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/err.h> 16 #include <linux/signal.h> 17 18 #include <linux/of.h> 19 #include <linux/of_platform.h> 20 21 22 static const struct hc_driver ehci_ppc_of_hc_driver = { 23 .description = hcd_name, 24 .product_desc = "OF EHCI", 25 .hcd_priv_size = sizeof(struct ehci_hcd), 26 27 /* 28 * generic hardware linkage 29 */ 30 .irq = ehci_irq, 31 .flags = HCD_MEMORY | HCD_USB2, 32 33 /* 34 * basic lifecycle operations 35 */ 36 .reset = ehci_setup, 37 .start = ehci_run, 38 .stop = ehci_stop, 39 .shutdown = ehci_shutdown, 40 41 /* 42 * managing i/o requests and associated device resources 43 */ 44 .urb_enqueue = ehci_urb_enqueue, 45 .urb_dequeue = ehci_urb_dequeue, 46 .endpoint_disable = ehci_endpoint_disable, 47 .endpoint_reset = ehci_endpoint_reset, 48 49 /* 50 * scheduling support 51 */ 52 .get_frame_number = ehci_get_frame, 53 54 /* 55 * root hub support 56 */ 57 .hub_status_data = ehci_hub_status_data, 58 .hub_control = ehci_hub_control, 59 #ifdef CONFIG_PM 60 .bus_suspend = ehci_bus_suspend, 61 .bus_resume = ehci_bus_resume, 62 #endif 63 .relinquish_port = ehci_relinquish_port, 64 .port_handed_over = ehci_port_handed_over, 65 66 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, 67 }; 68 69 70 /* 71 * 440EPx Errata USBH_3 72 * Fix: Enable Break Memory Transfer (BMT) in INSNREG3 73 */ 74 #define PPC440EPX_EHCI0_INSREG_BMT (0x1 << 0) 75 static int 76 ppc44x_enable_bmt(struct device_node *dn) 77 { 78 __iomem u32 *insreg_virt; 79 80 insreg_virt = of_iomap(dn, 1); 81 if (!insreg_virt) 82 return -EINVAL; 83 84 out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT); 85 86 iounmap(insreg_virt); 87 return 0; 88 } 89 90 91 static int ehci_hcd_ppc_of_probe(struct platform_device *op) 92 { 93 struct device_node *dn = op->dev.of_node; 94 struct usb_hcd *hcd; 95 struct ehci_hcd *ehci = NULL; 96 struct resource res; 97 int irq; 98 int rv; 99 100 struct device_node *np; 101 102 if (usb_disabled()) 103 return -ENODEV; 104 105 dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n"); 106 107 rv = of_address_to_resource(dn, 0, &res); 108 if (rv) 109 return rv; 110 111 hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB"); 112 if (!hcd) 113 return -ENOMEM; 114 115 hcd->rsrc_start = res.start; 116 hcd->rsrc_len = resource_size(&res); 117 118 irq = irq_of_parse_and_map(dn, 0); 119 if (irq == NO_IRQ) { 120 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__); 121 rv = -EBUSY; 122 goto err_irq; 123 } 124 125 hcd->regs = devm_ioremap_resource(&op->dev, &res); 126 if (IS_ERR(hcd->regs)) { 127 rv = PTR_ERR(hcd->regs); 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 = platform_get_drvdata(op); 184 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 185 186 struct device_node *np; 187 struct resource res; 188 189 dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n"); 190 191 usb_remove_hcd(hcd); 192 193 irq_dispose_mapping(hcd->irq); 194 195 /* use request_mem_region to test if the ohci driver is loaded. if so 196 * ensure the ohci core is operational. 197 */ 198 if (ehci->has_amcc_usb23) { 199 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx"); 200 if (np != NULL) { 201 if (!of_address_to_resource(np, 0, &res)) 202 if (!request_mem_region(res.start, 203 0x4, hcd_name)) 204 set_ohci_hcfs(ehci, 1); 205 else 206 release_mem_region(res.start, 0x4); 207 else 208 pr_debug("%s: no ohci offset in fdt\n", __FILE__); 209 of_node_put(np); 210 } 211 } 212 usb_put_hcd(hcd); 213 214 return 0; 215 } 216 217 218 static const struct of_device_id ehci_hcd_ppc_of_match[] = { 219 { 220 .compatible = "usb-ehci", 221 }, 222 {}, 223 }; 224 MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match); 225 226 227 static struct platform_driver ehci_hcd_ppc_of_driver = { 228 .probe = ehci_hcd_ppc_of_probe, 229 .remove = ehci_hcd_ppc_of_remove, 230 .shutdown = usb_hcd_platform_shutdown, 231 .driver = { 232 .name = "ppc-of-ehci", 233 .owner = THIS_MODULE, 234 .of_match_table = ehci_hcd_ppc_of_match, 235 }, 236 }; 237