1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * DMA driver for Xilinx Video DMA Engine 4 * 5 * Copyright (C) 2010-2014 Xilinx, Inc. All rights reserved. 6 * 7 * Based on the Freescale DMA driver. 8 * 9 * Description: 10 * The AXI Video Direct Memory Access (AXI VDMA) core is a soft Xilinx IP 11 * core that provides high-bandwidth direct memory access between memory 12 * and AXI4-Stream type video target peripherals. The core provides efficient 13 * two dimensional DMA operations with independent asynchronous read (S2MM) 14 * and write (MM2S) channel operation. It can be configured to have either 15 * one channel or two channels. If configured as two channels, one is to 16 * transmit to the video device (MM2S) and another is to receive from the 17 * video device (S2MM). Initialization, status, interrupt and management 18 * registers are accessed through an AXI4-Lite slave interface. 19 * 20 * The AXI Direct Memory Access (AXI DMA) core is a soft Xilinx IP core that 21 * provides high-bandwidth one dimensional direct memory access between memory 22 * and AXI4-Stream target peripherals. It supports one receive and one 23 * transmit channel, both of them optional at synthesis time. 24 * 25 * The AXI CDMA, is a soft IP, which provides high-bandwidth Direct Memory 26 * Access (DMA) between a memory-mapped source address and a memory-mapped 27 * destination address. 28 * 29 * The AXI Multichannel Direct Memory Access (AXI MCDMA) core is a soft 30 * Xilinx IP that provides high-bandwidth direct memory access between 31 * memory and AXI4-Stream target peripherals. It provides scatter gather 32 * (SG) interface with multiple channels independent configuration support. 33 * 34 */ 35 36 #include <linux/bitops.h> 37 #include <linux/dmapool.h> 38 #include <linux/dma/xilinx_dma.h> 39 #include <linux/init.h> 40 #include <linux/interrupt.h> 41 #include <linux/io.h> 42 #include <linux/iopoll.h> 43 #include <linux/module.h> 44 #include <linux/of_address.h> 45 #include <linux/of_dma.h> 46 #include <linux/of_platform.h> 47 #include <linux/of_irq.h> 48 #include <linux/slab.h> 49 #include <linux/clk.h> 50 #include <linux/io-64-nonatomic-lo-hi.h> 51 52 #include "../dmaengine.h" 53 54 /* Register/Descriptor Offsets */ 55 #define XILINX_DMA_MM2S_CTRL_OFFSET 0x0000 56 #define XILINX_DMA_S2MM_CTRL_OFFSET 0x0030 57 #define XILINX_VDMA_MM2S_DESC_OFFSET 0x0050 58 #define XILINX_VDMA_S2MM_DESC_OFFSET 0x00a0 59 60 /* Control Registers */ 61 #define XILINX_DMA_REG_DMACR 0x0000 62 #define XILINX_DMA_DMACR_DELAY_MAX 0xff 63 #define XILINX_DMA_DMACR_DELAY_SHIFT 24 64 #define XILINX_DMA_DMACR_FRAME_COUNT_MAX 0xff 65 #define XILINX_DMA_DMACR_FRAME_COUNT_SHIFT 16 66 #define XILINX_DMA_DMACR_ERR_IRQ BIT(14) 67 #define XILINX_DMA_DMACR_DLY_CNT_IRQ BIT(13) 68 #define XILINX_DMA_DMACR_FRM_CNT_IRQ BIT(12) 69 #define XILINX_DMA_DMACR_MASTER_SHIFT 8 70 #define XILINX_DMA_DMACR_FSYNCSRC_SHIFT 5 71 #define XILINX_DMA_DMACR_FRAMECNT_EN BIT(4) 72 #define XILINX_DMA_DMACR_GENLOCK_EN BIT(3) 73 #define XILINX_DMA_DMACR_RESET BIT(2) 74 #define XILINX_DMA_DMACR_CIRC_EN BIT(1) 75 #define XILINX_DMA_DMACR_RUNSTOP BIT(0) 76 #define XILINX_DMA_DMACR_FSYNCSRC_MASK GENMASK(6, 5) 77 #define XILINX_DMA_DMACR_DELAY_MASK GENMASK(31, 24) 78 #define XILINX_DMA_DMACR_FRAME_COUNT_MASK GENMASK(23, 16) 79 #define XILINX_DMA_DMACR_MASTER_MASK GENMASK(11, 8) 80 81 #define XILINX_DMA_REG_DMASR 0x0004 82 #define XILINX_DMA_DMASR_EOL_LATE_ERR BIT(15) 83 #define XILINX_DMA_DMASR_ERR_IRQ BIT(14) 84 #define XILINX_DMA_DMASR_DLY_CNT_IRQ BIT(13) 85 #define XILINX_DMA_DMASR_FRM_CNT_IRQ BIT(12) 86 #define XILINX_DMA_DMASR_SOF_LATE_ERR BIT(11) 87 #define XILINX_DMA_DMASR_SG_DEC_ERR BIT(10) 88 #define XILINX_DMA_DMASR_SG_SLV_ERR BIT(9) 89 #define XILINX_DMA_DMASR_EOF_EARLY_ERR BIT(8) 90 #define XILINX_DMA_DMASR_SOF_EARLY_ERR BIT(7) 91 #define XILINX_DMA_DMASR_DMA_DEC_ERR BIT(6) 92 #define XILINX_DMA_DMASR_DMA_SLAVE_ERR BIT(5) 93 #define XILINX_DMA_DMASR_DMA_INT_ERR BIT(4) 94 #define XILINX_DMA_DMASR_SG_MASK BIT(3) 95 #define XILINX_DMA_DMASR_IDLE BIT(1) 96 #define XILINX_DMA_DMASR_HALTED BIT(0) 97 #define XILINX_DMA_DMASR_DELAY_MASK GENMASK(31, 24) 98 #define XILINX_DMA_DMASR_FRAME_COUNT_MASK GENMASK(23, 16) 99 100 #define XILINX_DMA_REG_CURDESC 0x0008 101 #define XILINX_DMA_REG_TAILDESC 0x0010 102 #define XILINX_DMA_REG_REG_INDEX 0x0014 103 #define XILINX_DMA_REG_FRMSTORE 0x0018 104 #define XILINX_DMA_REG_THRESHOLD 0x001c 105 #define XILINX_DMA_REG_FRMPTR_STS 0x0024 106 #define XILINX_DMA_REG_PARK_PTR 0x0028 107 #define XILINX_DMA_PARK_PTR_WR_REF_SHIFT 8 108 #define XILINX_DMA_PARK_PTR_WR_REF_MASK GENMASK(12, 8) 109 #define XILINX_DMA_PARK_PTR_RD_REF_SHIFT 0 110 #define XILINX_DMA_PARK_PTR_RD_REF_MASK GENMASK(4, 0) 111 #define XILINX_DMA_REG_VDMA_VERSION 0x002c 112 113 /* Register Direct Mode Registers */ 114 #define XILINX_DMA_REG_VSIZE 0x0000 115 #define XILINX_DMA_REG_HSIZE 0x0004 116 117 #define XILINX_DMA_REG_FRMDLY_STRIDE 0x0008 118 #define XILINX_DMA_FRMDLY_STRIDE_FRMDLY_SHIFT 24 119 #define XILINX_DMA_FRMDLY_STRIDE_STRIDE_SHIFT 0 120 121 #define XILINX_VDMA_REG_START_ADDRESS(n) (0x000c + 4 * (n)) 122 #define XILINX_VDMA_REG_START_ADDRESS_64(n) (0x000c + 8 * (n)) 123 124 #define XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP 0x00ec 125 #define XILINX_VDMA_ENABLE_VERTICAL_FLIP BIT(0) 126 127 /* HW specific definitions */ 128 #define XILINX_MCDMA_MAX_CHANS_PER_DEVICE 0x20 129 #define XILINX_DMA_MAX_CHANS_PER_DEVICE 0x2 130 #define XILINX_CDMA_MAX_CHANS_PER_DEVICE 0x1 131 132 #define XILINX_DMA_DMAXR_ALL_IRQ_MASK \ 133 (XILINX_DMA_DMASR_FRM_CNT_IRQ | \ 134 XILINX_DMA_DMASR_DLY_CNT_IRQ | \ 135 XILINX_DMA_DMASR_ERR_IRQ) 136 137 #define XILINX_DMA_DMASR_ALL_ERR_MASK \ 138 (XILINX_DMA_DMASR_EOL_LATE_ERR | \ 139 XILINX_DMA_DMASR_SOF_LATE_ERR | \ 140 XILINX_DMA_DMASR_SG_DEC_ERR | \ 141 XILINX_DMA_DMASR_SG_SLV_ERR | \ 142 XILINX_DMA_DMASR_EOF_EARLY_ERR | \ 143 XILINX_DMA_DMASR_SOF_EARLY_ERR | \ 144 XILINX_DMA_DMASR_DMA_DEC_ERR | \ 145 XILINX_DMA_DMASR_DMA_SLAVE_ERR | \ 146 XILINX_DMA_DMASR_DMA_INT_ERR) 147 148 /* 149 * Recoverable errors are DMA Internal error, SOF Early, EOF Early 150 * and SOF Late. They are only recoverable when C_FLUSH_ON_FSYNC 151 * is enabled in the h/w system. 152 */ 153 #define XILINX_DMA_DMASR_ERR_RECOVER_MASK \ 154 (XILINX_DMA_DMASR_SOF_LATE_ERR | \ 155 XILINX_DMA_DMASR_EOF_EARLY_ERR | \ 156 XILINX_DMA_DMASR_SOF_EARLY_ERR | \ 157 XILINX_DMA_DMASR_DMA_INT_ERR) 158 159 /* Axi VDMA Flush on Fsync bits */ 160 #define XILINX_DMA_FLUSH_S2MM 3 161 #define XILINX_DMA_FLUSH_MM2S 2 162 #define XILINX_DMA_FLUSH_BOTH 1 163 164 /* Delay loop counter to prevent hardware failure */ 165 #define XILINX_DMA_LOOP_COUNT 1000000 166 167 /* AXI DMA Specific Registers/Offsets */ 168 #define XILINX_DMA_REG_SRCDSTADDR 0x18 169 #define XILINX_DMA_REG_BTT 0x28 170 171 /* AXI DMA Specific Masks/Bit fields */ 172 #define XILINX_DMA_MAX_TRANS_LEN_MIN 8 173 #define XILINX_DMA_MAX_TRANS_LEN_MAX 23 174 #define XILINX_DMA_V2_MAX_TRANS_LEN_MAX 26 175 #define XILINX_DMA_CR_COALESCE_MAX GENMASK(23, 16) 176 #define XILINX_DMA_CR_CYCLIC_BD_EN_MASK BIT(4) 177 #define XILINX_DMA_CR_COALESCE_SHIFT 16 178 #define XILINX_DMA_BD_SOP BIT(27) 179 #define XILINX_DMA_BD_EOP BIT(26) 180 #define XILINX_DMA_COALESCE_MAX 255 181 #define XILINX_DMA_NUM_DESCS 255 182 #define XILINX_DMA_NUM_APP_WORDS 5 183 184 /* AXI CDMA Specific Registers/Offsets */ 185 #define XILINX_CDMA_REG_SRCADDR 0x18 186 #define XILINX_CDMA_REG_DSTADDR 0x20 187 188 /* AXI CDMA Specific Masks */ 189 #define XILINX_CDMA_CR_SGMODE BIT(3) 190 191 #define xilinx_prep_dma_addr_t(addr) \ 192 ((dma_addr_t)((u64)addr##_##msb << 32 | (addr))) 193 194 /* AXI MCDMA Specific Registers/Offsets */ 195 #define XILINX_MCDMA_MM2S_CTRL_OFFSET 0x0000 196 #define XILINX_MCDMA_S2MM_CTRL_OFFSET 0x0500 197 #define XILINX_MCDMA_CHEN_OFFSET 0x0008 198 #define XILINX_MCDMA_CH_ERR_OFFSET 0x0010 199 #define XILINX_MCDMA_RXINT_SER_OFFSET 0x0020 200 #define XILINX_MCDMA_TXINT_SER_OFFSET 0x0028 201 #define XILINX_MCDMA_CHAN_CR_OFFSET(x) (0x40 + (x) * 0x40) 202 #define XILINX_MCDMA_CHAN_SR_OFFSET(x) (0x44 + (x) * 0x40) 203 #define XILINX_MCDMA_CHAN_CDESC_OFFSET(x) (0x48 + (x) * 0x40) 204 #define XILINX_MCDMA_CHAN_TDESC_OFFSET(x) (0x50 + (x) * 0x40) 205 206 /* AXI MCDMA Specific Masks/Shifts */ 207 #define XILINX_MCDMA_COALESCE_SHIFT 16 208 #define XILINX_MCDMA_COALESCE_MAX 24 209 #define XILINX_MCDMA_IRQ_ALL_MASK GENMASK(7, 5) 210 #define XILINX_MCDMA_COALESCE_MASK GENMASK(23, 16) 211 #define XILINX_MCDMA_CR_RUNSTOP_MASK BIT(0) 212 #define XILINX_MCDMA_IRQ_IOC_MASK BIT(5) 213 #define XILINX_MCDMA_IRQ_DELAY_MASK BIT(6) 214 #define XILINX_MCDMA_IRQ_ERR_MASK BIT(7) 215 #define XILINX_MCDMA_BD_EOP BIT(30) 216 #define XILINX_MCDMA_BD_SOP BIT(31) 217 218 /** 219 * struct xilinx_vdma_desc_hw - Hardware Descriptor 220 * @next_desc: Next Descriptor Pointer @0x00 221 * @pad1: Reserved @0x04 222 * @buf_addr: Buffer address @0x08 223 * @buf_addr_msb: MSB of Buffer address @0x0C 224 * @vsize: Vertical Size @0x10 225 * @hsize: Horizontal Size @0x14 226 * @stride: Number of bytes between the first 227 * pixels of each horizontal line @0x18 228 */ 229 struct xilinx_vdma_desc_hw { 230 u32 next_desc; 231 u32 pad1; 232 u32 buf_addr; 233 u32 buf_addr_msb; 234 u32 vsize; 235 u32 hsize; 236 u32 stride; 237 } __aligned(64); 238 239 /** 240 * struct xilinx_axidma_desc_hw - Hardware Descriptor for AXI DMA 241 * @next_desc: Next Descriptor Pointer @0x00 242 * @next_desc_msb: MSB of Next Descriptor Pointer @0x04 243 * @buf_addr: Buffer address @0x08 244 * @buf_addr_msb: MSB of Buffer address @0x0C 245 * @reserved1: Reserved @0x10 246 * @reserved2: Reserved @0x14 247 * @control: Control field @0x18 248 * @status: Status field @0x1C 249 * @app: APP Fields @0x20 - 0x30 250 */ 251 struct xilinx_axidma_desc_hw { 252 u32 next_desc; 253 u32 next_desc_msb; 254 u32 buf_addr; 255 u32 buf_addr_msb; 256 u32 reserved1; 257 u32 reserved2; 258 u32 control; 259 u32 status; 260 u32 app[XILINX_DMA_NUM_APP_WORDS]; 261 } __aligned(64); 262 263 /** 264 * struct xilinx_aximcdma_desc_hw - Hardware Descriptor for AXI MCDMA 265 * @next_desc: Next Descriptor Pointer @0x00 266 * @next_desc_msb: MSB of Next Descriptor Pointer @0x04 267 * @buf_addr: Buffer address @0x08 268 * @buf_addr_msb: MSB of Buffer address @0x0C 269 * @rsvd: Reserved field @0x10 270 * @control: Control Information field @0x14 271 * @status: Status field @0x18 272 * @sideband_status: Status of sideband signals @0x1C 273 * @app: APP Fields @0x20 - 0x30 274 */ 275 struct xilinx_aximcdma_desc_hw { 276 u32 next_desc; 277 u32 next_desc_msb; 278 u32 buf_addr; 279 u32 buf_addr_msb; 280 u32 rsvd; 281 u32 control; 282 u32 status; 283 u32 sideband_status; 284 u32 app[XILINX_DMA_NUM_APP_WORDS]; 285 } __aligned(64); 286 287 /** 288 * struct xilinx_cdma_desc_hw - Hardware Descriptor 289 * @next_desc: Next Descriptor Pointer @0x00 290 * @next_desc_msb: Next Descriptor Pointer MSB @0x04 291 * @src_addr: Source address @0x08 292 * @src_addr_msb: Source address MSB @0x0C 293 * @dest_addr: Destination address @0x10 294 * @dest_addr_msb: Destination address MSB @0x14 295 * @control: Control field @0x18 296 * @status: Status field @0x1C 297 */ 298 struct xilinx_cdma_desc_hw { 299 u32 next_desc; 300 u32 next_desc_msb; 301 u32 src_addr; 302 u32 src_addr_msb; 303 u32 dest_addr; 304 u32 dest_addr_msb; 305 u32 control; 306 u32 status; 307 } __aligned(64); 308 309 /** 310 * struct xilinx_vdma_tx_segment - Descriptor segment 311 * @hw: Hardware descriptor 312 * @node: Node in the descriptor segments list 313 * @phys: Physical address of segment 314 */ 315 struct xilinx_vdma_tx_segment { 316 struct xilinx_vdma_desc_hw hw; 317 struct list_head node; 318 dma_addr_t phys; 319 } __aligned(64); 320 321 /** 322 * struct xilinx_axidma_tx_segment - Descriptor segment 323 * @hw: Hardware descriptor 324 * @node: Node in the descriptor segments list 325 * @phys: Physical address of segment 326 */ 327 struct xilinx_axidma_tx_segment { 328 struct xilinx_axidma_desc_hw hw; 329 struct list_head node; 330 dma_addr_t phys; 331 } __aligned(64); 332 333 /** 334 * struct xilinx_aximcdma_tx_segment - Descriptor segment 335 * @hw: Hardware descriptor 336 * @node: Node in the descriptor segments list 337 * @phys: Physical address of segment 338 */ 339 struct xilinx_aximcdma_tx_segment { 340 struct xilinx_aximcdma_desc_hw hw; 341 struct list_head node; 342 dma_addr_t phys; 343 } __aligned(64); 344 345 /** 346 * struct xilinx_cdma_tx_segment - Descriptor segment 347 * @hw: Hardware descriptor 348 * @node: Node in the descriptor segments list 349 * @phys: Physical address of segment 350 */ 351 struct xilinx_cdma_tx_segment { 352 struct xilinx_cdma_desc_hw hw; 353 struct list_head node; 354 dma_addr_t phys; 355 } __aligned(64); 356 357 /** 358 * struct xilinx_dma_tx_descriptor - Per Transaction structure 359 * @async_tx: Async transaction descriptor 360 * @segments: TX segments list 361 * @node: Node in the channel descriptors list 362 * @cyclic: Check for cyclic transfers. 363 * @err: Whether the descriptor has an error. 364 * @residue: Residue of the completed descriptor 365 */ 366 struct xilinx_dma_tx_descriptor { 367 struct dma_async_tx_descriptor async_tx; 368 struct list_head segments; 369 struct list_head node; 370 bool cyclic; 371 bool err; 372 u32 residue; 373 }; 374 375 /** 376 * struct xilinx_dma_chan - Driver specific DMA channel structure 377 * @xdev: Driver specific device structure 378 * @ctrl_offset: Control registers offset 379 * @desc_offset: TX descriptor registers offset 380 * @lock: Descriptor operation lock 381 * @pending_list: Descriptors waiting 382 * @active_list: Descriptors ready to submit 383 * @done_list: Complete descriptors 384 * @free_seg_list: Free descriptors 385 * @common: DMA common channel 386 * @desc_pool: Descriptors pool 387 * @dev: The dma device 388 * @irq: Channel IRQ 389 * @id: Channel ID 390 * @direction: Transfer direction 391 * @num_frms: Number of frames 392 * @has_sg: Support scatter transfers 393 * @cyclic: Check for cyclic transfers. 394 * @genlock: Support genlock mode 395 * @err: Channel has errors 396 * @idle: Check for channel idle 397 * @terminating: Check for channel being synchronized by user 398 * @tasklet: Cleanup work after irq 399 * @config: Device configuration info 400 * @flush_on_fsync: Flush on Frame sync 401 * @desc_pendingcount: Descriptor pending count 402 * @ext_addr: Indicates 64 bit addressing is supported by dma channel 403 * @desc_submitcount: Descriptor h/w submitted count 404 * @seg_v: Statically allocated segments base 405 * @seg_mv: Statically allocated segments base for MCDMA 406 * @seg_p: Physical allocated segments base 407 * @cyclic_seg_v: Statically allocated segment base for cyclic transfers 408 * @cyclic_seg_p: Physical allocated segments base for cyclic dma 409 * @start_transfer: Differentiate b/w DMA IP's transfer 410 * @stop_transfer: Differentiate b/w DMA IP's quiesce 411 * @tdest: TDEST value for mcdma 412 * @has_vflip: S2MM vertical flip 413 */ 414 struct xilinx_dma_chan { 415 struct xilinx_dma_device *xdev; 416 u32 ctrl_offset; 417 u32 desc_offset; 418 spinlock_t lock; 419 struct list_head pending_list; 420 struct list_head active_list; 421 struct list_head done_list; 422 struct list_head free_seg_list; 423 struct dma_chan common; 424 struct dma_pool *desc_pool; 425 struct device *dev; 426 int irq; 427 int id; 428 enum dma_transfer_direction direction; 429 int num_frms; 430 bool has_sg; 431 bool cyclic; 432 bool genlock; 433 bool err; 434 bool idle; 435 bool terminating; 436 struct tasklet_struct tasklet; 437 struct xilinx_vdma_config config; 438 bool flush_on_fsync; 439 u32 desc_pendingcount; 440 bool ext_addr; 441 u32 desc_submitcount; 442 struct xilinx_axidma_tx_segment *seg_v; 443 struct xilinx_aximcdma_tx_segment *seg_mv; 444 dma_addr_t seg_p; 445 struct xilinx_axidma_tx_segment *cyclic_seg_v; 446 dma_addr_t cyclic_seg_p; 447 void (*start_transfer)(struct xilinx_dma_chan *chan); 448 int (*stop_transfer)(struct xilinx_dma_chan *chan); 449 u16 tdest; 450 bool has_vflip; 451 }; 452 453 /** 454 * enum xdma_ip_type - DMA IP type. 455 * 456 * @XDMA_TYPE_AXIDMA: Axi dma ip. 457 * @XDMA_TYPE_CDMA: Axi cdma ip. 458 * @XDMA_TYPE_VDMA: Axi vdma ip. 459 * @XDMA_TYPE_AXIMCDMA: Axi MCDMA ip. 460 * 461 */ 462 enum xdma_ip_type { 463 XDMA_TYPE_AXIDMA = 0, 464 XDMA_TYPE_CDMA, 465 XDMA_TYPE_VDMA, 466 XDMA_TYPE_AXIMCDMA 467 }; 468 469 struct xilinx_dma_config { 470 enum xdma_ip_type dmatype; 471 int (*clk_init)(struct platform_device *pdev, struct clk **axi_clk, 472 struct clk **tx_clk, struct clk **txs_clk, 473 struct clk **rx_clk, struct clk **rxs_clk); 474 irqreturn_t (*irq_handler)(int irq, void *data); 475 const int max_channels; 476 }; 477 478 /** 479 * struct xilinx_dma_device - DMA device structure 480 * @regs: I/O mapped base address 481 * @dev: Device Structure 482 * @common: DMA device structure 483 * @chan: Driver specific DMA channel 484 * @flush_on_fsync: Flush on frame sync 485 * @ext_addr: Indicates 64 bit addressing is supported by dma device 486 * @pdev: Platform device structure pointer 487 * @dma_config: DMA config structure 488 * @axi_clk: DMA Axi4-lite interace clock 489 * @tx_clk: DMA mm2s clock 490 * @txs_clk: DMA mm2s stream clock 491 * @rx_clk: DMA s2mm clock 492 * @rxs_clk: DMA s2mm stream clock 493 * @s2mm_chan_id: DMA s2mm channel identifier 494 * @mm2s_chan_id: DMA mm2s channel identifier 495 * @max_buffer_len: Max buffer length 496 */ 497 struct xilinx_dma_device { 498 void __iomem *regs; 499 struct device *dev; 500 struct dma_device common; 501 struct xilinx_dma_chan *chan[XILINX_MCDMA_MAX_CHANS_PER_DEVICE]; 502 u32 flush_on_fsync; 503 bool ext_addr; 504 struct platform_device *pdev; 505 const struct xilinx_dma_config *dma_config; 506 struct clk *axi_clk; 507 struct clk *tx_clk; 508 struct clk *txs_clk; 509 struct clk *rx_clk; 510 struct clk *rxs_clk; 511 u32 s2mm_chan_id; 512 u32 mm2s_chan_id; 513 u32 max_buffer_len; 514 }; 515 516 /* Macros */ 517 #define to_xilinx_chan(chan) \ 518 container_of(chan, struct xilinx_dma_chan, common) 519 #define to_dma_tx_descriptor(tx) \ 520 container_of(tx, struct xilinx_dma_tx_descriptor, async_tx) 521 #define xilinx_dma_poll_timeout(chan, reg, val, cond, delay_us, timeout_us) \ 522 readl_poll_timeout_atomic(chan->xdev->regs + chan->ctrl_offset + reg, \ 523 val, cond, delay_us, timeout_us) 524 525 /* IO accessors */ 526 static inline u32 dma_read(struct xilinx_dma_chan *chan, u32 reg) 527 { 528 return ioread32(chan->xdev->regs + reg); 529 } 530 531 static inline void dma_write(struct xilinx_dma_chan *chan, u32 reg, u32 value) 532 { 533 iowrite32(value, chan->xdev->regs + reg); 534 } 535 536 static inline void vdma_desc_write(struct xilinx_dma_chan *chan, u32 reg, 537 u32 value) 538 { 539 dma_write(chan, chan->desc_offset + reg, value); 540 } 541 542 static inline u32 dma_ctrl_read(struct xilinx_dma_chan *chan, u32 reg) 543 { 544 return dma_read(chan, chan->ctrl_offset + reg); 545 } 546 547 static inline void dma_ctrl_write(struct xilinx_dma_chan *chan, u32 reg, 548 u32 value) 549 { 550 dma_write(chan, chan->ctrl_offset + reg, value); 551 } 552 553 static inline void dma_ctrl_clr(struct xilinx_dma_chan *chan, u32 reg, 554 u32 clr) 555 { 556 dma_ctrl_write(chan, reg, dma_ctrl_read(chan, reg) & ~clr); 557 } 558 559 static inline void dma_ctrl_set(struct xilinx_dma_chan *chan, u32 reg, 560 u32 set) 561 { 562 dma_ctrl_write(chan, reg, dma_ctrl_read(chan, reg) | set); 563 } 564 565 /** 566 * vdma_desc_write_64 - 64-bit descriptor write 567 * @chan: Driver specific VDMA channel 568 * @reg: Register to write 569 * @value_lsb: lower address of the descriptor. 570 * @value_msb: upper address of the descriptor. 571 * 572 * Since vdma driver is trying to write to a register offset which is not a 573 * multiple of 64 bits(ex : 0x5c), we are writing as two separate 32 bits 574 * instead of a single 64 bit register write. 575 */ 576 static inline void vdma_desc_write_64(struct xilinx_dma_chan *chan, u32 reg, 577 u32 value_lsb, u32 value_msb) 578 { 579 /* Write the lsb 32 bits*/ 580 writel(value_lsb, chan->xdev->regs + chan->desc_offset + reg); 581 582 /* Write the msb 32 bits */ 583 writel(value_msb, chan->xdev->regs + chan->desc_offset + reg + 4); 584 } 585 586 static inline void dma_writeq(struct xilinx_dma_chan *chan, u32 reg, u64 value) 587 { 588 lo_hi_writeq(value, chan->xdev->regs + chan->ctrl_offset + reg); 589 } 590 591 static inline void xilinx_write(struct xilinx_dma_chan *chan, u32 reg, 592 dma_addr_t addr) 593 { 594 if (chan->ext_addr) 595 dma_writeq(chan, reg, addr); 596 else 597 dma_ctrl_write(chan, reg, addr); 598 } 599 600 static inline void xilinx_axidma_buf(struct xilinx_dma_chan *chan, 601 struct xilinx_axidma_desc_hw *hw, 602 dma_addr_t buf_addr, size_t sg_used, 603 size_t period_len) 604 { 605 if (chan->ext_addr) { 606 hw->buf_addr = lower_32_bits(buf_addr + sg_used + period_len); 607 hw->buf_addr_msb = upper_32_bits(buf_addr + sg_used + 608 period_len); 609 } else { 610 hw->buf_addr = buf_addr + sg_used + period_len; 611 } 612 } 613 614 static inline void xilinx_aximcdma_buf(struct xilinx_dma_chan *chan, 615 struct xilinx_aximcdma_desc_hw *hw, 616 dma_addr_t buf_addr, size_t sg_used) 617 { 618 if (chan->ext_addr) { 619 hw->buf_addr = lower_32_bits(buf_addr + sg_used); 620 hw->buf_addr_msb = upper_32_bits(buf_addr + sg_used); 621 } else { 622 hw->buf_addr = buf_addr + sg_used; 623 } 624 } 625 626 /* ----------------------------------------------------------------------------- 627 * Descriptors and segments alloc and free 628 */ 629 630 /** 631 * xilinx_vdma_alloc_tx_segment - Allocate transaction segment 632 * @chan: Driver specific DMA channel 633 * 634 * Return: The allocated segment on success and NULL on failure. 635 */ 636 static struct xilinx_vdma_tx_segment * 637 xilinx_vdma_alloc_tx_segment(struct xilinx_dma_chan *chan) 638 { 639 struct xilinx_vdma_tx_segment *segment; 640 dma_addr_t phys; 641 642 segment = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &phys); 643 if (!segment) 644 return NULL; 645 646 segment->phys = phys; 647 648 return segment; 649 } 650 651 /** 652 * xilinx_cdma_alloc_tx_segment - Allocate transaction segment 653 * @chan: Driver specific DMA channel 654 * 655 * Return: The allocated segment on success and NULL on failure. 656 */ 657 static struct xilinx_cdma_tx_segment * 658 xilinx_cdma_alloc_tx_segment(struct xilinx_dma_chan *chan) 659 { 660 struct xilinx_cdma_tx_segment *segment; 661 dma_addr_t phys; 662 663 segment = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &phys); 664 if (!segment) 665 return NULL; 666 667 segment->phys = phys; 668 669 return segment; 670 } 671 672 /** 673 * xilinx_axidma_alloc_tx_segment - Allocate transaction segment 674 * @chan: Driver specific DMA channel 675 * 676 * Return: The allocated segment on success and NULL on failure. 677 */ 678 static struct xilinx_axidma_tx_segment * 679 xilinx_axidma_alloc_tx_segment(struct xilinx_dma_chan *chan) 680 { 681 struct xilinx_axidma_tx_segment *segment = NULL; 682 unsigned long flags; 683 684 spin_lock_irqsave(&chan->lock, flags); 685 if (!list_empty(&chan->free_seg_list)) { 686 segment = list_first_entry(&chan->free_seg_list, 687 struct xilinx_axidma_tx_segment, 688 node); 689 list_del(&segment->node); 690 } 691 spin_unlock_irqrestore(&chan->lock, flags); 692 693 if (!segment) 694 dev_dbg(chan->dev, "Could not find free tx segment\n"); 695 696 return segment; 697 } 698 699 /** 700 * xilinx_aximcdma_alloc_tx_segment - Allocate transaction segment 701 * @chan: Driver specific DMA channel 702 * 703 * Return: The allocated segment on success and NULL on failure. 704 */ 705 static struct xilinx_aximcdma_tx_segment * 706 xilinx_aximcdma_alloc_tx_segment(struct xilinx_dma_chan *chan) 707 { 708 struct xilinx_aximcdma_tx_segment *segment = NULL; 709 unsigned long flags; 710 711 spin_lock_irqsave(&chan->lock, flags); 712 if (!list_empty(&chan->free_seg_list)) { 713 segment = list_first_entry(&chan->free_seg_list, 714 struct xilinx_aximcdma_tx_segment, 715 node); 716 list_del(&segment->node); 717 } 718 spin_unlock_irqrestore(&chan->lock, flags); 719 720 return segment; 721 } 722 723 static void xilinx_dma_clean_hw_desc(struct xilinx_axidma_desc_hw *hw) 724 { 725 u32 next_desc = hw->next_desc; 726 u32 next_desc_msb = hw->next_desc_msb; 727 728 memset(hw, 0, sizeof(struct xilinx_axidma_desc_hw)); 729 730 hw->next_desc = next_desc; 731 hw->next_desc_msb = next_desc_msb; 732 } 733 734 static void xilinx_mcdma_clean_hw_desc(struct xilinx_aximcdma_desc_hw *hw) 735 { 736 u32 next_desc = hw->next_desc; 737 u32 next_desc_msb = hw->next_desc_msb; 738 739 memset(hw, 0, sizeof(struct xilinx_aximcdma_desc_hw)); 740 741 hw->next_desc = next_desc; 742 hw->next_desc_msb = next_desc_msb; 743 } 744 745 /** 746 * xilinx_dma_free_tx_segment - Free transaction segment 747 * @chan: Driver specific DMA channel 748 * @segment: DMA transaction segment 749 */ 750 static void xilinx_dma_free_tx_segment(struct xilinx_dma_chan *chan, 751 struct xilinx_axidma_tx_segment *segment) 752 { 753 xilinx_dma_clean_hw_desc(&segment->hw); 754 755 list_add_tail(&segment->node, &chan->free_seg_list); 756 } 757 758 /** 759 * xilinx_mcdma_free_tx_segment - Free transaction segment 760 * @chan: Driver specific DMA channel 761 * @segment: DMA transaction segment 762 */ 763 static void xilinx_mcdma_free_tx_segment(struct xilinx_dma_chan *chan, 764 struct xilinx_aximcdma_tx_segment * 765 segment) 766 { 767 xilinx_mcdma_clean_hw_desc(&segment->hw); 768 769 list_add_tail(&segment->node, &chan->free_seg_list); 770 } 771 772 /** 773 * xilinx_cdma_free_tx_segment - Free transaction segment 774 * @chan: Driver specific DMA channel 775 * @segment: DMA transaction segment 776 */ 777 static void xilinx_cdma_free_tx_segment(struct xilinx_dma_chan *chan, 778 struct xilinx_cdma_tx_segment *segment) 779 { 780 dma_pool_free(chan->desc_pool, segment, segment->phys); 781 } 782 783 /** 784 * xilinx_vdma_free_tx_segment - Free transaction segment 785 * @chan: Driver specific DMA channel 786 * @segment: DMA transaction segment 787 */ 788 static void xilinx_vdma_free_tx_segment(struct xilinx_dma_chan *chan, 789 struct xilinx_vdma_tx_segment *segment) 790 { 791 dma_pool_free(chan->desc_pool, segment, segment->phys); 792 } 793 794 /** 795 * xilinx_dma_alloc_tx_descriptor - Allocate transaction descriptor 796 * @chan: Driver specific DMA channel 797 * 798 * Return: The allocated descriptor on success and NULL on failure. 799 */ 800 static struct xilinx_dma_tx_descriptor * 801 xilinx_dma_alloc_tx_descriptor(struct xilinx_dma_chan *chan) 802 { 803 struct xilinx_dma_tx_descriptor *desc; 804 805 desc = kzalloc(sizeof(*desc), GFP_NOWAIT); 806 if (!desc) 807 return NULL; 808 809 INIT_LIST_HEAD(&desc->segments); 810 811 return desc; 812 } 813 814 /** 815 * xilinx_dma_free_tx_descriptor - Free transaction descriptor 816 * @chan: Driver specific DMA channel 817 * @desc: DMA transaction descriptor 818 */ 819 static void 820 xilinx_dma_free_tx_descriptor(struct xilinx_dma_chan *chan, 821 struct xilinx_dma_tx_descriptor *desc) 822 { 823 struct xilinx_vdma_tx_segment *segment, *next; 824 struct xilinx_cdma_tx_segment *cdma_segment, *cdma_next; 825 struct xilinx_axidma_tx_segment *axidma_segment, *axidma_next; 826 struct xilinx_aximcdma_tx_segment *aximcdma_segment, *aximcdma_next; 827 828 if (!desc) 829 return; 830 831 if (chan->xdev->dma_config->dmatype == XDMA_TYPE_VDMA) { 832 list_for_each_entry_safe(segment, next, &desc->segments, node) { 833 list_del(&segment->node); 834 xilinx_vdma_free_tx_segment(chan, segment); 835 } 836 } else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) { 837 list_for_each_entry_safe(cdma_segment, cdma_next, 838 &desc->segments, node) { 839 list_del(&cdma_segment->node); 840 xilinx_cdma_free_tx_segment(chan, cdma_segment); 841 } 842 } else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) { 843 list_for_each_entry_safe(axidma_segment, axidma_next, 844 &desc->segments, node) { 845 list_del(&axidma_segment->node); 846 xilinx_dma_free_tx_segment(chan, axidma_segment); 847 } 848 } else { 849 list_for_each_entry_safe(aximcdma_segment, aximcdma_next, 850 &desc->segments, node) { 851 list_del(&aximcdma_segment->node); 852 xilinx_mcdma_free_tx_segment(chan, aximcdma_segment); 853 } 854 } 855 856 kfree(desc); 857 } 858 859 /* Required functions */ 860 861 /** 862 * xilinx_dma_free_desc_list - Free descriptors list 863 * @chan: Driver specific DMA channel 864 * @list: List to parse and delete the descriptor 865 */ 866 static void xilinx_dma_free_desc_list(struct xilinx_dma_chan *chan, 867 struct list_head *list) 868 { 869 struct xilinx_dma_tx_descriptor *desc, *next; 870 871 list_for_each_entry_safe(desc, next, list, node) { 872 list_del(&desc->node); 873 xilinx_dma_free_tx_descriptor(chan, desc); 874 } 875 } 876 877 /** 878 * xilinx_dma_free_descriptors - Free channel descriptors 879 * @chan: Driver specific DMA channel 880 */ 881 static void xilinx_dma_free_descriptors(struct xilinx_dma_chan *chan) 882 { 883 unsigned long flags; 884 885 spin_lock_irqsave(&chan->lock, flags); 886 887 xilinx_dma_free_desc_list(chan, &chan->pending_list); 888 xilinx_dma_free_desc_list(chan, &chan->done_list); 889 xilinx_dma_free_desc_list(chan, &chan->active_list); 890 891 spin_unlock_irqrestore(&chan->lock, flags); 892 } 893 894 /** 895 * xilinx_dma_free_chan_resources - Free channel resources 896 * @dchan: DMA channel 897 */ 898 static void xilinx_dma_free_chan_resources(struct dma_chan *dchan) 899 { 900 struct xilinx_dma_chan *chan = to_xilinx_chan(dchan); 901 unsigned long flags; 902 903 dev_dbg(chan->dev, "Free all channel resources.\n"); 904 905 xilinx_dma_free_descriptors(chan); 906 907 if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) { 908 spin_lock_irqsave(&chan->lock, flags); 909 INIT_LIST_HEAD(&chan->free_seg_list); 910 spin_unlock_irqrestore(&chan->lock, flags); 911 912 /* Free memory that is allocated for BD */ 913 dma_free_coherent(chan->dev, sizeof(*chan->seg_v) * 914 XILINX_DMA_NUM_DESCS, chan->seg_v, 915 chan->seg_p); 916 917 /* Free Memory that is allocated for cyclic DMA Mode */ 918 dma_free_coherent(chan->dev, sizeof(*chan->cyclic_seg_v), 919 chan->cyclic_seg_v, chan->cyclic_seg_p); 920 } 921 922 if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA) { 923 spin_lock_irqsave(&chan->lock, flags); 924 INIT_LIST_HEAD(&chan->free_seg_list); 925 spin_unlock_irqrestore(&chan->lock, flags); 926 927 /* Free memory that is allocated for BD */ 928 dma_free_coherent(chan->dev, sizeof(*chan->seg_mv) * 929 XILINX_DMA_NUM_DESCS, chan->seg_mv, 930 chan->seg_p); 931 } 932 933 if (chan->xdev->dma_config->dmatype != XDMA_TYPE_AXIDMA && 934 chan->xdev->dma_config->dmatype != XDMA_TYPE_AXIMCDMA) { 935 dma_pool_destroy(chan->desc_pool); 936 chan->desc_pool = NULL; 937 } 938 939 } 940 941 /** 942 * xilinx_dma_get_residue - Compute residue for a given descriptor 943 * @chan: Driver specific dma channel 944 * @desc: dma transaction descriptor 945 * 946 * Return: The number of residue bytes for the descriptor. 947 */ 948 static u32 xilinx_dma_get_residue(struct xilinx_dma_chan *chan, 949 struct xilinx_dma_tx_descriptor *desc) 950 { 951 struct xilinx_cdma_tx_segment *cdma_seg; 952 struct xilinx_axidma_tx_segment *axidma_seg; 953 struct xilinx_aximcdma_tx_segment *aximcdma_seg; 954 struct xilinx_cdma_desc_hw *cdma_hw; 955 struct xilinx_axidma_desc_hw *axidma_hw; 956 struct xilinx_aximcdma_desc_hw *aximcdma_hw; 957 struct list_head *entry; 958 u32 residue = 0; 959 960 list_for_each(entry, &desc->segments) { 961 if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) { 962 cdma_seg = list_entry(entry, 963 struct xilinx_cdma_tx_segment, 964 node); 965 cdma_hw = &cdma_seg->hw; 966 residue += (cdma_hw->control - cdma_hw->status) & 967 chan->xdev->max_buffer_len; 968 } else if (chan->xdev->dma_config->dmatype == 969 XDMA_TYPE_AXIDMA) { 970 axidma_seg = list_entry(entry, 971 struct xilinx_axidma_tx_segment, 972 node); 973 axidma_hw = &axidma_seg->hw; 974 residue += (axidma_hw->control - axidma_hw->status) & 975 chan->xdev->max_buffer_len; 976 } else { 977 aximcdma_seg = 978 list_entry(entry, 979 struct xilinx_aximcdma_tx_segment, 980 node); 981 aximcdma_hw = &aximcdma_seg->hw; 982 residue += 983 (aximcdma_hw->control - aximcdma_hw->status) & 984 chan->xdev->max_buffer_len; 985 } 986 } 987 988 return residue; 989 } 990 991 /** 992 * xilinx_dma_chan_handle_cyclic - Cyclic dma callback 993 * @chan: Driver specific dma channel 994 * @desc: dma transaction descriptor 995 * @flags: flags for spin lock 996 */ 997 static void xilinx_dma_chan_handle_cyclic(struct xilinx_dma_chan *chan, 998 struct xilinx_dma_tx_descriptor *desc, 999 unsigned long *flags) 1000 { 1001 struct dmaengine_desc_callback cb; 1002 1003 dmaengine_desc_get_callback(&desc->async_tx, &cb); 1004 if (dmaengine_desc_callback_valid(&cb)) { 1005 spin_unlock_irqrestore(&chan->lock, *flags); 1006 dmaengine_desc_callback_invoke(&cb, NULL); 1007 spin_lock_irqsave(&chan->lock, *flags); 1008 } 1009 } 1010 1011 /** 1012 * xilinx_dma_chan_desc_cleanup - Clean channel descriptors 1013 * @chan: Driver specific DMA channel 1014 */ 1015 static void xilinx_dma_chan_desc_cleanup(struct xilinx_dma_chan *chan) 1016 { 1017 struct xilinx_dma_tx_descriptor *desc, *next; 1018 unsigned long flags; 1019 1020 spin_lock_irqsave(&chan->lock, flags); 1021 1022 list_for_each_entry_safe(desc, next, &chan->done_list, node) { 1023 struct dmaengine_result result; 1024 1025 if (desc->cyclic) { 1026 xilinx_dma_chan_handle_cyclic(chan, desc, &flags); 1027 break; 1028 } 1029 1030 /* Remove from the list of running transactions */ 1031 list_del(&desc->node); 1032 1033 if (unlikely(desc->err)) { 1034 if (chan->direction == DMA_DEV_TO_MEM) 1035 result.result = DMA_TRANS_READ_FAILED; 1036 else 1037 result.result = DMA_TRANS_WRITE_FAILED; 1038 } else { 1039 result.result = DMA_TRANS_NOERROR; 1040 } 1041 1042 result.residue = desc->residue; 1043 1044 /* Run the link descriptor callback function */ 1045 spin_unlock_irqrestore(&chan->lock, flags); 1046 dmaengine_desc_get_callback_invoke(&desc->async_tx, &result); 1047 spin_lock_irqsave(&chan->lock, flags); 1048 1049 /* Run any dependencies, then free the descriptor */ 1050 dma_run_dependencies(&desc->async_tx); 1051 xilinx_dma_free_tx_descriptor(chan, desc); 1052 1053 /* 1054 * While we ran a callback the user called a terminate function, 1055 * which takes care of cleaning up any remaining descriptors 1056 */ 1057 if (chan->terminating) 1058 break; 1059 } 1060 1061 spin_unlock_irqrestore(&chan->lock, flags); 1062 } 1063 1064 /** 1065 * xilinx_dma_do_tasklet - Schedule completion tasklet 1066 * @t: Pointer to the Xilinx DMA channel structure 1067 */ 1068 static void xilinx_dma_do_tasklet(struct tasklet_struct *t) 1069 { 1070 struct xilinx_dma_chan *chan = from_tasklet(chan, t, tasklet); 1071 1072 xilinx_dma_chan_desc_cleanup(chan); 1073 } 1074 1075 /** 1076 * xilinx_dma_alloc_chan_resources - Allocate channel resources 1077 * @dchan: DMA channel 1078 * 1079 * Return: '0' on success and failure value on error 1080 */ 1081 static int xilinx_dma_alloc_chan_resources(struct dma_chan *dchan) 1082 { 1083 struct xilinx_dma_chan *chan = to_xilinx_chan(dchan); 1084 int i; 1085 1086 /* Has this channel already been allocated? */ 1087 if (chan->desc_pool) 1088 return 0; 1089 1090 /* 1091 * We need the descriptor to be aligned to 64bytes 1092 * for meeting Xilinx VDMA specification requirement. 1093 */ 1094 if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) { 1095 /* Allocate the buffer descriptors. */ 1096 chan->seg_v = dma_alloc_coherent(chan->dev, 1097 sizeof(*chan->seg_v) * XILINX_DMA_NUM_DESCS, 1098 &chan->seg_p, GFP_KERNEL); 1099 if (!chan->seg_v) { 1100 dev_err(chan->dev, 1101 "unable to allocate channel %d descriptors\n", 1102 chan->id); 1103 return -ENOMEM; 1104 } 1105 /* 1106 * For cyclic DMA mode we need to program the tail Descriptor 1107 * register with a value which is not a part of the BD chain 1108 * so allocating a desc segment during channel allocation for 1109 * programming tail descriptor. 1110 */ 1111 chan->cyclic_seg_v = dma_alloc_coherent(chan->dev, 1112 sizeof(*chan->cyclic_seg_v), 1113 &chan->cyclic_seg_p, 1114 GFP_KERNEL); 1115 if (!chan->cyclic_seg_v) { 1116 dev_err(chan->dev, 1117 "unable to allocate desc segment for cyclic DMA\n"); 1118 dma_free_coherent(chan->dev, sizeof(*chan->seg_v) * 1119 XILINX_DMA_NUM_DESCS, chan->seg_v, 1120 chan->seg_p); 1121 return -ENOMEM; 1122 } 1123 chan->cyclic_seg_v->phys = chan->cyclic_seg_p; 1124 1125 for (i = 0; i < XILINX_DMA_NUM_DESCS; i++) { 1126 chan->seg_v[i].hw.next_desc = 1127 lower_32_bits(chan->seg_p + sizeof(*chan->seg_v) * 1128 ((i + 1) % XILINX_DMA_NUM_DESCS)); 1129 chan->seg_v[i].hw.next_desc_msb = 1130 upper_32_bits(chan->seg_p + sizeof(*chan->seg_v) * 1131 ((i + 1) % XILINX_DMA_NUM_DESCS)); 1132 chan->seg_v[i].phys = chan->seg_p + 1133 sizeof(*chan->seg_v) * i; 1134 list_add_tail(&chan->seg_v[i].node, 1135 &chan->free_seg_list); 1136 } 1137 } else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA) { 1138 /* Allocate the buffer descriptors. */ 1139 chan->seg_mv = dma_alloc_coherent(chan->dev, 1140 sizeof(*chan->seg_mv) * 1141 XILINX_DMA_NUM_DESCS, 1142 &chan->seg_p, GFP_KERNEL); 1143 if (!chan->seg_mv) { 1144 dev_err(chan->dev, 1145 "unable to allocate channel %d descriptors\n", 1146 chan->id); 1147 return -ENOMEM; 1148 } 1149 for (i = 0; i < XILINX_DMA_NUM_DESCS; i++) { 1150 chan->seg_mv[i].hw.next_desc = 1151 lower_32_bits(chan->seg_p + sizeof(*chan->seg_mv) * 1152 ((i + 1) % XILINX_DMA_NUM_DESCS)); 1153 chan->seg_mv[i].hw.next_desc_msb = 1154 upper_32_bits(chan->seg_p + sizeof(*chan->seg_mv) * 1155 ((i + 1) % XILINX_DMA_NUM_DESCS)); 1156 chan->seg_mv[i].phys = chan->seg_p + 1157 sizeof(*chan->seg_mv) * i; 1158 list_add_tail(&chan->seg_mv[i].node, 1159 &chan->free_seg_list); 1160 } 1161 } else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) { 1162 chan->desc_pool = dma_pool_create("xilinx_cdma_desc_pool", 1163 chan->dev, 1164 sizeof(struct xilinx_cdma_tx_segment), 1165 __alignof__(struct xilinx_cdma_tx_segment), 1166 0); 1167 } else { 1168 chan->desc_pool = dma_pool_create("xilinx_vdma_desc_pool", 1169 chan->dev, 1170 sizeof(struct xilinx_vdma_tx_segment), 1171 __alignof__(struct xilinx_vdma_tx_segment), 1172 0); 1173 } 1174 1175 if (!chan->desc_pool && 1176 ((chan->xdev->dma_config->dmatype != XDMA_TYPE_AXIDMA) && 1177 chan->xdev->dma_config->dmatype != XDMA_TYPE_AXIMCDMA)) { 1178 dev_err(chan->dev, 1179 "unable to allocate channel %d descriptor pool\n", 1180 chan->id); 1181 return -ENOMEM; 1182 } 1183 1184 dma_cookie_init(dchan); 1185 1186 if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) { 1187 /* For AXI DMA resetting once channel will reset the 1188 * other channel as well so enable the interrupts here. 1189 */ 1190 dma_ctrl_set(chan, XILINX_DMA_REG_DMACR, 1191 XILINX_DMA_DMAXR_ALL_IRQ_MASK); 1192 } 1193 1194 if ((chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) && chan->has_sg) 1195 dma_ctrl_set(chan, XILINX_DMA_REG_DMACR, 1196 XILINX_CDMA_CR_SGMODE); 1197 1198 return 0; 1199 } 1200 1201 /** 1202 * xilinx_dma_calc_copysize - Calculate the amount of data to copy 1203 * @chan: Driver specific DMA channel 1204 * @size: Total data that needs to be copied 1205 * @done: Amount of data that has been already copied 1206 * 1207 * Return: Amount of data that has to be copied 1208 */ 1209 static int xilinx_dma_calc_copysize(struct xilinx_dma_chan *chan, 1210 int size, int done) 1211 { 1212 size_t copy; 1213 1214 copy = min_t(size_t, size - done, 1215 chan->xdev->max_buffer_len); 1216 1217 if ((copy + done < size) && 1218 chan->xdev->common.copy_align) { 1219 /* 1220 * If this is not the last descriptor, make sure 1221 * the next one will be properly aligned 1222 */ 1223 copy = rounddown(copy, 1224 (1 << chan->xdev->common.copy_align)); 1225 } 1226 return copy; 1227 } 1228 1229 /** 1230 * xilinx_dma_tx_status - Get DMA transaction status 1231 * @dchan: DMA channel 1232 * @cookie: Transaction identifier 1233 * @txstate: Transaction state 1234 * 1235 * Return: DMA transaction status 1236 */ 1237 static enum dma_status xilinx_dma_tx_status(struct dma_chan *dchan, 1238 dma_cookie_t cookie, 1239 struct dma_tx_state *txstate) 1240 { 1241 struct xilinx_dma_chan *chan = to_xilinx_chan(dchan); 1242 struct xilinx_dma_tx_descriptor *desc; 1243 enum dma_status ret; 1244 unsigned long flags; 1245 u32 residue = 0; 1246 1247 ret = dma_cookie_status(dchan, cookie, txstate); 1248 if (ret == DMA_COMPLETE || !txstate) 1249 return ret; 1250 1251 spin_lock_irqsave(&chan->lock, flags); 1252 if (!list_empty(&chan->active_list)) { 1253 desc = list_last_entry(&chan->active_list, 1254 struct xilinx_dma_tx_descriptor, node); 1255 /* 1256 * VDMA and simple mode do not support residue reporting, so the 1257 * residue field will always be 0. 1258 */ 1259 if (chan->has_sg && chan->xdev->dma_config->dmatype != XDMA_TYPE_VDMA) 1260 residue = xilinx_dma_get_residue(chan, desc); 1261 } 1262 spin_unlock_irqrestore(&chan->lock, flags); 1263 1264 dma_set_residue(txstate, residue); 1265 1266 return ret; 1267 } 1268 1269 /** 1270 * xilinx_dma_stop_transfer - Halt DMA channel 1271 * @chan: Driver specific DMA channel 1272 * 1273 * Return: '0' on success and failure value on error 1274 */ 1275 static int xilinx_dma_stop_transfer(struct xilinx_dma_chan *chan) 1276 { 1277 u32 val; 1278 1279 dma_ctrl_clr(chan, XILINX_DMA_REG_DMACR, XILINX_DMA_DMACR_RUNSTOP); 1280 1281 /* Wait for the hardware to halt */ 1282 return xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMASR, val, 1283 val & XILINX_DMA_DMASR_HALTED, 0, 1284 XILINX_DMA_LOOP_COUNT); 1285 } 1286 1287 /** 1288 * xilinx_cdma_stop_transfer - Wait for the current transfer to complete 1289 * @chan: Driver specific DMA channel 1290 * 1291 * Return: '0' on success and failure value on error 1292 */ 1293 static int xilinx_cdma_stop_transfer(struct xilinx_dma_chan *chan) 1294 { 1295 u32 val; 1296 1297 return xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMASR, val, 1298 val & XILINX_DMA_DMASR_IDLE, 0, 1299 XILINX_DMA_LOOP_COUNT); 1300 } 1301 1302 /** 1303 * xilinx_dma_start - Start DMA channel 1304 * @chan: Driver specific DMA channel 1305 */ 1306 static void xilinx_dma_start(struct xilinx_dma_chan *chan) 1307 { 1308 int err; 1309 u32 val; 1310 1311 dma_ctrl_set(chan, XILINX_DMA_REG_DMACR, XILINX_DMA_DMACR_RUNSTOP); 1312 1313 /* Wait for the hardware to start */ 1314 err = xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMASR, val, 1315 !(val & XILINX_DMA_DMASR_HALTED), 0, 1316 XILINX_DMA_LOOP_COUNT); 1317 1318 if (err) { 1319 dev_err(chan->dev, "Cannot start channel %p: %x\n", 1320 chan, dma_ctrl_read(chan, XILINX_DMA_REG_DMASR)); 1321 1322 chan->err = true; 1323 } 1324 } 1325 1326 /** 1327 * xilinx_vdma_start_transfer - Starts VDMA transfer 1328 * @chan: Driver specific channel struct pointer 1329 */ 1330 static void xilinx_vdma_start_transfer(struct xilinx_dma_chan *chan) 1331 { 1332 struct xilinx_vdma_config *config = &chan->config; 1333 struct xilinx_dma_tx_descriptor *desc; 1334 u32 reg, j; 1335 struct xilinx_vdma_tx_segment *segment, *last = NULL; 1336 int i = 0; 1337 1338 /* This function was invoked with lock held */ 1339 if (chan->err) 1340 return; 1341 1342 if (!chan->idle) 1343 return; 1344 1345 if (list_empty(&chan->pending_list)) 1346 return; 1347 1348 desc = list_first_entry(&chan->pending_list, 1349 struct xilinx_dma_tx_descriptor, node); 1350 1351 /* Configure the hardware using info in the config structure */ 1352 if (chan->has_vflip) { 1353 reg = dma_read(chan, XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP); 1354 reg &= ~XILINX_VDMA_ENABLE_VERTICAL_FLIP; 1355 reg |= config->vflip_en; 1356 dma_write(chan, XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP, 1357 reg); 1358 } 1359 1360 reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR); 1361 1362 if (config->frm_cnt_en) 1363 reg |= XILINX_DMA_DMACR_FRAMECNT_EN; 1364 else 1365 reg &= ~XILINX_DMA_DMACR_FRAMECNT_EN; 1366 1367 /* If not parking, enable circular mode */ 1368 if (config->park) 1369 reg &= ~XILINX_DMA_DMACR_CIRC_EN; 1370 else 1371 reg |= XILINX_DMA_DMACR_CIRC_EN; 1372 1373 dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg); 1374 1375 j = chan->desc_submitcount; 1376 reg = dma_read(chan, XILINX_DMA_REG_PARK_PTR); 1377 if (chan->direction == DMA_MEM_TO_DEV) { 1378 reg &= ~XILINX_DMA_PARK_PTR_RD_REF_MASK; 1379 reg |= j << XILINX_DMA_PARK_PTR_RD_REF_SHIFT; 1380 } else { 1381 reg &= ~XILINX_DMA_PARK_PTR_WR_REF_MASK; 1382 reg |= j << XILINX_DMA_PARK_PTR_WR_REF_SHIFT; 1383 } 1384 dma_write(chan, XILINX_DMA_REG_PARK_PTR, reg); 1385 1386 /* Start the hardware */ 1387 xilinx_dma_start(chan); 1388 1389 if (chan->err) 1390 return; 1391 1392 /* Start the transfer */ 1393 if (chan->desc_submitcount < chan->num_frms) 1394 i = chan->desc_submitcount; 1395 1396 list_for_each_entry(segment, &desc->segments, node) { 1397 if (chan->ext_addr) 1398 vdma_desc_write_64(chan, 1399 XILINX_VDMA_REG_START_ADDRESS_64(i++), 1400 segment->hw.buf_addr, 1401 segment->hw.buf_addr_msb); 1402 else 1403 vdma_desc_write(chan, 1404 XILINX_VDMA_REG_START_ADDRESS(i++), 1405 segment->hw.buf_addr); 1406 1407 last = segment; 1408 } 1409 1410 if (!last) 1411 return; 1412 1413 /* HW expects these parameters to be same for one transaction */ 1414 vdma_desc_write(chan, XILINX_DMA_REG_HSIZE, last->hw.hsize); 1415 vdma_desc_write(chan, XILINX_DMA_REG_FRMDLY_STRIDE, 1416 last->hw.stride); 1417 vdma_desc_write(chan, XILINX_DMA_REG_VSIZE, last->hw.vsize); 1418 1419 chan->desc_submitcount++; 1420 chan->desc_pendingcount--; 1421 list_move_tail(&desc->node, &chan->active_list); 1422 if (chan->desc_submitcount == chan->num_frms) 1423 chan->desc_submitcount = 0; 1424 1425 chan->idle = false; 1426 } 1427 1428 /** 1429 * xilinx_cdma_start_transfer - Starts cdma transfer 1430 * @chan: Driver specific channel struct pointer 1431 */ 1432 static void xilinx_cdma_start_transfer(struct xilinx_dma_chan *chan) 1433 { 1434 struct xilinx_dma_tx_descriptor *head_desc, *tail_desc; 1435 struct xilinx_cdma_tx_segment *tail_segment; 1436 u32 ctrl_reg = dma_read(chan, XILINX_DMA_REG_DMACR); 1437 1438 if (chan->err) 1439 return; 1440 1441 if (!chan->idle) 1442 return; 1443 1444 if (list_empty(&chan->pending_list)) 1445 return; 1446 1447 head_desc = list_first_entry(&chan->pending_list, 1448 struct xilinx_dma_tx_descriptor, node); 1449 tail_desc = list_last_entry(&chan->pending_list, 1450 struct xilinx_dma_tx_descriptor, node); 1451 tail_segment = list_last_entry(&tail_desc->segments, 1452 struct xilinx_cdma_tx_segment, node); 1453 1454 if (chan->desc_pendingcount <= XILINX_DMA_COALESCE_MAX) { 1455 ctrl_reg &= ~XILINX_DMA_CR_COALESCE_MAX; 1456 ctrl_reg |= chan->desc_pendingcount << 1457 XILINX_DMA_CR_COALESCE_SHIFT; 1458 dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, ctrl_reg); 1459 } 1460 1461 if (chan->has_sg) { 1462 dma_ctrl_clr(chan, XILINX_DMA_REG_DMACR, 1463 XILINX_CDMA_CR_SGMODE); 1464 1465 dma_ctrl_set(chan, XILINX_DMA_REG_DMACR, 1466 XILINX_CDMA_CR_SGMODE); 1467 1468 xilinx_write(chan, XILINX_DMA_REG_CURDESC, 1469 head_desc->async_tx.phys); 1470 1471 /* Update tail ptr register which will start the transfer */ 1472 xilinx_write(chan, XILINX_DMA_REG_TAILDESC, 1473 tail_segment->phys); 1474 } else { 1475 /* In simple mode */ 1476 struct xilinx_cdma_tx_segment *segment; 1477 struct xilinx_cdma_desc_hw *hw; 1478 1479 segment = list_first_entry(&head_desc->segments, 1480 struct xilinx_cdma_tx_segment, 1481 node); 1482 1483 hw = &segment->hw; 1484 1485 xilinx_write(chan, XILINX_CDMA_REG_SRCADDR, 1486 xilinx_prep_dma_addr_t(hw->src_addr)); 1487 xilinx_write(chan, XILINX_CDMA_REG_DSTADDR, 1488 xilinx_prep_dma_addr_t(hw->dest_addr)); 1489 1490 /* Start the transfer */ 1491 dma_ctrl_write(chan, XILINX_DMA_REG_BTT, 1492 hw->control & chan->xdev->max_buffer_len); 1493 } 1494 1495 list_splice_tail_init(&chan->pending_list, &chan->active_list); 1496 chan->desc_pendingcount = 0; 1497 chan->idle = false; 1498 } 1499 1500 /** 1501 * xilinx_dma_start_transfer - Starts DMA transfer 1502 * @chan: Driver specific channel struct pointer 1503 */ 1504 static void xilinx_dma_start_transfer(struct xilinx_dma_chan *chan) 1505 { 1506 struct xilinx_dma_tx_descriptor *head_desc, *tail_desc; 1507 struct xilinx_axidma_tx_segment *tail_segment; 1508 u32 reg; 1509 1510 if (chan->err) 1511 return; 1512 1513 if (list_empty(&chan->pending_list)) 1514 return; 1515 1516 if (!chan->idle) 1517 return; 1518 1519 head_desc = list_first_entry(&chan->pending_list, 1520 struct xilinx_dma_tx_descriptor, node); 1521 tail_desc = list_last_entry(&chan->pending_list, 1522 struct xilinx_dma_tx_descriptor, node); 1523 tail_segment = list_last_entry(&tail_desc->segments, 1524 struct xilinx_axidma_tx_segment, node); 1525 1526 reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR); 1527 1528 if (chan->desc_pendingcount <= XILINX_DMA_COALESCE_MAX) { 1529 reg &= ~XILINX_DMA_CR_COALESCE_MAX; 1530 reg |= chan->desc_pendingcount << 1531 XILINX_DMA_CR_COALESCE_SHIFT; 1532 dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg); 1533 } 1534 1535 if (chan->has_sg) 1536 xilinx_write(chan, XILINX_DMA_REG_CURDESC, 1537 head_desc->async_tx.phys); 1538 1539 xilinx_dma_start(chan); 1540 1541 if (chan->err) 1542 return; 1543 1544 /* Start the transfer */ 1545 if (chan->has_sg) { 1546 if (chan->cyclic) 1547 xilinx_write(chan, XILINX_DMA_REG_TAILDESC, 1548 chan->cyclic_seg_v->phys); 1549 else 1550 xilinx_write(chan, XILINX_DMA_REG_TAILDESC, 1551 tail_segment->phys); 1552 } else { 1553 struct xilinx_axidma_tx_segment *segment; 1554 struct xilinx_axidma_desc_hw *hw; 1555 1556 segment = list_first_entry(&head_desc->segments, 1557 struct xilinx_axidma_tx_segment, 1558 node); 1559 hw = &segment->hw; 1560 1561 xilinx_write(chan, XILINX_DMA_REG_SRCDSTADDR, 1562 xilinx_prep_dma_addr_t(hw->buf_addr)); 1563 1564 /* Start the transfer */ 1565 dma_ctrl_write(chan, XILINX_DMA_REG_BTT, 1566 hw->control & chan->xdev->max_buffer_len); 1567 } 1568 1569 list_splice_tail_init(&chan->pending_list, &chan->active_list); 1570 chan->desc_pendingcount = 0; 1571 chan->idle = false; 1572 } 1573 1574 /** 1575 * xilinx_mcdma_start_transfer - Starts MCDMA transfer 1576 * @chan: Driver specific channel struct pointer 1577 */ 1578 static void xilinx_mcdma_start_transfer(struct xilinx_dma_chan *chan) 1579 { 1580 struct xilinx_dma_tx_descriptor *head_desc, *tail_desc; 1581 struct xilinx_aximcdma_tx_segment *tail_segment; 1582 u32 reg; 1583 1584 /* 1585 * lock has been held by calling functions, so we don't need it 1586 * to take it here again. 1587 */ 1588 1589 if (chan->err) 1590 return; 1591 1592 if (!chan->idle) 1593 return; 1594 1595 if (list_empty(&chan->pending_list)) 1596 return; 1597 1598 head_desc = list_first_entry(&chan->pending_list, 1599 struct xilinx_dma_tx_descriptor, node); 1600 tail_desc = list_last_entry(&chan->pending_list, 1601 struct xilinx_dma_tx_descriptor, node); 1602 tail_segment = list_last_entry(&tail_desc->segments, 1603 struct xilinx_aximcdma_tx_segment, node); 1604 1605 reg = dma_ctrl_read(chan, XILINX_MCDMA_CHAN_CR_OFFSET(chan->tdest)); 1606 1607 if (chan->desc_pendingcount <= XILINX_MCDMA_COALESCE_MAX) { 1608 reg &= ~XILINX_MCDMA_COALESCE_MASK; 1609 reg |= chan->desc_pendingcount << 1610 XILINX_MCDMA_COALESCE_SHIFT; 1611 } 1612 1613 reg |= XILINX_MCDMA_IRQ_ALL_MASK; 1614 dma_ctrl_write(chan, XILINX_MCDMA_CHAN_CR_OFFSET(chan->tdest), reg); 1615 1616 /* Program current descriptor */ 1617 xilinx_write(chan, XILINX_MCDMA_CHAN_CDESC_OFFSET(chan->tdest), 1618 head_desc->async_tx.phys); 1619 1620 /* Program channel enable register */ 1621 reg = dma_ctrl_read(chan, XILINX_MCDMA_CHEN_OFFSET); 1622 reg |= BIT(chan->tdest); 1623 dma_ctrl_write(chan, XILINX_MCDMA_CHEN_OFFSET, reg); 1624 1625 /* Start the fetch of BDs for the channel */ 1626 reg = dma_ctrl_read(chan, XILINX_MCDMA_CHAN_CR_OFFSET(chan->tdest)); 1627 reg |= XILINX_MCDMA_CR_RUNSTOP_MASK; 1628 dma_ctrl_write(chan, XILINX_MCDMA_CHAN_CR_OFFSET(chan->tdest), reg); 1629 1630 xilinx_dma_start(chan); 1631 1632 if (chan->err) 1633 return; 1634 1635 /* Start the transfer */ 1636 xilinx_write(chan, XILINX_MCDMA_CHAN_TDESC_OFFSET(chan->tdest), 1637 tail_segment->phys); 1638 1639 list_splice_tail_init(&chan->pending_list, &chan->active_list); 1640 chan->desc_pendingcount = 0; 1641 chan->idle = false; 1642 } 1643 1644 /** 1645 * xilinx_dma_issue_pending - Issue pending transactions 1646 * @dchan: DMA channel 1647 */ 1648 static void xilinx_dma_issue_pending(struct dma_chan *dchan) 1649 { 1650 struct xilinx_dma_chan *chan = to_xilinx_chan(dchan); 1651 unsigned long flags; 1652 1653 spin_lock_irqsave(&chan->lock, flags); 1654 chan->start_transfer(chan); 1655 spin_unlock_irqrestore(&chan->lock, flags); 1656 } 1657 1658 /** 1659 * xilinx_dma_device_config - Configure the DMA channel 1660 * @dchan: DMA channel 1661 * @config: channel configuration 1662 * 1663 * Return: 0 always. 1664 */ 1665 static int xilinx_dma_device_config(struct dma_chan *dchan, 1666 struct dma_slave_config *config) 1667 { 1668 return 0; 1669 } 1670 1671 /** 1672 * xilinx_dma_complete_descriptor - Mark the active descriptor as complete 1673 * @chan : xilinx DMA channel 1674 * 1675 * CONTEXT: hardirq 1676 */ 1677 static void xilinx_dma_complete_descriptor(struct xilinx_dma_chan *chan) 1678 { 1679 struct xilinx_dma_tx_descriptor *desc, *next; 1680 1681 /* This function was invoked with lock held */ 1682 if (list_empty(&chan->active_list)) 1683 return; 1684 1685 list_for_each_entry_safe(desc, next, &chan->active_list, node) { 1686 if (chan->has_sg && chan->xdev->dma_config->dmatype != 1687 XDMA_TYPE_VDMA) 1688 desc->residue = xilinx_dma_get_residue(chan, desc); 1689 else 1690 desc->residue = 0; 1691 desc->err = chan->err; 1692 1693 list_del(&desc->node); 1694 if (!desc->cyclic) 1695 dma_cookie_complete(&desc->async_tx); 1696 list_add_tail(&desc->node, &chan->done_list); 1697 } 1698 } 1699 1700 /** 1701 * xilinx_dma_reset - Reset DMA channel 1702 * @chan: Driver specific DMA channel 1703 * 1704 * Return: '0' on success and failure value on error 1705 */ 1706 static int xilinx_dma_reset(struct xilinx_dma_chan *chan) 1707 { 1708 int err; 1709 u32 tmp; 1710 1711 dma_ctrl_set(chan, XILINX_DMA_REG_DMACR, XILINX_DMA_DMACR_RESET); 1712 1713 /* Wait for the hardware to finish reset */ 1714 err = xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMACR, tmp, 1715 !(tmp & XILINX_DMA_DMACR_RESET), 0, 1716 XILINX_DMA_LOOP_COUNT); 1717 1718 if (err) { 1719 dev_err(chan->dev, "reset timeout, cr %x, sr %x\n", 1720 dma_ctrl_read(chan, XILINX_DMA_REG_DMACR), 1721 dma_ctrl_read(chan, XILINX_DMA_REG_DMASR)); 1722 return -ETIMEDOUT; 1723 } 1724 1725 chan->err = false; 1726 chan->idle = true; 1727 chan->desc_pendingcount = 0; 1728 chan->desc_submitcount = 0; 1729 1730 return err; 1731 } 1732 1733 /** 1734 * xilinx_dma_chan_reset - Reset DMA channel and enable interrupts 1735 * @chan: Driver specific DMA channel 1736 * 1737 * Return: '0' on success and failure value on error 1738 */ 1739 static int xilinx_dma_chan_reset(struct xilinx_dma_chan *chan) 1740 { 1741 int err; 1742 1743 /* Reset VDMA */ 1744 err = xilinx_dma_reset(chan); 1745 if (err) 1746 return err; 1747 1748 /* Enable interrupts */ 1749 dma_ctrl_set(chan, XILINX_DMA_REG_DMACR, 1750 XILINX_DMA_DMAXR_ALL_IRQ_MASK); 1751 1752 return 0; 1753 } 1754 1755 /** 1756 * xilinx_mcdma_irq_handler - MCDMA Interrupt handler 1757 * @irq: IRQ number 1758 * @data: Pointer to the Xilinx MCDMA channel structure 1759 * 1760 * Return: IRQ_HANDLED/IRQ_NONE 1761 */ 1762 static irqreturn_t xilinx_mcdma_irq_handler(int irq, void *data) 1763 { 1764 struct xilinx_dma_chan *chan = data; 1765 u32 status, ser_offset, chan_sermask, chan_offset = 0, chan_id; 1766 1767 if (chan->direction == DMA_DEV_TO_MEM) 1768 ser_offset = XILINX_MCDMA_RXINT_SER_OFFSET; 1769 else 1770 ser_offset = XILINX_MCDMA_TXINT_SER_OFFSET; 1771 1772 /* Read the channel id raising the interrupt*/ 1773 chan_sermask = dma_ctrl_read(chan, ser_offset); 1774 chan_id = ffs(chan_sermask); 1775 1776 if (!chan_id) 1777 return IRQ_NONE; 1778 1779 if (chan->direction == DMA_DEV_TO_MEM) 1780 chan_offset = chan->xdev->dma_config->max_channels / 2; 1781 1782 chan_offset = chan_offset + (chan_id - 1); 1783 chan = chan->xdev->chan[chan_offset]; 1784 /* Read the status and ack the interrupts. */ 1785 status = dma_ctrl_read(chan, XILINX_MCDMA_CHAN_SR_OFFSET(chan->tdest)); 1786 if (!(status & XILINX_MCDMA_IRQ_ALL_MASK)) 1787 return IRQ_NONE; 1788 1789 dma_ctrl_write(chan, XILINX_MCDMA_CHAN_SR_OFFSET(chan->tdest), 1790 status & XILINX_MCDMA_IRQ_ALL_MASK); 1791 1792 if (status & XILINX_MCDMA_IRQ_ERR_MASK) { 1793 dev_err(chan->dev, "Channel %p has errors %x cdr %x tdr %x\n", 1794 chan, 1795 dma_ctrl_read(chan, XILINX_MCDMA_CH_ERR_OFFSET), 1796 dma_ctrl_read(chan, XILINX_MCDMA_CHAN_CDESC_OFFSET 1797 (chan->tdest)), 1798 dma_ctrl_read(chan, XILINX_MCDMA_CHAN_TDESC_OFFSET 1799 (chan->tdest))); 1800 chan->err = true; 1801 } 1802 1803 if (status & XILINX_MCDMA_IRQ_DELAY_MASK) { 1804 /* 1805 * Device takes too long to do the transfer when user requires 1806 * responsiveness. 1807 */ 1808 dev_dbg(chan->dev, "Inter-packet latency too long\n"); 1809 } 1810 1811 if (status & XILINX_MCDMA_IRQ_IOC_MASK) { 1812 spin_lock(&chan->lock); 1813 xilinx_dma_complete_descriptor(chan); 1814 chan->idle = true; 1815 chan->start_transfer(chan); 1816 spin_unlock(&chan->lock); 1817 } 1818 1819 tasklet_schedule(&chan->tasklet); 1820 return IRQ_HANDLED; 1821 } 1822 1823 /** 1824 * xilinx_dma_irq_handler - DMA Interrupt handler 1825 * @irq: IRQ number 1826 * @data: Pointer to the Xilinx DMA channel structure 1827 * 1828 * Return: IRQ_HANDLED/IRQ_NONE 1829 */ 1830 static irqreturn_t xilinx_dma_irq_handler(int irq, void *data) 1831 { 1832 struct xilinx_dma_chan *chan = data; 1833 u32 status; 1834 1835 /* Read the status and ack the interrupts. */ 1836 status = dma_ctrl_read(chan, XILINX_DMA_REG_DMASR); 1837 if (!(status & XILINX_DMA_DMAXR_ALL_IRQ_MASK)) 1838 return IRQ_NONE; 1839 1840 dma_ctrl_write(chan, XILINX_DMA_REG_DMASR, 1841 status & XILINX_DMA_DMAXR_ALL_IRQ_MASK); 1842 1843 if (status & XILINX_DMA_DMASR_ERR_IRQ) { 1844 /* 1845 * An error occurred. If C_FLUSH_ON_FSYNC is enabled and the 1846 * error is recoverable, ignore it. Otherwise flag the error. 1847 * 1848 * Only recoverable errors can be cleared in the DMASR register, 1849 * make sure not to write to other error bits to 1. 1850 */ 1851 u32 errors = status & XILINX_DMA_DMASR_ALL_ERR_MASK; 1852 1853 dma_ctrl_write(chan, XILINX_DMA_REG_DMASR, 1854 errors & XILINX_DMA_DMASR_ERR_RECOVER_MASK); 1855 1856 if (!chan->flush_on_fsync || 1857 (errors & ~XILINX_DMA_DMASR_ERR_RECOVER_MASK)) { 1858 dev_err(chan->dev, 1859 "Channel %p has errors %x, cdr %x tdr %x\n", 1860 chan, errors, 1861 dma_ctrl_read(chan, XILINX_DMA_REG_CURDESC), 1862 dma_ctrl_read(chan, XILINX_DMA_REG_TAILDESC)); 1863 chan->err = true; 1864 } 1865 } 1866 1867 if (status & XILINX_DMA_DMASR_DLY_CNT_IRQ) { 1868 /* 1869 * Device takes too long to do the transfer when user requires 1870 * responsiveness. 1871 */ 1872 dev_dbg(chan->dev, "Inter-packet latency too long\n"); 1873 } 1874 1875 if (status & XILINX_DMA_DMASR_FRM_CNT_IRQ) { 1876 spin_lock(&chan->lock); 1877 xilinx_dma_complete_descriptor(chan); 1878 chan->idle = true; 1879 chan->start_transfer(chan); 1880 spin_unlock(&chan->lock); 1881 } 1882 1883 tasklet_schedule(&chan->tasklet); 1884 return IRQ_HANDLED; 1885 } 1886 1887 /** 1888 * append_desc_queue - Queuing descriptor 1889 * @chan: Driver specific dma channel 1890 * @desc: dma transaction descriptor 1891 */ 1892 static void append_desc_queue(struct xilinx_dma_chan *chan, 1893 struct xilinx_dma_tx_descriptor *desc) 1894 { 1895 struct xilinx_vdma_tx_segment *tail_segment; 1896 struct xilinx_dma_tx_descriptor *tail_desc; 1897 struct xilinx_axidma_tx_segment *axidma_tail_segment; 1898 struct xilinx_aximcdma_tx_segment *aximcdma_tail_segment; 1899 struct xilinx_cdma_tx_segment *cdma_tail_segment; 1900 1901 if (list_empty(&chan->pending_list)) 1902 goto append; 1903 1904 /* 1905 * Add the hardware descriptor to the chain of hardware descriptors 1906 * that already exists in memory. 1907 */ 1908 tail_desc = list_last_entry(&chan->pending_list, 1909 struct xilinx_dma_tx_descriptor, node); 1910 if (chan->xdev->dma_config->dmatype == XDMA_TYPE_VDMA) { 1911 tail_segment = list_last_entry(&tail_desc->segments, 1912 struct xilinx_vdma_tx_segment, 1913 node); 1914 tail_segment->hw.next_desc = (u32)desc->async_tx.phys; 1915 } else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) { 1916 cdma_tail_segment = list_last_entry(&tail_desc->segments, 1917 struct xilinx_cdma_tx_segment, 1918 node); 1919 cdma_tail_segment->hw.next_desc = (u32)desc->async_tx.phys; 1920 } else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) { 1921 axidma_tail_segment = list_last_entry(&tail_desc->segments, 1922 struct xilinx_axidma_tx_segment, 1923 node); 1924 axidma_tail_segment->hw.next_desc = (u32)desc->async_tx.phys; 1925 } else { 1926 aximcdma_tail_segment = 1927 list_last_entry(&tail_desc->segments, 1928 struct xilinx_aximcdma_tx_segment, 1929 node); 1930 aximcdma_tail_segment->hw.next_desc = (u32)desc->async_tx.phys; 1931 } 1932 1933 /* 1934 * Add the software descriptor and all children to the list 1935 * of pending transactions 1936 */ 1937 append: 1938 list_add_tail(&desc->node, &chan->pending_list); 1939 chan->desc_pendingcount++; 1940 1941 if (chan->has_sg && (chan->xdev->dma_config->dmatype == XDMA_TYPE_VDMA) 1942 && unlikely(chan->desc_pendingcount > chan->num_frms)) { 1943 dev_dbg(chan->dev, "desc pendingcount is too high\n"); 1944 chan->desc_pendingcount = chan->num_frms; 1945 } 1946 } 1947 1948 /** 1949 * xilinx_dma_tx_submit - Submit DMA transaction 1950 * @tx: Async transaction descriptor 1951 * 1952 * Return: cookie value on success and failure value on error 1953 */ 1954 static dma_cookie_t xilinx_dma_tx_submit(struct dma_async_tx_descriptor *tx) 1955 { 1956 struct xilinx_dma_tx_descriptor *desc = to_dma_tx_descriptor(tx); 1957 struct xilinx_dma_chan *chan = to_xilinx_chan(tx->chan); 1958 dma_cookie_t cookie; 1959 unsigned long flags; 1960 int err; 1961 1962 if (chan->cyclic) { 1963 xilinx_dma_free_tx_descriptor(chan, desc); 1964 return -EBUSY; 1965 } 1966 1967 if (chan->err) { 1968 /* 1969 * If reset fails, need to hard reset the system. 1970 * Channel is no longer functional 1971 */ 1972 err = xilinx_dma_chan_reset(chan); 1973 if (err < 0) 1974 return err; 1975 } 1976 1977 spin_lock_irqsave(&chan->lock, flags); 1978 1979 cookie = dma_cookie_assign(tx); 1980 1981 /* Put this transaction onto the tail of the pending queue */ 1982 append_desc_queue(chan, desc); 1983 1984 if (desc->cyclic) 1985 chan->cyclic = true; 1986 1987 chan->terminating = false; 1988 1989 spin_unlock_irqrestore(&chan->lock, flags); 1990 1991 return cookie; 1992 } 1993 1994 /** 1995 * xilinx_vdma_dma_prep_interleaved - prepare a descriptor for a 1996 * DMA_SLAVE transaction 1997 * @dchan: DMA channel 1998 * @xt: Interleaved template pointer 1999 * @flags: transfer ack flags 2000 * 2001 * Return: Async transaction descriptor on success and NULL on failure 2002 */ 2003 static struct dma_async_tx_descriptor * 2004 xilinx_vdma_dma_prep_interleaved(struct dma_chan *dchan, 2005 struct dma_interleaved_template *xt, 2006 unsigned long flags) 2007 { 2008 struct xilinx_dma_chan *chan = to_xilinx_chan(dchan); 2009 struct xilinx_dma_tx_descriptor *desc; 2010 struct xilinx_vdma_tx_segment *segment; 2011 struct xilinx_vdma_desc_hw *hw; 2012 2013 if (!is_slave_direction(xt->dir)) 2014 return NULL; 2015 2016 if (!xt->numf || !xt->sgl[0].size) 2017 return NULL; 2018 2019 if (xt->frame_size != 1) 2020 return NULL; 2021 2022 /* Allocate a transaction descriptor. */ 2023 desc = xilinx_dma_alloc_tx_descriptor(chan); 2024 if (!desc) 2025 return NULL; 2026 2027 dma_async_tx_descriptor_init(&desc->async_tx, &chan->common); 2028 desc->async_tx.tx_submit = xilinx_dma_tx_submit; 2029 async_tx_ack(&desc->async_tx); 2030 2031 /* Allocate the link descriptor from DMA pool */ 2032 segment = xilinx_vdma_alloc_tx_segment(chan); 2033 if (!segment) 2034 goto error; 2035 2036 /* Fill in the hardware descriptor */ 2037 hw = &segment->hw; 2038 hw->vsize = xt->numf; 2039 hw->hsize = xt->sgl[0].size; 2040 hw->stride = (xt->sgl[0].icg + xt->sgl[0].size) << 2041 XILINX_DMA_FRMDLY_STRIDE_STRIDE_SHIFT; 2042 hw->stride |= chan->config.frm_dly << 2043 XILINX_DMA_FRMDLY_STRIDE_FRMDLY_SHIFT; 2044 2045 if (xt->dir != DMA_MEM_TO_DEV) { 2046 if (chan->ext_addr) { 2047 hw->buf_addr = lower_32_bits(xt->dst_start); 2048 hw->buf_addr_msb = upper_32_bits(xt->dst_start); 2049 } else { 2050 hw->buf_addr = xt->dst_start; 2051 } 2052 } else { 2053 if (chan->ext_addr) { 2054 hw->buf_addr = lower_32_bits(xt->src_start); 2055 hw->buf_addr_msb = upper_32_bits(xt->src_start); 2056 } else { 2057 hw->buf_addr = xt->src_start; 2058 } 2059 } 2060 2061 /* Insert the segment into the descriptor segments list. */ 2062 list_add_tail(&segment->node, &desc->segments); 2063 2064 /* Link the last hardware descriptor with the first. */ 2065 segment = list_first_entry(&desc->segments, 2066 struct xilinx_vdma_tx_segment, node); 2067 desc->async_tx.phys = segment->phys; 2068 2069 return &desc->async_tx; 2070 2071 error: 2072 xilinx_dma_free_tx_descriptor(chan, desc); 2073 return NULL; 2074 } 2075 2076 /** 2077 * xilinx_cdma_prep_memcpy - prepare descriptors for a memcpy transaction 2078 * @dchan: DMA channel 2079 * @dma_dst: destination address 2080 * @dma_src: source address 2081 * @len: transfer length 2082 * @flags: transfer ack flags 2083 * 2084 * Return: Async transaction descriptor on success and NULL on failure 2085 */ 2086 static struct dma_async_tx_descriptor * 2087 xilinx_cdma_prep_memcpy(struct dma_chan *dchan, dma_addr_t dma_dst, 2088 dma_addr_t dma_src, size_t len, unsigned long flags) 2089 { 2090 struct xilinx_dma_chan *chan = to_xilinx_chan(dchan); 2091 struct xilinx_dma_tx_descriptor *desc; 2092 struct xilinx_cdma_tx_segment *segment; 2093 struct xilinx_cdma_desc_hw *hw; 2094 2095 if (!len || len > chan->xdev->max_buffer_len) 2096 return NULL; 2097 2098 desc = xilinx_dma_alloc_tx_descriptor(chan); 2099 if (!desc) 2100 return NULL; 2101 2102 dma_async_tx_descriptor_init(&desc->async_tx, &chan->common); 2103 desc->async_tx.tx_submit = xilinx_dma_tx_submit; 2104 2105 /* Allocate the link descriptor from DMA pool */ 2106 segment = xilinx_cdma_alloc_tx_segment(chan); 2107 if (!segment) 2108 goto error; 2109 2110 hw = &segment->hw; 2111 hw->control = len; 2112 hw->src_addr = dma_src; 2113 hw->dest_addr = dma_dst; 2114 if (chan->ext_addr) { 2115 hw->src_addr_msb = upper_32_bits(dma_src); 2116 hw->dest_addr_msb = upper_32_bits(dma_dst); 2117 } 2118 2119 /* Insert the segment into the descriptor segments list. */ 2120 list_add_tail(&segment->node, &desc->segments); 2121 2122 desc->async_tx.phys = segment->phys; 2123 hw->next_desc = segment->phys; 2124 2125 return &desc->async_tx; 2126 2127 error: 2128 xilinx_dma_free_tx_descriptor(chan, desc); 2129 return NULL; 2130 } 2131 2132 /** 2133 * xilinx_dma_prep_slave_sg - prepare descriptors for a DMA_SLAVE transaction 2134 * @dchan: DMA channel 2135 * @sgl: scatterlist to transfer to/from 2136 * @sg_len: number of entries in @scatterlist 2137 * @direction: DMA direction 2138 * @flags: transfer ack flags 2139 * @context: APP words of the descriptor 2140 * 2141 * Return: Async transaction descriptor on success and NULL on failure 2142 */ 2143 static struct dma_async_tx_descriptor *xilinx_dma_prep_slave_sg( 2144 struct dma_chan *dchan, struct scatterlist *sgl, unsigned int sg_len, 2145 enum dma_transfer_direction direction, unsigned long flags, 2146 void *context) 2147 { 2148 struct xilinx_dma_chan *chan = to_xilinx_chan(dchan); 2149 struct xilinx_dma_tx_descriptor *desc; 2150 struct xilinx_axidma_tx_segment *segment = NULL; 2151 u32 *app_w = (u32 *)context; 2152 struct scatterlist *sg; 2153 size_t copy; 2154 size_t sg_used; 2155 unsigned int i; 2156 2157 if (!is_slave_direction(direction)) 2158 return NULL; 2159 2160 /* Allocate a transaction descriptor. */ 2161 desc = xilinx_dma_alloc_tx_descriptor(chan); 2162 if (!desc) 2163 return NULL; 2164 2165 dma_async_tx_descriptor_init(&desc->async_tx, &chan->common); 2166 desc->async_tx.tx_submit = xilinx_dma_tx_submit; 2167 2168 /* Build transactions using information in the scatter gather list */ 2169 for_each_sg(sgl, sg, sg_len, i) { 2170 sg_used = 0; 2171 2172 /* Loop until the entire scatterlist entry is used */ 2173 while (sg_used < sg_dma_len(sg)) { 2174 struct xilinx_axidma_desc_hw *hw; 2175 2176 /* Get a free segment */ 2177 segment = xilinx_axidma_alloc_tx_segment(chan); 2178 if (!segment) 2179 goto error; 2180 2181 /* 2182 * Calculate the maximum number of bytes to transfer, 2183 * making sure it is less than the hw limit 2184 */ 2185 copy = xilinx_dma_calc_copysize(chan, sg_dma_len(sg), 2186 sg_used); 2187 hw = &segment->hw; 2188 2189 /* Fill in the descriptor */ 2190 xilinx_axidma_buf(chan, hw, sg_dma_address(sg), 2191 sg_used, 0); 2192 2193 hw->control = copy; 2194 2195 if (chan->direction == DMA_MEM_TO_DEV) { 2196 if (app_w) 2197 memcpy(hw->app, app_w, sizeof(u32) * 2198 XILINX_DMA_NUM_APP_WORDS); 2199 } 2200 2201 sg_used += copy; 2202 2203 /* 2204 * Insert the segment into the descriptor segments 2205 * list. 2206 */ 2207 list_add_tail(&segment->node, &desc->segments); 2208 } 2209 } 2210 2211 segment = list_first_entry(&desc->segments, 2212 struct xilinx_axidma_tx_segment, node); 2213 desc->async_tx.phys = segment->phys; 2214 2215 /* For the last DMA_MEM_TO_DEV transfer, set EOP */ 2216 if (chan->direction == DMA_MEM_TO_DEV) { 2217 segment->hw.control |= XILINX_DMA_BD_SOP; 2218 segment = list_last_entry(&desc->segments, 2219 struct xilinx_axidma_tx_segment, 2220 node); 2221 segment->hw.control |= XILINX_DMA_BD_EOP; 2222 } 2223 2224 return &desc->async_tx; 2225 2226 error: 2227 xilinx_dma_free_tx_descriptor(chan, desc); 2228 return NULL; 2229 } 2230 2231 /** 2232 * xilinx_dma_prep_dma_cyclic - prepare descriptors for a DMA_SLAVE transaction 2233 * @dchan: DMA channel 2234 * @buf_addr: Physical address of the buffer 2235 * @buf_len: Total length of the cyclic buffers 2236 * @period_len: length of individual cyclic buffer 2237 * @direction: DMA direction 2238 * @flags: transfer ack flags 2239 * 2240 * Return: Async transaction descriptor on success and NULL on failure 2241 */ 2242 static struct dma_async_tx_descriptor *xilinx_dma_prep_dma_cyclic( 2243 struct dma_chan *dchan, dma_addr_t buf_addr, size_t buf_len, 2244 size_t period_len, enum dma_transfer_direction direction, 2245 unsigned long flags) 2246 { 2247 struct xilinx_dma_chan *chan = to_xilinx_chan(dchan); 2248 struct xilinx_dma_tx_descriptor *desc; 2249 struct xilinx_axidma_tx_segment *segment, *head_segment, *prev = NULL; 2250 size_t copy, sg_used; 2251 unsigned int num_periods; 2252 int i; 2253 u32 reg; 2254 2255 if (!period_len) 2256 return NULL; 2257 2258 num_periods = buf_len / period_len; 2259 2260 if (!num_periods) 2261 return NULL; 2262 2263 if (!is_slave_direction(direction)) 2264 return NULL; 2265 2266 /* Allocate a transaction descriptor. */ 2267 desc = xilinx_dma_alloc_tx_descriptor(chan); 2268 if (!desc) 2269 return NULL; 2270 2271 chan->direction = direction; 2272 dma_async_tx_descriptor_init(&desc->async_tx, &chan->common); 2273 desc->async_tx.tx_submit = xilinx_dma_tx_submit; 2274 2275 for (i = 0; i < num_periods; ++i) { 2276 sg_used = 0; 2277 2278 while (sg_used < period_len) { 2279 struct xilinx_axidma_desc_hw *hw; 2280 2281 /* Get a free segment */ 2282 segment = xilinx_axidma_alloc_tx_segment(chan); 2283 if (!segment) 2284 goto error; 2285 2286 /* 2287 * Calculate the maximum number of bytes to transfer, 2288 * making sure it is less than the hw limit 2289 */ 2290 copy = xilinx_dma_calc_copysize(chan, period_len, 2291 sg_used); 2292 hw = &segment->hw; 2293 xilinx_axidma_buf(chan, hw, buf_addr, sg_used, 2294 period_len * i); 2295 hw->control = copy; 2296 2297 if (prev) 2298 prev->hw.next_desc = segment->phys; 2299 2300 prev = segment; 2301 sg_used += copy; 2302 2303 /* 2304 * Insert the segment into the descriptor segments 2305 * list. 2306 */ 2307 list_add_tail(&segment->node, &desc->segments); 2308 } 2309 } 2310 2311 head_segment = list_first_entry(&desc->segments, 2312 struct xilinx_axidma_tx_segment, node); 2313 desc->async_tx.phys = head_segment->phys; 2314 2315 desc->cyclic = true; 2316 reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR); 2317 reg |= XILINX_DMA_CR_CYCLIC_BD_EN_MASK; 2318 dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg); 2319 2320 segment = list_last_entry(&desc->segments, 2321 struct xilinx_axidma_tx_segment, 2322 node); 2323 segment->hw.next_desc = (u32) head_segment->phys; 2324 2325 /* For the last DMA_MEM_TO_DEV transfer, set EOP */ 2326 if (direction == DMA_MEM_TO_DEV) { 2327 head_segment->hw.control |= XILINX_DMA_BD_SOP; 2328 segment->hw.control |= XILINX_DMA_BD_EOP; 2329 } 2330 2331 return &desc->async_tx; 2332 2333 error: 2334 xilinx_dma_free_tx_descriptor(chan, desc); 2335 return NULL; 2336 } 2337 2338 /** 2339 * xilinx_mcdma_prep_slave_sg - prepare descriptors for a DMA_SLAVE transaction 2340 * @dchan: DMA channel 2341 * @sgl: scatterlist to transfer to/from 2342 * @sg_len: number of entries in @scatterlist 2343 * @direction: DMA direction 2344 * @flags: transfer ack flags 2345 * @context: APP words of the descriptor 2346 * 2347 * Return: Async transaction descriptor on success and NULL on failure 2348 */ 2349 static struct dma_async_tx_descriptor * 2350 xilinx_mcdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl, 2351 unsigned int sg_len, 2352 enum dma_transfer_direction direction, 2353 unsigned long flags, void *context) 2354 { 2355 struct xilinx_dma_chan *chan = to_xilinx_chan(dchan); 2356 struct xilinx_dma_tx_descriptor *desc; 2357 struct xilinx_aximcdma_tx_segment *segment = NULL; 2358 u32 *app_w = (u32 *)context; 2359 struct scatterlist *sg; 2360 size_t copy; 2361 size_t sg_used; 2362 unsigned int i; 2363 2364 if (!is_slave_direction(direction)) 2365 return NULL; 2366 2367 /* Allocate a transaction descriptor. */ 2368 desc = xilinx_dma_alloc_tx_descriptor(chan); 2369 if (!desc) 2370 return NULL; 2371 2372 dma_async_tx_descriptor_init(&desc->async_tx, &chan->common); 2373 desc->async_tx.tx_submit = xilinx_dma_tx_submit; 2374 2375 /* Build transactions using information in the scatter gather list */ 2376 for_each_sg(sgl, sg, sg_len, i) { 2377 sg_used = 0; 2378 2379 /* Loop until the entire scatterlist entry is used */ 2380 while (sg_used < sg_dma_len(sg)) { 2381 struct xilinx_aximcdma_desc_hw *hw; 2382 2383 /* Get a free segment */ 2384 segment = xilinx_aximcdma_alloc_tx_segment(chan); 2385 if (!segment) 2386 goto error; 2387 2388 /* 2389 * Calculate the maximum number of bytes to transfer, 2390 * making sure it is less than the hw limit 2391 */ 2392 copy = min_t(size_t, sg_dma_len(sg) - sg_used, 2393 chan->xdev->max_buffer_len); 2394 hw = &segment->hw; 2395 2396 /* Fill in the descriptor */ 2397 xilinx_aximcdma_buf(chan, hw, sg_dma_address(sg), 2398 sg_used); 2399 hw->control = copy; 2400 2401 if (chan->direction == DMA_MEM_TO_DEV && app_w) { 2402 memcpy(hw->app, app_w, sizeof(u32) * 2403 XILINX_DMA_NUM_APP_WORDS); 2404 } 2405 2406 sg_used += copy; 2407 /* 2408 * Insert the segment into the descriptor segments 2409 * list. 2410 */ 2411 list_add_tail(&segment->node, &desc->segments); 2412 } 2413 } 2414 2415 segment = list_first_entry(&desc->segments, 2416 struct xilinx_aximcdma_tx_segment, node); 2417 desc->async_tx.phys = segment->phys; 2418 2419 /* For the last DMA_MEM_TO_DEV transfer, set EOP */ 2420 if (chan->direction == DMA_MEM_TO_DEV) { 2421 segment->hw.control |= XILINX_MCDMA_BD_SOP; 2422 segment = list_last_entry(&desc->segments, 2423 struct xilinx_aximcdma_tx_segment, 2424 node); 2425 segment->hw.control |= XILINX_MCDMA_BD_EOP; 2426 } 2427 2428 return &desc->async_tx; 2429 2430 error: 2431 xilinx_dma_free_tx_descriptor(chan, desc); 2432 2433 return NULL; 2434 } 2435 2436 /** 2437 * xilinx_dma_terminate_all - Halt the channel and free descriptors 2438 * @dchan: Driver specific DMA Channel pointer 2439 * 2440 * Return: '0' always. 2441 */ 2442 static int xilinx_dma_terminate_all(struct dma_chan *dchan) 2443 { 2444 struct xilinx_dma_chan *chan = to_xilinx_chan(dchan); 2445 u32 reg; 2446 int err; 2447 2448 if (!chan->cyclic) { 2449 err = chan->stop_transfer(chan); 2450 if (err) { 2451 dev_err(chan->dev, "Cannot stop channel %p: %x\n", 2452 chan, dma_ctrl_read(chan, 2453 XILINX_DMA_REG_DMASR)); 2454 chan->err = true; 2455 } 2456 } 2457 2458 xilinx_dma_chan_reset(chan); 2459 /* Remove and free all of the descriptors in the lists */ 2460 chan->terminating = true; 2461 xilinx_dma_free_descriptors(chan); 2462 chan->idle = true; 2463 2464 if (chan->cyclic) { 2465 reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR); 2466 reg &= ~XILINX_DMA_CR_CYCLIC_BD_EN_MASK; 2467 dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg); 2468 chan->cyclic = false; 2469 } 2470 2471 if ((chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) && chan->has_sg) 2472 dma_ctrl_clr(chan, XILINX_DMA_REG_DMACR, 2473 XILINX_CDMA_CR_SGMODE); 2474 2475 return 0; 2476 } 2477 2478 static void xilinx_dma_synchronize(struct dma_chan *dchan) 2479 { 2480 struct xilinx_dma_chan *chan = to_xilinx_chan(dchan); 2481 2482 tasklet_kill(&chan->tasklet); 2483 } 2484 2485 /** 2486 * xilinx_vdma_channel_set_config - Configure VDMA channel 2487 * Run-time configuration for Axi VDMA, supports: 2488 * . halt the channel 2489 * . configure interrupt coalescing and inter-packet delay threshold 2490 * . start/stop parking 2491 * . enable genlock 2492 * 2493 * @dchan: DMA channel 2494 * @cfg: VDMA device configuration pointer 2495 * 2496 * Return: '0' on success and failure value on error 2497 */ 2498 int xilinx_vdma_channel_set_config(struct dma_chan *dchan, 2499 struct xilinx_vdma_config *cfg) 2500 { 2501 struct xilinx_dma_chan *chan = to_xilinx_chan(dchan); 2502 u32 dmacr; 2503 2504 if (cfg->reset) 2505 return xilinx_dma_chan_reset(chan); 2506 2507 dmacr = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR); 2508 2509 chan->config.frm_dly = cfg->frm_dly; 2510 chan->config.park = cfg->park; 2511 2512 /* genlock settings */ 2513 chan->config.gen_lock = cfg->gen_lock; 2514 chan->config.master = cfg->master; 2515 2516 dmacr &= ~XILINX_DMA_DMACR_GENLOCK_EN; 2517 if (cfg->gen_lock && chan->genlock) { 2518 dmacr |= XILINX_DMA_DMACR_GENLOCK_EN; 2519 dmacr &= ~XILINX_DMA_DMACR_MASTER_MASK; 2520 dmacr |= cfg->master << XILINX_DMA_DMACR_MASTER_SHIFT; 2521 } 2522 2523 chan->config.frm_cnt_en = cfg->frm_cnt_en; 2524 chan->config.vflip_en = cfg->vflip_en; 2525 2526 if (cfg->park) 2527 chan->config.park_frm = cfg->park_frm; 2528 else 2529 chan->config.park_frm = -1; 2530 2531 chan->config.coalesc = cfg->coalesc; 2532 chan->config.delay = cfg->delay; 2533 2534 if (cfg->coalesc <= XILINX_DMA_DMACR_FRAME_COUNT_MAX) { 2535 dmacr &= ~XILINX_DMA_DMACR_FRAME_COUNT_MASK; 2536 dmacr |= cfg->coalesc << XILINX_DMA_DMACR_FRAME_COUNT_SHIFT; 2537 chan->config.coalesc = cfg->coalesc; 2538 } 2539 2540 if (cfg->delay <= XILINX_DMA_DMACR_DELAY_MAX) { 2541 dmacr &= ~XILINX_DMA_DMACR_DELAY_MASK; 2542 dmacr |= cfg->delay << XILINX_DMA_DMACR_DELAY_SHIFT; 2543 chan->config.delay = cfg->delay; 2544 } 2545 2546 /* FSync Source selection */ 2547 dmacr &= ~XILINX_DMA_DMACR_FSYNCSRC_MASK; 2548 dmacr |= cfg->ext_fsync << XILINX_DMA_DMACR_FSYNCSRC_SHIFT; 2549 2550 dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, dmacr); 2551 2552 return 0; 2553 } 2554 EXPORT_SYMBOL(xilinx_vdma_channel_set_config); 2555 2556 /* ----------------------------------------------------------------------------- 2557 * Probe and remove 2558 */ 2559 2560 /** 2561 * xilinx_dma_chan_remove - Per Channel remove function 2562 * @chan: Driver specific DMA channel 2563 */ 2564 static void xilinx_dma_chan_remove(struct xilinx_dma_chan *chan) 2565 { 2566 /* Disable all interrupts */ 2567 dma_ctrl_clr(chan, XILINX_DMA_REG_DMACR, 2568 XILINX_DMA_DMAXR_ALL_IRQ_MASK); 2569 2570 if (chan->irq > 0) 2571 free_irq(chan->irq, chan); 2572 2573 tasklet_kill(&chan->tasklet); 2574 2575 list_del(&chan->common.device_node); 2576 } 2577 2578 static int axidma_clk_init(struct platform_device *pdev, struct clk **axi_clk, 2579 struct clk **tx_clk, struct clk **rx_clk, 2580 struct clk **sg_clk, struct clk **tmp_clk) 2581 { 2582 int err; 2583 2584 *tmp_clk = NULL; 2585 2586 *axi_clk = devm_clk_get(&pdev->dev, "s_axi_lite_aclk"); 2587 if (IS_ERR(*axi_clk)) 2588 return dev_err_probe(&pdev->dev, PTR_ERR(*axi_clk), "failed to get axi_aclk\n"); 2589 2590 *tx_clk = devm_clk_get(&pdev->dev, "m_axi_mm2s_aclk"); 2591 if (IS_ERR(*tx_clk)) 2592 *tx_clk = NULL; 2593 2594 *rx_clk = devm_clk_get(&pdev->dev, "m_axi_s2mm_aclk"); 2595 if (IS_ERR(*rx_clk)) 2596 *rx_clk = NULL; 2597 2598 *sg_clk = devm_clk_get(&pdev->dev, "m_axi_sg_aclk"); 2599 if (IS_ERR(*sg_clk)) 2600 *sg_clk = NULL; 2601 2602 err = clk_prepare_enable(*axi_clk); 2603 if (err) { 2604 dev_err(&pdev->dev, "failed to enable axi_clk (%d)\n", err); 2605 return err; 2606 } 2607 2608 err = clk_prepare_enable(*tx_clk); 2609 if (err) { 2610 dev_err(&pdev->dev, "failed to enable tx_clk (%d)\n", err); 2611 goto err_disable_axiclk; 2612 } 2613 2614 err = clk_prepare_enable(*rx_clk); 2615 if (err) { 2616 dev_err(&pdev->dev, "failed to enable rx_clk (%d)\n", err); 2617 goto err_disable_txclk; 2618 } 2619 2620 err = clk_prepare_enable(*sg_clk); 2621 if (err) { 2622 dev_err(&pdev->dev, "failed to enable sg_clk (%d)\n", err); 2623 goto err_disable_rxclk; 2624 } 2625 2626 return 0; 2627 2628 err_disable_rxclk: 2629 clk_disable_unprepare(*rx_clk); 2630 err_disable_txclk: 2631 clk_disable_unprepare(*tx_clk); 2632 err_disable_axiclk: 2633 clk_disable_unprepare(*axi_clk); 2634 2635 return err; 2636 } 2637 2638 static int axicdma_clk_init(struct platform_device *pdev, struct clk **axi_clk, 2639 struct clk **dev_clk, struct clk **tmp_clk, 2640 struct clk **tmp1_clk, struct clk **tmp2_clk) 2641 { 2642 int err; 2643 2644 *tmp_clk = NULL; 2645 *tmp1_clk = NULL; 2646 *tmp2_clk = NULL; 2647 2648 *axi_clk = devm_clk_get(&pdev->dev, "s_axi_lite_aclk"); 2649 if (IS_ERR(*axi_clk)) 2650 return dev_err_probe(&pdev->dev, PTR_ERR(*axi_clk), "failed to get axi_aclk\n"); 2651 2652 *dev_clk = devm_clk_get(&pdev->dev, "m_axi_aclk"); 2653 if (IS_ERR(*dev_clk)) 2654 return dev_err_probe(&pdev->dev, PTR_ERR(*dev_clk), "failed to get dev_clk\n"); 2655 2656 err = clk_prepare_enable(*axi_clk); 2657 if (err) { 2658 dev_err(&pdev->dev, "failed to enable axi_clk (%d)\n", err); 2659 return err; 2660 } 2661 2662 err = clk_prepare_enable(*dev_clk); 2663 if (err) { 2664 dev_err(&pdev->dev, "failed to enable dev_clk (%d)\n", err); 2665 goto err_disable_axiclk; 2666 } 2667 2668 return 0; 2669 2670 err_disable_axiclk: 2671 clk_disable_unprepare(*axi_clk); 2672 2673 return err; 2674 } 2675 2676 static int axivdma_clk_init(struct platform_device *pdev, struct clk **axi_clk, 2677 struct clk **tx_clk, struct clk **txs_clk, 2678 struct clk **rx_clk, struct clk **rxs_clk) 2679 { 2680 int err; 2681 2682 *axi_clk = devm_clk_get(&pdev->dev, "s_axi_lite_aclk"); 2683 if (IS_ERR(*axi_clk)) 2684 return dev_err_probe(&pdev->dev, PTR_ERR(*axi_clk), "failed to get axi_aclk\n"); 2685 2686 *tx_clk = devm_clk_get(&pdev->dev, "m_axi_mm2s_aclk"); 2687 if (IS_ERR(*tx_clk)) 2688 *tx_clk = NULL; 2689 2690 *txs_clk = devm_clk_get(&pdev->dev, "m_axis_mm2s_aclk"); 2691 if (IS_ERR(*txs_clk)) 2692 *txs_clk = NULL; 2693 2694 *rx_clk = devm_clk_get(&pdev->dev, "m_axi_s2mm_aclk"); 2695 if (IS_ERR(*rx_clk)) 2696 *rx_clk = NULL; 2697 2698 *rxs_clk = devm_clk_get(&pdev->dev, "s_axis_s2mm_aclk"); 2699 if (IS_ERR(*rxs_clk)) 2700 *rxs_clk = NULL; 2701 2702 err = clk_prepare_enable(*axi_clk); 2703 if (err) { 2704 dev_err(&pdev->dev, "failed to enable axi_clk (%d)\n", 2705 err); 2706 return err; 2707 } 2708 2709 err = clk_prepare_enable(*tx_clk); 2710 if (err) { 2711 dev_err(&pdev->dev, "failed to enable tx_clk (%d)\n", err); 2712 goto err_disable_axiclk; 2713 } 2714 2715 err = clk_prepare_enable(*txs_clk); 2716 if (err) { 2717 dev_err(&pdev->dev, "failed to enable txs_clk (%d)\n", err); 2718 goto err_disable_txclk; 2719 } 2720 2721 err = clk_prepare_enable(*rx_clk); 2722 if (err) { 2723 dev_err(&pdev->dev, "failed to enable rx_clk (%d)\n", err); 2724 goto err_disable_txsclk; 2725 } 2726 2727 err = clk_prepare_enable(*rxs_clk); 2728 if (err) { 2729 dev_err(&pdev->dev, "failed to enable rxs_clk (%d)\n", err); 2730 goto err_disable_rxclk; 2731 } 2732 2733 return 0; 2734 2735 err_disable_rxclk: 2736 clk_disable_unprepare(*rx_clk); 2737 err_disable_txsclk: 2738 clk_disable_unprepare(*txs_clk); 2739 err_disable_txclk: 2740 clk_disable_unprepare(*tx_clk); 2741 err_disable_axiclk: 2742 clk_disable_unprepare(*axi_clk); 2743 2744 return err; 2745 } 2746 2747 static void xdma_disable_allclks(struct xilinx_dma_device *xdev) 2748 { 2749 clk_disable_unprepare(xdev->rxs_clk); 2750 clk_disable_unprepare(xdev->rx_clk); 2751 clk_disable_unprepare(xdev->txs_clk); 2752 clk_disable_unprepare(xdev->tx_clk); 2753 clk_disable_unprepare(xdev->axi_clk); 2754 } 2755 2756 /** 2757 * xilinx_dma_chan_probe - Per Channel Probing 2758 * It get channel features from the device tree entry and 2759 * initialize special channel handling routines 2760 * 2761 * @xdev: Driver specific device structure 2762 * @node: Device node 2763 * 2764 * Return: '0' on success and failure value on error 2765 */ 2766 static int xilinx_dma_chan_probe(struct xilinx_dma_device *xdev, 2767 struct device_node *node) 2768 { 2769 struct xilinx_dma_chan *chan; 2770 bool has_dre = false; 2771 u32 value, width; 2772 int err; 2773 2774 /* Allocate and initialize the channel structure */ 2775 chan = devm_kzalloc(xdev->dev, sizeof(*chan), GFP_KERNEL); 2776 if (!chan) 2777 return -ENOMEM; 2778 2779 chan->dev = xdev->dev; 2780 chan->xdev = xdev; 2781 chan->desc_pendingcount = 0x0; 2782 chan->ext_addr = xdev->ext_addr; 2783 /* This variable ensures that descriptors are not 2784 * Submitted when dma engine is in progress. This variable is 2785 * Added to avoid polling for a bit in the status register to 2786 * Know dma state in the driver hot path. 2787 */ 2788 chan->idle = true; 2789 2790 spin_lock_init(&chan->lock); 2791 INIT_LIST_HEAD(&chan->pending_list); 2792 INIT_LIST_HEAD(&chan->done_list); 2793 INIT_LIST_HEAD(&chan->active_list); 2794 INIT_LIST_HEAD(&chan->free_seg_list); 2795 2796 /* Retrieve the channel properties from the device tree */ 2797 has_dre = of_property_read_bool(node, "xlnx,include-dre"); 2798 2799 chan->genlock = of_property_read_bool(node, "xlnx,genlock-mode"); 2800 2801 err = of_property_read_u32(node, "xlnx,datawidth", &value); 2802 if (err) { 2803 dev_err(xdev->dev, "missing xlnx,datawidth property\n"); 2804 return err; 2805 } 2806 width = value >> 3; /* Convert bits to bytes */ 2807 2808 /* If data width is greater than 8 bytes, DRE is not in hw */ 2809 if (width > 8) 2810 has_dre = false; 2811 2812 if (!has_dre) 2813 xdev->common.copy_align = (enum dmaengine_alignment)fls(width - 1); 2814 2815 if (of_device_is_compatible(node, "xlnx,axi-vdma-mm2s-channel") || 2816 of_device_is_compatible(node, "xlnx,axi-dma-mm2s-channel") || 2817 of_device_is_compatible(node, "xlnx,axi-cdma-channel")) { 2818 chan->direction = DMA_MEM_TO_DEV; 2819 chan->id = xdev->mm2s_chan_id++; 2820 chan->tdest = chan->id; 2821 2822 chan->ctrl_offset = XILINX_DMA_MM2S_CTRL_OFFSET; 2823 if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) { 2824 chan->desc_offset = XILINX_VDMA_MM2S_DESC_OFFSET; 2825 chan->config.park = 1; 2826 2827 if (xdev->flush_on_fsync == XILINX_DMA_FLUSH_BOTH || 2828 xdev->flush_on_fsync == XILINX_DMA_FLUSH_MM2S) 2829 chan->flush_on_fsync = true; 2830 } 2831 } else if (of_device_is_compatible(node, 2832 "xlnx,axi-vdma-s2mm-channel") || 2833 of_device_is_compatible(node, 2834 "xlnx,axi-dma-s2mm-channel")) { 2835 chan->direction = DMA_DEV_TO_MEM; 2836 chan->id = xdev->s2mm_chan_id++; 2837 chan->tdest = chan->id - xdev->dma_config->max_channels / 2; 2838 chan->has_vflip = of_property_read_bool(node, 2839 "xlnx,enable-vert-flip"); 2840 if (chan->has_vflip) { 2841 chan->config.vflip_en = dma_read(chan, 2842 XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP) & 2843 XILINX_VDMA_ENABLE_VERTICAL_FLIP; 2844 } 2845 2846 if (xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA) 2847 chan->ctrl_offset = XILINX_MCDMA_S2MM_CTRL_OFFSET; 2848 else 2849 chan->ctrl_offset = XILINX_DMA_S2MM_CTRL_OFFSET; 2850 2851 if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) { 2852 chan->desc_offset = XILINX_VDMA_S2MM_DESC_OFFSET; 2853 chan->config.park = 1; 2854 2855 if (xdev->flush_on_fsync == XILINX_DMA_FLUSH_BOTH || 2856 xdev->flush_on_fsync == XILINX_DMA_FLUSH_S2MM) 2857 chan->flush_on_fsync = true; 2858 } 2859 } else { 2860 dev_err(xdev->dev, "Invalid channel compatible node\n"); 2861 return -EINVAL; 2862 } 2863 2864 /* Request the interrupt */ 2865 chan->irq = of_irq_get(node, chan->tdest); 2866 if (chan->irq < 0) 2867 return dev_err_probe(xdev->dev, chan->irq, "failed to get irq\n"); 2868 err = request_irq(chan->irq, xdev->dma_config->irq_handler, 2869 IRQF_SHARED, "xilinx-dma-controller", chan); 2870 if (err) { 2871 dev_err(xdev->dev, "unable to request IRQ %d\n", chan->irq); 2872 return err; 2873 } 2874 2875 if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) { 2876 chan->start_transfer = xilinx_dma_start_transfer; 2877 chan->stop_transfer = xilinx_dma_stop_transfer; 2878 } else if (xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA) { 2879 chan->start_transfer = xilinx_mcdma_start_transfer; 2880 chan->stop_transfer = xilinx_dma_stop_transfer; 2881 } else if (xdev->dma_config->dmatype == XDMA_TYPE_CDMA) { 2882 chan->start_transfer = xilinx_cdma_start_transfer; 2883 chan->stop_transfer = xilinx_cdma_stop_transfer; 2884 } else { 2885 chan->start_transfer = xilinx_vdma_start_transfer; 2886 chan->stop_transfer = xilinx_dma_stop_transfer; 2887 } 2888 2889 /* check if SG is enabled (only for AXIDMA, AXIMCDMA, and CDMA) */ 2890 if (xdev->dma_config->dmatype != XDMA_TYPE_VDMA) { 2891 if (xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA || 2892 dma_ctrl_read(chan, XILINX_DMA_REG_DMASR) & 2893 XILINX_DMA_DMASR_SG_MASK) 2894 chan->has_sg = true; 2895 dev_dbg(chan->dev, "ch %d: SG %s\n", chan->id, 2896 chan->has_sg ? "enabled" : "disabled"); 2897 } 2898 2899 /* Initialize the tasklet */ 2900 tasklet_setup(&chan->tasklet, xilinx_dma_do_tasklet); 2901 2902 /* 2903 * Initialize the DMA channel and add it to the DMA engine channels 2904 * list. 2905 */ 2906 chan->common.device = &xdev->common; 2907 2908 list_add_tail(&chan->common.device_node, &xdev->common.channels); 2909 xdev->chan[chan->id] = chan; 2910 2911 /* Reset the channel */ 2912 err = xilinx_dma_chan_reset(chan); 2913 if (err < 0) { 2914 dev_err(xdev->dev, "Reset channel failed\n"); 2915 return err; 2916 } 2917 2918 return 0; 2919 } 2920 2921 /** 2922 * xilinx_dma_child_probe - Per child node probe 2923 * It get number of dma-channels per child node from 2924 * device-tree and initializes all the channels. 2925 * 2926 * @xdev: Driver specific device structure 2927 * @node: Device node 2928 * 2929 * Return: '0' on success and failure value on error. 2930 */ 2931 static int xilinx_dma_child_probe(struct xilinx_dma_device *xdev, 2932 struct device_node *node) 2933 { 2934 int ret, i; 2935 u32 nr_channels = 1; 2936 2937 ret = of_property_read_u32(node, "dma-channels", &nr_channels); 2938 if (xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA && ret < 0) 2939 dev_warn(xdev->dev, "missing dma-channels property\n"); 2940 2941 for (i = 0; i < nr_channels; i++) { 2942 ret = xilinx_dma_chan_probe(xdev, node); 2943 if (ret) 2944 return ret; 2945 } 2946 2947 return 0; 2948 } 2949 2950 /** 2951 * of_dma_xilinx_xlate - Translation function 2952 * @dma_spec: Pointer to DMA specifier as found in the device tree 2953 * @ofdma: Pointer to DMA controller data 2954 * 2955 * Return: DMA channel pointer on success and NULL on error 2956 */ 2957 static struct dma_chan *of_dma_xilinx_xlate(struct of_phandle_args *dma_spec, 2958 struct of_dma *ofdma) 2959 { 2960 struct xilinx_dma_device *xdev = ofdma->of_dma_data; 2961 int chan_id = dma_spec->args[0]; 2962 2963 if (chan_id >= xdev->dma_config->max_channels || !xdev->chan[chan_id]) 2964 return NULL; 2965 2966 return dma_get_slave_channel(&xdev->chan[chan_id]->common); 2967 } 2968 2969 static const struct xilinx_dma_config axidma_config = { 2970 .dmatype = XDMA_TYPE_AXIDMA, 2971 .clk_init = axidma_clk_init, 2972 .irq_handler = xilinx_dma_irq_handler, 2973 .max_channels = XILINX_DMA_MAX_CHANS_PER_DEVICE, 2974 }; 2975 2976 static const struct xilinx_dma_config aximcdma_config = { 2977 .dmatype = XDMA_TYPE_AXIMCDMA, 2978 .clk_init = axidma_clk_init, 2979 .irq_handler = xilinx_mcdma_irq_handler, 2980 .max_channels = XILINX_MCDMA_MAX_CHANS_PER_DEVICE, 2981 }; 2982 static const struct xilinx_dma_config axicdma_config = { 2983 .dmatype = XDMA_TYPE_CDMA, 2984 .clk_init = axicdma_clk_init, 2985 .irq_handler = xilinx_dma_irq_handler, 2986 .max_channels = XILINX_CDMA_MAX_CHANS_PER_DEVICE, 2987 }; 2988 2989 static const struct xilinx_dma_config axivdma_config = { 2990 .dmatype = XDMA_TYPE_VDMA, 2991 .clk_init = axivdma_clk_init, 2992 .irq_handler = xilinx_dma_irq_handler, 2993 .max_channels = XILINX_DMA_MAX_CHANS_PER_DEVICE, 2994 }; 2995 2996 static const struct of_device_id xilinx_dma_of_ids[] = { 2997 { .compatible = "xlnx,axi-dma-1.00.a", .data = &axidma_config }, 2998 { .compatible = "xlnx,axi-cdma-1.00.a", .data = &axicdma_config }, 2999 { .compatible = "xlnx,axi-vdma-1.00.a", .data = &axivdma_config }, 3000 { .compatible = "xlnx,axi-mcdma-1.00.a", .data = &aximcdma_config }, 3001 {} 3002 }; 3003 MODULE_DEVICE_TABLE(of, xilinx_dma_of_ids); 3004 3005 /** 3006 * xilinx_dma_probe - Driver probe function 3007 * @pdev: Pointer to the platform_device structure 3008 * 3009 * Return: '0' on success and failure value on error 3010 */ 3011 static int xilinx_dma_probe(struct platform_device *pdev) 3012 { 3013 int (*clk_init)(struct platform_device *, struct clk **, struct clk **, 3014 struct clk **, struct clk **, struct clk **) 3015 = axivdma_clk_init; 3016 struct device_node *node = pdev->dev.of_node; 3017 struct xilinx_dma_device *xdev; 3018 struct device_node *child, *np = pdev->dev.of_node; 3019 u32 num_frames, addr_width, len_width; 3020 int i, err; 3021 3022 /* Allocate and initialize the DMA engine structure */ 3023 xdev = devm_kzalloc(&pdev->dev, sizeof(*xdev), GFP_KERNEL); 3024 if (!xdev) 3025 return -ENOMEM; 3026 3027 xdev->dev = &pdev->dev; 3028 if (np) { 3029 const struct of_device_id *match; 3030 3031 match = of_match_node(xilinx_dma_of_ids, np); 3032 if (match && match->data) { 3033 xdev->dma_config = match->data; 3034 clk_init = xdev->dma_config->clk_init; 3035 } 3036 } 3037 3038 err = clk_init(pdev, &xdev->axi_clk, &xdev->tx_clk, &xdev->txs_clk, 3039 &xdev->rx_clk, &xdev->rxs_clk); 3040 if (err) 3041 return err; 3042 3043 /* Request and map I/O memory */ 3044 xdev->regs = devm_platform_ioremap_resource(pdev, 0); 3045 if (IS_ERR(xdev->regs)) { 3046 err = PTR_ERR(xdev->regs); 3047 goto disable_clks; 3048 } 3049 /* Retrieve the DMA engine properties from the device tree */ 3050 xdev->max_buffer_len = GENMASK(XILINX_DMA_MAX_TRANS_LEN_MAX - 1, 0); 3051 xdev->s2mm_chan_id = xdev->dma_config->max_channels / 2; 3052 3053 if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA || 3054 xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA) { 3055 if (!of_property_read_u32(node, "xlnx,sg-length-width", 3056 &len_width)) { 3057 if (len_width < XILINX_DMA_MAX_TRANS_LEN_MIN || 3058 len_width > XILINX_DMA_V2_MAX_TRANS_LEN_MAX) { 3059 dev_warn(xdev->dev, 3060 "invalid xlnx,sg-length-width property value. Using default width\n"); 3061 } else { 3062 if (len_width > XILINX_DMA_MAX_TRANS_LEN_MAX) 3063 dev_warn(xdev->dev, "Please ensure that IP supports buffer length > 23 bits\n"); 3064 xdev->max_buffer_len = 3065 GENMASK(len_width - 1, 0); 3066 } 3067 } 3068 } 3069 3070 if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) { 3071 err = of_property_read_u32(node, "xlnx,num-fstores", 3072 &num_frames); 3073 if (err < 0) { 3074 dev_err(xdev->dev, 3075 "missing xlnx,num-fstores property\n"); 3076 goto disable_clks; 3077 } 3078 3079 err = of_property_read_u32(node, "xlnx,flush-fsync", 3080 &xdev->flush_on_fsync); 3081 if (err < 0) 3082 dev_warn(xdev->dev, 3083 "missing xlnx,flush-fsync property\n"); 3084 } 3085 3086 err = of_property_read_u32(node, "xlnx,addrwidth", &addr_width); 3087 if (err < 0) 3088 dev_warn(xdev->dev, "missing xlnx,addrwidth property\n"); 3089 3090 if (addr_width > 32) 3091 xdev->ext_addr = true; 3092 else 3093 xdev->ext_addr = false; 3094 3095 /* Set the dma mask bits */ 3096 err = dma_set_mask_and_coherent(xdev->dev, DMA_BIT_MASK(addr_width)); 3097 if (err < 0) { 3098 dev_err(xdev->dev, "DMA mask error %d\n", err); 3099 goto disable_clks; 3100 } 3101 3102 /* Initialize the DMA engine */ 3103 xdev->common.dev = &pdev->dev; 3104 3105 INIT_LIST_HEAD(&xdev->common.channels); 3106 if (!(xdev->dma_config->dmatype == XDMA_TYPE_CDMA)) { 3107 dma_cap_set(DMA_SLAVE, xdev->common.cap_mask); 3108 dma_cap_set(DMA_PRIVATE, xdev->common.cap_mask); 3109 } 3110 3111 xdev->common.device_alloc_chan_resources = 3112 xilinx_dma_alloc_chan_resources; 3113 xdev->common.device_free_chan_resources = 3114 xilinx_dma_free_chan_resources; 3115 xdev->common.device_terminate_all = xilinx_dma_terminate_all; 3116 xdev->common.device_synchronize = xilinx_dma_synchronize; 3117 xdev->common.device_tx_status = xilinx_dma_tx_status; 3118 xdev->common.device_issue_pending = xilinx_dma_issue_pending; 3119 xdev->common.device_config = xilinx_dma_device_config; 3120 if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) { 3121 dma_cap_set(DMA_CYCLIC, xdev->common.cap_mask); 3122 xdev->common.device_prep_slave_sg = xilinx_dma_prep_slave_sg; 3123 xdev->common.device_prep_dma_cyclic = 3124 xilinx_dma_prep_dma_cyclic; 3125 /* Residue calculation is supported by only AXI DMA and CDMA */ 3126 xdev->common.residue_granularity = 3127 DMA_RESIDUE_GRANULARITY_SEGMENT; 3128 } else if (xdev->dma_config->dmatype == XDMA_TYPE_CDMA) { 3129 dma_cap_set(DMA_MEMCPY, xdev->common.cap_mask); 3130 xdev->common.device_prep_dma_memcpy = xilinx_cdma_prep_memcpy; 3131 /* Residue calculation is supported by only AXI DMA and CDMA */ 3132 xdev->common.residue_granularity = 3133 DMA_RESIDUE_GRANULARITY_SEGMENT; 3134 } else if (xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA) { 3135 xdev->common.device_prep_slave_sg = xilinx_mcdma_prep_slave_sg; 3136 } else { 3137 xdev->common.device_prep_interleaved_dma = 3138 xilinx_vdma_dma_prep_interleaved; 3139 } 3140 3141 platform_set_drvdata(pdev, xdev); 3142 3143 /* Initialize the channels */ 3144 for_each_child_of_node(node, child) { 3145 err = xilinx_dma_child_probe(xdev, child); 3146 if (err < 0) 3147 goto error; 3148 } 3149 3150 if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) { 3151 for (i = 0; i < xdev->dma_config->max_channels; i++) 3152 if (xdev->chan[i]) 3153 xdev->chan[i]->num_frms = num_frames; 3154 } 3155 3156 /* Register the DMA engine with the core */ 3157 err = dma_async_device_register(&xdev->common); 3158 if (err) { 3159 dev_err(xdev->dev, "failed to register the dma device\n"); 3160 goto error; 3161 } 3162 3163 err = of_dma_controller_register(node, of_dma_xilinx_xlate, 3164 xdev); 3165 if (err < 0) { 3166 dev_err(&pdev->dev, "Unable to register DMA to DT\n"); 3167 dma_async_device_unregister(&xdev->common); 3168 goto error; 3169 } 3170 3171 if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) 3172 dev_info(&pdev->dev, "Xilinx AXI DMA Engine Driver Probed!!\n"); 3173 else if (xdev->dma_config->dmatype == XDMA_TYPE_CDMA) 3174 dev_info(&pdev->dev, "Xilinx AXI CDMA Engine Driver Probed!!\n"); 3175 else if (xdev->dma_config->dmatype == XDMA_TYPE_AXIMCDMA) 3176 dev_info(&pdev->dev, "Xilinx AXI MCDMA Engine Driver Probed!!\n"); 3177 else 3178 dev_info(&pdev->dev, "Xilinx AXI VDMA Engine Driver Probed!!\n"); 3179 3180 return 0; 3181 3182 error: 3183 for (i = 0; i < xdev->dma_config->max_channels; i++) 3184 if (xdev->chan[i]) 3185 xilinx_dma_chan_remove(xdev->chan[i]); 3186 disable_clks: 3187 xdma_disable_allclks(xdev); 3188 3189 return err; 3190 } 3191 3192 /** 3193 * xilinx_dma_remove - Driver remove function 3194 * @pdev: Pointer to the platform_device structure 3195 * 3196 * Return: Always '0' 3197 */ 3198 static int xilinx_dma_remove(struct platform_device *pdev) 3199 { 3200 struct xilinx_dma_device *xdev = platform_get_drvdata(pdev); 3201 int i; 3202 3203 of_dma_controller_free(pdev->dev.of_node); 3204 3205 dma_async_device_unregister(&xdev->common); 3206 3207 for (i = 0; i < xdev->dma_config->max_channels; i++) 3208 if (xdev->chan[i]) 3209 xilinx_dma_chan_remove(xdev->chan[i]); 3210 3211 xdma_disable_allclks(xdev); 3212 3213 return 0; 3214 } 3215 3216 static struct platform_driver xilinx_vdma_driver = { 3217 .driver = { 3218 .name = "xilinx-vdma", 3219 .of_match_table = xilinx_dma_of_ids, 3220 }, 3221 .probe = xilinx_dma_probe, 3222 .remove = xilinx_dma_remove, 3223 }; 3224 3225 module_platform_driver(xilinx_vdma_driver); 3226 3227 MODULE_AUTHOR("Xilinx, Inc."); 3228 MODULE_DESCRIPTION("Xilinx VDMA driver"); 3229 MODULE_LICENSE("GPL v2"); 3230