| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * linux/driver/usb/host/ehci-w90x900.c |
| 4 | * |
| 5 | * Copyright (c) 2008 Nuvoton technology corporation. |
| 6 | * |
| 7 | * Wan ZongShun <mcuos.com@gmail.com> |
| 8 | */ |
| 9 | |
| 10 | #include <linux/dma-mapping.h> |
| 11 | #include <linux/io.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/of.h> |
| 15 | #include <linux/platform_device.h> |
| 16 | #include <linux/usb.h> |
| 17 | #include <linux/usb/hcd.h> |
| 18 | |
| 19 | #include "ehci.h" |
| 20 | |
| 21 | /* enable phy0 and phy1 for w90p910 */ |
| 22 | #define ENPHY (0x01<<8) |
| 23 | #define PHY0_CTR (0xA4) |
| 24 | #define PHY1_CTR (0xA8) |
| 25 | |
| 26 | #define DRIVER_DESC "EHCI w90x900 driver" |
| 27 | |
| 28 | static const char hcd_name[] = "ehci-w90x900 "; |
| 29 | |
| 30 | static struct hc_driver __read_mostly ehci_w90x900_hc_driver; |
| 31 | |
| 32 | static int ehci_w90x900_probe(struct platform_device *pdev) |
| 33 | { |
| 34 | struct usb_hcd *hcd; |
| 35 | struct ehci_hcd *ehci; |
| 36 | struct resource *res; |
| 37 | int retval = 0, irq; |
| 38 | unsigned long val; |
| 39 | |
| 40 | hcd = usb_create_hcd(&ehci_w90x900_hc_driver, |
| 41 | &pdev->dev, "w90x900 EHCI"); |
| 42 | if (!hcd) { |
| 43 | retval = -ENOMEM; |
| 44 | goto err1; |
| 45 | } |
| 46 | |
| 47 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 48 | hcd->regs = devm_ioremap_resource(&pdev->dev, res); |
| 49 | if (IS_ERR(hcd->regs)) { |
| 50 | retval = PTR_ERR(hcd->regs); |
| 51 | goto err2; |
| 52 | } |
| 53 | hcd->rsrc_start = res->start; |
| 54 | hcd->rsrc_len = resource_size(res); |
| 55 | |
| 56 | ehci = hcd_to_ehci(hcd); |
| 57 | ehci->caps = hcd->regs; |
| 58 | ehci->regs = hcd->regs + |
| 59 | HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase)); |
| 60 | |
| 61 | /* enable PHY 0,1,the regs only apply to w90p910 |
| 62 | * 0xA4,0xA8 were offsets of PHY0 and PHY1 controller of |
| 63 | * w90p910 IC relative to ehci->regs. |
| 64 | */ |
| 65 | val = __raw_readl(ehci->regs+PHY0_CTR); |
| 66 | val |= ENPHY; |
| 67 | __raw_writel(val, ehci->regs+PHY0_CTR); |
| 68 | |
| 69 | val = __raw_readl(ehci->regs+PHY1_CTR); |
| 70 | val |= ENPHY; |
| 71 | __raw_writel(val, ehci->regs+PHY1_CTR); |
| 72 | |
| 73 | irq = platform_get_irq(pdev, 0); |
| 74 | if (irq < 0) { |
| 75 | retval = irq; |
| 76 | goto err2; |
| 77 | } |
| 78 | |
| 79 | retval = usb_add_hcd(hcd, irq, IRQF_SHARED); |
| 80 | if (retval != 0) |
| 81 | goto err2; |
| 82 | |
| 83 | device_wakeup_enable(hcd->self.controller); |
| 84 | return retval; |
| 85 | err2: |
| 86 | usb_put_hcd(hcd); |
| 87 | err1: |
| 88 | return retval; |
| 89 | } |
| 90 | |
| 91 | static int ehci_w90x900_remove(struct platform_device *pdev) |
| 92 | { |
| 93 | struct usb_hcd *hcd = platform_get_drvdata(pdev); |
| 94 | |
| 95 | usb_remove_hcd(hcd); |
| 96 | usb_put_hcd(hcd); |
| 97 | |
| 98 | return 0; |
| 99 | } |
| 100 | |
| 101 | static struct platform_driver ehci_hcd_w90x900_driver = { |
| 102 | .probe = ehci_w90x900_probe, |
| 103 | .remove = ehci_w90x900_remove, |
| 104 | .driver = { |
| 105 | .name = "w90x900-ehci", |
| 106 | }, |
| 107 | }; |
| 108 | |
| 109 | static int __init ehci_w90X900_init(void) |
| 110 | { |
| 111 | if (usb_disabled()) |
| 112 | return -ENODEV; |
| 113 | |
| 114 | pr_info("%s: " DRIVER_DESC "\n", hcd_name); |
| 115 | |
| 116 | ehci_init_driver(&ehci_w90x900_hc_driver, NULL); |
| 117 | return platform_driver_register(&ehci_hcd_w90x900_driver); |
| 118 | } |
| 119 | module_init(ehci_w90X900_init); |
| 120 | |
| 121 | static void __exit ehci_w90X900_cleanup(void) |
| 122 | { |
| 123 | platform_driver_unregister(&ehci_hcd_w90x900_driver); |
| 124 | } |
| 125 | module_exit(ehci_w90X900_cleanup); |
| 126 | |
| 127 | MODULE_DESCRIPTION(DRIVER_DESC); |
| 128 | MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>"); |
| 129 | MODULE_ALIAS("platform:w90p910-ehci"); |
| 130 | MODULE_LICENSE("GPL v2"); |