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 
33 struct serdes_cfg {
34 	u32 ofs;
35 	u32 val;
36 	u32 mask;
37 };
38 
39 static 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 
50 static 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 
72 static 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 
102 static 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 
120 static 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 
127 static 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 */
147 static 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 
170 static 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 
181 static 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 
188 static void netcp_xgbe_serdes_phyb_rst_clr(void __iomem *serdes_regs)
189 {
190 	reg_rmw(serdes_regs + 0x0a00, 0x0000001f, 0x000000ff);
191 }
192 
193 static void netcp_xgbe_serdes_pll_disable(void __iomem *serdes_regs)
194 {
195 	writel(0x88000000, serdes_regs + 0x1ff4);
196 }
197 
198 static 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 
204 static 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 
230 static void netcp_xgbe_serdes_enable_xgmii_port(void __iomem *sw_regs)
231 {
232 	writel(0x03, sw_regs + XGBE_CTRL_OFFSET);
233 }
234 
235 static 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 
249 static 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 
273 static 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 
282 static 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 */
307 static 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 
391 static 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 
429 static 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 
441 static 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 
453 static 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 
483 int 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