1 /* 2 * EHCI HCD (Host Controller Driver) for USB. 3 * 4 * Bus Glue for PPC On-Chip EHCI driver on the of_platform bus 5 * Tested on AMCC PPC 440EPx 6 * 7 * Valentine Barshak <vbarshak@ru.mvista.com> 8 * 9 * Based on "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de> 10 * and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com> 11 * 12 * This file is licenced under the GPL. 13 */ 14 15 #include <linux/signal.h> 16 17 #include <linux/of.h> 18 #include <linux/of_platform.h> 19 20 /* called during probe() after chip reset completes */ 21 static int ehci_ppc_of_setup(struct usb_hcd *hcd) 22 { 23 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 24 int retval; 25 26 retval = ehci_halt(ehci); 27 if (retval) 28 return retval; 29 30 retval = ehci_init(hcd); 31 if (retval) 32 return retval; 33 34 ehci->sbrn = 0x20; 35 return ehci_reset(ehci); 36 } 37 38 39 static const struct hc_driver ehci_ppc_of_hc_driver = { 40 .description = hcd_name, 41 .product_desc = "OF EHCI", 42 .hcd_priv_size = sizeof(struct ehci_hcd), 43 44 /* 45 * generic hardware linkage 46 */ 47 .irq = ehci_irq, 48 .flags = HCD_MEMORY | HCD_USB2, 49 50 /* 51 * basic lifecycle operations 52 */ 53 .reset = ehci_ppc_of_setup, 54 .start = ehci_run, 55 .stop = ehci_stop, 56 .shutdown = ehci_shutdown, 57 58 /* 59 * managing i/o requests and associated device resources 60 */ 61 .urb_enqueue = ehci_urb_enqueue, 62 .urb_dequeue = ehci_urb_dequeue, 63 .endpoint_disable = ehci_endpoint_disable, 64 65 /* 66 * scheduling support 67 */ 68 .get_frame_number = ehci_get_frame, 69 70 /* 71 * root hub support 72 */ 73 .hub_status_data = ehci_hub_status_data, 74 .hub_control = ehci_hub_control, 75 #ifdef CONFIG_PM 76 .bus_suspend = ehci_bus_suspend, 77 .bus_resume = ehci_bus_resume, 78 #endif 79 }; 80 81 82 /* 83 * 440EPx Errata USBH_3 84 * Fix: Enable Break Memory Transfer (BMT) in INSNREG3 85 */ 86 #define PPC440EPX_EHCI0_INSREG_BMT (0x1 << 0) 87 static int __devinit 88 ppc44x_enable_bmt(struct device_node *dn) 89 { 90 __iomem u32 *insreg_virt; 91 92 insreg_virt = of_iomap(dn, 1); 93 if (!insreg_virt) 94 return -EINVAL; 95 96 out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT); 97 98 iounmap(insreg_virt); 99 return 0; 100 } 101 102 103 static int __devinit 104 ehci_hcd_ppc_of_probe(struct of_device *op, const struct of_device_id *match) 105 { 106 struct device_node *dn = op->node; 107 struct usb_hcd *hcd; 108 struct ehci_hcd *ehci; 109 struct resource res; 110 int irq; 111 int rv; 112 113 if (usb_disabled()) 114 return -ENODEV; 115 116 dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n"); 117 118 rv = of_address_to_resource(dn, 0, &res); 119 if (rv) 120 return rv; 121 122 hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB"); 123 if (!hcd) 124 return -ENOMEM; 125 126 hcd->rsrc_start = res.start; 127 hcd->rsrc_len = res.end - res.start + 1; 128 129 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { 130 printk(KERN_ERR __FILE__ ": request_mem_region failed\n"); 131 rv = -EBUSY; 132 goto err_rmr; 133 } 134 135 irq = irq_of_parse_and_map(dn, 0); 136 if (irq == NO_IRQ) { 137 printk(KERN_ERR __FILE__ ": irq_of_parse_and_map failed\n"); 138 rv = -EBUSY; 139 goto err_irq; 140 } 141 142 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); 143 if (!hcd->regs) { 144 printk(KERN_ERR __FILE__ ": ioremap failed\n"); 145 rv = -ENOMEM; 146 goto err_ioremap; 147 } 148 149 ehci = hcd_to_ehci(hcd); 150 151 if (of_get_property(dn, "big-endian", NULL)) { 152 ehci->big_endian_mmio = 1; 153 ehci->big_endian_desc = 1; 154 } 155 if (of_get_property(dn, "big-endian-regs", NULL)) 156 ehci->big_endian_mmio = 1; 157 if (of_get_property(dn, "big-endian-desc", NULL)) 158 ehci->big_endian_desc = 1; 159 160 ehci->caps = hcd->regs; 161 ehci->regs = hcd->regs + 162 HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase)); 163 164 /* cache this readonly data; minimize chip reads */ 165 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); 166 167 if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) { 168 rv = ppc44x_enable_bmt(dn); 169 ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n", 170 rv ? "NOT ": ""); 171 } 172 173 rv = usb_add_hcd(hcd, irq, 0); 174 if (rv == 0) 175 return 0; 176 177 iounmap(hcd->regs); 178 err_ioremap: 179 irq_dispose_mapping(irq); 180 err_irq: 181 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 182 err_rmr: 183 usb_put_hcd(hcd); 184 185 return rv; 186 } 187 188 189 static int ehci_hcd_ppc_of_remove(struct of_device *op) 190 { 191 struct usb_hcd *hcd = dev_get_drvdata(&op->dev); 192 dev_set_drvdata(&op->dev, NULL); 193 194 dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n"); 195 196 usb_remove_hcd(hcd); 197 198 iounmap(hcd->regs); 199 irq_dispose_mapping(hcd->irq); 200 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 201 202 usb_put_hcd(hcd); 203 204 return 0; 205 } 206 207 208 static int ehci_hcd_ppc_of_shutdown(struct of_device *op) 209 { 210 struct usb_hcd *hcd = dev_get_drvdata(&op->dev); 211 212 if (hcd->driver->shutdown) 213 hcd->driver->shutdown(hcd); 214 215 return 0; 216 } 217 218 219 static struct of_device_id ehci_hcd_ppc_of_match[] = { 220 { 221 .compatible = "usb-ehci", 222 }, 223 {}, 224 }; 225 MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match); 226 227 228 static struct of_platform_driver ehci_hcd_ppc_of_driver = { 229 .name = "ppc-of-ehci", 230 .match_table = ehci_hcd_ppc_of_match, 231 .probe = ehci_hcd_ppc_of_probe, 232 .remove = ehci_hcd_ppc_of_remove, 233 .shutdown = ehci_hcd_ppc_of_shutdown, 234 .driver = { 235 .name = "ppc-of-ehci", 236 .owner = THIS_MODULE, 237 }, 238 }; 239