drivers/net/dsa/sja1105/sja1105_clocking.c

   1 // SPDX-License-Identifier: BSD-3-Clause
   2 /* Copyright 2016-2018 NXP
   3  * Copyright (c) 2018-2019, Vladimir Oltean <olteanv@gmail.com>
   4  */
   5 #include <linux/packing.h>
   6 #include "sja1105.h"
   7
   8 #define SJA1105_SIZE_CGU_CMD    4
   9 #define SJA1110_BASE_MCSS_CLK   SJA1110_CGU_ADDR(0x70)
  10 #define SJA1110_BASE_TIMER_CLK  SJA1110_CGU_ADDR(0x74)
  11
  12 /* Common structure for CFG_PAD_MIIx_RX and CFG_PAD_MIIx_TX */
  13 struct sja1105_cfg_pad_mii {
  14         u64 d32_os;
  15         u64 d32_ih;
  16         u64 d32_ipud;
  17         u64 d10_ih;
  18         u64 d10_os;
  19         u64 d10_ipud;
  20         u64 ctrl_os;
  21         u64 ctrl_ih;
  22         u64 ctrl_ipud;
  23         u64 clk_os;
  24         u64 clk_ih;
  25         u64 clk_ipud;
  26 };
  27
  28 struct sja1105_cfg_pad_mii_id {
  29         u64 rxc_stable_ovr;
  30         u64 rxc_delay;
  31         u64 rxc_bypass;
  32         u64 rxc_pd;
  33         u64 txc_stable_ovr;
  34         u64 txc_delay;
  35         u64 txc_bypass;
  36         u64 txc_pd;
  37 };
  38
  39 /* UM10944 Table 82.
  40  * IDIV_0_C to IDIV_4_C control registers
  41  * (addr. 10000Bh to 10000Fh)
  42  */
  43 struct sja1105_cgu_idiv {
  44         u64 clksrc;
  45         u64 autoblock;
  46         u64 idiv;
  47         u64 pd;
  48 };
  49
  50 /* PLL_1_C control register
  51  *
  52  * SJA1105 E/T: UM10944 Table 81 (address 10000Ah)
  53  * SJA1105 P/Q/R/S: UM11040 Table 116 (address 10000Ah)
  54  */
  55 struct sja1105_cgu_pll_ctrl {
  56         u64 pllclksrc;
  57         u64 msel;
  58         u64 autoblock;
  59         u64 psel;
  60         u64 direct;
  61         u64 fbsel;
  62         u64 bypass;
  63         u64 pd;
  64 };
  65
  66 struct sja1110_cgu_outclk {
  67         u64 clksrc;
  68         u64 autoblock;
  69         u64 pd;
  70 };
  71
  72 enum {
  73         CLKSRC_MII0_TX_CLK      = 0x00,
  74         CLKSRC_MII0_RX_CLK      = 0x01,
  75         CLKSRC_MII1_TX_CLK      = 0x02,
  76         CLKSRC_MII1_RX_CLK      = 0x03,
  77         CLKSRC_MII2_TX_CLK      = 0x04,
  78         CLKSRC_MII2_RX_CLK      = 0x05,
  79         CLKSRC_MII3_TX_CLK      = 0x06,
  80         CLKSRC_MII3_RX_CLK      = 0x07,
  81         CLKSRC_MII4_TX_CLK      = 0x08,
  82         CLKSRC_MII4_RX_CLK      = 0x09,
  83         CLKSRC_PLL0             = 0x0B,
  84         CLKSRC_PLL1             = 0x0E,
  85         CLKSRC_IDIV0            = 0x11,
  86         CLKSRC_IDIV1            = 0x12,
  87         CLKSRC_IDIV2            = 0x13,
  88         CLKSRC_IDIV3            = 0x14,
  89         CLKSRC_IDIV4            = 0x15,
  90 };
  91
  92 /* UM10944 Table 83.
  93  * MIIx clock control registers 1 to 30
  94  * (addresses 100013h to 100035h)
  95  */
  96 struct sja1105_cgu_mii_ctrl {
  97         u64 clksrc;
  98         u64 autoblock;
  99         u64 pd;
 100 };
 101
 102 static void sja1105_cgu_idiv_packing(void *buf, struct sja1105_cgu_idiv *idiv,
 103                                      enum packing_op op)
 104 {
 105         const int size = 4;
 106
 107         sja1105_packing(buf, &idiv->clksrc,    28, 24, size, op);
 108         sja1105_packing(buf, &idiv->autoblock, 11, 11, size, op);
 109         sja1105_packing(buf, &idiv->idiv,       5,  2, size, op);
 110         sja1105_packing(buf, &idiv->pd,         0,  0, size, op);
 111 }
 112
 113 static int sja1105_cgu_idiv_config(struct sja1105_private *priv, int port,
 114                                    bool enabled, int factor)
 115 {
 116         const struct sja1105_regs *regs = priv->info->regs;
 117         struct device *dev = priv->ds->dev;
 118         struct sja1105_cgu_idiv idiv;
 119         u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
 120
 121         if (regs->cgu_idiv[port] == SJA1105_RSV_ADDR)
 122                 return 0;
 123
 124         if (enabled && factor != 1 && factor != 10) {
 125                 dev_err(dev, "idiv factor must be 1 or 10\n");
 126                 return -ERANGE;
 127         }
 128
 129         /* Payload for packed_buf */
 130         idiv.clksrc    = 0x0A;            /* 25MHz */
 131         idiv.autoblock = 1;               /* Block clk automatically */
 132         idiv.idiv      = factor - 1;      /* Divide by 1 or 10 */
 133         idiv.pd        = enabled ? 0 : 1; /* Power down? */
 134         sja1105_cgu_idiv_packing(packed_buf, &idiv, PACK);
 135
 136         return sja1105_xfer_buf(priv, SPI_WRITE, regs->cgu_idiv[port],
 137                                 packed_buf, SJA1105_SIZE_CGU_CMD);
 138 }
 139
 140 static void
 141 sja1105_cgu_mii_control_packing(void *buf, struct sja1105_cgu_mii_ctrl *cmd,
 142                                 enum packing_op op)
 143 {
 144         const int size = 4;
 145
 146         sja1105_packing(buf, &cmd->clksrc,    28, 24, size, op);
 147         sja1105_packing(buf, &cmd->autoblock, 11, 11, size, op);
 148         sja1105_packing(buf, &cmd->pd,         0,  0, size, op);
 149 }
 150
 151 static int sja1105_cgu_mii_tx_clk_config(struct sja1105_private *priv,
 152                                          int port, sja1105_mii_role_t role)
 153 {
 154         const struct sja1105_regs *regs = priv->info->regs;
 155         struct sja1105_cgu_mii_ctrl mii_tx_clk;
 156         const int mac_clk_sources[] = {
 157                 CLKSRC_MII0_TX_CLK,
 158                 CLKSRC_MII1_TX_CLK,
 159                 CLKSRC_MII2_TX_CLK,
 160                 CLKSRC_MII3_TX_CLK,
 161                 CLKSRC_MII4_TX_CLK,
 162         };
 163         const int phy_clk_sources[] = {
 164                 CLKSRC_IDIV0,
 165                 CLKSRC_IDIV1,
 166                 CLKSRC_IDIV2,
 167                 CLKSRC_IDIV3,
 168                 CLKSRC_IDIV4,
 169         };
 170         u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
 171         int clksrc;
 172
 173         if (regs->mii_tx_clk[port] == SJA1105_RSV_ADDR)
 174                 return 0;
 175
 176         if (role == XMII_MAC)
 177                 clksrc = mac_clk_sources[port];
 178         else
 179                 clksrc = phy_clk_sources[port];
 180
 181         /* Payload for packed_buf */
 182         mii_tx_clk.clksrc    = clksrc;
 183         mii_tx_clk.autoblock = 1;  /* Autoblock clk while changing clksrc */
 184         mii_tx_clk.pd        = 0;  /* Power Down off => enabled */
 185         sja1105_cgu_mii_control_packing(packed_buf, &mii_tx_clk, PACK);
 186
 187         return sja1105_xfer_buf(priv, SPI_WRITE, regs->mii_tx_clk[port],
 188                                 packed_buf, SJA1105_SIZE_CGU_CMD);
 189 }
 190
 191 static int
 192 sja1105_cgu_mii_rx_clk_config(struct sja1105_private *priv, int port)
 193 {
 194         const struct sja1105_regs *regs = priv->info->regs;
 195         struct sja1105_cgu_mii_ctrl mii_rx_clk;
 196         u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
 197         const int clk_sources[] = {
 198                 CLKSRC_MII0_RX_CLK,
 199                 CLKSRC_MII1_RX_CLK,
 200                 CLKSRC_MII2_RX_CLK,
 201                 CLKSRC_MII3_RX_CLK,
 202                 CLKSRC_MII4_RX_CLK,
 203         };
 204
 205         if (regs->mii_rx_clk[port] == SJA1105_RSV_ADDR)
 206                 return 0;
 207
 208         /* Payload for packed_buf */
 209         mii_rx_clk.clksrc    = clk_sources[port];
 210         mii_rx_clk.autoblock = 1;  /* Autoblock clk while changing clksrc */
 211         mii_rx_clk.pd        = 0;  /* Power Down off => enabled */
 212         sja1105_cgu_mii_control_packing(packed_buf, &mii_rx_clk, PACK);
 213
 214         return sja1105_xfer_buf(priv, SPI_WRITE, regs->mii_rx_clk[port],
 215                                 packed_buf, SJA1105_SIZE_CGU_CMD);
 216 }
 217
 218 static int
 219 sja1105_cgu_mii_ext_tx_clk_config(struct sja1105_private *priv, int port)
 220 {
 221         const struct sja1105_regs *regs = priv->info->regs;
 222         struct sja1105_cgu_mii_ctrl mii_ext_tx_clk;
 223         u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
 224         const int clk_sources[] = {
 225                 CLKSRC_IDIV0,
 226                 CLKSRC_IDIV1,
 227                 CLKSRC_IDIV2,
 228                 CLKSRC_IDIV3,
 229                 CLKSRC_IDIV4,
 230         };
 231
 232         if (regs->mii_ext_tx_clk[port] == SJA1105_RSV_ADDR)
 233                 return 0;
 234
 235         /* Payload for packed_buf */
 236         mii_ext_tx_clk.clksrc    = clk_sources[port];
 237         mii_ext_tx_clk.autoblock = 1; /* Autoblock clk while changing clksrc */
 238         mii_ext_tx_clk.pd        = 0; /* Power Down off => enabled */
 239         sja1105_cgu_mii_control_packing(packed_buf, &mii_ext_tx_clk, PACK);
 240
 241         return sja1105_xfer_buf(priv, SPI_WRITE, regs->mii_ext_tx_clk[port],
 242                                 packed_buf, SJA1105_SIZE_CGU_CMD);
 243 }
 244
 245 static int
 246 sja1105_cgu_mii_ext_rx_clk_config(struct sja1105_private *priv, int port)
 247 {
 248         const struct sja1105_regs *regs = priv->info->regs;
 249         struct sja1105_cgu_mii_ctrl mii_ext_rx_clk;
 250         u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
 251         const int clk_sources[] = {
 252                 CLKSRC_IDIV0,
 253                 CLKSRC_IDIV1,
 254                 CLKSRC_IDIV2,
 255                 CLKSRC_IDIV3,
 256                 CLKSRC_IDIV4,
 257         };
 258
 259         if (regs->mii_ext_rx_clk[port] == SJA1105_RSV_ADDR)
 260                 return 0;
 261
 262         /* Payload for packed_buf */
 263         mii_ext_rx_clk.clksrc    = clk_sources[port];
 264         mii_ext_rx_clk.autoblock = 1; /* Autoblock clk while changing clksrc */
 265         mii_ext_rx_clk.pd        = 0; /* Power Down off => enabled */
 266         sja1105_cgu_mii_control_packing(packed_buf, &mii_ext_rx_clk, PACK);
 267
 268         return sja1105_xfer_buf(priv, SPI_WRITE, regs->mii_ext_rx_clk[port],
 269                                 packed_buf, SJA1105_SIZE_CGU_CMD);
 270 }
 271
 272 static int sja1105_mii_clocking_setup(struct sja1105_private *priv, int port,
 273                                       sja1105_mii_role_t role)
 274 {
 275         struct device *dev = priv->ds->dev;
 276         int rc;
 277
 278         dev_dbg(dev, "Configuring MII-%s clocking\n",
 279                 (role == XMII_MAC) ? "MAC" : "PHY");
 280         /* If role is MAC, disable IDIV
 281          * If role is PHY, enable IDIV and configure for 1/1 divider
 282          */
 283         rc = sja1105_cgu_idiv_config(priv, port, (role == XMII_PHY), 1);
 284         if (rc < 0)
 285                 return rc;
 286
 287         /* Configure CLKSRC of MII_TX_CLK_n
 288          *   * If role is MAC, select TX_CLK_n
 289          *   * If role is PHY, select IDIV_n
 290          */
 291         rc = sja1105_cgu_mii_tx_clk_config(priv, port, role);
 292         if (rc < 0)
 293                 return rc;
 294
 295         /* Configure CLKSRC of MII_RX_CLK_n
 296          * Select RX_CLK_n
 297          */
 298         rc = sja1105_cgu_mii_rx_clk_config(priv, port);
 299         if (rc < 0)
 300                 return rc;
 301
 302         if (role == XMII_PHY) {
 303                 /* Per MII spec, the PHY (which is us) drives the TX_CLK pin */
 304
 305                 /* Configure CLKSRC of EXT_TX_CLK_n
 306                  * Select IDIV_n
 307                  */
 308                 rc = sja1105_cgu_mii_ext_tx_clk_config(priv, port);
 309                 if (rc < 0)
 310                         return rc;
 311
 312                 /* Configure CLKSRC of EXT_RX_CLK_n
 313                  * Select IDIV_n
 314                  */
 315                 rc = sja1105_cgu_mii_ext_rx_clk_config(priv, port);
 316                 if (rc < 0)
 317                         return rc;
 318         }
 319         return 0;
 320 }
 321
 322 static void
 323 sja1105_cgu_pll_control_packing(void *buf, struct sja1105_cgu_pll_ctrl *cmd,
 324                                 enum packing_op op)
 325 {
 326         const int size = 4;
 327
 328         sja1105_packing(buf, &cmd->pllclksrc, 28, 24, size, op);
 329         sja1105_packing(buf, &cmd->msel,      23, 16, size, op);
 330         sja1105_packing(buf, &cmd->autoblock, 11, 11, size, op);
 331         sja1105_packing(buf, &cmd->psel,       9,  8, size, op);
 332         sja1105_packing(buf, &cmd->direct,     7,  7, size, op);
 333         sja1105_packing(buf, &cmd->fbsel,      6,  6, size, op);
 334         sja1105_packing(buf, &cmd->bypass,     1,  1, size, op);
 335         sja1105_packing(buf, &cmd->pd,         0,  0, size, op);
 336 }
 337
 338 static int sja1105_cgu_rgmii_tx_clk_config(struct sja1105_private *priv,
 339                                            int port, u64 speed)
 340 {
 341         const struct sja1105_regs *regs = priv->info->regs;
 342         struct sja1105_cgu_mii_ctrl txc;
 343         u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
 344         int clksrc;
 345
 346         if (regs->rgmii_tx_clk[port] == SJA1105_RSV_ADDR)
 347                 return 0;
 348
 349         if (speed == priv->info->port_speed[SJA1105_SPEED_1000MBPS]) {
 350                 clksrc = CLKSRC_PLL0;
 351         } else {
 352                 int clk_sources[] = {CLKSRC_IDIV0, CLKSRC_IDIV1, CLKSRC_IDIV2,
 353                                      CLKSRC_IDIV3, CLKSRC_IDIV4};
 354                 clksrc = clk_sources[port];
 355         }
 356
 357         /* RGMII: 125MHz for 1000, 25MHz for 100, 2.5MHz for 10 */
 358         txc.clksrc = clksrc;
 359         /* Autoblock clk while changing clksrc */
 360         txc.autoblock = 1;
 361         /* Power Down off => enabled */
 362         txc.pd = 0;
 363         sja1105_cgu_mii_control_packing(packed_buf, &txc, PACK);
 364
 365         return sja1105_xfer_buf(priv, SPI_WRITE, regs->rgmii_tx_clk[port],
 366                                 packed_buf, SJA1105_SIZE_CGU_CMD);
 367 }
 368
 369 /* AGU */
 370 static void
 371 sja1105_cfg_pad_mii_packing(void *buf, struct sja1105_cfg_pad_mii *cmd,
 372                             enum packing_op op)
 373 {
 374         const int size = 4;
 375
 376         sja1105_packing(buf, &cmd->d32_os,   28, 27, size, op);
 377         sja1105_packing(buf, &cmd->d32_ih,   26, 26, size, op);
 378         sja1105_packing(buf, &cmd->d32_ipud, 25, 24, size, op);
 379         sja1105_packing(buf, &cmd->d10_os,   20, 19, size, op);
 380         sja1105_packing(buf, &cmd->d10_ih,   18, 18, size, op);
 381         sja1105_packing(buf, &cmd->d10_ipud, 17, 16, size, op);
 382         sja1105_packing(buf, &cmd->ctrl_os,  12, 11, size, op);
 383         sja1105_packing(buf, &cmd->ctrl_ih,  10, 10, size, op);
 384         sja1105_packing(buf, &cmd->ctrl_ipud, 9,  8, size, op);
 385         sja1105_packing(buf, &cmd->clk_os,    4,  3, size, op);
 386         sja1105_packing(buf, &cmd->clk_ih,    2,  2, size, op);
 387         sja1105_packing(buf, &cmd->clk_ipud,  1,  0, size, op);
 388 }
 389
 390 static int sja1105_rgmii_cfg_pad_tx_config(struct sja1105_private *priv,
 391                                            int port)
 392 {
 393         const struct sja1105_regs *regs = priv->info->regs;
 394         struct sja1105_cfg_pad_mii pad_mii_tx = {0};
 395         u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
 396
 397         if (regs->pad_mii_tx[port] == SJA1105_RSV_ADDR)
 398                 return 0;
 399
 400         /* Payload */
 401         pad_mii_tx.d32_os    = 3; /* TXD[3:2] output stage: */
 402                                   /*          high noise/high speed */
 403         pad_mii_tx.d10_os    = 3; /* TXD[1:0] output stage: */
 404                                   /*          high noise/high speed */
 405         pad_mii_tx.d32_ipud  = 2; /* TXD[3:2] input stage: */
 406                                   /*          plain input (default) */
 407         pad_mii_tx.d10_ipud  = 2; /* TXD[1:0] input stage: */
 408                                   /*          plain input (default) */
 409         pad_mii_tx.ctrl_os   = 3; /* TX_CTL / TX_ER output stage */
 410         pad_mii_tx.ctrl_ipud = 2; /* TX_CTL / TX_ER input stage (default) */
 411         pad_mii_tx.clk_os    = 3; /* TX_CLK output stage */
 412         pad_mii_tx.clk_ih    = 0; /* TX_CLK input hysteresis (default) */
 413         pad_mii_tx.clk_ipud  = 2; /* TX_CLK input stage (default) */
 414         sja1105_cfg_pad_mii_packing(packed_buf, &pad_mii_tx, PACK);
 415
 416         return sja1105_xfer_buf(priv, SPI_WRITE, regs->pad_mii_tx[port],
 417                                 packed_buf, SJA1105_SIZE_CGU_CMD);
 418 }
 419
 420 static int sja1105_cfg_pad_rx_config(struct sja1105_private *priv, int port)
 421 {
 422         const struct sja1105_regs *regs = priv->info->regs;
 423         struct sja1105_cfg_pad_mii pad_mii_rx = {0};
 424         u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
 425
 426         if (regs->pad_mii_rx[port] == SJA1105_RSV_ADDR)
 427                 return 0;
 428
 429         /* Payload */
 430         pad_mii_rx.d32_ih    = 0; /* RXD[3:2] input stage hysteresis: */
 431                                   /*          non-Schmitt (default) */
 432         pad_mii_rx.d32_ipud  = 2; /* RXD[3:2] input weak pull-up/down */
 433                                   /*          plain input (default) */
 434         pad_mii_rx.d10_ih    = 0; /* RXD[1:0] input stage hysteresis: */
 435                                   /*          non-Schmitt (default) */
 436         pad_mii_rx.d10_ipud  = 2; /* RXD[1:0] input weak pull-up/down */
 437                                   /*          plain input (default) */
 438         pad_mii_rx.ctrl_ih   = 0; /* RX_DV/CRS_DV/RX_CTL and RX_ER */
 439                                   /* input stage hysteresis: */
 440                                   /* non-Schmitt (default) */
 441         pad_mii_rx.ctrl_ipud = 3; /* RX_DV/CRS_DV/RX_CTL and RX_ER */
 442                                   /* input stage weak pull-up/down: */
 443                                   /* pull-down */
 444         pad_mii_rx.clk_os    = 2; /* RX_CLK/RXC output stage: */
 445                                   /* medium noise/fast speed (default) */
 446         pad_mii_rx.clk_ih    = 0; /* RX_CLK/RXC input hysteresis: */
 447                                   /* non-Schmitt (default) */
 448         pad_mii_rx.clk_ipud  = 2; /* RX_CLK/RXC input pull-up/down: */
 449                                   /* plain input (default) */
 450         sja1105_cfg_pad_mii_packing(packed_buf, &pad_mii_rx, PACK);
 451
 452         return sja1105_xfer_buf(priv, SPI_WRITE, regs->pad_mii_rx[port],
 453                                 packed_buf, SJA1105_SIZE_CGU_CMD);
 454 }
 455
 456 static void
 457 sja1105_cfg_pad_mii_id_packing(void *buf, struct sja1105_cfg_pad_mii_id *cmd,
 458                                enum packing_op op)
 459 {
 460         const int size = SJA1105_SIZE_CGU_CMD;
 461
 462         sja1105_packing(buf, &cmd->rxc_stable_ovr, 15, 15, size, op);
 463         sja1105_packing(buf, &cmd->rxc_delay,      14, 10, size, op);
 464         sja1105_packing(buf, &cmd->rxc_bypass,      9,  9, size, op);
 465         sja1105_packing(buf, &cmd->rxc_pd,          8,  8, size, op);
 466         sja1105_packing(buf, &cmd->txc_stable_ovr,  7,  7, size, op);
 467         sja1105_packing(buf, &cmd->txc_delay,       6,  2, size, op);
 468         sja1105_packing(buf, &cmd->txc_bypass,      1,  1, size, op);
 469         sja1105_packing(buf, &cmd->txc_pd,          0,  0, size, op);
 470 }
 471
 472 static void
 473 sja1110_cfg_pad_mii_id_packing(void *buf, struct sja1105_cfg_pad_mii_id *cmd,
 474                                enum packing_op op)
 475 {
 476         const int size = SJA1105_SIZE_CGU_CMD;
 477         u64 range = 4;
 478
 479         /* Fields RXC_RANGE and TXC_RANGE select the input frequency range:
 480          * 0 = 2.5MHz
 481          * 1 = 25MHz
 482          * 2 = 50MHz
 483          * 3 = 125MHz
 484          * 4 = Automatically determined by port speed.
 485          * There's no point in defining a structure different than the one for
 486          * SJA1105, so just hardcode the frequency range to automatic, just as
 487          * before.
 488          */
 489         sja1105_packing(buf, &cmd->rxc_stable_ovr, 26, 26, size, op);
 490         sja1105_packing(buf, &cmd->rxc_delay,      25, 21, size, op);
 491         sja1105_packing(buf, &range,               20, 18, size, op);
 492         sja1105_packing(buf, &cmd->rxc_bypass,     17, 17, size, op);
 493         sja1105_packing(buf, &cmd->rxc_pd,         16, 16, size, op);
 494         sja1105_packing(buf, &cmd->txc_stable_ovr, 10, 10, size, op);
 495         sja1105_packing(buf, &cmd->txc_delay,       9,  5, size, op);
 496         sja1105_packing(buf, &range,                4,  2, size, op);
 497         sja1105_packing(buf, &cmd->txc_bypass,      1,  1, size, op);
 498         sja1105_packing(buf, &cmd->txc_pd,          0,  0, size, op);
 499 }
 500
 501 /* Valid range in degrees is an integer between 73.8 and 101.7 */
 502 static u64 sja1105_rgmii_delay(u64 phase)
 503 {
 504         /* UM11040.pdf: The delay in degree phase is 73.8 + delay_tune * 0.9.
 505          * To avoid floating point operations we'll multiply by 10
 506          * and get 1 decimal point precision.
 507          */
 508         phase *= 10;
 509         return (phase - 738) / 9;
 510 }
 511
 512 /* The RGMII delay setup procedure is 2-step and gets called upon each
 513  * .phylink_mac_config. Both are strategic.
 514  * The reason is that the RX Tunable Delay Line of the SJA1105 MAC has issues
 515  * with recovering from a frequency change of the link partner's RGMII clock.
 516  * The easiest way to recover from this is to temporarily power down the TDL,
 517  * as it will re-lock at the new frequency afterwards.
 518  */
 519 int sja1105pqrs_setup_rgmii_delay(const void *ctx, int port)
 520 {
 521         const struct sja1105_private *priv = ctx;
 522         const struct sja1105_regs *regs = priv->info->regs;
 523         struct sja1105_cfg_pad_mii_id pad_mii_id = {0};
 524         u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
 525         int rc;
 526
 527         if (priv->rgmii_rx_delay[port])
 528                 pad_mii_id.rxc_delay = sja1105_rgmii_delay(90);
 529         if (priv->rgmii_tx_delay[port])
 530                 pad_mii_id.txc_delay = sja1105_rgmii_delay(90);
 531
 532         /* Stage 1: Turn the RGMII delay lines off. */
 533         pad_mii_id.rxc_bypass = 1;
 534         pad_mii_id.rxc_pd = 1;
 535         pad_mii_id.txc_bypass = 1;
 536         pad_mii_id.txc_pd = 1;
 537         sja1105_cfg_pad_mii_id_packing(packed_buf, &pad_mii_id, PACK);
 538
 539         rc = sja1105_xfer_buf(priv, SPI_WRITE, regs->pad_mii_id[port],
 540                               packed_buf, SJA1105_SIZE_CGU_CMD);
 541         if (rc < 0)
 542                 return rc;
 543
 544         /* Stage 2: Turn the RGMII delay lines on. */
 545         if (priv->rgmii_rx_delay[port]) {
 546                 pad_mii_id.rxc_bypass = 0;
 547                 pad_mii_id.rxc_pd = 0;
 548         }
 549         if (priv->rgmii_tx_delay[port]) {
 550                 pad_mii_id.txc_bypass = 0;
 551                 pad_mii_id.txc_pd = 0;
 552         }
 553         sja1105_cfg_pad_mii_id_packing(packed_buf, &pad_mii_id, PACK);
 554
 555         return sja1105_xfer_buf(priv, SPI_WRITE, regs->pad_mii_id[port],
 556                                 packed_buf, SJA1105_SIZE_CGU_CMD);
 557 }
 558
 559 int sja1110_setup_rgmii_delay(const void *ctx, int port)
 560 {
 561         const struct sja1105_private *priv = ctx;
 562         const struct sja1105_regs *regs = priv->info->regs;
 563         struct sja1105_cfg_pad_mii_id pad_mii_id = {0};
 564         u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
 565
 566         pad_mii_id.rxc_pd = 1;
 567         pad_mii_id.txc_pd = 1;
 568
 569         if (priv->rgmii_rx_delay[port]) {
 570                 pad_mii_id.rxc_delay = sja1105_rgmii_delay(90);
 571                 /* The "BYPASS" bit in SJA1110 is actually a "don't bypass" */
 572                 pad_mii_id.rxc_bypass = 1;
 573                 pad_mii_id.rxc_pd = 0;
 574         }
 575
 576         if (priv->rgmii_tx_delay[port]) {
 577                 pad_mii_id.txc_delay = sja1105_rgmii_delay(90);
 578                 pad_mii_id.txc_bypass = 1;
 579                 pad_mii_id.txc_pd = 0;
 580         }
 581
 582         sja1110_cfg_pad_mii_id_packing(packed_buf, &pad_mii_id, PACK);
 583
 584         return sja1105_xfer_buf(priv, SPI_WRITE, regs->pad_mii_id[port],
 585                                 packed_buf, SJA1105_SIZE_CGU_CMD);
 586 }
 587
 588 static int sja1105_rgmii_clocking_setup(struct sja1105_private *priv, int port,
 589                                         sja1105_mii_role_t role)
 590 {
 591         struct device *dev = priv->ds->dev;
 592         struct sja1105_mac_config_entry *mac;
 593         u64 speed;
 594         int rc;
 595
 596         mac = priv->static_config.tables[BLK_IDX_MAC_CONFIG].entries;
 597         speed = mac[port].speed;
 598
 599         dev_dbg(dev, "Configuring port %d RGMII at speed %lldMbps\n",
 600                 port, speed);
 601
 602         if (speed == priv->info->port_speed[SJA1105_SPEED_1000MBPS]) {
 603                 /* 1000Mbps, IDIV disabled (125 MHz) */
 604                 rc = sja1105_cgu_idiv_config(priv, port, false, 1);
 605         } else if (speed == priv->info->port_speed[SJA1105_SPEED_100MBPS]) {
 606                 /* 100Mbps, IDIV enabled, divide by 1 (25 MHz) */
 607                 rc = sja1105_cgu_idiv_config(priv, port, true, 1);
 608         } else if (speed == priv->info->port_speed[SJA1105_SPEED_10MBPS]) {
 609                 /* 10Mbps, IDIV enabled, divide by 10 (2.5 MHz) */
 610                 rc = sja1105_cgu_idiv_config(priv, port, true, 10);
 611         } else if (speed == priv->info->port_speed[SJA1105_SPEED_AUTO]) {
 612                 /* Skip CGU configuration if there is no speed available
 613                  * (e.g. link is not established yet)
 614                  */
 615                 dev_dbg(dev, "Speed not available, skipping CGU config\n");
 616                 return 0;
 617         } else {
 618                 rc = -EINVAL;
 619         }
 620
 621         if (rc < 0) {
 622                 dev_err(dev, "Failed to configure idiv\n");
 623                 return rc;
 624         }
 625         rc = sja1105_cgu_rgmii_tx_clk_config(priv, port, speed);
 626         if (rc < 0) {
 627                 dev_err(dev, "Failed to configure RGMII Tx clock\n");
 628                 return rc;
 629         }
 630         rc = sja1105_rgmii_cfg_pad_tx_config(priv, port);
 631         if (rc < 0) {
 632                 dev_err(dev, "Failed to configure Tx pad registers\n");
 633                 return rc;
 634         }
 635
 636         if (!priv->info->setup_rgmii_delay)
 637                 return 0;
 638
 639         return priv->info->setup_rgmii_delay(priv, port);
 640 }
 641
 642 static int sja1105_cgu_rmii_ref_clk_config(struct sja1105_private *priv,
 643                                            int port)
 644 {
 645         const struct sja1105_regs *regs = priv->info->regs;
 646         struct sja1105_cgu_mii_ctrl ref_clk;
 647         u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
 648         const int clk_sources[] = {
 649                 CLKSRC_MII0_TX_CLK,
 650                 CLKSRC_MII1_TX_CLK,
 651                 CLKSRC_MII2_TX_CLK,
 652                 CLKSRC_MII3_TX_CLK,
 653                 CLKSRC_MII4_TX_CLK,
 654         };
 655
 656         if (regs->rmii_ref_clk[port] == SJA1105_RSV_ADDR)
 657                 return 0;
 658
 659         /* Payload for packed_buf */
 660         ref_clk.clksrc    = clk_sources[port];
 661         ref_clk.autoblock = 1;      /* Autoblock clk while changing clksrc */
 662         ref_clk.pd        = 0;      /* Power Down off => enabled */
 663         sja1105_cgu_mii_control_packing(packed_buf, &ref_clk, PACK);
 664
 665         return sja1105_xfer_buf(priv, SPI_WRITE, regs->rmii_ref_clk[port],
 666                                 packed_buf, SJA1105_SIZE_CGU_CMD);
 667 }
 668
 669 static int
 670 sja1105_cgu_rmii_ext_tx_clk_config(struct sja1105_private *priv, int port)
 671 {
 672         const struct sja1105_regs *regs = priv->info->regs;
 673         struct sja1105_cgu_mii_ctrl ext_tx_clk;
 674         u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
 675
 676         if (regs->rmii_ext_tx_clk[port] == SJA1105_RSV_ADDR)
 677                 return 0;
 678
 679         /* Payload for packed_buf */
 680         ext_tx_clk.clksrc    = CLKSRC_PLL1;
 681         ext_tx_clk.autoblock = 1;   /* Autoblock clk while changing clksrc */
 682         ext_tx_clk.pd        = 0;   /* Power Down off => enabled */
 683         sja1105_cgu_mii_control_packing(packed_buf, &ext_tx_clk, PACK);
 684
 685         return sja1105_xfer_buf(priv, SPI_WRITE, regs->rmii_ext_tx_clk[port],
 686                                 packed_buf, SJA1105_SIZE_CGU_CMD);
 687 }
 688
 689 static int sja1105_cgu_rmii_pll_config(struct sja1105_private *priv)
 690 {
 691         const struct sja1105_regs *regs = priv->info->regs;
 692         u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
 693         struct sja1105_cgu_pll_ctrl pll = {0};
 694         struct device *dev = priv->ds->dev;
 695         int rc;
 696
 697         if (regs->rmii_pll1 == SJA1105_RSV_ADDR)
 698                 return 0;
 699
 700         /* PLL1 must be enabled and output 50 Mhz.
 701          * This is done by writing first 0x0A010941 to
 702          * the PLL_1_C register and then deasserting
 703          * power down (PD) 0x0A010940.
 704          */
 705
 706         /* Step 1: PLL1 setup for 50Mhz */
 707         pll.pllclksrc = 0xA;
 708         pll.msel      = 0x1;
 709         pll.autoblock = 0x1;
 710         pll.psel      = 0x1;
 711         pll.direct    = 0x0;
 712         pll.fbsel     = 0x1;
 713         pll.bypass    = 0x0;
 714         pll.pd        = 0x1;
 715
 716         sja1105_cgu_pll_control_packing(packed_buf, &pll, PACK);
 717         rc = sja1105_xfer_buf(priv, SPI_WRITE, regs->rmii_pll1, packed_buf,
 718                               SJA1105_SIZE_CGU_CMD);
 719         if (rc < 0) {
 720                 dev_err(dev, "failed to configure PLL1 for 50MHz\n");
 721                 return rc;
 722         }
 723
 724         /* Step 2: Enable PLL1 */
 725         pll.pd = 0x0;
 726
 727         sja1105_cgu_pll_control_packing(packed_buf, &pll, PACK);
 728         rc = sja1105_xfer_buf(priv, SPI_WRITE, regs->rmii_pll1, packed_buf,
 729                               SJA1105_SIZE_CGU_CMD);
 730         if (rc < 0) {
 731                 dev_err(dev, "failed to enable PLL1\n");
 732                 return rc;
 733         }
 734         return rc;
 735 }
 736
 737 static int sja1105_rmii_clocking_setup(struct sja1105_private *priv, int port,
 738                                        sja1105_mii_role_t role)
 739 {
 740         struct device *dev = priv->ds->dev;
 741         int rc;
 742
 743         dev_dbg(dev, "Configuring RMII-%s clocking\n",
 744                 (role == XMII_MAC) ? "MAC" : "PHY");
 745         /* AH1601.pdf chapter 2.5.1. Sources */
 746         if (role == XMII_MAC) {
 747                 /* Configure and enable PLL1 for 50Mhz output */
 748                 rc = sja1105_cgu_rmii_pll_config(priv);
 749                 if (rc < 0)
 750                         return rc;
 751         }
 752         /* Disable IDIV for this port */
 753         rc = sja1105_cgu_idiv_config(priv, port, false, 1);
 754         if (rc < 0)
 755                 return rc;
 756         /* Source to sink mappings */
 757         rc = sja1105_cgu_rmii_ref_clk_config(priv, port);
 758         if (rc < 0)
 759                 return rc;
 760         if (role == XMII_MAC) {
 761                 rc = sja1105_cgu_rmii_ext_tx_clk_config(priv, port);
 762                 if (rc < 0)
 763                         return rc;
 764         }
 765         return 0;
 766 }
 767
 768 int sja1105_clocking_setup_port(struct sja1105_private *priv, int port)
 769 {
 770         struct sja1105_xmii_params_entry *mii;
 771         struct device *dev = priv->ds->dev;
 772         sja1105_phy_interface_t phy_mode;
 773         sja1105_mii_role_t role;
 774         int rc;
 775
 776         mii = priv->static_config.tables[BLK_IDX_XMII_PARAMS].entries;
 777
 778         /* RGMII etc */
 779         phy_mode = mii->xmii_mode[port];
 780         /* MAC or PHY, for applicable types (not RGMII) */
 781         role = mii->phy_mac[port];
 782
 783         switch (phy_mode) {
 784         case XMII_MODE_MII:
 785                 rc = sja1105_mii_clocking_setup(priv, port, role);
 786                 break;
 787         case XMII_MODE_RMII:
 788                 rc = sja1105_rmii_clocking_setup(priv, port, role);
 789                 break;
 790         case XMII_MODE_RGMII:
 791                 rc = sja1105_rgmii_clocking_setup(priv, port, role);
 792                 break;
 793         case XMII_MODE_SGMII:
 794                 /* Nothing to do in the CGU for SGMII */
 795                 rc = 0;
 796                 break;
 797         default:
 798                 dev_err(dev, "Invalid interface mode specified: %d\n",
 799                         phy_mode);
 800                 return -EINVAL;
 801         }
 802         if (rc) {
 803                 dev_err(dev, "Clocking setup for port %d failed: %d\n",
 804                         port, rc);
 805                 return rc;
 806         }
 807
 808         /* Internally pull down the RX_DV/CRS_DV/RX_CTL and RX_ER inputs */
 809         return sja1105_cfg_pad_rx_config(priv, port);
 810 }
 811
 812 int sja1105_clocking_setup(struct sja1105_private *priv)
 813 {
 814         struct dsa_switch *ds = priv->ds;
 815         int port, rc;
 816
 817         for (port = 0; port < ds->num_ports; port++) {
 818                 rc = sja1105_clocking_setup_port(priv, port);
 819                 if (rc < 0)
 820                         return rc;
 821         }
 822         return 0;
 823 }
 824
 825 static void
 826 sja1110_cgu_outclk_packing(void *buf, struct sja1110_cgu_outclk *outclk,
 827                            enum packing_op op)
 828 {
 829         const int size = 4;
 830
 831         sja1105_packing(buf, &outclk->clksrc,    27, 24, size, op);
 832         sja1105_packing(buf, &outclk->autoblock, 11, 11, size, op);
 833         sja1105_packing(buf, &outclk->pd,         0,  0, size, op);
 834 }
 835
 836 int sja1110_disable_microcontroller(struct sja1105_private *priv)
 837 {
 838         u8 packed_buf[SJA1105_SIZE_CGU_CMD] = {0};
 839         struct sja1110_cgu_outclk outclk_6_c = {
 840                 .clksrc = 0x3,
 841                 .pd = true,
 842         };
 843         struct sja1110_cgu_outclk outclk_7_c = {
 844                 .clksrc = 0x5,
 845                 .pd = true,
 846         };
 847         int rc;
 848
 849         /* Power down the BASE_TIMER_CLK to disable the watchdog timer */
 850         sja1110_cgu_outclk_packing(packed_buf, &outclk_7_c, PACK);
 851
 852         rc = sja1105_xfer_buf(priv, SPI_WRITE, SJA1110_BASE_TIMER_CLK,
 853                               packed_buf, SJA1105_SIZE_CGU_CMD);
 854         if (rc)
 855                 return rc;
 856
 857         /* Power down the BASE_MCSS_CLOCK to gate the microcontroller off */
 858         sja1110_cgu_outclk_packing(packed_buf, &outclk_6_c, PACK);
 859
 860         return sja1105_xfer_buf(priv, SPI_WRITE, SJA1110_BASE_MCSS_CLK,
 861                                 packed_buf, SJA1105_SIZE_CGU_CMD);
 862 }