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210 lines
4.8 KiB
210 lines
4.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Nuvoton NPCM7xx driver for EHCI HCD |
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* |
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* Copyright (C) 2018 Nuvoton Technologies, |
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* Avi Fishman <[email protected]> <[email protected]> |
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* Tomer Maimon <[email protected]> <[email protected]> |
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* |
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* Based on various ehci-spear.c driver |
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*/ |
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#include <linux/dma-mapping.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm.h> |
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#include <linux/usb.h> |
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#include <linux/usb/hcd.h> |
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#include "ehci.h" |
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#include <linux/regmap.h> |
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#include <linux/mfd/syscon.h> |
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#define DRIVER_DESC "EHCI npcm7xx driver" |
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static const char hcd_name[] = "npcm7xx-ehci"; |
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#define USB2PHYCTL_OFFSET 0x144 |
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#define IPSRST2_OFFSET 0x24 |
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#define IPSRST3_OFFSET 0x34 |
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static struct hc_driver __read_mostly ehci_npcm7xx_hc_driver; |
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static int __maybe_unused ehci_npcm7xx_drv_suspend(struct device *dev) |
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{ |
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struct usb_hcd *hcd = dev_get_drvdata(dev); |
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bool do_wakeup = device_may_wakeup(dev); |
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return ehci_suspend(hcd, do_wakeup); |
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} |
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static int __maybe_unused ehci_npcm7xx_drv_resume(struct device *dev) |
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{ |
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struct usb_hcd *hcd = dev_get_drvdata(dev); |
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ehci_resume(hcd, false); |
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return 0; |
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} |
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static SIMPLE_DEV_PM_OPS(ehci_npcm7xx_pm_ops, ehci_npcm7xx_drv_suspend, |
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ehci_npcm7xx_drv_resume); |
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static int npcm7xx_ehci_hcd_drv_probe(struct platform_device *pdev) |
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{ |
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struct usb_hcd *hcd; |
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struct resource *res; |
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struct regmap *gcr_regmap; |
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struct regmap *rst_regmap; |
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const struct hc_driver *driver = &ehci_npcm7xx_hc_driver; |
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int irq; |
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int retval; |
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dev_dbg(&pdev->dev, "initializing npcm7xx ehci USB Controller\n"); |
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gcr_regmap = syscon_regmap_lookup_by_compatible("nuvoton,npcm750-gcr"); |
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if (IS_ERR(gcr_regmap)) { |
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dev_err(&pdev->dev, "%s: failed to find nuvoton,npcm750-gcr\n", |
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__func__); |
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return PTR_ERR(gcr_regmap); |
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} |
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rst_regmap = syscon_regmap_lookup_by_compatible("nuvoton,npcm750-rst"); |
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if (IS_ERR(rst_regmap)) { |
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dev_err(&pdev->dev, "%s: failed to find nuvoton,npcm750-rst\n", |
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__func__); |
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return PTR_ERR(rst_regmap); |
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} |
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/********* phy init ******/ |
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// reset usb host |
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regmap_update_bits(rst_regmap, IPSRST2_OFFSET, |
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(0x1 << 26), (0x1 << 26)); |
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regmap_update_bits(rst_regmap, IPSRST3_OFFSET, |
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(0x1 << 25), (0x1 << 25)); |
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regmap_update_bits(gcr_regmap, USB2PHYCTL_OFFSET, |
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(0x1 << 28), 0); |
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udelay(1); |
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// enable phy |
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regmap_update_bits(rst_regmap, IPSRST3_OFFSET, |
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(0x1 << 25), 0); |
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udelay(50); // enable phy |
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regmap_update_bits(gcr_regmap, USB2PHYCTL_OFFSET, |
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(0x1 << 28), (0x1 << 28)); |
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// enable host |
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regmap_update_bits(rst_regmap, IPSRST2_OFFSET, |
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(0x1 << 26), 0); |
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if (usb_disabled()) |
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return -ENODEV; |
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irq = platform_get_irq(pdev, 0); |
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if (irq < 0) { |
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retval = irq; |
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goto fail; |
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} |
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/* |
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* Right now device-tree probed devices don't get dma_mask set. |
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* Since shared usb code relies on it, set it here for now. |
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* Once we have dma capability bindings this can go away. |
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*/ |
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retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); |
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if (retval) |
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goto fail; |
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hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); |
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if (!hcd) { |
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retval = -ENOMEM; |
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goto fail; |
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} |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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hcd->regs = devm_ioremap_resource(&pdev->dev, res); |
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if (IS_ERR(hcd->regs)) { |
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retval = PTR_ERR(hcd->regs); |
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goto err_put_hcd; |
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} |
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hcd->rsrc_start = res->start; |
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hcd->rsrc_len = resource_size(res); |
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/* registers start at offset 0x0 */ |
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hcd_to_ehci(hcd)->caps = hcd->regs; |
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retval = usb_add_hcd(hcd, irq, IRQF_SHARED); |
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if (retval) |
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goto err_put_hcd; |
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device_wakeup_enable(hcd->self.controller); |
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return retval; |
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err_put_hcd: |
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usb_put_hcd(hcd); |
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fail: |
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dev_err(&pdev->dev, "init fail, %d\n", retval); |
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return retval; |
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} |
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static int npcm7xx_ehci_hcd_drv_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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usb_remove_hcd(hcd); |
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usb_put_hcd(hcd); |
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return 0; |
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} |
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static const struct of_device_id npcm7xx_ehci_id_table[] = { |
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{ .compatible = "nuvoton,npcm750-ehci" }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, npcm7xx_ehci_id_table); |
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static struct platform_driver npcm7xx_ehci_hcd_driver = { |
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.probe = npcm7xx_ehci_hcd_drv_probe, |
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.remove = npcm7xx_ehci_hcd_drv_remove, |
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.shutdown = usb_hcd_platform_shutdown, |
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.driver = { |
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.name = "npcm7xx-ehci", |
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.bus = &platform_bus_type, |
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.pm = pm_ptr(&ehci_npcm7xx_pm_ops), |
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.of_match_table = npcm7xx_ehci_id_table, |
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} |
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}; |
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static int __init ehci_npcm7xx_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_npcm7xx_hc_driver, NULL); |
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return platform_driver_register(&npcm7xx_ehci_hcd_driver); |
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} |
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module_init(ehci_npcm7xx_init); |
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static void __exit ehci_npcm7xx_cleanup(void) |
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{ |
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platform_driver_unregister(&npcm7xx_ehci_hcd_driver); |
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} |
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module_exit(ehci_npcm7xx_cleanup); |
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MODULE_DESCRIPTION(DRIVER_DESC); |
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MODULE_ALIAS("platform:npcm7xx-ehci"); |
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MODULE_AUTHOR("Avi Fishman"); |
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MODULE_LICENSE("GPL v2");
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