USB host: Adding USB ehci & ohci support for spear platform
This patch adds support for ehci and ohci controller in the SPEAr platform. Changes since V2: added clear_tt_buffer_complete in ehci_spear_hc_driver Signed-off-by: Deepak Sikri <deepak.sikri@st.com> Signed-off-by: Viresh Kumar <viresh.kumar@st.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Deepak Sikri
committed by
Greg Kroah-Hartman
Greg Kroah-Hartman
parent
ad78acafee
commit
c8c38de9d8
240
drivers/usb/host/ohci-spear.c
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240
drivers/usb/host/ohci-spear.c
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/*
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* OHCI HCD (Host Controller Driver) for USB.
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*
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* Copyright (C) 2010 ST Microelectronics.
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* Deepak Sikri<deepak.sikri@st.com>
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*
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* Based on various ohci-*.c drivers
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/signal.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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struct spear_ohci {
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struct ohci_hcd ohci;
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struct clk *clk;
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};
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#define to_spear_ohci(hcd) (struct spear_ohci *)hcd_to_ohci(hcd)
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static void spear_start_ohci(struct spear_ohci *ohci)
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{
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clk_enable(ohci->clk);
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}
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static void spear_stop_ohci(struct spear_ohci *ohci)
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{
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clk_disable(ohci->clk);
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}
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static int __devinit ohci_spear_start(struct usb_hcd *hcd)
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{
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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int ret;
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ret = ohci_init(ohci);
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if (ret < 0)
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return ret;
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ohci->regs = hcd->regs;
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ret = ohci_run(ohci);
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if (ret < 0) {
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dev_err(hcd->self.controller, "can't start\n");
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ohci_stop(hcd);
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return ret;
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}
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create_debug_files(ohci);
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#ifdef DEBUG
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ohci_dump(ohci, 1);
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#endif
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return 0;
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}
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static const struct hc_driver ohci_spear_hc_driver = {
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.description = hcd_name,
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.product_desc = "SPEAr OHCI",
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.hcd_priv_size = sizeof(struct spear_ohci),
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/* generic hardware linkage */
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.irq = ohci_irq,
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.flags = HCD_USB11 | HCD_MEMORY,
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/* basic lifecycle operations */
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.start = ohci_spear_start,
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.stop = ohci_stop,
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.shutdown = ohci_shutdown,
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#ifdef CONFIG_PM
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.bus_suspend = ohci_bus_suspend,
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.bus_resume = ohci_bus_resume,
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#endif
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/* managing i/o requests and associated device resources */
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.urb_enqueue = ohci_urb_enqueue,
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.urb_dequeue = ohci_urb_dequeue,
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.endpoint_disable = ohci_endpoint_disable,
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/* scheduling support */
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.get_frame_number = ohci_get_frame,
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/* root hub support */
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.hub_status_data = ohci_hub_status_data,
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.hub_control = ohci_hub_control,
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.start_port_reset = ohci_start_port_reset,
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};
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static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
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{
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const struct hc_driver *driver = &ohci_spear_hc_driver;
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struct usb_hcd *hcd = NULL;
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struct clk *usbh_clk;
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struct spear_ohci *ohci_p;
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struct resource *res;
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int retval, irq;
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int *pdata = pdev->dev.platform_data;
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char clk_name[20] = "usbh_clk";
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if (pdata == NULL)
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return -EFAULT;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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retval = irq;
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goto fail_irq_get;
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}
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if (*pdata >= 0)
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sprintf(clk_name, "usbh.%01d_clk", *pdata);
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usbh_clk = clk_get(NULL, clk_name);
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if (IS_ERR(usbh_clk)) {
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dev_err(&pdev->dev, "Error getting interface clock\n");
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retval = PTR_ERR(usbh_clk);
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goto fail_get_usbh_clk;
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}
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hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
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if (!hcd) {
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retval = -ENOMEM;
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goto fail_create_hcd;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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retval = -ENODEV;
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goto fail_request_resource;
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}
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hcd->rsrc_start = pdev->resource[0].start;
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hcd->rsrc_len = resource_size(res);
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if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
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dev_dbg(&pdev->dev, "request_mem_region failed\n");
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retval = -EBUSY;
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goto fail_request_resource;
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}
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hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
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if (!hcd->regs) {
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dev_dbg(&pdev->dev, "ioremap failed\n");
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retval = -ENOMEM;
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goto fail_ioremap;
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}
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ohci_p = (struct spear_ohci *)hcd_to_ohci(hcd);
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ohci_p->clk = usbh_clk;
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spear_start_ohci(ohci_p);
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ohci_hcd_init(hcd_to_ohci(hcd));
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retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), IRQF_DISABLED);
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if (retval == 0)
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return retval;
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spear_stop_ohci(ohci_p);
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iounmap(hcd->regs);
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fail_ioremap:
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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fail_request_resource:
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usb_put_hcd(hcd);
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fail_create_hcd:
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clk_put(usbh_clk);
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fail_get_usbh_clk:
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fail_irq_get:
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dev_err(&pdev->dev, "init fail, %d\n", retval);
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return retval;
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}
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static int spear_ohci_hcd_drv_remove(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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struct spear_ohci *ohci_p = to_spear_ohci(hcd);
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usb_remove_hcd(hcd);
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if (ohci_p->clk)
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spear_stop_ohci(ohci_p);
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iounmap(hcd->regs);
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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usb_put_hcd(hcd);
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if (ohci_p->clk)
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clk_put(ohci_p->clk);
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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#if defined(CONFIG_PM)
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static int spear_ohci_hcd_drv_suspend(struct platform_device *dev,
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pm_message_t message)
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{
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struct usb_hcd *hcd = platform_get_drvdata(dev);
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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struct spear_ohci *ohci_p = to_spear_ohci(hcd);
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if (time_before(jiffies, ohci->next_statechange))
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msleep(5);
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ohci->next_statechange = jiffies;
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spear_stop_ohci(ohci_p);
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ohci_to_hcd(ohci)->state = HC_STATE_SUSPENDED;
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return 0;
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}
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static int spear_ohci_hcd_drv_resume(struct platform_device *dev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(dev);
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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struct spear_ohci *ohci_p = to_spear_ohci(hcd);
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if (time_before(jiffies, ohci->next_statechange))
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msleep(5);
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ohci->next_statechange = jiffies;
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spear_start_ohci(ohci_p);
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ohci_finish_controller_resume(hcd);
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return 0;
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}
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#endif
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/* Driver definition to register with the platform bus */
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static struct platform_driver spear_ohci_hcd_driver = {
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.probe = spear_ohci_hcd_drv_probe,
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.remove = spear_ohci_hcd_drv_remove,
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#ifdef CONFIG_PM
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.suspend = spear_ohci_hcd_drv_suspend,
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.resume = spear_ohci_hcd_drv_resume,
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#endif
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.driver = {
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.owner = THIS_MODULE,
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.name = "spear-ohci",
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},
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};
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MODULE_ALIAS("platform:spear-ohci");
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