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 .endpoint_reset = ehci_endpoint_reset, 65 66 /* 67 * scheduling support 68 */ 69 .get_frame_number = ehci_get_frame, 70 71 /* 72 * root hub support 73 */ 74 .hub_status_data = ehci_hub_status_data, 75 .hub_control = ehci_hub_control, 76 #ifdef CONFIG_PM 77 .bus_suspend = ehci_bus_suspend, 78 .bus_resume = ehci_bus_resume, 79 #endif 80 .relinquish_port = ehci_relinquish_port, 81 .port_handed_over = ehci_port_handed_over, 82 83 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, 84 }; 85 86 87 /* 88 * 440EPx Errata USBH_3 89 * Fix: Enable Break Memory Transfer (BMT) in INSNREG3 90 */ 91 #define PPC440EPX_EHCI0_INSREG_BMT (0x1 << 0) 92 static int __devinit 93 ppc44x_enable_bmt(struct device_node *dn) 94 { 95 __iomem u32 *insreg_virt; 96 97 insreg_virt = of_iomap(dn, 1); 98 if (!insreg_virt) 99 return -EINVAL; 100 101 out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT); 102 103 iounmap(insreg_virt); 104 return 0; 105 } 106 107 108 static int __devinit 109 ehci_hcd_ppc_of_probe(struct of_device *op, const struct of_device_id *match) 110 { 111 struct device_node *dn = op->node; 112 struct usb_hcd *hcd; 113 struct ehci_hcd *ehci = NULL; 114 struct resource res; 115 int irq; 116 int rv; 117 118 struct device_node *np; 119 120 if (usb_disabled()) 121 return -ENODEV; 122 123 dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n"); 124 125 rv = of_address_to_resource(dn, 0, &res); 126 if (rv) 127 return rv; 128 129 hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB"); 130 if (!hcd) 131 return -ENOMEM; 132 133 hcd->rsrc_start = res.start; 134 hcd->rsrc_len = res.end - res.start + 1; 135 136 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { 137 printk(KERN_ERR __FILE__ ": request_mem_region failed\n"); 138 rv = -EBUSY; 139 goto err_rmr; 140 } 141 142 irq = irq_of_parse_and_map(dn, 0); 143 if (irq == NO_IRQ) { 144 printk(KERN_ERR __FILE__ ": irq_of_parse_and_map failed\n"); 145 rv = -EBUSY; 146 goto err_irq; 147 } 148 149 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); 150 if (!hcd->regs) { 151 printk(KERN_ERR __FILE__ ": ioremap failed\n"); 152 rv = -ENOMEM; 153 goto err_ioremap; 154 } 155 156 ehci = hcd_to_ehci(hcd); 157 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx"); 158 if (np != NULL) { 159 /* claim we really affected by usb23 erratum */ 160 if (!of_address_to_resource(np, 0, &res)) 161 ehci->ohci_hcctrl_reg = ioremap(res.start + 162 OHCI_HCCTRL_OFFSET, OHCI_HCCTRL_LEN); 163 else 164 pr_debug(__FILE__ ": no ohci offset in fdt\n"); 165 if (!ehci->ohci_hcctrl_reg) { 166 pr_debug(__FILE__ ": ioremap for ohci hcctrl failed\n"); 167 } else { 168 ehci->has_amcc_usb23 = 1; 169 } 170 } 171 172 if (of_get_property(dn, "big-endian", NULL)) { 173 ehci->big_endian_mmio = 1; 174 ehci->big_endian_desc = 1; 175 } 176 if (of_get_property(dn, "big-endian-regs", NULL)) 177 ehci->big_endian_mmio = 1; 178 if (of_get_property(dn, "big-endian-desc", NULL)) 179 ehci->big_endian_desc = 1; 180 181 ehci->caps = hcd->regs; 182 ehci->regs = hcd->regs + 183 HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase)); 184 185 /* cache this readonly data; minimize chip reads */ 186 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); 187 188 if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) { 189 rv = ppc44x_enable_bmt(dn); 190 ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n", 191 rv ? "NOT ": ""); 192 } 193 194 rv = usb_add_hcd(hcd, irq, 0); 195 if (rv == 0) 196 return 0; 197 198 iounmap(hcd->regs); 199 err_ioremap: 200 irq_dispose_mapping(irq); 201 err_irq: 202 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 203 204 if (ehci->has_amcc_usb23) 205 iounmap(ehci->ohci_hcctrl_reg); 206 err_rmr: 207 usb_put_hcd(hcd); 208 209 return rv; 210 } 211 212 213 static int ehci_hcd_ppc_of_remove(struct of_device *op) 214 { 215 struct usb_hcd *hcd = dev_get_drvdata(&op->dev); 216 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 217 218 struct device_node *np; 219 struct resource res; 220 221 dev_set_drvdata(&op->dev, NULL); 222 223 dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n"); 224 225 usb_remove_hcd(hcd); 226 227 iounmap(hcd->regs); 228 irq_dispose_mapping(hcd->irq); 229 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 230 231 /* use request_mem_region to test if the ohci driver is loaded. if so 232 * ensure the ohci core is operational. 233 */ 234 if (ehci->has_amcc_usb23) { 235 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx"); 236 if (np != NULL) { 237 if (!of_address_to_resource(np, 0, &res)) 238 if (!request_mem_region(res.start, 239 0x4, hcd_name)) 240 set_ohci_hcfs(ehci, 1); 241 else 242 release_mem_region(res.start, 0x4); 243 else 244 pr_debug(__FILE__ ": no ohci offset in fdt\n"); 245 of_node_put(np); 246 } 247 248 iounmap(ehci->ohci_hcctrl_reg); 249 } 250 usb_put_hcd(hcd); 251 252 return 0; 253 } 254 255 256 static int ehci_hcd_ppc_of_shutdown(struct of_device *op) 257 { 258 struct usb_hcd *hcd = dev_get_drvdata(&op->dev); 259 260 if (hcd->driver->shutdown) 261 hcd->driver->shutdown(hcd); 262 263 return 0; 264 } 265 266 267 static struct of_device_id ehci_hcd_ppc_of_match[] = { 268 { 269 .compatible = "usb-ehci", 270 }, 271 {}, 272 }; 273 MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match); 274 275 276 static struct of_platform_driver ehci_hcd_ppc_of_driver = { 277 .name = "ppc-of-ehci", 278 .match_table = ehci_hcd_ppc_of_match, 279 .probe = ehci_hcd_ppc_of_probe, 280 .remove = ehci_hcd_ppc_of_remove, 281 .shutdown = ehci_hcd_ppc_of_shutdown, 282 .driver = { 283 .name = "ppc-of-ehci", 284 .owner = THIS_MODULE, 285 }, 286 }; 287