USB: cns3xxx: Add EHCI and OHCI bus glue for cns3xxx SOCs

The CNS3XXX SOC has include USB EHCI and OHCI compatible controllers.
This patch adds the necessary glue logic to allow ehci-hcd and ohci-hcd
drivers to work on CNS3XXX

The EHCI and OHCI controllers share a common clock control and reset
bit, therefore additional check for the timming of enabling and disabling
is required. The USB bit of PLL Power Down Control is also shared by OTG,
24MHzUART clock, Crypto clock, PCIe reference clock, and Clock Scale
Generator. Therefore we only ensure it is enabled, while not disabling it.

Signed-off-by: Mac Lin <mkl0301@gmail.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>

1 files changed, 171 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-cns3xxx.c b/drivers/usb/host/ehci-cns3xxx.c
new file mode 100644
index 000000000000..708a05b5d258
--- /dev/null
+++ b/drivers/usb/host/ehci-cns3xxx.c
@@ -0,0 +1,171 @@
+/*
+ * Copyright 2008 Cavium Networks
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, Version 2, as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/atomic.h>
+#include <mach/cns3xxx.h>
+#include <mach/pm.h>
+
+static int cns3xxx_ehci_init(struct usb_hcd *hcd)
+{
+        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+        int retval;
+
+        /*
+         * EHCI and OHCI share the same clock and power,
+         * resetting twice would cause the 1st controller been reset.
+         * Therefore only do power up  at the first up device, and
+         * power down at the last down device.
+         *
+         * Set USB AHB INCR length to 16
+         */
+        if (atomic_inc_return(&usb_pwr_ref) == 1) {
+                cns3xxx_pwr_power_up(1 << PM_PLL_HM_PD_CTRL_REG_OFFSET_PLL_USB);
+                cns3xxx_pwr_clk_en(1 << PM_CLK_GATE_REG_OFFSET_USB_HOST);
+                cns3xxx_pwr_soft_rst(1 << PM_SOFT_RST_REG_OFFST_USB_HOST);
+                __raw_writel((__raw_readl(MISC_CHIP_CONFIG_REG) | (0X2 << 24)),
+                        MISC_CHIP_CONFIG_REG);
+        }
+
+        ehci->caps = hcd->regs;
+        ehci->regs = hcd->regs
+                + HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
+        ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
+
+        hcd->has_tt = 0;
+        ehci_reset(ehci);
+
+        retval = ehci_init(hcd);
+        if (retval)
+                return retval;
+
+        ehci_port_power(ehci, 0);
+
+        return retval;
+}
+
+static const struct hc_driver cns3xxx_ehci_hc_driver = {
+        .description            = hcd_name,
+        .product_desc           = "CNS3XXX EHCI Host Controller",
+        .hcd_priv_size          = sizeof(struct ehci_hcd),
+        .irq                    = ehci_irq,
+        .flags                  = HCD_MEMORY | HCD_USB2,
+        .reset                  = cns3xxx_ehci_init,
+        .start                  = ehci_run,
+        .stop                   = ehci_stop,
+        .shutdown               = ehci_shutdown,
+        .urb_enqueue            = ehci_urb_enqueue,
+        .urb_dequeue            = ehci_urb_dequeue,
+        .endpoint_disable       = ehci_endpoint_disable,
+        .endpoint_reset         = ehci_endpoint_reset,
+        .get_frame_number       = ehci_get_frame,
+        .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,
+};
+
+static int cns3xxx_ehci_probe(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct usb_hcd *hcd;
+        const struct hc_driver *driver = &cns3xxx_ehci_hc_driver;
+        struct resource *res;
+        int irq;
+        int retval;
+
+        if (usb_disabled())
+                return -ENODEV;
+
+        res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+        if (!res) {
+                dev_err(dev, "Found HC with no IRQ.\n");
+                return -ENODEV;
+        }
+        irq = res->start;
+
+        hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
+        if (!hcd)
+                return -ENOMEM;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                dev_err(dev, "Found HC with no register addr.\n");
+                retval = -ENODEV;
+                goto err1;
+        }
+
+        hcd->rsrc_start = res->start;
+        hcd->rsrc_len = res->end - res->start + 1;
+
+        if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
+                                driver->description)) {
+                dev_dbg(dev, "controller already in use\n");
+                retval = -EBUSY;
+                goto err1;
+        }
+
+        hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+        if (hcd->regs == NULL) {
+                dev_dbg(dev, "error mapping memory\n");
+                retval = -EFAULT;
+                goto err2;
+        }
+
+        retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
+        if (retval == 0)
+                return retval;
+
+        iounmap(hcd->regs);
+err2:
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err1:
+        usb_put_hcd(hcd);
+
+        return retval;
+}
+
+static int cns3xxx_ehci_remove(struct platform_device *pdev)
+{
+        struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+        usb_remove_hcd(hcd);
+        iounmap(hcd->regs);
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+
+        /*
+         * EHCI and OHCI share the same clock and power,
+         * resetting twice would cause the 1st controller been reset.
+         * Therefore only do power up  at the first up device, and
+         * power down at the last down device.
+         */
+        if (atomic_dec_return(&usb_pwr_ref) == 0)
+                cns3xxx_pwr_clk_dis(1 << PM_CLK_GATE_REG_OFFSET_USB_HOST);
+
+        usb_put_hcd(hcd);
+
+        platform_set_drvdata(pdev, NULL);
+
+        return 0;
+}
+
+MODULE_ALIAS("platform:cns3xxx-ehci");
+
+static struct platform_driver cns3xxx_ehci_driver = {
+        .probe = cns3xxx_ehci_probe,
+        .remove = cns3xxx_ehci_remove,
+        .driver = {
+                .name = "cns3xxx-ehci",
+        },
+};