USB: EHCI bus glue for on-chip PMC MSP USB controller

This patch add bus glue for USB controller commonly found in PMC-Sierra MSP71xx family of SoC's.

Signed-off-by: Anoop P A <anoop.pa@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 401 insertions, 2 deletions

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 0e6afa260ed8..923e5a079b59 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -91,17 +91,28 @@ config USB_EHCI_TT_NEWSCHED
 
           If unsure, say Y.
 
+config USB_EHCI_HCD_PMC_MSP
+        tristate "EHCI support for on-chip PMC MSP71xx USB controller"
+        depends on USB_EHCI_HCD && MSP_HAS_USB
+        default n
+        select USB_EHCI_BIG_ENDIAN_DESC
+        select USB_EHCI_BIG_ENDIAN_MMIO
+        ---help---
+                Enables support for the onchip USB controller on the PMC_MSP7100 Family SoC's.
+                If unsure, say N.
+
 config USB_EHCI_BIG_ENDIAN_MMIO
         bool
         depends on USB_EHCI_HCD && (PPC_CELLEB || PPC_PS3 || 440EPX || \
                                     ARCH_IXP4XX || XPS_USB_HCD_XILINX || \
-                                    PPC_MPC512x || CPU_CAVIUM_OCTEON)
+                                    PPC_MPC512x || CPU_CAVIUM_OCTEON || \
+                                    PMC_MSP)
         default y
 
 config USB_EHCI_BIG_ENDIAN_DESC
         bool
         depends on USB_EHCI_HCD && (440EPX || ARCH_IXP4XX || XPS_USB_HCD_XILINX || \
-                                    PPC_MPC512x)
+                                    PPC_MPC512x || PMC_MSP)
         default y
 
 config XPS_USB_HCD_XILINX
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 4c77a818fd80..f69305d3a9b8 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1259,6 +1259,11 @@ MODULE_LICENSE ("GPL");
 #define PLATFORM_DRIVER         ehci_msm_driver
 #endif
 
+#ifdef CONFIG_USB_EHCI_HCD_PMC_MSP
+#include "ehci-pmcmsp.c"
+#define PLATFORM_DRIVER         ehci_hcd_msp_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-pmcmsp.c b/drivers/usb/host/ehci-pmcmsp.c
new file mode 100644
index 000000000000..a2168642175b
--- /dev/null
+++ b/drivers/usb/host/ehci-pmcmsp.c
@@ -0,0 +1,383 @@
+/*
+ * PMC MSP EHCI (Host Controller Driver) for USB.
+ *
+ * (C) Copyright 2006-2010 PMC-Sierra Inc
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ */
+
+/* includes */
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/usb.h>
+#include <msp_usb.h>
+
+/* stream disable*/
+#define USB_CTRL_MODE_STREAM_DISABLE    0x10
+
+/* threshold */
+#define USB_CTRL_FIFO_THRESH            0x00300000
+
+/* register offset for usb_mode */
+#define USB_EHCI_REG_USB_MODE           0x68
+
+/* register offset for usb fifo */
+#define USB_EHCI_REG_USB_FIFO           0x24
+
+/* register offset for usb status */
+#define USB_EHCI_REG_USB_STATUS         0x44
+
+/* serial/parallel transceiver */
+#define USB_EHCI_REG_BIT_STAT_STS       (1<<29)
+
+/* TWI USB0 host device pin */
+#define MSP_PIN_USB0_HOST_DEV           49
+
+/* TWI USB1 host device pin */
+#define MSP_PIN_USB1_HOST_DEV           50
+
+
+static void usb_hcd_tdi_set_mode(struct ehci_hcd *ehci)
+{
+        u8 *base;
+        u8 *statreg;
+        u8 *fiforeg;
+        u32 val;
+        struct ehci_regs *reg_base = ehci->regs;
+
+        /* get register base */
+        base = (u8 *)reg_base + USB_EHCI_REG_USB_MODE;
+        statreg = (u8 *)reg_base + USB_EHCI_REG_USB_STATUS;
+        fiforeg = (u8 *)reg_base + USB_EHCI_REG_USB_FIFO;
+
+        /* Disable controller mode stream */
+        val = ehci_readl(ehci, (u32 *)base);
+        ehci_writel(ehci, (val | USB_CTRL_MODE_STREAM_DISABLE),
+                        (u32 *)base);
+
+        /* clear STS to select parallel transceiver interface */
+        val = ehci_readl(ehci, (u32 *)statreg);
+        val = val & ~USB_EHCI_REG_BIT_STAT_STS;
+        ehci_writel(ehci, val, (u32 *)statreg);
+
+        /* write to set the proper fifo threshold */
+        ehci_writel(ehci, USB_CTRL_FIFO_THRESH, (u32 *)fiforeg);
+
+        /* set TWI GPIO USB_HOST_DEV pin high */
+        gpio_direction_output(MSP_PIN_USB0_HOST_DEV, 1);
+#ifdef CONFIG_MSP_HAS_DUAL_USB
+        gpio_direction_output(MSP_PIN_USB1_HOST_DEV, 1);
+#endif
+}
+
+/* called during probe() after chip reset completes */
+static int ehci_msp_setup(struct usb_hcd *hcd)
+{
+        struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
+        int                     retval;
+        ehci->big_endian_mmio = 1;
+        ehci->big_endian_desc = 1;
+
+        ehci->caps = hcd->regs;
+        ehci->regs = hcd->regs +
+                        HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
+        dbg_hcs_params(ehci, "reset");
+        dbg_hcc_params(ehci, "reset");
+
+        /* cache this readonly data; minimize chip reads */
+        ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
+        hcd->has_tt = 1;
+
+        retval = ehci_halt(ehci);
+        if (retval)
+                return retval;
+
+        ehci_reset(ehci);
+
+        /* data structure init */
+        retval = ehci_init(hcd);
+        if (retval)
+                return retval;
+
+        usb_hcd_tdi_set_mode(ehci);
+        ehci_port_power(ehci, 0);
+
+        return retval;
+}
+
+
+/* configure so an HC device and id are always provided
+ * always called with process context; sleeping is OK
+ */
+
+static int usb_hcd_msp_map_regs(struct mspusb_device *dev)
+{
+        struct resource *res;
+        struct platform_device *pdev = &dev->dev;
+        u32 res_len;
+        int retval;
+
+        /* MAB register space */
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+        if (res == NULL)
+                return -ENOMEM;
+        res_len = res->end - res->start + 1;
+        if (!request_mem_region(res->start, res_len, "mab regs"))
+                return -EBUSY;
+
+        dev->mab_regs = ioremap_nocache(res->start, res_len);
+        if (dev->mab_regs == NULL) {
+                retval = -ENOMEM;
+                goto err1;
+        }
+
+        /* MSP USB register space */
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+        if (res == NULL) {
+                retval = -ENOMEM;
+                goto err2;
+        }
+        res_len = res->end - res->start + 1;
+        if (!request_mem_region(res->start, res_len, "usbid regs")) {
+                retval = -EBUSY;
+                goto err2;
+        }
+        dev->usbid_regs = ioremap_nocache(res->start, res_len);
+        if (dev->usbid_regs == NULL) {
+                retval = -ENOMEM;
+                goto err3;
+        }
+
+        return 0;
+err3:
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+        res_len = res->end - res->start + 1;
+        release_mem_region(res->start, res_len);
+err2:
+        iounmap(dev->mab_regs);
+err1:
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+        res_len = res->end - res->start + 1;
+        release_mem_region(res->start, res_len);
+        dev_err(&pdev->dev, "Failed to map non-EHCI regs.\n");
+        return retval;
+}
+
+/**
+ * usb_hcd_msp_probe - initialize PMC MSP-based HCDs
+ * Context: !in_interrupt()
+ *
+ * Allocates basic resources for this USB host controller, and
+ * then invokes the start() method for the HCD associated with it
+ * through the hotplug entry's driver_data.
+ *
+ */
+int usb_hcd_msp_probe(const struct hc_driver *driver,
+                          struct platform_device *dev)
+{
+        int retval;
+        struct usb_hcd *hcd;
+        struct resource *res;
+        struct ehci_hcd         *ehci ;
+
+        hcd = usb_create_hcd(driver, &dev->dev, "pmcmsp");
+        if (!hcd)
+                return -ENOMEM;
+
+        res = platform_get_resource(dev, IORESOURCE_MEM, 0);
+        if (res == NULL) {
+                pr_debug("No IOMEM resource info for %s.\n", dev->name);
+                retval = -ENOMEM;
+                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, dev->name)) {
+                retval = -EBUSY;
+                goto err1;
+        }
+        hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
+        if (!hcd->regs) {
+                pr_debug("ioremap failed");
+                retval = -ENOMEM;
+                goto err2;
+        }
+
+        res = platform_get_resource(dev, IORESOURCE_IRQ, 0);
+        if (res == NULL) {
+                dev_err(&dev->dev, "No IRQ resource info for %s.\n", dev->name);
+                retval = -ENOMEM;
+                goto err3;
+        }
+
+        /* Map non-EHCI register spaces */
+        retval = usb_hcd_msp_map_regs(to_mspusb_device(dev));
+        if (retval != 0)
+                goto err3;
+
+        ehci = hcd_to_ehci(hcd);
+        ehci->big_endian_mmio = 1;
+        ehci->big_endian_desc = 1;
+
+
+        retval = usb_add_hcd(hcd, res->start, IRQF_SHARED);
+        if (retval == 0)
+                return 0;
+
+        usb_remove_hcd(hcd);
+err3:
+        iounmap(hcd->regs);
+err2:
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err1:
+        usb_put_hcd(hcd);
+
+        return retval;
+}
+
+
+
+/**
+ * usb_hcd_msp_remove - shutdown processing for PMC MSP-based HCDs
+ * @dev: USB Host Controller being removed
+ * Context: !in_interrupt()
+ *
+ * Reverses the effect of usb_hcd_msp_probe(), first invoking
+ * the HCD's stop() method.  It is always called from a thread
+ * context, normally "rmmod", "apmd", or something similar.
+ *
+ * may be called without controller electrically present
+ * may be called with controller, bus, and devices active
+ */
+void usb_hcd_msp_remove(struct usb_hcd *hcd, struct platform_device *dev)
+{
+        usb_remove_hcd(hcd);
+        iounmap(hcd->regs);
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+        usb_put_hcd(hcd);
+}
+
+#ifdef CONFIG_MSP_HAS_DUAL_USB
+/*
+ * Wrapper around the main ehci_irq.  Since both USB host controllers are
+ * sharing the same IRQ, need to first determine whether we're the intended
+ * recipient of this interrupt.
+ */
+static irqreturn_t ehci_msp_irq(struct usb_hcd *hcd)
+{
+        u32 int_src;
+        struct device *dev = hcd->self.controller;
+        struct platform_device *pdev;
+        struct mspusb_device *mdev;
+        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+        /* need to reverse-map a couple of containers to get our device */
+        pdev = to_platform_device(dev);
+        mdev = to_mspusb_device(pdev);
+
+        /* Check to see if this interrupt is for this host controller */
+        int_src = ehci_readl(ehci, &mdev->mab_regs->int_stat);
+        if (int_src & (1 << pdev->id))
+                return ehci_irq(hcd);
+
+        /* Not for this device */
+        return IRQ_NONE;
+}
+#endif /* DUAL_USB */
+
+static const struct hc_driver ehci_msp_hc_driver = {
+        .description =          hcd_name,
+        .product_desc =         "PMC MSP EHCI",
+        .hcd_priv_size =        sizeof(struct ehci_hcd),
+
+        /*
+         * generic hardware linkage
+         */
+#ifdef CONFIG_MSP_HAS_DUAL_USB
+        .irq =                  ehci_msp_irq,
+#else
+        .irq =                  ehci_irq,
+#endif
+        .flags =                HCD_MEMORY | HCD_USB2,
+
+        /*
+         * basic lifecycle operations
+         */
+        .reset =                ehci_msp_setup,
+        .start =                ehci_run,
+        .shutdown               = ehci_shutdown,
+        .start                  = ehci_run,
+        .stop                   = ehci_stop,
+
+        /*
+         * 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,
+        .bus_suspend            = ehci_bus_suspend,
+        .bus_resume             = ehci_bus_resume,
+        .relinquish_port        = ehci_relinquish_port,
+        .port_handed_over       = ehci_port_handed_over,
+
+        .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
+};
+
+static int ehci_hcd_msp_drv_probe(struct platform_device *pdev)
+{
+        int ret;
+
+        pr_debug("In ehci_hcd_msp_drv_probe");
+
+        if (usb_disabled())
+                return -ENODEV;
+
+        gpio_request(MSP_PIN_USB0_HOST_DEV, "USB0_HOST_DEV_GPIO");
+#ifdef CONFIG_MSP_HAS_DUAL_USB
+        gpio_request(MSP_PIN_USB1_HOST_DEV, "USB1_HOST_DEV_GPIO");
+#endif
+
+        ret = usb_hcd_msp_probe(&ehci_msp_hc_driver, pdev);
+
+        return ret;
+}
+
+static int ehci_hcd_msp_drv_remove(struct platform_device *pdev)
+{
+        struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+        usb_hcd_msp_remove(hcd, pdev);
+
+        /* free TWI GPIO USB_HOST_DEV pin */
+        gpio_free(MSP_PIN_USB0_HOST_DEV);
+#ifdef CONFIG_MSP_HAS_DUAL_USB
+        gpio_free(MSP_PIN_USB1_HOST_DEV);
+#endif
+
+        return 0;
+}
+
+MODULE_ALIAS("pmcmsp-ehci");
+
+static struct platform_driver ehci_hcd_msp_driver = {
+        .probe          = ehci_hcd_msp_drv_probe,
+        .remove         = ehci_hcd_msp_drv_remove,
+        .driver         = {
+                .name   = "pmcmsp-ehci",
+                .owner  = THIS_MODULE,
+        },
+};