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
  33 #define EDMA_TCD_CITER_CITER(x)         ((x) & GENMASK(14, 0))
  34 #define EDMA_TCD_BITER_BITER(x)         ((x) & GENMASK(14, 0))
  35
  36 #define EDMA_TCD_CSR_START              BIT(0)
  37 #define EDMA_TCD_CSR_INT_MAJOR          BIT(1)
  38 #define EDMA_TCD_CSR_INT_HALF           BIT(2)
  39 #define EDMA_TCD_CSR_D_REQ              BIT(3)
  40 #define EDMA_TCD_CSR_E_SG               BIT(4)
  41 #define EDMA_TCD_CSR_E_LINK             BIT(5)
  42 #define EDMA_TCD_CSR_ACTIVE             BIT(6)
  43 #define EDMA_TCD_CSR_DONE               BIT(7)
  44
  45 #define EDMA_V3_TCD_NBYTES_MLOFF_NBYTES(x) ((x) & GENMASK(9, 0))
  46 #define EDMA_V3_TCD_NBYTES_MLOFF(x)        (x << 10)
  47 #define EDMA_V3_TCD_NBYTES_DMLOE           (1 << 30)
  48 #define EDMA_V3_TCD_NBYTES_SMLOE           (1 << 31)
  49
  50 #define EDMAMUX_CHCFG_DIS               0x0
  51 #define EDMAMUX_CHCFG_ENBL              0x80
  52 #define EDMAMUX_CHCFG_SOURCE(n)         ((n) & 0x3F)
  53
  54 #define DMAMUX_NR       2
  55
  56 #define EDMA_TCD                0x1000
  57
  58 #define FSL_EDMA_BUSWIDTHS      (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
  59                                  BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
  60                                  BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
  61                                  BIT(DMA_SLAVE_BUSWIDTH_8_BYTES))
  62
  63 #define EDMA_V3_CH_SBR_RD          BIT(22)
  64 #define EDMA_V3_CH_SBR_WR          BIT(21)
  65 #define EDMA_V3_CH_CSR_ERQ         BIT(0)
  66 #define EDMA_V3_CH_CSR_EARQ        BIT(1)
  67 #define EDMA_V3_CH_CSR_EEI         BIT(2)
  68 #define EDMA_V3_CH_CSR_DONE        BIT(30)
  69 #define EDMA_V3_CH_CSR_ACTIVE      BIT(31)
  70
  71 enum fsl_edma_pm_state {
  72         RUNNING = 0,
  73         SUSPENDED,
  74 };
  75
  76 struct fsl_edma_hw_tcd {
  77         __le32  saddr;
  78         __le16  soff;
  79         __le16  attr;
  80         __le32  nbytes;
  81         __le32  slast;
  82         __le32  daddr;
  83         __le16  doff;
  84         __le16  citer;
  85         __le32  dlast_sga;
  86         __le16  csr;
  87         __le16  biter;
  88 };
  89
  90 struct fsl_edma3_ch_reg {
  91         __le32  ch_csr;
  92         __le32  ch_es;
  93         __le32  ch_int;
  94         __le32  ch_sbr;
  95         __le32  ch_pri;
  96         __le32  ch_mux;
  97         __le32  ch_mattr; /* edma4, reserved for edma3 */
  98         __le32  ch_reserved;
  99         struct fsl_edma_hw_tcd tcd;
 100 } __packed;
 101
 102 /*
 103  * These are iomem pointers, for both v32 and v64.
 104  */
 105 struct edma_regs {
 106         void __iomem *cr;
 107         void __iomem *es;
 108         void __iomem *erqh;
 109         void __iomem *erql;     /* aka erq on v32 */
 110         void __iomem *eeih;
 111         void __iomem *eeil;     /* aka eei on v32 */
 112         void __iomem *seei;
 113         void __iomem *ceei;
 114         void __iomem *serq;
 115         void __iomem *cerq;
 116         void __iomem *cint;
 117         void __iomem *cerr;
 118         void __iomem *ssrt;
 119         void __iomem *cdne;
 120         void __iomem *inth;
 121         void __iomem *intl;
 122         void __iomem *errh;
 123         void __iomem *errl;
 124 };
 125
 126 struct fsl_edma_sw_tcd {
 127         dma_addr_t                      ptcd;
 128         struct fsl_edma_hw_tcd          *vtcd;
 129 };
 130
 131 struct fsl_edma_chan {
 132         struct virt_dma_chan            vchan;
 133         enum dma_status                 status;
 134         enum fsl_edma_pm_state          pm_state;
 135         bool                            idle;
 136         u32                             slave_id;
 137         struct fsl_edma_engine          *edma;
 138         struct fsl_edma_desc            *edesc;
 139         struct dma_slave_config         cfg;
 140         u32                             attr;
 141         bool                            is_sw;
 142         struct dma_pool                 *tcd_pool;
 143         dma_addr_t                      dma_dev_addr;
 144         u32                             dma_dev_size;
 145         enum dma_data_direction         dma_dir;
 146         char                            chan_name[32];
 147         struct fsl_edma_hw_tcd __iomem *tcd;
 148         u32                             real_count;
 149         struct work_struct              issue_worker;
 150         struct platform_device          *pdev;
 151         struct device                   *pd_dev;
 152         u32                             srcid;
 153         struct clk                      *clk;
 154         int                             priority;
 155         int                             hw_chanid;
 156         int                             txirq;
 157         bool                            is_rxchan;
 158         bool                            is_remote;
 159         bool                            is_multi_fifo;
 160 };
 161
 162 struct fsl_edma_desc {
 163         struct virt_dma_desc            vdesc;
 164         struct fsl_edma_chan            *echan;
 165         bool                            iscyclic;
 166         enum dma_transfer_direction     dirn;
 167         unsigned int                    n_tcds;
 168         struct fsl_edma_sw_tcd          tcd[];
 169 };
 170
 171 #define FSL_EDMA_DRV_HAS_DMACLK         BIT(0)
 172 #define FSL_EDMA_DRV_MUX_SWAP           BIT(1)
 173 #define FSL_EDMA_DRV_CONFIG32           BIT(2)
 174 #define FSL_EDMA_DRV_WRAP_IO            BIT(3)
 175 #define FSL_EDMA_DRV_EDMA64             BIT(4)
 176 #define FSL_EDMA_DRV_HAS_PD             BIT(5)
 177 #define FSL_EDMA_DRV_HAS_CHCLK          BIT(6)
 178 #define FSL_EDMA_DRV_HAS_CHMUX          BIT(7)
 179 /* imx8 QM audio edma remote local swapped */
 180 #define FSL_EDMA_DRV_QUIRK_SWAPPED      BIT(8)
 181 /* control and status register is in tcd address space, edma3 reg layout */
 182 #define FSL_EDMA_DRV_SPLIT_REG          BIT(9)
 183 #define FSL_EDMA_DRV_BUS_8BYTE          BIT(10)
 184 #define FSL_EDMA_DRV_DEV_TO_DEV         BIT(11)
 185 #define FSL_EDMA_DRV_ALIGN_64BYTE       BIT(12)
 186
 187 #define FSL_EDMA_DRV_EDMA3      (FSL_EDMA_DRV_SPLIT_REG |       \
 188                                  FSL_EDMA_DRV_BUS_8BYTE |       \
 189                                  FSL_EDMA_DRV_DEV_TO_DEV |      \
 190                                  FSL_EDMA_DRV_ALIGN_64BYTE)
 191
 192 struct fsl_edma_drvdata {
 193         u32                     dmamuxs; /* only used before v3 */
 194         u32                     chreg_off;
 195         u32                     chreg_space_sz;
 196         u32                     flags;
 197         int                     (*setup_irq)(struct platform_device *pdev,
 198                                              struct fsl_edma_engine *fsl_edma);
 199 };
 200
 201 struct fsl_edma_engine {
 202         struct dma_device       dma_dev;
 203         void __iomem            *membase;
 204         void __iomem            *muxbase[DMAMUX_NR];
 205         struct clk              *muxclk[DMAMUX_NR];
 206         struct clk              *dmaclk;
 207         struct clk              *chclk;
 208         struct mutex            fsl_edma_mutex;
 209         const struct fsl_edma_drvdata *drvdata;
 210         u32                     n_chans;
 211         int                     txirq;
 212         int                     errirq;
 213         bool                    big_endian;
 214         struct edma_regs        regs;
 215         u64                     chan_masked;
 216         struct fsl_edma_chan    chans[];
 217 };
 218
 219 #define edma_read_tcdreg(chan, __name)                          \
 220 (sizeof(chan->tcd->__name) == sizeof(u32) ?                     \
 221         edma_readl(chan->edma, &chan->tcd->__name) :            \
 222         edma_readw(chan->edma, &chan->tcd->__name))
 223
 224 #define edma_write_tcdreg(chan, val, __name)                    \
 225 (sizeof(chan->tcd->__name) == sizeof(u32) ?                     \
 226         edma_writel(chan->edma, (u32 __force)val, &chan->tcd->__name) : \
 227         edma_writew(chan->edma, (u16 __force)val, &chan->tcd->__name))
 228
 229 #define edma_readl_chreg(chan, __name)                          \
 230         edma_readl(chan->edma,                                  \
 231                    (void __iomem *)&(container_of(chan->tcd, struct fsl_edma3_ch_reg, tcd)->__name))
 232
 233 #define edma_writel_chreg(chan, val,  __name)                   \
 234         edma_writel(chan->edma, val,                            \
 235                    (void __iomem *)&(container_of(chan->tcd, struct fsl_edma3_ch_reg, tcd)->__name))
 236
 237 /*
 238  * R/W functions for big- or little-endian registers:
 239  * The eDMA controller's endian is independent of the CPU core's endian.
 240  * For the big-endian IP module, the offset for 8-bit or 16-bit registers
 241  * should also be swapped opposite to that in little-endian IP.
 242  */
 243 static inline u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr)
 244 {
 245         if (edma->big_endian)
 246                 return ioread32be(addr);
 247         else
 248                 return ioread32(addr);
 249 }
 250
 251 static inline u16 edma_readw(struct fsl_edma_engine *edma, void __iomem *addr)
 252 {
 253         if (edma->big_endian)
 254                 return ioread16be(addr);
 255         else
 256                 return ioread16(addr);
 257 }
 258
 259 static inline void edma_writeb(struct fsl_edma_engine *edma,
 260                                u8 val, void __iomem *addr)
 261 {
 262         /* swap the reg offset for these in big-endian mode */
 263         if (edma->big_endian)
 264                 iowrite8(val, (void __iomem *)((unsigned long)addr ^ 0x3));
 265         else
 266                 iowrite8(val, addr);
 267 }
 268
 269 static inline void edma_writew(struct fsl_edma_engine *edma,
 270                                u16 val, void __iomem *addr)
 271 {
 272         /* swap the reg offset for these in big-endian mode */
 273         if (edma->big_endian)
 274                 iowrite16be(val, (void __iomem *)((unsigned long)addr ^ 0x2));
 275         else
 276                 iowrite16(val, addr);
 277 }
 278
 279 static inline void edma_writel(struct fsl_edma_engine *edma,
 280                                u32 val, void __iomem *addr)
 281 {
 282         if (edma->big_endian)
 283                 iowrite32be(val, addr);
 284         else
 285                 iowrite32(val, addr);
 286 }
 287
 288 static inline struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan)
 289 {
 290         return container_of(chan, struct fsl_edma_chan, vchan.chan);
 291 }
 292
 293 static inline u32 fsl_edma_drvflags(struct fsl_edma_chan *fsl_chan)
 294 {
 295         return fsl_chan->edma->drvdata->flags;
 296 }
 297
 298 static inline struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd)
 299 {
 300         return container_of(vd, struct fsl_edma_desc, vdesc);
 301 }
 302
 303 static inline void fsl_edma_err_chan_handler(struct fsl_edma_chan *fsl_chan)
 304 {
 305         fsl_chan->status = DMA_ERROR;
 306         fsl_chan->idle = true;
 307 }
 308
 309 void fsl_edma_tx_chan_handler(struct fsl_edma_chan *fsl_chan);
 310 void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan);
 311 void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
 312                         unsigned int slot, bool enable);
 313 void fsl_edma_free_desc(struct virt_dma_desc *vdesc);
 314 int fsl_edma_terminate_all(struct dma_chan *chan);
 315 int fsl_edma_pause(struct dma_chan *chan);
 316 int fsl_edma_resume(struct dma_chan *chan);
 317 int fsl_edma_slave_config(struct dma_chan *chan,
 318                                  struct dma_slave_config *cfg);
 319 enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
 320                 dma_cookie_t cookie, struct dma_tx_state *txstate);
 321 struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
 322                 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
 323                 size_t period_len, enum dma_transfer_direction direction,
 324                 unsigned long flags);
 325 struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
 326                 struct dma_chan *chan, struct scatterlist *sgl,
 327                 unsigned int sg_len, enum dma_transfer_direction direction,
 328                 unsigned long flags, void *context);
 329 struct dma_async_tx_descriptor *fsl_edma_prep_memcpy(
 330                 struct dma_chan *chan, dma_addr_t dma_dst, dma_addr_t dma_src,
 331                 size_t len, unsigned long flags);
 332 void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan);
 333 void fsl_edma_issue_pending(struct dma_chan *chan);
 334 int fsl_edma_alloc_chan_resources(struct dma_chan *chan);
 335 void fsl_edma_free_chan_resources(struct dma_chan *chan);
 336 void fsl_edma_cleanup_vchan(struct dma_device *dmadev);
 337 void fsl_edma_setup_regs(struct fsl_edma_engine *edma);
 338
 339 #endif /* _FSL_EDMA_COMMON_H_ */