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path: root/drivers/dma/dma-jz4780.c
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2021-01-26dmaengine: jz4780: Add support for the JZ4760(B)Paul Cercueil1-0/+14
Add support for the JZ4760 and JZ4760B SoCs. Both SoCs have only 5 DMA channels per chip. The JZ4760B introduced the DCKES/DCKEC registers. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Link: https://lore.kernel.org/r/20210120105322.16116-2-paul@crapouillou.net Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-11-24dmaengine: jz4780: drop of_match_ptr from of_device_id tableKrzysztof Kozlowski1-1/+1
The driver can match only via the DT table so the table should be always used and the of_match_ptr does not have any sense (this also allows ACPI matching via PRP0001, even though it is not relevant here). This fixes compile warning (!CONFIG_OF on x86_64): drivers/dma/dma-jz4780.c:1031:34: warning: ‘jz4780_dma_dt_match’ defined but not used [-Wunused-const-variable=] Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Link: https://lore.kernel.org/r/20201120162303.482126-1-krzk@kernel.org Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-10-05dmaengine: dma-jz4780: Fix race in jz4780_dma_tx_statusPaul Cercueil1-3/+4
The jz4780_dma_tx_status() function would check if a channel's cookie state was set to 'completed', and if not, it would enter the critical section. However, in that time frame, the jz4780_dma_chan_irq() function was able to set the cookie to 'completed', and clear the jzchan->vchan pointer, which was deferenced in the critical section of the first function. Fix this race by checking the channel's cookie state after entering the critical function and not before. Fixes: d894fc6046fe ("dmaengine: jz4780: add driver for the Ingenic JZ4780 DMA controller") Cc: stable@vger.kernel.org # v4.0 Signed-off-by: Paul Cercueil <paul@crapouillou.net> Reported-by: Artur Rojek <contact@artur-rojek.eu> Tested-by: Artur Rojek <contact@artur-rojek.eu> Link: https://lore.kernel.org/r/20201004140307.885556-1-paul@crapouillou.net Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-08-25drivers/dma/dma-jz4780: Fix race condition between probe and irq handlerMadhuparna Bhowmik1-19/+19
In probe, IRQ is requested before zchan->id is initialized which can be read in the irq handler. Hence, shift request irq after other initializations complete. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com> Reviewed-by: Paul Cercueil <paul@crapouillou.net> Link: https://lore.kernel.org/r/20200821034423.12713-1-madhuparnabhowmik10@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-01-27Merge tag 'dmaengine-5.6-rc1' of git://git.infradead.org/users/vkoul/slave-dmaLinus Torvalds1-0/+7
Pull dmaengine updates from Vinod Koul: "This time we have a bunch of core changes to support dynamic channels, hotplug of controllers, new apis for metadata ops etc along with new drivers for Intel data accelerators, TI K3 UDMA, PLX DMA engine and hisilicon Kunpeng DMA engine. Also usual assorted updates to drivers. Core: - Support for dynamic channels - Removal of various slave wrappers - Make few slave request APIs as private to dmaengine - Symlinks between channels and slaves - Support for hotplug of controllers - Support for metadata_ops for dma_async_tx_descriptor - Reporting DMA cached data amount - Virtual dma channel locking updates New drivers/device/feature support support: - Driver for Intel data accelerators - Driver for TI K3 UDMA - Driver for PLX DMA engine - Driver for hisilicon Kunpeng DMA engine - Support for eDMA support for QorIQ LS1028A in fsl edma driver - Support for cyclic dma in sun4i driver - Support for X1830 in JZ4780 driver" * tag 'dmaengine-5.6-rc1' of git://git.infradead.org/users/vkoul/slave-dma: (62 commits) dmaengine: Create symlinks between DMA channels and slaves dmaengine: hisilicon: Add Kunpeng DMA engine support dmaengine: idxd: add char driver to expose submission portal to userland dmaengine: idxd: connect idxd to dmaengine subsystem dmaengine: idxd: add descriptor manipulation routines dmaengine: idxd: add sysfs ABI for idxd driver dmaengine: idxd: add configuration component of driver dmaengine: idxd: Init and probe for Intel data accelerators dmaengine: add support to dynamic register/unregister of channels dmaengine: break out channel registration x86/asm: add iosubmit_cmds512() based on MOVDIR64B CPU instruction dmaengine: ti: k3-udma: fix spelling mistake "limted" -> "limited" dmaengine: s3c24xx-dma: fix spelling mistake "to" -> "too" dmaengine: Move dma_get_{,any_}slave_channel() to private dmaengine.h dmaengine: Remove dma_request_slave_channel_compat() wrapper dmaengine: Remove dma_device_satisfies_mask() wrapper dt-bindings: fsl-imx-sdma: Add i.MX8MM/i.MX8MN/i.MX8MP compatible string dmaengine: zynqmp_dma: fix burst length configuration dmaengine: sun4i: Add support for cyclic requests with dedicated DMA dmaengine: fsl-qdma: fix duplicated argument to && ...
2019-12-23dmaengine: JZ4780: Add support for the X1830.周琰杰 (Zhou Yanjie)1-0/+7
Add support for probing the dma-jz4780 driver on the X1830 Soc. Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com> Link: https://lore.kernel.org/r/1576591140-125668-4-git-send-email-zhouyanjie@wanyeetech.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-12-11dmaengine: dma-jz4780: Also break descriptor chains on JZ4725BPaul Cercueil1-1/+2
It turns out that the JZ4725B displays the same buggy behaviour as the JZ4740 that was described in commit f4c255f1a747 ("dmaengine: dma-jz4780: Break descriptor chains on JZ4740"). Work around it by using the same workaround previously used for the JZ4740. Fixes commit f4c255f1a747 ("dmaengine: dma-jz4780: Break descriptor chains on JZ4740") Cc: <stable@vger.kernel.org> Signed-off-by: Paul Cercueil <paul@crapouillou.net> Link: https://lore.kernel.org/r/20191210165545.59690-1-paul@crapouillou.net Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-11-08dmaengine: dma-jz4780: add missed clk_disable_unprepare in removeChuhong Yuan1-0/+1
The remove misses to disable and unprepare jzdma->clk. Add a call to clk_disable_unprepare to fix it. Signed-off-by: Chuhong Yuan <hslester96@gmail.com> Acked-by: Paul Cercueil <paul@crapouillou.net> Link: https://lore.kernel.org/r/20191104161622.11758-1-hslester96@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-11-06dmaengine: JZ4780: Add support for the X1000.Zhou Yanjie1-0/+7
Add support for probing the dma-jz4780 driver on the X1000 Soc. Signed-off-by: Zhou Yanjie <zhouyanjie@zoho.com> Reviewed-by: Paul Cercueil <paul@crapouillou.net> Link: https://lore.kernel.org/r/1571937670-30828-3-git-send-email-zhouyanjie@zoho.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-10-14dmaengine: jz4780: Use devm_platform_ioremap_resource() in jz4780_dma_probe()Markus Elfring1-7/+1
Simplify this function implementation a bit by using a known wrapper function. This issue was detected by using the Coccinelle software. Signed-off-by: Markus Elfring <elfring@users.sourceforge.net> Link: https://lore.kernel.org/r/5dd19f28-349a-4957-ea3a-6aebbd7c97e2@web.de Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-07-31dmaengine: Remove dev_err() usage after platform_get_irq()Stephen Boyd1-3/+1
We don't need dev_err() messages when platform_get_irq() fails now that platform_get_irq() prints an error message itself when something goes wrong. Let's remove these prints with a simple semantic patch. // <smpl> @@ expression ret; struct platform_device *E; @@ ret = ( platform_get_irq(E, ...) | platform_get_irq_byname(E, ...) ); if ( \( ret < 0 \| ret <= 0 \) ) { ( -if (ret != -EPROBE_DEFER) -{ ... -dev_err(...); -... } | ... -dev_err(...); ) ... } // </smpl> While we're here, remove braces on if statements that only have one statement (manually). Cc: Vinod Koul <vkoul@kernel.org> Cc: Dan Williams <dan.j.williams@intel.com> Cc: dmaengine@vger.kernel.org Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Stephen Boyd <swboyd@chromium.org> Link: https://lore.kernel.org/r/20190730181557.90391-11-swboyd@chromium.org Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-07-25dmaengine: dma-jz4780: Break descriptor chains on JZ4740Paul Cercueil1-3/+12
The current driver works perfectly fine on every generation of the JZ47xx SoCs, except on the JZ4740. There, when hardware descriptors are chained together (with the LINK bit set), the next descriptor isn't automatically fetched as it should - instead, an interrupt is raised, even if the TIE bit (Transfer Interrupt Enable) bit is cleared. When it happens, the DMA transfer seems to be stopped (it doesn't chain), and it's uncertain how many bytes have actually been transferred. Until somebody smarter than me can figure out how to make chained descriptors work on the JZ4740, we now disable chained descriptors on that particular SoC. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Link: https://lore.kernel.org/r/20190714215504.10877-1-paul@crapouillou.net Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-07-17Merge tag 'dmaengine-5.3-rc1' of git://git.infradead.org/users/vkoul/slave-dmaLinus Torvalds1-5/+2
Pull dmaengine updates from Vinod Koul: - Add support in dmaengine core to do device node checks for DT devices and update bunch of drivers to use that and remove open coding from drivers - New driver/driver support for new hardware, namely: - MediaTek UART APDMA - Freescale i.mx7ulp edma2 - Synopsys eDMA IP core version 0 - Allwinner H6 DMA - Updates to axi-dma and support for interleaved cyclic transfers - Greg's debugfs return value check removals on drivers - Updates to stm32-dma, hsu, dw, pl330, tegra drivers * tag 'dmaengine-5.3-rc1' of git://git.infradead.org/users/vkoul/slave-dma: (68 commits) dmaengine: Revert "dmaengine: fsl-edma: add i.mx7ulp edma2 version support" dmaengine: at_xdmac: check for non-empty xfers_list before invoking callback Documentation: dmaengine: clean up description of dmatest usage dmaengine: tegra210-adma: remove PM_CLK dependency dmaengine: fsl-edma: add i.mx7ulp edma2 version support dt-bindings: dma: fsl-edma: add new i.mx7ulp-edma dmaengine: fsl-edma-common: version check for v2 instead dmaengine: fsl-edma-common: move dmamux register to another single function dmaengine: fsl-edma: add drvdata for fsl-edma dmaengine: Revert "dmaengine: fsl-edma: support little endian for edma driver" dmaengine: rcar-dmac: Reject zero-length slave DMA requests dmaengine: dw: Enable iDMA 32-bit on Intel Elkhart Lake dmaengine: dw-edma: fix semicolon.cocci warnings dmaengine: sh: usb-dmac: Use [] to denote a flexible array member dmaengine: dmatest: timeout value of -1 should specify infinite wait dmaengine: dw: Distinguish ->remove() between DW and iDMA 32-bit dmaengine: fsl-edma: support little endian for edma driver dmaengine: hsu: Revert "set HSU_CH_MTSR to memory width" dmagengine: pl330: add code to get reset property dt-bindings: pl330: document the optional resets property ...
2019-07-05dmaengine: jz4780: Fix an endian bug in IRQ handlerDan Carpenter1-2/+3
The "pending" variable was a u32 but we cast it to an unsigned long pointer when we do the for_each_set_bit() loop. The problem is that on big endian 64bit systems that results in an out of bounds read. Fixes: 4e4106f5e942 ("dmaengine: jz4780: Fix transfers being ACKed too soon") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-06-08Merge tag 'dmaengine-fix-5.2-rc4' of ↵Linus Torvalds1-11/+21
git://git.infradead.org/users/vkoul/slave-dma Pull dmaengine fixes from Vinod Koul: - jz4780 transfer fix for acking descriptors early - fsl-qdma: clean registers on error - dw-axi-dmac: null pointer dereference fix - mediatek-cqdma: fix sleeping in atomic context - tegra210-adma: fix bunch os issues like crashing in driver probe, channel FIFO configuration etc. - sprd: Fixes for possible crash on descriptor status, block length overflow. For 2-stage transfer fix incorrect start, configuration and interrupt handling. * tag 'dmaengine-fix-5.2-rc4' of git://git.infradead.org/users/vkoul/slave-dma: dmaengine: sprd: Add interrupt support for 2-stage transfer dmaengine: sprd: Fix the right place to configure 2-stage transfer dmaengine: sprd: Fix block length overflow dmaengine: sprd: Fix the incorrect start for 2-stage destination channels dmaengine: sprd: Add validation of current descriptor in irq handler dmaengine: sprd: Fix the possible crash when getting descriptor status dmaengine: tegra210-adma: Fix spelling dmaengine: tegra210-adma: Fix channel FIFO configuration dmaengine: tegra210-adma: Fix crash during probe dmaengine: mediatek-cqdma: sleeping in atomic context dmaengine: dw-axi-dmac: fix null dereference when pointer first is null dmaengine: fsl-qdma: Add improvement dmaengine: jz4780: Fix transfers being ACKed too soon
2019-05-30treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152Thomas Gleixner1-5/+1
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-27dmaengine: dma-jz4780: Let the core do the device node validationBaolin Wang1-5/+2
Let the DMA engine core do the device node validation instead of drivers. Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-05-21dmaengine: jz4780: Fix transfers being ACKed too soonPaul Cercueil1-11/+21
When a multi-descriptor DMA transfer is in progress, the "IRQ pending" flag will apparently be set for that channel as soon as the last descriptor loads, way before the IRQ actually happens. This behaviour has been observed on the JZ4725B, but maybe other SoCs are affected. In the case where another DMA transfer is running into completion on a separate channel, the IRQ handler would then run the completion handler for our previous channel even if the transfer didn't actually finish. Fix this by checking in the completion handler that we're indeed done; if not the interrupted DMA transfer will simply be resumed. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-05-21dmaengine: jz4780: Use SPDX license notifierPaul Cercueil1-5/+1
Use SPDX license notifier instead of plain text in the header. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-01-07dmaengine: dma-jz4780: Use struct_size() in devm_kzalloc()Gustavo A. R. Silva1-3/+2
One of the more common cases of allocation size calculations is finding the size of a structure that has a zero-sized array at the end, along with memory for some number of elements for that array. For example: struct foo { int stuff; void *entry[]; }; instance = devm_kzalloc(dev, sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL); Instead of leaving these open-coded and prone to type mistakes, we can now use the new struct_size() helper: instance = devm_kzalloc(dev, struct_size(instance, entry, count), GFP_KERNEL); This issue was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-10-24Merge branch 'topic/jz' into for-linusVinod Koul1-78/+203
2018-09-11dmaengine: dma-jz4780: Use dma_set_residue()Daniel Silsby1-4/+5
This is the standard method provided by dmaengine header. Signed-off-by: Daniel Silsby <dansilsby@gmail.com> Signed-off-by: Paul Cercueil <paul@crapouillou.net> Tested-by: Mathieu Malaterre <malat@debian.org> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-09-11dmaengine: dma-jz4780: Further residue status fixDaniel Silsby1-1/+1
Func jz4780_dma_desc_residue() expects the index to the next hw descriptor as its last parameter. Caller func jz4780_dma_tx_status(), however, applied modulus before passing it. When the current hw descriptor was last in the list, the index passed became zero. The resulting excess of reported residue especially caused problems with cyclic DMA transfer clients, i.e. ALSA AIC audio output, which rely on this for determining current DMA location within buffer. Combined with the recent and related residue-reporting fixes, spurious ALSA audio underruns on jz4770 hardware are now fixed. Signed-off-by: Daniel Silsby <dansilsby@gmail.com> Signed-off-by: Paul Cercueil <paul@crapouillou.net> Tested-by: Mathieu Malaterre <malat@debian.org> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-09-11dmaengine: dma-jz4780: Set DTCn register explicitlyDaniel Silsby1-0/+9
Normally, we wouldn't set the channel transfer count register directly when using descriptor-driven transfers. However, there is no harm in doing so, and it allows jz4780_dma_desc_residue() to report the correct residue of an ongoing transfer, no matter when it is called. Signed-off-by: Daniel Silsby <dansilsby@gmail.com> Signed-off-by: Paul Cercueil <paul@crapouillou.net> Tested-by: Mathieu Malaterre <malat@debian.org> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-09-11dmaengine: dma-jz4780: Simplify jz4780_dma_desc_residue()Daniel Silsby1-10/+5
Simple cleanup, no changes to actual logic here. Signed-off-by: Daniel Silsby <dansilsby@gmail.com> Signed-off-by: Paul Cercueil <paul@crapouillou.net> Tested-by: Mathieu Malaterre <malat@debian.org> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-09-11dmaengine: dma-jz4780: Add missing residue DTC maskDaniel Silsby1-1/+2
The 'dtc' word in jz DMA descriptors contains two fields: The lowest 24 bits are the transfer count, and upper 8 bits are the DOA offset to next descriptor. The upper 8 bits are now correctly masked off when computing residue in jz4780_dma_desc_residue(). Note that reads of the DTCn hardware reg are automatically masked this way. Signed-off-by: Daniel Silsby <dansilsby@gmail.com> Signed-off-by: Paul Cercueil <paul@crapouillou.net> Tested-by: Mathieu Malaterre <malat@debian.org> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-09-11dmaengine: dma-jz4780: Enable Fast DMA to the AICPaul Cercueil1-2/+3
With the fast DMA bit set, the DMA will transfer twice as much data per clock period to the AIC, so there is little point not to set it. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Tested-by: Mathieu Malaterre <malat@debian.org> Reviewed-by: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-09-11dmaengine: dma-jz4780: Add support for the JZ4725B SoCPaul Cercueil1-3/+20
The JZ4725B has one DMA core starring six DMA channels. As for the JZ4770, each DMA channel's clock can be enabled with a register write, the difference here being that once started, it is not possible to turn it off. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Tested-by: Mathieu Malaterre <malat@debian.org> Reviewed-by: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-09-11dmaengine: dma-jz4780: Add support for the JZ4740 SoCPaul Cercueil1-0/+6
The JZ4740 SoC has a single DMA core starring six DMA channels. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Tested-by: Mathieu Malaterre <malat@debian.org> Reviewed-by: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-09-11dmaengine: dma-jz4780: Add support for the JZ4770 SoCPaul Cercueil1-7/+54
The JZ4770 SoC has two DMA cores, each one featuring six DMA channels. The major change is that each channel's clock can be enabled or disabled through register writes. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Tested-by: Mathieu Malaterre <malat@debian.org> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-09-11dmaengine: dma-jz4780: Use 4-word descriptorsPaul Cercueil1-12/+9
The only information we use in the 8-word version of the hardware DMA descriptor that is not present in the 4-word version is the transfer type, aka. the ID of the source or recipient device. Since the transfer type will never change for a DMA channel in use, we can just set it once for all in the corresponding DMA register before starting any transfer. This has several benefits: * the driver will handle twice as many hardware DMA descriptors; * the driver is closer to support the JZ4740, which only supports 4-word hardware DMA descriptors; * the JZ4770 SoC needs the transfer type to be set in the corresponding DMA register anyway, even if 8-word descriptors are in use. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Tested-by: Mathieu Malaterre <malat@debian.org> Reviewed-by: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-09-11dmaengine: dma-jz4780: Separate chan/ctrl registersPaul Cercueil1-41/+71
The register area of the JZ4780 DMA core can be split into different sections for different purposes: * one set of registers is used to perform actions at the DMA core level, that will generally affect all channels; * one set of registers per DMA channel, to perform actions at the DMA channel level, that will only affect the channel in question. The problem rises when trying to support new versions of the JZ47xx Ingenic SoC. For instance, the JZ4770 has two DMA cores, each one with six DMA channels, and the register sets are interleaved: <DMA0 chan regs> <DMA1 chan regs> <DMA0 ctrl regs> <DMA1 ctrl regs> By using one memory resource for the channel-specific registers and one memory resource for the core-specific registers, we can support the JZ4770, by initializing the driver once per DMA core with different addresses. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Tested-by: Mathieu Malaterre <malat@debian.org> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-09-11dmaengine: dma-jz4780: Avoid hardcoding number of channelsPaul Cercueil1-9/+25
As part of the work to support various other Ingenic JZ47xx SoC versions, which don't feature the same number of DMA channels per core, we now deduce the number of DMA channels available from the devicetree compatible string. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Tested-by: Mathieu Malaterre <malat@debian.org> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-09-11dmaengine: dma-jz4780: Return error if not probed from DTPaul Cercueil1-0/+5
The driver calls clk_get() with the clock name set to NULL, which means that the driver could only work when probed from devicetree. From now on, we explicitly require the driver to be probed from devicetree. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Tested-by: Mathieu Malaterre <malat@debian.org> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-08-29dmaengine: dma-jz4780: use dmaenginem_async_device_register to simplify the codeHuang Shijie1-6/+2
Use dmaenginem_async_device_register to simplify the code: remove dma_async_device_unregister. remove label err_unregister_dev Signed-off-by: Huang Shijie <sjhuang@iluvatar.ai> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2017-12-04dmaengine: dma-jz4780: Use vchan_terminate_vdesc() instead of desc_freePeter Ujfalusi1-1/+9
To avoid race with vchan_complete, use the race free way to terminate running transfer. Implement the device_synchronize callback to make sure that the terminated descriptor is freed. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2016-10-03Merge branch 'topic/compile_test' into for-linusVinod Koul1-1/+1
2016-09-30dmaengine: jz4780: fix resource leaks on error exit returnColin Ian King1-2/+6
In two cases when jz4780_dma_setup_hwdesc fails, there is a memory leak on the allocated desc and associated DMA pools on the error exit return path. Fix this by free'ing the resources before returning. Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2016-09-26dmaengine: jz4780: make jz4780_dma_prep_dma_memcpy staticVinod Koul1-1/+1
Sparse complains: drivers/dma/dma-jz4780.c:399:32: warning: symbol 'jz4780_dma_prep_dma_memcpy' was not declared. Should it be static? So make this static Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2015-08-18dmaengine: jz4780: Kill tasklets before unregistering the deviceAlex Smith1-0/+6
Tasklets may have been scheduled as a result of an earlier interrupt that could still be running. Kill them before unregistering the device. Signed-off-by: Alex Smith <alex.smith@imgtec.com> Cc: Vinod Koul <vinod.koul@intel.com> Cc: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com> Cc: dmaengine@vger.kernel.org Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2015-08-18dmaengine: jz4780: Don't use devm_*_irq() functionsAlex Smith1-4/+8
We must explicitly free the IRQ before the device is unregistered in case any device interrupt still occurs, so there's no point in using the managed variations of the IRQ functions. Change to the regular versions. Signed-off-by: Alex Smith <alex.smith@imgtec.com> Cc: Vinod Koul <vinod.koul@intel.com> Cc: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com> Cc: dmaengine@vger.kernel.org Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2015-08-18dmaengine: jz4780: Ensure channel is on correct controller in filterAlex Smith1-3/+8
When scanning for a free DMA channel, the filter function should ensure that the channel is on the controller that it was requested to be on in the DT. Signed-off-by: Alex Smith <alex.smith@imgtec.com> Cc: Vinod Koul <vinod.koul@intel.com> Cc: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com> Cc: dmaengine@vger.kernel.org Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2015-08-18dmaengine: jz4780: Use dma_get_slave_channel when requesting a specific channelAlex Smith1-2/+7
When the DT requests a specific channel to use it is not necesssary to scan through all DMA channels in the system. Just return the requested channel using dma_get_slave_channel(). Signed-off-by: Alex Smith <alex.smith@imgtec.com> Cc: Vinod Koul <vinod.koul@intel.com> Cc: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com> Cc: dmaengine@vger.kernel.org Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2015-08-18dmaengine: jz4780: Fix error handling/signedness issuesAlex Smith1-16/+17
There are a some signedness bugs such as testing for < 0 on unsigned return values. Additionally there are some cases where functions which should return NULL on error actually return a PTR_ERR value which can result in oopses on error. Fix these issues. Signed-off-by: Alex Smith <alex.smith@imgtec.com> Cc: Vinod Koul <vinod.koul@intel.com> Cc: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com> Cc: dmaengine@vger.kernel.org Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2015-08-18dmaengine: jz4780: Fall back on smaller transfer sizes where necessaryAlex Smith1-14/+23
For some reason the controller does not support 8 byte transfers (but does support all other powers of 2 up to 128). In this case fall back to 4 bytes. In addition, fall back to 128 bytes when any larger power of 2 would be possible within the alignment constraints, as this is the maximum supported. It makes no sense to outright reject 8 or >128 bytes just because the alignment constraints make those the maximum possible size given the parameters for the transaction. For instance, this can result in a DMA from/to an 8 byte aligned address failing. It is perfectly safe to fall back to smaller transfer sizes, the only consequence is reduced transfer efficiency, which is far better than not allowing the transfer at all. Signed-off-by: Alex Smith <alex.smith@imgtec.com> Cc: Vinod Koul <vinod.koul@intel.com> Cc: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com> Cc: dmaengine@vger.kernel.org Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2015-08-18dmaengine: jz4780: Fix up dmaengine API function prototypesAlex Smith1-5/+9
Several function prototypes did not match the dmaengine API they were implementing, resulting in build warnings. Correct these. Signed-off-by: Alex Smith <alex.smith@imgtec.com> Cc: Vinod Koul <vinod.koul@intel.com> Cc: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com> Cc: dmaengine@vger.kernel.org Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2015-08-05dmaengine: Add an enum for the dmaengine alignment constraintsMaxime Ripard1-1/+1
Most drivers need to set constraints on the buffer alignment for async tx operations. However, even though it is documented, some drivers either use a defined constant that is not matching what the alignment variable expects (like DMA_BUSWIDTH_* constants) or fill the alignment in bytes instead of power of two. Add a new enum for these alignments that matches what the framework expects, and convert the drivers to it. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2015-04-01dmaengine: jz4780: add driver for the Ingenic JZ4780 DMA controllerAlex Smith1-0/+877
This patch adds a driver for the DMA controller found in the Ingenic JZ4780. It currently does not implement any support for the programmable firmware feature of the controller - this is not necessary for most uses. It also does not take priority into account when allocating channels, it just allocates the first available channel. This can be implemented later. Signed-off-by: Alex Smith <alex.smith@imgtec.com> Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com> [Updated for dmaengine api changes, Add residue support, couple of minor fixes] Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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