| /* |
| * EHCI HCD (Host Controller Driver) for USB. |
| * |
| * Bus Glue for PPC On-Chip EHCI driver on the of_platform bus |
| * Tested on AMCC PPC 440EPx |
| * |
| * Valentine Barshak <vbarshak@ru.mvista.com> |
| * |
| * Based on "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de> |
| * and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com> |
| * |
| * This file is licenced under the GPL. |
| */ |
| |
| #include <linux/err.h> |
| #include <linux/signal.h> |
| |
| #include <linux/of.h> |
| #include <linux/of_address.h> |
| #include <linux/of_irq.h> |
| #include <linux/of_platform.h> |
| |
| |
| static const struct hc_driver ehci_ppc_of_hc_driver = { |
| .description = hcd_name, |
| .product_desc = "OF EHCI", |
| .hcd_priv_size = sizeof(struct ehci_hcd), |
| |
| /* |
| * generic hardware linkage |
| */ |
| .irq = ehci_irq, |
| .flags = HCD_MEMORY | HCD_USB2 | HCD_BH, |
| |
| /* |
| * basic lifecycle operations |
| */ |
| .reset = ehci_setup, |
| .start = ehci_run, |
| .stop = ehci_stop, |
| .shutdown = ehci_shutdown, |
| |
| /* |
| * managing i/o requests and associated device resources |
| */ |
| .urb_enqueue = ehci_urb_enqueue, |
| .urb_dequeue = ehci_urb_dequeue, |
| .endpoint_disable = ehci_endpoint_disable, |
| .endpoint_reset = ehci_endpoint_reset, |
| |
| /* |
| * scheduling support |
| */ |
| .get_frame_number = ehci_get_frame, |
| |
| /* |
| * root hub support |
| */ |
| .hub_status_data = ehci_hub_status_data, |
| .hub_control = ehci_hub_control, |
| #ifdef CONFIG_PM |
| .bus_suspend = ehci_bus_suspend, |
| .bus_resume = ehci_bus_resume, |
| #endif |
| .relinquish_port = ehci_relinquish_port, |
| .port_handed_over = ehci_port_handed_over, |
| |
| .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, |
| }; |
| |
| |
| /* |
| * 440EPx Errata USBH_3 |
| * Fix: Enable Break Memory Transfer (BMT) in INSNREG3 |
| */ |
| #define PPC440EPX_EHCI0_INSREG_BMT (0x1 << 0) |
| static int |
| ppc44x_enable_bmt(struct device_node *dn) |
| { |
| __iomem u32 *insreg_virt; |
| |
| insreg_virt = of_iomap(dn, 1); |
| if (!insreg_virt) |
| return -EINVAL; |
| |
| out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT); |
| |
| iounmap(insreg_virt); |
| return 0; |
| } |
| |
| |
| static int ehci_hcd_ppc_of_probe(struct platform_device *op) |
| { |
| struct device_node *dn = op->dev.of_node; |
| struct usb_hcd *hcd; |
| struct ehci_hcd *ehci = NULL; |
| struct resource res; |
| int irq; |
| int rv; |
| |
| struct device_node *np; |
| |
| if (usb_disabled()) |
| return -ENODEV; |
| |
| dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n"); |
| |
| rv = of_address_to_resource(dn, 0, &res); |
| if (rv) |
| return rv; |
| |
| hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB"); |
| if (!hcd) |
| return -ENOMEM; |
| |
| hcd->rsrc_start = res.start; |
| hcd->rsrc_len = resource_size(&res); |
| |
| irq = irq_of_parse_and_map(dn, 0); |
| if (irq == NO_IRQ) { |
| dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n", |
| __FILE__); |
| rv = -EBUSY; |
| goto err_irq; |
| } |
| |
| hcd->regs = devm_ioremap_resource(&op->dev, &res); |
| if (IS_ERR(hcd->regs)) { |
| rv = PTR_ERR(hcd->regs); |
| goto err_ioremap; |
| } |
| |
| ehci = hcd_to_ehci(hcd); |
| np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx"); |
| if (np != NULL) { |
| /* claim we really affected by usb23 erratum */ |
| if (!of_address_to_resource(np, 0, &res)) |
| ehci->ohci_hcctrl_reg = |
| devm_ioremap(&op->dev, |
| res.start + OHCI_HCCTRL_OFFSET, |
| OHCI_HCCTRL_LEN); |
| else |
| pr_debug("%s: no ohci offset in fdt\n", __FILE__); |
| if (!ehci->ohci_hcctrl_reg) { |
| pr_debug("%s: ioremap for ohci hcctrl failed\n", __FILE__); |
| } else { |
| ehci->has_amcc_usb23 = 1; |
| } |
| } |
| |
| if (of_get_property(dn, "big-endian", NULL)) { |
| ehci->big_endian_mmio = 1; |
| ehci->big_endian_desc = 1; |
| } |
| if (of_get_property(dn, "big-endian-regs", NULL)) |
| ehci->big_endian_mmio = 1; |
| if (of_get_property(dn, "big-endian-desc", NULL)) |
| ehci->big_endian_desc = 1; |
| |
| ehci->caps = hcd->regs; |
| |
| if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) { |
| rv = ppc44x_enable_bmt(dn); |
| ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n", |
| rv ? "NOT ": ""); |
| } |
| |
| rv = usb_add_hcd(hcd, irq, 0); |
| if (rv) |
| goto err_ioremap; |
| |
| device_wakeup_enable(hcd->self.controller); |
| return 0; |
| |
| err_ioremap: |
| irq_dispose_mapping(irq); |
| err_irq: |
| usb_put_hcd(hcd); |
| |
| return rv; |
| } |
| |
| |
| static int ehci_hcd_ppc_of_remove(struct platform_device *op) |
| { |
| struct usb_hcd *hcd = platform_get_drvdata(op); |
| struct ehci_hcd *ehci = hcd_to_ehci(hcd); |
| |
| struct device_node *np; |
| struct resource res; |
| |
| dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n"); |
| |
| usb_remove_hcd(hcd); |
| |
| irq_dispose_mapping(hcd->irq); |
| |
| /* use request_mem_region to test if the ohci driver is loaded. if so |
| * ensure the ohci core is operational. |
| */ |
| if (ehci->has_amcc_usb23) { |
| np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx"); |
| if (np != NULL) { |
| if (!of_address_to_resource(np, 0, &res)) |
| if (!request_mem_region(res.start, |
| 0x4, hcd_name)) |
| set_ohci_hcfs(ehci, 1); |
| else |
| release_mem_region(res.start, 0x4); |
| else |
| pr_debug("%s: no ohci offset in fdt\n", __FILE__); |
| of_node_put(np); |
| } |
| } |
| usb_put_hcd(hcd); |
| |
| return 0; |
| } |
| |
| |
| static const struct of_device_id ehci_hcd_ppc_of_match[] = { |
| { |
| .compatible = "usb-ehci", |
| }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match); |
| |
| |
| static struct platform_driver ehci_hcd_ppc_of_driver = { |
| .probe = ehci_hcd_ppc_of_probe, |
| .remove = ehci_hcd_ppc_of_remove, |
| .shutdown = usb_hcd_platform_shutdown, |
| .driver = { |
| .name = "ppc-of-ehci", |
| .of_match_table = ehci_hcd_ppc_of_match, |
| }, |
| }; |