/* * Copyright (C) 2007-2013 Texas Instruments, Inc. * Author: Vikram Pandita * Author: Anand Gadiyar * Author: Keshava Munegowda * Author: Roger Quadros * * Copyright (C) 2009 Nokia Corporation * Contact: Felipe Balbi * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #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) { writel_relaxed(val, base + reg); } static inline u32 ehci_read(void __iomem *base, u32 reg) { return readl_relaxed(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 "); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL");