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![Colin Ian King](/assets/img/avatar_default.png)
The pointer desc is being null checked twice, the second null check
is redundant because desc has not been re-assigned between the
checks. Remove the redundant second null check on desc.
Fixes: ef6fb2d6f1
("dmaengine: dw-axi-dmac: simplify descriptor management")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Tested-by: Sia Jee Heng <jee.heng.sia@intel.com>
Reviewed-by: Sia Jee Heng <jee.heng.sia@intel.com>
Addresses-Coverity: ("Logically dead code")
Link: https://lore.kernel.org/r/20210203134652.22618-1-colin.king@canonical.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
1515 lines
38 KiB
C
1515 lines
38 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// (C) 2017-2018 Synopsys, Inc. (www.synopsys.com)
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/*
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* Synopsys DesignWare AXI DMA Controller driver.
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*
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* Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
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*/
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#include <linux/bitops.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/dmaengine.h>
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#include <linux/dmapool.h>
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#include <linux/dma-mapping.h>
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/iopoll.h>
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#include <linux/io-64-nonatomic-lo-hi.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_dma.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/property.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include "dw-axi-dmac.h"
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#include "../dmaengine.h"
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#include "../virt-dma.h"
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/*
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* The set of bus widths supported by the DMA controller. DW AXI DMAC supports
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* master data bus width up to 512 bits (for both AXI master interfaces), but
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* it depends on IP block configurarion.
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*/
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#define AXI_DMA_BUSWIDTHS \
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(DMA_SLAVE_BUSWIDTH_1_BYTE | \
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DMA_SLAVE_BUSWIDTH_2_BYTES | \
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DMA_SLAVE_BUSWIDTH_4_BYTES | \
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DMA_SLAVE_BUSWIDTH_8_BYTES | \
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DMA_SLAVE_BUSWIDTH_16_BYTES | \
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DMA_SLAVE_BUSWIDTH_32_BYTES | \
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DMA_SLAVE_BUSWIDTH_64_BYTES)
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static inline void
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axi_dma_iowrite32(struct axi_dma_chip *chip, u32 reg, u32 val)
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{
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iowrite32(val, chip->regs + reg);
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}
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static inline u32 axi_dma_ioread32(struct axi_dma_chip *chip, u32 reg)
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{
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return ioread32(chip->regs + reg);
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}
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static inline void
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axi_chan_iowrite32(struct axi_dma_chan *chan, u32 reg, u32 val)
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{
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iowrite32(val, chan->chan_regs + reg);
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}
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static inline u32 axi_chan_ioread32(struct axi_dma_chan *chan, u32 reg)
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{
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return ioread32(chan->chan_regs + reg);
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}
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static inline void
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axi_chan_iowrite64(struct axi_dma_chan *chan, u32 reg, u64 val)
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{
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/*
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* We split one 64 bit write for two 32 bit write as some HW doesn't
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* support 64 bit access.
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*/
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iowrite32(lower_32_bits(val), chan->chan_regs + reg);
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iowrite32(upper_32_bits(val), chan->chan_regs + reg + 4);
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}
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static inline void axi_dma_disable(struct axi_dma_chip *chip)
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{
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u32 val;
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val = axi_dma_ioread32(chip, DMAC_CFG);
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val &= ~DMAC_EN_MASK;
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axi_dma_iowrite32(chip, DMAC_CFG, val);
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}
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static inline void axi_dma_enable(struct axi_dma_chip *chip)
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{
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u32 val;
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val = axi_dma_ioread32(chip, DMAC_CFG);
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val |= DMAC_EN_MASK;
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axi_dma_iowrite32(chip, DMAC_CFG, val);
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}
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static inline void axi_dma_irq_disable(struct axi_dma_chip *chip)
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{
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u32 val;
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val = axi_dma_ioread32(chip, DMAC_CFG);
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val &= ~INT_EN_MASK;
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axi_dma_iowrite32(chip, DMAC_CFG, val);
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}
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static inline void axi_dma_irq_enable(struct axi_dma_chip *chip)
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{
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u32 val;
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val = axi_dma_ioread32(chip, DMAC_CFG);
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val |= INT_EN_MASK;
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axi_dma_iowrite32(chip, DMAC_CFG, val);
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}
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static inline void axi_chan_irq_disable(struct axi_dma_chan *chan, u32 irq_mask)
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{
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u32 val;
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if (likely(irq_mask == DWAXIDMAC_IRQ_ALL)) {
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axi_chan_iowrite32(chan, CH_INTSTATUS_ENA, DWAXIDMAC_IRQ_NONE);
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} else {
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val = axi_chan_ioread32(chan, CH_INTSTATUS_ENA);
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val &= ~irq_mask;
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axi_chan_iowrite32(chan, CH_INTSTATUS_ENA, val);
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}
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}
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static inline void axi_chan_irq_set(struct axi_dma_chan *chan, u32 irq_mask)
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{
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axi_chan_iowrite32(chan, CH_INTSTATUS_ENA, irq_mask);
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}
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static inline void axi_chan_irq_sig_set(struct axi_dma_chan *chan, u32 irq_mask)
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{
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axi_chan_iowrite32(chan, CH_INTSIGNAL_ENA, irq_mask);
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}
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static inline void axi_chan_irq_clear(struct axi_dma_chan *chan, u32 irq_mask)
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{
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axi_chan_iowrite32(chan, CH_INTCLEAR, irq_mask);
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}
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static inline u32 axi_chan_irq_read(struct axi_dma_chan *chan)
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{
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return axi_chan_ioread32(chan, CH_INTSTATUS);
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}
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static inline void axi_chan_disable(struct axi_dma_chan *chan)
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{
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u32 val;
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val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
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val &= ~(BIT(chan->id) << DMAC_CHAN_EN_SHIFT);
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val |= BIT(chan->id) << DMAC_CHAN_EN_WE_SHIFT;
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axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
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}
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static inline void axi_chan_enable(struct axi_dma_chan *chan)
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{
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u32 val;
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val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
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val |= BIT(chan->id) << DMAC_CHAN_EN_SHIFT |
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BIT(chan->id) << DMAC_CHAN_EN_WE_SHIFT;
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axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
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}
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static inline bool axi_chan_is_hw_enable(struct axi_dma_chan *chan)
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{
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u32 val;
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val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
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return !!(val & (BIT(chan->id) << DMAC_CHAN_EN_SHIFT));
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}
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static void axi_dma_hw_init(struct axi_dma_chip *chip)
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{
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u32 i;
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for (i = 0; i < chip->dw->hdata->nr_channels; i++) {
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axi_chan_irq_disable(&chip->dw->chan[i], DWAXIDMAC_IRQ_ALL);
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axi_chan_disable(&chip->dw->chan[i]);
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}
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}
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static u32 axi_chan_get_xfer_width(struct axi_dma_chan *chan, dma_addr_t src,
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dma_addr_t dst, size_t len)
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{
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u32 max_width = chan->chip->dw->hdata->m_data_width;
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return __ffs(src | dst | len | BIT(max_width));
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}
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static inline const char *axi_chan_name(struct axi_dma_chan *chan)
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{
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return dma_chan_name(&chan->vc.chan);
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}
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static struct axi_dma_desc *axi_desc_alloc(u32 num)
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{
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struct axi_dma_desc *desc;
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desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
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if (!desc)
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return NULL;
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desc->hw_desc = kcalloc(num, sizeof(*desc->hw_desc), GFP_NOWAIT);
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if (!desc->hw_desc) {
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kfree(desc);
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return NULL;
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}
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return desc;
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}
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static struct axi_dma_lli *axi_desc_get(struct axi_dma_chan *chan,
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dma_addr_t *addr)
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{
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struct axi_dma_lli *lli;
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dma_addr_t phys;
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lli = dma_pool_zalloc(chan->desc_pool, GFP_NOWAIT, &phys);
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if (unlikely(!lli)) {
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dev_err(chan2dev(chan), "%s: not enough descriptors available\n",
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axi_chan_name(chan));
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return NULL;
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}
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atomic_inc(&chan->descs_allocated);
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*addr = phys;
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return lli;
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}
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static void axi_desc_put(struct axi_dma_desc *desc)
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{
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struct axi_dma_chan *chan = desc->chan;
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int count = atomic_read(&chan->descs_allocated);
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struct axi_dma_hw_desc *hw_desc;
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int descs_put;
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for (descs_put = 0; descs_put < count; descs_put++) {
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hw_desc = &desc->hw_desc[descs_put];
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dma_pool_free(chan->desc_pool, hw_desc->lli, hw_desc->llp);
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}
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kfree(desc->hw_desc);
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kfree(desc);
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atomic_sub(descs_put, &chan->descs_allocated);
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dev_vdbg(chan2dev(chan), "%s: %d descs put, %d still allocated\n",
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axi_chan_name(chan), descs_put,
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atomic_read(&chan->descs_allocated));
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}
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static void vchan_desc_put(struct virt_dma_desc *vdesc)
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{
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axi_desc_put(vd_to_axi_desc(vdesc));
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}
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static enum dma_status
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dma_chan_tx_status(struct dma_chan *dchan, dma_cookie_t cookie,
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struct dma_tx_state *txstate)
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{
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struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
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struct virt_dma_desc *vdesc;
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enum dma_status status;
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u32 completed_length;
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unsigned long flags;
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u32 completed_blocks;
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size_t bytes = 0;
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u32 length;
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u32 len;
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status = dma_cookie_status(dchan, cookie, txstate);
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if (status == DMA_COMPLETE || !txstate)
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return status;
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spin_lock_irqsave(&chan->vc.lock, flags);
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vdesc = vchan_find_desc(&chan->vc, cookie);
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if (vdesc) {
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length = vd_to_axi_desc(vdesc)->length;
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completed_blocks = vd_to_axi_desc(vdesc)->completed_blocks;
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len = vd_to_axi_desc(vdesc)->hw_desc[0].len;
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completed_length = completed_blocks * len;
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bytes = length - completed_length;
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} else {
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bytes = vd_to_axi_desc(vdesc)->length;
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}
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spin_unlock_irqrestore(&chan->vc.lock, flags);
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dma_set_residue(txstate, bytes);
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return status;
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}
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static void write_desc_llp(struct axi_dma_hw_desc *desc, dma_addr_t adr)
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{
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desc->lli->llp = cpu_to_le64(adr);
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}
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static void write_chan_llp(struct axi_dma_chan *chan, dma_addr_t adr)
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{
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axi_chan_iowrite64(chan, CH_LLP, adr);
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}
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static void dw_axi_dma_set_byte_halfword(struct axi_dma_chan *chan, bool set)
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{
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u32 offset = DMAC_APB_BYTE_WR_CH_EN;
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u32 reg_width, val;
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if (!chan->chip->apb_regs) {
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dev_dbg(chan->chip->dev, "apb_regs not initialized\n");
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return;
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}
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reg_width = __ffs(chan->config.dst_addr_width);
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if (reg_width == DWAXIDMAC_TRANS_WIDTH_16)
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offset = DMAC_APB_HALFWORD_WR_CH_EN;
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val = ioread32(chan->chip->apb_regs + offset);
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if (set)
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val |= BIT(chan->id);
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else
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val &= ~BIT(chan->id);
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iowrite32(val, chan->chip->apb_regs + offset);
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}
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/* Called in chan locked context */
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static void axi_chan_block_xfer_start(struct axi_dma_chan *chan,
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struct axi_dma_desc *first)
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{
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u32 priority = chan->chip->dw->hdata->priority[chan->id];
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u32 reg, irq_mask;
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u8 lms = 0; /* Select AXI0 master for LLI fetching */
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if (unlikely(axi_chan_is_hw_enable(chan))) {
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dev_err(chan2dev(chan), "%s is non-idle!\n",
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axi_chan_name(chan));
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return;
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}
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axi_dma_enable(chan->chip);
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reg = (DWAXIDMAC_MBLK_TYPE_LL << CH_CFG_L_DST_MULTBLK_TYPE_POS |
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DWAXIDMAC_MBLK_TYPE_LL << CH_CFG_L_SRC_MULTBLK_TYPE_POS);
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axi_chan_iowrite32(chan, CH_CFG_L, reg);
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reg = (DWAXIDMAC_TT_FC_MEM_TO_MEM_DMAC << CH_CFG_H_TT_FC_POS |
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priority << CH_CFG_H_PRIORITY_POS |
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DWAXIDMAC_HS_SEL_HW << CH_CFG_H_HS_SEL_DST_POS |
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DWAXIDMAC_HS_SEL_HW << CH_CFG_H_HS_SEL_SRC_POS);
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switch (chan->direction) {
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case DMA_MEM_TO_DEV:
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dw_axi_dma_set_byte_halfword(chan, true);
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reg |= (chan->config.device_fc ?
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DWAXIDMAC_TT_FC_MEM_TO_PER_DST :
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DWAXIDMAC_TT_FC_MEM_TO_PER_DMAC)
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<< CH_CFG_H_TT_FC_POS;
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break;
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case DMA_DEV_TO_MEM:
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reg |= (chan->config.device_fc ?
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DWAXIDMAC_TT_FC_PER_TO_MEM_SRC :
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DWAXIDMAC_TT_FC_PER_TO_MEM_DMAC)
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<< CH_CFG_H_TT_FC_POS;
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break;
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default:
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break;
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}
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axi_chan_iowrite32(chan, CH_CFG_H, reg);
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write_chan_llp(chan, first->hw_desc[0].llp | lms);
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irq_mask = DWAXIDMAC_IRQ_DMA_TRF | DWAXIDMAC_IRQ_ALL_ERR;
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axi_chan_irq_sig_set(chan, irq_mask);
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/* Generate 'suspend' status but don't generate interrupt */
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irq_mask |= DWAXIDMAC_IRQ_SUSPENDED;
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axi_chan_irq_set(chan, irq_mask);
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axi_chan_enable(chan);
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}
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static void axi_chan_start_first_queued(struct axi_dma_chan *chan)
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{
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struct axi_dma_desc *desc;
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struct virt_dma_desc *vd;
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vd = vchan_next_desc(&chan->vc);
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if (!vd)
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return;
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desc = vd_to_axi_desc(vd);
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dev_vdbg(chan2dev(chan), "%s: started %u\n", axi_chan_name(chan),
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vd->tx.cookie);
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axi_chan_block_xfer_start(chan, desc);
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}
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static void dma_chan_issue_pending(struct dma_chan *dchan)
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{
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struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
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unsigned long flags;
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spin_lock_irqsave(&chan->vc.lock, flags);
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if (vchan_issue_pending(&chan->vc))
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axi_chan_start_first_queued(chan);
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spin_unlock_irqrestore(&chan->vc.lock, flags);
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}
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static void dw_axi_dma_synchronize(struct dma_chan *dchan)
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{
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struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
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vchan_synchronize(&chan->vc);
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}
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static int dma_chan_alloc_chan_resources(struct dma_chan *dchan)
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{
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struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
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/* ASSERT: channel is idle */
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if (axi_chan_is_hw_enable(chan)) {
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dev_err(chan2dev(chan), "%s is non-idle!\n",
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axi_chan_name(chan));
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return -EBUSY;
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}
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/* LLI address must be aligned to a 64-byte boundary */
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chan->desc_pool = dma_pool_create(dev_name(chan2dev(chan)),
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chan->chip->dev,
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sizeof(struct axi_dma_lli),
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64, 0);
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if (!chan->desc_pool) {
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dev_err(chan2dev(chan), "No memory for descriptors\n");
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return -ENOMEM;
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}
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dev_vdbg(dchan2dev(dchan), "%s: allocating\n", axi_chan_name(chan));
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pm_runtime_get(chan->chip->dev);
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return 0;
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}
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static void dma_chan_free_chan_resources(struct dma_chan *dchan)
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{
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struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
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/* ASSERT: channel is idle */
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if (axi_chan_is_hw_enable(chan))
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dev_err(dchan2dev(dchan), "%s is non-idle!\n",
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axi_chan_name(chan));
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axi_chan_disable(chan);
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axi_chan_irq_disable(chan, DWAXIDMAC_IRQ_ALL);
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vchan_free_chan_resources(&chan->vc);
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dma_pool_destroy(chan->desc_pool);
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chan->desc_pool = NULL;
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|
dev_vdbg(dchan2dev(dchan),
|
|
"%s: free resources, descriptor still allocated: %u\n",
|
|
axi_chan_name(chan), atomic_read(&chan->descs_allocated));
|
|
|
|
pm_runtime_put(chan->chip->dev);
|
|
}
|
|
|
|
static void dw_axi_dma_set_hw_channel(struct axi_dma_chip *chip,
|
|
u32 handshake_num, bool set)
|
|
{
|
|
unsigned long start = 0;
|
|
unsigned long reg_value;
|
|
unsigned long reg_mask;
|
|
unsigned long reg_set;
|
|
unsigned long mask;
|
|
unsigned long val;
|
|
|
|
if (!chip->apb_regs) {
|
|
dev_dbg(chip->dev, "apb_regs not initialized\n");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* An unused DMA channel has a default value of 0x3F.
|
|
* Lock the DMA channel by assign a handshake number to the channel.
|
|
* Unlock the DMA channel by assign 0x3F to the channel.
|
|
*/
|
|
if (set) {
|
|
reg_set = UNUSED_CHANNEL;
|
|
val = handshake_num;
|
|
} else {
|
|
reg_set = handshake_num;
|
|
val = UNUSED_CHANNEL;
|
|
}
|
|
|
|
reg_value = lo_hi_readq(chip->apb_regs + DMAC_APB_HW_HS_SEL_0);
|
|
|
|
for_each_set_clump8(start, reg_mask, ®_value, 64) {
|
|
if (reg_mask == reg_set) {
|
|
mask = GENMASK_ULL(start + 7, start);
|
|
reg_value &= ~mask;
|
|
reg_value |= rol64(val, start);
|
|
lo_hi_writeq(reg_value,
|
|
chip->apb_regs + DMAC_APB_HW_HS_SEL_0);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If DW_axi_dmac sees CHx_CTL.ShadowReg_Or_LLI_Last bit of the fetched LLI
|
|
* as 1, it understands that the current block is the final block in the
|
|
* transfer and completes the DMA transfer operation at the end of current
|
|
* block transfer.
|
|
*/
|
|
static void set_desc_last(struct axi_dma_hw_desc *desc)
|
|
{
|
|
u32 val;
|
|
|
|
val = le32_to_cpu(desc->lli->ctl_hi);
|
|
val |= CH_CTL_H_LLI_LAST;
|
|
desc->lli->ctl_hi = cpu_to_le32(val);
|
|
}
|
|
|
|
static void write_desc_sar(struct axi_dma_hw_desc *desc, dma_addr_t adr)
|
|
{
|
|
desc->lli->sar = cpu_to_le64(adr);
|
|
}
|
|
|
|
static void write_desc_dar(struct axi_dma_hw_desc *desc, dma_addr_t adr)
|
|
{
|
|
desc->lli->dar = cpu_to_le64(adr);
|
|
}
|
|
|
|
static void set_desc_src_master(struct axi_dma_hw_desc *desc)
|
|
{
|
|
u32 val;
|
|
|
|
/* Select AXI0 for source master */
|
|
val = le32_to_cpu(desc->lli->ctl_lo);
|
|
val &= ~CH_CTL_L_SRC_MAST;
|
|
desc->lli->ctl_lo = cpu_to_le32(val);
|
|
}
|
|
|
|
static void set_desc_dest_master(struct axi_dma_hw_desc *hw_desc,
|
|
struct axi_dma_desc *desc)
|
|
{
|
|
u32 val;
|
|
|
|
/* Select AXI1 for source master if available */
|
|
val = le32_to_cpu(hw_desc->lli->ctl_lo);
|
|
if (desc->chan->chip->dw->hdata->nr_masters > 1)
|
|
val |= CH_CTL_L_DST_MAST;
|
|
else
|
|
val &= ~CH_CTL_L_DST_MAST;
|
|
|
|
hw_desc->lli->ctl_lo = cpu_to_le32(val);
|
|
}
|
|
|
|
static int dw_axi_dma_set_hw_desc(struct axi_dma_chan *chan,
|
|
struct axi_dma_hw_desc *hw_desc,
|
|
dma_addr_t mem_addr, size_t len)
|
|
{
|
|
unsigned int data_width = BIT(chan->chip->dw->hdata->m_data_width);
|
|
unsigned int reg_width;
|
|
unsigned int mem_width;
|
|
dma_addr_t device_addr;
|
|
size_t axi_block_ts;
|
|
size_t block_ts;
|
|
u32 ctllo, ctlhi;
|
|
u32 burst_len;
|
|
|
|
axi_block_ts = chan->chip->dw->hdata->block_size[chan->id];
|
|
|
|
mem_width = __ffs(data_width | mem_addr | len);
|
|
if (mem_width > DWAXIDMAC_TRANS_WIDTH_32)
|
|
mem_width = DWAXIDMAC_TRANS_WIDTH_32;
|
|
|
|
if (!IS_ALIGNED(mem_addr, 4)) {
|
|
dev_err(chan->chip->dev, "invalid buffer alignment\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch (chan->direction) {
|
|
case DMA_MEM_TO_DEV:
|
|
reg_width = __ffs(chan->config.dst_addr_width);
|
|
device_addr = chan->config.dst_addr;
|
|
ctllo = reg_width << CH_CTL_L_DST_WIDTH_POS |
|
|
mem_width << CH_CTL_L_SRC_WIDTH_POS |
|
|
DWAXIDMAC_CH_CTL_L_NOINC << CH_CTL_L_DST_INC_POS |
|
|
DWAXIDMAC_CH_CTL_L_INC << CH_CTL_L_SRC_INC_POS;
|
|
block_ts = len >> mem_width;
|
|
break;
|
|
case DMA_DEV_TO_MEM:
|
|
reg_width = __ffs(chan->config.src_addr_width);
|
|
device_addr = chan->config.src_addr;
|
|
ctllo = reg_width << CH_CTL_L_SRC_WIDTH_POS |
|
|
mem_width << CH_CTL_L_DST_WIDTH_POS |
|
|
DWAXIDMAC_CH_CTL_L_INC << CH_CTL_L_DST_INC_POS |
|
|
DWAXIDMAC_CH_CTL_L_NOINC << CH_CTL_L_SRC_INC_POS;
|
|
block_ts = len >> reg_width;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (block_ts > axi_block_ts)
|
|
return -EINVAL;
|
|
|
|
hw_desc->lli = axi_desc_get(chan, &hw_desc->llp);
|
|
if (unlikely(!hw_desc->lli))
|
|
return -ENOMEM;
|
|
|
|
ctlhi = CH_CTL_H_LLI_VALID;
|
|
|
|
if (chan->chip->dw->hdata->restrict_axi_burst_len) {
|
|
burst_len = chan->chip->dw->hdata->axi_rw_burst_len;
|
|
ctlhi |= CH_CTL_H_ARLEN_EN | CH_CTL_H_AWLEN_EN |
|
|
burst_len << CH_CTL_H_ARLEN_POS |
|
|
burst_len << CH_CTL_H_AWLEN_POS;
|
|
}
|
|
|
|
hw_desc->lli->ctl_hi = cpu_to_le32(ctlhi);
|
|
|
|
if (chan->direction == DMA_MEM_TO_DEV) {
|
|
write_desc_sar(hw_desc, mem_addr);
|
|
write_desc_dar(hw_desc, device_addr);
|
|
} else {
|
|
write_desc_sar(hw_desc, device_addr);
|
|
write_desc_dar(hw_desc, mem_addr);
|
|
}
|
|
|
|
hw_desc->lli->block_ts_lo = cpu_to_le32(block_ts - 1);
|
|
|
|
ctllo |= DWAXIDMAC_BURST_TRANS_LEN_4 << CH_CTL_L_DST_MSIZE_POS |
|
|
DWAXIDMAC_BURST_TRANS_LEN_4 << CH_CTL_L_SRC_MSIZE_POS;
|
|
hw_desc->lli->ctl_lo = cpu_to_le32(ctllo);
|
|
|
|
set_desc_src_master(hw_desc);
|
|
|
|
hw_desc->len = len;
|
|
return 0;
|
|
}
|
|
|
|
static size_t calculate_block_len(struct axi_dma_chan *chan,
|
|
dma_addr_t dma_addr, size_t buf_len,
|
|
enum dma_transfer_direction direction)
|
|
{
|
|
u32 data_width, reg_width, mem_width;
|
|
size_t axi_block_ts, block_len;
|
|
|
|
axi_block_ts = chan->chip->dw->hdata->block_size[chan->id];
|
|
|
|
switch (direction) {
|
|
case DMA_MEM_TO_DEV:
|
|
data_width = BIT(chan->chip->dw->hdata->m_data_width);
|
|
mem_width = __ffs(data_width | dma_addr | buf_len);
|
|
if (mem_width > DWAXIDMAC_TRANS_WIDTH_32)
|
|
mem_width = DWAXIDMAC_TRANS_WIDTH_32;
|
|
|
|
block_len = axi_block_ts << mem_width;
|
|
break;
|
|
case DMA_DEV_TO_MEM:
|
|
reg_width = __ffs(chan->config.src_addr_width);
|
|
block_len = axi_block_ts << reg_width;
|
|
break;
|
|
default:
|
|
block_len = 0;
|
|
}
|
|
|
|
return block_len;
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor *
|
|
dw_axi_dma_chan_prep_cyclic(struct dma_chan *dchan, dma_addr_t dma_addr,
|
|
size_t buf_len, size_t period_len,
|
|
enum dma_transfer_direction direction,
|
|
unsigned long flags)
|
|
{
|
|
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
|
|
struct axi_dma_hw_desc *hw_desc = NULL;
|
|
struct axi_dma_desc *desc = NULL;
|
|
dma_addr_t src_addr = dma_addr;
|
|
u32 num_periods, num_segments;
|
|
size_t axi_block_len;
|
|
u32 total_segments;
|
|
u32 segment_len;
|
|
unsigned int i;
|
|
int status;
|
|
u64 llp = 0;
|
|
u8 lms = 0; /* Select AXI0 master for LLI fetching */
|
|
|
|
num_periods = buf_len / period_len;
|
|
|
|
axi_block_len = calculate_block_len(chan, dma_addr, buf_len, direction);
|
|
if (axi_block_len == 0)
|
|
return NULL;
|
|
|
|
num_segments = DIV_ROUND_UP(period_len, axi_block_len);
|
|
segment_len = DIV_ROUND_UP(period_len, num_segments);
|
|
|
|
total_segments = num_periods * num_segments;
|
|
|
|
desc = axi_desc_alloc(total_segments);
|
|
if (unlikely(!desc))
|
|
goto err_desc_get;
|
|
|
|
chan->direction = direction;
|
|
desc->chan = chan;
|
|
chan->cyclic = true;
|
|
desc->length = 0;
|
|
desc->period_len = period_len;
|
|
|
|
for (i = 0; i < total_segments; i++) {
|
|
hw_desc = &desc->hw_desc[i];
|
|
|
|
status = dw_axi_dma_set_hw_desc(chan, hw_desc, src_addr,
|
|
segment_len);
|
|
if (status < 0)
|
|
goto err_desc_get;
|
|
|
|
desc->length += hw_desc->len;
|
|
/* Set end-of-link to the linked descriptor, so that cyclic
|
|
* callback function can be triggered during interrupt.
|
|
*/
|
|
set_desc_last(hw_desc);
|
|
|
|
src_addr += segment_len;
|
|
}
|
|
|
|
llp = desc->hw_desc[0].llp;
|
|
|
|
/* Managed transfer list */
|
|
do {
|
|
hw_desc = &desc->hw_desc[--total_segments];
|
|
write_desc_llp(hw_desc, llp | lms);
|
|
llp = hw_desc->llp;
|
|
} while (total_segments);
|
|
|
|
dw_axi_dma_set_hw_channel(chan->chip, chan->hw_handshake_num, true);
|
|
|
|
return vchan_tx_prep(&chan->vc, &desc->vd, flags);
|
|
|
|
err_desc_get:
|
|
if (desc)
|
|
axi_desc_put(desc);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor *
|
|
dw_axi_dma_chan_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
|
|
unsigned int sg_len,
|
|
enum dma_transfer_direction direction,
|
|
unsigned long flags, void *context)
|
|
{
|
|
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
|
|
struct axi_dma_hw_desc *hw_desc = NULL;
|
|
struct axi_dma_desc *desc = NULL;
|
|
u32 num_segments, segment_len;
|
|
unsigned int loop = 0;
|
|
struct scatterlist *sg;
|
|
size_t axi_block_len;
|
|
u32 len, num_sgs = 0;
|
|
unsigned int i;
|
|
dma_addr_t mem;
|
|
int status;
|
|
u64 llp = 0;
|
|
u8 lms = 0; /* Select AXI0 master for LLI fetching */
|
|
|
|
if (unlikely(!is_slave_direction(direction) || !sg_len))
|
|
return NULL;
|
|
|
|
mem = sg_dma_address(sgl);
|
|
len = sg_dma_len(sgl);
|
|
|
|
axi_block_len = calculate_block_len(chan, mem, len, direction);
|
|
if (axi_block_len == 0)
|
|
return NULL;
|
|
|
|
for_each_sg(sgl, sg, sg_len, i)
|
|
num_sgs += DIV_ROUND_UP(sg_dma_len(sg), axi_block_len);
|
|
|
|
desc = axi_desc_alloc(num_sgs);
|
|
if (unlikely(!desc))
|
|
goto err_desc_get;
|
|
|
|
desc->chan = chan;
|
|
desc->length = 0;
|
|
chan->direction = direction;
|
|
|
|
for_each_sg(sgl, sg, sg_len, i) {
|
|
mem = sg_dma_address(sg);
|
|
len = sg_dma_len(sg);
|
|
num_segments = DIV_ROUND_UP(sg_dma_len(sg), axi_block_len);
|
|
segment_len = DIV_ROUND_UP(sg_dma_len(sg), num_segments);
|
|
|
|
do {
|
|
hw_desc = &desc->hw_desc[loop++];
|
|
status = dw_axi_dma_set_hw_desc(chan, hw_desc, mem, segment_len);
|
|
if (status < 0)
|
|
goto err_desc_get;
|
|
|
|
desc->length += hw_desc->len;
|
|
len -= segment_len;
|
|
mem += segment_len;
|
|
} while (len >= segment_len);
|
|
}
|
|
|
|
/* Set end-of-link to the last link descriptor of list */
|
|
set_desc_last(&desc->hw_desc[num_sgs - 1]);
|
|
|
|
/* Managed transfer list */
|
|
do {
|
|
hw_desc = &desc->hw_desc[--num_sgs];
|
|
write_desc_llp(hw_desc, llp | lms);
|
|
llp = hw_desc->llp;
|
|
} while (num_sgs);
|
|
|
|
dw_axi_dma_set_hw_channel(chan->chip, chan->hw_handshake_num, true);
|
|
|
|
return vchan_tx_prep(&chan->vc, &desc->vd, flags);
|
|
|
|
err_desc_get:
|
|
if (desc)
|
|
axi_desc_put(desc);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor *
|
|
dma_chan_prep_dma_memcpy(struct dma_chan *dchan, dma_addr_t dst_adr,
|
|
dma_addr_t src_adr, size_t len, unsigned long flags)
|
|
{
|
|
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
|
|
size_t block_ts, max_block_ts, xfer_len;
|
|
struct axi_dma_hw_desc *hw_desc = NULL;
|
|
struct axi_dma_desc *desc = NULL;
|
|
u32 xfer_width, reg, num;
|
|
u64 llp = 0;
|
|
u8 lms = 0; /* Select AXI0 master for LLI fetching */
|
|
|
|
dev_dbg(chan2dev(chan), "%s: memcpy: src: %pad dst: %pad length: %zd flags: %#lx",
|
|
axi_chan_name(chan), &src_adr, &dst_adr, len, flags);
|
|
|
|
max_block_ts = chan->chip->dw->hdata->block_size[chan->id];
|
|
xfer_width = axi_chan_get_xfer_width(chan, src_adr, dst_adr, len);
|
|
num = DIV_ROUND_UP(len, max_block_ts << xfer_width);
|
|
desc = axi_desc_alloc(num);
|
|
if (unlikely(!desc))
|
|
goto err_desc_get;
|
|
|
|
desc->chan = chan;
|
|
num = 0;
|
|
desc->length = 0;
|
|
while (len) {
|
|
xfer_len = len;
|
|
|
|
hw_desc = &desc->hw_desc[num];
|
|
/*
|
|
* Take care for the alignment.
|
|
* Actually source and destination widths can be different, but
|
|
* make them same to be simpler.
|
|
*/
|
|
xfer_width = axi_chan_get_xfer_width(chan, src_adr, dst_adr, xfer_len);
|
|
|
|
/*
|
|
* block_ts indicates the total number of data of width
|
|
* to be transferred in a DMA block transfer.
|
|
* BLOCK_TS register should be set to block_ts - 1
|
|
*/
|
|
block_ts = xfer_len >> xfer_width;
|
|
if (block_ts > max_block_ts) {
|
|
block_ts = max_block_ts;
|
|
xfer_len = max_block_ts << xfer_width;
|
|
}
|
|
|
|
hw_desc->lli = axi_desc_get(chan, &hw_desc->llp);
|
|
if (unlikely(!hw_desc->lli))
|
|
goto err_desc_get;
|
|
|
|
write_desc_sar(hw_desc, src_adr);
|
|
write_desc_dar(hw_desc, dst_adr);
|
|
hw_desc->lli->block_ts_lo = cpu_to_le32(block_ts - 1);
|
|
|
|
reg = CH_CTL_H_LLI_VALID;
|
|
if (chan->chip->dw->hdata->restrict_axi_burst_len) {
|
|
u32 burst_len = chan->chip->dw->hdata->axi_rw_burst_len;
|
|
|
|
reg |= (CH_CTL_H_ARLEN_EN |
|
|
burst_len << CH_CTL_H_ARLEN_POS |
|
|
CH_CTL_H_AWLEN_EN |
|
|
burst_len << CH_CTL_H_AWLEN_POS);
|
|
}
|
|
hw_desc->lli->ctl_hi = cpu_to_le32(reg);
|
|
|
|
reg = (DWAXIDMAC_BURST_TRANS_LEN_4 << CH_CTL_L_DST_MSIZE_POS |
|
|
DWAXIDMAC_BURST_TRANS_LEN_4 << CH_CTL_L_SRC_MSIZE_POS |
|
|
xfer_width << CH_CTL_L_DST_WIDTH_POS |
|
|
xfer_width << CH_CTL_L_SRC_WIDTH_POS |
|
|
DWAXIDMAC_CH_CTL_L_INC << CH_CTL_L_DST_INC_POS |
|
|
DWAXIDMAC_CH_CTL_L_INC << CH_CTL_L_SRC_INC_POS);
|
|
hw_desc->lli->ctl_lo = cpu_to_le32(reg);
|
|
|
|
set_desc_src_master(hw_desc);
|
|
set_desc_dest_master(hw_desc, desc);
|
|
|
|
hw_desc->len = xfer_len;
|
|
desc->length += hw_desc->len;
|
|
/* update the length and addresses for the next loop cycle */
|
|
len -= xfer_len;
|
|
dst_adr += xfer_len;
|
|
src_adr += xfer_len;
|
|
num++;
|
|
}
|
|
|
|
/* Set end-of-link to the last link descriptor of list */
|
|
set_desc_last(&desc->hw_desc[num - 1]);
|
|
/* Managed transfer list */
|
|
do {
|
|
hw_desc = &desc->hw_desc[--num];
|
|
write_desc_llp(hw_desc, llp | lms);
|
|
llp = hw_desc->llp;
|
|
} while (num);
|
|
|
|
return vchan_tx_prep(&chan->vc, &desc->vd, flags);
|
|
|
|
err_desc_get:
|
|
if (desc)
|
|
axi_desc_put(desc);
|
|
return NULL;
|
|
}
|
|
|
|
static int dw_axi_dma_chan_slave_config(struct dma_chan *dchan,
|
|
struct dma_slave_config *config)
|
|
{
|
|
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
|
|
|
|
memcpy(&chan->config, config, sizeof(*config));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void axi_chan_dump_lli(struct axi_dma_chan *chan,
|
|
struct axi_dma_hw_desc *desc)
|
|
{
|
|
dev_err(dchan2dev(&chan->vc.chan),
|
|
"SAR: 0x%llx DAR: 0x%llx LLP: 0x%llx BTS 0x%x CTL: 0x%x:%08x",
|
|
le64_to_cpu(desc->lli->sar),
|
|
le64_to_cpu(desc->lli->dar),
|
|
le64_to_cpu(desc->lli->llp),
|
|
le32_to_cpu(desc->lli->block_ts_lo),
|
|
le32_to_cpu(desc->lli->ctl_hi),
|
|
le32_to_cpu(desc->lli->ctl_lo));
|
|
}
|
|
|
|
static void axi_chan_list_dump_lli(struct axi_dma_chan *chan,
|
|
struct axi_dma_desc *desc_head)
|
|
{
|
|
int count = atomic_read(&chan->descs_allocated);
|
|
int i;
|
|
|
|
for (i = 0; i < count; i++)
|
|
axi_chan_dump_lli(chan, &desc_head->hw_desc[i]);
|
|
}
|
|
|
|
static noinline void axi_chan_handle_err(struct axi_dma_chan *chan, u32 status)
|
|
{
|
|
struct virt_dma_desc *vd;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&chan->vc.lock, flags);
|
|
|
|
axi_chan_disable(chan);
|
|
|
|
/* The bad descriptor currently is in the head of vc list */
|
|
vd = vchan_next_desc(&chan->vc);
|
|
/* Remove the completed descriptor from issued list */
|
|
list_del(&vd->node);
|
|
|
|
/* WARN about bad descriptor */
|
|
dev_err(chan2dev(chan),
|
|
"Bad descriptor submitted for %s, cookie: %d, irq: 0x%08x\n",
|
|
axi_chan_name(chan), vd->tx.cookie, status);
|
|
axi_chan_list_dump_lli(chan, vd_to_axi_desc(vd));
|
|
|
|
vchan_cookie_complete(vd);
|
|
|
|
/* Try to restart the controller */
|
|
axi_chan_start_first_queued(chan);
|
|
|
|
spin_unlock_irqrestore(&chan->vc.lock, flags);
|
|
}
|
|
|
|
static void axi_chan_block_xfer_complete(struct axi_dma_chan *chan)
|
|
{
|
|
int count = atomic_read(&chan->descs_allocated);
|
|
struct axi_dma_hw_desc *hw_desc;
|
|
struct axi_dma_desc *desc;
|
|
struct virt_dma_desc *vd;
|
|
unsigned long flags;
|
|
u64 llp;
|
|
int i;
|
|
|
|
spin_lock_irqsave(&chan->vc.lock, flags);
|
|
if (unlikely(axi_chan_is_hw_enable(chan))) {
|
|
dev_err(chan2dev(chan), "BUG: %s caught DWAXIDMAC_IRQ_DMA_TRF, but channel not idle!\n",
|
|
axi_chan_name(chan));
|
|
axi_chan_disable(chan);
|
|
}
|
|
|
|
/* The completed descriptor currently is in the head of vc list */
|
|
vd = vchan_next_desc(&chan->vc);
|
|
|
|
if (chan->cyclic) {
|
|
desc = vd_to_axi_desc(vd);
|
|
if (desc) {
|
|
llp = lo_hi_readq(chan->chan_regs + CH_LLP);
|
|
for (i = 0; i < count; i++) {
|
|
hw_desc = &desc->hw_desc[i];
|
|
if (hw_desc->llp == llp) {
|
|
axi_chan_irq_clear(chan, hw_desc->lli->status_lo);
|
|
hw_desc->lli->ctl_hi |= CH_CTL_H_LLI_VALID;
|
|
desc->completed_blocks = i;
|
|
|
|
if (((hw_desc->len * (i + 1)) % desc->period_len) == 0)
|
|
vchan_cyclic_callback(vd);
|
|
break;
|
|
}
|
|
}
|
|
|
|
axi_chan_enable(chan);
|
|
}
|
|
} else {
|
|
/* Remove the completed descriptor from issued list before completing */
|
|
list_del(&vd->node);
|
|
vchan_cookie_complete(vd);
|
|
|
|
/* Submit queued descriptors after processing the completed ones */
|
|
axi_chan_start_first_queued(chan);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&chan->vc.lock, flags);
|
|
}
|
|
|
|
static irqreturn_t dw_axi_dma_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct axi_dma_chip *chip = dev_id;
|
|
struct dw_axi_dma *dw = chip->dw;
|
|
struct axi_dma_chan *chan;
|
|
|
|
u32 status, i;
|
|
|
|
/* Disable DMAC inerrupts. We'll enable them after processing chanels */
|
|
axi_dma_irq_disable(chip);
|
|
|
|
/* Poll, clear and process every chanel interrupt status */
|
|
for (i = 0; i < dw->hdata->nr_channels; i++) {
|
|
chan = &dw->chan[i];
|
|
status = axi_chan_irq_read(chan);
|
|
axi_chan_irq_clear(chan, status);
|
|
|
|
dev_vdbg(chip->dev, "%s %u IRQ status: 0x%08x\n",
|
|
axi_chan_name(chan), i, status);
|
|
|
|
if (status & DWAXIDMAC_IRQ_ALL_ERR)
|
|
axi_chan_handle_err(chan, status);
|
|
else if (status & DWAXIDMAC_IRQ_DMA_TRF)
|
|
axi_chan_block_xfer_complete(chan);
|
|
}
|
|
|
|
/* Re-enable interrupts */
|
|
axi_dma_irq_enable(chip);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int dma_chan_terminate_all(struct dma_chan *dchan)
|
|
{
|
|
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
|
|
u32 chan_active = BIT(chan->id) << DMAC_CHAN_EN_SHIFT;
|
|
unsigned long flags;
|
|
u32 val;
|
|
int ret;
|
|
LIST_HEAD(head);
|
|
|
|
axi_chan_disable(chan);
|
|
|
|
ret = readl_poll_timeout_atomic(chan->chip->regs + DMAC_CHEN, val,
|
|
!(val & chan_active), 1000, 10000);
|
|
if (ret == -ETIMEDOUT)
|
|
dev_warn(dchan2dev(dchan),
|
|
"%s failed to stop\n", axi_chan_name(chan));
|
|
|
|
if (chan->direction != DMA_MEM_TO_MEM)
|
|
dw_axi_dma_set_hw_channel(chan->chip,
|
|
chan->hw_handshake_num, false);
|
|
if (chan->direction == DMA_MEM_TO_DEV)
|
|
dw_axi_dma_set_byte_halfword(chan, false);
|
|
|
|
spin_lock_irqsave(&chan->vc.lock, flags);
|
|
|
|
vchan_get_all_descriptors(&chan->vc, &head);
|
|
|
|
chan->cyclic = false;
|
|
spin_unlock_irqrestore(&chan->vc.lock, flags);
|
|
|
|
vchan_dma_desc_free_list(&chan->vc, &head);
|
|
|
|
dev_vdbg(dchan2dev(dchan), "terminated: %s\n", axi_chan_name(chan));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dma_chan_pause(struct dma_chan *dchan)
|
|
{
|
|
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
|
|
unsigned long flags;
|
|
unsigned int timeout = 20; /* timeout iterations */
|
|
u32 val;
|
|
|
|
spin_lock_irqsave(&chan->vc.lock, flags);
|
|
|
|
val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
|
|
val |= BIT(chan->id) << DMAC_CHAN_SUSP_SHIFT |
|
|
BIT(chan->id) << DMAC_CHAN_SUSP_WE_SHIFT;
|
|
axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
|
|
|
|
do {
|
|
if (axi_chan_irq_read(chan) & DWAXIDMAC_IRQ_SUSPENDED)
|
|
break;
|
|
|
|
udelay(2);
|
|
} while (--timeout);
|
|
|
|
axi_chan_irq_clear(chan, DWAXIDMAC_IRQ_SUSPENDED);
|
|
|
|
chan->is_paused = true;
|
|
|
|
spin_unlock_irqrestore(&chan->vc.lock, flags);
|
|
|
|
return timeout ? 0 : -EAGAIN;
|
|
}
|
|
|
|
/* Called in chan locked context */
|
|
static inline void axi_chan_resume(struct axi_dma_chan *chan)
|
|
{
|
|
u32 val;
|
|
|
|
val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
|
|
val &= ~(BIT(chan->id) << DMAC_CHAN_SUSP_SHIFT);
|
|
val |= (BIT(chan->id) << DMAC_CHAN_SUSP_WE_SHIFT);
|
|
axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
|
|
|
|
chan->is_paused = false;
|
|
}
|
|
|
|
static int dma_chan_resume(struct dma_chan *dchan)
|
|
{
|
|
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&chan->vc.lock, flags);
|
|
|
|
if (chan->is_paused)
|
|
axi_chan_resume(chan);
|
|
|
|
spin_unlock_irqrestore(&chan->vc.lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int axi_dma_suspend(struct axi_dma_chip *chip)
|
|
{
|
|
axi_dma_irq_disable(chip);
|
|
axi_dma_disable(chip);
|
|
|
|
clk_disable_unprepare(chip->core_clk);
|
|
clk_disable_unprepare(chip->cfgr_clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int axi_dma_resume(struct axi_dma_chip *chip)
|
|
{
|
|
int ret;
|
|
|
|
ret = clk_prepare_enable(chip->cfgr_clk);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = clk_prepare_enable(chip->core_clk);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
axi_dma_enable(chip);
|
|
axi_dma_irq_enable(chip);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused axi_dma_runtime_suspend(struct device *dev)
|
|
{
|
|
struct axi_dma_chip *chip = dev_get_drvdata(dev);
|
|
|
|
return axi_dma_suspend(chip);
|
|
}
|
|
|
|
static int __maybe_unused axi_dma_runtime_resume(struct device *dev)
|
|
{
|
|
struct axi_dma_chip *chip = dev_get_drvdata(dev);
|
|
|
|
return axi_dma_resume(chip);
|
|
}
|
|
|
|
static struct dma_chan *dw_axi_dma_of_xlate(struct of_phandle_args *dma_spec,
|
|
struct of_dma *ofdma)
|
|
{
|
|
struct dw_axi_dma *dw = ofdma->of_dma_data;
|
|
struct axi_dma_chan *chan;
|
|
struct dma_chan *dchan;
|
|
|
|
dchan = dma_get_any_slave_channel(&dw->dma);
|
|
if (!dchan)
|
|
return NULL;
|
|
|
|
chan = dchan_to_axi_dma_chan(dchan);
|
|
chan->hw_handshake_num = dma_spec->args[0];
|
|
return dchan;
|
|
}
|
|
|
|
static int parse_device_properties(struct axi_dma_chip *chip)
|
|
{
|
|
struct device *dev = chip->dev;
|
|
u32 tmp, carr[DMAC_MAX_CHANNELS];
|
|
int ret;
|
|
|
|
ret = device_property_read_u32(dev, "dma-channels", &tmp);
|
|
if (ret)
|
|
return ret;
|
|
if (tmp == 0 || tmp > DMAC_MAX_CHANNELS)
|
|
return -EINVAL;
|
|
|
|
chip->dw->hdata->nr_channels = tmp;
|
|
|
|
ret = device_property_read_u32(dev, "snps,dma-masters", &tmp);
|
|
if (ret)
|
|
return ret;
|
|
if (tmp == 0 || tmp > DMAC_MAX_MASTERS)
|
|
return -EINVAL;
|
|
|
|
chip->dw->hdata->nr_masters = tmp;
|
|
|
|
ret = device_property_read_u32(dev, "snps,data-width", &tmp);
|
|
if (ret)
|
|
return ret;
|
|
if (tmp > DWAXIDMAC_TRANS_WIDTH_MAX)
|
|
return -EINVAL;
|
|
|
|
chip->dw->hdata->m_data_width = tmp;
|
|
|
|
ret = device_property_read_u32_array(dev, "snps,block-size", carr,
|
|
chip->dw->hdata->nr_channels);
|
|
if (ret)
|
|
return ret;
|
|
for (tmp = 0; tmp < chip->dw->hdata->nr_channels; tmp++) {
|
|
if (carr[tmp] == 0 || carr[tmp] > DMAC_MAX_BLK_SIZE)
|
|
return -EINVAL;
|
|
|
|
chip->dw->hdata->block_size[tmp] = carr[tmp];
|
|
}
|
|
|
|
ret = device_property_read_u32_array(dev, "snps,priority", carr,
|
|
chip->dw->hdata->nr_channels);
|
|
if (ret)
|
|
return ret;
|
|
/* Priority value must be programmed within [0:nr_channels-1] range */
|
|
for (tmp = 0; tmp < chip->dw->hdata->nr_channels; tmp++) {
|
|
if (carr[tmp] >= chip->dw->hdata->nr_channels)
|
|
return -EINVAL;
|
|
|
|
chip->dw->hdata->priority[tmp] = carr[tmp];
|
|
}
|
|
|
|
/* axi-max-burst-len is optional property */
|
|
ret = device_property_read_u32(dev, "snps,axi-max-burst-len", &tmp);
|
|
if (!ret) {
|
|
if (tmp > DWAXIDMAC_ARWLEN_MAX + 1)
|
|
return -EINVAL;
|
|
if (tmp < DWAXIDMAC_ARWLEN_MIN + 1)
|
|
return -EINVAL;
|
|
|
|
chip->dw->hdata->restrict_axi_burst_len = true;
|
|
chip->dw->hdata->axi_rw_burst_len = tmp - 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dw_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *node = pdev->dev.of_node;
|
|
struct axi_dma_chip *chip;
|
|
struct resource *mem;
|
|
struct dw_axi_dma *dw;
|
|
struct dw_axi_dma_hcfg *hdata;
|
|
u32 i;
|
|
int ret;
|
|
|
|
chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
|
|
if (!chip)
|
|
return -ENOMEM;
|
|
|
|
dw = devm_kzalloc(&pdev->dev, sizeof(*dw), GFP_KERNEL);
|
|
if (!dw)
|
|
return -ENOMEM;
|
|
|
|
hdata = devm_kzalloc(&pdev->dev, sizeof(*hdata), GFP_KERNEL);
|
|
if (!hdata)
|
|
return -ENOMEM;
|
|
|
|
chip->dw = dw;
|
|
chip->dev = &pdev->dev;
|
|
chip->dw->hdata = hdata;
|
|
|
|
chip->irq = platform_get_irq(pdev, 0);
|
|
if (chip->irq < 0)
|
|
return chip->irq;
|
|
|
|
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
chip->regs = devm_ioremap_resource(chip->dev, mem);
|
|
if (IS_ERR(chip->regs))
|
|
return PTR_ERR(chip->regs);
|
|
|
|
if (of_device_is_compatible(node, "intel,kmb-axi-dma")) {
|
|
chip->apb_regs = devm_platform_ioremap_resource(pdev, 1);
|
|
if (IS_ERR(chip->apb_regs))
|
|
return PTR_ERR(chip->apb_regs);
|
|
}
|
|
|
|
chip->core_clk = devm_clk_get(chip->dev, "core-clk");
|
|
if (IS_ERR(chip->core_clk))
|
|
return PTR_ERR(chip->core_clk);
|
|
|
|
chip->cfgr_clk = devm_clk_get(chip->dev, "cfgr-clk");
|
|
if (IS_ERR(chip->cfgr_clk))
|
|
return PTR_ERR(chip->cfgr_clk);
|
|
|
|
ret = parse_device_properties(chip);
|
|
if (ret)
|
|
return ret;
|
|
|
|
dw->chan = devm_kcalloc(chip->dev, hdata->nr_channels,
|
|
sizeof(*dw->chan), GFP_KERNEL);
|
|
if (!dw->chan)
|
|
return -ENOMEM;
|
|
|
|
ret = devm_request_irq(chip->dev, chip->irq, dw_axi_dma_interrupt,
|
|
IRQF_SHARED, KBUILD_MODNAME, chip);
|
|
if (ret)
|
|
return ret;
|
|
|
|
|
|
INIT_LIST_HEAD(&dw->dma.channels);
|
|
for (i = 0; i < hdata->nr_channels; i++) {
|
|
struct axi_dma_chan *chan = &dw->chan[i];
|
|
|
|
chan->chip = chip;
|
|
chan->id = i;
|
|
chan->chan_regs = chip->regs + COMMON_REG_LEN + i * CHAN_REG_LEN;
|
|
atomic_set(&chan->descs_allocated, 0);
|
|
|
|
chan->vc.desc_free = vchan_desc_put;
|
|
vchan_init(&chan->vc, &dw->dma);
|
|
}
|
|
|
|
/* Set capabilities */
|
|
dma_cap_set(DMA_MEMCPY, dw->dma.cap_mask);
|
|
dma_cap_set(DMA_SLAVE, dw->dma.cap_mask);
|
|
dma_cap_set(DMA_CYCLIC, dw->dma.cap_mask);
|
|
|
|
/* DMA capabilities */
|
|
dw->dma.chancnt = hdata->nr_channels;
|
|
dw->dma.src_addr_widths = AXI_DMA_BUSWIDTHS;
|
|
dw->dma.dst_addr_widths = AXI_DMA_BUSWIDTHS;
|
|
dw->dma.directions = BIT(DMA_MEM_TO_MEM);
|
|
dw->dma.directions |= BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
|
|
dw->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
|
|
|
|
dw->dma.dev = chip->dev;
|
|
dw->dma.device_tx_status = dma_chan_tx_status;
|
|
dw->dma.device_issue_pending = dma_chan_issue_pending;
|
|
dw->dma.device_terminate_all = dma_chan_terminate_all;
|
|
dw->dma.device_pause = dma_chan_pause;
|
|
dw->dma.device_resume = dma_chan_resume;
|
|
|
|
dw->dma.device_alloc_chan_resources = dma_chan_alloc_chan_resources;
|
|
dw->dma.device_free_chan_resources = dma_chan_free_chan_resources;
|
|
|
|
dw->dma.device_prep_dma_memcpy = dma_chan_prep_dma_memcpy;
|
|
dw->dma.device_synchronize = dw_axi_dma_synchronize;
|
|
dw->dma.device_config = dw_axi_dma_chan_slave_config;
|
|
dw->dma.device_prep_slave_sg = dw_axi_dma_chan_prep_slave_sg;
|
|
dw->dma.device_prep_dma_cyclic = dw_axi_dma_chan_prep_cyclic;
|
|
|
|
/*
|
|
* Synopsis DesignWare AxiDMA datasheet mentioned Maximum
|
|
* supported blocks is 1024. Device register width is 4 bytes.
|
|
* Therefore, set constraint to 1024 * 4.
|
|
*/
|
|
dw->dma.dev->dma_parms = &dw->dma_parms;
|
|
dma_set_max_seg_size(&pdev->dev, MAX_BLOCK_SIZE);
|
|
platform_set_drvdata(pdev, chip);
|
|
|
|
pm_runtime_enable(chip->dev);
|
|
|
|
/*
|
|
* We can't just call pm_runtime_get here instead of
|
|
* pm_runtime_get_noresume + axi_dma_resume because we need
|
|
* driver to work also without Runtime PM.
|
|
*/
|
|
pm_runtime_get_noresume(chip->dev);
|
|
ret = axi_dma_resume(chip);
|
|
if (ret < 0)
|
|
goto err_pm_disable;
|
|
|
|
axi_dma_hw_init(chip);
|
|
|
|
pm_runtime_put(chip->dev);
|
|
|
|
ret = dmaenginem_async_device_register(&dw->dma);
|
|
if (ret)
|
|
goto err_pm_disable;
|
|
|
|
/* Register with OF helpers for DMA lookups */
|
|
ret = of_dma_controller_register(pdev->dev.of_node,
|
|
dw_axi_dma_of_xlate, dw);
|
|
if (ret < 0)
|
|
dev_warn(&pdev->dev,
|
|
"Failed to register OF DMA controller, fallback to MEM_TO_MEM mode\n");
|
|
|
|
dev_info(chip->dev, "DesignWare AXI DMA Controller, %d channels\n",
|
|
dw->hdata->nr_channels);
|
|
|
|
return 0;
|
|
|
|
err_pm_disable:
|
|
pm_runtime_disable(chip->dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int dw_remove(struct platform_device *pdev)
|
|
{
|
|
struct axi_dma_chip *chip = platform_get_drvdata(pdev);
|
|
struct dw_axi_dma *dw = chip->dw;
|
|
struct axi_dma_chan *chan, *_chan;
|
|
u32 i;
|
|
|
|
/* Enable clk before accessing to registers */
|
|
clk_prepare_enable(chip->cfgr_clk);
|
|
clk_prepare_enable(chip->core_clk);
|
|
axi_dma_irq_disable(chip);
|
|
for (i = 0; i < dw->hdata->nr_channels; i++) {
|
|
axi_chan_disable(&chip->dw->chan[i]);
|
|
axi_chan_irq_disable(&chip->dw->chan[i], DWAXIDMAC_IRQ_ALL);
|
|
}
|
|
axi_dma_disable(chip);
|
|
|
|
pm_runtime_disable(chip->dev);
|
|
axi_dma_suspend(chip);
|
|
|
|
devm_free_irq(chip->dev, chip->irq, chip);
|
|
|
|
of_dma_controller_free(chip->dev->of_node);
|
|
|
|
list_for_each_entry_safe(chan, _chan, &dw->dma.channels,
|
|
vc.chan.device_node) {
|
|
list_del(&chan->vc.chan.device_node);
|
|
tasklet_kill(&chan->vc.task);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops dw_axi_dma_pm_ops = {
|
|
SET_RUNTIME_PM_OPS(axi_dma_runtime_suspend, axi_dma_runtime_resume, NULL)
|
|
};
|
|
|
|
static const struct of_device_id dw_dma_of_id_table[] = {
|
|
{ .compatible = "snps,axi-dma-1.01a" },
|
|
{ .compatible = "intel,kmb-axi-dma" },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
|
|
|
|
static struct platform_driver dw_driver = {
|
|
.probe = dw_probe,
|
|
.remove = dw_remove,
|
|
.driver = {
|
|
.name = KBUILD_MODNAME,
|
|
.of_match_table = dw_dma_of_id_table,
|
|
.pm = &dw_axi_dma_pm_ops,
|
|
},
|
|
};
|
|
module_platform_driver(dw_driver);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("Synopsys DesignWare AXI DMA Controller platform driver");
|
|
MODULE_AUTHOR("Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>");
|