Commit | Line | Data |
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ef8c2dab CC |
1 | /* |
2 | * Texas Instruments CPDMA Driver | |
3 | * | |
4 | * Copyright (C) 2010 Texas Instruments | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License as | |
8 | * published by the Free Software Foundation version 2. | |
9 | * | |
10 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
11 | * kind, whether express or implied; without even the implied warranty | |
12 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | */ | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/spinlock.h> | |
17 | #include <linux/device.h> | |
76fbc247 | 18 | #include <linux/module.h> |
ef8c2dab CC |
19 | #include <linux/slab.h> |
20 | #include <linux/err.h> | |
21 | #include <linux/dma-mapping.h> | |
22 | #include <linux/io.h> | |
817f6d1a | 23 | #include <linux/delay.h> |
742fb20f | 24 | #include <linux/genalloc.h> |
ef8c2dab CC |
25 | #include "davinci_cpdma.h" |
26 | ||
27 | /* DMA Registers */ | |
28 | #define CPDMA_TXIDVER 0x00 | |
29 | #define CPDMA_TXCONTROL 0x04 | |
30 | #define CPDMA_TXTEARDOWN 0x08 | |
31 | #define CPDMA_RXIDVER 0x10 | |
32 | #define CPDMA_RXCONTROL 0x14 | |
33 | #define CPDMA_SOFTRESET 0x1c | |
34 | #define CPDMA_RXTEARDOWN 0x18 | |
35 | #define CPDMA_TXINTSTATRAW 0x80 | |
36 | #define CPDMA_TXINTSTATMASKED 0x84 | |
37 | #define CPDMA_TXINTMASKSET 0x88 | |
38 | #define CPDMA_TXINTMASKCLEAR 0x8c | |
39 | #define CPDMA_MACINVECTOR 0x90 | |
40 | #define CPDMA_MACEOIVECTOR 0x94 | |
41 | #define CPDMA_RXINTSTATRAW 0xa0 | |
42 | #define CPDMA_RXINTSTATMASKED 0xa4 | |
43 | #define CPDMA_RXINTMASKSET 0xa8 | |
44 | #define CPDMA_RXINTMASKCLEAR 0xac | |
45 | #define CPDMA_DMAINTSTATRAW 0xb0 | |
46 | #define CPDMA_DMAINTSTATMASKED 0xb4 | |
47 | #define CPDMA_DMAINTMASKSET 0xb8 | |
48 | #define CPDMA_DMAINTMASKCLEAR 0xbc | |
49 | #define CPDMA_DMAINT_HOSTERR BIT(1) | |
50 | ||
51 | /* the following exist only if has_ext_regs is set */ | |
52 | #define CPDMA_DMACONTROL 0x20 | |
53 | #define CPDMA_DMASTATUS 0x24 | |
54 | #define CPDMA_RXBUFFOFS 0x28 | |
55 | #define CPDMA_EM_CONTROL 0x2c | |
56 | ||
57 | /* Descriptor mode bits */ | |
58 | #define CPDMA_DESC_SOP BIT(31) | |
59 | #define CPDMA_DESC_EOP BIT(30) | |
60 | #define CPDMA_DESC_OWNER BIT(29) | |
61 | #define CPDMA_DESC_EOQ BIT(28) | |
62 | #define CPDMA_DESC_TD_COMPLETE BIT(27) | |
63 | #define CPDMA_DESC_PASS_CRC BIT(26) | |
f6e135c8 M |
64 | #define CPDMA_DESC_TO_PORT_EN BIT(20) |
65 | #define CPDMA_TO_PORT_SHIFT 16 | |
66 | #define CPDMA_DESC_PORT_MASK (BIT(18) | BIT(17) | BIT(16)) | |
28a19fe6 | 67 | #define CPDMA_DESC_CRC_LEN 4 |
ef8c2dab CC |
68 | |
69 | #define CPDMA_TEARDOWN_VALUE 0xfffffffc | |
70 | ||
71 | struct cpdma_desc { | |
72 | /* hardware fields */ | |
73 | u32 hw_next; | |
74 | u32 hw_buffer; | |
75 | u32 hw_len; | |
76 | u32 hw_mode; | |
77 | /* software fields */ | |
78 | void *sw_token; | |
79 | u32 sw_buffer; | |
80 | u32 sw_len; | |
81 | }; | |
82 | ||
83 | struct cpdma_desc_pool { | |
c767db51 | 84 | phys_addr_t phys; |
84092996 | 85 | dma_addr_t hw_addr; |
ef8c2dab CC |
86 | void __iomem *iomap; /* ioremap map */ |
87 | void *cpumap; /* dma_alloc map */ | |
88 | int desc_size, mem_size; | |
89 | int num_desc, used_desc; | |
ef8c2dab | 90 | struct device *dev; |
742fb20f | 91 | struct gen_pool *gen_pool; |
ef8c2dab CC |
92 | }; |
93 | ||
94 | enum cpdma_state { | |
95 | CPDMA_STATE_IDLE, | |
96 | CPDMA_STATE_ACTIVE, | |
97 | CPDMA_STATE_TEARDOWN, | |
98 | }; | |
99 | ||
ef8c2dab CC |
100 | struct cpdma_ctlr { |
101 | enum cpdma_state state; | |
102 | struct cpdma_params params; | |
103 | struct device *dev; | |
104 | struct cpdma_desc_pool *pool; | |
105 | spinlock_t lock; | |
106 | struct cpdma_chan *channels[2 * CPDMA_MAX_CHANNELS]; | |
107 | }; | |
108 | ||
109 | struct cpdma_chan { | |
fae50823 M |
110 | struct cpdma_desc __iomem *head, *tail; |
111 | void __iomem *hdp, *cp, *rxfree; | |
ef8c2dab CC |
112 | enum cpdma_state state; |
113 | struct cpdma_ctlr *ctlr; | |
114 | int chan_num; | |
115 | spinlock_t lock; | |
ef8c2dab | 116 | int count; |
742fb20f | 117 | u32 desc_num; |
ef8c2dab CC |
118 | u32 mask; |
119 | cpdma_handler_fn handler; | |
120 | enum dma_data_direction dir; | |
121 | struct cpdma_chan_stats stats; | |
122 | /* offsets into dmaregs */ | |
123 | int int_set, int_clear, td; | |
124 | }; | |
125 | ||
126 | /* The following make access to common cpdma_ctlr params more readable */ | |
127 | #define dmaregs params.dmaregs | |
128 | #define num_chan params.num_chan | |
129 | ||
130 | /* various accessors */ | |
131 | #define dma_reg_read(ctlr, ofs) __raw_readl((ctlr)->dmaregs + (ofs)) | |
132 | #define chan_read(chan, fld) __raw_readl((chan)->fld) | |
133 | #define desc_read(desc, fld) __raw_readl(&(desc)->fld) | |
134 | #define dma_reg_write(ctlr, ofs, v) __raw_writel(v, (ctlr)->dmaregs + (ofs)) | |
135 | #define chan_write(chan, fld, v) __raw_writel(v, (chan)->fld) | |
136 | #define desc_write(desc, fld, v) __raw_writel((u32)(v), &(desc)->fld) | |
137 | ||
f6e135c8 M |
138 | #define cpdma_desc_to_port(chan, mode, directed) \ |
139 | do { \ | |
140 | if (!is_rx_chan(chan) && ((directed == 1) || \ | |
141 | (directed == 2))) \ | |
142 | mode |= (CPDMA_DESC_TO_PORT_EN | \ | |
143 | (directed << CPDMA_TO_PORT_SHIFT)); \ | |
144 | } while (0) | |
145 | ||
742fb20f GS |
146 | static void cpdma_desc_pool_destroy(struct cpdma_desc_pool *pool) |
147 | { | |
148 | if (!pool) | |
149 | return; | |
150 | ||
151 | WARN_ON(pool->used_desc); | |
152 | if (pool->cpumap) | |
153 | dma_free_coherent(pool->dev, pool->mem_size, pool->cpumap, | |
154 | pool->phys); | |
155 | else | |
156 | iounmap(pool->iomap); | |
157 | } | |
158 | ||
ef8c2dab CC |
159 | /* |
160 | * Utility constructs for a cpdma descriptor pool. Some devices (e.g. davinci | |
161 | * emac) have dedicated on-chip memory for these descriptors. Some other | |
162 | * devices (e.g. cpsw switches) use plain old memory. Descriptor pools | |
163 | * abstract out these details | |
164 | */ | |
165 | static struct cpdma_desc_pool * | |
84092996 | 166 | cpdma_desc_pool_create(struct device *dev, u32 phys, dma_addr_t hw_addr, |
6a1fef6d | 167 | int size, int align) |
ef8c2dab | 168 | { |
ef8c2dab | 169 | struct cpdma_desc_pool *pool; |
742fb20f | 170 | int ret; |
ef8c2dab | 171 | |
e1943128 | 172 | pool = devm_kzalloc(dev, sizeof(*pool), GFP_KERNEL); |
ef8c2dab | 173 | if (!pool) |
742fb20f | 174 | goto gen_pool_create_fail; |
ef8c2dab CC |
175 | |
176 | pool->dev = dev; | |
177 | pool->mem_size = size; | |
178 | pool->desc_size = ALIGN(sizeof(struct cpdma_desc), align); | |
179 | pool->num_desc = size / pool->desc_size; | |
180 | ||
742fb20f GS |
181 | pool->gen_pool = devm_gen_pool_create(dev, ilog2(pool->desc_size), -1, |
182 | "cpdma"); | |
183 | if (IS_ERR(pool->gen_pool)) { | |
184 | dev_err(dev, "pool create failed %ld\n", | |
185 | PTR_ERR(pool->gen_pool)); | |
186 | goto gen_pool_create_fail; | |
187 | } | |
ef8c2dab CC |
188 | |
189 | if (phys) { | |
190 | pool->phys = phys; | |
84092996 | 191 | pool->iomap = ioremap(phys, size); /* should be memremap? */ |
6a1fef6d | 192 | pool->hw_addr = hw_addr; |
ef8c2dab | 193 | } else { |
84092996 | 194 | pool->cpumap = dma_alloc_coherent(dev, size, &pool->hw_addr, |
ef8c2dab | 195 | GFP_KERNEL); |
84092996 AB |
196 | pool->iomap = (void __iomem __force *)pool->cpumap; |
197 | pool->phys = pool->hw_addr; /* assumes no IOMMU, don't use this value */ | |
ef8c2dab CC |
198 | } |
199 | ||
742fb20f GS |
200 | if (!pool->iomap) |
201 | goto gen_pool_create_fail; | |
ef8c2dab | 202 | |
742fb20f GS |
203 | ret = gen_pool_add_virt(pool->gen_pool, (unsigned long)pool->iomap, |
204 | pool->phys, pool->mem_size, -1); | |
205 | if (ret < 0) { | |
206 | dev_err(dev, "pool add failed %d\n", ret); | |
207 | goto gen_pool_add_virt_fail; | |
ef8c2dab | 208 | } |
742fb20f GS |
209 | |
210 | return pool; | |
211 | ||
212 | gen_pool_add_virt_fail: | |
213 | cpdma_desc_pool_destroy(pool); | |
214 | gen_pool_create_fail: | |
215 | return NULL; | |
ef8c2dab CC |
216 | } |
217 | ||
218 | static inline dma_addr_t desc_phys(struct cpdma_desc_pool *pool, | |
219 | struct cpdma_desc __iomem *desc) | |
220 | { | |
221 | if (!desc) | |
222 | return 0; | |
c767db51 | 223 | return pool->hw_addr + (__force long)desc - (__force long)pool->iomap; |
ef8c2dab CC |
224 | } |
225 | ||
226 | static inline struct cpdma_desc __iomem * | |
227 | desc_from_phys(struct cpdma_desc_pool *pool, dma_addr_t dma) | |
228 | { | |
6a1fef6d | 229 | return dma ? pool->iomap + dma - pool->hw_addr : NULL; |
ef8c2dab CC |
230 | } |
231 | ||
232 | static struct cpdma_desc __iomem * | |
742fb20f | 233 | cpdma_desc_alloc(struct cpdma_desc_pool *pool) |
ef8c2dab | 234 | { |
ef8c2dab CC |
235 | struct cpdma_desc __iomem *desc = NULL; |
236 | ||
742fb20f GS |
237 | desc = (struct cpdma_desc __iomem *)gen_pool_alloc(pool->gen_pool, |
238 | pool->desc_size); | |
239 | if (desc) | |
ef8c2dab | 240 | pool->used_desc++; |
ef8c2dab | 241 | |
ef8c2dab CC |
242 | return desc; |
243 | } | |
244 | ||
245 | static void cpdma_desc_free(struct cpdma_desc_pool *pool, | |
246 | struct cpdma_desc __iomem *desc, int num_desc) | |
247 | { | |
742fb20f | 248 | gen_pool_free(pool->gen_pool, (unsigned long)desc, pool->desc_size); |
ef8c2dab | 249 | pool->used_desc--; |
ef8c2dab CC |
250 | } |
251 | ||
252 | struct cpdma_ctlr *cpdma_ctlr_create(struct cpdma_params *params) | |
253 | { | |
254 | struct cpdma_ctlr *ctlr; | |
255 | ||
e1943128 | 256 | ctlr = devm_kzalloc(params->dev, sizeof(*ctlr), GFP_KERNEL); |
ef8c2dab CC |
257 | if (!ctlr) |
258 | return NULL; | |
259 | ||
260 | ctlr->state = CPDMA_STATE_IDLE; | |
261 | ctlr->params = *params; | |
262 | ctlr->dev = params->dev; | |
263 | spin_lock_init(&ctlr->lock); | |
264 | ||
265 | ctlr->pool = cpdma_desc_pool_create(ctlr->dev, | |
266 | ctlr->params.desc_mem_phys, | |
6a1fef6d | 267 | ctlr->params.desc_hw_addr, |
ef8c2dab CC |
268 | ctlr->params.desc_mem_size, |
269 | ctlr->params.desc_align); | |
2f87208e | 270 | if (!ctlr->pool) |
ef8c2dab | 271 | return NULL; |
ef8c2dab CC |
272 | |
273 | if (WARN_ON(ctlr->num_chan > CPDMA_MAX_CHANNELS)) | |
274 | ctlr->num_chan = CPDMA_MAX_CHANNELS; | |
275 | return ctlr; | |
276 | } | |
32a6d90b | 277 | EXPORT_SYMBOL_GPL(cpdma_ctlr_create); |
ef8c2dab CC |
278 | |
279 | int cpdma_ctlr_start(struct cpdma_ctlr *ctlr) | |
280 | { | |
281 | unsigned long flags; | |
282 | int i; | |
283 | ||
284 | spin_lock_irqsave(&ctlr->lock, flags); | |
285 | if (ctlr->state != CPDMA_STATE_IDLE) { | |
286 | spin_unlock_irqrestore(&ctlr->lock, flags); | |
287 | return -EBUSY; | |
288 | } | |
289 | ||
290 | if (ctlr->params.has_soft_reset) { | |
817f6d1a | 291 | unsigned timeout = 10 * 100; |
ef8c2dab CC |
292 | |
293 | dma_reg_write(ctlr, CPDMA_SOFTRESET, 1); | |
817f6d1a | 294 | while (timeout) { |
ef8c2dab CC |
295 | if (dma_reg_read(ctlr, CPDMA_SOFTRESET) == 0) |
296 | break; | |
817f6d1a SS |
297 | udelay(10); |
298 | timeout--; | |
ef8c2dab | 299 | } |
817f6d1a | 300 | WARN_ON(!timeout); |
ef8c2dab CC |
301 | } |
302 | ||
303 | for (i = 0; i < ctlr->num_chan; i++) { | |
304 | __raw_writel(0, ctlr->params.txhdp + 4 * i); | |
305 | __raw_writel(0, ctlr->params.rxhdp + 4 * i); | |
306 | __raw_writel(0, ctlr->params.txcp + 4 * i); | |
307 | __raw_writel(0, ctlr->params.rxcp + 4 * i); | |
308 | } | |
309 | ||
310 | dma_reg_write(ctlr, CPDMA_RXINTMASKCLEAR, 0xffffffff); | |
311 | dma_reg_write(ctlr, CPDMA_TXINTMASKCLEAR, 0xffffffff); | |
312 | ||
313 | dma_reg_write(ctlr, CPDMA_TXCONTROL, 1); | |
314 | dma_reg_write(ctlr, CPDMA_RXCONTROL, 1); | |
315 | ||
316 | ctlr->state = CPDMA_STATE_ACTIVE; | |
317 | ||
318 | for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) { | |
319 | if (ctlr->channels[i]) | |
320 | cpdma_chan_start(ctlr->channels[i]); | |
321 | } | |
322 | spin_unlock_irqrestore(&ctlr->lock, flags); | |
323 | return 0; | |
324 | } | |
32a6d90b | 325 | EXPORT_SYMBOL_GPL(cpdma_ctlr_start); |
ef8c2dab CC |
326 | |
327 | int cpdma_ctlr_stop(struct cpdma_ctlr *ctlr) | |
328 | { | |
329 | unsigned long flags; | |
330 | int i; | |
331 | ||
332 | spin_lock_irqsave(&ctlr->lock, flags); | |
cd11cf50 | 333 | if (ctlr->state == CPDMA_STATE_TEARDOWN) { |
ef8c2dab CC |
334 | spin_unlock_irqrestore(&ctlr->lock, flags); |
335 | return -EINVAL; | |
336 | } | |
337 | ||
338 | ctlr->state = CPDMA_STATE_TEARDOWN; | |
339 | ||
340 | for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) { | |
341 | if (ctlr->channels[i]) | |
342 | cpdma_chan_stop(ctlr->channels[i]); | |
343 | } | |
344 | ||
345 | dma_reg_write(ctlr, CPDMA_RXINTMASKCLEAR, 0xffffffff); | |
346 | dma_reg_write(ctlr, CPDMA_TXINTMASKCLEAR, 0xffffffff); | |
347 | ||
348 | dma_reg_write(ctlr, CPDMA_TXCONTROL, 0); | |
349 | dma_reg_write(ctlr, CPDMA_RXCONTROL, 0); | |
350 | ||
351 | ctlr->state = CPDMA_STATE_IDLE; | |
352 | ||
353 | spin_unlock_irqrestore(&ctlr->lock, flags); | |
354 | return 0; | |
355 | } | |
32a6d90b | 356 | EXPORT_SYMBOL_GPL(cpdma_ctlr_stop); |
ef8c2dab | 357 | |
ef8c2dab CC |
358 | int cpdma_ctlr_destroy(struct cpdma_ctlr *ctlr) |
359 | { | |
ef8c2dab CC |
360 | int ret = 0, i; |
361 | ||
362 | if (!ctlr) | |
363 | return -EINVAL; | |
364 | ||
ef8c2dab CC |
365 | if (ctlr->state != CPDMA_STATE_IDLE) |
366 | cpdma_ctlr_stop(ctlr); | |
367 | ||
79876e03 CR |
368 | for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) |
369 | cpdma_chan_destroy(ctlr->channels[i]); | |
ef8c2dab CC |
370 | |
371 | cpdma_desc_pool_destroy(ctlr->pool); | |
ef8c2dab CC |
372 | return ret; |
373 | } | |
32a6d90b | 374 | EXPORT_SYMBOL_GPL(cpdma_ctlr_destroy); |
ef8c2dab CC |
375 | |
376 | int cpdma_ctlr_int_ctrl(struct cpdma_ctlr *ctlr, bool enable) | |
377 | { | |
378 | unsigned long flags; | |
379 | int i, reg; | |
380 | ||
381 | spin_lock_irqsave(&ctlr->lock, flags); | |
382 | if (ctlr->state != CPDMA_STATE_ACTIVE) { | |
383 | spin_unlock_irqrestore(&ctlr->lock, flags); | |
384 | return -EINVAL; | |
385 | } | |
386 | ||
387 | reg = enable ? CPDMA_DMAINTMASKSET : CPDMA_DMAINTMASKCLEAR; | |
388 | dma_reg_write(ctlr, reg, CPDMA_DMAINT_HOSTERR); | |
389 | ||
390 | for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) { | |
391 | if (ctlr->channels[i]) | |
392 | cpdma_chan_int_ctrl(ctlr->channels[i], enable); | |
393 | } | |
394 | ||
395 | spin_unlock_irqrestore(&ctlr->lock, flags); | |
396 | return 0; | |
397 | } | |
6929e24e | 398 | EXPORT_SYMBOL_GPL(cpdma_ctlr_int_ctrl); |
ef8c2dab | 399 | |
510a1e72 | 400 | void cpdma_ctlr_eoi(struct cpdma_ctlr *ctlr, u32 value) |
ef8c2dab | 401 | { |
510a1e72 | 402 | dma_reg_write(ctlr, CPDMA_MACEOIVECTOR, value); |
ef8c2dab | 403 | } |
6929e24e | 404 | EXPORT_SYMBOL_GPL(cpdma_ctlr_eoi); |
ef8c2dab CC |
405 | |
406 | struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num, | |
407 | cpdma_handler_fn handler) | |
408 | { | |
409 | struct cpdma_chan *chan; | |
e1943128 | 410 | int offset = (chan_num % CPDMA_MAX_CHANNELS) * 4; |
ef8c2dab CC |
411 | unsigned long flags; |
412 | ||
413 | if (__chan_linear(chan_num) >= ctlr->num_chan) | |
414 | return NULL; | |
415 | ||
e1943128 | 416 | chan = devm_kzalloc(ctlr->dev, sizeof(*chan), GFP_KERNEL); |
ef8c2dab | 417 | if (!chan) |
e1943128 | 418 | return ERR_PTR(-ENOMEM); |
ef8c2dab CC |
419 | |
420 | spin_lock_irqsave(&ctlr->lock, flags); | |
e1943128 GC |
421 | if (ctlr->channels[chan_num]) { |
422 | spin_unlock_irqrestore(&ctlr->lock, flags); | |
423 | devm_kfree(ctlr->dev, chan); | |
424 | return ERR_PTR(-EBUSY); | |
425 | } | |
ef8c2dab CC |
426 | |
427 | chan->ctlr = ctlr; | |
428 | chan->state = CPDMA_STATE_IDLE; | |
429 | chan->chan_num = chan_num; | |
430 | chan->handler = handler; | |
742fb20f | 431 | chan->desc_num = ctlr->pool->num_desc / 2; |
ef8c2dab CC |
432 | |
433 | if (is_rx_chan(chan)) { | |
434 | chan->hdp = ctlr->params.rxhdp + offset; | |
435 | chan->cp = ctlr->params.rxcp + offset; | |
436 | chan->rxfree = ctlr->params.rxfree + offset; | |
437 | chan->int_set = CPDMA_RXINTMASKSET; | |
438 | chan->int_clear = CPDMA_RXINTMASKCLEAR; | |
439 | chan->td = CPDMA_RXTEARDOWN; | |
440 | chan->dir = DMA_FROM_DEVICE; | |
441 | } else { | |
442 | chan->hdp = ctlr->params.txhdp + offset; | |
443 | chan->cp = ctlr->params.txcp + offset; | |
444 | chan->int_set = CPDMA_TXINTMASKSET; | |
445 | chan->int_clear = CPDMA_TXINTMASKCLEAR; | |
446 | chan->td = CPDMA_TXTEARDOWN; | |
447 | chan->dir = DMA_TO_DEVICE; | |
448 | } | |
449 | chan->mask = BIT(chan_linear(chan)); | |
450 | ||
451 | spin_lock_init(&chan->lock); | |
452 | ||
453 | ctlr->channels[chan_num] = chan; | |
454 | spin_unlock_irqrestore(&ctlr->lock, flags); | |
455 | return chan; | |
ef8c2dab | 456 | } |
32a6d90b | 457 | EXPORT_SYMBOL_GPL(cpdma_chan_create); |
ef8c2dab | 458 | |
1793331e IK |
459 | int cpdma_chan_get_rx_buf_num(struct cpdma_ctlr *ctlr) |
460 | { | |
461 | return ctlr->pool->num_desc / 2; | |
462 | } | |
463 | EXPORT_SYMBOL_GPL(cpdma_chan_get_rx_buf_num); | |
464 | ||
ef8c2dab CC |
465 | int cpdma_chan_destroy(struct cpdma_chan *chan) |
466 | { | |
f37c54b6 | 467 | struct cpdma_ctlr *ctlr; |
ef8c2dab CC |
468 | unsigned long flags; |
469 | ||
470 | if (!chan) | |
471 | return -EINVAL; | |
f37c54b6 | 472 | ctlr = chan->ctlr; |
ef8c2dab CC |
473 | |
474 | spin_lock_irqsave(&ctlr->lock, flags); | |
475 | if (chan->state != CPDMA_STATE_IDLE) | |
476 | cpdma_chan_stop(chan); | |
477 | ctlr->channels[chan->chan_num] = NULL; | |
478 | spin_unlock_irqrestore(&ctlr->lock, flags); | |
ef8c2dab CC |
479 | return 0; |
480 | } | |
32a6d90b | 481 | EXPORT_SYMBOL_GPL(cpdma_chan_destroy); |
ef8c2dab CC |
482 | |
483 | int cpdma_chan_get_stats(struct cpdma_chan *chan, | |
484 | struct cpdma_chan_stats *stats) | |
485 | { | |
486 | unsigned long flags; | |
487 | if (!chan) | |
488 | return -EINVAL; | |
489 | spin_lock_irqsave(&chan->lock, flags); | |
490 | memcpy(stats, &chan->stats, sizeof(*stats)); | |
491 | spin_unlock_irqrestore(&chan->lock, flags); | |
492 | return 0; | |
493 | } | |
0ca04b63 | 494 | EXPORT_SYMBOL_GPL(cpdma_chan_get_stats); |
ef8c2dab | 495 | |
ef8c2dab CC |
496 | static void __cpdma_chan_submit(struct cpdma_chan *chan, |
497 | struct cpdma_desc __iomem *desc) | |
498 | { | |
499 | struct cpdma_ctlr *ctlr = chan->ctlr; | |
500 | struct cpdma_desc __iomem *prev = chan->tail; | |
501 | struct cpdma_desc_pool *pool = ctlr->pool; | |
502 | dma_addr_t desc_dma; | |
503 | u32 mode; | |
504 | ||
505 | desc_dma = desc_phys(pool, desc); | |
506 | ||
507 | /* simple case - idle channel */ | |
508 | if (!chan->head) { | |
509 | chan->stats.head_enqueue++; | |
510 | chan->head = desc; | |
511 | chan->tail = desc; | |
512 | if (chan->state == CPDMA_STATE_ACTIVE) | |
513 | chan_write(chan, hdp, desc_dma); | |
514 | return; | |
515 | } | |
516 | ||
517 | /* first chain the descriptor at the tail of the list */ | |
518 | desc_write(prev, hw_next, desc_dma); | |
519 | chan->tail = desc; | |
520 | chan->stats.tail_enqueue++; | |
521 | ||
522 | /* next check if EOQ has been triggered already */ | |
523 | mode = desc_read(prev, hw_mode); | |
524 | if (((mode & (CPDMA_DESC_EOQ | CPDMA_DESC_OWNER)) == CPDMA_DESC_EOQ) && | |
525 | (chan->state == CPDMA_STATE_ACTIVE)) { | |
526 | desc_write(prev, hw_mode, mode & ~CPDMA_DESC_EOQ); | |
527 | chan_write(chan, hdp, desc_dma); | |
528 | chan->stats.misqueued++; | |
529 | } | |
530 | } | |
531 | ||
532 | int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data, | |
aef614e1 | 533 | int len, int directed) |
ef8c2dab CC |
534 | { |
535 | struct cpdma_ctlr *ctlr = chan->ctlr; | |
536 | struct cpdma_desc __iomem *desc; | |
537 | dma_addr_t buffer; | |
538 | unsigned long flags; | |
539 | u32 mode; | |
540 | int ret = 0; | |
541 | ||
542 | spin_lock_irqsave(&chan->lock, flags); | |
543 | ||
544 | if (chan->state == CPDMA_STATE_TEARDOWN) { | |
545 | ret = -EINVAL; | |
546 | goto unlock_ret; | |
547 | } | |
548 | ||
742fb20f GS |
549 | if (chan->count >= chan->desc_num) { |
550 | chan->stats.desc_alloc_fail++; | |
551 | ret = -ENOMEM; | |
552 | goto unlock_ret; | |
553 | } | |
554 | ||
555 | desc = cpdma_desc_alloc(ctlr->pool); | |
ef8c2dab CC |
556 | if (!desc) { |
557 | chan->stats.desc_alloc_fail++; | |
558 | ret = -ENOMEM; | |
559 | goto unlock_ret; | |
560 | } | |
561 | ||
562 | if (len < ctlr->params.min_packet_size) { | |
563 | len = ctlr->params.min_packet_size; | |
564 | chan->stats.runt_transmit_buff++; | |
565 | } | |
566 | ||
567 | buffer = dma_map_single(ctlr->dev, data, len, chan->dir); | |
14bd0769 SS |
568 | ret = dma_mapping_error(ctlr->dev, buffer); |
569 | if (ret) { | |
570 | cpdma_desc_free(ctlr->pool, desc, 1); | |
571 | ret = -EINVAL; | |
572 | goto unlock_ret; | |
573 | } | |
574 | ||
ef8c2dab | 575 | mode = CPDMA_DESC_OWNER | CPDMA_DESC_SOP | CPDMA_DESC_EOP; |
f6e135c8 | 576 | cpdma_desc_to_port(chan, mode, directed); |
ef8c2dab CC |
577 | |
578 | desc_write(desc, hw_next, 0); | |
579 | desc_write(desc, hw_buffer, buffer); | |
580 | desc_write(desc, hw_len, len); | |
581 | desc_write(desc, hw_mode, mode | len); | |
582 | desc_write(desc, sw_token, token); | |
583 | desc_write(desc, sw_buffer, buffer); | |
584 | desc_write(desc, sw_len, len); | |
585 | ||
586 | __cpdma_chan_submit(chan, desc); | |
587 | ||
588 | if (chan->state == CPDMA_STATE_ACTIVE && chan->rxfree) | |
589 | chan_write(chan, rxfree, 1); | |
590 | ||
591 | chan->count++; | |
592 | ||
593 | unlock_ret: | |
594 | spin_unlock_irqrestore(&chan->lock, flags); | |
595 | return ret; | |
596 | } | |
32a6d90b | 597 | EXPORT_SYMBOL_GPL(cpdma_chan_submit); |
ef8c2dab | 598 | |
fae50823 M |
599 | bool cpdma_check_free_tx_desc(struct cpdma_chan *chan) |
600 | { | |
fae50823 M |
601 | struct cpdma_ctlr *ctlr = chan->ctlr; |
602 | struct cpdma_desc_pool *pool = ctlr->pool; | |
742fb20f GS |
603 | bool free_tx_desc; |
604 | unsigned long flags; | |
fae50823 | 605 | |
742fb20f GS |
606 | spin_lock_irqsave(&chan->lock, flags); |
607 | free_tx_desc = (chan->count < chan->desc_num) && | |
608 | gen_pool_avail(pool->gen_pool); | |
609 | spin_unlock_irqrestore(&chan->lock, flags); | |
610 | return free_tx_desc; | |
fae50823 M |
611 | } |
612 | EXPORT_SYMBOL_GPL(cpdma_check_free_tx_desc); | |
613 | ||
ef8c2dab CC |
614 | static void __cpdma_chan_free(struct cpdma_chan *chan, |
615 | struct cpdma_desc __iomem *desc, | |
616 | int outlen, int status) | |
617 | { | |
618 | struct cpdma_ctlr *ctlr = chan->ctlr; | |
619 | struct cpdma_desc_pool *pool = ctlr->pool; | |
620 | dma_addr_t buff_dma; | |
621 | int origlen; | |
622 | void *token; | |
623 | ||
624 | token = (void *)desc_read(desc, sw_token); | |
625 | buff_dma = desc_read(desc, sw_buffer); | |
626 | origlen = desc_read(desc, sw_len); | |
627 | ||
628 | dma_unmap_single(ctlr->dev, buff_dma, origlen, chan->dir); | |
629 | cpdma_desc_free(pool, desc, 1); | |
630 | (*chan->handler)(token, outlen, status); | |
631 | } | |
632 | ||
633 | static int __cpdma_chan_process(struct cpdma_chan *chan) | |
634 | { | |
635 | struct cpdma_ctlr *ctlr = chan->ctlr; | |
636 | struct cpdma_desc __iomem *desc; | |
637 | int status, outlen; | |
b4727e69 | 638 | int cb_status = 0; |
ef8c2dab CC |
639 | struct cpdma_desc_pool *pool = ctlr->pool; |
640 | dma_addr_t desc_dma; | |
641 | unsigned long flags; | |
642 | ||
643 | spin_lock_irqsave(&chan->lock, flags); | |
644 | ||
645 | desc = chan->head; | |
646 | if (!desc) { | |
647 | chan->stats.empty_dequeue++; | |
648 | status = -ENOENT; | |
649 | goto unlock_ret; | |
650 | } | |
651 | desc_dma = desc_phys(pool, desc); | |
652 | ||
653 | status = __raw_readl(&desc->hw_mode); | |
654 | outlen = status & 0x7ff; | |
655 | if (status & CPDMA_DESC_OWNER) { | |
656 | chan->stats.busy_dequeue++; | |
657 | status = -EBUSY; | |
658 | goto unlock_ret; | |
659 | } | |
28a19fe6 M |
660 | |
661 | if (status & CPDMA_DESC_PASS_CRC) | |
662 | outlen -= CPDMA_DESC_CRC_LEN; | |
663 | ||
f6e135c8 M |
664 | status = status & (CPDMA_DESC_EOQ | CPDMA_DESC_TD_COMPLETE | |
665 | CPDMA_DESC_PORT_MASK); | |
ef8c2dab CC |
666 | |
667 | chan->head = desc_from_phys(pool, desc_read(desc, hw_next)); | |
668 | chan_write(chan, cp, desc_dma); | |
669 | chan->count--; | |
670 | chan->stats.good_dequeue++; | |
671 | ||
672 | if (status & CPDMA_DESC_EOQ) { | |
673 | chan->stats.requeue++; | |
674 | chan_write(chan, hdp, desc_phys(pool, chan->head)); | |
675 | } | |
676 | ||
677 | spin_unlock_irqrestore(&chan->lock, flags); | |
b4727e69 SS |
678 | if (unlikely(status & CPDMA_DESC_TD_COMPLETE)) |
679 | cb_status = -ENOSYS; | |
680 | else | |
681 | cb_status = status; | |
ef8c2dab | 682 | |
b4727e69 | 683 | __cpdma_chan_free(chan, desc, outlen, cb_status); |
ef8c2dab CC |
684 | return status; |
685 | ||
686 | unlock_ret: | |
687 | spin_unlock_irqrestore(&chan->lock, flags); | |
688 | return status; | |
689 | } | |
690 | ||
691 | int cpdma_chan_process(struct cpdma_chan *chan, int quota) | |
692 | { | |
693 | int used = 0, ret = 0; | |
694 | ||
695 | if (chan->state != CPDMA_STATE_ACTIVE) | |
696 | return -EINVAL; | |
697 | ||
698 | while (used < quota) { | |
699 | ret = __cpdma_chan_process(chan); | |
700 | if (ret < 0) | |
701 | break; | |
702 | used++; | |
703 | } | |
704 | return used; | |
705 | } | |
32a6d90b | 706 | EXPORT_SYMBOL_GPL(cpdma_chan_process); |
ef8c2dab CC |
707 | |
708 | int cpdma_chan_start(struct cpdma_chan *chan) | |
709 | { | |
710 | struct cpdma_ctlr *ctlr = chan->ctlr; | |
711 | struct cpdma_desc_pool *pool = ctlr->pool; | |
712 | unsigned long flags; | |
713 | ||
714 | spin_lock_irqsave(&chan->lock, flags); | |
715 | if (chan->state != CPDMA_STATE_IDLE) { | |
716 | spin_unlock_irqrestore(&chan->lock, flags); | |
717 | return -EBUSY; | |
718 | } | |
719 | if (ctlr->state != CPDMA_STATE_ACTIVE) { | |
720 | spin_unlock_irqrestore(&chan->lock, flags); | |
721 | return -EINVAL; | |
722 | } | |
723 | dma_reg_write(ctlr, chan->int_set, chan->mask); | |
724 | chan->state = CPDMA_STATE_ACTIVE; | |
725 | if (chan->head) { | |
726 | chan_write(chan, hdp, desc_phys(pool, chan->head)); | |
727 | if (chan->rxfree) | |
728 | chan_write(chan, rxfree, chan->count); | |
729 | } | |
730 | ||
731 | spin_unlock_irqrestore(&chan->lock, flags); | |
732 | return 0; | |
733 | } | |
32a6d90b | 734 | EXPORT_SYMBOL_GPL(cpdma_chan_start); |
ef8c2dab CC |
735 | |
736 | int cpdma_chan_stop(struct cpdma_chan *chan) | |
737 | { | |
738 | struct cpdma_ctlr *ctlr = chan->ctlr; | |
739 | struct cpdma_desc_pool *pool = ctlr->pool; | |
740 | unsigned long flags; | |
741 | int ret; | |
817f6d1a | 742 | unsigned timeout; |
ef8c2dab CC |
743 | |
744 | spin_lock_irqsave(&chan->lock, flags); | |
cd11cf50 | 745 | if (chan->state == CPDMA_STATE_TEARDOWN) { |
ef8c2dab CC |
746 | spin_unlock_irqrestore(&chan->lock, flags); |
747 | return -EINVAL; | |
748 | } | |
749 | ||
750 | chan->state = CPDMA_STATE_TEARDOWN; | |
751 | dma_reg_write(ctlr, chan->int_clear, chan->mask); | |
752 | ||
753 | /* trigger teardown */ | |
b4ad0428 | 754 | dma_reg_write(ctlr, chan->td, chan_linear(chan)); |
ef8c2dab CC |
755 | |
756 | /* wait for teardown complete */ | |
817f6d1a SS |
757 | timeout = 100 * 100; /* 100 ms */ |
758 | while (timeout) { | |
ef8c2dab CC |
759 | u32 cp = chan_read(chan, cp); |
760 | if ((cp & CPDMA_TEARDOWN_VALUE) == CPDMA_TEARDOWN_VALUE) | |
761 | break; | |
817f6d1a SS |
762 | udelay(10); |
763 | timeout--; | |
ef8c2dab | 764 | } |
817f6d1a | 765 | WARN_ON(!timeout); |
ef8c2dab CC |
766 | chan_write(chan, cp, CPDMA_TEARDOWN_VALUE); |
767 | ||
768 | /* handle completed packets */ | |
7746ab0a | 769 | spin_unlock_irqrestore(&chan->lock, flags); |
ef8c2dab CC |
770 | do { |
771 | ret = __cpdma_chan_process(chan); | |
772 | if (ret < 0) | |
773 | break; | |
774 | } while ((ret & CPDMA_DESC_TD_COMPLETE) == 0); | |
7746ab0a | 775 | spin_lock_irqsave(&chan->lock, flags); |
ef8c2dab CC |
776 | |
777 | /* remaining packets haven't been tx/rx'ed, clean them up */ | |
778 | while (chan->head) { | |
779 | struct cpdma_desc __iomem *desc = chan->head; | |
780 | dma_addr_t next_dma; | |
781 | ||
782 | next_dma = desc_read(desc, hw_next); | |
783 | chan->head = desc_from_phys(pool, next_dma); | |
ffb5ba90 | 784 | chan->count--; |
ef8c2dab CC |
785 | chan->stats.teardown_dequeue++; |
786 | ||
787 | /* issue callback without locks held */ | |
788 | spin_unlock_irqrestore(&chan->lock, flags); | |
789 | __cpdma_chan_free(chan, desc, 0, -ENOSYS); | |
790 | spin_lock_irqsave(&chan->lock, flags); | |
791 | } | |
792 | ||
793 | chan->state = CPDMA_STATE_IDLE; | |
794 | spin_unlock_irqrestore(&chan->lock, flags); | |
795 | return 0; | |
796 | } | |
32a6d90b | 797 | EXPORT_SYMBOL_GPL(cpdma_chan_stop); |
ef8c2dab CC |
798 | |
799 | int cpdma_chan_int_ctrl(struct cpdma_chan *chan, bool enable) | |
800 | { | |
801 | unsigned long flags; | |
802 | ||
803 | spin_lock_irqsave(&chan->lock, flags); | |
804 | if (chan->state != CPDMA_STATE_ACTIVE) { | |
805 | spin_unlock_irqrestore(&chan->lock, flags); | |
806 | return -EINVAL; | |
807 | } | |
808 | ||
809 | dma_reg_write(chan->ctlr, enable ? chan->int_set : chan->int_clear, | |
810 | chan->mask); | |
811 | spin_unlock_irqrestore(&chan->lock, flags); | |
812 | ||
813 | return 0; | |
814 | } | |
815 | ||
816 | struct cpdma_control_info { | |
817 | u32 reg; | |
818 | u32 shift, mask; | |
819 | int access; | |
820 | #define ACCESS_RO BIT(0) | |
821 | #define ACCESS_WO BIT(1) | |
822 | #define ACCESS_RW (ACCESS_RO | ACCESS_WO) | |
823 | }; | |
824 | ||
df784160 | 825 | static struct cpdma_control_info controls[] = { |
ef8c2dab CC |
826 | [CPDMA_CMD_IDLE] = {CPDMA_DMACONTROL, 3, 1, ACCESS_WO}, |
827 | [CPDMA_COPY_ERROR_FRAMES] = {CPDMA_DMACONTROL, 4, 1, ACCESS_RW}, | |
828 | [CPDMA_RX_OFF_LEN_UPDATE] = {CPDMA_DMACONTROL, 2, 1, ACCESS_RW}, | |
829 | [CPDMA_RX_OWNERSHIP_FLIP] = {CPDMA_DMACONTROL, 1, 1, ACCESS_RW}, | |
830 | [CPDMA_TX_PRIO_FIXED] = {CPDMA_DMACONTROL, 0, 1, ACCESS_RW}, | |
831 | [CPDMA_STAT_IDLE] = {CPDMA_DMASTATUS, 31, 1, ACCESS_RO}, | |
832 | [CPDMA_STAT_TX_ERR_CODE] = {CPDMA_DMASTATUS, 20, 0xf, ACCESS_RW}, | |
833 | [CPDMA_STAT_TX_ERR_CHAN] = {CPDMA_DMASTATUS, 16, 0x7, ACCESS_RW}, | |
834 | [CPDMA_STAT_RX_ERR_CODE] = {CPDMA_DMASTATUS, 12, 0xf, ACCESS_RW}, | |
835 | [CPDMA_STAT_RX_ERR_CHAN] = {CPDMA_DMASTATUS, 8, 0x7, ACCESS_RW}, | |
836 | [CPDMA_RX_BUFFER_OFFSET] = {CPDMA_RXBUFFOFS, 0, 0xffff, ACCESS_RW}, | |
837 | }; | |
838 | ||
839 | int cpdma_control_get(struct cpdma_ctlr *ctlr, int control) | |
840 | { | |
841 | unsigned long flags; | |
842 | struct cpdma_control_info *info = &controls[control]; | |
843 | int ret; | |
844 | ||
845 | spin_lock_irqsave(&ctlr->lock, flags); | |
846 | ||
847 | ret = -ENOTSUPP; | |
848 | if (!ctlr->params.has_ext_regs) | |
849 | goto unlock_ret; | |
850 | ||
851 | ret = -EINVAL; | |
852 | if (ctlr->state != CPDMA_STATE_ACTIVE) | |
853 | goto unlock_ret; | |
854 | ||
855 | ret = -ENOENT; | |
856 | if (control < 0 || control >= ARRAY_SIZE(controls)) | |
857 | goto unlock_ret; | |
858 | ||
859 | ret = -EPERM; | |
860 | if ((info->access & ACCESS_RO) != ACCESS_RO) | |
861 | goto unlock_ret; | |
862 | ||
863 | ret = (dma_reg_read(ctlr, info->reg) >> info->shift) & info->mask; | |
864 | ||
865 | unlock_ret: | |
866 | spin_unlock_irqrestore(&ctlr->lock, flags); | |
867 | return ret; | |
868 | } | |
869 | ||
870 | int cpdma_control_set(struct cpdma_ctlr *ctlr, int control, int value) | |
871 | { | |
872 | unsigned long flags; | |
873 | struct cpdma_control_info *info = &controls[control]; | |
874 | int ret; | |
875 | u32 val; | |
876 | ||
877 | spin_lock_irqsave(&ctlr->lock, flags); | |
878 | ||
879 | ret = -ENOTSUPP; | |
880 | if (!ctlr->params.has_ext_regs) | |
881 | goto unlock_ret; | |
882 | ||
883 | ret = -EINVAL; | |
884 | if (ctlr->state != CPDMA_STATE_ACTIVE) | |
885 | goto unlock_ret; | |
886 | ||
887 | ret = -ENOENT; | |
888 | if (control < 0 || control >= ARRAY_SIZE(controls)) | |
889 | goto unlock_ret; | |
890 | ||
891 | ret = -EPERM; | |
892 | if ((info->access & ACCESS_WO) != ACCESS_WO) | |
893 | goto unlock_ret; | |
894 | ||
895 | val = dma_reg_read(ctlr, info->reg); | |
896 | val &= ~(info->mask << info->shift); | |
897 | val |= (value & info->mask) << info->shift; | |
898 | dma_reg_write(ctlr, info->reg, val); | |
899 | ret = 0; | |
900 | ||
901 | unlock_ret: | |
902 | spin_unlock_irqrestore(&ctlr->lock, flags); | |
903 | return ret; | |
904 | } | |
6929e24e | 905 | EXPORT_SYMBOL_GPL(cpdma_control_set); |
4bc21d41 SS |
906 | |
907 | MODULE_LICENSE("GPL"); |