drivers/phy/socionext/phy-uniphier-usb3ss.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * phy-uniphier-usb3ss.c - SS-PHY driver for Socionext UniPhier USB3 controller
   4  * Copyright 2015-2018 Socionext Inc.
   5  * Author:
   6  *      Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
   7  * Contributors:
   8  *      Motoya Tanigawa <tanigawa.motoya@socionext.com>
   9  *      Masami Hiramatsu <masami.hiramatsu@linaro.org>
  10  */
  11
  12 #include <linux/bitfield.h>
  13 #include <linux/bitops.h>
  14 #include <linux/clk.h>
  15 #include <linux/io.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/of_platform.h>
  19 #include <linux/phy/phy.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/regulator/consumer.h>
  22 #include <linux/reset.h>
  23
  24 #define SSPHY_TESTI             0x0
  25 #define SSPHY_TESTO             0x4
  26 #define TESTI_DAT_MASK          GENMASK(13, 6)
  27 #define TESTI_ADR_MASK          GENMASK(5, 1)
  28 #define TESTI_WR_EN             BIT(0)
  29
  30 #define PHY_F(regno, msb, lsb) { (regno), (msb), (lsb) }
  31
  32 #define CDR_CPD_TRIM    PHY_F(7, 3, 0)  /* RxPLL charge pump current */
  33 #define CDR_CPF_TRIM    PHY_F(8, 3, 0)  /* RxPLL charge pump current 2 */
  34 #define TX_PLL_TRIM     PHY_F(9, 3, 0)  /* TxPLL charge pump current */
  35 #define BGAP_TRIM       PHY_F(11, 3, 0) /* Bandgap voltage */
  36 #define CDR_TRIM        PHY_F(13, 6, 5) /* Clock Data Recovery setting */
  37 #define VCO_CTRL        PHY_F(26, 7, 4) /* VCO control */
  38 #define VCOPLL_CTRL     PHY_F(27, 2, 0) /* TxPLL VCO tuning */
  39 #define VCOPLL_CM       PHY_F(28, 1, 0) /* TxPLL voltage */
  40
  41 #define MAX_PHY_PARAMS  7
  42
  43 struct uniphier_u3ssphy_param {
  44         struct {
  45                 int reg_no;
  46                 int msb;
  47                 int lsb;
  48         } field;
  49         u8 value;
  50 };
  51
  52 struct uniphier_u3ssphy_priv {
  53         struct device *dev;
  54         void __iomem *base;
  55         struct clk *clk, *clk_ext, *clk_parent, *clk_parent_gio;
  56         struct reset_control *rst, *rst_parent, *rst_parent_gio;
  57         struct regulator *vbus;
  58         const struct uniphier_u3ssphy_soc_data *data;
  59 };
  60
  61 struct uniphier_u3ssphy_soc_data {
  62         bool is_legacy;
  63         int nparams;
  64         const struct uniphier_u3ssphy_param param[MAX_PHY_PARAMS];
  65 };
  66
  67 static void uniphier_u3ssphy_testio_write(struct uniphier_u3ssphy_priv *priv,
  68                                           u32 data)
  69 {
  70         /* need to read TESTO twice after accessing TESTI */
  71         writel(data, priv->base + SSPHY_TESTI);
  72         readl(priv->base + SSPHY_TESTO);
  73         readl(priv->base + SSPHY_TESTO);
  74 }
  75
  76 static void uniphier_u3ssphy_set_param(struct uniphier_u3ssphy_priv *priv,
  77                                        const struct uniphier_u3ssphy_param *p)
  78 {
  79         u32 val;
  80         u8 field_mask = GENMASK(p->field.msb, p->field.lsb);
  81         u8 data;
  82
  83         /* read previous data */
  84         val  = FIELD_PREP(TESTI_DAT_MASK, 1);
  85         val |= FIELD_PREP(TESTI_ADR_MASK, p->field.reg_no);
  86         uniphier_u3ssphy_testio_write(priv, val);
  87         val = readl(priv->base + SSPHY_TESTO);
  88
  89         /* update value */
  90         val &= ~FIELD_PREP(TESTI_DAT_MASK, field_mask);
  91         data = field_mask & (p->value << p->field.lsb);
  92         val  = FIELD_PREP(TESTI_DAT_MASK, data);
  93         val |= FIELD_PREP(TESTI_ADR_MASK, p->field.reg_no);
  94         uniphier_u3ssphy_testio_write(priv, val);
  95         uniphier_u3ssphy_testio_write(priv, val | TESTI_WR_EN);
  96         uniphier_u3ssphy_testio_write(priv, val);
  97
  98         /* read current data as dummy */
  99         val  = FIELD_PREP(TESTI_DAT_MASK, 1);
 100         val |= FIELD_PREP(TESTI_ADR_MASK, p->field.reg_no);
 101         uniphier_u3ssphy_testio_write(priv, val);
 102         readl(priv->base + SSPHY_TESTO);
 103 }
 104
 105 static int uniphier_u3ssphy_power_on(struct phy *phy)
 106 {
 107         struct uniphier_u3ssphy_priv *priv = phy_get_drvdata(phy);
 108         int ret;
 109
 110         ret = clk_prepare_enable(priv->clk_ext);
 111         if (ret)
 112                 return ret;
 113
 114         ret = clk_prepare_enable(priv->clk);
 115         if (ret)
 116                 goto out_clk_ext_disable;
 117
 118         ret = reset_control_deassert(priv->rst);
 119         if (ret)
 120                 goto out_clk_disable;
 121
 122         if (priv->vbus) {
 123                 ret = regulator_enable(priv->vbus);
 124                 if (ret)
 125                         goto out_rst_assert;
 126         }
 127
 128         return 0;
 129
 130 out_rst_assert:
 131         reset_control_assert(priv->rst);
 132 out_clk_disable:
 133         clk_disable_unprepare(priv->clk);
 134 out_clk_ext_disable:
 135         clk_disable_unprepare(priv->clk_ext);
 136
 137         return ret;
 138 }
 139
 140 static int uniphier_u3ssphy_power_off(struct phy *phy)
 141 {
 142         struct uniphier_u3ssphy_priv *priv = phy_get_drvdata(phy);
 143
 144         if (priv->vbus)
 145                 regulator_disable(priv->vbus);
 146
 147         reset_control_assert(priv->rst);
 148         clk_disable_unprepare(priv->clk);
 149         clk_disable_unprepare(priv->clk_ext);
 150
 151         return 0;
 152 }
 153
 154 static int uniphier_u3ssphy_init(struct phy *phy)
 155 {
 156         struct uniphier_u3ssphy_priv *priv = phy_get_drvdata(phy);
 157         int i, ret;
 158
 159         ret = clk_prepare_enable(priv->clk_parent);
 160         if (ret)
 161                 return ret;
 162
 163         ret = clk_prepare_enable(priv->clk_parent_gio);
 164         if (ret)
 165                 goto out_clk_disable;
 166
 167         ret = reset_control_deassert(priv->rst_parent);
 168         if (ret)
 169                 goto out_clk_gio_disable;
 170
 171         ret = reset_control_deassert(priv->rst_parent_gio);
 172         if (ret)
 173                 goto out_rst_assert;
 174
 175         if (priv->data->is_legacy)
 176                 return 0;
 177
 178         for (i = 0; i < priv->data->nparams; i++)
 179                 uniphier_u3ssphy_set_param(priv, &priv->data->param[i]);
 180
 181         return 0;
 182
 183 out_rst_assert:
 184         reset_control_assert(priv->rst_parent);
 185 out_clk_gio_disable:
 186         clk_disable_unprepare(priv->clk_parent_gio);
 187 out_clk_disable:
 188         clk_disable_unprepare(priv->clk_parent);
 189
 190         return ret;
 191 }
 192
 193 static int uniphier_u3ssphy_exit(struct phy *phy)
 194 {
 195         struct uniphier_u3ssphy_priv *priv = phy_get_drvdata(phy);
 196
 197         reset_control_assert(priv->rst_parent_gio);
 198         reset_control_assert(priv->rst_parent);
 199         clk_disable_unprepare(priv->clk_parent_gio);
 200         clk_disable_unprepare(priv->clk_parent);
 201
 202         return 0;
 203 }
 204
 205 static const struct phy_ops uniphier_u3ssphy_ops = {
 206         .init           = uniphier_u3ssphy_init,
 207         .exit           = uniphier_u3ssphy_exit,
 208         .power_on       = uniphier_u3ssphy_power_on,
 209         .power_off      = uniphier_u3ssphy_power_off,
 210         .owner          = THIS_MODULE,
 211 };
 212
 213 static int uniphier_u3ssphy_probe(struct platform_device *pdev)
 214 {
 215         struct device *dev = &pdev->dev;
 216         struct uniphier_u3ssphy_priv *priv;
 217         struct phy_provider *phy_provider;
 218         struct resource *res;
 219         struct phy *phy;
 220
 221         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 222         if (!priv)
 223                 return -ENOMEM;
 224
 225         priv->dev = dev;
 226         priv->data = of_device_get_match_data(dev);
 227         if (WARN_ON(!priv->data ||
 228                     priv->data->nparams > MAX_PHY_PARAMS))
 229                 return -EINVAL;
 230
 231         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 232         priv->base = devm_ioremap_resource(dev, res);
 233         if (IS_ERR(priv->base))
 234                 return PTR_ERR(priv->base);
 235
 236         if (!priv->data->is_legacy) {
 237                 priv->clk = devm_clk_get(dev, "phy");
 238                 if (IS_ERR(priv->clk))
 239                         return PTR_ERR(priv->clk);
 240
 241                 priv->clk_ext = devm_clk_get_optional(dev, "phy-ext");
 242                 if (IS_ERR(priv->clk_ext))
 243                         return PTR_ERR(priv->clk_ext);
 244
 245                 priv->rst = devm_reset_control_get_shared(dev, "phy");
 246                 if (IS_ERR(priv->rst))
 247                         return PTR_ERR(priv->rst);
 248         } else {
 249                 priv->clk_parent_gio = devm_clk_get(dev, "gio");
 250                 if (IS_ERR(priv->clk_parent_gio))
 251                         return PTR_ERR(priv->clk_parent_gio);
 252
 253                 priv->rst_parent_gio =
 254                         devm_reset_control_get_shared(dev, "gio");
 255                 if (IS_ERR(priv->rst_parent_gio))
 256                         return PTR_ERR(priv->rst_parent_gio);
 257         }
 258
 259         priv->clk_parent = devm_clk_get(dev, "link");
 260         if (IS_ERR(priv->clk_parent))
 261                 return PTR_ERR(priv->clk_parent);
 262
 263         priv->rst_parent = devm_reset_control_get_shared(dev, "link");
 264         if (IS_ERR(priv->rst_parent))
 265                 return PTR_ERR(priv->rst_parent);
 266
 267         priv->vbus = devm_regulator_get_optional(dev, "vbus");
 268         if (IS_ERR(priv->vbus)) {
 269                 if (PTR_ERR(priv->vbus) == -EPROBE_DEFER)
 270                         return PTR_ERR(priv->vbus);
 271                 priv->vbus = NULL;
 272         }
 273
 274         phy = devm_phy_create(dev, dev->of_node, &uniphier_u3ssphy_ops);
 275         if (IS_ERR(phy))
 276                 return PTR_ERR(phy);
 277
 278         phy_set_drvdata(phy, priv);
 279         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 280
 281         return PTR_ERR_OR_ZERO(phy_provider);
 282 }
 283
 284 static const struct uniphier_u3ssphy_soc_data uniphier_pro4_data = {
 285         .is_legacy = true,
 286 };
 287
 288 static const struct uniphier_u3ssphy_soc_data uniphier_pxs2_data = {
 289         .is_legacy = false,
 290         .nparams = 7,
 291         .param = {
 292                 { CDR_CPD_TRIM, 10 },
 293                 { CDR_CPF_TRIM, 3 },
 294                 { TX_PLL_TRIM, 5 },
 295                 { BGAP_TRIM, 9 },
 296                 { CDR_TRIM, 2 },
 297                 { VCOPLL_CTRL, 7 },
 298                 { VCOPLL_CM, 1 },
 299         },
 300 };
 301
 302 static const struct uniphier_u3ssphy_soc_data uniphier_ld20_data = {
 303         .is_legacy = false,
 304         .nparams = 3,
 305         .param = {
 306                 { CDR_CPD_TRIM, 6 },
 307                 { CDR_TRIM, 2 },
 308                 { VCO_CTRL, 5 },
 309         },
 310 };
 311
 312 static const struct of_device_id uniphier_u3ssphy_match[] = {
 313         {
 314                 .compatible = "socionext,uniphier-pro4-usb3-ssphy",
 315                 .data = &uniphier_pro4_data,
 316         },
 317         {
 318                 .compatible = "socionext,uniphier-pxs2-usb3-ssphy",
 319                 .data = &uniphier_pxs2_data,
 320         },
 321         {
 322                 .compatible = "socionext,uniphier-ld20-usb3-ssphy",
 323                 .data = &uniphier_ld20_data,
 324         },
 325         {
 326                 .compatible = "socionext,uniphier-pxs3-usb3-ssphy",
 327                 .data = &uniphier_ld20_data,
 328         },
 329         { /* sentinel */ }
 330 };
 331 MODULE_DEVICE_TABLE(of, uniphier_u3ssphy_match);
 332
 333 static struct platform_driver uniphier_u3ssphy_driver = {
 334         .probe = uniphier_u3ssphy_probe,
 335         .driver = {
 336                 .name = "uniphier-usb3-ssphy",
 337                 .of_match_table = uniphier_u3ssphy_match,
 338         },
 339 };
 340
 341 module_platform_driver(uniphier_u3ssphy_driver);
 342
 343 MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
 344 MODULE_DESCRIPTION("UniPhier SS-PHY driver for USB3 controller");
 345 MODULE_LICENSE("GPL v2");