drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c

   1 /*
   2  * Qualcomm Atheros IPQ806x GMAC glue layer
   3  *
   4  * Copyright (C) 2015 The Linux Foundation
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include <linux/device.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/phy.h>
  22 #include <linux/regmap.h>
  23 #include <linux/clk.h>
  24 #include <linux/reset.h>
  25 #include <linux/of_net.h>
  26 #include <linux/mfd/syscon.h>
  27 #include <linux/stmmac.h>
  28 #include <linux/of_mdio.h>
  29 #include <linux/module.h>
  30
  31 #include "stmmac_platform.h"
  32
  33 #define NSS_COMMON_CLK_GATE                     0x8
  34 #define NSS_COMMON_CLK_GATE_PTP_EN(x)           BIT(0x10 + x)
  35 #define NSS_COMMON_CLK_GATE_RGMII_RX_EN(x)      BIT(0x9 + (x * 2))
  36 #define NSS_COMMON_CLK_GATE_RGMII_TX_EN(x)      BIT(0x8 + (x * 2))
  37 #define NSS_COMMON_CLK_GATE_GMII_RX_EN(x)       BIT(0x4 + x)
  38 #define NSS_COMMON_CLK_GATE_GMII_TX_EN(x)       BIT(0x0 + x)
  39
  40 #define NSS_COMMON_CLK_DIV0                     0xC
  41 #define NSS_COMMON_CLK_DIV_OFFSET(x)            (x * 8)
  42 #define NSS_COMMON_CLK_DIV_MASK                 0x7f
  43
  44 #define NSS_COMMON_CLK_SRC_CTRL                 0x14
  45 #define NSS_COMMON_CLK_SRC_CTRL_OFFSET(x)       (x)
  46 /* Mode is coded on 1 bit but is different depending on the MAC ID:
  47  * MAC0: QSGMII=0 RGMII=1
  48  * MAC1: QSGMII=0 SGMII=0 RGMII=1
  49  * MAC2 & MAC3: QSGMII=0 SGMII=1
  50  */
  51 #define NSS_COMMON_CLK_SRC_CTRL_RGMII(x)        1
  52 #define NSS_COMMON_CLK_SRC_CTRL_SGMII(x)        ((x >= 2) ? 1 : 0)
  53
  54 #define NSS_COMMON_MACSEC_CTL                   0x28
  55 #define NSS_COMMON_MACSEC_CTL_EXT_BYPASS_EN(x)  (1 << x)
  56
  57 #define NSS_COMMON_GMAC_CTL(x)                  (0x30 + (x * 4))
  58 #define NSS_COMMON_GMAC_CTL_CSYS_REQ            BIT(19)
  59 #define NSS_COMMON_GMAC_CTL_PHY_IFACE_SEL       BIT(16)
  60 #define NSS_COMMON_GMAC_CTL_IFG_LIMIT_OFFSET    8
  61 #define NSS_COMMON_GMAC_CTL_IFG_OFFSET          0
  62 #define NSS_COMMON_GMAC_CTL_IFG_MASK            0x3f
  63
  64 #define NSS_COMMON_CLK_DIV_RGMII_1000           1
  65 #define NSS_COMMON_CLK_DIV_RGMII_100            9
  66 #define NSS_COMMON_CLK_DIV_RGMII_10             99
  67 #define NSS_COMMON_CLK_DIV_SGMII_1000           0
  68 #define NSS_COMMON_CLK_DIV_SGMII_100            4
  69 #define NSS_COMMON_CLK_DIV_SGMII_10             49
  70
  71 #define QSGMII_PCS_MODE_CTL                     0x68
  72 #define QSGMII_PCS_MODE_CTL_AUTONEG_EN(x)       BIT((x * 8) + 7)
  73
  74 #define QSGMII_PCS_CAL_LCKDT_CTL                0x120
  75 #define QSGMII_PCS_CAL_LCKDT_CTL_RST            BIT(19)
  76
  77 /* Only GMAC1/2/3 support SGMII and their CTL register are not contiguous */
  78 #define QSGMII_PHY_SGMII_CTL(x)                 ((x == 1) ? 0x134 : \
  79                                                  (0x13c + (4 * (x - 2))))
  80 #define QSGMII_PHY_CDR_EN                       BIT(0)
  81 #define QSGMII_PHY_RX_FRONT_EN                  BIT(1)
  82 #define QSGMII_PHY_RX_SIGNAL_DETECT_EN          BIT(2)
  83 #define QSGMII_PHY_TX_DRIVER_EN                 BIT(3)
  84 #define QSGMII_PHY_QSGMII_EN                    BIT(7)
  85 #define QSGMII_PHY_PHASE_LOOP_GAIN_OFFSET       12
  86 #define QSGMII_PHY_PHASE_LOOP_GAIN_MASK         0x7
  87 #define QSGMII_PHY_RX_DC_BIAS_OFFSET            18
  88 #define QSGMII_PHY_RX_DC_BIAS_MASK              0x3
  89 #define QSGMII_PHY_RX_INPUT_EQU_OFFSET          20
  90 #define QSGMII_PHY_RX_INPUT_EQU_MASK            0x3
  91 #define QSGMII_PHY_CDR_PI_SLEW_OFFSET           22
  92 #define QSGMII_PHY_CDR_PI_SLEW_MASK             0x3
  93 #define QSGMII_PHY_TX_DRV_AMP_OFFSET            28
  94 #define QSGMII_PHY_TX_DRV_AMP_MASK              0xf
  95
  96 struct ipq806x_gmac {
  97         struct platform_device *pdev;
  98         struct regmap *nss_common;
  99         struct regmap *qsgmii_csr;
 100         uint32_t id;
 101         struct clk *core_clk;
 102         phy_interface_t phy_mode;
 103 };
 104
 105 static int get_clk_div_sgmii(struct ipq806x_gmac *gmac, unsigned int speed)
 106 {
 107         struct device *dev = &gmac->pdev->dev;
 108         int div;
 109
 110         switch (speed) {
 111         case SPEED_1000:
 112                 div = NSS_COMMON_CLK_DIV_SGMII_1000;
 113                 break;
 114
 115         case SPEED_100:
 116                 div = NSS_COMMON_CLK_DIV_SGMII_100;
 117                 break;
 118
 119         case SPEED_10:
 120                 div = NSS_COMMON_CLK_DIV_SGMII_10;
 121                 break;
 122
 123         default:
 124                 dev_err(dev, "Speed %dMbps not supported in SGMII\n", speed);
 125                 return -EINVAL;
 126         }
 127
 128         return div;
 129 }
 130
 131 static int get_clk_div_rgmii(struct ipq806x_gmac *gmac, unsigned int speed)
 132 {
 133         struct device *dev = &gmac->pdev->dev;
 134         int div;
 135
 136         switch (speed) {
 137         case SPEED_1000:
 138                 div = NSS_COMMON_CLK_DIV_RGMII_1000;
 139                 break;
 140
 141         case SPEED_100:
 142                 div = NSS_COMMON_CLK_DIV_RGMII_100;
 143                 break;
 144
 145         case SPEED_10:
 146                 div = NSS_COMMON_CLK_DIV_RGMII_10;
 147                 break;
 148
 149         default:
 150                 dev_err(dev, "Speed %dMbps not supported in RGMII\n", speed);
 151                 return -EINVAL;
 152         }
 153
 154         return div;
 155 }
 156
 157 static int ipq806x_gmac_set_speed(struct ipq806x_gmac *gmac, unsigned int speed)
 158 {
 159         uint32_t clk_bits, val;
 160         int div;
 161
 162         switch (gmac->phy_mode) {
 163         case PHY_INTERFACE_MODE_RGMII:
 164                 div = get_clk_div_rgmii(gmac, speed);
 165                 clk_bits = NSS_COMMON_CLK_GATE_RGMII_RX_EN(gmac->id) |
 166                            NSS_COMMON_CLK_GATE_RGMII_TX_EN(gmac->id);
 167                 break;
 168
 169         case PHY_INTERFACE_MODE_SGMII:
 170                 div = get_clk_div_sgmii(gmac, speed);
 171                 clk_bits = NSS_COMMON_CLK_GATE_GMII_RX_EN(gmac->id) |
 172                            NSS_COMMON_CLK_GATE_GMII_TX_EN(gmac->id);
 173                 break;
 174
 175         default:
 176                 dev_err(&gmac->pdev->dev, "Unsupported PHY mode: \"%s\"\n",
 177                         phy_modes(gmac->phy_mode));
 178                 return -EINVAL;
 179         }
 180
 181         /* Disable the clocks */
 182         regmap_read(gmac->nss_common, NSS_COMMON_CLK_GATE, &val);
 183         val &= ~clk_bits;
 184         regmap_write(gmac->nss_common, NSS_COMMON_CLK_GATE, val);
 185
 186         /* Set the divider */
 187         regmap_read(gmac->nss_common, NSS_COMMON_CLK_DIV0, &val);
 188         val &= ~(NSS_COMMON_CLK_DIV_MASK
 189                  << NSS_COMMON_CLK_DIV_OFFSET(gmac->id));
 190         val |= div << NSS_COMMON_CLK_DIV_OFFSET(gmac->id);
 191         regmap_write(gmac->nss_common, NSS_COMMON_CLK_DIV0, val);
 192
 193         /* Enable the clock back */
 194         regmap_read(gmac->nss_common, NSS_COMMON_CLK_GATE, &val);
 195         val |= clk_bits;
 196         regmap_write(gmac->nss_common, NSS_COMMON_CLK_GATE, val);
 197
 198         return 0;
 199 }
 200
 201 static void *ipq806x_gmac_of_parse(struct ipq806x_gmac *gmac)
 202 {
 203         struct device *dev = &gmac->pdev->dev;
 204
 205         gmac->phy_mode = of_get_phy_mode(dev->of_node);
 206         if (gmac->phy_mode < 0) {
 207                 dev_err(dev, "missing phy mode property\n");
 208                 return ERR_PTR(-EINVAL);
 209         }
 210
 211         if (of_property_read_u32(dev->of_node, "qcom,id", &gmac->id) < 0) {
 212                 dev_err(dev, "missing qcom id property\n");
 213                 return ERR_PTR(-EINVAL);
 214         }
 215
 216         /* The GMACs are called 1 to 4 in the documentation, but to simplify the
 217          * code and keep it consistent with the Linux convention, we'll number
 218          * them from 0 to 3 here.
 219          */
 220         if (gmac->id < 0 || gmac->id > 3) {
 221                 dev_err(dev, "invalid gmac id\n");
 222                 return ERR_PTR(-EINVAL);
 223         }
 224
 225         gmac->core_clk = devm_clk_get(dev, "stmmaceth");
 226         if (IS_ERR(gmac->core_clk)) {
 227                 dev_err(dev, "missing stmmaceth clk property\n");
 228                 return gmac->core_clk;
 229         }
 230         clk_set_rate(gmac->core_clk, 266000000);
 231
 232         /* Setup the register map for the nss common registers */
 233         gmac->nss_common = syscon_regmap_lookup_by_phandle(dev->of_node,
 234                                                            "qcom,nss-common");
 235         if (IS_ERR(gmac->nss_common)) {
 236                 dev_err(dev, "missing nss-common node\n");
 237                 return gmac->nss_common;
 238         }
 239
 240         /* Setup the register map for the qsgmii csr registers */
 241         gmac->qsgmii_csr = syscon_regmap_lookup_by_phandle(dev->of_node,
 242                                                            "qcom,qsgmii-csr");
 243         if (IS_ERR(gmac->qsgmii_csr)) {
 244                 dev_err(dev, "missing qsgmii-csr node\n");
 245                 return gmac->qsgmii_csr;
 246         }
 247
 248         return NULL;
 249 }
 250
 251 static void ipq806x_gmac_fix_mac_speed(void *priv, unsigned int speed)
 252 {
 253         struct ipq806x_gmac *gmac = priv;
 254
 255         ipq806x_gmac_set_speed(gmac, speed);
 256 }
 257
 258 static int ipq806x_gmac_probe(struct platform_device *pdev)
 259 {
 260         struct plat_stmmacenet_data *plat_dat;
 261         struct stmmac_resources stmmac_res;
 262         struct device *dev = &pdev->dev;
 263         struct ipq806x_gmac *gmac;
 264         int val;
 265         void *err;
 266
 267         val = stmmac_get_platform_resources(pdev, &stmmac_res);
 268         if (val)
 269                 return val;
 270
 271         plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
 272         if (IS_ERR(plat_dat))
 273                 return PTR_ERR(plat_dat);
 274
 275         gmac = devm_kzalloc(dev, sizeof(*gmac), GFP_KERNEL);
 276         if (!gmac)
 277                 return -ENOMEM;
 278
 279         gmac->pdev = pdev;
 280
 281         err = ipq806x_gmac_of_parse(gmac);
 282         if (IS_ERR(err)) {
 283                 dev_err(dev, "device tree parsing error\n");
 284                 return PTR_ERR(err);
 285         }
 286
 287         regmap_write(gmac->qsgmii_csr, QSGMII_PCS_CAL_LCKDT_CTL,
 288                      QSGMII_PCS_CAL_LCKDT_CTL_RST);
 289
 290         /* Inter frame gap is set to 12 */
 291         val = 12 << NSS_COMMON_GMAC_CTL_IFG_OFFSET |
 292               12 << NSS_COMMON_GMAC_CTL_IFG_LIMIT_OFFSET;
 293         /* We also initiate an AXI low power exit request */
 294         val |= NSS_COMMON_GMAC_CTL_CSYS_REQ;
 295         switch (gmac->phy_mode) {
 296         case PHY_INTERFACE_MODE_RGMII:
 297                 val |= NSS_COMMON_GMAC_CTL_PHY_IFACE_SEL;
 298                 break;
 299         case PHY_INTERFACE_MODE_SGMII:
 300                 val &= ~NSS_COMMON_GMAC_CTL_PHY_IFACE_SEL;
 301                 break;
 302         default:
 303                 dev_err(&pdev->dev, "Unsupported PHY mode: \"%s\"\n",
 304                         phy_modes(gmac->phy_mode));
 305                 return -EINVAL;
 306         }
 307         regmap_write(gmac->nss_common, NSS_COMMON_GMAC_CTL(gmac->id), val);
 308
 309         /* Configure the clock src according to the mode */
 310         regmap_read(gmac->nss_common, NSS_COMMON_CLK_SRC_CTRL, &val);
 311         val &= ~(1 << NSS_COMMON_CLK_SRC_CTRL_OFFSET(gmac->id));
 312         switch (gmac->phy_mode) {
 313         case PHY_INTERFACE_MODE_RGMII:
 314                 val |= NSS_COMMON_CLK_SRC_CTRL_RGMII(gmac->id) <<
 315                         NSS_COMMON_CLK_SRC_CTRL_OFFSET(gmac->id);
 316                 break;
 317         case PHY_INTERFACE_MODE_SGMII:
 318                 val |= NSS_COMMON_CLK_SRC_CTRL_SGMII(gmac->id) <<
 319                         NSS_COMMON_CLK_SRC_CTRL_OFFSET(gmac->id);
 320                 break;
 321         default:
 322                 dev_err(&pdev->dev, "Unsupported PHY mode: \"%s\"\n",
 323                         phy_modes(gmac->phy_mode));
 324                 return -EINVAL;
 325         }
 326         regmap_write(gmac->nss_common, NSS_COMMON_CLK_SRC_CTRL, val);
 327
 328         /* Enable PTP clock */
 329         regmap_read(gmac->nss_common, NSS_COMMON_CLK_GATE, &val);
 330         val |= NSS_COMMON_CLK_GATE_PTP_EN(gmac->id);
 331         regmap_write(gmac->nss_common, NSS_COMMON_CLK_GATE, val);
 332
 333         if (gmac->phy_mode == PHY_INTERFACE_MODE_SGMII) {
 334                 regmap_write(gmac->qsgmii_csr, QSGMII_PHY_SGMII_CTL(gmac->id),
 335                              QSGMII_PHY_CDR_EN |
 336                              QSGMII_PHY_RX_FRONT_EN |
 337                              QSGMII_PHY_RX_SIGNAL_DETECT_EN |
 338                              QSGMII_PHY_TX_DRIVER_EN |
 339                              QSGMII_PHY_QSGMII_EN |
 340                              0x4ul << QSGMII_PHY_PHASE_LOOP_GAIN_OFFSET |
 341                              0x3ul << QSGMII_PHY_RX_DC_BIAS_OFFSET |
 342                              0x1ul << QSGMII_PHY_RX_INPUT_EQU_OFFSET |
 343                              0x2ul << QSGMII_PHY_CDR_PI_SLEW_OFFSET |
 344                              0xCul << QSGMII_PHY_TX_DRV_AMP_OFFSET);
 345         }
 346
 347         plat_dat->has_gmac = true;
 348         plat_dat->bsp_priv = gmac;
 349         plat_dat->fix_mac_speed = ipq806x_gmac_fix_mac_speed;
 350
 351         return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
 352 }
 353
 354 static const struct of_device_id ipq806x_gmac_dwmac_match[] = {
 355         { .compatible = "qcom,ipq806x-gmac" },
 356         { }
 357 };
 358 MODULE_DEVICE_TABLE(of, ipq806x_gmac_dwmac_match);
 359
 360 static struct platform_driver ipq806x_gmac_dwmac_driver = {
 361         .probe = ipq806x_gmac_probe,
 362         .remove = stmmac_pltfr_remove,
 363         .driver = {
 364                 .name           = "ipq806x-gmac-dwmac",
 365                 .pm             = &stmmac_pltfr_pm_ops,
 366                 .of_match_table = ipq806x_gmac_dwmac_match,
 367         },
 368 };
 369 module_platform_driver(ipq806x_gmac_dwmac_driver);
 370
 371 MODULE_AUTHOR("Mathieu Olivari <mathieu@codeaurora.org>");
 372 MODULE_DESCRIPTION("Qualcomm Atheros IPQ806x DWMAC specific glue layer");
 373 MODULE_LICENSE("Dual BSD/GPL");