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_address.h> 20 #include <linux/of_irq.h> 21 #include <linux/of_platform.h> 22 23 24 static const struct hc_driver ehci_ppc_of_hc_driver = { 25 .description = hcd_name, 26 .product_desc = "OF EHCI", 27 .hcd_priv_size = sizeof(struct ehci_hcd), 28 29 /* 30 * generic hardware linkage 31 */ 32 .irq = ehci_irq, 33 .flags = HCD_MEMORY | HCD_USB2, 34 35 /* 36 * basic lifecycle operations 37 */ 38 .reset = ehci_setup, 39 .start = ehci_run, 40 .stop = ehci_stop, 41 .shutdown = ehci_shutdown, 42 43 /* 44 * managing i/o requests and associated device resources 45 */ 46 .urb_enqueue = ehci_urb_enqueue, 47 .urb_dequeue = ehci_urb_dequeue, 48 .endpoint_disable = ehci_endpoint_disable, 49 .endpoint_reset = ehci_endpoint_reset, 50 51 /* 52 * scheduling support 53 */ 54 .get_frame_number = ehci_get_frame, 55 56 /* 57 * root hub support 58 */ 59 .hub_status_data = ehci_hub_status_data, 60 .hub_control = ehci_hub_control, 61 #ifdef CONFIG_PM 62 .bus_suspend = ehci_bus_suspend, 63 .bus_resume = ehci_bus_resume, 64 #endif 65 .relinquish_port = ehci_relinquish_port, 66 .port_handed_over = ehci_port_handed_over, 67 68 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, 69 }; 70 71 72 /* 73 * 440EPx Errata USBH_3 74 * Fix: Enable Break Memory Transfer (BMT) in INSNREG3 75 */ 76 #define PPC440EPX_EHCI0_INSREG_BMT (0x1 << 0) 77 static int 78 ppc44x_enable_bmt(struct device_node *dn) 79 { 80 __iomem u32 *insreg_virt; 81 82 insreg_virt = of_iomap(dn, 1); 83 if (!insreg_virt) 84 return -EINVAL; 85 86 out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT); 87 88 iounmap(insreg_virt); 89 return 0; 90 } 91 92 93 static int ehci_hcd_ppc_of_probe(struct platform_device *op) 94 { 95 struct device_node *dn = op->dev.of_node; 96 struct usb_hcd *hcd; 97 struct ehci_hcd *ehci = NULL; 98 struct resource res; 99 int irq; 100 int rv; 101 102 struct device_node *np; 103 104 if (usb_disabled()) 105 return -ENODEV; 106 107 dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n"); 108 109 rv = of_address_to_resource(dn, 0, &res); 110 if (rv) 111 return rv; 112 113 hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB"); 114 if (!hcd) 115 return -ENOMEM; 116 117 hcd->rsrc_start = res.start; 118 hcd->rsrc_len = resource_size(&res); 119 120 irq = irq_of_parse_and_map(dn, 0); 121 if (irq == NO_IRQ) { 122 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__); 123 rv = -EBUSY; 124 goto err_irq; 125 } 126 127 hcd->regs = devm_ioremap_resource(&op->dev, &res); 128 if (IS_ERR(hcd->regs)) { 129 rv = PTR_ERR(hcd->regs); 130 goto err_ioremap; 131 } 132 133 ehci = hcd_to_ehci(hcd); 134 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx"); 135 if (np != NULL) { 136 /* claim we really affected by usb23 erratum */ 137 if (!of_address_to_resource(np, 0, &res)) 138 ehci->ohci_hcctrl_reg = 139 devm_ioremap(&op->dev, 140 res.start + OHCI_HCCTRL_OFFSET, 141 OHCI_HCCTRL_LEN); 142 else 143 pr_debug("%s: no ohci offset in fdt\n", __FILE__); 144 if (!ehci->ohci_hcctrl_reg) { 145 pr_debug("%s: ioremap for ohci hcctrl failed\n", __FILE__); 146 } else { 147 ehci->has_amcc_usb23 = 1; 148 } 149 } 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; 161 162 if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) { 163 rv = ppc44x_enable_bmt(dn); 164 ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n", 165 rv ? "NOT ": ""); 166 } 167 168 rv = usb_add_hcd(hcd, irq, 0); 169 if (rv) 170 goto err_ioremap; 171 172 return 0; 173 174 err_ioremap: 175 irq_dispose_mapping(irq); 176 err_irq: 177 usb_put_hcd(hcd); 178 179 return rv; 180 } 181 182 183 static int ehci_hcd_ppc_of_remove(struct platform_device *op) 184 { 185 struct usb_hcd *hcd = platform_get_drvdata(op); 186 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 187 188 struct device_node *np; 189 struct resource res; 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 const struct of_device_id ehci_hcd_ppc_of_match[] = { 221 { 222 .compatible = "usb-ehci", 223 }, 224 {}, 225 }; 226 MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match); 227 228 229 static struct platform_driver ehci_hcd_ppc_of_driver = { 230 .probe = ehci_hcd_ppc_of_probe, 231 .remove = ehci_hcd_ppc_of_remove, 232 .shutdown = usb_hcd_platform_shutdown, 233 .driver = { 234 .name = "ppc-of-ehci", 235 .owner = THIS_MODULE, 236 .of_match_table = ehci_hcd_ppc_of_match, 237 }, 238 }; 239