Hi, Vinod, Mark and other maintainers, Could you please help review this Freescale eDMA driver and the dts binding. Many thanks!
Best Regards, Jingchang > -----Original Message----- > From: Jingchang Lu [mailto:b35...@freescale.com] > Sent: Thursday, January 02, 2014 2:52 PM > To: vinod.k...@intel.com > Cc: dan.j.willi...@intel.com; shawn....@linaro.org; pawel.m...@arm.com; > mark.rutl...@arm.com; swar...@wwwdotorg.org; linux-ker...@vger.kernel.org; > linux-arm-ker...@lists.infradead.org; devicetree@vger.kernel.org; Lu > Jingchang-B35083; Wang Huan-B18965 > Subject: [PATCHv8 2/2] dma: Add Freescale eDMA engine driver support > > Add Freescale enhanced direct memory(eDMA) controller support. > This module can be found on Vybrid and LS-1 SoCs. > > Signed-off-by: Alison Wang <b18...@freescale.com> > Signed-off-by: Jingchang Lu <b35...@freescale.com> > --- > changes in v8: > change the edma driver according eDMA dts change. > add big-endian and little-endian handling. > > no changes in v4 ~ v7. > > changes in v3: > add vf610 edma dt-bindings namespace with prefix VF610_*. > > changes in v2: > using generic dma-channels property instead of fsl,dma-channels. > > Documentation/devicetree/bindings/dma/fsl-edma.txt | 67 ++ > drivers/dma/Kconfig | 10 + > drivers/dma/Makefile | 1 + > drivers/dma/fsl-edma.c | 939 > +++++++++++++++++++++ > 4 files changed, 1017 insertions(+) > create mode 100644 Documentation/devicetree/bindings/dma/fsl-edma.txt > create mode 100644 drivers/dma/fsl-edma.c > > diff --git a/Documentation/devicetree/bindings/dma/fsl-edma.txt > b/Documentation/devicetree/bindings/dma/fsl-edma.txt > new file mode 100644 > index 0000000..3ff6603 > --- /dev/null > +++ b/Documentation/devicetree/bindings/dma/fsl-edma.txt > @@ -0,0 +1,67 @@ > +* Freescale enhanced Direct Memory Access(eDMA) Controller > + > + The eDMA channels have multiplex capability by programmble memory- > mapped > +register. All channels are split into two groups, called DMAMUX0 and > DMAMUX1, > +specific DMA request source can only be multiplexed by any channel of > certain > +group, DMAMUX0 or DMAMUX1, but not both. > + > +* eDMA Controller > +Required properties: > +- compatible : > + - "fsl,vf610-edma" for eDMA used similar to that on Vybrid vf610 > SoC > +- reg : Specifies base physical address(s) and size of the eDMA > registers. > + The 1st region is eDMA control register's address and size. > + The 2nd and the 3rd regions are programmable channel multiplexing > + control register's address and size. > +- interrupts : Should contain eDMA interrupt > +- interrupt-names : Should be "edma-tx" for transmission interrupt and > + "edma-err" for error interrupt > +- #dma-cells : Must be <2>. > + The 1st cell specifies the DMAMUX(0 for DMAMUX0 and 1 for DMAMUX1). > + Specific request source can only be multiplexed by specific > channels > + group called DMAMUX. > + The 2nd cell specifies the request source(slot). > + See include/dt-bindings/dma/<soc>-edma.h for all the supported > + request sources. > +- dma-channels : Number of channels supported by the controller > +- clocks : Phandle of the DMA channel group block clock of the eDMA > module > +- clock-names : The channel group block clock names > + > + > +Examples: > + > +edma0: dma-controller@40018000 { > + #dma-cells = <2>; > + compatible = "fsl,vf610-edma"; > + reg = <0x40018000 0x2000>, > + <0x40024000 0x1000>, > + <0x40025000 0x1000>; > + interrupts = <0 8 0x04>, > + <0 9 0x04>; > + interrupt-names = "edma-tx", "edma-err"; > + dma-channels = <32>; > + clocks = <&clks VF610_CLK_DMAMUX0>, > + <&clks VF610_CLK_DMAMUX1>; > + clock-names = "dmamux0", "dmamux1"; > +}; > + > + > +* DMA clients > +DMA client drivers that uses the DMA function must use the format > described > +in the dma.txt file, using a two-cell specifier for each channel: the > 1st > +specifies the channel group(DMAMUX) in which this request can be > multiplexed, > +and the 2nd specifies the request source. > + > +Examples: > + > +sai2: sai@40031000 { > + compatible = "fsl,vf610-sai"; > + reg = <0x40031000 0x1000>; > + interrupts = <0 86 0x04>; > + clocks = <&clks VF610_CLK_SAI2>; > + clock-names = "sai"; > + dma-names = "tx", "rx"; > + dmas = <&edma0 VF610_EDMA_DMAMUX0 VF610_EDMA0_MUX0_SAI2_TX>, > + <&edma0 VF610_EDMA_DMAMUX0 VF610_EDMA0_MUX0_SAI2_RX>; > + status = "disabled"; > +}; > diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig > index c10eb89..7989c8c 100644 > --- a/drivers/dma/Kconfig > +++ b/drivers/dma/Kconfig > @@ -336,6 +336,16 @@ config K3_DMA > Support the DMA engine for Hisilicon K3 platform > devices. > > +config FSL_EDMA > + tristate "Freescale eDMA engine support" > + depends on OF > + select DMA_ENGINE > + select DMA_VIRTUAL_CHANNELS > + help > + Support the Freescale eDMA engine with DMAMUXs multiplexing > + DMA request sources(slot) on eDMA engine channels. > + This module can be found on Freescale Vybrid and LS-1 SoCs. > + > config DMA_ENGINE > bool > > diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile > index 0ce2da9..68422af 100644 > --- a/drivers/dma/Makefile > +++ b/drivers/dma/Makefile > @@ -42,3 +42,4 @@ obj-$(CONFIG_MMP_PDMA) += mmp_pdma.o > obj-$(CONFIG_DMA_JZ4740) += dma-jz4740.o > obj-$(CONFIG_TI_CPPI41) += cppi41.o > obj-$(CONFIG_K3_DMA) += k3dma.o > +obj-$(CONFIG_FSL_EDMA) += fsl-edma.o > diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c > new file mode 100644 > index 0000000..9dc27b4 > --- /dev/null > +++ b/drivers/dma/fsl-edma.c > @@ -0,0 +1,939 @@ > +/* > + * drivers/dma/fsl-edma.c > + * > + * Copyright 2013-2014 Freescale Semiconductor, Inc. > + * > + * Driver for the Freescale eDMA engine with flexible channel > multiplexing > + * capability for DMA request sources. The eDMA block can be found on > some > + * Vybrid and Layerscape SoCs. > + * > + * 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/init.h> > +#include <linux/module.h> > +#include <linux/interrupt.h> > +#include <linux/clk.h> > +#include <linux/dma-mapping.h> > +#include <linux/dmapool.h> > +#include <linux/slab.h> > +#include <linux/spinlock.h> > +#include <linux/of.h> > +#include <linux/of_device.h> > +#include <linux/of_address.h> > +#include <linux/of_irq.h> > +#include <linux/of_dma.h> > + > +#include "virt-dma.h" > + > +#define EDMA_CR 0x00 > +#define EDMA_ES 0x04 > +#define EDMA_ERQ 0x0C > +#define EDMA_EEI 0x14 > +#define EDMA_SERQ 0x1B > +#define EDMA_CERQ 0x1A > +#define EDMA_SEEI 0x19 > +#define EDMA_CEEI 0x18 > +#define EDMA_CINT 0x1F > +#define EDMA_CERR 0x1E > +#define EDMA_SSRT 0x1D > +#define EDMA_CDNE 0x1C > +#define EDMA_INTR 0x24 > +#define EDMA_ERR 0x2C > + > +#define EDMA_TCD_SADDR(x) (0x1000 + 32 * (x)) > +#define EDMA_TCD_SOFF(x) (0x1004 + 32 * (x)) > +#define EDMA_TCD_ATTR(x) (0x1006 + 32 * (x)) > +#define EDMA_TCD_NBYTES(x) (0x1008 + 32 * (x)) > +#define EDMA_TCD_SLAST(x) (0x100C + 32 * (x)) > +#define EDMA_TCD_DADDR(x) (0x1010 + 32 * (x)) > +#define EDMA_TCD_DOFF(x) (0x1014 + 32 * (x)) > +#define EDMA_TCD_CITER_ELINK(x) (0x1016 + 32 * (x)) > +#define EDMA_TCD_CITER(x) (0x1016 + 32 * (x)) > +#define EDMA_TCD_DLAST_SGA(x) (0x1018 + 32 * (x)) > +#define EDMA_TCD_CSR(x) (0x101C + 32 * (x)) > +#define EDMA_TCD_BITER_ELINK(x) (0x101E + 32 * (x)) > +#define EDMA_TCD_BITER(x) (0x101E + 32 * (x)) > + > +#define EDMA_CR_EDBG BIT(1) > +#define EDMA_CR_ERCA BIT(2) > +#define EDMA_CR_ERGA BIT(3) > +#define EDMA_CR_HOE BIT(4) > +#define EDMA_CR_HALT BIT(5) > +#define EDMA_CR_CLM BIT(6) > +#define EDMA_CR_EMLM BIT(7) > +#define EDMA_CR_ECX BIT(16) > +#define EDMA_CR_CX BIT(17) > + > +#define EDMA_SEEI_SEEI(x) ((x) & 0x1F) > +#define EDMA_CEEI_CEEI(x) ((x) & 0x1F) > +#define EDMA_CINT_CINT(x) ((x) & 0x1F) > +#define EDMA_CERR_CERR(x) ((x) & 0x1F) > + > +#define EDMA_TCD_ATTR_DSIZE(x) (((x) & 0x0007)) > +#define EDMA_TCD_ATTR_DMOD(x) (((x) & 0x001F) << 3) > +#define EDMA_TCD_ATTR_SSIZE(x) (((x) & 0x0007) << 8) > +#define EDMA_TCD_ATTR_SMOD(x) (((x) & 0x001F) << 11) > +#define EDMA_TCD_ATTR_SSIZE_8BIT (0x0000) > +#define EDMA_TCD_ATTR_SSIZE_16BIT (0x0100) > +#define EDMA_TCD_ATTR_SSIZE_32BIT (0x0200) > +#define EDMA_TCD_ATTR_SSIZE_64BIT (0x0300) > +#define EDMA_TCD_ATTR_SSIZE_32BYTE (0x0500) > +#define EDMA_TCD_ATTR_DSIZE_8BIT (0x0000) > +#define EDMA_TCD_ATTR_DSIZE_16BIT (0x0001) > +#define EDMA_TCD_ATTR_DSIZE_32BIT (0x0002) > +#define EDMA_TCD_ATTR_DSIZE_64BIT (0x0003) > +#define EDMA_TCD_ATTR_DSIZE_32BYTE (0x0005) > + > +#define EDMA_TCD_SOFF_SOFF(x) (x) > +#define EDMA_TCD_NBYTES_NBYTES(x) (x) > +#define EDMA_TCD_SLAST_SLAST(x) (x) > +#define EDMA_TCD_DADDR_DADDR(x) (x) > +#define EDMA_TCD_CITER_CITER(x) ((x) & 0x7FFF) > +#define EDMA_TCD_DOFF_DOFF(x) (x) > +#define EDMA_TCD_DLAST_SGA_DLAST_SGA(x) (x) > +#define EDMA_TCD_BITER_BITER(x) ((x) & 0x7FFF) > + > +#define EDMA_TCD_CSR_START BIT(0) > +#define EDMA_TCD_CSR_INT_MAJOR BIT(1) > +#define EDMA_TCD_CSR_INT_HALF BIT(2) > +#define EDMA_TCD_CSR_D_REQ BIT(3) > +#define EDMA_TCD_CSR_E_SG BIT(4) > +#define EDMA_TCD_CSR_E_LINK BIT(5) > +#define EDMA_TCD_CSR_ACTIVE BIT(6) > +#define EDMA_TCD_CSR_DONE BIT(7) > + > +#define EDMAMUX_CHCFG_DIS 0x0 > +#define EDMAMUX_CHCFG_ENBL 0x80 > +#define EDMAMUX_CHCFG_SOURCE(n) ((n) & 0x3F) > + > +#define DMAMUX_NR 2 > + > +struct fsl_edma_hw_tcd { > + u32 saddr; > + u16 soff; > + u16 attr; > + u32 nbytes; > + u32 slast; > + u32 daddr; > + u16 doff; > + u16 citer; > + u32 dlast_sga; > + u16 csr; > + u16 biter; > +} __packed; > + > +struct fsl_edma_sw_tcd { > + dma_addr_t ptcd; > + struct fsl_edma_hw_tcd *vtcd; > +}; > + > +struct fsl_edma_slave_config { > + enum dma_transfer_direction dir; > + enum dma_slave_buswidth addr_width; > + u32 dev_addr; > + u32 burst; > + u32 attr; > +}; > + > +struct fsl_edma_chan { > + struct virt_dma_chan vchan; > + enum dma_status status; > + struct fsl_edma_engine *edma; > + struct fsl_edma_desc *edesc; > + struct fsl_edma_slave_config fsc; > + struct dma_pool *tcd_pool; > +}; > + > +struct fsl_edma_desc { > + struct virt_dma_desc vdesc; > + struct fsl_edma_chan *echan; > + bool iscyclic; > + unsigned int n_tcds; > + struct fsl_edma_sw_tcd tcd[]; > +}; > + > +struct fsl_edma_engine { > + struct dma_device dma_dev; > + void __iomem *membase; > + void __iomem *muxbase[DMAMUX_NR]; > + struct clk *muxclk[DMAMUX_NR]; > + u32 n_chans; > + int txirq; > + int errirq; > + bool big_endian; > + struct fsl_edma_chan chans[]; > +}; > + > +/* bytes swapping according to eDMA controller's endian */ > +#define EDMA_SWAP16(e, v) (__force u16)(e->big_endian ? > cpu_to_be16(v) : cpu_to_le16(v)) > +#define EDMA_SWAP32(e, v) (__force u32)(e->big_endian ? > cpu_to_be32(v) : cpu_to_le32(v)) > + > +/* > + * copying of ARM read{b,w,l) and write{b,w,l) macro definations > + * except for doing default swap of cpu_to_le32, the bytes swap > + * is done depending on eDMA controller's endian defination, > + * which may be big-endian or little-endian. > + */ > +static inline u8 edma_readb(void __iomem *addr) > +{ > + return readb(addr); > +} > + > +static inline u16 edma_readw(void __iomem *addr) > +{ > + u16 __v = (__force u16) __raw_readw(addr); > + > + __iormb(); > + return __v; > +} > + > +static inline u32 edma_readl(void __iomem *addr) > +{ > + u32 __v = (__force u32) __raw_readl(addr); > + > + __iormb(); > + return __v; > +} > + > +static inline void edma_writeb(u8 val, void __iomem *addr) > +{ > + writeb(val, addr); > +} > + > +static inline void edma_writew(u16 val, void __iomem *addr) > +{ > + __iowmb(); > + __raw_writew((__force u16) val, addr); > +} > + > +static inline void edma_writel(u32 val, void __iomem *addr) > +{ > + __iowmb(); > + __raw_writel((__force u32) val, addr); > +} > + > +static inline struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan > *chan) > +{ > + return container_of(chan, struct fsl_edma_chan, vchan.chan); > +} > + > +static inline struct fsl_edma_desc *to_fsl_edma_desc(struct > virt_dma_desc *vd) > +{ > + return container_of(vd, struct fsl_edma_desc, vdesc); > +} > + > +static inline void fsl_edma_enable_request(struct fsl_edma_chan > *fsl_chan) > +{ > + void __iomem *addr = fsl_chan->edma->membase; > + u32 ch = fsl_chan->vchan.chan.chan_id; > + > + edma_writeb(EDMA_SEEI_SEEI(ch), addr + EDMA_SEEI); > + edma_writeb(ch, addr + EDMA_SERQ); > +} > + > +static inline void fsl_edma_disable_request(struct fsl_edma_chan > *fsl_chan) > +{ > + void __iomem *addr = fsl_chan->edma->membase; > + u32 ch = fsl_chan->vchan.chan.chan_id; > + > + edma_writeb(ch, addr + EDMA_CERQ); > + edma_writeb(EDMA_CEEI_CEEI(ch), addr + EDMA_CEEI); > +} > + > +static inline void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan, > + unsigned int slot, bool enable) > +{ > + u32 ch = fsl_chan->vchan.chan.chan_id; > + void __iomem *muxaddr = fsl_chan->edma->muxbase[ch / DMAMUX_NR]; > + unsigned chans_per_mux, ch_off; > + > + chans_per_mux = fsl_chan->edma->n_chans / DMAMUX_NR; > + ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux; > + > + if (enable) > + edma_writeb(EDMAMUX_CHCFG_ENBL | EDMAMUX_CHCFG_SOURCE(slot), > + muxaddr + ch_off); > + else > + edma_writeb(EDMAMUX_CHCFG_DIS, muxaddr + ch_off); > +} > + > +static unsigned int fsl_edma_get_tcd_attr(enum dma_slave_buswidth > addr_width) > +{ > + switch (addr_width) { > + case 1: > + return EDMA_TCD_ATTR_SSIZE_8BIT | EDMA_TCD_ATTR_DSIZE_8BIT; > + case 2: > + return EDMA_TCD_ATTR_SSIZE_16BIT | EDMA_TCD_ATTR_DSIZE_16BIT; > + case 4: > + return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT; > + case 8: > + return EDMA_TCD_ATTR_SSIZE_64BIT | EDMA_TCD_ATTR_DSIZE_64BIT; > + default: > + return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT; > + } > +} > + > +static void fsl_edma_free_desc(struct virt_dma_desc *vdesc) > +{ > + struct fsl_edma_desc *fsl_desc; > + int i; > + > + fsl_desc = to_fsl_edma_desc(vdesc); > + for (i = 0; i < fsl_desc->n_tcds; i++) > + dma_pool_free(fsl_desc->echan->tcd_pool, > + fsl_desc->tcd[i].vtcd, > + fsl_desc->tcd[i].ptcd); > + kfree(fsl_desc); > +} > + > +static int fsl_edma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, > + unsigned long arg) > +{ > + struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); > + struct dma_slave_config *cfg = (void *)arg; > + unsigned long flags; > + LIST_HEAD(head); > + > + switch (cmd) { > + case DMA_TERMINATE_ALL: > + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); > + fsl_edma_disable_request(fsl_chan); > + fsl_chan->edesc = NULL; > + vchan_get_all_descriptors(&fsl_chan->vchan, &head); > + spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); > + vchan_dma_desc_free_list(&fsl_chan->vchan, &head); > + return 0; > + > + case DMA_SLAVE_CONFIG: > + fsl_chan->fsc.dir = cfg->direction; > + if (cfg->direction == DMA_DEV_TO_MEM) { > + fsl_chan->fsc.dev_addr = cfg->src_addr; > + fsl_chan->fsc.addr_width = cfg->src_addr_width; > + fsl_chan->fsc.burst = cfg->src_maxburst; > + fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg- > >src_addr_width); > + } else if (cfg->direction == DMA_MEM_TO_DEV) { > + fsl_chan->fsc.dev_addr = cfg->dst_addr; > + fsl_chan->fsc.addr_width = cfg->dst_addr_width; > + fsl_chan->fsc.burst = cfg->dst_maxburst; > + fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg- > >dst_addr_width); > + } else { > + return -EINVAL; > + } > + return 0; > + > + case DMA_PAUSE: > + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); > + if (fsl_chan->edesc) { > + fsl_edma_disable_request(fsl_chan); > + fsl_chan->status = DMA_PAUSED; > + } > + spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); > + return 0; > + > + case DMA_RESUME: > + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); > + if (fsl_chan->edesc) { > + fsl_edma_enable_request(fsl_chan); > + fsl_chan->status = DMA_IN_PROGRESS; > + } > + spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); > + return 0; > + > + default: > + return -ENXIO; > + } > +} > + > +static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan, > + struct virt_dma_desc *vdesc, bool in_progress) > +{ > + struct fsl_edma_desc *edesc = fsl_chan->edesc; > + void __iomem *addr = fsl_chan->edma->membase; > + u32 ch = fsl_chan->vchan.chan.chan_id; > + enum dma_transfer_direction dir = fsl_chan->fsc.dir; > + dma_addr_t cur_addr, dma_addr; > + size_t len, size; > + int i; > + > + /* calculate the total size in this desc */ > + for (len = i = 0; i < fsl_chan->edesc->n_tcds; i++) > + len += edesc->tcd[i].vtcd->nbytes * edesc->tcd[i].vtcd->biter; > + > + if (!in_progress) > + return len; > + > + if (dir == DMA_MEM_TO_DEV) > + cur_addr = EDMA_SWAP32(fsl_chan->edma, edma_readl(addr + > EDMA_TCD_SADDR(ch))); > + else > + cur_addr = EDMA_SWAP32(fsl_chan->edma, edma_readl(addr + > EDMA_TCD_DADDR(ch))); > + > + /* figure out the finished and calculate the residue */ > + for (i = 0; i < fsl_chan->edesc->n_tcds; i++) { > + size = edesc->tcd[i].vtcd->nbytes * edesc->tcd[i].vtcd->biter; > + if (dir == DMA_MEM_TO_DEV) > + dma_addr = edesc->tcd[i].vtcd->saddr; > + else > + dma_addr = edesc->tcd[i].vtcd->daddr; > + > + len -= size; > + if (cur_addr > dma_addr && cur_addr < dma_addr + size) { > + len += dma_addr + size - cur_addr; > + break; > + } > + } > + > + return len; > +} > + > +static enum dma_status fsl_edma_tx_status(struct dma_chan *chan, > + dma_cookie_t cookie, struct dma_tx_state *txstate) > +{ > + struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); > + struct virt_dma_desc *vdesc; > + enum dma_status status; > + unsigned long flags; > + > + status = dma_cookie_status(chan, cookie, txstate); > + if (status == DMA_COMPLETE) > + return status; > + > + if (!txstate) > + return fsl_chan->status; > + > + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); > + vdesc = vchan_find_desc(&fsl_chan->vchan, cookie); > + if (fsl_chan->edesc && cookie == fsl_chan->edesc->vdesc.tx.cookie) > + txstate->residue = fsl_edma_desc_residue(fsl_chan, vdesc, > true); > + else if (vdesc) > + txstate->residue = fsl_edma_desc_residue(fsl_chan, vdesc, > false); > + else > + txstate->residue = 0; > + > + spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); > + > + return fsl_chan->status; > +} > + > +static void fsl_edma_set_tcd_params(struct fsl_edma_chan *fsl_chan, > + u32 src, u32 dst, u16 attr, u16 soff, u32 nbytes, > + u32 slast, u16 citer, u16 biter, u32 doff, u32 dlast_sga, > + u16 csr) > +{ > + void __iomem *addr = fsl_chan->edma->membase; > + u32 ch = fsl_chan->vchan.chan.chan_id; > + > + edma_writew(0, addr + EDMA_TCD_CSR(ch)); > + edma_writel(src, addr + EDMA_TCD_SADDR(ch)); > + edma_writel(dst, addr + EDMA_TCD_DADDR(ch)); > + edma_writew(attr, addr + EDMA_TCD_ATTR(ch)); > + edma_writew(soff, addr + EDMA_TCD_SOFF(ch)); > + edma_writel(nbytes, addr + EDMA_TCD_NBYTES(ch)); > + edma_writel(slast, addr + EDMA_TCD_SLAST(ch)); > + edma_writew(citer, addr + EDMA_TCD_CITER(ch)); > + edma_writew(biter, addr + EDMA_TCD_BITER(ch)); > + edma_writew(doff, addr + EDMA_TCD_DOFF(ch)); > + edma_writel(dlast_sga, addr + EDMA_TCD_DLAST_SGA(ch)); > + edma_writew(csr, addr + EDMA_TCD_CSR(ch)); > +} > + > +static void fill_tcd_params(struct fsl_edma_engine *edma, > + struct fsl_edma_hw_tcd *tcd, u32 src, u32 dst, > + u16 attr, u16 soff, u32 nbytes, u32 slast, u16 citer, > + u16 biter, u16 doff, u32 dlast_sga, bool major_int, > + bool disable_req, bool enable_sg) > +{ > + u16 csr = 0; > + > + tcd->saddr = EDMA_SWAP32(edma, src); > + tcd->daddr = EDMA_SWAP32(edma, dst); > + tcd->attr = EDMA_SWAP16(edma, attr); > + tcd->soff = EDMA_SWAP16(edma, EDMA_TCD_SOFF_SOFF(soff)); > + tcd->nbytes = EDMA_SWAP32(edma, EDMA_TCD_NBYTES_NBYTES(nbytes)); > + tcd->slast = EDMA_SWAP32(edma, EDMA_TCD_SLAST_SLAST(slast)); > + tcd->citer = EDMA_SWAP16(edma, EDMA_TCD_CITER_CITER(citer)); > + tcd->doff = EDMA_SWAP16(edma, EDMA_TCD_DOFF_DOFF(doff)); > + tcd->dlast_sga = EDMA_SWAP32(edma, > EDMA_TCD_DLAST_SGA_DLAST_SGA(dlast_sga)); > + tcd->biter = EDMA_SWAP16(edma, EDMA_TCD_BITER_BITER(biter)); > + if (major_int) > + csr |= EDMA_TCD_CSR_INT_MAJOR; > + > + if (disable_req) > + csr |= EDMA_TCD_CSR_D_REQ; > + > + if (enable_sg) > + csr |= EDMA_TCD_CSR_E_SG; > + tcd->csr = EDMA_SWAP16(edma, csr); > +} > + > +static struct fsl_edma_desc *fsl_edma_alloc_desc(struct fsl_edma_chan > *fsl_chan, > + int sg_len) > +{ > + struct fsl_edma_desc *fsl_desc; > + int i; > + > + fsl_desc = kzalloc(sizeof(*fsl_desc) + sizeof(struct > fsl_edma_sw_tcd) * sg_len, > + GFP_NOWAIT); > + if (!fsl_desc) > + return NULL; > + > + fsl_desc->echan = fsl_chan; > + fsl_desc->n_tcds = sg_len; > + for (i = 0; i < sg_len; i++) { > + fsl_desc->tcd[i].vtcd = dma_pool_alloc(fsl_chan->tcd_pool, > + GFP_NOWAIT, &fsl_desc->tcd[i].ptcd); > + if (!fsl_desc->tcd[i].vtcd) > + goto free_on_err; > + } > + return fsl_desc; > + > +free_on_err: > + while (--i >= 0) > + dma_pool_free(fsl_chan->tcd_pool, fsl_desc->tcd[i].vtcd, > + fsl_desc->tcd[i].ptcd); > + kfree(fsl_desc); > + return NULL; > +} > + > +static struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic( > + struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, > + size_t period_len, enum dma_transfer_direction direction, > + unsigned long flags, void *context) > +{ > + struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); > + struct fsl_edma_desc *fsl_desc; > + dma_addr_t dma_buf_next; > + int sg_len, i; > + u32 src_addr, dst_addr, last_sg, nbytes; > + u16 soff, doff, iter; > + > + if (!is_slave_direction(fsl_chan->fsc.dir)) > + return NULL; > + > + sg_len = buf_len / period_len; > + fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len); > + if (!fsl_desc) > + return NULL; > + fsl_desc->iscyclic = true; > + > + dma_buf_next = dma_addr; > + nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst; > + iter = period_len / nbytes; > + for (i = 0; i < sg_len; i++) { > + if (dma_buf_next >= dma_addr + buf_len) > + dma_buf_next = dma_addr; > + > + /* get next sg's physical address */ > + last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd; > + > + if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) { > + src_addr = dma_buf_next; > + dst_addr = fsl_chan->fsc.dev_addr; > + soff = fsl_chan->fsc.addr_width; > + doff = 0; > + } else { > + src_addr = fsl_chan->fsc.dev_addr; > + dst_addr = dma_buf_next; > + soff = 0; > + doff = fsl_chan->fsc.addr_width; > + } > + > + fill_tcd_params(fsl_chan->edma, fsl_desc->tcd[i].vtcd, > src_addr, > + dst_addr, fsl_chan->fsc.attr, soff, nbytes, 0, > + iter, iter, doff, last_sg, true, false, true); > + dma_buf_next += period_len; > + } > + > + return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags); > +} > + > +static struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg( > + struct dma_chan *chan, struct scatterlist *sgl, > + unsigned int sg_len, enum dma_transfer_direction direction, > + unsigned long flags, void *context) > +{ > + struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); > + struct fsl_edma_desc *fsl_desc; > + struct scatterlist *sg; > + u32 src_addr, dst_addr, last_sg, nbytes; > + u16 soff, doff, iter; > + int i; > + > + if (!is_slave_direction(fsl_chan->fsc.dir)) > + return NULL; > + > + fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len); > + if (!fsl_desc) > + return NULL; > + fsl_desc->iscyclic = false; > + > + nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst; > + for_each_sg(sgl, sg, sg_len, i) { > + /* get next sg's physical address */ > + last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd; > + > + if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) { > + src_addr = sg_dma_address(sg); > + dst_addr = fsl_chan->fsc.dev_addr; > + soff = fsl_chan->fsc.addr_width; > + doff = 0; > + } else { > + src_addr = fsl_chan->fsc.dev_addr; > + dst_addr = sg_dma_address(sg); > + soff = 0; > + doff = fsl_chan->fsc.addr_width; > + } > + > + iter = sg_dma_len(sg) / nbytes; > + if (i < sg_len - 1) { > + last_sg = fsl_desc->tcd[(i + 1)].ptcd; > + fill_tcd_params(fsl_chan->edma, fsl_desc->tcd[i].vtcd, > + src_addr, dst_addr, fsl_chan->fsc.attr, > + soff, nbytes, 0, iter, iter, doff, > last_sg, > + false, false, true); > + } else { > + last_sg = 0; > + fill_tcd_params(fsl_chan->edma, fsl_desc->tcd[i].vtcd, > + src_addr, dst_addr, fsl_chan->fsc.attr, > + soff, nbytes, 0, iter, iter, doff, > last_sg, > + true, true, false); > + } > + } > + > + return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags); > +} > + > +static void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan) > +{ > + struct fsl_edma_hw_tcd *tcd; > + struct virt_dma_desc *vdesc; > + > + vdesc = vchan_next_desc(&fsl_chan->vchan); > + if (!vdesc) > + return; > + fsl_chan->edesc = to_fsl_edma_desc(vdesc); > + tcd = fsl_chan->edesc->tcd[0].vtcd; > + fsl_edma_set_tcd_params(fsl_chan, tcd->saddr, tcd->daddr, tcd->attr, > + tcd->soff, tcd->nbytes, tcd->slast, tcd->citer, > + tcd->biter, tcd->doff, tcd->dlast_sga, tcd->csr); > + fsl_edma_enable_request(fsl_chan); > + fsl_chan->status = DMA_IN_PROGRESS; > +} > + > +static irqreturn_t fsl_edma_tx_handler(int irq, void *dev_id) > +{ > + struct fsl_edma_engine *fsl_edma = dev_id; > + unsigned int intr, ch; > + void __iomem *base_addr; > + struct fsl_edma_chan *fsl_chan; > + > + base_addr = fsl_edma->membase; > + > + intr = EDMA_SWAP32(fsl_edma, edma_readl(base_addr + EDMA_INTR)); > + if (!intr) > + return IRQ_NONE; > + > + for (ch = 0; ch < fsl_edma->n_chans; ch++) { > + if (intr & (0x1 << ch)) { > + edma_writeb(EDMA_CINT_CINT(ch), base_addr + EDMA_CINT); > + > + fsl_chan = &fsl_edma->chans[ch]; > + > + spin_lock(&fsl_chan->vchan.lock); > + if (!fsl_chan->edesc->iscyclic) { > + list_del(&fsl_chan->edesc->vdesc.node); > + vchan_cookie_complete(&fsl_chan->edesc->vdesc); > + fsl_chan->edesc = NULL; > + fsl_chan->status = DMA_COMPLETE; > + } else { > + vchan_cyclic_callback(&fsl_chan->edesc->vdesc); > + } > + > + if (!fsl_chan->edesc) > + fsl_edma_xfer_desc(fsl_chan); > + > + spin_unlock(&fsl_chan->vchan.lock); > + } > + } > + return IRQ_HANDLED; > +} > + > +static irqreturn_t fsl_edma_err_handler(int irq, void *dev_id) > +{ > + struct fsl_edma_engine *fsl_edma = dev_id; > + unsigned int err, ch; > + > + err = EDMA_SWAP32(fsl_edma, edma_readl(fsl_edma->membase + > EDMA_ERR)); > + if (!err) > + return IRQ_NONE; > + > + for (ch = 0; ch < fsl_edma->n_chans; ch++) { > + if (err & (0x1 << ch)) { > + fsl_edma_disable_request(&fsl_edma->chans[ch]); > + edma_writeb(EDMA_CERR_CERR(ch), fsl_edma->membase + > EDMA_CERR); > + fsl_edma->chans[ch].status = DMA_ERROR; > + } > + } > + return IRQ_HANDLED; > +} > + > +static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id) > +{ > + if (fsl_edma_tx_handler(irq, dev_id) == IRQ_HANDLED) > + return IRQ_HANDLED; > + > + return fsl_edma_err_handler(irq, dev_id); > +} > + > +static void fsl_edma_issue_pending(struct dma_chan *chan) > +{ > + struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); > + unsigned long flags; > + > + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); > + > + if (vchan_issue_pending(&fsl_chan->vchan) && !fsl_chan->edesc) > + fsl_edma_xfer_desc(fsl_chan); > + > + spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); > +} > + > +static bool fsl_edma_filter_fn(struct dma_chan *chan, void *mux) > +{ > + return (chan->chan_id / DMAMUX_NR) == (u32)mux; > +} > + > +static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec, > + struct of_dma *ofdma) > +{ > + struct dma_chan *chan; > + dma_cap_mask_t mask; > + > + if (dma_spec->args_count != 2) > + return NULL; > + > + dma_cap_zero(mask); > + dma_cap_set(DMA_SLAVE, mask); > + dma_cap_set(DMA_CYCLIC, mask); > + chan = dma_request_channel(mask, fsl_edma_filter_fn, (void > *)dma_spec->args[0]); > + if (chan) > + fsl_edma_chan_mux(to_fsl_edma_chan(chan), dma_spec->args[1], > true); > + return chan; > +} > + > +static int fsl_edma_alloc_chan_resources(struct dma_chan *chan) > +{ > + struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); > + > + fsl_chan->tcd_pool = dma_pool_create("tcd_pool", chan->device->dev, > + sizeof(struct fsl_edma_hw_tcd), > + 32, 0); > + return 0; > +} > + > +static void fsl_edma_free_chan_resources(struct dma_chan *chan) > +{ > + struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); > + unsigned long flags; > + LIST_HEAD(head); > + > + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); > + fsl_edma_disable_request(fsl_chan); > + fsl_edma_chan_mux(fsl_chan, 0, false); > + fsl_chan->edesc = NULL; > + vchan_get_all_descriptors(&fsl_chan->vchan, &head); > + spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); > + > + vchan_dma_desc_free_list(&fsl_chan->vchan, &head); > + dma_pool_destroy(fsl_chan->tcd_pool); > + fsl_chan->tcd_pool = NULL; > +} > + > +static int > +fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine > *fsl_edma) > +{ > + int ret; > + > + fsl_edma->txirq = platform_get_irq_byname(pdev, "edma-tx"); > + if (fsl_edma->txirq < 0) { > + dev_err(&pdev->dev, "Can't get edma-tx irq.\n"); > + return fsl_edma->txirq; > + } > + > + fsl_edma->errirq = platform_get_irq_byname(pdev, "edma-err"); > + if (fsl_edma->errirq < 0) { > + dev_err(&pdev->dev, "Can't get edma-err irq.\n"); > + return fsl_edma->errirq; > + } > + > + if (fsl_edma->txirq == fsl_edma->errirq) { > + ret = devm_request_irq(&pdev->dev, fsl_edma->txirq, > + fsl_edma_irq_handler, 0, "eDMA", fsl_edma); > + if (ret) { > + dev_err(&pdev->dev, "Can't register eDMA IRQ.\n"); > + return ret; > + } > + } else { > + ret = devm_request_irq(&pdev->dev, fsl_edma->txirq, > + fsl_edma_tx_handler, 0, "eDMA tx", fsl_edma); > + if (ret) { > + dev_err(&pdev->dev, "Can't register eDMA tx IRQ.\n"); > + return ret; > + } > + > + ret = devm_request_irq(&pdev->dev, fsl_edma->errirq, > + fsl_edma_err_handler, 0, "eDMA err", fsl_edma); > + if (ret) { > + dev_err(&pdev->dev, "Can't register eDMA err IRQ.\n"); > + return ret; > + } > + } > + > + return 0; > +} > + > +static int fsl_edma_probe(struct platform_device *pdev) > +{ > + struct device_node *np = pdev->dev.of_node; > + struct fsl_edma_engine *fsl_edma; > + struct fsl_edma_chan *fsl_chan; > + struct resource *res; > + int len, chans; > + int ret, i; > + > + ret = of_property_read_u32(np, "dma-channels", &chans); > + if (ret) { > + dev_err(&pdev->dev, "Can't get dma-channels.\n"); > + return ret; > + } > + > + len = sizeof(*fsl_edma) + sizeof(*fsl_chan) * chans; > + fsl_edma = devm_kzalloc(&pdev->dev, len, GFP_KERNEL); > + if (!fsl_edma) > + return -ENOMEM; > + > + fsl_edma->n_chans = chans; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + fsl_edma->membase = devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(fsl_edma->membase)) > + return PTR_ERR(fsl_edma->membase); > + > + for (i = 0; i < DMAMUX_NR; i++) { > + char clkname[32]; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 1 + i); > + fsl_edma->muxbase[i] = devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(fsl_edma->muxbase[i])) > + return PTR_ERR(fsl_edma->muxbase[i]); > + > + sprintf(clkname, "dmamux%d", i); > + fsl_edma->muxclk[i] = of_clk_get(np, i); > + fsl_edma->muxclk[i] = devm_clk_get(&pdev->dev, clkname); > + if (IS_ERR(fsl_edma->muxclk[i])) { > + dev_err(&pdev->dev, "Missing DMAMUX block clock.\n"); > + return PTR_ERR(fsl_edma->muxclk[i]); > + } > + > + ret = clk_prepare_enable(fsl_edma->muxclk[i]); > + if (ret) { > + dev_err(&pdev->dev, "DMAMUX clk block failed.\n"); > + return ret; > + } > + > + } > + > + ret = fsl_edma_irq_init(pdev, fsl_edma); > + if (ret) > + return ret; > + > + fsl_edma->big_endian = of_property_read_bool(np, "big-endian"); > + > + INIT_LIST_HEAD(&fsl_edma->dma_dev.channels); > + for (i = 0; i < fsl_edma->n_chans; i++) { > + struct fsl_edma_chan *fsl_chan = &fsl_edma->chans[i]; > + > + fsl_chan->edma = fsl_edma; > + > + fsl_chan->vchan.desc_free = fsl_edma_free_desc; > + vchan_init(&fsl_chan->vchan, &fsl_edma->dma_dev); > + > + edma_writew(0x0, fsl_edma->membase + EDMA_TCD_CSR(i)); > + fsl_edma_chan_mux(fsl_chan, 0, false); > + } > + > + dma_cap_set(DMA_SLAVE, fsl_edma->dma_dev.cap_mask); > + dma_cap_set(DMA_CYCLIC, fsl_edma->dma_dev.cap_mask); > + > + fsl_edma->dma_dev.dev = &pdev->dev; > + fsl_edma->dma_dev.device_alloc_chan_resources > + = fsl_edma_alloc_chan_resources; > + fsl_edma->dma_dev.device_free_chan_resources > + = fsl_edma_free_chan_resources; > + fsl_edma->dma_dev.device_tx_status = fsl_edma_tx_status; > + fsl_edma->dma_dev.device_prep_slave_sg = fsl_edma_prep_slave_sg; > + fsl_edma->dma_dev.device_prep_dma_cyclic = fsl_edma_prep_dma_cyclic; > + fsl_edma->dma_dev.device_control = fsl_edma_control; > + fsl_edma->dma_dev.device_issue_pending = fsl_edma_issue_pending; > + > + platform_set_drvdata(pdev, fsl_edma); > + > + ret = dma_async_device_register(&fsl_edma->dma_dev); > + if (ret) { > + dev_err(&pdev->dev, "Can't register Freescale eDMA > engine.\n"); > + return ret; > + } > + > + ret = of_dma_controller_register(np, fsl_edma_xlate, fsl_edma); > + if (ret) { > + dev_err(&pdev->dev, "Can't register Freescale eDMA > of_dma.\n"); > + dma_async_device_unregister(&fsl_edma->dma_dev); > + return ret; > + } > + > + /* enable round robin arbitration */ > + edma_writel(EDMA_SWAP32(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA), > + fsl_edma->membase + EDMA_CR); > + > + return 0; > +} > + > +static int fsl_edma_remove(struct platform_device *pdev) > +{ > + struct device_node *np = pdev->dev.of_node; > + struct fsl_edma_engine *fsl_edma = platform_get_drvdata(pdev); > + int i; > + > + of_dma_controller_free(np); > + dma_async_device_unregister(&fsl_edma->dma_dev); > + > + for (i = 0; i < DMAMUX_NR; i++) > + clk_disable_unprepare(fsl_edma->muxclk[i]); > + > + return 0; > +} > + > +static const struct of_device_id fsl_edma_dt_ids[] = { > + { .compatible = "fsl,vf610-edma", }, > + { /* sentinel */ } > +}; > +MODULE_DEVICE_TABLE(of, fsl_edma_dt_ids); > + > +static struct platform_driver fsl_edma_driver = { > + .driver = { > + .name = "fsl-edma", > + .owner = THIS_MODULE, > + .of_match_table = fsl_edma_dt_ids, > + }, > + .probe = fsl_edma_probe, > + .remove = fsl_edma_remove, > +}; > + > +module_platform_driver(fsl_edma_driver); > + > +MODULE_ALIAS("platform:fsl-edma"); > +MODULE_DESCRIPTION("Freescale eDMA engine driver"); > +MODULE_LICENSE("GPL v2"); > -- > 1.8.0 >
