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>
20 /* called during probe() after chip reset completes */
21 static int ehci_ppc_of_setup(struct usb_hcd *hcd)
23 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
26 retval = ehci_halt(ehci);
30 retval = ehci_init(hcd);
35 return ehci_reset(ehci);
39 static const struct hc_driver ehci_ppc_of_hc_driver = {
40 .description = hcd_name,
41 .product_desc = "OF EHCI",
42 .hcd_priv_size = sizeof(struct ehci_hcd),
45 * generic hardware linkage
48 .flags = HCD_MEMORY | HCD_USB2,
51 * basic lifecycle operations
53 .reset = ehci_ppc_of_setup,
56 .shutdown = ehci_shutdown,
59 * managing i/o requests and associated device resources
61 .urb_enqueue = ehci_urb_enqueue,
62 .urb_dequeue = ehci_urb_dequeue,
63 .endpoint_disable = ehci_endpoint_disable,
64 .endpoint_reset = ehci_endpoint_reset,
69 .get_frame_number = ehci_get_frame,
74 .hub_status_data = ehci_hub_status_data,
75 .hub_control = ehci_hub_control,
77 .bus_suspend = ehci_bus_suspend,
78 .bus_resume = ehci_bus_resume,
80 .relinquish_port = ehci_relinquish_port,
81 .port_handed_over = ehci_port_handed_over,
83 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
88 * 440EPx Errata USBH_3
89 * Fix: Enable Break Memory Transfer (BMT) in INSNREG3
91 #define PPC440EPX_EHCI0_INSREG_BMT (0x1 << 0)
93 ppc44x_enable_bmt(struct device_node *dn)
95 __iomem u32 *insreg_virt;
97 insreg_virt = of_iomap(dn, 1);
101 out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT);
103 iounmap(insreg_virt);
108 static int __devinit ehci_hcd_ppc_of_probe(struct platform_device *op)
110 struct device_node *dn = op->dev.of_node;
112 struct ehci_hcd *ehci = NULL;
117 struct device_node *np;
122 dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
124 rv = of_address_to_resource(dn, 0, &res);
128 hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
132 hcd->rsrc_start = res.start;
133 hcd->rsrc_len = res.end - res.start + 1;
135 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
136 printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__);
141 irq = irq_of_parse_and_map(dn, 0);
143 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
148 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
150 printk(KERN_ERR "%s: ioremap failed\n", __FILE__);
155 ehci = hcd_to_ehci(hcd);
156 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
158 /* claim we really affected by usb23 erratum */
159 if (!of_address_to_resource(np, 0, &res))
160 ehci->ohci_hcctrl_reg = ioremap(res.start +
161 OHCI_HCCTRL_OFFSET, OHCI_HCCTRL_LEN);
163 pr_debug("%s: no ohci offset in fdt\n", __FILE__);
164 if (!ehci->ohci_hcctrl_reg) {
165 pr_debug("%s: ioremap for ohci hcctrl failed\n", __FILE__);
167 ehci->has_amcc_usb23 = 1;
171 if (of_get_property(dn, "big-endian", NULL)) {
172 ehci->big_endian_mmio = 1;
173 ehci->big_endian_desc = 1;
175 if (of_get_property(dn, "big-endian-regs", NULL))
176 ehci->big_endian_mmio = 1;
177 if (of_get_property(dn, "big-endian-desc", NULL))
178 ehci->big_endian_desc = 1;
180 ehci->caps = hcd->regs;
181 ehci->regs = hcd->regs +
182 HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
184 /* cache this readonly data; minimize chip reads */
185 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
187 if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) {
188 rv = ppc44x_enable_bmt(dn);
189 ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n",
193 rv = usb_add_hcd(hcd, irq, 0);
200 if (ehci->has_amcc_usb23)
201 iounmap(ehci->ohci_hcctrl_reg);
204 irq_dispose_mapping(irq);
206 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
214 static int ehci_hcd_ppc_of_remove(struct platform_device *op)
216 struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
217 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
219 struct device_node *np;
222 dev_set_drvdata(&op->dev, NULL);
224 dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
229 irq_dispose_mapping(hcd->irq);
230 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
232 /* use request_mem_region to test if the ohci driver is loaded. if so
233 * ensure the ohci core is operational.
235 if (ehci->has_amcc_usb23) {
236 np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
238 if (!of_address_to_resource(np, 0, &res))
239 if (!request_mem_region(res.start,
241 set_ohci_hcfs(ehci, 1);
243 release_mem_region(res.start, 0x4);
245 pr_debug("%s: no ohci offset in fdt\n", __FILE__);
249 iounmap(ehci->ohci_hcctrl_reg);
257 static void ehci_hcd_ppc_of_shutdown(struct platform_device *op)
259 struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
261 if (hcd->driver->shutdown)
262 hcd->driver->shutdown(hcd);
266 static const struct of_device_id ehci_hcd_ppc_of_match[] = {
268 .compatible = "usb-ehci",
272 MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match);
275 static struct platform_driver ehci_hcd_ppc_of_driver = {
276 .probe = ehci_hcd_ppc_of_probe,
277 .remove = ehci_hcd_ppc_of_remove,
278 .shutdown = ehci_hcd_ppc_of_shutdown,
280 .name = "ppc-of-ehci",
281 .owner = THIS_MODULE,
282 .of_match_table = ehci_hcd_ppc_of_match,