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319 lines
7.4 KiB
319 lines
7.4 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Copyright (C) 2011 Marvell International Ltd. All rights reserved. |
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* Author: Chao Xie <[email protected]> |
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* Neil Zhang <[email protected]> |
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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/usb/of.h> |
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#include <linux/platform_data/mv_usb.h> |
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#include <linux/io.h> |
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#include <linux/usb/hcd.h> |
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#include "ehci.h" |
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/* registers */ |
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#define U2x_CAPREGS_OFFSET 0x100 |
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#define CAPLENGTH_MASK (0xff) |
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#define hcd_to_ehci_hcd_mv(h) ((struct ehci_hcd_mv *)hcd_to_ehci(h)->priv) |
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struct ehci_hcd_mv { |
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/* Which mode does this ehci running OTG/Host ? */ |
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int mode; |
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void __iomem *base; |
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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 clk *clk; |
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struct phy *phy; |
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int (*set_vbus)(unsigned int vbus); |
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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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ehci_clock_enable(ehci_mv); |
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return phy_init(ehci_mv->phy); |
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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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phy_exit(ehci_mv->phy); |
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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 = hcd_to_ehci_hcd_mv(hcd); |
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struct ehci_hcd *ehci = hcd_to_ehci(hcd); |
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u32 status; |
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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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if (of_usb_get_phy_mode(dev->of_node) == USBPHY_INTERFACE_MODE_HSIC) { |
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status = ehci_readl(ehci, &ehci->regs->port_status[0]); |
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status |= PORT_TEST_FORCE; |
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ehci_writel(ehci, status, &ehci->regs->port_status[0]); |
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status &= ~PORT_TEST_FORCE; |
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ehci_writel(ehci, status, &ehci->regs->port_status[0]); |
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} |
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return retval; |
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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 = mv_ehci_reset, |
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.extra_priv_size = sizeof(struct ehci_hcd_mv), |
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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; |
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u32 offset; |
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u32 status; |
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if (usb_disabled()) |
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return -ENODEV; |
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hcd = usb_create_hcd(&ehci_platform_hc_driver, &pdev->dev, dev_name(&pdev->dev)); |
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if (!hcd) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, hcd); |
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ehci_mv = hcd_to_ehci_hcd_mv(hcd); |
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ehci_mv->mode = MV_USB_MODE_HOST; |
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if (pdata) { |
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ehci_mv->mode = pdata->mode; |
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ehci_mv->set_vbus = pdata->set_vbus; |
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} |
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ehci_mv->phy = devm_phy_optional_get(&pdev->dev, "usb"); |
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if (IS_ERR(ehci_mv->phy)) { |
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retval = PTR_ERR(ehci_mv->phy); |
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if (retval != -EPROBE_DEFER) |
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dev_err(&pdev->dev, "Failed to get phy.\n"); |
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goto err_put_hcd; |
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} |
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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(pdev, IORESOURCE_MEM, 0); |
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ehci_mv->base = devm_ioremap_resource(&pdev->dev, r); |
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if (IS_ERR(ehci_mv->base)) { |
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retval = PTR_ERR(ehci_mv->base); |
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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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ehci_mv->cap_regs = |
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(void __iomem *) ((unsigned long) ehci_mv->base + U2x_CAPREGS_OFFSET); |
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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 __iomem *) ehci_mv->cap_regs; |
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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 (ehci_mv->set_vbus) |
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ehci_mv->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 (of_usb_get_phy_mode(pdev->dev.of_node) == USBPHY_INTERFACE_MODE_HSIC) { |
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status = ehci_readl(ehci, &ehci->regs->port_status[0]); |
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/* These "reserved" bits actually enable HSIC mode. */ |
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status |= BIT(25); |
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status &= ~GENMASK(31, 30); |
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ehci_writel(ehci, status, &ehci->regs->port_status[0]); |
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} |
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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 (ehci_mv->set_vbus) |
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ehci_mv->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 usb_hcd *hcd = platform_get_drvdata(pdev); |
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struct ehci_hcd_mv *ehci_mv = hcd_to_ehci_hcd_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->set_vbus) |
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ehci_mv->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", 0}, |
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{"pxa-sph", 0}, |
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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 usb_hcd *hcd = platform_get_drvdata(pdev); |
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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 const struct of_device_id ehci_mv_dt_ids[] = { |
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{ .compatible = "marvell,pxau2o-ehci", }, |
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{}, |
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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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.of_match_table = ehci_mv_dt_ids, |
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}, |
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.id_table = ehci_id_table, |
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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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ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides); |
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return platform_driver_register(&ehci_mv_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_mv_driver); |
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} |
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module_exit(ehci_platform_cleanup); |
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MODULE_DESCRIPTION("Marvell EHCI driver"); |
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MODULE_AUTHOR("Chao Xie <[email protected]>"); |
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MODULE_AUTHOR("Neil Zhang <[email protected]>"); |
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MODULE_ALIAS("mv-ehci"); |
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MODULE_LICENSE("GPL"); |
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MODULE_DEVICE_TABLE(of, ehci_mv_dt_ids);
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