diff options
Diffstat (limited to 'drivers/usb/host/ehci-spear.c')
| -rw-r--r-- | drivers/usb/host/ehci-spear.c | 212 |
1 files changed, 212 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..75c00873443 --- /dev/null +++ b/drivers/usb/host/ehci-spear.c @@ -0,0 +1,212 @@ +/* +* 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/platform_device.h> +#include <linux/clk.h> + +struct spear_ehci { + struct ehci_hcd ehci; + struct clk *clk; +}; + +#define to_spear_ehci(hcd) (struct spear_ehci *)hcd_to_ehci(hcd) + +static void spear_start_ehci(struct spear_ehci *ehci) +{ + clk_enable(ehci->clk); +} + +static void spear_stop_ehci(struct spear_ehci *ehci) +{ + clk_disable(ehci->clk); +} + +static int ehci_spear_setup(struct usb_hcd *hcd) +{ + struct ehci_hcd *ehci = hcd_to_ehci(hcd); + int retval = 0; + + /* registers start at offset 0x0 */ + ehci->caps = hcd->regs; + ehci->regs = hcd->regs + HC_LENGTH(ehci_readl(ehci, + &ehci->caps->hc_capbase)); + /* cache this readonly data; minimize chip reads */ + ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); + retval = ehci_halt(ehci); + if (retval) + return retval; + + retval = ehci_init(hcd); + if (retval) + return retval; + + ehci_reset(ehci); + ehci_port_power(ehci, 0); + + return retval; +} + +static const struct hc_driver ehci_spear_hc_driver = { + .description = hcd_name, + .product_desc = "SPEAr EHCI", + .hcd_priv_size = sizeof(struct spear_ehci), + + /* generic hardware linkage */ + .irq = ehci_irq, + .flags = HCD_MEMORY | HCD_USB2, + + /* basic lifecycle operations */ + .reset = ehci_spear_setup, + .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, + .relinquish_port = ehci_relinquish_port, + .port_handed_over = ehci_port_handed_over, + .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, +}; + +static int spear_ehci_hcd_drv_probe(struct platform_device *pdev) +{ + struct usb_hcd *hcd ; + struct spear_ehci *ehci; + struct resource *res; + struct clk *usbh_clk; + const struct hc_driver *driver = &ehci_spear_hc_driver; + int *pdata = pdev->dev.platform_data; + int irq, retval; + char clk_name[20] = "usbh_clk"; + + if (pdata == NULL) + return -EFAULT; + + if (usb_disabled()) + return -ENODEV; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + retval = irq; + goto fail_irq_get; + } + + if (*pdata >= 0) + sprintf(clk_name, "usbh.%01d_clk", *pdata); + + usbh_clk = clk_get(NULL, clk_name); + if (IS_ERR(usbh_clk)) { + dev_err(&pdev->dev, "Error getting interface clock\n"); + retval = PTR_ERR(usbh_clk); + goto fail_get_usbh_clk; + } + + hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); + if (!hcd) { + retval = -ENOMEM; + goto fail_create_hcd; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + retval = -ENODEV; + goto fail_request_resource; + } + + hcd->rsrc_start = res->start; + hcd->rsrc_len = resource_size(res); + if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, + driver->description)) { + retval = -EBUSY; + goto fail_request_resource; + } + + hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); + if (hcd->regs == NULL) { + dev_dbg(&pdev->dev, "error mapping memory\n"); + retval = -ENOMEM; + goto fail_ioremap; + } + + ehci = (struct spear_ehci *)hcd_to_ehci(hcd); + ehci->clk = usbh_clk; + + spear_start_ehci(ehci); + retval = usb_add_hcd(hcd, irq, IRQF_SHARED | IRQF_DISABLED); + if (retval) + goto fail_add_hcd; + + return retval; + +fail_add_hcd: + spear_stop_ehci(ehci); + iounmap(hcd->regs); +fail_ioremap: + release_mem_region(hcd->rsrc_start, hcd->rsrc_len); +fail_request_resource: + usb_put_hcd(hcd); +fail_create_hcd: + clk_put(usbh_clk); +fail_get_usbh_clk: +fail_irq_get: + 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 *ehci_p = to_spear_ehci(hcd); + + if (!hcd) + return 0; + if (in_interrupt()) + BUG(); + usb_remove_hcd(hcd); + + if (ehci_p->clk) + spear_stop_ehci(ehci_p); + iounmap(hcd->regs); + release_mem_region(hcd->rsrc_start, hcd->rsrc_len); + usb_put_hcd(hcd); + + if (ehci_p->clk) + clk_put(ehci_p->clk); + + return 0; +} + +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 + } +}; + +MODULE_ALIAS("platform:spear-ehci"); |