1 /* 2 * SAMSUNG EXYNOS USB HOST OHCI Controller 3 * 4 * Copyright (C) 2011 Samsung Electronics Co.Ltd 5 * Author: Jingoo Han <jg1.han@samsung.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2 of the License, or (at your 10 * option) any later version. 11 * 12 */ 13 14 #include <linux/clk.h> 15 #include <linux/platform_device.h> 16 #include <mach/ohci.h> 17 #include <plat/usb-phy.h> 18 19 struct exynos_ohci_hcd { 20 struct device *dev; 21 struct usb_hcd *hcd; 22 struct clk *clk; 23 }; 24 25 static int ohci_exynos_start(struct usb_hcd *hcd) 26 { 27 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 28 int ret; 29 30 ohci_dbg(ohci, "ohci_exynos_start, ohci:%p", ohci); 31 32 ret = ohci_init(ohci); 33 if (ret < 0) 34 return ret; 35 36 ret = ohci_run(ohci); 37 if (ret < 0) { 38 dev_err(hcd->self.controller, "can't start %s\n", 39 hcd->self.bus_name); 40 ohci_stop(hcd); 41 return ret; 42 } 43 44 return 0; 45 } 46 47 static const struct hc_driver exynos_ohci_hc_driver = { 48 .description = hcd_name, 49 .product_desc = "EXYNOS OHCI Host Controller", 50 .hcd_priv_size = sizeof(struct ohci_hcd), 51 52 .irq = ohci_irq, 53 .flags = HCD_MEMORY|HCD_USB11, 54 55 .start = ohci_exynos_start, 56 .stop = ohci_stop, 57 .shutdown = ohci_shutdown, 58 59 .get_frame_number = ohci_get_frame, 60 61 .urb_enqueue = ohci_urb_enqueue, 62 .urb_dequeue = ohci_urb_dequeue, 63 .endpoint_disable = ohci_endpoint_disable, 64 65 .hub_status_data = ohci_hub_status_data, 66 .hub_control = ohci_hub_control, 67 #ifdef CONFIG_PM 68 .bus_suspend = ohci_bus_suspend, 69 .bus_resume = ohci_bus_resume, 70 #endif 71 .start_port_reset = ohci_start_port_reset, 72 }; 73 74 static int __devinit exynos_ohci_probe(struct platform_device *pdev) 75 { 76 struct exynos4_ohci_platdata *pdata; 77 struct exynos_ohci_hcd *exynos_ohci; 78 struct usb_hcd *hcd; 79 struct ohci_hcd *ohci; 80 struct resource *res; 81 int irq; 82 int err; 83 84 pdata = pdev->dev.platform_data; 85 if (!pdata) { 86 dev_err(&pdev->dev, "No platform data defined\n"); 87 return -EINVAL; 88 } 89 90 exynos_ohci = kzalloc(sizeof(struct exynos_ohci_hcd), GFP_KERNEL); 91 if (!exynos_ohci) 92 return -ENOMEM; 93 94 exynos_ohci->dev = &pdev->dev; 95 96 hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev, 97 dev_name(&pdev->dev)); 98 if (!hcd) { 99 dev_err(&pdev->dev, "Unable to create HCD\n"); 100 err = -ENOMEM; 101 goto fail_hcd; 102 } 103 104 exynos_ohci->hcd = hcd; 105 exynos_ohci->clk = clk_get(&pdev->dev, "usbhost"); 106 107 if (IS_ERR(exynos_ohci->clk)) { 108 dev_err(&pdev->dev, "Failed to get usbhost clock\n"); 109 err = PTR_ERR(exynos_ohci->clk); 110 goto fail_clk; 111 } 112 113 err = clk_enable(exynos_ohci->clk); 114 if (err) 115 goto fail_clken; 116 117 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 118 if (!res) { 119 dev_err(&pdev->dev, "Failed to get I/O memory\n"); 120 err = -ENXIO; 121 goto fail_io; 122 } 123 124 hcd->rsrc_start = res->start; 125 hcd->rsrc_len = resource_size(res); 126 hcd->regs = ioremap(res->start, resource_size(res)); 127 if (!hcd->regs) { 128 dev_err(&pdev->dev, "Failed to remap I/O memory\n"); 129 err = -ENOMEM; 130 goto fail_io; 131 } 132 133 irq = platform_get_irq(pdev, 0); 134 if (!irq) { 135 dev_err(&pdev->dev, "Failed to get IRQ\n"); 136 err = -ENODEV; 137 goto fail; 138 } 139 140 if (pdata->phy_init) 141 pdata->phy_init(pdev, S5P_USB_PHY_HOST); 142 143 ohci = hcd_to_ohci(hcd); 144 ohci_hcd_init(ohci); 145 146 err = usb_add_hcd(hcd, irq, IRQF_SHARED); 147 if (err) { 148 dev_err(&pdev->dev, "Failed to add USB HCD\n"); 149 goto fail; 150 } 151 152 platform_set_drvdata(pdev, exynos_ohci); 153 154 return 0; 155 156 fail: 157 iounmap(hcd->regs); 158 fail_io: 159 clk_disable(exynos_ohci->clk); 160 fail_clken: 161 clk_put(exynos_ohci->clk); 162 fail_clk: 163 usb_put_hcd(hcd); 164 fail_hcd: 165 kfree(exynos_ohci); 166 return err; 167 } 168 169 static int __devexit exynos_ohci_remove(struct platform_device *pdev) 170 { 171 struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data; 172 struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev); 173 struct usb_hcd *hcd = exynos_ohci->hcd; 174 175 usb_remove_hcd(hcd); 176 177 if (pdata && pdata->phy_exit) 178 pdata->phy_exit(pdev, S5P_USB_PHY_HOST); 179 180 iounmap(hcd->regs); 181 182 clk_disable(exynos_ohci->clk); 183 clk_put(exynos_ohci->clk); 184 185 usb_put_hcd(hcd); 186 kfree(exynos_ohci); 187 188 return 0; 189 } 190 191 static void exynos_ohci_shutdown(struct platform_device *pdev) 192 { 193 struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev); 194 struct usb_hcd *hcd = exynos_ohci->hcd; 195 196 if (hcd->driver->shutdown) 197 hcd->driver->shutdown(hcd); 198 } 199 200 #ifdef CONFIG_PM 201 static int exynos_ohci_suspend(struct device *dev) 202 { 203 struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev); 204 struct usb_hcd *hcd = exynos_ohci->hcd; 205 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 206 struct platform_device *pdev = to_platform_device(dev); 207 struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data; 208 unsigned long flags; 209 int rc = 0; 210 211 /* 212 * Root hub was already suspended. Disable irq emission and 213 * mark HW unaccessible, bail out if RH has been resumed. Use 214 * the spinlock to properly synchronize with possible pending 215 * RH suspend or resume activity. 216 */ 217 spin_lock_irqsave(&ohci->lock, flags); 218 if (ohci->rh_state != OHCI_RH_SUSPENDED && 219 ohci->rh_state != OHCI_RH_HALTED) { 220 rc = -EINVAL; 221 goto fail; 222 } 223 224 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 225 226 if (pdata && pdata->phy_exit) 227 pdata->phy_exit(pdev, S5P_USB_PHY_HOST); 228 fail: 229 spin_unlock_irqrestore(&ohci->lock, flags); 230 231 return rc; 232 } 233 234 static int exynos_ohci_resume(struct device *dev) 235 { 236 struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev); 237 struct usb_hcd *hcd = exynos_ohci->hcd; 238 struct platform_device *pdev = to_platform_device(dev); 239 struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data; 240 241 if (pdata && pdata->phy_init) 242 pdata->phy_init(pdev, S5P_USB_PHY_HOST); 243 244 /* Mark hardware accessible again as we are out of D3 state by now */ 245 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 246 247 ohci_finish_controller_resume(hcd); 248 249 return 0; 250 } 251 #else 252 #define exynos_ohci_suspend NULL 253 #define exynos_ohci_resume NULL 254 #endif 255 256 static const struct dev_pm_ops exynos_ohci_pm_ops = { 257 .suspend = exynos_ohci_suspend, 258 .resume = exynos_ohci_resume, 259 }; 260 261 static struct platform_driver exynos_ohci_driver = { 262 .probe = exynos_ohci_probe, 263 .remove = __devexit_p(exynos_ohci_remove), 264 .shutdown = exynos_ohci_shutdown, 265 .driver = { 266 .name = "exynos-ohci", 267 .owner = THIS_MODULE, 268 .pm = &exynos_ohci_pm_ops, 269 } 270 }; 271 272 MODULE_ALIAS("platform:exynos-ohci"); 273 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 274