--- /dev/null
+/*
+ * Copyright (C) 2007-2013 Texas Instruments, Inc.
+ * Author: Vikram Pandita <vikram.pandita@ti.com>
+ * Author: Anand Gadiyar <gadiyar@ti.com>
+ * Author: Keshava Munegowda <keshava_mgowda@ti.com>
+ * Author: Roger Quadros <rogerq@ti.com>
+ *
+ * Copyright (C) 2009 Nokia Corporation
+ * Contact: Felipe Balbi <felipe.balbi@nokia.com>
+ *
+ * Based on ehci-omap.c - driver for USBHOST on OMAP3/4 processors
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive
+ * for more details.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/usb/ulpi.h>
+#include <linux/pm_runtime.h>
+#include <linux/gpio.h>
+#include <linux/clk.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include <linux/of.h>
+#include <linux/dma-mapping.h>
+
+#include "ehci.h"
+
+#define H20AHB_HS_USB_PORTS 1
+
+/* EHCI Synopsys-specific Register Set */
+#define EHCI_INSNREG04 (0xA0)
+#define EHCI_INSNREG04_DISABLE_UNSUSPEND (1 << 5)
+#define EHCI_INSNREG05_ULPI (0xA4)
+#define EHCI_INSNREG05_ULPI_CONTROL_SHIFT 31
+#define EHCI_INSNREG05_ULPI_PORTSEL_SHIFT 24
+#define EHCI_INSNREG05_ULPI_OPSEL_SHIFT 22
+#define EHCI_INSNREG05_ULPI_REGADD_SHIFT 16
+#define EHCI_INSNREG05_ULPI_EXTREGADD_SHIFT 8
+#define EHCI_INSNREG05_ULPI_WRDATA_SHIFT 0
+
+#define DRIVER_DESC "H20AHB-EHCI Host Controller driver"
+
+static const char hcd_name[] = "ehci-h20ahb";
+
+/*-------------------------------------------------------------------------*/
+
+struct h20ahb_hcd {
+ struct usb_phy *phy[H20AHB_HS_USB_PORTS]; /* one PHY for each port */
+ int nports;
+};
+
+static inline void ehci_write(void __iomem *base, u32 reg, u32 val)
+{
+ __raw_writel(val, base + reg);
+}
+
+static inline u32 ehci_read(void __iomem *base, u32 reg)
+{
+ return __raw_readl(base + reg);
+}
+
+/* configure so an HC device and id are always provided */
+/* always called with process context; sleeping is OK */
+
+static struct hc_driver __read_mostly ehci_h20ahb_hc_driver;
+
+static const struct ehci_driver_overrides ehci_h20ahb_overrides __initdata = {
+ .extra_priv_size = sizeof(struct h20ahb_hcd),
+};
+
+static int ehci_h20ahb_phy_read(struct usb_phy *x, u32 reg)
+{
+ u32 val = (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT) |
+ (1 << EHCI_INSNREG05_ULPI_PORTSEL_SHIFT) |
+ (3 << EHCI_INSNREG05_ULPI_OPSEL_SHIFT) |
+ (reg << EHCI_INSNREG05_ULPI_REGADD_SHIFT);
+ ehci_write(x->io_priv, 0, val);
+ while ((val = ehci_read(x->io_priv, 0)) &
+ (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT));
+ return val & 0xff;
+}
+
+static int ehci_h20ahb_phy_write(struct usb_phy *x, u32 val, u32 reg)
+{
+ u32 v = (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT) |
+ (1 << EHCI_INSNREG05_ULPI_PORTSEL_SHIFT) |
+ (2 << EHCI_INSNREG05_ULPI_OPSEL_SHIFT) |
+ (reg << EHCI_INSNREG05_ULPI_REGADD_SHIFT) |
+ (val & 0xff);
+ ehci_write(x->io_priv, 0, v);
+ while ((v = ehci_read(x->io_priv, 0)) &
+ (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT));
+ return 0;
+}
+
+static struct usb_phy_io_ops ehci_h20ahb_phy_io_ops = {
+ .read = ehci_h20ahb_phy_read,
+ .write = ehci_h20ahb_phy_write,
+};
+
+
+/**
+ * ehci_hcd_h20ahb_probe - initialize Synopsis-based HCDs
+ *
+ * Allocates basic resources for this USB host controller, and
+ * then invokes the start() method for the HCD associated with it
+ * through the hotplug entry's driver_data.
+ */
+static int ehci_hcd_h20ahb_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ struct usb_hcd *hcd;
+ void __iomem *regs;
+ int ret;
+ int irq;
+ int i;
+ struct h20ahb_hcd *h20ahb;
+
+ if (usb_disabled())
+ return -ENODEV;
+
+ /* if (!dev->parent) {
+ dev_err(dev, "Missing parent device\n");
+ return -ENODEV;
+ }*/
+
+ /* For DT boot, get platform data from parent. i.e. usbhshost */
+ /*if (dev->of_node) {
+ pdata = dev_get_platdata(dev->parent);
+ dev->platform_data = pdata;
+ }
+
+ if (!pdata) {
+ dev_err(dev, "Missing platform data\n");
+ return -ENODEV;
+ }*/
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(dev, "EHCI irq failed\n");
+ return -ENODEV;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ regs = devm_ioremap_resource(dev, res);
+ if (IS_ERR(regs))
+ return PTR_ERR(regs);
+
+ /*
+ * Right now device-tree probed devices don't get dma_mask set.
+ * Since shared usb code relies on it, set it here for now.
+ * Once we have dma capability bindings this can go away.
+ */
+ ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
+ if (ret)
+ return ret;
+
+ ret = -ENODEV;
+ hcd = usb_create_hcd(&ehci_h20ahb_hc_driver, dev,
+ dev_name(dev));
+ if (!hcd) {
+ dev_err(dev, "Failed to create HCD\n");
+ return -ENOMEM;
+ }
+
+ hcd->rsrc_start = res->start;
+ hcd->rsrc_len = resource_size(res);
+ hcd->regs = regs;
+ hcd_to_ehci(hcd)->caps = regs;
+
+ h20ahb = (struct h20ahb_hcd *)hcd_to_ehci(hcd)->priv;
+ h20ahb->nports = 1;
+
+ platform_set_drvdata(pdev, hcd);
+
+ /* get the PHY devices if needed */
+ for (i = 0 ; i < h20ahb->nports ; i++) {
+ struct usb_phy *phy;
+
+ /* get the PHY device */
+#if 0
+ if (dev->of_node)
+ phy = devm_usb_get_phy_by_phandle(dev, "phys", i);
+ else
+ phy = devm_usb_get_phy_dev(dev, i);
+#endif
+ phy = otg_ulpi_create(&ehci_h20ahb_phy_io_ops, 0);
+ if (IS_ERR(phy)) {
+ ret = PTR_ERR(phy);
+ dev_err(dev, "Can't get PHY device for port %d: %d\n",
+ i, ret);
+ goto err_phy;
+ }
+ phy->dev = dev;
+ usb_add_phy_dev(phy);
+
+ h20ahb->phy[i] = phy;
+ phy->io_priv = hcd->regs + EHCI_INSNREG05_ULPI;
+
+#if 0
+ usb_phy_init(h20ahb->phy[i]);
+ /* bring PHY out of suspend */
+ usb_phy_set_suspend(h20ahb->phy[i], 0);
+#endif
+ }
+
+ /* make the first port's phy the one used by hcd as well */
+ hcd->phy = h20ahb->phy[0];
+
+ pm_runtime_enable(dev);
+ pm_runtime_get_sync(dev);
+
+ /*
+ * An undocumented "feature" in the H20AHB EHCI controller,
+ * causes suspended ports to be taken out of suspend when
+ * the USBCMD.Run/Stop bit is cleared (for example when
+ * we do ehci_bus_suspend).
+ * This breaks suspend-resume if the root-hub is allowed
+ * to suspend. Writing 1 to this undocumented register bit
+ * disables this feature and restores normal behavior.
+ */
+ ehci_write(regs, EHCI_INSNREG04,
+ EHCI_INSNREG04_DISABLE_UNSUSPEND);
+
+ ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
+ if (ret) {
+ dev_err(dev, "failed to add hcd with err %d\n", ret);
+ goto err_pm_runtime;
+ }
+ device_wakeup_enable(hcd->self.controller);
+
+ /*
+ * Bring PHYs out of reset for non PHY modes.
+ * Even though HSIC mode is a PHY-less mode, the reset
+ * line exists between the chips and can be modelled
+ * as a PHY device for reset control.
+ */
+ for (i = 0; i < h20ahb->nports; i++) {
+ usb_phy_init(h20ahb->phy[i]);
+ /* bring PHY out of suspend */
+ usb_phy_set_suspend(h20ahb->phy[i], 0);
+ }
+
+ return 0;
+
+err_pm_runtime:
+ pm_runtime_put_sync(dev);
+
+err_phy:
+ for (i = 0; i < h20ahb->nports; i++) {
+ if (h20ahb->phy[i])
+ usb_phy_shutdown(h20ahb->phy[i]);
+ }
+
+ usb_put_hcd(hcd);
+
+ return ret;
+}
+
+
+/**
+ * ehci_hcd_h20ahb_remove - shutdown processing for EHCI HCDs
+ * @pdev: USB Host Controller being removed
+ *
+ * Reverses the effect of usb_ehci_hcd_h20ahb_probe(), first invoking
+ * the HCD's stop() method. It is always called from a thread
+ * context, normally "rmmod", "apmd", or something similar.
+ */
+static int ehci_hcd_h20ahb_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+ struct h20ahb_hcd *h20ahb = (struct h20ahb_hcd *)hcd_to_ehci(hcd)->priv;
+ int i;
+
+ usb_remove_hcd(hcd);
+
+ for (i = 0; i < h20ahb->nports; i++) {
+ if (h20ahb->phy[i])
+ usb_phy_shutdown(h20ahb->phy[i]);
+ }
+
+ usb_put_hcd(hcd);
+ pm_runtime_put_sync(dev);
+ pm_runtime_disable(dev);
+
+ return 0;
+}
+
+static const struct of_device_id h20ahb_ehci_dt_ids[] = {
+ { .compatible = "snps,ehci-h20ahb" },
+ { }
+};
+
+MODULE_DEVICE_TABLE(of, h20ahb_ehci_dt_ids);
+
+static struct platform_driver ehci_hcd_h20ahb_driver = {
+ .probe = ehci_hcd_h20ahb_probe,
+ .remove = ehci_hcd_h20ahb_remove,
+ .shutdown = usb_hcd_platform_shutdown,
+ /*.suspend = ehci_hcd_h20ahb_suspend, */
+ /*.resume = ehci_hcd_h20ahb_resume, */
+ .driver = {
+ .name = hcd_name,
+ .of_match_table = h20ahb_ehci_dt_ids,
+ }
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int __init ehci_h20ahb_init(void)
+{
+ if (usb_disabled())
+ return -ENODEV;
+
+ pr_info("%s: " DRIVER_DESC "\n", hcd_name);
+
+ ehci_init_driver(&ehci_h20ahb_hc_driver, &ehci_h20ahb_overrides);
+ return platform_driver_register(&ehci_hcd_h20ahb_driver);
+}
+module_init(ehci_h20ahb_init);
+
+static void __exit ehci_h20ahb_cleanup(void)
+{
+ platform_driver_unregister(&ehci_hcd_h20ahb_driver);
+}
+module_exit(ehci_h20ahb_cleanup);
+
+MODULE_ALIAS("platform:ehci-h20ahb");
+MODULE_AUTHOR("Liviu Dudau <Liviu.Dudau@arm.com>");
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
projects / firefly-linux-kernel-4.4.55.git / commitdiff