1/* 2 * Bus Glue for the built-in EHCI controller of the Ralink RT3662/RT3883 SoCs 3 * 4 * Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org> 5 * 6 * Parts of this file are based on Ralink's 2.6.21 BSP 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License version 2 as published 10 * by the Free Software Foundation. 11 */ 12 13#include <linux/platform_device.h> 14#include <asm/mach-ralink/rt3883.h> 15#include <asm/mach-ralink/rt3883_ehci_platform.h> 16 17static int ehci_rt3883_init(struct usb_hcd *hcd) 18{ 19 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 20 int ret; 21 22 ehci->caps = hcd->regs; 23 ehci->regs = hcd->regs + 24 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase)); 25 dbg_hcs_params(ehci, "reset"); 26 dbg_hcc_params(ehci, "reset"); 27 28 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); 29 ehci->sbrn = 0x20; 30 31 ehci_reset(ehci); 32 33 ret = ehci_init(hcd); 34 if (ret) 35 return ret; 36 37 ehci_port_power(ehci, 0); 38 39 return 0; 40} 41 42static const struct hc_driver ehci_rt3883_hc_driver = { 43 .description = hcd_name, 44 .product_desc = "Ralink RT3883 built-in EHCI controller", 45 .hcd_priv_size = sizeof(struct ehci_hcd), 46 .irq = ehci_irq, 47 .flags = HCD_MEMORY | HCD_USB2, 48 49 .reset = ehci_rt3883_init, 50 .start = ehci_run, 51 .stop = ehci_stop, 52 .shutdown = ehci_shutdown, 53 54 .urb_enqueue = ehci_urb_enqueue, 55 .urb_dequeue = ehci_urb_dequeue, 56 .endpoint_disable = ehci_endpoint_disable, 57 .endpoint_reset = ehci_endpoint_reset, 58 59 .get_frame_number = ehci_get_frame, 60 61 .hub_status_data = ehci_hub_status_data, 62 .hub_control = ehci_hub_control, 63 .relinquish_port = ehci_relinquish_port, 64 .port_handed_over = ehci_port_handed_over, 65 66 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, 67}; 68 69static int ehci_rt3883_probe(struct platform_device *pdev) 70{ 71 struct rt3883_ehci_platform_data *pdata; 72 struct usb_hcd *hcd; 73 struct resource *res; 74 int irq; 75 int ret; 76 77 if (usb_disabled()) 78 return -ENODEV; 79 80 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 81 if (!res) { 82 dev_dbg(&pdev->dev, "no IRQ specified for %s\n", 83 dev_name(&pdev->dev)); 84 return -ENODEV; 85 } 86 irq = res->start; 87 88 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 89 if (!res) { 90 dev_dbg(&pdev->dev, "no base address specified for %s\n", 91 dev_name(&pdev->dev)); 92 return -ENODEV; 93 } 94 95 hcd = usb_create_hcd(&ehci_rt3883_hc_driver, &pdev->dev, 96 dev_name(&pdev->dev)); 97 if (!hcd) 98 return -ENOMEM; 99 100 hcd->rsrc_start = res->start; 101 hcd->rsrc_len = res->end - res->start + 1; 102 103 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { 104 dev_dbg(&pdev->dev, "controller already in use\n"); 105 ret = -EBUSY; 106 goto err_put_hcd; 107 } 108 109 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); 110 if (!hcd->regs) { 111 dev_dbg(&pdev->dev, "error mapping memory\n"); 112 ret = -EFAULT; 113 goto err_release_region; 114 } 115 116 pdata = pdev->dev.platform_data; 117 if (pdata && pdata->start_hw) 118 pdata->start_hw(); 119 120 ret = usb_add_hcd(hcd, irq, IRQF_SHARED); 121 if (ret) 122 goto err_iounmap; 123 124 return 0; 125 126err_iounmap: 127 iounmap(hcd->regs); 128 129err_release_region: 130 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 131err_put_hcd: 132 usb_put_hcd(hcd); 133 return ret; 134} 135 136static int ehci_rt3883_remove(struct platform_device *pdev) 137{ 138 struct usb_hcd *hcd = platform_get_drvdata(pdev); 139 struct rt3883_ehci_platform_data *pdata; 140 141 usb_remove_hcd(hcd); 142 iounmap(hcd->regs); 143 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 144 usb_put_hcd(hcd); 145 146 pdata = pdev->dev.platform_data; 147 if (pdata && pdata->stop_hw) 148 pdata->stop_hw(); 149 150 return 0; 151} 152 153static struct platform_driver ehci_rt3883_driver = { 154 .probe = ehci_rt3883_probe, 155 .remove = ehci_rt3883_remove, 156 .driver = { 157 .owner = THIS_MODULE, 158 .name = "rt3883-ehci", 159 } 160}; 161 162MODULE_ALIAS("platform:rt3883-ehci"); 163