1// SPDX-License-Identifier: GPL-2.0+
2/* Microchip Sparx5 Switch driver
3 *
4 * Copyright (c) 2023 Microchip Technology Inc. and its subsidiaries.
5 */
6
7#include "sparx5_main_regs.h"
8#include "sparx5_main.h"
9
10struct sparx5_sdlb_group sdlb_groups[SPX5_SDLB_GROUP_CNT] = {
11 { SPX5_SDLB_GROUP_RATE_MAX, 8192 / 1, 64 }, /* 25 G */
12 { 15000000000ULL, 8192 / 1, 64 }, /* 15 G */
13 { 10000000000ULL, 8192 / 1, 64 }, /* 10 G */
14 { 5000000000ULL, 8192 / 1, 64 }, /* 5 G */
15 { 2500000000ULL, 8192 / 1, 64 }, /* 2.5 G */
16 { 1000000000ULL, 8192 / 2, 64 }, /* 1 G */
17 { 500000000ULL, 8192 / 2, 64 }, /* 500 M */
18 { 100000000ULL, 8192 / 4, 64 }, /* 100 M */
19 { 50000000ULL, 8192 / 4, 64 }, /* 50 M */
20 { 5000000ULL, 8192 / 8, 64 } /* 5 M */
21};
22
23int sparx5_sdlb_clk_hz_get(struct sparx5 *sparx5)
24{
25 u32 clk_per_100ps;
26 u64 clk_hz;
27
28 clk_per_100ps = HSCH_SYS_CLK_PER_100PS_GET(spx5_rd(sparx5,
29 HSCH_SYS_CLK_PER));
30 if (!clk_per_100ps)
31 clk_per_100ps = SPX5_CLK_PER_100PS_DEFAULT;
32
33 clk_hz = (10 * 1000 * 1000) / clk_per_100ps;
34 return clk_hz *= 1000;
35}
36
37static int sparx5_sdlb_pup_interval_get(struct sparx5 *sparx5, u32 max_token,
38 u64 max_rate)
39{
40 u64 clk_hz;
41
42 clk_hz = sparx5_sdlb_clk_hz_get(sparx5);
43
44 return div64_u64(dividend: (8 * clk_hz * max_token), divisor: max_rate);
45}
46
47int sparx5_sdlb_pup_token_get(struct sparx5 *sparx5, u32 pup_interval, u64 rate)
48{
49 u64 clk_hz;
50
51 if (!rate)
52 return SPX5_SDLB_PUP_TOKEN_DISABLE;
53
54 clk_hz = sparx5_sdlb_clk_hz_get(sparx5);
55
56 return DIV64_U64_ROUND_UP((rate * pup_interval), (clk_hz * 8));
57}
58
59static void sparx5_sdlb_group_disable(struct sparx5 *sparx5, u32 group)
60{
61 spx5_rmw(ANA_AC_SDLB_PUP_CTRL_PUP_ENA_SET(0),
62 ANA_AC_SDLB_PUP_CTRL_PUP_ENA, sparx5,
63 ANA_AC_SDLB_PUP_CTRL(group));
64}
65
66static void sparx5_sdlb_group_enable(struct sparx5 *sparx5, u32 group)
67{
68 spx5_rmw(ANA_AC_SDLB_PUP_CTRL_PUP_ENA_SET(1),
69 ANA_AC_SDLB_PUP_CTRL_PUP_ENA, sparx5,
70 ANA_AC_SDLB_PUP_CTRL(group));
71}
72
73static u32 sparx5_sdlb_group_get_first(struct sparx5 *sparx5, u32 group)
74{
75 u32 val;
76
77 val = spx5_rd(sparx5, ANA_AC_SDLB_XLB_START(group));
78
79 return ANA_AC_SDLB_XLB_START_LBSET_START_GET(val);
80}
81
82static u32 sparx5_sdlb_group_get_next(struct sparx5 *sparx5, u32 group,
83 u32 lb)
84{
85 u32 val;
86
87 val = spx5_rd(sparx5, ANA_AC_SDLB_XLB_NEXT(lb));
88
89 return ANA_AC_SDLB_XLB_NEXT_LBSET_NEXT_GET(val);
90}
91
92static bool sparx5_sdlb_group_is_first(struct sparx5 *sparx5, u32 group,
93 u32 lb)
94{
95 return lb == sparx5_sdlb_group_get_first(sparx5, group);
96}
97
98static bool sparx5_sdlb_group_is_last(struct sparx5 *sparx5, u32 group,
99 u32 lb)
100{
101 return lb == sparx5_sdlb_group_get_next(sparx5, group, lb);
102}
103
104static bool sparx5_sdlb_group_is_empty(struct sparx5 *sparx5, u32 group)
105{
106 u32 val;
107
108 val = spx5_rd(sparx5, ANA_AC_SDLB_PUP_CTRL(group));
109
110 return ANA_AC_SDLB_PUP_CTRL_PUP_ENA_GET(val) == 0;
111}
112
113static u32 sparx5_sdlb_group_get_last(struct sparx5 *sparx5, u32 group)
114{
115 u32 itr, next;
116
117 itr = sparx5_sdlb_group_get_first(sparx5, group);
118
119 for (;;) {
120 next = sparx5_sdlb_group_get_next(sparx5, group, lb: itr);
121 if (itr == next)
122 return itr;
123
124 itr = next;
125 }
126}
127
128static bool sparx5_sdlb_group_is_singular(struct sparx5 *sparx5, u32 group)
129{
130 if (sparx5_sdlb_group_is_empty(sparx5, group))
131 return false;
132
133 return sparx5_sdlb_group_get_first(sparx5, group) ==
134 sparx5_sdlb_group_get_last(sparx5, group);
135}
136
137static int sparx5_sdlb_group_get_adjacent(struct sparx5 *sparx5, u32 group,
138 u32 idx, u32 *prev, u32 *next,
139 u32 *first)
140{
141 u32 itr;
142
143 *first = sparx5_sdlb_group_get_first(sparx5, group);
144 *prev = *first;
145 *next = *first;
146 itr = *first;
147
148 for (;;) {
149 *next = sparx5_sdlb_group_get_next(sparx5, group, lb: itr);
150
151 if (itr == idx)
152 return 0; /* Found it */
153
154 if (itr == *next)
155 return -EINVAL; /* Was not found */
156
157 *prev = itr;
158 itr = *next;
159 }
160}
161
162static int sparx5_sdlb_group_get_count(struct sparx5 *sparx5, u32 group)
163{
164 u32 itr, next;
165 int count = 0;
166
167 itr = sparx5_sdlb_group_get_first(sparx5, group);
168
169 for (;;) {
170 next = sparx5_sdlb_group_get_next(sparx5, group, lb: itr);
171 if (itr == next)
172 return count;
173
174 itr = next;
175 count++;
176 }
177}
178
179int sparx5_sdlb_group_get_by_rate(struct sparx5 *sparx5, u32 rate, u32 burst)
180{
181 const struct sparx5_sdlb_group *group;
182 u64 rate_bps;
183 int i, count;
184
185 rate_bps = rate * 1000;
186
187 for (i = SPX5_SDLB_GROUP_CNT - 1; i >= 0; i--) {
188 group = &sdlb_groups[i];
189
190 count = sparx5_sdlb_group_get_count(sparx5, group: i);
191
192 /* Check that this group is not full.
193 * According to LB group configuration rules: the number of XLBs
194 * in a group must not exceed PUP_INTERVAL/4 - 1.
195 */
196 if (count > ((group->pup_interval / 4) - 1))
197 continue;
198
199 if (rate_bps < group->max_rate)
200 return i;
201 }
202
203 return -ENOSPC;
204}
205
206int sparx5_sdlb_group_get_by_index(struct sparx5 *sparx5, u32 idx, u32 *group)
207{
208 u32 itr, next;
209 int i;
210
211 for (i = 0; i < SPX5_SDLB_GROUP_CNT; i++) {
212 if (sparx5_sdlb_group_is_empty(sparx5, group: i))
213 continue;
214
215 itr = sparx5_sdlb_group_get_first(sparx5, group: i);
216
217 for (;;) {
218 next = sparx5_sdlb_group_get_next(sparx5, group: i, lb: itr);
219
220 if (itr == idx) {
221 *group = i;
222 return 0; /* Found it */
223 }
224 if (itr == next)
225 break; /* Was not found */
226
227 itr = next;
228 }
229 }
230
231 return -EINVAL;
232}
233
234static int sparx5_sdlb_group_link(struct sparx5 *sparx5, u32 group, u32 idx,
235 u32 first, u32 next, bool empty)
236{
237 /* Stop leaking */
238 sparx5_sdlb_group_disable(sparx5, group);
239
240 if (empty)
241 return 0;
242
243 /* Link insertion lb to next lb */
244 spx5_wr(ANA_AC_SDLB_XLB_NEXT_LBSET_NEXT_SET(next) |
245 ANA_AC_SDLB_XLB_NEXT_LBGRP_SET(group),
246 sparx5, ANA_AC_SDLB_XLB_NEXT(idx));
247
248 /* Set the first lb */
249 spx5_wr(ANA_AC_SDLB_XLB_START_LBSET_START_SET(first), sparx5,
250 ANA_AC_SDLB_XLB_START(group));
251
252 /* Start leaking */
253 sparx5_sdlb_group_enable(sparx5, group);
254
255 return 0;
256};
257
258int sparx5_sdlb_group_add(struct sparx5 *sparx5, u32 group, u32 idx)
259{
260 u32 first, next;
261
262 /* We always add to head of the list */
263 first = idx;
264
265 if (sparx5_sdlb_group_is_empty(sparx5, group))
266 next = idx;
267 else
268 next = sparx5_sdlb_group_get_first(sparx5, group);
269
270 return sparx5_sdlb_group_link(sparx5, group, idx, first, next, empty: false);
271}
272
273int sparx5_sdlb_group_del(struct sparx5 *sparx5, u32 group, u32 idx)
274{
275 u32 first, next, prev;
276 bool empty = false;
277
278 if (sparx5_sdlb_group_get_adjacent(sparx5, group, idx, prev: &prev, next: &next,
279 first: &first) < 0) {
280 pr_err("%s:%d Could not find idx: %d in group: %d", __func__,
281 __LINE__, idx, group);
282 return -EINVAL;
283 }
284
285 if (sparx5_sdlb_group_is_singular(sparx5, group)) {
286 empty = true;
287 } else if (sparx5_sdlb_group_is_last(sparx5, group, lb: idx)) {
288 /* idx is removed, prev is now last */
289 idx = prev;
290 next = prev;
291 } else if (sparx5_sdlb_group_is_first(sparx5, group, lb: idx)) {
292 /* idx is removed and points to itself, first is next */
293 first = next;
294 next = idx;
295 } else {
296 /* Next is not touched */
297 idx = prev;
298 }
299
300 return sparx5_sdlb_group_link(sparx5, group, idx, first, next, empty);
301}
302
303void sparx5_sdlb_group_init(struct sparx5 *sparx5, u64 max_rate, u32 min_burst,
304 u32 frame_size, u32 idx)
305{
306 u32 thres_shift, mask = 0x01, power = 0;
307 struct sparx5_sdlb_group *group;
308 u64 max_token;
309
310 group = &sdlb_groups[idx];
311
312 /* Number of positions to right-shift LB's threshold value. */
313 while ((min_burst & mask) == 0) {
314 power++;
315 mask <<= 1;
316 }
317 thres_shift = SPX5_SDLB_2CYCLES_TYPE2_THRES_OFFSET - power;
318
319 max_token = (min_burst > SPX5_SDLB_PUP_TOKEN_MAX) ?
320 SPX5_SDLB_PUP_TOKEN_MAX :
321 min_burst;
322 group->pup_interval =
323 sparx5_sdlb_pup_interval_get(sparx5, max_token, max_rate);
324
325 group->frame_size = frame_size;
326
327 spx5_wr(ANA_AC_SDLB_PUP_INTERVAL_PUP_INTERVAL_SET(group->pup_interval),
328 sparx5, ANA_AC_SDLB_PUP_INTERVAL(idx));
329
330 spx5_wr(ANA_AC_SDLB_FRM_RATE_TOKENS_FRM_RATE_TOKENS_SET(frame_size),
331 sparx5, ANA_AC_SDLB_FRM_RATE_TOKENS(idx));
332
333 spx5_wr(ANA_AC_SDLB_LBGRP_MISC_THRES_SHIFT_SET(thres_shift), sparx5,
334 ANA_AC_SDLB_LBGRP_MISC(idx));
335}
336

source code of linux/drivers/net/ethernet/microchip/sparx5/sparx5_sdlb.c