1 // SPDX-License-Identifier: GPL-2.0-only
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
8 #include <linux/kernel.h>
9 #include <linux/platform_data/dma-ste-dma40.h>
11 #include "ste_dma40_ll.h"
13 static u8 d40_width_to_bits(enum dma_slave_buswidth width)
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;
22 return STEDMA40_ESIZE_32_BIT;
25 /* Sets up proper LCSP1 and LCSP3 register for a logical channel */
26 void d40_log_cfg(struct stedma40_chan_cfg *cfg,
27 u32 *lcsp1, u32 *lcsp3)
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);
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);
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);
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);
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;
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;
67 void d40_phy_cfg(struct stedma40_chan_cfg *cfg, u32 *src_cfg, u32 *dst_cfg)
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);
78 if (cfg->src_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL)
79 src |= BIT(D40_SREG_CFG_PHY_TM_POS);
81 src |= 3 << D40_SREG_CFG_PHY_TM_POS;
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);
89 if (cfg->dst_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL)
90 dst |= BIT(D40_SREG_CFG_PHY_TM_POS);
92 dst |= 3 << D40_SREG_CFG_PHY_TM_POS;
94 /* Interrupt on end of transfer for destination */
95 dst |= BIT(D40_SREG_CFG_TIM_POS);
97 /* Generate interrupt on error */
98 src |= BIT(D40_SREG_CFG_EIM_POS);
99 dst |= BIT(D40_SREG_CFG_EIM_POS);
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;
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;
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;
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);
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);
132 static int d40_phy_fill_lli(struct d40_phy_lli *lli,
137 struct stedma40_half_channel_info *info,
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;
146 if (psize == STEDMA40_PSIZE_PHY_1)
149 num_elems = 2 << psize;
151 /* Must be aligned */
152 if (!IS_ALIGNED(data, data_width))
155 /* Transfer size can't be smaller than (num_elms * elem_size) */
156 if (data_size < num_elems * data_width)
159 /* The number of elements. IE now many chunks */
160 lli->reg_elt = (data_size / data_width) << D40_SREG_ELEM_PHY_ECNT_POS;
163 * Distance to next element sized entry.
164 * Usually the size of the element unless you want gaps.
167 lli->reg_elt |= data_width << D40_SREG_ELEM_PHY_EIDX_POS;
169 /* Where the data is */
171 lli->reg_cfg = reg_cfg;
173 /* If this scatter list entry is the last one, no next link */
175 lli->reg_lnk = BIT(D40_SREG_LNK_PHY_TCP_POS);
177 lli->reg_lnk = next_lli;
179 /* Set/clear interrupt generation on this link item.*/
181 lli->reg_cfg |= BIT(D40_SREG_CFG_TIM_POS);
183 lli->reg_cfg &= ~BIT(D40_SREG_CFG_TIM_POS);
186 * Post link - D40_SREG_LNK_PHY_PRE_POS = 0
187 * Relink happens after transfer completion.
193 static int d40_seg_size(int size, int data_width1, int data_width2)
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);
199 if (seg_max > STEDMA40_MAX_SEG_SIZE)
205 if (size <= 2 * seg_max)
206 return ALIGN(size / 2, max_w);
211 static struct d40_phy_lli *
212 d40_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,
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;
223 dma_addr_t next = lli_phys;
224 int size_rest = size;
228 * This piece may be split up based on d40_seg_size(); we only want the
229 * term int on the last part.
232 flags &= ~LLI_TERM_INT;
235 size_seg = d40_seg_size(size_rest, info->data_width,
236 otherinfo->data_width);
237 size_rest -= size_seg;
239 if (size_rest == 0 && term_int)
240 flags |= LLI_TERM_INT;
242 if (size_rest == 0 && lastlink)
243 next = cyclic ? first_phys : 0;
245 next = ALIGN(next + sizeof(struct d40_phy_lli),
248 err = d40_phy_fill_lli(lli, addr, size_seg, next,
249 reg_cfg, info, flags);
265 int d40_phy_sg_to_lli(struct scatterlist *sg,
268 struct d40_phy_lli *lli_sg,
271 struct stedma40_half_channel_info *info,
272 struct stedma40_half_channel_info *otherinfo,
277 struct scatterlist *current_sg = sg;
278 struct d40_phy_lli *lli = lli_sg;
279 dma_addr_t l_phys = lli_phys;
282 flags |= LLI_ADDR_INC;
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;
289 total_size += sg_dma_len(current_sg);
292 flags |= LLI_TERM_INT | LLI_LAST_LINK;
294 l_phys = ALIGN(lli_phys + (lli - lli_sg) *
295 sizeof(struct d40_phy_lli), D40_LLI_ALIGN);
297 lli = d40_phy_buf_to_lli(lli, dst, len, l_phys, lli_phys,
298 reg_cfg, info, otherinfo, flags);
308 /* DMA logical lli operations */
310 static void d40_log_lli_link(struct d40_log_lli *lli_dst,
311 struct d40_log_lli *lli_src,
312 int next, unsigned int flags)
314 bool interrupt = flags & LLI_TERM_INT;
318 if (next != -EINVAL) {
324 lli_dst->lcsp13 |= D40_MEM_LCSP1_SCFG_TIM_MASK;
325 lli_dst->lcsp13 |= D40_MEM_LCSP3_DTCP_MASK;
328 lli_src->lcsp13 = (lli_src->lcsp13 & ~D40_MEM_LCSP1_SLOS_MASK) |
329 (slos << D40_MEM_LCSP1_SLOS_POS);
331 lli_dst->lcsp13 = (lli_dst->lcsp13 & ~D40_MEM_LCSP1_SLOS_MASK) |
332 (dlos << D40_MEM_LCSP1_SLOS_POS);
335 void 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)
340 d40_log_lli_link(lli_dst, lli_src, next, flags);
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);
348 void 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)
353 d40_log_lli_link(lli_dst, lli_src, next, flags);
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);
361 static void d40_log_fill_lli(struct d40_log_lli *lli,
362 dma_addr_t data, u32 data_size,
367 bool addr_inc = flags & LLI_ADDR_INC;
369 lli->lcsp13 = reg_cfg;
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;
375 BUG_ON((data_size / data_width) > STEDMA40_MAX_SEG_SIZE);
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;
383 lli->lcsp13 |= D40_MEM_LCSP1_SCFG_INCR_MASK;
387 static struct d40_log_lli *d40_log_buf_to_lli(struct d40_log_lli *lli_sg,
390 u32 lcsp13, /* src or dst*/
395 bool addr_inc = flags & LLI_ADDR_INC;
396 struct d40_log_lli *lli = lli_sg;
397 int size_rest = size;
401 size_seg = d40_seg_size(size_rest, data_width1, data_width2);
402 size_rest -= size_seg;
404 d40_log_fill_lli(lli,
417 int d40_log_sg_to_lli(struct scatterlist *sg,
420 struct d40_log_lli *lli_sg,
421 u32 lcsp13, /* src or dst*/
422 u32 data_width1, u32 data_width2)
425 struct scatterlist *current_sg = sg;
427 struct d40_log_lli *lli = lli_sg;
428 unsigned long flags = 0;
431 flags |= LLI_ADDR_INC;
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;
438 total_size += sg_dma_len(current_sg);
440 lli = d40_log_buf_to_lli(lli, addr, len,