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/pxa2xx-regs.h> /* FIXME: for PSSR */ 31 #include <asm/arch/ohci.h> 32 33 #define PXA_UHC_MAX_PORTNUM 3 34 35 #define UHCRHPS(x) __REG2( 0x4C000050, (x)<<2 ) 36 37 static struct clk *usb_clk; 38 39 /* 40 PMM_NPS_MODE -- PMM Non-power switching mode 41 Ports are powered continuously. 42 43 PMM_GLOBAL_MODE -- PMM global switching mode 44 All ports are powered at the same time. 45 46 PMM_PERPORT_MODE -- PMM per port switching mode 47 Ports are powered individually. 48 */ 49 static int pxa27x_ohci_select_pmm( int mode ) 50 { 51 switch ( mode ) { 52 case PMM_NPS_MODE: 53 UHCRHDA |= RH_A_NPS; 54 break; 55 case PMM_GLOBAL_MODE: 56 UHCRHDA &= ~(RH_A_NPS & RH_A_PSM); 57 break; 58 case PMM_PERPORT_MODE: 59 UHCRHDA &= ~(RH_A_NPS); 60 UHCRHDA |= RH_A_PSM; 61 62 /* Set port power control mask bits, only 3 ports. */ 63 UHCRHDB |= (0x7<<17); 64 break; 65 default: 66 printk( KERN_ERR 67 "Invalid mode %d, set to non-power switch mode.\n", 68 mode ); 69 70 UHCRHDA |= RH_A_NPS; 71 } 72 73 return 0; 74 } 75 76 extern int usb_disabled(void); 77 78 /*-------------------------------------------------------------------------*/ 79 80 static int pxa27x_start_hc(struct device *dev) 81 { 82 int retval = 0; 83 struct pxaohci_platform_data *inf; 84 85 inf = dev->platform_data; 86 87 clk_enable(usb_clk); 88 89 UHCHR |= UHCHR_FHR; 90 udelay(11); 91 UHCHR &= ~UHCHR_FHR; 92 93 UHCHR |= UHCHR_FSBIR; 94 while (UHCHR & UHCHR_FSBIR) 95 cpu_relax(); 96 97 if (inf->init) 98 retval = inf->init(dev); 99 100 if (retval < 0) 101 return retval; 102 103 UHCHR &= ~UHCHR_SSE; 104 105 UHCHIE = (UHCHIE_UPRIE | UHCHIE_RWIE); 106 107 /* Clear any OTG Pin Hold */ 108 if (cpu_is_pxa27x() && (PSSR & PSSR_OTGPH)) 109 PSSR |= PSSR_OTGPH; 110 111 return 0; 112 } 113 114 static void pxa27x_stop_hc(struct device *dev) 115 { 116 struct pxaohci_platform_data *inf; 117 118 inf = dev->platform_data; 119 120 if (inf->exit) 121 inf->exit(dev); 122 123 UHCHR |= UHCHR_FHR; 124 udelay(11); 125 UHCHR &= ~UHCHR_FHR; 126 127 UHCCOMS |= 1; 128 udelay(10); 129 130 clk_disable(usb_clk); 131 } 132 133 134 /*-------------------------------------------------------------------------*/ 135 136 /* configure so an HC device and id are always provided */ 137 /* always called with process context; sleeping is OK */ 138 139 140 /** 141 * usb_hcd_pxa27x_probe - initialize pxa27x-based HCDs 142 * Context: !in_interrupt() 143 * 144 * Allocates basic resources for this USB host controller, and 145 * then invokes the start() method for the HCD associated with it 146 * through the hotplug entry's driver_data. 147 * 148 */ 149 int usb_hcd_pxa27x_probe (const struct hc_driver *driver, struct platform_device *pdev) 150 { 151 int retval; 152 struct usb_hcd *hcd; 153 struct pxaohci_platform_data *inf; 154 155 inf = pdev->dev.platform_data; 156 157 if (!inf) 158 return -ENODEV; 159 160 if (pdev->resource[1].flags != IORESOURCE_IRQ) { 161 pr_debug ("resource[1] is not IORESOURCE_IRQ"); 162 return -ENOMEM; 163 } 164 165 usb_clk = clk_get(&pdev->dev, "USBCLK"); 166 if (IS_ERR(usb_clk)) 167 return PTR_ERR(usb_clk); 168 169 hcd = usb_create_hcd (driver, &pdev->dev, "pxa27x"); 170 if (!hcd) 171 return -ENOMEM; 172 hcd->rsrc_start = pdev->resource[0].start; 173 hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1; 174 175 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { 176 pr_debug("request_mem_region failed"); 177 retval = -EBUSY; 178 goto err1; 179 } 180 181 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); 182 if (!hcd->regs) { 183 pr_debug("ioremap failed"); 184 retval = -ENOMEM; 185 goto err2; 186 } 187 188 if ((retval = pxa27x_start_hc(&pdev->dev)) < 0) { 189 pr_debug("pxa27x_start_hc failed"); 190 goto err3; 191 } 192 193 /* Select Power Management Mode */ 194 pxa27x_ohci_select_pmm(inf->port_mode); 195 196 if (inf->power_budget) 197 hcd->power_budget = inf->power_budget; 198 199 ohci_hcd_init(hcd_to_ohci(hcd)); 200 201 retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED); 202 if (retval == 0) 203 return retval; 204 205 pxa27x_stop_hc(&pdev->dev); 206 err3: 207 iounmap(hcd->regs); 208 err2: 209 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 210 err1: 211 usb_put_hcd(hcd); 212 clk_put(usb_clk); 213 return retval; 214 } 215 216 217 /* may be called without controller electrically present */ 218 /* may be called with controller, bus, and devices active */ 219 220 /** 221 * usb_hcd_pxa27x_remove - shutdown processing for pxa27x-based HCDs 222 * @dev: USB Host Controller being removed 223 * Context: !in_interrupt() 224 * 225 * Reverses the effect of usb_hcd_pxa27x_probe(), first invoking 226 * the HCD's stop() method. It is always called from a thread 227 * context, normally "rmmod", "apmd", or something similar. 228 * 229 */ 230 void usb_hcd_pxa27x_remove (struct usb_hcd *hcd, struct platform_device *pdev) 231 { 232 usb_remove_hcd(hcd); 233 pxa27x_stop_hc(&pdev->dev); 234 iounmap(hcd->regs); 235 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 236 usb_put_hcd(hcd); 237 clk_put(usb_clk); 238 } 239 240 /*-------------------------------------------------------------------------*/ 241 242 static int __devinit 243 ohci_pxa27x_start (struct usb_hcd *hcd) 244 { 245 struct ohci_hcd *ohci = hcd_to_ohci (hcd); 246 int ret; 247 248 ohci_dbg (ohci, "ohci_pxa27x_start, ohci:%p", ohci); 249 250 /* The value of NDP in roothub_a is incorrect on this hardware */ 251 ohci->num_ports = 3; 252 253 if ((ret = ohci_init(ohci)) < 0) 254 return ret; 255 256 if ((ret = ohci_run (ohci)) < 0) { 257 err ("can't start %s", hcd->self.bus_name); 258 ohci_stop (hcd); 259 return ret; 260 } 261 262 return 0; 263 } 264 265 /*-------------------------------------------------------------------------*/ 266 267 static const struct hc_driver ohci_pxa27x_hc_driver = { 268 .description = hcd_name, 269 .product_desc = "PXA27x OHCI", 270 .hcd_priv_size = sizeof(struct ohci_hcd), 271 272 /* 273 * generic hardware linkage 274 */ 275 .irq = ohci_irq, 276 .flags = HCD_USB11 | HCD_MEMORY, 277 278 /* 279 * basic lifecycle operations 280 */ 281 .start = ohci_pxa27x_start, 282 .stop = ohci_stop, 283 .shutdown = ohci_shutdown, 284 285 /* 286 * managing i/o requests and associated device resources 287 */ 288 .urb_enqueue = ohci_urb_enqueue, 289 .urb_dequeue = ohci_urb_dequeue, 290 .endpoint_disable = ohci_endpoint_disable, 291 292 /* 293 * scheduling support 294 */ 295 .get_frame_number = ohci_get_frame, 296 297 /* 298 * root hub support 299 */ 300 .hub_status_data = ohci_hub_status_data, 301 .hub_control = ohci_hub_control, 302 .hub_irq_enable = ohci_rhsc_enable, 303 #ifdef CONFIG_PM 304 .bus_suspend = ohci_bus_suspend, 305 .bus_resume = ohci_bus_resume, 306 #endif 307 .start_port_reset = ohci_start_port_reset, 308 }; 309 310 /*-------------------------------------------------------------------------*/ 311 312 static int ohci_hcd_pxa27x_drv_probe(struct platform_device *pdev) 313 { 314 pr_debug ("In ohci_hcd_pxa27x_drv_probe"); 315 316 if (usb_disabled()) 317 return -ENODEV; 318 319 return usb_hcd_pxa27x_probe(&ohci_pxa27x_hc_driver, pdev); 320 } 321 322 static int ohci_hcd_pxa27x_drv_remove(struct platform_device *pdev) 323 { 324 struct usb_hcd *hcd = platform_get_drvdata(pdev); 325 326 usb_hcd_pxa27x_remove(hcd, pdev); 327 platform_set_drvdata(pdev, NULL); 328 return 0; 329 } 330 331 #ifdef CONFIG_PM 332 static int ohci_hcd_pxa27x_drv_suspend(struct platform_device *pdev, pm_message_t state) 333 { 334 struct usb_hcd *hcd = platform_get_drvdata(pdev); 335 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 336 337 if (time_before(jiffies, ohci->next_statechange)) 338 msleep(5); 339 ohci->next_statechange = jiffies; 340 341 pxa27x_stop_hc(&pdev->dev); 342 hcd->state = HC_STATE_SUSPENDED; 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 ohci_finish_controller_resume(hcd); 361 return 0; 362 } 363 #endif 364 365 /* work with hotplug and coldplug */ 366 MODULE_ALIAS("platform:pxa27x-ohci"); 367 368 static struct platform_driver ohci_hcd_pxa27x_driver = { 369 .probe = ohci_hcd_pxa27x_drv_probe, 370 .remove = ohci_hcd_pxa27x_drv_remove, 371 .shutdown = usb_hcd_platform_shutdown, 372 #ifdef CONFIG_PM 373 .suspend = ohci_hcd_pxa27x_drv_suspend, 374 .resume = ohci_hcd_pxa27x_drv_resume, 375 #endif 376 .driver = { 377 .name = "pxa27x-ohci", 378 .owner = THIS_MODULE, 379 }, 380 }; 381 382