f3573b8f90
Pull OpenRISC updates from Stafford Horne:
"The OpenRISC work is a bit more interesting this time, adding SMP
support and a few general cleanups.
Small Things:
- Move OpenRISC docs into Documentation and clean them up
- Document previously undocumented devicetree bindings
- Update the or1ksim dts to use stdout-path
OpenRISC SMP support details:
- First the "use shadow registers" and "define CPU_BIG_ENDIAN as
true" get the architecture ready for SMP.
- The "add 1 and 2 byte cmpxchg support" and "use qspinlocks and
qrwlocks" add the SMP locking infrastructure as needed. Using the
qspinlocks and qrwlocks as suggested by Peter Z while reviewing the
original spinlocks implementation.
- The "support for ompic" adds a new irqchip device which is used for
IPI communication to support SMP.
- The "initial SMP support" adds smp.c and makes changes to all of
the necessary data-structures to be per-cpu.
The remaining patches are bug fixes and debug helpers which I wanted
to keep separate from the "initial SMP support" in order to allow them
to be reviewed on their own. This includes:
- add cacheflush support to fix icache aliasing
- fix initial preempt state for secondary cpu tasks
- sleep instead of spin on secondary wait
- support framepointers and STACKTRACE_SUPPORT
- enable LOCKDEP_SUPPORT and irqflags tracing
- timer sync: Add tick timer sync logic
- fix possible deadlock in timer sync, pointed out by mips guys
Note: the irqchip patch was reviewed with Marc and we agreed to push
it together with these patches"
* tag 'for-linus' of git://github.com/openrisc/linux:
openrisc: fix possible deadlock scenario during timer sync
openrisc: pass endianness info to sparse
openrisc: add tick timer multi-core sync logic
openrisc: enable LOCKDEP_SUPPORT and irqflags tracing
openrisc: support framepointers and STACKTRACE_SUPPORT
openrisc: add simple_smp dts and defconfig for simulators
openrisc: add cacheflush support to fix icache aliasing
openrisc: sleep instead of spin on secondary wait
openrisc: fix initial preempt state for secondary cpu tasks
openrisc: initial SMP support
irqchip: add initial support for ompic
dt-bindings: add openrisc to vendor prefixes list
openrisc: use qspinlocks and qrwlocks
openrisc: add 1 and 2 byte cmpxchg support
openrisc: use shadow registers to save regs on exception
dt-bindings: openrisc: Add OpenRISC platform SoC
Documentation: openrisc: Updates to README
Documentation: Move OpenRISC docs out of arch/
MAINTAINERS: Add OpenRISC pic maintainer
openrisc: dts: or1ksim: Add stdout-path
57 lines
1.0 KiB
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57 lines
1.0 KiB
Plaintext
// SPDX-License-Identifier: GPL-2.0
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/dts-v1/;
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/ {
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compatible = "opencores,or1ksim";
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#address-cells = <1>;
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#size-cells = <1>;
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interrupt-parent = <&pic>;
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aliases {
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uart0 = &serial0;
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};
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chosen {
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bootargs = "earlycon";
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stdout-path = "uart0:115200";
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};
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memory@0 {
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device_type = "memory";
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reg = <0x00000000 0x02000000>;
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};
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cpus {
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#address-cells = <1>;
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#size-cells = <0>;
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cpu@0 {
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compatible = "opencores,or1200-rtlsvn481";
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reg = <0>;
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clock-frequency = <20000000>;
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};
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};
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/*
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* OR1K PIC is built into CPU and accessed via special purpose
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* registers. It is not addressable and, hence, has no 'reg'
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* property.
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*/
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pic: pic {
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compatible = "opencores,or1k-pic";
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#interrupt-cells = <1>;
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interrupt-controller;
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};
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serial0: serial@90000000 {
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compatible = "opencores,uart16550-rtlsvn105", "ns16550a";
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reg = <0x90000000 0x100>;
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interrupts = <2>;
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clock-frequency = <20000000>;
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};
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enet0: ethoc@92000000 {
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compatible = "opencores,ethmac-rtlsvn338";
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reg = <0x92000000 0x100>;
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interrupts = <4>;
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};
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};
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