252 lines
8 KiB
Diff
252 lines
8 KiB
Diff
From d3feb406733544dbf0e239ef945a09decdceac88 Mon Sep 17 00:00:00 2001
|
|
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
|
|
Date: Thu, 14 Apr 2016 11:37:43 +0200
|
|
Subject: [PATCH] phy: bcm-ns-usb2: new driver for USB 2.0 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 an EHCI controller driver.
|
|
There are (just a few) registers being defined in bcma header. It's
|
|
because DMU/CRU registers will be also needed in other drivers. We will
|
|
need them e.g. in PCIe controller/PHY driver and at some point probably
|
|
in clock driver for BCM53573 chipset. By using include/linux/bcma/ we
|
|
avoid code duplication.
|
|
|
|
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
|
|
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
|
|
---
|
|
.../devicetree/bindings/phy/bcm-ns-usb2-phy.txt | 21 ++++
|
|
drivers/phy/Kconfig | 9 ++
|
|
drivers/phy/Makefile | 1 +
|
|
drivers/phy/phy-bcm-ns-usb2.c | 137 +++++++++++++++++++++
|
|
include/linux/bcma/bcma.h | 1 +
|
|
include/linux/bcma/bcma_driver_arm_c9.h | 15 +++
|
|
6 files changed, 184 insertions(+)
|
|
create mode 100644 Documentation/devicetree/bindings/phy/bcm-ns-usb2-phy.txt
|
|
create mode 100644 drivers/phy/phy-bcm-ns-usb2.c
|
|
create mode 100644 include/linux/bcma/bcma_driver_arm_c9.h
|
|
|
|
--- /dev/null
|
|
+++ b/Documentation/devicetree/bindings/phy/bcm-ns-usb2-phy.txt
|
|
@@ -0,0 +1,21 @@
|
|
+Driver for Broadcom Northstar USB 2.0 PHY
|
|
+
|
|
+Required properties:
|
|
+- compatible: brcm,ns-usb2-phy
|
|
+- reg: iomem address range of DMU (Device Management Unit)
|
|
+- reg-names: "dmu", the only needed & supported reg right now
|
|
+- clocks: USB PHY reference clock
|
|
+- clock-names: "phy-ref-clk", the only needed & supported clock right now
|
|
+
|
|
+To initialize USB 2.0 PHY driver needs to setup PLL correctly. To do this it
|
|
+requires passing phandle to the USB PHY reference clock.
|
|
+
|
|
+Example:
|
|
+ usb2-phy {
|
|
+ compatible = "brcm,ns-usb2-phy";
|
|
+ reg = <0x1800c000 0x1000>;
|
|
+ reg-names = "dmu";
|
|
+ #phy-cells = <0>;
|
|
+ clocks = <&genpll BCM_NSP_GENPLL_USB_PHY_REF_CLK>;
|
|
+ clock-names = "phy-ref-clk";
|
|
+ };
|
|
--- a/drivers/phy/Kconfig
|
|
+++ b/drivers/phy/Kconfig
|
|
@@ -15,6 +15,15 @@ config GENERIC_PHY
|
|
phy users can obtain reference to the PHY. All the users of this
|
|
framework should select this config.
|
|
|
|
+config PHY_BCM_NS_USB2
|
|
+ tristate "Broadcom Northstar USB 2.0 PHY Driver"
|
|
+ depends on ARCH_BCM_IPROC || COMPILE_TEST
|
|
+ depends on HAS_IOMEM && OF
|
|
+ select GENERIC_PHY
|
|
+ help
|
|
+ Enable this to support Broadcom USB 2.0 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
|
|
@@ -3,6 +3,7 @@
|
|
#
|
|
|
|
obj-$(CONFIG_GENERIC_PHY) += phy-core.o
|
|
+obj-$(CONFIG_PHY_BCM_NS_USB2) += phy-bcm-ns-usb2.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-usb2.c
|
|
@@ -0,0 +1,137 @@
|
|
+/*
|
|
+ * Broadcom Northstar USB 2.0 PHY Driver
|
|
+ *
|
|
+ * Copyright (C) 2016 Rafał Miłecki <zajec5@gmail.com>
|
|
+ *
|
|
+ * 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/clk.h>
|
|
+#include <linux/delay.h>
|
|
+#include <linux/err.h>
|
|
+#include <linux/module.h>
|
|
+#include <linux/of_address.h>
|
|
+#include <linux/of_platform.h>
|
|
+#include <linux/phy/phy.h>
|
|
+#include <linux/platform_device.h>
|
|
+#include <linux/slab.h>
|
|
+
|
|
+struct bcm_ns_usb2 {
|
|
+ struct device *dev;
|
|
+ struct clk *ref_clk;
|
|
+ struct phy *phy;
|
|
+ void __iomem *dmu;
|
|
+};
|
|
+
|
|
+static int bcm_ns_usb2_phy_init(struct phy *phy)
|
|
+{
|
|
+ struct bcm_ns_usb2 *usb2 = phy_get_drvdata(phy);
|
|
+ struct device *dev = usb2->dev;
|
|
+ void __iomem *dmu = usb2->dmu;
|
|
+ u32 ref_clk_rate, usb2ctl, usb_pll_ndiv, usb_pll_pdiv;
|
|
+ int err = 0;
|
|
+
|
|
+ err = clk_prepare_enable(usb2->ref_clk);
|
|
+ if (err < 0) {
|
|
+ dev_err(dev, "Failed to prepare ref clock: %d\n", err);
|
|
+ goto err_out;
|
|
+ }
|
|
+
|
|
+ ref_clk_rate = clk_get_rate(usb2->ref_clk);
|
|
+ if (!ref_clk_rate) {
|
|
+ dev_err(dev, "Failed to get ref clock rate\n");
|
|
+ err = -EINVAL;
|
|
+ goto err_clk_off;
|
|
+ }
|
|
+
|
|
+ usb2ctl = readl(dmu + BCMA_DMU_CRU_USB2_CONTROL);
|
|
+
|
|
+ if (usb2ctl & BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_PDIV_MASK) {
|
|
+ usb_pll_pdiv = usb2ctl;
|
|
+ usb_pll_pdiv &= BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_PDIV_MASK;
|
|
+ usb_pll_pdiv >>= BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_PDIV_SHIFT;
|
|
+ } else {
|
|
+ usb_pll_pdiv = 1 << 3;
|
|
+ }
|
|
+
|
|
+ /* Calculate ndiv based on a solid 1920 MHz that is for USB2 PHY */
|
|
+ usb_pll_ndiv = (1920000000 * usb_pll_pdiv) / ref_clk_rate;
|
|
+
|
|
+ /* Unlock DMU PLL settings with some magic value */
|
|
+ writel(0x0000ea68, dmu + BCMA_DMU_CRU_CLKSET_KEY);
|
|
+
|
|
+ /* Write USB 2.0 PLL control setting */
|
|
+ usb2ctl &= ~BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_NDIV_MASK;
|
|
+ usb2ctl |= usb_pll_ndiv << BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_NDIV_SHIFT;
|
|
+ writel(usb2ctl, dmu + BCMA_DMU_CRU_USB2_CONTROL);
|
|
+
|
|
+ /* Lock DMU PLL settings */
|
|
+ writel(0x00000000, dmu + BCMA_DMU_CRU_CLKSET_KEY);
|
|
+
|
|
+err_clk_off:
|
|
+ clk_disable_unprepare(usb2->ref_clk);
|
|
+err_out:
|
|
+ return err;
|
|
+}
|
|
+
|
|
+static const struct phy_ops ops = {
|
|
+ .init = bcm_ns_usb2_phy_init,
|
|
+ .owner = THIS_MODULE,
|
|
+};
|
|
+
|
|
+static int bcm_ns_usb2_probe(struct platform_device *pdev)
|
|
+{
|
|
+ struct device *dev = &pdev->dev;
|
|
+ struct bcm_ns_usb2 *usb2;
|
|
+ struct resource *res;
|
|
+ struct phy_provider *phy_provider;
|
|
+
|
|
+ usb2 = devm_kzalloc(&pdev->dev, sizeof(*usb2), GFP_KERNEL);
|
|
+ if (!usb2)
|
|
+ return -ENOMEM;
|
|
+ usb2->dev = dev;
|
|
+
|
|
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dmu");
|
|
+ usb2->dmu = devm_ioremap_resource(dev, res);
|
|
+ if (IS_ERR(usb2->dmu)) {
|
|
+ dev_err(dev, "Failed to map DMU regs\n");
|
|
+ return PTR_ERR(usb2->dmu);
|
|
+ }
|
|
+
|
|
+ usb2->ref_clk = devm_clk_get(dev, "phy-ref-clk");
|
|
+ if (IS_ERR(usb2->ref_clk)) {
|
|
+ dev_err(dev, "Clock not defined\n");
|
|
+ return PTR_ERR(usb2->ref_clk);
|
|
+ }
|
|
+
|
|
+ usb2->phy = devm_phy_create(dev, NULL, &ops);
|
|
+ if (IS_ERR(dev))
|
|
+ return PTR_ERR(dev);
|
|
+
|
|
+ phy_set_drvdata(usb2->phy, usb2);
|
|
+ platform_set_drvdata(pdev, usb2);
|
|
+
|
|
+ phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
|
|
+ return PTR_ERR_OR_ZERO(phy_provider);
|
|
+}
|
|
+
|
|
+static const struct of_device_id bcm_ns_usb2_id_table[] = {
|
|
+ { .compatible = "brcm,ns-usb2-phy", },
|
|
+ {},
|
|
+};
|
|
+MODULE_DEVICE_TABLE(of, bcm_ns_usb2_id_table);
|
|
+
|
|
+static struct platform_driver bcm_ns_usb2_driver = {
|
|
+ .probe = bcm_ns_usb2_probe,
|
|
+ .driver = {
|
|
+ .name = "bcm_ns_usb2",
|
|
+ .of_match_table = bcm_ns_usb2_id_table,
|
|
+ },
|
|
+};
|
|
+module_platform_driver(bcm_ns_usb2_driver);
|
|
+
|
|
+MODULE_LICENSE("GPL v2");
|
|
--- a/include/linux/bcma/bcma.h
|
|
+++ b/include/linux/bcma/bcma.h
|
|
@@ -4,6 +4,7 @@
|
|
#include <linux/pci.h>
|
|
#include <linux/mod_devicetable.h>
|
|
|
|
+#include <linux/bcma/bcma_driver_arm_c9.h>
|
|
#include <linux/bcma/bcma_driver_chipcommon.h>
|
|
#include <linux/bcma/bcma_driver_pci.h>
|
|
#include <linux/bcma/bcma_driver_pcie2.h>
|
|
--- /dev/null
|
|
+++ b/include/linux/bcma/bcma_driver_arm_c9.h
|
|
@@ -0,0 +1,15 @@
|
|
+#ifndef LINUX_BCMA_DRIVER_ARM_C9_H_
|
|
+#define LINUX_BCMA_DRIVER_ARM_C9_H_
|
|
+
|
|
+/* DMU (Device Management Unit) */
|
|
+#define BCMA_DMU_CRU_USB2_CONTROL 0x0164
|
|
+#define BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_NDIV_MASK 0x00000FFC
|
|
+#define BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_NDIV_SHIFT 2
|
|
+#define BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_PDIV_MASK 0x00007000
|
|
+#define BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_PDIV_SHIFT 12
|
|
+#define BCMA_DMU_CRU_CLKSET_KEY 0x0180
|
|
+#define BCMA_DMU_CRU_STRAPS_CTRL 0x02A0
|
|
+#define BCMA_DMU_CRU_STRAPS_CTRL_USB3 0x00000010
|
|
+#define BCMA_DMU_CRU_STRAPS_CTRL_4BYTE 0x00008000
|
|
+
|
|
+#endif /* LINUX_BCMA_DRIVER_ARM_C9_H_ */
|