Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015 Linaro. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | */ |
| 8 | #include <linux/sched.h> |
| 9 | #include <linux/device.h> |
| 10 | #include <linux/dmaengine.h> |
| 11 | #include <linux/dma-mapping.h> |
| 12 | #include <linux/dmapool.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/interrupt.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/platform_device.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/spinlock.h> |
| 20 | #include <linux/of_device.h> |
| 21 | #include <linux/of.h> |
| 22 | #include <linux/clk.h> |
| 23 | #include <linux/of_dma.h> |
| 24 | |
| 25 | #include "virt-dma.h" |
| 26 | |
| 27 | #define DRIVER_NAME "zx-dma" |
| 28 | #define DMA_ALIGN 4 |
| 29 | #define DMA_MAX_SIZE (0x10000 - PAGE_SIZE) |
| 30 | #define LLI_BLOCK_SIZE (4 * PAGE_SIZE) |
| 31 | |
| 32 | #define REG_ZX_SRC_ADDR 0x00 |
| 33 | #define REG_ZX_DST_ADDR 0x04 |
| 34 | #define REG_ZX_TX_X_COUNT 0x08 |
| 35 | #define REG_ZX_TX_ZY_COUNT 0x0c |
| 36 | #define REG_ZX_SRC_ZY_STEP 0x10 |
| 37 | #define REG_ZX_DST_ZY_STEP 0x14 |
| 38 | #define REG_ZX_LLI_ADDR 0x1c |
| 39 | #define REG_ZX_CTRL 0x20 |
| 40 | #define REG_ZX_TC_IRQ 0x800 |
| 41 | #define REG_ZX_SRC_ERR_IRQ 0x804 |
| 42 | #define REG_ZX_DST_ERR_IRQ 0x808 |
| 43 | #define REG_ZX_CFG_ERR_IRQ 0x80c |
| 44 | #define REG_ZX_TC_IRQ_RAW 0x810 |
| 45 | #define REG_ZX_SRC_ERR_IRQ_RAW 0x814 |
| 46 | #define REG_ZX_DST_ERR_IRQ_RAW 0x818 |
| 47 | #define REG_ZX_CFG_ERR_IRQ_RAW 0x81c |
| 48 | #define REG_ZX_STATUS 0x820 |
| 49 | #define REG_ZX_DMA_GRP_PRIO 0x824 |
| 50 | #define REG_ZX_DMA_ARB 0x828 |
| 51 | |
| 52 | #define ZX_FORCE_CLOSE BIT(31) |
| 53 | #define ZX_DST_BURST_WIDTH(x) (((x) & 0x7) << 13) |
| 54 | #define ZX_MAX_BURST_LEN 16 |
| 55 | #define ZX_SRC_BURST_LEN(x) (((x) & 0xf) << 9) |
| 56 | #define ZX_SRC_BURST_WIDTH(x) (((x) & 0x7) << 6) |
| 57 | #define ZX_IRQ_ENABLE_ALL (3 << 4) |
| 58 | #define ZX_DST_FIFO_MODE BIT(3) |
| 59 | #define ZX_SRC_FIFO_MODE BIT(2) |
| 60 | #define ZX_SOFT_REQ BIT(1) |
| 61 | #define ZX_CH_ENABLE BIT(0) |
| 62 | |
| 63 | #define ZX_DMA_BUSWIDTHS \ |
| 64 | (BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \ |
| 65 | BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ |
| 66 | BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ |
| 67 | BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \ |
| 68 | BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)) |
| 69 | |
| 70 | enum zx_dma_burst_width { |
| 71 | ZX_DMA_WIDTH_8BIT = 0, |
| 72 | ZX_DMA_WIDTH_16BIT = 1, |
| 73 | ZX_DMA_WIDTH_32BIT = 2, |
| 74 | ZX_DMA_WIDTH_64BIT = 3, |
| 75 | }; |
| 76 | |
| 77 | struct zx_desc_hw { |
| 78 | u32 saddr; |
| 79 | u32 daddr; |
| 80 | u32 src_x; |
| 81 | u32 src_zy; |
| 82 | u32 src_zy_step; |
| 83 | u32 dst_zy_step; |
| 84 | u32 reserved1; |
| 85 | u32 lli; |
| 86 | u32 ctr; |
| 87 | u32 reserved[7]; /* pack as hardware registers region size */ |
| 88 | } __aligned(32); |
| 89 | |
| 90 | struct zx_dma_desc_sw { |
| 91 | struct virt_dma_desc vd; |
| 92 | dma_addr_t desc_hw_lli; |
| 93 | size_t desc_num; |
| 94 | size_t size; |
| 95 | struct zx_desc_hw *desc_hw; |
| 96 | }; |
| 97 | |
| 98 | struct zx_dma_phy; |
| 99 | |
| 100 | struct zx_dma_chan { |
| 101 | struct dma_slave_config slave_cfg; |
| 102 | int id; /* Request phy chan id */ |
| 103 | u32 ccfg; |
Jun Nie | 2f2560e | 2015-07-21 11:01:06 +0800 | [diff] [blame] | 104 | u32 cyclic; |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 105 | struct virt_dma_chan vc; |
| 106 | struct zx_dma_phy *phy; |
| 107 | struct list_head node; |
| 108 | dma_addr_t dev_addr; |
| 109 | enum dma_status status; |
| 110 | }; |
| 111 | |
| 112 | struct zx_dma_phy { |
| 113 | u32 idx; |
| 114 | void __iomem *base; |
| 115 | struct zx_dma_chan *vchan; |
| 116 | struct zx_dma_desc_sw *ds_run; |
| 117 | struct zx_dma_desc_sw *ds_done; |
| 118 | }; |
| 119 | |
| 120 | struct zx_dma_dev { |
| 121 | struct dma_device slave; |
| 122 | void __iomem *base; |
| 123 | spinlock_t lock; /* lock for ch and phy */ |
| 124 | struct list_head chan_pending; |
| 125 | struct zx_dma_phy *phy; |
| 126 | struct zx_dma_chan *chans; |
| 127 | struct clk *clk; |
| 128 | struct dma_pool *pool; |
| 129 | u32 dma_channels; |
| 130 | u32 dma_requests; |
Vinod Koul | 9bde282 | 2015-05-18 15:33:13 +0530 | [diff] [blame] | 131 | int irq; |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 132 | }; |
| 133 | |
| 134 | #define to_zx_dma(dmadev) container_of(dmadev, struct zx_dma_dev, slave) |
| 135 | |
| 136 | static struct zx_dma_chan *to_zx_chan(struct dma_chan *chan) |
| 137 | { |
| 138 | return container_of(chan, struct zx_dma_chan, vc.chan); |
| 139 | } |
| 140 | |
| 141 | static void zx_dma_terminate_chan(struct zx_dma_phy *phy, struct zx_dma_dev *d) |
| 142 | { |
| 143 | u32 val = 0; |
| 144 | |
| 145 | val = readl_relaxed(phy->base + REG_ZX_CTRL); |
| 146 | val &= ~ZX_CH_ENABLE; |
Jun Nie | ed9c87b | 2015-08-05 13:23:27 +0800 | [diff] [blame] | 147 | val |= ZX_FORCE_CLOSE; |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 148 | writel_relaxed(val, phy->base + REG_ZX_CTRL); |
| 149 | |
| 150 | val = 0x1 << phy->idx; |
| 151 | writel_relaxed(val, d->base + REG_ZX_TC_IRQ_RAW); |
| 152 | writel_relaxed(val, d->base + REG_ZX_SRC_ERR_IRQ_RAW); |
| 153 | writel_relaxed(val, d->base + REG_ZX_DST_ERR_IRQ_RAW); |
| 154 | writel_relaxed(val, d->base + REG_ZX_CFG_ERR_IRQ_RAW); |
| 155 | } |
| 156 | |
| 157 | static void zx_dma_set_desc(struct zx_dma_phy *phy, struct zx_desc_hw *hw) |
| 158 | { |
| 159 | writel_relaxed(hw->saddr, phy->base + REG_ZX_SRC_ADDR); |
| 160 | writel_relaxed(hw->daddr, phy->base + REG_ZX_DST_ADDR); |
| 161 | writel_relaxed(hw->src_x, phy->base + REG_ZX_TX_X_COUNT); |
| 162 | writel_relaxed(0, phy->base + REG_ZX_TX_ZY_COUNT); |
| 163 | writel_relaxed(0, phy->base + REG_ZX_SRC_ZY_STEP); |
| 164 | writel_relaxed(0, phy->base + REG_ZX_DST_ZY_STEP); |
| 165 | writel_relaxed(hw->lli, phy->base + REG_ZX_LLI_ADDR); |
| 166 | writel_relaxed(hw->ctr, phy->base + REG_ZX_CTRL); |
| 167 | } |
| 168 | |
| 169 | static u32 zx_dma_get_curr_lli(struct zx_dma_phy *phy) |
| 170 | { |
| 171 | return readl_relaxed(phy->base + REG_ZX_LLI_ADDR); |
| 172 | } |
| 173 | |
| 174 | static u32 zx_dma_get_chan_stat(struct zx_dma_dev *d) |
| 175 | { |
| 176 | return readl_relaxed(d->base + REG_ZX_STATUS); |
| 177 | } |
| 178 | |
| 179 | static void zx_dma_init_state(struct zx_dma_dev *d) |
| 180 | { |
| 181 | /* set same priority */ |
| 182 | writel_relaxed(0x0, d->base + REG_ZX_DMA_ARB); |
| 183 | /* clear all irq */ |
| 184 | writel_relaxed(0xffffffff, d->base + REG_ZX_TC_IRQ_RAW); |
| 185 | writel_relaxed(0xffffffff, d->base + REG_ZX_SRC_ERR_IRQ_RAW); |
| 186 | writel_relaxed(0xffffffff, d->base + REG_ZX_DST_ERR_IRQ_RAW); |
| 187 | writel_relaxed(0xffffffff, d->base + REG_ZX_CFG_ERR_IRQ_RAW); |
| 188 | } |
| 189 | |
| 190 | static int zx_dma_start_txd(struct zx_dma_chan *c) |
| 191 | { |
| 192 | struct zx_dma_dev *d = to_zx_dma(c->vc.chan.device); |
| 193 | struct virt_dma_desc *vd = vchan_next_desc(&c->vc); |
| 194 | |
| 195 | if (!c->phy) |
| 196 | return -EAGAIN; |
| 197 | |
| 198 | if (BIT(c->phy->idx) & zx_dma_get_chan_stat(d)) |
| 199 | return -EAGAIN; |
| 200 | |
| 201 | if (vd) { |
| 202 | struct zx_dma_desc_sw *ds = |
| 203 | container_of(vd, struct zx_dma_desc_sw, vd); |
| 204 | /* |
| 205 | * fetch and remove request from vc->desc_issued |
| 206 | * so vc->desc_issued only contains desc pending |
| 207 | */ |
| 208 | list_del(&ds->vd.node); |
| 209 | c->phy->ds_run = ds; |
| 210 | c->phy->ds_done = NULL; |
| 211 | /* start dma */ |
| 212 | zx_dma_set_desc(c->phy, ds->desc_hw); |
| 213 | return 0; |
| 214 | } |
| 215 | c->phy->ds_done = NULL; |
| 216 | c->phy->ds_run = NULL; |
| 217 | return -EAGAIN; |
| 218 | } |
| 219 | |
| 220 | static void zx_dma_task(struct zx_dma_dev *d) |
| 221 | { |
| 222 | struct zx_dma_phy *p; |
| 223 | struct zx_dma_chan *c, *cn; |
| 224 | unsigned pch, pch_alloc = 0; |
| 225 | unsigned long flags; |
| 226 | |
| 227 | /* check new dma request of running channel in vc->desc_issued */ |
| 228 | list_for_each_entry_safe(c, cn, &d->slave.channels, |
| 229 | vc.chan.device_node) { |
| 230 | spin_lock_irqsave(&c->vc.lock, flags); |
| 231 | p = c->phy; |
| 232 | if (p && p->ds_done && zx_dma_start_txd(c)) { |
| 233 | /* No current txd associated with this channel */ |
| 234 | dev_dbg(d->slave.dev, "pchan %u: free\n", p->idx); |
| 235 | /* Mark this channel free */ |
| 236 | c->phy = NULL; |
| 237 | p->vchan = NULL; |
| 238 | } |
| 239 | spin_unlock_irqrestore(&c->vc.lock, flags); |
| 240 | } |
| 241 | |
| 242 | /* check new channel request in d->chan_pending */ |
| 243 | spin_lock_irqsave(&d->lock, flags); |
| 244 | while (!list_empty(&d->chan_pending)) { |
| 245 | c = list_first_entry(&d->chan_pending, |
| 246 | struct zx_dma_chan, node); |
| 247 | p = &d->phy[c->id]; |
| 248 | if (!p->vchan) { |
| 249 | /* remove from d->chan_pending */ |
| 250 | list_del_init(&c->node); |
| 251 | pch_alloc |= 1 << c->id; |
| 252 | /* Mark this channel allocated */ |
| 253 | p->vchan = c; |
| 254 | c->phy = p; |
| 255 | } else { |
| 256 | dev_dbg(d->slave.dev, "pchan %u: busy!\n", c->id); |
| 257 | } |
| 258 | } |
| 259 | spin_unlock_irqrestore(&d->lock, flags); |
| 260 | |
| 261 | for (pch = 0; pch < d->dma_channels; pch++) { |
| 262 | if (pch_alloc & (1 << pch)) { |
| 263 | p = &d->phy[pch]; |
| 264 | c = p->vchan; |
| 265 | if (c) { |
| 266 | spin_lock_irqsave(&c->vc.lock, flags); |
| 267 | zx_dma_start_txd(c); |
| 268 | spin_unlock_irqrestore(&c->vc.lock, flags); |
| 269 | } |
| 270 | } |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | static irqreturn_t zx_dma_int_handler(int irq, void *dev_id) |
| 275 | { |
| 276 | struct zx_dma_dev *d = (struct zx_dma_dev *)dev_id; |
| 277 | struct zx_dma_phy *p; |
| 278 | struct zx_dma_chan *c; |
| 279 | u32 tc = readl_relaxed(d->base + REG_ZX_TC_IRQ); |
| 280 | u32 serr = readl_relaxed(d->base + REG_ZX_SRC_ERR_IRQ); |
| 281 | u32 derr = readl_relaxed(d->base + REG_ZX_DST_ERR_IRQ); |
| 282 | u32 cfg = readl_relaxed(d->base + REG_ZX_CFG_ERR_IRQ); |
Jun Nie | 2f2560e | 2015-07-21 11:01:06 +0800 | [diff] [blame] | 283 | u32 i, irq_chan = 0, task = 0; |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 284 | |
| 285 | while (tc) { |
| 286 | i = __ffs(tc); |
| 287 | tc &= ~BIT(i); |
| 288 | p = &d->phy[i]; |
| 289 | c = p->vchan; |
| 290 | if (c) { |
| 291 | unsigned long flags; |
| 292 | |
| 293 | spin_lock_irqsave(&c->vc.lock, flags); |
Jun Nie | 2f2560e | 2015-07-21 11:01:06 +0800 | [diff] [blame] | 294 | if (c->cyclic) { |
| 295 | vchan_cyclic_callback(&p->ds_run->vd); |
| 296 | } else { |
| 297 | vchan_cookie_complete(&p->ds_run->vd); |
| 298 | p->ds_done = p->ds_run; |
| 299 | task = 1; |
| 300 | } |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 301 | spin_unlock_irqrestore(&c->vc.lock, flags); |
Jun Nie | 2f2560e | 2015-07-21 11:01:06 +0800 | [diff] [blame] | 302 | irq_chan |= BIT(i); |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 303 | } |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 304 | } |
| 305 | |
| 306 | if (serr || derr || cfg) |
| 307 | dev_warn(d->slave.dev, "DMA ERR src 0x%x, dst 0x%x, cfg 0x%x\n", |
| 308 | serr, derr, cfg); |
| 309 | |
| 310 | writel_relaxed(irq_chan, d->base + REG_ZX_TC_IRQ_RAW); |
| 311 | writel_relaxed(serr, d->base + REG_ZX_SRC_ERR_IRQ_RAW); |
| 312 | writel_relaxed(derr, d->base + REG_ZX_DST_ERR_IRQ_RAW); |
| 313 | writel_relaxed(cfg, d->base + REG_ZX_CFG_ERR_IRQ_RAW); |
| 314 | |
Jun Nie | 2f2560e | 2015-07-21 11:01:06 +0800 | [diff] [blame] | 315 | if (task) |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 316 | zx_dma_task(d); |
Jun Nie | 2f2560e | 2015-07-21 11:01:06 +0800 | [diff] [blame] | 317 | return IRQ_HANDLED; |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | static void zx_dma_free_chan_resources(struct dma_chan *chan) |
| 321 | { |
| 322 | struct zx_dma_chan *c = to_zx_chan(chan); |
| 323 | struct zx_dma_dev *d = to_zx_dma(chan->device); |
| 324 | unsigned long flags; |
| 325 | |
| 326 | spin_lock_irqsave(&d->lock, flags); |
| 327 | list_del_init(&c->node); |
| 328 | spin_unlock_irqrestore(&d->lock, flags); |
| 329 | |
| 330 | vchan_free_chan_resources(&c->vc); |
| 331 | c->ccfg = 0; |
| 332 | } |
| 333 | |
| 334 | static enum dma_status zx_dma_tx_status(struct dma_chan *chan, |
| 335 | dma_cookie_t cookie, |
| 336 | struct dma_tx_state *state) |
| 337 | { |
| 338 | struct zx_dma_chan *c = to_zx_chan(chan); |
| 339 | struct zx_dma_phy *p; |
| 340 | struct virt_dma_desc *vd; |
| 341 | unsigned long flags; |
| 342 | enum dma_status ret; |
| 343 | size_t bytes = 0; |
| 344 | |
| 345 | ret = dma_cookie_status(&c->vc.chan, cookie, state); |
| 346 | if (ret == DMA_COMPLETE || !state) |
| 347 | return ret; |
| 348 | |
| 349 | spin_lock_irqsave(&c->vc.lock, flags); |
| 350 | p = c->phy; |
| 351 | ret = c->status; |
| 352 | |
| 353 | /* |
| 354 | * If the cookie is on our issue queue, then the residue is |
| 355 | * its total size. |
| 356 | */ |
| 357 | vd = vchan_find_desc(&c->vc, cookie); |
| 358 | if (vd) { |
| 359 | bytes = container_of(vd, struct zx_dma_desc_sw, vd)->size; |
| 360 | } else if ((!p) || (!p->ds_run)) { |
| 361 | bytes = 0; |
| 362 | } else { |
| 363 | struct zx_dma_desc_sw *ds = p->ds_run; |
| 364 | u32 clli = 0, index = 0; |
| 365 | |
| 366 | bytes = 0; |
| 367 | clli = zx_dma_get_curr_lli(p); |
| 368 | index = (clli - ds->desc_hw_lli) / sizeof(struct zx_desc_hw); |
| 369 | for (; index < ds->desc_num; index++) { |
| 370 | bytes += ds->desc_hw[index].src_x; |
| 371 | /* end of lli */ |
| 372 | if (!ds->desc_hw[index].lli) |
| 373 | break; |
| 374 | } |
| 375 | } |
| 376 | spin_unlock_irqrestore(&c->vc.lock, flags); |
| 377 | dma_set_residue(state, bytes); |
| 378 | return ret; |
| 379 | } |
| 380 | |
| 381 | static void zx_dma_issue_pending(struct dma_chan *chan) |
| 382 | { |
| 383 | struct zx_dma_chan *c = to_zx_chan(chan); |
| 384 | struct zx_dma_dev *d = to_zx_dma(chan->device); |
| 385 | unsigned long flags; |
| 386 | int issue = 0; |
| 387 | |
| 388 | spin_lock_irqsave(&c->vc.lock, flags); |
| 389 | /* add request to vc->desc_issued */ |
| 390 | if (vchan_issue_pending(&c->vc)) { |
| 391 | spin_lock(&d->lock); |
| 392 | if (!c->phy && list_empty(&c->node)) { |
| 393 | /* if new channel, add chan_pending */ |
| 394 | list_add_tail(&c->node, &d->chan_pending); |
| 395 | issue = 1; |
| 396 | dev_dbg(d->slave.dev, "vchan %p: issued\n", &c->vc); |
| 397 | } |
| 398 | spin_unlock(&d->lock); |
| 399 | } else { |
| 400 | dev_dbg(d->slave.dev, "vchan %p: nothing to issue\n", &c->vc); |
| 401 | } |
| 402 | spin_unlock_irqrestore(&c->vc.lock, flags); |
| 403 | |
| 404 | if (issue) |
| 405 | zx_dma_task(d); |
| 406 | } |
| 407 | |
| 408 | static void zx_dma_fill_desc(struct zx_dma_desc_sw *ds, dma_addr_t dst, |
| 409 | dma_addr_t src, size_t len, u32 num, u32 ccfg) |
| 410 | { |
| 411 | if ((num + 1) < ds->desc_num) |
| 412 | ds->desc_hw[num].lli = ds->desc_hw_lli + (num + 1) * |
| 413 | sizeof(struct zx_desc_hw); |
| 414 | ds->desc_hw[num].saddr = src; |
| 415 | ds->desc_hw[num].daddr = dst; |
| 416 | ds->desc_hw[num].src_x = len; |
| 417 | ds->desc_hw[num].ctr = ccfg; |
| 418 | } |
| 419 | |
| 420 | static struct zx_dma_desc_sw *zx_alloc_desc_resource(int num, |
| 421 | struct dma_chan *chan) |
| 422 | { |
| 423 | struct zx_dma_chan *c = to_zx_chan(chan); |
| 424 | struct zx_dma_desc_sw *ds; |
| 425 | struct zx_dma_dev *d = to_zx_dma(chan->device); |
| 426 | int lli_limit = LLI_BLOCK_SIZE / sizeof(struct zx_desc_hw); |
| 427 | |
| 428 | if (num > lli_limit) { |
| 429 | dev_dbg(chan->device->dev, "vch %p: sg num %d exceed max %d\n", |
| 430 | &c->vc, num, lli_limit); |
| 431 | return NULL; |
| 432 | } |
| 433 | |
| 434 | ds = kzalloc(sizeof(*ds), GFP_ATOMIC); |
| 435 | if (!ds) |
| 436 | return NULL; |
| 437 | |
Souptick Joarder | c2e60fc | 2016-11-30 02:28:58 +0530 | [diff] [blame] | 438 | ds->desc_hw = dma_pool_zalloc(d->pool, GFP_NOWAIT, &ds->desc_hw_lli); |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 439 | if (!ds->desc_hw) { |
| 440 | dev_dbg(chan->device->dev, "vch %p: dma alloc fail\n", &c->vc); |
| 441 | kfree(ds); |
| 442 | return NULL; |
| 443 | } |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 444 | ds->desc_num = num; |
| 445 | return ds; |
| 446 | } |
| 447 | |
| 448 | static enum zx_dma_burst_width zx_dma_burst_width(enum dma_slave_buswidth width) |
| 449 | { |
| 450 | switch (width) { |
| 451 | case DMA_SLAVE_BUSWIDTH_1_BYTE: |
| 452 | case DMA_SLAVE_BUSWIDTH_2_BYTES: |
| 453 | case DMA_SLAVE_BUSWIDTH_4_BYTES: |
| 454 | case DMA_SLAVE_BUSWIDTH_8_BYTES: |
| 455 | return ffs(width) - 1; |
| 456 | default: |
| 457 | return ZX_DMA_WIDTH_32BIT; |
| 458 | } |
| 459 | } |
| 460 | |
| 461 | static int zx_pre_config(struct zx_dma_chan *c, enum dma_transfer_direction dir) |
| 462 | { |
| 463 | struct dma_slave_config *cfg = &c->slave_cfg; |
| 464 | enum zx_dma_burst_width src_width; |
| 465 | enum zx_dma_burst_width dst_width; |
| 466 | u32 maxburst = 0; |
| 467 | |
| 468 | switch (dir) { |
| 469 | case DMA_MEM_TO_MEM: |
| 470 | c->ccfg = ZX_CH_ENABLE | ZX_SOFT_REQ |
| 471 | | ZX_SRC_BURST_LEN(ZX_MAX_BURST_LEN - 1) |
| 472 | | ZX_SRC_BURST_WIDTH(ZX_DMA_WIDTH_32BIT) |
| 473 | | ZX_DST_BURST_WIDTH(ZX_DMA_WIDTH_32BIT); |
| 474 | break; |
| 475 | case DMA_MEM_TO_DEV: |
| 476 | c->dev_addr = cfg->dst_addr; |
| 477 | /* dst len is calculated from src width, len and dst width. |
| 478 | * We need make sure dst len not exceed MAX LEN. |
Jun Nie | 2092539 | 2015-08-05 13:23:26 +0800 | [diff] [blame] | 479 | * Trailing single transaction that does not fill a full |
| 480 | * burst also require identical src/dst data width. |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 481 | */ |
| 482 | dst_width = zx_dma_burst_width(cfg->dst_addr_width); |
Jun Nie | 2092539 | 2015-08-05 13:23:26 +0800 | [diff] [blame] | 483 | maxburst = cfg->dst_maxburst; |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 484 | maxburst = maxburst < ZX_MAX_BURST_LEN ? |
| 485 | maxburst : ZX_MAX_BURST_LEN; |
| 486 | c->ccfg = ZX_DST_FIFO_MODE | ZX_CH_ENABLE |
| 487 | | ZX_SRC_BURST_LEN(maxburst - 1) |
Jun Nie | 2092539 | 2015-08-05 13:23:26 +0800 | [diff] [blame] | 488 | | ZX_SRC_BURST_WIDTH(dst_width) |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 489 | | ZX_DST_BURST_WIDTH(dst_width); |
| 490 | break; |
| 491 | case DMA_DEV_TO_MEM: |
| 492 | c->dev_addr = cfg->src_addr; |
| 493 | src_width = zx_dma_burst_width(cfg->src_addr_width); |
| 494 | maxburst = cfg->src_maxburst; |
| 495 | maxburst = maxburst < ZX_MAX_BURST_LEN ? |
| 496 | maxburst : ZX_MAX_BURST_LEN; |
| 497 | c->ccfg = ZX_SRC_FIFO_MODE | ZX_CH_ENABLE |
| 498 | | ZX_SRC_BURST_LEN(maxburst - 1) |
| 499 | | ZX_SRC_BURST_WIDTH(src_width) |
Jun Nie | 2092539 | 2015-08-05 13:23:26 +0800 | [diff] [blame] | 500 | | ZX_DST_BURST_WIDTH(src_width); |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 501 | break; |
| 502 | default: |
| 503 | return -EINVAL; |
| 504 | } |
| 505 | return 0; |
| 506 | } |
| 507 | |
| 508 | static struct dma_async_tx_descriptor *zx_dma_prep_memcpy( |
| 509 | struct dma_chan *chan, dma_addr_t dst, dma_addr_t src, |
| 510 | size_t len, unsigned long flags) |
| 511 | { |
| 512 | struct zx_dma_chan *c = to_zx_chan(chan); |
| 513 | struct zx_dma_desc_sw *ds; |
| 514 | size_t copy = 0; |
| 515 | int num = 0; |
| 516 | |
| 517 | if (!len) |
| 518 | return NULL; |
| 519 | |
| 520 | if (zx_pre_config(c, DMA_MEM_TO_MEM)) |
| 521 | return NULL; |
| 522 | |
| 523 | num = DIV_ROUND_UP(len, DMA_MAX_SIZE); |
| 524 | |
| 525 | ds = zx_alloc_desc_resource(num, chan); |
| 526 | if (!ds) |
| 527 | return NULL; |
| 528 | |
| 529 | ds->size = len; |
| 530 | num = 0; |
| 531 | |
| 532 | do { |
| 533 | copy = min_t(size_t, len, DMA_MAX_SIZE); |
| 534 | zx_dma_fill_desc(ds, dst, src, copy, num++, c->ccfg); |
| 535 | |
| 536 | src += copy; |
| 537 | dst += copy; |
| 538 | len -= copy; |
| 539 | } while (len); |
| 540 | |
Jun Nie | 2f2560e | 2015-07-21 11:01:06 +0800 | [diff] [blame] | 541 | c->cyclic = 0; |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 542 | ds->desc_hw[num - 1].lli = 0; /* end of link */ |
| 543 | ds->desc_hw[num - 1].ctr |= ZX_IRQ_ENABLE_ALL; |
| 544 | return vchan_tx_prep(&c->vc, &ds->vd, flags); |
| 545 | } |
| 546 | |
| 547 | static struct dma_async_tx_descriptor *zx_dma_prep_slave_sg( |
| 548 | struct dma_chan *chan, struct scatterlist *sgl, unsigned int sglen, |
| 549 | enum dma_transfer_direction dir, unsigned long flags, void *context) |
| 550 | { |
| 551 | struct zx_dma_chan *c = to_zx_chan(chan); |
| 552 | struct zx_dma_desc_sw *ds; |
| 553 | size_t len, avail, total = 0; |
| 554 | struct scatterlist *sg; |
| 555 | dma_addr_t addr, src = 0, dst = 0; |
| 556 | int num = sglen, i; |
| 557 | |
| 558 | if (!sgl) |
| 559 | return NULL; |
| 560 | |
| 561 | if (zx_pre_config(c, dir)) |
| 562 | return NULL; |
| 563 | |
| 564 | for_each_sg(sgl, sg, sglen, i) { |
| 565 | avail = sg_dma_len(sg); |
| 566 | if (avail > DMA_MAX_SIZE) |
| 567 | num += DIV_ROUND_UP(avail, DMA_MAX_SIZE) - 1; |
| 568 | } |
| 569 | |
| 570 | ds = zx_alloc_desc_resource(num, chan); |
| 571 | if (!ds) |
| 572 | return NULL; |
| 573 | |
Jun Nie | 2f2560e | 2015-07-21 11:01:06 +0800 | [diff] [blame] | 574 | c->cyclic = 0; |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 575 | num = 0; |
| 576 | for_each_sg(sgl, sg, sglen, i) { |
| 577 | addr = sg_dma_address(sg); |
| 578 | avail = sg_dma_len(sg); |
| 579 | total += avail; |
| 580 | |
| 581 | do { |
| 582 | len = min_t(size_t, avail, DMA_MAX_SIZE); |
| 583 | |
| 584 | if (dir == DMA_MEM_TO_DEV) { |
| 585 | src = addr; |
| 586 | dst = c->dev_addr; |
| 587 | } else if (dir == DMA_DEV_TO_MEM) { |
| 588 | src = c->dev_addr; |
| 589 | dst = addr; |
| 590 | } |
| 591 | |
| 592 | zx_dma_fill_desc(ds, dst, src, len, num++, c->ccfg); |
| 593 | |
| 594 | addr += len; |
| 595 | avail -= len; |
| 596 | } while (avail); |
| 597 | } |
| 598 | |
| 599 | ds->desc_hw[num - 1].lli = 0; /* end of link */ |
| 600 | ds->desc_hw[num - 1].ctr |= ZX_IRQ_ENABLE_ALL; |
| 601 | ds->size = total; |
| 602 | return vchan_tx_prep(&c->vc, &ds->vd, flags); |
| 603 | } |
| 604 | |
Jun Nie | 2f2560e | 2015-07-21 11:01:06 +0800 | [diff] [blame] | 605 | static struct dma_async_tx_descriptor *zx_dma_prep_dma_cyclic( |
| 606 | struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, |
| 607 | size_t period_len, enum dma_transfer_direction dir, |
| 608 | unsigned long flags) |
| 609 | { |
| 610 | struct zx_dma_chan *c = to_zx_chan(chan); |
| 611 | struct zx_dma_desc_sw *ds; |
| 612 | dma_addr_t src = 0, dst = 0; |
| 613 | int num_periods = buf_len / period_len; |
| 614 | int buf = 0, num = 0; |
| 615 | |
| 616 | if (period_len > DMA_MAX_SIZE) { |
| 617 | dev_err(chan->device->dev, "maximum period size exceeded\n"); |
| 618 | return NULL; |
| 619 | } |
| 620 | |
| 621 | if (zx_pre_config(c, dir)) |
| 622 | return NULL; |
| 623 | |
| 624 | ds = zx_alloc_desc_resource(num_periods, chan); |
| 625 | if (!ds) |
| 626 | return NULL; |
| 627 | c->cyclic = 1; |
| 628 | |
| 629 | while (buf < buf_len) { |
| 630 | if (dir == DMA_MEM_TO_DEV) { |
| 631 | src = dma_addr; |
| 632 | dst = c->dev_addr; |
| 633 | } else if (dir == DMA_DEV_TO_MEM) { |
| 634 | src = c->dev_addr; |
| 635 | dst = dma_addr; |
| 636 | } |
| 637 | zx_dma_fill_desc(ds, dst, src, period_len, num++, |
| 638 | c->ccfg | ZX_IRQ_ENABLE_ALL); |
| 639 | dma_addr += period_len; |
| 640 | buf += period_len; |
| 641 | } |
| 642 | |
| 643 | ds->desc_hw[num - 1].lli = ds->desc_hw_lli; |
| 644 | ds->size = buf_len; |
| 645 | return vchan_tx_prep(&c->vc, &ds->vd, flags); |
| 646 | } |
| 647 | |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 648 | static int zx_dma_config(struct dma_chan *chan, |
| 649 | struct dma_slave_config *cfg) |
| 650 | { |
| 651 | struct zx_dma_chan *c = to_zx_chan(chan); |
| 652 | |
| 653 | if (!cfg) |
| 654 | return -EINVAL; |
| 655 | |
| 656 | memcpy(&c->slave_cfg, cfg, sizeof(*cfg)); |
| 657 | |
| 658 | return 0; |
| 659 | } |
| 660 | |
| 661 | static int zx_dma_terminate_all(struct dma_chan *chan) |
| 662 | { |
| 663 | struct zx_dma_chan *c = to_zx_chan(chan); |
| 664 | struct zx_dma_dev *d = to_zx_dma(chan->device); |
| 665 | struct zx_dma_phy *p = c->phy; |
| 666 | unsigned long flags; |
| 667 | LIST_HEAD(head); |
| 668 | |
| 669 | dev_dbg(d->slave.dev, "vchan %p: terminate all\n", &c->vc); |
| 670 | |
| 671 | /* Prevent this channel being scheduled */ |
| 672 | spin_lock(&d->lock); |
| 673 | list_del_init(&c->node); |
| 674 | spin_unlock(&d->lock); |
| 675 | |
| 676 | /* Clear the tx descriptor lists */ |
| 677 | spin_lock_irqsave(&c->vc.lock, flags); |
| 678 | vchan_get_all_descriptors(&c->vc, &head); |
| 679 | if (p) { |
| 680 | /* vchan is assigned to a pchan - stop the channel */ |
| 681 | zx_dma_terminate_chan(p, d); |
| 682 | c->phy = NULL; |
| 683 | p->vchan = NULL; |
| 684 | p->ds_run = NULL; |
| 685 | p->ds_done = NULL; |
| 686 | } |
| 687 | spin_unlock_irqrestore(&c->vc.lock, flags); |
| 688 | vchan_dma_desc_free_list(&c->vc, &head); |
| 689 | |
| 690 | return 0; |
| 691 | } |
| 692 | |
Jun Nie | 2f2560e | 2015-07-21 11:01:06 +0800 | [diff] [blame] | 693 | static int zx_dma_transfer_pause(struct dma_chan *chan) |
| 694 | { |
| 695 | struct zx_dma_chan *c = to_zx_chan(chan); |
| 696 | u32 val = 0; |
| 697 | |
| 698 | val = readl_relaxed(c->phy->base + REG_ZX_CTRL); |
| 699 | val &= ~ZX_CH_ENABLE; |
| 700 | writel_relaxed(val, c->phy->base + REG_ZX_CTRL); |
| 701 | |
| 702 | return 0; |
| 703 | } |
| 704 | |
| 705 | static int zx_dma_transfer_resume(struct dma_chan *chan) |
| 706 | { |
| 707 | struct zx_dma_chan *c = to_zx_chan(chan); |
| 708 | u32 val = 0; |
| 709 | |
| 710 | val = readl_relaxed(c->phy->base + REG_ZX_CTRL); |
| 711 | val |= ZX_CH_ENABLE; |
| 712 | writel_relaxed(val, c->phy->base + REG_ZX_CTRL); |
| 713 | |
| 714 | return 0; |
| 715 | } |
| 716 | |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 717 | static void zx_dma_free_desc(struct virt_dma_desc *vd) |
| 718 | { |
| 719 | struct zx_dma_desc_sw *ds = |
| 720 | container_of(vd, struct zx_dma_desc_sw, vd); |
| 721 | struct zx_dma_dev *d = to_zx_dma(vd->tx.chan->device); |
| 722 | |
| 723 | dma_pool_free(d->pool, ds->desc_hw, ds->desc_hw_lli); |
| 724 | kfree(ds); |
| 725 | } |
| 726 | |
| 727 | static const struct of_device_id zx6702_dma_dt_ids[] = { |
| 728 | { .compatible = "zte,zx296702-dma", }, |
| 729 | {} |
| 730 | }; |
| 731 | MODULE_DEVICE_TABLE(of, zx6702_dma_dt_ids); |
| 732 | |
| 733 | static struct dma_chan *zx_of_dma_simple_xlate(struct of_phandle_args *dma_spec, |
| 734 | struct of_dma *ofdma) |
| 735 | { |
| 736 | struct zx_dma_dev *d = ofdma->of_dma_data; |
| 737 | unsigned int request = dma_spec->args[0]; |
| 738 | struct dma_chan *chan; |
| 739 | struct zx_dma_chan *c; |
| 740 | |
Axel Lin | aa3ee5f | 2015-09-26 17:15:47 +0800 | [diff] [blame] | 741 | if (request >= d->dma_requests) |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 742 | return NULL; |
| 743 | |
| 744 | chan = dma_get_any_slave_channel(&d->slave); |
| 745 | if (!chan) { |
| 746 | dev_err(d->slave.dev, "get channel fail in %s.\n", __func__); |
| 747 | return NULL; |
| 748 | } |
| 749 | c = to_zx_chan(chan); |
| 750 | c->id = request; |
| 751 | dev_info(d->slave.dev, "zx_dma: pchan %u: alloc vchan %p\n", |
| 752 | c->id, &c->vc); |
| 753 | return chan; |
| 754 | } |
| 755 | |
| 756 | static int zx_dma_probe(struct platform_device *op) |
| 757 | { |
| 758 | struct zx_dma_dev *d; |
| 759 | struct resource *iores; |
Vinod Koul | 9bde282 | 2015-05-18 15:33:13 +0530 | [diff] [blame] | 760 | int i, ret = 0; |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 761 | |
| 762 | iores = platform_get_resource(op, IORESOURCE_MEM, 0); |
| 763 | if (!iores) |
| 764 | return -EINVAL; |
| 765 | |
| 766 | d = devm_kzalloc(&op->dev, sizeof(*d), GFP_KERNEL); |
| 767 | if (!d) |
| 768 | return -ENOMEM; |
| 769 | |
| 770 | d->base = devm_ioremap_resource(&op->dev, iores); |
| 771 | if (IS_ERR(d->base)) |
| 772 | return PTR_ERR(d->base); |
| 773 | |
| 774 | of_property_read_u32((&op->dev)->of_node, |
| 775 | "dma-channels", &d->dma_channels); |
| 776 | of_property_read_u32((&op->dev)->of_node, |
| 777 | "dma-requests", &d->dma_requests); |
| 778 | if (!d->dma_requests || !d->dma_channels) |
| 779 | return -EINVAL; |
| 780 | |
| 781 | d->clk = devm_clk_get(&op->dev, NULL); |
| 782 | if (IS_ERR(d->clk)) { |
| 783 | dev_err(&op->dev, "no dma clk\n"); |
| 784 | return PTR_ERR(d->clk); |
| 785 | } |
| 786 | |
Vinod Koul | 9bde282 | 2015-05-18 15:33:13 +0530 | [diff] [blame] | 787 | d->irq = platform_get_irq(op, 0); |
| 788 | ret = devm_request_irq(&op->dev, d->irq, zx_dma_int_handler, |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 789 | 0, DRIVER_NAME, d); |
| 790 | if (ret) |
| 791 | return ret; |
| 792 | |
| 793 | /* A DMA memory pool for LLIs, align on 32-byte boundary */ |
| 794 | d->pool = dmam_pool_create(DRIVER_NAME, &op->dev, |
| 795 | LLI_BLOCK_SIZE, 32, 0); |
| 796 | if (!d->pool) |
| 797 | return -ENOMEM; |
| 798 | |
| 799 | /* init phy channel */ |
| 800 | d->phy = devm_kzalloc(&op->dev, |
| 801 | d->dma_channels * sizeof(struct zx_dma_phy), GFP_KERNEL); |
| 802 | if (!d->phy) |
| 803 | return -ENOMEM; |
| 804 | |
| 805 | for (i = 0; i < d->dma_channels; i++) { |
| 806 | struct zx_dma_phy *p = &d->phy[i]; |
| 807 | |
| 808 | p->idx = i; |
| 809 | p->base = d->base + i * 0x40; |
| 810 | } |
| 811 | |
| 812 | INIT_LIST_HEAD(&d->slave.channels); |
| 813 | dma_cap_set(DMA_SLAVE, d->slave.cap_mask); |
| 814 | dma_cap_set(DMA_MEMCPY, d->slave.cap_mask); |
| 815 | dma_cap_set(DMA_PRIVATE, d->slave.cap_mask); |
| 816 | d->slave.dev = &op->dev; |
| 817 | d->slave.device_free_chan_resources = zx_dma_free_chan_resources; |
| 818 | d->slave.device_tx_status = zx_dma_tx_status; |
| 819 | d->slave.device_prep_dma_memcpy = zx_dma_prep_memcpy; |
| 820 | d->slave.device_prep_slave_sg = zx_dma_prep_slave_sg; |
Jun Nie | 2f2560e | 2015-07-21 11:01:06 +0800 | [diff] [blame] | 821 | d->slave.device_prep_dma_cyclic = zx_dma_prep_dma_cyclic; |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 822 | d->slave.device_issue_pending = zx_dma_issue_pending; |
| 823 | d->slave.device_config = zx_dma_config; |
| 824 | d->slave.device_terminate_all = zx_dma_terminate_all; |
Jun Nie | 2f2560e | 2015-07-21 11:01:06 +0800 | [diff] [blame] | 825 | d->slave.device_pause = zx_dma_transfer_pause; |
| 826 | d->slave.device_resume = zx_dma_transfer_resume; |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 827 | d->slave.copy_align = DMA_ALIGN; |
| 828 | d->slave.src_addr_widths = ZX_DMA_BUSWIDTHS; |
| 829 | d->slave.dst_addr_widths = ZX_DMA_BUSWIDTHS; |
| 830 | d->slave.directions = BIT(DMA_MEM_TO_MEM) | BIT(DMA_MEM_TO_DEV) |
| 831 | | BIT(DMA_DEV_TO_MEM); |
| 832 | d->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT; |
| 833 | |
| 834 | /* init virtual channel */ |
| 835 | d->chans = devm_kzalloc(&op->dev, |
| 836 | d->dma_requests * sizeof(struct zx_dma_chan), GFP_KERNEL); |
| 837 | if (!d->chans) |
| 838 | return -ENOMEM; |
| 839 | |
| 840 | for (i = 0; i < d->dma_requests; i++) { |
| 841 | struct zx_dma_chan *c = &d->chans[i]; |
| 842 | |
| 843 | c->status = DMA_IN_PROGRESS; |
| 844 | INIT_LIST_HEAD(&c->node); |
| 845 | c->vc.desc_free = zx_dma_free_desc; |
| 846 | vchan_init(&c->vc, &d->slave); |
| 847 | } |
| 848 | |
| 849 | /* Enable clock before accessing registers */ |
| 850 | ret = clk_prepare_enable(d->clk); |
| 851 | if (ret < 0) { |
| 852 | dev_err(&op->dev, "clk_prepare_enable failed: %d\n", ret); |
| 853 | goto zx_dma_out; |
| 854 | } |
| 855 | |
| 856 | zx_dma_init_state(d); |
| 857 | |
| 858 | spin_lock_init(&d->lock); |
| 859 | INIT_LIST_HEAD(&d->chan_pending); |
| 860 | platform_set_drvdata(op, d); |
| 861 | |
| 862 | ret = dma_async_device_register(&d->slave); |
| 863 | if (ret) |
| 864 | goto clk_dis; |
| 865 | |
| 866 | ret = of_dma_controller_register((&op->dev)->of_node, |
| 867 | zx_of_dma_simple_xlate, d); |
| 868 | if (ret) |
| 869 | goto of_dma_register_fail; |
| 870 | |
| 871 | dev_info(&op->dev, "initialized\n"); |
| 872 | return 0; |
| 873 | |
| 874 | of_dma_register_fail: |
| 875 | dma_async_device_unregister(&d->slave); |
| 876 | clk_dis: |
| 877 | clk_disable_unprepare(d->clk); |
| 878 | zx_dma_out: |
| 879 | return ret; |
| 880 | } |
| 881 | |
| 882 | static int zx_dma_remove(struct platform_device *op) |
| 883 | { |
| 884 | struct zx_dma_chan *c, *cn; |
| 885 | struct zx_dma_dev *d = platform_get_drvdata(op); |
| 886 | |
Vinod Koul | 9bde282 | 2015-05-18 15:33:13 +0530 | [diff] [blame] | 887 | /* explictly free the irq */ |
| 888 | devm_free_irq(&op->dev, d->irq, d); |
| 889 | |
Jun Nie | e3fa984 | 2015-05-05 22:06:08 +0800 | [diff] [blame] | 890 | dma_async_device_unregister(&d->slave); |
| 891 | of_dma_controller_free((&op->dev)->of_node); |
| 892 | |
| 893 | list_for_each_entry_safe(c, cn, &d->slave.channels, |
| 894 | vc.chan.device_node) { |
| 895 | list_del(&c->vc.chan.device_node); |
| 896 | } |
| 897 | clk_disable_unprepare(d->clk); |
| 898 | dmam_pool_destroy(d->pool); |
| 899 | |
| 900 | return 0; |
| 901 | } |
| 902 | |
| 903 | #ifdef CONFIG_PM_SLEEP |
| 904 | static int zx_dma_suspend_dev(struct device *dev) |
| 905 | { |
| 906 | struct zx_dma_dev *d = dev_get_drvdata(dev); |
| 907 | u32 stat = 0; |
| 908 | |
| 909 | stat = zx_dma_get_chan_stat(d); |
| 910 | if (stat) { |
| 911 | dev_warn(d->slave.dev, |
| 912 | "chan %d is running fail to suspend\n", stat); |
| 913 | return -1; |
| 914 | } |
| 915 | clk_disable_unprepare(d->clk); |
| 916 | return 0; |
| 917 | } |
| 918 | |
| 919 | static int zx_dma_resume_dev(struct device *dev) |
| 920 | { |
| 921 | struct zx_dma_dev *d = dev_get_drvdata(dev); |
| 922 | int ret = 0; |
| 923 | |
| 924 | ret = clk_prepare_enable(d->clk); |
| 925 | if (ret < 0) { |
| 926 | dev_err(d->slave.dev, "clk_prepare_enable failed: %d\n", ret); |
| 927 | return ret; |
| 928 | } |
| 929 | zx_dma_init_state(d); |
| 930 | return 0; |
| 931 | } |
| 932 | #endif |
| 933 | |
| 934 | static SIMPLE_DEV_PM_OPS(zx_dma_pmops, zx_dma_suspend_dev, zx_dma_resume_dev); |
| 935 | |
| 936 | static struct platform_driver zx_pdma_driver = { |
| 937 | .driver = { |
| 938 | .name = DRIVER_NAME, |
| 939 | .pm = &zx_dma_pmops, |
| 940 | .of_match_table = zx6702_dma_dt_ids, |
| 941 | }, |
| 942 | .probe = zx_dma_probe, |
| 943 | .remove = zx_dma_remove, |
| 944 | }; |
| 945 | |
| 946 | module_platform_driver(zx_pdma_driver); |
| 947 | |
| 948 | MODULE_DESCRIPTION("ZTE ZX296702 DMA Driver"); |
| 949 | MODULE_AUTHOR("Jun Nie jun.nie@linaro.org"); |
| 950 | MODULE_LICENSE("GPL v2"); |