Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Driver for the Synopsys DesignWare DMA Controller (aka DMACA on |
| 3 | * AVR32 systems.) |
| 4 | * |
| 5 | * Copyright (C) 2007-2008 Atmel Corporation |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | #include <linux/clk.h> |
| 12 | #include <linux/delay.h> |
| 13 | #include <linux/dmaengine.h> |
| 14 | #include <linux/dma-mapping.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/interrupt.h> |
| 17 | #include <linux/io.h> |
| 18 | #include <linux/mm.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/platform_device.h> |
| 21 | #include <linux/slab.h> |
| 22 | |
| 23 | #include "dw_dmac_regs.h" |
| 24 | |
| 25 | /* |
| 26 | * This supports the Synopsys "DesignWare AHB Central DMA Controller", |
| 27 | * (DW_ahb_dmac) which is used with various AMBA 2.0 systems (not all |
| 28 | * of which use ARM any more). See the "Databook" from Synopsys for |
| 29 | * information beyond what licensees probably provide. |
| 30 | * |
| 31 | * The driver has currently been tested only with the Atmel AT32AP7000, |
| 32 | * which does not support descriptor writeback. |
| 33 | */ |
| 34 | |
Jamie Iles | f301c06 | 2011-01-21 14:11:53 +0000 | [diff] [blame] | 35 | #define DWC_DEFAULT_CTLLO(private) ({ \ |
| 36 | struct dw_dma_slave *__slave = (private); \ |
| 37 | int dms = __slave ? __slave->dst_master : 0; \ |
| 38 | int sms = __slave ? __slave->src_master : 1; \ |
| 39 | \ |
| 40 | (DWC_CTLL_DST_MSIZE(0) \ |
| 41 | | DWC_CTLL_SRC_MSIZE(0) \ |
| 42 | | DWC_CTLL_LLP_D_EN \ |
| 43 | | DWC_CTLL_LLP_S_EN \ |
| 44 | | DWC_CTLL_DMS(dms) \ |
| 45 | | DWC_CTLL_SMS(sms)); \ |
| 46 | }) |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 47 | |
| 48 | /* |
| 49 | * This is configuration-dependent and usually a funny size like 4095. |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 50 | * |
| 51 | * Note that this is a transfer count, i.e. if we transfer 32-bit |
Viresh Kumar | 418e740 | 2011-03-04 15:42:50 +0530 | [diff] [blame^] | 52 | * words, we can do 16380 bytes per descriptor. |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 53 | * |
| 54 | * This parameter is also system-specific. |
| 55 | */ |
Viresh Kumar | 418e740 | 2011-03-04 15:42:50 +0530 | [diff] [blame^] | 56 | #define DWC_MAX_COUNT 4095U |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 57 | |
| 58 | /* |
| 59 | * Number of descriptors to allocate for each channel. This should be |
| 60 | * made configurable somehow; preferably, the clients (at least the |
| 61 | * ones using slave transfers) should be able to give us a hint. |
| 62 | */ |
| 63 | #define NR_DESCS_PER_CHANNEL 64 |
| 64 | |
| 65 | /*----------------------------------------------------------------------*/ |
| 66 | |
| 67 | /* |
| 68 | * Because we're not relying on writeback from the controller (it may not |
| 69 | * even be configured into the core!) we don't need to use dma_pool. These |
| 70 | * descriptors -- and associated data -- are cacheable. We do need to make |
| 71 | * sure their dcache entries are written back before handing them off to |
| 72 | * the controller, though. |
| 73 | */ |
| 74 | |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 75 | static struct device *chan2dev(struct dma_chan *chan) |
| 76 | { |
| 77 | return &chan->dev->device; |
| 78 | } |
| 79 | static struct device *chan2parent(struct dma_chan *chan) |
| 80 | { |
| 81 | return chan->dev->device.parent; |
| 82 | } |
| 83 | |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 84 | static struct dw_desc *dwc_first_active(struct dw_dma_chan *dwc) |
| 85 | { |
| 86 | return list_entry(dwc->active_list.next, struct dw_desc, desc_node); |
| 87 | } |
| 88 | |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 89 | static struct dw_desc *dwc_desc_get(struct dw_dma_chan *dwc) |
| 90 | { |
| 91 | struct dw_desc *desc, *_desc; |
| 92 | struct dw_desc *ret = NULL; |
| 93 | unsigned int i = 0; |
| 94 | |
| 95 | spin_lock_bh(&dwc->lock); |
| 96 | list_for_each_entry_safe(desc, _desc, &dwc->free_list, desc_node) { |
| 97 | if (async_tx_test_ack(&desc->txd)) { |
| 98 | list_del(&desc->desc_node); |
| 99 | ret = desc; |
| 100 | break; |
| 101 | } |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 102 | dev_dbg(chan2dev(&dwc->chan), "desc %p not ACKed\n", desc); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 103 | i++; |
| 104 | } |
| 105 | spin_unlock_bh(&dwc->lock); |
| 106 | |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 107 | dev_vdbg(chan2dev(&dwc->chan), "scanned %u descriptors on freelist\n", i); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 108 | |
| 109 | return ret; |
| 110 | } |
| 111 | |
| 112 | static void dwc_sync_desc_for_cpu(struct dw_dma_chan *dwc, struct dw_desc *desc) |
| 113 | { |
| 114 | struct dw_desc *child; |
| 115 | |
Dan Williams | e0bd0f8 | 2009-09-08 17:53:02 -0700 | [diff] [blame] | 116 | list_for_each_entry(child, &desc->tx_list, desc_node) |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 117 | dma_sync_single_for_cpu(chan2parent(&dwc->chan), |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 118 | child->txd.phys, sizeof(child->lli), |
| 119 | DMA_TO_DEVICE); |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 120 | dma_sync_single_for_cpu(chan2parent(&dwc->chan), |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 121 | desc->txd.phys, sizeof(desc->lli), |
| 122 | DMA_TO_DEVICE); |
| 123 | } |
| 124 | |
| 125 | /* |
| 126 | * Move a descriptor, including any children, to the free list. |
| 127 | * `desc' must not be on any lists. |
| 128 | */ |
| 129 | static void dwc_desc_put(struct dw_dma_chan *dwc, struct dw_desc *desc) |
| 130 | { |
| 131 | if (desc) { |
| 132 | struct dw_desc *child; |
| 133 | |
| 134 | dwc_sync_desc_for_cpu(dwc, desc); |
| 135 | |
| 136 | spin_lock_bh(&dwc->lock); |
Dan Williams | e0bd0f8 | 2009-09-08 17:53:02 -0700 | [diff] [blame] | 137 | list_for_each_entry(child, &desc->tx_list, desc_node) |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 138 | dev_vdbg(chan2dev(&dwc->chan), |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 139 | "moving child desc %p to freelist\n", |
| 140 | child); |
Dan Williams | e0bd0f8 | 2009-09-08 17:53:02 -0700 | [diff] [blame] | 141 | list_splice_init(&desc->tx_list, &dwc->free_list); |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 142 | dev_vdbg(chan2dev(&dwc->chan), "moving desc %p to freelist\n", desc); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 143 | list_add(&desc->desc_node, &dwc->free_list); |
| 144 | spin_unlock_bh(&dwc->lock); |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | /* Called with dwc->lock held and bh disabled */ |
| 149 | static dma_cookie_t |
| 150 | dwc_assign_cookie(struct dw_dma_chan *dwc, struct dw_desc *desc) |
| 151 | { |
| 152 | dma_cookie_t cookie = dwc->chan.cookie; |
| 153 | |
| 154 | if (++cookie < 0) |
| 155 | cookie = 1; |
| 156 | |
| 157 | dwc->chan.cookie = cookie; |
| 158 | desc->txd.cookie = cookie; |
| 159 | |
| 160 | return cookie; |
| 161 | } |
| 162 | |
| 163 | /*----------------------------------------------------------------------*/ |
| 164 | |
| 165 | /* Called with dwc->lock held and bh disabled */ |
| 166 | static void dwc_dostart(struct dw_dma_chan *dwc, struct dw_desc *first) |
| 167 | { |
| 168 | struct dw_dma *dw = to_dw_dma(dwc->chan.device); |
| 169 | |
| 170 | /* ASSERT: channel is idle */ |
| 171 | if (dma_readl(dw, CH_EN) & dwc->mask) { |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 172 | dev_err(chan2dev(&dwc->chan), |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 173 | "BUG: Attempted to start non-idle channel\n"); |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 174 | dev_err(chan2dev(&dwc->chan), |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 175 | " SAR: 0x%x DAR: 0x%x LLP: 0x%x CTL: 0x%x:%08x\n", |
| 176 | channel_readl(dwc, SAR), |
| 177 | channel_readl(dwc, DAR), |
| 178 | channel_readl(dwc, LLP), |
| 179 | channel_readl(dwc, CTL_HI), |
| 180 | channel_readl(dwc, CTL_LO)); |
| 181 | |
| 182 | /* The tasklet will hopefully advance the queue... */ |
| 183 | return; |
| 184 | } |
| 185 | |
| 186 | channel_writel(dwc, LLP, first->txd.phys); |
| 187 | channel_writel(dwc, CTL_LO, |
| 188 | DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN); |
| 189 | channel_writel(dwc, CTL_HI, 0); |
| 190 | channel_set_bit(dw, CH_EN, dwc->mask); |
| 191 | } |
| 192 | |
| 193 | /*----------------------------------------------------------------------*/ |
| 194 | |
| 195 | static void |
| 196 | dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc) |
| 197 | { |
| 198 | dma_async_tx_callback callback; |
| 199 | void *param; |
| 200 | struct dma_async_tx_descriptor *txd = &desc->txd; |
| 201 | |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 202 | dev_vdbg(chan2dev(&dwc->chan), "descriptor %u complete\n", txd->cookie); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 203 | |
| 204 | dwc->completed = txd->cookie; |
| 205 | callback = txd->callback; |
| 206 | param = txd->callback_param; |
| 207 | |
| 208 | dwc_sync_desc_for_cpu(dwc, desc); |
Dan Williams | e0bd0f8 | 2009-09-08 17:53:02 -0700 | [diff] [blame] | 209 | list_splice_init(&desc->tx_list, &dwc->free_list); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 210 | list_move(&desc->desc_node, &dwc->free_list); |
| 211 | |
Atsushi Nemoto | 657a77fa | 2009-09-08 17:53:05 -0700 | [diff] [blame] | 212 | if (!dwc->chan.private) { |
| 213 | struct device *parent = chan2parent(&dwc->chan); |
| 214 | if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP)) { |
| 215 | if (txd->flags & DMA_COMPL_DEST_UNMAP_SINGLE) |
| 216 | dma_unmap_single(parent, desc->lli.dar, |
| 217 | desc->len, DMA_FROM_DEVICE); |
| 218 | else |
| 219 | dma_unmap_page(parent, desc->lli.dar, |
| 220 | desc->len, DMA_FROM_DEVICE); |
| 221 | } |
| 222 | if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP)) { |
| 223 | if (txd->flags & DMA_COMPL_SRC_UNMAP_SINGLE) |
| 224 | dma_unmap_single(parent, desc->lli.sar, |
| 225 | desc->len, DMA_TO_DEVICE); |
| 226 | else |
| 227 | dma_unmap_page(parent, desc->lli.sar, |
| 228 | desc->len, DMA_TO_DEVICE); |
| 229 | } |
| 230 | } |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 231 | |
| 232 | /* |
| 233 | * The API requires that no submissions are done from a |
| 234 | * callback, so we don't need to drop the lock here |
| 235 | */ |
| 236 | if (callback) |
| 237 | callback(param); |
| 238 | } |
| 239 | |
| 240 | static void dwc_complete_all(struct dw_dma *dw, struct dw_dma_chan *dwc) |
| 241 | { |
| 242 | struct dw_desc *desc, *_desc; |
| 243 | LIST_HEAD(list); |
| 244 | |
| 245 | if (dma_readl(dw, CH_EN) & dwc->mask) { |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 246 | dev_err(chan2dev(&dwc->chan), |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 247 | "BUG: XFER bit set, but channel not idle!\n"); |
| 248 | |
| 249 | /* Try to continue after resetting the channel... */ |
| 250 | channel_clear_bit(dw, CH_EN, dwc->mask); |
| 251 | while (dma_readl(dw, CH_EN) & dwc->mask) |
| 252 | cpu_relax(); |
| 253 | } |
| 254 | |
| 255 | /* |
| 256 | * Submit queued descriptors ASAP, i.e. before we go through |
| 257 | * the completed ones. |
| 258 | */ |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 259 | list_splice_init(&dwc->active_list, &list); |
Viresh Kumar | f336e42 | 2011-03-03 15:47:16 +0530 | [diff] [blame] | 260 | if (!list_empty(&dwc->queue)) { |
| 261 | list_move(dwc->queue.next, &dwc->active_list); |
| 262 | dwc_dostart(dwc, dwc_first_active(dwc)); |
| 263 | } |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 264 | |
| 265 | list_for_each_entry_safe(desc, _desc, &list, desc_node) |
| 266 | dwc_descriptor_complete(dwc, desc); |
| 267 | } |
| 268 | |
| 269 | static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc) |
| 270 | { |
| 271 | dma_addr_t llp; |
| 272 | struct dw_desc *desc, *_desc; |
| 273 | struct dw_desc *child; |
| 274 | u32 status_xfer; |
| 275 | |
| 276 | /* |
| 277 | * Clear block interrupt flag before scanning so that we don't |
| 278 | * miss any, and read LLP before RAW_XFER to ensure it is |
| 279 | * valid if we decide to scan the list. |
| 280 | */ |
| 281 | dma_writel(dw, CLEAR.BLOCK, dwc->mask); |
| 282 | llp = channel_readl(dwc, LLP); |
| 283 | status_xfer = dma_readl(dw, RAW.XFER); |
| 284 | |
| 285 | if (status_xfer & dwc->mask) { |
| 286 | /* Everything we've submitted is done */ |
| 287 | dma_writel(dw, CLEAR.XFER, dwc->mask); |
| 288 | dwc_complete_all(dw, dwc); |
| 289 | return; |
| 290 | } |
| 291 | |
Jamie Iles | 087809f | 2011-01-21 14:11:52 +0000 | [diff] [blame] | 292 | if (list_empty(&dwc->active_list)) |
| 293 | return; |
| 294 | |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 295 | dev_vdbg(chan2dev(&dwc->chan), "scan_descriptors: llp=0x%x\n", llp); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 296 | |
| 297 | list_for_each_entry_safe(desc, _desc, &dwc->active_list, desc_node) { |
| 298 | if (desc->lli.llp == llp) |
| 299 | /* This one is currently in progress */ |
| 300 | return; |
| 301 | |
Dan Williams | e0bd0f8 | 2009-09-08 17:53:02 -0700 | [diff] [blame] | 302 | list_for_each_entry(child, &desc->tx_list, desc_node) |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 303 | if (child->lli.llp == llp) |
| 304 | /* Currently in progress */ |
| 305 | return; |
| 306 | |
| 307 | /* |
| 308 | * No descriptors so far seem to be in progress, i.e. |
| 309 | * this one must be done. |
| 310 | */ |
| 311 | dwc_descriptor_complete(dwc, desc); |
| 312 | } |
| 313 | |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 314 | dev_err(chan2dev(&dwc->chan), |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 315 | "BUG: All descriptors done, but channel not idle!\n"); |
| 316 | |
| 317 | /* Try to continue after resetting the channel... */ |
| 318 | channel_clear_bit(dw, CH_EN, dwc->mask); |
| 319 | while (dma_readl(dw, CH_EN) & dwc->mask) |
| 320 | cpu_relax(); |
| 321 | |
| 322 | if (!list_empty(&dwc->queue)) { |
Viresh Kumar | f336e42 | 2011-03-03 15:47:16 +0530 | [diff] [blame] | 323 | list_move(dwc->queue.next, &dwc->active_list); |
| 324 | dwc_dostart(dwc, dwc_first_active(dwc)); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 325 | } |
| 326 | } |
| 327 | |
| 328 | static void dwc_dump_lli(struct dw_dma_chan *dwc, struct dw_lli *lli) |
| 329 | { |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 330 | dev_printk(KERN_CRIT, chan2dev(&dwc->chan), |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 331 | " desc: s0x%x d0x%x l0x%x c0x%x:%x\n", |
| 332 | lli->sar, lli->dar, lli->llp, |
| 333 | lli->ctlhi, lli->ctllo); |
| 334 | } |
| 335 | |
| 336 | static void dwc_handle_error(struct dw_dma *dw, struct dw_dma_chan *dwc) |
| 337 | { |
| 338 | struct dw_desc *bad_desc; |
| 339 | struct dw_desc *child; |
| 340 | |
| 341 | dwc_scan_descriptors(dw, dwc); |
| 342 | |
| 343 | /* |
| 344 | * The descriptor currently at the head of the active list is |
| 345 | * borked. Since we don't have any way to report errors, we'll |
| 346 | * just have to scream loudly and try to carry on. |
| 347 | */ |
| 348 | bad_desc = dwc_first_active(dwc); |
| 349 | list_del_init(&bad_desc->desc_node); |
Viresh Kumar | f336e42 | 2011-03-03 15:47:16 +0530 | [diff] [blame] | 350 | list_move(dwc->queue.next, dwc->active_list.prev); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 351 | |
| 352 | /* Clear the error flag and try to restart the controller */ |
| 353 | dma_writel(dw, CLEAR.ERROR, dwc->mask); |
| 354 | if (!list_empty(&dwc->active_list)) |
| 355 | dwc_dostart(dwc, dwc_first_active(dwc)); |
| 356 | |
| 357 | /* |
| 358 | * KERN_CRITICAL may seem harsh, but since this only happens |
| 359 | * when someone submits a bad physical address in a |
| 360 | * descriptor, we should consider ourselves lucky that the |
| 361 | * controller flagged an error instead of scribbling over |
| 362 | * random memory locations. |
| 363 | */ |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 364 | dev_printk(KERN_CRIT, chan2dev(&dwc->chan), |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 365 | "Bad descriptor submitted for DMA!\n"); |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 366 | dev_printk(KERN_CRIT, chan2dev(&dwc->chan), |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 367 | " cookie: %d\n", bad_desc->txd.cookie); |
| 368 | dwc_dump_lli(dwc, &bad_desc->lli); |
Dan Williams | e0bd0f8 | 2009-09-08 17:53:02 -0700 | [diff] [blame] | 369 | list_for_each_entry(child, &bad_desc->tx_list, desc_node) |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 370 | dwc_dump_lli(dwc, &child->lli); |
| 371 | |
| 372 | /* Pretend the descriptor completed successfully */ |
| 373 | dwc_descriptor_complete(dwc, bad_desc); |
| 374 | } |
| 375 | |
Hans-Christian Egtvedt | d9de451 | 2009-04-01 15:47:02 +0200 | [diff] [blame] | 376 | /* --------------------- Cyclic DMA API extensions -------------------- */ |
| 377 | |
| 378 | inline dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan) |
| 379 | { |
| 380 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); |
| 381 | return channel_readl(dwc, SAR); |
| 382 | } |
| 383 | EXPORT_SYMBOL(dw_dma_get_src_addr); |
| 384 | |
| 385 | inline dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan) |
| 386 | { |
| 387 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); |
| 388 | return channel_readl(dwc, DAR); |
| 389 | } |
| 390 | EXPORT_SYMBOL(dw_dma_get_dst_addr); |
| 391 | |
| 392 | /* called with dwc->lock held and all DMAC interrupts disabled */ |
| 393 | static void dwc_handle_cyclic(struct dw_dma *dw, struct dw_dma_chan *dwc, |
| 394 | u32 status_block, u32 status_err, u32 status_xfer) |
| 395 | { |
| 396 | if (status_block & dwc->mask) { |
| 397 | void (*callback)(void *param); |
| 398 | void *callback_param; |
| 399 | |
| 400 | dev_vdbg(chan2dev(&dwc->chan), "new cyclic period llp 0x%08x\n", |
| 401 | channel_readl(dwc, LLP)); |
| 402 | dma_writel(dw, CLEAR.BLOCK, dwc->mask); |
| 403 | |
| 404 | callback = dwc->cdesc->period_callback; |
| 405 | callback_param = dwc->cdesc->period_callback_param; |
| 406 | if (callback) { |
| 407 | spin_unlock(&dwc->lock); |
| 408 | callback(callback_param); |
| 409 | spin_lock(&dwc->lock); |
| 410 | } |
| 411 | } |
| 412 | |
| 413 | /* |
| 414 | * Error and transfer complete are highly unlikely, and will most |
| 415 | * likely be due to a configuration error by the user. |
| 416 | */ |
| 417 | if (unlikely(status_err & dwc->mask) || |
| 418 | unlikely(status_xfer & dwc->mask)) { |
| 419 | int i; |
| 420 | |
| 421 | dev_err(chan2dev(&dwc->chan), "cyclic DMA unexpected %s " |
| 422 | "interrupt, stopping DMA transfer\n", |
| 423 | status_xfer ? "xfer" : "error"); |
| 424 | dev_err(chan2dev(&dwc->chan), |
| 425 | " SAR: 0x%x DAR: 0x%x LLP: 0x%x CTL: 0x%x:%08x\n", |
| 426 | channel_readl(dwc, SAR), |
| 427 | channel_readl(dwc, DAR), |
| 428 | channel_readl(dwc, LLP), |
| 429 | channel_readl(dwc, CTL_HI), |
| 430 | channel_readl(dwc, CTL_LO)); |
| 431 | |
| 432 | channel_clear_bit(dw, CH_EN, dwc->mask); |
| 433 | while (dma_readl(dw, CH_EN) & dwc->mask) |
| 434 | cpu_relax(); |
| 435 | |
| 436 | /* make sure DMA does not restart by loading a new list */ |
| 437 | channel_writel(dwc, LLP, 0); |
| 438 | channel_writel(dwc, CTL_LO, 0); |
| 439 | channel_writel(dwc, CTL_HI, 0); |
| 440 | |
| 441 | dma_writel(dw, CLEAR.BLOCK, dwc->mask); |
| 442 | dma_writel(dw, CLEAR.ERROR, dwc->mask); |
| 443 | dma_writel(dw, CLEAR.XFER, dwc->mask); |
| 444 | |
| 445 | for (i = 0; i < dwc->cdesc->periods; i++) |
| 446 | dwc_dump_lli(dwc, &dwc->cdesc->desc[i]->lli); |
| 447 | } |
| 448 | } |
| 449 | |
| 450 | /* ------------------------------------------------------------------------- */ |
| 451 | |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 452 | static void dw_dma_tasklet(unsigned long data) |
| 453 | { |
| 454 | struct dw_dma *dw = (struct dw_dma *)data; |
| 455 | struct dw_dma_chan *dwc; |
| 456 | u32 status_block; |
| 457 | u32 status_xfer; |
| 458 | u32 status_err; |
| 459 | int i; |
| 460 | |
| 461 | status_block = dma_readl(dw, RAW.BLOCK); |
Haavard Skinnemoen | 7fe7b2f | 2008-10-03 15:23:46 -0700 | [diff] [blame] | 462 | status_xfer = dma_readl(dw, RAW.XFER); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 463 | status_err = dma_readl(dw, RAW.ERROR); |
| 464 | |
| 465 | dev_vdbg(dw->dma.dev, "tasklet: status_block=%x status_err=%x\n", |
| 466 | status_block, status_err); |
| 467 | |
| 468 | for (i = 0; i < dw->dma.chancnt; i++) { |
| 469 | dwc = &dw->chan[i]; |
| 470 | spin_lock(&dwc->lock); |
Hans-Christian Egtvedt | d9de451 | 2009-04-01 15:47:02 +0200 | [diff] [blame] | 471 | if (test_bit(DW_DMA_IS_CYCLIC, &dwc->flags)) |
| 472 | dwc_handle_cyclic(dw, dwc, status_block, status_err, |
| 473 | status_xfer); |
| 474 | else if (status_err & (1 << i)) |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 475 | dwc_handle_error(dw, dwc); |
| 476 | else if ((status_block | status_xfer) & (1 << i)) |
| 477 | dwc_scan_descriptors(dw, dwc); |
| 478 | spin_unlock(&dwc->lock); |
| 479 | } |
| 480 | |
| 481 | /* |
| 482 | * Re-enable interrupts. Block Complete interrupts are only |
| 483 | * enabled if the INT_EN bit in the descriptor is set. This |
| 484 | * will trigger a scan before the whole list is done. |
| 485 | */ |
| 486 | channel_set_bit(dw, MASK.XFER, dw->all_chan_mask); |
| 487 | channel_set_bit(dw, MASK.BLOCK, dw->all_chan_mask); |
| 488 | channel_set_bit(dw, MASK.ERROR, dw->all_chan_mask); |
| 489 | } |
| 490 | |
| 491 | static irqreturn_t dw_dma_interrupt(int irq, void *dev_id) |
| 492 | { |
| 493 | struct dw_dma *dw = dev_id; |
| 494 | u32 status; |
| 495 | |
| 496 | dev_vdbg(dw->dma.dev, "interrupt: status=0x%x\n", |
| 497 | dma_readl(dw, STATUS_INT)); |
| 498 | |
| 499 | /* |
| 500 | * Just disable the interrupts. We'll turn them back on in the |
| 501 | * softirq handler. |
| 502 | */ |
| 503 | channel_clear_bit(dw, MASK.XFER, dw->all_chan_mask); |
| 504 | channel_clear_bit(dw, MASK.BLOCK, dw->all_chan_mask); |
| 505 | channel_clear_bit(dw, MASK.ERROR, dw->all_chan_mask); |
| 506 | |
| 507 | status = dma_readl(dw, STATUS_INT); |
| 508 | if (status) { |
| 509 | dev_err(dw->dma.dev, |
| 510 | "BUG: Unexpected interrupts pending: 0x%x\n", |
| 511 | status); |
| 512 | |
| 513 | /* Try to recover */ |
| 514 | channel_clear_bit(dw, MASK.XFER, (1 << 8) - 1); |
| 515 | channel_clear_bit(dw, MASK.BLOCK, (1 << 8) - 1); |
| 516 | channel_clear_bit(dw, MASK.SRC_TRAN, (1 << 8) - 1); |
| 517 | channel_clear_bit(dw, MASK.DST_TRAN, (1 << 8) - 1); |
| 518 | channel_clear_bit(dw, MASK.ERROR, (1 << 8) - 1); |
| 519 | } |
| 520 | |
| 521 | tasklet_schedule(&dw->tasklet); |
| 522 | |
| 523 | return IRQ_HANDLED; |
| 524 | } |
| 525 | |
| 526 | /*----------------------------------------------------------------------*/ |
| 527 | |
| 528 | static dma_cookie_t dwc_tx_submit(struct dma_async_tx_descriptor *tx) |
| 529 | { |
| 530 | struct dw_desc *desc = txd_to_dw_desc(tx); |
| 531 | struct dw_dma_chan *dwc = to_dw_dma_chan(tx->chan); |
| 532 | dma_cookie_t cookie; |
| 533 | |
| 534 | spin_lock_bh(&dwc->lock); |
| 535 | cookie = dwc_assign_cookie(dwc, desc); |
| 536 | |
| 537 | /* |
| 538 | * REVISIT: We should attempt to chain as many descriptors as |
| 539 | * possible, perhaps even appending to those already submitted |
| 540 | * for DMA. But this is hard to do in a race-free manner. |
| 541 | */ |
| 542 | if (list_empty(&dwc->active_list)) { |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 543 | dev_vdbg(chan2dev(tx->chan), "tx_submit: started %u\n", |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 544 | desc->txd.cookie); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 545 | list_add_tail(&desc->desc_node, &dwc->active_list); |
Viresh Kumar | f336e42 | 2011-03-03 15:47:16 +0530 | [diff] [blame] | 546 | dwc_dostart(dwc, dwc_first_active(dwc)); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 547 | } else { |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 548 | dev_vdbg(chan2dev(tx->chan), "tx_submit: queued %u\n", |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 549 | desc->txd.cookie); |
| 550 | |
| 551 | list_add_tail(&desc->desc_node, &dwc->queue); |
| 552 | } |
| 553 | |
| 554 | spin_unlock_bh(&dwc->lock); |
| 555 | |
| 556 | return cookie; |
| 557 | } |
| 558 | |
| 559 | static struct dma_async_tx_descriptor * |
| 560 | dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, |
| 561 | size_t len, unsigned long flags) |
| 562 | { |
| 563 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); |
| 564 | struct dw_desc *desc; |
| 565 | struct dw_desc *first; |
| 566 | struct dw_desc *prev; |
| 567 | size_t xfer_count; |
| 568 | size_t offset; |
| 569 | unsigned int src_width; |
| 570 | unsigned int dst_width; |
| 571 | u32 ctllo; |
| 572 | |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 573 | dev_vdbg(chan2dev(chan), "prep_dma_memcpy d0x%x s0x%x l0x%zx f0x%lx\n", |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 574 | dest, src, len, flags); |
| 575 | |
| 576 | if (unlikely(!len)) { |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 577 | dev_dbg(chan2dev(chan), "prep_dma_memcpy: length is zero!\n"); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 578 | return NULL; |
| 579 | } |
| 580 | |
| 581 | /* |
| 582 | * We can be a lot more clever here, but this should take care |
| 583 | * of the most common optimization. |
| 584 | */ |
Viresh Kumar | a022745 | 2011-03-03 15:47:18 +0530 | [diff] [blame] | 585 | if (!((src | dest | len) & 7)) |
| 586 | src_width = dst_width = 3; |
| 587 | else if (!((src | dest | len) & 3)) |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 588 | src_width = dst_width = 2; |
| 589 | else if (!((src | dest | len) & 1)) |
| 590 | src_width = dst_width = 1; |
| 591 | else |
| 592 | src_width = dst_width = 0; |
| 593 | |
Jamie Iles | f301c06 | 2011-01-21 14:11:53 +0000 | [diff] [blame] | 594 | ctllo = DWC_DEFAULT_CTLLO(chan->private) |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 595 | | DWC_CTLL_DST_WIDTH(dst_width) |
| 596 | | DWC_CTLL_SRC_WIDTH(src_width) |
| 597 | | DWC_CTLL_DST_INC |
| 598 | | DWC_CTLL_SRC_INC |
| 599 | | DWC_CTLL_FC_M2M; |
| 600 | prev = first = NULL; |
| 601 | |
| 602 | for (offset = 0; offset < len; offset += xfer_count << src_width) { |
| 603 | xfer_count = min_t(size_t, (len - offset) >> src_width, |
| 604 | DWC_MAX_COUNT); |
| 605 | |
| 606 | desc = dwc_desc_get(dwc); |
| 607 | if (!desc) |
| 608 | goto err_desc_get; |
| 609 | |
| 610 | desc->lli.sar = src + offset; |
| 611 | desc->lli.dar = dest + offset; |
| 612 | desc->lli.ctllo = ctllo; |
| 613 | desc->lli.ctlhi = xfer_count; |
| 614 | |
| 615 | if (!first) { |
| 616 | first = desc; |
| 617 | } else { |
| 618 | prev->lli.llp = desc->txd.phys; |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 619 | dma_sync_single_for_device(chan2parent(chan), |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 620 | prev->txd.phys, sizeof(prev->lli), |
| 621 | DMA_TO_DEVICE); |
| 622 | list_add_tail(&desc->desc_node, |
Dan Williams | e0bd0f8 | 2009-09-08 17:53:02 -0700 | [diff] [blame] | 623 | &first->tx_list); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 624 | } |
| 625 | prev = desc; |
| 626 | } |
| 627 | |
| 628 | |
| 629 | if (flags & DMA_PREP_INTERRUPT) |
| 630 | /* Trigger interrupt after last block */ |
| 631 | prev->lli.ctllo |= DWC_CTLL_INT_EN; |
| 632 | |
| 633 | prev->lli.llp = 0; |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 634 | dma_sync_single_for_device(chan2parent(chan), |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 635 | prev->txd.phys, sizeof(prev->lli), |
| 636 | DMA_TO_DEVICE); |
| 637 | |
| 638 | first->txd.flags = flags; |
| 639 | first->len = len; |
| 640 | |
| 641 | return &first->txd; |
| 642 | |
| 643 | err_desc_get: |
| 644 | dwc_desc_put(dwc, first); |
| 645 | return NULL; |
| 646 | } |
| 647 | |
| 648 | static struct dma_async_tx_descriptor * |
| 649 | dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, |
| 650 | unsigned int sg_len, enum dma_data_direction direction, |
| 651 | unsigned long flags) |
| 652 | { |
| 653 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); |
Dan Williams | 287d859 | 2009-02-18 14:48:26 -0800 | [diff] [blame] | 654 | struct dw_dma_slave *dws = chan->private; |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 655 | struct dw_desc *prev; |
| 656 | struct dw_desc *first; |
| 657 | u32 ctllo; |
| 658 | dma_addr_t reg; |
| 659 | unsigned int reg_width; |
| 660 | unsigned int mem_width; |
| 661 | unsigned int i; |
| 662 | struct scatterlist *sg; |
| 663 | size_t total_len = 0; |
| 664 | |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 665 | dev_vdbg(chan2dev(chan), "prep_dma_slave\n"); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 666 | |
| 667 | if (unlikely(!dws || !sg_len)) |
| 668 | return NULL; |
| 669 | |
Dan Williams | 74465b4 | 2009-01-06 11:38:16 -0700 | [diff] [blame] | 670 | reg_width = dws->reg_width; |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 671 | prev = first = NULL; |
| 672 | |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 673 | switch (direction) { |
| 674 | case DMA_TO_DEVICE: |
Jamie Iles | f301c06 | 2011-01-21 14:11:53 +0000 | [diff] [blame] | 675 | ctllo = (DWC_DEFAULT_CTLLO(chan->private) |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 676 | | DWC_CTLL_DST_WIDTH(reg_width) |
| 677 | | DWC_CTLL_DST_FIX |
| 678 | | DWC_CTLL_SRC_INC |
| 679 | | DWC_CTLL_FC_M2P); |
Dan Williams | 74465b4 | 2009-01-06 11:38:16 -0700 | [diff] [blame] | 680 | reg = dws->tx_reg; |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 681 | for_each_sg(sgl, sg, sg_len, i) { |
| 682 | struct dw_desc *desc; |
| 683 | u32 len; |
| 684 | u32 mem; |
| 685 | |
| 686 | desc = dwc_desc_get(dwc); |
| 687 | if (!desc) { |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 688 | dev_err(chan2dev(chan), |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 689 | "not enough descriptors available\n"); |
| 690 | goto err_desc_get; |
| 691 | } |
| 692 | |
| 693 | mem = sg_phys(sg); |
| 694 | len = sg_dma_len(sg); |
| 695 | mem_width = 2; |
| 696 | if (unlikely(mem & 3 || len & 3)) |
| 697 | mem_width = 0; |
| 698 | |
| 699 | desc->lli.sar = mem; |
| 700 | desc->lli.dar = reg; |
| 701 | desc->lli.ctllo = ctllo | DWC_CTLL_SRC_WIDTH(mem_width); |
| 702 | desc->lli.ctlhi = len >> mem_width; |
| 703 | |
| 704 | if (!first) { |
| 705 | first = desc; |
| 706 | } else { |
| 707 | prev->lli.llp = desc->txd.phys; |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 708 | dma_sync_single_for_device(chan2parent(chan), |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 709 | prev->txd.phys, |
| 710 | sizeof(prev->lli), |
| 711 | DMA_TO_DEVICE); |
| 712 | list_add_tail(&desc->desc_node, |
Dan Williams | e0bd0f8 | 2009-09-08 17:53:02 -0700 | [diff] [blame] | 713 | &first->tx_list); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 714 | } |
| 715 | prev = desc; |
| 716 | total_len += len; |
| 717 | } |
| 718 | break; |
| 719 | case DMA_FROM_DEVICE: |
Jamie Iles | f301c06 | 2011-01-21 14:11:53 +0000 | [diff] [blame] | 720 | ctllo = (DWC_DEFAULT_CTLLO(chan->private) |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 721 | | DWC_CTLL_SRC_WIDTH(reg_width) |
| 722 | | DWC_CTLL_DST_INC |
| 723 | | DWC_CTLL_SRC_FIX |
| 724 | | DWC_CTLL_FC_P2M); |
| 725 | |
Dan Williams | 74465b4 | 2009-01-06 11:38:16 -0700 | [diff] [blame] | 726 | reg = dws->rx_reg; |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 727 | for_each_sg(sgl, sg, sg_len, i) { |
| 728 | struct dw_desc *desc; |
| 729 | u32 len; |
| 730 | u32 mem; |
| 731 | |
| 732 | desc = dwc_desc_get(dwc); |
| 733 | if (!desc) { |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 734 | dev_err(chan2dev(chan), |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 735 | "not enough descriptors available\n"); |
| 736 | goto err_desc_get; |
| 737 | } |
| 738 | |
| 739 | mem = sg_phys(sg); |
| 740 | len = sg_dma_len(sg); |
| 741 | mem_width = 2; |
| 742 | if (unlikely(mem & 3 || len & 3)) |
| 743 | mem_width = 0; |
| 744 | |
| 745 | desc->lli.sar = reg; |
| 746 | desc->lli.dar = mem; |
| 747 | desc->lli.ctllo = ctllo | DWC_CTLL_DST_WIDTH(mem_width); |
| 748 | desc->lli.ctlhi = len >> reg_width; |
| 749 | |
| 750 | if (!first) { |
| 751 | first = desc; |
| 752 | } else { |
| 753 | prev->lli.llp = desc->txd.phys; |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 754 | dma_sync_single_for_device(chan2parent(chan), |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 755 | prev->txd.phys, |
| 756 | sizeof(prev->lli), |
| 757 | DMA_TO_DEVICE); |
| 758 | list_add_tail(&desc->desc_node, |
Dan Williams | e0bd0f8 | 2009-09-08 17:53:02 -0700 | [diff] [blame] | 759 | &first->tx_list); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 760 | } |
| 761 | prev = desc; |
| 762 | total_len += len; |
| 763 | } |
| 764 | break; |
| 765 | default: |
| 766 | return NULL; |
| 767 | } |
| 768 | |
| 769 | if (flags & DMA_PREP_INTERRUPT) |
| 770 | /* Trigger interrupt after last block */ |
| 771 | prev->lli.ctllo |= DWC_CTLL_INT_EN; |
| 772 | |
| 773 | prev->lli.llp = 0; |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 774 | dma_sync_single_for_device(chan2parent(chan), |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 775 | prev->txd.phys, sizeof(prev->lli), |
| 776 | DMA_TO_DEVICE); |
| 777 | |
| 778 | first->len = total_len; |
| 779 | |
| 780 | return &first->txd; |
| 781 | |
| 782 | err_desc_get: |
| 783 | dwc_desc_put(dwc, first); |
| 784 | return NULL; |
| 785 | } |
| 786 | |
Linus Walleij | 0582763 | 2010-05-17 16:30:42 -0700 | [diff] [blame] | 787 | static int dwc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, |
| 788 | unsigned long arg) |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 789 | { |
| 790 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); |
| 791 | struct dw_dma *dw = to_dw_dma(chan->device); |
| 792 | struct dw_desc *desc, *_desc; |
| 793 | LIST_HEAD(list); |
| 794 | |
Linus Walleij | c3635c7 | 2010-03-26 16:44:01 -0700 | [diff] [blame] | 795 | /* Only supports DMA_TERMINATE_ALL */ |
| 796 | if (cmd != DMA_TERMINATE_ALL) |
| 797 | return -ENXIO; |
| 798 | |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 799 | /* |
| 800 | * This is only called when something went wrong elsewhere, so |
| 801 | * we don't really care about the data. Just disable the |
| 802 | * channel. We still have to poll the channel enable bit due |
| 803 | * to AHB/HSB limitations. |
| 804 | */ |
| 805 | spin_lock_bh(&dwc->lock); |
| 806 | |
| 807 | channel_clear_bit(dw, CH_EN, dwc->mask); |
| 808 | |
| 809 | while (dma_readl(dw, CH_EN) & dwc->mask) |
| 810 | cpu_relax(); |
| 811 | |
| 812 | /* active_list entries will end up before queued entries */ |
| 813 | list_splice_init(&dwc->queue, &list); |
| 814 | list_splice_init(&dwc->active_list, &list); |
| 815 | |
| 816 | spin_unlock_bh(&dwc->lock); |
| 817 | |
| 818 | /* Flush all pending and queued descriptors */ |
| 819 | list_for_each_entry_safe(desc, _desc, &list, desc_node) |
| 820 | dwc_descriptor_complete(dwc, desc); |
Linus Walleij | c3635c7 | 2010-03-26 16:44:01 -0700 | [diff] [blame] | 821 | |
| 822 | return 0; |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 823 | } |
| 824 | |
| 825 | static enum dma_status |
Linus Walleij | 0793448 | 2010-03-26 16:50:49 -0700 | [diff] [blame] | 826 | dwc_tx_status(struct dma_chan *chan, |
| 827 | dma_cookie_t cookie, |
| 828 | struct dma_tx_state *txstate) |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 829 | { |
| 830 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); |
| 831 | dma_cookie_t last_used; |
| 832 | dma_cookie_t last_complete; |
| 833 | int ret; |
| 834 | |
| 835 | last_complete = dwc->completed; |
| 836 | last_used = chan->cookie; |
| 837 | |
| 838 | ret = dma_async_is_complete(cookie, last_complete, last_used); |
| 839 | if (ret != DMA_SUCCESS) { |
Viresh Kumar | 569432e | 2011-03-03 15:47:17 +0530 | [diff] [blame] | 840 | spin_lock_bh(&dwc->lock); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 841 | dwc_scan_descriptors(to_dw_dma(chan->device), dwc); |
Viresh Kumar | 569432e | 2011-03-03 15:47:17 +0530 | [diff] [blame] | 842 | spin_unlock_bh(&dwc->lock); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 843 | |
| 844 | last_complete = dwc->completed; |
| 845 | last_used = chan->cookie; |
| 846 | |
| 847 | ret = dma_async_is_complete(cookie, last_complete, last_used); |
| 848 | } |
| 849 | |
Dan Williams | bca3469 | 2010-03-26 16:52:10 -0700 | [diff] [blame] | 850 | dma_set_tx_state(txstate, last_complete, last_used, 0); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 851 | |
| 852 | return ret; |
| 853 | } |
| 854 | |
| 855 | static void dwc_issue_pending(struct dma_chan *chan) |
| 856 | { |
| 857 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); |
| 858 | |
| 859 | spin_lock_bh(&dwc->lock); |
| 860 | if (!list_empty(&dwc->queue)) |
| 861 | dwc_scan_descriptors(to_dw_dma(chan->device), dwc); |
| 862 | spin_unlock_bh(&dwc->lock); |
| 863 | } |
| 864 | |
Dan Williams | aa1e6f1 | 2009-01-06 11:38:17 -0700 | [diff] [blame] | 865 | static int dwc_alloc_chan_resources(struct dma_chan *chan) |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 866 | { |
| 867 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); |
| 868 | struct dw_dma *dw = to_dw_dma(chan->device); |
| 869 | struct dw_desc *desc; |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 870 | struct dw_dma_slave *dws; |
| 871 | int i; |
| 872 | u32 cfghi; |
| 873 | u32 cfglo; |
| 874 | |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 875 | dev_vdbg(chan2dev(chan), "alloc_chan_resources\n"); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 876 | |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 877 | /* ASSERT: channel is idle */ |
| 878 | if (dma_readl(dw, CH_EN) & dwc->mask) { |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 879 | dev_dbg(chan2dev(chan), "DMA channel not idle?\n"); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 880 | return -EIO; |
| 881 | } |
| 882 | |
| 883 | dwc->completed = chan->cookie = 1; |
| 884 | |
| 885 | cfghi = DWC_CFGH_FIFO_MODE; |
| 886 | cfglo = 0; |
| 887 | |
Dan Williams | 287d859 | 2009-02-18 14:48:26 -0800 | [diff] [blame] | 888 | dws = chan->private; |
Dan Williams | 74465b4 | 2009-01-06 11:38:16 -0700 | [diff] [blame] | 889 | if (dws) { |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 890 | /* |
| 891 | * We need controller-specific data to set up slave |
| 892 | * transfers. |
| 893 | */ |
Dan Williams | 74465b4 | 2009-01-06 11:38:16 -0700 | [diff] [blame] | 894 | BUG_ON(!dws->dma_dev || dws->dma_dev != dw->dma.dev); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 895 | |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 896 | cfghi = dws->cfg_hi; |
| 897 | cfglo = dws->cfg_lo; |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 898 | } |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 899 | channel_writel(dwc, CFG_LO, cfglo); |
| 900 | channel_writel(dwc, CFG_HI, cfghi); |
| 901 | |
| 902 | /* |
| 903 | * NOTE: some controllers may have additional features that we |
| 904 | * need to initialize here, like "scatter-gather" (which |
| 905 | * doesn't mean what you think it means), and status writeback. |
| 906 | */ |
| 907 | |
| 908 | spin_lock_bh(&dwc->lock); |
| 909 | i = dwc->descs_allocated; |
| 910 | while (dwc->descs_allocated < NR_DESCS_PER_CHANNEL) { |
| 911 | spin_unlock_bh(&dwc->lock); |
| 912 | |
| 913 | desc = kzalloc(sizeof(struct dw_desc), GFP_KERNEL); |
| 914 | if (!desc) { |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 915 | dev_info(chan2dev(chan), |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 916 | "only allocated %d descriptors\n", i); |
| 917 | spin_lock_bh(&dwc->lock); |
| 918 | break; |
| 919 | } |
| 920 | |
Dan Williams | e0bd0f8 | 2009-09-08 17:53:02 -0700 | [diff] [blame] | 921 | INIT_LIST_HEAD(&desc->tx_list); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 922 | dma_async_tx_descriptor_init(&desc->txd, chan); |
| 923 | desc->txd.tx_submit = dwc_tx_submit; |
| 924 | desc->txd.flags = DMA_CTRL_ACK; |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 925 | desc->txd.phys = dma_map_single(chan2parent(chan), &desc->lli, |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 926 | sizeof(desc->lli), DMA_TO_DEVICE); |
| 927 | dwc_desc_put(dwc, desc); |
| 928 | |
| 929 | spin_lock_bh(&dwc->lock); |
| 930 | i = ++dwc->descs_allocated; |
| 931 | } |
| 932 | |
| 933 | /* Enable interrupts */ |
| 934 | channel_set_bit(dw, MASK.XFER, dwc->mask); |
| 935 | channel_set_bit(dw, MASK.BLOCK, dwc->mask); |
| 936 | channel_set_bit(dw, MASK.ERROR, dwc->mask); |
| 937 | |
| 938 | spin_unlock_bh(&dwc->lock); |
| 939 | |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 940 | dev_dbg(chan2dev(chan), |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 941 | "alloc_chan_resources allocated %d descriptors\n", i); |
| 942 | |
| 943 | return i; |
| 944 | } |
| 945 | |
| 946 | static void dwc_free_chan_resources(struct dma_chan *chan) |
| 947 | { |
| 948 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); |
| 949 | struct dw_dma *dw = to_dw_dma(chan->device); |
| 950 | struct dw_desc *desc, *_desc; |
| 951 | LIST_HEAD(list); |
| 952 | |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 953 | dev_dbg(chan2dev(chan), "free_chan_resources (descs allocated=%u)\n", |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 954 | dwc->descs_allocated); |
| 955 | |
| 956 | /* ASSERT: channel is idle */ |
| 957 | BUG_ON(!list_empty(&dwc->active_list)); |
| 958 | BUG_ON(!list_empty(&dwc->queue)); |
| 959 | BUG_ON(dma_readl(to_dw_dma(chan->device), CH_EN) & dwc->mask); |
| 960 | |
| 961 | spin_lock_bh(&dwc->lock); |
| 962 | list_splice_init(&dwc->free_list, &list); |
| 963 | dwc->descs_allocated = 0; |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 964 | |
| 965 | /* Disable interrupts */ |
| 966 | channel_clear_bit(dw, MASK.XFER, dwc->mask); |
| 967 | channel_clear_bit(dw, MASK.BLOCK, dwc->mask); |
| 968 | channel_clear_bit(dw, MASK.ERROR, dwc->mask); |
| 969 | |
| 970 | spin_unlock_bh(&dwc->lock); |
| 971 | |
| 972 | list_for_each_entry_safe(desc, _desc, &list, desc_node) { |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 973 | dev_vdbg(chan2dev(chan), " freeing descriptor %p\n", desc); |
| 974 | dma_unmap_single(chan2parent(chan), desc->txd.phys, |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 975 | sizeof(desc->lli), DMA_TO_DEVICE); |
| 976 | kfree(desc); |
| 977 | } |
| 978 | |
Dan Williams | 41d5e59 | 2009-01-06 11:38:21 -0700 | [diff] [blame] | 979 | dev_vdbg(chan2dev(chan), "free_chan_resources done\n"); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 980 | } |
| 981 | |
Hans-Christian Egtvedt | d9de451 | 2009-04-01 15:47:02 +0200 | [diff] [blame] | 982 | /* --------------------- Cyclic DMA API extensions -------------------- */ |
| 983 | |
| 984 | /** |
| 985 | * dw_dma_cyclic_start - start the cyclic DMA transfer |
| 986 | * @chan: the DMA channel to start |
| 987 | * |
| 988 | * Must be called with soft interrupts disabled. Returns zero on success or |
| 989 | * -errno on failure. |
| 990 | */ |
| 991 | int dw_dma_cyclic_start(struct dma_chan *chan) |
| 992 | { |
| 993 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); |
| 994 | struct dw_dma *dw = to_dw_dma(dwc->chan.device); |
| 995 | |
| 996 | if (!test_bit(DW_DMA_IS_CYCLIC, &dwc->flags)) { |
| 997 | dev_err(chan2dev(&dwc->chan), "missing prep for cyclic DMA\n"); |
| 998 | return -ENODEV; |
| 999 | } |
| 1000 | |
| 1001 | spin_lock(&dwc->lock); |
| 1002 | |
| 1003 | /* assert channel is idle */ |
| 1004 | if (dma_readl(dw, CH_EN) & dwc->mask) { |
| 1005 | dev_err(chan2dev(&dwc->chan), |
| 1006 | "BUG: Attempted to start non-idle channel\n"); |
| 1007 | dev_err(chan2dev(&dwc->chan), |
| 1008 | " SAR: 0x%x DAR: 0x%x LLP: 0x%x CTL: 0x%x:%08x\n", |
| 1009 | channel_readl(dwc, SAR), |
| 1010 | channel_readl(dwc, DAR), |
| 1011 | channel_readl(dwc, LLP), |
| 1012 | channel_readl(dwc, CTL_HI), |
| 1013 | channel_readl(dwc, CTL_LO)); |
| 1014 | spin_unlock(&dwc->lock); |
| 1015 | return -EBUSY; |
| 1016 | } |
| 1017 | |
| 1018 | dma_writel(dw, CLEAR.BLOCK, dwc->mask); |
| 1019 | dma_writel(dw, CLEAR.ERROR, dwc->mask); |
| 1020 | dma_writel(dw, CLEAR.XFER, dwc->mask); |
| 1021 | |
| 1022 | /* setup DMAC channel registers */ |
| 1023 | channel_writel(dwc, LLP, dwc->cdesc->desc[0]->txd.phys); |
| 1024 | channel_writel(dwc, CTL_LO, DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN); |
| 1025 | channel_writel(dwc, CTL_HI, 0); |
| 1026 | |
| 1027 | channel_set_bit(dw, CH_EN, dwc->mask); |
| 1028 | |
| 1029 | spin_unlock(&dwc->lock); |
| 1030 | |
| 1031 | return 0; |
| 1032 | } |
| 1033 | EXPORT_SYMBOL(dw_dma_cyclic_start); |
| 1034 | |
| 1035 | /** |
| 1036 | * dw_dma_cyclic_stop - stop the cyclic DMA transfer |
| 1037 | * @chan: the DMA channel to stop |
| 1038 | * |
| 1039 | * Must be called with soft interrupts disabled. |
| 1040 | */ |
| 1041 | void dw_dma_cyclic_stop(struct dma_chan *chan) |
| 1042 | { |
| 1043 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); |
| 1044 | struct dw_dma *dw = to_dw_dma(dwc->chan.device); |
| 1045 | |
| 1046 | spin_lock(&dwc->lock); |
| 1047 | |
| 1048 | channel_clear_bit(dw, CH_EN, dwc->mask); |
| 1049 | while (dma_readl(dw, CH_EN) & dwc->mask) |
| 1050 | cpu_relax(); |
| 1051 | |
| 1052 | spin_unlock(&dwc->lock); |
| 1053 | } |
| 1054 | EXPORT_SYMBOL(dw_dma_cyclic_stop); |
| 1055 | |
| 1056 | /** |
| 1057 | * dw_dma_cyclic_prep - prepare the cyclic DMA transfer |
| 1058 | * @chan: the DMA channel to prepare |
| 1059 | * @buf_addr: physical DMA address where the buffer starts |
| 1060 | * @buf_len: total number of bytes for the entire buffer |
| 1061 | * @period_len: number of bytes for each period |
| 1062 | * @direction: transfer direction, to or from device |
| 1063 | * |
| 1064 | * Must be called before trying to start the transfer. Returns a valid struct |
| 1065 | * dw_cyclic_desc if successful or an ERR_PTR(-errno) if not successful. |
| 1066 | */ |
| 1067 | struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan, |
| 1068 | dma_addr_t buf_addr, size_t buf_len, size_t period_len, |
| 1069 | enum dma_data_direction direction) |
| 1070 | { |
| 1071 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); |
| 1072 | struct dw_cyclic_desc *cdesc; |
| 1073 | struct dw_cyclic_desc *retval = NULL; |
| 1074 | struct dw_desc *desc; |
| 1075 | struct dw_desc *last = NULL; |
| 1076 | struct dw_dma_slave *dws = chan->private; |
| 1077 | unsigned long was_cyclic; |
| 1078 | unsigned int reg_width; |
| 1079 | unsigned int periods; |
| 1080 | unsigned int i; |
| 1081 | |
| 1082 | spin_lock_bh(&dwc->lock); |
| 1083 | if (!list_empty(&dwc->queue) || !list_empty(&dwc->active_list)) { |
| 1084 | spin_unlock_bh(&dwc->lock); |
| 1085 | dev_dbg(chan2dev(&dwc->chan), |
| 1086 | "queue and/or active list are not empty\n"); |
| 1087 | return ERR_PTR(-EBUSY); |
| 1088 | } |
| 1089 | |
| 1090 | was_cyclic = test_and_set_bit(DW_DMA_IS_CYCLIC, &dwc->flags); |
| 1091 | spin_unlock_bh(&dwc->lock); |
| 1092 | if (was_cyclic) { |
| 1093 | dev_dbg(chan2dev(&dwc->chan), |
| 1094 | "channel already prepared for cyclic DMA\n"); |
| 1095 | return ERR_PTR(-EBUSY); |
| 1096 | } |
| 1097 | |
| 1098 | retval = ERR_PTR(-EINVAL); |
| 1099 | reg_width = dws->reg_width; |
| 1100 | periods = buf_len / period_len; |
| 1101 | |
| 1102 | /* Check for too big/unaligned periods and unaligned DMA buffer. */ |
| 1103 | if (period_len > (DWC_MAX_COUNT << reg_width)) |
| 1104 | goto out_err; |
| 1105 | if (unlikely(period_len & ((1 << reg_width) - 1))) |
| 1106 | goto out_err; |
| 1107 | if (unlikely(buf_addr & ((1 << reg_width) - 1))) |
| 1108 | goto out_err; |
| 1109 | if (unlikely(!(direction & (DMA_TO_DEVICE | DMA_FROM_DEVICE)))) |
| 1110 | goto out_err; |
| 1111 | |
| 1112 | retval = ERR_PTR(-ENOMEM); |
| 1113 | |
| 1114 | if (periods > NR_DESCS_PER_CHANNEL) |
| 1115 | goto out_err; |
| 1116 | |
| 1117 | cdesc = kzalloc(sizeof(struct dw_cyclic_desc), GFP_KERNEL); |
| 1118 | if (!cdesc) |
| 1119 | goto out_err; |
| 1120 | |
| 1121 | cdesc->desc = kzalloc(sizeof(struct dw_desc *) * periods, GFP_KERNEL); |
| 1122 | if (!cdesc->desc) |
| 1123 | goto out_err_alloc; |
| 1124 | |
| 1125 | for (i = 0; i < periods; i++) { |
| 1126 | desc = dwc_desc_get(dwc); |
| 1127 | if (!desc) |
| 1128 | goto out_err_desc_get; |
| 1129 | |
| 1130 | switch (direction) { |
| 1131 | case DMA_TO_DEVICE: |
| 1132 | desc->lli.dar = dws->tx_reg; |
| 1133 | desc->lli.sar = buf_addr + (period_len * i); |
Jamie Iles | f301c06 | 2011-01-21 14:11:53 +0000 | [diff] [blame] | 1134 | desc->lli.ctllo = (DWC_DEFAULT_CTLLO(chan->private) |
Hans-Christian Egtvedt | d9de451 | 2009-04-01 15:47:02 +0200 | [diff] [blame] | 1135 | | DWC_CTLL_DST_WIDTH(reg_width) |
| 1136 | | DWC_CTLL_SRC_WIDTH(reg_width) |
| 1137 | | DWC_CTLL_DST_FIX |
| 1138 | | DWC_CTLL_SRC_INC |
| 1139 | | DWC_CTLL_FC_M2P |
| 1140 | | DWC_CTLL_INT_EN); |
| 1141 | break; |
| 1142 | case DMA_FROM_DEVICE: |
| 1143 | desc->lli.dar = buf_addr + (period_len * i); |
| 1144 | desc->lli.sar = dws->rx_reg; |
Jamie Iles | f301c06 | 2011-01-21 14:11:53 +0000 | [diff] [blame] | 1145 | desc->lli.ctllo = (DWC_DEFAULT_CTLLO(chan->private) |
Hans-Christian Egtvedt | d9de451 | 2009-04-01 15:47:02 +0200 | [diff] [blame] | 1146 | | DWC_CTLL_SRC_WIDTH(reg_width) |
| 1147 | | DWC_CTLL_DST_WIDTH(reg_width) |
| 1148 | | DWC_CTLL_DST_INC |
| 1149 | | DWC_CTLL_SRC_FIX |
| 1150 | | DWC_CTLL_FC_P2M |
| 1151 | | DWC_CTLL_INT_EN); |
| 1152 | break; |
| 1153 | default: |
| 1154 | break; |
| 1155 | } |
| 1156 | |
| 1157 | desc->lli.ctlhi = (period_len >> reg_width); |
| 1158 | cdesc->desc[i] = desc; |
| 1159 | |
| 1160 | if (last) { |
| 1161 | last->lli.llp = desc->txd.phys; |
| 1162 | dma_sync_single_for_device(chan2parent(chan), |
| 1163 | last->txd.phys, sizeof(last->lli), |
| 1164 | DMA_TO_DEVICE); |
| 1165 | } |
| 1166 | |
| 1167 | last = desc; |
| 1168 | } |
| 1169 | |
| 1170 | /* lets make a cyclic list */ |
| 1171 | last->lli.llp = cdesc->desc[0]->txd.phys; |
| 1172 | dma_sync_single_for_device(chan2parent(chan), last->txd.phys, |
| 1173 | sizeof(last->lli), DMA_TO_DEVICE); |
| 1174 | |
| 1175 | dev_dbg(chan2dev(&dwc->chan), "cyclic prepared buf 0x%08x len %zu " |
| 1176 | "period %zu periods %d\n", buf_addr, buf_len, |
| 1177 | period_len, periods); |
| 1178 | |
| 1179 | cdesc->periods = periods; |
| 1180 | dwc->cdesc = cdesc; |
| 1181 | |
| 1182 | return cdesc; |
| 1183 | |
| 1184 | out_err_desc_get: |
| 1185 | while (i--) |
| 1186 | dwc_desc_put(dwc, cdesc->desc[i]); |
| 1187 | out_err_alloc: |
| 1188 | kfree(cdesc); |
| 1189 | out_err: |
| 1190 | clear_bit(DW_DMA_IS_CYCLIC, &dwc->flags); |
| 1191 | return (struct dw_cyclic_desc *)retval; |
| 1192 | } |
| 1193 | EXPORT_SYMBOL(dw_dma_cyclic_prep); |
| 1194 | |
| 1195 | /** |
| 1196 | * dw_dma_cyclic_free - free a prepared cyclic DMA transfer |
| 1197 | * @chan: the DMA channel to free |
| 1198 | */ |
| 1199 | void dw_dma_cyclic_free(struct dma_chan *chan) |
| 1200 | { |
| 1201 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); |
| 1202 | struct dw_dma *dw = to_dw_dma(dwc->chan.device); |
| 1203 | struct dw_cyclic_desc *cdesc = dwc->cdesc; |
| 1204 | int i; |
| 1205 | |
| 1206 | dev_dbg(chan2dev(&dwc->chan), "cyclic free\n"); |
| 1207 | |
| 1208 | if (!cdesc) |
| 1209 | return; |
| 1210 | |
| 1211 | spin_lock_bh(&dwc->lock); |
| 1212 | |
| 1213 | channel_clear_bit(dw, CH_EN, dwc->mask); |
| 1214 | while (dma_readl(dw, CH_EN) & dwc->mask) |
| 1215 | cpu_relax(); |
| 1216 | |
| 1217 | dma_writel(dw, CLEAR.BLOCK, dwc->mask); |
| 1218 | dma_writel(dw, CLEAR.ERROR, dwc->mask); |
| 1219 | dma_writel(dw, CLEAR.XFER, dwc->mask); |
| 1220 | |
| 1221 | spin_unlock_bh(&dwc->lock); |
| 1222 | |
| 1223 | for (i = 0; i < cdesc->periods; i++) |
| 1224 | dwc_desc_put(dwc, cdesc->desc[i]); |
| 1225 | |
| 1226 | kfree(cdesc->desc); |
| 1227 | kfree(cdesc); |
| 1228 | |
| 1229 | clear_bit(DW_DMA_IS_CYCLIC, &dwc->flags); |
| 1230 | } |
| 1231 | EXPORT_SYMBOL(dw_dma_cyclic_free); |
| 1232 | |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 1233 | /*----------------------------------------------------------------------*/ |
| 1234 | |
| 1235 | static void dw_dma_off(struct dw_dma *dw) |
| 1236 | { |
| 1237 | dma_writel(dw, CFG, 0); |
| 1238 | |
| 1239 | channel_clear_bit(dw, MASK.XFER, dw->all_chan_mask); |
| 1240 | channel_clear_bit(dw, MASK.BLOCK, dw->all_chan_mask); |
| 1241 | channel_clear_bit(dw, MASK.SRC_TRAN, dw->all_chan_mask); |
| 1242 | channel_clear_bit(dw, MASK.DST_TRAN, dw->all_chan_mask); |
| 1243 | channel_clear_bit(dw, MASK.ERROR, dw->all_chan_mask); |
| 1244 | |
| 1245 | while (dma_readl(dw, CFG) & DW_CFG_DMA_EN) |
| 1246 | cpu_relax(); |
| 1247 | } |
| 1248 | |
| 1249 | static int __init dw_probe(struct platform_device *pdev) |
| 1250 | { |
| 1251 | struct dw_dma_platform_data *pdata; |
| 1252 | struct resource *io; |
| 1253 | struct dw_dma *dw; |
| 1254 | size_t size; |
| 1255 | int irq; |
| 1256 | int err; |
| 1257 | int i; |
| 1258 | |
| 1259 | pdata = pdev->dev.platform_data; |
| 1260 | if (!pdata || pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS) |
| 1261 | return -EINVAL; |
| 1262 | |
| 1263 | io = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 1264 | if (!io) |
| 1265 | return -EINVAL; |
| 1266 | |
| 1267 | irq = platform_get_irq(pdev, 0); |
| 1268 | if (irq < 0) |
| 1269 | return irq; |
| 1270 | |
| 1271 | size = sizeof(struct dw_dma); |
| 1272 | size += pdata->nr_channels * sizeof(struct dw_dma_chan); |
| 1273 | dw = kzalloc(size, GFP_KERNEL); |
| 1274 | if (!dw) |
| 1275 | return -ENOMEM; |
| 1276 | |
| 1277 | if (!request_mem_region(io->start, DW_REGLEN, pdev->dev.driver->name)) { |
| 1278 | err = -EBUSY; |
| 1279 | goto err_kfree; |
| 1280 | } |
| 1281 | |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 1282 | dw->regs = ioremap(io->start, DW_REGLEN); |
| 1283 | if (!dw->regs) { |
| 1284 | err = -ENOMEM; |
| 1285 | goto err_release_r; |
| 1286 | } |
| 1287 | |
| 1288 | dw->clk = clk_get(&pdev->dev, "hclk"); |
| 1289 | if (IS_ERR(dw->clk)) { |
| 1290 | err = PTR_ERR(dw->clk); |
| 1291 | goto err_clk; |
| 1292 | } |
| 1293 | clk_enable(dw->clk); |
| 1294 | |
| 1295 | /* force dma off, just in case */ |
| 1296 | dw_dma_off(dw); |
| 1297 | |
| 1298 | err = request_irq(irq, dw_dma_interrupt, 0, "dw_dmac", dw); |
| 1299 | if (err) |
| 1300 | goto err_irq; |
| 1301 | |
| 1302 | platform_set_drvdata(pdev, dw); |
| 1303 | |
| 1304 | tasklet_init(&dw->tasklet, dw_dma_tasklet, (unsigned long)dw); |
| 1305 | |
| 1306 | dw->all_chan_mask = (1 << pdata->nr_channels) - 1; |
| 1307 | |
| 1308 | INIT_LIST_HEAD(&dw->dma.channels); |
| 1309 | for (i = 0; i < pdata->nr_channels; i++, dw->dma.chancnt++) { |
| 1310 | struct dw_dma_chan *dwc = &dw->chan[i]; |
| 1311 | |
| 1312 | dwc->chan.device = &dw->dma; |
| 1313 | dwc->chan.cookie = dwc->completed = 1; |
| 1314 | dwc->chan.chan_id = i; |
| 1315 | list_add_tail(&dwc->chan.device_node, &dw->dma.channels); |
| 1316 | |
| 1317 | dwc->ch_regs = &__dw_regs(dw)->CHAN[i]; |
| 1318 | spin_lock_init(&dwc->lock); |
| 1319 | dwc->mask = 1 << i; |
| 1320 | |
| 1321 | INIT_LIST_HEAD(&dwc->active_list); |
| 1322 | INIT_LIST_HEAD(&dwc->queue); |
| 1323 | INIT_LIST_HEAD(&dwc->free_list); |
| 1324 | |
| 1325 | channel_clear_bit(dw, CH_EN, dwc->mask); |
| 1326 | } |
| 1327 | |
| 1328 | /* Clear/disable all interrupts on all channels. */ |
| 1329 | dma_writel(dw, CLEAR.XFER, dw->all_chan_mask); |
| 1330 | dma_writel(dw, CLEAR.BLOCK, dw->all_chan_mask); |
| 1331 | dma_writel(dw, CLEAR.SRC_TRAN, dw->all_chan_mask); |
| 1332 | dma_writel(dw, CLEAR.DST_TRAN, dw->all_chan_mask); |
| 1333 | dma_writel(dw, CLEAR.ERROR, dw->all_chan_mask); |
| 1334 | |
| 1335 | channel_clear_bit(dw, MASK.XFER, dw->all_chan_mask); |
| 1336 | channel_clear_bit(dw, MASK.BLOCK, dw->all_chan_mask); |
| 1337 | channel_clear_bit(dw, MASK.SRC_TRAN, dw->all_chan_mask); |
| 1338 | channel_clear_bit(dw, MASK.DST_TRAN, dw->all_chan_mask); |
| 1339 | channel_clear_bit(dw, MASK.ERROR, dw->all_chan_mask); |
| 1340 | |
| 1341 | dma_cap_set(DMA_MEMCPY, dw->dma.cap_mask); |
| 1342 | dma_cap_set(DMA_SLAVE, dw->dma.cap_mask); |
Jamie Iles | 95ea759 | 2011-01-21 14:11:54 +0000 | [diff] [blame] | 1343 | if (pdata->is_private) |
| 1344 | dma_cap_set(DMA_PRIVATE, dw->dma.cap_mask); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 1345 | dw->dma.dev = &pdev->dev; |
| 1346 | dw->dma.device_alloc_chan_resources = dwc_alloc_chan_resources; |
| 1347 | dw->dma.device_free_chan_resources = dwc_free_chan_resources; |
| 1348 | |
| 1349 | dw->dma.device_prep_dma_memcpy = dwc_prep_dma_memcpy; |
| 1350 | |
| 1351 | dw->dma.device_prep_slave_sg = dwc_prep_slave_sg; |
Linus Walleij | c3635c7 | 2010-03-26 16:44:01 -0700 | [diff] [blame] | 1352 | dw->dma.device_control = dwc_control; |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 1353 | |
Linus Walleij | 0793448 | 2010-03-26 16:50:49 -0700 | [diff] [blame] | 1354 | dw->dma.device_tx_status = dwc_tx_status; |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 1355 | dw->dma.device_issue_pending = dwc_issue_pending; |
| 1356 | |
| 1357 | dma_writel(dw, CFG, DW_CFG_DMA_EN); |
| 1358 | |
| 1359 | printk(KERN_INFO "%s: DesignWare DMA Controller, %d channels\n", |
Kay Sievers | dfbc901 | 2009-03-24 16:38:22 -0700 | [diff] [blame] | 1360 | dev_name(&pdev->dev), dw->dma.chancnt); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 1361 | |
| 1362 | dma_async_device_register(&dw->dma); |
| 1363 | |
| 1364 | return 0; |
| 1365 | |
| 1366 | err_irq: |
| 1367 | clk_disable(dw->clk); |
| 1368 | clk_put(dw->clk); |
| 1369 | err_clk: |
| 1370 | iounmap(dw->regs); |
| 1371 | dw->regs = NULL; |
| 1372 | err_release_r: |
| 1373 | release_resource(io); |
| 1374 | err_kfree: |
| 1375 | kfree(dw); |
| 1376 | return err; |
| 1377 | } |
| 1378 | |
| 1379 | static int __exit dw_remove(struct platform_device *pdev) |
| 1380 | { |
| 1381 | struct dw_dma *dw = platform_get_drvdata(pdev); |
| 1382 | struct dw_dma_chan *dwc, *_dwc; |
| 1383 | struct resource *io; |
| 1384 | |
| 1385 | dw_dma_off(dw); |
| 1386 | dma_async_device_unregister(&dw->dma); |
| 1387 | |
| 1388 | free_irq(platform_get_irq(pdev, 0), dw); |
| 1389 | tasklet_kill(&dw->tasklet); |
| 1390 | |
| 1391 | list_for_each_entry_safe(dwc, _dwc, &dw->dma.channels, |
| 1392 | chan.device_node) { |
| 1393 | list_del(&dwc->chan.device_node); |
| 1394 | channel_clear_bit(dw, CH_EN, dwc->mask); |
| 1395 | } |
| 1396 | |
| 1397 | clk_disable(dw->clk); |
| 1398 | clk_put(dw->clk); |
| 1399 | |
| 1400 | iounmap(dw->regs); |
| 1401 | dw->regs = NULL; |
| 1402 | |
| 1403 | io = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 1404 | release_mem_region(io->start, DW_REGLEN); |
| 1405 | |
| 1406 | kfree(dw); |
| 1407 | |
| 1408 | return 0; |
| 1409 | } |
| 1410 | |
| 1411 | static void dw_shutdown(struct platform_device *pdev) |
| 1412 | { |
| 1413 | struct dw_dma *dw = platform_get_drvdata(pdev); |
| 1414 | |
| 1415 | dw_dma_off(platform_get_drvdata(pdev)); |
| 1416 | clk_disable(dw->clk); |
| 1417 | } |
| 1418 | |
Magnus Damm | 4a256b5 | 2009-07-08 13:22:18 +0200 | [diff] [blame] | 1419 | static int dw_suspend_noirq(struct device *dev) |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 1420 | { |
Magnus Damm | 4a256b5 | 2009-07-08 13:22:18 +0200 | [diff] [blame] | 1421 | struct platform_device *pdev = to_platform_device(dev); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 1422 | struct dw_dma *dw = platform_get_drvdata(pdev); |
| 1423 | |
| 1424 | dw_dma_off(platform_get_drvdata(pdev)); |
| 1425 | clk_disable(dw->clk); |
| 1426 | return 0; |
| 1427 | } |
| 1428 | |
Magnus Damm | 4a256b5 | 2009-07-08 13:22:18 +0200 | [diff] [blame] | 1429 | static int dw_resume_noirq(struct device *dev) |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 1430 | { |
Magnus Damm | 4a256b5 | 2009-07-08 13:22:18 +0200 | [diff] [blame] | 1431 | struct platform_device *pdev = to_platform_device(dev); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 1432 | struct dw_dma *dw = platform_get_drvdata(pdev); |
| 1433 | |
| 1434 | clk_enable(dw->clk); |
| 1435 | dma_writel(dw, CFG, DW_CFG_DMA_EN); |
| 1436 | return 0; |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 1437 | } |
| 1438 | |
Alexey Dobriyan | 4714521 | 2009-12-14 18:00:08 -0800 | [diff] [blame] | 1439 | static const struct dev_pm_ops dw_dev_pm_ops = { |
Magnus Damm | 4a256b5 | 2009-07-08 13:22:18 +0200 | [diff] [blame] | 1440 | .suspend_noirq = dw_suspend_noirq, |
| 1441 | .resume_noirq = dw_resume_noirq, |
| 1442 | }; |
| 1443 | |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 1444 | static struct platform_driver dw_driver = { |
| 1445 | .remove = __exit_p(dw_remove), |
| 1446 | .shutdown = dw_shutdown, |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 1447 | .driver = { |
| 1448 | .name = "dw_dmac", |
Magnus Damm | 4a256b5 | 2009-07-08 13:22:18 +0200 | [diff] [blame] | 1449 | .pm = &dw_dev_pm_ops, |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 1450 | }, |
| 1451 | }; |
| 1452 | |
| 1453 | static int __init dw_init(void) |
| 1454 | { |
| 1455 | return platform_driver_probe(&dw_driver, dw_probe); |
| 1456 | } |
Viresh Kumar | cb689a7 | 2011-03-03 15:47:15 +0530 | [diff] [blame] | 1457 | subsys_initcall(dw_init); |
Haavard Skinnemoen | 3bfb1d2 | 2008-07-08 11:59:42 -0700 | [diff] [blame] | 1458 | |
| 1459 | static void __exit dw_exit(void) |
| 1460 | { |
| 1461 | platform_driver_unregister(&dw_driver); |
| 1462 | } |
| 1463 | module_exit(dw_exit); |
| 1464 | |
| 1465 | MODULE_LICENSE("GPL v2"); |
| 1466 | MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller driver"); |
| 1467 | MODULE_AUTHOR("Haavard Skinnemoen <haavard.skinnemoen@atmel.com>"); |