summaryrefslogtreecommitdiff
path: root/drivers/dma
AgeCommit message (Collapse)Author
2011-01-17Merge branch 'next' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx: (63 commits) ARM: PL08x: cleanup comments Update CONFIG_MD_RAID6_PQ to CONFIG_RAID6_PQ in drivers/dma/iop-adma.c ARM: PL08x: fix a warning Fix dmaengine_submit() return type dmaengine: at_hdmac: fix race while monitoring channel status dmaengine: at_hdmac: flags located in first descriptor dmaengine: at_hdmac: use subsys_initcall instead of module_init dmaengine: at_hdmac: no need set ACK in new descriptor dmaengine: at_hdmac: trivial add precision to unmapping comment dmaengine: at_hdmac: use dma_address to program DMA hardware pch_dma: support new device ML7213 IOH ARM: PL08x: prevent dma_set_runtime_config() reconfiguring memcpy channels ARM: PL08x: allow dma_set_runtime_config() to return errors ARM: PL08x: fix locking between prepare function and submit function ARM: PL08x: introduce 'phychan_hold' to hold on to physical channels ARM: PL08x: put txd's on the pending list in pl08x_tx_submit() ARM: PL08x: rename 'desc_list' as 'pend_list' ARM: PL08x: implement unmapping of memcpy buffers ARM: PL08x: store prep_* flags in async_tx structure ARM: PL08x: shrink srcbus/dstbus in txd structure ...
2011-01-17ARM: PL08x: cleanup commentsRussell King - ARM Linux
Cleanup the formatting of comments, remove some which don't make sense anymore. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> [fix conflict with 96a608a4] Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-15Update CONFIG_MD_RAID6_PQ to CONFIG_RAID6_PQ in drivers/dma/iop-adma.cWei Yongquan
Commit f5e70d0fe3ea990cfb3fc8d7f76a719adcb1e0b5 renamed MD_RAID6_PQ to RAID6_PQ, but iop-adma.c didn't update synchronously. Signed-off-by: Wei Yongquan <weiyqlq@gmail.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-15dmaengine: at_hdmac: fix race while monitoring channel statusNicolas Ferre
We were reading channel status then taking a lock. This lead to a race because this lock may delay us and then make this channel not idle anymore. Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-15dmaengine: at_hdmac: flags located in first descriptorNicolas Ferre
Place flags on first descriptor of chain instead of last. This is the one used by atc_chain_complete() function while unmapping. Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-15dmaengine: at_hdmac: use subsys_initcall instead of module_initEric Xu
Use subsys_initcall instead of module_init in order to keep DMA engine rolling before other peripheral drivers. Signed-off-by: Eric Xu <hong.xu@atmel.com> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-15dmaengine: at_hdmac: no need set ACK in new descriptorNicolas Ferre
Following descriptor flow in at_hdmac driver, descriptor comming from atc_desc_get() as already DMA_CTRL_ACK flag set. No need to set it again. Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-15dmaengine: at_hdmac: trivial add precision to unmapping commentNicolas Ferre
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-15dmaengine: at_hdmac: use dma_address to program DMA hardwareNicolas Ferre
In atc_prep_slave_sg() function we use dma_address field of scatterlist with sg_dma_address() macro instead of sg_phys(). DMA address is already computed by dma_map_sg() or another mapping function in calling driver. Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-15pch_dma: support new device ML7213 IOHTomoya MORINAGA
Support new device OKI SEMICONDUCTOR's ML7213 IOH(Input/Output Hub) which is for IVI(In-Vehicle Infotainment) use. The ML7213 is companion chip for Intel Atom E6xx series. The ML7213 is completely compatible for Intel EG20T PCH. Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-13Merge branch 'for-next' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (43 commits) Documentation/trace/events.txt: Remove obsolete sched_signal_send. writeback: fix global_dirty_limits comment runtime -> real-time ppc: fix comment typo singal -> signal drivers: fix comment typo diable -> disable. m68k: fix comment typo diable -> disable. wireless: comment typo fix diable -> disable. media: comment typo fix diable -> disable. remove doc for obsolete dynamic-printk kernel-parameter remove extraneous 'is' from Documentation/iostats.txt Fix spelling milisec -> ms in snd_ps3 module parameter description Fix spelling mistakes in comments Revert conflicting V4L changes i7core_edac: fix typos in comments mm/rmap.c: fix comment sound, ca0106: Fix assignment to 'channel'. hrtimer: fix a typo in comment init/Kconfig: fix typo anon_inodes: fix wrong function name in comment fix comment typos concerning "consistent" poll: fix a typo in comment ... Fix up trivial conflicts in: - drivers/net/wireless/iwlwifi/iwl-core.c (moved to iwl-legacy.c) - fs/ext4/ext4.h Also fix missed 'diabled' typo in drivers/net/bnx2x/bnx2x.h while at it.
2011-01-12Merge branch 'next' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (72 commits) powerpc/pseries: Fix build of topology stuff without CONFIG_NUMA powerpc/pseries: Fix VPHN build errors on non-SMP systems powerpc/83xx: add mpc8308_p1m DMA controller device-tree node powerpc/83xx: add DMA controller to mpc8308 device-tree node powerpc/512x: try to free dma descriptors in case of allocation failure powerpc/512x: add MPC8308 dma support powerpc/512x: fix the hanged dma transfer issue powerpc/512x: scatter/gather dma fix powerpc/powermac: Make auto-loading of therm_pm72 possible of/address: Use propper endianess in get_flags powerpc/pci: Use printf extension %pR for struct resource powerpc: Remove unnecessary casts of void ptr powerpc: Disable VPHN polling during a suspend operation powerpc/pseries: Poll VPA for topology changes and update NUMA maps powerpc: iommu: Add device name to iommu error printks powerpc: Record vma->phys_addr in ioremap() powerpc: Update compat_arch_ptrace powerpc: Fix PPC_PTRACE_SETHWDEBUG on PPC_BOOK3S powerpc/time: printk time stamp init not correct powerpc: Minor cleanups for machdep.h ...
2011-01-07Merge branches 'amba' and 'dma40' into dmaengineDan Williams
2011-01-07dma: shdma: don't register the global die notifier multiple timesGuennadi Liakhovetski
A recent patch has added a die notifier to the shdma driver, however, it registers a static die-notifier object in the probe routine, i.e., for each device instance. This is wrong and leads to a system lockup. This patch moves the die notifier registration to module init and exit routines respectively. Reported-by: Magnus Damm <damm@opensource.se> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2011-01-07Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds
* 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm: (416 commits) ARM: DMA: add support for DMA debugging ARM: PL011: add DMA burst threshold support for ST variants ARM: PL011: Add support for transmit DMA ARM: PL011: Ensure IRQs are disabled in UART interrupt handler ARM: PL011: Separate hardware FIFO size from TTY FIFO size ARM: PL011: Allow better handling of vendor data ARM: PL011: Ensure error flags are clear at startup ARM: PL011: include revision number in boot-time port printk ARM: vexpress: add sched_clock() for Versatile Express ARM i.MX53: Make MX53 EVK bootable ARM i.MX53: Some bug fix about MX53 MSL code ARM: 6607/1: sa1100: Update platform device registration ARM: 6606/1: sa1100: Fix platform device registration ARM i.MX51: rename IPU irqs ARM i.MX51: Add ipu clock support ARM: imx/mx27_3ds: Add PMIC support ARM: DMA: Replace page_to_dma()/dma_to_page() with pfn_to_dma()/dma_to_pfn() mx51: fix usb clock support MX51: Add support for usb host 2 arch/arm/plat-mxc/ehci.c: fix errors/typos ...
2011-01-06Merge branch 'devel-stable' into develRussell King
Conflicts: arch/arm/mach-pxa/clock.c arch/arm/mach-pxa/clock.h
2011-01-06Merge branch 'master' of ↵Paul Mundt
master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 into sh-latest Conflicts: arch/sh/kernel/cpu/sh2a/clock-sh7201.c Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2011-01-05Merge branch 'for-rmk' of git://git.pengutronix.de/git/imx/linux-2.6 into ↵Russell King
devel-stable
2011-01-05ARM: PL08x: prevent dma_set_runtime_config() reconfiguring memcpy channelsRussell King - ARM Linux
Prevent dma_set_runtime_config() being used to alter the configuration supplied by the platform for memcpy channel configuration. No one should be trying to change this configuration. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: allow dma_set_runtime_config() to return errorsRussell King - ARM Linux
There are cases in dma_set_runtime_config() where we fail to perform the requested action - and we just issue a KERN_ERR message in that case. We have the facility to return an error to the caller, so that is what we should do. When we encounter an error due to invalid parameters, we should not modify driver state. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: fix locking between prepare function and submit functionRussell King - ARM Linux
The PL08x driver holds on to the channel lock with interrupts disabled between the prepare and the subsequent submit API functions. This means that the locking state when the prepare function returns is dependent on whether it suceeeds or not. It did this to ensure that the physical channel wasn't released, and as it used to add the descriptor onto the pending list at prepare time rather than submit time. Now that we have reorganized the code to remove those reasons, we can now safely release the spinlock at the end of preparation and reacquire it in our submit function. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: introduce 'phychan_hold' to hold on to physical channelsRussell King - ARM Linux
Introduce 'phychan_hold' to hold on to physical DMA channels while we're preparing a new descriptor for it. This will be incremented when we allocate a physical channel and set the MUX registers during the preparation of the TXD, and will only be decremented when the TXD is submitted. This prevents the physical channel being given up before the new TXD is placed on the queue. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: put txd's on the pending list in pl08x_tx_submit()Russell King - ARM Linux
Don't place TXDs on the pending list when they're prepared - place them on the list when they're ready to be submitted. Also, only place memcpy requests in the wait state when they're submitted and don't have a physical channel associated. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: rename 'desc_list' as 'pend_list'Russell King - ARM Linux
This 'desc_list' is actually a list of pending descriptors, so name it after its function (pending list) rather than what it contains (descriptors). Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: implement unmapping of memcpy buffersRussell King - ARM Linux
The DMA engine API requires DMA engine implementations to unmap buffers passed into the non-slave DMA methods unless the relevant completion flag is set. We aren't doing this, so implement this facility. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: store prep_* flags in async_tx structureRussell King - ARM Linux
Like other DMA engine drivers do, store the passed flags into the async_tx structure, so they can be checked when the operation completes. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: shrink srcbus/dstbus in txd structureRussell King - ARM Linux
We only need to store the dma address. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: don't manipulate txd->srcbus or txd->dstbus during LLI fillRussell King - ARM Linux
Don't alter any txd->srcbus or txd->dstbus values while building the LLI list. This allows us to see the original dma_addr_t values passed in via the prep_memcpy() method. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: fix fill_bytes calculationRussell King - ARM Linux
The number of bytes we want to fill into any LLI is the minimum of: - number of bytes remaining in the transfer - number of bytes we can transfer in a single LLI - number of bytes we can transfer without overflowing the source boundary - number of bytes we can transfer without overflowing the destination boundary The minimum of the first two is already calculated (target_len). We limit the boundary calculations to this number of bytes, which will then give us the number of bytes we can place into this LLI. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: use min() to calculate target_lenRussell King - ARM Linux
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: ensure pl08x_pre_boundary() works for any value of addrRussell King - ARM Linux
pl08x_pre_boundary() was unsafe with addresses towards the top of memory space: boundary = ((addr >> PL08X_BOUNDARY_SHIFT) + 1) << PL08X_BOUNDARY_SHIFT; This can overflow a 32-bit number, producing zero. When it does: if (boundary < addr + len) return boundary - addr; else return len; results in (boundary - addr) returning either a large positive value. Also if addr + len overflows, this calculation also fails. We can fix this trivially as the only thing we're actually interested in is the value of the least significant PL08X_BOUNDARY_SHIFT bits: boundary_len = PL08X_BOUNDARY_SIZE - (addr & (PL08X_BOUNDARY_SIZE - 1)); gives us the number of bytes before 'addr' becomes a multiple of PL08X_BOUNDARY_SIZE. We can then just take the min() of the two calculated lengths. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: make pl08x_fill_lli_for_desc() return voidRussell King - ARM Linux
We don't need pl08x_fill_lli_for_desc() to return num_llis + 1 as we know that's what it always does. We can just pass in num_llis and use post-increment in the caller. This makes the code slightly easier to read. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: move callback outside spinlock'd regionRussell King - ARM Linux
Calling the callback handler with spinlocks in the tasklet held leads to deadlock when dmaengine functions are called: BUG: spinlock lockup on CPU#0, sh/417, c1870a08 Backtrace: ... [<c017b408>] (do_raw_spin_lock+0x0/0x154) from [<c02c4b98>] (_raw_spin_lock_irqsave+0x54/0x60) [<c02c4b44>] (_raw_spin_lock_irqsave+0x0/0x60) from [<c01f5828>] (pl08x_prep_channel_resources+0x718/0x8b4) [<c01f5110>] (pl08x_prep_channel_resources+0x0/0x8b4) from [<c01f5bb4>] (pl08x_prep_slave_sg+0x120/0x19c) [<c01f5a94>] (pl08x_prep_slave_sg+0x0/0x19c) from [<c01be7a0>] (pl011_dma_tx_refill+0x164/0x224) [<c01be63c>] (pl011_dma_tx_refill+0x0/0x224) from [<c01bf1c8>] (pl011_dma_tx_callback+0x7c/0xc4) [<c01bf14c>] (pl011_dma_tx_callback+0x0/0xc4) from [<c01f4d34>] (pl08x_tasklet+0x60/0x368) [<c01f4cd4>] (pl08x_tasklet+0x0/0x368) from [<c004d978>] (tasklet_action+0xa0/0x100) Dan quoted the documentation: > 2/ Completion callback routines cannot submit new operations.  This >    results in recursion in the synchronous case and spin_locks being >    acquired twice in the asynchronous case. but then followed up to say: > I should clarify, this is the async_memcpy() api requirement which is > not used outside of md/raid5. DMA drivers can and do allow new > submissions from callbacks, and the ones that do so properly move the > callback outside of the driver lock. So let's fix it by moving the callback out of the spinlocked region. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: allow AHB master port selection to be configuredRussell King - ARM Linux
Platforms need to be able to control which AHB master interface is used, as each AHB master interface may be asymetric. Allow the interfaces used for fetching LLIs, memory, and each peripheral to be configured individually. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: move AHB master port selection into prep_* functionsRussell King - ARM Linux
As we initialize the default cctl value in the prep_* functions along with the increment settings, we don't need to repeat the selection of the AHB ports each time we create a LLI entry. Do this in the prep_* functions once per transfer. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: move cctl increment and protection setup to prep_slave_sgRussell King - ARM Linux
We don't need to initialize the cctl increment and protection values in the runtime_config method - we have all the inforamtion to setup these values in prep_slave_sg(). Move their initialization there. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: move default cctl into txd structureRussell King - ARM Linux
Rather than modifying platform data while preparing a transfer, copy the cctl value into the txd structure and modify the value there. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: assign ccfg DMA request signal in prep_phy_channel()Russell King - ARM Linux
There is no need to wait until we start processing a tx descriptor before setting up the DMA request selection in the ccfg register. We know which channel and request will be used in prep_phy_channel(), so setup the ccfg request selection at txd creation time in prep_phy_channel(). Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: move ccfg into txd structureRussell King - ARM Linux
The ccfg register is used to configure the channel parameters - the type and direction of transfer, the flow control signal and IRQ mask enables. The type and direction of transfer is known in the relevent prep_* function where a txd is created. The IRQ mask enables are always set, and the flow control signals are always set when we start processing a txd according to phychan->signal. If we store the ccfg value in the txd structure, we can avoid modifying platform data - and even having it in platform data at all. So, remove it from platform data too. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: avoid duplicating registers in txd and phychan structuresRussell King - ARM Linux
As we now have all the code accessing the phychan {csrc,cdst,clli,cctl, ccfg} members in one function, there's no point storing the data into the struct. Get rid of the struct members. Re-order the register dump in the dev_dbg() to reflect the order we write the registers to the DMA device. The txd {csrc,cdst,clli,cctl} values are duplicates of the lli[0] values, so there's no point duplicating these either. Program the DMAC registers directly from the lli[0] values. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: combine functions to start DMA into one functionRussell King - ARM Linux
There is no need for pl08x_config_phychan_for_txd(), pl08x_set_cregs() and pl08x_enable_phy_chan() to be separate - they are always called in sequence. Combine them into one function. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: clean up LLI lookupRussell King - ARM Linux
As the LLI list is an array, we can use maths to locate which LLI index we're currently at, and then sum up the remaining LLI entries until we reach the end of the list. This makes the code much easier to read, and much less susceptible to falling off the end of the array. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: rename lli.next to lli.lliRussell King - ARM Linux
The LLI pointer in the documentation is placed into the LLI register, so name it LLI rather than 'next'. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: use 'u32' for LLI structure members, not dma_addr_tRussell King - ARM Linux
Use 'u32' for the LLI structure members, which are defined by hardware to be 32-bit. dma_addr_t is much more vague about its actual size. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: use 'size_t' for lengthsRussell King - ARM Linux
Use size_t for variables denoting lengths throughout, and use the 'z' qualifier for printing the value. For safety, add a BUG_ON() in pl08x_fill_lli_for_desc() to catch the remainder potentially becoming negative. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: don't try to use llis_bus as a pointerRussell King - ARM Linux
llis_bus is the DMA address of the LLI array. Casting it to be a pointer just to be able to use pointer arithmetic on it is not nice. We can trivially deal with the places where we do arithmetic on it, and it's actually cleaner this way. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: don't assume that the LLI pointer has the bus bit clearRussell King - ARM Linux
We only want use the address of the LLI pointer when locating the corresponding structure in memory, so clear the master bus selection bit. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: ensure loops use cpu_relax()Russell King - ARM Linux
Tight loops should use cpu_relax() to allow CPUs to reduce power consumption while waiting for events. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: consolidate physical channel release codeRussell King - ARM Linux
Consolidate duplicated channel release code into release_phy_channel() Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-01-05ARM: PL08x: consolidate common txd initializationRussell King - ARM Linux
Consolidate code which allocates and initializes txds. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>