Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752557Ab3HPHCV (ORCPT ); Fri, 16 Aug 2013 03:02:21 -0400 Received: from va3ehsobe002.messaging.microsoft.com ([216.32.180.12]:16455 "EHLO va3outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752101Ab3HPHCQ (ORCPT ); Fri, 16 Aug 2013 03:02:16 -0400 X-Forefront-Antispam-Report: CIP:70.37.183.190;KIP:(null);UIP:(null);IPV:NLI;H:mail.freescale.net;RD:none;EFVD:NLI X-SpamScore: 3 X-BigFish: VS3(zzc8kzz1f42h208ch1ee6h1de0h1fdah2073h1202h1e76h1d1ah1d2ah1fc6hzz1de098h8275bh1de097hz2dh2a8h668h839hd24he5bhf0ah1288h12a5h12a9h12bdh12e5h137ah139eh13b6h1441h1504h1537h162dh1631h1758h1898h18e1h1946h19b5h1ad9h1b0ah1b2fh1fb3h1d0ch1d2eh1d3fh1dc1h1dfeh1dffh1e23h1fe8h1ff5h1155h) From: Jingchang Lu To: CC: , , , , Jingchang Lu , Alison Wang Subject: [PATCH v4 3/3] dma: Add Freescale eDMA engine driver support Date: Fri, 16 Aug 2013 14:07:54 +0800 Message-ID: <1376633274-17850-1-git-send-email-b35083@freescale.com> X-Mailer: git-send-email 1.8.0 MIME-Version: 1.0 Content-Type: text/plain X-OriginatorOrg: freescale.com X-FOPE-CONNECTOR: Id%0$Dn%*$RO%0$TLS%0$FQDN%$TlsDn% Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 29629 Lines: 1019 Add Freescale enhanced direct memory(eDMA) controller support. The eDMA controller deploys DMAMUXs routing DMA request sources(slot) to eDMA channels. This module can be found on Vybrid and LS-1 SoCs. Signed-off-by: Alison Wang Signed-off-by: Jingchang Lu --- changes in v4: using exact compatible string in binding document. changes in v3: handle all pending interrupt one time. add protect lock on dma transfer complete handling. change desc and tcd alloc flag to GFP_NOWAIT. add sanity check and error messages. changes in v2: using generic dma-channels property instead of fsl,dma-channel. rename the binding document to fsl-edma.txt. Documentation/devicetree/bindings/dma/fsl-edma.txt | 84 ++ drivers/dma/Kconfig | 10 + drivers/dma/Makefile | 1 + drivers/dma/fsl-edma.c | 855 +++++++++++++++++++++ 4 files changed, 950 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..95159da --- /dev/null +++ b/Documentation/devicetree/bindings/dma/fsl-edma.txt @@ -0,0 +1,84 @@ +* Freescale enhanced direct memory access(eDMA) Controller + +The eDMA engine deploys DMAMUXs routing request sources(slot) to +eDMA controller channels. + +* eDMA Controller +Required properties: +- compatible : + - "fsl,vf610-edma" for eDMA used similar to that on Vybrid vf610 SoC +- reg : Should contain eDMA registers location and length +- interrupts : Should contain eDMA interrupt +- interrupt-names : Should be "edma-tx" for tx interrupt and + "edma-err" for err interrupt +- #dma-cells : Must be <2>. + The first cell specifies the DMAMUX ID. Specific request source + can only be routed by specific DMAMUXs. + the second cell specifies the request source(slot) ID. + See include/dt-bindings/dma/-edma.h for all the supported + request source IDs. +- dma-channels : Number of channels supported by the controller +- fsl,dma-mux : Phandle of the DMAMUXs deployed by the controller + + +* DMAMUX +Required properties: +- reg : Should contain DMAMUX registers location and length +- fsl,dmamux-id : DMAMUX ID. DMAMUX IDs are unique in each eDMA controller. + inside one eDMA controller, specific request source can only be routed by + one of its DMAMUXs. + However Specific request source may be routed to different eDMA controller, + thus all the DMAMUXs sharing a the same request sources have the same ID. +- clocks : Phandle of the clock used by the DMAMUX +- clock-names : The clock names + +Below is the eDMA controller and DMAMUX association, and DMAMUX IDs assignment +On Vybrid vf610 SoC, DMAMUX0 and DMAMU3 share the same request source group, +and DMAMUX1 and DMAMU2 share the same request source group. + +eDMA controller DMAMUXs DMAMUX ID +------------------------------------------------- +eDMA0 DMAMUX0 0 + DMAMUX1 1 + +eDMA1 DMAMUX2 1 + DMAMUX3 0 + +Examples: + +edma0: edma@40018000 { + #dma-cells = <2>; + compatible = "fsl,vf610-edma"; + reg = <0x40018000 0x2000>; + interrupts = <0 8 0x04>, <0 9 0x04>; + interrupt-names = "edma-tx", "edma-err"; + dma-channels = <32>; + fsl,edma-mux = <&dmamux0>, <&dmamux1>; +}; + +dmamux0: dmamux@40024000 { + reg = <0x40024000 0x1000>; + fsl,dmamux-id = <0>; + clocks = <&clks VF610_CLK_DMAMUX0>; + clock-names = "dmamux"; +}; + + +* DMA clients +DMA client drivers that uses the DMA function must use the format described +in the dma.txt file, using a three-cell specifier for each channel: a phandle +plus two integer cells as described above. + +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 0 VF610_EDMA_MUXID0_SAI2_TX>, + <&edma0 0 VF610_EDMA_MUXID0_SAI2_RX>; + status = "disabled"; +}; diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index 6825957..f9a6e06 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -300,6 +300,16 @@ config DMA_JZ4740 select DMA_ENGINE select DMA_VIRTUAL_CHANNELS +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 managing route + between request sources(slot) and 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 5e0f2ef..fcbbac9 100644 --- a/drivers/dma/Makefile +++ b/drivers/dma/Makefile @@ -39,3 +39,4 @@ obj-$(CONFIG_MMP_TDMA) += mmp_tdma.o obj-$(CONFIG_DMA_OMAP) += omap-dma.o obj-$(CONFIG_MMP_PDMA) += mmp_pdma.o obj-$(CONFIG_DMA_JZ4740) += dma-jz4740.o +obj-$(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..5104e5e --- /dev/null +++ b/drivers/dma/fsl-edma.c @@ -0,0 +1,855 @@ +/* + * drivers/dma/fsl-edma.c + * + * Copyright 2013 Freescale Semiconductor, Inc. + * + * Driver for the Freescale eDMA engine with DMAMUXs managing route between + * request sources(slot) and eDMA engine channels, this module 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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_CITER_MASK 0x7FFF +#define EDMA_TCD_BITER_MASK 0x7FFF + +#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) + +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_dmamux { + void __iomem *membase; + struct clk *clk; + u32 mux_id; +}; + +struct fsl_edma_chan { + struct virt_dma_chan vchan; + enum dma_status status; + struct fsl_edma_engine *edma; + struct fsl_edma_dmamux *edmamux; + struct fsl_edma_desc *edesc; + + u32 slot_id; + 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_irq { + int txirq; + int errirq; +}; + +struct fsl_edma_engine { + struct dma_device dma_dev; + void __iomem *membase; + u32 n_chans; + u32 n_muxes; + struct fsl_edma_dmamux *edmamux; + struct fsl_edma_irq edmairq; + struct fsl_edma_chan chans[]; +}; + +struct fsl_edma_filter_param { + int mux_id; + int slot_id; +}; + +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; + + writeb(EDMA_SEEI_SEEI(ch), addr + EDMA_SEEI); + 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; + + writeb(ch, addr + EDMA_CERQ); + writeb(EDMA_CEEI_CEEI(ch), addr + EDMA_CEEI); +} + +static +void fsl_edmamux_config_chan(struct fsl_edma_chan *fsl_chan, unsigned char val) +{ + void __iomem *mux_addr = fsl_chan->edmamux->membase; + unsigned chans_per_mux, ch; + + chans_per_mux = fsl_chan->edma->n_chans / fsl_chan->edma->n_muxes; + ch = fsl_chan->vchan.chan.chan_id % chans_per_mux; + + writeb(val, mux_addr + ch); +} + +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; + + switch (cmd) { + case DMA_TERMINATE_ALL: + fsl_edma_disable_request(fsl_chan); + fsl_chan->edesc = NULL; + vchan_free_chan_resources(&fsl_chan->vchan); + 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; + + default: + return -ENXIO; + } +} + +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); + + if (fsl_chan->status == DMA_ERROR) + return DMA_ERROR; + + return dma_cookie_status(chan, cookie, txstate); +} + +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; + + writew(0, addr + EDMA_TCD_CSR(ch)); + writel(src, addr + EDMA_TCD_SADDR(ch)); + writel(dst, addr + EDMA_TCD_DADDR(ch)); + writew(attr, addr + EDMA_TCD_ATTR(ch)); + writew(EDMA_TCD_SOFF_SOFF(soff), addr + EDMA_TCD_SOFF(ch)); + writel(EDMA_TCD_NBYTES_NBYTES(nbytes), addr + EDMA_TCD_NBYTES(ch)); + writel(EDMA_TCD_SLAST_SLAST(slast), addr + EDMA_TCD_SLAST(ch)); + writew(EDMA_TCD_CITER_CITER(citer), addr + EDMA_TCD_CITER(ch)); + writew(EDMA_TCD_BITER_BITER(biter), addr + EDMA_TCD_BITER(ch)); + writew(EDMA_TCD_DOFF_DOFF(doff), addr + EDMA_TCD_DOFF(ch)); + writel(EDMA_TCD_DLAST_SGA_DLAST_SGA(dlast_sga), + addr + EDMA_TCD_DLAST_SGA(ch)); + writew(csr, addr + EDMA_TCD_CSR(ch)); +} + +static void fill_tcd_params(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) +{ + tcd->saddr = src; + tcd->attr = attr; + tcd->soff = soff; + tcd->nbytes = nbytes; + tcd->slast = slast; + tcd->daddr = dst; + tcd->citer = citer; + tcd->doff = doff; + tcd->dlast_sga = dlast_sga; + tcd->biter = biter; + tcd->csr = 0; + if (major_int) + tcd->csr |= EDMA_TCD_CSR_INT_MAJOR; + + if (disable_req) + tcd->csr |= EDMA_TCD_CSR_D_REQ; + + if (enable_sg) + tcd->csr |= EDMA_TCD_CSR_E_SG; +} + +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 (!fsl_chan->fsc.dir == DMA_MEM_TO_DEV && + !fsl_chan->fsc.dir == DMA_DEV_TO_MEM) + 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_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 (!fsl_chan->fsc.dir == DMA_MEM_TO_DEV && + !fsl_chan->fsc.dir == DMA_DEV_TO_MEM) + 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_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_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_irq_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 = readl(base_addr + EDMA_INTR); + if (!intr) + return IRQ_NONE; + + for (ch = 0; ch < fsl_edma->n_chans; ch++) { + if (intr & (0x1 << ch)) { + 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_SUCCESS; + } 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 = 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]); + writeb(EDMA_CERR_CERR(ch), fsl_edma->membase + EDMA_CERR); + fsl_edma->chans[ch].status = DMA_ERROR; + } + } + return IRQ_HANDLED; +} + + +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 *fn_param) +{ + struct fsl_edma_filter_param *fparam = fn_param; + struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); + + if (fsl_chan->edmamux->mux_id != fparam->mux_id) + return false; + + fsl_chan->slot_id = fparam->slot_id; + chan->private = fn_param; + return true; +} + +static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + dma_cap_mask_t mask; + struct fsl_edma_filter_param fparam; + + if (dma_spec->args_count != 2) + return NULL; + + fparam.mux_id = dma_spec->args[0]; + fparam.slot_id = dma_spec->args[1]; + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + dma_cap_set(DMA_CYCLIC, mask); + return dma_request_channel(mask, fsl_edma_filter_fn, (void *)&fparam); +} + +static int fsl_edma_alloc_chan_resources(struct dma_chan *chan) +{ + struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); + struct fsl_edma_filter_param *data = chan->private; + unsigned char val; + + val = EDMAMUX_CHCFG_ENBL | EDMAMUX_CHCFG_SOURCE(data->slot_id); + fsl_edmamux_config_chan(fsl_chan, val); + + 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); + + fsl_edma_disable_request(fsl_chan); + fsl_edmamux_config_chan(fsl_chan, EDMAMUX_CHCFG_DIS); + fsl_chan->edesc = NULL; + vchan_free_chan_resources(&fsl_chan->vchan); + dma_pool_destroy(fsl_chan->tcd_pool); + fsl_chan->tcd_pool = NULL; +} + +static int +fsl_init_edmamux(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma) +{ + struct device_node *np = pdev->dev.of_node; + struct fsl_edma_dmamux *fsl_edmamux; + struct device_node *phandle; + const void *prop; + struct resource res; + int len, n_muxes, chans_per_mux, ch_off; + int i, j; + int ret; + + prop = of_get_property(np, "fsl,dma-mux", &len); + if (!prop) { + dev_err(&pdev->dev, "Can't get DMAMUX.\n"); + return -EINVAL; + } + + n_muxes = len / sizeof(u32); + chans_per_mux = fsl_edma->n_chans / n_muxes; + fsl_edmamux = devm_kzalloc(&pdev->dev, + sizeof(struct fsl_edma_dmamux) * n_muxes, GFP_KERNEL); + if (!fsl_edmamux) + return -ENOMEM; + + fsl_edma->n_muxes = 0; + fsl_edma->edmamux = fsl_edmamux; + for (i = 0; i < n_muxes; i++) { + phandle = of_parse_phandle(np, "fsl,dma-mux", i); + ret = of_address_to_resource(phandle, 0, &res); + if (ret) + return ret; + fsl_edmamux->membase = devm_ioremap_resource(&pdev->dev, &res); + if (IS_ERR(fsl_edmamux->membase)) + return PTR_ERR(fsl_edmamux->membase); + + fsl_edmamux->clk = of_clk_get(phandle, 0); + if (IS_ERR(fsl_edmamux->clk)) { + dev_err(&pdev->dev, "Missing DMAMUX clock.\n"); + return PTR_ERR(fsl_edmamux->clk); + } + + ret = clk_prepare_enable(fsl_edmamux->clk); + if (ret) { + dev_err(&pdev->dev, "DMAMUX clk enable failed.\n"); + return ret; + } + + ret = of_property_read_u32_index(phandle, "fsl,dmamux-id", 0, + &fsl_edmamux->mux_id); + if (ret) { + dev_err(&pdev->dev, "Can't get dmamux-id.\n"); + return ret; + } + + ch_off = fsl_edma->n_muxes * chans_per_mux; + for (j = 0; j < chans_per_mux; j++) + fsl_edma->chans[ch_off + j].edmamux = fsl_edmamux; + + fsl_edmamux++; + fsl_edma->n_muxes++; + } + return 0; +} + +static int +fsl_edma_init_irq(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma) +{ + int ret; + + fsl_edma->edmairq.txirq = platform_get_irq_byname(pdev, "edma-tx"); + if (fsl_edma->edmairq.txirq < 0) { + dev_err(&pdev->dev, "Can't get edma-tx irq.\n"); + return fsl_edma->edmairq.txirq; + } + + ret = devm_request_irq(&pdev->dev, fsl_edma->edmairq.txirq, + fsl_edma_irq_handler, IRQF_SHARED, "eDMA tx", fsl_edma); + if (ret) { + dev_err(&pdev->dev, "Can't register eDMA tx IRQ.\n"); + return ret; + } + + fsl_edma->edmairq.errirq = platform_get_irq_byname(pdev, "edma-err"); + if (fsl_edma->edmairq.errirq < 0) { + dev_err(&pdev->dev, "Can't get edma-err irq.\n"); + return fsl_edma->edmairq.errirq; + } + + ret = devm_request_irq(&pdev->dev, fsl_edma->edmairq.errirq, + fsl_edma_err_handler, IRQF_SHARED, "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_index(np, "dma-channels", 0, &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); + + ret = fsl_init_edmamux(pdev, fsl_edma); + if (ret) + return ret; + + ret = fsl_edma_init_irq(pdev, fsl_edma); + if (ret) + return ret; + + 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); + + writew(0x0, fsl_edma->membase + EDMA_TCD_CSR(i)); + fsl_edmamux_config_chan(fsl_chan, EDMAMUX_CHCFG_DIS); + } + + 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 */ + writel(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 < fsl_edma->n_muxes; i++) { + clk_disable_unprepare(fsl_edma->edmamux[i].clk); + clk_put(fsl_edma->edmamux[i].clk); + } + + 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/