Jingchang Lu | d6be34f | 2014-02-18 10:17:12 +0800 | [diff] [blame] | 1 | /* |
| 2 | * drivers/dma/fsl-edma.c |
| 3 | * |
| 4 | * Copyright 2013-2014 Freescale Semiconductor, Inc. |
| 5 | * |
| 6 | * Driver for the Freescale eDMA engine with flexible channel multiplexing |
| 7 | * capability for DMA request sources. The eDMA block can be found on some |
| 8 | * Vybrid and Layerscape SoCs. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify it |
| 11 | * under the terms of the GNU General Public License as published by the |
| 12 | * Free Software Foundation; either version 2 of the License, or (at your |
| 13 | * option) any later version. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/interrupt.h> |
| 19 | #include <linux/clk.h> |
| 20 | #include <linux/dma-mapping.h> |
| 21 | #include <linux/dmapool.h> |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/spinlock.h> |
| 24 | #include <linux/of.h> |
| 25 | #include <linux/of_device.h> |
| 26 | #include <linux/of_address.h> |
| 27 | #include <linux/of_irq.h> |
| 28 | #include <linux/of_dma.h> |
| 29 | |
| 30 | #include "virt-dma.h" |
| 31 | |
| 32 | #define EDMA_CR 0x00 |
| 33 | #define EDMA_ES 0x04 |
| 34 | #define EDMA_ERQ 0x0C |
| 35 | #define EDMA_EEI 0x14 |
| 36 | #define EDMA_SERQ 0x1B |
| 37 | #define EDMA_CERQ 0x1A |
| 38 | #define EDMA_SEEI 0x19 |
| 39 | #define EDMA_CEEI 0x18 |
| 40 | #define EDMA_CINT 0x1F |
| 41 | #define EDMA_CERR 0x1E |
| 42 | #define EDMA_SSRT 0x1D |
| 43 | #define EDMA_CDNE 0x1C |
| 44 | #define EDMA_INTR 0x24 |
| 45 | #define EDMA_ERR 0x2C |
| 46 | |
| 47 | #define EDMA_TCD_SADDR(x) (0x1000 + 32 * (x)) |
| 48 | #define EDMA_TCD_SOFF(x) (0x1004 + 32 * (x)) |
| 49 | #define EDMA_TCD_ATTR(x) (0x1006 + 32 * (x)) |
| 50 | #define EDMA_TCD_NBYTES(x) (0x1008 + 32 * (x)) |
| 51 | #define EDMA_TCD_SLAST(x) (0x100C + 32 * (x)) |
| 52 | #define EDMA_TCD_DADDR(x) (0x1010 + 32 * (x)) |
| 53 | #define EDMA_TCD_DOFF(x) (0x1014 + 32 * (x)) |
| 54 | #define EDMA_TCD_CITER_ELINK(x) (0x1016 + 32 * (x)) |
| 55 | #define EDMA_TCD_CITER(x) (0x1016 + 32 * (x)) |
| 56 | #define EDMA_TCD_DLAST_SGA(x) (0x1018 + 32 * (x)) |
| 57 | #define EDMA_TCD_CSR(x) (0x101C + 32 * (x)) |
| 58 | #define EDMA_TCD_BITER_ELINK(x) (0x101E + 32 * (x)) |
| 59 | #define EDMA_TCD_BITER(x) (0x101E + 32 * (x)) |
| 60 | |
| 61 | #define EDMA_CR_EDBG BIT(1) |
| 62 | #define EDMA_CR_ERCA BIT(2) |
| 63 | #define EDMA_CR_ERGA BIT(3) |
| 64 | #define EDMA_CR_HOE BIT(4) |
| 65 | #define EDMA_CR_HALT BIT(5) |
| 66 | #define EDMA_CR_CLM BIT(6) |
| 67 | #define EDMA_CR_EMLM BIT(7) |
| 68 | #define EDMA_CR_ECX BIT(16) |
| 69 | #define EDMA_CR_CX BIT(17) |
| 70 | |
| 71 | #define EDMA_SEEI_SEEI(x) ((x) & 0x1F) |
| 72 | #define EDMA_CEEI_CEEI(x) ((x) & 0x1F) |
| 73 | #define EDMA_CINT_CINT(x) ((x) & 0x1F) |
| 74 | #define EDMA_CERR_CERR(x) ((x) & 0x1F) |
| 75 | |
| 76 | #define EDMA_TCD_ATTR_DSIZE(x) (((x) & 0x0007)) |
| 77 | #define EDMA_TCD_ATTR_DMOD(x) (((x) & 0x001F) << 3) |
| 78 | #define EDMA_TCD_ATTR_SSIZE(x) (((x) & 0x0007) << 8) |
| 79 | #define EDMA_TCD_ATTR_SMOD(x) (((x) & 0x001F) << 11) |
| 80 | #define EDMA_TCD_ATTR_SSIZE_8BIT (0x0000) |
| 81 | #define EDMA_TCD_ATTR_SSIZE_16BIT (0x0100) |
| 82 | #define EDMA_TCD_ATTR_SSIZE_32BIT (0x0200) |
| 83 | #define EDMA_TCD_ATTR_SSIZE_64BIT (0x0300) |
| 84 | #define EDMA_TCD_ATTR_SSIZE_32BYTE (0x0500) |
| 85 | #define EDMA_TCD_ATTR_DSIZE_8BIT (0x0000) |
| 86 | #define EDMA_TCD_ATTR_DSIZE_16BIT (0x0001) |
| 87 | #define EDMA_TCD_ATTR_DSIZE_32BIT (0x0002) |
| 88 | #define EDMA_TCD_ATTR_DSIZE_64BIT (0x0003) |
| 89 | #define EDMA_TCD_ATTR_DSIZE_32BYTE (0x0005) |
| 90 | |
| 91 | #define EDMA_TCD_SOFF_SOFF(x) (x) |
| 92 | #define EDMA_TCD_NBYTES_NBYTES(x) (x) |
| 93 | #define EDMA_TCD_SLAST_SLAST(x) (x) |
| 94 | #define EDMA_TCD_DADDR_DADDR(x) (x) |
| 95 | #define EDMA_TCD_CITER_CITER(x) ((x) & 0x7FFF) |
| 96 | #define EDMA_TCD_DOFF_DOFF(x) (x) |
| 97 | #define EDMA_TCD_DLAST_SGA_DLAST_SGA(x) (x) |
| 98 | #define EDMA_TCD_BITER_BITER(x) ((x) & 0x7FFF) |
| 99 | |
| 100 | #define EDMA_TCD_CSR_START BIT(0) |
| 101 | #define EDMA_TCD_CSR_INT_MAJOR BIT(1) |
| 102 | #define EDMA_TCD_CSR_INT_HALF BIT(2) |
| 103 | #define EDMA_TCD_CSR_D_REQ BIT(3) |
| 104 | #define EDMA_TCD_CSR_E_SG BIT(4) |
| 105 | #define EDMA_TCD_CSR_E_LINK BIT(5) |
| 106 | #define EDMA_TCD_CSR_ACTIVE BIT(6) |
| 107 | #define EDMA_TCD_CSR_DONE BIT(7) |
| 108 | |
| 109 | #define EDMAMUX_CHCFG_DIS 0x0 |
| 110 | #define EDMAMUX_CHCFG_ENBL 0x80 |
| 111 | #define EDMAMUX_CHCFG_SOURCE(n) ((n) & 0x3F) |
| 112 | |
| 113 | #define DMAMUX_NR 2 |
| 114 | |
| 115 | #define FSL_EDMA_BUSWIDTHS BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ |
| 116 | BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ |
| 117 | BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \ |
| 118 | BIT(DMA_SLAVE_BUSWIDTH_8_BYTES) |
| 119 | |
| 120 | struct fsl_edma_hw_tcd { |
| 121 | u32 saddr; |
| 122 | u16 soff; |
| 123 | u16 attr; |
| 124 | u32 nbytes; |
| 125 | u32 slast; |
| 126 | u32 daddr; |
| 127 | u16 doff; |
| 128 | u16 citer; |
| 129 | u32 dlast_sga; |
| 130 | u16 csr; |
| 131 | u16 biter; |
| 132 | }; |
| 133 | |
| 134 | struct fsl_edma_sw_tcd { |
| 135 | dma_addr_t ptcd; |
| 136 | struct fsl_edma_hw_tcd *vtcd; |
| 137 | }; |
| 138 | |
| 139 | struct fsl_edma_slave_config { |
| 140 | enum dma_transfer_direction dir; |
| 141 | enum dma_slave_buswidth addr_width; |
| 142 | u32 dev_addr; |
| 143 | u32 burst; |
| 144 | u32 attr; |
| 145 | }; |
| 146 | |
| 147 | struct fsl_edma_chan { |
| 148 | struct virt_dma_chan vchan; |
| 149 | enum dma_status status; |
| 150 | struct fsl_edma_engine *edma; |
| 151 | struct fsl_edma_desc *edesc; |
| 152 | struct fsl_edma_slave_config fsc; |
| 153 | struct dma_pool *tcd_pool; |
| 154 | }; |
| 155 | |
| 156 | struct fsl_edma_desc { |
| 157 | struct virt_dma_desc vdesc; |
| 158 | struct fsl_edma_chan *echan; |
| 159 | bool iscyclic; |
| 160 | unsigned int n_tcds; |
| 161 | struct fsl_edma_sw_tcd tcd[]; |
| 162 | }; |
| 163 | |
| 164 | struct fsl_edma_engine { |
| 165 | struct dma_device dma_dev; |
| 166 | void __iomem *membase; |
| 167 | void __iomem *muxbase[DMAMUX_NR]; |
| 168 | struct clk *muxclk[DMAMUX_NR]; |
| 169 | struct mutex fsl_edma_mutex; |
| 170 | u32 n_chans; |
| 171 | int txirq; |
| 172 | int errirq; |
| 173 | bool big_endian; |
| 174 | struct fsl_edma_chan chans[]; |
| 175 | }; |
| 176 | |
| 177 | /* |
| 178 | * R/W functions for big- or little-endian registers |
| 179 | * the eDMA controller's endian is independent of the CPU core's endian. |
| 180 | */ |
| 181 | |
| 182 | static u16 edma_readw(struct fsl_edma_engine *edma, void __iomem *addr) |
| 183 | { |
| 184 | if (edma->big_endian) |
| 185 | return ioread16be(addr); |
| 186 | else |
| 187 | return ioread16(addr); |
| 188 | } |
| 189 | |
| 190 | static u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr) |
| 191 | { |
| 192 | if (edma->big_endian) |
| 193 | return ioread32be(addr); |
| 194 | else |
| 195 | return ioread32(addr); |
| 196 | } |
| 197 | |
| 198 | static void edma_writeb(struct fsl_edma_engine *edma, u8 val, void __iomem *addr) |
| 199 | { |
| 200 | iowrite8(val, addr); |
| 201 | } |
| 202 | |
| 203 | static void edma_writew(struct fsl_edma_engine *edma, u16 val, void __iomem *addr) |
| 204 | { |
| 205 | if (edma->big_endian) |
| 206 | iowrite16be(val, addr); |
| 207 | else |
| 208 | iowrite16(val, addr); |
| 209 | } |
| 210 | |
| 211 | static void edma_writel(struct fsl_edma_engine *edma, u32 val, void __iomem *addr) |
| 212 | { |
| 213 | if (edma->big_endian) |
| 214 | iowrite32be(val, addr); |
| 215 | else |
| 216 | iowrite32(val, addr); |
| 217 | } |
| 218 | |
| 219 | static struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan) |
| 220 | { |
| 221 | return container_of(chan, struct fsl_edma_chan, vchan.chan); |
| 222 | } |
| 223 | |
| 224 | static struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd) |
| 225 | { |
| 226 | return container_of(vd, struct fsl_edma_desc, vdesc); |
| 227 | } |
| 228 | |
| 229 | static void fsl_edma_enable_request(struct fsl_edma_chan *fsl_chan) |
| 230 | { |
| 231 | void __iomem *addr = fsl_chan->edma->membase; |
| 232 | u32 ch = fsl_chan->vchan.chan.chan_id; |
| 233 | |
| 234 | edma_writeb(fsl_chan->edma, EDMA_SEEI_SEEI(ch), addr + EDMA_SEEI); |
| 235 | edma_writeb(fsl_chan->edma, ch, addr + EDMA_SERQ); |
| 236 | } |
| 237 | |
| 238 | static void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan) |
| 239 | { |
| 240 | void __iomem *addr = fsl_chan->edma->membase; |
| 241 | u32 ch = fsl_chan->vchan.chan.chan_id; |
| 242 | |
| 243 | edma_writeb(fsl_chan->edma, ch, addr + EDMA_CERQ); |
| 244 | edma_writeb(fsl_chan->edma, EDMA_CEEI_CEEI(ch), addr + EDMA_CEEI); |
| 245 | } |
| 246 | |
| 247 | static void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan, |
| 248 | unsigned int slot, bool enable) |
| 249 | { |
| 250 | u32 ch = fsl_chan->vchan.chan.chan_id; |
Jingchang Lu | 211bfef | 2014-07-01 16:41:03 +0800 | [diff] [blame] | 251 | void __iomem *muxaddr; |
Jingchang Lu | d6be34f | 2014-02-18 10:17:12 +0800 | [diff] [blame] | 252 | unsigned chans_per_mux, ch_off; |
| 253 | |
| 254 | chans_per_mux = fsl_chan->edma->n_chans / DMAMUX_NR; |
| 255 | ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux; |
Jingchang Lu | 211bfef | 2014-07-01 16:41:03 +0800 | [diff] [blame] | 256 | muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux]; |
Jingchang Lu | d6be34f | 2014-02-18 10:17:12 +0800 | [diff] [blame] | 257 | |
| 258 | if (enable) |
| 259 | edma_writeb(fsl_chan->edma, |
| 260 | EDMAMUX_CHCFG_ENBL | EDMAMUX_CHCFG_SOURCE(slot), |
| 261 | muxaddr + ch_off); |
| 262 | else |
| 263 | edma_writeb(fsl_chan->edma, EDMAMUX_CHCFG_DIS, muxaddr + ch_off); |
| 264 | } |
| 265 | |
| 266 | static unsigned int fsl_edma_get_tcd_attr(enum dma_slave_buswidth addr_width) |
| 267 | { |
| 268 | switch (addr_width) { |
| 269 | case 1: |
| 270 | return EDMA_TCD_ATTR_SSIZE_8BIT | EDMA_TCD_ATTR_DSIZE_8BIT; |
| 271 | case 2: |
| 272 | return EDMA_TCD_ATTR_SSIZE_16BIT | EDMA_TCD_ATTR_DSIZE_16BIT; |
| 273 | case 4: |
| 274 | return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT; |
| 275 | case 8: |
| 276 | return EDMA_TCD_ATTR_SSIZE_64BIT | EDMA_TCD_ATTR_DSIZE_64BIT; |
| 277 | default: |
| 278 | return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT; |
| 279 | } |
| 280 | } |
| 281 | |
| 282 | static void fsl_edma_free_desc(struct virt_dma_desc *vdesc) |
| 283 | { |
| 284 | struct fsl_edma_desc *fsl_desc; |
| 285 | int i; |
| 286 | |
| 287 | fsl_desc = to_fsl_edma_desc(vdesc); |
| 288 | for (i = 0; i < fsl_desc->n_tcds; i++) |
| 289 | dma_pool_free(fsl_desc->echan->tcd_pool, |
| 290 | fsl_desc->tcd[i].vtcd, |
| 291 | fsl_desc->tcd[i].ptcd); |
| 292 | kfree(fsl_desc); |
| 293 | } |
| 294 | |
| 295 | static int fsl_edma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, |
| 296 | unsigned long arg) |
| 297 | { |
| 298 | struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); |
| 299 | struct dma_slave_config *cfg = (void *)arg; |
| 300 | unsigned long flags; |
| 301 | LIST_HEAD(head); |
| 302 | |
| 303 | switch (cmd) { |
| 304 | case DMA_TERMINATE_ALL: |
| 305 | spin_lock_irqsave(&fsl_chan->vchan.lock, flags); |
| 306 | fsl_edma_disable_request(fsl_chan); |
| 307 | fsl_chan->edesc = NULL; |
| 308 | vchan_get_all_descriptors(&fsl_chan->vchan, &head); |
| 309 | spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); |
| 310 | vchan_dma_desc_free_list(&fsl_chan->vchan, &head); |
| 311 | return 0; |
| 312 | |
| 313 | case DMA_SLAVE_CONFIG: |
| 314 | fsl_chan->fsc.dir = cfg->direction; |
| 315 | if (cfg->direction == DMA_DEV_TO_MEM) { |
| 316 | fsl_chan->fsc.dev_addr = cfg->src_addr; |
| 317 | fsl_chan->fsc.addr_width = cfg->src_addr_width; |
| 318 | fsl_chan->fsc.burst = cfg->src_maxburst; |
| 319 | fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->src_addr_width); |
| 320 | } else if (cfg->direction == DMA_MEM_TO_DEV) { |
| 321 | fsl_chan->fsc.dev_addr = cfg->dst_addr; |
| 322 | fsl_chan->fsc.addr_width = cfg->dst_addr_width; |
| 323 | fsl_chan->fsc.burst = cfg->dst_maxburst; |
| 324 | fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->dst_addr_width); |
| 325 | } else { |
| 326 | return -EINVAL; |
| 327 | } |
| 328 | return 0; |
| 329 | |
| 330 | case DMA_PAUSE: |
| 331 | spin_lock_irqsave(&fsl_chan->vchan.lock, flags); |
| 332 | if (fsl_chan->edesc) { |
| 333 | fsl_edma_disable_request(fsl_chan); |
| 334 | fsl_chan->status = DMA_PAUSED; |
| 335 | } |
| 336 | spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); |
| 337 | return 0; |
| 338 | |
| 339 | case DMA_RESUME: |
| 340 | spin_lock_irqsave(&fsl_chan->vchan.lock, flags); |
| 341 | if (fsl_chan->edesc) { |
| 342 | fsl_edma_enable_request(fsl_chan); |
| 343 | fsl_chan->status = DMA_IN_PROGRESS; |
| 344 | } |
| 345 | spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); |
| 346 | return 0; |
| 347 | |
| 348 | default: |
| 349 | return -ENXIO; |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan, |
| 354 | struct virt_dma_desc *vdesc, bool in_progress) |
| 355 | { |
| 356 | struct fsl_edma_desc *edesc = fsl_chan->edesc; |
| 357 | void __iomem *addr = fsl_chan->edma->membase; |
| 358 | u32 ch = fsl_chan->vchan.chan.chan_id; |
| 359 | enum dma_transfer_direction dir = fsl_chan->fsc.dir; |
| 360 | dma_addr_t cur_addr, dma_addr; |
| 361 | size_t len, size; |
| 362 | int i; |
| 363 | |
| 364 | /* calculate the total size in this desc */ |
| 365 | for (len = i = 0; i < fsl_chan->edesc->n_tcds; i++) |
| 366 | len += edma_readl(fsl_chan->edma, &(edesc->tcd[i].vtcd->nbytes)) |
| 367 | * edma_readw(fsl_chan->edma, &(edesc->tcd[i].vtcd->biter)); |
| 368 | |
| 369 | if (!in_progress) |
| 370 | return len; |
| 371 | |
| 372 | if (dir == DMA_MEM_TO_DEV) |
| 373 | cur_addr = edma_readl(fsl_chan->edma, addr + EDMA_TCD_SADDR(ch)); |
| 374 | else |
| 375 | cur_addr = edma_readl(fsl_chan->edma, addr + EDMA_TCD_DADDR(ch)); |
| 376 | |
| 377 | /* figure out the finished and calculate the residue */ |
| 378 | for (i = 0; i < fsl_chan->edesc->n_tcds; i++) { |
| 379 | size = edma_readl(fsl_chan->edma, &(edesc->tcd[i].vtcd->nbytes)) |
| 380 | * edma_readw(fsl_chan->edma, &(edesc->tcd[i].vtcd->biter)); |
| 381 | if (dir == DMA_MEM_TO_DEV) |
| 382 | dma_addr = edma_readl(fsl_chan->edma, |
| 383 | &(edesc->tcd[i].vtcd->saddr)); |
| 384 | else |
| 385 | dma_addr = edma_readl(fsl_chan->edma, |
| 386 | &(edesc->tcd[i].vtcd->daddr)); |
| 387 | |
| 388 | len -= size; |
| 389 | if (cur_addr > dma_addr && cur_addr < dma_addr + size) { |
| 390 | len += dma_addr + size - cur_addr; |
| 391 | break; |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | return len; |
| 396 | } |
| 397 | |
| 398 | static enum dma_status fsl_edma_tx_status(struct dma_chan *chan, |
| 399 | dma_cookie_t cookie, struct dma_tx_state *txstate) |
| 400 | { |
| 401 | struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); |
| 402 | struct virt_dma_desc *vdesc; |
| 403 | enum dma_status status; |
| 404 | unsigned long flags; |
| 405 | |
| 406 | status = dma_cookie_status(chan, cookie, txstate); |
| 407 | if (status == DMA_COMPLETE) |
| 408 | return status; |
| 409 | |
| 410 | if (!txstate) |
| 411 | return fsl_chan->status; |
| 412 | |
| 413 | spin_lock_irqsave(&fsl_chan->vchan.lock, flags); |
| 414 | vdesc = vchan_find_desc(&fsl_chan->vchan, cookie); |
| 415 | if (fsl_chan->edesc && cookie == fsl_chan->edesc->vdesc.tx.cookie) |
| 416 | txstate->residue = fsl_edma_desc_residue(fsl_chan, vdesc, true); |
| 417 | else if (vdesc) |
| 418 | txstate->residue = fsl_edma_desc_residue(fsl_chan, vdesc, false); |
| 419 | else |
| 420 | txstate->residue = 0; |
| 421 | |
| 422 | spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); |
| 423 | |
| 424 | return fsl_chan->status; |
| 425 | } |
| 426 | |
| 427 | static void fsl_edma_set_tcd_params(struct fsl_edma_chan *fsl_chan, |
| 428 | u32 src, u32 dst, u16 attr, u16 soff, u32 nbytes, |
| 429 | u32 slast, u16 citer, u16 biter, u32 doff, u32 dlast_sga, |
| 430 | u16 csr) |
| 431 | { |
| 432 | void __iomem *addr = fsl_chan->edma->membase; |
| 433 | u32 ch = fsl_chan->vchan.chan.chan_id; |
| 434 | |
| 435 | /* |
| 436 | * TCD parameters have been swapped in fill_tcd_params(), |
| 437 | * so just write them to registers in the cpu endian here |
| 438 | */ |
| 439 | writew(0, addr + EDMA_TCD_CSR(ch)); |
| 440 | writel(src, addr + EDMA_TCD_SADDR(ch)); |
| 441 | writel(dst, addr + EDMA_TCD_DADDR(ch)); |
| 442 | writew(attr, addr + EDMA_TCD_ATTR(ch)); |
| 443 | writew(soff, addr + EDMA_TCD_SOFF(ch)); |
| 444 | writel(nbytes, addr + EDMA_TCD_NBYTES(ch)); |
| 445 | writel(slast, addr + EDMA_TCD_SLAST(ch)); |
| 446 | writew(citer, addr + EDMA_TCD_CITER(ch)); |
| 447 | writew(biter, addr + EDMA_TCD_BITER(ch)); |
| 448 | writew(doff, addr + EDMA_TCD_DOFF(ch)); |
| 449 | writel(dlast_sga, addr + EDMA_TCD_DLAST_SGA(ch)); |
| 450 | writew(csr, addr + EDMA_TCD_CSR(ch)); |
| 451 | } |
| 452 | |
| 453 | static void fill_tcd_params(struct fsl_edma_engine *edma, |
| 454 | struct fsl_edma_hw_tcd *tcd, u32 src, u32 dst, |
| 455 | u16 attr, u16 soff, u32 nbytes, u32 slast, u16 citer, |
| 456 | u16 biter, u16 doff, u32 dlast_sga, bool major_int, |
| 457 | bool disable_req, bool enable_sg) |
| 458 | { |
| 459 | u16 csr = 0; |
| 460 | |
| 461 | /* |
| 462 | * eDMA hardware SGs require the TCD parameters stored in memory |
| 463 | * the same endian as the eDMA module so that they can be loaded |
| 464 | * automatically by the engine |
| 465 | */ |
| 466 | edma_writel(edma, src, &(tcd->saddr)); |
| 467 | edma_writel(edma, dst, &(tcd->daddr)); |
| 468 | edma_writew(edma, attr, &(tcd->attr)); |
| 469 | edma_writew(edma, EDMA_TCD_SOFF_SOFF(soff), &(tcd->soff)); |
| 470 | edma_writel(edma, EDMA_TCD_NBYTES_NBYTES(nbytes), &(tcd->nbytes)); |
| 471 | edma_writel(edma, EDMA_TCD_SLAST_SLAST(slast), &(tcd->slast)); |
| 472 | edma_writew(edma, EDMA_TCD_CITER_CITER(citer), &(tcd->citer)); |
| 473 | edma_writew(edma, EDMA_TCD_DOFF_DOFF(doff), &(tcd->doff)); |
| 474 | edma_writel(edma, EDMA_TCD_DLAST_SGA_DLAST_SGA(dlast_sga), &(tcd->dlast_sga)); |
| 475 | edma_writew(edma, EDMA_TCD_BITER_BITER(biter), &(tcd->biter)); |
| 476 | if (major_int) |
| 477 | csr |= EDMA_TCD_CSR_INT_MAJOR; |
| 478 | |
| 479 | if (disable_req) |
| 480 | csr |= EDMA_TCD_CSR_D_REQ; |
| 481 | |
| 482 | if (enable_sg) |
| 483 | csr |= EDMA_TCD_CSR_E_SG; |
| 484 | |
| 485 | edma_writew(edma, csr, &(tcd->csr)); |
| 486 | } |
| 487 | |
| 488 | static struct fsl_edma_desc *fsl_edma_alloc_desc(struct fsl_edma_chan *fsl_chan, |
| 489 | int sg_len) |
| 490 | { |
| 491 | struct fsl_edma_desc *fsl_desc; |
| 492 | int i; |
| 493 | |
| 494 | fsl_desc = kzalloc(sizeof(*fsl_desc) + sizeof(struct fsl_edma_sw_tcd) * sg_len, |
| 495 | GFP_NOWAIT); |
| 496 | if (!fsl_desc) |
| 497 | return NULL; |
| 498 | |
| 499 | fsl_desc->echan = fsl_chan; |
| 500 | fsl_desc->n_tcds = sg_len; |
| 501 | for (i = 0; i < sg_len; i++) { |
| 502 | fsl_desc->tcd[i].vtcd = dma_pool_alloc(fsl_chan->tcd_pool, |
| 503 | GFP_NOWAIT, &fsl_desc->tcd[i].ptcd); |
| 504 | if (!fsl_desc->tcd[i].vtcd) |
| 505 | goto err; |
| 506 | } |
| 507 | return fsl_desc; |
| 508 | |
| 509 | err: |
| 510 | while (--i >= 0) |
| 511 | dma_pool_free(fsl_chan->tcd_pool, fsl_desc->tcd[i].vtcd, |
| 512 | fsl_desc->tcd[i].ptcd); |
| 513 | kfree(fsl_desc); |
| 514 | return NULL; |
| 515 | } |
| 516 | |
| 517 | static struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic( |
| 518 | struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, |
| 519 | size_t period_len, enum dma_transfer_direction direction, |
Laurent Pinchart | 31c1e5a | 2014-08-01 12:20:10 +0200 | [diff] [blame] | 520 | unsigned long flags) |
Jingchang Lu | d6be34f | 2014-02-18 10:17:12 +0800 | [diff] [blame] | 521 | { |
| 522 | struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); |
| 523 | struct fsl_edma_desc *fsl_desc; |
| 524 | dma_addr_t dma_buf_next; |
| 525 | int sg_len, i; |
| 526 | u32 src_addr, dst_addr, last_sg, nbytes; |
| 527 | u16 soff, doff, iter; |
| 528 | |
| 529 | if (!is_slave_direction(fsl_chan->fsc.dir)) |
| 530 | return NULL; |
| 531 | |
| 532 | sg_len = buf_len / period_len; |
| 533 | fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len); |
| 534 | if (!fsl_desc) |
| 535 | return NULL; |
| 536 | fsl_desc->iscyclic = true; |
| 537 | |
| 538 | dma_buf_next = dma_addr; |
| 539 | nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst; |
| 540 | iter = period_len / nbytes; |
| 541 | |
| 542 | for (i = 0; i < sg_len; i++) { |
| 543 | if (dma_buf_next >= dma_addr + buf_len) |
| 544 | dma_buf_next = dma_addr; |
| 545 | |
| 546 | /* get next sg's physical address */ |
| 547 | last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd; |
| 548 | |
| 549 | if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) { |
| 550 | src_addr = dma_buf_next; |
| 551 | dst_addr = fsl_chan->fsc.dev_addr; |
| 552 | soff = fsl_chan->fsc.addr_width; |
| 553 | doff = 0; |
| 554 | } else { |
| 555 | src_addr = fsl_chan->fsc.dev_addr; |
| 556 | dst_addr = dma_buf_next; |
| 557 | soff = 0; |
| 558 | doff = fsl_chan->fsc.addr_width; |
| 559 | } |
| 560 | |
| 561 | fill_tcd_params(fsl_chan->edma, fsl_desc->tcd[i].vtcd, src_addr, |
| 562 | dst_addr, fsl_chan->fsc.attr, soff, nbytes, 0, |
| 563 | iter, iter, doff, last_sg, true, false, true); |
| 564 | dma_buf_next += period_len; |
| 565 | } |
| 566 | |
| 567 | return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags); |
| 568 | } |
| 569 | |
| 570 | static struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg( |
| 571 | struct dma_chan *chan, struct scatterlist *sgl, |
| 572 | unsigned int sg_len, enum dma_transfer_direction direction, |
| 573 | unsigned long flags, void *context) |
| 574 | { |
| 575 | struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); |
| 576 | struct fsl_edma_desc *fsl_desc; |
| 577 | struct scatterlist *sg; |
| 578 | u32 src_addr, dst_addr, last_sg, nbytes; |
| 579 | u16 soff, doff, iter; |
| 580 | int i; |
| 581 | |
| 582 | if (!is_slave_direction(fsl_chan->fsc.dir)) |
| 583 | return NULL; |
| 584 | |
| 585 | fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len); |
| 586 | if (!fsl_desc) |
| 587 | return NULL; |
| 588 | fsl_desc->iscyclic = false; |
| 589 | |
| 590 | nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst; |
| 591 | for_each_sg(sgl, sg, sg_len, i) { |
| 592 | /* get next sg's physical address */ |
| 593 | last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd; |
| 594 | |
| 595 | if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) { |
| 596 | src_addr = sg_dma_address(sg); |
| 597 | dst_addr = fsl_chan->fsc.dev_addr; |
| 598 | soff = fsl_chan->fsc.addr_width; |
| 599 | doff = 0; |
| 600 | } else { |
| 601 | src_addr = fsl_chan->fsc.dev_addr; |
| 602 | dst_addr = sg_dma_address(sg); |
| 603 | soff = 0; |
| 604 | doff = fsl_chan->fsc.addr_width; |
| 605 | } |
| 606 | |
| 607 | iter = sg_dma_len(sg) / nbytes; |
| 608 | if (i < sg_len - 1) { |
| 609 | last_sg = fsl_desc->tcd[(i + 1)].ptcd; |
| 610 | fill_tcd_params(fsl_chan->edma, fsl_desc->tcd[i].vtcd, |
| 611 | src_addr, dst_addr, fsl_chan->fsc.attr, |
| 612 | soff, nbytes, 0, iter, iter, doff, last_sg, |
| 613 | false, false, true); |
| 614 | } else { |
| 615 | last_sg = 0; |
| 616 | fill_tcd_params(fsl_chan->edma, fsl_desc->tcd[i].vtcd, |
| 617 | src_addr, dst_addr, fsl_chan->fsc.attr, |
| 618 | soff, nbytes, 0, iter, iter, doff, last_sg, |
| 619 | true, true, false); |
| 620 | } |
| 621 | } |
| 622 | |
| 623 | return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags); |
| 624 | } |
| 625 | |
| 626 | static void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan) |
| 627 | { |
| 628 | struct fsl_edma_hw_tcd *tcd; |
| 629 | struct virt_dma_desc *vdesc; |
| 630 | |
| 631 | vdesc = vchan_next_desc(&fsl_chan->vchan); |
| 632 | if (!vdesc) |
| 633 | return; |
| 634 | fsl_chan->edesc = to_fsl_edma_desc(vdesc); |
| 635 | tcd = fsl_chan->edesc->tcd[0].vtcd; |
| 636 | fsl_edma_set_tcd_params(fsl_chan, tcd->saddr, tcd->daddr, tcd->attr, |
| 637 | tcd->soff, tcd->nbytes, tcd->slast, tcd->citer, |
| 638 | tcd->biter, tcd->doff, tcd->dlast_sga, tcd->csr); |
| 639 | fsl_edma_enable_request(fsl_chan); |
| 640 | fsl_chan->status = DMA_IN_PROGRESS; |
| 641 | } |
| 642 | |
| 643 | static irqreturn_t fsl_edma_tx_handler(int irq, void *dev_id) |
| 644 | { |
| 645 | struct fsl_edma_engine *fsl_edma = dev_id; |
| 646 | unsigned int intr, ch; |
| 647 | void __iomem *base_addr; |
| 648 | struct fsl_edma_chan *fsl_chan; |
| 649 | |
| 650 | base_addr = fsl_edma->membase; |
| 651 | |
| 652 | intr = edma_readl(fsl_edma, base_addr + EDMA_INTR); |
| 653 | if (!intr) |
| 654 | return IRQ_NONE; |
| 655 | |
| 656 | for (ch = 0; ch < fsl_edma->n_chans; ch++) { |
| 657 | if (intr & (0x1 << ch)) { |
| 658 | edma_writeb(fsl_edma, EDMA_CINT_CINT(ch), |
| 659 | base_addr + EDMA_CINT); |
| 660 | |
| 661 | fsl_chan = &fsl_edma->chans[ch]; |
| 662 | |
| 663 | spin_lock(&fsl_chan->vchan.lock); |
| 664 | if (!fsl_chan->edesc->iscyclic) { |
| 665 | list_del(&fsl_chan->edesc->vdesc.node); |
| 666 | vchan_cookie_complete(&fsl_chan->edesc->vdesc); |
| 667 | fsl_chan->edesc = NULL; |
| 668 | fsl_chan->status = DMA_COMPLETE; |
| 669 | } else { |
| 670 | vchan_cyclic_callback(&fsl_chan->edesc->vdesc); |
| 671 | } |
| 672 | |
| 673 | if (!fsl_chan->edesc) |
| 674 | fsl_edma_xfer_desc(fsl_chan); |
| 675 | |
| 676 | spin_unlock(&fsl_chan->vchan.lock); |
| 677 | } |
| 678 | } |
| 679 | return IRQ_HANDLED; |
| 680 | } |
| 681 | |
| 682 | static irqreturn_t fsl_edma_err_handler(int irq, void *dev_id) |
| 683 | { |
| 684 | struct fsl_edma_engine *fsl_edma = dev_id; |
| 685 | unsigned int err, ch; |
| 686 | |
| 687 | err = edma_readl(fsl_edma, fsl_edma->membase + EDMA_ERR); |
| 688 | if (!err) |
| 689 | return IRQ_NONE; |
| 690 | |
| 691 | for (ch = 0; ch < fsl_edma->n_chans; ch++) { |
| 692 | if (err & (0x1 << ch)) { |
| 693 | fsl_edma_disable_request(&fsl_edma->chans[ch]); |
| 694 | edma_writeb(fsl_edma, EDMA_CERR_CERR(ch), |
| 695 | fsl_edma->membase + EDMA_CERR); |
| 696 | fsl_edma->chans[ch].status = DMA_ERROR; |
| 697 | } |
| 698 | } |
| 699 | return IRQ_HANDLED; |
| 700 | } |
| 701 | |
| 702 | static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id) |
| 703 | { |
| 704 | if (fsl_edma_tx_handler(irq, dev_id) == IRQ_HANDLED) |
| 705 | return IRQ_HANDLED; |
| 706 | |
| 707 | return fsl_edma_err_handler(irq, dev_id); |
| 708 | } |
| 709 | |
| 710 | static void fsl_edma_issue_pending(struct dma_chan *chan) |
| 711 | { |
| 712 | struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); |
| 713 | unsigned long flags; |
| 714 | |
| 715 | spin_lock_irqsave(&fsl_chan->vchan.lock, flags); |
| 716 | |
| 717 | if (vchan_issue_pending(&fsl_chan->vchan) && !fsl_chan->edesc) |
| 718 | fsl_edma_xfer_desc(fsl_chan); |
| 719 | |
| 720 | spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); |
| 721 | } |
| 722 | |
| 723 | static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec, |
| 724 | struct of_dma *ofdma) |
| 725 | { |
| 726 | struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data; |
Jingchang Lu | 178c81e | 2014-02-21 14:50:06 +0800 | [diff] [blame] | 727 | struct dma_chan *chan, *_chan; |
Jingchang Lu | 211bfef | 2014-07-01 16:41:03 +0800 | [diff] [blame] | 728 | unsigned long chans_per_mux = fsl_edma->n_chans / DMAMUX_NR; |
Jingchang Lu | d6be34f | 2014-02-18 10:17:12 +0800 | [diff] [blame] | 729 | |
| 730 | if (dma_spec->args_count != 2) |
| 731 | return NULL; |
| 732 | |
| 733 | mutex_lock(&fsl_edma->fsl_edma_mutex); |
Jingchang Lu | 178c81e | 2014-02-21 14:50:06 +0800 | [diff] [blame] | 734 | list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) { |
Jingchang Lu | d6be34f | 2014-02-18 10:17:12 +0800 | [diff] [blame] | 735 | if (chan->client_count) |
| 736 | continue; |
Jingchang Lu | 211bfef | 2014-07-01 16:41:03 +0800 | [diff] [blame] | 737 | if ((chan->chan_id / chans_per_mux) == dma_spec->args[0]) { |
Jingchang Lu | d6be34f | 2014-02-18 10:17:12 +0800 | [diff] [blame] | 738 | chan = dma_get_slave_channel(chan); |
| 739 | if (chan) { |
| 740 | chan->device->privatecnt++; |
| 741 | fsl_edma_chan_mux(to_fsl_edma_chan(chan), |
| 742 | dma_spec->args[1], true); |
| 743 | mutex_unlock(&fsl_edma->fsl_edma_mutex); |
| 744 | return chan; |
| 745 | } |
| 746 | } |
| 747 | } |
| 748 | mutex_unlock(&fsl_edma->fsl_edma_mutex); |
| 749 | return NULL; |
| 750 | } |
| 751 | |
| 752 | static int fsl_edma_alloc_chan_resources(struct dma_chan *chan) |
| 753 | { |
| 754 | struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); |
| 755 | |
| 756 | fsl_chan->tcd_pool = dma_pool_create("tcd_pool", chan->device->dev, |
| 757 | sizeof(struct fsl_edma_hw_tcd), |
| 758 | 32, 0); |
| 759 | return 0; |
| 760 | } |
| 761 | |
| 762 | static void fsl_edma_free_chan_resources(struct dma_chan *chan) |
| 763 | { |
| 764 | struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); |
| 765 | unsigned long flags; |
| 766 | LIST_HEAD(head); |
| 767 | |
| 768 | spin_lock_irqsave(&fsl_chan->vchan.lock, flags); |
| 769 | fsl_edma_disable_request(fsl_chan); |
| 770 | fsl_edma_chan_mux(fsl_chan, 0, false); |
| 771 | fsl_chan->edesc = NULL; |
| 772 | vchan_get_all_descriptors(&fsl_chan->vchan, &head); |
| 773 | spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); |
| 774 | |
| 775 | vchan_dma_desc_free_list(&fsl_chan->vchan, &head); |
| 776 | dma_pool_destroy(fsl_chan->tcd_pool); |
| 777 | fsl_chan->tcd_pool = NULL; |
| 778 | } |
| 779 | |
| 780 | static int fsl_dma_device_slave_caps(struct dma_chan *dchan, |
| 781 | struct dma_slave_caps *caps) |
| 782 | { |
| 783 | caps->src_addr_widths = FSL_EDMA_BUSWIDTHS; |
| 784 | caps->dstn_addr_widths = FSL_EDMA_BUSWIDTHS; |
| 785 | caps->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); |
| 786 | caps->cmd_pause = true; |
| 787 | caps->cmd_terminate = true; |
| 788 | |
| 789 | return 0; |
| 790 | } |
| 791 | |
| 792 | static int |
| 793 | fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma) |
| 794 | { |
| 795 | int ret; |
| 796 | |
| 797 | fsl_edma->txirq = platform_get_irq_byname(pdev, "edma-tx"); |
| 798 | if (fsl_edma->txirq < 0) { |
| 799 | dev_err(&pdev->dev, "Can't get edma-tx irq.\n"); |
| 800 | return fsl_edma->txirq; |
| 801 | } |
| 802 | |
| 803 | fsl_edma->errirq = platform_get_irq_byname(pdev, "edma-err"); |
| 804 | if (fsl_edma->errirq < 0) { |
| 805 | dev_err(&pdev->dev, "Can't get edma-err irq.\n"); |
| 806 | return fsl_edma->errirq; |
| 807 | } |
| 808 | |
| 809 | if (fsl_edma->txirq == fsl_edma->errirq) { |
| 810 | ret = devm_request_irq(&pdev->dev, fsl_edma->txirq, |
| 811 | fsl_edma_irq_handler, 0, "eDMA", fsl_edma); |
| 812 | if (ret) { |
| 813 | dev_err(&pdev->dev, "Can't register eDMA IRQ.\n"); |
| 814 | return ret; |
| 815 | } |
| 816 | } else { |
| 817 | ret = devm_request_irq(&pdev->dev, fsl_edma->txirq, |
| 818 | fsl_edma_tx_handler, 0, "eDMA tx", fsl_edma); |
| 819 | if (ret) { |
| 820 | dev_err(&pdev->dev, "Can't register eDMA tx IRQ.\n"); |
| 821 | return ret; |
| 822 | } |
| 823 | |
| 824 | ret = devm_request_irq(&pdev->dev, fsl_edma->errirq, |
| 825 | fsl_edma_err_handler, 0, "eDMA err", fsl_edma); |
| 826 | if (ret) { |
| 827 | dev_err(&pdev->dev, "Can't register eDMA err IRQ.\n"); |
| 828 | return ret; |
| 829 | } |
| 830 | } |
| 831 | |
| 832 | return 0; |
| 833 | } |
| 834 | |
| 835 | static int fsl_edma_probe(struct platform_device *pdev) |
| 836 | { |
| 837 | struct device_node *np = pdev->dev.of_node; |
| 838 | struct fsl_edma_engine *fsl_edma; |
| 839 | struct fsl_edma_chan *fsl_chan; |
| 840 | struct resource *res; |
| 841 | int len, chans; |
| 842 | int ret, i; |
| 843 | |
| 844 | ret = of_property_read_u32(np, "dma-channels", &chans); |
| 845 | if (ret) { |
| 846 | dev_err(&pdev->dev, "Can't get dma-channels.\n"); |
| 847 | return ret; |
| 848 | } |
| 849 | |
| 850 | len = sizeof(*fsl_edma) + sizeof(*fsl_chan) * chans; |
| 851 | fsl_edma = devm_kzalloc(&pdev->dev, len, GFP_KERNEL); |
| 852 | if (!fsl_edma) |
| 853 | return -ENOMEM; |
| 854 | |
| 855 | fsl_edma->n_chans = chans; |
| 856 | mutex_init(&fsl_edma->fsl_edma_mutex); |
| 857 | |
| 858 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 859 | fsl_edma->membase = devm_ioremap_resource(&pdev->dev, res); |
| 860 | if (IS_ERR(fsl_edma->membase)) |
| 861 | return PTR_ERR(fsl_edma->membase); |
| 862 | |
| 863 | for (i = 0; i < DMAMUX_NR; i++) { |
| 864 | char clkname[32]; |
| 865 | |
| 866 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1 + i); |
| 867 | fsl_edma->muxbase[i] = devm_ioremap_resource(&pdev->dev, res); |
| 868 | if (IS_ERR(fsl_edma->muxbase[i])) |
| 869 | return PTR_ERR(fsl_edma->muxbase[i]); |
| 870 | |
| 871 | sprintf(clkname, "dmamux%d", i); |
| 872 | fsl_edma->muxclk[i] = devm_clk_get(&pdev->dev, clkname); |
| 873 | if (IS_ERR(fsl_edma->muxclk[i])) { |
| 874 | dev_err(&pdev->dev, "Missing DMAMUX block clock.\n"); |
| 875 | return PTR_ERR(fsl_edma->muxclk[i]); |
| 876 | } |
| 877 | |
| 878 | ret = clk_prepare_enable(fsl_edma->muxclk[i]); |
| 879 | if (ret) { |
| 880 | dev_err(&pdev->dev, "DMAMUX clk block failed.\n"); |
| 881 | return ret; |
| 882 | } |
| 883 | |
| 884 | } |
| 885 | |
| 886 | ret = fsl_edma_irq_init(pdev, fsl_edma); |
| 887 | if (ret) |
| 888 | return ret; |
| 889 | |
| 890 | fsl_edma->big_endian = of_property_read_bool(np, "big-endian"); |
| 891 | |
| 892 | INIT_LIST_HEAD(&fsl_edma->dma_dev.channels); |
| 893 | for (i = 0; i < fsl_edma->n_chans; i++) { |
| 894 | struct fsl_edma_chan *fsl_chan = &fsl_edma->chans[i]; |
| 895 | |
| 896 | fsl_chan->edma = fsl_edma; |
| 897 | |
| 898 | fsl_chan->vchan.desc_free = fsl_edma_free_desc; |
| 899 | vchan_init(&fsl_chan->vchan, &fsl_edma->dma_dev); |
| 900 | |
| 901 | edma_writew(fsl_edma, 0x0, fsl_edma->membase + EDMA_TCD_CSR(i)); |
| 902 | fsl_edma_chan_mux(fsl_chan, 0, false); |
| 903 | } |
| 904 | |
| 905 | dma_cap_set(DMA_PRIVATE, fsl_edma->dma_dev.cap_mask); |
| 906 | dma_cap_set(DMA_SLAVE, fsl_edma->dma_dev.cap_mask); |
| 907 | dma_cap_set(DMA_CYCLIC, fsl_edma->dma_dev.cap_mask); |
| 908 | |
| 909 | fsl_edma->dma_dev.dev = &pdev->dev; |
| 910 | fsl_edma->dma_dev.device_alloc_chan_resources |
| 911 | = fsl_edma_alloc_chan_resources; |
| 912 | fsl_edma->dma_dev.device_free_chan_resources |
| 913 | = fsl_edma_free_chan_resources; |
| 914 | fsl_edma->dma_dev.device_tx_status = fsl_edma_tx_status; |
| 915 | fsl_edma->dma_dev.device_prep_slave_sg = fsl_edma_prep_slave_sg; |
| 916 | fsl_edma->dma_dev.device_prep_dma_cyclic = fsl_edma_prep_dma_cyclic; |
| 917 | fsl_edma->dma_dev.device_control = fsl_edma_control; |
| 918 | fsl_edma->dma_dev.device_issue_pending = fsl_edma_issue_pending; |
| 919 | fsl_edma->dma_dev.device_slave_caps = fsl_dma_device_slave_caps; |
| 920 | |
| 921 | platform_set_drvdata(pdev, fsl_edma); |
| 922 | |
| 923 | ret = dma_async_device_register(&fsl_edma->dma_dev); |
| 924 | if (ret) { |
| 925 | dev_err(&pdev->dev, "Can't register Freescale eDMA engine.\n"); |
| 926 | return ret; |
| 927 | } |
| 928 | |
| 929 | ret = of_dma_controller_register(np, fsl_edma_xlate, fsl_edma); |
| 930 | if (ret) { |
| 931 | dev_err(&pdev->dev, "Can't register Freescale eDMA of_dma.\n"); |
| 932 | dma_async_device_unregister(&fsl_edma->dma_dev); |
| 933 | return ret; |
| 934 | } |
| 935 | |
| 936 | /* enable round robin arbitration */ |
| 937 | edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, fsl_edma->membase + EDMA_CR); |
| 938 | |
| 939 | return 0; |
| 940 | } |
| 941 | |
| 942 | static int fsl_edma_remove(struct platform_device *pdev) |
| 943 | { |
| 944 | struct device_node *np = pdev->dev.of_node; |
| 945 | struct fsl_edma_engine *fsl_edma = platform_get_drvdata(pdev); |
| 946 | int i; |
| 947 | |
| 948 | of_dma_controller_free(np); |
| 949 | dma_async_device_unregister(&fsl_edma->dma_dev); |
| 950 | |
| 951 | for (i = 0; i < DMAMUX_NR; i++) |
| 952 | clk_disable_unprepare(fsl_edma->muxclk[i]); |
| 953 | |
| 954 | return 0; |
| 955 | } |
| 956 | |
| 957 | static const struct of_device_id fsl_edma_dt_ids[] = { |
| 958 | { .compatible = "fsl,vf610-edma", }, |
| 959 | { /* sentinel */ } |
| 960 | }; |
| 961 | MODULE_DEVICE_TABLE(of, fsl_edma_dt_ids); |
| 962 | |
| 963 | static struct platform_driver fsl_edma_driver = { |
| 964 | .driver = { |
| 965 | .name = "fsl-edma", |
| 966 | .owner = THIS_MODULE, |
| 967 | .of_match_table = fsl_edma_dt_ids, |
| 968 | }, |
| 969 | .probe = fsl_edma_probe, |
| 970 | .remove = fsl_edma_remove, |
| 971 | }; |
| 972 | |
Yuan Yao | 8edc51c | 2014-04-04 12:27:55 +0800 | [diff] [blame] | 973 | static int __init fsl_edma_init(void) |
| 974 | { |
| 975 | return platform_driver_register(&fsl_edma_driver); |
| 976 | } |
| 977 | subsys_initcall(fsl_edma_init); |
| 978 | |
| 979 | static void __exit fsl_edma_exit(void) |
| 980 | { |
| 981 | platform_driver_unregister(&fsl_edma_driver); |
| 982 | } |
| 983 | module_exit(fsl_edma_exit); |
Jingchang Lu | d6be34f | 2014-02-18 10:17:12 +0800 | [diff] [blame] | 984 | |
| 985 | MODULE_ALIAS("platform:fsl-edma"); |
| 986 | MODULE_DESCRIPTION("Freescale eDMA engine driver"); |
| 987 | MODULE_LICENSE("GPL v2"); |