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/of.h> 16 #include <linux/platform_device.h> 17 #include <linux/platform_data/usb-exynos.h> 18 #include <plat/usb-phy.h> 19 20 struct exynos_ohci_hcd { 21 struct device *dev; 22 struct usb_hcd *hcd; 23 struct clk *clk; 24 }; 25 26 static int ohci_exynos_start(struct usb_hcd *hcd) 27 { 28 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 29 int ret; 30 31 ohci_dbg(ohci, "ohci_exynos_start, ohci:%p", ohci); 32 33 ret = ohci_init(ohci); 34 if (ret < 0) 35 return ret; 36 37 ret = ohci_run(ohci); 38 if (ret < 0) { 39 dev_err(hcd->self.controller, "can't start %s\n", 40 hcd->self.bus_name); 41 ohci_stop(hcd); 42 return ret; 43 } 44 45 return 0; 46 } 47 48 static const struct hc_driver exynos_ohci_hc_driver = { 49 .description = hcd_name, 50 .product_desc = "EXYNOS OHCI Host Controller", 51 .hcd_priv_size = sizeof(struct ohci_hcd), 52 53 .irq = ohci_irq, 54 .flags = HCD_MEMORY|HCD_USB11, 55 56 .start = ohci_exynos_start, 57 .stop = ohci_stop, 58 .shutdown = ohci_shutdown, 59 60 .get_frame_number = ohci_get_frame, 61 62 .urb_enqueue = ohci_urb_enqueue, 63 .urb_dequeue = ohci_urb_dequeue, 64 .endpoint_disable = ohci_endpoint_disable, 65 66 .hub_status_data = ohci_hub_status_data, 67 .hub_control = ohci_hub_control, 68 #ifdef CONFIG_PM 69 .bus_suspend = ohci_bus_suspend, 70 .bus_resume = ohci_bus_resume, 71 #endif 72 .start_port_reset = ohci_start_port_reset, 73 }; 74 75 static u64 ohci_exynos_dma_mask = DMA_BIT_MASK(32); 76 77 static int __devinit exynos_ohci_probe(struct platform_device *pdev) 78 { 79 struct exynos4_ohci_platdata *pdata; 80 struct exynos_ohci_hcd *exynos_ohci; 81 struct usb_hcd *hcd; 82 struct ohci_hcd *ohci; 83 struct resource *res; 84 int irq; 85 int err; 86 87 pdata = pdev->dev.platform_data; 88 if (!pdata) { 89 dev_err(&pdev->dev, "No platform data defined\n"); 90 return -EINVAL; 91 } 92 93 /* 94 * Right now device-tree probed devices don't get dma_mask set. 95 * Since shared usb code relies on it, set it here for now. 96 * Once we move to full device tree support this will vanish off. 97 */ 98 if (!pdev->dev.dma_mask) 99 pdev->dev.dma_mask = &ohci_exynos_dma_mask; 100 if (!pdev->dev.coherent_dma_mask) 101 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); 102 103 exynos_ohci = devm_kzalloc(&pdev->dev, sizeof(struct exynos_ohci_hcd), 104 GFP_KERNEL); 105 if (!exynos_ohci) 106 return -ENOMEM; 107 108 exynos_ohci->dev = &pdev->dev; 109 110 hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev, 111 dev_name(&pdev->dev)); 112 if (!hcd) { 113 dev_err(&pdev->dev, "Unable to create HCD\n"); 114 return -ENOMEM; 115 } 116 117 exynos_ohci->hcd = hcd; 118 exynos_ohci->clk = clk_get(&pdev->dev, "usbhost"); 119 120 if (IS_ERR(exynos_ohci->clk)) { 121 dev_err(&pdev->dev, "Failed to get usbhost clock\n"); 122 err = PTR_ERR(exynos_ohci->clk); 123 goto fail_clk; 124 } 125 126 err = clk_enable(exynos_ohci->clk); 127 if (err) 128 goto fail_clken; 129 130 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 131 if (!res) { 132 dev_err(&pdev->dev, "Failed to get I/O memory\n"); 133 err = -ENXIO; 134 goto fail_io; 135 } 136 137 hcd->rsrc_start = res->start; 138 hcd->rsrc_len = resource_size(res); 139 hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len); 140 if (!hcd->regs) { 141 dev_err(&pdev->dev, "Failed to remap I/O memory\n"); 142 err = -ENOMEM; 143 goto fail_io; 144 } 145 146 irq = platform_get_irq(pdev, 0); 147 if (!irq) { 148 dev_err(&pdev->dev, "Failed to get IRQ\n"); 149 err = -ENODEV; 150 goto fail_io; 151 } 152 153 if (pdata->phy_init) 154 pdata->phy_init(pdev, S5P_USB_PHY_HOST); 155 156 ohci = hcd_to_ohci(hcd); 157 ohci_hcd_init(ohci); 158 159 err = usb_add_hcd(hcd, irq, IRQF_SHARED); 160 if (err) { 161 dev_err(&pdev->dev, "Failed to add USB HCD\n"); 162 goto fail_io; 163 } 164 165 platform_set_drvdata(pdev, exynos_ohci); 166 167 return 0; 168 169 fail_io: 170 clk_disable(exynos_ohci->clk); 171 fail_clken: 172 clk_put(exynos_ohci->clk); 173 fail_clk: 174 usb_put_hcd(hcd); 175 return err; 176 } 177 178 static int __devexit exynos_ohci_remove(struct platform_device *pdev) 179 { 180 struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data; 181 struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev); 182 struct usb_hcd *hcd = exynos_ohci->hcd; 183 184 usb_remove_hcd(hcd); 185 186 if (pdata && pdata->phy_exit) 187 pdata->phy_exit(pdev, S5P_USB_PHY_HOST); 188 189 clk_disable(exynos_ohci->clk); 190 clk_put(exynos_ohci->clk); 191 192 usb_put_hcd(hcd); 193 194 return 0; 195 } 196 197 static void exynos_ohci_shutdown(struct platform_device *pdev) 198 { 199 struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev); 200 struct usb_hcd *hcd = exynos_ohci->hcd; 201 202 if (hcd->driver->shutdown) 203 hcd->driver->shutdown(hcd); 204 } 205 206 #ifdef CONFIG_PM 207 static int exynos_ohci_suspend(struct device *dev) 208 { 209 struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev); 210 struct usb_hcd *hcd = exynos_ohci->hcd; 211 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 212 struct platform_device *pdev = to_platform_device(dev); 213 struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data; 214 unsigned long flags; 215 int rc = 0; 216 217 /* 218 * Root hub was already suspended. Disable irq emission and 219 * mark HW unaccessible, bail out if RH has been resumed. Use 220 * the spinlock to properly synchronize with possible pending 221 * RH suspend or resume activity. 222 */ 223 spin_lock_irqsave(&ohci->lock, flags); 224 if (ohci->rh_state != OHCI_RH_SUSPENDED && 225 ohci->rh_state != OHCI_RH_HALTED) { 226 rc = -EINVAL; 227 goto fail; 228 } 229 230 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 231 232 if (pdata && pdata->phy_exit) 233 pdata->phy_exit(pdev, S5P_USB_PHY_HOST); 234 235 clk_disable(exynos_ohci->clk); 236 237 fail: 238 spin_unlock_irqrestore(&ohci->lock, flags); 239 240 return rc; 241 } 242 243 static int exynos_ohci_resume(struct device *dev) 244 { 245 struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev); 246 struct usb_hcd *hcd = exynos_ohci->hcd; 247 struct platform_device *pdev = to_platform_device(dev); 248 struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data; 249 250 clk_enable(exynos_ohci->clk); 251 252 if (pdata && pdata->phy_init) 253 pdata->phy_init(pdev, S5P_USB_PHY_HOST); 254 255 /* Mark hardware accessible again as we are out of D3 state by now */ 256 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 257 258 ohci_finish_controller_resume(hcd); 259 260 return 0; 261 } 262 #else 263 #define exynos_ohci_suspend NULL 264 #define exynos_ohci_resume NULL 265 #endif 266 267 static const struct dev_pm_ops exynos_ohci_pm_ops = { 268 .suspend = exynos_ohci_suspend, 269 .resume = exynos_ohci_resume, 270 }; 271 272 #ifdef CONFIG_OF 273 static const struct of_device_id exynos_ohci_match[] = { 274 { .compatible = "samsung,exynos-ohci" }, 275 {}, 276 }; 277 MODULE_DEVICE_TABLE(of, exynos_ohci_match); 278 #endif 279 280 static struct platform_driver exynos_ohci_driver = { 281 .probe = exynos_ohci_probe, 282 .remove = __devexit_p(exynos_ohci_remove), 283 .shutdown = exynos_ohci_shutdown, 284 .driver = { 285 .name = "exynos-ohci", 286 .owner = THIS_MODULE, 287 .pm = &exynos_ohci_pm_ops, 288 .of_match_table = of_match_ptr(exynos_ohci_match), 289 } 290 }; 291 292 MODULE_ALIAS("platform:exynos-ohci"); 293 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 294