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9502ffcda0
linux/drivers/dma
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Stephan Gerhold 9502ffcda0 dmaengine: qcom: bam_dma: Add "powered remotely" mode 
In some configurations, the BAM DMA controller is set up by a remote
processor and the local processor can simply start making use of it
without setting up the BAM. This is already supported using the
"qcom,controlled-remotely" property.

However, for some reason another possible configuration is that the
remote processor is responsible for powering up the BAM, but we are
still responsible for initializing it (e.g. resetting it etc).

This configuration is quite challenging to handle properly because
the power control is handled through separate channels
(e.g. device-specific SMSM interrupts / smem-states). Great care
must be taken to ensure the BAM registers are not accessed while
the BAM is powered off since this results in a bus stall.

Attempt to support this configuration with minimal device-specific
code in the bam_dma driver by tracking the number of requested
channels. Consumers of DMA channels are responsible to only request
DMA channels when the BAM was powered on by the remote processor,
and to release them before the BAM is powered off.

When the first channel is requested the BAM is initialized (reset)
and it is also put into reset when the last channel was released.

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
Link: https://lore.kernel.org/r/20211018102421.19848-3-stephan@gerhold.net
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2021-10-28 22:42:30 +05:30
..
bestcomm dmaengine: bestcomm: fix system boot lockups 2021-10-18 11:43:12 +05:30
dw dmaengine: dw: switch from 'pci_' to 'dma_' API 2021-10-26 10:54:32 +05:30
dw-axi-dmac dmaengine: dw-axi-dmac: set coherent mask 2021-10-18 12:14:20 +05:30
dw-edma dmaengine: dw-edma-pcie: switch from 'pci_' to 'dma_' API 2021-10-26 10:54:23 +05:30
fsl-dpaa2-qdma dmaengine: fsl-dpaa2-qdma: Fix spelling mistake "faile" -> "failed" 2021-08-29 19:14:20 +05:30
hsu dmaengine: hsu: switch from 'pci_' to 'dma_' API 2021-10-26 10:54:47 +05:30
idxd dmaengine: idxd: reconfig device after device reset command 2021-10-25 12:09:15 +05:30
ioat dmaengine: ioat: switch from 'pci_' to 'dma_' API 2021-10-26 10:54:53 +05:30
ipu dmaengine: ipu: Fix fall-through warning for Clang 2021-07-13 14:38:47 -05:00
lgm dmaengine: INTEL_LDMA should depend on X86 2021-02-01 11:27:14 +05:30
mediatek dmaengine: mediatek: use GFP_NOWAIT instead of GFP_ATOMIC in prep_dma 2021-06-07 12:23:47 +05:30
ppc4xx ppc4xx: replace sscanf() by kstrtoul() 2021-07-28 12:40:51 +05:30
ptdma dmaengine: ptdma: remove PT_OFFSET to avoid redefnition 2021-08-29 19:14:21 +05:30
qcom dmaengine: qcom: bam_dma: Add "powered remotely" mode 2021-10-28 22:42:30 +05:30
sf-pdma dmaengine updates for v5.14-rc1 2021-07-05 12:05:13 -07:00
sh dmaengine: sh: make array ds_lut static 2021-10-25 12:15:34 +05:30
ti dmaengine: ti: k3-psil-j721e: Add entry for CSI2RX 2021-08-29 19:14:19 +05:30
xilinx dmaengine: xilinx_dma: Fix kernel-doc warnings 2021-10-25 12:09:15 +05:30
acpi-dma.c dmaengine: acpi: Check for errors from acpi_register_gsi() separately 2021-08-06 21:48:11 +05:30
altera-msgdma.c dmaengine: altera-msgdma: make response port optional 2021-07-28 12:25:10 +05:30
amba-pl08x.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
at_hdmac_regs.h dmaengine: at_hdmac: remove platform data header 2021-01-08 13:57:19 +05:30
at_hdmac.c dmaengine: at_hdmac: remove platform data header 2021-01-08 13:57:19 +05:30
at_xdmac.c dmaengine: at_xdmac: use pm_ptr() 2021-10-18 11:42:07 +05:30
bcm2835-dma.c dmaengine: bcm2835: Drop local dma_parms 2020-09-11 17:42:12 +05:30
bcm-sba-raid.c
dma-axi-dmac.c dmaengine: axi-dmac: Drop local dma_parms 2020-09-11 17:42:12 +05:30
dma-jz4780.c dmaengine: jz4780: Set max number of SGs per burst 2021-10-18 12:07:27 +05:30
dmaengine.c dmaengine: Remove redundant initialization of variable err 2021-10-18 09:38:05 +05:30
dmaengine.h dmaengine: dmaengine_desc_callback_valid(): Check for callback_result 2021-10-25 09:42:56 +05:30
dmatest.c dmaengine: dmatest: Use dmaengine_get_dma_device 2020-12-11 21:20:08 +05:30
ep93xx_dma.c dmaengine: ep93xx: Prepare clock before using it 2021-08-02 12:27:10 +05:30
fsl_raid.c dmaengine: fsl: remove bad channel update 2020-10-05 09:59:17 +05:30
fsl_raid.h
fsl-edma-common.c dmaengine: fsl-edma: fix for missing dmamux module 2021-10-25 12:09:14 +05:30
fsl-edma-common.h dmaengine: fsl-edma-common: correct DSIZE_32BYTE 2020-07-06 10:24:49 +05:30
fsl-edma.c dmaengine: fsl-edma: Fix NULL pointer exception in fsl_edma_tx_handler 2020-06-24 13:05:01 +05:30
fsl-qdma.c dmaengine: fsl-qdma: check dma_set_mask return value 2021-05-10 19:51:03 +05:30
fsldma.c dmaengine: fsldma: Fix a resource leak in an error handling path of the probe function 2021-01-12 18:00:39 +05:30
fsldma.h fsldma: fix very broken 32-bit ppc ioread64 functionality 2020-08-29 13:50:56 -07:00
hisi_dma.c dmaengine: hisi_dma: switch from 'pci_' to 'dma_' API 2021-10-26 10:54:40 +05:30
idma64.c dmaengine: idma64: Switch to use __maybe_unused instead of ifdeffery 2020-11-09 17:21:05 +05:30
idma64.h
img-mdc-dma.c
imx-dma.c dmaengine: imx-dma: configure the generic DMA type to make it work 2021-08-02 12:31:19 +05:30
imx-sdma.c dmaengine: imx-sdma: remove space after sizeof 2021-10-18 12:15:39 +05:30
iop-adma.c Merge branch 'topic/tasklet' into next 2020-10-01 10:18:59 +05:30
iop-adma.h treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
k3dma.c dmaengine: k3dma: use the correct HiSilicon copyright 2021-04-12 17:14:53 +05:30
Kconfig dmaengine: zynqmp_dma: enable COMPILE_TEST 2021-10-01 17:26:30 +05:30
lpc18xx-dmamux.c
Makefile dmaengine: ptdma: Initial driver for the AMD PTDMA 2021-08-29 19:14:20 +05:30
mcf-edma.c dmaengine: mcf-edma: Fix NULL pointer exception in mcf_edma_tx_handler 2020-06-24 13:06:15 +05:30
milbeaut-hdmac.c dmaengine: milbeaut-hdmac: Prefer kcalloc over open coded arithmetic 2021-10-25 12:12:13 +05:30
milbeaut-xdmac.c dmaengine: milbeaut-xdmac: Fix a resource leak in the error handling path of the probe function 2020-12-29 10:08:00 +05:30
mmp_pdma.c dmaengine: mmp_pdma: fix reference count leaks in mmp_pdma_probe 2021-10-25 12:12:58 +05:30
mmp_tdma.c dmaengine: mmp: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:06 +05:30
moxart-dma.c dmaengine: moxart-dma: remove redundant irqsave and irqrestore in hardIRQ 2020-11-09 17:25:54 +05:30
mpc512x_dma.c dmaengine: mpc512x: Fix fall-through warning for Clang 2021-07-14 11:05:55 -05:00
mv_xor_v2.c dmaengine: mv_xor_v2: Fix error return code in mv_xor_v2_probe() 2020-11-24 22:55:15 +05:30
mv_xor.c dmaengine: mv_xor: drop of_match_ptr from of_device_id table 2020-11-24 23:02:20 +05:30
mv_xor.h
mxs-dma.c dmaengine: mxs-dma: Remove the unused .id_table 2020-11-24 22:55:15 +05:30
nbpfaxi.c dmaengine: nbpfaxi: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:06 +05:30
of-dma.c dmaengine: of-dma: router_xlate to return -EPROBE_DEFER if controller is not yet available 2021-07-28 12:54:50 +05:30
owl-dma.c dmaengine: owl-dma: Fix a resource leak in the remove function 2021-01-12 18:00:40 +05:30
pch_dma.c dmaengine: pch_dma: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:06 +05:30
pl330.c dmaengine: pl330: fix wrong usage of spinlock flags in dma_cyclc 2021-05-10 21:38:46 +05:30
plx_dma.c dmaengine: switch from 'pci_' to 'dma_' API 2021-10-26 10:54:57 +05:30
pxa_dma.c dmaengine: pxa_dma: remove redundant irqsave and irqrestore in hardIRQ 2020-11-09 17:25:54 +05:30
s3c24xx-dma.c
sa11x0-dma.c dmaengine: sa11x0: Mark PM functions as __maybe_unused 2021-10-26 10:55:07 +05:30
sprd-dma.c dmaengine: sprd: Add missing MODULE_DEVICE_TABLE 2021-07-15 17:47:38 +05:30
st_fdma.c iov_iter: Move unnecessary inclusion of crypto/hash.h 2020-06-30 09:34:23 -04:00
st_fdma.h
ste_dma40_ll.c
ste_dma40_ll.h
ste_dma40.c dmaengine: stedma40: add missing iounmap() on error in d40_probe() 2021-05-31 09:47:27 +05:30
stm32-dma.c dmaengine: stm32-dma: fix burst in case of unaligned memory address 2021-10-18 12:12:50 +05:30
stm32-dmamux.c dmaengine: stm32-dmamux: Fix PM usage counter unbalance in stm32 dmamux ops 2021-07-28 12:04:12 +05:30
stm32-mdma.c dmaengine: stm32-mdma: Use struct_size() helper in devm_kzalloc() 2021-10-01 17:27:42 +05:30
sun4i-dma.c dmaengine: sun4i: Use list_move_tail instead of list_del/list_add_tail 2021-06-07 17:06:38 +05:30
sun6i-dma.c dmaengine: sun6i: Add support for A100 DMA 2020-11-18 16:28:49 +05:30
tegra20-apb-dma.c dmaengine: tegra20: Fix runtime PM imbalance on error 2021-04-12 15:10:44 +05:30
tegra210-adma.c dmaengine: tegra210-adma: fix pm runtime unbalance in tegra_adma_remove 2021-10-25 10:06:10 +05:30
timb_dma.c dmaengine: timb_dma: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:07 +05:30
TODO
txx9dmac.c dmaengine: txx9dmac: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:07 +05:30
txx9dmac.h
uniphier-mdmac.c
uniphier-xdmac.c dmaengine: uniphier-xdmac: Use readl_poll_timeout_atomic() in atomic state 2021-07-27 18:15:42 +05:30
virt-dma.c dmaengine: virt-dma: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:07 +05:30
virt-dma.h
xgene-dma.c dmaengine: xgene: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:07 +05:30