320 lines
7.1 KiB
C
320 lines
7.1 KiB
C
/*
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* Copyright (C) 2011 Marvell International Ltd. All rights reserved.
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* Author: Chao Xie <chao.xie@marvell.com>
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* Neil Zhang <zhangwm@marvell.com>
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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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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/usb/otg.h>
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#include <linux/platform_data/mv_usb.h>
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#define CAPLENGTH_MASK (0xff)
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struct ehci_hcd_mv {
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struct usb_hcd *hcd;
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/* Which mode does this ehci running OTG/Host ? */
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int mode;
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void __iomem *phy_regs;
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void __iomem *cap_regs;
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void __iomem *op_regs;
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struct usb_phy *otg;
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struct mv_usb_platform_data *pdata;
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struct clk *clk;
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};
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static void ehci_clock_enable(struct ehci_hcd_mv *ehci_mv)
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{
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clk_prepare_enable(ehci_mv->clk);
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}
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static void ehci_clock_disable(struct ehci_hcd_mv *ehci_mv)
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{
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clk_disable_unprepare(ehci_mv->clk);
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}
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static int mv_ehci_enable(struct ehci_hcd_mv *ehci_mv)
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{
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int retval;
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ehci_clock_enable(ehci_mv);
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if (ehci_mv->pdata->phy_init) {
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retval = ehci_mv->pdata->phy_init(ehci_mv->phy_regs);
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if (retval)
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return retval;
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}
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return 0;
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}
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static void mv_ehci_disable(struct ehci_hcd_mv *ehci_mv)
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{
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if (ehci_mv->pdata->phy_deinit)
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ehci_mv->pdata->phy_deinit(ehci_mv->phy_regs);
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ehci_clock_disable(ehci_mv);
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}
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static int mv_ehci_reset(struct usb_hcd *hcd)
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{
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struct device *dev = hcd->self.controller;
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struct ehci_hcd_mv *ehci_mv = dev_get_drvdata(dev);
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int retval;
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if (ehci_mv == NULL) {
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dev_err(dev, "Can not find private ehci data\n");
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return -ENODEV;
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}
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hcd->has_tt = 1;
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retval = ehci_setup(hcd);
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if (retval)
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dev_err(dev, "ehci_setup failed %d\n", retval);
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return retval;
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}
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static const struct hc_driver mv_ehci_hc_driver = {
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.description = hcd_name,
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.product_desc = "Marvell EHCI",
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.hcd_priv_size = sizeof(struct ehci_hcd),
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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_MEMORY | HCD_USB2 | HCD_BH,
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/*
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* basic lifecycle operations
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*/
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.reset = mv_ehci_reset,
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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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* 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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.endpoint_reset = ehci_endpoint_reset,
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.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
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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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* 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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};
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static int mv_ehci_probe(struct platform_device *pdev)
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{
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struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
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struct usb_hcd *hcd;
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struct ehci_hcd *ehci;
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struct ehci_hcd_mv *ehci_mv;
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struct resource *r;
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int retval = -ENODEV;
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u32 offset;
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if (!pdata) {
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dev_err(&pdev->dev, "missing platform_data\n");
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return -ENODEV;
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}
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if (usb_disabled())
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return -ENODEV;
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hcd = usb_create_hcd(&mv_ehci_hc_driver, &pdev->dev, "mv ehci");
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if (!hcd)
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return -ENOMEM;
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ehci_mv = devm_kzalloc(&pdev->dev, sizeof(*ehci_mv), GFP_KERNEL);
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if (ehci_mv == NULL) {
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retval = -ENOMEM;
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goto err_put_hcd;
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}
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platform_set_drvdata(pdev, ehci_mv);
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ehci_mv->pdata = pdata;
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ehci_mv->hcd = hcd;
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ehci_mv->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(ehci_mv->clk)) {
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dev_err(&pdev->dev, "error getting clock\n");
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retval = PTR_ERR(ehci_mv->clk);
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goto err_put_hcd;
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}
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r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phyregs");
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ehci_mv->phy_regs = devm_ioremap_resource(&pdev->dev, r);
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if (IS_ERR(ehci_mv->phy_regs)) {
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retval = PTR_ERR(ehci_mv->phy_regs);
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goto err_put_hcd;
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}
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r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "capregs");
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ehci_mv->cap_regs = devm_ioremap_resource(&pdev->dev, r);
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if (IS_ERR(ehci_mv->cap_regs)) {
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retval = PTR_ERR(ehci_mv->cap_regs);
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goto err_put_hcd;
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}
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retval = mv_ehci_enable(ehci_mv);
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if (retval) {
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dev_err(&pdev->dev, "init phy error %d\n", retval);
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goto err_put_hcd;
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}
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offset = readl(ehci_mv->cap_regs) & CAPLENGTH_MASK;
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ehci_mv->op_regs =
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(void __iomem *) ((unsigned long) ehci_mv->cap_regs + offset);
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hcd->rsrc_start = r->start;
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hcd->rsrc_len = resource_size(r);
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hcd->regs = ehci_mv->op_regs;
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retval = platform_get_irq(pdev, 0);
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if (retval < 0)
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goto err_disable_clk;
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hcd->irq = retval;
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ehci = hcd_to_ehci(hcd);
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ehci->caps = (struct ehci_caps *) ehci_mv->cap_regs;
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ehci_mv->mode = pdata->mode;
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if (ehci_mv->mode == MV_USB_MODE_OTG) {
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ehci_mv->otg = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
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if (IS_ERR(ehci_mv->otg)) {
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retval = PTR_ERR(ehci_mv->otg);
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if (retval == -ENXIO)
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dev_info(&pdev->dev, "MV_USB_MODE_OTG "
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"must have CONFIG_USB_PHY enabled\n");
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else
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dev_err(&pdev->dev,
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"unable to find transceiver\n");
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goto err_disable_clk;
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}
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retval = otg_set_host(ehci_mv->otg->otg, &hcd->self);
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if (retval < 0) {
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dev_err(&pdev->dev,
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"unable to register with transceiver\n");
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retval = -ENODEV;
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goto err_disable_clk;
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}
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/* otg will enable clock before use as host */
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mv_ehci_disable(ehci_mv);
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} else {
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if (pdata->set_vbus)
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pdata->set_vbus(1);
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retval = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
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if (retval) {
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dev_err(&pdev->dev,
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"failed to add hcd with err %d\n", retval);
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goto err_set_vbus;
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}
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device_wakeup_enable(hcd->self.controller);
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}
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if (pdata->private_init)
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pdata->private_init(ehci_mv->op_regs, ehci_mv->phy_regs);
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dev_info(&pdev->dev,
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"successful find EHCI device with regs 0x%p irq %d"
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" working in %s mode\n", hcd->regs, hcd->irq,
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ehci_mv->mode == MV_USB_MODE_OTG ? "OTG" : "Host");
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return 0;
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err_set_vbus:
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if (pdata->set_vbus)
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pdata->set_vbus(0);
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err_disable_clk:
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mv_ehci_disable(ehci_mv);
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err_put_hcd:
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usb_put_hcd(hcd);
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return retval;
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}
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static int mv_ehci_remove(struct platform_device *pdev)
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{
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struct ehci_hcd_mv *ehci_mv = platform_get_drvdata(pdev);
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struct usb_hcd *hcd = ehci_mv->hcd;
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if (hcd->rh_registered)
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usb_remove_hcd(hcd);
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if (!IS_ERR_OR_NULL(ehci_mv->otg))
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otg_set_host(ehci_mv->otg->otg, NULL);
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if (ehci_mv->mode == MV_USB_MODE_HOST) {
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if (ehci_mv->pdata->set_vbus)
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ehci_mv->pdata->set_vbus(0);
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mv_ehci_disable(ehci_mv);
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}
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usb_put_hcd(hcd);
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return 0;
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}
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MODULE_ALIAS("mv-ehci");
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static const struct platform_device_id ehci_id_table[] = {
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{"pxa-u2oehci", PXA_U2OEHCI},
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{"pxa-sph", PXA_SPH},
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{"mmp3-hsic", MMP3_HSIC},
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{"mmp3-fsic", MMP3_FSIC},
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{},
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};
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static void mv_ehci_shutdown(struct platform_device *pdev)
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{
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struct ehci_hcd_mv *ehci_mv = platform_get_drvdata(pdev);
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struct usb_hcd *hcd = ehci_mv->hcd;
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if (!hcd->rh_registered)
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return;
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if (hcd->driver->shutdown)
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hcd->driver->shutdown(hcd);
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}
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static struct platform_driver ehci_mv_driver = {
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.probe = mv_ehci_probe,
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.remove = mv_ehci_remove,
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.shutdown = mv_ehci_shutdown,
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.driver = {
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.name = "mv-ehci",
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.bus = &platform_bus_type,
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},
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.id_table = ehci_id_table,
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};
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