Adds a nolock function to the w1 interface to avoid locking the

[linux-2.6/next.git] / drivers / usb / dwc3 / core.c

/**
 * core.c - DesignWare USB3 DRD Controller Core file
 *
 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
 * All rights reserved.
 *
 * Authors: Felipe Balbi <balbi@ti.com>,
 *          Sebastian Andrzej Siewior <bigeasy@linutronix.de>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The names of the above-listed copyright holders may not be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * ALTERNATIVELY, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2, as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <linux/list.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>

#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>

#include "core.h"
#include "gadget.h"
#include "io.h"

#include "debug.h"

/**
 * dwc3_core_soft_reset - Issues core soft reset and PHY reset
 * @dwc: pointer to our context structure
 */
static void dwc3_core_soft_reset(struct dwc3 *dwc)
{
        u32             reg;

        /* Before Resetting PHY, put Core in Reset */
        reg = dwc3_readl(dwc->regs, DWC3_GCTL);
        reg |= DWC3_GCTL_CORESOFTRESET;
        dwc3_writel(dwc->regs, DWC3_GCTL, reg);

        /* Assert USB3 PHY reset */
        reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
        reg |= DWC3_GUSB3PIPECTL_PHYSOFTRST;
        dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);

        /* Assert USB2 PHY reset */
        reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
        reg |= DWC3_GUSB2PHYCFG_PHYSOFTRST;
        dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);

        mdelay(100);

        /* Clear USB3 PHY reset */
        reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
        reg &= ~DWC3_GUSB3PIPECTL_PHYSOFTRST;
        dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);

        /* Clear USB2 PHY reset */
        reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
        reg &= ~DWC3_GUSB2PHYCFG_PHYSOFTRST;
        dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);

        /* After PHYs are stable we can take Core out of reset state */
        reg = dwc3_readl(dwc->regs, DWC3_GCTL);
        reg &= ~DWC3_GCTL_CORESOFTRESET;
        dwc3_writel(dwc->regs, DWC3_GCTL, reg);
}

/**
 * dwc3_free_one_event_buffer - Frees one event buffer
 * @dwc: Pointer to our controller context structure
 * @evt: Pointer to event buffer to be freed
 */
static void dwc3_free_one_event_buffer(struct dwc3 *dwc,
                struct dwc3_event_buffer *evt)
{
        dma_free_coherent(dwc->dev, evt->length, evt->buf, evt->dma);
        kfree(evt);
}

/**
 * dwc3_alloc_one_event_buffer - Allocated one event buffer structure
 * @dwc: Pointer to our controller context structure
 * @length: size of the event buffer
 *
 * Returns a pointer to the allocated event buffer structure on succes
 * otherwise ERR_PTR(errno).
 */
static struct dwc3_event_buffer *__devinit
dwc3_alloc_one_event_buffer(struct dwc3 *dwc, unsigned length)
{
        struct dwc3_event_buffer        *evt;

        evt = kzalloc(sizeof(*evt), GFP_KERNEL);
        if (!evt)
                return ERR_PTR(-ENOMEM);

        evt->dwc        = dwc;
        evt->length     = length;
        evt->buf        = dma_alloc_coherent(dwc->dev, length,
                        &evt->dma, GFP_KERNEL);
        if (!evt->buf) {
                kfree(evt);
                return ERR_PTR(-ENOMEM);
        }

        return evt;
}

/**
 * dwc3_free_event_buffers - frees all allocated event buffers
 * @dwc: Pointer to our controller context structure
 */
static void dwc3_free_event_buffers(struct dwc3 *dwc)
{
        struct dwc3_event_buffer        *evt;
        int i;

        for (i = 0; i < DWC3_EVENT_BUFFERS_NUM; i++) {
                evt = dwc->ev_buffs[i];
                if (evt) {
                        dwc3_free_one_event_buffer(dwc, evt);
                        dwc->ev_buffs[i] = NULL;
                }
        }
}

/**
 * dwc3_alloc_event_buffers - Allocates @num event buffers of size @length
 * @dwc: Pointer to out controller context structure
 * @num: number of event buffers to allocate
 * @length: size of event buffer
 *
 * Returns 0 on success otherwise negative errno. In error the case, dwc
 * may contain some buffers allocated but not all which were requested.
 */
static int __devinit dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned num,
                unsigned length)
{
        int                     i;

        for (i = 0; i < num; i++) {
                struct dwc3_event_buffer        *evt;

                evt = dwc3_alloc_one_event_buffer(dwc, length);
                if (IS_ERR(evt)) {
                        dev_err(dwc->dev, "can't allocate event buffer\n");
                        return PTR_ERR(evt);
                }
                dwc->ev_buffs[i] = evt;
        }

        return 0;
}

/**
 * dwc3_event_buffers_setup - setup our allocated event buffers
 * @dwc: Pointer to out controller context structure
 *
 * Returns 0 on success otherwise negative errno.
 */
static int __devinit dwc3_event_buffers_setup(struct dwc3 *dwc)
{
        struct dwc3_event_buffer        *evt;
        int                             n;

        for (n = 0; n < DWC3_EVENT_BUFFERS_NUM; n++) {
                evt = dwc->ev_buffs[n];
                dev_dbg(dwc->dev, "Event buf %p dma %08llx length %d\n",
                                evt->buf, (unsigned long long) evt->dma,
                                evt->length);

                dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(n),
                                lower_32_bits(evt->dma));
                dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(n),
                                upper_32_bits(evt->dma));
                dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(n),
                                evt->length & 0xffff);
                dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(n), 0);
        }

        return 0;
}

static void dwc3_event_buffers_cleanup(struct dwc3 *dwc)
{
        struct dwc3_event_buffer        *evt;
        int                             n;

        for (n = 0; n < DWC3_EVENT_BUFFERS_NUM; n++) {
                evt = dwc->ev_buffs[n];
                dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(n), 0);
                dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(n), 0);
                dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(n), 0);
                dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(n), 0);
        }
}

/**
 * dwc3_core_init - Low-level initialization of DWC3 Core
 * @dwc: Pointer to our controller context structure
 *
 * Returns 0 on success otherwise negative errno.
 */
static int __devinit dwc3_core_init(struct dwc3 *dwc)
{
        unsigned long           timeout;
        u32                     reg;
        int                     ret;

        dwc3_core_soft_reset(dwc);

        /* issue device SoftReset too */
        timeout = jiffies + msecs_to_jiffies(500);
        dwc3_writel(dwc->regs, DWC3_DCTL, DWC3_DCTL_CSFTRST);
        do {
                reg = dwc3_readl(dwc->regs, DWC3_DCTL);
                if (!(reg & DWC3_DCTL_CSFTRST))
                        break;

                if (time_after(jiffies, timeout)) {
                        dev_err(dwc->dev, "Reset Timed Out\n");
                        ret = -ETIMEDOUT;
                        goto err0;
                }

                cpu_relax();
        } while (true);

        reg = dwc3_readl(dwc->regs, DWC3_GSNPSID);
        /* This should read as U3 followed by revision number */
        if ((reg & DWC3_GSNPSID_MASK) != 0x55330000) {
                dev_err(dwc->dev, "this is not a DesignWare USB3 DRD Core\n");
                ret = -ENODEV;
                goto err0;
        }

        dwc->revision = reg & DWC3_GSNPSREV_MASK;

        ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_NUM,
                        DWC3_EVENT_BUFFERS_SIZE);
        if (ret) {
                dev_err(dwc->dev, "failed to allocate event buffers\n");
                ret = -ENOMEM;
                goto err1;
        }

        ret = dwc3_event_buffers_setup(dwc);
        if (ret) {
                dev_err(dwc->dev, "failed to setup event buffers\n");
                goto err1;
        }

        return 0;

err1:
        dwc3_free_event_buffers(dwc);

err0:
        return ret;
}

static void dwc3_core_exit(struct dwc3 *dwc)
{
        dwc3_event_buffers_cleanup(dwc);
        dwc3_free_event_buffers(dwc);
}

#define DWC3_ALIGN_MASK         (16 - 1)

static int __devinit dwc3_probe(struct platform_device *pdev)
{
        const struct platform_device_id *id = platform_get_device_id(pdev);
        struct resource         *res;
        struct dwc3             *dwc;
        void __iomem            *regs;
        unsigned int            features = id->driver_data;
        int                     ret = -ENOMEM;
        int                     irq;
        void                    *mem;

        mem = kzalloc(sizeof(*dwc) + DWC3_ALIGN_MASK, GFP_KERNEL);
        if (!mem) {
                dev_err(&pdev->dev, "not enough memory\n");
                goto err0;
        }
        dwc = PTR_ALIGN(mem, DWC3_ALIGN_MASK + 1);
        dwc->mem = mem;

        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (!res) {
                dev_err(&pdev->dev, "missing resource\n");
                goto err1;
        }

        res = request_mem_region(res->start, resource_size(res),
                        dev_name(&pdev->dev));
        if (!res) {
                dev_err(&pdev->dev, "can't request mem region\n");
                goto err1;
        }

        regs = ioremap(res->start, resource_size(res));
        if (!regs) {
                dev_err(&pdev->dev, "ioremap failed\n");
                goto err2;
        }

        irq = platform_get_irq(pdev, 0);
        if (irq < 0) {
                dev_err(&pdev->dev, "missing IRQ\n");
                goto err3;
        }

        spin_lock_init(&dwc->lock);
        platform_set_drvdata(pdev, dwc);

        dwc->regs       = regs;
        dwc->regs_size  = resource_size(res);
        dwc->dev        = &pdev->dev;
        dwc->irq        = irq;

        pm_runtime_enable(&pdev->dev);
        pm_runtime_get_sync(&pdev->dev);
        pm_runtime_forbid(&pdev->dev);

        ret = dwc3_core_init(dwc);
        if (ret) {
                dev_err(&pdev->dev, "failed to initialize core\n");
                goto err3;
        }

        if (features & DWC3_HAS_PERIPHERAL) {
                ret = dwc3_gadget_init(dwc);
                if (ret) {
                        dev_err(&pdev->dev, "failed to initialized gadget\n");
                        goto err4;
                }
        }

        ret = dwc3_debugfs_init(dwc);
        if (ret) {
                dev_err(&pdev->dev, "failed to initialize debugfs\n");
                goto err5;
        }

        pm_runtime_allow(&pdev->dev);

        return 0;

err5:
        if (features & DWC3_HAS_PERIPHERAL)
                dwc3_gadget_exit(dwc);

err4:
        dwc3_core_exit(dwc);

err3:
        iounmap(regs);

err2:
        release_mem_region(res->start, resource_size(res));

err1:
        kfree(dwc->mem);

err0:
        return ret;
}

static int __devexit dwc3_remove(struct platform_device *pdev)
{
        const struct platform_device_id *id = platform_get_device_id(pdev);
        struct dwc3     *dwc = platform_get_drvdata(pdev);
        struct resource *res;
        unsigned int    features = id->driver_data;

        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

        pm_runtime_put(&pdev->dev);
        pm_runtime_disable(&pdev->dev);

        dwc3_debugfs_exit(dwc);

        if (features & DWC3_HAS_PERIPHERAL)
                dwc3_gadget_exit(dwc);

        dwc3_core_exit(dwc);
        release_mem_region(res->start, resource_size(res));
        iounmap(dwc->regs);
        kfree(dwc->mem);

        return 0;
}

static const struct platform_device_id dwc3_id_table[] __devinitconst = {
        {
                .name   = "dwc3-omap",
                .driver_data = (DWC3_HAS_PERIPHERAL
                        | DWC3_HAS_XHCI
                        | DWC3_HAS_OTG),
        },
        {
                .name   = "dwc3-pci",
                .driver_data = DWC3_HAS_PERIPHERAL,
        },
        {  },   /* Terminating Entry */
};
MODULE_DEVICE_TABLE(platform, dwc3_id_table);

static struct platform_driver dwc3_driver = {
        .probe          = dwc3_probe,
        .remove         = __devexit_p(dwc3_remove),
        .driver         = {
                .name   = "dwc3",
        },
        .id_table       = dwc3_id_table,
};

MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("DesignWare USB3 DRD Controller Driver");

static int __devinit dwc3_init(void)
{
        return platform_driver_register(&dwc3_driver);
}
module_init(dwc3_init);

static void __exit dwc3_exit(void)
{
        platform_driver_unregister(&dwc3_driver);
}
module_exit(dwc3_exit);