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

   1 /*
   2  * Broadcom Northstar USB 3.0 PHY Driver
   3  *
   4  * Copyright (C) 2016 Rafał Miłecki <rafal@milecki.pl>
   5  *
   6  * All magic values used for initialization (and related comments) were obtained
   7  * from Broadcom's SDK:
   8  * Copyright (c) Broadcom Corp, 2012
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/bcma/bcma.h>
  16 #include <linux/delay.h>
  17 #include <linux/err.h>
  18 #include <linux/module.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 enum bcm_ns_family {
  27         BCM_NS_UNKNOWN,
  28         BCM_NS_AX,
  29         BCM_NS_BX,
  30 };
  31
  32 struct bcm_ns_usb3 {
  33         struct device *dev;
  34         enum bcm_ns_family family;
  35         void __iomem *dmp;
  36         void __iomem *ccb_mii;
  37         struct phy *phy;
  38 };
  39
  40 static const struct of_device_id bcm_ns_usb3_id_table[] = {
  41         {
  42                 .compatible = "brcm,ns-ax-usb3-phy",
  43                 .data = (int *)BCM_NS_AX,
  44         },
  45         {
  46                 .compatible = "brcm,ns-bx-usb3-phy",
  47                 .data = (int *)BCM_NS_BX,
  48         },
  49         {},
  50 };
  51 MODULE_DEVICE_TABLE(of, bcm_ns_usb3_id_table);
  52
  53 static int bcm_ns_usb3_wait_reg(struct bcm_ns_usb3 *usb3, void __iomem *addr,
  54                                 u32 mask, u32 value, unsigned long timeout)
  55 {
  56         unsigned long deadline = jiffies + timeout;
  57         u32 val;
  58
  59         do {
  60                 val = readl(addr);
  61                 if ((val & mask) == value)
  62                         return 0;
  63                 cpu_relax();
  64                 udelay(10);
  65         } while (!time_after_eq(jiffies, deadline));
  66
  67         dev_err(usb3->dev, "Timeout waiting for register %p\n", addr);
  68
  69         return -EBUSY;
  70 }
  71
  72 static inline int bcm_ns_usb3_mii_mng_wait_idle(struct bcm_ns_usb3 *usb3)
  73 {
  74         return bcm_ns_usb3_wait_reg(usb3, usb3->ccb_mii + BCMA_CCB_MII_MNG_CTL,
  75                                     0x0100, 0x0000,
  76                                     usecs_to_jiffies(BCM_NS_USB3_MII_MNG_TIMEOUT_US));
  77 }
  78
  79 static int bcm_ns_usb3_mii_mng_write32(struct bcm_ns_usb3 *usb3, u32 value)
  80 {
  81         int err;
  82
  83         err = bcm_ns_usb3_mii_mng_wait_idle(usb3);
  84         if (err < 0) {
  85                 dev_err(usb3->dev, "Couldn't write 0x%08x value\n", value);
  86                 return err;
  87         }
  88
  89         writel(value, usb3->ccb_mii + BCMA_CCB_MII_MNG_CMD_DATA);
  90
  91         return 0;
  92 }
  93
  94 static int bcm_ns_usb3_phy_init_ns_bx(struct bcm_ns_usb3 *usb3)
  95 {
  96         int err;
  97
  98         /* Enable MDIO. Setting MDCDIV as 26  */
  99         writel(0x0000009a, usb3->ccb_mii + BCMA_CCB_MII_MNG_CTL);
 100
 101         /* Wait for MDIO? */
 102         udelay(2);
 103
 104         /* USB3 PLL Block */
 105         err = bcm_ns_usb3_mii_mng_write32(usb3, 0x587e8000);
 106         if (err < 0)
 107                 return err;
 108
 109         /* Assert Ana_Pllseq start */
 110         bcm_ns_usb3_mii_mng_write32(usb3, 0x58061000);
 111
 112         /* Assert CML Divider ratio to 26 */
 113         bcm_ns_usb3_mii_mng_write32(usb3, 0x582a6400);
 114
 115         /* Asserting PLL Reset */
 116         bcm_ns_usb3_mii_mng_write32(usb3, 0x582ec000);
 117
 118         /* Deaaserting PLL Reset */
 119         bcm_ns_usb3_mii_mng_write32(usb3, 0x582e8000);
 120
 121         /* Waiting MII Mgt interface idle */
 122         bcm_ns_usb3_mii_mng_wait_idle(usb3);
 123
 124         /* Deasserting USB3 system reset */
 125         writel(0, usb3->dmp + BCMA_RESET_CTL);
 126
 127         /* PLL frequency monitor enable */
 128         bcm_ns_usb3_mii_mng_write32(usb3, 0x58069000);
 129
 130         /* PIPE Block */
 131         bcm_ns_usb3_mii_mng_write32(usb3, 0x587e8060);
 132
 133         /* CMPMAX & CMPMINTH setting */
 134         bcm_ns_usb3_mii_mng_write32(usb3, 0x580af30d);
 135
 136         /* DEGLITCH MIN & MAX setting */
 137         bcm_ns_usb3_mii_mng_write32(usb3, 0x580e6302);
 138
 139         /* TXPMD block */
 140         bcm_ns_usb3_mii_mng_write32(usb3, 0x587e8040);
 141
 142         /* Enabling SSC */
 143         bcm_ns_usb3_mii_mng_write32(usb3, 0x58061003);
 144
 145         /* Waiting MII Mgt interface idle */
 146         bcm_ns_usb3_mii_mng_wait_idle(usb3);
 147
 148         return 0;
 149 }
 150
 151 static int bcm_ns_usb3_phy_init_ns_ax(struct bcm_ns_usb3 *usb3)
 152 {
 153         int err;
 154
 155         /* Enable MDIO. Setting MDCDIV as 26  */
 156         writel(0x0000009a, usb3->ccb_mii + BCMA_CCB_MII_MNG_CTL);
 157
 158         /* Wait for MDIO? */
 159         udelay(2);
 160
 161         /* PLL30 block */
 162         err = bcm_ns_usb3_mii_mng_write32(usb3, 0x587e8000);
 163         if (err < 0)
 164                 return err;
 165
 166         bcm_ns_usb3_mii_mng_write32(usb3, 0x582a6400);
 167
 168         bcm_ns_usb3_mii_mng_write32(usb3, 0x587e80e0);
 169
 170         bcm_ns_usb3_mii_mng_write32(usb3, 0x580a009c);
 171
 172         /* Enable SSC */
 173         bcm_ns_usb3_mii_mng_write32(usb3, 0x587e8040);
 174
 175         bcm_ns_usb3_mii_mng_write32(usb3, 0x580a21d3);
 176
 177         bcm_ns_usb3_mii_mng_write32(usb3, 0x58061003);
 178
 179         /* Waiting MII Mgt interface idle */
 180         bcm_ns_usb3_mii_mng_wait_idle(usb3);
 181
 182         /* Deasserting USB3 system reset */
 183         writel(0, usb3->dmp + BCMA_RESET_CTL);
 184
 185         return 0;
 186 }
 187
 188 static int bcm_ns_usb3_phy_init(struct phy *phy)
 189 {
 190         struct bcm_ns_usb3 *usb3 = phy_get_drvdata(phy);
 191         int err;
 192
 193         /* Perform USB3 system soft reset */
 194         writel(BCMA_RESET_CTL_RESET, usb3->dmp + BCMA_RESET_CTL);
 195
 196         switch (usb3->family) {
 197         case BCM_NS_AX:
 198                 err = bcm_ns_usb3_phy_init_ns_ax(usb3);
 199                 break;
 200         case BCM_NS_BX:
 201                 err = bcm_ns_usb3_phy_init_ns_bx(usb3);
 202                 break;
 203         default:
 204                 WARN_ON(1);
 205                 err = -ENOTSUPP;
 206         }
 207
 208         return err;
 209 }
 210
 211 static const struct phy_ops ops = {
 212         .init           = bcm_ns_usb3_phy_init,
 213         .owner          = THIS_MODULE,
 214 };
 215
 216 static int bcm_ns_usb3_probe(struct platform_device *pdev)
 217 {
 218         struct device *dev = &pdev->dev;
 219         const struct of_device_id *of_id;
 220         struct bcm_ns_usb3 *usb3;
 221         struct resource *res;
 222         struct phy_provider *phy_provider;
 223
 224         usb3 = devm_kzalloc(dev, sizeof(*usb3), GFP_KERNEL);
 225         if (!usb3)
 226                 return -ENOMEM;
 227
 228         usb3->dev = dev;
 229
 230         of_id = of_match_device(bcm_ns_usb3_id_table, dev);
 231         if (!of_id)
 232                 return -EINVAL;
 233         usb3->family = (enum bcm_ns_family)of_id->data;
 234
 235         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dmp");
 236         usb3->dmp = devm_ioremap_resource(dev, res);
 237         if (IS_ERR(usb3->dmp)) {
 238                 dev_err(dev, "Failed to map DMP regs\n");
 239                 return PTR_ERR(usb3->dmp);
 240         }
 241
 242         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ccb-mii");
 243         usb3->ccb_mii = devm_ioremap_resource(dev, res);
 244         if (IS_ERR(usb3->ccb_mii)) {
 245                 dev_err(dev, "Failed to map ChipCommon B MII regs\n");
 246                 return PTR_ERR(usb3->ccb_mii);
 247         }
 248
 249         usb3->phy = devm_phy_create(dev, NULL, &ops);
 250         if (IS_ERR(usb3->phy)) {
 251                 dev_err(dev, "Failed to create PHY\n");
 252                 return PTR_ERR(usb3->phy);
 253         }
 254
 255         phy_set_drvdata(usb3->phy, usb3);
 256         platform_set_drvdata(pdev, usb3);
 257
 258         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 259         if (!IS_ERR(phy_provider))
 260                 dev_info(dev, "Registered Broadcom Northstar USB 3.0 PHY driver\n");
 261
 262         return PTR_ERR_OR_ZERO(phy_provider);
 263 }
 264
 265 static struct platform_driver bcm_ns_usb3_driver = {
 266         .probe          = bcm_ns_usb3_probe,
 267         .driver = {
 268                 .name = "bcm_ns_usb3",
 269                 .of_match_table = bcm_ns_usb3_id_table,
 270         },
 271 };
 272 module_platform_driver(bcm_ns_usb3_driver);
 273
 274 MODULE_LICENSE("GPL v2");