Hi Andy, On Fri, Feb 28, 2014 at 05:30:47PM +0000, Shevchenko, Andriy wrote: > On Fri, 2014-02-28 at 17:37 +0100, Maxime Ripard wrote: > > The Allwinner A31 has a 16 channels DMA controller that it shares with the > > newer A23. Although sharing some similarities with the DMA controller of the > > older Allwinner SoCs, it's significantly different, I don't expect it to be > > possible to share the driver for these two. > > > > The A31 Controller is able to memory-to-memory or memory-to-device transfers on > > the 16 channels in parallel. > > Thanks for update. > Few more small comments. > > > > > Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> > > --- > > .../devicetree/bindings/dma/sun6i-dma.txt | 45 + > > drivers/dma/Kconfig | 8 + > > drivers/dma/Makefile | 1 + > > drivers/dma/sun6i-dma.c | 959 +++++++++++++++++++++ > > 4 files changed, 1013 insertions(+) > > create mode 100644 Documentation/devicetree/bindings/dma/sun6i-dma.txt > > create mode 100644 drivers/dma/sun6i-dma.c > > > > diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt b/Documentation/devicetree/bindings/dma/sun6i-dma.txt > > new file mode 100644 > > index 0000000..5d7c86d > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt > > @@ -0,0 +1,45 @@ > > +Allwinner A31 DMA Controller > > + > > +This driver follows the generic DMA bindings defined in dma.txt. > > + > > +Required properties: > > + > > +- compatible: Must be "allwinner,sun6i-a31-dma" > > +- reg: Should contain the registers base address and length > > +- interrupts: Should contain a reference to the interrupt used by this device > > +- clocks: Should contain a reference to the parent AHB clock > > +- resets: Should contain a reference to the reset controller asserting > > + this device in reset > > +- #dma-cells : Should be 1, a single cell holding a line request number > > + > > +Example: > > + dma: dma-controller@01c02000 { > > + compatible = "allwinner,sun6i-a31-dma"; > > + reg = <0x01c02000 0x1000>; > > + interrupts = <0 50 4>; > > + clocks = <&ahb1_gates 6>; > > + resets = <&ahb1_rst 6>; > > + #dma-cells = <1>; > > + }; > > + > > +Clients: > > + > > +DMA clients connected to the A31 DMA controller must use the format > > +described in the dma.txt file, using a two-cell specifier for each > > +channel: a phandle plus one integer cells. > > +The two cells in order are: > > + > > +1. A phandle pointing to the DMA controller. > > +2. The port ID as specified in the datasheet > > + > > +Example: > > +spi2: spi@01c6a000 { > > + compatible = "allwinner,sun6i-a31-spi"; > > + reg = <0x01c6a000 0x1000>; > > + interrupts = <0 67 4>; > > + clocks = <&ahb1_gates 22>, <&spi2_clk>; > > + clock-names = "ahb", "mod"; > > + dmas = <&dma 25>, <&dma 25>; > > + dma-names = "rx", "tx"; > > + resets = <&ahb1_rst 22>; > > +}; > > diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig > > index 605b016..7923697 100644 > > --- a/drivers/dma/Kconfig > > +++ b/drivers/dma/Kconfig > > @@ -351,6 +351,14 @@ config MOXART_DMA > > help > > Enable support for the MOXA ART SoC DMA controller. > > > > +config DMA_SUN6I > > + tristate "Allwinner A31 SoCs DMA support" > > + depends on ARCH_SUNXI > > + select DMA_ENGINE > > + select DMA_VIRTUAL_CHANNELS > > + help > > + Support for the DMA engine for Allwinner A31 SoCs. > > + > > config DMA_ENGINE > > bool > > > > diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile > > index a029d0f4..18cdbad 100644 > > --- a/drivers/dma/Makefile > > +++ b/drivers/dma/Makefile > > @@ -44,3 +44,4 @@ obj-$(CONFIG_DMA_JZ4740) += dma-jz4740.o > > obj-$(CONFIG_TI_CPPI41) += cppi41.o > > obj-$(CONFIG_K3_DMA) += k3dma.o > > obj-$(CONFIG_MOXART_DMA) += moxart-dma.o > > +obj-$(CONFIG_DMA_SUN6I) += sun6i-dma.o > > diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c > > new file mode 100644 > > index 0000000..ba852f0 > > --- /dev/null > > +++ b/drivers/dma/sun6i-dma.c > > @@ -0,0 +1,959 @@ > > +/* > > + * Copyright (C) 2013-2014 Allwinner Tech Co., Ltd > > + * Author: Sugar <shuge@xxxxxxxxxxxxxxxxx> > > + * > > + * Copyright (C) 2014 Maxime Ripard > > + * Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> > > + * > > + * This program is free software; you can redistribute it and/or modify > > + * it under the terms of the GNU General Public License as published by > > + * the Free Software Foundation; either version 2 of the License, or > > + * (at your option) any later version. > > + */ > > + > > +#include <linux/clk.h> > > +#include <linux/delay.h> > > +#include <linux/dmaengine.h> > > +#include <linux/dmapool.h> > > +#include <linux/interrupt.h> > > +#include <linux/module.h> > > +#include <linux/of_dma.h> > > +#include <linux/platform_device.h> > > +#include <linux/reset.h> > > +#include <linux/slab.h> > > +#include <linux/types.h> > > + > > +#include "virt-dma.h" > > + > > +/* > > + * There's 16 physical channels that can work in parallel. > > + * > > + * However we have 30 different endpoints for our requests. > > + * > > + * Since the channels are able to handle only an unidirectional > > + * transfer, we need to allocate more virtual channels so that > > + * everyone can grab one channel. > > + * > > + * Some devices can't work in both direction (mostly because it > > + * wouldn't make sense), so we have a bit fewer virtual channels than > > + * 2 channels per endpoints. > > + */ > > + > > +#define NR_MAX_CHANNELS 16 > > +#define NR_MAX_REQUESTS 30 > > +#define NR_MAX_VCHANS 53 > > + > > +/* > > + * Common registers > > + */ > > +#define DMA_IRQ_EN(x) ((x) * 0x04) > > +#define DMA_IRQ_HALF BIT(0) > > +#define DMA_IRQ_PKG BIT(1) > > +#define DMA_IRQ_QUEUE BIT(2) > > + > > +#define DMA_IRQ_CHAN_NR 8 > > +#define DMA_IRQ_CHAN_WIDTH 4 > > + > > + > > +#define DMA_IRQ_STAT(x) ((x) * 0x04 + 0x10) > > + > > +#define DMA_STAT 0x30 > > + > > +/* > > + * Channels specific registers > > + */ > > +#define DMA_CHAN_ENABLE 0x00 > > +#define DMA_CHAN_ENABLE_START BIT(0) > > +#define DMA_CHAN_ENABLE_STOP 0 > > + > > +#define DMA_CHAN_PAUSE 0x04 > > +#define DMA_CHAN_PAUSE_PAUSE BIT(1) > > +#define DMA_CHAN_PAUSE_RESUME 0 > > + > > +#define DMA_CHAN_LLI_ADDR 0x08 > > + > > +#define DMA_CHAN_CUR_CFG 0x0c > > +#define DMA_CHAN_CFG_SRC_DRQ(x) ((x) & 0x1f) > > +#define DMA_CHAN_CFG_SRC_IO_MODE BIT(5) > > +#define DMA_CHAN_CFG_SRC_LINEAR_MODE (0 << 5) > > +#define DMA_CHAN_CFG_SRC_BURST(x) (((x) & 0x3) << 7) > > +#define DMA_CHAN_CFG_SRC_WIDTH(x) (((x) & 0x3) << 9) > > + > > +#define DMA_CHAN_CFG_DST_DRQ(x) (DMA_CHAN_CFG_SRC_DRQ(x) << 16) > > +#define DMA_CHAN_CFG_DST_IO_MODE (DMA_CHAN_CFG_SRC_IO_MODE << 16) > > +#define DMA_CHAN_CFG_DST_LINEAR_MODE (DMA_CHAN_CFG_SRC_LINEAR_MODE << 16) > > +#define DMA_CHAN_CFG_DST_BURST(x) (DMA_CHAN_CFG_SRC_BURST(x) << 16) > > +#define DMA_CHAN_CFG_DST_WIDTH(x) (DMA_CHAN_CFG_SRC_WIDTH(x) << 16) > > + > > +#define DMA_CHAN_CUR_SRC 0x10 > > + > > +#define DMA_CHAN_CUR_DST 0x14 > > + > > +#define DMA_CHAN_CUR_CNT 0x18 > > + > > +#define DMA_CHAN_CUR_PARA 0x1c > > + > > + > > +/* > > + * Various hardware related defines > > + */ > > +#define LLI_LAST_ITEM 0xfffff800 > > +#define NORMAL_WAIT 8 > > +#define DRQ_SDRAM 1 > > + > > +/* > > + * Hardware representation of the LLI > > + * > > + * The hardware will be fed the physical address of this structure, > > + * and read its content in order to start the transfer. > > + */ > > +struct sun6i_dma_lli { > > + u32 cfg; > > + u32 src; > > + u32 dst; > > + u32 len; > > + u32 para; > > + u32 p_lli_next; > > + struct sun6i_dma_lli *v_lli_next; > > +} __packed; > > + > > + > > +struct sun6i_desc { > > + struct virt_dma_desc vd; > > + dma_addr_t p_lli; > > + struct sun6i_dma_lli *v_lli; > > +}; > > + > > +struct sun6i_pchan { > > + u32 idx; > > + void __iomem *base; > > + struct sun6i_vchan *vchan; > > + struct sun6i_desc *desc; > > + struct sun6i_desc *done; > > +}; > > + > > +struct sun6i_vchan { > > + struct virt_dma_chan vc; > > + struct list_head node; > > + struct dma_slave_config cfg; > > + struct sun6i_pchan *phy; > > + u8 port; > > +}; > > + > > +struct sun6i_dma_dev { > > + struct dma_device slave; > > + void __iomem *base; > > + struct clk *clk; > > + struct reset_control *rstc; > > + spinlock_t lock; > > + struct tasklet_struct task; > > + struct list_head pending; > > + struct dma_pool *pool; > > + struct sun6i_pchan *pchans; > > + struct sun6i_vchan *vchans; > > +}; > > + > > +static struct device *chan2dev(struct dma_chan *chan) > > +{ > > + return &chan->dev->device; > > +} > > + > > +static inline struct sun6i_dma_dev *to_sun6i_dma_dev(struct dma_device *d) > > +{ > > + return container_of(d, struct sun6i_dma_dev, slave); > > +} > > + > > +static inline struct sun6i_vchan *to_sun6i_vchan(struct dma_chan *chan) > > +{ > > + return container_of(chan, struct sun6i_vchan, vc.chan); > > +} > > + > > +static inline struct sun6i_desc * > > +to_sun6i_desc(struct dma_async_tx_descriptor *tx) > > +{ > > + return container_of(tx, struct sun6i_desc, vd.tx); > > +} > > + > > +static inline void sun6i_dma_dump_com_regs(struct sun6i_dma_dev *sdev) > > +{ > > + dev_dbg(sdev->slave.dev, "Common register:\n" > > + "\tmask0(%04x): 0x%08x\n" > > + "\tmask1(%04x): 0x%08x\n" > > + "\tpend0(%04x): 0x%08x\n" > > + "\tpend1(%04x): 0x%08x\n" > > + "\tstats(%04x): 0x%08x\n", > > + DMA_IRQ_EN(0), readl(sdev->base + DMA_IRQ_EN(0)), > > + DMA_IRQ_EN(1), readl(sdev->base + DMA_IRQ_EN(1)), > > + DMA_IRQ_STAT(0), readl(sdev->base + DMA_IRQ_STAT(0)), > > + DMA_IRQ_STAT(1), readl(sdev->base + DMA_IRQ_STAT(1)), > > + DMA_STAT, readl(sdev->base + DMA_STAT)); > > +} > > + > > +static inline void sun6i_dma_dump_chan_regs(struct sun6i_dma_dev *sdev, > > + struct sun6i_pchan *pchan) > > +{ > > + dev_dbg(sdev->slave.dev, "Chan %d reg: 0x%x\n" > > I'm not sure this is right specifier. For phys_addr_t and dma_addr_t > consider to use %pa[d]. Please, check entire code for that. I wasn't aware of these formats, thanks for pointing this out. > > > + "\t___en(%04x): \t0x%08x\n" > > + "\tpause(%04x): \t0x%08x\n" > > + "\tstart(%04x): \t0x%08x\n" > > + "\t__cfg(%04x): \t0x%08x\n" > > + "\t__src(%04x): \t0x%08x\n" > > + "\t__dst(%04x): \t0x%08x\n" > > + "\tcount(%04x): \t0x%08x\n" > > + "\t_para(%04x): \t0x%08x\n\n", > > + pchan->idx, __virt_to_phys((unsigned long)pchan->base), > > + DMA_CHAN_ENABLE, > > + readl(pchan->base + DMA_CHAN_ENABLE), > > + DMA_CHAN_PAUSE, > > + readl(pchan->base + DMA_CHAN_PAUSE), > > + DMA_CHAN_LLI_ADDR, > > + readl(pchan->base + DMA_CHAN_LLI_ADDR), > > + DMA_CHAN_CUR_CFG, > > + readl(pchan->base + DMA_CHAN_CUR_CFG), > > + DMA_CHAN_CUR_SRC, > > + readl(pchan->base + DMA_CHAN_CUR_SRC), > > + DMA_CHAN_CUR_DST, > > + readl(pchan->base + DMA_CHAN_CUR_DST), > > + DMA_CHAN_CUR_CNT, > > + readl(pchan->base + DMA_CHAN_CUR_CNT), > > + DMA_CHAN_CUR_PARA, > > + readl(pchan->base + DMA_CHAN_CUR_PARA)); > > +} > > + > > +static inline u8 convert_burst(u8 maxburst) > > +{ > > + if (maxburst == 1 || maxburst > 16) > > + return 0; > > + > > + return fls(maxburst) - 1; > > +} > > + > > +static inline u8 convert_buswidth(enum dma_slave_buswidth addr_width) > > +{ > > + switch (addr_width) { > > + case DMA_SLAVE_BUSWIDTH_2_BYTES: > > + return 1; > > + case DMA_SLAVE_BUSWIDTH_4_BYTES: > > + return 2; > > + default: > > + return 0; > > + } > > +} > > + > > +static void *sun6i_dma_lli_add(struct sun6i_dma_lli *prev, > > + struct sun6i_dma_lli *next, > > + dma_addr_t next_phy, > > + struct sun6i_desc *txd) > > +{ > > + if ((!prev && !txd) || !next) > > + return NULL; > > + > > + if (!prev) { > > + txd->p_lli = next_phy; > > + txd->v_lli = next; > > + } else { > > + prev->p_lli_next = next_phy; > > + prev->v_lli_next = next; > > + } > > + > > + next->p_lli_next = LLI_LAST_ITEM; > > + next->v_lli_next = NULL; > > + > > + return next; > > +} > > + > > +static inline void sun6i_dma_cfg_lli(struct sun6i_dma_lli *lli, > > + dma_addr_t src, > > + dma_addr_t dst, u32 len, > > + struct dma_slave_config *config) > > +{ > > + u32 src_width, dst_width, src_burst, dst_burst; > > + > > + if (!config) > > + return; > > + > > + src_burst = convert_burst(config->src_maxburst); > > + dst_burst = convert_burst(config->dst_maxburst); > > + > > + src_width = convert_buswidth(config->src_addr_width); > > + dst_width = convert_buswidth(config->dst_addr_width); > > + > > + lli->cfg = DMA_CHAN_CFG_SRC_BURST(src_burst) | > > + DMA_CHAN_CFG_SRC_WIDTH(src_width) | > > + DMA_CHAN_CFG_DST_BURST(dst_burst) | > > + DMA_CHAN_CFG_DST_WIDTH(dst_width); > > + > > + lli->src = src; > > + lli->dst = dst; > > + lli->len = len; > > + lli->para = NORMAL_WAIT; > > + > > +} > > + > > +static inline void sun6i_dma_dump_lli(struct sun6i_vchan *vchan, > > + struct sun6i_dma_lli *lli) > > +{ > > + dev_dbg(chan2dev(&vchan->vc.chan), > > + "\n\tdesc: p - 0x%08x v - 0x%08x\n" > > + "\t\tc - 0x%08x s - 0x%08x d - 0x%08x\n" > > + "\t\tl - 0x%08x p - 0x%08x n - 0x%08x\n", > > + __virt_to_phys((unsigned long)lli), (u32)lli, > > + lli->cfg, lli->src, lli->dst, > > + lli->len, lli->para, lli->p_lli_next); > > +} > > + > > +static void sun6i_dma_free_desc(struct virt_dma_desc *vd) > > +{ > > + struct sun6i_desc *txd = to_sun6i_desc(&vd->tx); > > + struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(vd->tx.chan->device); > > + struct sun6i_dma_lli *v_lli, *v_next; > > + dma_addr_t p_lli, p_next; > > + > > + if (unlikely(!txd)) > > + return; > > + > > + p_lli = txd->p_lli; > > + v_lli = txd->v_lli; > > + > > + while (v_lli) { > > + v_next = v_lli->v_lli_next; > > + p_next = v_lli->p_lli_next; > > + > > + dma_pool_free(sdev->pool, v_lli, p_lli); > > + > > + v_lli = v_next; > > + p_lli = p_next; > > + } > > + > > + kfree(txd); > > +} > > + > > +static int sun6i_dma_terminate_all(struct sun6i_vchan *vchan) > > +{ > > + struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(vchan->vc.chan.device); > > + struct sun6i_pchan *pchan = vchan->phy; > > + unsigned long flags; > > + LIST_HEAD(head); > > + > > + spin_lock(&sdev->lock); > > + list_del_init(&vchan->node); > > + spin_unlock(&sdev->lock); > > + > > + spin_lock_irqsave(&vchan->vc.lock, flags); > > + > > + vchan_get_all_descriptors(&vchan->vc, &head); > > + > > + if (pchan) { > > + writel(DMA_CHAN_ENABLE_STOP, pchan->base + DMA_CHAN_ENABLE); > > + writel(DMA_CHAN_PAUSE_RESUME, pchan->base + DMA_CHAN_PAUSE); > > + > > + vchan->phy = NULL; > > + pchan->vchan = NULL; > > + pchan->desc = NULL; > > + pchan->done = NULL; > > + } > > + > > + spin_unlock_irqrestore(&vchan->vc.lock, flags); > > + > > + vchan_dma_desc_free_list(&vchan->vc, &head); > > + > > + return 0; > > +} > > + > > +static int sun6i_dma_start_desc(struct sun6i_vchan *vchan) > > +{ > > + struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(vchan->vc.chan.device); > > + struct virt_dma_desc *desc = vchan_next_desc(&vchan->vc); > > + struct sun6i_pchan *pchan = vchan->phy; > > + u32 irq_val, irq_reg, irq_offset; > > + > > + if (!pchan) > > + return -EAGAIN; > > + > > + if (!desc) { > > + pchan->desc = NULL; > > + pchan->done = NULL; > > + return -EAGAIN; > > + } > > + > > + list_del(&desc->node); > > + > > + pchan->desc = to_sun6i_desc(&desc->tx); > > + pchan->done = NULL; > > + > > + sun6i_dma_dump_lli(vchan, pchan->desc->v_lli); > > + > > + irq_reg = pchan->idx / DMA_IRQ_CHAN_NR; > > + irq_offset = pchan->idx % DMA_IRQ_CHAN_NR; > > + > > + irq_val = readl(sdev->base + DMA_IRQ_EN(irq_offset)); > > + irq_val |= DMA_IRQ_QUEUE << (irq_offset * DMA_IRQ_CHAN_WIDTH); > > + writel(irq_val, sdev->base + DMA_IRQ_EN(irq_offset)); > > + > > + writel(pchan->desc->p_lli, pchan->base + DMA_CHAN_LLI_ADDR); > > + writel(DMA_CHAN_ENABLE_START, pchan->base + DMA_CHAN_ENABLE); > > + > > + sun6i_dma_dump_com_regs(sdev); > > + sun6i_dma_dump_chan_regs(sdev, pchan); > > + > > + return 0; > > +} > > + > > +static void sun6i_dma_tasklet(unsigned long data) > > +{ > > + struct sun6i_dma_dev *sdev = (struct sun6i_dma_dev *)data; > > + struct sun6i_vchan *vchan; > > + struct sun6i_pchan *pchan; > > + unsigned int pchan_alloc = 0; > > + unsigned int pchan_idx; > > + > > + list_for_each_entry(vchan, &sdev->slave.channels, vc.chan.device_node) { > > + spin_lock_irq(&vchan->vc.lock); > > + > > + pchan = vchan->phy; > > + > > + if (pchan && pchan->done) { > > + if (sun6i_dma_start_desc(vchan)) { > > + /* > > + * No current txd associated with this channel > > + */ > > + dev_dbg(sdev->slave.dev, "pchan %u: free\n", > > + pchan->idx); > > + > > + /* Mark this channel free */ > > + vchan->phy = NULL; > > + pchan->vchan = NULL; > > + } > > + } > > + spin_unlock_irq(&vchan->vc.lock); > > + } > > + > > + spin_lock_irq(&sdev->lock); > > + for (pchan_idx = 0; pchan_idx < NR_MAX_CHANNELS; pchan_idx++) { > > + pchan = &sdev->pchans[pchan_idx]; > > + > > + if (pchan->vchan == NULL && !list_empty(&sdev->pending)) { > > + vchan = list_first_entry(&sdev->pending, > > + struct sun6i_vchan, node); > > + > > + /* Remove from pending channels */ > > + list_del_init(&vchan->node); > > + pchan_alloc |= BIT(pchan_idx); > > + > > + /* Mark this channel allocated */ > > + pchan->vchan = vchan; > > + vchan->phy = pchan; > > + dev_dbg(sdev->slave.dev, "pchan %u: alloc vchan %p\n", > > + pchan->idx, &vchan->vc); > > + } > > + } > > + spin_unlock_irq(&sdev->lock); > > + > > + for (pchan_idx = 0; pchan_idx < NR_MAX_CHANNELS; pchan_idx++) { > > + if (pchan_alloc & BIT(pchan_idx)) { > > + pchan = sdev->pchans + pchan_idx; > > + vchan = pchan->vchan; > > + if (vchan) { > > + spin_lock_irq(&vchan->vc.lock); > > + sun6i_dma_start_desc(vchan); > > + spin_unlock_irq(&vchan->vc.lock); > > + } > > + } > > + } > > +} > > + > > +static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id) > > +{ > > + struct sun6i_dma_dev *sdev = (struct sun6i_dma_dev *)dev_id; > > + struct sun6i_vchan *vchan; > > + struct sun6i_pchan *pchan; > > + int i, j, ret = IRQ_NONE; > > + u32 status; > > + > > + for (i = 0; i < 2; i++) { > > + status = readl(sdev->base + DMA_IRQ_STAT(i)); > > + if (!status) > > + continue; > > + > > + dev_dbg(sdev->slave.dev, "DMA irq status %s: 0x%x\n", > > + i ? "high" : "low", status); > > + > > + writel(status, sdev->base + DMA_IRQ_STAT(i)); > > + > > + for (j = 0; (j < 8) && status; j++) { > > + if (status & DMA_IRQ_QUEUE) { > > + pchan = sdev->pchans + j; > > + vchan = pchan->vchan; > > + > > + if (vchan) { > > + unsigned long flags; > > + > > + spin_lock_irqsave(&vchan->vc.lock, > > + flags); > > + vchan_cookie_complete(&pchan->desc->vd); > > + pchan->done = pchan->desc; > > + spin_unlock_irqrestore(&vchan->vc.lock, > > + flags); > > + } > > + } > > + > > + status = status >> 4; > > + } > > + > > + tasklet_schedule(&sdev->task); > > + ret = IRQ_HANDLED; > > + } > > + > > + return ret; > > +} > > + > > +static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_memcpy( > > + struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, > > + size_t len, unsigned long flags) > > +{ > > + struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device); > > + struct sun6i_vchan *vchan = to_sun6i_vchan(chan); > > + struct dma_slave_config *sconfig = &vchan->cfg; > > + struct sun6i_dma_lli *v_lli; > > + struct sun6i_desc *txd; > > + dma_addr_t p_lli; > > + > > + dev_dbg(chan2dev(chan), > > + "%s; chan: %d, dest: 0x%08x, src: 0x%08x, len: 0x%08x. flags: 0x%08lx\n", > > + __func__, vchan->vc.chan.chan_id, dest, src, len, flags); > > + > > + if (!len) > > + return NULL; > > + > > + txd = kzalloc(sizeof(*txd), GFP_NOWAIT); > > + if (!txd) > > + return NULL; > > + > > + v_lli = dma_pool_alloc(sdev->pool, GFP_NOWAIT, &p_lli); > > + if (!v_lli) { > > + dev_err(sdev->slave.dev, "Failed to alloc lli memory\n"); > > + kfree(txd); > > + return NULL; > > + } > > + > > + sun6i_dma_cfg_lli(v_lli, src, dest, len, sconfig); > > + v_lli->cfg |= DMA_CHAN_CFG_SRC_DRQ(DRQ_SDRAM) | > > + DMA_CHAN_CFG_DST_DRQ(DRQ_SDRAM) | > > + DMA_CHAN_CFG_DST_LINEAR_MODE | > > + DMA_CHAN_CFG_SRC_LINEAR_MODE; > > + > > + sun6i_dma_lli_add(NULL, v_lli, p_lli, txd); > > + > > + sun6i_dma_dump_lli(vchan, v_lli); > > + > > + return vchan_tx_prep(&vchan->vc, &txd->vd, flags); > > +} > > + > > +static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg( > > + struct dma_chan *chan, struct scatterlist *sgl, > > + unsigned int sg_len, enum dma_transfer_direction dir, > > + unsigned long flags, void *context) > > +{ > > + struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device); > > + struct sun6i_vchan *vchan = to_sun6i_vchan(chan); > > + struct dma_slave_config *sconfig = &vchan->cfg; > > + struct sun6i_dma_lli *v_lli, *prev = NULL; > > + struct sun6i_desc *txd; > > + struct scatterlist *sg; > > + dma_addr_t p_lli; > > + int i; > > + > > + if (!sgl) > > + return NULL; > > + > > + txd = kzalloc(sizeof(*txd), GFP_NOWAIT); > > + if (!txd) > > + return NULL; > > + > > + for_each_sg(sgl, sg, sg_len, i) { > > + v_lli = dma_pool_alloc(sdev->pool, GFP_NOWAIT, &p_lli); > > + if (!v_lli) { > > + kfree(txd); > > + return NULL; > > + } > > + > > + if (dir == DMA_MEM_TO_DEV) { > > + sun6i_dma_cfg_lli(v_lli, sg_dma_address(sg), > > + sconfig->dst_addr, sg_dma_len(sg), > > + sconfig); > > + v_lli->cfg |= DMA_CHAN_CFG_DST_IO_MODE | > > + DMA_CHAN_CFG_SRC_LINEAR_MODE | > > + DMA_CHAN_CFG_SRC_DRQ(DRQ_SDRAM) | > > + DMA_CHAN_CFG_DST_DRQ(vchan->port); > > + > > + dev_dbg(chan2dev(chan), "%s; chan: %d, dest: 0x%08x, " > > + "src: 0x%08x, len: 0x%08x. flags: 0x%08lx\n", > > + __func__, vchan->vc.chan.chan_id, > > + sconfig->dst_addr, sg_dma_address(sg), > > + sg_dma_len(sg), flags); > > + > > + } else if (dir == DMA_DEV_TO_MEM) { > > + sun6i_dma_cfg_lli(v_lli, sconfig->src_addr, > > + sg_dma_address(sg), sg_dma_len(sg), > > + sconfig); > > + v_lli->cfg |= DMA_CHAN_CFG_DST_LINEAR_MODE | > > + DMA_CHAN_CFG_SRC_IO_MODE | > > + DMA_CHAN_CFG_DST_DRQ(DRQ_SDRAM) | > > + DMA_CHAN_CFG_SRC_DRQ(vchan->port); > > + > > + dev_dbg(chan2dev(chan), "%s; chan: %d, dest: 0x%08x, " > > + "src: 0x%08x, len: 0x%08x. flags: 0x%08lx\n", > > + __func__, vchan->vc.chan.chan_id, > > + sg_dma_address(sg), sconfig->src_addr, > > + sg_dma_len(sg), flags); > > + } > > + > > + prev = sun6i_dma_lli_add(prev, v_lli, p_lli, txd); > > + } > > + > > +#ifdef DEBUG > > + dev_dbg(chan2dev(chan), "First: 0x%08x\n", txd->p_lli); > > + for (prev = txd->v_lli; prev != NULL; prev = prev->v_lli_next) > > + sun6i_dma_dump_lli(vchan, prev); > > +#endif > > + > > + return vchan_tx_prep(&vchan->vc, &txd->vd, flags); > > +} > > + > > +static int sun6i_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, > > + unsigned long arg) > > +{ > > + struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device); > > + struct sun6i_vchan *vchan = to_sun6i_vchan(chan); > > + struct sun6i_pchan *pchan = vchan->phy; > > + unsigned long flags; > > + int ret = 0; > > + > > + switch (cmd) { > > + case DMA_RESUME: > > + dev_dbg(chan2dev(chan), "vchan %p: resume\n", &vchan->vc); > > + > > + spin_lock_irqsave(&vchan->vc.lock, flags); > > + > > + if (pchan) { > > + writel(DMA_CHAN_PAUSE_RESUME, > > + pchan->base + DMA_CHAN_PAUSE); > > + } else if (!list_empty(&vchan->vc.desc_issued)) { > > + spin_lock(&sdev->lock); > > + list_add_tail(&vchan->node, &sdev->pending); > > + spin_unlock(&sdev->lock); > > + } > > + > > + spin_unlock_irqrestore(&vchan->vc.lock, flags); > > + break; > > + > > + case DMA_PAUSE: > > + dev_dbg(chan2dev(chan), "vchan %p: pause\n", &vchan->vc); > > + > > + if (pchan) { > > + writel(DMA_CHAN_PAUSE_PAUSE, > > + pchan->base + DMA_CHAN_PAUSE); > > + } else { > > + spin_lock(&sdev->lock); > > + list_del_init(&vchan->node); > > + spin_unlock(&sdev->lock); > > + } > > + break; > > + > > + case DMA_TERMINATE_ALL: > > + ret = sun6i_dma_terminate_all(vchan); > > + break; > > + case DMA_SLAVE_CONFIG: > > + memcpy(&vchan->cfg, (struct dma_slave_config *)arg, > > + sizeof(struct dma_slave_config)); > > + break; > > + default: > > + ret = -ENXIO; > > + break; > > + } > > + return ret; > > +} > > + > > +static enum dma_status sun6i_dma_tx_status(struct dma_chan *chan, > > + dma_cookie_t cookie, > > + struct dma_tx_state *state) > > +{ > > + struct sun6i_vchan *vchan = to_sun6i_vchan(chan); > > + struct sun6i_pchan *pchan = vchan->phy; > > + struct sun6i_dma_lli *lli; > > + struct virt_dma_desc *vd; > > + struct sun6i_desc *txd; > > + enum dma_status ret; > > + unsigned long flags; > > + size_t bytes = 0; > > + > > + ret = dma_cookie_status(chan, cookie, state); > > + if (ret == DMA_COMPLETE) > > + return ret; > > + > > + spin_lock_irqsave(&vchan->vc.lock, flags); > > + > > + vd = vchan_find_desc(&vchan->vc, cookie); > > + txd = to_sun6i_desc(&vd->tx); > > + > > + if (vd) { > > + for (lli = txd->v_lli; lli != NULL; lli = lli->v_lli_next) > > + bytes += lli->len; > > + } else if (!pchan || !pchan->desc) { > > + bytes = 0; > > + } else { > > + bytes = readl(pchan->base + DMA_CHAN_CUR_CNT); > > + } > > + > > + spin_unlock_irqrestore(&vchan->vc.lock, flags); > > + > > + dma_set_residue(state, bytes); > > + > > + return ret; > > +} > > + > > +static void sun6i_dma_issue_pending(struct dma_chan *chan) > > +{ > > + struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device); > > + struct sun6i_vchan *vchan = to_sun6i_vchan(chan); > > + unsigned long flags; > > + > > + spin_lock_irqsave(&vchan->vc.lock, flags); > > + > > + if (vchan_issue_pending(&vchan->vc)) { > > + spin_lock(&sdev->lock); > > + > > + if (!vchan->phy) { > > + if (list_empty(&vchan->node)) { > > + list_add_tail(&vchan->node, &sdev->pending); > > + tasklet_schedule(&sdev->task); > > + dev_dbg(chan2dev(chan), "vchan %p: issued\n", > > + &vchan->vc); > > + } > > + } > > + > > + spin_unlock(&sdev->lock); > > + } else { > > + dev_dbg(chan2dev(chan), "vchan %p: nothing to issue\n", > > + &vchan->vc); > > + } > > + > > + spin_unlock_irqrestore(&vchan->vc.lock, flags); > > +} > > + > > +static int sun6i_dma_alloc_chan_resources(struct dma_chan *chan) > > +{ > > + return 0; > > +} > > + > > +static void sun6i_dma_free_chan_resources(struct dma_chan *chan) > > +{ > > + struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device); > > + struct sun6i_vchan *vchan = to_sun6i_vchan(chan); > > + unsigned long flags; > > + > > + spin_lock_irqsave(&sdev->lock, flags); > > + list_del_init(&vchan->node); > > + spin_unlock_irqrestore(&sdev->lock, flags); > > + > > + vchan_free_chan_resources(&vchan->vc); > > +} > > + > > +static inline void sun6i_dma_free(struct sun6i_dma_dev *sdc) > > +{ > > + int i; > > + > > + for (i = 0; i < NR_MAX_VCHANS; i++) { > > + struct sun6i_vchan *vchan = &sdc->vchans[i]; > > + > > + list_del(&vchan->vc.chan.device_node); > > + tasklet_kill(&vchan->vc.task); > > + } > > + > > + tasklet_kill(&sdc->task); > > +} > > + > > +static struct dma_chan *sun6i_dma_of_xlate(struct of_phandle_args *dma_spec, > > + struct of_dma *ofdma) > > +{ > > + struct sun6i_dma_dev *sdev = ofdma->of_dma_data; > > + struct sun6i_vchan *vchan; > > + struct dma_chan *chan; > > + u8 port = dma_spec->args[0]; > > + > > + if (port > NR_MAX_REQUESTS) > > + return NULL; > > + > > + chan = dma_get_any_slave_channel(&sdev->slave); > > + if (!chan) > > + return NULL; > > + > > + vchan = to_sun6i_vchan(chan); > > + vchan->port = port; > > + > > + return chan; > > +} > > + > > +static int sun6i_dma_probe(struct platform_device *pdev) > > +{ > > + struct sun6i_dma_dev *sdc; > > + struct resource *res; > > + int irq; > > + int ret, i; > > + > > + sdc = devm_kzalloc(&pdev->dev, sizeof(*sdc), GFP_KERNEL); > > + if (!sdc) > > + return -ENOMEM; > > + > > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > > + sdc->base = devm_ioremap_resource(&pdev->dev, res); > > + if (IS_ERR(sdc->base)) > > + return PTR_ERR(sdc->base); > > + > > + irq = platform_get_irq(pdev, 0); > > + ret = devm_request_irq(&pdev->dev, irq, sun6i_dma_interrupt, 0, > > + dev_name(&pdev->dev), sdc); > > + if (ret) { > > + dev_err(&pdev->dev, "Cannot request IRQ\n"); > > + return ret; > > + } > > + > > + sdc->clk = devm_clk_get(&pdev->dev, NULL); > > + if (IS_ERR(sdc->clk)) { > > + dev_err(&pdev->dev, "No clock specified\n"); > > + return PTR_ERR(sdc->clk); > > + } > > + > > + sdc->rstc = devm_reset_control_get(&pdev->dev, NULL); > > + if (IS_ERR(sdc->rstc)) { > > + dev_err(&pdev->dev, "No reset controller specified\n"); > > + return PTR_ERR(sdc->rstc); > > + } > > + > > + sdc->pool = dmam_pool_create(dev_name(&pdev->dev), &pdev->dev, > > + sizeof(struct sun6i_dma_lli), 4, 0); > > + if (!sdc->pool) { > > + dev_err(&pdev->dev, "No memory for descriptors dma pool\n"); > > + return -ENOMEM; > > + } > > + > > + platform_set_drvdata(pdev, sdc); > > + INIT_LIST_HEAD(&sdc->pending); > > + spin_lock_init(&sdc->lock); > > + > > + dma_cap_set(DMA_PRIVATE, sdc->slave.cap_mask); > > + dma_cap_set(DMA_MEMCPY, sdc->slave.cap_mask); > > + dma_cap_set(DMA_SLAVE, sdc->slave.cap_mask); > > + > > + INIT_LIST_HEAD(&sdc->slave.channels); > > + sdc->slave.device_alloc_chan_resources = sun6i_dma_alloc_chan_resources; > > + sdc->slave.device_free_chan_resources = sun6i_dma_free_chan_resources; > > + sdc->slave.device_tx_status = sun6i_dma_tx_status; > > + sdc->slave.device_issue_pending = sun6i_dma_issue_pending; > > + sdc->slave.device_prep_slave_sg = sun6i_dma_prep_slave_sg; > > + sdc->slave.device_prep_dma_memcpy = sun6i_dma_prep_dma_memcpy; > > + sdc->slave.device_control = sun6i_dma_control; > > + sdc->slave.chancnt = NR_MAX_VCHANS; > > + > > + sdc->slave.dev = &pdev->dev; > > + > > + sdc->pchans = devm_kzalloc(&pdev->dev, > > + NR_MAX_CHANNELS * sizeof(struct sun6i_pchan), > > + GFP_KERNEL); > > Sorry, forgot to mention devm_kcalloc. It suits better here. > > > + if (!sdc->pchans) > > + return -ENOMEM; > > + > > + sdc->vchans = devm_kzalloc(&pdev->dev, > > + NR_MAX_VCHANS * sizeof(struct sun6i_vchan), > > + GFP_KERNEL); > > And here. Right. Will fix. > > > + if (!sdc->vchans) > > + return -ENOMEM; > > + > > + tasklet_init(&sdc->task, sun6i_dma_tasklet, (unsigned long)sdc); > > + > > + for (i = 0; i < NR_MAX_CHANNELS; i++) { > > + struct sun6i_pchan *pchan = &sdc->pchans[i]; > > + > > + pchan->idx = i; > > + pchan->base = sdc->base + 0x100 + i * 0x40; > > + } > > + > > + for (i = 0; i < NR_MAX_VCHANS; i++) { > > + struct sun6i_vchan *vchan = &sdc->vchans[i]; > > + > > + INIT_LIST_HEAD(&vchan->node); > > + vchan->vc.desc_free = sun6i_dma_free_desc; > > + vchan_init(&vchan->vc, &sdc->slave); > > + } > > + > > + ret = reset_control_deassert(sdc->rstc); > > + if (ret) { > > + dev_err(&pdev->dev, "Couldn't deassert the device from reset\n"); > > + goto err_chan_free; > > + } > > + > > + ret = clk_prepare_enable(sdc->clk); > > + if (ret) { > > + dev_err(&pdev->dev, "Couldn't enable the clock\n"); > > + goto err_reset_assert; > > + } > > + > > + ret = dma_async_device_register(&sdc->slave); > > + if (ret) { > > + dev_warn(&pdev->dev, "Failed to register DMA engine device\n"); > > + goto err_clk_disable; > > + } > > + > > + ret = of_dma_controller_register(pdev->dev.of_node, sun6i_dma_of_xlate, > > + sdc); > > + if (ret) { > > + dev_err(&pdev->dev, "of_dma_controller_register failed\n"); > > + goto err_dma_unregister; > > + } > > + > > + return 0; > > + > > +err_dma_unregister: > > + dma_async_device_unregister(&sdc->slave); > > +err_clk_disable: > > + clk_disable_unprepare(sdc->clk); > > +err_reset_assert: > > + reset_control_assert(sdc->rstc); > > +err_chan_free: > > + sun6i_dma_free(sdc); > > + return ret; > > +} > > + > > +static int sun6i_dma_remove(struct platform_device *pdev) > > +{ > > + struct sun6i_dma_dev *sdc = platform_get_drvdata(pdev); > > + > > + of_dma_controller_free(pdev->dev.of_node); > > + dma_async_device_unregister(&sdc->slave); > > + > > + clk_disable_unprepare(sdc->clk); > > + reset_control_assert(sdc->rstc); > > + > > + sun6i_dma_free(sdc); > > + > > + return 0; > > +} > > + > > +static struct of_device_id sun6i_dma_match[] = { > > + { .compatible = "allwinner,sun6i-a31-dma" } > > +}; > > + > > +static struct platform_driver sun6i_dma_driver = { > > + .probe = sun6i_dma_probe, > > + .remove = sun6i_dma_remove, > > + .driver = { > > + .name = "sun6i-dma", > > + .of_match_table = sun6i_dma_match, > > + }, > > +}; > > +module_platform_driver(sun6i_dma_driver); > > + > > +MODULE_DESCRIPTION("Allwinner A31 DMA Controller Driver"); > > +MODULE_AUTHOR("Sugar <shuge@xxxxxxxxxxxxxxxxx>"); > > +MODULE_AUTHOR("Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>"); > > +MODULE_LICENSE("GPL"); Thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com
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