1a49e2ac96
This patch (as1564c) converts the EHCI platform drivers to use the central ehci_setup() routine for generic controller initialization rather than each having its own idiosyncratic approach. The major point of difficulty lies in ehci-pci's many vendor- and device-specific workarounds. Some of them have to be applied before calling ehci_setup() and some after, which necessitates a fair amount of code motion. The other platform drivers require much smaller changes. One point not addressed by the patch is whether ports should be powered on or off following initialization. The different drivers appear to handle this pretty much at random. In fact it shouldn't matter, because the hub driver turns on power to all ports when it binds to the root hub. Straightening that out will be left for another day. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
377 lines
8.4 KiB
C
377 lines
8.4 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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/* clock source and total clock number */
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unsigned int clknum;
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struct clk *clk[0];
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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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unsigned int i;
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for (i = 0; i < ehci_mv->clknum; i++)
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clk_enable(ehci_mv->clk[i]);
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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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unsigned int i;
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for (i = 0; i < ehci_mv->clknum; i++)
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clk_disable(ehci_mv->clk[i]);
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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,
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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 = pdev->dev.platform_data;
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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 clk_i, retval = -ENODEV;
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u32 offset;
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size_t size;
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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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size = sizeof(*ehci_mv) + sizeof(struct clk *) * pdata->clknum;
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ehci_mv = kzalloc(size, GFP_KERNEL);
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if (ehci_mv == NULL) {
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dev_err(&pdev->dev, "cannot allocate ehci_hcd_mv\n");
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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->clknum = pdata->clknum;
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for (clk_i = 0; clk_i < ehci_mv->clknum; clk_i++) {
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ehci_mv->clk[clk_i] =
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clk_get(&pdev->dev, pdata->clkname[clk_i]);
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if (IS_ERR(ehci_mv->clk[clk_i])) {
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dev_err(&pdev->dev, "error get clck \"%s\"\n",
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pdata->clkname[clk_i]);
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retval = PTR_ERR(ehci_mv->clk[clk_i]);
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goto err_put_clk;
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}
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}
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r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phyregs");
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if (r == NULL) {
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dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
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retval = -ENODEV;
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goto err_put_clk;
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}
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ehci_mv->phy_regs = ioremap(r->start, resource_size(r));
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if (ehci_mv->phy_regs == 0) {
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dev_err(&pdev->dev, "failed to map phy I/O memory\n");
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retval = -EFAULT;
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goto err_put_clk;
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}
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r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "capregs");
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if (!r) {
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dev_err(&pdev->dev, "no I/O memory resource defined\n");
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retval = -ENODEV;
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goto err_iounmap_phyreg;
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}
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ehci_mv->cap_regs = ioremap(r->start, resource_size(r));
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if (ehci_mv->cap_regs == NULL) {
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dev_err(&pdev->dev, "failed to map I/O memory\n");
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retval = -EFAULT;
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goto err_iounmap_phyreg;
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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_iounmap_capreg;
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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 = r->end - r->start + 1;
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hcd->regs = ehci_mv->op_regs;
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hcd->irq = platform_get_irq(pdev, 0);
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if (!hcd->irq) {
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dev_err(&pdev->dev, "Cannot get irq.");
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retval = -ENODEV;
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goto err_disable_clk;
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}
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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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#ifdef CONFIG_USB_OTG_UTILS
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ehci_mv->otg = usb_get_phy(USB_PHY_TYPE_USB2);
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if (IS_ERR_OR_NULL(ehci_mv->otg)) {
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dev_err(&pdev->dev,
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"unable to find transceiver\n");
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retval = -ENODEV;
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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_put_transceiver;
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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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dev_info(&pdev->dev, "MV_USB_MODE_OTG "
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"must have CONFIG_USB_OTG_UTILS enabled\n");
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goto err_disable_clk;
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#endif
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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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}
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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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#ifdef CONFIG_USB_OTG_UTILS
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err_put_transceiver:
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if (!IS_ERR_OR_NULL(ehci_mv->otg))
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usb_put_phy(ehci_mv->otg);
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#endif
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err_disable_clk:
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mv_ehci_disable(ehci_mv);
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err_iounmap_capreg:
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iounmap(ehci_mv->cap_regs);
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err_iounmap_phyreg:
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iounmap(ehci_mv->phy_regs);
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err_put_clk:
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for (clk_i--; clk_i >= 0; clk_i--)
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clk_put(ehci_mv->clk[clk_i]);
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platform_set_drvdata(pdev, NULL);
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kfree(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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int clk_i;
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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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usb_put_phy(ehci_mv->otg);
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}
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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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iounmap(ehci_mv->cap_regs);
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iounmap(ehci_mv->phy_regs);
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for (clk_i = 0; clk_i < ehci_mv->clknum; clk_i++)
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clk_put(ehci_mv->clk[clk_i]);
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platform_set_drvdata(pdev, NULL);
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kfree(ehci_mv);
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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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