1 /* 2 * OHCI HCD (Host Controller Driver) for USB. 3 * 4 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> 5 * (C) Copyright 2000-2005 David Brownell 6 * (C) Copyright 2002 Hewlett-Packard Company 7 * (C) Copyright 2008 Magnus Damm 8 * 9 * SM501 Bus Glue - based on ohci-omap.c 10 * 11 * This file is licenced under the GPL. 12 */ 13 14 #include <linux/interrupt.h> 15 #include <linux/jiffies.h> 16 #include <linux/platform_device.h> 17 #include <linux/dma-mapping.h> 18 #include <linux/sm501.h> 19 #include <linux/sm501-regs.h> 20 21 static int ohci_sm501_init(struct usb_hcd *hcd) 22 { 23 return ohci_init(hcd_to_ohci(hcd)); 24 } 25 26 static int ohci_sm501_start(struct usb_hcd *hcd) 27 { 28 struct device *dev = hcd->self.controller; 29 int ret; 30 31 ret = ohci_run(hcd_to_ohci(hcd)); 32 if (ret < 0) { 33 dev_err(dev, "can't start %s", hcd->self.bus_name); 34 ohci_stop(hcd); 35 } 36 37 return ret; 38 } 39 40 /*-------------------------------------------------------------------------*/ 41 42 static const struct hc_driver ohci_sm501_hc_driver = { 43 .description = hcd_name, 44 .product_desc = "SM501 OHCI", 45 .hcd_priv_size = sizeof(struct ohci_hcd), 46 47 /* 48 * generic hardware linkage 49 */ 50 .irq = ohci_irq, 51 .flags = HCD_USB11 | HCD_MEMORY | HCD_LOCAL_MEM, 52 53 /* 54 * basic lifecycle operations 55 */ 56 .reset = ohci_sm501_init, 57 .start = ohci_sm501_start, 58 .stop = ohci_stop, 59 .shutdown = ohci_shutdown, 60 61 /* 62 * managing i/o requests and associated device resources 63 */ 64 .urb_enqueue = ohci_urb_enqueue, 65 .urb_dequeue = ohci_urb_dequeue, 66 .endpoint_disable = ohci_endpoint_disable, 67 68 /* 69 * scheduling support 70 */ 71 .get_frame_number = ohci_get_frame, 72 73 /* 74 * root hub support 75 */ 76 .hub_status_data = ohci_hub_status_data, 77 .hub_control = ohci_hub_control, 78 #ifdef CONFIG_PM 79 .bus_suspend = ohci_bus_suspend, 80 .bus_resume = ohci_bus_resume, 81 #endif 82 .start_port_reset = ohci_start_port_reset, 83 }; 84 85 /*-------------------------------------------------------------------------*/ 86 87 static int ohci_hcd_sm501_drv_probe(struct platform_device *pdev) 88 { 89 const struct hc_driver *driver = &ohci_sm501_hc_driver; 90 struct device *dev = &pdev->dev; 91 struct resource *res, *mem; 92 int retval, irq; 93 struct usb_hcd *hcd = NULL; 94 95 irq = retval = platform_get_irq(pdev, 0); 96 if (retval < 0) 97 goto err0; 98 99 mem = platform_get_resource(pdev, IORESOURCE_MEM, 1); 100 if (mem == NULL) { 101 dev_err(dev, "no resource definition for memory\n"); 102 retval = -ENOENT; 103 goto err0; 104 } 105 106 if (!request_mem_region(mem->start, resource_size(mem), pdev->name)) { 107 dev_err(dev, "request_mem_region failed\n"); 108 retval = -EBUSY; 109 goto err0; 110 } 111 112 /* The sm501 chip is equipped with local memory that may be used 113 * by on-chip devices such as the video controller and the usb host. 114 * This driver uses dma_declare_coherent_memory() to make sure 115 * usb allocations with dma_alloc_coherent() allocate from 116 * this local memory. The dma_handle returned by dma_alloc_coherent() 117 * will be an offset starting from 0 for the first local memory byte. 118 * 119 * So as long as data is allocated using dma_alloc_coherent() all is 120 * fine. This is however not always the case - buffers may be allocated 121 * using kmalloc() - so the usb core needs to be told that it must copy 122 * data into our local memory if the buffers happen to be placed in 123 * regular memory. The HCD_LOCAL_MEM flag does just that. 124 */ 125 126 retval = dma_declare_coherent_memory(dev, mem->start, 127 mem->start - mem->parent->start, 128 resource_size(mem), 129 DMA_MEMORY_EXCLUSIVE); 130 if (retval) { 131 dev_err(dev, "cannot declare coherent memory\n"); 132 goto err1; 133 } 134 135 /* allocate, reserve and remap resources for registers */ 136 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 137 if (res == NULL) { 138 dev_err(dev, "no resource definition for registers\n"); 139 retval = -ENOENT; 140 goto err2; 141 } 142 143 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); 144 if (!hcd) { 145 retval = -ENOMEM; 146 goto err2; 147 } 148 149 hcd->rsrc_start = res->start; 150 hcd->rsrc_len = resource_size(res); 151 152 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, pdev->name)) { 153 dev_err(dev, "request_mem_region failed\n"); 154 retval = -EBUSY; 155 goto err3; 156 } 157 158 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); 159 if (hcd->regs == NULL) { 160 dev_err(dev, "cannot remap registers\n"); 161 retval = -ENXIO; 162 goto err4; 163 } 164 165 ohci_hcd_init(hcd_to_ohci(hcd)); 166 167 retval = usb_add_hcd(hcd, irq, IRQF_SHARED); 168 if (retval) 169 goto err5; 170 device_wakeup_enable(hcd->self.controller); 171 172 /* enable power and unmask interrupts */ 173 174 sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1); 175 sm501_modify_reg(dev->parent, SM501_IRQ_MASK, 1 << 6, 0); 176 177 return 0; 178 err5: 179 iounmap(hcd->regs); 180 err4: 181 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 182 err3: 183 usb_put_hcd(hcd); 184 err2: 185 dma_release_declared_memory(dev); 186 err1: 187 release_mem_region(mem->start, resource_size(mem)); 188 err0: 189 return retval; 190 } 191 192 static int ohci_hcd_sm501_drv_remove(struct platform_device *pdev) 193 { 194 struct usb_hcd *hcd = platform_get_drvdata(pdev); 195 struct resource *mem; 196 197 usb_remove_hcd(hcd); 198 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 199 usb_put_hcd(hcd); 200 dma_release_declared_memory(&pdev->dev); 201 mem = platform_get_resource(pdev, IORESOURCE_MEM, 1); 202 if (mem) 203 release_mem_region(mem->start, resource_size(mem)); 204 205 /* mask interrupts and disable power */ 206 207 sm501_modify_reg(pdev->dev.parent, SM501_IRQ_MASK, 0, 1 << 6); 208 sm501_unit_power(pdev->dev.parent, SM501_GATE_USB_HOST, 0); 209 210 return 0; 211 } 212 213 /*-------------------------------------------------------------------------*/ 214 215 #ifdef CONFIG_PM 216 static int ohci_sm501_suspend(struct platform_device *pdev, pm_message_t msg) 217 { 218 struct device *dev = &pdev->dev; 219 struct usb_hcd *hcd = platform_get_drvdata(pdev); 220 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 221 bool do_wakeup = device_may_wakeup(dev); 222 int ret; 223 224 if (time_before(jiffies, ohci->next_statechange)) 225 msleep(5); 226 ohci->next_statechange = jiffies; 227 228 ret = ohci_suspend(hcd, do_wakeup); 229 if (ret) 230 return ret; 231 232 sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 0); 233 return ret; 234 } 235 236 static int ohci_sm501_resume(struct platform_device *pdev) 237 { 238 struct device *dev = &pdev->dev; 239 struct usb_hcd *hcd = platform_get_drvdata(pdev); 240 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 241 242 if (time_before(jiffies, ohci->next_statechange)) 243 msleep(5); 244 ohci->next_statechange = jiffies; 245 246 sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1); 247 ohci_resume(hcd, false); 248 return 0; 249 } 250 #else 251 #define ohci_sm501_suspend NULL 252 #define ohci_sm501_resume NULL 253 #endif 254 255 /*-------------------------------------------------------------------------*/ 256 257 /* 258 * Driver definition to register with the SM501 bus 259 */ 260 static struct platform_driver ohci_hcd_sm501_driver = { 261 .probe = ohci_hcd_sm501_drv_probe, 262 .remove = ohci_hcd_sm501_drv_remove, 263 .shutdown = usb_hcd_platform_shutdown, 264 .suspend = ohci_sm501_suspend, 265 .resume = ohci_sm501_resume, 266 .driver = { 267 .name = "sm501-usb", 268 }, 269 }; 270 MODULE_ALIAS("platform:sm501-usb"); 271