1 // SPDX-License-Identifier: (GPL-2.0 OR MIT)
2 /*
3  * Copyright (c) 2018 Synopsys, Inc. and/or its affiliates.
4  * stmmac XGMAC support.
5  */
6 
7 #include <linux/stmmac.h>
8 #include "common.h"
9 #include "dwxgmac2.h"
10 
11 static int dwxgmac2_get_tx_status(void *data, struct stmmac_extra_stats *x,
12 				  struct dma_desc *p, void __iomem *ioaddr)
13 {
14 	unsigned int tdes3 = le32_to_cpu(p->des3);
15 	int ret = tx_done;
16 
17 	if (unlikely(tdes3 & XGMAC_TDES3_OWN))
18 		return tx_dma_own;
19 	if (likely(!(tdes3 & XGMAC_TDES3_LD)))
20 		return tx_not_ls;
21 
22 	return ret;
23 }
24 
25 static int dwxgmac2_get_rx_status(void *data, struct stmmac_extra_stats *x,
26 				  struct dma_desc *p)
27 {
28 	unsigned int rdes3 = le32_to_cpu(p->des3);
29 
30 	if (unlikely(rdes3 & XGMAC_RDES3_OWN))
31 		return dma_own;
32 	if (unlikely(rdes3 & XGMAC_RDES3_CTXT))
33 		return discard_frame;
34 	if (likely(!(rdes3 & XGMAC_RDES3_LD)))
35 		return rx_not_ls;
36 	if (unlikely((rdes3 & XGMAC_RDES3_ES) && (rdes3 & XGMAC_RDES3_LD)))
37 		return discard_frame;
38 
39 	return good_frame;
40 }
41 
42 static int dwxgmac2_get_tx_len(struct dma_desc *p)
43 {
44 	return (le32_to_cpu(p->des2) & XGMAC_TDES2_B1L);
45 }
46 
47 static int dwxgmac2_get_tx_owner(struct dma_desc *p)
48 {
49 	return (le32_to_cpu(p->des3) & XGMAC_TDES3_OWN) > 0;
50 }
51 
52 static void dwxgmac2_set_tx_owner(struct dma_desc *p)
53 {
54 	p->des3 |= cpu_to_le32(XGMAC_TDES3_OWN);
55 }
56 
57 static void dwxgmac2_set_rx_owner(struct dma_desc *p, int disable_rx_ic)
58 {
59 	p->des3 |= cpu_to_le32(XGMAC_RDES3_OWN);
60 
61 	if (!disable_rx_ic)
62 		p->des3 |= cpu_to_le32(XGMAC_RDES3_IOC);
63 }
64 
65 static int dwxgmac2_get_tx_ls(struct dma_desc *p)
66 {
67 	return (le32_to_cpu(p->des3) & XGMAC_RDES3_LD) > 0;
68 }
69 
70 static int dwxgmac2_get_rx_frame_len(struct dma_desc *p, int rx_coe)
71 {
72 	return (le32_to_cpu(p->des3) & XGMAC_RDES3_PL);
73 }
74 
75 static void dwxgmac2_enable_tx_timestamp(struct dma_desc *p)
76 {
77 	p->des2 |= cpu_to_le32(XGMAC_TDES2_TTSE);
78 }
79 
80 static int dwxgmac2_get_tx_timestamp_status(struct dma_desc *p)
81 {
82 	return 0; /* Not supported */
83 }
84 
85 static inline void dwxgmac2_get_timestamp(void *desc, u32 ats, u64 *ts)
86 {
87 	struct dma_desc *p = (struct dma_desc *)desc;
88 	u64 ns = 0;
89 
90 	ns += le32_to_cpu(p->des1) * 1000000000ULL;
91 	ns += le32_to_cpu(p->des0);
92 
93 	*ts = ns;
94 }
95 
96 static int dwxgmac2_rx_check_timestamp(void *desc)
97 {
98 	struct dma_desc *p = (struct dma_desc *)desc;
99 	unsigned int rdes3 = le32_to_cpu(p->des3);
100 	bool desc_valid, ts_valid;
101 
102 	dma_rmb();
103 
104 	desc_valid = !(rdes3 & XGMAC_RDES3_OWN) && (rdes3 & XGMAC_RDES3_CTXT);
105 	ts_valid = !(rdes3 & XGMAC_RDES3_TSD) && (rdes3 & XGMAC_RDES3_TSA);
106 
107 	if (likely(desc_valid && ts_valid)) {
108 		if ((p->des0 == 0xffffffff) && (p->des1 == 0xffffffff))
109 			return -EINVAL;
110 		return 0;
111 	}
112 
113 	return -EINVAL;
114 }
115 
116 static int dwxgmac2_get_rx_timestamp_status(void *desc, void *next_desc,
117 					    u32 ats)
118 {
119 	struct dma_desc *p = (struct dma_desc *)desc;
120 	unsigned int rdes3 = le32_to_cpu(p->des3);
121 	int ret = -EBUSY;
122 
123 	if (likely(rdes3 & XGMAC_RDES3_CDA))
124 		ret = dwxgmac2_rx_check_timestamp(next_desc);
125 
126 	return !ret;
127 }
128 
129 static void dwxgmac2_init_rx_desc(struct dma_desc *p, int disable_rx_ic,
130 				  int mode, int end, int bfsize)
131 {
132 	dwxgmac2_set_rx_owner(p, disable_rx_ic);
133 }
134 
135 static void dwxgmac2_init_tx_desc(struct dma_desc *p, int mode, int end)
136 {
137 	p->des0 = 0;
138 	p->des1 = 0;
139 	p->des2 = 0;
140 	p->des3 = 0;
141 }
142 
143 static void dwxgmac2_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
144 				     bool csum_flag, int mode, bool tx_own,
145 				     bool ls, unsigned int tot_pkt_len)
146 {
147 	unsigned int tdes3 = le32_to_cpu(p->des3);
148 
149 	p->des2 |= cpu_to_le32(len & XGMAC_TDES2_B1L);
150 
151 	tdes3 |= tot_pkt_len & XGMAC_TDES3_FL;
152 	if (is_fs)
153 		tdes3 |= XGMAC_TDES3_FD;
154 	else
155 		tdes3 &= ~XGMAC_TDES3_FD;
156 
157 	if (csum_flag)
158 		tdes3 |= 0x3 << XGMAC_TDES3_CIC_SHIFT;
159 	else
160 		tdes3 &= ~XGMAC_TDES3_CIC;
161 
162 	if (ls)
163 		tdes3 |= XGMAC_TDES3_LD;
164 	else
165 		tdes3 &= ~XGMAC_TDES3_LD;
166 
167 	/* Finally set the OWN bit. Later the DMA will start! */
168 	if (tx_own)
169 		tdes3 |= XGMAC_TDES3_OWN;
170 
171 	if (is_fs && tx_own)
172 		/* When the own bit, for the first frame, has to be set, all
173 		 * descriptors for the same frame has to be set before, to
174 		 * avoid race condition.
175 		 */
176 		dma_wmb();
177 
178 	p->des3 = cpu_to_le32(tdes3);
179 }
180 
181 static void dwxgmac2_prepare_tso_tx_desc(struct dma_desc *p, int is_fs,
182 					 int len1, int len2, bool tx_own,
183 					 bool ls, unsigned int tcphdrlen,
184 					 unsigned int tcppayloadlen)
185 {
186 	unsigned int tdes3 = le32_to_cpu(p->des3);
187 
188 	if (len1)
189 		p->des2 |= cpu_to_le32(len1 & XGMAC_TDES2_B1L);
190 	if (len2)
191 		p->des2 |= cpu_to_le32((len2 << XGMAC_TDES2_B2L_SHIFT) &
192 				XGMAC_TDES2_B2L);
193 	if (is_fs) {
194 		tdes3 |= XGMAC_TDES3_FD | XGMAC_TDES3_TSE;
195 		tdes3 |= (tcphdrlen << XGMAC_TDES3_THL_SHIFT) &
196 			XGMAC_TDES3_THL;
197 		tdes3 |= tcppayloadlen & XGMAC_TDES3_TPL;
198 	} else {
199 		tdes3 &= ~XGMAC_TDES3_FD;
200 	}
201 
202 	if (ls)
203 		tdes3 |= XGMAC_TDES3_LD;
204 	else
205 		tdes3 &= ~XGMAC_TDES3_LD;
206 
207 	/* Finally set the OWN bit. Later the DMA will start! */
208 	if (tx_own)
209 		tdes3 |= XGMAC_TDES3_OWN;
210 
211 	if (is_fs && tx_own)
212 		/* When the own bit, for the first frame, has to be set, all
213 		 * descriptors for the same frame has to be set before, to
214 		 * avoid race condition.
215 		 */
216 		dma_wmb();
217 
218 	p->des3 = cpu_to_le32(tdes3);
219 }
220 
221 static void dwxgmac2_release_tx_desc(struct dma_desc *p, int mode)
222 {
223 	p->des0 = 0;
224 	p->des1 = 0;
225 	p->des2 = 0;
226 	p->des3 = 0;
227 }
228 
229 static void dwxgmac2_set_tx_ic(struct dma_desc *p)
230 {
231 	p->des2 |= cpu_to_le32(XGMAC_TDES2_IOC);
232 }
233 
234 static void dwxgmac2_set_mss(struct dma_desc *p, unsigned int mss)
235 {
236 	p->des0 = 0;
237 	p->des1 = 0;
238 	p->des2 = cpu_to_le32(mss);
239 	p->des3 = cpu_to_le32(XGMAC_TDES3_CTXT | XGMAC_TDES3_TCMSSV);
240 }
241 
242 static void dwxgmac2_get_addr(struct dma_desc *p, unsigned int *addr)
243 {
244 	*addr = le32_to_cpu(p->des0);
245 }
246 
247 static void dwxgmac2_set_addr(struct dma_desc *p, dma_addr_t addr)
248 {
249 	p->des0 = cpu_to_le32(lower_32_bits(addr));
250 	p->des1 = cpu_to_le32(upper_32_bits(addr));
251 }
252 
253 static void dwxgmac2_clear(struct dma_desc *p)
254 {
255 	p->des0 = 0;
256 	p->des1 = 0;
257 	p->des2 = 0;
258 	p->des3 = 0;
259 }
260 
261 static int dwxgmac2_get_rx_hash(struct dma_desc *p, u32 *hash,
262 				enum pkt_hash_types *type)
263 {
264 	unsigned int rdes3 = le32_to_cpu(p->des3);
265 	u32 ptype;
266 
267 	if (rdes3 & XGMAC_RDES3_RSV) {
268 		ptype = (rdes3 & XGMAC_RDES3_L34T) >> XGMAC_RDES3_L34T_SHIFT;
269 
270 		switch (ptype) {
271 		case XGMAC_L34T_IP4TCP:
272 		case XGMAC_L34T_IP4UDP:
273 		case XGMAC_L34T_IP6TCP:
274 		case XGMAC_L34T_IP6UDP:
275 			*type = PKT_HASH_TYPE_L4;
276 			break;
277 		default:
278 			*type = PKT_HASH_TYPE_L3;
279 			break;
280 		}
281 
282 		*hash = le32_to_cpu(p->des1);
283 		return 0;
284 	}
285 
286 	return -EINVAL;
287 }
288 
289 static void dwxgmac2_get_rx_header_len(struct dma_desc *p, unsigned int *len)
290 {
291 	if (le32_to_cpu(p->des3) & XGMAC_RDES3_L34T)
292 		*len = le32_to_cpu(p->des2) & XGMAC_RDES2_HL;
293 }
294 
295 static void dwxgmac2_set_sec_addr(struct dma_desc *p, dma_addr_t addr, bool is_valid)
296 {
297 	p->des2 = cpu_to_le32(lower_32_bits(addr));
298 	p->des3 = cpu_to_le32(upper_32_bits(addr));
299 }
300 
301 static void dwxgmac2_set_sarc(struct dma_desc *p, u32 sarc_type)
302 {
303 	sarc_type <<= XGMAC_TDES3_SAIC_SHIFT;
304 
305 	p->des3 |= cpu_to_le32(sarc_type & XGMAC_TDES3_SAIC);
306 }
307 
308 static void dwxgmac2_set_vlan_tag(struct dma_desc *p, u16 tag, u16 inner_tag,
309 				  u32 inner_type)
310 {
311 	p->des0 = 0;
312 	p->des1 = 0;
313 	p->des2 = 0;
314 	p->des3 = 0;
315 
316 	/* Inner VLAN */
317 	if (inner_type) {
318 		u32 des = inner_tag << XGMAC_TDES2_IVT_SHIFT;
319 
320 		des &= XGMAC_TDES2_IVT;
321 		p->des2 = cpu_to_le32(des);
322 
323 		des = inner_type << XGMAC_TDES3_IVTIR_SHIFT;
324 		des &= XGMAC_TDES3_IVTIR;
325 		p->des3 = cpu_to_le32(des | XGMAC_TDES3_IVLTV);
326 	}
327 
328 	/* Outer VLAN */
329 	p->des3 |= cpu_to_le32(tag & XGMAC_TDES3_VT);
330 	p->des3 |= cpu_to_le32(XGMAC_TDES3_VLTV);
331 
332 	p->des3 |= cpu_to_le32(XGMAC_TDES3_CTXT);
333 }
334 
335 static void dwxgmac2_set_vlan(struct dma_desc *p, u32 type)
336 {
337 	type <<= XGMAC_TDES2_VTIR_SHIFT;
338 	p->des2 |= cpu_to_le32(type & XGMAC_TDES2_VTIR);
339 }
340 
341 static void dwxgmac2_set_tbs(struct dma_edesc *p, u32 sec, u32 nsec)
342 {
343 	p->des4 = cpu_to_le32((sec & XGMAC_TDES0_LT) | XGMAC_TDES0_LTV);
344 	p->des5 = cpu_to_le32(nsec & XGMAC_TDES1_LT);
345 	p->des6 = 0;
346 	p->des7 = 0;
347 }
348 
349 const struct stmmac_desc_ops dwxgmac210_desc_ops = {
350 	.tx_status = dwxgmac2_get_tx_status,
351 	.rx_status = dwxgmac2_get_rx_status,
352 	.get_tx_len = dwxgmac2_get_tx_len,
353 	.get_tx_owner = dwxgmac2_get_tx_owner,
354 	.set_tx_owner = dwxgmac2_set_tx_owner,
355 	.set_rx_owner = dwxgmac2_set_rx_owner,
356 	.get_tx_ls = dwxgmac2_get_tx_ls,
357 	.get_rx_frame_len = dwxgmac2_get_rx_frame_len,
358 	.enable_tx_timestamp = dwxgmac2_enable_tx_timestamp,
359 	.get_tx_timestamp_status = dwxgmac2_get_tx_timestamp_status,
360 	.get_rx_timestamp_status = dwxgmac2_get_rx_timestamp_status,
361 	.get_timestamp = dwxgmac2_get_timestamp,
362 	.set_tx_ic = dwxgmac2_set_tx_ic,
363 	.prepare_tx_desc = dwxgmac2_prepare_tx_desc,
364 	.prepare_tso_tx_desc = dwxgmac2_prepare_tso_tx_desc,
365 	.release_tx_desc = dwxgmac2_release_tx_desc,
366 	.init_rx_desc = dwxgmac2_init_rx_desc,
367 	.init_tx_desc = dwxgmac2_init_tx_desc,
368 	.set_mss = dwxgmac2_set_mss,
369 	.get_addr = dwxgmac2_get_addr,
370 	.set_addr = dwxgmac2_set_addr,
371 	.clear = dwxgmac2_clear,
372 	.get_rx_hash = dwxgmac2_get_rx_hash,
373 	.get_rx_header_len = dwxgmac2_get_rx_header_len,
374 	.set_sec_addr = dwxgmac2_set_sec_addr,
375 	.set_sarc = dwxgmac2_set_sarc,
376 	.set_vlan_tag = dwxgmac2_set_vlan_tag,
377 	.set_vlan = dwxgmac2_set_vlan,
378 	.set_tbs = dwxgmac2_set_tbs,
379 };
380