From 199244d69458770770890f8b5988a1b6cad701ad Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Tue, 17 Jan 2017 13:57:31 +0200 Subject: [PATCH] dmaengine: dw: add support of iDMA 32-bit hardware iDMA 32-bit is Intel designed DMA controller that behaves like Synopsys Designware DMA. This patch adds a support of the new Intel hardware. Due to iDMA 32-bit has no autoconfiguration the platform code must provide a platform data to dw_dma_probe(). By default full FIFO (1024 bytes) is assigned to channel 0. Here we slice FIFO on equal parts between channels for iDMA 32-bit case. Signed-off-by: Andy Shevchenko Signed-off-by: Vinod Koul --- drivers/dma/dw/core.c | 101 ++++++++++++++++++++++++--- include/linux/platform_data/dma-dw.h | 2 + 2 files changed, 94 insertions(+), 9 deletions(-) diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c index 0186d6732294..e500950dad82 100644 --- a/drivers/dma/dw/core.c +++ b/drivers/dma/dw/core.c @@ -138,16 +138,32 @@ static void dwc_desc_put(struct dw_dma_chan *dwc, struct dw_desc *desc) dwc->descs_allocated--; } -static void dwc_initialize(struct dw_dma_chan *dwc) +static void dwc_initialize_chan_idma32(struct dw_dma_chan *dwc) +{ + u32 cfghi = 0; + u32 cfglo = 0; + + /* Set default burst alignment */ + cfglo |= IDMA32C_CFGL_DST_BURST_ALIGN | IDMA32C_CFGL_SRC_BURST_ALIGN; + + /* Low 4 bits of the request lines */ + cfghi |= IDMA32C_CFGH_DST_PER(dwc->dws.dst_id & 0xf); + cfghi |= IDMA32C_CFGH_SRC_PER(dwc->dws.src_id & 0xf); + + /* Request line extension (2 bits) */ + cfghi |= IDMA32C_CFGH_DST_PER_EXT(dwc->dws.dst_id >> 4 & 0x3); + cfghi |= IDMA32C_CFGH_SRC_PER_EXT(dwc->dws.src_id >> 4 & 0x3); + + channel_writel(dwc, CFG_LO, cfglo); + channel_writel(dwc, CFG_HI, cfghi); +} + +static void dwc_initialize_chan_dw(struct dw_dma_chan *dwc) { - struct dw_dma *dw = to_dw_dma(dwc->chan.device); u32 cfghi = DWC_CFGH_FIFO_MODE; u32 cfglo = DWC_CFGL_CH_PRIOR(dwc->priority); bool hs_polarity = dwc->dws.hs_polarity; - if (test_bit(DW_DMA_IS_INITIALIZED, &dwc->flags)) - return; - cfghi |= DWC_CFGH_DST_PER(dwc->dws.dst_id); cfghi |= DWC_CFGH_SRC_PER(dwc->dws.src_id); @@ -156,6 +172,19 @@ static void dwc_initialize(struct dw_dma_chan *dwc) channel_writel(dwc, CFG_LO, cfglo); channel_writel(dwc, CFG_HI, cfghi); +} + +static void dwc_initialize(struct dw_dma_chan *dwc) +{ + struct dw_dma *dw = to_dw_dma(dwc->chan.device); + + if (test_bit(DW_DMA_IS_INITIALIZED, &dwc->flags)) + return; + + if (dw->pdata->is_idma32) + dwc_initialize_chan_idma32(dwc); + else + dwc_initialize_chan_dw(dwc); /* Enable interrupts */ channel_set_bit(dw, MASK.XFER, dwc->mask); @@ -187,8 +216,13 @@ static inline void dwc_chan_disable(struct dw_dma *dw, struct dw_dma_chan *dwc) static u32 bytes2block(struct dw_dma_chan *dwc, size_t bytes, unsigned int width, size_t *len) { + struct dw_dma *dw = to_dw_dma(dwc->chan.device); u32 block; + /* Always in bytes for iDMA 32-bit */ + if (dw->pdata->is_idma32) + width = 0; + if ((bytes >> width) > dwc->block_size) { block = dwc->block_size; *len = block << width; @@ -202,6 +236,11 @@ static u32 bytes2block(struct dw_dma_chan *dwc, size_t bytes, static size_t block2bytes(struct dw_dma_chan *dwc, u32 block, u32 width) { + struct dw_dma *dw = to_dw_dma(dwc->chan.device); + + if (dw->pdata->is_idma32) + return IDMA32C_CTLH_BLOCK_TS(block); + return DWC_CTLH_BLOCK_TS(block) << width; } @@ -915,14 +954,16 @@ static int dwc_config(struct dma_chan *chan, struct dma_slave_config *sconfig) { struct dw_dma_chan *dwc = to_dw_dma_chan(chan); struct dma_slave_config *sc = &dwc->dma_sconfig; + struct dw_dma *dw = to_dw_dma(chan->device); /* * Fix sconfig's burst size according to dw_dmac. We need to convert * them as: * 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3. * * NOTE: burst size 2 is not supported by DesignWare controller. + * iDMA 32-bit supports it. */ - u32 s = 2; + u32 s = dw->pdata->is_idma32 ? 1 : 2; /* Check if chan will be configured for slave transfers */ if (!is_slave_direction(sconfig->direction)) @@ -937,12 +978,19 @@ static int dwc_config(struct dma_chan *chan, struct dma_slave_config *sconfig) return 0; } -static void dwc_chan_pause(struct dw_dma_chan *dwc) +static void dwc_chan_pause(struct dw_dma_chan *dwc, bool drain) { + struct dw_dma *dw = to_dw_dma(dwc->chan.device); unsigned int count = 20; /* timeout iterations */ u32 cfglo; cfglo = channel_readl(dwc, CFG_LO); + if (dw->pdata->is_idma32) { + if (drain) + cfglo |= IDMA32C_CFGL_CH_DRAIN; + else + cfglo &= ~IDMA32C_CFGL_CH_DRAIN; + } channel_writel(dwc, CFG_LO, cfglo | DWC_CFGL_CH_SUSP); while (!(channel_readl(dwc, CFG_LO) & DWC_CFGL_FIFO_EMPTY) && count--) udelay(2); @@ -956,7 +1004,7 @@ static int dwc_pause(struct dma_chan *chan) unsigned long flags; spin_lock_irqsave(&dwc->lock, flags); - dwc_chan_pause(dwc); + dwc_chan_pause(dwc, false); spin_unlock_irqrestore(&dwc->lock, flags); return 0; @@ -998,6 +1046,8 @@ static int dwc_terminate_all(struct dma_chan *chan) clear_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags); + dwc_chan_pause(dwc, true); + dwc_chan_disable(dw, dwc); dwc_chan_resume(dwc); @@ -1090,6 +1140,32 @@ static void dwc_issue_pending(struct dma_chan *chan) /*----------------------------------------------------------------------*/ +/* + * Program FIFO size of channels. + * + * By default full FIFO (1024 bytes) is assigned to channel 0. Here we + * slice FIFO on equal parts between channels. + */ +static void idma32_fifo_partition(struct dw_dma *dw) +{ + u64 value = IDMA32C_FP_PSIZE_CH0(128) | IDMA32C_FP_PSIZE_CH1(128) | + IDMA32C_FP_UPDATE; + u64 fifo_partition = 0; + + if (!dw->pdata->is_idma32) + return; + + /* Fill FIFO_PARTITION low bits (Channels 0..1, 4..5) */ + fifo_partition |= value << 0; + + /* Fill FIFO_PARTITION high bits (Channels 2..3, 6..7) */ + fifo_partition |= value << 32; + + /* Program FIFO Partition registers - 128 bytes for each channel */ + idma32_writeq(dw, FIFO_PARTITION1, fifo_partition); + idma32_writeq(dw, FIFO_PARTITION0, fifo_partition); +} + static void dw_dma_off(struct dw_dma *dw) { unsigned int i; @@ -1509,8 +1585,13 @@ int dw_dma_probe(struct dw_dma_chip *chip) /* Force dma off, just in case */ dw_dma_off(dw); + idma32_fifo_partition(dw); + /* Device and instance ID for IRQ and DMA pool */ - snprintf(dw->name, sizeof(dw->name), "dw:dmac%d", chip->id); + if (pdata->is_idma32) + snprintf(dw->name, sizeof(dw->name), "idma32:dmac%d", chip->id); + else + snprintf(dw->name, sizeof(dw->name), "dw:dmac%d", chip->id); /* Create a pool of consistent memory blocks for hardware descriptors */ dw->desc_pool = dmam_pool_create(dw->name, chip->dev, @@ -1673,6 +1754,8 @@ int dw_dma_enable(struct dw_dma_chip *chip) { struct dw_dma *dw = chip->dw; + idma32_fifo_partition(dw); + dw_dma_on(dw); return 0; } diff --git a/include/linux/platform_data/dma-dw.h b/include/linux/platform_data/dma-dw.h index e69e415d0d98..896cb71a382c 100644 --- a/include/linux/platform_data/dma-dw.h +++ b/include/linux/platform_data/dma-dw.h @@ -41,6 +41,7 @@ struct dw_dma_slave { * @is_private: The device channels should be marked as private and not for * by the general purpose DMA channel allocator. * @is_memcpy: The device channels do support memory-to-memory transfers. + * @is_idma32: The type of the DMA controller is iDMA32 * @chan_allocation_order: Allocate channels starting from 0 or 7 * @chan_priority: Set channel priority increasing from 0 to 7 or 7 to 0. * @block_size: Maximum block size supported by the controller @@ -53,6 +54,7 @@ struct dw_dma_platform_data { unsigned int nr_channels; bool is_private; bool is_memcpy; + bool is_idma32; #define CHAN_ALLOCATION_ASCENDING 0 /* zero to seven */ #define CHAN_ALLOCATION_DESCENDING 1 /* seven to zero */ unsigned char chan_allocation_order; -- 2.20.1