| 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 | |
| 17 | static 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 | |
| 42 | static 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 | |
| 69 | static 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 | |
| 126 | err_iounmap: |
| 127 | iounmap(hcd->regs); |
| 128 | |
| 129 | err_release_region: |
| 130 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); |
| 131 | err_put_hcd: |
| 132 | usb_put_hcd(hcd); |
| 133 | return ret; |
| 134 | } |
| 135 | |
| 136 | static 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 | |
| 153 | static 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 | |
| 162 | MODULE_ALIAS("platform:rt3883-ehci"); |
| 163 | |
