From c014906a870ce70e009def0c9d170ccabeb0be63 Mon Sep 17 00:00:00 2001 From: Guennadi Liakhovetski Date: Thu, 18 Feb 2010 16:30:02 +0000 Subject: [PATCH] dmaengine: shdma: extend .device_terminate_all() to record partial transfer This patch extends the .device_terminate_all() method of the shdma driver to return number of bytes transfered in the current descriptor. Signed-off-by: Guennadi Liakhovetski Signed-off-by: Paul Mundt --- arch/sh/include/asm/dmaengine.h | 20 ++++++++++++++++++++ drivers/dma/shdma.c | 16 ++++++++++++++++ drivers/dma/shdma.h | 16 ---------------- 3 files changed, 36 insertions(+), 16 deletions(-) diff --git a/arch/sh/include/asm/dmaengine.h b/arch/sh/include/asm/dmaengine.h index 9586e4a482b1..bf2f30cf0a27 100644 --- a/arch/sh/include/asm/dmaengine.h +++ b/arch/sh/include/asm/dmaengine.h @@ -10,6 +10,9 @@ #ifndef ASM_DMAENGINE_H #define ASM_DMAENGINE_H +#include +#include + #include #define SH_DMAC_MAX_CHANNELS 6 @@ -70,4 +73,21 @@ struct sh_dmae_slave { struct sh_dmae_slave_config *config; /* Set by the driver */ }; +struct sh_dmae_regs { + u32 sar; /* SAR / source address */ + u32 dar; /* DAR / destination address */ + u32 tcr; /* TCR / transfer count */ +}; + +struct sh_desc { + struct sh_dmae_regs hw; + struct list_head node; + struct dma_async_tx_descriptor async_tx; + enum dma_data_direction direction; + dma_cookie_t cookie; + size_t partial; + int chunks; + int mark; +}; + #endif diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c index ea6779f3e73f..5d17e09cb625 100644 --- a/drivers/dma/shdma.c +++ b/drivers/dma/shdma.c @@ -587,6 +587,19 @@ static void sh_dmae_terminate_all(struct dma_chan *chan) if (!chan) return; + dmae_halt(sh_chan); + + spin_lock_bh(&sh_chan->desc_lock); + if (!list_empty(&sh_chan->ld_queue)) { + /* Record partial transfer */ + struct sh_desc *desc = list_entry(sh_chan->ld_queue.next, + struct sh_desc, node); + desc->partial = (desc->hw.tcr - sh_dmae_readl(sh_chan, TCR)) << + sh_chan->xmit_shift; + + } + spin_unlock_bh(&sh_chan->desc_lock); + sh_dmae_chan_ld_cleanup(sh_chan, true); } @@ -701,6 +714,9 @@ static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan) /* Find the first not transferred desciptor */ list_for_each_entry(desc, &sh_chan->ld_queue, node) if (desc->mark == DESC_SUBMITTED) { + dev_dbg(sh_chan->dev, "Queue #%d to %d: %u@%x -> %x\n", + desc->async_tx.cookie, sh_chan->id, + desc->hw.tcr, desc->hw.sar, desc->hw.dar); /* Get the ld start address from ld_queue */ dmae_set_reg(sh_chan, &desc->hw); dmae_start(sh_chan); diff --git a/drivers/dma/shdma.h b/drivers/dma/shdma.h index 9f0897f7fe34..153609a1e96c 100644 --- a/drivers/dma/shdma.h +++ b/drivers/dma/shdma.h @@ -21,22 +21,6 @@ #define SH_DMA_TCR_MAX 0x00FFFFFF /* 16MB */ -struct sh_dmae_regs { - u32 sar; /* SAR / source address */ - u32 dar; /* DAR / destination address */ - u32 tcr; /* TCR / transfer count */ -}; - -struct sh_desc { - struct sh_dmae_regs hw; - struct list_head node; - struct dma_async_tx_descriptor async_tx; - enum dma_data_direction direction; - dma_cookie_t cookie; - int chunks; - int mark; -}; - struct device; struct sh_dmae_chan { -- 2.20.1