1 /* 2 * ehci-omap.c - driver for USBHOST on OMAP3/4 processors 3 * 4 * Bus Glue for the EHCI controllers in OMAP3/4 5 * Tested on several OMAP3 boards, and OMAP4 Pandaboard 6 * 7 * Copyright (C) 2007-2013 Texas Instruments, Inc. 8 * Author: Vikram Pandita <vikram.pandita@ti.com> 9 * Author: Anand Gadiyar <gadiyar@ti.com> 10 * Author: Keshava Munegowda <keshava_mgowda@ti.com> 11 * Author: Roger Quadros <rogerq@ti.com> 12 * 13 * Copyright (C) 2009 Nokia Corporation 14 * Contact: Felipe Balbi <felipe.balbi@nokia.com> 15 * 16 * Based on "ehci-fsl.c" and "ehci-au1xxx.c" ehci glue layers 17 * 18 * This program is free software; you can redistribute it and/or modify 19 * it under the terms of the GNU General Public License as published by 20 * the Free Software Foundation; either version 2 of the License, or 21 * (at your option) any later version. 22 * 23 * This program is distributed in the hope that it will be useful, 24 * but WITHOUT ANY WARRANTY; without even the implied warranty of 25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 26 * GNU General Public License for more details. 27 * 28 * You should have received a copy of the GNU General Public License 29 * along with this program; if not, write to the Free Software 30 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 31 * 32 */ 33 34 #include <linux/kernel.h> 35 #include <linux/module.h> 36 #include <linux/io.h> 37 #include <linux/platform_device.h> 38 #include <linux/slab.h> 39 #include <linux/usb/ulpi.h> 40 #include <linux/pm_runtime.h> 41 #include <linux/gpio.h> 42 #include <linux/clk.h> 43 #include <linux/usb.h> 44 #include <linux/usb/hcd.h> 45 #include <linux/of.h> 46 #include <linux/dma-mapping.h> 47 48 #include "ehci.h" 49 50 #include <linux/platform_data/usb-omap.h> 51 52 /* EHCI Register Set */ 53 #define EHCI_INSNREG04 (0xA0) 54 #define EHCI_INSNREG04_DISABLE_UNSUSPEND (1 << 5) 55 #define EHCI_INSNREG05_ULPI (0xA4) 56 #define EHCI_INSNREG05_ULPI_CONTROL_SHIFT 31 57 #define EHCI_INSNREG05_ULPI_PORTSEL_SHIFT 24 58 #define EHCI_INSNREG05_ULPI_OPSEL_SHIFT 22 59 #define EHCI_INSNREG05_ULPI_REGADD_SHIFT 16 60 #define EHCI_INSNREG05_ULPI_EXTREGADD_SHIFT 8 61 #define EHCI_INSNREG05_ULPI_WRDATA_SHIFT 0 62 63 #define DRIVER_DESC "OMAP-EHCI Host Controller driver" 64 65 static const char hcd_name[] = "ehci-omap"; 66 67 /*-------------------------------------------------------------------------*/ 68 69 struct omap_hcd { 70 struct usb_phy *phy[OMAP3_HS_USB_PORTS]; /* one PHY for each port */ 71 int nports; 72 }; 73 74 static inline void ehci_write(void __iomem *base, u32 reg, u32 val) 75 { 76 __raw_writel(val, base + reg); 77 } 78 79 static inline u32 ehci_read(void __iomem *base, u32 reg) 80 { 81 return __raw_readl(base + reg); 82 } 83 84 /* configure so an HC device and id are always provided */ 85 /* always called with process context; sleeping is OK */ 86 87 static struct hc_driver __read_mostly ehci_omap_hc_driver; 88 89 static const struct ehci_driver_overrides ehci_omap_overrides __initdata = { 90 .extra_priv_size = sizeof(struct omap_hcd), 91 }; 92 93 /** 94 * ehci_hcd_omap_probe - initialize TI-based HCDs 95 * 96 * Allocates basic resources for this USB host controller, and 97 * then invokes the start() method for the HCD associated with it 98 * through the hotplug entry's driver_data. 99 */ 100 static int ehci_hcd_omap_probe(struct platform_device *pdev) 101 { 102 struct device *dev = &pdev->dev; 103 struct usbhs_omap_platform_data *pdata = dev->platform_data; 104 struct resource *res; 105 struct usb_hcd *hcd; 106 void __iomem *regs; 107 int ret = -ENODEV; 108 int irq; 109 int i; 110 struct omap_hcd *omap; 111 112 if (usb_disabled()) 113 return -ENODEV; 114 115 if (!dev->parent) { 116 dev_err(dev, "Missing parent device\n"); 117 return -ENODEV; 118 } 119 120 /* For DT boot, get platform data from parent. i.e. usbhshost */ 121 if (dev->of_node) { 122 pdata = dev->parent->platform_data; 123 dev->platform_data = pdata; 124 } 125 126 if (!pdata) { 127 dev_err(dev, "Missing platform data\n"); 128 return -ENODEV; 129 } 130 131 irq = platform_get_irq(pdev, 0); 132 if (irq < 0) { 133 dev_err(dev, "EHCI irq failed\n"); 134 return -ENODEV; 135 } 136 137 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 138 regs = devm_ioremap_resource(dev, res); 139 if (IS_ERR(regs)) 140 return PTR_ERR(regs); 141 142 /* 143 * Right now device-tree probed devices don't get dma_mask set. 144 * Since shared usb code relies on it, set it here for now. 145 * Once we have dma capability bindings this can go away. 146 */ 147 if (!dev->dma_mask) 148 dev->dma_mask = &dev->coherent_dma_mask; 149 if (!dev->coherent_dma_mask) 150 dev->coherent_dma_mask = DMA_BIT_MASK(32); 151 152 hcd = usb_create_hcd(&ehci_omap_hc_driver, dev, 153 dev_name(dev)); 154 if (!hcd) { 155 dev_err(dev, "Failed to create HCD\n"); 156 return -ENOMEM; 157 } 158 159 hcd->rsrc_start = res->start; 160 hcd->rsrc_len = resource_size(res); 161 hcd->regs = regs; 162 hcd_to_ehci(hcd)->caps = regs; 163 164 omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv; 165 omap->nports = pdata->nports; 166 167 platform_set_drvdata(pdev, hcd); 168 169 /* get the PHY devices if needed */ 170 for (i = 0 ; i < omap->nports ; i++) { 171 struct usb_phy *phy; 172 173 /* get the PHY device */ 174 if (dev->of_node) 175 phy = devm_usb_get_phy_by_phandle(dev, "phys", i); 176 else 177 phy = devm_usb_get_phy_dev(dev, i); 178 if (IS_ERR(phy)) { 179 /* Don't bail out if PHY is not absolutely necessary */ 180 if (pdata->port_mode[i] != OMAP_EHCI_PORT_MODE_PHY) 181 continue; 182 183 ret = PTR_ERR(phy); 184 dev_err(dev, "Can't get PHY device for port %d: %d\n", 185 i, ret); 186 goto err_phy; 187 } 188 189 omap->phy[i] = phy; 190 191 if (pdata->port_mode[i] == OMAP_EHCI_PORT_MODE_PHY) { 192 usb_phy_init(omap->phy[i]); 193 /* bring PHY out of suspend */ 194 usb_phy_set_suspend(omap->phy[i], 0); 195 } 196 } 197 198 pm_runtime_enable(dev); 199 pm_runtime_get_sync(dev); 200 201 /* 202 * An undocumented "feature" in the OMAP3 EHCI controller, 203 * causes suspended ports to be taken out of suspend when 204 * the USBCMD.Run/Stop bit is cleared (for example when 205 * we do ehci_bus_suspend). 206 * This breaks suspend-resume if the root-hub is allowed 207 * to suspend. Writing 1 to this undocumented register bit 208 * disables this feature and restores normal behavior. 209 */ 210 ehci_write(regs, EHCI_INSNREG04, 211 EHCI_INSNREG04_DISABLE_UNSUSPEND); 212 213 ret = usb_add_hcd(hcd, irq, IRQF_SHARED); 214 if (ret) { 215 dev_err(dev, "failed to add hcd with err %d\n", ret); 216 goto err_pm_runtime; 217 } 218 219 /* 220 * Bring PHYs out of reset for non PHY modes. 221 * Even though HSIC mode is a PHY-less mode, the reset 222 * line exists between the chips and can be modelled 223 * as a PHY device for reset control. 224 */ 225 for (i = 0; i < omap->nports; i++) { 226 if (!omap->phy[i] || 227 pdata->port_mode[i] == OMAP_EHCI_PORT_MODE_PHY) 228 continue; 229 230 usb_phy_init(omap->phy[i]); 231 /* bring PHY out of suspend */ 232 usb_phy_set_suspend(omap->phy[i], 0); 233 } 234 235 return 0; 236 237 err_pm_runtime: 238 pm_runtime_put_sync(dev); 239 240 err_phy: 241 for (i = 0; i < omap->nports; i++) { 242 if (omap->phy[i]) 243 usb_phy_shutdown(omap->phy[i]); 244 } 245 246 usb_put_hcd(hcd); 247 248 return ret; 249 } 250 251 252 /** 253 * ehci_hcd_omap_remove - shutdown processing for EHCI HCDs 254 * @pdev: USB Host Controller being removed 255 * 256 * Reverses the effect of usb_ehci_hcd_omap_probe(), first invoking 257 * the HCD's stop() method. It is always called from a thread 258 * context, normally "rmmod", "apmd", or something similar. 259 */ 260 static int ehci_hcd_omap_remove(struct platform_device *pdev) 261 { 262 struct device *dev = &pdev->dev; 263 struct usb_hcd *hcd = dev_get_drvdata(dev); 264 struct omap_hcd *omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv; 265 int i; 266 267 usb_remove_hcd(hcd); 268 269 for (i = 0; i < omap->nports; i++) { 270 if (omap->phy[i]) 271 usb_phy_shutdown(omap->phy[i]); 272 } 273 274 usb_put_hcd(hcd); 275 pm_runtime_put_sync(dev); 276 pm_runtime_disable(dev); 277 278 return 0; 279 } 280 281 static void ehci_hcd_omap_shutdown(struct platform_device *pdev) 282 { 283 struct usb_hcd *hcd = dev_get_drvdata(&pdev->dev); 284 285 if (hcd->driver->shutdown) 286 hcd->driver->shutdown(hcd); 287 } 288 289 static const struct of_device_id omap_ehci_dt_ids[] = { 290 { .compatible = "ti,ehci-omap" }, 291 { } 292 }; 293 294 MODULE_DEVICE_TABLE(of, omap_ehci_dt_ids); 295 296 static struct platform_driver ehci_hcd_omap_driver = { 297 .probe = ehci_hcd_omap_probe, 298 .remove = ehci_hcd_omap_remove, 299 .shutdown = ehci_hcd_omap_shutdown, 300 /*.suspend = ehci_hcd_omap_suspend, */ 301 /*.resume = ehci_hcd_omap_resume, */ 302 .driver = { 303 .name = hcd_name, 304 .of_match_table = omap_ehci_dt_ids, 305 } 306 }; 307 308 /*-------------------------------------------------------------------------*/ 309 310 static int __init ehci_omap_init(void) 311 { 312 if (usb_disabled()) 313 return -ENODEV; 314 315 pr_info("%s: " DRIVER_DESC "\n", hcd_name); 316 317 ehci_init_driver(&ehci_omap_hc_driver, &ehci_omap_overrides); 318 return platform_driver_register(&ehci_hcd_omap_driver); 319 } 320 module_init(ehci_omap_init); 321 322 static void __exit ehci_omap_cleanup(void) 323 { 324 platform_driver_unregister(&ehci_hcd_omap_driver); 325 } 326 module_exit(ehci_omap_cleanup); 327 328 MODULE_ALIAS("platform:ehci-omap"); 329 MODULE_AUTHOR("Texas Instruments, Inc."); 330 MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>"); 331 MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>"); 332 333 MODULE_DESCRIPTION(DRIVER_DESC); 334 MODULE_LICENSE("GPL"); 335