| /** |
| * core.c - DesignWare USB3 DRD Controller Core file |
| * |
| * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com |
| * |
| * 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/module.h> |
| #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/of.h> |
| |
| #include <linux/usb/ch9.h> |
| #include <linux/usb/gadget.h> |
| |
| #include "core.h" |
| #include "gadget.h" |
| #include "io.h" |
| |
| #include "debug.h" |
| |
| static char *maximum_speed = "super"; |
| module_param(maximum_speed, charp, 0); |
| MODULE_PARM_DESC(maximum_speed, "Maximum supported speed."); |
| |
| /* -------------------------------------------------------------------------- */ |
| |
| #define DWC3_DEVS_POSSIBLE 32 |
| |
| static DECLARE_BITMAP(dwc3_devs, DWC3_DEVS_POSSIBLE); |
| |
| int dwc3_get_device_id(void) |
| { |
| int id; |
| |
| again: |
| id = find_first_zero_bit(dwc3_devs, DWC3_DEVS_POSSIBLE); |
| if (id < DWC3_DEVS_POSSIBLE) { |
| int old; |
| |
| old = test_and_set_bit(id, dwc3_devs); |
| if (old) |
| goto again; |
| } else { |
| pr_err("dwc3: no space for new device\n"); |
| id = -ENOMEM; |
| } |
| |
| return id; |
| } |
| EXPORT_SYMBOL_GPL(dwc3_get_device_id); |
| |
| void dwc3_put_device_id(int id) |
| { |
| int ret; |
| |
| if (id < 0) |
| return; |
| |
| ret = test_bit(id, dwc3_devs); |
| WARN(!ret, "dwc3: ID %d not in use\n", id); |
| clear_bit(id, dwc3_devs); |
| } |
| EXPORT_SYMBOL_GPL(dwc3_put_device_id); |
| |
| void dwc3_set_mode(struct dwc3 *dwc, u32 mode) |
| { |
| u32 reg; |
| |
| reg = dwc3_readl(dwc->regs, DWC3_GCTL); |
| reg &= ~(DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG)); |
| reg |= DWC3_GCTL_PRTCAPDIR(mode); |
| dwc3_writel(dwc->regs, DWC3_GCTL, reg); |
| } |
| |
| /** |
| * 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); |
| |
| mdelay(100); |
| |
| /* 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 - Allocates 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 success |
| * 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 < dwc->num_event_buffers; i++) { |
| evt = dwc->ev_buffs[i]; |
| if (evt) |
| dwc3_free_one_event_buffer(dwc, evt); |
| } |
| |
| kfree(dwc->ev_buffs); |
| } |
| |
| /** |
| * dwc3_alloc_event_buffers - Allocates @num event buffers of size @length |
| * @dwc: pointer to our controller context structure |
| * @length: size of event buffer |
| * |
| * Returns 0 on success otherwise negative errno. In the error case, dwc |
| * may contain some buffers allocated but not all which were requested. |
| */ |
| static int __devinit dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned length) |
| { |
| int num; |
| int i; |
| |
| num = DWC3_NUM_INT(dwc->hwparams.hwparams1); |
| dwc->num_event_buffers = num; |
| |
| dwc->ev_buffs = kzalloc(sizeof(*dwc->ev_buffs) * num, GFP_KERNEL); |
| if (!dwc->ev_buffs) { |
| dev_err(dwc->dev, "can't allocate event buffers array\n"); |
| return -ENOMEM; |
| } |
| |
| 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 our controller context structure |
| * |
| * Returns 0 on success otherwise negative errno. |
| */ |
| static int dwc3_event_buffers_setup(struct dwc3 *dwc) |
| { |
| struct dwc3_event_buffer *evt; |
| int n; |
| |
| for (n = 0; n < dwc->num_event_buffers; 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); |
| |
| evt->lpos = 0; |
| |
| 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 < dwc->num_event_buffers; n++) { |
| evt = dwc->ev_buffs[n]; |
| |
| evt->lpos = 0; |
| |
| 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); |
| } |
| } |
| |
| static void __devinit dwc3_cache_hwparams(struct dwc3 *dwc) |
| { |
| struct dwc3_hwparams *parms = &dwc->hwparams; |
| |
| parms->hwparams0 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS0); |
| parms->hwparams1 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS1); |
| parms->hwparams2 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS2); |
| parms->hwparams3 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS3); |
| parms->hwparams4 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS4); |
| parms->hwparams5 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS5); |
| parms->hwparams6 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS6); |
| parms->hwparams7 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS7); |
| parms->hwparams8 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS8); |
| } |
| |
| /** |
| * 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; |
| |
| 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; |
| |
| /* 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); |
| |
| dwc3_core_soft_reset(dwc); |
| |
| dwc3_cache_hwparams(dwc); |
| |
| reg = dwc3_readl(dwc->regs, DWC3_GCTL); |
| reg &= ~DWC3_GCTL_SCALEDOWN_MASK; |
| reg &= ~DWC3_GCTL_DISSCRAMBLE; |
| |
| switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1)) { |
| case DWC3_GHWPARAMS1_EN_PWROPT_CLK: |
| reg &= ~DWC3_GCTL_DSBLCLKGTNG; |
| break; |
| default: |
| dev_dbg(dwc->dev, "No power optimization available\n"); |
| } |
| |
| /* |
| * WORKAROUND: DWC3 revisions <1.90a have a bug |
| * where the device can fail to connect at SuperSpeed |
| * and falls back to high-speed mode which causes |
| * the device to enter a Connect/Disconnect loop |
| */ |
| if (dwc->revision < DWC3_REVISION_190A) |
| reg |= DWC3_GCTL_U2RSTECN; |
| |
| dwc3_writel(dwc->regs, DWC3_GCTL, reg); |
| |
| ret = dwc3_alloc_event_buffers(dwc, 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) |
| { |
| struct device_node *node = pdev->dev.of_node; |
| struct resource *res; |
| struct dwc3 *dwc; |
| struct device *dev = &pdev->dev; |
| |
| int ret = -ENOMEM; |
| |
| void __iomem *regs; |
| void *mem; |
| |
| u8 mode; |
| |
| mem = devm_kzalloc(dev, sizeof(*dwc) + DWC3_ALIGN_MASK, GFP_KERNEL); |
| if (!mem) { |
| dev_err(dev, "not enough memory\n"); |
| return -ENOMEM; |
| } |
| dwc = PTR_ALIGN(mem, DWC3_ALIGN_MASK + 1); |
| dwc->mem = mem; |
| |
| res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
| if (!res) { |
| dev_err(dev, "missing IRQ\n"); |
| return -ENODEV; |
| } |
| dwc->xhci_resources[1].start = res->start; |
| dwc->xhci_resources[1].end = res->end; |
| dwc->xhci_resources[1].flags = res->flags; |
| dwc->xhci_resources[1].name = res->name; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (!res) { |
| dev_err(dev, "missing memory resource\n"); |
| return -ENODEV; |
| } |
| dwc->xhci_resources[0].start = res->start; |
| dwc->xhci_resources[0].end = dwc->xhci_resources[0].start + |
| DWC3_XHCI_REGS_END; |
| dwc->xhci_resources[0].flags = res->flags; |
| dwc->xhci_resources[0].name = res->name; |
| |
| /* |
| * Request memory region but exclude xHCI regs, |
| * since it will be requested by the xhci-plat driver. |
| */ |
| res = devm_request_mem_region(dev, res->start + DWC3_GLOBALS_REGS_START, |
| resource_size(res) - DWC3_GLOBALS_REGS_START, |
| dev_name(dev)); |
| if (!res) { |
| dev_err(dev, "can't request mem region\n"); |
| return -ENOMEM; |
| } |
| |
| regs = devm_ioremap(dev, res->start, resource_size(res)); |
| if (!regs) { |
| dev_err(dev, "ioremap failed\n"); |
| return -ENOMEM; |
| } |
| |
| spin_lock_init(&dwc->lock); |
| platform_set_drvdata(pdev, dwc); |
| |
| dwc->regs = regs; |
| dwc->regs_size = resource_size(res); |
| dwc->dev = dev; |
| |
| if (!strncmp("super", maximum_speed, 5)) |
| dwc->maximum_speed = DWC3_DCFG_SUPERSPEED; |
| else if (!strncmp("high", maximum_speed, 4)) |
| dwc->maximum_speed = DWC3_DCFG_HIGHSPEED; |
| else if (!strncmp("full", maximum_speed, 4)) |
| dwc->maximum_speed = DWC3_DCFG_FULLSPEED1; |
| else if (!strncmp("low", maximum_speed, 3)) |
| dwc->maximum_speed = DWC3_DCFG_LOWSPEED; |
| else |
| dwc->maximum_speed = DWC3_DCFG_SUPERSPEED; |
| |
| if (of_get_property(node, "tx-fifo-resize", NULL)) |
| dwc->needs_fifo_resize = true; |
| |
| pm_runtime_enable(dev); |
| pm_runtime_get_sync(dev); |
| pm_runtime_forbid(dev); |
| |
| ret = dwc3_core_init(dwc); |
| if (ret) { |
| dev_err(dev, "failed to initialize core\n"); |
| return ret; |
| } |
| |
| mode = DWC3_MODE(dwc->hwparams.hwparams0); |
| |
| switch (mode) { |
| case DWC3_MODE_DEVICE: |
| dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE); |
| ret = dwc3_gadget_init(dwc); |
| if (ret) { |
| dev_err(dev, "failed to initialize gadget\n"); |
| goto err1; |
| } |
| break; |
| case DWC3_MODE_HOST: |
| dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_HOST); |
| ret = dwc3_host_init(dwc); |
| if (ret) { |
| dev_err(dev, "failed to initialize host\n"); |
| goto err1; |
| } |
| break; |
| case DWC3_MODE_DRD: |
| dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG); |
| ret = dwc3_host_init(dwc); |
| if (ret) { |
| dev_err(dev, "failed to initialize host\n"); |
| goto err1; |
| } |
| |
| ret = dwc3_gadget_init(dwc); |
| if (ret) { |
| dev_err(dev, "failed to initialize gadget\n"); |
| goto err1; |
| } |
| break; |
| default: |
| dev_err(dev, "Unsupported mode of operation %d\n", mode); |
| goto err1; |
| } |
| dwc->mode = mode; |
| |
| ret = dwc3_debugfs_init(dwc); |
| if (ret) { |
| dev_err(dev, "failed to initialize debugfs\n"); |
| goto err2; |
| } |
| |
| pm_runtime_allow(dev); |
| |
| return 0; |
| |
| err2: |
| switch (mode) { |
| case DWC3_MODE_DEVICE: |
| dwc3_gadget_exit(dwc); |
| break; |
| case DWC3_MODE_HOST: |
| dwc3_host_exit(dwc); |
| break; |
| case DWC3_MODE_DRD: |
| dwc3_host_exit(dwc); |
| dwc3_gadget_exit(dwc); |
| break; |
| default: |
| /* do nothing */ |
| break; |
| } |
| |
| err1: |
| dwc3_core_exit(dwc); |
| |
| return ret; |
| } |
| |
| static int __devexit dwc3_remove(struct platform_device *pdev) |
| { |
| struct dwc3 *dwc = platform_get_drvdata(pdev); |
| struct resource *res; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| |
| pm_runtime_put(&pdev->dev); |
| pm_runtime_disable(&pdev->dev); |
| |
| dwc3_debugfs_exit(dwc); |
| |
| switch (dwc->mode) { |
| case DWC3_MODE_DEVICE: |
| dwc3_gadget_exit(dwc); |
| break; |
| case DWC3_MODE_HOST: |
| dwc3_host_exit(dwc); |
| break; |
| case DWC3_MODE_DRD: |
| dwc3_host_exit(dwc); |
| dwc3_gadget_exit(dwc); |
| break; |
| default: |
| /* do nothing */ |
| break; |
| } |
| |
| dwc3_core_exit(dwc); |
| |
| return 0; |
| } |
| |
| static struct platform_driver dwc3_driver = { |
| .probe = dwc3_probe, |
| .remove = __devexit_p(dwc3_remove), |
| .driver = { |
| .name = "dwc3", |
| }, |
| }; |
| |
| module_platform_driver(dwc3_driver); |
| |
| MODULE_ALIAS("platform:dwc3"); |
| MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>"); |
| MODULE_LICENSE("Dual BSD/GPL"); |
| MODULE_DESCRIPTION("DesignWare USB3 DRD Controller Driver"); |