USB: Add JZ4740 OHCI support

Add OHCI glue code for JZ4740 SoCs OHCI module.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: linux-usb@vger.kernel.org
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1411/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 276 insertions, 0 deletions

diff --git a/drivers/usb/host/ohci-jz4740.c b/drivers/usb/host/ohci-jz4740.c
new file mode 100644
index 000000000000..10e1872f3ab9
--- /dev/null
+++ b/drivers/usb/host/ohci-jz4740.c
@@ -0,0 +1,276 @@
+/*
+ *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under  the terms of the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  You should have received a copy of the  GNU General Public License along
+ *  with this program; if not, write  to the Free Software Foundation, Inc.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/regulator/consumer.h>
+
+struct jz4740_ohci_hcd {
+        struct ohci_hcd ohci_hcd;
+
+        struct regulator *vbus;
+        bool vbus_enabled;
+        struct clk *clk;
+};
+
+static inline struct jz4740_ohci_hcd *hcd_to_jz4740_hcd(struct usb_hcd *hcd)
+{
+        return (struct jz4740_ohci_hcd *)(hcd->hcd_priv);
+}
+
+static inline struct usb_hcd *jz4740_hcd_to_hcd(struct jz4740_ohci_hcd *jz4740_ohci)
+{
+        return container_of((void *)jz4740_ohci, struct usb_hcd, hcd_priv);
+}
+
+static int ohci_jz4740_start(struct usb_hcd *hcd)
+{
+        struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+        int     ret;
+
+        ret = ohci_init(ohci);
+        if (ret < 0)
+                return ret;
+
+        ohci->num_ports = 1;
+
+        ret = ohci_run(ohci);
+        if (ret < 0) {
+                dev_err(hcd->self.controller, "Can not start %s",
+                        hcd->self.bus_name);
+                ohci_stop(hcd);
+                return ret;
+        }
+        return 0;
+}
+
+static int ohci_jz4740_set_vbus_power(struct jz4740_ohci_hcd *jz4740_ohci,
+        bool enabled)
+{
+        int ret = 0;
+
+        if (!jz4740_ohci->vbus)
+                return 0;
+
+        if (enabled && !jz4740_ohci->vbus_enabled) {
+                ret = regulator_enable(jz4740_ohci->vbus);
+                if (ret)
+                        dev_err(jz4740_hcd_to_hcd(jz4740_ohci)->self.controller,
+                                "Could not power vbus\n");
+        } else if (!enabled && jz4740_ohci->vbus_enabled) {
+                ret = regulator_disable(jz4740_ohci->vbus);
+        }
+
+        if (ret == 0)
+                jz4740_ohci->vbus_enabled = enabled;
+
+        return ret;
+}
+
+static int ohci_jz4740_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
+        u16 wIndex, char *buf, u16 wLength)
+{
+        struct jz4740_ohci_hcd *jz4740_ohci = hcd_to_jz4740_hcd(hcd);
+        int ret;
+
+        switch (typeReq) {
+        case SetHubFeature:
+                if (wValue == USB_PORT_FEAT_POWER)
+                        ret = ohci_jz4740_set_vbus_power(jz4740_ohci, true);
+                break;
+        case ClearHubFeature:
+                if (wValue == USB_PORT_FEAT_POWER)
+                        ret = ohci_jz4740_set_vbus_power(jz4740_ohci, false);
+                break;
+        }
+
+        if (ret)
+                return ret;
+
+        return ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
+}
+
+
+static const struct hc_driver ohci_jz4740_hc_driver = {
+        .description =          hcd_name,
+        .product_desc =         "JZ4740 OHCI",
+        .hcd_priv_size =        sizeof(struct jz4740_ohci_hcd),
+
+        /*
+         * generic hardware linkage
+         */
+        .irq =                  ohci_irq,
+        .flags =                HCD_USB11 | HCD_MEMORY,
+
+        /*
+         * basic lifecycle operations
+         */
+        .start =                ohci_jz4740_start,
+        .stop =                 ohci_stop,
+        .shutdown =             ohci_shutdown,
+
+        /*
+         * managing i/o requests and associated device resources
+         */
+        .urb_enqueue =          ohci_urb_enqueue,
+        .urb_dequeue =          ohci_urb_dequeue,
+        .endpoint_disable =     ohci_endpoint_disable,
+
+        /*
+         * scheduling support
+         */
+        .get_frame_number =     ohci_get_frame,
+
+        /*
+         * root hub support
+         */
+        .hub_status_data =      ohci_hub_status_data,
+        .hub_control =          ohci_jz4740_hub_control,
+#ifdef  CONFIG_PM
+        .bus_suspend =          ohci_bus_suspend,
+        .bus_resume =           ohci_bus_resume,
+#endif
+        .start_port_reset =     ohci_start_port_reset,
+};
+
+
+static __devinit int jz4740_ohci_probe(struct platform_device *pdev)
+{
+        int ret;
+        struct usb_hcd *hcd;
+        struct jz4740_ohci_hcd *jz4740_ohci;
+        struct resource *res;
+        int irq;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+        if (!res) {
+                dev_err(&pdev->dev, "Failed to get platform resource\n");
+                return -ENOENT;
+        }
+
+        irq = platform_get_irq(pdev, 0);
+        if (irq < 0) {
+                dev_err(&pdev->dev, "Failed to get platform irq\n");
+                return irq;
+        }
+
+        hcd = usb_create_hcd(&ohci_jz4740_hc_driver, &pdev->dev, "jz4740");
+        if (!hcd) {
+                dev_err(&pdev->dev, "Failed to create hcd.\n");
+                return -ENOMEM;
+        }
+
+        jz4740_ohci = hcd_to_jz4740_hcd(hcd);
+
+        res = request_mem_region(res->start, resource_size(res), hcd_name);
+        if (!res) {
+                dev_err(&pdev->dev, "Failed to request mem region.\n");
+                ret = -EBUSY;
+                goto err_free;
+        }
+
+        hcd->rsrc_start = res->start;
+        hcd->rsrc_len = resource_size(res);
+        hcd->regs = ioremap(res->start, resource_size(res));
+
+        if (!hcd->regs) {
+                dev_err(&pdev->dev, "Failed to ioremap registers.\n");
+                ret = -EBUSY;
+                goto err_release_mem;
+        }
+
+        jz4740_ohci->clk = clk_get(&pdev->dev, "uhc");
+        if (IS_ERR(jz4740_ohci->clk)) {
+                ret = PTR_ERR(jz4740_ohci->clk);
+                dev_err(&pdev->dev, "Failed to get clock: %d\n", ret);
+                goto err_iounmap;
+        }
+
+        jz4740_ohci->vbus = regulator_get(&pdev->dev, "vbus");
+        if (IS_ERR(jz4740_ohci->vbus))
+                jz4740_ohci->vbus = NULL;
+
+
+        clk_set_rate(jz4740_ohci->clk, 48000000);
+        clk_enable(jz4740_ohci->clk);
+        if (jz4740_ohci->vbus)
+                ohci_jz4740_set_vbus_power(jz4740_ohci, true);
+
+        platform_set_drvdata(pdev, hcd);
+
+        ohci_hcd_init(hcd_to_ohci(hcd));
+
+        ret = usb_add_hcd(hcd, irq, 0);
+        if (ret) {
+                dev_err(&pdev->dev, "Failed to add hcd: %d\n", ret);
+                goto err_disable;
+        }
+
+        return 0;
+
+err_disable:
+        platform_set_drvdata(pdev, NULL);
+        if (jz4740_ohci->vbus) {
+                regulator_disable(jz4740_ohci->vbus);
+                regulator_put(jz4740_ohci->vbus);
+        }
+        clk_disable(jz4740_ohci->clk);
+
+        clk_put(jz4740_ohci->clk);
+err_iounmap:
+        iounmap(hcd->regs);
+err_release_mem:
+        release_mem_region(res->start, resource_size(res));
+err_free:
+        usb_put_hcd(hcd);
+
+        return ret;
+}
+
+static __devexit int jz4740_ohci_remove(struct platform_device *pdev)
+{
+        struct usb_hcd *hcd = platform_get_drvdata(pdev);
+        struct jz4740_ohci_hcd *jz4740_ohci = hcd_to_jz4740_hcd(hcd);
+
+        usb_remove_hcd(hcd);
+
+        platform_set_drvdata(pdev, NULL);
+
+        if (jz4740_ohci->vbus) {
+                regulator_disable(jz4740_ohci->vbus);
+                regulator_put(jz4740_ohci->vbus);
+        }
+
+        clk_disable(jz4740_ohci->clk);
+        clk_put(jz4740_ohci->clk);
+
+        iounmap(hcd->regs);
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+
+        usb_put_hcd(hcd);
+
+        return 0;
+}
+
+static struct platform_driver ohci_hcd_jz4740_driver = {
+        .probe = jz4740_ohci_probe,
+        .remove = __devexit_p(jz4740_ohci_remove),
+        .driver = {
+                .name = "jz4740-ohci",
+                .owner = THIS_MODULE,
+        },
+};
+
+MODULE_ALIAS("platfrom:jz4740-ohci");