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