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/iopoll.h> 17 #include <linux/mdio.h> 18 #include <linux/module.h> 19 #include <linux/of_address.h> 20 #include <linux/of_platform.h> 21 #include <linux/platform_device.h> 22 #include <linux/phy/phy.h> 23 #include <linux/slab.h> 24 25 #define BCM_NS_USB3_PHY_BASE_ADDR_REG 0x1f 26 #define BCM_NS_USB3_PHY_PLL30_BLOCK 0x8000 27 #define BCM_NS_USB3_PHY_TX_PMD_BLOCK 0x8040 28 #define BCM_NS_USB3_PHY_PIPE_BLOCK 0x8060 29 30 /* Registers of PLL30 block */ 31 #define BCM_NS_USB3_PLL_CONTROL 0x01 32 #define BCM_NS_USB3_PLLA_CONTROL0 0x0a 33 #define BCM_NS_USB3_PLLA_CONTROL1 0x0b 34 35 /* Registers of TX PMD block */ 36 #define BCM_NS_USB3_TX_PMD_CONTROL1 0x01 37 38 /* Registers of PIPE block */ 39 #define BCM_NS_USB3_LFPS_CMP 0x02 40 #define BCM_NS_USB3_LFPS_DEGLITCH 0x03 41 42 enum bcm_ns_family { 43 BCM_NS_UNKNOWN, 44 BCM_NS_AX, 45 BCM_NS_BX, 46 }; 47 48 struct bcm_ns_usb3 { 49 struct device *dev; 50 enum bcm_ns_family family; 51 void __iomem *dmp; 52 struct mdio_device *mdiodev; 53 struct phy *phy; 54 }; 55 56 static const struct of_device_id bcm_ns_usb3_id_table[] = { 57 { 58 .compatible = "brcm,ns-ax-usb3-phy", 59 .data = (int *)BCM_NS_AX, 60 }, 61 { 62 .compatible = "brcm,ns-bx-usb3-phy", 63 .data = (int *)BCM_NS_BX, 64 }, 65 {}, 66 }; 67 68 static int bcm_ns_usb3_mdio_phy_write(struct bcm_ns_usb3 *usb3, u16 reg, 69 u16 value); 70 71 static int bcm_ns_usb3_phy_init_ns_bx(struct bcm_ns_usb3 *usb3) 72 { 73 int err; 74 75 /* USB3 PLL Block */ 76 err = bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG, 77 BCM_NS_USB3_PHY_PLL30_BLOCK); 78 if (err < 0) 79 return err; 80 81 /* Assert Ana_Pllseq start */ 82 bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLL_CONTROL, 0x1000); 83 84 /* Assert CML Divider ratio to 26 */ 85 bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLLA_CONTROL0, 0x6400); 86 87 /* Asserting PLL Reset */ 88 bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLLA_CONTROL1, 0xc000); 89 90 /* Deaaserting PLL Reset */ 91 bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLLA_CONTROL1, 0x8000); 92 93 /* Deasserting USB3 system reset */ 94 writel(0, usb3->dmp + BCMA_RESET_CTL); 95 96 /* PLL frequency monitor enable */ 97 bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLL_CONTROL, 0x9000); 98 99 /* PIPE Block */ 100 bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG, 101 BCM_NS_USB3_PHY_PIPE_BLOCK); 102 103 /* CMPMAX & CMPMINTH setting */ 104 bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_LFPS_CMP, 0xf30d); 105 106 /* DEGLITCH MIN & MAX setting */ 107 bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_LFPS_DEGLITCH, 0x6302); 108 109 /* TXPMD block */ 110 bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG, 111 BCM_NS_USB3_PHY_TX_PMD_BLOCK); 112 113 /* Enabling SSC */ 114 bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_TX_PMD_CONTROL1, 0x1003); 115 116 return 0; 117 } 118 119 static int bcm_ns_usb3_phy_init_ns_ax(struct bcm_ns_usb3 *usb3) 120 { 121 int err; 122 123 /* PLL30 block */ 124 err = bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG, 125 BCM_NS_USB3_PHY_PLL30_BLOCK); 126 if (err < 0) 127 return err; 128 129 bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PLLA_CONTROL0, 0x6400); 130 131 bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG, 0x80e0); 132 133 bcm_ns_usb3_mdio_phy_write(usb3, 0x02, 0x009c); 134 135 /* Enable SSC */ 136 bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_PHY_BASE_ADDR_REG, 137 BCM_NS_USB3_PHY_TX_PMD_BLOCK); 138 139 bcm_ns_usb3_mdio_phy_write(usb3, 0x02, 0x21d3); 140 141 bcm_ns_usb3_mdio_phy_write(usb3, BCM_NS_USB3_TX_PMD_CONTROL1, 0x1003); 142 143 /* Deasserting USB3 system reset */ 144 writel(0, usb3->dmp + BCMA_RESET_CTL); 145 146 return 0; 147 } 148 149 static int bcm_ns_usb3_phy_init(struct phy *phy) 150 { 151 struct bcm_ns_usb3 *usb3 = phy_get_drvdata(phy); 152 int err; 153 154 /* Perform USB3 system soft reset */ 155 writel(BCMA_RESET_CTL_RESET, usb3->dmp + BCMA_RESET_CTL); 156 157 switch (usb3->family) { 158 case BCM_NS_AX: 159 err = bcm_ns_usb3_phy_init_ns_ax(usb3); 160 break; 161 case BCM_NS_BX: 162 err = bcm_ns_usb3_phy_init_ns_bx(usb3); 163 break; 164 default: 165 WARN_ON(1); 166 err = -ENOTSUPP; 167 } 168 169 return err; 170 } 171 172 static const struct phy_ops ops = { 173 .init = bcm_ns_usb3_phy_init, 174 .owner = THIS_MODULE, 175 }; 176 177 /************************************************** 178 * MDIO driver code 179 **************************************************/ 180 181 static int bcm_ns_usb3_mdio_phy_write(struct bcm_ns_usb3 *usb3, u16 reg, 182 u16 value) 183 { 184 struct mdio_device *mdiodev = usb3->mdiodev; 185 186 return mdiobus_write(mdiodev->bus, mdiodev->addr, reg, value); 187 } 188 189 static int bcm_ns_usb3_mdio_probe(struct mdio_device *mdiodev) 190 { 191 struct device *dev = &mdiodev->dev; 192 const struct of_device_id *of_id; 193 struct phy_provider *phy_provider; 194 struct device_node *syscon_np; 195 struct bcm_ns_usb3 *usb3; 196 struct resource res; 197 int err; 198 199 usb3 = devm_kzalloc(dev, sizeof(*usb3), GFP_KERNEL); 200 if (!usb3) 201 return -ENOMEM; 202 203 usb3->dev = dev; 204 usb3->mdiodev = mdiodev; 205 206 of_id = of_match_device(bcm_ns_usb3_id_table, dev); 207 if (!of_id) 208 return -EINVAL; 209 usb3->family = (enum bcm_ns_family)of_id->data; 210 211 syscon_np = of_parse_phandle(dev->of_node, "usb3-dmp-syscon", 0); 212 err = of_address_to_resource(syscon_np, 0, &res); 213 of_node_put(syscon_np); 214 if (err) 215 return err; 216 217 usb3->dmp = devm_ioremap_resource(dev, &res); 218 if (IS_ERR(usb3->dmp)) { 219 dev_err(dev, "Failed to map DMP regs\n"); 220 return PTR_ERR(usb3->dmp); 221 } 222 223 usb3->phy = devm_phy_create(dev, NULL, &ops); 224 if (IS_ERR(usb3->phy)) { 225 dev_err(dev, "Failed to create PHY\n"); 226 return PTR_ERR(usb3->phy); 227 } 228 229 phy_set_drvdata(usb3->phy, usb3); 230 231 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); 232 233 return PTR_ERR_OR_ZERO(phy_provider); 234 } 235 236 static struct mdio_driver bcm_ns_usb3_mdio_driver = { 237 .mdiodrv = { 238 .driver = { 239 .name = "bcm_ns_mdio_usb3", 240 .of_match_table = bcm_ns_usb3_id_table, 241 }, 242 }, 243 .probe = bcm_ns_usb3_mdio_probe, 244 }; 245 246 mdio_module_driver(bcm_ns_usb3_mdio_driver); 247 248 MODULE_LICENSE("GPL v2"); 249 MODULE_DEVICE_TABLE(of, bcm_ns_usb3_id_table); 250