diff options
Diffstat (limited to 'drivers/usb/host/ehci-sh.c')
| -rw-r--r-- | drivers/usb/host/ehci-sh.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-sh.c b/drivers/usb/host/ehci-sh.c new file mode 100644 index 000000000..c25c51d26 --- /dev/null +++ b/drivers/usb/host/ehci-sh.c @@ -0,0 +1,182 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SuperH EHCI host controller driver + * + * Copyright (C) 2010 Paul Mundt + * + * Based on ohci-sh.c and ehci-atmel.c. + */ +#include <linux/platform_device.h> +#include <linux/clk.h> + +struct ehci_sh_priv { + struct clk *iclk, *fclk; + struct usb_hcd *hcd; +}; + +static int ehci_sh_reset(struct usb_hcd *hcd) +{ + struct ehci_hcd *ehci = hcd_to_ehci(hcd); + + ehci->caps = hcd->regs; + + return ehci_setup(hcd); +} + +static const struct hc_driver ehci_sh_hc_driver = { + .description = hcd_name, + .product_desc = "SuperH EHCI", + .hcd_priv_size = sizeof(struct ehci_hcd), + + /* + * generic hardware linkage + */ + .irq = ehci_irq, + .flags = HCD_USB2 | HCD_DMA | HCD_MEMORY | HCD_BH, + + /* + * basic lifecycle operations + */ + .reset = ehci_sh_reset, + .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, + +#ifdef CONFIG_PM + .bus_suspend = ehci_bus_suspend, + .bus_resume = ehci_bus_resume, +#endif + + .relinquish_port = ehci_relinquish_port, + .port_handed_over = ehci_port_handed_over, + .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, +}; + +static int ehci_hcd_sh_probe(struct platform_device *pdev) +{ + struct resource *res; + struct ehci_sh_priv *priv; + struct usb_hcd *hcd; + int irq, ret; + + if (usb_disabled()) + return -ENODEV; + + irq = platform_get_irq(pdev, 0); + if (irq <= 0) { + ret = -ENODEV; + goto fail_create_hcd; + } + + /* initialize hcd */ + hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev, + dev_name(&pdev->dev)); + if (!hcd) { + ret = -ENOMEM; + goto fail_create_hcd; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + hcd->regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(hcd->regs)) { + ret = PTR_ERR(hcd->regs); + goto fail_request_resource; + } + hcd->rsrc_start = res->start; + hcd->rsrc_len = resource_size(res); + + priv = devm_kzalloc(&pdev->dev, sizeof(struct ehci_sh_priv), + GFP_KERNEL); + if (!priv) { + ret = -ENOMEM; + goto fail_request_resource; + } + + /* These are optional, we don't care if they fail */ + priv->fclk = devm_clk_get(&pdev->dev, "usb_fck"); + if (IS_ERR(priv->fclk)) + priv->fclk = NULL; + + priv->iclk = devm_clk_get(&pdev->dev, "usb_ick"); + if (IS_ERR(priv->iclk)) + priv->iclk = NULL; + + clk_enable(priv->fclk); + clk_enable(priv->iclk); + + ret = usb_add_hcd(hcd, irq, IRQF_SHARED); + if (ret != 0) { + dev_err(&pdev->dev, "Failed to add hcd"); + goto fail_add_hcd; + } + device_wakeup_enable(hcd->self.controller); + + priv->hcd = hcd; + platform_set_drvdata(pdev, priv); + + return ret; + +fail_add_hcd: + clk_disable(priv->iclk); + clk_disable(priv->fclk); + +fail_request_resource: + usb_put_hcd(hcd); +fail_create_hcd: + dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret); + + return ret; +} + +static int ehci_hcd_sh_remove(struct platform_device *pdev) +{ + struct ehci_sh_priv *priv = platform_get_drvdata(pdev); + struct usb_hcd *hcd = priv->hcd; + + usb_remove_hcd(hcd); + usb_put_hcd(hcd); + + clk_disable(priv->fclk); + clk_disable(priv->iclk); + + return 0; +} + +static void ehci_hcd_sh_shutdown(struct platform_device *pdev) +{ + struct ehci_sh_priv *priv = platform_get_drvdata(pdev); + struct usb_hcd *hcd = priv->hcd; + + if (hcd->driver->shutdown) + hcd->driver->shutdown(hcd); +} + +static struct platform_driver ehci_hcd_sh_driver = { + .probe = ehci_hcd_sh_probe, + .remove = ehci_hcd_sh_remove, + .shutdown = ehci_hcd_sh_shutdown, + .driver = { + .name = "sh_ehci", + }, +}; + +MODULE_ALIAS("platform:sh_ehci"); |