USB: add ehci-ppc-of bus glue (device-tree aware)

This adds device-tree-aware ehci-ppc-of driver.
The code is based on the ehci-ppc-soc driver by
Stefan Roese <sr@denx.de>.

Signed-off-by: Valentine Barshak <vbarshak@ru.mvista.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Stefan Roese <sr@denx.de>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 238 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-ppc-of.c b/drivers/usb/host/ehci-ppc-of.c
new file mode 100644
index 000000000000..ee305b1f99ff
--- /dev/null
+++ b/drivers/usb/host/ehci-ppc-of.c
@@ -0,0 +1,238 @@
+/*
+ * 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/signal.h>
+
+#include <linux/of.h>
+#include <linux/of_platform.h>
+
+/* called during probe() after chip reset completes */
+static int ehci_ppc_of_setup(struct usb_hcd *hcd)
+{
+        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+        int             retval;
+
+        retval = ehci_halt(ehci);
+        if (retval)
+                return retval;
+
+        retval = ehci_init(hcd);
+        if (retval)
+                return retval;
+
+        ehci->sbrn = 0x20;
+        return ehci_reset(ehci);
+}
+
+
+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,
+
+        /*
+         * basic lifecycle operations
+         */
+        .reset                  = ehci_ppc_of_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,
+
+        /*
+         * 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
+};
+
+
+/*
+ * 440EPx Errata USBH_3
+ * Fix: Enable Break Memory Transfer (BMT) in INSNREG3
+ */
+#define PPC440EPX_EHCI0_INSREG_BMT      (0x1 << 0)
+static int __devinit
+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 __devinit
+ehci_hcd_ppc_of_probe(struct of_device *op, const struct of_device_id *match)
+{
+        struct device_node *dn = op->node;
+        struct usb_hcd *hcd;
+        struct ehci_hcd *ehci;
+        struct resource res;
+        int irq;
+        int rv;
+
+        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 = res.end - res.start + 1;
+
+        if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
+                printk(KERN_ERR __FILE__ ": request_mem_region failed\n");
+                rv = -EBUSY;
+                goto err_rmr;
+        }
+
+        irq = irq_of_parse_and_map(dn, 0);
+        if (irq == NO_IRQ) {
+                printk(KERN_ERR __FILE__ ": irq_of_parse_and_map failed\n");
+                rv = -EBUSY;
+                goto err_irq;
+        }
+
+        hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+        if (!hcd->regs) {
+                printk(KERN_ERR __FILE__ ": ioremap failed\n");
+                rv = -ENOMEM;
+                goto err_ioremap;
+        }
+
+        ehci = hcd_to_ehci(hcd);
+
+        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;
+        ehci->regs = hcd->regs +
+                        HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
+
+        /* cache this readonly data; minimize chip reads */
+        ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
+
+        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 == 0)
+                return 0;
+
+        iounmap(hcd->regs);
+err_ioremap:
+        irq_dispose_mapping(irq);
+err_irq:
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err_rmr:
+        usb_put_hcd(hcd);
+
+        return rv;
+}
+
+
+static int ehci_hcd_ppc_of_remove(struct of_device *op)
+{
+        struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
+        dev_set_drvdata(&op->dev, NULL);
+
+        dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
+
+        usb_remove_hcd(hcd);
+
+        iounmap(hcd->regs);
+        irq_dispose_mapping(hcd->irq);
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+
+        usb_put_hcd(hcd);
+
+        return 0;
+}
+
+
+static int ehci_hcd_ppc_of_shutdown(struct of_device *op)
+{
+        struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
+
+        if (hcd->driver->shutdown)
+                hcd->driver->shutdown(hcd);
+
+        return 0;
+}
+
+
+static struct of_device_id ehci_hcd_ppc_of_match[] = {
+        {
+                .compatible = "usb-ehci",
+        },
+        {},
+};
+MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match);
+
+
+static struct of_platform_driver ehci_hcd_ppc_of_driver = {
+        .name           = "ppc-of-ehci",
+        .match_table    = ehci_hcd_ppc_of_match,
+        .probe          = ehci_hcd_ppc_of_probe,
+        .remove         = ehci_hcd_ppc_of_remove,
+        .shutdown       = ehci_hcd_ppc_of_shutdown,
+        .driver         = {
+                .name   = "ppc-of-ehci",
+                .owner  = THIS_MODULE,
+        },
+};