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* Blackfin: fix SMP build error in start_thread()Graf Yang2009-11-25
| | | | | | | | | Commit d5ce528c8e46fa5afb9 (Blackfin: convert irq/process to asm-generic) incorrectly merged the smp and non-smp cases of start_thread() causing the L1 stack to be setup on the SMP port instead of the UP port. Signed-off-by: Graf Yang <graf.yang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: fix typo in ptrace pokingJie Zhang2009-11-25
| | | | | | | | | Commit c014e15a2f667f9 (Blackfin: convert ptrace to new memory functions) introduced a copy & paste typo in the ptrace poke data/text handling. The access_process_vm() function call was telling it to read instead of write. Signed-off-by: Jie Zhang <jie.zhang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: fix cache Kconfig typoAndré Goddard Rosa2009-11-25
| | | | | | | The Kconfig option is "BFIN_EXTMEM_WRITETHROUGH", not "..._WRITETROUGH". Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: fix suspend/resume failure with some on-chip ROMsMichael Hennerich2009-11-25
| | | | | | | | | | | Some Blackfin on-chip ROMs utilize some MDMA channels during the suspend and resume process, but don't clean up after themselves. So manually clear all DMA channels when resuming since no DMA could have been running at this point in time. Now Linux should be able to work regardless of any laziness on the part of the on-chip ROM or boot loader. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* headers: remove sched.h from interrupt.hAlexey Dobriyan2009-10-11
| | | | | | | | After m68k's task_thread_info() doesn't refer to current, it's possible to remove sched.h from interrupt.h and not break m68k! Many thanks to Heiko Carstens for allowing this. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
* Blackfin: fix framebuffer mmap bug for nommuThomas Chou2009-10-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The patch added a special get_unmapped_area for framebuffer which was hooked to the file ops in drivers/video/fbmem.c. This is needed since v2.6.29-rc1 where nommu vma management was updated, and mmap of framebuffer caused kernel BUG panic. You may turn on "Debug the global anon/private NOMMU mapping region tree" config to such message. As Documentation/nommu-mmap.txt said, "To provide shareable character device support, a driver must provide a file->f_op->get_unmapped_area() operation. The mmap() routines will call this to get a proposed address for the mapping." With this change, user space should call mmap for framebuffer using shared map. Or it can try shared map first, then private map if failed. This shared map usage is now consistent between mmu and nommu. The sys_ file may not be a good place for this patch. But there is a similar one for sparc. I tested a similar patch on nios2nommu, though I don't have a blackfin board to test. Signed-off-by: Thomas Chou <thomas@wytron.com.tw> Signed-off-by: Graf Yang <graf.yang@analog.com> Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: cplbinfo: drop d_path() hacksMike Frysinger2009-10-07
| | | | | | | | | | | The cplbinfo was using d_path() to figure out which cpu/cplb was being parsed. As Al pointed out, this isn't exactly reliable as it assumes the static VFS path to be unchanged, and it's just poor form. So use the proc_create_data() to properly (and internally) pass the exact cpu/cplb requested to the parser function. Reported-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: mass clean up of copyright/licensing infoRobin Getz2009-10-07
| | | | | | | | | | | | | | | | | | Bill Gatliff & David Brownell pointed out we were missing some copyrights, and licensing terms in some of the files in ./arch/blackfin, so this fixes things, and cleans them up. It also removes: - verbose GPL text(refer to the top level ./COPYING file) - file names (you are looking at the file) - bug url (it's in the ./MAINTAINERS file) - "or later" on GPL-2, when we did not have that right It also allows some Blackfin-specific assembly files to be under a BSD like license (for people to use them outside of Linux). Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: convert to use arch_gettimeoffset()john stultz2009-10-07
| | | | | | | | | | | | | | | Convert Blackfin to use GENERIC_TIME via the arch_getoffset() infrastructure, reducing the amount of arch specific code we need to maintain. I've taken my best swing at converting this, but I'm not 100% confident I got it right. My cross-compiler is now out of date (gcc4.2) so I wasn't able to check if it compiled. Any assistance from arch maintainers or testers to get this merged would be great. Signed-off-by: John Stultz <johnstul@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* blackfin: Cleanup linker script using new linker script macros.Tim Abbott2009-09-24
| | | | | | | | | Signed-off-by: Tim Abbott <tabbott@ksplice.com> Cc: Bryan Wu <cooloney@kernel.org> Cc: uclinux-dist-devel@blackfin.uclinux.org Acked-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Blackfin: update ftrace for latest toolchainYi Li2009-09-16
| | | | | | | | | | | | The mcount support that was finally added to the Blackfin gcc port isn't exactly the same as what ftrace was developed against. Now that the final gcc version is in place, update the ftrace code to match. While updating this, fix the swapped arguments to the tracer (signature is (ip, parent_ip) while we were passing (parent_ip, ip)). Signed-off-by: Yi Li <yi.li@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: unify cache init functionsMike Frysinger2009-09-16
| | | | | | | | The CPLB implementations (mpu/nompu) had exact copies of the cacheinit code. Even the i/d cache functions are largely the same. So unify them both in the common kernel cache code. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: swap clocksource ratings for gptimer/cyclesGraf Yang2009-09-16
| | | | | | | | The cycles clocksource is a higher resolution than the gptimer one, so make sure the ratings field reflects this. Signed-off-by: Graf Yang <graf.yang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: update ftrace_push_return_trace() breakageMike Frysinger2009-09-16
| | | | | | | | Commit 71e308a239c updated ftrace_push_return_trace() prototype but didn't update the Blackfin ftrace code, so things broke. Since we don't support the new stuff yet, call it with stub values. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: add ICPLB coverage for async banksBernd Schmidt2009-09-16
| | | | | | | | When doing XIP, we need to execute out of the async banks, so we need ICPLBs to allow this. Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: use KERN_ALERT in all kgdb_test outputMingquan Pan2009-09-16
| | | | | | | | Most messages are already using KERN_ALERT, so be consistent to make things easier to check with test scripts. Signed-off-by: Mingquan Pan <grace.pan@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: fix spelling in a few commentsMichael Hennerich2009-09-16
| | | | | Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: use raw_smp_processor_id() in exception codeYi Li2009-09-16
| | | | | | | | | | | When preempt debugging is enabled, smp_processor_id() may utilize the "current" structure. This may not be safe to access under all exceptions due to it being in dynamically allocated memory. So in exception code, make sure we use raw_smp_processor_id() instead to get at the real value directly. Signed-off-by: Yi Li <yi.li@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: remove useless duplicated assignment in gpio codeMichael Hennerich2009-09-16
| | | | | Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: Fix link errors with binutils 2.19 and GCC 4.3Ingo Molnar2009-09-16
| | | | | | | | | | | | | | | | | | | | | Not sure whether this has been reported/fixed before. Today I built a Blackfin tool-chain from scratch for -tip testing, and it triggers: arch/blackfin/kernel/vmlinux.lds:1238: undefined section `.data_a_l1' referenced in expression and: arch/blackfin/kernel/vmlinux.lds:1238: undefined section `.text_data_l1' referenced in expression Now i dont have any way to test this linker script, but it now at least builds fine after fixing what appears to be typos in those assert statements. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: optimize fixed code handling for the most common caseMike Frysinger2009-09-16
| | | | | | | | | | | The majority of the time we are returning to user space, it is not in the fixed atomic code region. So rather than branch to a function where we check the PC and return, do the check inline and branch only when needed. Also, tweak some of the fixed code handling based on assumptions we are aware of but cannot be expressed in C. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: punt dead cache locking codeMike Frysinger2009-09-16
| | | | | | | No one uses these functions, and some are duplicate of existing C code. So just punt the whole thing. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: do not trace the exception handlerYi Li2009-09-16
| | | | | | | | Since the exception handler cannot cause exceptions, we cannot trace it without easily causing double faults and crashing the system. Signed-off-by: Yi Li <yi.li@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: cleanup sync handling when enabling/disabling cplbsYi Li2009-09-16
| | | | | | | | | | | | | | The handling of updating the [DI]MEM_CONTROL MMRs does not follow proper sync procedures as laid out in the Blackfin programming manual. So rather than audit/fix every call location, create helper functions that do the right things in order to safely update these MMRs. Then convert all call sites to use these new helper functions. While we're fixing the code, drop the workaround for anomaly 05000125 as that anomaly applies to old versions of silicon that we do not support. Signed-off-by: Yi Li <yi.li@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: fix read buffer overflowRoel Kluin2009-09-16
| | | | | | | Check whether index is within bounds before testing the element. Signed-off-by: Roel Kluin <roel.kluin@gmail.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: improve double fault debug handlingGraf Yang2009-09-16
| | | | | | | | | | | | | | Since the hardware only provides reporting for the last exception handled, and the values are valid only when executing the exception handler, we need to save the context for reporting at a later point. While we do this for one exception, it doesn't work properly when handling a second one as the original exception is clobbered by the double fault. So when double fault debugging is enabled, create a dedicated shadow of these values and save/restore out of there. Now the crash report properly displays the first exception as well as the second one. Signed-off-by: Graf Yang <graf.yang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: fix MPU handling of invalid memory accessesGraf Yang2009-09-16
| | | | | | | | | | | | The protect_page() function was incorrectly setting up the hardware tables based on possible access capabilities rather than the actual requested values. This means we would grant more access to mmap-ed pages than we should have. Once we fix this, we need to tweak the signal generated by such accesses to aline ourselves with other ports. This allows the LTP mmap0{5,6,7} cases to run properly. Signed-off-by: Graf Yang <graf.yang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: do not try displaying the end of the stackSonic Zhang2009-09-16
| | | | | | | | | The end of the stack may not be valid (and that could be OK), so do not attempt to parse it. If we do, we might use a bad pointer in kernel space which makes things panic(). Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: catch hardware errors earlier during bootingRobin Getz2009-09-16
| | | | | | | | | | | | | | | | | | Allow hardware errors to be caught during early portions of booting, and leave something in the shadow console that people can use to debug their system with (to be printed out by the bootloader on next reset). This enables the hardare error interrupts in head.S, allowing us to find hardware errors when they happen (well, as much as you can with a hardware error) and prints out the trace if it is enabled. This will catch errors (like booting the wrong image on a 533) which previously resulted in a infinite loop/hang, as well as random hardware errors before before setup_arch(). To disable this debug only feature - turn off EARLY_PRINTK. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: add an early shadow consoleRobin Getz2009-09-16
| | | | | | | | | Add a memory based shadow console to keep a copy of the printk buffer in a location which can be found externally. This allows bootloaders to locate and utilize the log buffer in case of silent (early/resume/etc...) crashes. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: add support for common FDPIC ptrace requestsMike Frysinger2009-09-16
| | | | | | | | The FDPIC arches support a standard set of ptrace requests so rather than define our own custom API, hook up those requests for common code to leverage. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: clean up early memory setup codeRobin Getz2009-09-16
| | | | | | | | Remove code duplication, and only print out memory warnings when they are an actual problem. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: fix module reloc handling for all memory regionsMike Frysinger2009-09-16
| | | | | | | | | The current module relocation code has spotty handling wrt different memory regions (like L1 instruction). Rather than try to fix each little spot, use the new common memory functions to greatly simplify everything and make sure it is always correct. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: cleanup module section checkingMike Frysinger2009-09-16
| | | | | | | | | The current module section handling code has a lot of verbose statements copied and pasted throughout which makes it pretty hard to digest at a glance. By unifying all of these up front, it is a lot easier to quickly get an idea of what is actually going on. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: convert malloc()/memset() to zalloc() in module codeMike Frysinger2009-09-16
| | | | Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: cleanup printk() usage in module codeMike Frysinger2009-09-16
| | | | | | | Convert all printk() statements to use the common pr_xxx() funcs and use the new pr_fmt() function to standardize all of the output. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: reject outdated/unused/wrong relocation typesRobin Getz2009-09-16
| | | | | | | | | | | All kernel modules are required to be built with -mlong-calls and thus should not generate any of these relocations. If they do, it means the module has not been compiled properly, so rather than trying to handle them (and running into random run time errors) just error out on module load to force the module to be compiled correctly. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: convert ptrace to new memory functionsMike Frysinger2009-09-16
| | | | | | | | | Now that we have a Blackfin memory function to figure out how to properly access the different regions, drop the custom memory range checks in our ptrace code and use that. It makes the code nicer and fixes bugs where the ptrace logic wasn't handling all the different regions. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: cleanup traps decode_address() a bitMike Frysinger2009-09-16
| | | | | | | Unify the address display to shrink the code, and add missing decoding of a few special Blackfin-specific regions (L1 ROM and MMRs). Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: inline I-pipe bypass code in ret_from_exceptionPhilippe Gerum2009-09-16
| | | | | Signed-off-by: Philippe Gerum <rpm@xenomai.org> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: allow high priority domains to preempt schedule_tail()Philippe Gerum2009-09-16
| | | | | | | | | | | | | | ret_from_fork is always entered with hw interrupts off, which prevents real-time domains to preempt the Linux kernel during part of the initial context switch to the new task, which could in turn raise the worst-case latency figures. To avoid this, stall the root domain stage in the interrupt pipeline to keep the scheduling tail code free from Linux-handled IRQs, then enable hardware interrupts again. Signed-off-by: Philippe Gerum <rpm@xenomai.org> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: export show_stack() to modulesPhilippe Gerum2009-09-16
| | | | | Signed-off-by: Philippe Gerum <rpm@xenomai.org> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: fix misnomer of some I-pipe helpersPhilippe Gerum2009-09-16
| | | | | | | | | | __ipipe_{stall, unstall}_root_raw() identifiers may leave the reader under the impression that only the virtual state is affected by these operations, which is wrong. Pick names following the convention used throughout the interrupt pipeline code. Signed-off-by: Philippe Gerum <rpm@xenomai.org> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: checkpatch --file arch/blackfin/kernel/ipipe.cPhilippe Gerum2009-09-16
| | | | | Signed-off-by: Philippe Gerum <rpm@xenomai.org> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: make EVT3->EVT5 lowering more robust wrt IPEND[4]Robin Getz2009-09-16
| | | | | | | | | | | | | | | | | We handle many exceptions at EVT5 (hardware error level) so that we can catch exceptions in our exception handling code. Today - if the global interrupt enable bit (IPEND[4]) is set (interrupts disabled) our trap handling code goes into a infinite loop, since we need interrupts to be on to defer things to EVT5. Normal kernel code should not trigger this for any reason as IPEND[4] gets cleared early (when doing an interrupt context save) and the kernel stack there should be sane (or something much worse is happening in the system). But there have been a few times where this has happened, so this change makes sure we dump a proper crash message even when things have gone south. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Merge branch 'percpu-for-linus' into percpu-for-nextTejun Heo2009-08-14
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: arch/sparc/kernel/smp_64.c arch/x86/kernel/cpu/perf_counter.c arch/x86/kernel/setup_percpu.c drivers/cpufreq/cpufreq_ondemand.c mm/percpu.c Conflicts in core and arch percpu codes are mostly from commit ed78e1e078dd44249f88b1dd8c76dafb39567161 which substituted many num_possible_cpus() with nr_cpu_ids. As for-next branch has moved all the first chunk allocators into mm/percpu.c, the changes are moved from arch code to mm/percpu.c. Signed-off-by: Tejun Heo <tj@kernel.org>
| * Blackfin: add CPLB entries for Core B on-chip L1 SRAM regionsGraf Yang2009-07-16
| | | | | | | | | | | | | | | | | | The Blackfin SMP port was missing CPLB entries for Core B on-chip L1 SRAM regions. Any code that attempted to use these would wrongly crash due to a CPLB miss. Signed-off-by: Graf Yang <graf.yang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
| * Blackfin: work around anomaly 05000189Robin Getz2009-07-16
| | | | | | | | | | | | | | | | | | Similar to anomaly 05000281 but not as bad, we cannot return to the instruction causing a fault otherwise we'll trigger a second false exception. The system can still recover, but it isn't correct. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
| * Blackfin: drop per-cpu loops_per_jiffy trackingMichael Hennerich2009-07-16
| | | | | | | | | | | | | | | | | | | | | | On Blackfin SMP, a per-cpu loops_per_jiffy is pointless since both cores always run at the same CCLK. In addition, the current implementation has flaws since the main consumer for loops_per_jiffy (asm/delay.h) uses the global kernel loops_per_jiffy and not the per_cpu one. So punt all of the per-cpu handling and go back to the global shared one. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
| * Blackfin: fix bugs in GPIO resume codeMichael Hennerich2009-07-16
| | | | | | | | | | | | | | | | | | Change the bfin_gpio_pm_hibernate_restore() function to: 1) AND restored DATA with DIR (not OR) to get correct final state 2) Restore DATA before setting DIR to avoid glitches Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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