449 lines
11 KiB
C
449 lines
11 KiB
C
/*
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* Generic platform ehci driver
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*
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* Copyright 2007 Steven Brown <sbrown@cortland.com>
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* Copyright 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
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* Copyright 2014 Hans de Goede <hdegoede@redhat.com>
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*
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* Derived from the ohci-ssb driver
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* Copyright 2007 Michael Buesch <m@bues.ch>
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*
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* Derived from the EHCI-PCI driver
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* Copyright (c) 2000-2004 by David Brownell
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*
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* Derived from the ohci-pci driver
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* Copyright 1999 Roman Weissgaerber
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* Copyright 2000-2002 David Brownell
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* Copyright 1999 Linus Torvalds
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* Copyright 1999 Gregory P. Smith
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*
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* Licensed under the GNU/GPL. See COPYING for details.
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*/
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#include <linux/acpi.h>
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/hrtimer.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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#include <linux/reset.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include <linux/usb/ehci_pdriver.h>
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#include "ehci.h"
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#define DRIVER_DESC "EHCI generic platform driver"
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#define EHCI_MAX_CLKS 4
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#define EHCI_MAX_RSTS 4
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#define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
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struct ehci_platform_priv {
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struct clk *clks[EHCI_MAX_CLKS];
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struct reset_control *rsts[EHCI_MAX_RSTS];
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struct phy **phys;
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int num_phys;
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bool reset_on_resume;
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};
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static const char hcd_name[] = "ehci-platform";
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static int ehci_platform_reset(struct usb_hcd *hcd)
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{
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struct platform_device *pdev = to_platform_device(hcd->self.controller);
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struct usb_ehci_pdata *pdata = dev_get_platdata(&pdev->dev);
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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int retval;
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ehci->has_synopsys_hc_bug = pdata->has_synopsys_hc_bug;
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if (pdata->pre_setup) {
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retval = pdata->pre_setup(hcd);
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if (retval < 0)
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return retval;
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}
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ehci->caps = hcd->regs + pdata->caps_offset;
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retval = ehci_setup(hcd);
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if (retval)
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return retval;
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if (pdata->no_io_watchdog)
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ehci->need_io_watchdog = 0;
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return 0;
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}
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static int ehci_platform_power_on(struct platform_device *dev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(dev);
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struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
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int clk, ret, phy_num;
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for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++) {
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ret = clk_prepare_enable(priv->clks[clk]);
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if (ret)
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goto err_disable_clks;
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}
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for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
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ret = phy_init(priv->phys[phy_num]);
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if (ret)
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goto err_exit_phy;
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ret = phy_power_on(priv->phys[phy_num]);
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if (ret) {
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phy_exit(priv->phys[phy_num]);
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goto err_exit_phy;
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}
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}
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return 0;
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err_exit_phy:
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while (--phy_num >= 0) {
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phy_power_off(priv->phys[phy_num]);
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phy_exit(priv->phys[phy_num]);
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}
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err_disable_clks:
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while (--clk >= 0)
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clk_disable_unprepare(priv->clks[clk]);
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return ret;
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}
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static void ehci_platform_power_off(struct platform_device *dev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(dev);
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struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
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int clk, phy_num;
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for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
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phy_power_off(priv->phys[phy_num]);
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phy_exit(priv->phys[phy_num]);
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}
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for (clk = EHCI_MAX_CLKS - 1; clk >= 0; clk--)
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if (priv->clks[clk])
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clk_disable_unprepare(priv->clks[clk]);
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}
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static struct hc_driver __read_mostly ehci_platform_hc_driver;
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static const struct ehci_driver_overrides platform_overrides __initconst = {
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.reset = ehci_platform_reset,
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.extra_priv_size = sizeof(struct ehci_platform_priv),
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};
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static struct usb_ehci_pdata ehci_platform_defaults = {
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.power_on = ehci_platform_power_on,
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.power_suspend = ehci_platform_power_off,
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.power_off = ehci_platform_power_off,
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};
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static int ehci_platform_probe(struct platform_device *dev)
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{
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struct usb_hcd *hcd;
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struct resource *res_mem;
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struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
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struct ehci_platform_priv *priv;
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struct ehci_hcd *ehci;
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int err, irq, phy_num, clk = 0, rst;
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if (usb_disabled())
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return -ENODEV;
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/*
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* Use reasonable defaults so platforms don't have to provide these
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* with DT probing on ARM.
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*/
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if (!pdata)
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pdata = &ehci_platform_defaults;
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err = dma_coerce_mask_and_coherent(&dev->dev,
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pdata->dma_mask_64 ? DMA_BIT_MASK(64) : DMA_BIT_MASK(32));
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if (err) {
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dev_err(&dev->dev, "Error: DMA mask configuration failed\n");
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return err;
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}
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irq = platform_get_irq(dev, 0);
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if (irq < 0) {
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dev_err(&dev->dev, "no irq provided");
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return irq;
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}
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hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
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dev_name(&dev->dev));
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if (!hcd)
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return -ENOMEM;
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platform_set_drvdata(dev, hcd);
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dev->dev.platform_data = pdata;
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priv = hcd_to_ehci_priv(hcd);
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ehci = hcd_to_ehci(hcd);
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if (pdata == &ehci_platform_defaults && dev->dev.of_node) {
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if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
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ehci->big_endian_mmio = 1;
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if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
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ehci->big_endian_desc = 1;
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if (of_property_read_bool(dev->dev.of_node, "big-endian"))
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ehci->big_endian_mmio = ehci->big_endian_desc = 1;
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if (of_property_read_bool(dev->dev.of_node,
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"needs-reset-on-resume"))
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priv->reset_on_resume = true;
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if (of_property_read_bool(dev->dev.of_node,
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"has-transaction-translator"))
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hcd->has_tt = 1;
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priv->num_phys = of_count_phandle_with_args(dev->dev.of_node,
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"phys", "#phy-cells");
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if (priv->num_phys > 0) {
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priv->phys = devm_kcalloc(&dev->dev, priv->num_phys,
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sizeof(struct phy *), GFP_KERNEL);
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if (!priv->phys)
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return -ENOMEM;
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} else
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priv->num_phys = 0;
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for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
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priv->phys[phy_num] = devm_of_phy_get_by_index(
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&dev->dev, dev->dev.of_node, phy_num);
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if (IS_ERR(priv->phys[phy_num])) {
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err = PTR_ERR(priv->phys[phy_num]);
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goto err_put_hcd;
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}
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}
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for (clk = 0; clk < EHCI_MAX_CLKS; clk++) {
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priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
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if (IS_ERR(priv->clks[clk])) {
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err = PTR_ERR(priv->clks[clk]);
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if (err == -EPROBE_DEFER)
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goto err_put_clks;
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priv->clks[clk] = NULL;
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break;
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}
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}
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}
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for (rst = 0; rst < EHCI_MAX_RSTS; rst++) {
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priv->rsts[rst] = devm_reset_control_get_shared_by_index(
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&dev->dev, rst);
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if (IS_ERR(priv->rsts[rst])) {
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err = PTR_ERR(priv->rsts[rst]);
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if (err == -EPROBE_DEFER)
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goto err_reset;
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priv->rsts[rst] = NULL;
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break;
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}
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err = reset_control_deassert(priv->rsts[rst]);
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if (err)
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goto err_reset;
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}
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if (pdata->big_endian_desc)
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ehci->big_endian_desc = 1;
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if (pdata->big_endian_mmio)
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ehci->big_endian_mmio = 1;
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if (pdata->has_tt)
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hcd->has_tt = 1;
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if (pdata->reset_on_resume)
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priv->reset_on_resume = true;
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#ifndef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
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if (ehci->big_endian_mmio) {
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dev_err(&dev->dev,
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"Error: CONFIG_USB_EHCI_BIG_ENDIAN_MMIO not set\n");
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err = -EINVAL;
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goto err_reset;
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}
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#endif
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#ifndef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
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if (ehci->big_endian_desc) {
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dev_err(&dev->dev,
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"Error: CONFIG_USB_EHCI_BIG_ENDIAN_DESC not set\n");
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err = -EINVAL;
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goto err_reset;
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}
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#endif
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if (pdata->power_on) {
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err = pdata->power_on(dev);
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if (err < 0)
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goto err_reset;
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}
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res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
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hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
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if (IS_ERR(hcd->regs)) {
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err = PTR_ERR(hcd->regs);
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goto err_power;
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}
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hcd->rsrc_start = res_mem->start;
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hcd->rsrc_len = resource_size(res_mem);
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err = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (err)
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goto err_power;
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device_wakeup_enable(hcd->self.controller);
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platform_set_drvdata(dev, hcd);
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return err;
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err_power:
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if (pdata->power_off)
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pdata->power_off(dev);
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err_reset:
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while (--rst >= 0)
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reset_control_assert(priv->rsts[rst]);
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err_put_clks:
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while (--clk >= 0)
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clk_put(priv->clks[clk]);
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err_put_hcd:
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if (pdata == &ehci_platform_defaults)
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dev->dev.platform_data = NULL;
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usb_put_hcd(hcd);
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return err;
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}
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static int ehci_platform_remove(struct platform_device *dev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(dev);
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struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
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struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
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int clk, rst;
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usb_remove_hcd(hcd);
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if (pdata->power_off)
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pdata->power_off(dev);
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for (rst = 0; rst < EHCI_MAX_RSTS && priv->rsts[rst]; rst++)
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reset_control_assert(priv->rsts[rst]);
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for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
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clk_put(priv->clks[clk]);
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usb_put_hcd(hcd);
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if (pdata == &ehci_platform_defaults)
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dev->dev.platform_data = NULL;
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int ehci_platform_suspend(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
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struct platform_device *pdev = to_platform_device(dev);
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bool do_wakeup = device_may_wakeup(dev);
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int ret;
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ret = ehci_suspend(hcd, do_wakeup);
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if (ret)
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return ret;
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if (pdata->power_suspend)
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pdata->power_suspend(pdev);
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return ret;
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}
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static int ehci_platform_resume(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
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struct platform_device *pdev = to_platform_device(dev);
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struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
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if (pdata->power_on) {
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int err = pdata->power_on(pdev);
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if (err < 0)
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return err;
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}
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ehci_resume(hcd, priv->reset_on_resume);
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pm_runtime_disable(dev);
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pm_runtime_set_active(dev);
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pm_runtime_enable(dev);
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return 0;
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}
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#endif /* CONFIG_PM_SLEEP */
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static const struct of_device_id vt8500_ehci_ids[] = {
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{ .compatible = "via,vt8500-ehci", },
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{ .compatible = "wm,prizm-ehci", },
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{ .compatible = "generic-ehci", },
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{ .compatible = "cavium,octeon-6335-ehci", },
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{}
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};
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MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);
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static const struct acpi_device_id ehci_acpi_match[] = {
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{ "PNP0D20", 0 }, /* EHCI controller without debug */
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, ehci_acpi_match);
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static const struct platform_device_id ehci_platform_table[] = {
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{ "ehci-platform", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(platform, ehci_platform_table);
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static SIMPLE_DEV_PM_OPS(ehci_platform_pm_ops, ehci_platform_suspend,
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ehci_platform_resume);
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static struct platform_driver ehci_platform_driver = {
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.id_table = ehci_platform_table,
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.probe = ehci_platform_probe,
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.remove = ehci_platform_remove,
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.shutdown = usb_hcd_platform_shutdown,
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.driver = {
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.name = "ehci-platform",
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.pm = &ehci_platform_pm_ops,
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.of_match_table = vt8500_ehci_ids,
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.acpi_match_table = ACPI_PTR(ehci_acpi_match),
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}
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};
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static int __init ehci_platform_init(void)
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{
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if (usb_disabled())
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return -ENODEV;
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pr_info("%s: " DRIVER_DESC "\n", hcd_name);
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ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
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return platform_driver_register(&ehci_platform_driver);
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}
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module_init(ehci_platform_init);
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static void __exit ehci_platform_cleanup(void)
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{
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platform_driver_unregister(&ehci_platform_driver);
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}
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module_exit(ehci_platform_cleanup);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_AUTHOR("Hauke Mehrtens");
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MODULE_AUTHOR("Alan Stern");
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MODULE_LICENSE("GPL");
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