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+/*
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+ * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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+ * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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+ * for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software Foundation,
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+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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+ */
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+
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+#include <linux/platform_device.h>
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+#include <linux/clk.h>
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+#include <linux/delay.h>
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+#include <linux/usb/otg.h>
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+
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+#include <mach/mxc_ehci.h>
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+
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+#define ULPI_VIEWPORT_OFFSET 0x170
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+#define PORTSC_OFFSET 0x184
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+#define USBMODE_OFFSET 0x1a8
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+#define USBMODE_CM_HOST 3
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+
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+struct ehci_mxc_priv {
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+ struct clk *usbclk, *ahbclk;
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+ struct usb_hcd *hcd;
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+};
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+
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+/* called during probe() after chip reset completes */
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+static int ehci_mxc_setup(struct usb_hcd *hcd)
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+{
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+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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+ int retval;
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+
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+ /* EHCI registers start at offset 0x100 */
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+ ehci->caps = hcd->regs + 0x100;
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+ ehci->regs = hcd->regs + 0x100 +
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+ HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
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+ dbg_hcs_params(ehci, "reset");
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+ dbg_hcc_params(ehci, "reset");
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+
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+ /* cache this readonly data; minimize chip reads */
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+ ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
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+
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+ retval = ehci_halt(ehci);
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+ if (retval)
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+ return retval;
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+
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+ /* data structure init */
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+ retval = ehci_init(hcd);
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+ if (retval)
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+ return retval;
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+
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+ hcd->has_tt = 1;
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+
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+ ehci->sbrn = 0x20;
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+
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+ ehci_reset(ehci);
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+
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+ ehci_port_power(ehci, 0);
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+ return 0;
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+}
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+
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+static const struct hc_driver ehci_mxc_hc_driver = {
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+ .description = hcd_name,
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+ .product_desc = "Freescale On-Chip EHCI Host Controller",
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+ .hcd_priv_size = sizeof(struct ehci_hcd),
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+
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+ /*
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+ * generic hardware linkage
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+ */
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+ .irq = ehci_irq,
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+ .flags = HCD_USB2 | HCD_MEMORY,
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+
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+ /*
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+ * basic lifecycle operations
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+ */
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+ .reset = ehci_mxc_setup,
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+ .start = ehci_run,
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+ .stop = ehci_stop,
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+ .shutdown = ehci_shutdown,
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+
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+ /*
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+ * managing i/o requests and associated device resources
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+ */
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+ .urb_enqueue = ehci_urb_enqueue,
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+ .urb_dequeue = ehci_urb_dequeue,
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+ .endpoint_disable = ehci_endpoint_disable,
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+
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+ /*
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+ * scheduling support
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+ */
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+ .get_frame_number = ehci_get_frame,
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+
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+ /*
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+ * root hub support
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+ */
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+ .hub_status_data = ehci_hub_status_data,
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+ .hub_control = ehci_hub_control,
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+ .bus_suspend = ehci_bus_suspend,
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+ .bus_resume = ehci_bus_resume,
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+ .relinquish_port = ehci_relinquish_port,
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+ .port_handed_over = ehci_port_handed_over,
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+};
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+
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+static int ehci_mxc_drv_probe(struct platform_device *pdev)
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+{
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+ struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
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+ struct usb_hcd *hcd;
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+ struct resource *res;
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+ int irq, ret, temp;
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+ struct ehci_mxc_priv *priv;
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+ struct device *dev = &pdev->dev;
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+
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+ dev_info(&pdev->dev, "initializing i.MX USB Controller\n");
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+
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+ if (!pdata) {
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+ dev_err(dev, "No platform data given, bailing out.\n");
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+ return -EINVAL;
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+ }
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+
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+ irq = platform_get_irq(pdev, 0);
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+
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+ hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev));
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+ if (!hcd)
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+ return -ENOMEM;
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+
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+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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+ if (!priv) {
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+ ret = -ENOMEM;
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+ goto err_alloc;
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+ }
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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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+ dev_err(dev, "Found HC with no register addr. Check setup!\n");
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+ ret = -ENODEV;
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+ goto err_get_resource;
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+ }
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+
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+ hcd->rsrc_start = res->start;
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+ hcd->rsrc_len = resource_size(res);
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+
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+ if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
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+ dev_dbg(dev, "controller already in use\n");
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+ ret = -EBUSY;
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+ goto err_request_mem;
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+ }
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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_err(dev, "error mapping memory\n");
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+ ret = -EFAULT;
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+ goto err_ioremap;
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+ }
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+
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+ /* enable clocks */
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+ priv->usbclk = clk_get(dev, "usb");
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+ if (IS_ERR(priv->usbclk)) {
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+ ret = PTR_ERR(priv->usbclk);
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+ goto err_clk;
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+ }
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+ clk_enable(priv->usbclk);
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+
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+ if (!cpu_is_mx35()) {
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+ priv->ahbclk = clk_get(dev, "usb_ahb");
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+ if (IS_ERR(priv->ahbclk)) {
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+ ret = PTR_ERR(priv->ahbclk);
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+ goto err_clk_ahb;
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+ }
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+ clk_enable(priv->ahbclk);
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+ }
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+
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+ /* set USBMODE to host mode */
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+ temp = readl(hcd->regs + USBMODE_OFFSET);
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+ writel(temp | USBMODE_CM_HOST, hcd->regs + USBMODE_OFFSET);
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+
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+ /* set up the PORTSCx register */
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+ writel(pdata->portsc, hcd->regs + PORTSC_OFFSET);
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+ mdelay(10);
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+
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+ /* setup USBCONTROL. */
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+ ret = mxc_set_usbcontrol(pdev->id, pdata->flags);
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+ if (ret < 0)
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+ goto err_init;
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+
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+ /* call platform specific init function */
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+ if (pdata->init) {
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+ ret = pdata->init(pdev);
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+ if (ret) {
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+ dev_err(dev, "platform init failed\n");
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+ goto err_init;
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+ }
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+ }
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+
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+ /* most platforms need some time to settle changed IO settings */
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+ mdelay(10);
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+
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+ /* Initialize the transceiver */
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+ if (pdata->otg) {
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+ pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
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+ if (otg_init(pdata->otg) != 0)
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+ dev_err(dev, "unable to init transceiver\n");
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+ else if (otg_set_vbus(pdata->otg, 1) != 0)
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+ dev_err(dev, "unable to enable vbus on transceiver\n");
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+ }
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+
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+ priv->hcd = hcd;
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+ platform_set_drvdata(pdev, priv);
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+
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+ ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
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+ if (ret)
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+ goto err_add;
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+
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+ return 0;
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+
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+err_add:
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+ if (pdata && pdata->exit)
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+ pdata->exit(pdev);
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+err_init:
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+ if (priv->ahbclk) {
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+ clk_disable(priv->ahbclk);
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+ clk_put(priv->ahbclk);
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+ }
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+err_clk_ahb:
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+ clk_disable(priv->usbclk);
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+ clk_put(priv->usbclk);
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+err_clk:
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+ iounmap(hcd->regs);
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+err_ioremap:
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+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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+err_request_mem:
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+err_get_resource:
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+ kfree(priv);
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+err_alloc:
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+ usb_put_hcd(hcd);
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+ return ret;
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+}
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+
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+static int __exit ehci_mxc_drv_remove(struct platform_device *pdev)
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+{
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+ struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data;
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+ struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
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+ struct usb_hcd *hcd = priv->hcd;
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+
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+ if (pdata && pdata->exit)
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+ pdata->exit(pdev);
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+
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+ if (pdata->otg)
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+ otg_shutdown(pdata->otg);
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+
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+ usb_remove_hcd(hcd);
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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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+ platform_set_drvdata(pdev, NULL);
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+
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+ clk_disable(priv->usbclk);
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+ clk_put(priv->usbclk);
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+ if (priv->ahbclk) {
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+ clk_disable(priv->ahbclk);
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+ clk_put(priv->ahbclk);
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+ }
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+
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+ kfree(priv);
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+
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+ return 0;
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+}
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+
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+static void ehci_mxc_drv_shutdown(struct platform_device *pdev)
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+{
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+ struct ehci_mxc_priv *priv = platform_get_drvdata(pdev);
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+ struct usb_hcd *hcd = priv->hcd;
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+
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+ if (hcd->driver->shutdown)
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+ hcd->driver->shutdown(hcd);
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+}
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+
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+MODULE_ALIAS("platform:mxc-ehci");
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+
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+static struct platform_driver ehci_mxc_driver = {
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+ .probe = ehci_mxc_drv_probe,
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+ .remove = __exit_p(ehci_mxc_drv_remove),
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+ .shutdown = ehci_mxc_drv_shutdown,
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+ .driver = {
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+ .name = "mxc-ehci",
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+ },
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+};
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