Messages in this thread | ![/](/images/icornerl.gif) | | From | Artur Rojek <> | Subject | [PATCH v2 0/3] SuperH DMAC fixes | Date | Sat, 27 May 2023 18:44:49 +0200 |
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Hi all,
This is v2 of the DMAC fixes.
Patch [1/3] now also addresses varying numbers of DMAC modules and channels.
Patch [2/3] removes SH_DMAC_BASE1 for SH4 family. To my knowledge, none of these SoCs feature two DMAC modules.
Patch [3/3] now also sorts all the targets and the description stays within 80 characters per line.
Tested on Jornada 680 (SH7709 compatible).
I went ahead and verified the above changes against datasheets of all the SoCs that are currently supported. Only SoCs found in defconfigs which enable CONFIG_SH_DMA/CONFIG_SH_DMA_API have been surveyed.
---------+--------+--------+--------------+------------------+---------- SoC | Family | Refs. | DMAC modules | Chans per module | Notes ---------+--------+--------+--------------+------------------+---------- SH7724 | SH4A | [1] | 2 | 6 | SH7780 | SH4A | [2] | 2 | 6 | SH7786 | SH4A | [3] | 1 (+ 1) | 6 (+ 4) | #1 SH7091 | SH4 | [4][5] | 1 | 4 | #2 SH7751R | SH4 | [6] | 1 | 8 | SH7760 | SH4 | [7] | 1 | 8 | SH4-202 | SH4 | n/a | ? | ? | #3 SH7709 | SH3 | [8] | 1 | 4 | SH7720 | SH3 | [9] | 1 | 6 | ---------+--------+--------+--------------+------------------+----------
Note #1: Technically, SH7786 features 2 DMAC modules, for a total of 10 channels. However, only DMAC0 (6 channels) is hw register compatible with the existing dma-sh driver.
Note #2: This SoC, used in SEGA Dreamcast, has no publicly available datasheet. Apparently it's an SH7750 [5] derivative. Number of modules/channels has been cross-referenced with the KallistiOS project's source code [4].
Note #3: No publicly available datasheet for this SoC. Apparently this CPU is used in an FPGA-based board [10], so perhaps the DMAC properties are synthesized in FPGA bitstream? As this is SH4, it could potentially impact patch [2/3].
[1] https://www.renesas.com/us/en/document/mat/sh7724-users-manual-hardware p. 537 [2] https://www.renesas.com/us/en/document/mah/sh7780-hardware-manual p. 609 [3] https://www.renesas.com/us/en/document/mah/sh7786-group-users-manual-hardware p. 1081 [4] https://github.com/KallistiOS/KallistiOS/blob/ebf8d528cd8d1909150f60bef98e1a68318cbb95/kernel/arch/dreamcast/include/dc/asic.h#L91-L94 [5] https://www.renesas.com/us/en/document/mah/sh7750-sh7750s-sh7750r-group-users-manual-hardware p. 597 [6] https://www.renesas.com/us/en/document/mah/sh7751-group-sh7751r-group-users-manual-hardware p. 551 [7] https://www.renesas.com/us/en/document/mah/sh7760-group-hardware-manual p. 463 [8] https://www.renesas.com/us/en/document/mah/sh7709s-group-hardware-manual p. 373 [9] https://www.renesas.com/us/en/document/mah/sh7720-group-sh7721-group-users-manual-hardware p. 467 [10] https://web.archive.org/web/20050405021907/http://www.superh.com/products/microdev.htm
Cheers, Artur
Artur Rojek (3): sh: dma: Fix dma channel offset calculation sh: dma: Drop incorrect SH_DMAC_BASE1 for SH4 sh: dma: Correct the number of DMA channels in SH7709
arch/sh/drivers/dma/Kconfig | 14 +++++++----- arch/sh/drivers/dma/dma-sh.c | 37 ++++++++++++++++++++----------- arch/sh/include/cpu-sh4/cpu/dma.h | 1 - 3 files changed, 32 insertions(+), 20 deletions(-)
-- 2.40.1
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