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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) ST-Ericsson SA 2007-2010
4 * Author: Per Forlin <per.forlin@stericsson.com> for ST-Ericsson
5 * Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson
6 */
7
8#include <linux/kernel.h>
9#include <linux/platform_data/dma-ste-dma40.h>
10
11#include "ste_dma40_ll.h"
12
13static u8 d40_width_to_bits(enum dma_slave_buswidth width)
14{
15 if (width == DMA_SLAVE_BUSWIDTH_1_BYTE)
16 return STEDMA40_ESIZE_8_BIT;
17 else if (width == DMA_SLAVE_BUSWIDTH_2_BYTES)
18 return STEDMA40_ESIZE_16_BIT;
19 else if (width == DMA_SLAVE_BUSWIDTH_8_BYTES)
20 return STEDMA40_ESIZE_64_BIT;
21 else
22 return STEDMA40_ESIZE_32_BIT;
23}
24
25/* Sets up proper LCSP1 and LCSP3 register for a logical channel */
26void d40_log_cfg(struct stedma40_chan_cfg *cfg,
27 u32 *lcsp1, u32 *lcsp3)
28{
29 u32 l3 = 0; /* dst */
30 u32 l1 = 0; /* src */
31
32 /* src is mem? -> increase address pos */
33 if (cfg->dir == DMA_MEM_TO_DEV ||
34 cfg->dir == DMA_MEM_TO_MEM)
35 l1 |= BIT(D40_MEM_LCSP1_SCFG_INCR_POS);
36
37 /* dst is mem? -> increase address pos */
38 if (cfg->dir == DMA_DEV_TO_MEM ||
39 cfg->dir == DMA_MEM_TO_MEM)
40 l3 |= BIT(D40_MEM_LCSP3_DCFG_INCR_POS);
41
42 /* src is hw? -> master port 1 */
43 if (cfg->dir == DMA_DEV_TO_MEM ||
44 cfg->dir == DMA_DEV_TO_DEV)
45 l1 |= BIT(D40_MEM_LCSP1_SCFG_MST_POS);
46
47 /* dst is hw? -> master port 1 */
48 if (cfg->dir == DMA_MEM_TO_DEV ||
49 cfg->dir == DMA_DEV_TO_DEV)
50 l3 |= BIT(D40_MEM_LCSP3_DCFG_MST_POS);
51
52 l3 |= BIT(D40_MEM_LCSP3_DCFG_EIM_POS);
53 l3 |= cfg->dst_info.psize << D40_MEM_LCSP3_DCFG_PSIZE_POS;
54 l3 |= d40_width_to_bits(cfg->dst_info.data_width)
55 << D40_MEM_LCSP3_DCFG_ESIZE_POS;
56
57 l1 |= BIT(D40_MEM_LCSP1_SCFG_EIM_POS);
58 l1 |= cfg->src_info.psize << D40_MEM_LCSP1_SCFG_PSIZE_POS;
59 l1 |= d40_width_to_bits(cfg->src_info.data_width)
60 << D40_MEM_LCSP1_SCFG_ESIZE_POS;
61
62 *lcsp1 = l1;
63 *lcsp3 = l3;
64
65}
66
67void d40_phy_cfg(struct stedma40_chan_cfg *cfg, u32 *src_cfg, u32 *dst_cfg)
68{
69 u32 src = 0;
70 u32 dst = 0;
71
72 if ((cfg->dir == DMA_DEV_TO_MEM) ||
73 (cfg->dir == DMA_DEV_TO_DEV)) {
74 /* Set master port to 1 */
75 src |= BIT(D40_SREG_CFG_MST_POS);
76 src |= D40_TYPE_TO_EVENT(cfg->dev_type);
77
78 if (cfg->src_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL)
79 src |= BIT(D40_SREG_CFG_PHY_TM_POS);
80 else
81 src |= 3 << D40_SREG_CFG_PHY_TM_POS;
82 }
83 if ((cfg->dir == DMA_MEM_TO_DEV) ||
84 (cfg->dir == DMA_DEV_TO_DEV)) {
85 /* Set master port to 1 */
86 dst |= BIT(D40_SREG_CFG_MST_POS);
87 dst |= D40_TYPE_TO_EVENT(cfg->dev_type);
88
89 if (cfg->dst_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL)
90 dst |= BIT(D40_SREG_CFG_PHY_TM_POS);
91 else
92 dst |= 3 << D40_SREG_CFG_PHY_TM_POS;
93 }
94 /* Interrupt on end of transfer for destination */
95 dst |= BIT(D40_SREG_CFG_TIM_POS);
96
97 /* Generate interrupt on error */
98 src |= BIT(D40_SREG_CFG_EIM_POS);
99 dst |= BIT(D40_SREG_CFG_EIM_POS);
100
101 /* PSIZE */
102 if (cfg->src_info.psize != STEDMA40_PSIZE_PHY_1) {
103 src |= BIT(D40_SREG_CFG_PHY_PEN_POS);
104 src |= cfg->src_info.psize << D40_SREG_CFG_PSIZE_POS;
105 }
106 if (cfg->dst_info.psize != STEDMA40_PSIZE_PHY_1) {
107 dst |= BIT(D40_SREG_CFG_PHY_PEN_POS);
108 dst |= cfg->dst_info.psize << D40_SREG_CFG_PSIZE_POS;
109 }
110
111 /* Element size */
112 src |= d40_width_to_bits(cfg->src_info.data_width)
113 << D40_SREG_CFG_ESIZE_POS;
114 dst |= d40_width_to_bits(cfg->dst_info.data_width)
115 << D40_SREG_CFG_ESIZE_POS;
116
117 /* Set the priority bit to high for the physical channel */
118 if (cfg->high_priority) {
119 src |= BIT(D40_SREG_CFG_PRI_POS);
120 dst |= BIT(D40_SREG_CFG_PRI_POS);
121 }
122
123 if (cfg->src_info.big_endian)
124 src |= BIT(D40_SREG_CFG_LBE_POS);
125 if (cfg->dst_info.big_endian)
126 dst |= BIT(D40_SREG_CFG_LBE_POS);
127
128 *src_cfg = src;
129 *dst_cfg = dst;
130}
131
132static int d40_phy_fill_lli(struct d40_phy_lli *lli,
133 dma_addr_t data,
134 u32 data_size,
135 dma_addr_t next_lli,
136 u32 reg_cfg,
137 struct stedma40_half_channel_info *info,
138 unsigned int flags)
139{
140 bool addr_inc = flags & LLI_ADDR_INC;
141 bool term_int = flags & LLI_TERM_INT;
142 unsigned int data_width = info->data_width;
143 int psize = info->psize;
144 int num_elems;
145
146 if (psize == STEDMA40_PSIZE_PHY_1)
147 num_elems = 1;
148 else
149 num_elems = 2 << psize;
150
151 /* Must be aligned */
152 if (!IS_ALIGNED(data, data_width))
153 return -EINVAL;
154
155 /* Transfer size can't be smaller than (num_elms * elem_size) */
156 if (data_size < num_elems * data_width)
157 return -EINVAL;
158
159 /* The number of elements. IE now many chunks */
160 lli->reg_elt = (data_size / data_width) << D40_SREG_ELEM_PHY_ECNT_POS;
161
162 /*
163 * Distance to next element sized entry.
164 * Usually the size of the element unless you want gaps.
165 */
166 if (addr_inc)
167 lli->reg_elt |= data_width << D40_SREG_ELEM_PHY_EIDX_POS;
168
169 /* Where the data is */
170 lli->reg_ptr = data;
171 lli->reg_cfg = reg_cfg;
172
173 /* If this scatter list entry is the last one, no next link */
174 if (next_lli == 0)
175 lli->reg_lnk = BIT(D40_SREG_LNK_PHY_TCP_POS);
176 else
177 lli->reg_lnk = next_lli;
178
179 /* Set/clear interrupt generation on this link item.*/
180 if (term_int)
181 lli->reg_cfg |= BIT(D40_SREG_CFG_TIM_POS);
182 else
183 lli->reg_cfg &= ~BIT(D40_SREG_CFG_TIM_POS);
184
185 /*
186 * Post link - D40_SREG_LNK_PHY_PRE_POS = 0
187 * Relink happens after transfer completion.
188 */
189
190 return 0;
191}
192
193static int d40_seg_size(int size, int data_width1, int data_width2)
194{
195 u32 max_w = max(data_width1, data_width2);
196 u32 min_w = min(data_width1, data_width2);
197 u32 seg_max = ALIGN(STEDMA40_MAX_SEG_SIZE * min_w, max_w);
198
199 if (seg_max > STEDMA40_MAX_SEG_SIZE)
200 seg_max -= max_w;
201
202 if (size <= seg_max)
203 return size;
204
205 if (size <= 2 * seg_max)
206 return ALIGN(size / 2, max_w);
207
208 return seg_max;
209}
210
211static struct d40_phy_lli *
212d40_phy_buf_to_lli(struct d40_phy_lli *lli, dma_addr_t addr, u32 size,
213 dma_addr_t lli_phys, dma_addr_t first_phys, u32 reg_cfg,
214 struct stedma40_half_channel_info *info,
215 struct stedma40_half_channel_info *otherinfo,
216 unsigned long flags)
217{
218 bool lastlink = flags & LLI_LAST_LINK;
219 bool addr_inc = flags & LLI_ADDR_INC;
220 bool term_int = flags & LLI_TERM_INT;
221 bool cyclic = flags & LLI_CYCLIC;
222 int err;
223 dma_addr_t next = lli_phys;
224 int size_rest = size;
225 int size_seg = 0;
226
227 /*
228 * This piece may be split up based on d40_seg_size(); we only want the
229 * term int on the last part.
230 */
231 if (term_int)
232 flags &= ~LLI_TERM_INT;
233
234 do {
235 size_seg = d40_seg_size(size_rest, info->data_width,
236 otherinfo->data_width);
237 size_rest -= size_seg;
238
239 if (size_rest == 0 && term_int)
240 flags |= LLI_TERM_INT;
241
242 if (size_rest == 0 && lastlink)
243 next = cyclic ? first_phys : 0;
244 else
245 next = ALIGN(next + sizeof(struct d40_phy_lli),
246 D40_LLI_ALIGN);
247
248 err = d40_phy_fill_lli(lli, addr, size_seg, next,
249 reg_cfg, info, flags);
250
251 if (err)
252 goto err;
253
254 lli++;
255 if (addr_inc)
256 addr += size_seg;
257 } while (size_rest);
258
259 return lli;
260
261err:
262 return NULL;
263}
264
265int d40_phy_sg_to_lli(struct scatterlist *sg,
266 int sg_len,
267 dma_addr_t target,
268 struct d40_phy_lli *lli_sg,
269 dma_addr_t lli_phys,
270 u32 reg_cfg,
271 struct stedma40_half_channel_info *info,
272 struct stedma40_half_channel_info *otherinfo,
273 unsigned long flags)
274{
275 int total_size = 0;
276 int i;
277 struct scatterlist *current_sg = sg;
278 struct d40_phy_lli *lli = lli_sg;
279 dma_addr_t l_phys = lli_phys;
280
281 if (!target)
282 flags |= LLI_ADDR_INC;
283
284 for_each_sg(sg, current_sg, sg_len, i) {
285 dma_addr_t sg_addr = sg_dma_address(current_sg);
286 unsigned int len = sg_dma_len(current_sg);
287 dma_addr_t dst = target ?: sg_addr;
288
289 total_size += sg_dma_len(current_sg);
290
291 if (i == sg_len - 1)
292 flags |= LLI_TERM_INT | LLI_LAST_LINK;
293
294 l_phys = ALIGN(lli_phys + (lli - lli_sg) *
295 sizeof(struct d40_phy_lli), D40_LLI_ALIGN);
296
297 lli = d40_phy_buf_to_lli(lli, dst, len, l_phys, lli_phys,
298 reg_cfg, info, otherinfo, flags);
299
300 if (lli == NULL)
301 return -EINVAL;
302 }
303
304 return total_size;
305}
306
307
308/* DMA logical lli operations */
309
310static void d40_log_lli_link(struct d40_log_lli *lli_dst,
311 struct d40_log_lli *lli_src,
312 int next, unsigned int flags)
313{
314 bool interrupt = flags & LLI_TERM_INT;
315 u32 slos = 0;
316 u32 dlos = 0;
317
318 if (next != -EINVAL) {
319 slos = next * 2;
320 dlos = next * 2 + 1;
321 }
322
323 if (interrupt) {
324 lli_dst->lcsp13 |= D40_MEM_LCSP1_SCFG_TIM_MASK;
325 lli_dst->lcsp13 |= D40_MEM_LCSP3_DTCP_MASK;
326 }
327
328 lli_src->lcsp13 = (lli_src->lcsp13 & ~D40_MEM_LCSP1_SLOS_MASK) |
329 (slos << D40_MEM_LCSP1_SLOS_POS);
330
331 lli_dst->lcsp13 = (lli_dst->lcsp13 & ~D40_MEM_LCSP1_SLOS_MASK) |
332 (dlos << D40_MEM_LCSP1_SLOS_POS);
333}
334
335void d40_log_lli_lcpa_write(struct d40_log_lli_full *lcpa,
336 struct d40_log_lli *lli_dst,
337 struct d40_log_lli *lli_src,
338 int next, unsigned int flags)
339{
340 d40_log_lli_link(lli_dst, lli_src, next, flags);
341
342 writel_relaxed(lli_src->lcsp02, &lcpa[0].lcsp0);
343 writel_relaxed(lli_src->lcsp13, &lcpa[0].lcsp1);
344 writel_relaxed(lli_dst->lcsp02, &lcpa[0].lcsp2);
345 writel_relaxed(lli_dst->lcsp13, &lcpa[0].lcsp3);
346}
347
348void d40_log_lli_lcla_write(struct d40_log_lli *lcla,
349 struct d40_log_lli *lli_dst,
350 struct d40_log_lli *lli_src,
351 int next, unsigned int flags)
352{
353 d40_log_lli_link(lli_dst, lli_src, next, flags);
354
355 writel_relaxed(lli_src->lcsp02, &lcla[0].lcsp02);
356 writel_relaxed(lli_src->lcsp13, &lcla[0].lcsp13);
357 writel_relaxed(lli_dst->lcsp02, &lcla[1].lcsp02);
358 writel_relaxed(lli_dst->lcsp13, &lcla[1].lcsp13);
359}
360
361static void d40_log_fill_lli(struct d40_log_lli *lli,
362 dma_addr_t data, u32 data_size,
363 u32 reg_cfg,
364 u32 data_width,
365 unsigned int flags)
366{
367 bool addr_inc = flags & LLI_ADDR_INC;
368
369 lli->lcsp13 = reg_cfg;
370
371 /* The number of elements to transfer */
372 lli->lcsp02 = ((data_size / data_width) <<
373 D40_MEM_LCSP0_ECNT_POS) & D40_MEM_LCSP0_ECNT_MASK;
374
375 BUG_ON((data_size / data_width) > STEDMA40_MAX_SEG_SIZE);
376
377 /* 16 LSBs address of the current element */
378 lli->lcsp02 |= data & D40_MEM_LCSP0_SPTR_MASK;
379 /* 16 MSBs address of the current element */
380 lli->lcsp13 |= data & D40_MEM_LCSP1_SPTR_MASK;
381
382 if (addr_inc)
383 lli->lcsp13 |= D40_MEM_LCSP1_SCFG_INCR_MASK;
384
385}
386
387static struct d40_log_lli *d40_log_buf_to_lli(struct d40_log_lli *lli_sg,
388 dma_addr_t addr,
389 int size,
390 u32 lcsp13, /* src or dst*/
391 u32 data_width1,
392 u32 data_width2,
393 unsigned int flags)
394{
395 bool addr_inc = flags & LLI_ADDR_INC;
396 struct d40_log_lli *lli = lli_sg;
397 int size_rest = size;
398 int size_seg = 0;
399
400 do {
401 size_seg = d40_seg_size(size_rest, data_width1, data_width2);
402 size_rest -= size_seg;
403
404 d40_log_fill_lli(lli,
405 addr,
406 size_seg,
407 lcsp13, data_width1,
408 flags);
409 if (addr_inc)
410 addr += size_seg;
411 lli++;
412 } while (size_rest);
413
414 return lli;
415}
416
417int d40_log_sg_to_lli(struct scatterlist *sg,
418 int sg_len,
419 dma_addr_t dev_addr,
420 struct d40_log_lli *lli_sg,
421 u32 lcsp13, /* src or dst*/
422 u32 data_width1, u32 data_width2)
423{
424 int total_size = 0;
425 struct scatterlist *current_sg = sg;
426 int i;
427 struct d40_log_lli *lli = lli_sg;
428 unsigned long flags = 0;
429
430 if (!dev_addr)
431 flags |= LLI_ADDR_INC;
432
433 for_each_sg(sg, current_sg, sg_len, i) {
434 dma_addr_t sg_addr = sg_dma_address(current_sg);
435 unsigned int len = sg_dma_len(current_sg);
436 dma_addr_t addr = dev_addr ?: sg_addr;
437
438 total_size += sg_dma_len(current_sg);
439
440 lli = d40_log_buf_to_lli(lli, addr, len,
441 lcsp13,
442 data_width1,
443 data_width2,
444 flags);
445 }
446
447 return total_size;
448}
1/*
2 * Copyright (C) ST-Ericsson SA 2007-2010
3 * Author: Per Forlin <per.forlin@stericsson.com> for ST-Ericsson
4 * Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson
5 * License terms: GNU General Public License (GPL) version 2
6 */
7
8#include <linux/kernel.h>
9#include <plat/ste_dma40.h>
10
11#include "ste_dma40_ll.h"
12
13/* Sets up proper LCSP1 and LCSP3 register for a logical channel */
14void d40_log_cfg(struct stedma40_chan_cfg *cfg,
15 u32 *lcsp1, u32 *lcsp3)
16{
17 u32 l3 = 0; /* dst */
18 u32 l1 = 0; /* src */
19
20 /* src is mem? -> increase address pos */
21 if (cfg->dir == STEDMA40_MEM_TO_PERIPH ||
22 cfg->dir == STEDMA40_MEM_TO_MEM)
23 l1 |= 1 << D40_MEM_LCSP1_SCFG_INCR_POS;
24
25 /* dst is mem? -> increase address pos */
26 if (cfg->dir == STEDMA40_PERIPH_TO_MEM ||
27 cfg->dir == STEDMA40_MEM_TO_MEM)
28 l3 |= 1 << D40_MEM_LCSP3_DCFG_INCR_POS;
29
30 /* src is hw? -> master port 1 */
31 if (cfg->dir == STEDMA40_PERIPH_TO_MEM ||
32 cfg->dir == STEDMA40_PERIPH_TO_PERIPH)
33 l1 |= 1 << D40_MEM_LCSP1_SCFG_MST_POS;
34
35 /* dst is hw? -> master port 1 */
36 if (cfg->dir == STEDMA40_MEM_TO_PERIPH ||
37 cfg->dir == STEDMA40_PERIPH_TO_PERIPH)
38 l3 |= 1 << D40_MEM_LCSP3_DCFG_MST_POS;
39
40 l3 |= 1 << D40_MEM_LCSP3_DCFG_EIM_POS;
41 l3 |= cfg->dst_info.psize << D40_MEM_LCSP3_DCFG_PSIZE_POS;
42 l3 |= cfg->dst_info.data_width << D40_MEM_LCSP3_DCFG_ESIZE_POS;
43
44 l1 |= 1 << D40_MEM_LCSP1_SCFG_EIM_POS;
45 l1 |= cfg->src_info.psize << D40_MEM_LCSP1_SCFG_PSIZE_POS;
46 l1 |= cfg->src_info.data_width << D40_MEM_LCSP1_SCFG_ESIZE_POS;
47
48 *lcsp1 = l1;
49 *lcsp3 = l3;
50
51}
52
53/* Sets up SRC and DST CFG register for both logical and physical channels */
54void d40_phy_cfg(struct stedma40_chan_cfg *cfg,
55 u32 *src_cfg, u32 *dst_cfg, bool is_log)
56{
57 u32 src = 0;
58 u32 dst = 0;
59
60 if (!is_log) {
61 /* Physical channel */
62 if ((cfg->dir == STEDMA40_PERIPH_TO_MEM) ||
63 (cfg->dir == STEDMA40_PERIPH_TO_PERIPH)) {
64 /* Set master port to 1 */
65 src |= 1 << D40_SREG_CFG_MST_POS;
66 src |= D40_TYPE_TO_EVENT(cfg->src_dev_type);
67
68 if (cfg->src_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL)
69 src |= 1 << D40_SREG_CFG_PHY_TM_POS;
70 else
71 src |= 3 << D40_SREG_CFG_PHY_TM_POS;
72 }
73 if ((cfg->dir == STEDMA40_MEM_TO_PERIPH) ||
74 (cfg->dir == STEDMA40_PERIPH_TO_PERIPH)) {
75 /* Set master port to 1 */
76 dst |= 1 << D40_SREG_CFG_MST_POS;
77 dst |= D40_TYPE_TO_EVENT(cfg->dst_dev_type);
78
79 if (cfg->dst_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL)
80 dst |= 1 << D40_SREG_CFG_PHY_TM_POS;
81 else
82 dst |= 3 << D40_SREG_CFG_PHY_TM_POS;
83 }
84 /* Interrupt on end of transfer for destination */
85 dst |= 1 << D40_SREG_CFG_TIM_POS;
86
87 /* Generate interrupt on error */
88 src |= 1 << D40_SREG_CFG_EIM_POS;
89 dst |= 1 << D40_SREG_CFG_EIM_POS;
90
91 /* PSIZE */
92 if (cfg->src_info.psize != STEDMA40_PSIZE_PHY_1) {
93 src |= 1 << D40_SREG_CFG_PHY_PEN_POS;
94 src |= cfg->src_info.psize << D40_SREG_CFG_PSIZE_POS;
95 }
96 if (cfg->dst_info.psize != STEDMA40_PSIZE_PHY_1) {
97 dst |= 1 << D40_SREG_CFG_PHY_PEN_POS;
98 dst |= cfg->dst_info.psize << D40_SREG_CFG_PSIZE_POS;
99 }
100
101 /* Element size */
102 src |= cfg->src_info.data_width << D40_SREG_CFG_ESIZE_POS;
103 dst |= cfg->dst_info.data_width << D40_SREG_CFG_ESIZE_POS;
104
105 } else {
106 /* Logical channel */
107 dst |= 1 << D40_SREG_CFG_LOG_GIM_POS;
108 src |= 1 << D40_SREG_CFG_LOG_GIM_POS;
109 }
110
111 if (cfg->high_priority) {
112 src |= 1 << D40_SREG_CFG_PRI_POS;
113 dst |= 1 << D40_SREG_CFG_PRI_POS;
114 }
115
116 if (cfg->src_info.big_endian)
117 src |= 1 << D40_SREG_CFG_LBE_POS;
118 if (cfg->dst_info.big_endian)
119 dst |= 1 << D40_SREG_CFG_LBE_POS;
120
121 *src_cfg = src;
122 *dst_cfg = dst;
123}
124
125static int d40_phy_fill_lli(struct d40_phy_lli *lli,
126 dma_addr_t data,
127 u32 data_size,
128 dma_addr_t next_lli,
129 u32 reg_cfg,
130 struct stedma40_half_channel_info *info,
131 unsigned int flags)
132{
133 bool addr_inc = flags & LLI_ADDR_INC;
134 bool term_int = flags & LLI_TERM_INT;
135 unsigned int data_width = info->data_width;
136 int psize = info->psize;
137 int num_elems;
138
139 if (psize == STEDMA40_PSIZE_PHY_1)
140 num_elems = 1;
141 else
142 num_elems = 2 << psize;
143
144 /* Must be aligned */
145 if (!IS_ALIGNED(data, 0x1 << data_width))
146 return -EINVAL;
147
148 /* Transfer size can't be smaller than (num_elms * elem_size) */
149 if (data_size < num_elems * (0x1 << data_width))
150 return -EINVAL;
151
152 /* The number of elements. IE now many chunks */
153 lli->reg_elt = (data_size >> data_width) << D40_SREG_ELEM_PHY_ECNT_POS;
154
155 /*
156 * Distance to next element sized entry.
157 * Usually the size of the element unless you want gaps.
158 */
159 if (addr_inc)
160 lli->reg_elt |= (0x1 << data_width) <<
161 D40_SREG_ELEM_PHY_EIDX_POS;
162
163 /* Where the data is */
164 lli->reg_ptr = data;
165 lli->reg_cfg = reg_cfg;
166
167 /* If this scatter list entry is the last one, no next link */
168 if (next_lli == 0)
169 lli->reg_lnk = 0x1 << D40_SREG_LNK_PHY_TCP_POS;
170 else
171 lli->reg_lnk = next_lli;
172
173 /* Set/clear interrupt generation on this link item.*/
174 if (term_int)
175 lli->reg_cfg |= 0x1 << D40_SREG_CFG_TIM_POS;
176 else
177 lli->reg_cfg &= ~(0x1 << D40_SREG_CFG_TIM_POS);
178
179 /* Post link */
180 lli->reg_lnk |= 0 << D40_SREG_LNK_PHY_PRE_POS;
181
182 return 0;
183}
184
185static int d40_seg_size(int size, int data_width1, int data_width2)
186{
187 u32 max_w = max(data_width1, data_width2);
188 u32 min_w = min(data_width1, data_width2);
189 u32 seg_max = ALIGN(STEDMA40_MAX_SEG_SIZE << min_w, 1 << max_w);
190
191 if (seg_max > STEDMA40_MAX_SEG_SIZE)
192 seg_max -= (1 << max_w);
193
194 if (size <= seg_max)
195 return size;
196
197 if (size <= 2 * seg_max)
198 return ALIGN(size / 2, 1 << max_w);
199
200 return seg_max;
201}
202
203static struct d40_phy_lli *
204d40_phy_buf_to_lli(struct d40_phy_lli *lli, dma_addr_t addr, u32 size,
205 dma_addr_t lli_phys, dma_addr_t first_phys, u32 reg_cfg,
206 struct stedma40_half_channel_info *info,
207 struct stedma40_half_channel_info *otherinfo,
208 unsigned long flags)
209{
210 bool lastlink = flags & LLI_LAST_LINK;
211 bool addr_inc = flags & LLI_ADDR_INC;
212 bool term_int = flags & LLI_TERM_INT;
213 bool cyclic = flags & LLI_CYCLIC;
214 int err;
215 dma_addr_t next = lli_phys;
216 int size_rest = size;
217 int size_seg = 0;
218
219 /*
220 * This piece may be split up based on d40_seg_size(); we only want the
221 * term int on the last part.
222 */
223 if (term_int)
224 flags &= ~LLI_TERM_INT;
225
226 do {
227 size_seg = d40_seg_size(size_rest, info->data_width,
228 otherinfo->data_width);
229 size_rest -= size_seg;
230
231 if (size_rest == 0 && term_int)
232 flags |= LLI_TERM_INT;
233
234 if (size_rest == 0 && lastlink)
235 next = cyclic ? first_phys : 0;
236 else
237 next = ALIGN(next + sizeof(struct d40_phy_lli),
238 D40_LLI_ALIGN);
239
240 err = d40_phy_fill_lli(lli, addr, size_seg, next,
241 reg_cfg, info, flags);
242
243 if (err)
244 goto err;
245
246 lli++;
247 if (addr_inc)
248 addr += size_seg;
249 } while (size_rest);
250
251 return lli;
252
253 err:
254 return NULL;
255}
256
257int d40_phy_sg_to_lli(struct scatterlist *sg,
258 int sg_len,
259 dma_addr_t target,
260 struct d40_phy_lli *lli_sg,
261 dma_addr_t lli_phys,
262 u32 reg_cfg,
263 struct stedma40_half_channel_info *info,
264 struct stedma40_half_channel_info *otherinfo,
265 unsigned long flags)
266{
267 int total_size = 0;
268 int i;
269 struct scatterlist *current_sg = sg;
270 struct d40_phy_lli *lli = lli_sg;
271 dma_addr_t l_phys = lli_phys;
272
273 if (!target)
274 flags |= LLI_ADDR_INC;
275
276 for_each_sg(sg, current_sg, sg_len, i) {
277 dma_addr_t sg_addr = sg_dma_address(current_sg);
278 unsigned int len = sg_dma_len(current_sg);
279 dma_addr_t dst = target ?: sg_addr;
280
281 total_size += sg_dma_len(current_sg);
282
283 if (i == sg_len - 1)
284 flags |= LLI_TERM_INT | LLI_LAST_LINK;
285
286 l_phys = ALIGN(lli_phys + (lli - lli_sg) *
287 sizeof(struct d40_phy_lli), D40_LLI_ALIGN);
288
289 lli = d40_phy_buf_to_lli(lli, dst, len, l_phys, lli_phys,
290 reg_cfg, info, otherinfo, flags);
291
292 if (lli == NULL)
293 return -EINVAL;
294 }
295
296 return total_size;
297}
298
299
300/* DMA logical lli operations */
301
302static void d40_log_lli_link(struct d40_log_lli *lli_dst,
303 struct d40_log_lli *lli_src,
304 int next, unsigned int flags)
305{
306 bool interrupt = flags & LLI_TERM_INT;
307 u32 slos = 0;
308 u32 dlos = 0;
309
310 if (next != -EINVAL) {
311 slos = next * 2;
312 dlos = next * 2 + 1;
313 }
314
315 if (interrupt) {
316 lli_dst->lcsp13 |= D40_MEM_LCSP1_SCFG_TIM_MASK;
317 lli_dst->lcsp13 |= D40_MEM_LCSP3_DTCP_MASK;
318 }
319
320 lli_src->lcsp13 = (lli_src->lcsp13 & ~D40_MEM_LCSP1_SLOS_MASK) |
321 (slos << D40_MEM_LCSP1_SLOS_POS);
322
323 lli_dst->lcsp13 = (lli_dst->lcsp13 & ~D40_MEM_LCSP1_SLOS_MASK) |
324 (dlos << D40_MEM_LCSP1_SLOS_POS);
325}
326
327void d40_log_lli_lcpa_write(struct d40_log_lli_full *lcpa,
328 struct d40_log_lli *lli_dst,
329 struct d40_log_lli *lli_src,
330 int next, unsigned int flags)
331{
332 d40_log_lli_link(lli_dst, lli_src, next, flags);
333
334 writel(lli_src->lcsp02, &lcpa[0].lcsp0);
335 writel(lli_src->lcsp13, &lcpa[0].lcsp1);
336 writel(lli_dst->lcsp02, &lcpa[0].lcsp2);
337 writel(lli_dst->lcsp13, &lcpa[0].lcsp3);
338}
339
340void d40_log_lli_lcla_write(struct d40_log_lli *lcla,
341 struct d40_log_lli *lli_dst,
342 struct d40_log_lli *lli_src,
343 int next, unsigned int flags)
344{
345 d40_log_lli_link(lli_dst, lli_src, next, flags);
346
347 writel(lli_src->lcsp02, &lcla[0].lcsp02);
348 writel(lli_src->lcsp13, &lcla[0].lcsp13);
349 writel(lli_dst->lcsp02, &lcla[1].lcsp02);
350 writel(lli_dst->lcsp13, &lcla[1].lcsp13);
351}
352
353static void d40_log_fill_lli(struct d40_log_lli *lli,
354 dma_addr_t data, u32 data_size,
355 u32 reg_cfg,
356 u32 data_width,
357 unsigned int flags)
358{
359 bool addr_inc = flags & LLI_ADDR_INC;
360
361 lli->lcsp13 = reg_cfg;
362
363 /* The number of elements to transfer */
364 lli->lcsp02 = ((data_size >> data_width) <<
365 D40_MEM_LCSP0_ECNT_POS) & D40_MEM_LCSP0_ECNT_MASK;
366
367 BUG_ON((data_size >> data_width) > STEDMA40_MAX_SEG_SIZE);
368
369 /* 16 LSBs address of the current element */
370 lli->lcsp02 |= data & D40_MEM_LCSP0_SPTR_MASK;
371 /* 16 MSBs address of the current element */
372 lli->lcsp13 |= data & D40_MEM_LCSP1_SPTR_MASK;
373
374 if (addr_inc)
375 lli->lcsp13 |= D40_MEM_LCSP1_SCFG_INCR_MASK;
376
377}
378
379static struct d40_log_lli *d40_log_buf_to_lli(struct d40_log_lli *lli_sg,
380 dma_addr_t addr,
381 int size,
382 u32 lcsp13, /* src or dst*/
383 u32 data_width1,
384 u32 data_width2,
385 unsigned int flags)
386{
387 bool addr_inc = flags & LLI_ADDR_INC;
388 struct d40_log_lli *lli = lli_sg;
389 int size_rest = size;
390 int size_seg = 0;
391
392 do {
393 size_seg = d40_seg_size(size_rest, data_width1, data_width2);
394 size_rest -= size_seg;
395
396 d40_log_fill_lli(lli,
397 addr,
398 size_seg,
399 lcsp13, data_width1,
400 flags);
401 if (addr_inc)
402 addr += size_seg;
403 lli++;
404 } while (size_rest);
405
406 return lli;
407}
408
409int d40_log_sg_to_lli(struct scatterlist *sg,
410 int sg_len,
411 dma_addr_t dev_addr,
412 struct d40_log_lli *lli_sg,
413 u32 lcsp13, /* src or dst*/
414 u32 data_width1, u32 data_width2)
415{
416 int total_size = 0;
417 struct scatterlist *current_sg = sg;
418 int i;
419 struct d40_log_lli *lli = lli_sg;
420 unsigned long flags = 0;
421
422 if (!dev_addr)
423 flags |= LLI_ADDR_INC;
424
425 for_each_sg(sg, current_sg, sg_len, i) {
426 dma_addr_t sg_addr = sg_dma_address(current_sg);
427 unsigned int len = sg_dma_len(current_sg);
428 dma_addr_t addr = dev_addr ?: sg_addr;
429
430 total_size += sg_dma_len(current_sg);
431
432 lli = d40_log_buf_to_lli(lli, addr, len,
433 lcsp13,
434 data_width1,
435 data_width2,
436 flags);
437 }
438
439 return total_size;
440}