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author | Serge Semin <fancer.lancer@gmail.com> | 2024-08-02 09:50:50 +0200 |
---|---|---|
committer | Vinod Koul <vkoul@kernel.org> | 2024-08-05 18:37:47 +0200 |
commit | d8fa0802f63502c0409d02c6b701d51841a6f1bd (patch) | |
tree | 3756cf68fc493effdd218ccccdb45e3e197eb846 /drivers | |
parent | dmaengine: dw: Define encode_maxburst() above prepare_ctllo() callbacks (diff) | |
download | linux-d8fa0802f63502c0409d02c6b701d51841a6f1bd.tar.xz linux-d8fa0802f63502c0409d02c6b701d51841a6f1bd.zip |
dmaengine: dw: Simplify max-burst calculation procedure
In order to have a more coherent DW AHB DMA slave configuration method -
dwc_config() - let's simplify the source and destination channel max-burst
calculation procedure:
1. Create the max-burst verification method as it has been just done for
the memory and peripheral address widths. Thus the dwc_config() method
will turn to a set of the verification methods execution.
2. Since both the generic DW AHB DMA and Intel iDMA 32-bit engines support
the power-of-2 bursts only, then the specified by the client driver
max-burst values can be converted to being power-of-2 right in the
max-burst verification method.
3. Since max-burst encoded value is required on the CTL_LO fields
calculation stage, the encode_maxburst() callback can be easily dropped
from the dw_dma structure meanwhile the encoding procedure will be
executed right in the CTL_LO register value calculation.
Thus the update will provide the next positive effects: the internal
DMA-slave config structure will contain only the real DMA-transfer config
values, which will be encoded to the DMA-controller register fields only
when it's required on the buffer mapping; the redundant encode_maxburst()
callback will be dropped simplifying the internal HW-abstraction API;
dwc_config() will look more readable executing the verification functions
one-by-one.
Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
Acked-by: Andy Shevchenko <andy@kernel.org>
Link: https://lore.kernel.org/r/20240802075100.6475-6-fancer.lancer@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/dma/dw/core.c | 30 | ||||
-rw-r--r-- | drivers/dma/dw/dw.c | 9 | ||||
-rw-r--r-- | drivers/dma/dw/idma32.c | 9 | ||||
-rw-r--r-- | drivers/dma/dw/regs.h | 1 |
4 files changed, 29 insertions, 20 deletions
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c index b341a6f1b043..32a66f9effd9 100644 --- a/drivers/dma/dw/core.c +++ b/drivers/dma/dw/core.c @@ -779,6 +779,23 @@ bool dw_dma_filter(struct dma_chan *chan, void *param) } EXPORT_SYMBOL_GPL(dw_dma_filter); +static int dwc_verify_maxburst(struct dma_chan *chan) +{ + struct dw_dma_chan *dwc = to_dw_dma_chan(chan); + + dwc->dma_sconfig.src_maxburst = + clamp(dwc->dma_sconfig.src_maxburst, 1U, dwc->max_burst); + dwc->dma_sconfig.dst_maxburst = + clamp(dwc->dma_sconfig.dst_maxburst, 1U, dwc->max_burst); + + dwc->dma_sconfig.src_maxburst = + rounddown_pow_of_two(dwc->dma_sconfig.src_maxburst); + dwc->dma_sconfig.dst_maxburst = + rounddown_pow_of_two(dwc->dma_sconfig.dst_maxburst); + + return 0; +} + static int dwc_verify_p_buswidth(struct dma_chan *chan) { struct dw_dma_chan *dwc = to_dw_dma_chan(chan); @@ -838,7 +855,7 @@ static int dwc_verify_m_buswidth(struct dma_chan *chan) dwc->dma_sconfig.src_addr_width = mem_width; } else if (dwc->dma_sconfig.direction == DMA_DEV_TO_MEM) { reg_width = dwc->dma_sconfig.src_addr_width; - reg_burst = rounddown_pow_of_two(dwc->dma_sconfig.src_maxburst); + reg_burst = dwc->dma_sconfig.src_maxburst; dwc->dma_sconfig.dst_addr_width = min(mem_width, reg_width * reg_burst); } @@ -849,15 +866,13 @@ static int dwc_verify_m_buswidth(struct dma_chan *chan) static int dwc_config(struct dma_chan *chan, struct dma_slave_config *sconfig) { struct dw_dma_chan *dwc = to_dw_dma_chan(chan); - struct dw_dma *dw = to_dw_dma(chan->device); int ret; memcpy(&dwc->dma_sconfig, sconfig, sizeof(*sconfig)); - dwc->dma_sconfig.src_maxburst = - clamp(dwc->dma_sconfig.src_maxburst, 1U, dwc->max_burst); - dwc->dma_sconfig.dst_maxburst = - clamp(dwc->dma_sconfig.dst_maxburst, 1U, dwc->max_burst); + ret = dwc_verify_maxburst(chan); + if (ret) + return ret; ret = dwc_verify_p_buswidth(chan); if (ret) @@ -867,9 +882,6 @@ static int dwc_config(struct dma_chan *chan, struct dma_slave_config *sconfig) if (ret) return ret; - dw->encode_maxburst(dwc, &dwc->dma_sconfig.src_maxburst); - dw->encode_maxburst(dwc, &dwc->dma_sconfig.dst_maxburst); - return 0; } diff --git a/drivers/dma/dw/dw.c b/drivers/dma/dw/dw.c index 628ee1e77505..6766142884b6 100644 --- a/drivers/dma/dw/dw.c +++ b/drivers/dma/dw/dw.c @@ -64,13 +64,13 @@ static size_t dw_dma_block2bytes(struct dw_dma_chan *dwc, u32 block, u32 width) return DWC_CTLH_BLOCK_TS(block) << width; } -static void dw_dma_encode_maxburst(struct dw_dma_chan *dwc, u32 *maxburst) +static inline u8 dw_dma_encode_maxburst(u32 maxburst) { /* * Fix burst size according to dw_dmac. We need to convert them as: * 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3. */ - *maxburst = *maxburst > 1 ? fls(*maxburst) - 2 : 0; + return maxburst > 1 ? fls(maxburst) - 2 : 0; } static u32 dw_dma_prepare_ctllo(struct dw_dma_chan *dwc) @@ -82,11 +82,11 @@ static u32 dw_dma_prepare_ctllo(struct dw_dma_chan *dwc) if (dwc->direction == DMA_MEM_TO_DEV) { sms = dwc->dws.m_master; dms = dwc->dws.p_master; - dmsize = sconfig->dst_maxburst; + dmsize = dw_dma_encode_maxburst(sconfig->dst_maxburst); } else if (dwc->direction == DMA_DEV_TO_MEM) { sms = dwc->dws.p_master; dms = dwc->dws.m_master; - smsize = sconfig->src_maxburst; + smsize = dw_dma_encode_maxburst(sconfig->src_maxburst); } else /* DMA_MEM_TO_MEM */ { sms = dwc->dws.m_master; dms = dwc->dws.m_master; @@ -125,7 +125,6 @@ int dw_dma_probe(struct dw_dma_chip *chip) dw->suspend_chan = dw_dma_suspend_chan; dw->resume_chan = dw_dma_resume_chan; dw->prepare_ctllo = dw_dma_prepare_ctllo; - dw->encode_maxburst = dw_dma_encode_maxburst; dw->bytes2block = dw_dma_bytes2block; dw->block2bytes = dw_dma_block2bytes; diff --git a/drivers/dma/dw/idma32.c b/drivers/dma/dw/idma32.c index 493fcbafa2b8..dac617c183e6 100644 --- a/drivers/dma/dw/idma32.c +++ b/drivers/dma/dw/idma32.c @@ -199,9 +199,9 @@ static size_t idma32_block2bytes(struct dw_dma_chan *dwc, u32 block, u32 width) return IDMA32C_CTLH_BLOCK_TS(block); } -static void idma32_encode_maxburst(struct dw_dma_chan *dwc, u32 *maxburst) +static inline u8 idma32_encode_maxburst(u32 maxburst) { - *maxburst = *maxburst > 1 ? fls(*maxburst) - 1 : 0; + return maxburst > 1 ? fls(maxburst) - 1 : 0; } static u32 idma32_prepare_ctllo(struct dw_dma_chan *dwc) @@ -210,9 +210,9 @@ static u32 idma32_prepare_ctllo(struct dw_dma_chan *dwc) u8 smsize = 0, dmsize = 0; if (dwc->direction == DMA_MEM_TO_DEV) - dmsize = sconfig->dst_maxburst; + dmsize = idma32_encode_maxburst(sconfig->dst_maxburst); else if (dwc->direction == DMA_DEV_TO_MEM) - smsize = sconfig->src_maxburst; + smsize = idma32_encode_maxburst(sconfig->src_maxburst); return DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN | DWC_CTLL_DST_MSIZE(dmsize) | DWC_CTLL_SRC_MSIZE(smsize); @@ -274,7 +274,6 @@ int idma32_dma_probe(struct dw_dma_chip *chip) dw->suspend_chan = idma32_suspend_chan; dw->resume_chan = idma32_resume_chan; dw->prepare_ctllo = idma32_prepare_ctllo; - dw->encode_maxburst = idma32_encode_maxburst; dw->bytes2block = idma32_bytes2block; dw->block2bytes = idma32_block2bytes; diff --git a/drivers/dma/dw/regs.h b/drivers/dma/dw/regs.h index 76654bd13c1a..5969d9cc8d7a 100644 --- a/drivers/dma/dw/regs.h +++ b/drivers/dma/dw/regs.h @@ -327,7 +327,6 @@ struct dw_dma { void (*suspend_chan)(struct dw_dma_chan *dwc, bool drain); void (*resume_chan)(struct dw_dma_chan *dwc, bool drain); u32 (*prepare_ctllo)(struct dw_dma_chan *dwc); - void (*encode_maxburst)(struct dw_dma_chan *dwc, u32 *maxburst); u32 (*bytes2block)(struct dw_dma_chan *dwc, size_t bytes, unsigned int width, size_t *len); size_t (*block2bytes)(struct dw_dma_chan *dwc, u32 block, u32 width); |