diff options
Diffstat (limited to 'drivers/usb/host/ehci-msm.c')
| -rw-r--r-- | drivers/usb/host/ehci-msm.c | 345 |
1 files changed, 345 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-msm.c b/drivers/usb/host/ehci-msm.c new file mode 100644 index 00000000000..413f4deca53 --- /dev/null +++ b/drivers/usb/host/ehci-msm.c @@ -0,0 +1,345 @@ +/* ehci-msm.c - HSUSB Host Controller Driver Implementation + * + * Copyright (c) 2008-2010, Code Aurora Forum. All rights reserved. + * + * Partly derived from ehci-fsl.c and ehci-hcd.c + * Copyright (c) 2000-2004 by David Brownell + * Copyright (c) 2005 MontaVista Software + * + * All source code in this file is licensed under the following license except + * where indicated. + * + * 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. + * + * 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, you can find it at http://www.fsf.org + */ + +#include <linux/platform_device.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/pm_runtime.h> + +#include <linux/usb/otg.h> +#include <linux/usb/msm_hsusb_hw.h> + +#define MSM_USB_BASE (hcd->regs) + +static struct otg_transceiver *otg; + +/* + * ehci_run defined in drivers/usb/host/ehci-hcd.c reset the controller and + * the configuration settings in ehci_msm_reset vanish after controller is + * reset. Resetting the controler in ehci_run seems to be un-necessary + * provided HCD reset the controller before calling ehci_run. Most of the HCD + * do but some are not. So this function is same as ehci_run but we don't + * reset the controller here. + */ +static int ehci_msm_run(struct usb_hcd *hcd) +{ + struct ehci_hcd *ehci = hcd_to_ehci(hcd); + u32 temp; + u32 hcc_params; + + hcd->uses_new_polling = 1; + + ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list); + ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next); + + /* + * hcc_params controls whether ehci->regs->segment must (!!!) + * be used; it constrains QH/ITD/SITD and QTD locations. + * pci_pool consistent memory always uses segment zero. + * streaming mappings for I/O buffers, like pci_map_single(), + * can return segments above 4GB, if the device allows. + * + * NOTE: the dma mask is visible through dma_supported(), so + * drivers can pass this info along ... like NETIF_F_HIGHDMA, + * Scsi_Host.highmem_io, and so forth. It's readonly to all + * host side drivers though. + */ + hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params); + if (HCC_64BIT_ADDR(hcc_params)) + ehci_writel(ehci, 0, &ehci->regs->segment); + + /* + * Philips, Intel, and maybe others need CMD_RUN before the + * root hub will detect new devices (why?); NEC doesn't + */ + ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET); + ehci->command |= CMD_RUN; + ehci_writel(ehci, ehci->command, &ehci->regs->command); + dbg_cmd(ehci, "init", ehci->command); + + /* + * Start, enabling full USB 2.0 functionality ... usb 1.1 devices + * are explicitly handed to companion controller(s), so no TT is + * involved with the root hub. (Except where one is integrated, + * and there's no companion controller unless maybe for USB OTG.) + * + * Turning on the CF flag will transfer ownership of all ports + * from the companions to the EHCI controller. If any of the + * companions are in the middle of a port reset at the time, it + * could cause trouble. Write-locking ehci_cf_port_reset_rwsem + * guarantees that no resets are in progress. After we set CF, + * a short delay lets the hardware catch up; new resets shouldn't + * be started before the port switching actions could complete. + */ + down_write(&ehci_cf_port_reset_rwsem); + hcd->state = HC_STATE_RUNNING; + ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag); + ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */ + usleep_range(5000, 5500); + up_write(&ehci_cf_port_reset_rwsem); + ehci->last_periodic_enable = ktime_get_real(); + + temp = HC_VERSION(ehci_readl(ehci, &ehci->caps->hc_capbase)); + ehci_info(ehci, + "USB %x.%x started, EHCI %x.%02x%s\n", + ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f), + temp >> 8, temp & 0xff, + ignore_oc ? ", overcurrent ignored" : ""); + + ehci_writel(ehci, INTR_MASK, + &ehci->regs->intr_enable); /* Turn On Interrupts */ + + /* GRR this is run-once init(), being done every time the HC starts. + * So long as they're part of class devices, we can't do it init() + * since the class device isn't created that early. + */ + create_debug_files(ehci); + create_companion_file(ehci); + + return 0; +} + +static int ehci_msm_reset(struct usb_hcd *hcd) +{ + struct ehci_hcd *ehci = hcd_to_ehci(hcd); + int retval; + + ehci->caps = USB_CAPLENGTH; + ehci->regs = USB_CAPLENGTH + + HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase)); + + /* cache the data to minimize the chip reads*/ + ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); + + hcd->has_tt = 1; + ehci->sbrn = HCD_USB2; + + /* data structure init */ + retval = ehci_init(hcd); + if (retval) + return retval; + + retval = ehci_reset(ehci); + if (retval) + return retval; + + /* bursts of unspecified length. */ + writel(0, USB_AHBBURST); + /* Use the AHB transactor */ + writel(0, USB_AHBMODE); + /* Disable streaming mode and select host mode */ + writel(0x13, USB_USBMODE); + + ehci_port_power(ehci, 1); + return 0; +} + +static struct hc_driver msm_hc_driver = { + .description = hcd_name, + .product_desc = "Qualcomm On-Chip EHCI Host Controller", + .hcd_priv_size = sizeof(struct ehci_hcd), + + /* + * generic hardware linkage + */ + .irq = ehci_irq, + .flags = HCD_USB2 | HCD_MEMORY, + + .reset = ehci_msm_reset, + .start = ehci_msm_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, + .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, + + /* + * scheduling support + */ + .get_frame_number = ehci_get_frame, + + /* + * root hub support + */ + .hub_status_data = ehci_hub_status_data, + .hub_control = ehci_hub_control, + .relinquish_port = ehci_relinquish_port, + .port_handed_over = ehci_port_handed_over, + + /* + * PM support + */ + .bus_suspend = ehci_bus_suspend, + .bus_resume = ehci_bus_resume, +}; + +static int ehci_msm_probe(struct platform_device *pdev) +{ + struct usb_hcd *hcd; + struct resource *res; + int ret; + + dev_dbg(&pdev->dev, "ehci_msm proble\n"); + + hcd = usb_create_hcd(&msm_hc_driver, &pdev->dev, dev_name(&pdev->dev)); + if (!hcd) { + dev_err(&pdev->dev, "Unable to create HCD\n"); + return -ENOMEM; + } + + hcd->irq = platform_get_irq(pdev, 0); + if (hcd->irq < 0) { + dev_err(&pdev->dev, "Unable to get IRQ resource\n"); + ret = hcd->irq; + goto put_hcd; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "Unable to get memory resource\n"); + ret = -ENODEV; + goto put_hcd; + } + + hcd->rsrc_start = res->start; + hcd->rsrc_len = resource_size(res); + hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); + if (!hcd->regs) { + dev_err(&pdev->dev, "ioremap failed\n"); + ret = -ENOMEM; + goto put_hcd; + } + + /* + * OTG driver takes care of PHY initialization, clock management, + * powering up VBUS, mapping of registers address space and power + * management. + */ + otg = otg_get_transceiver(); + if (!otg) { + dev_err(&pdev->dev, "unable to find transceiver\n"); + ret = -ENODEV; + goto unmap; + } + + ret = otg_set_host(otg, &hcd->self); + if (ret < 0) { + dev_err(&pdev->dev, "unable to register with transceiver\n"); + goto put_transceiver; + } + + device_init_wakeup(&pdev->dev, 1); + /* + * OTG device parent of HCD takes care of putting + * hardware into low power mode. + */ + pm_runtime_no_callbacks(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + return 0; + +put_transceiver: + otg_put_transceiver(otg); +unmap: + iounmap(hcd->regs); +put_hcd: + usb_put_hcd(hcd); + + return ret; +} + +static int __devexit ehci_msm_remove(struct platform_device *pdev) +{ + struct usb_hcd *hcd = platform_get_drvdata(pdev); + + device_init_wakeup(&pdev->dev, 0); + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + + otg_set_host(otg, NULL); + otg_put_transceiver(otg); + + usb_put_hcd(hcd); + + return 0; +} + +#ifdef CONFIG_PM +static int ehci_msm_pm_suspend(struct device *dev) +{ + struct usb_hcd *hcd = dev_get_drvdata(dev); + bool wakeup = device_may_wakeup(dev); + + dev_dbg(dev, "ehci-msm PM suspend\n"); + + /* + * EHCI helper function has also the same check before manipulating + * port wakeup flags. We do check here the same condition before + * calling the same helper function to avoid bringing hardware + * from Low power mode when there is no need for adjusting port + * wakeup flags. + */ + if (hcd->self.root_hub->do_remote_wakeup && !wakeup) { + pm_runtime_resume(dev); + ehci_prepare_ports_for_controller_suspend(hcd_to_ehci(hcd), + wakeup); + } + + return 0; +} + +static int ehci_msm_pm_resume(struct device *dev) +{ + struct usb_hcd *hcd = dev_get_drvdata(dev); + + dev_dbg(dev, "ehci-msm PM resume\n"); + ehci_prepare_ports_for_controller_resume(hcd_to_ehci(hcd)); + + return 0; +} +#else +#define ehci_msm_pm_suspend NULL +#define ehci_msm_pm_resume NULL +#endif + +static const struct dev_pm_ops ehci_msm_dev_pm_ops = { + .suspend = ehci_msm_pm_suspend, + .resume = ehci_msm_pm_resume, +}; + +static struct platform_driver ehci_msm_driver = { + .probe = ehci_msm_probe, + .remove = __devexit_p(ehci_msm_remove), + .driver = { + .name = "msm_hsusb_host", + .pm = &ehci_msm_dev_pm_ops, + }, +}; |