root/drivers/net/ethernet/ti/netcp_xgbepcsr.c

DEFINITIONS

1. netcp_xgbe_serdes_cmu_init
2. netcp_xgbe_serdes_lane_config
3. netcp_xgbe_serdes_com_enable
4. netcp_xgbe_serdes_lane_enable
5. netcp_xgbe_serdes_phyb_rst_clr
6. netcp_xgbe_serdes_pll_disable
7. netcp_xgbe_serdes_pll_enable
8. netcp_xgbe_wait_pll_locked
9. netcp_xgbe_serdes_enable_xgmii_port
10. netcp_xgbe_serdes_read_tbus_val
11. netcp_xgbe_serdes_write_tbus_addr
12. netcp_xgbe_serdes_read_select_tbus
13. netcp_xgbe_serdes_reset_cdr
14. netcp_xgbe_check_link_status
15. netcp_xgbe_serdes_check_lane
16. netcp_xgbe_serdes_setup_cm_c1_c2
17. netcp_xgbe_reset_serdes
18. netcp_xgbe_serdes_config
19. netcp_xgbe_serdes_init

   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 }