/* * Broadcom Northstar USB 3.0 PHY Driver * * Copyright (C) 2016 Rafał Miłecki * * All magic values used for initialization (and related comments) were obtained * from Broadcom's SDK: * Copyright (c) Broadcom Corp, 2012 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #define BCM_NS_USB3_MII_MNG_TIMEOUT_US 1000 /* usecs */ enum bcm_ns_family { BCM_NS_UNKNOWN, BCM_NS_AX, BCM_NS_BX, }; struct bcm_ns_usb3 { struct device *dev; enum bcm_ns_family family; void __iomem *dmp; void __iomem *ccb_mii; struct phy *phy; }; static const struct of_device_id bcm_ns_usb3_id_table[] = { { .compatible = "brcm,ns-ax-usb3-phy", .data = (int *)BCM_NS_AX, }, { .compatible = "brcm,ns-bx-usb3-phy", .data = (int *)BCM_NS_BX, }, {}, }; MODULE_DEVICE_TABLE(of, bcm_ns_usb3_id_table); static int bcm_ns_usb3_wait_reg(struct bcm_ns_usb3 *usb3, void __iomem *addr, u32 mask, u32 value, unsigned long timeout) { unsigned long deadline = jiffies + timeout; u32 val; do { val = readl(addr); if ((val & mask) == value) return 0; cpu_relax(); udelay(10); } while (!time_after_eq(jiffies, deadline)); dev_err(usb3->dev, "Timeout waiting for register %p\n", addr); return -EBUSY; } static inline int bcm_ns_usb3_mii_mng_wait_idle(struct bcm_ns_usb3 *usb3) { return bcm_ns_usb3_wait_reg(usb3, usb3->ccb_mii + BCMA_CCB_MII_MNG_CTL, 0x0100, 0x0000, usecs_to_jiffies(BCM_NS_USB3_MII_MNG_TIMEOUT_US)); } static int bcm_ns_usb3_mii_mng_write32(struct bcm_ns_usb3 *usb3, u32 value) { int err; err = bcm_ns_usb3_mii_mng_wait_idle(usb3); if (err < 0) { dev_err(usb3->dev, "Couldn't write 0x%08x value\n", value); return err; } writel(value, usb3->ccb_mii + BCMA_CCB_MII_MNG_CMD_DATA); return 0; } static int bcm_ns_usb3_phy_init_ns_bx(struct bcm_ns_usb3 *usb3) { int err; /* Enable MDIO. Setting MDCDIV as 26 */ writel(0x0000009a, usb3->ccb_mii + BCMA_CCB_MII_MNG_CTL); /* Wait for MDIO? */ udelay(2); /* USB3 PLL Block */ err = bcm_ns_usb3_mii_mng_write32(usb3, 0x587e8000); if (err < 0) return err; /* Assert Ana_Pllseq start */ bcm_ns_usb3_mii_mng_write32(usb3, 0x58061000); /* Assert CML Divider ratio to 26 */ bcm_ns_usb3_mii_mng_write32(usb3, 0x582a6400); /* Asserting PLL Reset */ bcm_ns_usb3_mii_mng_write32(usb3, 0x582ec000); /* Deaaserting PLL Reset */ bcm_ns_usb3_mii_mng_write32(usb3, 0x582e8000); /* Waiting MII Mgt interface idle */ bcm_ns_usb3_mii_mng_wait_idle(usb3); /* Deasserting USB3 system reset */ writel(0, usb3->dmp + BCMA_RESET_CTL); /* PLL frequency monitor enable */ bcm_ns_usb3_mii_mng_write32(usb3, 0x58069000); /* PIPE Block */ bcm_ns_usb3_mii_mng_write32(usb3, 0x587e8060); /* CMPMAX & CMPMINTH setting */ bcm_ns_usb3_mii_mng_write32(usb3, 0x580af30d); /* DEGLITCH MIN & MAX setting */ bcm_ns_usb3_mii_mng_write32(usb3, 0x580e6302); /* TXPMD block */ bcm_ns_usb3_mii_mng_write32(usb3, 0x587e8040); /* Enabling SSC */ bcm_ns_usb3_mii_mng_write32(usb3, 0x58061003); /* Waiting MII Mgt interface idle */ bcm_ns_usb3_mii_mng_wait_idle(usb3); return 0; } static int bcm_ns_usb3_phy_init_ns_ax(struct bcm_ns_usb3 *usb3) { int err; /* Enable MDIO. Setting MDCDIV as 26 */ writel(0x0000009a, usb3->ccb_mii + BCMA_CCB_MII_MNG_CTL); /* Wait for MDIO? */ udelay(2); /* PLL30 block */ err = bcm_ns_usb3_mii_mng_write32(usb3, 0x587e8000); if (err < 0) return err; bcm_ns_usb3_mii_mng_write32(usb3, 0x582a6400); bcm_ns_usb3_mii_mng_write32(usb3, 0x587e80e0); bcm_ns_usb3_mii_mng_write32(usb3, 0x580a009c); /* Enable SSC */ bcm_ns_usb3_mii_mng_write32(usb3, 0x587e8040); bcm_ns_usb3_mii_mng_write32(usb3, 0x580a21d3); bcm_ns_usb3_mii_mng_write32(usb3, 0x58061003); /* Waiting MII Mgt interface idle */ bcm_ns_usb3_mii_mng_wait_idle(usb3); /* Deasserting USB3 system reset */ writel(0, usb3->dmp + BCMA_RESET_CTL); return 0; } static int bcm_ns_usb3_phy_init(struct phy *phy) { struct bcm_ns_usb3 *usb3 = phy_get_drvdata(phy); int err; /* Perform USB3 system soft reset */ writel(BCMA_RESET_CTL_RESET, usb3->dmp + BCMA_RESET_CTL); switch (usb3->family) { case BCM_NS_AX: err = bcm_ns_usb3_phy_init_ns_ax(usb3); break; case BCM_NS_BX: err = bcm_ns_usb3_phy_init_ns_bx(usb3); break; default: WARN_ON(1); err = -ENOTSUPP; } return err; } static const struct phy_ops ops = { .init = bcm_ns_usb3_phy_init, .owner = THIS_MODULE, }; static int bcm_ns_usb3_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; const struct of_device_id *of_id; struct bcm_ns_usb3 *usb3; struct resource *res; struct phy_provider *phy_provider; usb3 = devm_kzalloc(dev, sizeof(*usb3), GFP_KERNEL); if (!usb3) return -ENOMEM; usb3->dev = dev; of_id = of_match_device(bcm_ns_usb3_id_table, dev); if (!of_id) return -EINVAL; usb3->family = (enum bcm_ns_family)of_id->data; res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dmp"); usb3->dmp = devm_ioremap_resource(dev, res); if (IS_ERR(usb3->dmp)) { dev_err(dev, "Failed to map DMP regs\n"); return PTR_ERR(usb3->dmp); } res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ccb-mii"); usb3->ccb_mii = devm_ioremap_resource(dev, res); if (IS_ERR(usb3->ccb_mii)) { dev_err(dev, "Failed to map ChipCommon B MII regs\n"); return PTR_ERR(usb3->ccb_mii); } usb3->phy = devm_phy_create(dev, NULL, &ops); if (IS_ERR(usb3->phy)) { dev_err(dev, "Failed to create PHY\n"); return PTR_ERR(usb3->phy); } phy_set_drvdata(usb3->phy, usb3); platform_set_drvdata(pdev, usb3); phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); if (!IS_ERR(phy_provider)) dev_info(dev, "Registered Broadcom Northstar USB 3.0 PHY driver\n"); return PTR_ERR_OR_ZERO(phy_provider); } static struct platform_driver bcm_ns_usb3_driver = { .probe = bcm_ns_usb3_probe, .driver = { .name = "bcm_ns_usb3", .of_match_table = bcm_ns_usb3_id_table, }, }; module_platform_driver(bcm_ns_usb3_driver); MODULE_LICENSE("GPL v2");