1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Nuvoton NPCM7xx driver for EHCI HCD 4 * 5 * Copyright (C) 2018 Nuvoton Technologies, 6 * Avi Fishman <avi.fishman@nuvoton.com> <avifishman70@gmail.com> 7 * Tomer Maimon <tomer.maimon@nuvoton.com> <tmaimon77@gmail.com> 8 * 9 * Based on various ehci-spear.c driver 10 */ 11 12 13 #include <linux/dma-mapping.h> 14 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/of.h> 18 #include <linux/platform_device.h> 19 #include <linux/pm.h> 20 #include <linux/usb.h> 21 #include <linux/usb/hcd.h> 22 23 #include "ehci.h" 24 25 #define DRIVER_DESC "EHCI npcm7xx driver" 26 27 static struct hc_driver __read_mostly ehci_npcm7xx_hc_driver; 28 29 static int __maybe_unused ehci_npcm7xx_drv_suspend(struct device *dev) 30 { 31 struct usb_hcd *hcd = dev_get_drvdata(dev); 32 bool do_wakeup = device_may_wakeup(dev); 33 34 return ehci_suspend(hcd, do_wakeup); 35 } 36 37 static int __maybe_unused ehci_npcm7xx_drv_resume(struct device *dev) 38 { 39 struct usb_hcd *hcd = dev_get_drvdata(dev); 40 41 ehci_resume(hcd, false); 42 return 0; 43 } 44 45 static SIMPLE_DEV_PM_OPS(ehci_npcm7xx_pm_ops, ehci_npcm7xx_drv_suspend, 46 ehci_npcm7xx_drv_resume); 47 48 static int npcm7xx_ehci_hcd_drv_probe(struct platform_device *pdev) 49 { 50 struct usb_hcd *hcd; 51 struct resource *res; 52 const struct hc_driver *driver = &ehci_npcm7xx_hc_driver; 53 int irq; 54 int retval; 55 56 dev_dbg(&pdev->dev, "initializing npcm7xx ehci USB Controller\n"); 57 58 if (usb_disabled()) 59 return -ENODEV; 60 61 irq = platform_get_irq(pdev, 0); 62 if (irq < 0) { 63 retval = irq; 64 goto fail; 65 } 66 67 /* 68 * Right now device-tree probed devices don't get dma_mask set. 69 * Since shared usb code relies on it, set it here for now. 70 * Once we have dma capability bindings this can go away. 71 */ 72 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 73 if (retval) 74 goto fail; 75 76 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); 77 if (!hcd) { 78 retval = -ENOMEM; 79 goto fail; 80 } 81 82 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 83 hcd->regs = devm_ioremap_resource(&pdev->dev, res); 84 if (IS_ERR(hcd->regs)) { 85 retval = PTR_ERR(hcd->regs); 86 goto err_put_hcd; 87 } 88 hcd->rsrc_start = res->start; 89 hcd->rsrc_len = resource_size(res); 90 91 /* registers start at offset 0x0 */ 92 hcd_to_ehci(hcd)->caps = hcd->regs; 93 94 retval = usb_add_hcd(hcd, irq, IRQF_SHARED); 95 if (retval) 96 goto err_put_hcd; 97 98 device_wakeup_enable(hcd->self.controller); 99 return retval; 100 101 err_put_hcd: 102 usb_put_hcd(hcd); 103 fail: 104 dev_err(&pdev->dev, "init fail, %d\n", retval); 105 106 return retval; 107 } 108 109 static int npcm7xx_ehci_hcd_drv_remove(struct platform_device *pdev) 110 { 111 struct usb_hcd *hcd = platform_get_drvdata(pdev); 112 113 usb_remove_hcd(hcd); 114 115 usb_put_hcd(hcd); 116 117 return 0; 118 } 119 120 static const struct of_device_id npcm7xx_ehci_id_table[] = { 121 { .compatible = "nuvoton,npcm750-ehci" }, 122 { }, 123 }; 124 MODULE_DEVICE_TABLE(of, npcm7xx_ehci_id_table); 125 126 static struct platform_driver npcm7xx_ehci_hcd_driver = { 127 .probe = npcm7xx_ehci_hcd_drv_probe, 128 .remove = npcm7xx_ehci_hcd_drv_remove, 129 .shutdown = usb_hcd_platform_shutdown, 130 .driver = { 131 .name = "npcm7xx-ehci", 132 .bus = &platform_bus_type, 133 .pm = pm_ptr(&ehci_npcm7xx_pm_ops), 134 .of_match_table = npcm7xx_ehci_id_table, 135 } 136 }; 137 138 static int __init ehci_npcm7xx_init(void) 139 { 140 if (usb_disabled()) 141 return -ENODEV; 142 143 ehci_init_driver(&ehci_npcm7xx_hc_driver, NULL); 144 return platform_driver_register(&npcm7xx_ehci_hcd_driver); 145 } 146 module_init(ehci_npcm7xx_init); 147 148 static void __exit ehci_npcm7xx_cleanup(void) 149 { 150 platform_driver_unregister(&npcm7xx_ehci_hcd_driver); 151 } 152 module_exit(ehci_npcm7xx_cleanup); 153 154 MODULE_DESCRIPTION(DRIVER_DESC); 155 MODULE_ALIAS("platform:npcm7xx-ehci"); 156 MODULE_AUTHOR("Avi Fishman"); 157 MODULE_LICENSE("GPL v2"); 158