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_ */ 340