Commit graph

870 commits

Author SHA1 Message Date
Linus Torvalds
32aaeffbd4 Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux
* 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux: (230 commits)
  Revert "tracing: Include module.h in define_trace.h"
  irq: don't put module.h into irq.h for tracking irqgen modules.
  bluetooth: macroize two small inlines to avoid module.h
  ip_vs.h: fix implicit use of module_get/module_put from module.h
  nf_conntrack.h: fix up fallout from implicit moduleparam.h presence
  include: replace linux/module.h with "struct module" wherever possible
  include: convert various register fcns to macros to avoid include chaining
  crypto.h: remove unused crypto_tfm_alg_modname() inline
  uwb.h: fix implicit use of asm/page.h for PAGE_SIZE
  pm_runtime.h: explicitly requires notifier.h
  linux/dmaengine.h: fix implicit use of bitmap.h and asm/page.h
  miscdevice.h: fix up implicit use of lists and types
  stop_machine.h: fix implicit use of smp.h for smp_processor_id
  of: fix implicit use of errno.h in include/linux/of.h
  of_platform.h: delete needless include <linux/module.h>
  acpi: remove module.h include from platform/aclinux.h
  miscdevice.h: delete unnecessary inclusion of module.h
  device_cgroup.h: delete needless include <linux/module.h>
  net: sch_generic remove redundant use of <linux/module.h>
  net: inet_timewait_sock doesnt need <linux/module.h>
  ...

Fix up trivial conflicts (other header files, and  removal of the ab3550 mfd driver) in
 - drivers/media/dvb/frontends/dibx000_common.c
 - drivers/media/video/{mt9m111.c,ov6650.c}
 - drivers/mfd/ab3550-core.c
 - include/linux/dmaengine.h
2011-11-06 19:44:47 -08:00
Linus Torvalds
fba9569924 Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma
* 'next' of git://git.infradead.org/users/vkoul/slave-dma: (63 commits)
  dmaengine: mid_dma: mask_peripheral_interrupt only when dmac is idle
  dmaengine/ep93xx_dma: add module.h include
  pch_dma: Reduce wasting memory
  pch_dma: Fix suspend issue
  dma/timberdale: free_irq() on an error path
  dma: shdma: transfer based runtime PM
  dmaengine: shdma: protect against the IRQ handler
  dmaengine i.MX DMA/SDMA: add missing include of linux/module.h
  dmaengine: delete redundant chan_id and chancnt initialization in dma drivers
  dmaengine/amba-pl08x: Check txd->llis_va before freeing dma_pool
  dmaengine/amba-pl08x: Add support for sg len greater than one for slave transfers
  serial: sh-sci: don't filter on DMA device, use only channel ID
  ARM: SAMSUNG: Remove Samsung specific enum type for dma direction
  ASoC: Samsung: Update DMA interface
  spi/s3c64xx: Merge dma control code
  spi/s3c64xx: Add support DMA engine API
  ARM: SAMSUNG: Remove S3C-PL330-DMA driver
  ARM: S5P64X0: Use generic DMA PL330 driver
  ARM: S5PC100: Use generic DMA PL330 driver
  ARM: S5PV210: Use generic DMA PL330 driver
  ...

Fix up fairly trivial conflicts in
 - arch/arm/mach-exynos4/{Kconfig,clock.c}
 - arch/arm/mach-s5p64x0/dma.c
2011-11-04 18:02:25 -07:00
Guennadi Liakhovetski
1d3564d91f [media] dmaengine: ipu-idmac: add support for the DMA_PAUSE control
To support multi-size buffers in the mx3_camera V4L2 driver we have to be
able to stop DMA on a channel without releasing descriptors and completely
halting the hardware. Use the DMA_PAUSE control to implement this mode.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Vinod Koul <vinod.koul@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-11-03 18:28:33 -02:00
Paul Gortmaker
f492b21027 drivers/dma: Add export.h to ste_dma40.c
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-31 19:31:44 -04:00
Paul Gortmaker
5c45ad77ff drivers/dma: Add module.h to files implicitly using it.
Fix files that were implicitly using module.h but not
calling it out for inclusion directly.  We'll break those
once we remove the implicit presence otherwise

[With input from Uwe Kleine-König <u.kleine-koenig@pengutronix.de>]

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-31 19:31:44 -04:00
Paul Gortmaker
7c52d55170 x86: fix up files really needing to include module.h
These files aren't just exporting symbols -- they are also defining
a MODULE_LICENSE etc. so give them the full module.h file.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-31 19:30:36 -04:00
Vinod Koul
4598fc2c94 dmaengine: mid_dma: mask_peripheral_interrupt only when dmac is idle
The mask_peripheral_interrupt is called when channel wants to mask the
interrupt. Move this to suspend as this masking affects other channels
as well. Not touching unmask here and unmask would still be done of
first channel use

Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
2011-10-16 17:16:45 +05:30
Mika Westerberg
2389d674bf dmaengine/ep93xx_dma: add module.h include
Due to module.h cleanup it is not anymore included implicitly. Drivers who
want to use it need to include it explicitly.

Signed-off-by: Mika Westerberg <mika.westerberg@iki.fi>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
2011-10-16 13:52:44 +05:30
Tomoya MORINAGA
01631243d7 pch_dma: Reduce wasting memory
nr_channels is defined in "struct pch_dma".
and struct pch_dma_chan is defined in "struct pch_dma".
So, "sizeof(struct pch_dma_chan) * nr_channels" is unnecessary.

Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.lapis-semi.com>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
2011-10-12 10:51:24 +05:30
Tomoya MORINAGA
c43f150868 pch_dma: Fix suspend issue
Currently, executing suspend/hibernation,
memory access violation occurs.

In pch_dma_save_regs() called by suspend(),
you can see the following code.

static void pch_dma_save_regs(struct pch_dma *pd)
{
snip...
        list_for_each_entry_safe(chan, _c, &pd->dma.channels, device_node) {
                pd_chan = to_pd_chan(chan);

                pd->ch_regs[i].dev_addr = channel_readl(pd_chan, DEV_ADDR);
                pd->ch_regs[i].mem_addr = channel_readl(pd_chan, MEM_ADDR);
                pd->ch_regs[i].size = channel_readl(pd_chan, SIZE);
                pd->ch_regs[i].next = channel_readl(pd_chan, NEXT);

                i++;
        }
}

Max loop count is 12 defined at pci_table.
So, this caused memory access violation.

This patch fixes the issue
 - Modify array size (MAX_CHAN_NR)

Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.lapis-semi.com>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
2011-10-11 22:24:36 +05:30
Dan Carpenter
f80befe081 dma/timberdale: free_irq() on an error path
There was an error path that skipped the free_irq() step by mistake.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-10-07 10:23:11 +05:30
Guennadi Liakhovetski
7a1cd9ad87 dma: shdma: transfer based runtime PM
Currently the shdma dmaengine driver uses runtime PM to save power, when
no channel on the specific controller is requested by a user. This patch
switches the driver to count individual DMA transfers. That way the
controller can be powered down between transfers, even if some of its
channels are in use.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
2011-09-28 10:07:40 +05:30
Guennadi Liakhovetski
b4dae6e1ad dmaengine: shdma: protect against the IRQ handler
The IRQ handler of the shdma driver accesses common hardware registers,
that are also accessed from other contexts. Therefore access to them
has to be performed with interrupts disabled, not only with disabled
bottom halves.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
2011-09-28 10:07:25 +05:30
Vinod Koul
0745c9a5e3 Merge branch 'samsung_dma' into next 2011-09-21 11:53:30 +05:30
Axel Lin
f8de8f4ce2 dmaengine i.MX DMA/SDMA: add missing include of linux/module.h
Add missing include of linux/module.h to fix build error.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-09-21 11:29:19 +05:30
Barry Song
463894705e dmaengine: delete redundant chan_id and chancnt initialization in dma drivers
dma_async_device_register will re-init chan_id and chancnt,
so whatever chan_id and chancnt are set in drivers, they will
be re-written by dma_async_device_register.

Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Viresh Kumar <viresh.kumar@st.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Piotr Ziecik <kosmo@semihalf.com>
Cc: Yong Wang <yong.y.wang@intel.com>
Cc: Jaswinder Singh <jassi.brar@samsung.com>
Cc: Pelagicore AB <info@pelagicore.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Acked-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-09-20 11:51:33 +05:30
Viresh Kumar
c12056466d dmaengine/amba-pl08x: Check txd->llis_va before freeing dma_pool
In pl08x_free_txd(), check if pool is allocated successfully before freeing it.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-09-19 15:13:16 +05:30
Viresh Kumar
b7f69d9d42 dmaengine/amba-pl08x: Add support for sg len greater than one for slave transfers
Untill now, sg_len greater than one is not supported. This patch adds support to
do that.

Note: Still, if peripheral is flow controller, sg_len can't be greater that one.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-09-19 15:13:06 +05:30
Boojin Kim
42bc9cf459 DMA: PL330: Add DMA_CYCLIC capability
This patch adds DMA_CYCLIC capability that is used for audio driver.
DMA driver activated with it reuses the dma requests that were submitted
through tx_submit().

Signed-off-by: Boojin Kim <boojin.kim@samsung.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-09-14 11:10:01 +05:30
Boojin Kim
ae43b886f1 DMA: PL330: Remove the start operation for handling DMA_TERMINATE_ALL command
Original code carries out the start operation after flush operation.
But start operation is not required for DMA_TERMINATE_ALL command.
So, this patch removes the unnecessary start operation and only carries out
the flush operation for handling DMA_TERMINATE_ALL command.

Signed-off-by: Boojin Kim <boojin.kim@samsung.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
[Fixed typos in changelog]
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-09-14 11:10:01 +05:30
Boojin Kim
1d0c1d606d DMA: PL330: Support DMA_SLAVE_CONFIG command
Signed-off-by: Boojin Kim <boojin.kim@samsung.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-09-14 11:10:01 +05:30
Boojin Kim
1b9bb715e7 DMA: PL330: Update PL330 DMA API driver
This patch updates following 3 items.
1. Removes unneccessary code.
2. Add AMBA, PL330 configuration
3. Change the meaning of 'peri_id' variable
   from PL330 event number to specific dma id by user.

Signed-off-by: Boojin Kim <boojin.kim@samsung.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-09-14 11:10:01 +05:30
Boojin Kim
a2f5203fec DMA: PL330: Add support runtime PM for PL330 DMAC
Signed-off-by: Boojin Kim <boojin.kim@samsung.com>
Acked-by: Jassi Brar <jassisinghbrar@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-09-14 11:10:00 +05:30
Uwe Kleine-König
289b4e7a48 locking, dma, ipu: Annotate bank_lock as raw
The bank_lock can be taken in atomic context (irq handling)
and therefore cannot be preempted on -rt - annotate it.

In mainline this change documents the low level nature of
the lock - otherwise there's no functional difference. Lockdep
and Sparse checking will work as usual.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: kernel@pengutronix.de
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Link: http://lkml.kernel.org/r/1311949627-13260-1-git-send-email-u.kleine-koenig@pengutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-09-13 11:12:15 +02:00
Russell King - ARM Linux
7703eac96a dmaengine: amba-pl08x: make filter check that the channel is owned by pl08x
Before converting the dma channel to our private data structure, first
check that the channel is indeed one which our driver registered.  We
do this by ensuring that the underlying device is bound to our driver.

This avoids potential oopses if we try to reference 'plchan->name'
against a foreign drivers dma channel.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-09-05 18:57:38 +05:30
Per Forlin
503473ac2a dmaengine/ste_dma40: fix memory leak due to prepared descriptors
Prepared descriptors that are not submitted will not be freed. Add
prepared descriptor to a list to be able to release them upon
dmaengine_terminate_all().

Signed-off-by: Per Forlin <per.forlin@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-09-05 17:11:38 +05:30
Per Forlin
70a207ad4d dmaengine/ste_dma40: fix Oops due to double free of client descriptor
The client list may exist in two lists at the same time. This makes free
fail since the same desc is freed multiple times. Remove desc from
client list when adding it to the pending queue. Move free of client owned
descriptors from free_dma() to terminate_all().

Unable to handle kernel paging request at virtual address 00100104
pgd = dea8c000
[00100104] *pgd=1ea62831, *pte=00000000, *ppte=00000000
Internal error: Oops: 817 [#1] PREEMPT SMP
Modules linked in:
CPU: 0    Not tainted  (3.1.0-rc3+ #58)
PC is at d40_free_chan_resources+0x64/0x330

Signed-off-by: Per Forlin <per.forlin@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-09-05 17:11:21 +05:30
Per Forlin
270e779036 dmaengine/ste_dma40: remove duplicate call to d40_pool_lli_free().
d40_desc_free() already calls d40_pool_lli_free().

Signed-off-by: Per Forlin <per.forlin@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-09-05 17:11:05 +05:30
Per Forlin
89de9f6542 dmaengine/ste_dma40: add missing kernel doc for pending_queue
Signed-off-by: Per Forlin <per.forlin@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-09-05 17:10:39 +05:30
Per Forlin
82babbb361 dmaengine/ste_dma40: fix memory leak due to prepared descriptors
Prepared descriptors that are not submitted will not be freed. Add
prepared descriptor to a list to be able to release them upon
dmaengine_terminate_all().

Signed-off-by: Per Forlin <per.forlin@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-09-05 17:08:26 +05:30
Per Forlin
7404368c22 dmaengine/ste_dma40: fix Oops due to double free of client descriptor
The client list may exist in two lists at the same time. This makes free
fail since the same desc is freed multiple times. Remove desc from
client list when adding it to the pending queue. Move free of client owned
descriptors from free_dma() to terminate_all().

Unable to handle kernel paging request at virtual address 00100104
pgd = dea8c000
[00100104] *pgd=1ea62831, *pte=00000000, *ppte=00000000
Internal error: Oops: 817 [#1] PREEMPT SMP
Modules linked in:
CPU: 0    Not tainted  (3.1.0-rc3+ #58)
PC is at d40_free_chan_resources+0x64/0x330

Signed-off-by: Per Forlin <per.forlin@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-09-05 17:07:58 +05:30
Per Forlin
3b3d5b0f85 dmaengine/ste_dma40: remove duplicate call to d40_pool_lli_free().
d40_desc_free() already calls d40_pool_lli_free().

Signed-off-by: Per Forlin <per.forlin@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-09-05 17:07:28 +05:30
Per Forlin
da063d2609 dmaengine/ste_dma40: add missing kernel doc for pending_queue
Signed-off-by: Per Forlin <per.forlin@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-09-05 17:07:03 +05:30
Vinod Koul
8516f52fa4 Merge branch 'next' into v3.1-rc4
Fixed trivial conflicts  in  drivers/dma/amba-pl08x.c

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-09-02 16:43:44 +05:30
Sascha Hauer
7b4b88e067 dmaengine i.MX SDMA: use request_firmware_nowait
The firmware blob may not be available when the driver
probes. Instead of blocking the whole kernel use
request_firmware_nowait() and continue without firmware.
The ROM scripts can already be used then if available.
For the devicetree case the ROM scripts are not available,
still the probe function should not block. The driver
will be unusable in this case, but we have no way of
detecting this properly. The configuration of the dma
channels will fail, so nothing bad should happen.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-08-29 20:08:53 +05:30
Sascha Hauer
36e2f21ab4 dmaengine i.MX SDMA: set firmware scripts addresses to negative value initially
If we do not have a firmare script for a given transfer,
the setup of this channel must fail. For this the script
addresses have to be < 0 initially, not 0.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-08-29 20:08:37 +05:30
Sascha Hauer
73eab978ad dmaengine i.MX SDMA: lock channel 0
channel0 of the sdma engine is the configuration channel. It
is a shared resource and thus must be protected by a mutex.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-08-29 20:08:26 +05:30
Guennadi Liakhovetski
981ed70d8e dmatest: make dmatest threads freezable
Making dmatest threads freezable allows its use for system PM testing.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-08-29 18:01:27 +05:30
Viresh Kumar
57001a606f dmaengine/amba-pl08x: Call pl08x_free_txd() instead of calling kfree() directly
pl08x_prep_channel_resources() is calling kfree() directly for txd(). To
maintain consistency in code call pl08x_free_txd() instead.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-08-25 19:35:07 +05:30
Viresh Kumar
0a2356572b dmaengine/amba-pl08x: Pass flow controller information with slave channel data
At least, on SPEAr platforms there is one peripheral, JPEG, which can be flow
controller for DMA transfer. Currently DMA controller driver didn't support
peripheral flow controller configurations.

This patch adds device_fc field in struct pl08x_channel_data, which will be used
only for slave transfers and is not used in case of mem2mem transfers.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-08-25 19:33:39 +05:30
Viresh Kumar
036f05fd6d dmaengine/amba-pl08x: Choose peripheral bus as master bus
When we have DMA transfers between peripheral and memory, then we shouldn't
reduce width of peripheral at all, as that may be a strict requirement. But we
can always reduce width of memory access, with some compromise in performance.
Thus, we must select peripheral as master and not memory.

Also this rearranges code to make it shorter.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-08-25 19:33:39 +05:30
Viresh Kumar
e071916580 dmaengine/amba-pl08x: Align lli_len to max(src.width, dst.width)
Currently lli_len is aligned to min of two widths, which looks to be incorrect.
Instead it should be aligned to max of both widths.

Lets say, total_size = 441 bytes

MIN: lets check if min() suits or not:

CASE 1: srcwidth = 1, dstwidth = 4
min(src, dst) = 1

i.e. We program transfer size in control reg to 441.
Now, till 440 bytes everything is fine, but on the last byte DMAC can't transfer
1 byte to dst, as its width is 4.

CASE 2: srcwidth = 4, dstwidth = 1
min(src, dst) = 1

i.e. we program transfer size in control reg to 110 (data transferred = 110 * srcwidth).
So, here too 1 byte is left, but on the source side.

MAX: Lets check if max() suits or not:

CASE 3: srcwidth = 1, dstwidth = 4
max(src, dst) = 4

Aligned size is 440

i.e. We program transfer size in control reg to 440.
Now, all 440 bytes will be transferred without any issues.

CASE 4: srcwidth = 4, dstwidth = 1
max(src, dst) = 4

Aligned size is 440

i.e. We program transfer size in control reg to 110 (data transferred = 110 * srcwidth).
Now, also all 440 bytes will be transferred without any issues.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-08-25 19:33:39 +05:30
Viresh Kumar
03af500f74 dmaengine/amba-pl08x: Add prep_single_byte_llis() routine
Code for creating single byte llis is present at several places. Create a
routine to avoid code redundancy.

Also, we don't need one lli per single byte transfer, we can have single lli to
do all single byte transfer.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-08-25 19:33:39 +05:30
Viresh Kumar
fa6a940bf1 dmaengine/amba-pl08x: max_bytes_per_lli is TRANSFER_SIZE * src_width (not MIN(width))
max_bytes_per_lli = bd.srcbus.buswidth * PL080_CONTROL_TRANSFER_SIZE_MASK;
This is confirmed by ARM support guys.

Below is summary of mail exchange with them:

[Viresh] What is the total data to be transferred in case source and destination
bus widths are different. Suppose, source bus width is 2 bytes and destination
is 4 bytes. Now in order to transfer 80 bytes, what should be value of
TransferSize field in control reg: 40? or 20?.

[David from ARM] The value that is programmed into the TransferSize field should
be the number of <SourceWidth> transfers needed to achieve the required data
transfer.

So, to transfer 80 bytes, with a Source Width of 2, the TransferSize field =
should be programmed with:

        Total transfer size
        ------------------- = 40
          <source width>

[Viresh] Will this change if source is 4 bytes and dest is 2?

[David] Yes - the calculation then becomes:

        Total transfer size
        ------------------- =20
          <source width>

Also, max_bytes_per_lli must be calculated after fixing src and dest widths not
before that. So move this code to the correct place.

This patch also removes max_bytes_per_lli from earlier print message, as till
that point max_bytes_per_lli is unknown.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-08-25 19:33:39 +05:30
Viresh Kumar
16a2e7d359 dmaengine/amba-pl08x: Get rid of pl08x_pre_boundary()
Pl080 Manual says: "Bursts do not cross the 1KB address boundary"

We can program the controller to cross 1 KB boundary on a burst and controller
can take care of this boundary condition by itself.

Following is the discussion with ARM Technical Support Guys (David):
[Viresh] Manual says: "Bursts do not cross the 1KB address boundary"

What does that actually mean? As, Maximum size transferable with a single LLI is
4095 * 4 =16380 ~ 16KB. So, if we don't have src/dest address aligned to burst
size, we can't use this big of an LLI.

[David] There is a difference between bursts describing the total data
transferred by the DMA controller and AHB bursts. Bursts described by the
programmable parameters in the PL080 have no direct connection with the bursts
that are seen on the AHB bus.

The statement that "Bursts do not cross the 1KB address boundary" in the TRM is
referring to AHB bursts, where this limitation is a requirement of the AHB spec.
You can still issue bursts within the PL080 that are in excess of 1KB. The
PL080 will make sure that its bursts are broken down into legal AHB bursts which
will be formatted to ensure that no AHB burst crosses a 1KB boundary.

Based on above discussion, this patch removes all code related to 1 KB boundary
as we are not required to handle this in driver.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-08-25 19:33:38 +05:30
Viresh Kumar
28da28365d dmaengine/amba-pl08x: Schedule tasklet in case of error interrupt
Currently, if error interrupt occurs, nothing is done in interrupt handler (just
clearing the interrupts). We must somehow indicate this to the user that DMA is
over, due to ERR interrupt or TC interrupt.

So, this patch just schedules existing tasklet, with a print showing error
interrupt has occurred on which channels.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-08-25 19:33:38 +05:30
Viresh Kumar
16ca810504 dmaengine/amba-pl08x: No need to check "ch->signal < 0"
We have just executed following in pl08x_get_phy_channel():
	ch->signal = -1;

We don't have to compare "ch->signal < 0", as this will always be true.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-08-25 19:33:38 +05:30
Viresh Kumar
48a59ef357 dmaengine/amba-pl08x: Simplify pl08x_ensure_on()
Simply writing 1 on bit 0 is sufficient instead of reading and clearing bits.
Also as per manual, for bit 3-31 of DMACConfiguration register:
"read undefined, write as 0"

So, we must not rely on values read from this registers bit 3-31.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-08-25 19:33:38 +05:30
Viresh Kumar
b7b6018bad dmaengine/amba-pl08x: support runtime PM
Insert notifiers for the runtime PM API. With this the runtime PM layer kicks in
to action where used.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-08-25 19:33:38 +05:30
Viresh Kumar
175a5e617c dmaengine/amba-pl08x: Changing few prints to dev_dbg from dev_info
For 8 memory and 16 slave channels 35 boot print lines are printed. And that is
too much. Most of this would be more useful for debugging. So moving few of them
to dev_dbg instead of dev_info. Now only 3 prints will be printed.

This also rearrange one of the debug message to fit into two lines.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-08-25 19:33:38 +05:30