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 | HCD_BH, 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 dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n", 123 __FILE__); 124 rv = -EBUSY; 125 goto err_irq; 126 } 127 128 hcd->regs = devm_ioremap_resource(&op->dev, &res); 129 if (IS_ERR(hcd->regs)) { 130 rv = PTR_ERR(hcd->regs); 131 goto err_ioremap; 132 } 133 134 ehci = hcd_to_ehci(hcd); 135 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx"); 136 if (np != NULL) { 137 /* claim we really affected by usb23 erratum */ 138 if (!of_address_to_resource(np, 0, &res)) 139 ehci->ohci_hcctrl_reg = 140 devm_ioremap(&op->dev, 141 res.start + OHCI_HCCTRL_OFFSET, 142 OHCI_HCCTRL_LEN); 143 else 144 pr_debug("%s: no ohci offset in fdt\n", __FILE__); 145 if (!ehci->ohci_hcctrl_reg) { 146 pr_debug("%s: ioremap for ohci hcctrl failed\n", __FILE__); 147 } else { 148 ehci->has_amcc_usb23 = 1; 149 } 150 } 151 152 if (of_get_property(dn, "big-endian", NULL)) { 153 ehci->big_endian_mmio = 1; 154 ehci->big_endian_desc = 1; 155 } 156 if (of_get_property(dn, "big-endian-regs", NULL)) 157 ehci->big_endian_mmio = 1; 158 if (of_get_property(dn, "big-endian-desc", NULL)) 159 ehci->big_endian_desc = 1; 160 161 ehci->caps = hcd->regs; 162 163 if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) { 164 rv = ppc44x_enable_bmt(dn); 165 ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n", 166 rv ? "NOT ": ""); 167 } 168 169 rv = usb_add_hcd(hcd, irq, 0); 170 if (rv) 171 goto err_ioremap; 172 173 device_wakeup_enable(hcd->self.controller); 174 return 0; 175 176 err_ioremap: 177 irq_dispose_mapping(irq); 178 err_irq: 179 usb_put_hcd(hcd); 180 181 return rv; 182 } 183 184 185 static int ehci_hcd_ppc_of_remove(struct platform_device *op) 186 { 187 struct usb_hcd *hcd = platform_get_drvdata(op); 188 struct ehci_hcd *ehci = hcd_to_ehci(hcd); 189 190 struct device_node *np; 191 struct resource res; 192 193 dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n"); 194 195 usb_remove_hcd(hcd); 196 197 irq_dispose_mapping(hcd->irq); 198 199 /* use request_mem_region to test if the ohci driver is loaded. if so 200 * ensure the ohci core is operational. 201 */ 202 if (ehci->has_amcc_usb23) { 203 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx"); 204 if (np != NULL) { 205 if (!of_address_to_resource(np, 0, &res)) 206 if (!request_mem_region(res.start, 207 0x4, hcd_name)) 208 set_ohci_hcfs(ehci, 1); 209 else 210 release_mem_region(res.start, 0x4); 211 else 212 pr_debug("%s: no ohci offset in fdt\n", __FILE__); 213 of_node_put(np); 214 } 215 } 216 usb_put_hcd(hcd); 217 218 return 0; 219 } 220 221 222 static const struct of_device_id ehci_hcd_ppc_of_match[] = { 223 { 224 .compatible = "usb-ehci", 225 }, 226 {}, 227 }; 228 MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match); 229 230 231 static struct platform_driver ehci_hcd_ppc_of_driver = { 232 .probe = ehci_hcd_ppc_of_probe, 233 .remove = ehci_hcd_ppc_of_remove, 234 .shutdown = usb_hcd_platform_shutdown, 235 .driver = { 236 .name = "ppc-of-ehci", 237 .owner = THIS_MODULE, 238 .of_match_table = ehci_hcd_ppc_of_match, 239 }, 240 }; 241