drivers/dma/fsl-edma-common.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * Copyright 2013-2014 Freescale Semiconductor, Inc.
   4  * Copyright 2018 Angelo Dureghello <angelo@sysam.it>
   5  */
   6 #ifndef _FSL_EDMA_COMMON_H_
   7 #define _FSL_EDMA_COMMON_H_
   8
   9 #include <linux/dma-direction.h>
  10 #include <linux/platform_device.h>
  11 #include "virt-dma.h"
  12
  13 #define EDMA_CR_EDBG            BIT(1)
  14 #define EDMA_CR_ERCA            BIT(2)
  15 #define EDMA_CR_ERGA            BIT(3)
  16 #define EDMA_CR_HOE             BIT(4)
  17 #define EDMA_CR_HALT            BIT(5)
  18 #define EDMA_CR_CLM             BIT(6)
  19 #define EDMA_CR_EMLM            BIT(7)
  20 #define EDMA_CR_ECX             BIT(16)
  21 #define EDMA_CR_CX              BIT(17)
  22
  23 #define EDMA_SEEI_SEEI(x)       ((x) & GENMASK(4, 0))
  24 #define EDMA_CEEI_CEEI(x)       ((x) & GENMASK(4, 0))
  25 #define EDMA_CINT_CINT(x)       ((x) & GENMASK(4, 0))
  26 #define EDMA_CERR_CERR(x)       ((x) & GENMASK(4, 0))
  27
  28 #define EDMA_TCD_ATTR_DSIZE(x)          (((x) & GENMASK(2, 0)))
  29 #define EDMA_TCD_ATTR_DMOD(x)           (((x) & GENMASK(4, 0)) << 3)
  30 #define EDMA_TCD_ATTR_SSIZE(x)          (((x) & GENMASK(2, 0)) << 8)
  31 #define EDMA_TCD_ATTR_SMOD(x)           (((x) & GENMASK(4, 0)) << 11)
  32 #define EDMA_TCD_ATTR_DSIZE_8BIT        0
  33 #define EDMA_TCD_ATTR_DSIZE_16BIT       BIT(0)
  34 #define EDMA_TCD_ATTR_DSIZE_32BIT       BIT(1)
  35 #define EDMA_TCD_ATTR_DSIZE_64BIT       (BIT(0) | BIT(1))
  36 #define EDMA_TCD_ATTR_DSIZE_32BYTE      (BIT(2) | BIT(0))
  37 #define EDMA_TCD_ATTR_SSIZE_8BIT        0
  38 #define EDMA_TCD_ATTR_SSIZE_16BIT       (EDMA_TCD_ATTR_DSIZE_16BIT << 8)
  39 #define EDMA_TCD_ATTR_SSIZE_32BIT       (EDMA_TCD_ATTR_DSIZE_32BIT << 8)
  40 #define EDMA_TCD_ATTR_SSIZE_64BIT       (EDMA_TCD_ATTR_DSIZE_64BIT << 8)
  41 #define EDMA_TCD_ATTR_SSIZE_32BYTE      (EDMA_TCD_ATTR_DSIZE_32BYTE << 8)
  42
  43 #define EDMA_TCD_CITER_CITER(x)         ((x) & GENMASK(14, 0))
  44 #define EDMA_TCD_BITER_BITER(x)         ((x) & GENMASK(14, 0))
  45
  46 #define EDMA_TCD_CSR_START              BIT(0)
  47 #define EDMA_TCD_CSR_INT_MAJOR          BIT(1)
  48 #define EDMA_TCD_CSR_INT_HALF           BIT(2)
  49 #define EDMA_TCD_CSR_D_REQ              BIT(3)
  50 #define EDMA_TCD_CSR_E_SG               BIT(4)
  51 #define EDMA_TCD_CSR_E_LINK             BIT(5)
  52 #define EDMA_TCD_CSR_ACTIVE             BIT(6)
  53 #define EDMA_TCD_CSR_DONE               BIT(7)
  54
  55 #define EDMAMUX_CHCFG_DIS               0x0
  56 #define EDMAMUX_CHCFG_ENBL              0x80
  57 #define EDMAMUX_CHCFG_SOURCE(n)         ((n) & 0x3F)
  58
  59 #define DMAMUX_NR       2
  60
  61 #define FSL_EDMA_BUSWIDTHS      (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
  62                                  BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
  63                                  BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
  64                                  BIT(DMA_SLAVE_BUSWIDTH_8_BYTES))
  65 enum fsl_edma_pm_state {
  66         RUNNING = 0,
  67         SUSPENDED,
  68 };
  69
  70 struct fsl_edma_hw_tcd {
  71         __le32  saddr;
  72         __le16  soff;
  73         __le16  attr;
  74         __le32  nbytes;
  75         __le32  slast;
  76         __le32  daddr;
  77         __le16  doff;
  78         __le16  citer;
  79         __le32  dlast_sga;
  80         __le16  csr;
  81         __le16  biter;
  82 };
  83
  84 /*
  85  * These are iomem pointers, for both v32 and v64.
  86  */
  87 struct edma_regs {
  88         void __iomem *cr;
  89         void __iomem *es;
  90         void __iomem *erqh;
  91         void __iomem *erql;     /* aka erq on v32 */
  92         void __iomem *eeih;
  93         void __iomem *eeil;     /* aka eei on v32 */
  94         void __iomem *seei;
  95         void __iomem *ceei;
  96         void __iomem *serq;
  97         void __iomem *cerq;
  98         void __iomem *cint;
  99         void __iomem *cerr;
 100         void __iomem *ssrt;
 101         void __iomem *cdne;
 102         void __iomem *inth;
 103         void __iomem *intl;
 104         void __iomem *errh;
 105         void __iomem *errl;
 106         struct fsl_edma_hw_tcd __iomem *tcd;
 107 };
 108
 109 struct fsl_edma_sw_tcd {
 110         dma_addr_t                      ptcd;
 111         struct fsl_edma_hw_tcd          *vtcd;
 112 };
 113
 114 struct fsl_edma_chan {
 115         struct virt_dma_chan            vchan;
 116         enum dma_status                 status;
 117         enum fsl_edma_pm_state          pm_state;
 118         bool                            idle;
 119         u32                             slave_id;
 120         struct fsl_edma_engine          *edma;
 121         struct fsl_edma_desc            *edesc;
 122         struct dma_slave_config         cfg;
 123         u32                             attr;
 124         struct dma_pool                 *tcd_pool;
 125         dma_addr_t                      dma_dev_addr;
 126         u32                             dma_dev_size;
 127         enum dma_data_direction         dma_dir;
 128         char                            chan_name[16];
 129 };
 130
 131 struct fsl_edma_desc {
 132         struct virt_dma_desc            vdesc;
 133         struct fsl_edma_chan            *echan;
 134         bool                            iscyclic;
 135         enum dma_transfer_direction     dirn;
 136         unsigned int                    n_tcds;
 137         struct fsl_edma_sw_tcd          tcd[];
 138 };
 139
 140 enum edma_version {
 141         v1, /* 32ch, Vybrid, mpc57x, etc */
 142         v2, /* 64ch Coldfire */
 143         v3, /* 32ch, i.mx7ulp */
 144 };
 145
 146 struct fsl_edma_drvdata {
 147         enum edma_version       version;
 148         u32                     dmamuxs;
 149         bool                    has_dmaclk;
 150         bool                    mux_swap;
 151         int                     (*setup_irq)(struct platform_device *pdev,
 152                                              struct fsl_edma_engine *fsl_edma);
 153 };
 154
 155 struct fsl_edma_engine {
 156         struct dma_device       dma_dev;
 157         void __iomem            *membase;
 158         void __iomem            *muxbase[DMAMUX_NR];
 159         struct clk              *muxclk[DMAMUX_NR];
 160         struct clk              *dmaclk;
 161         struct mutex            fsl_edma_mutex;
 162         const struct fsl_edma_drvdata *drvdata;
 163         u32                     n_chans;
 164         int                     txirq;
 165         int                     errirq;
 166         bool                    big_endian;
 167         struct edma_regs        regs;
 168         struct fsl_edma_chan    chans[];
 169 };
 170
 171 /*
 172  * R/W functions for big- or little-endian registers:
 173  * The eDMA controller's endian is independent of the CPU core's endian.
 174  * For the big-endian IP module, the offset for 8-bit or 16-bit registers
 175  * should also be swapped opposite to that in little-endian IP.
 176  */
 177 static inline u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr)
 178 {
 179         if (edma->big_endian)
 180                 return ioread32be(addr);
 181         else
 182                 return ioread32(addr);
 183 }
 184
 185 static inline void edma_writeb(struct fsl_edma_engine *edma,
 186                                u8 val, void __iomem *addr)
 187 {
 188         /* swap the reg offset for these in big-endian mode */
 189         if (edma->big_endian)
 190                 iowrite8(val, (void __iomem *)((unsigned long)addr ^ 0x3));
 191         else
 192                 iowrite8(val, addr);
 193 }
 194
 195 static inline void edma_writew(struct fsl_edma_engine *edma,
 196                                u16 val, void __iomem *addr)
 197 {
 198         /* swap the reg offset for these in big-endian mode */
 199         if (edma->big_endian)
 200                 iowrite16be(val, (void __iomem *)((unsigned long)addr ^ 0x2));
 201         else
 202                 iowrite16(val, addr);
 203 }
 204
 205 static inline void edma_writel(struct fsl_edma_engine *edma,
 206                                u32 val, void __iomem *addr)
 207 {
 208         if (edma->big_endian)
 209                 iowrite32be(val, addr);
 210         else
 211                 iowrite32(val, addr);
 212 }
 213
 214 static inline struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan)
 215 {
 216         return container_of(chan, struct fsl_edma_chan, vchan.chan);
 217 }
 218
 219 static inline struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd)
 220 {
 221         return container_of(vd, struct fsl_edma_desc, vdesc);
 222 }
 223
 224 void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan);
 225 void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
 226                         unsigned int slot, bool enable);
 227 void fsl_edma_free_desc(struct virt_dma_desc *vdesc);
 228 int fsl_edma_terminate_all(struct dma_chan *chan);
 229 int fsl_edma_pause(struct dma_chan *chan);
 230 int fsl_edma_resume(struct dma_chan *chan);
 231 int fsl_edma_slave_config(struct dma_chan *chan,
 232                                  struct dma_slave_config *cfg);
 233 enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
 234                 dma_cookie_t cookie, struct dma_tx_state *txstate);
 235 struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
 236                 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
 237                 size_t period_len, enum dma_transfer_direction direction,
 238                 unsigned long flags);
 239 struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
 240                 struct dma_chan *chan, struct scatterlist *sgl,
 241                 unsigned int sg_len, enum dma_transfer_direction direction,
 242                 unsigned long flags, void *context);
 243 void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan);
 244 void fsl_edma_issue_pending(struct dma_chan *chan);
 245 int fsl_edma_alloc_chan_resources(struct dma_chan *chan);
 246 void fsl_edma_free_chan_resources(struct dma_chan *chan);
 247 void fsl_edma_cleanup_vchan(struct dma_device *dmadev);
 248 void fsl_edma_setup_regs(struct fsl_edma_engine *edma);
 249
 250 #endif /* _FSL_EDMA_COMMON_H_ */