/* * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * 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, write to the Free Software Foundation, * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <linux/platform_device.h> #include <linux/clk.h> #include <linux/delay.h> #include <linux/usb/otg.h> #include <linux/usb/ulpi.h> #include <linux/slab.h> #include <mach/mxc_ehci.h> #include <asm/mach-types.h> #define ULPI_VIEWPORT_OFFSET 0x170 struct ehci_mxc_priv { struct clk *usbclk, *ahbclk, *phy1clk; struct usb_hcd *hcd; }; /* called during probe() after chip reset completes */ static int ehci_mxc_setup(struct usb_hcd *hcd) { struct ehci_hcd *ehci = hcd_to_ehci(hcd); int retval; dbg_hcs_params(ehci, "reset"); dbg_hcc_params(ehci, "reset"); /* cache this readonly data; minimize chip reads */ ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); hcd->has_tt = 1; retval = ehci_halt(ehci); if (retval) return retval; /* data structure init */ retval = ehci_init(hcd); if (retval) return retval; ehci->sbrn = 0x20; ehci_reset(ehci); ehci_port_power(ehci, 0); return 0; } static const struct hc_driver ehci_mxc_hc_driver = { .description = hcd_name, .product_desc = "Freescale On-Chip EHCI Host Controller", .hcd_priv_size = sizeof(struct ehci_hcd), /* * generic hardware linkage */ .irq = ehci_irq, .flags = HCD_USB2 | HCD_MEMORY, /* * basic lifecycle operations */ .reset = ehci_mxc_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 ehci_mxc_drv_probe(struct platform_device *pdev) { struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data; struct usb_hcd *hcd; struct resource *res; int irq, ret; unsigned int flags; struct ehci_mxc_priv *priv; struct device *dev = &pdev->dev; struct ehci_hcd *ehci; dev_info(&pdev->dev, "initializing i.MX USB Controller\n"); if (!pdata) { dev_err(dev, "No platform data given, bailing out.\n"); return -EINVAL; } irq = platform_get_irq(pdev, 0); hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev)); if (!hcd) return -ENOMEM; priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (!priv) { ret = -ENOMEM; goto err_alloc; } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(dev, "Found HC with no register addr. Check setup!\n"); ret = -ENODEV; goto err_get_resource; } hcd->rsrc_start = res->start; hcd->rsrc_len = resource_size(res); if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { dev_dbg(dev, "controller already in use\n"); ret = -EBUSY; goto err_request_mem; } hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); if (!hcd->regs) { dev_err(dev, "error mapping memory\n"); ret = -EFAULT; goto err_ioremap; } /* enable clocks */ priv->usbclk = clk_get(dev, "usb"); if (IS_ERR(priv->usbclk)) { ret = PTR_ERR(priv->usbclk); goto err_clk; } clk_enable(priv->usbclk); if (!cpu_is_mx35() && !cpu_is_mx25()) { priv->ahbclk = clk_get(dev, "usb_ahb"); if (IS_ERR(priv->ahbclk)) { ret = PTR_ERR(priv->ahbclk); goto err_clk_ahb; } clk_enable(priv->ahbclk); } /* "dr" device has its own clock on i.MX51 */ if (cpu_is_mx51() && (pdev->id == 0)) { priv->phy1clk = clk_get(dev, "usb_phy1"); if (IS_ERR(priv->phy1clk)) { ret = PTR_ERR(priv->phy1clk); goto err_clk_phy; } clk_enable(priv->phy1clk); } /* call platform specific init function */ if (pdata->init) { ret = pdata->init(pdev); if (ret) { dev_err(dev, "platform init failed\n"); goto err_init; } /* platforms need some time to settle changed IO settings */ mdelay(10); } ehci = hcd_to_ehci(hcd); /* EHCI registers start at offset 0x100 */ ehci->caps = hcd->regs + 0x100; ehci->regs = hcd->regs + 0x100 + HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase)); /* set up the PORTSCx register */ ehci_writel(ehci, pdata->portsc, &ehci->regs->port_status[0]); /* is this really needed? */ msleep(10); /* Initialize the transceiver */ if (pdata->otg) { pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET; ret = otg_init(pdata->otg); if (ret) { dev_err(dev, "unable to init transceiver, probably missing\n"); ret = -ENODEV; goto err_add; } ret = otg_set_vbus(pdata->otg, 1); if (ret) { dev_err(dev, "unable to enable vbus on transceiver\n"); goto err_add; } } priv->hcd = hcd; platform_set_drvdata(pdev, priv); ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED); if (ret) goto err_add; if (pdata->otg) { /* * efikamx and efikasb have some hardware bug which is * preventing usb to work unless CHRGVBUS is set. * It's in violation of USB specs */ if (machine_is_mx51_efikamx() || machine_is_mx51_efikasb()) { flags = otg_io_read(pdata->otg, ULPI_OTG_CTRL); flags |= ULPI_OTG_CTRL_CHRGVBUS; ret = otg_io_write(pdata->otg, flags, ULPI_OTG_CTRL); if (ret) { dev_err(dev, "unable to set CHRVBUS\n"); goto err_add; } } } return 0; err_add: if (pdata && pdata->exit) pdata->exit(pdev); err_init: if (priv->phy1clk) { clk_disable(priv->phy1clk); clk_put(priv->phy1clk); } err_clk_phy: if (priv->ahbclk) { clk_disable(priv->ahbclk); clk_put(priv->ahbclk); } err_clk_ahb: clk_disable(priv->usbclk); clk_put(priv->usbclk); err_clk: iounmap(hcd->regs); err_ioremap: release_mem_region(hcd->rsrc_start, hcd->rsrc_len); err_request_mem: err_get_resource: kfree(priv); err_alloc: usb_put_hcd(hcd); return ret; } static int __exit ehci_mxc_drv_remove(struct platform_device *pdev) { struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data; struct ehci_mxc_priv *priv = platform_get_drvdata(pdev); struct usb_hcd *hcd = priv->hcd; if (pdata && pdata->exit) pdata->exit(pdev); if (pdata->otg) otg_shutdown(pdata->otg); usb_remove_hcd(hcd); iounmap(hcd->regs); release_mem_region(hcd->rsrc_start, hcd->rsrc_len); usb_put_hcd(hcd); platform_set_drvdata(pdev, NULL); clk_disable(priv->usbclk); clk_put(priv->usbclk); if (priv->ahbclk) { clk_disable(priv->ahbclk); clk_put(priv->ahbclk); } if (priv->phy1clk) { clk_disable(priv->phy1clk); clk_put(priv->phy1clk); } kfree(priv); return 0; } static void ehci_mxc_drv_shutdown(struct platform_device *pdev) { struct ehci_mxc_priv *priv = platform_get_drvdata(pdev); struct usb_hcd *hcd = priv->hcd; if (hcd->driver->shutdown) hcd->driver->shutdown(hcd); } MODULE_ALIAS("platform:mxc-ehci"); static struct platform_driver ehci_mxc_driver = { .probe = ehci_mxc_drv_probe, .remove = __exit_p(ehci_mxc_drv_remove), .shutdown = ehci_mxc_drv_shutdown, .driver = { .name = "mxc-ehci", }, };