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 21 static const struct hc_driver ehci_ppc_of_hc_driver = { 22 .description = hcd_name, 23 .product_desc = "OF EHCI", 24 .hcd_priv_size = sizeof(struct ehci_hcd), 25 26 /* 27 * generic hardware linkage 28 */ 29 .irq = ehci_irq, 30 .flags = HCD_MEMORY | HCD_USB2, 31 32 /* 33 * basic lifecycle operations 34 */ 35 .reset = ehci_setup, 36 .start = ehci_run, 37 .stop = ehci_stop, 38 .shutdown = ehci_shutdown, 39 40 /* 41 * managing i/o requests and associated device resources 42 */ 43 .urb_enqueue = ehci_urb_enqueue, 44 .urb_dequeue = ehci_urb_dequeue, 45 .endpoint_disable = ehci_endpoint_disable, 46 .endpoint_reset = ehci_endpoint_reset, 47 48 /* 49 * scheduling support 50 */ 51 .get_frame_number = ehci_get_frame, 52 53 /* 54 * root hub support 55 */ 56 .hub_status_data = ehci_hub_status_data, 57 .hub_control = ehci_hub_control, 58 #ifdef CONFIG_PM 59 .bus_suspend = ehci_bus_suspend, 60 .bus_resume = ehci_bus_resume, 61 #endif 62 .relinquish_port = ehci_relinquish_port, 63 .port_handed_over = ehci_port_handed_over, 64 65 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, 66 }; 67 68 69 /* 70 * 440EPx Errata USBH_3 71 * Fix: Enable Break Memory Transfer (BMT) in INSNREG3 72 */ 73 #define PPC440EPX_EHCI0_INSREG_BMT (0x1 << 0) 74 static int __devinit 75 ppc44x_enable_bmt(struct device_node *dn) 76 { 77 __iomem u32 *insreg_virt; 78 79 insreg_virt = of_iomap(dn, 1); 80 if (!insreg_virt) 81 return -EINVAL; 82 83 out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT); 84 85 iounmap(insreg_virt); 86 return 0; 87 } 88 89 90 static int __devinit ehci_hcd_ppc_of_probe(struct platform_device *op) 91 { 92 struct device_node *dn = op->dev.of_node; 93 struct usb_hcd *hcd; 94 struct ehci_hcd *ehci = NULL; 95 struct resource res; 96 int irq; 97 int rv; 98 99 struct device_node *np; 100 101 if (usb_disabled()) 102 return -ENODEV; 103 104 dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n"); 105 106 rv = of_address_to_resource(dn, 0, &res); 107 if (rv) 108 return rv; 109 110 hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB"); 111 if (!hcd) 112 return -ENOMEM; 113 114 hcd->rsrc_start = res.start; 115 hcd->rsrc_len = resource_size(&res); 116 117 irq = irq_of_parse_and_map(dn, 0); 118 if (irq == NO_IRQ) { 119 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__); 120 rv = -EBUSY; 121 goto err_irq; 122 } 123 124 hcd->regs = devm_request_and_ioremap(&op->dev, &res); 125 if (!hcd->regs) { 126 pr_err("%s: devm_request_and_ioremap failed\n", __FILE__); 127 rv = -ENOMEM; 128 goto err_ioremap; 129 } 130 131 ehci = hcd_to_ehci(hcd); 132 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx"); 133 if (np != NULL) { 134 /* claim we really affected by usb23 erratum */ 135 if (!of_address_to_resource(np, 0, &res)) 136 ehci->ohci_hcctrl_reg = 137 devm_ioremap(&op->dev, 138 res.start + OHCI_HCCTRL_OFFSET, 139 OHCI_HCCTRL_LEN); 140 else 141 pr_debug("%s: no ohci offset in fdt\n", __FILE__); 142 if (!ehci->ohci_hcctrl_reg) { 143 pr_debug("%s: ioremap for ohci hcctrl failed\n", __FILE__); 144 } else { 145 ehci->has_amcc_usb23 = 1; 146 } 147 } 148 149 if (of_get_property(dn, "big-endian", NULL)) { 150 ehci->big_endian_mmio = 1; 151 ehci->big_endian_desc = 1; 152 } 153 if (of_get_property(dn, "big-endian-regs", NULL)) 154 ehci->big_endian_mmio = 1; 155 if (of_get_property(dn, "big-endian-desc", NULL)) 156 ehci->big_endian_desc = 1; 157 158 ehci->caps = hcd->regs; 159 160 if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) { 161 rv = ppc44x_enable_bmt(dn); 162 ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n", 163 rv ? "NOT ": ""); 164 } 165 166 rv = usb_add_hcd(hcd, irq, 0); 167 if (rv) 168 goto err_ioremap; 169 170 return 0; 171 172 err_ioremap: 173 irq_dispose_mapping(irq); 174 err_irq: 175 usb_put_hcd(hcd); 176 177 return rv; 178 } 179 180 181 static int ehci_hcd_ppc_of_remove(struct platform_device *op) 182 { 183 struct usb_hcd *hcd = dev_get_drvdata(&op->dev); 184 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 185 186 struct device_node *np; 187 struct resource res; 188 189 dev_set_drvdata(&op->dev, NULL); 190 191 dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n"); 192 193 usb_remove_hcd(hcd); 194 195 irq_dispose_mapping(hcd->irq); 196 197 /* use request_mem_region to test if the ohci driver is loaded. if so 198 * ensure the ohci core is operational. 199 */ 200 if (ehci->has_amcc_usb23) { 201 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx"); 202 if (np != NULL) { 203 if (!of_address_to_resource(np, 0, &res)) 204 if (!request_mem_region(res.start, 205 0x4, hcd_name)) 206 set_ohci_hcfs(ehci, 1); 207 else 208 release_mem_region(res.start, 0x4); 209 else 210 pr_debug("%s: no ohci offset in fdt\n", __FILE__); 211 of_node_put(np); 212 } 213 } 214 usb_put_hcd(hcd); 215 216 return 0; 217 } 218 219 220 static void ehci_hcd_ppc_of_shutdown(struct platform_device *op) 221 { 222 struct usb_hcd *hcd = dev_get_drvdata(&op->dev); 223 224 if (hcd->driver->shutdown) 225 hcd->driver->shutdown(hcd); 226 } 227 228 229 static const struct of_device_id ehci_hcd_ppc_of_match[] = { 230 { 231 .compatible = "usb-ehci", 232 }, 233 {}, 234 }; 235 MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match); 236 237 238 static struct platform_driver ehci_hcd_ppc_of_driver = { 239 .probe = ehci_hcd_ppc_of_probe, 240 .remove = ehci_hcd_ppc_of_remove, 241 .shutdown = ehci_hcd_ppc_of_shutdown, 242 .driver = { 243 .name = "ppc-of-ehci", 244 .owner = THIS_MODULE, 245 .of_match_table = ehci_hcd_ppc_of_match, 246 }, 247 }; 248