drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Amlogic Meson8b, Meson8m2 and GXBB DWMAC glue layer
   4  *
   5  * Copyright (C) 2016 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
   6  */
   7
   8 #include <linux/clk.h>
   9 #include <linux/clk-provider.h>
  10 #include <linux/device.h>
  11 #include <linux/ethtool.h>
  12 #include <linux/io.h>
  13 #include <linux/ioport.h>
  14 #include <linux/module.h>
  15 #include <linux/of_device.h>
  16 #include <linux/of_net.h>
  17 #include <linux/mfd/syscon.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/stmmac.h>
  20
  21 #include "stmmac_platform.h"
  22
  23 #define PRG_ETH0                        0x0
  24
  25 #define PRG_ETH0_RGMII_MODE             BIT(0)
  26
  27 #define PRG_ETH0_EXT_PHY_MODE_MASK      GENMASK(2, 0)
  28 #define PRG_ETH0_EXT_RGMII_MODE         1
  29 #define PRG_ETH0_EXT_RMII_MODE          4
  30
  31 /* mux to choose between fclk_div2 (bit unset) and mpll2 (bit set) */
  32 #define PRG_ETH0_CLK_M250_SEL_SHIFT     4
  33 #define PRG_ETH0_CLK_M250_SEL_MASK      GENMASK(4, 4)
  34
  35 #define PRG_ETH0_TXDLY_SHIFT            5
  36 #define PRG_ETH0_TXDLY_MASK             GENMASK(6, 5)
  37
  38 /* divider for the result of m250_sel */
  39 #define PRG_ETH0_CLK_M250_DIV_SHIFT     7
  40 #define PRG_ETH0_CLK_M250_DIV_WIDTH     3
  41
  42 #define PRG_ETH0_RGMII_TX_CLK_EN        10
  43
  44 #define PRG_ETH0_INVERTED_RMII_CLK      BIT(11)
  45 #define PRG_ETH0_TX_AND_PHY_REF_CLK     BIT(12)
  46
  47 #define MUX_CLK_NUM_PARENTS             2
  48
  49 struct meson8b_dwmac;
  50
  51 struct meson8b_dwmac_data {
  52         int (*set_phy_mode)(struct meson8b_dwmac *dwmac);
  53 };
  54
  55 struct meson8b_dwmac {
  56         struct device                   *dev;
  57         void __iomem                    *regs;
  58
  59         const struct meson8b_dwmac_data *data;
  60         phy_interface_t                 phy_mode;
  61         struct clk                      *rgmii_tx_clk;
  62         u32                             tx_delay_ns;
  63 };
  64
  65 struct meson8b_dwmac_clk_configs {
  66         struct clk_mux          m250_mux;
  67         struct clk_divider      m250_div;
  68         struct clk_fixed_factor fixed_div2;
  69         struct clk_gate         rgmii_tx_en;
  70 };
  71
  72 static void meson8b_dwmac_mask_bits(struct meson8b_dwmac *dwmac, u32 reg,
  73                                     u32 mask, u32 value)
  74 {
  75         u32 data;
  76
  77         data = readl(dwmac->regs + reg);
  78         data &= ~mask;
  79         data |= (value & mask);
  80
  81         writel(data, dwmac->regs + reg);
  82 }
  83
  84 static struct clk *meson8b_dwmac_register_clk(struct meson8b_dwmac *dwmac,
  85                                               const char *name_suffix,
  86                                               const char **parent_names,
  87                                               int num_parents,
  88                                               const struct clk_ops *ops,
  89                                               struct clk_hw *hw)
  90 {
  91         struct clk_init_data init;
  92         char clk_name[32];
  93
  94         snprintf(clk_name, sizeof(clk_name), "%s#%s", dev_name(dwmac->dev),
  95                  name_suffix);
  96
  97         init.name = clk_name;
  98         init.ops = ops;
  99         init.flags = CLK_SET_RATE_PARENT;
 100         init.parent_names = parent_names;
 101         init.num_parents = num_parents;
 102
 103         hw->init = &init;
 104
 105         return devm_clk_register(dwmac->dev, hw);
 106 }
 107
 108 static int meson8b_init_rgmii_tx_clk(struct meson8b_dwmac *dwmac)
 109 {
 110         int i, ret;
 111         struct clk *clk;
 112         struct device *dev = dwmac->dev;
 113         const char *parent_name, *mux_parent_names[MUX_CLK_NUM_PARENTS];
 114         struct meson8b_dwmac_clk_configs *clk_configs;
 115         static const struct clk_div_table div_table[] = {
 116                 { .div = 2, .val = 2, },
 117                 { .div = 3, .val = 3, },
 118                 { .div = 4, .val = 4, },
 119                 { .div = 5, .val = 5, },
 120                 { .div = 6, .val = 6, },
 121                 { .div = 7, .val = 7, },
 122         };
 123
 124         clk_configs = devm_kzalloc(dev, sizeof(*clk_configs), GFP_KERNEL);
 125         if (!clk_configs)
 126                 return -ENOMEM;
 127
 128         /* get the mux parents from DT */
 129         for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
 130                 char name[16];
 131
 132                 snprintf(name, sizeof(name), "clkin%d", i);
 133                 clk = devm_clk_get(dev, name);
 134                 if (IS_ERR(clk)) {
 135                         ret = PTR_ERR(clk);
 136                         if (ret != -EPROBE_DEFER)
 137                                 dev_err(dev, "Missing clock %s\n", name);
 138                         return ret;
 139                 }
 140
 141                 mux_parent_names[i] = __clk_get_name(clk);
 142         }
 143
 144         clk_configs->m250_mux.reg = dwmac->regs + PRG_ETH0;
 145         clk_configs->m250_mux.shift = PRG_ETH0_CLK_M250_SEL_SHIFT;
 146         clk_configs->m250_mux.mask = PRG_ETH0_CLK_M250_SEL_MASK;
 147         clk = meson8b_dwmac_register_clk(dwmac, "m250_sel", mux_parent_names,
 148                                          MUX_CLK_NUM_PARENTS, &clk_mux_ops,
 149                                          &clk_configs->m250_mux.hw);
 150         if (WARN_ON(IS_ERR(clk)))
 151                 return PTR_ERR(clk);
 152
 153         parent_name = __clk_get_name(clk);
 154         clk_configs->m250_div.reg = dwmac->regs + PRG_ETH0;
 155         clk_configs->m250_div.shift = PRG_ETH0_CLK_M250_DIV_SHIFT;
 156         clk_configs->m250_div.width = PRG_ETH0_CLK_M250_DIV_WIDTH;
 157         clk_configs->m250_div.table = div_table;
 158         clk_configs->m250_div.flags = CLK_DIVIDER_ALLOW_ZERO |
 159                                       CLK_DIVIDER_ROUND_CLOSEST;
 160         clk = meson8b_dwmac_register_clk(dwmac, "m250_div", &parent_name, 1,
 161                                          &clk_divider_ops,
 162                                          &clk_configs->m250_div.hw);
 163         if (WARN_ON(IS_ERR(clk)))
 164                 return PTR_ERR(clk);
 165
 166         parent_name = __clk_get_name(clk);
 167         clk_configs->fixed_div2.mult = 1;
 168         clk_configs->fixed_div2.div = 2;
 169         clk = meson8b_dwmac_register_clk(dwmac, "fixed_div2", &parent_name, 1,
 170                                          &clk_fixed_factor_ops,
 171                                          &clk_configs->fixed_div2.hw);
 172         if (WARN_ON(IS_ERR(clk)))
 173                 return PTR_ERR(clk);
 174
 175         parent_name = __clk_get_name(clk);
 176         clk_configs->rgmii_tx_en.reg = dwmac->regs + PRG_ETH0;
 177         clk_configs->rgmii_tx_en.bit_idx = PRG_ETH0_RGMII_TX_CLK_EN;
 178         clk = meson8b_dwmac_register_clk(dwmac, "rgmii_tx_en", &parent_name, 1,
 179                                          &clk_gate_ops,
 180                                          &clk_configs->rgmii_tx_en.hw);
 181         if (WARN_ON(IS_ERR(clk)))
 182                 return PTR_ERR(clk);
 183
 184         dwmac->rgmii_tx_clk = clk;
 185
 186         return 0;
 187 }
 188
 189 static int meson8b_set_phy_mode(struct meson8b_dwmac *dwmac)
 190 {
 191         switch (dwmac->phy_mode) {
 192         case PHY_INTERFACE_MODE_RGMII:
 193         case PHY_INTERFACE_MODE_RGMII_RXID:
 194         case PHY_INTERFACE_MODE_RGMII_ID:
 195         case PHY_INTERFACE_MODE_RGMII_TXID:
 196                 /* enable RGMII mode */
 197                 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
 198                                         PRG_ETH0_RGMII_MODE,
 199                                         PRG_ETH0_RGMII_MODE);
 200                 break;
 201         case PHY_INTERFACE_MODE_RMII:
 202                 /* disable RGMII mode -> enables RMII mode */
 203                 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
 204                                         PRG_ETH0_RGMII_MODE, 0);
 205                 break;
 206         default:
 207                 dev_err(dwmac->dev, "fail to set phy-mode %s\n",
 208                         phy_modes(dwmac->phy_mode));
 209                 return -EINVAL;
 210         }
 211
 212         return 0;
 213 }
 214
 215 static int meson_axg_set_phy_mode(struct meson8b_dwmac *dwmac)
 216 {
 217         switch (dwmac->phy_mode) {
 218         case PHY_INTERFACE_MODE_RGMII:
 219         case PHY_INTERFACE_MODE_RGMII_RXID:
 220         case PHY_INTERFACE_MODE_RGMII_ID:
 221         case PHY_INTERFACE_MODE_RGMII_TXID:
 222                 /* enable RGMII mode */
 223                 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
 224                                         PRG_ETH0_EXT_PHY_MODE_MASK,
 225                                         PRG_ETH0_EXT_RGMII_MODE);
 226                 break;
 227         case PHY_INTERFACE_MODE_RMII:
 228                 /* disable RGMII mode -> enables RMII mode */
 229                 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
 230                                         PRG_ETH0_EXT_PHY_MODE_MASK,
 231                                         PRG_ETH0_EXT_RMII_MODE);
 232                 break;
 233         default:
 234                 dev_err(dwmac->dev, "fail to set phy-mode %s\n",
 235                         phy_modes(dwmac->phy_mode));
 236                 return -EINVAL;
 237         }
 238
 239         return 0;
 240 }
 241
 242 static int meson8b_init_prg_eth(struct meson8b_dwmac *dwmac)
 243 {
 244         int ret;
 245         u8 tx_dly_val = 0;
 246
 247         switch (dwmac->phy_mode) {
 248         case PHY_INTERFACE_MODE_RGMII:
 249         case PHY_INTERFACE_MODE_RGMII_RXID:
 250                 /* TX clock delay in ns = "8ns / 4 * tx_dly_val" (where
 251                  * 8ns are exactly one cycle of the 125MHz RGMII TX clock):
 252                  * 0ns = 0x0, 2ns = 0x1, 4ns = 0x2, 6ns = 0x3
 253                  */
 254                 tx_dly_val = dwmac->tx_delay_ns >> 1;
 255                 /* fall through */
 256
 257         case PHY_INTERFACE_MODE_RGMII_ID:
 258         case PHY_INTERFACE_MODE_RGMII_TXID:
 259                 /* only relevant for RMII mode -> disable in RGMII mode */
 260                 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
 261                                         PRG_ETH0_INVERTED_RMII_CLK, 0);
 262
 263                 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
 264                                         tx_dly_val << PRG_ETH0_TXDLY_SHIFT);
 265
 266                 /* Configure the 125MHz RGMII TX clock, the IP block changes
 267                  * the output automatically (= without us having to configure
 268                  * a register) based on the line-speed (125MHz for Gbit speeds,
 269                  * 25MHz for 100Mbit/s and 2.5MHz for 10Mbit/s).
 270                  */
 271                 ret = clk_set_rate(dwmac->rgmii_tx_clk, 125 * 1000 * 1000);
 272                 if (ret) {
 273                         dev_err(dwmac->dev,
 274                                 "failed to set RGMII TX clock\n");
 275                         return ret;
 276                 }
 277
 278                 ret = clk_prepare_enable(dwmac->rgmii_tx_clk);
 279                 if (ret) {
 280                         dev_err(dwmac->dev,
 281                                 "failed to enable the RGMII TX clock\n");
 282                         return ret;
 283                 }
 284
 285                 devm_add_action_or_reset(dwmac->dev,
 286                                         (void(*)(void *))clk_disable_unprepare,
 287                                         dwmac->rgmii_tx_clk);
 288                 break;
 289
 290         case PHY_INTERFACE_MODE_RMII:
 291                 /* invert internal clk_rmii_i to generate 25/2.5 tx_rx_clk */
 292                 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0,
 293                                         PRG_ETH0_INVERTED_RMII_CLK,
 294                                         PRG_ETH0_INVERTED_RMII_CLK);
 295
 296                 /* TX clock delay cannot be configured in RMII mode */
 297                 meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TXDLY_MASK,
 298                                         0);
 299
 300                 break;
 301
 302         default:
 303                 dev_err(dwmac->dev, "unsupported phy-mode %s\n",
 304                         phy_modes(dwmac->phy_mode));
 305                 return -EINVAL;
 306         }
 307
 308         /* enable TX_CLK and PHY_REF_CLK generator */
 309         meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TX_AND_PHY_REF_CLK,
 310                                 PRG_ETH0_TX_AND_PHY_REF_CLK);
 311
 312         return 0;
 313 }
 314
 315 static int meson8b_dwmac_probe(struct platform_device *pdev)
 316 {
 317         struct plat_stmmacenet_data *plat_dat;
 318         struct stmmac_resources stmmac_res;
 319         struct meson8b_dwmac *dwmac;
 320         int ret;
 321
 322         ret = stmmac_get_platform_resources(pdev, &stmmac_res);
 323         if (ret)
 324                 return ret;
 325
 326         plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
 327         if (IS_ERR(plat_dat))
 328                 return PTR_ERR(plat_dat);
 329
 330         dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
 331         if (!dwmac) {
 332                 ret = -ENOMEM;
 333                 goto err_remove_config_dt;
 334         }
 335
 336         dwmac->data = (const struct meson8b_dwmac_data *)
 337                 of_device_get_match_data(&pdev->dev);
 338         if (!dwmac->data) {
 339                 ret = -EINVAL;
 340                 goto err_remove_config_dt;
 341         }
 342         dwmac->regs = devm_platform_ioremap_resource(pdev, 1);
 343         if (IS_ERR(dwmac->regs)) {
 344                 ret = PTR_ERR(dwmac->regs);
 345                 goto err_remove_config_dt;
 346         }
 347
 348         dwmac->dev = &pdev->dev;
 349         ret = of_get_phy_mode(pdev->dev.of_node, &dwmac->phy_mode);
 350         if (ret) {
 351                 dev_err(&pdev->dev, "missing phy-mode property\n");
 352                 goto err_remove_config_dt;
 353         }
 354
 355         /* use 2ns as fallback since this value was previously hardcoded */
 356         if (of_property_read_u32(pdev->dev.of_node, "amlogic,tx-delay-ns",
 357                                  &dwmac->tx_delay_ns))
 358                 dwmac->tx_delay_ns = 2;
 359
 360         ret = meson8b_init_rgmii_tx_clk(dwmac);
 361         if (ret)
 362                 goto err_remove_config_dt;
 363
 364         ret = dwmac->data->set_phy_mode(dwmac);
 365         if (ret)
 366                 goto err_remove_config_dt;
 367
 368         ret = meson8b_init_prg_eth(dwmac);
 369         if (ret)
 370                 goto err_remove_config_dt;
 371
 372         plat_dat->bsp_priv = dwmac;
 373
 374         ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
 375         if (ret)
 376                 goto err_remove_config_dt;
 377
 378         return 0;
 379
 380 err_remove_config_dt:
 381         stmmac_remove_config_dt(pdev, plat_dat);
 382
 383         return ret;
 384 }
 385
 386 static const struct meson8b_dwmac_data meson8b_dwmac_data = {
 387         .set_phy_mode = meson8b_set_phy_mode,
 388 };
 389
 390 static const struct meson8b_dwmac_data meson_axg_dwmac_data = {
 391         .set_phy_mode = meson_axg_set_phy_mode,
 392 };
 393
 394 static const struct of_device_id meson8b_dwmac_match[] = {
 395         {
 396                 .compatible = "amlogic,meson8b-dwmac",
 397                 .data = &meson8b_dwmac_data,
 398         },
 399         {
 400                 .compatible = "amlogic,meson8m2-dwmac",
 401                 .data = &meson8b_dwmac_data,
 402         },
 403         {
 404                 .compatible = "amlogic,meson-gxbb-dwmac",
 405                 .data = &meson8b_dwmac_data,
 406         },
 407         {
 408                 .compatible = "amlogic,meson-axg-dwmac",
 409                 .data = &meson_axg_dwmac_data,
 410         },
 411         { }
 412 };
 413 MODULE_DEVICE_TABLE(of, meson8b_dwmac_match);
 414
 415 static struct platform_driver meson8b_dwmac_driver = {
 416         .probe  = meson8b_dwmac_probe,
 417         .remove = stmmac_pltfr_remove,
 418         .driver = {
 419                 .name           = "meson8b-dwmac",
 420                 .pm             = &stmmac_pltfr_pm_ops,
 421                 .of_match_table = meson8b_dwmac_match,
 422         },
 423 };
 424 module_platform_driver(meson8b_dwmac_driver);
 425
 426 MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
 427 MODULE_DESCRIPTION("Amlogic Meson8b, Meson8m2 and GXBB DWMAC glue layer");
 428 MODULE_LICENSE("GPL v2");