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* Merge tag 'xtensa-next-20130710' of git://github.com/czankel/xtensa-linuxLinus Torvalds2013-07-117-85/+105
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull Xtensa updates from Chris Zankel. * tag 'xtensa-next-20130710' of git://github.com/czankel/xtensa-linux: (22 commits) xtensa: remove the second argument of __bio_kmap_atomic() xtensa: add static function tracer support xtensa: Flat DeviceTree copy not future-safe xtensa: check TLB sanity on return to userspace xtensa: adjust boot parameters address when INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX is selected xtensa: bootparams: fix typo xtensa: tell git to ignore generated .dtb files xtensa: ccount based sched_clock xtensa: ccount based clockevent implementation xtensa: consolidate ccount access routines xtensa: cleanup ccount frequency tracking xtensa: timex.h: remove unused symbols xtensa: tell git to ignore copied zlib source files xtensa: fix section mismatch in pcibios_fixup_bus xtensa: ISS: fix section mismatch in iss_net_setup arch: xtensa: include: asm: compiling issue, need cmpxchg64() defined. xtensa: xtfpga: fix section mismatch xtensa: remove unused platform_init_irq() xtensa: tell git to ignore generated files xtensa: flush TLB entries for pages of non-current mm correctly ...
| * xtensa: add static function tracer supportMax Filippov2013-07-081-2/+15
| | | | | | | | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: bootparams: fix typoBaruch Siach2013-07-081-1/+1
| | | | | | | | | | | | Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: consolidate ccount access routinesBaruch Siach2013-07-081-10/+3
| | | | | | | | | | | | | | Use get_ccount everywhere; remove xtensa_get_ccount. Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: cleanup ccount frequency trackingBaruch Siach2013-07-081-3/+2
| | | | | | | | | | | | | | Remove unused nsec_per_ccount, and rename ccount_per_jiffy to ccount_preq. Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: timex.h: remove unused symbolsBaruch Siach2013-07-081-7/+0
| | | | | | | | | | Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Chris Zankel <chris@zankel.net>
| * arch: xtensa: include: asm: compiling issue, need cmpxchg64() defined.Chen Gang2013-06-051-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | When compiling with 'allmodconfig', some of drivers need cmpxchg64(), xtensa does not supply 64-bit implementation for 'xchg', so use the 'generic' implementation. e.g. (for next-20130527 tree): drivers/block/blockconsole.c:164:2: error: implicit declaration of function ‘cmpxchg64’ [-Werror=implicit-function-declaration] Signed-off-by: Chen Gang <gang.chen@asianux.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: remove unused platform_init_irq()Baruch Siach2013-06-051-5/+0
| | | | | | | | | | | | Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: fix TLB multihit exceptionsChris Zankel2013-05-201-57/+83
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - set _PAGE_USER in the pte_clear to avoid having TLB multihit exceptions (see following threads for more details); http://lists.linux-xtensa.org/pipermail/linux-xtensa/Week-of-Mon-20130401/ http://lists.linux-xtensa.org/pipermail/linux-xtensa/Week-of-Mon-20130408/ - improved documentation of the PTE layout - fix PTE mapping for present and 'prot_none' pages for T1050 hw and earlier - fix pte_file offset and size - add check for the correct number of bits for swap type CC: piet.delaney@gmail.com CC: jcmvbkbc@gmail.com Signed-off-by: Chris Zankel <chris@zankel.net>
* | consolidate io_remap_pfn_range definitionsAl Viro2013-06-291-8/+0
|/ | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Merge tag 'xtensa-next-20130508' of git://github.com/czankel/xtensa-linuxLinus Torvalds2013-05-099-24/+314
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull xtensa updates from Chris Zankel: "Support for the latest MMU architecture that allows for a larger accessible memory region, and various bug-fixes" * tag 'xtensa-next-20130508' of git://github.com/czankel/xtensa-linux: xtensa: Switch to asm-generic/linkage.h xtensa: fix redboot load address xtensa: ISS: fix timer_lock usage in rs_open xtensa: disable IRQs while IRQ handler is running xtensa: enable lockdep support xtensa: fix arch_irqs_disabled_flags implementation xtensa: add irq flags trace support xtensa: provide custom CALLER_ADDR* implementations xtensa: add stacktrace support xtensa: clean up stpill_registers xtensa: don't use a7 in simcalls xtensa: don't attempt to use unconfigured timers xtensa: provide default platform_pcibios_init implementation xtensa: remove KCORE_ELF again xtensa: document MMUv3 setup sequence xtensa: add MMU v3 support xtensa: fix ibreakenable register update xtensa: fix oprofile building as module
| * xtensa: Switch to asm-generic/linkage.hGeert Uytterhoeven2013-05-092-16/+1
| | | | | | | | Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
| * xtensa: fix arch_irqs_disabled_flags implementationMax Filippov2013-05-091-1/+4
| | | | | | | | | | | | | | | | IRQs are disabled when PS.EXCM is set or PS.INTLEVEL is equal to or higher than LOCKLEVEL. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: provide custom CALLER_ADDR* implementationsMax Filippov2013-05-091-1/+33
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Definition of CALLER_ADDR* through __builtin_return_address makes compiler insert calls to __xtensa_libgcc_window_spill, which in turn makes fast_syscall_spill_registers syscall that clobbers registers when called from the kernel mode, leading to invalid opcode exceptions on return to userspace. Provide definition for CALLER_ADDR0 as MAKE_PC_FROM_RA(a0, a1) and in case CONFIG_FRAME_POINTER is enabled extract CALLER_ADDR{1-3} from stack. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: add stacktrace supportMax Filippov2013-05-091-0/+36
| | | | | | | | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: clean up stpill_registersMax Filippov2013-05-091-3/+2
| | | | | | | | | | | | | | | | - remove unused asm parameters; - fix EXCM bit setting in the PS SR during _spill_registers call. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: don't attempt to use unconfigured timersMax Filippov2013-05-091-3/+6
| | | | | | | | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: add MMU v3 supportMax Filippov2013-05-092-0/+232
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | MMUv3 comes out of reset with identity vaddr -> paddr mapping in the TLB way 6: Way 6 (512 MB) Vaddr Paddr ASID Attr RWX Cache ---------- ---------- ---- ---- --- ------- 0x00000000 0x00000000 0x01 0x03 RWX Bypass 0x20000000 0x20000000 0x01 0x03 RWX Bypass 0x40000000 0x40000000 0x01 0x03 RWX Bypass 0x60000000 0x60000000 0x01 0x03 RWX Bypass 0x80000000 0x80000000 0x01 0x03 RWX Bypass 0xa0000000 0xa0000000 0x01 0x03 RWX Bypass 0xc0000000 0xc0000000 0x01 0x03 RWX Bypass 0xe0000000 0xe0000000 0x01 0x03 RWX Bypass This patch adds remapping code at the reset vector or at the kernel _start (depending on CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX) that reconfigures MMUv3 as MMUv2: Way 5 (128 MB) Vaddr Paddr ASID Attr RWX Cache ---------- ---------- ---- ---- --- ------- 0xd0000000 0x00000000 0x01 0x07 RWX WB 0xd8000000 0x00000000 0x01 0x03 RWX Bypass Way 6 (256 MB) Vaddr Paddr ASID Attr RWX Cache ---------- ---------- ---- ---- --- ------- 0xe0000000 0xf0000000 0x01 0x07 RWX WB 0xf0000000 0xf0000000 0x01 0x03 RWX Bypass Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
* | consolidate cond_syscall and SYSCALL_ALIAS declarationsAl Viro2013-03-031-8/+0
|/ | | | | | take them to asm/linkage.h, with default in linux/linkage.h Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Merge tag 'xtensa-next-20130225' of git://github.com/czankel/xtensa-linuxLinus Torvalds2013-02-2610-13/+45
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull xtensa update from Chris Zankel: "Added features: - add support for thread local storage (TLS) - add accept4 and finit_module syscalls - support medium-priority interrupts - add support for dc232c processor variant - support file-base simulated disk for ISS simulator Bug fixes: - fix return values returned by the str[n]cmp functions - avoid mmap cache aliasing - fix handling of 'windowed registers' in ptrace" * tag 'xtensa-next-20130225' of git://github.com/czankel/xtensa-linux: xtensa: add accept4 syscall xtensa: add support for TLS xtensa: add missing include asm/uaccess.h to checksum.h xtensa: do not enable GENERIC_GPIO by default xtensa: complete ptrace handling of register windows xtensa: add support for oprofile xtensa: move spill_registers to traps.h xtensa: ISS: add host file-based simulated disk xtensa: fix str[n]cmp return value xtensa: avoid mmap cache aliasing xtensa: add finit_module syscall xtensa: pull signal definitions from signal-defs.h xtensa: fix ipc_parse_version selection xtensa: dispatch medium-priority interrupts xtensa: Add config files for Diamond 233L - Rev C processor variant xtensa: use new common dtc rule xtensa: rename prom_update_property to of_update_property
| * xtensa: add support for TLSChris Zankel2013-02-232-2/+4
| | | | | | | | | | | | | | | | | | | | The Xtensa architecture provides a global register called THREADPTR for the purpose of Thread Local Storage (TLS) support. This allows us to use a fairly simple implementation, keeping the thread pointer in the regset and simply saving and restoring it upon entering/exiting the from user space. Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: add missing include asm/uaccess.h to checksum.hMax Filippov2013-02-231-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | This fixes the following build errors seen in the linux-next: arch/xtensa/include/asm/checksum.h:247:2: error: implicit declaration of function 'access_ok' [-Werror=implicit-function-declaration] arch/xtensa/include/asm/checksum.h:247:16: error: 'VERIFY_WRITE' undeclared (first use in this function) Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: move spill_registers to traps.hMax Filippov2013-02-231-0/+24
| | | | | | | | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: fix str[n]cmp return valueMax Filippov2013-02-231-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | str[n]cmp functions return negative value if the first string is less than the second, positive value if the first string is greater than the second and zero if they are equal. This is important when these functions are used for sorting/binary search. With incorrect strcmp return value bsearch was always failing in the find_symbol_in_section making it impossible to load any module. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: avoid mmap cache aliasingMax Filippov2013-02-231-0/+4
| | | | | | | | | | | | | | | | | | | | Provide arch_get_unmapped_area function aligning shared memory mapping addresses to the biggest of the page size or the cache way size. That guarantees that corresponding virtual addresses of shared mappings are cached by the same cache sets. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: dispatch medium-priority interruptsMarc Gauthier2013-02-234-9/+10
| | | | | | | | | | | | | | | | | | | | Add support for dispatching medium-priority interrupts, that is, interrupts of priority levels 2 to EXCM_LEVEL. IRQ handling may be preempted by higher priority IRQ. Signed-off-by: Marc Gauthier <marc@tensilica.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
* | Merge branch 'for-linus' of ↵Linus Torvalds2013-02-233-19/+1
|\ \ | |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal Pull signal handling cleanups from Al Viro: "This is the first pile; another one will come a bit later and will contain SYSCALL_DEFINE-related patches. - a bunch of signal-related syscalls (both native and compat) unified. - a bunch of compat syscalls switched to COMPAT_SYSCALL_DEFINE (fixing several potential problems with missing argument validation, while we are at it) - a lot of now-pointless wrappers killed - a couple of architectures (cris and hexagon) forgot to save altstack settings into sigframe, even though they used the (uninitialized) values in sigreturn; fixed. - microblaze fixes for delivery of multiple signals arriving at once - saner set of helpers for signal delivery introduced, several architectures switched to using those." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: (143 commits) x86: convert to ksignal sparc: convert to ksignal arm: switch to struct ksignal * passing alpha: pass k_sigaction and siginfo_t using ksignal pointer burying unused conditionals make do_sigaltstack() static arm64: switch to generic old sigaction() (compat-only) arm64: switch to generic compat rt_sigaction() arm64: switch compat to generic old sigsuspend arm64: switch to generic compat rt_sigqueueinfo() arm64: switch to generic compat rt_sigpending() arm64: switch to generic compat rt_sigprocmask() arm64: switch to generic sigaltstack sparc: switch to generic old sigsuspend sparc: COMPAT_SYSCALL_DEFINE does all sign-extension as well as SYSCALL_DEFINE sparc: kill sign-extending wrappers for native syscalls kill sparc32_open() sparc: switch to use of generic old sigaction sparc: switch sys_compat_rt_sigaction() to COMPAT_SYSCALL_DEFINE mips: switch to generic sys_fork() and sys_clone() ...
| * burying unused conditionalsAl Viro2013-02-141-2/+0
| | | | | | | | | | | | | | | | | | __ARCH_WANT_SYS_RT_SIGACTION, __ARCH_WANT_SYS_RT_SIGSUSPEND, __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND, __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL - not used anymore CONFIG_GENERIC_{SIGALTSTACK,COMPAT_RT_SIG{ACTION,QUEUEINFO,PENDING,PROCMASK}} - can be assumed always set.
| * xtensa: switch to generic sigaltstackAl Viro2013-02-031-1/+0
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * take sys_rt_sigsuspend() prototype to linux/syscalls.hAl Viro2013-02-031-1/+0
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * consolidate kernel-side struct sigaction declarationsAl Viro2013-02-031-6/+1
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * consolidate declarations of k_sigactionAl Viro2013-02-031-4/+0
| | | | | | | | | | | | | | Only alpha and sparc are unusual - they have ka_restorer in it. And nobody needs that exposed to userland. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * sanitize rt_sigaction() situation a bitAl Viro2013-02-031-5/+0
| | | | | | | | | | | | | | | | | | | | | | Switch from __ARCH_WANT_SYS_RT_SIGACTION to opposite (!CONFIG_ODD_RT_SIGACTION); the only two architectures that need it are alpha and sparc. The reason for use of CONFIG_... instead of __ARCH_... is that it's needed only kernel-side and doing it that way avoids a mess with include order on many architectures. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | xtensa: Provide dummy dma_mmap_coherent() and dma_get_sgtable()Geert Uytterhoeven2013-01-291-0/+15
|/ | | | | | | | | | | | | | | | | | | | | xtensa/allmodconfig: drivers/media/v4l2-core/videobuf2-dma-contig.c: In function ‘vb2_dc_mmap’: drivers/media/v4l2-core/videobuf2-dma-contig.c:204: error: implicit declaration of function ‘dma_mmap_coherent’ drivers/media/v4l2-core/videobuf2-dma-contig.c: In function ‘vb2_dc_get_base_sgt’: drivers/media/v4l2-core/videobuf2-dma-contig.c:387: error: implicit declaration of function ‘dma_get_sgtable’ For architectures using dma_map_ops, dma_mmap_coherent() and dma_get_sgtable() are provided in <asm-generic/dma-mapping-common.h>. Xtensa does not use dma_map_ops, hence it should implement them itself. For now, use dummy implementations that just return -EINVAL, until the API has been finalized. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: linux-xtensa@linux-xtensa.org Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
* Merge tag 'asm-generic' of ↵Linus Torvalds2012-12-212-4/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic Pull asm-generic cleanup from Arnd Bergmann: "These are a few cleanups for asm-generic: - a set of patches from Lars-Peter Clausen to generalize asm/mmu.h and use it in the architectures that don't need any special handling. - A patch from Will Deacon to remove the {read,write}s{b,w,l} as discussed during the arm64 review - A patch from James Hogan that helps with the meta architecture series." * tag 'asm-generic' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic: xtensa: Use generic asm/mmu.h for nommu h8300: Use generic asm/mmu.h c6x: Use generic asm/mmu.h asm-generic/mmu.h: Add support for FDPIC asm-generic/mmu.h: Remove unused vmlist field from mm_context_t asm-generic: io: remove {read,write} string functions asm-generic/io.h: remove asm/cacheflush.h include
| * xtensa: Use generic asm/mmu.h for nommuLars-Peter Clausen2012-12-092-4/+1
| | | | | | | | | | | | | | | | | | The nommu portion of mmu.h of the extensa platform is basically the same as the asm-generic mmu.h. So use it instead. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Acked-by: Chris Zankel <chris@zankel.net> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
* | Merge branch 'for-linus' of ↵Linus Torvalds2012-12-202-1/+2
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal Pull signal handling cleanups from Al Viro: "sigaltstack infrastructure + conversion for x86, alpha and um, COMPAT_SYSCALL_DEFINE infrastructure. Note that there are several conflicts between "unify SS_ONSTACK/SS_DISABLE definitions" and UAPI patches in mainline; resolution is trivial - just remove definitions of SS_ONSTACK and SS_DISABLED from arch/*/uapi/asm/signal.h; they are all identical and include/uapi/linux/signal.h contains the unified variant." Fixed up conflicts as per Al. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: alpha: switch to generic sigaltstack new helpers: __save_altstack/__compat_save_altstack, switch x86 and um to those generic compat_sys_sigaltstack() introduce generic sys_sigaltstack(), switch x86 and um to it new helper: compat_user_stack_pointer() new helper: restore_altstack() unify SS_ONSTACK/SS_DISABLE definitions new helper: current_user_stack_pointer() missing user_stack_pointer() instances Bury the conditionals from kernel_thread/kernel_execve series COMPAT_SYSCALL_DEFINE: infrastructure
| * | missing user_stack_pointer() instancesAl Viro2012-12-191-0/+2
| | | | | | | | | | | | | | | | | | | | | for the architectures that have usp in pt_regs and do not have user_stack_pointer() already defined. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | Bury the conditionals from kernel_thread/kernel_execve seriesAl Viro2012-12-191-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | All architectures have CONFIG_GENERIC_KERNEL_THREAD CONFIG_GENERIC_KERNEL_EXECVE __ARCH_WANT_SYS_EXECVE None of them have __ARCH_WANT_KERNEL_EXECVE and there are only two callers of kernel_execve() (which is a trivial wrapper for do_execve() now) left. Kill the conditionals and make both callers use do_execve(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | | xtensa: clean up files to make them code-style compliantChris Zankel2012-12-1823-86/+89
| | | | | | | | | | | | | | | | | | | | | Remove heading and trailing spaces, trim trailing lines, and wrap lines that are longer than 80 characters. Signed-off-by: Chris Zankel <chris@zankel.net>
* | | xtensa: add device trees supportMax Filippov2012-12-182-0/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Device trees allow specification of hardware topology and device parameters at runtime instead of hard-coding them in platform setup code. This allows running single binary kernel on a range of compatible boards. New boot parameters tag BP_TAG_FDT is allocated and a pointer to flat device tree is passed in it. Note that current interrupt mapping scheme uses single cell for interrupt identification. That means that IRQ numbers used in DTS must be CPU internal IRQ numbers, not external. It is possible to extend interrupt identification to two cells, and use second cell to tell external IRQ numbers form internal. That would allow to use single DTS on multiple boards with different mapping of external IRQ numbers. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
* | | xtensa: fix mb and wmb definitionsMax Filippov2012-12-181-3/+3
| | | | | | | | | | | | | | | | | | | | | Define mb and wmb as memw to force memory barrier. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
* | | xtensa: add s32c1i-based spinlock implementationsMax Filippov2012-12-181-1/+187
| | | | | | | | | | | | | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
* | | xtensa: add s32c1i-based bitops implementationsMax Filippov2012-12-181-1/+126
| | | | | | | | | | | | | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
* | | xtensa: add s32c1i-based atomic ops implementationsMax Filippov2012-12-182-106/+236
| | | | | | | | | | | | | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
* | | xtensa: add s32c1i sanity checkMax Filippov2012-12-181-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a brief sanity test of S32C1I functionality. This instruction is needed by the kernel and userland as part of the base ABI (including GCC atomic builtins, certain threading packages, future atomic support in the C++ standard, etc). However, correct operation of this instruction requires some cooperation by hardware external to the processor (such as bus bridge, bus fabric, or memory controller). Minimally exercising this mechanism and reporting explicit status early in the boot process is helpful to chip vendors using the Linux kernel as a benchmark of correctness of hardware. As it turns out, S32C1I is not exercised by the kernel and by uClibc based userland as of early June 2008. This is expected to change soon as both incorporate more recent open source developments. Signed-off-by: Marc Gauthier <marc@tensilica.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
* | | xtensa: add trap_set_handler functionMax Filippov2012-12-181-0/+23
| | | | | | | | | | | | | | | | | | | | | | | | trap_set_handler sets new C-handler in the exception table and returns previous handler. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
* | | xtensa: initialize atomctl SRMax Filippov2012-12-181-0/+55
| | | | | | | | | | | | | | | | | | | | | | | | In order to use S32C1I instruction on cores with ATOMCTL SR the register must be properly initialized. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
* | | xtensa: save and restore scompare1 SR on kernel entryMax Filippov2012-12-181-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | Although scompare1 may be saved/restored by xchal_ncp_{load,store} macros, explicit save/restore of registers manipulated by the kernel itself is considered more correct. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
* | | xtensa: provide DMA_ERROR_CODE definitionMax Filippov2012-12-181-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This fixes the following allmodconfig build error: drivers/uio/uio_dmem_genirq.c:95:18: error: 'DMA_ERROR_CODE' undeclared (first use in this function) drivers/uio/uio_dmem_genirq.c:238:18: error: 'DMA_ERROR_CODE' undeclared (first use in this function) make[3]: *** [drivers/uio/uio_dmem_genirq.o] Error 1 Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
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