1// SPDX-License-Identifier: GPL-2.0
2/*
3 * XGE PCSR module initialisation
4 *
5 * Copyright (C) 2014 Texas Instruments Incorporated
6 * Authors: Sandeep Nair <sandeep_n@ti.com>
7 * WingMan Kwok <w-kwok2@ti.com>
8 *
9 */
10#include "netcp.h"
11
12/* XGBE registers */
13#define XGBE_CTRL_OFFSET 0x0c
14#define XGBE_SGMII_1_OFFSET 0x0114
15#define XGBE_SGMII_2_OFFSET 0x0214
16
17/* PCS-R registers */
18#define PCSR_CPU_CTRL_OFFSET 0x1fd0
19#define POR_EN BIT(29)
20
21#define reg_rmw(addr, value, mask) \
22 writel(((readl(addr) & (~(mask))) | \
23 (value & (mask))), (addr))
24
25/* bit mask of width w at offset s */
26#define MASK_WID_SH(w, s) (((1 << w) - 1) << s)
27
28/* shift value v to offset s */
29#define VAL_SH(v, s) (v << s)
30
31#define PHY_A(serdes) 0
32
33struct serdes_cfg {
34 u32 ofs;
35 u32 val;
36 u32 mask;
37};
38
39static struct serdes_cfg cfg_phyb_1p25g_156p25mhz_cmu0[] = {
40 {0x0000, 0x00800002, 0x00ff00ff},
41 {0x0014, 0x00003838, 0x0000ffff},
42 {0x0060, 0x1c44e438, 0xffffffff},
43 {0x0064, 0x00c18400, 0x00ffffff},
44 {0x0068, 0x17078200, 0xffffff00},
45 {0x006c, 0x00000014, 0x000000ff},
46 {0x0078, 0x0000c000, 0x0000ff00},
47 {0x0000, 0x00000003, 0x000000ff},
48};
49
50static struct serdes_cfg cfg_phyb_10p3125g_156p25mhz_cmu1[] = {
51 {0x0c00, 0x00030002, 0x00ff00ff},
52 {0x0c14, 0x00005252, 0x0000ffff},
53 {0x0c28, 0x80000000, 0xff000000},
54 {0x0c2c, 0x000000f6, 0x000000ff},
55 {0x0c3c, 0x04000405, 0xff00ffff},
56 {0x0c40, 0xc0800000, 0xffff0000},
57 {0x0c44, 0x5a202062, 0xffffffff},
58 {0x0c48, 0x40040424, 0xffffffff},
59 {0x0c4c, 0x00004002, 0x0000ffff},
60 {0x0c50, 0x19001c00, 0xff00ff00},
61 {0x0c54, 0x00002100, 0x0000ff00},
62 {0x0c58, 0x00000060, 0x000000ff},
63 {0x0c60, 0x80131e7c, 0xffffffff},
64 {0x0c64, 0x8400cb02, 0xff00ffff},
65 {0x0c68, 0x17078200, 0xffffff00},
66 {0x0c6c, 0x00000016, 0x000000ff},
67 {0x0c74, 0x00000400, 0x0000ff00},
68 {0x0c78, 0x0000c000, 0x0000ff00},
69 {0x0c00, 0x00000003, 0x000000ff},
70};
71
72static struct serdes_cfg cfg_phyb_10p3125g_16bit_lane[] = {
73 {0x0204, 0x00000080, 0x000000ff},
74 {0x0208, 0x0000920d, 0x0000ffff},
75 {0x0204, 0xfc000000, 0xff000000},
76 {0x0208, 0x00009104, 0x0000ffff},
77 {0x0210, 0x1a000000, 0xff000000},
78 {0x0214, 0x00006b58, 0x00ffffff},
79 {0x0218, 0x75800084, 0xffff00ff},
80 {0x022c, 0x00300000, 0x00ff0000},
81 {0x0230, 0x00003800, 0x0000ff00},
82 {0x024c, 0x008f0000, 0x00ff0000},
83 {0x0250, 0x30000000, 0xff000000},
84 {0x0260, 0x00000002, 0x000000ff},
85 {0x0264, 0x00000057, 0x000000ff},
86 {0x0268, 0x00575700, 0x00ffff00},
87 {0x0278, 0xff000000, 0xff000000},
88 {0x0280, 0x00500050, 0x00ff00ff},
89 {0x0284, 0x00001f15, 0x0000ffff},
90 {0x028c, 0x00006f00, 0x0000ff00},
91 {0x0294, 0x00000000, 0xffffff00},
92 {0x0298, 0x00002640, 0xff00ffff},
93 {0x029c, 0x00000003, 0x000000ff},
94 {0x02a4, 0x00000f13, 0x0000ffff},
95 {0x02a8, 0x0001b600, 0x00ffff00},
96 {0x0380, 0x00000030, 0x000000ff},
97 {0x03c0, 0x00000200, 0x0000ff00},
98 {0x03cc, 0x00000018, 0x000000ff},
99 {0x03cc, 0x00000000, 0x000000ff},
100};
101
102static struct serdes_cfg cfg_phyb_10p3125g_comlane[] = {
103 {0x0a00, 0x00000800, 0x0000ff00},
104 {0x0a84, 0x00000000, 0x000000ff},
105 {0x0a8c, 0x00130000, 0x00ff0000},
106 {0x0a90, 0x77a00000, 0xffff0000},
107 {0x0a94, 0x00007777, 0x0000ffff},
108 {0x0b08, 0x000f0000, 0xffff0000},
109 {0x0b0c, 0x000f0000, 0x00ffffff},
110 {0x0b10, 0xbe000000, 0xff000000},
111 {0x0b14, 0x000000ff, 0x000000ff},
112 {0x0b18, 0x00000014, 0x000000ff},
113 {0x0b5c, 0x981b0000, 0xffff0000},
114 {0x0b64, 0x00001100, 0x0000ff00},
115 {0x0b78, 0x00000c00, 0x0000ff00},
116 {0x0abc, 0xff000000, 0xff000000},
117 {0x0ac0, 0x0000008b, 0x000000ff},
118};
119
120static struct serdes_cfg cfg_cm_c1_c2[] = {
121 {0x0208, 0x00000000, 0x00000f00},
122 {0x0208, 0x00000000, 0x0000001f},
123 {0x0204, 0x00000000, 0x00040000},
124 {0x0208, 0x000000a0, 0x000000e0},
125};
126
127static void netcp_xgbe_serdes_cmu_init(void __iomem *serdes_regs)
128{
129 int i;
130
131 /* cmu0 setup */
132 for (i = 0; i < ARRAY_SIZE(cfg_phyb_1p25g_156p25mhz_cmu0); i++) {
133 reg_rmw(serdes_regs + cfg_phyb_1p25g_156p25mhz_cmu0[i].ofs,
134 cfg_phyb_1p25g_156p25mhz_cmu0[i].val,
135 cfg_phyb_1p25g_156p25mhz_cmu0[i].mask);
136 }
137
138 /* cmu1 setup */
139 for (i = 0; i < ARRAY_SIZE(cfg_phyb_10p3125g_156p25mhz_cmu1); i++) {
140 reg_rmw(serdes_regs + cfg_phyb_10p3125g_156p25mhz_cmu1[i].ofs,
141 cfg_phyb_10p3125g_156p25mhz_cmu1[i].val,
142 cfg_phyb_10p3125g_156p25mhz_cmu1[i].mask);
143 }
144}
145
146/* lane is 0 based */
147static void netcp_xgbe_serdes_lane_config(
148 void __iomem *serdes_regs, int lane)
149{
150 int i;
151
152 /* lane setup */
153 for (i = 0; i < ARRAY_SIZE(cfg_phyb_10p3125g_16bit_lane); i++) {
154 reg_rmw(serdes_regs +
155 cfg_phyb_10p3125g_16bit_lane[i].ofs +
156 (0x200 * lane),
157 cfg_phyb_10p3125g_16bit_lane[i].val,
158 cfg_phyb_10p3125g_16bit_lane[i].mask);
159 }
160
161 /* disable auto negotiation*/
162 reg_rmw(serdes_regs + (0x200 * lane) + 0x0380,
163 0x00000000, 0x00000010);
164
165 /* disable link training */
166 reg_rmw(serdes_regs + (0x200 * lane) + 0x03c0,
167 0x00000000, 0x00000200);
168}
169
170static void netcp_xgbe_serdes_com_enable(void __iomem *serdes_regs)
171{
172 int i;
173
174 for (i = 0; i < ARRAY_SIZE(cfg_phyb_10p3125g_comlane); i++) {
175 reg_rmw(serdes_regs + cfg_phyb_10p3125g_comlane[i].ofs,
176 cfg_phyb_10p3125g_comlane[i].val,
177 cfg_phyb_10p3125g_comlane[i].mask);
178 }
179}
180
181static void netcp_xgbe_serdes_lane_enable(
182 void __iomem *serdes_regs, int lane)
183{
184 /* Set Lane Control Rate */
185 writel(0xe0e9e038, serdes_regs + 0x1fe0 + (4 * lane));
186}
187
188static void netcp_xgbe_serdes_phyb_rst_clr(void __iomem *serdes_regs)
189{
190 reg_rmw(serdes_regs + 0x0a00, 0x0000001f, 0x000000ff);
191}
192
193static void netcp_xgbe_serdes_pll_disable(void __iomem *serdes_regs)
194{
195 writel(0x88000000, serdes_regs + 0x1ff4);
196}
197
198static void netcp_xgbe_serdes_pll_enable(void __iomem *serdes_regs)
199{
200 netcp_xgbe_serdes_phyb_rst_clr(serdes_regs);
201 writel(0xee000000, serdes_regs + 0x1ff4);
202}
203
204static int netcp_xgbe_wait_pll_locked(void __iomem *sw_regs)
205{
206 unsigned long timeout;
207 int ret = 0;
208 u32 val_1, val_0;
209
210 timeout = jiffies + msecs_to_jiffies(500);
211 do {
212 val_0 = (readl(sw_regs + XGBE_SGMII_1_OFFSET) & BIT(4));
213 val_1 = (readl(sw_regs + XGBE_SGMII_2_OFFSET) & BIT(4));
214
215 if (val_1 && val_0)
216 return 0;
217
218 if (time_after(jiffies, timeout)) {
219 ret = -ETIMEDOUT;
220 break;
221 }
222
223 cpu_relax();
224 } while (true);
225
226 pr_err("XGBE serdes not locked: time out.\n");
227 return ret;
228}
229
230static void netcp_xgbe_serdes_enable_xgmii_port(void __iomem *sw_regs)
231{
232 writel(0x03, sw_regs + XGBE_CTRL_OFFSET);
233}
234
235static u32 netcp_xgbe_serdes_read_tbus_val(void __iomem *serdes_regs)
236{
237 u32 tmp;
238
239 if (PHY_A(serdes_regs)) {
240 tmp = (readl(serdes_regs + 0x0ec) >> 24) & 0x0ff;
241 tmp |= ((readl(serdes_regs + 0x0fc) >> 16) & 0x00f00);
242 } else {
243 tmp = (readl(serdes_regs + 0x0f8) >> 16) & 0x0fff;
244 }
245
246 return tmp;
247}
248
249static void netcp_xgbe_serdes_write_tbus_addr(void __iomem *serdes_regs,
250 int select, int ofs)
251{
252 if (PHY_A(serdes_regs)) {
253 reg_rmw(serdes_regs + 0x0008, ((select << 5) + ofs) << 24,
254 ~0x00ffffff);
255 return;
256 }
257
258 /* For 2 lane Phy-B, lane0 is actually lane1 */
259 switch (select) {
260 case 1:
261 select = 2;
262 break;
263 case 2:
264 select = 3;
265 break;
266 default:
267 return;
268 }
269
270 reg_rmw(serdes_regs + 0x00fc, ((select << 8) + ofs) << 16, ~0xf800ffff);
271}
272
273static u32 netcp_xgbe_serdes_read_select_tbus(void __iomem *serdes_regs,
274 int select, int ofs)
275{
276 /* Set tbus address */
277 netcp_xgbe_serdes_write_tbus_addr(serdes_regs, select, ofs);
278 /* Get TBUS Value */
279 return netcp_xgbe_serdes_read_tbus_val(serdes_regs);
280}
281
282static void netcp_xgbe_serdes_reset_cdr(void __iomem *serdes_regs,
283 void __iomem *sig_detect_reg, int lane)
284{
285 u32 tmp, dlpf, tbus;
286
287 /*Get the DLPF values */
288 tmp = netcp_xgbe_serdes_read_select_tbus(
289 serdes_regs, lane + 1, 5);
290
291 dlpf = tmp >> 2;
292
293 if (dlpf < 400 || dlpf > 700) {
294 reg_rmw(sig_detect_reg, VAL_SH(2, 1), MASK_WID_SH(2, 1));
295 mdelay(1);
296 reg_rmw(sig_detect_reg, VAL_SH(0, 1), MASK_WID_SH(2, 1));
297 } else {
298 tbus = netcp_xgbe_serdes_read_select_tbus(serdes_regs, lane +
299 1, 0xe);
300
301 pr_debug("XGBE: CDR centered, DLPF: %4d,%d,%d.\n",
302 tmp >> 2, tmp & 3, (tbus >> 2) & 3);
303 }
304}
305
306/* Call every 100 ms */
307static int netcp_xgbe_check_link_status(void __iomem *serdes_regs,
308 void __iomem *sw_regs, u32 lanes,
309 u32 *current_state, u32 *lane_down)
310{
311 void __iomem *pcsr_base = sw_regs + 0x0600;
312 void __iomem *sig_detect_reg;
313 u32 pcsr_rx_stat, blk_lock, blk_errs;
314 int loss, i, status = 1;
315
316 for (i = 0; i < lanes; i++) {
317 /* Get the Loss bit */
318 loss = readl(serdes_regs + 0x1fc0 + 0x20 + (i * 0x04)) & 0x1;
319
320 /* Get Block Errors and Block Lock bits */
321 pcsr_rx_stat = readl(pcsr_base + 0x0c + (i * 0x80));
322 blk_lock = (pcsr_rx_stat >> 30) & 0x1;
323 blk_errs = (pcsr_rx_stat >> 16) & 0x0ff;
324
325 /* Get Signal Detect Overlay Address */
326 sig_detect_reg = serdes_regs + (i * 0x200) + 0x200 + 0x04;
327
328 /* If Block errors maxed out, attempt recovery! */
329 if (blk_errs == 0x0ff)
330 blk_lock = 0;
331
332 switch (current_state[i]) {
333 case 0:
334 /* if good link lock the signal detect ON! */
335 if (!loss && blk_lock) {
336 pr_debug("XGBE PCSR Linked Lane: %d\n", i);
337 reg_rmw(sig_detect_reg, VAL_SH(3, 1),
338 MASK_WID_SH(2, 1));
339 current_state[i] = 1;
340 } else if (!blk_lock) {
341 /* if no lock, then reset CDR */
342 pr_debug("XGBE PCSR Recover Lane: %d\n", i);
343 netcp_xgbe_serdes_reset_cdr(serdes_regs,
344 sig_detect_reg, i);
345 }
346 break;
347
348 case 1:
349 if (!blk_lock) {
350 /* Link Lost? */
351 lane_down[i] = 1;
352 current_state[i] = 2;
353 }
354 break;
355
356 case 2:
357 if (blk_lock)
358 /* Nope just noise */
359 current_state[i] = 1;
360 else {
361 /* Lost the block lock, reset CDR if it is
362 * not centered and go back to sync state
363 */
364 netcp_xgbe_serdes_reset_cdr(serdes_regs,
365 sig_detect_reg, i);
366 current_state[i] = 0;
367 }
368 break;
369
370 default:
371 pr_err("XGBE: unknown current_state[%d] %d\n",
372 i, current_state[i]);
373 break;
374 }
375
376 if (blk_errs > 0) {
377 /* Reset the Error counts! */
378 reg_rmw(pcsr_base + 0x08 + (i * 0x80), VAL_SH(0x19, 0),
379 MASK_WID_SH(8, 0));
380
381 reg_rmw(pcsr_base + 0x08 + (i * 0x80), VAL_SH(0x00, 0),
382 MASK_WID_SH(8, 0));
383 }
384
385 status &= (current_state[i] == 1);
386 }
387
388 return status;
389}
390
391static int netcp_xgbe_serdes_check_lane(void __iomem *serdes_regs,
392 void __iomem *sw_regs)
393{
394 u32 current_state[2] = {0, 0};
395 int retries = 0, link_up;
396 u32 lane_down[2];
397
398 do {
399 lane_down[0] = 0;
400 lane_down[1] = 0;
401
402 link_up = netcp_xgbe_check_link_status(serdes_regs, sw_regs, 2,
403 current_state,
404 lane_down);
405
406 /* if we did not get link up then wait 100ms before calling
407 * it again
408 */
409 if (link_up)
410 break;
411
412 if (lane_down[0])
413 pr_debug("XGBE: detected link down on lane 0\n");
414
415 if (lane_down[1])
416 pr_debug("XGBE: detected link down on lane 1\n");
417
418 if (++retries > 1) {
419 pr_debug("XGBE: timeout waiting for serdes link up\n");
420 return -ETIMEDOUT;
421 }
422 mdelay(100);
423 } while (!link_up);
424
425 pr_debug("XGBE: PCSR link is up\n");
426 return 0;
427}
428
429static void netcp_xgbe_serdes_setup_cm_c1_c2(void __iomem *serdes_regs,
430 int lane, int cm, int c1, int c2)
431{
432 int i;
433
434 for (i = 0; i < ARRAY_SIZE(cfg_cm_c1_c2); i++) {
435 reg_rmw(serdes_regs + cfg_cm_c1_c2[i].ofs + (0x200 * lane),
436 cfg_cm_c1_c2[i].val,
437 cfg_cm_c1_c2[i].mask);
438 }
439}
440
441static void netcp_xgbe_reset_serdes(void __iomem *serdes_regs)
442{
443 /* Toggle the POR_EN bit in CONFIG.CPU_CTRL */
444 /* enable POR_EN bit */
445 reg_rmw(serdes_regs + PCSR_CPU_CTRL_OFFSET, POR_EN, POR_EN);
446 usleep_range(10, 100);
447
448 /* disable POR_EN bit */
449 reg_rmw(serdes_regs + PCSR_CPU_CTRL_OFFSET, 0, POR_EN);
450 usleep_range(10, 100);
451}
452
453static int netcp_xgbe_serdes_config(void __iomem *serdes_regs,
454 void __iomem *sw_regs)
455{
456 u32 ret, i;
457
458 netcp_xgbe_serdes_pll_disable(serdes_regs);
459 netcp_xgbe_serdes_cmu_init(serdes_regs);
460
461 for (i = 0; i < 2; i++)
462 netcp_xgbe_serdes_lane_config(serdes_regs, i);
463
464 netcp_xgbe_serdes_com_enable(serdes_regs);
465 /* This is EVM + RTM-BOC specific */
466 for (i = 0; i < 2; i++)
467 netcp_xgbe_serdes_setup_cm_c1_c2(serdes_regs, i, 0, 0, 5);
468
469 netcp_xgbe_serdes_pll_enable(serdes_regs);
470 for (i = 0; i < 2; i++)
471 netcp_xgbe_serdes_lane_enable(serdes_regs, i);
472
473 /* SB PLL Status Poll */
474 ret = netcp_xgbe_wait_pll_locked(sw_regs);
475 if (ret)
476 return ret;
477
478 netcp_xgbe_serdes_enable_xgmii_port(sw_regs);
479 netcp_xgbe_serdes_check_lane(serdes_regs, sw_regs);
480 return ret;
481}
482
483int netcp_xgbe_serdes_init(void __iomem *serdes_regs, void __iomem *xgbe_regs)
484{
485 u32 val;
486
487 /* read COMLANE bits 4:0 */
488 val = readl(serdes_regs + 0xa00);
489 if (val & 0x1f) {
490 pr_debug("XGBE: serdes already in operation - reset\n");
491 netcp_xgbe_reset_serdes(serdes_regs);
492 }
493 return netcp_xgbe_serdes_config(serdes_regs, xgbe_regs);
494}
495

source code of linux/drivers/net/ethernet/ti/netcp_xgbepcsr.c