1 /* 2 * OHCI HCD (Host Controller Driver) for USB. 3 * 4 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> 5 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net> 6 * (C) Copyright 2002 Hewlett-Packard Company 7 * 8 * Bus Glue for pxa27x 9 * 10 * Written by Christopher Hoover <ch@hpl.hp.com> 11 * Based on fragments of previous driver by Russell King et al. 12 * 13 * Modified for LH7A404 from ohci-sa1111.c 14 * by Durgesh Pattamatta <pattamattad@sharpsec.com> 15 * 16 * Modified for pxa27x from ohci-lh7a404.c 17 * by Nick Bane <nick@cecomputing.co.uk> 26-8-2004 18 * 19 * This file is licenced under the GPL. 20 */ 21 22 #include <linux/device.h> 23 #include <linux/signal.h> 24 #include <linux/platform_device.h> 25 #include <linux/clk.h> 26 27 #include <asm/mach-types.h> 28 #include <asm/hardware.h> 29 #include <asm/arch/pxa-regs.h> 30 #include <asm/arch/ohci.h> 31 32 #define PXA_UHC_MAX_PORTNUM 3 33 34 #define UHCRHPS(x) __REG2( 0x4C000050, (x)<<2 ) 35 36 static struct clk *usb_clk; 37 38 /* 39 PMM_NPS_MODE -- PMM Non-power switching mode 40 Ports are powered continuously. 41 42 PMM_GLOBAL_MODE -- PMM global switching mode 43 All ports are powered at the same time. 44 45 PMM_PERPORT_MODE -- PMM per port switching mode 46 Ports are powered individually. 47 */ 48 static int pxa27x_ohci_select_pmm( int mode ) 49 { 50 switch ( mode ) { 51 case PMM_NPS_MODE: 52 UHCRHDA |= RH_A_NPS; 53 break; 54 case PMM_GLOBAL_MODE: 55 UHCRHDA &= ~(RH_A_NPS & RH_A_PSM); 56 break; 57 case PMM_PERPORT_MODE: 58 UHCRHDA &= ~(RH_A_NPS); 59 UHCRHDA |= RH_A_PSM; 60 61 /* Set port power control mask bits, only 3 ports. */ 62 UHCRHDB |= (0x7<<17); 63 break; 64 default: 65 printk( KERN_ERR 66 "Invalid mode %d, set to non-power switch mode.\n", 67 mode ); 68 69 UHCRHDA |= RH_A_NPS; 70 } 71 72 return 0; 73 } 74 75 extern int usb_disabled(void); 76 77 /*-------------------------------------------------------------------------*/ 78 79 static int pxa27x_start_hc(struct device *dev) 80 { 81 int retval = 0; 82 struct pxaohci_platform_data *inf; 83 84 inf = dev->platform_data; 85 86 clk_enable(usb_clk); 87 88 UHCHR |= UHCHR_FHR; 89 udelay(11); 90 UHCHR &= ~UHCHR_FHR; 91 92 UHCHR |= UHCHR_FSBIR; 93 while (UHCHR & UHCHR_FSBIR) 94 cpu_relax(); 95 96 if (inf->init) 97 retval = inf->init(dev); 98 99 if (retval < 0) 100 return retval; 101 102 UHCHR &= ~UHCHR_SSE; 103 104 UHCHIE = (UHCHIE_UPRIE | UHCHIE_RWIE); 105 106 /* Clear any OTG Pin Hold */ 107 if (PSSR & PSSR_OTGPH) 108 PSSR |= PSSR_OTGPH; 109 110 return 0; 111 } 112 113 static void pxa27x_stop_hc(struct device *dev) 114 { 115 struct pxaohci_platform_data *inf; 116 117 inf = dev->platform_data; 118 119 if (inf->exit) 120 inf->exit(dev); 121 122 UHCHR |= UHCHR_FHR; 123 udelay(11); 124 UHCHR &= ~UHCHR_FHR; 125 126 UHCCOMS |= 1; 127 udelay(10); 128 129 clk_disable(usb_clk); 130 } 131 132 133 /*-------------------------------------------------------------------------*/ 134 135 /* configure so an HC device and id are always provided */ 136 /* always called with process context; sleeping is OK */ 137 138 139 /** 140 * usb_hcd_pxa27x_probe - initialize pxa27x-based HCDs 141 * Context: !in_interrupt() 142 * 143 * Allocates basic resources for this USB host controller, and 144 * then invokes the start() method for the HCD associated with it 145 * through the hotplug entry's driver_data. 146 * 147 */ 148 int usb_hcd_pxa27x_probe (const struct hc_driver *driver, struct platform_device *pdev) 149 { 150 int retval; 151 struct usb_hcd *hcd; 152 struct pxaohci_platform_data *inf; 153 154 inf = pdev->dev.platform_data; 155 156 if (!inf) 157 return -ENODEV; 158 159 if (pdev->resource[1].flags != IORESOURCE_IRQ) { 160 pr_debug ("resource[1] is not IORESOURCE_IRQ"); 161 return -ENOMEM; 162 } 163 164 usb_clk = clk_get(&pdev->dev, "USBCLK"); 165 if (IS_ERR(usb_clk)) 166 return PTR_ERR(usb_clk); 167 168 hcd = usb_create_hcd (driver, &pdev->dev, "pxa27x"); 169 if (!hcd) 170 return -ENOMEM; 171 hcd->rsrc_start = pdev->resource[0].start; 172 hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1; 173 174 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { 175 pr_debug("request_mem_region failed"); 176 retval = -EBUSY; 177 goto err1; 178 } 179 180 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); 181 if (!hcd->regs) { 182 pr_debug("ioremap failed"); 183 retval = -ENOMEM; 184 goto err2; 185 } 186 187 if ((retval = pxa27x_start_hc(&pdev->dev)) < 0) { 188 pr_debug("pxa27x_start_hc failed"); 189 goto err3; 190 } 191 192 /* Select Power Management Mode */ 193 pxa27x_ohci_select_pmm(inf->port_mode); 194 195 if (inf->power_budget) 196 hcd->power_budget = inf->power_budget; 197 198 ohci_hcd_init(hcd_to_ohci(hcd)); 199 200 retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED); 201 if (retval == 0) 202 return retval; 203 204 pxa27x_stop_hc(&pdev->dev); 205 err3: 206 iounmap(hcd->regs); 207 err2: 208 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 209 err1: 210 usb_put_hcd(hcd); 211 clk_put(usb_clk); 212 return retval; 213 } 214 215 216 /* may be called without controller electrically present */ 217 /* may be called with controller, bus, and devices active */ 218 219 /** 220 * usb_hcd_pxa27x_remove - shutdown processing for pxa27x-based HCDs 221 * @dev: USB Host Controller being removed 222 * Context: !in_interrupt() 223 * 224 * Reverses the effect of usb_hcd_pxa27x_probe(), first invoking 225 * the HCD's stop() method. It is always called from a thread 226 * context, normally "rmmod", "apmd", or something similar. 227 * 228 */ 229 void usb_hcd_pxa27x_remove (struct usb_hcd *hcd, struct platform_device *pdev) 230 { 231 usb_remove_hcd(hcd); 232 pxa27x_stop_hc(&pdev->dev); 233 iounmap(hcd->regs); 234 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 235 usb_put_hcd(hcd); 236 clk_put(usb_clk); 237 } 238 239 /*-------------------------------------------------------------------------*/ 240 241 static int __devinit 242 ohci_pxa27x_start (struct usb_hcd *hcd) 243 { 244 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 245 int ret; 246 247 ohci_dbg (ohci, "ohci_pxa27x_start, ohci:%p", ohci); 248 249 /* The value of NDP in roothub_a is incorrect on this hardware */ 250 ohci->num_ports = 3; 251 252 if ((ret = ohci_init(ohci)) < 0) 253 return ret; 254 255 if ((ret = ohci_run (ohci)) < 0) { 256 err ("can't start %s", hcd->self.bus_name); 257 ohci_stop (hcd); 258 return ret; 259 } 260 261 return 0; 262 } 263 264 /*-------------------------------------------------------------------------*/ 265 266 static const struct hc_driver ohci_pxa27x_hc_driver = { 267 .description = hcd_name, 268 .product_desc = "PXA27x OHCI", 269 .hcd_priv_size = sizeof(struct ohci_hcd), 270 271 /* 272 * generic hardware linkage 273 */ 274 .irq = ohci_irq, 275 .flags = HCD_USB11 | HCD_MEMORY, 276 277 /* 278 * basic lifecycle operations 279 */ 280 .start = ohci_pxa27x_start, 281 .stop = ohci_stop, 282 .shutdown = ohci_shutdown, 283 284 /* 285 * managing i/o requests and associated device resources 286 */ 287 .urb_enqueue = ohci_urb_enqueue, 288 .urb_dequeue = ohci_urb_dequeue, 289 .endpoint_disable = ohci_endpoint_disable, 290 291 /* 292 * scheduling support 293 */ 294 .get_frame_number = ohci_get_frame, 295 296 /* 297 * root hub support 298 */ 299 .hub_status_data = ohci_hub_status_data, 300 .hub_control = ohci_hub_control, 301 .hub_irq_enable = ohci_rhsc_enable, 302 #ifdef CONFIG_PM 303 .bus_suspend = ohci_bus_suspend, 304 .bus_resume = ohci_bus_resume, 305 #endif 306 .start_port_reset = ohci_start_port_reset, 307 }; 308 309 /*-------------------------------------------------------------------------*/ 310 311 static int ohci_hcd_pxa27x_drv_probe(struct platform_device *pdev) 312 { 313 pr_debug ("In ohci_hcd_pxa27x_drv_probe"); 314 315 if (usb_disabled()) 316 return -ENODEV; 317 318 return usb_hcd_pxa27x_probe(&ohci_pxa27x_hc_driver, pdev); 319 } 320 321 static int ohci_hcd_pxa27x_drv_remove(struct platform_device *pdev) 322 { 323 struct usb_hcd *hcd = platform_get_drvdata(pdev); 324 325 usb_hcd_pxa27x_remove(hcd, pdev); 326 platform_set_drvdata(pdev, NULL); 327 return 0; 328 } 329 330 #ifdef CONFIG_PM 331 static int ohci_hcd_pxa27x_drv_suspend(struct platform_device *pdev, pm_message_t state) 332 { 333 struct usb_hcd *hcd = platform_get_drvdata(pdev); 334 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 335 336 if (time_before(jiffies, ohci->next_statechange)) 337 msleep(5); 338 ohci->next_statechange = jiffies; 339 340 pxa27x_stop_hc(&pdev->dev); 341 hcd->state = HC_STATE_SUSPENDED; 342 pdev->dev.power.power_state = PMSG_SUSPEND; 343 344 return 0; 345 } 346 347 static int ohci_hcd_pxa27x_drv_resume(struct platform_device *pdev) 348 { 349 struct usb_hcd *hcd = platform_get_drvdata(pdev); 350 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 351 int status; 352 353 if (time_before(jiffies, ohci->next_statechange)) 354 msleep(5); 355 ohci->next_statechange = jiffies; 356 357 if ((status = pxa27x_start_hc(&pdev->dev)) < 0) 358 return status; 359 360 pdev->dev.power.power_state = PMSG_ON; 361 usb_hcd_resume_root_hub(hcd); 362 363 return 0; 364 } 365 #endif 366 367 /* work with hotplug and coldplug */ 368 MODULE_ALIAS("platform:pxa27x-ohci"); 369 370 static struct platform_driver ohci_hcd_pxa27x_driver = { 371 .probe = ohci_hcd_pxa27x_drv_probe, 372 .remove = ohci_hcd_pxa27x_drv_remove, 373 .shutdown = usb_hcd_platform_shutdown, 374 #ifdef CONFIG_PM 375 .suspend = ohci_hcd_pxa27x_drv_suspend, 376 .resume = ohci_hcd_pxa27x_drv_resume, 377 #endif 378 .driver = { 379 .name = "pxa27x-ohci", 380 .owner = THIS_MODULE, 381 }, 382 }; 383 384