2 * EHCI HCD (Host Controller Driver) for USB.
4 * Bus Glue for PPC On-Chip EHCI driver on the of_platform bus
5 * Tested on AMCC PPC 440EPx
7 * Valentine Barshak <vbarshak@ru.mvista.com>
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>
12 * This file is licenced under the GPL.
15 #include <linux/signal.h>
18 #include <linux/of_platform.h>
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),
27 * generic hardware linkage
30 .flags = HCD_MEMORY | HCD_USB2,
33 * basic lifecycle operations
38 .shutdown = ehci_shutdown,
41 * managing i/o requests and associated device resources
43 .urb_enqueue = ehci_urb_enqueue,
44 .urb_dequeue = ehci_urb_dequeue,
45 .endpoint_disable = ehci_endpoint_disable,
46 .endpoint_reset = ehci_endpoint_reset,
51 .get_frame_number = ehci_get_frame,
56 .hub_status_data = ehci_hub_status_data,
57 .hub_control = ehci_hub_control,
59 .bus_suspend = ehci_bus_suspend,
60 .bus_resume = ehci_bus_resume,
62 .relinquish_port = ehci_relinquish_port,
63 .port_handed_over = ehci_port_handed_over,
65 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
70 * 440EPx Errata USBH_3
71 * Fix: Enable Break Memory Transfer (BMT) in INSNREG3
73 #define PPC440EPX_EHCI0_INSREG_BMT (0x1 << 0)
75 ppc44x_enable_bmt(struct device_node *dn)
77 __iomem u32 *insreg_virt;
79 insreg_virt = of_iomap(dn, 1);
83 out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT);
90 static int __devinit ehci_hcd_ppc_of_probe(struct platform_device *op)
92 struct device_node *dn = op->dev.of_node;
94 struct ehci_hcd *ehci = NULL;
99 struct device_node *np;
104 dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
106 rv = of_address_to_resource(dn, 0, &res);
110 hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
114 hcd->rsrc_start = res.start;
115 hcd->rsrc_len = resource_size(&res);
117 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
118 printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__);
123 irq = irq_of_parse_and_map(dn, 0);
125 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
130 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
132 printk(KERN_ERR "%s: ioremap failed\n", __FILE__);
137 ehci = hcd_to_ehci(hcd);
138 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
140 /* claim we really affected by usb23 erratum */
141 if (!of_address_to_resource(np, 0, &res))
142 ehci->ohci_hcctrl_reg = ioremap(res.start +
143 OHCI_HCCTRL_OFFSET, OHCI_HCCTRL_LEN);
145 pr_debug("%s: no ohci offset in fdt\n", __FILE__);
146 if (!ehci->ohci_hcctrl_reg) {
147 pr_debug("%s: ioremap for ohci hcctrl failed\n", __FILE__);
149 ehci->has_amcc_usb23 = 1;
153 if (of_get_property(dn, "big-endian", NULL)) {
154 ehci->big_endian_mmio = 1;
155 ehci->big_endian_desc = 1;
157 if (of_get_property(dn, "big-endian-regs", NULL))
158 ehci->big_endian_mmio = 1;
159 if (of_get_property(dn, "big-endian-desc", NULL))
160 ehci->big_endian_desc = 1;
162 ehci->caps = hcd->regs;
164 if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) {
165 rv = ppc44x_enable_bmt(dn);
166 ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n",
170 rv = usb_add_hcd(hcd, irq, 0);
177 if (ehci->has_amcc_usb23)
178 iounmap(ehci->ohci_hcctrl_reg);
181 irq_dispose_mapping(irq);
183 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
191 static int ehci_hcd_ppc_of_remove(struct platform_device *op)
193 struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
194 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
196 struct device_node *np;
199 dev_set_drvdata(&op->dev, NULL);
201 dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
206 irq_dispose_mapping(hcd->irq);
207 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
209 /* use request_mem_region to test if the ohci driver is loaded. if so
210 * ensure the ohci core is operational.
212 if (ehci->has_amcc_usb23) {
213 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
215 if (!of_address_to_resource(np, 0, &res))
216 if (!request_mem_region(res.start,
218 set_ohci_hcfs(ehci, 1);
220 release_mem_region(res.start, 0x4);
222 pr_debug("%s: no ohci offset in fdt\n", __FILE__);
226 iounmap(ehci->ohci_hcctrl_reg);
234 static void ehci_hcd_ppc_of_shutdown(struct platform_device *op)
236 struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
238 if (hcd->driver->shutdown)
239 hcd->driver->shutdown(hcd);
243 static const struct of_device_id ehci_hcd_ppc_of_match[] = {
245 .compatible = "usb-ehci",
249 MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match);
252 static struct platform_driver ehci_hcd_ppc_of_driver = {
253 .probe = ehci_hcd_ppc_of_probe,
254 .remove = ehci_hcd_ppc_of_remove,
255 .shutdown = ehci_hcd_ppc_of_shutdown,
257 .name = "ppc-of-ehci",
258 .owner = THIS_MODULE,
259 .of_match_table = ehci_hcd_ppc_of_match,