linux.git/arch/riscv/kernel/setup.c, branch v4.18 Linux kernel source tree riscv: remove unnecessary of_platform_populate call 2018-07-04T21:12:38+00:00 Rob Herring robh@kernel.org 2018-06-19T21:41:34+00:00 f67f10b8a6c96ab6c1d6946d269e2ca5f9998cc2 The DT core will call of_platform_default_populate, so it is not necessary for arch specific code to call it unless there are custom match entries, auxdata or parent device. Neither of those apply here, so remove the call. Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: linux-riscv@lists.infradead.org Signed-off-by: Rob Herring <robh@kernel.org> Signed-off-by: Palmer Dabbelt <palmer@sifive.com> 
The DT core will call of_platform_default_populate, so it is not
necessary for arch specific code to call it unless there are custom
match entries, auxdata or parent device. Neither of those apply here, so
remove the call.

Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: linux-riscv@lists.infradead.org
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
riscv: add swiotlb support 2018-05-19T06:46:26+00:00 Christoph Hellwig hch@lst.de 2018-04-27T06:43:14+00:00 10314e09d044296bc50dec831aa85b3ae1acedf0 All RISC-V platforms today lack an IOMMU. However, legacy PCI devices sometimes require DMA-memory to be in the low 32 bits. To make this work, we enable the software-based bounce buffers from swiotlb. They only impose overhead when the device in question cannot address the full 64-bit address space, so a perfect fit. This patch assumes that DMA is coherent with the processor and the PCI bus. It also assumes that the processor and devices share a common address space. This is true for all RISC-V platforms so far. [changelog stolen from an earlier patch by Palmer Dabbelt that did the more complicated swiotlb wireup before the recent consolidation] Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Palmer Dabbelt <palmer@sifive.com> 
All RISC-V platforms today lack an IOMMU. However, legacy PCI devices
sometimes require DMA-memory to be in the low 32 bits.  To make this work,
we enable the software-based bounce buffers from swiotlb.  They only impose
overhead when the device in question cannot address the full 64-bit address
space, so a perfect fit.

This patch assumes that DMA is coherent with the processor and the PCI
bus.  It also assumes that the processor and devices share a common
address space. This is true for all RISC-V platforms so far.

[changelog stolen from an earlier patch by Palmer Dabbelt that did the
 more complicated swiotlb wireup before the recent consolidation]

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Palmer Dabbelt <palmer@sifive.com>
Rename sbi_save to parse_dtb to improve code readability 2018-02-20T18:56:26+00:00 Michael Clark michaeljclark@mac.com 2018-02-15T20:30:29+00:00 8b08f50152ff85a4780e5c385d2b65889406e842 The sbi_ prefix would seem to indicate an SBI interface, and save is not very specific. After applying this patch, reading head.S makes more sense. Signed-off-by: Michael Clark <michaeljclark@mac.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com> 
The sbi_ prefix would seem to indicate an SBI interface, and save is not
very specific. After applying this patch, reading head.S makes more sense.

Signed-off-by: Michael Clark <michaeljclark@mac.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
riscv: add ZONE_DMA32 2018-01-31T03:14:27+00:00 Christoph Hellwig hch@lst.de 2018-01-16T08:37:50+00:00 5ec9c4ff0430e33b602cc0ff8ab9dec8ef548d28 This patch allows devices that require memory that can be addressed using 32-bit addresses to work easily on RISC-V systems. The newly improved dma-direct ops will tap into this pool automatically for 32-bit addressing. Based on an earlier patch from Wesley W. Terpstra. CC: Wesley W. Terpstra <terpstra@sifive.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Palmer Dabbelt <palmer@sifive.com> 
This patch allows devices that require memory that can be addressed
using 32-bit addresses to work easily on RISC-V systems.  The newly
improved dma-direct ops will tap into this pool automatically for
32-bit addressing.

Based on an earlier patch from Wesley W. Terpstra.

CC: Wesley W. Terpstra <terpstra@sifive.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
RISC-V: Remove mem_end command line processing 2018-01-31T03:09:53+00:00 Palmer Dabbelt palmer@sifive.com 2017-12-16T19:17:16+00:00 5d44bf2065e169dd857a4207505210fce25743e6 This is just some cruft left over from before the port converted to device tree. The right way to handle memory regions is to specify them in the device tree, which BBL (our simplest bootloader) is already capable of doing. This patch simply removes the cruft. Signed-off-by: Palmer Dabbelt <palmer@sifive.com> 
This is just some cruft left over from before the port converted to
device tree.  The right way to handle memory regions is to specify them
in the device tree, which BBL (our simplest bootloader) is already
capable of doing.  This patch simply removes the cruft.

Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
RISC-V: Remove duplicate command-line parsing logic 2018-01-31T03:09:52+00:00 Michael Clark mjc@sifive.com 2017-12-16T19:17:02+00:00 3e076a7e049267e9c483674d0dd1caaca565dbef builtin_cmdline handling is present in drivers/of/fdt.c so the duplicate logic in arch/riscv/setup.c results in duplication of the builtin command line. e.g. CONFIG_CMDLINE="root=/dev/vda ro" gets appended twice and gives "root=/dev/vda ro root=/dev/vda ro" Before this patch: [ 0.000000] Kernel command line: root=/dev/vda ro root=/dev/vda ro After this patch: [ 0.000000] Kernel command line: root=/dev/vda ro Signed-off-by: Michael Clark <mjc@sifive.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com> 
builtin_cmdline handling is present in drivers/of/fdt.c so the
duplicate logic in arch/riscv/setup.c results in duplication of
the builtin command line. e.g. CONFIG_CMDLINE="root=/dev/vda ro"
gets appended twice and gives "root=/dev/vda ro root=/dev/vda ro"

Before this patch:

[    0.000000] Kernel command line: root=/dev/vda ro root=/dev/vda ro

After this patch:

[    0.000000] Kernel command line: root=/dev/vda ro

Signed-off-by: Michael Clark <mjc@sifive.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
RISC-V: Remove unused CONFIG_HVC_RISCV_SBI code 2017-12-11T15:51:09+00:00 Palmer Dabbelt palmer@sifive.com 2017-12-08T19:23:23+00:00 27b0174525325bf18919597016483a709f3372f8 This is code that probably should never have made it into the kernel in the first place: it depends on a driver that hadn't been reviewed yet. During the HVC_SBI_RISCV review process a better way of doing this was suggested, but that means this code is defunct. It's compile-time disabled in 4.15 because the driver isn't in, so I think it's safe to just remove this for now. CC: Greg KH <gregkh@linuxfoundation.org> Signed-off-by: Palmer Dabbelt <palmer@sifive.com> 
This is code that probably should never have made it into the kernel in
the first place: it depends on a driver that hadn't been reviewed yet.
During the HVC_SBI_RISCV review process a better way of doing this was
suggested, but that means this code is defunct.  It's compile-time
disabled in 4.15 because the driver isn't in, so I think it's safe to
just remove this for now.

CC: Greg KH <gregkh@linuxfoundation.org>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
RISC-V: Export some expected symbols for modules 2017-11-30T18:01:10+00:00 Olof Johansson olof@lixom.net 2017-11-30T01:55:16+00:00 24948b7ec0f31d36dc900088b140c4f9551b6f56 These are the ones needed by current allmodconfig, so add them instead of everything other architectures are exporting -- the rest can be added on demand later if needed. Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Palmer Dabbelt <palmer@sifive.com> 
These are the ones needed by current allmodconfig, so add them instead
of everything other architectures are exporting -- the rest can be
added on demand later if needed.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
RISC-V: move empty_zero_page definition to C and export it 2017-11-30T18:01:10+00:00 Olof Johansson olof@lixom.net 2017-11-30T01:55:15+00:00 83e7b8769a08987f47117f3a065de153c839a0a8 Needed by some modules (exported by other architectures). Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Palmer Dabbelt <palmer@sifive.com> 
Needed by some modules (exported by other architectures).

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
RISC-V: Init and Halt Code 2017-09-26T22:26:44+00:00 Palmer Dabbelt palmer@dabbelt.com 2017-07-11T01:00:26+00:00 76d2a0493a17d4c8ecc781366850c3c4f8e1a446 This contains the various __init C functions, the initial assembly kernel entry point, and the code to reset the system. When a file was init-related this patch contains the entire file. Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com> 
This contains the various __init C functions, the initial assembly
kernel entry point, and the code to reset the system.  When a file was
init-related this patch contains the entire file.

Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>