diff options
Diffstat (limited to 'drivers/usb/host/ehci-spear.c')
| -rw-r--r-- | drivers/usb/host/ehci-spear.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-spear.c b/drivers/usb/host/ehci-spear.c new file mode 100644 index 00000000000..1d59958ad0c --- /dev/null +++ b/drivers/usb/host/ehci-spear.c @@ -0,0 +1,195 @@ +/* +* Driver for EHCI HCD on SPEAr SOC +* +* Copyright (C) 2010 ST Micro Electronics, +* Deepak Sikri <deepak.sikri@st.com> +* +* Based on various ehci-*.c drivers +* +* 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/clk.h> +#include <linux/dma-mapping.h> +#include <linux/io.h> +#include <linux/jiffies.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/pm.h> +#include <linux/usb.h> +#include <linux/usb/hcd.h> + +#include "ehci.h" + +#define DRIVER_DESC "EHCI SPEAr driver" + +static const char hcd_name[] = "SPEAr-ehci"; + +struct spear_ehci { + struct clk *clk; +}; + +#define to_spear_ehci(hcd) (struct spear_ehci *)(hcd_to_ehci(hcd)->priv) + +static struct hc_driver __read_mostly ehci_spear_hc_driver; + +#ifdef CONFIG_PM_SLEEP +static int ehci_spear_drv_suspend(struct device *dev) +{ + struct usb_hcd *hcd = dev_get_drvdata(dev); + bool do_wakeup = device_may_wakeup(dev); + + return ehci_suspend(hcd, do_wakeup); +} + +static int ehci_spear_drv_resume(struct device *dev) +{ + struct usb_hcd *hcd = dev_get_drvdata(dev); + + ehci_resume(hcd, false); + return 0; +} +#endif /* CONFIG_PM_SLEEP */ + +static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend, + ehci_spear_drv_resume); + +static int spear_ehci_hcd_drv_probe(struct platform_device *pdev) +{ + struct usb_hcd *hcd ; + struct spear_ehci *sehci; + struct resource *res; + struct clk *usbh_clk; + const struct hc_driver *driver = &ehci_spear_hc_driver; + int irq, retval; + + if (usb_disabled()) + return -ENODEV; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + retval = irq; + goto fail; + } + + /* + * 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. + */ + retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); + if (retval) + goto fail; + + usbh_clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(usbh_clk)) { + dev_err(&pdev->dev, "Error getting interface clock\n"); + retval = PTR_ERR(usbh_clk); + goto fail; + } + + hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); + if (!hcd) { + retval = -ENOMEM; + goto fail; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + retval = -ENODEV; + goto err_put_hcd; + } + + hcd->rsrc_start = res->start; + hcd->rsrc_len = resource_size(res); + hcd->regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(hcd->regs)) { + retval = PTR_ERR(hcd->regs); + goto err_put_hcd; + } + + sehci = to_spear_ehci(hcd); + sehci->clk = usbh_clk; + + /* registers start at offset 0x0 */ + hcd_to_ehci(hcd)->caps = hcd->regs; + + clk_prepare_enable(sehci->clk); + retval = usb_add_hcd(hcd, irq, IRQF_SHARED); + if (retval) + goto err_stop_ehci; + + device_wakeup_enable(hcd->self.controller); + return retval; + +err_stop_ehci: + clk_disable_unprepare(sehci->clk); +err_put_hcd: + usb_put_hcd(hcd); +fail: + dev_err(&pdev->dev, "init fail, %d\n", retval); + + return retval ; +} + +static int spear_ehci_hcd_drv_remove(struct platform_device *pdev) +{ + struct usb_hcd *hcd = platform_get_drvdata(pdev); + struct spear_ehci *sehci = to_spear_ehci(hcd); + + usb_remove_hcd(hcd); + + if (sehci->clk) + clk_disable_unprepare(sehci->clk); + usb_put_hcd(hcd); + + return 0; +} + +static struct of_device_id spear_ehci_id_table[] = { + { .compatible = "st,spear600-ehci", }, + { }, +}; + +static struct platform_driver spear_ehci_hcd_driver = { + .probe = spear_ehci_hcd_drv_probe, + .remove = spear_ehci_hcd_drv_remove, + .shutdown = usb_hcd_platform_shutdown, + .driver = { + .name = "spear-ehci", + .bus = &platform_bus_type, + .pm = &ehci_spear_pm_ops, + .of_match_table = spear_ehci_id_table, + } +}; + +static const struct ehci_driver_overrides spear_overrides __initdata = { + .extra_priv_size = sizeof(struct spear_ehci), +}; + +static int __init ehci_spear_init(void) +{ + if (usb_disabled()) + return -ENODEV; + + pr_info("%s: " DRIVER_DESC "\n", hcd_name); + + ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides); + return platform_driver_register(&spear_ehci_hcd_driver); +} +module_init(ehci_spear_init); + +static void __exit ehci_spear_cleanup(void) +{ + platform_driver_unregister(&spear_ehci_hcd_driver); +} +module_exit(ehci_spear_cleanup); + +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_ALIAS("platform:spear-ehci"); +MODULE_AUTHOR("Deepak Sikri"); +MODULE_LICENSE("GPL"); |