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2023-04-13dmaengine: remove MODULE_LICENSE in non-modulesNick Alcock1-1/+0
Since commit 8b41fc4454e ("kbuild: create modules.builtin without Makefile.modbuiltin or tristate.conf"), MODULE_LICENSE declarations are used to identify modules. As a consequence, uses of the macro in non-modules will cause modprobe to misidentify their containing object file as a module when it is not (false positives), and modprobe might succeed rather than failing with a suitable error message. So remove it in the files in this commit, none of which can be built as modules. Signed-off-by: Nick Alcock <nick.alcock@oracle.com> Suggested-by: Luis Chamberlain <mcgrof@kernel.org> Cc: Luis Chamberlain <mcgrof@kernel.org> Cc: linux-modules@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: Hitomi Hasegawa <hasegawa-hitomi@fujitsu.com> Cc: Vinod Koul <vkoul@kernel.org> Cc: dmaengine@vger.kernel.org Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
2022-03-10dmaengine: Revert "dmaengine: shdma: Fix runtime PM imbalance on error"Vinod Koul1-3/+1
This reverts commit 455896c53d5b ("dmaengine: shdma: Fix runtime PM imbalance on error") as the patch wrongly reduced the count on error and did not bail out. So drop the count by reverting the patch . Signed-off-by: Vinod Koul <vkoul@kernel.org>
2022-02-15dmaengine: shdma: Fix runtime PM imbalance on errorYongzhi Liu1-1/+3
pm_runtime_get_() increments the runtime PM usage counter even when it returns an error code, thus a matching decrement is needed on the error handling path to keep the counter balanced. Signed-off-by: Yongzhi Liu <lyz_cs@pku.edu.cn> Link: https://lore.kernel.org/r/1642311296-87020-1-git-send-email-lyz_cs@pku.edu.cn Signed-off-by: Vinod Koul <vkoul@kernel.org>
2021-12-17Merge tag 'dmaengine_topic_slave_id_removal_5.17' into nextVinod Koul1-8/+0
Merge the tag dmaengine_topic_slave_id_removal_5.17 into next. This brings in the slave_id removal topic changes
2021-12-17dmaengine: sh: Use bitmap_zalloc() when applicableChristophe JAILLET1-4/+2
'shdma_slave_used' is a bitmap. So use 'bitmap_zalloc()' to simplify code, improve the semantic and avoid some open-coded arithmetic in allocator arguments. Also change the corresponding 'kfree()' into 'bitmap_free()' to keep consistency. Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Link: https://lore.kernel.org/r/3efaf2784424ae3d7411dc47f8b6b03e7bb8c059.1637702701.git.christophe.jaillet@wanadoo.fr Signed-off-by: Vinod Koul <vkoul@kernel.org>
2021-12-17dmaengine: shdma: remove legacy slave_id parsingArnd Bergmann1-8/+0
The slave device is picked through either devicetree or a filter function, and any remaining out-of-tree drivers would have warned about this usage since 2015. Stop interpreting the field finally so it can be removed from the interface. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20211122222203.4103644-6-arnd@kernel.org Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-10-05dmaengine: sh: drop double zeroingJulia Lawall1-1/+1
sg_init_table zeroes its first argument, so the allocation of that argument doesn't have to. the semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression x,n,flags; @@ x = - kcalloc + kmalloc_array (n,sizeof(*x),flags) ... sg_init_table(x,n) // </smpl> Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr> Link: https://lore.kernel.org/r/1600601186-7420-5-git-send-email-Julia.Lawall@inria.fr Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-08-24treewide: Use fallthrough pseudo-keywordGustavo A. R. Silva1-1/+1
Replace the existing /* fall through */ comments and its variants with the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary fall-through markings when it is the case. [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2020-03-23dmaengine: fix spelling mistake "exceds" -> "exceeds"Colin Ian King1-1/+1
There are a couple of spelling mistakes in dev_err error messages. Fix them. Signed-off-by: Colin Ian King <colin.king@canonical.com> Link: https://lore.kernel.org/r/20200316091653.110984-1-colin.king@canonical.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-08-29dmaengine: use SPDX identifier for Renesas driversWolfram Sang1-4/+1
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Simon Horman <horms+renesas@verge.net.au> Signed-off-by: Vinod Koul <vkoul@kernel.org>
2018-06-13treewide: kzalloc() -> kcalloc()Kees Cook1-2/+3
The kzalloc() function has a 2-factor argument form, kcalloc(). This patch replaces cases of: kzalloc(a * b, gfp) with: kcalloc(a * b, gfp) as well as handling cases of: kzalloc(a * b * c, gfp) with: kzalloc(array3_size(a, b, c), gfp) as it's slightly less ugly than: kzalloc_array(array_size(a, b), c, gfp) This does, however, attempt to ignore constant size factors like: kzalloc(4 * 1024, gfp) though any constants defined via macros get caught up in the conversion. Any factors with a sizeof() of "unsigned char", "char", and "u8" were dropped, since they're redundant. The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ type TYPE; expression THING, E; @@ ( kzalloc( - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | kzalloc( - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression COUNT; typedef u8; typedef __u8; @@ ( kzalloc( - sizeof(u8) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(__u8) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(char) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(unsigned char) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(u8) * COUNT + COUNT , ...) | kzalloc( - sizeof(__u8) * COUNT + COUNT , ...) | kzalloc( - sizeof(char) * COUNT + COUNT , ...) | kzalloc( - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( - kzalloc + kcalloc ( - sizeof(TYPE) * (COUNT_ID) + COUNT_ID, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * COUNT_ID + COUNT_ID, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * (COUNT_CONST) + COUNT_CONST, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * COUNT_CONST + COUNT_CONST, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (COUNT_ID) + COUNT_ID, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * COUNT_ID + COUNT_ID, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (COUNT_CONST) + COUNT_CONST, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * COUNT_CONST + COUNT_CONST, sizeof(THING) , ...) ) // 2-factor product, only identifiers. @@ identifier SIZE, COUNT; @@ - kzalloc + kcalloc ( - SIZE * COUNT + COUNT, SIZE , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( kzalloc( - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( kzalloc( - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kzalloc( - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kzalloc( - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ identifier STRIDE, SIZE, COUNT; @@ ( kzalloc( - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) ) // Any remaining multi-factor products, first at least 3-factor products, // when they're not all constants... @@ expression E1, E2, E3; constant C1, C2, C3; @@ ( kzalloc(C1 * C2 * C3, ...) | kzalloc( - (E1) * E2 * E3 + array3_size(E1, E2, E3) , ...) | kzalloc( - (E1) * (E2) * E3 + array3_size(E1, E2, E3) , ...) | kzalloc( - (E1) * (E2) * (E3) + array3_size(E1, E2, E3) , ...) | kzalloc( - E1 * E2 * E3 + array3_size(E1, E2, E3) , ...) ) // And then all remaining 2 factors products when they're not all constants, // keeping sizeof() as the second factor argument. @@ expression THING, E1, E2; type TYPE; constant C1, C2, C3; @@ ( kzalloc(sizeof(THING) * C2, ...) | kzalloc(sizeof(TYPE) * C2, ...) | kzalloc(C1 * C2 * C3, ...) | kzalloc(C1 * C2, ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * (E2) + E2, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * E2 + E2, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (E2) + E2, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * E2 + E2, sizeof(THING) , ...) | - kzalloc + kcalloc ( - (E1) * E2 + E1, E2 , ...) | - kzalloc + kcalloc ( - (E1) * (E2) + E1, E2 , ...) | - kzalloc + kcalloc ( - E1 * E2 + E1, E2 , ...) ) Signed-off-by: Kees Cook <keescook@chromium.org>
2016-08-08dmaengine: sh_shdma-base: convert callback to helper functionDave Jiang1-6/+6
This is in preperation of moving to a callback that provides results to the callback for the transaction. The conversion will maintain current behavior and the driver must convert to new callback mechanism at a later time in order to receive results. Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2015-02-23dmaengine: shdma: use normal interface for passing slave idArnd Bergmann1-20/+53
in dma_slave_config, which is incompatible with the way that the dmaengine API normally works. I've had a closer look at the existing code now and found that all slave drivers that pass a slave_id in dma_slave_config for SH do that right after passing the same ID into shdma_chan_filter, so we can just rely on that. However, the various shdma drivers currently do not remember the slave ID that was passed into the filter function when used in non-DT mode and only check the value to find a matching channel, unlike all other drivers. There might still be drivers that are not part of the kernel that rely on setting the slave_id to some other value, so to be on the safe side, this adds another 'real_slave_id' field to shdma_chan that remembers the ID and uses it when a driver passes a zero slave_id in dma_slave_config, like most drivers do. Eventually, the real_slave_id and slave_id fields should just get merged into one field, but that requires other changes. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2014-12-22dmaengine: sh: Split device_controlMaxime Ripard1-39/+33
Split the device_control callback of the Super-H DMA driver to make use of the newly introduced callbacks, that will eventually be used to retrieve slave capabilities. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2014-11-17dmaengine: shdma: fix a race condition in __ld_cleanup()Yoshihiro Shimoda1-0/+2
This patch fixes a race condition about a list of shdma-base driver. If we don't apply this patch, a dma slave driver (especially a usb peripheral driver) may not be able to start the transfer. If a dma slave driver has a callback, __ld_cleanup() will call the callback before this driver removes the list. After the callback, since the return value of __ld_cleanup() is not zero, shdma_chan_ld_cleanup() calls __ld_cleanup() again. And, __ld_clean() will removes the list. At this time, if a dma slave driver calls dmaengine_submit() before this driver removes the list, this driver will set schan->pm_state to SHDMA_PM_PENDING in shdma_tx_submit(). And then, even if a dma slave driver calls dma_async_issue_pending(), this driver don't start the transfer because the schan->pm_state is SHDMA_PM_PENDING in shdma_issue_pending(). So, this patch adds a new condition in __ld_clean() to check if the schan->pm_state is SHDMA_PM_PENDING or not. Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2014-11-06dmaengine: sh: Remove chancnt affectationsMaxime Ripard1-1/+1
chanctnt is already filled by dma_async_device_register, which uses the channel list to know how much channels there is. Since it's already filled, we can safely remove it from the drivers' probe function. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2014-08-04dmaengine: Remove the context argument to the prep_dma_cyclic operationLaurent Pinchart1-1/+1
The argument is always set to NULL and never used. Remove it. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2014-07-31dmaengine: shdma: Allocate cyclic sg list dynamicallyLaurent Pinchart1-2/+15
The sg list used to prepare cyclic DMA descriptors is currently allocated statically on the stack as an array of 32 elements. This makes the shdma_prep_dma_cyclic() function consume a lot of stack space, as reported by the compiler: drivers/dma/sh/shdma-base.c: In function ‘shdma_prep_dma_cyclic’: drivers/dma/sh/shdma-base.c:715:1: warning: the frame size of 1056 bytes is larger than 1024 bytes [-Wframe-larger-than=] Given the limited Linux kernel stack size, this could lead to stack overflows. Fix the problem by allocating the sg list dynamically. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Simon Horman <horms+renesas@verge.net.au> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2014-07-31dmaengine: shdma: Make channel filter ignore unrelated devicesLaurent Pinchart1-39/+45
The shdma_chan_filter() function relies on the DMA channel being embedded in an shdma_chan structure. If this assumption isn't true, for instance when the system contains DMA channels supported by an unrelated driver, the function will crash. Avoid this by returning false directly when the channel belongs to an unrelated device. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Simon Horman <horms+renesas@verge.net.au> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2014-06-03dmaengine: sh: don't use dynamic static allocationVinod Koul1-1/+9
dynamic stack allocation in kernel is considered bad as kernel stack is low and we get warns on few archs as reported by kbuild test robot >> drivers/dma/sh/shdma-base.c:671:32: sparse: Variable length array is used. >> drivers/dma/sh/shdma-base.c:701:1: warning: 'shdma_prep_dma_cyclic' uses >> dynamic stack allocation [enabled by default] Fix this by making a static array of 32 which should be sufficient for shdma_prep_dma_cyclic which only user in kernel is audio and 32 periods for audio seems quite sufficient atm Reported-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2014-06-03dmaengine: sh: fix print specifier warningsVinod Koul1-1/+1
As documented in Documentation/printk-formats.txt we should use %zu/%zx specifiers for size_t type variables for the code to compile on different architectures. This is uncovered as COMPILE_TEST has been enabled recently for this driver drivers/dma/sh/shdma-base.c: In function 'shdma_prep_dma_cyclic': >> drivers/dma/sh/shdma-base.c:683:4: warning: format '%d' expects argument of >> type 'int', but argument 4 has type 'size_t' [-Wformat=] __func__, buf_len, period_len, slave_id); >> drivers/dma/sh/shdma-base.c:683:4: warning: format '%d' expects argument of >> type 'int', but argument 5 has type 'size_t' [-Wformat=] Reported-by: kbuild test robot <fengguang.wu@intel.com> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2014-06-03dmaengine: sh: make shdma_prep_dma_cyclic staticVinod Koul1-1/+1
kbuild test robot reports that shdma_prep_dma_cyclic should be static, since symbol is not declared, quick check revails that is the case >> drivers/dma/sh/shdma-base.c:660:32: sparse: symbol 'shdma_prep_dma_cyclic' >> was not declared. Should it be static? Reported-by: kbuild test robot <fengguang.wu@intel.com> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2014-05-02DMA: shdma: add cyclic transfer supportKuninori Morimoto1-7/+65
This patch add cyclic transfer support and enables dmaengine_prep_dma_cyclic() Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> [reflown changelog for readablity] Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2014-05-02DMA: shdma: tidyup callback chunk finderKuninori Morimoto1-9/+9
Current shdma is using "last" which indicates last desc which needs to have callback function. But that desc's chunks is always 1, we can use it as finder Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> [reflown changelog for readablity] Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2014-03-06DMA: shdma: Fix warnings due to improper casts and printk formatsLaurent Pinchart1-5/+5
Use the %zu and %pad printk specifiers to print size_t and dma_addr_t variables, and cast pointers to uintptr_t instead of unsigned int where applicable. This fixes warnings on platforms where pointers and/or dma_addr_t have a different size than int Cc: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> Cc: Vinod Koul <vinod.koul@intel.com> Cc: dmaengine@vger.kernel.org Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2013-10-25dmaengine: sh: use DMA_COMPLETE for dma completion statusVinod Koul1-1/+1
Acked-by: Dan Williams <dan.j.williams@intel.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2013-08-27DMA: shdma: switch DT mode to use configuration data from a match tableGuennadi Liakhovetski1-6/+9
This facilitates DMAC DT support by eliminating the need in AUXDATA and avoiding creating complex DT data. This also fits well with DMAC devices, of which SoCs often have multiple identical copies and it is perfectly valid to use a single configuration data set for all of them. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2013-08-27DMA: shdma: switch to managed resource allocationGuennadi Liakhovetski1-9/+2
Switch shdma to using devm_* managed functions for allocation of memory, requesting IRQs, mapping IO resources etc. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2013-07-05DMA: shdma: add DT supportGuennadi Liakhovetski1-6/+20
This patch adds Device Tree support to the shdma driver. No special DT properties are used, only standard DMA DT bindings are implemented. Since shdma controllers reside on SoCs, their configuration is SoC-specific and shall be passed to the driver from the SoC platform data, using the auxdata procedure. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2013-01-20dma: sh/shdma-base.c: remove unnecessary null pointer checkCong Ding1-3/+0
the variable chan is dereferenced in line 635, so it is no reason to check null again in line 641. Signed-off-by: Cong Ding <dinggnu@gmail.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2012-08-01dmaengine: shdma: restore partial transfer calculationGuennadi Liakhovetski1-0/+9
The recent shdma driver split has mistakenly removed support for partial DMA transfer size calculation on forced termination. This patch restores it. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Acked-by: Vinod Koul <vinod.koul@linux.intel.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2012-07-20dma: sh: provide a migration path for slave drivers to stop using .privateGuennadi Liakhovetski1-25/+89
This patch extends the sh dmaengine driver to support the preferred channel selection and configuration method, instead of using the "private" field from struct dma_chan. We add a standard filter function to be used by slave drivers instead of implementing their own ones, and add support for the DMA_SLAVE_CONFIG control operation, which must accompany the new channel selection method. We still support the legacy .private channel allocation method to cater for a smooth driver migration. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> [applied a trvial checkpath fix] Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
2012-07-20dma: sh: use an integer slave ID to improve API compatibilityGuennadi Liakhovetski1-12/+13
Initially struct shdma_slave has been introduced with the only member - an unsigned slave ID - to describe common properties of DMA slaves in an extensible way. However, experience shows, that a slave ID is indeed the only parameter, needed to identify DMA slaves. This is also, what is used by the core dmaengine API in struct dma_slave_config. We switch to using the slave_id directly, instead of passing a pointer to struct shdma_slave to improve compatibility with the core. We also make the slave_id signed for easier error checking. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
2012-07-20dmaengine: shdma: prepare to stop using struct dma_chan::privateGuennadi Liakhovetski1-4/+5
Using struct dma_chan::private is deprecated. To update the shdma driver to stop using it we first have to eliminate internal runtime uses of it. After that we will also be able to stop using it for channel configuration. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
2012-07-13dmaengine: add an shdma-base libraryGuennadi Liakhovetski1-0/+868
This patch extracts code from shdma.c, that does not directly deal with hardware implementation details and can be re-used with diverse DMA controller variants, found on SH-based SoCs. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Cc: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
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