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 .hub_irq_enable = ohci_rhsc_enable, 79 #ifdef CONFIG_PM 80 .bus_suspend = ohci_bus_suspend, 81 .bus_resume = ohci_bus_resume, 82 #endif 83 .start_port_reset = ohci_start_port_reset, 84 }; 85 86 /*-------------------------------------------------------------------------*/ 87 88 static int ohci_hcd_sm501_drv_probe(struct platform_device *pdev) 89 { 90 const struct hc_driver *driver = &ohci_sm501_hc_driver; 91 struct device *dev = &pdev->dev; 92 struct resource *res, *mem; 93 int retval, irq; 94 struct usb_hcd *hcd = 0; 95 96 irq = retval = platform_get_irq(pdev, 0); 97 if (retval < 0) 98 goto err0; 99 100 mem = platform_get_resource(pdev, IORESOURCE_MEM, 1); 101 if (mem == NULL) { 102 dev_err(dev, "no resource definition for memory\n"); 103 retval = -ENOENT; 104 goto err0; 105 } 106 107 if (!request_mem_region(mem->start, mem->end - mem->start + 1, 108 pdev->name)) { 109 dev_err(dev, "request_mem_region failed\n"); 110 retval = -EBUSY; 111 goto err0; 112 } 113 114 /* The sm501 chip is equipped with local memory that may be used 115 * by on-chip devices such as the video controller and the usb host. 116 * This driver uses dma_declare_coherent_memory() to make sure 117 * usb allocations with dma_alloc_coherent() allocate from 118 * this local memory. The dma_handle returned by dma_alloc_coherent() 119 * will be an offset starting from 0 for the first local memory byte. 120 * 121 * So as long as data is allocated using dma_alloc_coherent() all is 122 * fine. This is however not always the case - buffers may be allocated 123 * using kmalloc() - so the usb core needs to be told that it must copy 124 * data into our local memory if the buffers happen to be placed in 125 * regular memory. The HCD_LOCAL_MEM flag does just that. 126 */ 127 128 if (!dma_declare_coherent_memory(dev, mem->start, 129 mem->start - mem->parent->start, 130 (mem->end - mem->start) + 1, 131 DMA_MEMORY_MAP | 132 DMA_MEMORY_EXCLUSIVE)) { 133 dev_err(dev, "cannot declare coherent memory\n"); 134 retval = -ENXIO; 135 goto err1; 136 } 137 138 /* allocate, reserve and remap resources for registers */ 139 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 140 if (res == NULL) { 141 dev_err(dev, "no resource definition for registers\n"); 142 retval = -ENOENT; 143 goto err2; 144 } 145 146 hcd = usb_create_hcd(driver, &pdev->dev, pdev->dev.bus_id); 147 if (!hcd) { 148 retval = -ENOMEM; 149 goto err2; 150 } 151 152 hcd->rsrc_start = res->start; 153 hcd->rsrc_len = res->end - res->start + 1; 154 155 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, pdev->name)) { 156 dev_err(dev, "request_mem_region failed\n"); 157 retval = -EBUSY; 158 goto err3; 159 } 160 161 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); 162 if (hcd->regs == NULL) { 163 dev_err(dev, "cannot remap registers\n"); 164 retval = -ENXIO; 165 goto err4; 166 } 167 168 ohci_hcd_init(hcd_to_ohci(hcd)); 169 170 retval = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED); 171 if (retval) 172 goto err4; 173 174 /* enable power and unmask interrupts */ 175 176 sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1); 177 sm501_modify_reg(dev->parent, SM501_IRQ_MASK, 1 << 6, 0); 178 179 return 0; 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, mem->end - mem->start + 1); 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 release_mem_region(mem->start, mem->end - mem->start + 1); 203 204 /* mask interrupts and disable power */ 205 206 sm501_modify_reg(pdev->dev.parent, SM501_IRQ_MASK, 0, 1 << 6); 207 sm501_unit_power(pdev->dev.parent, SM501_GATE_USB_HOST, 0); 208 209 platform_set_drvdata(pdev, NULL); 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 ohci_hcd *ohci = hcd_to_ohci(platform_get_drvdata(pdev)); 220 221 if (time_before(jiffies, ohci->next_statechange)) 222 msleep(5); 223 ohci->next_statechange = jiffies; 224 225 sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 0); 226 ohci_to_hcd(ohci)->state = HC_STATE_SUSPENDED; 227 dev->power.power_state = PMSG_SUSPEND; 228 return 0; 229 } 230 231 static int ohci_sm501_resume(struct platform_device *pdev) 232 { 233 struct device *dev = &pdev->dev; 234 struct ohci_hcd *ohci = hcd_to_ohci(platform_get_drvdata(pdev)); 235 236 if (time_before(jiffies, ohci->next_statechange)) 237 msleep(5); 238 ohci->next_statechange = jiffies; 239 240 sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1); 241 dev->power.power_state = PMSG_ON; 242 usb_hcd_resume_root_hub(platform_get_drvdata(pdev)); 243 return 0; 244 } 245 #endif 246 247 /*-------------------------------------------------------------------------*/ 248 249 /* 250 * Driver definition to register with the SM501 bus 251 */ 252 static struct platform_driver ohci_hcd_sm501_driver = { 253 .probe = ohci_hcd_sm501_drv_probe, 254 .remove = ohci_hcd_sm501_drv_remove, 255 .shutdown = usb_hcd_platform_shutdown, 256 #ifdef CONFIG_PM 257 .suspend = ohci_sm501_suspend, 258 .resume = ohci_sm501_resume, 259 #endif 260 .driver = { 261 .owner = THIS_MODULE, 262 .name = "sm501-usb", 263 }, 264 }; 265