--- /dev/null
+/*
+ * 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,
+ },
+};
Code Review / kvmfornfv.git / blobdiff