Deepak Sikri | c8c38de | 2010-11-10 14:33:18 +0530 | [diff] [blame] | 1 | /* |
| 2 | * OHCI HCD (Host Controller Driver) for USB. |
| 3 | * |
| 4 | * Copyright (C) 2010 ST Microelectronics. |
| 5 | * Deepak Sikri<deepak.sikri@st.com> |
| 6 | * |
| 7 | * Based on various ohci-*.c drivers |
| 8 | * |
| 9 | * This file is licensed under the terms of the GNU General Public |
| 10 | * License version 2. This program is licensed "as is" without any |
| 11 | * warranty of any kind, whether express or implied. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/signal.h> |
| 15 | #include <linux/platform_device.h> |
| 16 | #include <linux/clk.h> |
| 17 | |
| 18 | struct spear_ohci { |
| 19 | struct ohci_hcd ohci; |
| 20 | struct clk *clk; |
| 21 | }; |
| 22 | |
| 23 | #define to_spear_ohci(hcd) (struct spear_ohci *)hcd_to_ohci(hcd) |
| 24 | |
| 25 | static void spear_start_ohci(struct spear_ohci *ohci) |
| 26 | { |
| 27 | clk_enable(ohci->clk); |
| 28 | } |
| 29 | |
| 30 | static void spear_stop_ohci(struct spear_ohci *ohci) |
| 31 | { |
| 32 | clk_disable(ohci->clk); |
| 33 | } |
| 34 | |
| 35 | static int __devinit ohci_spear_start(struct usb_hcd *hcd) |
| 36 | { |
| 37 | struct ohci_hcd *ohci = hcd_to_ohci(hcd); |
| 38 | int ret; |
| 39 | |
| 40 | ret = ohci_init(ohci); |
| 41 | if (ret < 0) |
| 42 | return ret; |
| 43 | ohci->regs = hcd->regs; |
| 44 | |
| 45 | ret = ohci_run(ohci); |
| 46 | if (ret < 0) { |
| 47 | dev_err(hcd->self.controller, "can't start\n"); |
| 48 | ohci_stop(hcd); |
| 49 | return ret; |
| 50 | } |
| 51 | |
| 52 | create_debug_files(ohci); |
| 53 | |
| 54 | #ifdef DEBUG |
| 55 | ohci_dump(ohci, 1); |
| 56 | #endif |
| 57 | return 0; |
| 58 | } |
| 59 | |
| 60 | static const struct hc_driver ohci_spear_hc_driver = { |
| 61 | .description = hcd_name, |
| 62 | .product_desc = "SPEAr OHCI", |
| 63 | .hcd_priv_size = sizeof(struct spear_ohci), |
| 64 | |
| 65 | /* generic hardware linkage */ |
| 66 | .irq = ohci_irq, |
| 67 | .flags = HCD_USB11 | HCD_MEMORY, |
| 68 | |
| 69 | /* basic lifecycle operations */ |
| 70 | .start = ohci_spear_start, |
| 71 | .stop = ohci_stop, |
| 72 | .shutdown = ohci_shutdown, |
| 73 | #ifdef CONFIG_PM |
| 74 | .bus_suspend = ohci_bus_suspend, |
| 75 | .bus_resume = ohci_bus_resume, |
| 76 | #endif |
| 77 | |
| 78 | /* managing i/o requests and associated device resources */ |
| 79 | .urb_enqueue = ohci_urb_enqueue, |
| 80 | .urb_dequeue = ohci_urb_dequeue, |
| 81 | .endpoint_disable = ohci_endpoint_disable, |
| 82 | |
| 83 | /* scheduling support */ |
| 84 | .get_frame_number = ohci_get_frame, |
| 85 | |
| 86 | /* root hub support */ |
| 87 | .hub_status_data = ohci_hub_status_data, |
| 88 | .hub_control = ohci_hub_control, |
| 89 | |
| 90 | .start_port_reset = ohci_start_port_reset, |
| 91 | }; |
| 92 | |
| 93 | static int spear_ohci_hcd_drv_probe(struct platform_device *pdev) |
| 94 | { |
| 95 | const struct hc_driver *driver = &ohci_spear_hc_driver; |
| 96 | struct usb_hcd *hcd = NULL; |
| 97 | struct clk *usbh_clk; |
| 98 | struct spear_ohci *ohci_p; |
| 99 | struct resource *res; |
| 100 | int retval, irq; |
| 101 | int *pdata = pdev->dev.platform_data; |
| 102 | char clk_name[20] = "usbh_clk"; |
| 103 | |
| 104 | if (pdata == NULL) |
| 105 | return -EFAULT; |
| 106 | |
| 107 | irq = platform_get_irq(pdev, 0); |
| 108 | if (irq < 0) { |
| 109 | retval = irq; |
| 110 | goto fail_irq_get; |
| 111 | } |
| 112 | |
| 113 | if (*pdata >= 0) |
| 114 | sprintf(clk_name, "usbh.%01d_clk", *pdata); |
| 115 | |
| 116 | usbh_clk = clk_get(NULL, clk_name); |
| 117 | if (IS_ERR(usbh_clk)) { |
| 118 | dev_err(&pdev->dev, "Error getting interface clock\n"); |
| 119 | retval = PTR_ERR(usbh_clk); |
| 120 | goto fail_get_usbh_clk; |
| 121 | } |
| 122 | |
| 123 | hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); |
| 124 | if (!hcd) { |
| 125 | retval = -ENOMEM; |
| 126 | goto fail_create_hcd; |
| 127 | } |
| 128 | |
| 129 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 130 | if (!res) { |
| 131 | retval = -ENODEV; |
| 132 | goto fail_request_resource; |
| 133 | } |
| 134 | |
| 135 | hcd->rsrc_start = pdev->resource[0].start; |
| 136 | hcd->rsrc_len = resource_size(res); |
| 137 | if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { |
| 138 | dev_dbg(&pdev->dev, "request_mem_region failed\n"); |
| 139 | retval = -EBUSY; |
| 140 | goto fail_request_resource; |
| 141 | } |
| 142 | |
| 143 | hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); |
| 144 | if (!hcd->regs) { |
| 145 | dev_dbg(&pdev->dev, "ioremap failed\n"); |
| 146 | retval = -ENOMEM; |
| 147 | goto fail_ioremap; |
| 148 | } |
| 149 | |
| 150 | ohci_p = (struct spear_ohci *)hcd_to_ohci(hcd); |
| 151 | ohci_p->clk = usbh_clk; |
| 152 | spear_start_ohci(ohci_p); |
| 153 | ohci_hcd_init(hcd_to_ohci(hcd)); |
| 154 | |
| 155 | retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), IRQF_DISABLED); |
| 156 | if (retval == 0) |
| 157 | return retval; |
| 158 | |
| 159 | spear_stop_ohci(ohci_p); |
| 160 | iounmap(hcd->regs); |
| 161 | fail_ioremap: |
| 162 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); |
| 163 | fail_request_resource: |
| 164 | usb_put_hcd(hcd); |
| 165 | fail_create_hcd: |
| 166 | clk_put(usbh_clk); |
| 167 | fail_get_usbh_clk: |
| 168 | fail_irq_get: |
| 169 | dev_err(&pdev->dev, "init fail, %d\n", retval); |
| 170 | |
| 171 | return retval; |
| 172 | } |
| 173 | |
| 174 | static int spear_ohci_hcd_drv_remove(struct platform_device *pdev) |
| 175 | { |
| 176 | struct usb_hcd *hcd = platform_get_drvdata(pdev); |
| 177 | struct spear_ohci *ohci_p = to_spear_ohci(hcd); |
| 178 | |
| 179 | usb_remove_hcd(hcd); |
| 180 | if (ohci_p->clk) |
| 181 | spear_stop_ohci(ohci_p); |
| 182 | |
| 183 | iounmap(hcd->regs); |
| 184 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); |
| 185 | usb_put_hcd(hcd); |
| 186 | |
| 187 | if (ohci_p->clk) |
| 188 | clk_put(ohci_p->clk); |
| 189 | platform_set_drvdata(pdev, NULL); |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | #if defined(CONFIG_PM) |
| 194 | static int spear_ohci_hcd_drv_suspend(struct platform_device *dev, |
| 195 | pm_message_t message) |
| 196 | { |
| 197 | struct usb_hcd *hcd = platform_get_drvdata(dev); |
| 198 | struct ohci_hcd *ohci = hcd_to_ohci(hcd); |
| 199 | struct spear_ohci *ohci_p = to_spear_ohci(hcd); |
| 200 | |
| 201 | if (time_before(jiffies, ohci->next_statechange)) |
| 202 | msleep(5); |
| 203 | ohci->next_statechange = jiffies; |
| 204 | |
| 205 | spear_stop_ohci(ohci_p); |
| 206 | ohci_to_hcd(ohci)->state = HC_STATE_SUSPENDED; |
| 207 | return 0; |
| 208 | } |
| 209 | |
| 210 | static int spear_ohci_hcd_drv_resume(struct platform_device *dev) |
| 211 | { |
| 212 | struct usb_hcd *hcd = platform_get_drvdata(dev); |
| 213 | struct ohci_hcd *ohci = hcd_to_ohci(hcd); |
| 214 | struct spear_ohci *ohci_p = to_spear_ohci(hcd); |
| 215 | |
| 216 | if (time_before(jiffies, ohci->next_statechange)) |
| 217 | msleep(5); |
| 218 | ohci->next_statechange = jiffies; |
| 219 | |
| 220 | spear_start_ohci(ohci_p); |
| 221 | ohci_finish_controller_resume(hcd); |
| 222 | return 0; |
| 223 | } |
| 224 | #endif |
| 225 | |
| 226 | /* Driver definition to register with the platform bus */ |
| 227 | static struct platform_driver spear_ohci_hcd_driver = { |
| 228 | .probe = spear_ohci_hcd_drv_probe, |
| 229 | .remove = spear_ohci_hcd_drv_remove, |
| 230 | #ifdef CONFIG_PM |
| 231 | .suspend = spear_ohci_hcd_drv_suspend, |
| 232 | .resume = spear_ohci_hcd_drv_resume, |
| 233 | #endif |
| 234 | .driver = { |
| 235 | .owner = THIS_MODULE, |
| 236 | .name = "spear-ohci", |
| 237 | }, |
| 238 | }; |
| 239 | |
| 240 | MODULE_ALIAS("platform:spear-ohci"); |