bcm53xx: backport USB 3.0 Northstar PHY driver

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

1 files changed, 361 insertions, 0 deletions

diff --git a/target/linux/bcm53xx/patches-4.4/071-phy-bcm-ns-usb3-new-driver-for-USB-3.0-PHY-on-Norths.patch b/target/linux/bcm53xx/patches-4.4/071-phy-bcm-ns-usb3-new-driver-for-USB-3.0-PHY-on-Norths.patch
new file mode 100644
index 0000000000..ad34fc8484
--- /dev/null
+++ b/target/linux/bcm53xx/patches-4.4/071-phy-bcm-ns-usb3-new-driver-for-USB-3.0-PHY-on-Norths.patch
@@ -0,0 +1,361 @@
+From b8d7478ecfec51b3430f677da44e662d5ff12444 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Fri, 12 Aug 2016 00:28:03 +0200
+Subject: [PATCH] phy: bcm-ns-usb3: new driver for USB 3.0 PHY on Northstar
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Northstar is a family of SoCs used in home routers. They have USB 2.0
+and 3.0 controllers with PHYs that need to be properly initialized.
+This driver provides PHY init support in a generic way and can be bound
+with XHCI controller driver.
+
+There aren't any public datasheets from Broadcom so we can't have nice
+defines for all used bits. It means we just follow Broadcom's
+initialization procedure using their magic values. We were quite lucky
+actually that Broadcom put some comments in their SDK reference code
+explaining what given writes are responsible for.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
+---
+ .../devicetree/bindings/phy/bcm-ns-usb3-phy.txt    |  23 ++
+ drivers/phy/Kconfig                                |   9 +
+ drivers/phy/Makefile                               |   1 +
+ drivers/phy/phy-bcm-ns-usb3.c                      | 274 +++++++++++++++++++++
+ 4 files changed, 307 insertions(+)
+ create mode 100644 Documentation/devicetree/bindings/phy/bcm-ns-usb3-phy.txt
+ create mode 100644 drivers/phy/phy-bcm-ns-usb3.c
+
+--- /dev/null
++++ b/Documentation/devicetree/bindings/phy/bcm-ns-usb3-phy.txt
+@@ -0,0 +1,23 @@
++Driver for Broadcom Northstar USB 3.0 PHY
++
++Required properties:
++
++- compatible: one of: "brcm,ns-ax-usb3-phy", "brcm,ns-bx-usb3-phy".
++- reg: register mappings for DMP (Device Management Plugin) and ChipCommon B
++       MMI.
++- reg-names: "dmp" and "ccb-mii"
++
++Initialization of USB 3.0 PHY depends on Northstar version. There are currently
++three known series: Ax, Bx and Cx.
++Known A0: BCM4707 rev 0
++Known B0: BCM4707 rev 4, BCM53573 rev 2
++Known B1: BCM4707 rev 6
++Known C0: BCM47094 rev 0
++
++Example:
++	usb3-phy {
++		compatible = "brcm,ns-ax-usb3-phy";
++		reg = <0x18105000 0x1000>, <0x18003000 0x1000>;
++		reg-names = "dmp", "ccb-mii";
++		#phy-cells = <0>;
++	};
+--- a/drivers/phy/Kconfig
++++ b/drivers/phy/Kconfig
+@@ -24,6 +24,15 @@ config PHY_BCM_NS_USB2
+ 	  Enable this to support Broadcom USB 2.0 PHY connected to the USB
+ 	  controller on Northstar family.
+ 
++config PHY_BCM_NS_USB3
++	tristate "Broadcom Northstar USB 3.0 PHY Driver"
++	depends on ARCH_BCM_IPROC || COMPILE_TEST
++	depends on HAS_IOMEM && OF
++	select GENERIC_PHY
++	help
++	  Enable this to support Broadcom USB 3.0 PHY connected to the USB
++	  controller on Northstar family.
++
+ config PHY_BERLIN_USB
+ 	tristate "Marvell Berlin USB PHY Driver"
+ 	depends on ARCH_BERLIN && RESET_CONTROLLER && HAS_IOMEM && OF
+--- a/drivers/phy/Makefile
++++ b/drivers/phy/Makefile
+@@ -4,6 +4,7 @@
+ 
+ obj-$(CONFIG_GENERIC_PHY)		+= phy-core.o
+ obj-$(CONFIG_PHY_BCM_NS_USB2)		+= phy-bcm-ns-usb2.o
++obj-$(CONFIG_PHY_BCM_NS_USB3)		+= phy-bcm-ns-usb3.o
+ obj-$(CONFIG_PHY_BERLIN_USB)		+= phy-berlin-usb.o
+ obj-$(CONFIG_PHY_BERLIN_SATA)		+= phy-berlin-sata.o
+ obj-$(CONFIG_PHY_DM816X_USB)		+= phy-dm816x-usb.o
+--- /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");