drivers/phy/broadcom/phy-bcm-ns-usb3.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Broadcom Northstar USB 3.0 PHY Driver
   4  *
   5  * Copyright (C) 2016 Rafał Miłecki <rafal@milecki.pl>
   6  * Copyright (C) 2016 Broadcom
   7  *
   8  * All magic values used for initialization (and related comments) were obtained
   9  * from Broadcom's SDK:
  10  * Copyright (c) Broadcom Corp, 2012
  11  */
  12
  13 #include <linux/bcma/bcma.h>
  14 #include <linux/delay.h>
  15 #include <linux/err.h>
  16 #include <linux/mdio.h>
  17 #include <linux/module.h>
  18 #include <linux/of_address.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/phy/phy.h>
  22 #include <linux/slab.h>
  23
  24 #define BCM_NS_USB3_MII_MNG_TIMEOUT_US  1000    /* usecs */
  25
  26 #define BCM_NS_USB3_PHY_BASE_ADDR_REG   0x1f
  27 #define BCM_NS_USB3_PHY_PLL30_BLOCK     0x8000
  28 #define BCM_NS_USB3_PHY_TX_PMD_BLOCK    0x8040
  29 #define BCM_NS_USB3_PHY_PIPE_BLOCK      0x8060
  30
  31 /* Registers of PLL30 block */
  32 #define BCM_NS_USB3_PLL_CONTROL         0x01
  33 #define BCM_NS_USB3_PLLA_CONTROL0       0x0a
  34 #define BCM_NS_USB3_PLLA_CONTROL1       0x0b
  35
  36 /* Registers of TX PMD block */
  37 #define BCM_NS_USB3_TX_PMD_CONTROL1     0x01
  38
  39 /* Registers of PIPE block */
  40 #define BCM_NS_USB3_LFPS_CMP            0x02
  41 #define BCM_NS_USB3_LFPS_DEGLITCH       0x03
  42
  43 enum bcm_ns_family {
  44         BCM_NS_UNKNOWN,
  45         BCM_NS_AX,
  46         BCM_NS_BX,
  47 };
  48
  49 struct bcm_ns_usb3 {
  50         struct device *dev;
  51         enum bcm_ns_family family;
  52         void __iomem *dmp;
  53         void __iomem *ccb_mii;
  54         struct mdio_device *mdiodev;
  55         struct phy *phy;
  56
  57         int (*phy_write)(struct bcm_ns_usb3 *usb3, u16 reg, u16 value);
  58 };
  59
  60 static const struct of_device_id bcm_ns_usb3_id_table[] = {
  61         {
  62                 .compatible = "brcm,ns-ax-usb3-phy",
  63                 .data = (int *)BCM_NS_AX,
  64         },
  65         {
  66                 .compatible = "brcm,ns-bx-usb3-phy",
  67                 .data = (int *)BCM_NS_BX,
  68         },
  69         {},
  70 };
  71 MODULE_DEVICE_TABLE(of, bcm_ns_usb3_id_table);
  72
  73 static int bcm_ns_usb3_mdio_phy_write(struct bcm_ns_usb3 *usb3, u16 reg,
  74                                       u16 value)
  75 {
  76         return usb3->phy_write(usb3, reg, value);
  77 }
  78
  79 static int bcm_ns_usb3_phy_init_ns_bx(struct bcm_ns_usb3 *usb3)
  80 {
  81         int err;
  82
  83         /* USB3 PLL Block */
  84         err = bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG,
  85                                          BCM_NS_USB3_PHY_PLL30_BLOCK);
  86         if (err < 0)
  87                 return err;
  88
  89         /* Assert Ana_Pllseq start */
  90         bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLL_CONTROL, 0x1000);
  91
  92         /* Assert CML Divider ratio to 26 */
  93         bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLLA_CONTROL0, 0x6400);
  94
  95         /* Asserting PLL Reset */
  96         bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLLA_CONTROL1, 0xc000);
  97
  98         /* Deaaserting PLL Reset */
  99         bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLLA_CONTROL1, 0x8000);
 100
 101         /* Deasserting USB3 system reset */
 102         writel(0, usb3->dmp + BCMA_RESET_CTL);
 103
 104         /* PLL frequency monitor enable */
 105         bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLL_CONTROL, 0x9000);
 106
 107         /* PIPE Block */
 108         bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG,
 109                                    BCM_NS_USB3_PHY_PIPE_BLOCK);
 110
 111         /* CMPMAX & CMPMINTH setting */
 112         bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_LFPS_CMP, 0xf30d);
 113
 114         /* DEGLITCH MIN & MAX setting */
 115         bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_LFPS_DEGLITCH, 0x6302);
 116
 117         /* TXPMD block */
 118         bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG,
 119                                    BCM_NS_USB3_PHY_TX_PMD_BLOCK);
 120
 121         /* Enabling SSC */
 122         bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_TX_PMD_CONTROL1, 0x1003);
 123
 124         return 0;
 125 }
 126
 127 static int bcm_ns_usb3_phy_init_ns_ax(struct bcm_ns_usb3 *usb3)
 128 {
 129         int err;
 130
 131         /* PLL30 block */
 132         err = bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG,
 133                                          BCM_NS_USB3_PHY_PLL30_BLOCK);
 134         if (err < 0)
 135                 return err;
 136
 137         bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLLA_CONTROL0, 0x6400);
 138
 139         bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG, 0x80e0);
 140
 141         bcm_ns_usb3_mdio_phy_write(usb3, 0x02, 0x009c);
 142
 143         /* Enable SSC */
 144         bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG,
 145                                    BCM_NS_USB3_PHY_TX_PMD_BLOCK);
 146
 147         bcm_ns_usb3_mdio_phy_write(usb3, 0x02, 0x21d3);
 148
 149         bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_TX_PMD_CONTROL1, 0x1003);
 150
 151         /* Deasserting USB3 system reset */
 152         writel(0, usb3->dmp + BCMA_RESET_CTL);
 153
 154         return 0;
 155 }
 156
 157 static int bcm_ns_usb3_phy_init(struct phy *phy)
 158 {
 159         struct bcm_ns_usb3 *usb3 = phy_get_drvdata(phy);
 160         int err;
 161
 162         /* Perform USB3 system soft reset */
 163         writel(BCMA_RESET_CTL_RESET, usb3->dmp + BCMA_RESET_CTL);
 164
 165         switch (usb3->family) {
 166         case BCM_NS_AX:
 167                 err = bcm_ns_usb3_phy_init_ns_ax(usb3);
 168                 break;
 169         case BCM_NS_BX:
 170                 err = bcm_ns_usb3_phy_init_ns_bx(usb3);
 171                 break;
 172         default:
 173                 WARN_ON(1);
 174                 err = -ENOTSUPP;
 175         }
 176
 177         return err;
 178 }
 179
 180 static const struct phy_ops ops = {
 181         .init           = bcm_ns_usb3_phy_init,
 182         .owner          = THIS_MODULE,
 183 };
 184
 185 /**************************************************
 186  * MDIO driver code
 187  **************************************************/
 188
 189 static int bcm_ns_usb3_mdiodev_phy_write(struct bcm_ns_usb3 *usb3, u16 reg,
 190                                          u16 value)
 191 {
 192         struct mdio_device *mdiodev = usb3->mdiodev;
 193
 194         return mdiobus_write(mdiodev->bus, mdiodev->addr, reg, value);
 195 }
 196
 197 static int bcm_ns_usb3_mdio_probe(struct mdio_device *mdiodev)
 198 {
 199         struct device *dev = &mdiodev->dev;
 200         const struct of_device_id *of_id;
 201         struct phy_provider *phy_provider;
 202         struct device_node *syscon_np;
 203         struct bcm_ns_usb3 *usb3;
 204         struct resource res;
 205         int err;
 206
 207         usb3 = devm_kzalloc(dev, sizeof(*usb3), GFP_KERNEL);
 208         if (!usb3)
 209                 return -ENOMEM;
 210
 211         usb3->dev = dev;
 212         usb3->mdiodev = mdiodev;
 213
 214         of_id = of_match_device(bcm_ns_usb3_id_table, dev);
 215         if (!of_id)
 216                 return -EINVAL;
 217         usb3->family = (enum bcm_ns_family)of_id->data;
 218
 219         syscon_np = of_parse_phandle(dev->of_node, "usb3-dmp-syscon", 0);
 220         err = of_address_to_resource(syscon_np, 0, &res);
 221         of_node_put(syscon_np);
 222         if (err)
 223                 return err;
 224
 225         usb3->dmp = devm_ioremap_resource(dev, &res);
 226         if (IS_ERR(usb3->dmp)) {
 227                 dev_err(dev, "Failed to map DMP regs\n");
 228                 return PTR_ERR(usb3->dmp);
 229         }
 230
 231         usb3->phy_write = bcm_ns_usb3_mdiodev_phy_write;
 232
 233         usb3->phy = devm_phy_create(dev, NULL, &ops);
 234         if (IS_ERR(usb3->phy)) {
 235                 dev_err(dev, "Failed to create PHY\n");
 236                 return PTR_ERR(usb3->phy);
 237         }
 238
 239         phy_set_drvdata(usb3->phy, usb3);
 240
 241         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 242
 243         return PTR_ERR_OR_ZERO(phy_provider);
 244 }
 245
 246 static struct mdio_driver bcm_ns_usb3_mdio_driver = {
 247         .mdiodrv = {
 248                 .driver = {
 249                         .name = "bcm_ns_mdio_usb3",
 250                         .of_match_table = bcm_ns_usb3_id_table,
 251                 },
 252         },
 253         .probe = bcm_ns_usb3_mdio_probe,
 254 };
 255
 256 /**************************************************
 257  * Platform driver code
 258  **************************************************/
 259
 260 static int bcm_ns_usb3_wait_reg(struct bcm_ns_usb3 *usb3, void __iomem *addr,
 261                                 u32 mask, u32 value, unsigned long timeout)
 262 {
 263         unsigned long deadline = jiffies + timeout;
 264         u32 val;
 265
 266         do {
 267                 val = readl(addr);
 268                 if ((val & mask) == value)
 269                         return 0;
 270                 cpu_relax();
 271                 udelay(10);
 272         } while (!time_after_eq(jiffies, deadline));
 273
 274         dev_err(usb3->dev, "Timeout waiting for register %p\n", addr);
 275
 276         return -EBUSY;
 277 }
 278
 279 static inline int bcm_ns_usb3_mii_mng_wait_idle(struct bcm_ns_usb3 *usb3)
 280 {
 281         return bcm_ns_usb3_wait_reg(usb3, usb3->ccb_mii + BCMA_CCB_MII_MNG_CTL,
 282                                     0x0100, 0x0000,
 283                                     usecs_to_jiffies(BCM_NS_USB3_MII_MNG_TIMEOUT_US));
 284 }
 285
 286 static int bcm_ns_usb3_platform_phy_write(struct bcm_ns_usb3 *usb3, u16 reg,
 287                                           u16 value)
 288 {
 289         u32 tmp = 0;
 290         int err;
 291
 292         err = bcm_ns_usb3_mii_mng_wait_idle(usb3);
 293         if (err < 0) {
 294                 dev_err(usb3->dev, "Couldn't write 0x%08x value\n", value);
 295                 return err;
 296         }
 297
 298         /* TODO: Use a proper MDIO bus layer */
 299         tmp |= 0x58020000; /* Magic value for MDIO PHY write */
 300         tmp |= reg << 18;
 301         tmp |= value;
 302         writel(tmp, usb3->ccb_mii + BCMA_CCB_MII_MNG_CMD_DATA);
 303
 304         return bcm_ns_usb3_mii_mng_wait_idle(usb3);
 305 }
 306
 307 static int bcm_ns_usb3_probe(struct platform_device *pdev)
 308 {
 309         struct device *dev = &pdev->dev;
 310         const struct of_device_id *of_id;
 311         struct bcm_ns_usb3 *usb3;
 312         struct resource *res;
 313         struct phy_provider *phy_provider;
 314
 315         usb3 = devm_kzalloc(dev, sizeof(*usb3), GFP_KERNEL);
 316         if (!usb3)
 317                 return -ENOMEM;
 318
 319         usb3->dev = dev;
 320
 321         of_id = of_match_device(bcm_ns_usb3_id_table, dev);
 322         if (!of_id)
 323                 return -EINVAL;
 324         usb3->family = (enum bcm_ns_family)of_id->data;
 325
 326         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dmp");
 327         usb3->dmp = devm_ioremap_resource(dev, res);
 328         if (IS_ERR(usb3->dmp)) {
 329                 dev_err(dev, "Failed to map DMP regs\n");
 330                 return PTR_ERR(usb3->dmp);
 331         }
 332
 333         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ccb-mii");
 334         usb3->ccb_mii = devm_ioremap_resource(dev, res);
 335         if (IS_ERR(usb3->ccb_mii)) {
 336                 dev_err(dev, "Failed to map ChipCommon B MII regs\n");
 337                 return PTR_ERR(usb3->ccb_mii);
 338         }
 339
 340         /* Enable MDIO. Setting MDCDIV as 26  */
 341         writel(0x0000009a, usb3->ccb_mii + BCMA_CCB_MII_MNG_CTL);
 342
 343         /* Wait for MDIO? */
 344         udelay(2);
 345
 346         usb3->phy_write = bcm_ns_usb3_platform_phy_write;
 347
 348         usb3->phy = devm_phy_create(dev, NULL, &ops);
 349         if (IS_ERR(usb3->phy)) {
 350                 dev_err(dev, "Failed to create PHY\n");
 351                 return PTR_ERR(usb3->phy);
 352         }
 353
 354         phy_set_drvdata(usb3->phy, usb3);
 355         platform_set_drvdata(pdev, usb3);
 356
 357         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 358         if (!IS_ERR(phy_provider))
 359                 dev_info(dev, "Registered Broadcom Northstar USB 3.0 PHY driver\n");
 360
 361         return PTR_ERR_OR_ZERO(phy_provider);
 362 }
 363
 364 static struct platform_driver bcm_ns_usb3_driver = {
 365         .probe          = bcm_ns_usb3_probe,
 366         .driver = {
 367                 .name = "bcm_ns_usb3",
 368                 .of_match_table = bcm_ns_usb3_id_table,
 369         },
 370 };
 371
 372 static int __init bcm_ns_usb3_module_init(void)
 373 {
 374         int err;
 375
 376         /*
 377          * For backward compatibility we register as MDIO and platform driver.
 378          * After getting MDIO binding commonly used (e.g. switching all DT files
 379          * to use it) we should deprecate the old binding and eventually drop
 380          * support for it.
 381          */
 382
 383         err = mdio_driver_register(&bcm_ns_usb3_mdio_driver);
 384         if (err)
 385                 return err;
 386
 387         err = platform_driver_register(&bcm_ns_usb3_driver);
 388         if (err)
 389                 mdio_driver_unregister(&bcm_ns_usb3_mdio_driver);
 390
 391         return err;
 392 }
 393 module_init(bcm_ns_usb3_module_init);
 394
 395 static void __exit bcm_ns_usb3_module_exit(void)
 396 {
 397         platform_driver_unregister(&bcm_ns_usb3_driver);
 398         mdio_driver_unregister(&bcm_ns_usb3_mdio_driver);
 399 }
 400 module_exit(bcm_ns_usb3_module_exit)
 401
 402 MODULE_LICENSE("GPL v2");