/* * ehci-omap.c - driver for USBHOST on OMAP3/4 processors * * Bus Glue for the EHCI controllers in OMAP3/4 * Tested on several OMAP3 boards, and OMAP4 Pandaboard * * Copyright (C) 2007-2011 Texas Instruments, Inc. * Author: Vikram Pandita * Author: Anand Gadiyar * Author: Keshava Munegowda * * Copyright (C) 2009 Nokia Corporation * Contact: Felipe Balbi * * Based on "ehci-fsl.c" and "ehci-au1xxx.c" ehci glue layers * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * 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. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * TODO (last updated Feb 27, 2010): * - add kernel-doc * - enable AUTOIDLE * - add suspend/resume * - add HSIC and TLL support * - convert to use hwmod and runtime PM */ #include #include #include #include #include /* EHCI 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 /*-------------------------------------------------------------------------*/ static const struct hc_driver ehci_omap_hc_driver; 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); } static void omap_ehci_soft_phy_reset(struct platform_device *pdev, u8 port) { struct usb_hcd *hcd = dev_get_drvdata(&pdev->dev); unsigned long timeout = jiffies + msecs_to_jiffies(1000); unsigned reg = 0; reg = ULPI_FUNC_CTRL_RESET /* FUNCTION_CTRL_SET register */ | (ULPI_SET(ULPI_FUNC_CTRL) << EHCI_INSNREG05_ULPI_REGADD_SHIFT) /* Write */ | (2 << EHCI_INSNREG05_ULPI_OPSEL_SHIFT) /* PORTn */ | ((port + 1) << EHCI_INSNREG05_ULPI_PORTSEL_SHIFT) /* start ULPI access*/ | (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT); ehci_write(hcd->regs, EHCI_INSNREG05_ULPI, reg); /* Wait for ULPI access completion */ while ((ehci_read(hcd->regs, EHCI_INSNREG05_ULPI) & (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT))) { cpu_relax(); if (time_after(jiffies, timeout)) { dev_dbg(&pdev->dev, "phy reset operation timed out\n"); break; } } } static void disable_put_regulator( struct ehci_hcd_omap_platform_data *pdata) { int i; for (i = 0 ; i < OMAP3_HS_USB_PORTS ; i++) { if (pdata->regulator[i]) { regulator_disable(pdata->regulator[i]); regulator_put(pdata->regulator[i]); } } } /* configure so an HC device and id are always provided */ /* always called with process context; sleeping is OK */ /** * ehci_hcd_omap_probe - initialize TI-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_omap_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct ehci_hcd_omap_platform_data *pdata = dev->platform_data; struct resource *res; struct usb_hcd *hcd; void __iomem *regs; struct ehci_hcd *omap_ehci; int ret = -ENODEV; int irq; int i; char supply[7]; if (usb_disabled()) return -ENODEV; if (!dev->parent) { dev_err(dev, "Missing parent device\n"); return -ENODEV; } irq = platform_get_irq_byname(pdev, "ehci-irq"); if (irq < 0) { dev_err(dev, "EHCI irq failed\n"); return -ENODEV; } res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ehci"); if (!res) { dev_err(dev, "UHH EHCI get resource failed\n"); return -ENODEV; } regs = ioremap(res->start, resource_size(res)); if (!regs) { dev_err(dev, "UHH EHCI ioremap failed\n"); return -ENOMEM; } hcd = usb_create_hcd(&ehci_omap_hc_driver, dev, dev_name(dev)); if (!hcd) { dev_err(dev, "failed to create hcd with err %d\n", ret); ret = -ENOMEM; goto err_io; } hcd->rsrc_start = res->start; hcd->rsrc_len = resource_size(res); hcd->regs = regs; /* get ehci regulator and enable */ for (i = 0 ; i < OMAP3_HS_USB_PORTS ; i++) { if (pdata->port_mode[i] != OMAP_EHCI_PORT_MODE_PHY) { pdata->regulator[i] = NULL; continue; } snprintf(supply, sizeof(supply), "hsusb%d", i); pdata->regulator[i] = regulator_get(dev, supply); if (IS_ERR(pdata->regulator[i])) { pdata->regulator[i] = NULL; dev_dbg(dev, "failed to get ehci port%d regulator\n", i); } else { regulator_enable(pdata->regulator[i]); } } ret = omap_usbhs_enable(dev); if (ret) { dev_err(dev, "failed to start usbhs with err %d\n", ret); goto err_enable; } /* * An undocumented "feature" in the OMAP3 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); /* Soft reset the PHY using PHY reset command over ULPI */ if (pdata->port_mode[0] == OMAP_EHCI_PORT_MODE_PHY) omap_ehci_soft_phy_reset(pdev, 0); if (pdata->port_mode[1] == OMAP_EHCI_PORT_MODE_PHY) omap_ehci_soft_phy_reset(pdev, 1); omap_ehci = hcd_to_ehci(hcd); omap_ehci->sbrn = 0x20; /* we know this is the memory we want, no need to ioremap again */ omap_ehci->caps = hcd->regs; omap_ehci->regs = hcd->regs + HC_LENGTH(ehci, readl(&omap_ehci->caps->hc_capbase)); dbg_hcs_params(omap_ehci, "reset"); dbg_hcc_params(omap_ehci, "reset"); /* cache this readonly data; minimize chip reads */ omap_ehci->hcs_params = readl(&omap_ehci->caps->hcs_params); ret = usb_add_hcd(hcd, irq, IRQF_SHARED); if (ret) { dev_err(dev, "failed to add hcd with err %d\n", ret); goto err_add_hcd; } /* root ports should always stay powered */ ehci_port_power(omap_ehci, 1); return 0; err_add_hcd: omap_usbhs_disable(dev); err_enable: disable_put_regulator(pdata); usb_put_hcd(hcd); err_io: iounmap(regs); return ret; } /** * ehci_hcd_omap_remove - shutdown processing for EHCI HCDs * @pdev: USB Host Controller being removed * * Reverses the effect of usb_ehci_hcd_omap_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_omap_remove(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct usb_hcd *hcd = dev_get_drvdata(dev); usb_remove_hcd(hcd); omap_usbhs_disable(dev); disable_put_regulator(dev->platform_data); iounmap(hcd->regs); usb_put_hcd(hcd); return 0; } static void ehci_hcd_omap_shutdown(struct platform_device *pdev) { struct usb_hcd *hcd = dev_get_drvdata(&pdev->dev); if (hcd->driver->shutdown) hcd->driver->shutdown(hcd); } static struct platform_driver ehci_hcd_omap_driver = { .probe = ehci_hcd_omap_probe, .remove = ehci_hcd_omap_remove, .shutdown = ehci_hcd_omap_shutdown, /*.suspend = ehci_hcd_omap_suspend, */ /*.resume = ehci_hcd_omap_resume, */ .driver = { .name = "ehci-omap", } }; /*-------------------------------------------------------------------------*/ static const struct hc_driver ehci_omap_hc_driver = { .description = hcd_name, .product_desc = "OMAP-EHCI Host Controller", .hcd_priv_size = sizeof(struct ehci_hcd), /* * generic hardware linkage */ .irq = ehci_irq, .flags = HCD_MEMORY | HCD_USB2, /* * basic lifecycle operations */ .reset = ehci_init, .start = ehci_run, .stop = ehci_stop, .shutdown = ehci_shutdown, /* * managing i/o requests and associated device resources */ .urb_enqueue = ehci_urb_enqueue, .urb_dequeue = ehci_urb_dequeue, .endpoint_disable = ehci_endpoint_disable, .endpoint_reset = ehci_endpoint_reset, /* * scheduling support */ .get_frame_number = ehci_get_frame, /* * root hub support */ .hub_status_data = ehci_hub_status_data, .hub_control = ehci_hub_control, .bus_suspend = ehci_bus_suspend, .bus_resume = ehci_bus_resume, .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, }; MODULE_ALIAS("platform:omap-ehci"); MODULE_AUTHOR("Texas Instruments, Inc."); MODULE_AUTHOR("Felipe Balbi ");