USB: EHCI: Add MSM Host Controller driver

This patch adds support for EHCI compliant HSUSB Host controller found
on MSM chips.  The root hub has a single port and TT is built into it.
This driver depends on OTG driver for PHY initialization, clock
management and powering up VBUS.

Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 306 insertions, 0 deletions

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 6a7c688b4781..d8665ec0565b 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -141,6 +141,17 @@ config USB_EHCI_HCD_OMAP
           Enables support for the on-chip EHCI controller on
           OMAP3 and later chips.
 
+config USB_EHCI_MSM
+        bool "Support for MSM on-chip EHCI USB controller"
+        depends on USB_EHCI_HCD && ARCH_MSM
+        select USB_EHCI_ROOT_HUB_TT
+        select USB_MSM_OTG_72K
+        ---help---
+          Enables support for the USB Host controller present on the
+          Qualcomm chipsets. Root Hub has inbuilt TT.
+          This driver depends on OTG driver for PHY initialization,
+          clock management, powering up VBUS.
+
 config USB_EHCI_HCD_PPC_OF
         bool "EHCI support for PPC USB controller on OF platform bus"
         depends on USB_EHCI_HCD && PPC_OF
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 6778fbcf2416..48021d26024c 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1239,6 +1239,11 @@ MODULE_LICENSE ("GPL");
 #define PLATFORM_DRIVER         spear_ehci_hcd_driver
 #endif
 
+#ifdef CONFIG_USB_EHCI_MSM
+#include "ehci-msm.c"
+#define PLATFORM_DRIVER         ehci_msm_driver
+#endif
+
 #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \
     !defined(PS3_SYSTEM_BUS_DRIVER) && !defined(OF_PLATFORM_DRIVER) && \
     !defined(XILINX_OF_PLATFORM_DRIVER)
diff --git a/drivers/usb/host/ehci-msm.c b/drivers/usb/host/ehci-msm.c
new file mode 100644
index 000000000000..9ed855986599
--- /dev/null
+++ b/drivers/usb/host/ehci-msm.c
@@ -0,0 +1,290 @@
+/* ehci-msm.c - HSUSB Host Controller Driver Implementation
+ *
+ * Copyright (c) 2008-2010, Code Aurora Forum. All rights reserved.
+ *
+ * Partly derived from ehci-fsl.c and ehci-hcd.c
+ * Copyright (c) 2000-2004 by David Brownell
+ * Copyright (c) 2005 MontaVista Software
+ *
+ * All source code in this file is licensed under the following license except
+ * where indicated.
+ *
+ * This program 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * See the GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you can find it at http://www.fsf.org
+ */
+
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+
+#include <linux/usb/otg.h>
+#include <linux/usb/msm_hsusb_hw.h>
+
+#define MSM_USB_BASE (hcd->regs)
+
+static struct otg_transceiver *otg;
+
+/*
+ * ehci_run defined in drivers/usb/host/ehci-hcd.c reset the controller and
+ * the configuration settings in ehci_msm_reset vanish after controller is
+ * reset. Resetting the controler in ehci_run seems to be un-necessary
+ * provided HCD reset the controller before calling ehci_run. Most of the HCD
+ * do but some are not. So this function is same as ehci_run but we don't
+ * reset the controller here.
+ */
+static int ehci_msm_run(struct usb_hcd *hcd)
+{
+        struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
+        u32                     temp;
+        u32                     hcc_params;
+
+        hcd->uses_new_polling = 1;
+
+        ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
+        ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
+
+        /*
+         * hcc_params controls whether ehci->regs->segment must (!!!)
+         * be used; it constrains QH/ITD/SITD and QTD locations.
+         * pci_pool consistent memory always uses segment zero.
+         * streaming mappings for I/O buffers, like pci_map_single(),
+         * can return segments above 4GB, if the device allows.
+         *
+         * NOTE:  the dma mask is visible through dma_supported(), so
+         * drivers can pass this info along ... like NETIF_F_HIGHDMA,
+         * Scsi_Host.highmem_io, and so forth.  It's readonly to all
+         * host side drivers though.
+         */
+        hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
+        if (HCC_64BIT_ADDR(hcc_params))
+                ehci_writel(ehci, 0, &ehci->regs->segment);
+
+        /*
+         * Philips, Intel, and maybe others need CMD_RUN before the
+         * root hub will detect new devices (why?); NEC doesn't
+         */
+        ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
+        ehci->command |= CMD_RUN;
+        ehci_writel(ehci, ehci->command, &ehci->regs->command);
+        dbg_cmd(ehci, "init", ehci->command);
+
+        /*
+         * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
+         * are explicitly handed to companion controller(s), so no TT is
+         * involved with the root hub.  (Except where one is integrated,
+         * and there's no companion controller unless maybe for USB OTG.)
+         *
+         * Turning on the CF flag will transfer ownership of all ports
+         * from the companions to the EHCI controller.  If any of the
+         * companions are in the middle of a port reset at the time, it
+         * could cause trouble.  Write-locking ehci_cf_port_reset_rwsem
+         * guarantees that no resets are in progress.  After we set CF,
+         * a short delay lets the hardware catch up; new resets shouldn't
+         * be started before the port switching actions could complete.
+         */
+        down_write(&ehci_cf_port_reset_rwsem);
+        hcd->state = HC_STATE_RUNNING;
+        ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
+        ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
+        usleep_range(5000, 5500);
+        up_write(&ehci_cf_port_reset_rwsem);
+        ehci->last_periodic_enable = ktime_get_real();
+
+        temp = HC_VERSION(ehci_readl(ehci, &ehci->caps->hc_capbase));
+        ehci_info(ehci,
+                "USB %x.%x started, EHCI %x.%02x%s\n",
+                ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
+                temp >> 8, temp & 0xff,
+                ignore_oc ? ", overcurrent ignored" : "");
+
+        ehci_writel(ehci, INTR_MASK,
+                    &ehci->regs->intr_enable); /* Turn On Interrupts */
+
+        /* GRR this is run-once init(), being done every time the HC starts.
+         * So long as they're part of class devices, we can't do it init()
+         * since the class device isn't created that early.
+         */
+        create_debug_files(ehci);
+        create_companion_file(ehci);
+
+        return 0;
+}
+
+static int ehci_msm_reset(struct usb_hcd *hcd)
+{
+        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+        int retval;
+
+        ehci->caps = USB_CAPLENGTH;
+        ehci->regs = USB_CAPLENGTH +
+                HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
+
+        /* cache the data to minimize the chip reads*/
+        ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
+
+        hcd->has_tt = 1;
+        ehci->sbrn = HCD_USB2;
+
+        /* data structure init */
+        retval = ehci_init(hcd);
+        if (retval)
+                return retval;
+
+        retval = ehci_reset(ehci);
+        if (retval)
+                return retval;
+
+        /* bursts of unspecified length. */
+        writel(0, USB_AHBBURST);
+        /* Use the AHB transactor */
+        writel(0, USB_AHBMODE);
+        /* Disable streaming mode and select host mode */
+        writel(0x13, USB_USBMODE);
+
+        ehci_port_power(ehci, 1);
+        return 0;
+}
+
+static struct hc_driver msm_hc_driver = {
+        .description            = hcd_name,
+        .product_desc           = "Qualcomm On-Chip EHCI Host Controller",
+        .hcd_priv_size          = sizeof(struct ehci_hcd),
+
+        /*
+         * generic hardware linkage
+         */
+        .irq                    = ehci_irq,
+        .flags                  = HCD_USB2 | HCD_MEMORY,
+
+        .reset                  = ehci_msm_reset,
+        .start                  = ehci_msm_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,
+        .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
+
+        /*
+         * scheduling support
+         */
+        .get_frame_number       = ehci_get_frame,
+
+        /*
+         * root hub support
+         */
+        .hub_status_data        = ehci_hub_status_data,
+        .hub_control            = ehci_hub_control,
+        .relinquish_port        = ehci_relinquish_port,
+        .port_handed_over       = ehci_port_handed_over,
+
+        /*
+         * PM support
+         */
+        .bus_suspend            = ehci_bus_suspend,
+        .bus_resume             = ehci_bus_resume,
+};
+
+static int ehci_msm_probe(struct platform_device *pdev)
+{
+        struct usb_hcd *hcd;
+        struct resource *res;
+        int ret;
+
+        dev_dbg(&pdev->dev, "ehci_msm proble\n");
+
+        hcd = usb_create_hcd(&msm_hc_driver, &pdev->dev, dev_name(&pdev->dev));
+        if (!hcd) {
+                dev_err(&pdev->dev, "Unable to create HCD\n");
+                return  -ENOMEM;
+        }
+
+        hcd->irq = platform_get_irq(pdev, 0);
+        if (hcd->irq < 0) {
+                dev_err(&pdev->dev, "Unable to get IRQ resource\n");
+                ret = hcd->irq;
+                goto put_hcd;
+        }
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                dev_err(&pdev->dev, "Unable to get memory resource\n");
+                ret = -ENODEV;
+                goto put_hcd;
+        }
+
+        hcd->rsrc_start = res->start;
+        hcd->rsrc_len = resource_size(res);
+        hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+        if (!hcd->regs) {
+                dev_err(&pdev->dev, "ioremap failed\n");
+                ret = -ENOMEM;
+                goto put_hcd;
+        }
+
+        /*
+         * OTG driver takes care of PHY initialization, clock management,
+         * powering up VBUS and mapping of registers address space.
+         */
+        otg = otg_get_transceiver();
+        if (!otg) {
+                dev_err(&pdev->dev, "unable to find transceiver\n");
+                ret = -ENODEV;
+                goto unmap;
+        }
+
+        ret = otg_set_host(otg, &hcd->self);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "unable to register with transceiver\n");
+                goto put_transceiver;
+        }
+
+        device_init_wakeup(&pdev->dev, 1);
+        return 0;
+
+put_transceiver:
+        otg_put_transceiver(otg);
+unmap:
+        iounmap(hcd->regs);
+put_hcd:
+        usb_put_hcd(hcd);
+
+        return ret;
+}
+
+static int __devexit ehci_msm_remove(struct platform_device *pdev)
+{
+        struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+        device_init_wakeup(&pdev->dev, 0);
+
+        otg_set_host(otg, NULL);
+        otg_put_transceiver(otg);
+
+        usb_put_hcd(hcd);
+
+        return 0;
+}
+
+static struct platform_driver ehci_msm_driver = {
+        .probe  = ehci_msm_probe,
+        .remove = __devexit_p(ehci_msm_remove),
+        .driver = {
+                   .name = "msm_hsusb_host",
+        },
+};