Add Keystone platform specific glue layer to support
USB3 Host mode.
Cc: Santosh Shilimkar <santosh.shilim...@ti.com>
Cc: Felipe Balbi <ba...@ti.com>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Signed-off-by: WingMan Kwok <w-kw...@ti.com>
---
drivers/usb/dwc3/Kconfig | 7 +
drivers/usb/dwc3/Makefile | 1 +
drivers/usb/dwc3/dwc3-keystone.c | 272 ++++++++++++++++++++++++++++++++++++++
3 files changed, 280 insertions(+)
create mode 100644 drivers/usb/dwc3/dwc3-keystone.c
diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
index 70fc430..e2c730f 100644
--- a/drivers/usb/dwc3/Kconfig
+++ b/drivers/usb/dwc3/Kconfig
@@ -70,6 +70,13 @@ config USB_DWC3_PCI
One such PCIe-based platform is Synopsys' PCIe HAPS model of
this IP.
+config USB_DWC3_KEYSTONE
+ tristate "Texas Instruments Keystone2 Platforms"
+ default USB_DWC3
+ help
+ Support of USB2/3 functionality in TI Keystone2 platforms.
+ Say 'Y' or 'M' here if you have one such device
+
comment "Debugging features"
config USB_DWC3_DEBUG
diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
index dd17601..10ac3e7 100644
--- a/drivers/usb/dwc3/Makefile
+++ b/drivers/usb/dwc3/Makefile
@@ -32,3 +32,4 @@ endif
obj-$(CONFIG_USB_DWC3_OMAP) += dwc3-omap.o
obj-$(CONFIG_USB_DWC3_EXYNOS) += dwc3-exynos.o
obj-$(CONFIG_USB_DWC3_PCI) += dwc3-pci.o
+obj-$(CONFIG_USB_DWC3_KEYSTONE) += dwc3-keystone.o
diff --git a/drivers/usb/dwc3/dwc3-keystone.c b/drivers/usb/dwc3/dwc3-keystone.c
new file mode 100644
index 0000000..a4c9cbc
--- /dev/null
+++ b/drivers/usb/dwc3/dwc3-keystone.c
@@ -0,0 +1,272 @@
+/**
+ * dwc3-keystone.c - Keystone Specific Glue layer
+ *
+ * Copyright (C) 2010-2013 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Authors: WingMan Kwok <w-kw...@ti.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 of
+ * the License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/usb/usb_phy_gen_xceiv.h>
+
+
+#define BITS(n) (BIT(n) - 1)
+#define BITFIELD(x, s, n) (((x) & BITS(n)) << (s))
+#define MASK 0xffffffff
+#define PHY_REF_SSP_EN(x) BITFIELD(x, 29, 1)
+
+static u64 kdwc3_dma_mask;
+
+struct kdwc3_phy_ctrl_regs {
+ u32 phy_utmi;
+ u32 phy_pipe;
+ u32 phy_param_ctrl_1;
+ u32 phy_param_ctrl_2;
+ u32 phy_clock;
+ u32 phy_pll;
+};
+
+struct kdwc3_irq_regs {
+ u32 revision;
+ u32 _rsvd0[3];
+ u32 sysconfig;
+ u32 _rsvd1[1];
+ u32 irq_eoi;
+ u32 _rsvd2[1];
+ struct {
+ u32 raw_status;
+ u32 status;
+ u32 enable_set;
+ u32 enable_clr;
+ } irqs[16];
+};
+
+struct dwc3_keystone {
+ spinlock_t lock;
+ struct device *dev;
+ struct clk *clk;
+ int irqn;
+
+ struct kdwc3_phy_ctrl_regs __iomem *phy_ctrl;
+ struct kdwc3_irq_regs __iomem *usbss;
+};
+
+static void kdwc3_enable_irqs(struct dwc3_keystone *kdwc)
+{
+ writel(1, &kdwc->usbss->irqs[kdwc->irqn].enable_set);
+}
+
+static void kdwc3_disable_irqs(struct dwc3_keystone *kdwc)
+{
+ writel(0, &kdwc->usbss->irqs[kdwc->irqn].enable_set);
+}
+
+static int kdwc3_enable(struct dwc3_keystone *kdwc)
+{
+ int error;
+ u32 val;
+
+ kdwc->clk = devm_clk_get(kdwc->dev, "usb");
+ if (IS_ERR_OR_NULL(kdwc->clk)) {
+ dev_err(kdwc->dev, "unable to get kdwc usb clock\n");
+ return -ENODEV;
+ }
+
+ val = readl(&kdwc->phy_ctrl->phy_clock);
+ writel(val | PHY_REF_SSP_EN(1), &kdwc->phy_ctrl->phy_clock);
+ udelay(20);
+
+ error = clk_prepare_enable(kdwc->clk);
+ if (error < 0) {
+ dev_dbg(kdwc->dev, "unable to enable usb clock, err %d\n",
+ error);
+ writel(val, &kdwc->phy_ctrl->phy_clock);
+ return error;
+ }
+
+ /* soft reset usbss */
+ writel(1, &kdwc->usbss->sysconfig);
+ while (readl(&kdwc->usbss->sysconfig) & 1)
+ ;
+
+ val = readl(&kdwc->usbss->revision);
+ dev_info(kdwc->dev, "usbss revision %x\n", val);
+
+ return 0;
+}
+
+static void kdwc3_disable(struct dwc3_keystone *kdwc)
+{
+ u32 val;
+
+ clk_disable_unprepare(kdwc->clk);
+
+ val = readl(&kdwc->phy_ctrl->phy_clock);
+ val &= ~PHY_REF_SSP_EN(MASK);
+ writel(val, &kdwc->phy_ctrl->phy_clock);
+}
+
+static irqreturn_t dwc3_keystone_interrupt(int irq, void *_kdwc)
+{
+ struct dwc3_keystone *kdwc = _kdwc;
+ int irqn = kdwc->irqn;
+
+ spin_lock(&kdwc->lock);
+ writel(1, &kdwc->usbss->irqs[irqn].enable_clr);
+ writel(1, &kdwc->usbss->irqs[irqn].status);
+ writel(1, &kdwc->usbss->irqs[irqn].enable_set);
+ writel(BIT(irqn), &kdwc->usbss->irq_eoi);
+ spin_unlock(&kdwc->lock);
+
+ return IRQ_HANDLED;
+}
+
+static int kdwc3_probe(struct platform_device *pdev)
+{
+ struct device_node *node = pdev->dev.of_node;
+ struct device *dev = &pdev->dev;
+ struct dwc3_keystone *kdwc;
+ struct resource *res;
+ int error, irq;
+
+ if (!node) {
+ dev_err(dev, "device node not found\n");
+ return -EINVAL;
+ }
+
+ kdwc = devm_kzalloc(dev, sizeof(*kdwc), GFP_KERNEL);
+ if (!kdwc)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, kdwc);
+
+ spin_lock_init(&kdwc->lock);
+ kdwc->dev = dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev, "missing usbss resource\n");
+ return -EINVAL;
+ }
+
+ kdwc->usbss = devm_ioremap_resource(dev, res);
+ if (IS_ERR(kdwc->usbss)) {
+ dev_err(dev, "ioremap failed on usbss region\n");
+ return PTR_ERR(kdwc->usbss);
+ }
+
+ dev_dbg(dev, "usbss control start=%08x size=%d mapped=%08x\n",
+ (u32)(res->start), (int)resource_size(res),
+ (u32)(kdwc->usbss));
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!res) {
+ dev_err(dev, "missing usb phy resource\n");
+ return -EINVAL;
+ }
+
+ kdwc->phy_ctrl = devm_ioremap_resource(dev, res);
+ if (IS_ERR(kdwc->phy_ctrl)) {
+ dev_err(dev, "ioremap failed on usb phy region\n");
+ return PTR_ERR(kdwc->phy_ctrl);
+ }
+
+ dev_dbg(dev, "phy control start=%08x size=%d mapped=%08x\n",
+ (u32)(res->start), (int)resource_size(res),
+ (u32)(kdwc->phy_ctrl));
+
+ kdwc3_dma_mask = dma_get_mask(dev);
+ dev->dma_mask = &kdwc3_dma_mask;
+
+ error = kdwc3_enable(kdwc);
+ if (error)
+ return error;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(&pdev->dev, "missing irq\n");
+ goto err_irq;
+ }
+
+ error = devm_request_irq(dev, irq, dwc3_keystone_interrupt, IRQF_SHARED,
+ "keystone-dwc3", kdwc);
+ if (error) {
+ dev_err(dev, "failed to request IRQ #%d --> %d\n",
+ irq, error);
+ goto err_irq;
+ }
+
+ kdwc->irqn = 0;
+
+ kdwc3_enable_irqs(kdwc);
+
+ error = of_platform_populate(node, NULL, NULL, dev);
+ if (error) {
+ dev_err(&pdev->dev, "failed to create dwc3 core\n");
+ goto err_core;
+ }
+
+ return 0;
+
+err_core:
+ kdwc3_disable_irqs(kdwc);
+err_irq:
+ kdwc3_disable(kdwc);
+
+ return error;
+}
+
+static int kdwc3_remove(struct platform_device *pdev)
+{
+ struct dwc3_keystone *kdwc = platform_get_drvdata(pdev);
+
+ if (kdwc) {
+ kdwc3_disable_irqs(kdwc);
+ kdwc3_disable(kdwc);
+ platform_set_drvdata(pdev, NULL);
+ }
+ return 0;
+}
+
+static const struct of_device_id kdwc3_of_match[] = {
+ { .compatible = "ti,keystone-dwc3", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, kdwc3_of_match);
+
+static struct platform_driver kdwc3_driver = {
+ .probe = kdwc3_probe,
+ .remove = kdwc3_remove,
+ .driver = {
+ .name = "keystone-dwc3",
+ .owner = THIS_MODULE,
+ .of_match_table = kdwc3_of_match,
+ },
+};
+
+module_platform_driver(kdwc3_driver);
+
+MODULE_ALIAS("platform:keystone-dwc3");
+MODULE_AUTHOR("WingMan Kwok <w-kw...@ti.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("DesignWare USB3 KEYSTONE Glue Layer");
--
1.7.9.5
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