| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * Copyright (C) 2011 Marvell International Ltd. All rights reserved. |
| * Author: Chao Xie <chao.xie@marvell.com> |
| * Neil Zhang <zhangwm@marvell.com> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2 of the License, or (at your |
| * option) any later version. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/clk.h> |
| #include <linux/err.h> |
| #include <linux/usb/otg.h> |
| #include <linux/platform_data/mv_usb.h> |
| |
| #define CAPLENGTH_MASK (0xff) |
| |
| struct ehci_hcd_mv { |
| struct usb_hcd *hcd; |
| |
| /* Which mode does this ehci running OTG/Host ? */ |
| int mode; |
| |
| void __iomem *phy_regs; |
| void __iomem *cap_regs; |
| void __iomem *op_regs; |
| |
| struct usb_phy *otg; |
| |
| struct mv_usb_platform_data *pdata; |
| |
| struct clk *clk; |
| }; |
| |
| static void ehci_clock_enable(struct ehci_hcd_mv *ehci_mv) |
| { |
| clk_prepare_enable(ehci_mv->clk); |
| } |
| |
| static void ehci_clock_disable(struct ehci_hcd_mv *ehci_mv) |
| { |
| clk_disable_unprepare(ehci_mv->clk); |
| } |
| |
| static int mv_ehci_enable(struct ehci_hcd_mv *ehci_mv) |
| { |
| int retval; |
| |
| ehci_clock_enable(ehci_mv); |
| if (ehci_mv->pdata->phy_init) { |
| retval = ehci_mv->pdata->phy_init(ehci_mv->phy_regs); |
| if (retval) |
| return retval; |
| } |
| |
| return 0; |
| } |
| |
| static void mv_ehci_disable(struct ehci_hcd_mv *ehci_mv) |
| { |
| if (ehci_mv->pdata->phy_deinit) |
| ehci_mv->pdata->phy_deinit(ehci_mv->phy_regs); |
| ehci_clock_disable(ehci_mv); |
| } |
| |
| static int mv_ehci_reset(struct usb_hcd *hcd) |
| { |
| struct device *dev = hcd->self.controller; |
| struct ehci_hcd_mv *ehci_mv = dev_get_drvdata(dev); |
| int retval; |
| |
| if (ehci_mv == NULL) { |
| dev_err(dev, "Can not find private ehci data\n"); |
| return -ENODEV; |
| } |
| |
| hcd->has_tt = 1; |
| |
| retval = ehci_setup(hcd); |
| if (retval) |
| dev_err(dev, "ehci_setup failed %d\n", retval); |
| |
| return retval; |
| } |
| |
| static const struct hc_driver mv_ehci_hc_driver = { |
| .description = hcd_name, |
| .product_desc = "Marvell EHCI", |
| .hcd_priv_size = sizeof(struct ehci_hcd), |
| |
| /* |
| * generic hardware linkage |
| */ |
| .irq = ehci_irq, |
| .flags = HCD_MEMORY | HCD_USB2 | HCD_BH, |
| |
| /* |
| * basic lifecycle operations |
| */ |
| .reset = mv_ehci_reset, |
| .start = ehci_run, |
| .stop = ehci_stop, |
| .shutdown = ehci_shutdown, |
| |
| /* |
| * managing i/o requests and associated device resources |
| */ |
| .urb_enqueue = ehci_urb_enqueue, |
| .urb_dequeue = ehci_urb_dequeue, |
| .endpoint_disable = ehci_endpoint_disable, |
| .endpoint_reset = ehci_endpoint_reset, |
| .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, |
| |
| /* |
| * scheduling support |
| */ |
| .get_frame_number = ehci_get_frame, |
| |
| /* |
| * root hub support |
| */ |
| .hub_status_data = ehci_hub_status_data, |
| .hub_control = ehci_hub_control, |
| .bus_suspend = ehci_bus_suspend, |
| .bus_resume = ehci_bus_resume, |
| }; |
| |
| static int mv_ehci_probe(struct platform_device *pdev) |
| { |
| struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev); |
| struct usb_hcd *hcd; |
| struct ehci_hcd *ehci; |
| struct ehci_hcd_mv *ehci_mv; |
| struct resource *r; |
| int retval = -ENODEV; |
| u32 offset; |
| |
| if (!pdata) { |
| dev_err(&pdev->dev, "missing platform_data\n"); |
| return -ENODEV; |
| } |
| |
| if (usb_disabled()) |
| return -ENODEV; |
| |
| hcd = usb_create_hcd(&mv_ehci_hc_driver, &pdev->dev, "mv ehci"); |
| if (!hcd) |
| return -ENOMEM; |
| |
| ehci_mv = devm_kzalloc(&pdev->dev, sizeof(*ehci_mv), GFP_KERNEL); |
| if (ehci_mv == NULL) { |
| retval = -ENOMEM; |
| goto err_put_hcd; |
| } |
| |
| platform_set_drvdata(pdev, ehci_mv); |
| ehci_mv->pdata = pdata; |
| ehci_mv->hcd = hcd; |
| |
| ehci_mv->clk = devm_clk_get(&pdev->dev, NULL); |
| if (IS_ERR(ehci_mv->clk)) { |
| dev_err(&pdev->dev, "error getting clock\n"); |
| retval = PTR_ERR(ehci_mv->clk); |
| goto err_put_hcd; |
| } |
| |
| r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phyregs"); |
| ehci_mv->phy_regs = devm_ioremap_resource(&pdev->dev, r); |
| if (IS_ERR(ehci_mv->phy_regs)) { |
| retval = PTR_ERR(ehci_mv->phy_regs); |
| goto err_put_hcd; |
| } |
| |
| r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "capregs"); |
| ehci_mv->cap_regs = devm_ioremap_resource(&pdev->dev, r); |
| if (IS_ERR(ehci_mv->cap_regs)) { |
| retval = PTR_ERR(ehci_mv->cap_regs); |
| goto err_put_hcd; |
| } |
| |
| retval = mv_ehci_enable(ehci_mv); |
| if (retval) { |
| dev_err(&pdev->dev, "init phy error %d\n", retval); |
| goto err_put_hcd; |
| } |
| |
| offset = readl(ehci_mv->cap_regs) & CAPLENGTH_MASK; |
| ehci_mv->op_regs = |
| (void __iomem *) ((unsigned long) ehci_mv->cap_regs + offset); |
| |
| hcd->rsrc_start = r->start; |
| hcd->rsrc_len = resource_size(r); |
| hcd->regs = ehci_mv->op_regs; |
| |
| hcd->irq = platform_get_irq(pdev, 0); |
| if (!hcd->irq) { |
| dev_err(&pdev->dev, "Cannot get irq."); |
| retval = -ENODEV; |
| goto err_disable_clk; |
| } |
| |
| ehci = hcd_to_ehci(hcd); |
| ehci->caps = (struct ehci_caps *) ehci_mv->cap_regs; |
| |
| ehci_mv->mode = pdata->mode; |
| if (ehci_mv->mode == MV_USB_MODE_OTG) { |
| ehci_mv->otg = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2); |
| if (IS_ERR(ehci_mv->otg)) { |
| retval = PTR_ERR(ehci_mv->otg); |
| |
| if (retval == -ENXIO) |
| dev_info(&pdev->dev, "MV_USB_MODE_OTG " |
| "must have CONFIG_USB_PHY enabled\n"); |
| else |
| dev_err(&pdev->dev, |
| "unable to find transceiver\n"); |
| goto err_disable_clk; |
| } |
| |
| retval = otg_set_host(ehci_mv->otg->otg, &hcd->self); |
| if (retval < 0) { |
| dev_err(&pdev->dev, |
| "unable to register with transceiver\n"); |
| retval = -ENODEV; |
| goto err_disable_clk; |
| } |
| /* otg will enable clock before use as host */ |
| mv_ehci_disable(ehci_mv); |
| } else { |
| if (pdata->set_vbus) |
| pdata->set_vbus(1); |
| |
| retval = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED); |
| if (retval) { |
| dev_err(&pdev->dev, |
| "failed to add hcd with err %d\n", retval); |
| goto err_set_vbus; |
| } |
| device_wakeup_enable(hcd->self.controller); |
| } |
| |
| if (pdata->private_init) |
| pdata->private_init(ehci_mv->op_regs, ehci_mv->phy_regs); |
| |
| dev_info(&pdev->dev, |
| "successful find EHCI device with regs 0x%p irq %d" |
| " working in %s mode\n", hcd->regs, hcd->irq, |
| ehci_mv->mode == MV_USB_MODE_OTG ? "OTG" : "Host"); |
| |
| return 0; |
| |
| err_set_vbus: |
| if (pdata->set_vbus) |
| pdata->set_vbus(0); |
| err_disable_clk: |
| mv_ehci_disable(ehci_mv); |
| err_put_hcd: |
| usb_put_hcd(hcd); |
| |
| return retval; |
| } |
| |
| static int mv_ehci_remove(struct platform_device *pdev) |
| { |
| struct ehci_hcd_mv *ehci_mv = platform_get_drvdata(pdev); |
| struct usb_hcd *hcd = ehci_mv->hcd; |
| |
| if (hcd->rh_registered) |
| usb_remove_hcd(hcd); |
| |
| if (!IS_ERR_OR_NULL(ehci_mv->otg)) |
| otg_set_host(ehci_mv->otg->otg, NULL); |
| |
| if (ehci_mv->mode == MV_USB_MODE_HOST) { |
| if (ehci_mv->pdata->set_vbus) |
| ehci_mv->pdata->set_vbus(0); |
| |
| mv_ehci_disable(ehci_mv); |
| } |
| |
| usb_put_hcd(hcd); |
| |
| return 0; |
| } |
| |
| MODULE_ALIAS("mv-ehci"); |
| |
| static const struct platform_device_id ehci_id_table[] = { |
| {"pxa-u2oehci", PXA_U2OEHCI}, |
| {"pxa-sph", PXA_SPH}, |
| {"mmp3-hsic", MMP3_HSIC}, |
| {"mmp3-fsic", MMP3_FSIC}, |
| {}, |
| }; |
| |
| static void mv_ehci_shutdown(struct platform_device *pdev) |
| { |
| struct ehci_hcd_mv *ehci_mv = platform_get_drvdata(pdev); |
| struct usb_hcd *hcd = ehci_mv->hcd; |
| |
| if (!hcd->rh_registered) |
| return; |
| |
| if (hcd->driver->shutdown) |
| hcd->driver->shutdown(hcd); |
| } |
| |
| static struct platform_driver ehci_mv_driver = { |
| .probe = mv_ehci_probe, |
| .remove = mv_ehci_remove, |
| .shutdown = mv_ehci_shutdown, |
| .driver = { |
| .name = "mv-ehci", |
| .bus = &platform_bus_type, |
| }, |
| .id_table = ehci_id_table, |
| }; |