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