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
8 #include <linux/kernel.h>
9 #include <plat/ste_dma40.h>
11 #include "ste_dma40_ll.h"
13 /* Sets up proper LCSP1 and LCSP3 register for a logical channel */
14 void d40_log_cfg(struct stedma40_chan_cfg *cfg,
15 u32 *lcsp1, u32 *lcsp3)
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;
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;
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;
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;
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;
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;
53 /* Sets up SRC and DST CFG register for both logical and physical channels */
54 void d40_phy_cfg(struct stedma40_chan_cfg *cfg,
55 u32 *src_cfg, u32 *dst_cfg, bool 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);
68 if (cfg->src_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL)
69 src |= 1 << D40_SREG_CFG_PHY_TM_POS;
71 src |= 3 << D40_SREG_CFG_PHY_TM_POS;
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);
79 if (cfg->dst_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL)
80 dst |= 1 << D40_SREG_CFG_PHY_TM_POS;
82 dst |= 3 << D40_SREG_CFG_PHY_TM_POS;
84 /* Interrupt on end of transfer for destination */
85 dst |= 1 << D40_SREG_CFG_TIM_POS;
87 /* Generate interrupt on error */
88 src |= 1 << D40_SREG_CFG_EIM_POS;
89 dst |= 1 << D40_SREG_CFG_EIM_POS;
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;
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;
102 src |= cfg->src_info.data_width << D40_SREG_CFG_ESIZE_POS;
103 dst |= cfg->dst_info.data_width << D40_SREG_CFG_ESIZE_POS;
106 /* Logical channel */
107 dst |= 1 << D40_SREG_CFG_LOG_GIM_POS;
108 src |= 1 << D40_SREG_CFG_LOG_GIM_POS;
111 if (cfg->high_priority) {
112 src |= 1 << D40_SREG_CFG_PRI_POS;
113 dst |= 1 << D40_SREG_CFG_PRI_POS;
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;
125 static int d40_phy_fill_lli(struct d40_phy_lli *lli,
130 struct stedma40_half_channel_info *info,
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;
139 if (psize == STEDMA40_PSIZE_PHY_1)
142 num_elems = 2 << psize;
144 /* Must be aligned */
145 if (!IS_ALIGNED(data, 0x1 << data_width))
148 /* Transfer size can't be smaller than (num_elms * elem_size) */
149 if (data_size < num_elems * (0x1 << data_width))
152 /* The number of elements. IE now many chunks */
153 lli->reg_elt = (data_size >> data_width) << D40_SREG_ELEM_PHY_ECNT_POS;
156 * Distance to next element sized entry.
157 * Usually the size of the element unless you want gaps.
160 lli->reg_elt |= (0x1 << data_width) <<
161 D40_SREG_ELEM_PHY_EIDX_POS;
163 /* Where the data is */
165 lli->reg_cfg = reg_cfg;
167 /* If this scatter list entry is the last one, no next link */
169 lli->reg_lnk = 0x1 << D40_SREG_LNK_PHY_TCP_POS;
171 lli->reg_lnk = next_lli;
173 /* Set/clear interrupt generation on this link item.*/
175 lli->reg_cfg |= 0x1 << D40_SREG_CFG_TIM_POS;
177 lli->reg_cfg &= ~(0x1 << D40_SREG_CFG_TIM_POS);
180 lli->reg_lnk |= 0 << D40_SREG_LNK_PHY_PRE_POS;
185 static int d40_seg_size(int size, int data_width1, int data_width2)
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);
191 if (seg_max > STEDMA40_MAX_SEG_SIZE)
192 seg_max -= (1 << max_w);
197 if (size <= 2 * seg_max)
198 return ALIGN(size / 2, 1 << max_w);
203 static struct d40_phy_lli *
204 d40_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,
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;
215 dma_addr_t next = lli_phys;
216 int size_rest = size;
220 * This piece may be split up based on d40_seg_size(); we only want the
221 * term int on the last part.
224 flags &= ~LLI_TERM_INT;
227 size_seg = d40_seg_size(size_rest, info->data_width,
228 otherinfo->data_width);
229 size_rest -= size_seg;
231 if (size_rest == 0 && term_int)
232 flags |= LLI_TERM_INT;
234 if (size_rest == 0 && lastlink)
235 next = cyclic ? first_phys : 0;
237 next = ALIGN(next + sizeof(struct d40_phy_lli),
240 err = d40_phy_fill_lli(lli, addr, size_seg, next,
241 reg_cfg, info, flags);
257 int d40_phy_sg_to_lli(struct scatterlist *sg,
260 struct d40_phy_lli *lli_sg,
263 struct stedma40_half_channel_info *info,
264 struct stedma40_half_channel_info *otherinfo,
269 struct scatterlist *current_sg = sg;
270 struct d40_phy_lli *lli = lli_sg;
271 dma_addr_t l_phys = lli_phys;
274 flags |= LLI_ADDR_INC;
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;
281 total_size += sg_dma_len(current_sg);
284 flags |= LLI_TERM_INT | LLI_LAST_LINK;
286 l_phys = ALIGN(lli_phys + (lli - lli_sg) *
287 sizeof(struct d40_phy_lli), D40_LLI_ALIGN);
289 lli = d40_phy_buf_to_lli(lli, dst, len, l_phys, lli_phys,
290 reg_cfg, info, otherinfo, flags);
300 /* DMA logical lli operations */
302 static void d40_log_lli_link(struct d40_log_lli *lli_dst,
303 struct d40_log_lli *lli_src,
304 int next, unsigned int flags)
306 bool interrupt = flags & LLI_TERM_INT;
310 if (next != -EINVAL) {
316 lli_dst->lcsp13 |= D40_MEM_LCSP1_SCFG_TIM_MASK;
317 lli_dst->lcsp13 |= D40_MEM_LCSP3_DTCP_MASK;
320 lli_src->lcsp13 = (lli_src->lcsp13 & ~D40_MEM_LCSP1_SLOS_MASK) |
321 (slos << D40_MEM_LCSP1_SLOS_POS);
323 lli_dst->lcsp13 = (lli_dst->lcsp13 & ~D40_MEM_LCSP1_SLOS_MASK) |
324 (dlos << D40_MEM_LCSP1_SLOS_POS);
327 void 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)
332 d40_log_lli_link(lli_dst, lli_src, next, flags);
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);
340 void 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)
345 d40_log_lli_link(lli_dst, lli_src, next, flags);
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);
353 static void d40_log_fill_lli(struct d40_log_lli *lli,
354 dma_addr_t data, u32 data_size,
359 bool addr_inc = flags & LLI_ADDR_INC;
361 lli->lcsp13 = reg_cfg;
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;
367 BUG_ON((data_size >> data_width) > STEDMA40_MAX_SEG_SIZE);
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;
375 lli->lcsp13 |= D40_MEM_LCSP1_SCFG_INCR_MASK;
379 static struct d40_log_lli *d40_log_buf_to_lli(struct d40_log_lli *lli_sg,
382 u32 lcsp13, /* src or dst*/
387 bool addr_inc = flags & LLI_ADDR_INC;
388 struct d40_log_lli *lli = lli_sg;
389 int size_rest = size;
393 size_seg = d40_seg_size(size_rest, data_width1, data_width2);
394 size_rest -= size_seg;
396 d40_log_fill_lli(lli,
409 int d40_log_sg_to_lli(struct scatterlist *sg,
412 struct d40_log_lli *lli_sg,
413 u32 lcsp13, /* src or dst*/
414 u32 data_width1, u32 data_width2)
417 struct scatterlist *current_sg = sg;
419 struct d40_log_lli *lli = lli_sg;
420 unsigned long flags = 0;
423 flags |= LLI_ADDR_INC;
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;
430 total_size += sg_dma_len(current_sg);
432 lli = d40_log_buf_to_lli(lli, addr, len,