diff options
Diffstat (limited to 'drivers/usb/dwc3/core.c')
| -rw-r--r-- | drivers/usb/dwc3/core.c | 467 |
1 files changed, 467 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c new file mode 100644 index 00000000000..443e4fb9b8f --- /dev/null +++ b/drivers/usb/dwc3/core.c @@ -0,0 +1,467 @@ +/** + * 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); |