drivers/net/ethernet/stmicro/stmmac/hwif.c

   1 // SPDX-License-Identifier: (GPL-2.0 OR MIT)
   2 /*
   3  * Copyright (c) 2018 Synopsys, Inc. and/or its affiliates.
   4  * stmmac HW Interface Handling
   5  */
   6
   7 #include "common.h"
   8 #include "stmmac.h"
   9 #include "stmmac_ptp.h"
  10
  11 static u32 stmmac_get_id(struct stmmac_priv *priv, u32 id_reg)
  12 {
  13         u32 reg = readl(priv->ioaddr + id_reg);
  14
  15         if (!reg) {
  16                 dev_info(priv->device, "Version ID not available\n");
  17                 return 0x0;
  18         }
  19
  20         dev_info(priv->device, "User ID: 0x%x, Synopsys ID: 0x%x\n",
  21                         (unsigned int)(reg & GENMASK(15, 8)) >> 8,
  22                         (unsigned int)(reg & GENMASK(7, 0)));
  23         return reg & GENMASK(7, 0);
  24 }
  25
  26 static u32 stmmac_get_dev_id(struct stmmac_priv *priv, u32 id_reg)
  27 {
  28         u32 reg = readl(priv->ioaddr + id_reg);
  29
  30         if (!reg) {
  31                 dev_info(priv->device, "Version ID not available\n");
  32                 return 0x0;
  33         }
  34
  35         return (reg & GENMASK(15, 8)) >> 8;
  36 }
  37
  38 static void stmmac_dwmac_mode_quirk(struct stmmac_priv *priv)
  39 {
  40         struct mac_device_info *mac = priv->hw;
  41
  42         if (priv->chain_mode) {
  43                 dev_info(priv->device, "Chain mode enabled\n");
  44                 priv->mode = STMMAC_CHAIN_MODE;
  45                 mac->mode = &chain_mode_ops;
  46         } else {
  47                 dev_info(priv->device, "Ring mode enabled\n");
  48                 priv->mode = STMMAC_RING_MODE;
  49                 mac->mode = &ring_mode_ops;
  50         }
  51 }
  52
  53 static int stmmac_dwmac1_quirks(struct stmmac_priv *priv)
  54 {
  55         struct mac_device_info *mac = priv->hw;
  56
  57         if (priv->plat->enh_desc) {
  58                 dev_info(priv->device, "Enhanced/Alternate descriptors\n");
  59
  60                 /* GMAC older than 3.50 has no extended descriptors */
  61                 if (priv->synopsys_id >= DWMAC_CORE_3_50) {
  62                         dev_info(priv->device, "Enabled extended descriptors\n");
  63                         priv->extend_desc = 1;
  64                 } else {
  65                         dev_warn(priv->device, "Extended descriptors not supported\n");
  66                 }
  67
  68                 mac->desc = &enh_desc_ops;
  69         } else {
  70                 dev_info(priv->device, "Normal descriptors\n");
  71                 mac->desc = &ndesc_ops;
  72         }
  73
  74         stmmac_dwmac_mode_quirk(priv);
  75         return 0;
  76 }
  77
  78 static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
  79 {
  80         stmmac_dwmac_mode_quirk(priv);
  81         return 0;
  82 }
  83
  84 static int stmmac_dwxlgmac_quirks(struct stmmac_priv *priv)
  85 {
  86         priv->hw->xlgmac = true;
  87         return 0;
  88 }
  89
  90 static const struct stmmac_hwif_entry {
  91         bool gmac;
  92         bool gmac4;
  93         bool xgmac;
  94         u32 min_id;
  95         u32 dev_id;
  96         const struct stmmac_regs_off regs;
  97         const void *desc;
  98         const void *dma;
  99         const void *mac;
 100         const void *hwtimestamp;
 101         const void *mode;
 102         const void *tc;
 103         const void *mmc;
 104         int (*setup)(struct stmmac_priv *priv);
 105         int (*quirks)(struct stmmac_priv *priv);
 106 } stmmac_hw[] = {
 107         /* NOTE: New HW versions shall go to the end of this table */
 108         {
 109                 .gmac = false,
 110                 .gmac4 = false,
 111                 .xgmac = false,
 112                 .min_id = 0,
 113                 .regs = {
 114                         .ptp_off = PTP_GMAC3_X_OFFSET,
 115                         .mmc_off = MMC_GMAC3_X_OFFSET,
 116                 },
 117                 .desc = NULL,
 118                 .dma = &dwmac100_dma_ops,
 119                 .mac = &dwmac100_ops,
 120                 .hwtimestamp = &stmmac_ptp,
 121                 .mode = NULL,
 122                 .tc = NULL,
 123                 .mmc = &dwmac_mmc_ops,
 124                 .setup = dwmac100_setup,
 125                 .quirks = stmmac_dwmac1_quirks,
 126         }, {
 127                 .gmac = true,
 128                 .gmac4 = false,
 129                 .xgmac = false,
 130                 .min_id = 0,
 131                 .regs = {
 132                         .ptp_off = PTP_GMAC3_X_OFFSET,
 133                         .mmc_off = MMC_GMAC3_X_OFFSET,
 134                 },
 135                 .desc = NULL,
 136                 .dma = &dwmac1000_dma_ops,
 137                 .mac = &dwmac1000_ops,
 138                 .hwtimestamp = &stmmac_ptp,
 139                 .mode = NULL,
 140                 .tc = NULL,
 141                 .mmc = &dwmac_mmc_ops,
 142                 .setup = dwmac1000_setup,
 143                 .quirks = stmmac_dwmac1_quirks,
 144         }, {
 145                 .gmac = false,
 146                 .gmac4 = true,
 147                 .xgmac = false,
 148                 .min_id = 0,
 149                 .regs = {
 150                         .ptp_off = PTP_GMAC4_OFFSET,
 151                         .mmc_off = MMC_GMAC4_OFFSET,
 152                 },
 153                 .desc = &dwmac4_desc_ops,
 154                 .dma = &dwmac4_dma_ops,
 155                 .mac = &dwmac4_ops,
 156                 .hwtimestamp = &stmmac_ptp,
 157                 .mode = NULL,
 158                 .tc = &dwmac510_tc_ops,
 159                 .mmc = &dwmac_mmc_ops,
 160                 .setup = dwmac4_setup,
 161                 .quirks = stmmac_dwmac4_quirks,
 162         }, {
 163                 .gmac = false,
 164                 .gmac4 = true,
 165                 .xgmac = false,
 166                 .min_id = DWMAC_CORE_4_00,
 167                 .regs = {
 168                         .ptp_off = PTP_GMAC4_OFFSET,
 169                         .mmc_off = MMC_GMAC4_OFFSET,
 170                 },
 171                 .desc = &dwmac4_desc_ops,
 172                 .dma = &dwmac4_dma_ops,
 173                 .mac = &dwmac410_ops,
 174                 .hwtimestamp = &stmmac_ptp,
 175                 .mode = &dwmac4_ring_mode_ops,
 176                 .tc = &dwmac510_tc_ops,
 177                 .mmc = &dwmac_mmc_ops,
 178                 .setup = dwmac4_setup,
 179                 .quirks = NULL,
 180         }, {
 181                 .gmac = false,
 182                 .gmac4 = true,
 183                 .xgmac = false,
 184                 .min_id = DWMAC_CORE_4_10,
 185                 .regs = {
 186                         .ptp_off = PTP_GMAC4_OFFSET,
 187                         .mmc_off = MMC_GMAC4_OFFSET,
 188                 },
 189                 .desc = &dwmac4_desc_ops,
 190                 .dma = &dwmac410_dma_ops,
 191                 .mac = &dwmac410_ops,
 192                 .hwtimestamp = &stmmac_ptp,
 193                 .mode = &dwmac4_ring_mode_ops,
 194                 .tc = &dwmac510_tc_ops,
 195                 .mmc = &dwmac_mmc_ops,
 196                 .setup = dwmac4_setup,
 197                 .quirks = NULL,
 198         }, {
 199                 .gmac = false,
 200                 .gmac4 = true,
 201                 .xgmac = false,
 202                 .min_id = DWMAC_CORE_5_10,
 203                 .regs = {
 204                         .ptp_off = PTP_GMAC4_OFFSET,
 205                         .mmc_off = MMC_GMAC4_OFFSET,
 206                 },
 207                 .desc = &dwmac4_desc_ops,
 208                 .dma = &dwmac410_dma_ops,
 209                 .mac = &dwmac510_ops,
 210                 .hwtimestamp = &stmmac_ptp,
 211                 .mode = &dwmac4_ring_mode_ops,
 212                 .tc = &dwmac510_tc_ops,
 213                 .mmc = &dwmac_mmc_ops,
 214                 .setup = dwmac4_setup,
 215                 .quirks = NULL,
 216         }, {
 217                 .gmac = false,
 218                 .gmac4 = false,
 219                 .xgmac = true,
 220                 .min_id = DWXGMAC_CORE_2_10,
 221                 .dev_id = DWXGMAC_ID,
 222                 .regs = {
 223                         .ptp_off = PTP_XGMAC_OFFSET,
 224                         .mmc_off = MMC_XGMAC_OFFSET,
 225                 },
 226                 .desc = &dwxgmac210_desc_ops,
 227                 .dma = &dwxgmac210_dma_ops,
 228                 .mac = &dwxgmac210_ops,
 229                 .hwtimestamp = &stmmac_ptp,
 230                 .mode = NULL,
 231                 .tc = &dwmac510_tc_ops,
 232                 .mmc = &dwxgmac_mmc_ops,
 233                 .setup = dwxgmac2_setup,
 234                 .quirks = NULL,
 235         }, {
 236                 .gmac = false,
 237                 .gmac4 = false,
 238                 .xgmac = true,
 239                 .min_id = DWXLGMAC_CORE_2_00,
 240                 .dev_id = DWXLGMAC_ID,
 241                 .regs = {
 242                         .ptp_off = PTP_XGMAC_OFFSET,
 243                         .mmc_off = MMC_XGMAC_OFFSET,
 244                 },
 245                 .desc = &dwxgmac210_desc_ops,
 246                 .dma = &dwxgmac210_dma_ops,
 247                 .mac = &dwxlgmac2_ops,
 248                 .hwtimestamp = &stmmac_ptp,
 249                 .mode = NULL,
 250                 .tc = &dwmac510_tc_ops,
 251                 .mmc = &dwxgmac_mmc_ops,
 252                 .setup = dwxlgmac2_setup,
 253                 .quirks = stmmac_dwxlgmac_quirks,
 254         },
 255 };
 256
 257 int stmmac_hwif_init(struct stmmac_priv *priv)
 258 {
 259         bool needs_xgmac = priv->plat->has_xgmac;
 260         bool needs_gmac4 = priv->plat->has_gmac4;
 261         bool needs_gmac = priv->plat->has_gmac;
 262         const struct stmmac_hwif_entry *entry;
 263         struct mac_device_info *mac;
 264         bool needs_setup = true;
 265         u32 id, dev_id = 0;
 266         int i, ret;
 267
 268         if (needs_gmac) {
 269                 id = stmmac_get_id(priv, GMAC_VERSION);
 270         } else if (needs_gmac4 || needs_xgmac) {
 271                 id = stmmac_get_id(priv, GMAC4_VERSION);
 272                 if (needs_xgmac)
 273                         dev_id = stmmac_get_dev_id(priv, GMAC4_VERSION);
 274         } else {
 275                 id = 0;
 276         }
 277
 278         /* Save ID for later use */
 279         priv->synopsys_id = id;
 280
 281         /* Lets assume some safe values first */
 282         priv->ptpaddr = priv->ioaddr +
 283                 (needs_gmac4 ? PTP_GMAC4_OFFSET : PTP_GMAC3_X_OFFSET);
 284         priv->mmcaddr = priv->ioaddr +
 285                 (needs_gmac4 ? MMC_GMAC4_OFFSET : MMC_GMAC3_X_OFFSET);
 286
 287         /* Check for HW specific setup first */
 288         if (priv->plat->setup) {
 289                 mac = priv->plat->setup(priv);
 290                 needs_setup = false;
 291         } else {
 292                 mac = devm_kzalloc(priv->device, sizeof(*mac), GFP_KERNEL);
 293         }
 294
 295         if (!mac)
 296                 return -ENOMEM;
 297
 298         /* Fallback to generic HW */
 299         for (i = ARRAY_SIZE(stmmac_hw) - 1; i >= 0; i--) {
 300                 entry = &stmmac_hw[i];
 301
 302                 if (needs_gmac ^ entry->gmac)
 303                         continue;
 304                 if (needs_gmac4 ^ entry->gmac4)
 305                         continue;
 306                 if (needs_xgmac ^ entry->xgmac)
 307                         continue;
 308                 /* Use synopsys_id var because some setups can override this */
 309                 if (priv->synopsys_id < entry->min_id)
 310                         continue;
 311                 if (needs_xgmac && (dev_id ^ entry->dev_id))
 312                         continue;
 313
 314                 /* Only use generic HW helpers if needed */
 315                 mac->desc = mac->desc ? : entry->desc;
 316                 mac->dma = mac->dma ? : entry->dma;
 317                 mac->mac = mac->mac ? : entry->mac;
 318                 mac->ptp = mac->ptp ? : entry->hwtimestamp;
 319                 mac->mode = mac->mode ? : entry->mode;
 320                 mac->tc = mac->tc ? : entry->tc;
 321                 mac->mmc = mac->mmc ? : entry->mmc;
 322
 323                 priv->hw = mac;
 324                 priv->ptpaddr = priv->ioaddr + entry->regs.ptp_off;
 325                 priv->mmcaddr = priv->ioaddr + entry->regs.mmc_off;
 326
 327                 /* Entry found */
 328                 if (needs_setup) {
 329                         ret = entry->setup(priv);
 330                         if (ret)
 331                                 return ret;
 332                 }
 333
 334                 /* Save quirks, if needed for posterior use */
 335                 priv->hwif_quirks = entry->quirks;
 336                 return 0;
 337         }
 338
 339         dev_err(priv->device, "Failed to find HW IF (id=0x%x, gmac=%d/%d)\n",
 340                         id, needs_gmac, needs_gmac4);
 341         return -EINVAL;
 342 }