1 files changed, 274 insertions, 0 deletions
diff --git a/drivers/phy/phy-bcm-ns-usb3.c b/drivers/phy/phy-bcm-ns-usb3.c
new file mode 100644
index 000000000000..f420fa4bebfc
--- /dev/null
+++ b/drivers/phy/phy-bcm-ns-usb3.c
@@ -0,0 +1,274 @@
+/*
+ * Broadcom Northstar USB 3.0 PHY Driver
+ *
+ * Copyright (C) 2016 Rafał Miłecki <rafal@milecki.pl>
+ *
+ * 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 <linux/bcma/bcma.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/phy/phy.h>
+#include <linux/slab.h>
+
+#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");