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 .relinquish_port = ehci_relinquish_port, 80 .port_handed_over = ehci_port_handed_over, 81 }; 82 83 84 /* 85 * 440EPx Errata USBH_3 86 * Fix: Enable Break Memory Transfer (BMT) in INSNREG3 87 */ 88 #define PPC440EPX_EHCI0_INSREG_BMT (0x1 << 0) 89 static int __devinit 90 ppc44x_enable_bmt(struct device_node *dn) 91 { 92 __iomem u32 *insreg_virt; 93 94 insreg_virt = of_iomap(dn, 1); 95 if (!insreg_virt) 96 return -EINVAL; 97 98 out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT); 99 100 iounmap(insreg_virt); 101 return 0; 102 } 103 104 105 static int __devinit 106 ehci_hcd_ppc_of_probe(struct of_device *op, const struct of_device_id *match) 107 { 108 struct device_node *dn = op->node; 109 struct usb_hcd *hcd; 110 struct ehci_hcd *ehci; 111 struct resource res; 112 int irq; 113 int rv; 114 115 if (usb_disabled()) 116 return -ENODEV; 117 118 dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n"); 119 120 rv = of_address_to_resource(dn, 0, &res); 121 if (rv) 122 return rv; 123 124 hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB"); 125 if (!hcd) 126 return -ENOMEM; 127 128 hcd->rsrc_start = res.start; 129 hcd->rsrc_len = res.end - res.start + 1; 130 131 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { 132 printk(KERN_ERR __FILE__ ": request_mem_region failed\n"); 133 rv = -EBUSY; 134 goto err_rmr; 135 } 136 137 irq = irq_of_parse_and_map(dn, 0); 138 if (irq == NO_IRQ) { 139 printk(KERN_ERR __FILE__ ": irq_of_parse_and_map failed\n"); 140 rv = -EBUSY; 141 goto err_irq; 142 } 143 144 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); 145 if (!hcd->regs) { 146 printk(KERN_ERR __FILE__ ": ioremap failed\n"); 147 rv = -ENOMEM; 148 goto err_ioremap; 149 } 150 151 ehci = hcd_to_ehci(hcd); 152 153 if (of_get_property(dn, "big-endian", NULL)) { 154 ehci->big_endian_mmio = 1; 155 ehci->big_endian_desc = 1; 156 } 157 if (of_get_property(dn, "big-endian-regs", NULL)) 158 ehci->big_endian_mmio = 1; 159 if (of_get_property(dn, "big-endian-desc", NULL)) 160 ehci->big_endian_desc = 1; 161 162 ehci->caps = hcd->regs; 163 ehci->regs = hcd->regs + 164 HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase)); 165 166 /* cache this readonly data; minimize chip reads */ 167 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); 168 169 if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) { 170 rv = ppc44x_enable_bmt(dn); 171 ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n", 172 rv ? "NOT ": ""); 173 } 174 175 rv = usb_add_hcd(hcd, irq, 0); 176 if (rv == 0) 177 return 0; 178 179 iounmap(hcd->regs); 180 err_ioremap: 181 irq_dispose_mapping(irq); 182 err_irq: 183 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 184 err_rmr: 185 usb_put_hcd(hcd); 186 187 return rv; 188 } 189 190 191 static int ehci_hcd_ppc_of_remove(struct of_device *op) 192 { 193 struct usb_hcd *hcd = dev_get_drvdata(&op->dev); 194 dev_set_drvdata(&op->dev, NULL); 195 196 dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n"); 197 198 usb_remove_hcd(hcd); 199 200 iounmap(hcd->regs); 201 irq_dispose_mapping(hcd->irq); 202 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 203 204 usb_put_hcd(hcd); 205 206 return 0; 207 } 208 209 210 static int ehci_hcd_ppc_of_shutdown(struct of_device *op) 211 { 212 struct usb_hcd *hcd = dev_get_drvdata(&op->dev); 213 214 if (hcd->driver->shutdown) 215 hcd->driver->shutdown(hcd); 216 217 return 0; 218 } 219 220 221 static struct of_device_id ehci_hcd_ppc_of_match[] = { 222 { 223 .compatible = "usb-ehci", 224 }, 225 {}, 226 }; 227 MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match); 228 229 230 static struct of_platform_driver ehci_hcd_ppc_of_driver = { 231 .name = "ppc-of-ehci", 232 .match_table = ehci_hcd_ppc_of_match, 233 .probe = ehci_hcd_ppc_of_probe, 234 .remove = ehci_hcd_ppc_of_remove, 235 .shutdown = ehci_hcd_ppc_of_shutdown, 236 .driver = { 237 .name = "ppc-of-ehci", 238 .owner = THIS_MODULE, 239 }, 240 }; 241