ENABLE(n)		(85 + 256 + (n))
+#define S6_INTC_DMA_DP_ERR		95
+#define S6_INTC_DMA_DPLOWWMRK(n)	(96 + (n))	/* 0..3 */
+#define S6_INTC_DMA_DPPENDCNT(n)	(100 + (n))	/* 0..3 */
+#define S6_INTC_DMA_DPTERMCNT(n)	(104 + (n))	/* 0..3 */
+#define S6_INTC_TIMER0			108
+#define S6_INTC_TIMER1			109
+#define S6_INTC_DMA_HOSTTERMCNT(n)	(110 + (n))	/* 0..6 */
+
+#endif /* __XTENSA_S6000_HARDWARE_H */

arch/xtensa/variants/s6000/include/variant/irq.h

+#ifndef __XTENSA_S6000_IRQ_H
+#define __XTENSA_S6000_IRQ_H
+
+#define NO_IRQ		(-1)
+
+extern void variant_irq_enable(unsigned int irq);
+extern void variant_irq_disable(unsigned int irq);
+
+#endif /* __XTENSA_S6000_IRQ_H */

arch/xtensa/variants/s6000/include/variant/tie-asm.h

+/*
+ * This header file contains assembly-language definitions (assembly
+ * macros, etc.) for this specific Xtensa processor's TIE extensions
+ * and options.  It is customized to this Xtensa processor configuration.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1999-2008 Tensilica Inc.
+ */
+
+#ifndef _XTENSA_CORE_TIE_ASM_H
+#define _XTENSA_CORE_TIE_ASM_H
+
+/*  Selection parameter values for save-area save/restore macros:  */
+/*  Option vs. TIE:  */
+#define XTHAL_SAS_TIE	0x0001	/* custom extension or coprocessor */
+#define XTHAL_SAS_OPT	0x0002	/* optional (and not a coprocessor) */
+/*  Whether used automatically by compiler:  */
+#define XTHAL_SAS_NOCC	0x0004	/* not used by compiler w/o special opts/code */
+#define XTHAL_SAS_CC	0x0008	/* used by compiler without special opts/code */
+/*  ABI handling across function calls:  */
+#define XTHAL_SAS_CALR	0x0010	/* caller-saved */
+#define XTHAL_SAS_CALE	0x0020	/* callee-saved */
+#define XTHAL_SAS_GLOB	0x0040	/* global across function calls (in thread) */
+/*  Misc  */
+#define XTHAL_SAS_ALL	0xFFFF	/* include all default NCP contents */
+
+
+
+/* Macro to save all non-coprocessor (extra) custom TIE and optional state
+ * (not including zero-overhead loop registers).
+ * Save area ptr (clobbered):  ptr  (16 byte aligned)
+ * Scratch regs  (clobbered):  at1..at4  (only first XCHAL_NCP_NUM_ATMPS needed)
+ */
+	.macro xchal_ncp_store  ptr at1 at2 at3 at4  continue=0 ofs=-1 select=XTHAL_SAS_ALL
+	xchal_sa_start	\continue, \ofs
+	.ifeq (XTHAL_SAS_OPT | XTHAL_SAS_NOCC | XTHAL_SAS_CALR) & ~\select
+	xchal_sa_align	\ptr, 0, 1024-4, 4, 4
+	rsr	\at1, BR		// boolean option
+	s32i	\at1, \ptr, .Lxchal_ofs_ + 0
+	.set	.Lxchal_ofs_, .Lxchal_ofs_ + 4
+	.endif
+	.endm	// xchal_ncp_store
+
+/* Macro to save all non-coprocessor (extra) custom TIE and optional state
+ * (not including zero-overhead loop registers).
+ * Save area ptr (clobbered):  ptr  (16 byte aligned)
+ * Scratch regs  (clobbered):  at1..at4  (only first XCHAL_NCP_NUM_ATMPS needed)
+ */
+	.macro xchal_ncp_load  ptr at1 at2 at3 at4  continue=0 ofs=-1 select=XTHAL_SAS_ALL
+	xchal_sa_start	\continue, \ofs
+	.ifeq (XTHAL_SAS_OPT | XTHAL_SAS_NOCC | XTHAL_SAS_CALR) & ~\select
+	xchal_sa_align	\ptr, 0, 1024-4, 4, 4
+	l32i	\at1, \ptr, .Lxchal_ofs_ + 0
+	wsr	\at1, BR		// boolean option
+	.set	.Lxchal_ofs_, .Lxchal_ofs_ + 4
+	.endif
+	.endm	// xchal_ncp_load
+
+
+
+#define XCHAL_NCP_NUM_ATMPS	1
+
+
+
+/* Macro to save the state of TIE coprocessor FPU.
+ * Save area ptr (clobbered):  ptr  (16 byte aligned)
+ * Scratch regs  (clobbered):  at1..at4  (only first XCHAL_CP0_NUM_ATMPS needed)
+ */
+#define xchal_cp_FPU_store	xchal_cp0_store
+/* #define xchal_cp_FPU_store_a2	xchal_cp0_store a2 a3 a4 a5 a6 */
+	.macro	xchal_cp0_store  ptr at1 at2 at3 at4  continue=0 ofs=-1 select=XTHAL_SAS_ALL
+	xchal_sa_start \continue, \ofs
+	.ifeq (XTHAL_SAS_TIE | XTHAL_SAS_NOCC | XTHAL_SAS_CALR) & ~\select
+	xchal_sa_align	\ptr, 0, 0, 1, 16
+	rur232	\at1		// FCR
+	s32i	\at1, \ptr, 0
+	rur233	\at1		// FSR
+	s32i	\at1, \ptr, 4
+	SSI f0, \ptr,  8
+	SSI f1, \ptr,  12
+	SSI f2, \ptr,  16
+	SSI f3, \ptr,  20
+	SSI f4, \ptr,  24
+	SSI f5, \ptr,  28
+	SSI f6, \ptr,  32
+	SSI f7, \ptr,  36
+	SSI f8, \ptr,  40
+	SSI f9, \ptr,  44
+	SSI f10, \ptr,  48
+	SSI f11, \ptr,  52
+	SSI f12, \ptr,  56
+	SSI f13, \ptr,  60
+	SSI f14, \ptr,  64
+	SSI f15, \ptr,  68
+	.set	.Lxchal_ofs_, .Lxchal_ofs_ + 72
+	.endif
+	.endm	// xchal_cp0_store
+
+/* Macro to restore the state of TIE coprocessor FPU.
+ * Save area ptr (clobbered):  ptr  (16 byte aligned)
+ * Scratch regs  (clobbered):  at1..at4  (only first XCHAL_CP0_NUM_ATMPS needed)
+ */
+#define xchal_cp_FPU_load	xchal_cp0_load
+/* #define xchal_cp_FPU_load_a2	xchal_cp0_load a2 a3 a4 a5 a6 */
+	.macro	xchal_cp0_load  ptr at1 at2 at3 at4  continue=0 ofs=-1 select=XTHAL_SAS_ALL
+	xchal_sa_start \continue, \ofs
+	.ifeq (XTHAL_SAS_TIE | XTHAL_SAS_NOCC | XTHAL_SAS_CALR) & ~\select
+	xchal_sa_align	\ptr, 0, 0, 1, 16
+	l32i	\at1, \ptr, 0
+	wur232	\at1		// FCR
+	l32i	\at1, \ptr, 4
+	wur233	\at1		// FSR
+	LSI f0, \ptr,  8
+	LSI f1, \ptr,  12
+	LSI f2, \ptr,  16
+	LSI f3, \ptr,  20
+	LSI f4, \ptr,  24
+	LSI f5, \ptr,  28
+	LSI f6, \ptr,  32
+	LSI f7, \ptr,  36
+	LSI f8, \ptr,  40
+	LSI f9, \ptr,  44
+	LSI f10, \ptr,  48
+	LSI f11, \ptr,  52
+	LSI f12, \ptr,  56
+	LSI f13, \ptr,  60
+	LSI f14, \ptr,  64
+	LSI f15, \ptr,  68
+	.set	.Lxchal_ofs_, .Lxchal_ofs_ + 72
+	.endif
+	.endm	// xchal_cp0_load
+
+#define XCHAL_CP0_NUM_ATMPS	1
+
+/* Macro to save the state of TIE coprocessor XAD.
+ * Save area ptr (clobbered):  ptr  (16 byte aligned)
+ * Scratch regs  (clobbered):  at1..at4  (only first XCHAL_CP6_NUM_ATMPS needed)
+ */
+#define xchal_cp_XAD_store	xchal_cp6_store
+/* #define xchal_cp_XAD_store_a2	xchal_cp6_store a2 a3 a4 a5 a6 */
+	.macro	xchal_cp6_store  ptr at1 at2 at3 at4  continue=0 ofs=-1 select=XTHAL_SAS_ALL
+	xchal_sa_start \continue, \ofs
+	.ifeq (XTHAL_SAS_TIE | XTHAL_SAS_NOCC | XTHAL_SAS_CALR) & ~\select
+	xchal_sa_align	\ptr, 0, 0, 1, 16
+	rur0	\at1		// LDCBHI
+	s32i	\at1, \ptr, 0
+	rur1	\at1		// LDCBLO
+	s32i	\at1, \ptr, 4
+	rur2	\at1		// STCBHI
+	s32i	\at1, \ptr, 8
+	rur3	\at1		// STCBLO
+	s32i	\at1, \ptr, 12
+	rur8	\at1		// LDBRBASE
+	s32i	\at1, \ptr, 16
+	rur9	\at1		// LDBROFF
+	s32i	\at1, \ptr, 20
+	rur10	\at1		// LDBRINC
+	s32i	\at1, \ptr, 24
+	rur11	\at1		// STBRBASE
+	s32i	\at1, \ptr, 28
+	rur12	\at1		// STBROFF
+	s32i	\at1, \ptr, 32
+	rur13	\at1		// STBRINC
+	s32i	\at1, \ptr, 36
+	rur24	\at1		// SCRATCH0
+	s32i	\at1, \ptr, 40
+	rur25	\at1		// SCRATCH1
+	s32i	\at1, \ptr, 44
+	rur26	\at1		// SCRATCH2
+	s32i	\at1, \ptr, 48
+	rur27	\at1		// SCRATCH3
+	s32i	\at1, \ptr, 52
+	WRAS128I wra0, \ptr,  64
+	WRAS128I wra1, \ptr,  80
+	WRAS128I wra2, \ptr,  96
+	WRAS128I wra3, \ptr,  112
+	WRAS128I wra4, \ptr,  128
+	WRAS128I wra5, \ptr,  144
+	WRAS128I wra6, \ptr,  160
+	WRAS128I wra7, \ptr,  176
+	WRAS128I wra8, \ptr,  192
+	WRAS128I wra9, \ptr,  208
+	WRAS128I wra10, \ptr,  224
+	WRAS128I wra11, \ptr,  240
+	WRAS128I wra12, \ptr,  256
+	WRAS128I wra13, \ptr,  272
+	WRAS128I wra14, \ptr,  288
+	WRAS128I wra15, \ptr,  304
+	WRBS128I wrb0, \ptr,  320
+	WRBS128I wrb1, \ptr,  336
+	WRBS128I wrb2, \ptr,  352
+	WRBS128I wrb3, \ptr,  368
+	WRBS128I wrb4, \ptr,  384
+	WRBS128I wrb5, \ptr,  400
+	WRBS128I wrb6, \ptr,  416
+	WRBS128I wrb7, \ptr,  432
+	WRBS128I wrb8, \ptr,  448
+	WRBS128I wrb9, \ptr,  464
+	WRBS128I wrb10, \ptr,  480
+	WRBS128I wrb11, \ptr,  496
+	WRBS128I wrb12, \ptr,  512
+	WRBS128I wrb13, \ptr,  528
+	WRBS128I wrb14, \ptr,  544
+	WRBS128I wrb15, \ptr,  560
+	.set	.Lxchal_ofs_, .Lxchal_ofs_ + 576
+	.endif
+	.endm	// xchal_cp6_store
+
+/* Macro to restore the state of TIE coprocessor XAD.
+ * Save area ptr (clobbered):  ptr  (16 byte aligned)
+ * Scratch regs  (clobbered):  at1..at4  (only first XCHAL_CP6_NUM_ATMPS needed)
+ */
+#define xchal_cp_XAD_load	xchal_cp6_load
+/* #define xchal_cp_XAD_load_a2	xchal_cp6_load a2 a3 a4 a5 a6 */
+	.macro	xchal_cp6_load  ptr at1 at2 at3 at4  continue=0 ofs=-1 select=XTHAL_SAS_ALL
+	xchal_sa_start \continue, \ofs
+	.ifeq (XTHAL_SAS_TIE | XTHAL_SAS_NOCC | XTHAL_SAS_CALR) & ~\select
+	xchal_sa_align	\ptr, 0, 0, 1, 16
+	l32i	\at1, \ptr, 0
+	wur0	\at1		// LDCBHI
+	l32i	\at1, \ptr, 4
+	wur1	\at1		// LDCBLO
+	l32i	\at1, \ptr, 8
+	wur2	\at1		// STCBHI
+	l32i	\at1, \ptr, 12
+	wur3	\at1		// STCBLO
+	l32i	\at1, \ptr, 16
+	wur8	\at1		// LDBRBASE
+	l32i	\at1, \ptr, 20
+	wur9	\at1		// LDBROFF
+	l32i	\at1, \ptr, 24
+	wur10	\at1		// LDBRINC
+	l32i	\at1, \ptr, 28
+	wur11	\at1		// STBRBASE
+	l32i	\at1, \ptr, 32
+	wur12	\at1		// STBROFF
+	l32i	\at1, \ptr, 36
+	wur13	\at1		// STBRINC
+	l32i	\at1, \ptr, 40
+	wur24	\at1		// SCRATCH0
+	l32i	\at1, \ptr, 44
+	wur25	\at1		// SCRATCH1
+	l32i	\at1, \ptr, 48
+	wur26	\at1		// SCRATCH2
+	l32i	\at1, \ptr, 52
+	wur27	\at1		// SCRATCH3
+	WRBL128I wrb0, \ptr,  320
+	WRBL128I wrb1, \ptr,  336
+	WRBL128I wrb2, \ptr,  352
+	WRBL128I wrb3, \ptr,  368
+	WRBL128I wrb4, \ptr,  384
+	WRBL128I wrb5, \ptr,  400
+	WRBL128I wrb6, \ptr,  416
+	WRBL128I wrb7, \ptr,  432
+	WRBL128I wrb8, \ptr,  448
+	WRBL128I wrb9, \ptr,  464
+	WRBL128I wrb10, \ptr,  480
+	WRBL128I wrb11, \ptr,  496
+	WRBL128I wrb12, \ptr,  512
+	WRBL128I wrb13, \ptr,  528
+	WRBL128I wrb14, \ptr,  544
+	WRBL128I wrb15, \ptr,  560
+	WRAL128I wra0, \ptr,  64
+	WRAL128I wra1, \ptr,  80
+	WRAL128I wra2, \ptr,  96
+	WRAL128I wra3, \ptr,  112
+	WRAL128I wra4, \ptr,  128
+	WRAL128I wra5, \ptr,  144
+	WRAL128I wra6, \ptr,  160
+	WRAL128I wra7, \ptr,  176
+	WRAL128I wra8, \ptr,  192
+	WRAL128I wra9, \ptr,  208
+	WRAL128I wra10, \ptr,  224
+	WRAL128I wra11, \ptr,  240
+	WRAL128I wra12, \ptr,  256
+	WRAL128I wra13, \ptr,  272
+	WRAL128I wra14, \ptr,  288
+	WRAL128I wra15, \ptr,  304
+	.set	.Lxchal_ofs_, .Lxchal_ofs_ + 576
+	.endif
+	.endm	// xchal_cp6_load
+
+#define XCHAL_CP6_NUM_ATMPS	1
+#define XCHAL_SA_NUM_ATMPS	1
+
+	/*  Empty macros for unconfigured coprocessors:  */
+	.macro xchal_cp1_store	p a b c d continue=0 ofs=-1 select=-1 ; .endm
+	.macro xchal_cp1_load	p a b c d continue=0 ofs=-1 select=-1 ; .endm
+	.macro xchal_cp2_store	p a b c d continue=0 ofs=-1 select=-1 ; .endm
+	.macro xchal_cp2_load	p a b c d continue=0 ofs=-1 select=-1 ; .endm
+	.macro xchal_cp3_store	p a b c d continue=0 ofs=-1 select=-1 ; .endm
+	.macro xchal_cp3_load	p a b c d continue=0 ofs=-1 select=-1 ; .endm
+	.macro xchal_cp4_store	p a b c d continue=0 ofs=-1 select=-1 ; .endm
+	.macro xchal_cp4_load	p a b c d continue=0 ofs=-1 select=-1 ; .endm
+	.macro xchal_cp5_store	p a b c d continue=0 ofs=-1 select=-1 ; .endm
+	.macro xchal_cp5_load	p a b c d continue=0 ofs=-1 select=-1 ; .endm
+	.macro xchal_cp7_store	p a b c d continue=0 ofs=-1 select=-1 ; .endm
+	.macro xchal_cp7_load	p a b c d continue=0 ofs=-1 select=-1 ; .endm
+
+#endif /*_XTENSA_CORE_TIE_ASM_H*/
+

arch/xtensa/variants/s6000/include/variant/tie.h

+/*
+ * This header file describes this specific Xtensa processor's TIE extensions
+ * that extend basic Xtensa core functionality.  It is customized to this
+ * Xtensa processor configuration.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1999-2008 Tensilica Inc.
+ */
+
+#ifndef _XTENSA_CORE_TIE_H
+#define _XTENSA_CORE_TIE_H
+
+#define XCHAL_CP_NUM			2	/* number of coprocessors */
+#define XCHAL_CP_MAX			7	/* max CP ID + 1 (0 if none) */
+#define XCHAL_CP_MASK			0x41	/* bitmask of all CPs by ID */
+#define XCHAL_CP_PORT_MASK		0x00	/* bitmask of only port CPs */
+
+/*  Basic parameters of each coprocessor:  */
+#define XCHAL_CP0_NAME			"FPU"
+#define XCHAL_CP0_IDENT			FPU
+#define XCHAL_CP0_SA_SIZE		72	/* size of state save area */
+#define XCHAL_CP0_SA_ALIGN		4	/* min alignment of save area */
+#define XCHAL_CP_ID_FPU			0	/* coprocessor ID (0..7) */
+#define XCHAL_CP6_NAME			"XAD"
+#define XCHAL_CP6_IDENT			XAD
+#define XCHAL_CP6_SA_SIZE		576	/* size of state save area */
+#define XCHAL_CP6_SA_ALIGN		16	/* min alignment of save area */
+#define XCHAL_CP_ID_XAD			6	/* coprocessor ID (0..7) */
+
+/*  Filler info for unassigned coprocessors, to simplify arrays etc:  */
+#define XCHAL_CP1_SA_SIZE		0
+#define XCHAL_CP1_SA_ALIGN		1
+#define XCHAL_CP2_SA_SIZE		0
+#define XCHAL_CP2_SA_ALIGN		1
+#define XCHAL_CP3_SA_SIZE		0
+#define XCHAL_CP3_SA_ALIGN		1
+#define XCHAL_CP4_SA_SIZE		0
+#define XCHAL_CP4_SA_ALIGN		1
+#define XCHAL_CP5_SA_SIZE		0
+#define XCHAL_CP5_SA_ALIGN		1
+#define XCHAL_CP7_SA_SIZE		0
+#define XCHAL_CP7_SA_ALIGN		1
+
+/*  Save area for non-coprocessor optional and custom (TIE) state:  */
+#define XCHAL_NCP_SA_SIZE		4
+#define XCHAL_NCP_SA_ALIGN		4
+
+/*  Total save area for optional and custom state (NCP + CPn):  */
+#define XCHAL_TOTAL_SA_SIZE		672	/* with 16-byte align padding */
+#define XCHAL_TOTAL_SA_ALIGN		16	/* actual minimum alignment */
+
+/*
+ * Detailed contents of save areas.
+ * NOTE:  caller must define the XCHAL_SA_REG macro (not defined here)
+ * before expanding the XCHAL_xxx_SA_LIST() macros.
+ *
+ * XCHAL_SA_REG(s,ccused,abikind,kind,opt,name,galign,align,asize,
+ *		dbnum,base,regnum,bitsz,gapsz,reset,x...)
+ *
+ *	s = passed from XCHAL_*_LIST(s), eg. to select how to expand
+ *	ccused = set if used by compiler without special options or code
+ *	abikind = 0 (caller-saved), 1 (callee-saved), or 2 (thread-global)
+ *	kind = 0 (special reg), 1 (TIE user reg), or 2 (TIE regfile reg)
+ *	opt = 0 (custom TIE extension or coprocessor), or 1 (optional reg)
+ *	name = lowercase reg name (no quotes)
+ *	galign = group byte alignment (power of 2) (galign >= align)
+ *	align = register byte alignment (power of 2)
+ *	asize = allocated size in bytes (asize*8 == bitsz + gapsz + padsz)
+ *	  (not including any pad bytes required to galign this or next reg)
+ *	dbnum = unique target number f/debug (see <xtensa-libdb-macros.h>)
+ *	base = reg shortname w/o index (or sr=special, ur=TIE user reg)
+ *	regnum = reg index in regfile, or special/TIE-user reg number
+ *	bitsz = number of significant bits (regfile width, or ur/sr mask bits)
+ *	gapsz = intervening bits, if bitsz bits not stored contiguously
+ *	(padsz = pad bits at end [TIE regfile] or at msbits [ur,sr] of asize)
+ *	reset = register reset value (or 0 if undefined at reset)
+ *	x = reserved for future use (0 until then)
+ *
+ *  To filter out certain registers, e.g. to expand only the non-global
+ *  registers used by the compiler, you can do something like this:
+ *
+ *  #define XCHAL_SA_REG(s,ccused,p...)	SELCC##ccused(p)
+ *  #define SELCC0(p...)
+ *  #define SELCC1(abikind,p...)	SELAK##abikind(p)
+ *  #define SELAK0(p...)		REG(p)
+ *  #define SELAK1(p...)		REG(p)
+ *  #define SELAK2(p...)
+ *  #define REG(kind,tie,name,galn,aln,asz,csz,dbnum,base,rnum,bsz,rst,x...) \
+ *		...what you want to expand...
+ */
+
+#define XCHAL_NCP_SA_NUM	1
+#define XCHAL_NCP_SA_LIST(s)	\
+ XCHAL_SA_REG(s,0,0,0,1,             br, 4, 4, 4,0x0204,  sr,4  , 16,0,0,0)
+
+#define XCHAL_CP0_SA_NUM	18
+#define XCHAL_CP0_SA_LIST(s)	\
+ XCHAL_SA_REG(s,0,0,1,0,            fcr, 4, 4, 4,0x03E8,  ur,232, 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,1,0,            fsr, 4, 4, 4,0x03E9,  ur,233, 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,             f0, 4, 4, 4,0x0030,   f,0  , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,             f1, 4, 4, 4,0x0031,   f,1  , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,             f2, 4, 4, 4,0x0032,   f,2  , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,             f3, 4, 4, 4,0x0033,   f,3  , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,             f4, 4, 4, 4,0x0034,   f,4  , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,             f5, 4, 4, 4,0x0035,   f,5  , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,             f6, 4, 4, 4,0x0036,   f,6  , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,             f7, 4, 4, 4,0x0037,   f,7  , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,             f8, 4, 4, 4,0x0038,   f,8  , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,             f9, 4, 4, 4,0x0039,   f,9  , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,            f10, 4, 4, 4,0x003A,   f,10 , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,            f11, 4, 4, 4,0x003B,   f,11 , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,            f12, 4, 4, 4,0x003C,   f,12 , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,            f13, 4, 4, 4,0x003D,   f,13 , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,            f14, 4, 4, 4,0x003E,   f,14 , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,            f15, 4, 4, 4,0x003F,   f,15 , 32,0,0,0)
+
+#define XCHAL_CP1_SA_NUM	0
+#define XCHAL_CP1_SA_LIST(s)	/* empty */
+
+#define XCHAL_CP2_SA_NUM	0
+#define XCHAL_CP2_SA_LIST(s)	/* empty */
+
+#define XCHAL_CP3_SA_NUM	0
+#define XCHAL_CP3_SA_LIST(s)	/* empty */
+
+#define XCHAL_CP4_SA_NUM	0
+#define XCHAL_CP4_SA_LIST(s)	/* empty */
+
+#define XCHAL_CP5_SA_NUM	0
+#define XCHAL_CP5_SA_LIST(s)	/* empty */
+
+#define XCHAL_CP6_SA_NUM	46
+#define XCHAL_CP6_SA_LIST(s)	\
+ XCHAL_SA_REG(s,0,0,1,0,         ldcbhi,16, 4, 4,0x0300,  ur,0  , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,1,0,         ldcblo, 4, 4, 4,0x0301,  ur,1  , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,1,0,         stcbhi, 4, 4, 4,0x0302,  ur,2  , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,1,0,         stcblo, 4, 4, 4,0x0303,  ur,3  , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,1,0,       ldbrbase, 4, 4, 4,0x0308,  ur,8  , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,1,0,        ldbroff, 4, 4, 4,0x0309,  ur,9  , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,1,0,        ldbrinc, 4, 4, 4,0x030A,  ur,10 , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,1,0,       stbrbase, 4, 4, 4,0x030B,  ur,11 , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,1,0,        stbroff, 4, 4, 4,0x030C,  ur,12 , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,1,0,        stbrinc, 4, 4, 4,0x030D,  ur,13 , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,1,0,       scratch0, 4, 4, 4,0x0318,  ur,24 , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,1,0,       scratch1, 4, 4, 4,0x0319,  ur,25 , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,1,0,       scratch2, 4, 4, 4,0x031A,  ur,26 , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,1,0,       scratch3, 4, 4, 4,0x031B,  ur,27 , 32,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wra0,16,16,16,0x1010, wra,0  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wra1,16,16,16,0x1011, wra,1  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wra2,16,16,16,0x1012, wra,2  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wra3,16,16,16,0x1013, wra,3  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wra4,16,16,16,0x1014, wra,4  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wra5,16,16,16,0x1015, wra,5  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wra6,16,16,16,0x1016, wra,6  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wra7,16,16,16,0x1017, wra,7  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wra8,16,16,16,0x1018, wra,8  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wra9,16,16,16,0x1019, wra,9  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,          wra10,16,16,16,0x101A, wra,10 ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,          wra11,16,16,16,0x101B, wra,11 ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,          wra12,16,16,16,0x101C, wra,12 ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,          wra13,16,16,16,0x101D, wra,13 ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,          wra14,16,16,16,0x101E, wra,14 ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,          wra15,16,16,16,0x101F, wra,15 ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wrb0,16,16,16,0x1020, wrb,0  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wrb1,16,16,16,0x1021, wrb,1  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wrb2,16,16,16,0x1022, wrb,2  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wrb3,16,16,16,0x1023, wrb,3  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wrb4,16,16,16,0x1024, wrb,4  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wrb5,16,16,16,0x1025, wrb,5  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wrb6,16,16,16,0x1026, wrb,6  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wrb7,16,16,16,0x1027, wrb,7  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wrb8,16,16,16,0x1028, wrb,8  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,           wrb9,16,16,16,0x1029, wrb,9  ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,          wrb10,16,16,16,0x102A, wrb,10 ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,          wrb11,16,16,16,0x102B, wrb,11 ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,          wrb12,16,16,16,0x102C, wrb,12 ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,          wrb13,16,16,16,0x102D, wrb,13 ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,          wrb14,16,16,16,0x102E, wrb,14 ,128,0,0,0) \
+ XCHAL_SA_REG(s,0,0,2,0,          wrb15,16,16,16,0x102F, wrb,15 ,128,0,0,0)
+
+#define XCHAL_CP7_SA_NUM	0
+#define XCHAL_CP7_SA_LIST(s)	/* empty */
+
+/* Byte length of instruction from its first nibble (op0 field), per FLIX.  */
+#define XCHAL_OP0_FORMAT_LENGTHS	3,3,3,3,3,3,3,3,2,2,2,2,2,2,8,8
+
+#endif /*_XTENSA_CORE_TIE_H*/
+

arch/xtensa/variants/s6000/irq.c

+/*
+ * s6000 irq crossbar
+ *
+ * Copyright (c) 2009 emlix GmbH
+ * Authors:	Johannes Weiner <jw@emlix.com>
+ *		Oskar Schirmer <os@emlix.com>
+ */
+#include <linux/io.h>
+#include <asm/irq.h>
+#include <variant/hardware.h>
+
+/* S6_REG_INTC */
+#define INTC_STATUS	0x000
+#define INTC_RAW	0x010
+#define INTC_STATUS_AG	0x100
+#define INTC_CFG(n)	(0x200 + 4 * (n))
+
+/*
+ * The s6000 has a crossbar that multiplexes interrupt output lines
+ * from the peripherals to input lines on the xtensa core.
+ *
+ * We leave the mapping decisions to the platform as it depends on the
+ * actually connected peripherals which distribution makes sense.
+ */
+extern const signed char *platform_irq_mappings[NR_IRQS];
+
+static unsigned long scp_to_intc_enable[] = {
+#define	TO_INTC_ENABLE(n)	(((n) << 1) + 1)
+	TO_INTC_ENABLE(0),
+	TO_INTC_ENABLE(1),
+	TO_INTC_ENABLE(2),
+	TO_INTC_ENABLE(3),
+	TO_INTC_ENABLE(4),
+	TO_INTC_ENABLE(5),
+	TO_INTC_ENABLE(6),
+	TO_INTC_ENABLE(7),
+	TO_INTC_ENABLE(8),
+	TO_INTC_ENABLE(9),
+	TO_INTC_ENABLE(10),
+	TO_INTC_ENABLE(11),
+	TO_INTC_ENABLE(12),
+	-1,
+	-1,
+	TO_INTC_ENABLE(13),
+	-1,
+	TO_INTC_ENABLE(14),
+	-1,
+	TO_INTC_ENABLE(15),
+#undef	TO_INTC_ENABLE
+};
+
+static void irq_set(unsigned int irq, int enable)
+{
+	unsigned long en;
+	const signed char *m = platform_irq_mappings[irq];
+
+	if (!m)
+		return;
+	en = enable ? scp_to_intc_enable[irq] : 0;
+	while (*m >= 0) {
+		writel(en, S6_REG_INTC + INTC_CFG(*m));
+		m++;
+	}
+}
+
+void variant_irq_enable(unsigned int irq)
+{
+	irq_set(irq, 1);
+}
+
+void variant_irq_disable(unsigned int irq)
+{
+	irq_set(irq, 0);
+}