Chris Metcalf | 47fc28b | 2012-05-09 13:58:14 -0400 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2012 Tilera Corporation. All Rights Reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation, version 2. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 11 | * NON INFRINGEMENT. See the GNU General Public License for |
| 12 | * more details. |
| 13 | */ |
| 14 | |
| 15 | /* |
| 16 | * Tilera TILE-Gx USB OHCI host controller driver. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/irq.h> |
| 20 | #include <linux/platform_device.h> |
| 21 | #include <linux/usb/tilegx.h> |
| 22 | #include <linux/usb.h> |
| 23 | |
| 24 | #include <asm/homecache.h> |
| 25 | |
| 26 | #include <gxio/iorpc_usb_host.h> |
| 27 | #include <gxio/usb_host.h> |
| 28 | |
| 29 | static void tilegx_start_ohc(void) |
| 30 | { |
| 31 | } |
| 32 | |
| 33 | static void tilegx_stop_ohc(void) |
| 34 | { |
| 35 | } |
| 36 | |
| 37 | static int tilegx_ohci_start(struct usb_hcd *hcd) |
| 38 | { |
| 39 | struct ohci_hcd *ohci = hcd_to_ohci(hcd); |
| 40 | int ret; |
| 41 | |
| 42 | ret = ohci_init(ohci); |
| 43 | if (ret < 0) |
| 44 | return ret; |
| 45 | |
| 46 | ret = ohci_run(ohci); |
| 47 | if (ret < 0) { |
| 48 | dev_err(hcd->self.controller, "can't start %s\n", |
| 49 | hcd->self.bus_name); |
| 50 | ohci_stop(hcd); |
| 51 | return ret; |
| 52 | } |
| 53 | |
| 54 | return 0; |
| 55 | } |
| 56 | |
| 57 | static const struct hc_driver ohci_tilegx_hc_driver = { |
| 58 | .description = hcd_name, |
| 59 | .product_desc = "Tile-Gx OHCI", |
| 60 | .hcd_priv_size = sizeof(struct ohci_hcd), |
| 61 | |
| 62 | /* |
| 63 | * Generic hardware linkage. |
| 64 | */ |
| 65 | .irq = ohci_irq, |
| 66 | .flags = HCD_MEMORY | HCD_LOCAL_MEM | HCD_USB11, |
| 67 | |
| 68 | /* |
| 69 | * Basic lifecycle operations. |
| 70 | */ |
| 71 | .start = tilegx_ohci_start, |
| 72 | .stop = ohci_stop, |
| 73 | .shutdown = ohci_shutdown, |
| 74 | |
| 75 | /* |
| 76 | * Managing I/O requests and associated device resources. |
| 77 | */ |
| 78 | .urb_enqueue = ohci_urb_enqueue, |
| 79 | .urb_dequeue = ohci_urb_dequeue, |
| 80 | .endpoint_disable = ohci_endpoint_disable, |
| 81 | |
| 82 | /* |
| 83 | * Scheduling support. |
| 84 | */ |
| 85 | .get_frame_number = ohci_get_frame, |
| 86 | |
| 87 | /* |
| 88 | * Root hub support. |
| 89 | */ |
| 90 | .hub_status_data = ohci_hub_status_data, |
| 91 | .hub_control = ohci_hub_control, |
| 92 | .start_port_reset = ohci_start_port_reset, |
| 93 | }; |
| 94 | |
| 95 | static int ohci_hcd_tilegx_drv_probe(struct platform_device *pdev) |
| 96 | { |
| 97 | struct usb_hcd *hcd; |
| 98 | struct tilegx_usb_platform_data *pdata = pdev->dev.platform_data; |
| 99 | pte_t pte = { 0 }; |
| 100 | int my_cpu = smp_processor_id(); |
| 101 | int ret; |
| 102 | |
| 103 | if (usb_disabled()) |
| 104 | return -ENODEV; |
| 105 | |
| 106 | /* |
| 107 | * Try to initialize our GXIO context; if we can't, the device |
| 108 | * doesn't exist. |
| 109 | */ |
| 110 | if (gxio_usb_host_init(&pdata->usb_ctx, pdata->dev_index, 0) != 0) |
| 111 | return -ENXIO; |
| 112 | |
| 113 | hcd = usb_create_hcd(&ohci_tilegx_hc_driver, &pdev->dev, |
| 114 | dev_name(&pdev->dev)); |
| 115 | if (!hcd) |
| 116 | return -ENOMEM; |
| 117 | |
| 118 | /* |
| 119 | * We don't use rsrc_start to map in our registers, but seems like |
| 120 | * we ought to set it to something, so we use the register VA. |
| 121 | */ |
| 122 | hcd->rsrc_start = |
| 123 | (ulong) gxio_usb_host_get_reg_start(&pdata->usb_ctx); |
| 124 | hcd->rsrc_len = gxio_usb_host_get_reg_len(&pdata->usb_ctx); |
| 125 | hcd->regs = gxio_usb_host_get_reg_start(&pdata->usb_ctx); |
| 126 | |
| 127 | tilegx_start_ohc(); |
| 128 | |
| 129 | /* Create our IRQs and register them. */ |
| 130 | pdata->irq = create_irq(); |
| 131 | if (pdata->irq < 0) { |
| 132 | ret = -ENXIO; |
| 133 | goto err_no_irq; |
| 134 | } |
| 135 | |
| 136 | tile_irq_activate(pdata->irq, TILE_IRQ_PERCPU); |
| 137 | |
| 138 | /* Configure interrupts. */ |
| 139 | ret = gxio_usb_host_cfg_interrupt(&pdata->usb_ctx, |
| 140 | cpu_x(my_cpu), cpu_y(my_cpu), |
| 141 | KERNEL_PL, pdata->irq); |
| 142 | if (ret) { |
| 143 | ret = -ENXIO; |
| 144 | goto err_have_irq; |
| 145 | } |
| 146 | |
| 147 | /* Register all of our memory. */ |
| 148 | pte = pte_set_home(pte, PAGE_HOME_HASH); |
| 149 | ret = gxio_usb_host_register_client_memory(&pdata->usb_ctx, pte, 0); |
| 150 | if (ret) { |
| 151 | ret = -ENXIO; |
| 152 | goto err_have_irq; |
| 153 | } |
| 154 | |
| 155 | ohci_hcd_init(hcd_to_ohci(hcd)); |
| 156 | |
| 157 | ret = usb_add_hcd(hcd, pdata->irq, IRQF_SHARED); |
| 158 | if (ret == 0) { |
| 159 | platform_set_drvdata(pdev, hcd); |
| 160 | return ret; |
| 161 | } |
| 162 | |
| 163 | err_have_irq: |
| 164 | destroy_irq(pdata->irq); |
| 165 | err_no_irq: |
| 166 | tilegx_stop_ohc(); |
| 167 | usb_put_hcd(hcd); |
| 168 | gxio_usb_host_destroy(&pdata->usb_ctx); |
| 169 | return ret; |
| 170 | } |
| 171 | |
| 172 | static int ohci_hcd_tilegx_drv_remove(struct platform_device *pdev) |
| 173 | { |
| 174 | struct usb_hcd *hcd = platform_get_drvdata(pdev); |
| 175 | struct tilegx_usb_platform_data* pdata = pdev->dev.platform_data; |
| 176 | |
| 177 | usb_remove_hcd(hcd); |
| 178 | usb_put_hcd(hcd); |
| 179 | tilegx_stop_ohc(); |
| 180 | gxio_usb_host_destroy(&pdata->usb_ctx); |
| 181 | destroy_irq(pdata->irq); |
| 182 | platform_set_drvdata(pdev, NULL); |
| 183 | |
| 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | static void ohci_hcd_tilegx_drv_shutdown(struct platform_device *pdev) |
| 188 | { |
| 189 | usb_hcd_platform_shutdown(pdev); |
| 190 | ohci_hcd_tilegx_drv_remove(pdev); |
| 191 | } |
| 192 | |
| 193 | static struct platform_driver ohci_hcd_tilegx_driver = { |
| 194 | .probe = ohci_hcd_tilegx_drv_probe, |
| 195 | .remove = ohci_hcd_tilegx_drv_remove, |
| 196 | .shutdown = ohci_hcd_tilegx_drv_shutdown, |
| 197 | .driver = { |
| 198 | .name = "tilegx-ohci", |
| 199 | .owner = THIS_MODULE, |
| 200 | } |
| 201 | }; |
| 202 | |
| 203 | MODULE_ALIAS("platform:tilegx-ohci"); |