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2015-06-21MIPS: Loongson: Naming style cleanup and reworkHuacai Chen
Currently, code of Loongson-2/3 is under loongson directory and code of Loongson-1 is under loongson1 directory. Besides, there are Kconfig options such as MACH_LOONGSON and MACH_LOONGSON1. This naming style is very ugly and confusing. Since Loongson-2/3 are both 64-bit general- purpose CPU while Loongson-1 is 32-bit SoC, we rename both file names and Kconfig symbols from loongson/loongson1 to loongson64/loongson32. [ralf@linux-mips.org: Resolve a number of simple conflicts.] Signed-off-by: Huacai Chen <chenhc@lemote.com> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Cc: Kelvin Cheung <keguang.zhang@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/9790/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-06-06MIPS: Loongson-3: Fix a cpu-hotplug issue in loongson3_ipi_interrupt()Huacai Chen
setup_per_cpu_areas() only setup __per_cpu_offset[] for each possible cpu, but loongson_sysconf.nr_cpus can be greater than possible cpus (due to reserved_cpus_mask). So in loongson3_ipi_interrupt(), percpu access will touch the original varible in .data..percpu section which has been freed. Without this patch, cpu-hotplug will cause memery corruption. Signed-off-by: Huacai Chen <chenhc@lemote.com> Cc: John Crispin <john@phrozen.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Patchwork: http://patchwork.linux-mips.org/patch/10524/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-20Merge tag 'cpumask-next-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux Pull final removal of deprecated cpus_* cpumask functions from Rusty Russell: "This is the final removal (after several years!) of the obsolete cpus_* functions, prompted by their mis-use in staging. With these function removed, all cpu functions should only iterate to nr_cpu_ids, so we finally only allocate that many bits when cpumasks are allocated offstack" * tag 'cpumask-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux: (25 commits) cpumask: remove __first_cpu / __next_cpu cpumask: resurrect CPU_MASK_CPU0 linux/cpumask.h: add typechecking to cpumask_test_cpu cpumask: only allocate nr_cpumask_bits. Fix weird uses of num_online_cpus(). cpumask: remove deprecated functions. mips: fix obsolete cpumask_of_cpu usage. x86: fix more deprecated cpu function usage. ia64: remove deprecated cpus_ usage. powerpc: fix deprecated CPU_MASK_CPU0 usage. CPU_MASK_ALL/CPU_MASK_NONE: remove from deprecated region. staging/lustre/o2iblnd: Don't use cpus_weight staging/lustre/libcfs: replace deprecated cpus_ calls with cpumask_ staging/lustre/ptlrpc: Do not use deprecated cpus_* functions blackfin: fix up obsolete cpu function usage. parisc: fix up obsolete cpu function usage. tile: fix up obsolete cpu function usage. arm64: fix up obsolete cpu function usage. mips: fix up obsolete cpu function usage. x86: fix up obsolete cpu function usage. ...
2015-04-13Merge branch '4.0-fixes' into mips-for-linux-nextRalf Baechle
2015-04-08MIPS: Respect the ISA level in FCSR handlingMaciej W. Rozycki
Define the central place the default FCSR value is set from, initialised in `cpu_probe'. Determine the FCSR mask applied to values written to the register with CTC1 in the full emulation mode and via ptrace(2), according to the ISA level of processor hardware or the writability of bits 31:18 if actual FPU hardware is used. Software may rely on FCSR bits whose functions our emulator does not implement, so it should not allow them to be set or software may get confused. For ptrace(2) it's just sanity. [ralf@linux-mips.org: Fixed double inclusion of <asm/current.h>.] Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9711/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-01MIPS: Loongson-3: remove deprecated IRQF_DISABLEDMichael Opdenacker
This removes the use of the IRQF_DISABLED flag from arch/mips/loongson/loongson-3/hpet.c It's a NOOP since 2.6.35. Signed-off-by: Michael Opdenacker <michael.opdenacker@free-electrons.com> Cc: chenhc@lemote.com Cc: taohl@lemote.com Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/9609/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-03-25MIPS: Loongson-3: Add IRQF_NO_SUSPEND to Cascade irqactionHuacai Chen
HPET irq is routed to i8259 and then to MIPS CPU irq (cascade). After commit a3e6c1eff5 (MIPS: IRQ: Fix disable_irq on CPU IRQs), if without IRQF_NO_SUSPEND in cascade_irqaction, HPET interrupts will lost during suspend. The result is machine cannot be waken up. Signed-off-by: Huacai Chen <chenhc@lemote.com> Cc: <stable@vger.kernel.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/9528/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-03-05mips: fix up obsolete cpu function usage.Rusty Russell
Thanks to spatch, plus manual removal of "&*". Then a sweep for for_each_cpu_mask => for_each_cpu. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Kevin Cernekee <cernekee@gmail.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: linux-mips@linux-mips.org
2014-11-24MIPS: Loongson-3: Add RS780/SBX00 HPET supportHuacai Chen
CPUFreq driver need external timer, so add hpet at first. In Loongson 3, only Core-0 can receive external interrupt. As a result, timekeeping cannot absolutely use HPET timer. We use a hybrid solution: Core-0 use HPET as its clock event device, but other cores still use MIPS; clock source is global and doesn't need interrupt, so use HPET. Signed-off-by: Huacai Chen <chenhc@lemote.com> Signed-off-by: Hongliang Tao <taohl@lemote.com> Cc: John Crispin <john@phrozen.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/8329/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-11-24MIPS: Loongson: Improve LEFI firmware interfaceHuacai Chen
Machtypes of Loongson-3 machines become more and more, but there are only small differences among different machtypes. Keeping a large table of machtypes is very ugly and hard to extend. We found that the major machtype differences are UARTs information (number of UARTs, UART IRQs, UART clocks, etc.), platform devices (EC, temperature sensors, fan controllers, etc.) and some workarounds (because of some CPU bugs or mainboard bugs). In this patch we improve the UEFI-like (LEFI) interface to make all Loongson-3 machines use a same machtype "generic-loongson-machine". Signed-off-by: Huacai Chen <chenhc@lemote.com> Cc: John Crispin <john@phrozen.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/8324/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-11-24MIPS: Loongson: Allow booting from any coreHuacai Chen
By offering Logical->Physical core id mapping, so as to reserve some physical cores via mask. This allow booting from any core when core-0 has problems. Since the maximun cores supported by Loongson-3 is 16, 32-bit cpu_startup_core_id can be split to 16-bit cpu_startup_core_id and 16-bit reserved_cores_mask for compatibility. Signed-off-by: Huacai Chen <chenhc@lemote.com> Cc: John Crispin <john@phrozen.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/8323/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-11-19MIPS: Loongson3: Fix __node_distances undefined errorJames Cowgill
export the __node_distances symbol in the loongson3 numa code to fix the build error: Building modules, stage 2. MODPOST 221 modules ERROR: "__node_distances" [drivers/block/nvme.ko] undefined! scripts/Makefile.modpost:90: recipe for target '__modpost' failed when building the kernel with: CONFIG_CPU_LOONGSON3=y CONFIG_NUMA=y CONFIG_BLK_DEV_NVME=m Signed-off-by: James Cowgill <James.Cowgill@imgtec.com> Cc: <stable@vger.kernel.org> # v3.17+ Reviewed-by: James Hogan <james.hogan@imgtec.com> Reviewed-by: Huacai Chen <chenhc@lemote.com> Cc: linux-mips@linux-mips.org Cc: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Patchwork: https://patchwork.linux-mips.org/patch/8444/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-10-15Merge branch 'for-3.18-consistent-ops' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu Pull percpu consistent-ops changes from Tejun Heo: "Way back, before the current percpu allocator was implemented, static and dynamic percpu memory areas were allocated and handled separately and had their own accessors. The distinction has been gone for many years now; however, the now duplicate two sets of accessors remained with the pointer based ones - this_cpu_*() - evolving various other operations over time. During the process, we also accumulated other inconsistent operations. This pull request contains Christoph's patches to clean up the duplicate accessor situation. __get_cpu_var() uses are replaced with with this_cpu_ptr() and __this_cpu_ptr() with raw_cpu_ptr(). Unfortunately, the former sometimes is tricky thanks to C being a bit messy with the distinction between lvalues and pointers, which led to a rather ugly solution for cpumask_var_t involving the introduction of this_cpu_cpumask_var_ptr(). This converts most of the uses but not all. Christoph will follow up with the remaining conversions in this merge window and hopefully remove the obsolete accessors" * 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: (38 commits) irqchip: Properly fetch the per cpu offset percpu: Resolve ambiguities in __get_cpu_var/cpumask_var_t -fix ia64: sn_nodepda cannot be assigned to after this_cpu conversion. Use __this_cpu_write. percpu: Resolve ambiguities in __get_cpu_var/cpumask_var_t Revert "powerpc: Replace __get_cpu_var uses" percpu: Remove __this_cpu_ptr clocksource: Replace __this_cpu_ptr with raw_cpu_ptr sparc: Replace __get_cpu_var uses avr32: Replace __get_cpu_var with __this_cpu_write blackfin: Replace __get_cpu_var uses tile: Use this_cpu_ptr() for hardware counters tile: Replace __get_cpu_var uses powerpc: Replace __get_cpu_var uses alpha: Replace __get_cpu_var ia64: Replace __get_cpu_var uses s390: cio driver &__get_cpu_var replacements s390: Replace __get_cpu_var uses mips: Replace __get_cpu_var uses MIPS: Replace __get_cpu_var uses in FPU emulator. arm: Replace __this_cpu_ptr with raw_cpu_ptr ...
2014-08-26mips: Replace __get_cpu_var usesChristoph Lameter
__get_cpu_var() is used for multiple purposes in the kernel source. One of them is address calculation via the form &__get_cpu_var(x). This calculates the address for the instance of the percpu variable of the current processor based on an offset. Other use cases are for storing and retrieving data from the current processors percpu area. __get_cpu_var() can be used as an lvalue when writing data or on the right side of an assignment. __get_cpu_var() is defined as : #define __get_cpu_var(var) (*this_cpu_ptr(&(var))) __get_cpu_var() always only does an address determination. However, store and retrieve operations could use a segment prefix (or global register on other platforms) to avoid the address calculation. this_cpu_write() and this_cpu_read() can directly take an offset into a percpu area and use optimized assembly code to read and write per cpu variables. This patch converts __get_cpu_var into either an explicit address calculation using this_cpu_ptr() or into a use of this_cpu operations that use the offset. Thereby address calculations are avoided and less registers are used when code is generated. At the end of the patch set all uses of __get_cpu_var have been removed so the macro is removed too. The patch set includes passes over all arches as well. Once these operations are used throughout then specialized macros can be defined in non -x86 arches as well in order to optimize per cpu access by f.e. using a global register that may be set to the per cpu base. Transformations done to __get_cpu_var() 1. Determine the address of the percpu instance of the current processor. DEFINE_PER_CPU(int, y); int *x = &__get_cpu_var(y); Converts to int *x = this_cpu_ptr(&y); 2. Same as #1 but this time an array structure is involved. DEFINE_PER_CPU(int, y[20]); int *x = __get_cpu_var(y); Converts to int *x = this_cpu_ptr(y); 3. Retrieve the content of the current processors instance of a per cpu variable. DEFINE_PER_CPU(int, y); int x = __get_cpu_var(y) Converts to int x = __this_cpu_read(y); 4. Retrieve the content of a percpu struct DEFINE_PER_CPU(struct mystruct, y); struct mystruct x = __get_cpu_var(y); Converts to memcpy(&x, this_cpu_ptr(&y), sizeof(x)); 5. Assignment to a per cpu variable DEFINE_PER_CPU(int, y) __get_cpu_var(y) = x; Converts to __this_cpu_write(y, x); 6. Increment/Decrement etc of a per cpu variable DEFINE_PER_CPU(int, y); __get_cpu_var(y)++ Converts to __this_cpu_inc(y) Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Tejun Heo <tj@kernel.org>
2014-08-19MIPS: Loongson: Fix COP2 usage for preemptible kernelHuacai Chen
In preemptible kernel, only TIF_USEDFPU flag is reliable to distinguish whether _init_fpu()/_restore_fp() is needed. Because the value of the CP0_Status.CU1 isn't changed during preemption. V2: Fix coding style. Signed-off-by: Huacai Chen <chenhc@lemote.com> Cc: John Crispin <john@phrozen.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: Aurelien Jarno <aurelien@aurel32.net> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/7515/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-08-19MIPS: Remove duplicated include from numa.cWei Yongjun
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Cc: Huacai Chen <chenhc@lemote.com> Cc: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/7537/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-07-30MIPS: Loongson-3: Enable the COP2 usageHuacai Chen
Loongson-3 has some specific instructions (MMI/SIMD) in coprocessor 2. COP2 isn't independent because it share COP1 (FPU)'s registers. This patch enable the COP2 usage so user-space programs can use the MMI/SIMD instructions. When COP2 exception happens, we enable both COP1 (FPU) and COP2, only in this way the fp context can be saved and restored correctly. Signed-off-by: Huacai Chen <chenhc@lemote.com> Cc: John Crispin <john@phrozen.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: Aurelien Jarno <aurelien@aurel32.net> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/7189/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-07-30MIPS: Add Loongson-3B supportHuacai Chen
Loongson-3B is a 8-cores processor. In general it looks like there are two Loongson-3A integrated in one chip: 8 cores are separated into two groups (two NUMA node), each node has its own local memory. Of course there are some differences between one Loongson-3B and two Loongson-3A. E.g., the base addresses of IPI registers of each node are not the same; Loongson-3A use ChipConfig register to enable/disable clock, but Loongson-3B use FreqControl register instead. There are two revision of Loongson-3B, the first revision is called as Loongson-3B1000, whose frequency is 1GHz and has a PRid 0x6306, the second revision is called as Loongson-3B1500, whose frequency is 1.5GHz and has a PRid 0x6307. Both revisions has a bug that clock cannot be disabled at runtime, but this will be fixed in future. Signed-off-by: Huacai Chen <chenhc@lemote.com> Cc: John Crispin <john@phrozen.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: Aurelien Jarno <aurelien@aurel32.net> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/7188/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-07-30MIPS: Add NUMA support for Loongson-3Huacai Chen
Multiple Loongson-3A chips can be interconnected with HT0-bus. This is a CC-NUMA system that every chip (node) has its own local memory and cache coherency is maintained by hardware. The 64-bit physical memory address format is as follows: 0x-0000-YZZZ-ZZZZ-ZZZZ The high 16 bits should be 0, which means the real physical address supported by Loongson-3 is 48-bit. The "Y" bits is the base address of each node, which can be also considered as the node-id. The "Z" bits is the address offset within a node, which means every node has a 44 bits address space. Macros XPHYSADDR and MAX_PHYSMEM_BITS are modified unconditionally, because many other MIPS CPUs have also extended their address spaces. Signed-off-by: Huacai Chen <chenhc@lemote.com> Cc: John Crispin <john@phrozen.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: Aurelien Jarno <aurelien@aurel32.net> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/7187/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-07-30MIPS: Loongson: Modify ChipConfig register definitionHuacai Chen
This patch is prepared for Multi-chip interconnection. Since each chip has a ChipConfig register, LOONGSON_CHIPCFG should be an array. Signed-off-by: Huacai Chen <chenhc@lemote.com> Cc: John Crispin <john@phrozen.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: Aurelien Jarno <aurelien@aurel32.net> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/7185/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-05-27MIPS: SMP: Remove plat_smp_ops cpus_done method.Ralf Baechle
Nothing was using the method and there isn't any need for this hook. This leaves smp_cpus_done() empty for the moment. As suggested by Paul Bolle <pebolle@tiscali.nl>. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-03-31MIPS: Loongson 3: Add CPU hotplug supportHuacai Chen
Tips of Loongson's CPU hotplug: 1, To fully shutdown a core in Loongson 3, the target core should go to CKSEG1 and flush all L1 cache entries at first. Then, another core (usually Core 0) can safely disable the clock of the target core. So play_dead() call loongson3_play_dead() via CKSEG1 (both uncached and unmmaped). 2, The default clocksource of Loongson is MIPS. Since clock source is a global device, timekeeping need the CP0' Count registers of each core be synchronous. Thus, when a core is up, we use a SMP_ASK_C0COUNT IPI to ask Core-0's Count. Signed-off-by: Huacai Chen <chenhc@lemote.com> Signed-off-by: Hongliang Tao <taohl@lemote.com> Signed-off-by: Hua Yan <yanh@lemote.com> Tested-by: Alex Smith <alex.smith@imgtec.com> Reviewed-by: Alex Smith <alex.smith@imgtec.com> Cc: John Crispin <john@phrozen.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: Aurelien Jarno <aurelien@aurel32.net> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/6639 Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-03-31MIPS: Loongson 3: Add Loongson-3 SMP supportHuacai Chen
IPI registers of Loongson-3 include IPI_SET, IPI_CLEAR, IPI_STATUS, IPI_EN and IPI_MAILBOX_BUF. Each bit of IPI_STATUS indicate a type of IPI and IPI_EN indicate whether the IPI is enabled. The sender write 1 to IPI_SET bits generate IPIs in IPI_STATUS, and receiver write 1 to bits of IPI_CLEAR to clear IPIs. IPI_MAILBOX_BUF are used to deliver more information about IPIs. Why we change code in arch/mips/loongson/common/setup.c? If without this change, when SMP configured, system cannot boot since it hang at printk() in cgroup_init_early(). The root cause is: console_trylock() \-->down_trylock(&console_sem) \-->raw_spin_unlock_irqrestore(&sem->lock, flags) \-->_raw_spin_unlock_irqrestore()(SMP/UP have different versions) \-->__raw_spin_unlock_irqrestore() (following is the SMP case) \-->do_raw_spin_unlock() \-->arch_spin_unlock() \-->nudge_writes() \-->mb() \-->wbflush() \-->__wbflush() In previous code __wbflush() is initialized in plat_mem_setup(), but cgroup_init_early() is called before plat_mem_setup(). Therefore, In this patch we make changes to avoid boot failure. Signed-off-by: Huacai Chen <chenhc@lemote.com> Signed-off-by: Hongliang Tao <taohl@lemote.com> Signed-off-by: Hua Yan <yanh@lemote.com> Tested-by: Alex Smith <alex.smith@imgtec.com> Reviewed-by: Alex Smith <alex.smith@imgtec.com> Cc: John Crispin <john@phrozen.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: Aurelien Jarno <aurelien@aurel32.net> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/6638 Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-03-31MIPS: Loongson 3: Add IRQ init and dispatch supportHuacai Chen
IRQ routing path of Loongson-3: Devices(most) --> I8259 --> HT Controller --> IRQ Routing Table --> CPU ^ | Device(legacy devices such as UART) --> Bonito ---| IRQ Routing Table route 32 INTs to CPU's INT0~INT3(IP2~IP5 of CP0), 32 INTs include 16 HT INTs(mostly), 4 PCI INTs, 1 LPC INT, etc. IP6 is used for IPI and IP7 is used for internal MIPS timer. LOONGSON_INT_ROUTER_* are IRQ Routing Table registers. I8259 IRQs are 1:1 mapped to HT1 INTs. LOONGSON_HT1_* are configuration registers of HT1 controller. Signed-off-by: Huacai Chen <chenhc@lemote.com> Signed-off-by: Hongliang Tao <taohl@lemote.com> Signed-off-by: Hua Yan <yanh@lemote.com> Tested-by: Alex Smith <alex.smith@imgtec.com> Reviewed-by: Alex Smith <alex.smith@imgtec.com> Cc: John Crispin <john@phrozen.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: Aurelien Jarno <aurelien@aurel32.net> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/6634 Signed-off-by: Ralf Baechle <ralf@linux-mips.org>