diff options
Diffstat (limited to 'drivers/usb/gadget/udc/aspeed-vhub')
| -rw-r--r-- | drivers/usb/gadget/udc/aspeed-vhub/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/usb/gadget/udc/aspeed-vhub/Makefile | 4 | ||||
| -rw-r--r-- | drivers/usb/gadget/udc/aspeed-vhub/core.c | 426 | ||||
| -rw-r--r-- | drivers/usb/gadget/udc/aspeed-vhub/dev.c | 589 | ||||
| -rw-r--r-- | drivers/usb/gadget/udc/aspeed-vhub/ep0.c | 495 | ||||
| -rw-r--r-- | drivers/usb/gadget/udc/aspeed-vhub/epn.c | 854 | ||||
| -rw-r--r-- | drivers/usb/gadget/udc/aspeed-vhub/hub.c | 829 | ||||
| -rw-r--r-- | drivers/usb/gadget/udc/aspeed-vhub/vhub.h | 547 |
8 files changed, 3752 insertions, 0 deletions
diff --git a/drivers/usb/gadget/udc/aspeed-vhub/Kconfig b/drivers/usb/gadget/udc/aspeed-vhub/Kconfig new file mode 100644 index 000000000..83ba8a2eb --- /dev/null +++ b/drivers/usb/gadget/udc/aspeed-vhub/Kconfig @@ -0,0 +1,8 @@ +# SPDX-License-Identifier: GPL-2.0+ +config USB_ASPEED_VHUB + tristate "Aspeed vHub UDC driver" + depends on ARCH_ASPEED || COMPILE_TEST + depends on USB_LIBCOMPOSITE + help + USB peripheral controller for the Aspeed AST2500 family + SoCs supporting the "vHub" functionality and USB2.0 diff --git a/drivers/usb/gadget/udc/aspeed-vhub/Makefile b/drivers/usb/gadget/udc/aspeed-vhub/Makefile new file mode 100644 index 000000000..9f3add605 --- /dev/null +++ b/drivers/usb/gadget/udc/aspeed-vhub/Makefile @@ -0,0 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0+ +obj-$(CONFIG_USB_ASPEED_VHUB) += aspeed-vhub.o +aspeed-vhub-y := core.o ep0.o epn.o dev.o hub.o + diff --git a/drivers/usb/gadget/udc/aspeed-vhub/core.c b/drivers/usb/gadget/udc/aspeed-vhub/core.c new file mode 100644 index 000000000..902e61be4 --- /dev/null +++ b/drivers/usb/gadget/udc/aspeed-vhub/core.c @@ -0,0 +1,426 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * aspeed-vhub -- Driver for Aspeed SoC "vHub" USB gadget + * + * core.c - Top level support + * + * Copyright 2017 IBM Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/delay.h> +#include <linux/ioport.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/list.h> +#include <linux/interrupt.h> +#include <linux/proc_fs.h> +#include <linux/prefetch.h> +#include <linux/clk.h> +#include <linux/usb/gadget.h> +#include <linux/of.h> +#include <linux/of_gpio.h> +#include <linux/regmap.h> +#include <linux/dma-mapping.h> + +#include "vhub.h" + +void ast_vhub_done(struct ast_vhub_ep *ep, struct ast_vhub_req *req, + int status) +{ + bool internal = req->internal; + struct ast_vhub *vhub = ep->vhub; + + EPVDBG(ep, "completing request @%p, status %d\n", req, status); + + list_del_init(&req->queue); + + if (req->req.status == -EINPROGRESS) + req->req.status = status; + + if (req->req.dma) { + if (!WARN_ON(!ep->dev)) + usb_gadget_unmap_request_by_dev(&vhub->pdev->dev, + &req->req, ep->epn.is_in); + req->req.dma = 0; + } + + /* + * If this isn't an internal EP0 request, call the core + * to call the gadget completion. + */ + if (!internal) { + spin_unlock(&ep->vhub->lock); + usb_gadget_giveback_request(&ep->ep, &req->req); + spin_lock(&ep->vhub->lock); + } +} + +void ast_vhub_nuke(struct ast_vhub_ep *ep, int status) +{ + struct ast_vhub_req *req; + + EPDBG(ep, "Nuking\n"); + + /* Beware, lock will be dropped & req-acquired by done() */ + while (!list_empty(&ep->queue)) { + req = list_first_entry(&ep->queue, struct ast_vhub_req, queue); + ast_vhub_done(ep, req, status); + } +} + +struct usb_request *ast_vhub_alloc_request(struct usb_ep *u_ep, + gfp_t gfp_flags) +{ + struct ast_vhub_req *req; + + req = kzalloc(sizeof(*req), gfp_flags); + if (!req) + return NULL; + return &req->req; +} + +void ast_vhub_free_request(struct usb_ep *u_ep, struct usb_request *u_req) +{ + struct ast_vhub_req *req = to_ast_req(u_req); + + kfree(req); +} + +static irqreturn_t ast_vhub_irq(int irq, void *data) +{ + struct ast_vhub *vhub = data; + irqreturn_t iret = IRQ_NONE; + u32 istat; + + /* Stale interrupt while tearing down */ + if (!vhub->ep0_bufs) + return IRQ_NONE; + + spin_lock(&vhub->lock); + + /* Read and ACK interrupts */ + istat = readl(vhub->regs + AST_VHUB_ISR); + if (!istat) + goto bail; + writel(istat, vhub->regs + AST_VHUB_ISR); + iret = IRQ_HANDLED; + + UDCVDBG(vhub, "irq status=%08x, ep_acks=%08x ep_nacks=%08x\n", + istat, + readl(vhub->regs + AST_VHUB_EP_ACK_ISR), + readl(vhub->regs + AST_VHUB_EP_NACK_ISR)); + + /* Handle generic EPs first */ + if (istat & VHUB_IRQ_EP_POOL_ACK_STALL) { + u32 i, ep_acks = readl(vhub->regs + AST_VHUB_EP_ACK_ISR); + writel(ep_acks, vhub->regs + AST_VHUB_EP_ACK_ISR); + + for (i = 0; ep_acks && i < AST_VHUB_NUM_GEN_EPs; i++) { + u32 mask = VHUB_EP_IRQ(i); + if (ep_acks & mask) { + ast_vhub_epn_ack_irq(&vhub->epns[i]); + ep_acks &= ~mask; + } + } + } + + /* Handle device interrupts */ + if (istat & (VHUB_IRQ_DEVICE1 | + VHUB_IRQ_DEVICE2 | + VHUB_IRQ_DEVICE3 | + VHUB_IRQ_DEVICE4 | + VHUB_IRQ_DEVICE5)) { + if (istat & VHUB_IRQ_DEVICE1) + ast_vhub_dev_irq(&vhub->ports[0].dev); + if (istat & VHUB_IRQ_DEVICE2) + ast_vhub_dev_irq(&vhub->ports[1].dev); + if (istat & VHUB_IRQ_DEVICE3) + ast_vhub_dev_irq(&vhub->ports[2].dev); + if (istat & VHUB_IRQ_DEVICE4) + ast_vhub_dev_irq(&vhub->ports[3].dev); + if (istat & VHUB_IRQ_DEVICE5) + ast_vhub_dev_irq(&vhub->ports[4].dev); + } + + /* Handle top-level vHub EP0 interrupts */ + if (istat & (VHUB_IRQ_HUB_EP0_OUT_ACK_STALL | + VHUB_IRQ_HUB_EP0_IN_ACK_STALL | + VHUB_IRQ_HUB_EP0_SETUP)) { + if (istat & VHUB_IRQ_HUB_EP0_IN_ACK_STALL) + ast_vhub_ep0_handle_ack(&vhub->ep0, true); + if (istat & VHUB_IRQ_HUB_EP0_OUT_ACK_STALL) + ast_vhub_ep0_handle_ack(&vhub->ep0, false); + if (istat & VHUB_IRQ_HUB_EP0_SETUP) + ast_vhub_ep0_handle_setup(&vhub->ep0); + } + + /* Various top level bus events */ + if (istat & (VHUB_IRQ_BUS_RESUME | + VHUB_IRQ_BUS_SUSPEND | + VHUB_IRQ_BUS_RESET)) { + if (istat & VHUB_IRQ_BUS_RESUME) + ast_vhub_hub_resume(vhub); + if (istat & VHUB_IRQ_BUS_SUSPEND) + ast_vhub_hub_suspend(vhub); + if (istat & VHUB_IRQ_BUS_RESET) + ast_vhub_hub_reset(vhub); + } + + bail: + spin_unlock(&vhub->lock); + return iret; +} + +void ast_vhub_init_hw(struct ast_vhub *vhub) +{ + u32 ctrl; + + UDCDBG(vhub,"(Re)Starting HW ...\n"); + + /* Enable PHY */ + ctrl = VHUB_CTRL_PHY_CLK | + VHUB_CTRL_PHY_RESET_DIS; + + /* + * We do *NOT* set the VHUB_CTRL_CLK_STOP_SUSPEND bit + * to stop the logic clock during suspend because + * it causes the registers to become inaccessible and + * we haven't yet figured out a good wayt to bring the + * controller back into life to issue a wakeup. + */ + + /* + * Set some ISO & split control bits according to Aspeed + * recommendation + * + * VHUB_CTRL_ISO_RSP_CTRL: When set tells the HW to respond + * with 0 bytes data packet to ISO IN endpoints when no data + * is available. + * + * VHUB_CTRL_SPLIT_IN: This makes a SOF complete a split IN + * transaction. + */ + ctrl |= VHUB_CTRL_ISO_RSP_CTRL | VHUB_CTRL_SPLIT_IN; + writel(ctrl, vhub->regs + AST_VHUB_CTRL); + udelay(1); + + /* Set descriptor ring size */ + if (AST_VHUB_DESCS_COUNT == 256) { + ctrl |= VHUB_CTRL_LONG_DESC; + writel(ctrl, vhub->regs + AST_VHUB_CTRL); + } else { + BUILD_BUG_ON(AST_VHUB_DESCS_COUNT != 32); + } + + /* Reset all devices */ + writel(VHUB_SW_RESET_ALL, vhub->regs + AST_VHUB_SW_RESET); + udelay(1); + writel(0, vhub->regs + AST_VHUB_SW_RESET); + + /* Disable and cleanup EP ACK/NACK interrupts */ + writel(0, vhub->regs + AST_VHUB_EP_ACK_IER); + writel(0, vhub->regs + AST_VHUB_EP_NACK_IER); + writel(VHUB_EP_IRQ_ALL, vhub->regs + AST_VHUB_EP_ACK_ISR); + writel(VHUB_EP_IRQ_ALL, vhub->regs + AST_VHUB_EP_NACK_ISR); + + /* Default settings for EP0, enable HW hub EP1 */ + writel(0, vhub->regs + AST_VHUB_EP0_CTRL); + writel(VHUB_EP1_CTRL_RESET_TOGGLE | + VHUB_EP1_CTRL_ENABLE, + vhub->regs + AST_VHUB_EP1_CTRL); + writel(0, vhub->regs + AST_VHUB_EP1_STS_CHG); + + /* Configure EP0 DMA buffer */ + writel(vhub->ep0.buf_dma, vhub->regs + AST_VHUB_EP0_DATA); + + /* Clear address */ + writel(0, vhub->regs + AST_VHUB_CONF); + + /* Pullup hub (activate on host) */ + if (vhub->force_usb1) + ctrl |= VHUB_CTRL_FULL_SPEED_ONLY; + + ctrl |= VHUB_CTRL_UPSTREAM_CONNECT; + writel(ctrl, vhub->regs + AST_VHUB_CTRL); + + /* Enable some interrupts */ + writel(VHUB_IRQ_HUB_EP0_IN_ACK_STALL | + VHUB_IRQ_HUB_EP0_OUT_ACK_STALL | + VHUB_IRQ_HUB_EP0_SETUP | + VHUB_IRQ_EP_POOL_ACK_STALL | + VHUB_IRQ_BUS_RESUME | + VHUB_IRQ_BUS_SUSPEND | + VHUB_IRQ_BUS_RESET, + vhub->regs + AST_VHUB_IER); +} + +static int ast_vhub_remove(struct platform_device *pdev) +{ + struct ast_vhub *vhub = platform_get_drvdata(pdev); + unsigned long flags; + int i; + + if (!vhub || !vhub->regs) + return 0; + + /* Remove devices */ + for (i = 0; i < AST_VHUB_NUM_PORTS; i++) + ast_vhub_del_dev(&vhub->ports[i].dev); + + spin_lock_irqsave(&vhub->lock, flags); + + /* Mask & ack all interrupts */ + writel(0, vhub->regs + AST_VHUB_IER); + writel(VHUB_IRQ_ACK_ALL, vhub->regs + AST_VHUB_ISR); + + /* Pull device, leave PHY enabled */ + writel(VHUB_CTRL_PHY_CLK | + VHUB_CTRL_PHY_RESET_DIS, + vhub->regs + AST_VHUB_CTRL); + + if (vhub->clk) + clk_disable_unprepare(vhub->clk); + + spin_unlock_irqrestore(&vhub->lock, flags); + + if (vhub->ep0_bufs) + dma_free_coherent(&pdev->dev, + AST_VHUB_EP0_MAX_PACKET * + (AST_VHUB_NUM_PORTS + 1), + vhub->ep0_bufs, + vhub->ep0_bufs_dma); + vhub->ep0_bufs = NULL; + + return 0; +} + +static int ast_vhub_probe(struct platform_device *pdev) +{ + enum usb_device_speed max_speed; + struct ast_vhub *vhub; + struct resource *res; + int i, rc = 0; + + vhub = devm_kzalloc(&pdev->dev, sizeof(*vhub), GFP_KERNEL); + if (!vhub) + return -ENOMEM; + + spin_lock_init(&vhub->lock); + vhub->pdev = pdev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + vhub->regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(vhub->regs)) { + dev_err(&pdev->dev, "Failed to map resources\n"); + return PTR_ERR(vhub->regs); + } + UDCDBG(vhub, "vHub@%pR mapped @%p\n", res, vhub->regs); + + platform_set_drvdata(pdev, vhub); + + vhub->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(vhub->clk)) { + rc = PTR_ERR(vhub->clk); + goto err; + } + rc = clk_prepare_enable(vhub->clk); + if (rc) { + dev_err(&pdev->dev, "Error couldn't enable clock (%d)\n", rc); + goto err; + } + + /* Check if we need to limit the HW to USB1 */ + max_speed = usb_get_maximum_speed(&pdev->dev); + if (max_speed != USB_SPEED_UNKNOWN && max_speed < USB_SPEED_HIGH) + vhub->force_usb1 = true; + + /* Mask & ack all interrupts before installing the handler */ + writel(0, vhub->regs + AST_VHUB_IER); + writel(VHUB_IRQ_ACK_ALL, vhub->regs + AST_VHUB_ISR); + + /* Find interrupt and install handler */ + vhub->irq = platform_get_irq(pdev, 0); + if (vhub->irq < 0) { + dev_err(&pdev->dev, "Failed to get interrupt\n"); + rc = vhub->irq; + goto err; + } + rc = devm_request_irq(&pdev->dev, vhub->irq, ast_vhub_irq, 0, + KBUILD_MODNAME, vhub); + if (rc) { + dev_err(&pdev->dev, "Failed to request interrupt\n"); + goto err; + } + + /* + * Allocate DMA buffers for all EP0s in one chunk, + * one per port and one for the vHub itself + */ + vhub->ep0_bufs = dma_alloc_coherent(&pdev->dev, + AST_VHUB_EP0_MAX_PACKET * + (AST_VHUB_NUM_PORTS + 1), + &vhub->ep0_bufs_dma, GFP_KERNEL); + if (!vhub->ep0_bufs) { + dev_err(&pdev->dev, "Failed to allocate EP0 DMA buffers\n"); + rc = -ENOMEM; + goto err; + } + UDCVDBG(vhub, "EP0 DMA buffers @%p (DMA 0x%08x)\n", + vhub->ep0_bufs, (u32)vhub->ep0_bufs_dma); + + /* Init vHub EP0 */ + ast_vhub_init_ep0(vhub, &vhub->ep0, NULL); + + /* Init devices */ + for (i = 0; i < AST_VHUB_NUM_PORTS && rc == 0; i++) + rc = ast_vhub_init_dev(vhub, i); + if (rc) + goto err; + + /* Init hub emulation */ + ast_vhub_init_hub(vhub); + + /* Initialize HW */ + ast_vhub_init_hw(vhub); + + dev_info(&pdev->dev, "Initialized virtual hub in USB%d mode\n", + vhub->force_usb1 ? 1 : 2); + + return 0; + err: + ast_vhub_remove(pdev); + return rc; +} + +static const struct of_device_id ast_vhub_dt_ids[] = { + { + .compatible = "aspeed,ast2400-usb-vhub", + }, + { + .compatible = "aspeed,ast2500-usb-vhub", + }, + { } +}; +MODULE_DEVICE_TABLE(of, ast_vhub_dt_ids); + +static struct platform_driver ast_vhub_driver = { + .probe = ast_vhub_probe, + .remove = ast_vhub_remove, + .driver = { + .name = KBUILD_MODNAME, + .of_match_table = ast_vhub_dt_ids, + }, +}; +module_platform_driver(ast_vhub_driver); + +MODULE_DESCRIPTION("Aspeed vHub udc driver"); +MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/usb/gadget/udc/aspeed-vhub/dev.c b/drivers/usb/gadget/udc/aspeed-vhub/dev.c new file mode 100644 index 000000000..f0233912b --- /dev/null +++ b/drivers/usb/gadget/udc/aspeed-vhub/dev.c @@ -0,0 +1,589 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * aspeed-vhub -- Driver for Aspeed SoC "vHub" USB gadget + * + * dev.c - Individual device/gadget management (ie, a port = a gadget) + * + * Copyright 2017 IBM Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/delay.h> +#include <linux/ioport.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/list.h> +#include <linux/interrupt.h> +#include <linux/proc_fs.h> +#include <linux/prefetch.h> +#include <linux/clk.h> +#include <linux/usb/gadget.h> +#include <linux/of.h> +#include <linux/of_gpio.h> +#include <linux/regmap.h> +#include <linux/dma-mapping.h> +#include <linux/usb.h> +#include <linux/usb/hcd.h> + +#include "vhub.h" + +void ast_vhub_dev_irq(struct ast_vhub_dev *d) +{ + u32 istat = readl(d->regs + AST_VHUB_DEV_ISR); + + writel(istat, d->regs + AST_VHUB_DEV_ISR); + + if (istat & VHUV_DEV_IRQ_EP0_IN_ACK_STALL) + ast_vhub_ep0_handle_ack(&d->ep0, true); + if (istat & VHUV_DEV_IRQ_EP0_OUT_ACK_STALL) + ast_vhub_ep0_handle_ack(&d->ep0, false); + if (istat & VHUV_DEV_IRQ_EP0_SETUP) + ast_vhub_ep0_handle_setup(&d->ep0); +} + +static void ast_vhub_dev_enable(struct ast_vhub_dev *d) +{ + u32 reg, hmsk; + + if (d->enabled) + return; + + /* Enable device and its EP0 interrupts */ + reg = VHUB_DEV_EN_ENABLE_PORT | + VHUB_DEV_EN_EP0_IN_ACK_IRQEN | + VHUB_DEV_EN_EP0_OUT_ACK_IRQEN | + VHUB_DEV_EN_EP0_SETUP_IRQEN; + if (d->gadget.speed == USB_SPEED_HIGH) + reg |= VHUB_DEV_EN_SPEED_SEL_HIGH; + writel(reg, d->regs + AST_VHUB_DEV_EN_CTRL); + + /* Enable device interrupt in the hub as well */ + hmsk = VHUB_IRQ_DEVICE1 << d->index; + reg = readl(d->vhub->regs + AST_VHUB_IER); + reg |= hmsk; + writel(reg, d->vhub->regs + AST_VHUB_IER); + + /* Set EP0 DMA buffer address */ + writel(d->ep0.buf_dma, d->regs + AST_VHUB_DEV_EP0_DATA); + + d->enabled = true; +} + +static void ast_vhub_dev_disable(struct ast_vhub_dev *d) +{ + u32 reg, hmsk; + + if (!d->enabled) + return; + + /* Disable device interrupt in the hub */ + hmsk = VHUB_IRQ_DEVICE1 << d->index; + reg = readl(d->vhub->regs + AST_VHUB_IER); + reg &= ~hmsk; + writel(reg, d->vhub->regs + AST_VHUB_IER); + + /* Then disable device */ + writel(0, d->regs + AST_VHUB_DEV_EN_CTRL); + d->gadget.speed = USB_SPEED_UNKNOWN; + d->enabled = false; + d->suspended = false; +} + +static int ast_vhub_dev_feature(struct ast_vhub_dev *d, + u16 wIndex, u16 wValue, + bool is_set) +{ + DDBG(d, "%s_FEATURE(dev val=%02x)\n", + is_set ? "SET" : "CLEAR", wValue); + + if (wValue != USB_DEVICE_REMOTE_WAKEUP) + return std_req_driver; + + d->wakeup_en = is_set; + + return std_req_complete; +} + +static int ast_vhub_ep_feature(struct ast_vhub_dev *d, + u16 wIndex, u16 wValue, bool is_set) +{ + struct ast_vhub_ep *ep; + int ep_num; + + ep_num = wIndex & USB_ENDPOINT_NUMBER_MASK; + DDBG(d, "%s_FEATURE(ep%d val=%02x)\n", + is_set ? "SET" : "CLEAR", ep_num, wValue); + if (ep_num == 0) + return std_req_complete; + if (ep_num >= AST_VHUB_NUM_GEN_EPs || !d->epns[ep_num - 1]) + return std_req_stall; + if (wValue != USB_ENDPOINT_HALT) + return std_req_driver; + + ep = d->epns[ep_num - 1]; + if (WARN_ON(!ep)) + return std_req_stall; + + if (!ep->epn.enabled || !ep->ep.desc || ep->epn.is_iso || + ep->epn.is_in != !!(wIndex & USB_DIR_IN)) + return std_req_stall; + + DDBG(d, "%s stall on EP %d\n", + is_set ? "setting" : "clearing", ep_num); + ep->epn.stalled = is_set; + ast_vhub_update_epn_stall(ep); + + return std_req_complete; +} + +static int ast_vhub_dev_status(struct ast_vhub_dev *d, + u16 wIndex, u16 wValue) +{ + u8 st0; + + DDBG(d, "GET_STATUS(dev)\n"); + + st0 = d->gadget.is_selfpowered << USB_DEVICE_SELF_POWERED; + if (d->wakeup_en) + st0 |= 1 << USB_DEVICE_REMOTE_WAKEUP; + + return ast_vhub_simple_reply(&d->ep0, st0, 0); +} + +static int ast_vhub_ep_status(struct ast_vhub_dev *d, + u16 wIndex, u16 wValue) +{ + int ep_num = wIndex & USB_ENDPOINT_NUMBER_MASK; + struct ast_vhub_ep *ep; + u8 st0 = 0; + + DDBG(d, "GET_STATUS(ep%d)\n", ep_num); + + if (ep_num >= AST_VHUB_NUM_GEN_EPs) + return std_req_stall; + if (ep_num != 0) { + ep = d->epns[ep_num - 1]; + if (!ep) + return std_req_stall; + if (!ep->epn.enabled || !ep->ep.desc || ep->epn.is_iso || + ep->epn.is_in != !!(wIndex & USB_DIR_IN)) + return std_req_stall; + if (ep->epn.stalled) + st0 |= 1 << USB_ENDPOINT_HALT; + } + + return ast_vhub_simple_reply(&d->ep0, st0, 0); +} + +static void ast_vhub_dev_set_address(struct ast_vhub_dev *d, u8 addr) +{ + u32 reg; + + DDBG(d, "SET_ADDRESS: Got address %x\n", addr); + + reg = readl(d->regs + AST_VHUB_DEV_EN_CTRL); + reg &= ~VHUB_DEV_EN_ADDR_MASK; + reg |= VHUB_DEV_EN_SET_ADDR(addr); + writel(reg, d->regs + AST_VHUB_DEV_EN_CTRL); +} + +int ast_vhub_std_dev_request(struct ast_vhub_ep *ep, + struct usb_ctrlrequest *crq) +{ + struct ast_vhub_dev *d = ep->dev; + u16 wValue, wIndex; + + /* No driver, we shouldn't be enabled ... */ + if (!d->driver || !d->enabled || d->suspended) { + EPDBG(ep, + "Device is wrong state driver=%p enabled=%d" + " suspended=%d\n", + d->driver, d->enabled, d->suspended); + return std_req_stall; + } + + /* First packet, grab speed */ + if (d->gadget.speed == USB_SPEED_UNKNOWN) { + d->gadget.speed = ep->vhub->speed; + if (d->gadget.speed > d->driver->max_speed) + d->gadget.speed = d->driver->max_speed; + DDBG(d, "fist packet, captured speed %d\n", + d->gadget.speed); + } + + wValue = le16_to_cpu(crq->wValue); + wIndex = le16_to_cpu(crq->wIndex); + + switch ((crq->bRequestType << 8) | crq->bRequest) { + /* SET_ADDRESS */ + case DeviceOutRequest | USB_REQ_SET_ADDRESS: + ast_vhub_dev_set_address(d, wValue); + return std_req_complete; + + /* GET_STATUS */ + case DeviceRequest | USB_REQ_GET_STATUS: + return ast_vhub_dev_status(d, wIndex, wValue); + case InterfaceRequest | USB_REQ_GET_STATUS: + return ast_vhub_simple_reply(ep, 0, 0); + case EndpointRequest | USB_REQ_GET_STATUS: + return ast_vhub_ep_status(d, wIndex, wValue); + + /* SET/CLEAR_FEATURE */ + case DeviceOutRequest | USB_REQ_SET_FEATURE: + return ast_vhub_dev_feature(d, wIndex, wValue, true); + case DeviceOutRequest | USB_REQ_CLEAR_FEATURE: + return ast_vhub_dev_feature(d, wIndex, wValue, false); + case EndpointOutRequest | USB_REQ_SET_FEATURE: + return ast_vhub_ep_feature(d, wIndex, wValue, true); + case EndpointOutRequest | USB_REQ_CLEAR_FEATURE: + return ast_vhub_ep_feature(d, wIndex, wValue, false); + } + return std_req_driver; +} + +static int ast_vhub_udc_wakeup(struct usb_gadget* gadget) +{ + struct ast_vhub_dev *d = to_ast_dev(gadget); + unsigned long flags; + int rc = -EINVAL; + + spin_lock_irqsave(&d->vhub->lock, flags); + if (!d->wakeup_en) + goto err; + + DDBG(d, "Device initiated wakeup\n"); + + /* Wakeup the host */ + ast_vhub_hub_wake_all(d->vhub); + rc = 0; + err: + spin_unlock_irqrestore(&d->vhub->lock, flags); + return rc; +} + +static int ast_vhub_udc_get_frame(struct usb_gadget* gadget) +{ + struct ast_vhub_dev *d = to_ast_dev(gadget); + + return (readl(d->vhub->regs + AST_VHUB_USBSTS) >> 16) & 0x7ff; +} + +static void ast_vhub_dev_nuke(struct ast_vhub_dev *d) +{ + unsigned int i; + + for (i = 0; i < AST_VHUB_NUM_GEN_EPs; i++) { + if (!d->epns[i]) + continue; + ast_vhub_nuke(d->epns[i], -ESHUTDOWN); + } +} + +static int ast_vhub_udc_pullup(struct usb_gadget* gadget, int on) +{ + struct ast_vhub_dev *d = to_ast_dev(gadget); + unsigned long flags; + + spin_lock_irqsave(&d->vhub->lock, flags); + + DDBG(d, "pullup(%d)\n", on); + + /* Mark disconnected in the hub */ + ast_vhub_device_connect(d->vhub, d->index, on); + + /* + * If enabled, nuke all requests if any (there shouldn't be) + * and disable the port. This will clear the address too. + */ + if (d->enabled) { + ast_vhub_dev_nuke(d); + ast_vhub_dev_disable(d); + } + + spin_unlock_irqrestore(&d->vhub->lock, flags); + + return 0; +} + +static int ast_vhub_udc_start(struct usb_gadget *gadget, + struct usb_gadget_driver *driver) +{ + struct ast_vhub_dev *d = to_ast_dev(gadget); + unsigned long flags; + + spin_lock_irqsave(&d->vhub->lock, flags); + + DDBG(d, "start\n"); + + /* We don't do much more until the hub enables us */ + d->driver = driver; + d->gadget.is_selfpowered = 1; + + spin_unlock_irqrestore(&d->vhub->lock, flags); + + return 0; +} + +static struct usb_ep *ast_vhub_udc_match_ep(struct usb_gadget *gadget, + struct usb_endpoint_descriptor *desc, + struct usb_ss_ep_comp_descriptor *ss) +{ + struct ast_vhub_dev *d = to_ast_dev(gadget); + struct ast_vhub_ep *ep; + struct usb_ep *u_ep; + unsigned int max, addr, i; + + DDBG(d, "Match EP type %d\n", usb_endpoint_type(desc)); + + /* + * First we need to look for an existing unclaimed EP as another + * configuration may have already associated a bunch of EPs with + * this gadget. This duplicates the code in usb_ep_autoconfig_ss() + * unfortunately. + */ + list_for_each_entry(u_ep, &gadget->ep_list, ep_list) { + if (usb_gadget_ep_match_desc(gadget, u_ep, desc, ss)) { + DDBG(d, " -> using existing EP%d\n", + to_ast_ep(u_ep)->d_idx); + return u_ep; + } + } + + /* + * We didn't find one, we need to grab one from the pool. + * + * First let's do some sanity checking + */ + switch(usb_endpoint_type(desc)) { + case USB_ENDPOINT_XFER_CONTROL: + /* Only EP0 can be a control endpoint */ + return NULL; + case USB_ENDPOINT_XFER_ISOC: + /* ISO: limit 1023 bytes full speed, 1024 high/super speed */ + if (gadget_is_dualspeed(gadget)) + max = 1024; + else + max = 1023; + break; + case USB_ENDPOINT_XFER_BULK: + if (gadget_is_dualspeed(gadget)) + max = 512; + else + max = 64; + break; + case USB_ENDPOINT_XFER_INT: + if (gadget_is_dualspeed(gadget)) + max = 1024; + else + max = 64; + break; + } + if (usb_endpoint_maxp(desc) > max) + return NULL; + + /* + * Find a free EP address for that device. We can't + * let the generic code assign these as it would + * create overlapping numbers for IN and OUT which + * we don't support, so also create a suitable name + * that will allow the generic code to use our + * assigned address. + */ + for (i = 0; i < AST_VHUB_NUM_GEN_EPs; i++) + if (d->epns[i] == NULL) + break; + if (i >= AST_VHUB_NUM_GEN_EPs) + return NULL; + addr = i + 1; + + /* + * Now grab an EP from the shared pool and associate + * it with our device + */ + ep = ast_vhub_alloc_epn(d, addr); + if (!ep) + return NULL; + DDBG(d, "Allocated epn#%d for port EP%d\n", + ep->epn.g_idx, addr); + + return &ep->ep; +} + +static int ast_vhub_udc_stop(struct usb_gadget *gadget) +{ + struct ast_vhub_dev *d = to_ast_dev(gadget); + unsigned long flags; + + spin_lock_irqsave(&d->vhub->lock, flags); + + DDBG(d, "stop\n"); + + d->driver = NULL; + d->gadget.speed = USB_SPEED_UNKNOWN; + + ast_vhub_dev_nuke(d); + + if (d->enabled) + ast_vhub_dev_disable(d); + + spin_unlock_irqrestore(&d->vhub->lock, flags); + + return 0; +} + +static struct usb_gadget_ops ast_vhub_udc_ops = { + .get_frame = ast_vhub_udc_get_frame, + .wakeup = ast_vhub_udc_wakeup, + .pullup = ast_vhub_udc_pullup, + .udc_start = ast_vhub_udc_start, + .udc_stop = ast_vhub_udc_stop, + .match_ep = ast_vhub_udc_match_ep, +}; + +void ast_vhub_dev_suspend(struct ast_vhub_dev *d) +{ + d->suspended = true; + if (d->driver) { + spin_unlock(&d->vhub->lock); + d->driver->suspend(&d->gadget); + spin_lock(&d->vhub->lock); + } +} + +void ast_vhub_dev_resume(struct ast_vhub_dev *d) +{ + d->suspended = false; + if (d->driver) { + spin_unlock(&d->vhub->lock); + d->driver->resume(&d->gadget); + spin_lock(&d->vhub->lock); + } +} + +void ast_vhub_dev_reset(struct ast_vhub_dev *d) +{ + /* + * If speed is not set, we enable the port. If it is, + * send reset to the gadget and reset "speed". + * + * Speed is an indication that we have got the first + * setup packet to the device. + */ + if (d->gadget.speed == USB_SPEED_UNKNOWN && !d->enabled) { + DDBG(d, "Reset at unknown speed of disabled device, enabling...\n"); + ast_vhub_dev_enable(d); + d->suspended = false; + } + if (d->gadget.speed != USB_SPEED_UNKNOWN && d->driver) { + unsigned int i; + + DDBG(d, "Reset at known speed of bound device, resetting...\n"); + spin_unlock(&d->vhub->lock); + d->driver->reset(&d->gadget); + spin_lock(&d->vhub->lock); + + /* + * Disable/re-enable HW, this will clear the address + * and speed setting. + */ + ast_vhub_dev_disable(d); + ast_vhub_dev_enable(d); + + /* Clear stall on all EPs */ + for (i = 0; i < AST_VHUB_NUM_GEN_EPs; i++) { + struct ast_vhub_ep *ep = d->epns[i]; + + if (ep && ep->epn.stalled) { + ep->epn.stalled = false; + ast_vhub_update_epn_stall(ep); + } + } + + /* Additional cleanups */ + d->wakeup_en = false; + d->suspended = false; + } +} + +void ast_vhub_del_dev(struct ast_vhub_dev *d) +{ + unsigned long flags; + + spin_lock_irqsave(&d->vhub->lock, flags); + if (!d->registered) { + spin_unlock_irqrestore(&d->vhub->lock, flags); + return; + } + d->registered = false; + spin_unlock_irqrestore(&d->vhub->lock, flags); + + usb_del_gadget_udc(&d->gadget); + device_unregister(d->port_dev); +} + +static void ast_vhub_dev_release(struct device *dev) +{ + kfree(dev); +} + +int ast_vhub_init_dev(struct ast_vhub *vhub, unsigned int idx) +{ + struct ast_vhub_dev *d = &vhub->ports[idx].dev; + struct device *parent = &vhub->pdev->dev; + int rc; + + d->vhub = vhub; + d->index = idx; + d->name = devm_kasprintf(parent, GFP_KERNEL, "port%d", idx+1); + d->regs = vhub->regs + 0x100 + 0x10 * idx; + + ast_vhub_init_ep0(vhub, &d->ep0, d); + + /* + * The UDC core really needs us to have separate and uniquely + * named "parent" devices for each port so we create a sub device + * here for that purpose + */ + d->port_dev = kzalloc(sizeof(struct device), GFP_KERNEL); + if (!d->port_dev) + return -ENOMEM; + device_initialize(d->port_dev); + d->port_dev->release = ast_vhub_dev_release; + d->port_dev->parent = parent; + dev_set_name(d->port_dev, "%s:p%d", dev_name(parent), idx + 1); + rc = device_add(d->port_dev); + if (rc) + goto fail_add; + + /* Populate gadget */ + INIT_LIST_HEAD(&d->gadget.ep_list); + d->gadget.ops = &ast_vhub_udc_ops; + d->gadget.ep0 = &d->ep0.ep; + d->gadget.name = KBUILD_MODNAME; + if (vhub->force_usb1) + d->gadget.max_speed = USB_SPEED_FULL; + else + d->gadget.max_speed = USB_SPEED_HIGH; + d->gadget.speed = USB_SPEED_UNKNOWN; + d->gadget.dev.of_node = vhub->pdev->dev.of_node; + + rc = usb_add_gadget_udc(d->port_dev, &d->gadget); + if (rc != 0) + goto fail_udc; + d->registered = true; + + return 0; + fail_udc: + device_del(d->port_dev); + fail_add: + put_device(d->port_dev); + + return rc; +} diff --git a/drivers/usb/gadget/udc/aspeed-vhub/ep0.c b/drivers/usb/gadget/udc/aspeed-vhub/ep0.c new file mode 100644 index 000000000..e2927fb08 --- /dev/null +++ b/drivers/usb/gadget/udc/aspeed-vhub/ep0.c @@ -0,0 +1,495 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * aspeed-vhub -- Driver for Aspeed SoC "vHub" USB gadget + * + * ep0.c - Endpoint 0 handling + * + * Copyright 2017 IBM Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/delay.h> +#include <linux/ioport.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/list.h> +#include <linux/interrupt.h> +#include <linux/proc_fs.h> +#include <linux/prefetch.h> +#include <linux/clk.h> +#include <linux/usb/gadget.h> +#include <linux/of.h> +#include <linux/of_gpio.h> +#include <linux/regmap.h> +#include <linux/dma-mapping.h> + +#include "vhub.h" + +int ast_vhub_reply(struct ast_vhub_ep *ep, char *ptr, int len) +{ + struct usb_request *req = &ep->ep0.req.req; + int rc; + + if (WARN_ON(ep->d_idx != 0)) + return std_req_stall; + if (WARN_ON(!ep->ep0.dir_in)) + return std_req_stall; + if (WARN_ON(len > AST_VHUB_EP0_MAX_PACKET)) + return std_req_stall; + if (WARN_ON(req->status == -EINPROGRESS)) + return std_req_stall; + + req->buf = ptr; + req->length = len; + req->complete = NULL; + req->zero = true; + + /* + * Call internal queue directly after dropping the lock. This is + * safe to do as the reply is always the last thing done when + * processing a SETUP packet, usually as a tail call + */ + spin_unlock(&ep->vhub->lock); + if (ep->ep.ops->queue(&ep->ep, req, GFP_ATOMIC)) + rc = std_req_stall; + else + rc = std_req_data; + spin_lock(&ep->vhub->lock); + return rc; +} + +int __ast_vhub_simple_reply(struct ast_vhub_ep *ep, int len, ...) +{ + u8 *buffer = ep->buf; + unsigned int i; + va_list args; + + va_start(args, len); + + /* Copy data directly into EP buffer */ + for (i = 0; i < len; i++) + buffer[i] = va_arg(args, int); + va_end(args); + + /* req->buf NULL means data is already there */ + return ast_vhub_reply(ep, NULL, len); +} + +void ast_vhub_ep0_handle_setup(struct ast_vhub_ep *ep) +{ + struct usb_ctrlrequest crq; + enum std_req_rc std_req_rc; + int rc = -ENODEV; + + if (WARN_ON(ep->d_idx != 0)) + return; + + /* + * Grab the setup packet from the chip and byteswap + * interesting fields + */ + memcpy_fromio(&crq, ep->ep0.setup, sizeof(crq)); + + EPDBG(ep, "SETUP packet %02x/%02x/%04x/%04x/%04x [%s] st=%d\n", + crq.bRequestType, crq.bRequest, + le16_to_cpu(crq.wValue), + le16_to_cpu(crq.wIndex), + le16_to_cpu(crq.wLength), + (crq.bRequestType & USB_DIR_IN) ? "in" : "out", + ep->ep0.state); + + /* Check our state, cancel pending requests if needed */ + if (ep->ep0.state != ep0_state_token) { + EPDBG(ep, "wrong state\n"); + ast_vhub_nuke(ep, -EIO); + + /* + * Accept the packet regardless, this seems to happen + * when stalling a SETUP packet that has an OUT data + * phase. + */ + ast_vhub_nuke(ep, 0); + goto stall; + } + + /* Calculate next state for EP0 */ + ep->ep0.state = ep0_state_data; + ep->ep0.dir_in = !!(crq.bRequestType & USB_DIR_IN); + + /* If this is the vHub, we handle requests differently */ + std_req_rc = std_req_driver; + if (ep->dev == NULL) { + if ((crq.bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) + std_req_rc = ast_vhub_std_hub_request(ep, &crq); + else if ((crq.bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) + std_req_rc = ast_vhub_class_hub_request(ep, &crq); + else + std_req_rc = std_req_stall; + } else if ((crq.bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) + std_req_rc = ast_vhub_std_dev_request(ep, &crq); + + /* Act upon result */ + switch(std_req_rc) { + case std_req_complete: + goto complete; + case std_req_stall: + goto stall; + case std_req_driver: + break; + case std_req_data: + return; + } + + /* Pass request up to the gadget driver */ + if (WARN_ON(!ep->dev)) + goto stall; + if (ep->dev->driver) { + EPDBG(ep, "forwarding to gadget...\n"); + spin_unlock(&ep->vhub->lock); + rc = ep->dev->driver->setup(&ep->dev->gadget, &crq); + spin_lock(&ep->vhub->lock); + EPDBG(ep, "driver returned %d\n", rc); + } else { + EPDBG(ep, "no gadget for request !\n"); + } + if (rc >= 0) + return; + + stall: + EPDBG(ep, "stalling\n"); + writel(VHUB_EP0_CTRL_STALL, ep->ep0.ctlstat); + ep->ep0.state = ep0_state_status; + ep->ep0.dir_in = false; + return; + + complete: + EPVDBG(ep, "sending [in] status with no data\n"); + writel(VHUB_EP0_TX_BUFF_RDY, ep->ep0.ctlstat); + ep->ep0.state = ep0_state_status; + ep->ep0.dir_in = false; +} + + +static void ast_vhub_ep0_do_send(struct ast_vhub_ep *ep, + struct ast_vhub_req *req) +{ + unsigned int chunk; + u32 reg; + + /* If this is a 0-length request, it's the gadget trying to + * send a status on our behalf. We take it from here. + */ + if (req->req.length == 0) + req->last_desc = 1; + + /* Are we done ? Complete request, otherwise wait for next interrupt */ + if (req->last_desc >= 0) { + EPVDBG(ep, "complete send %d/%d\n", + req->req.actual, req->req.length); + ep->ep0.state = ep0_state_status; + writel(VHUB_EP0_RX_BUFF_RDY, ep->ep0.ctlstat); + ast_vhub_done(ep, req, 0); + return; + } + + /* + * Next chunk cropped to max packet size. Also check if this + * is the last packet + */ + chunk = req->req.length - req->req.actual; + if (chunk > ep->ep.maxpacket) + chunk = ep->ep.maxpacket; + else if ((chunk < ep->ep.maxpacket) || !req->req.zero) + req->last_desc = 1; + + EPVDBG(ep, "send chunk=%d last=%d, req->act=%d mp=%d\n", + chunk, req->last_desc, req->req.actual, ep->ep.maxpacket); + + /* + * Copy data if any (internal requests already have data + * in the EP buffer) + */ + if (chunk && req->req.buf) + memcpy(ep->buf, req->req.buf + req->req.actual, chunk); + + vhub_dma_workaround(ep->buf); + + /* Remember chunk size and trigger send */ + reg = VHUB_EP0_SET_TX_LEN(chunk); + writel(reg, ep->ep0.ctlstat); + writel(reg | VHUB_EP0_TX_BUFF_RDY, ep->ep0.ctlstat); + req->req.actual += chunk; +} + +static void ast_vhub_ep0_rx_prime(struct ast_vhub_ep *ep) +{ + EPVDBG(ep, "rx prime\n"); + + /* Prime endpoint for receiving data */ + writel(VHUB_EP0_RX_BUFF_RDY, ep->ep0.ctlstat); +} + +static void ast_vhub_ep0_do_receive(struct ast_vhub_ep *ep, struct ast_vhub_req *req, + unsigned int len) +{ + unsigned int remain; + int rc = 0; + + /* We are receiving... grab request */ + remain = req->req.length - req->req.actual; + + EPVDBG(ep, "receive got=%d remain=%d\n", len, remain); + + /* Are we getting more than asked ? */ + if (len > remain) { + EPDBG(ep, "receiving too much (ovf: %d) !\n", + len - remain); + len = remain; + rc = -EOVERFLOW; + } + if (len && req->req.buf) + memcpy(req->req.buf + req->req.actual, ep->buf, len); + req->req.actual += len; + + /* Done ? */ + if (len < ep->ep.maxpacket || len == remain) { + ep->ep0.state = ep0_state_status; + writel(VHUB_EP0_TX_BUFF_RDY, ep->ep0.ctlstat); + ast_vhub_done(ep, req, rc); + } else + ast_vhub_ep0_rx_prime(ep); +} + +void ast_vhub_ep0_handle_ack(struct ast_vhub_ep *ep, bool in_ack) +{ + struct ast_vhub_req *req; + struct ast_vhub *vhub = ep->vhub; + struct device *dev = &vhub->pdev->dev; + bool stall = false; + u32 stat; + + /* Read EP0 status */ + stat = readl(ep->ep0.ctlstat); + + /* Grab current request if any */ + req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req, queue); + + EPVDBG(ep, "ACK status=%08x,state=%d is_in=%d in_ack=%d req=%p\n", + stat, ep->ep0.state, ep->ep0.dir_in, in_ack, req); + + switch(ep->ep0.state) { + case ep0_state_token: + /* There should be no request queued in that state... */ + if (req) { + dev_warn(dev, "request present while in TOKEN state\n"); + ast_vhub_nuke(ep, -EINVAL); + } + dev_warn(dev, "ack while in TOKEN state\n"); + stall = true; + break; + case ep0_state_data: + /* Check the state bits corresponding to our direction */ + if ((ep->ep0.dir_in && (stat & VHUB_EP0_TX_BUFF_RDY)) || + (!ep->ep0.dir_in && (stat & VHUB_EP0_RX_BUFF_RDY)) || + (ep->ep0.dir_in != in_ack)) { + dev_warn(dev, "irq state mismatch"); + stall = true; + break; + } + /* + * We are in data phase and there's no request, something is + * wrong, stall + */ + if (!req) { + dev_warn(dev, "data phase, no request\n"); + stall = true; + break; + } + + /* We have a request, handle data transfers */ + if (ep->ep0.dir_in) + ast_vhub_ep0_do_send(ep, req); + else + ast_vhub_ep0_do_receive(ep, req, VHUB_EP0_RX_LEN(stat)); + return; + case ep0_state_status: + /* Nuke stale requests */ + if (req) { + dev_warn(dev, "request present while in STATUS state\n"); + ast_vhub_nuke(ep, -EINVAL); + } + + /* + * If the status phase completes with the wrong ack, stall + * the endpoint just in case, to abort whatever the host + * was doing. + */ + if (ep->ep0.dir_in == in_ack) { + dev_warn(dev, "status direction mismatch\n"); + stall = true; + } + } + + /* Reset to token state */ + ep->ep0.state = ep0_state_token; + if (stall) + writel(VHUB_EP0_CTRL_STALL, ep->ep0.ctlstat); +} + +static int ast_vhub_ep0_queue(struct usb_ep* u_ep, struct usb_request *u_req, + gfp_t gfp_flags) +{ + struct ast_vhub_req *req = to_ast_req(u_req); + struct ast_vhub_ep *ep = to_ast_ep(u_ep); + struct ast_vhub *vhub = ep->vhub; + struct device *dev = &vhub->pdev->dev; + unsigned long flags; + + /* Paranoid cheks */ + if (!u_req || (!u_req->complete && !req->internal)) { + dev_warn(dev, "Bogus EP0 request ! u_req=%p\n", u_req); + if (u_req) { + dev_warn(dev, "complete=%p internal=%d\n", + u_req->complete, req->internal); + } + return -EINVAL; + } + + /* Not endpoint 0 ? */ + if (WARN_ON(ep->d_idx != 0)) + return -EINVAL; + + /* Disabled device */ + if (ep->dev && (!ep->dev->enabled || ep->dev->suspended)) + return -ESHUTDOWN; + + /* Data, no buffer and not internal ? */ + if (u_req->length && !u_req->buf && !req->internal) { + dev_warn(dev, "Request with no buffer !\n"); + return -EINVAL; + } + + EPVDBG(ep, "enqueue req @%p\n", req); + EPVDBG(ep, " l=%d zero=%d noshort=%d is_in=%d\n", + u_req->length, u_req->zero, + u_req->short_not_ok, ep->ep0.dir_in); + + /* Initialize request progress fields */ + u_req->status = -EINPROGRESS; + u_req->actual = 0; + req->last_desc = -1; + req->active = false; + + spin_lock_irqsave(&vhub->lock, flags); + + /* EP0 can only support a single request at a time */ + if (!list_empty(&ep->queue) || ep->ep0.state == ep0_state_token) { + dev_warn(dev, "EP0: Request in wrong state\n"); + spin_unlock_irqrestore(&vhub->lock, flags); + return -EBUSY; + } + + /* Add request to list and kick processing if empty */ + list_add_tail(&req->queue, &ep->queue); + + if (ep->ep0.dir_in) { + /* IN request, send data */ + ast_vhub_ep0_do_send(ep, req); + } else if (u_req->length == 0) { + /* 0-len request, send completion as rx */ + EPVDBG(ep, "0-length rx completion\n"); + ep->ep0.state = ep0_state_status; + writel(VHUB_EP0_TX_BUFF_RDY, ep->ep0.ctlstat); + ast_vhub_done(ep, req, 0); + } else { + /* OUT request, start receiver */ + ast_vhub_ep0_rx_prime(ep); + } + + spin_unlock_irqrestore(&vhub->lock, flags); + + return 0; +} + +static int ast_vhub_ep0_dequeue(struct usb_ep* u_ep, struct usb_request *u_req) +{ + struct ast_vhub_ep *ep = to_ast_ep(u_ep); + struct ast_vhub *vhub = ep->vhub; + struct ast_vhub_req *req; + unsigned long flags; + int rc = -EINVAL; + + spin_lock_irqsave(&vhub->lock, flags); + + /* Only one request can be in the queue */ + req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req, queue); + + /* Is it ours ? */ + if (req && u_req == &req->req) { + EPVDBG(ep, "dequeue req @%p\n", req); + + /* + * We don't have to deal with "active" as all + * DMAs go to the EP buffers, not the request. + */ + ast_vhub_done(ep, req, -ECONNRESET); + + /* We do stall the EP to clean things up in HW */ + writel(VHUB_EP0_CTRL_STALL, ep->ep0.ctlstat); + ep->ep0.state = ep0_state_status; + ep->ep0.dir_in = false; + rc = 0; + } + spin_unlock_irqrestore(&vhub->lock, flags); + return rc; +} + + +static const struct usb_ep_ops ast_vhub_ep0_ops = { + .queue = ast_vhub_ep0_queue, + .dequeue = ast_vhub_ep0_dequeue, + .alloc_request = ast_vhub_alloc_request, + .free_request = ast_vhub_free_request, +}; + +void ast_vhub_init_ep0(struct ast_vhub *vhub, struct ast_vhub_ep *ep, + struct ast_vhub_dev *dev) +{ + memset(ep, 0, sizeof(*ep)); + + INIT_LIST_HEAD(&ep->ep.ep_list); + INIT_LIST_HEAD(&ep->queue); + ep->ep.ops = &ast_vhub_ep0_ops; + ep->ep.name = "ep0"; + ep->ep.caps.type_control = true; + usb_ep_set_maxpacket_limit(&ep->ep, AST_VHUB_EP0_MAX_PACKET); + ep->d_idx = 0; + ep->dev = dev; + ep->vhub = vhub; + ep->ep0.state = ep0_state_token; + INIT_LIST_HEAD(&ep->ep0.req.queue); + ep->ep0.req.internal = true; + + /* Small difference between vHub and devices */ + if (dev) { + ep->ep0.ctlstat = dev->regs + AST_VHUB_DEV_EP0_CTRL; + ep->ep0.setup = vhub->regs + + AST_VHUB_SETUP0 + 8 * (dev->index + 1); + ep->buf = vhub->ep0_bufs + + AST_VHUB_EP0_MAX_PACKET * (dev->index + 1); + ep->buf_dma = vhub->ep0_bufs_dma + + AST_VHUB_EP0_MAX_PACKET * (dev->index + 1); + } else { + ep->ep0.ctlstat = vhub->regs + AST_VHUB_EP0_CTRL; + ep->ep0.setup = vhub->regs + AST_VHUB_SETUP0; + ep->buf = vhub->ep0_bufs; + ep->buf_dma = vhub->ep0_bufs_dma; + } +} diff --git a/drivers/usb/gadget/udc/aspeed-vhub/epn.c b/drivers/usb/gadget/udc/aspeed-vhub/epn.c new file mode 100644 index 000000000..931f540a7 --- /dev/null +++ b/drivers/usb/gadget/udc/aspeed-vhub/epn.c @@ -0,0 +1,854 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * aspeed-vhub -- Driver for Aspeed SoC "vHub" USB gadget + * + * epn.c - Generic endpoints management + * + * Copyright 2017 IBM Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/delay.h> +#include <linux/ioport.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/list.h> +#include <linux/interrupt.h> +#include <linux/proc_fs.h> +#include <linux/prefetch.h> +#include <linux/clk.h> +#include <linux/usb/gadget.h> +#include <linux/of.h> +#include <linux/of_gpio.h> +#include <linux/regmap.h> +#include <linux/dma-mapping.h> + +#include "vhub.h" + +#define EXTRA_CHECKS + +#ifdef EXTRA_CHECKS +#define CHECK(ep, expr, fmt...) \ + do { \ + if (!(expr)) EPDBG(ep, "CHECK:" fmt); \ + } while(0) +#else +#define CHECK(ep, expr, fmt...) do { } while(0) +#endif + +static void ast_vhub_epn_kick(struct ast_vhub_ep *ep, struct ast_vhub_req *req) +{ + unsigned int act = req->req.actual; + unsigned int len = req->req.length; + unsigned int chunk; + + /* There should be no DMA ongoing */ + WARN_ON(req->active); + + /* Calculate next chunk size */ + chunk = len - act; + if (chunk > ep->ep.maxpacket) + chunk = ep->ep.maxpacket; + else if ((chunk < ep->ep.maxpacket) || !req->req.zero) + req->last_desc = 1; + + EPVDBG(ep, "kick req %p act=%d/%d chunk=%d last=%d\n", + req, act, len, chunk, req->last_desc); + + /* If DMA unavailable, using staging EP buffer */ + if (!req->req.dma) { + + /* For IN transfers, copy data over first */ + if (ep->epn.is_in) { + memcpy(ep->buf, req->req.buf + act, chunk); + vhub_dma_workaround(ep->buf); + } + writel(ep->buf_dma, ep->epn.regs + AST_VHUB_EP_DESC_BASE); + } else { + if (ep->epn.is_in) + vhub_dma_workaround(req->req.buf); + writel(req->req.dma + act, ep->epn.regs + AST_VHUB_EP_DESC_BASE); + } + + /* Start DMA */ + req->active = true; + writel(VHUB_EP_DMA_SET_TX_SIZE(chunk), + ep->epn.regs + AST_VHUB_EP_DESC_STATUS); + writel(VHUB_EP_DMA_SET_TX_SIZE(chunk) | VHUB_EP_DMA_SINGLE_KICK, + ep->epn.regs + AST_VHUB_EP_DESC_STATUS); +} + +static void ast_vhub_epn_handle_ack(struct ast_vhub_ep *ep) +{ + struct ast_vhub_req *req; + unsigned int len; + u32 stat; + + /* Read EP status */ + stat = readl(ep->epn.regs + AST_VHUB_EP_DESC_STATUS); + + /* Grab current request if any */ + req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req, queue); + + EPVDBG(ep, "ACK status=%08x is_in=%d, req=%p (active=%d)\n", + stat, ep->epn.is_in, req, req ? req->active : 0); + + /* In absence of a request, bail out, must have been dequeued */ + if (!req) + return; + + /* + * Request not active, move on to processing queue, active request + * was probably dequeued + */ + if (!req->active) + goto next_chunk; + + /* Check if HW has moved on */ + if (VHUB_EP_DMA_RPTR(stat) != 0) { + EPDBG(ep, "DMA read pointer not 0 !\n"); + return; + } + + /* No current DMA ongoing */ + req->active = false; + + /* Grab lenght out of HW */ + len = VHUB_EP_DMA_TX_SIZE(stat); + + /* If not using DMA, copy data out if needed */ + if (!req->req.dma && !ep->epn.is_in && len) + memcpy(req->req.buf + req->req.actual, ep->buf, len); + + /* Adjust size */ + req->req.actual += len; + + /* Check for short packet */ + if (len < ep->ep.maxpacket) + req->last_desc = 1; + + /* That's it ? complete the request and pick a new one */ + if (req->last_desc >= 0) { + ast_vhub_done(ep, req, 0); + req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req, + queue); + + /* + * Due to lock dropping inside "done" the next request could + * already be active, so check for that and bail if needed. + */ + if (!req || req->active) + return; + } + + next_chunk: + ast_vhub_epn_kick(ep, req); +} + +static inline unsigned int ast_vhub_count_free_descs(struct ast_vhub_ep *ep) +{ + /* + * d_next == d_last means descriptor list empty to HW, + * thus we can only have AST_VHUB_DESCS_COUNT-1 descriptors + * in the list + */ + return (ep->epn.d_last + AST_VHUB_DESCS_COUNT - ep->epn.d_next - 1) & + (AST_VHUB_DESCS_COUNT - 1); +} + +static void ast_vhub_epn_kick_desc(struct ast_vhub_ep *ep, + struct ast_vhub_req *req) +{ + struct ast_vhub_desc *desc = NULL; + unsigned int act = req->act_count; + unsigned int len = req->req.length; + unsigned int chunk; + + /* Mark request active if not already */ + req->active = true; + + /* If the request was already completely written, do nothing */ + if (req->last_desc >= 0) + return; + + EPVDBG(ep, "kick act=%d/%d chunk_max=%d free_descs=%d\n", + act, len, ep->epn.chunk_max, ast_vhub_count_free_descs(ep)); + + /* While we can create descriptors */ + while (ast_vhub_count_free_descs(ep) && req->last_desc < 0) { + unsigned int d_num; + + /* Grab next free descriptor */ + d_num = ep->epn.d_next; + desc = &ep->epn.descs[d_num]; + ep->epn.d_next = (d_num + 1) & (AST_VHUB_DESCS_COUNT - 1); + + /* Calculate next chunk size */ + chunk = len - act; + if (chunk <= ep->epn.chunk_max) { + /* + * Is this the last packet ? Because of having up to 8 + * packets in a descriptor we can't just compare "chunk" + * with ep.maxpacket. We have to see if it's a multiple + * of it to know if we have to send a zero packet. + * Sadly that involves a modulo which is a bit expensive + * but probably still better than not doing it. + */ + if (!chunk || !req->req.zero || (chunk % ep->ep.maxpacket) != 0) + req->last_desc = d_num; + } else { + chunk = ep->epn.chunk_max; + } + + EPVDBG(ep, " chunk: act=%d/%d chunk=%d last=%d desc=%d free=%d\n", + act, len, chunk, req->last_desc, d_num, + ast_vhub_count_free_descs(ep)); + + /* Populate descriptor */ + desc->w0 = cpu_to_le32(req->req.dma + act); + + /* Interrupt if end of request or no more descriptors */ + + /* + * TODO: Be smarter about it, if we don't have enough + * descriptors request an interrupt before queue empty + * or so in order to be able to populate more before + * the HW runs out. This isn't a problem at the moment + * as we use 256 descriptors and only put at most one + * request in the ring. + */ + desc->w1 = cpu_to_le32(VHUB_DSC1_IN_SET_LEN(chunk)); + if (req->last_desc >= 0 || !ast_vhub_count_free_descs(ep)) + desc->w1 |= cpu_to_le32(VHUB_DSC1_IN_INTERRUPT); + + /* Account packet */ + req->act_count = act = act + chunk; + } + + if (likely(desc)) + vhub_dma_workaround(desc); + + /* Tell HW about new descriptors */ + writel(VHUB_EP_DMA_SET_CPU_WPTR(ep->epn.d_next), + ep->epn.regs + AST_VHUB_EP_DESC_STATUS); + + EPVDBG(ep, "HW kicked, d_next=%d dstat=%08x\n", + ep->epn.d_next, readl(ep->epn.regs + AST_VHUB_EP_DESC_STATUS)); +} + +static void ast_vhub_epn_handle_ack_desc(struct ast_vhub_ep *ep) +{ + struct ast_vhub_req *req; + unsigned int len, d_last; + u32 stat, stat1; + + /* Read EP status, workaround HW race */ + do { + stat = readl(ep->epn.regs + AST_VHUB_EP_DESC_STATUS); + stat1 = readl(ep->epn.regs + AST_VHUB_EP_DESC_STATUS); + } while(stat != stat1); + + /* Extract RPTR */ + d_last = VHUB_EP_DMA_RPTR(stat); + + /* Grab current request if any */ + req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req, queue); + + EPVDBG(ep, "ACK status=%08x is_in=%d ep->d_last=%d..%d\n", + stat, ep->epn.is_in, ep->epn.d_last, d_last); + + /* Check all completed descriptors */ + while (ep->epn.d_last != d_last) { + struct ast_vhub_desc *desc; + unsigned int d_num; + bool is_last_desc; + + /* Grab next completed descriptor */ + d_num = ep->epn.d_last; + desc = &ep->epn.descs[d_num]; + ep->epn.d_last = (d_num + 1) & (AST_VHUB_DESCS_COUNT - 1); + + /* Grab len out of descriptor */ + len = VHUB_DSC1_IN_LEN(le32_to_cpu(desc->w1)); + + EPVDBG(ep, " desc %d len=%d req=%p (act=%d)\n", + d_num, len, req, req ? req->active : 0); + + /* If no active request pending, move on */ + if (!req || !req->active) + continue; + + /* Adjust size */ + req->req.actual += len; + + /* Is that the last chunk ? */ + is_last_desc = req->last_desc == d_num; + CHECK(ep, is_last_desc == (len < ep->ep.maxpacket || + (req->req.actual >= req->req.length && + !req->req.zero)), + "Last packet discrepancy: last_desc=%d len=%d r.act=%d " + "r.len=%d r.zero=%d mp=%d\n", + is_last_desc, len, req->req.actual, req->req.length, + req->req.zero, ep->ep.maxpacket); + + if (is_last_desc) { + /* + * Because we can only have one request at a time + * in our descriptor list in this implementation, + * d_last and ep->d_last should now be equal + */ + CHECK(ep, d_last == ep->epn.d_last, + "DMA read ptr mismatch %d vs %d\n", + d_last, ep->epn.d_last); + + /* Note: done will drop and re-acquire the lock */ + ast_vhub_done(ep, req, 0); + req = list_first_entry_or_null(&ep->queue, + struct ast_vhub_req, + queue); + break; + } + } + + /* More work ? */ + if (req) + ast_vhub_epn_kick_desc(ep, req); +} + +void ast_vhub_epn_ack_irq(struct ast_vhub_ep *ep) +{ + if (ep->epn.desc_mode) + ast_vhub_epn_handle_ack_desc(ep); + else + ast_vhub_epn_handle_ack(ep); +} + +static int ast_vhub_epn_queue(struct usb_ep* u_ep, struct usb_request *u_req, + gfp_t gfp_flags) +{ + struct ast_vhub_req *req = to_ast_req(u_req); + struct ast_vhub_ep *ep = to_ast_ep(u_ep); + struct ast_vhub *vhub = ep->vhub; + unsigned long flags; + bool empty; + int rc; + + /* Paranoid checks */ + if (!u_req || !u_req->complete || !u_req->buf) { + dev_warn(&vhub->pdev->dev, "Bogus EPn request ! u_req=%p\n", u_req); + if (u_req) { + dev_warn(&vhub->pdev->dev, "complete=%p internal=%d\n", + u_req->complete, req->internal); + } + return -EINVAL; + } + + /* Endpoint enabled ? */ + if (!ep->epn.enabled || !u_ep->desc || !ep->dev || !ep->d_idx || + !ep->dev->enabled || ep->dev->suspended) { + EPDBG(ep,"Enqueing request on wrong or disabled EP\n"); + return -ESHUTDOWN; + } + + /* Map request for DMA if possible. For now, the rule for DMA is + * that: + * + * * For single stage mode (no descriptors): + * + * - The buffer is aligned to a 8 bytes boundary (HW requirement) + * - For a OUT endpoint, the request size is a multiple of the EP + * packet size (otherwise the controller will DMA past the end + * of the buffer if the host is sending a too long packet). + * + * * For descriptor mode (tx only for now), always. + * + * We could relax the latter by making the decision to use the bounce + * buffer based on the size of a given *segment* of the request rather + * than the whole request. + */ + if (ep->epn.desc_mode || + ((((unsigned long)u_req->buf & 7) == 0) && + (ep->epn.is_in || !(u_req->length & (u_ep->maxpacket - 1))))) { + rc = usb_gadget_map_request_by_dev(&vhub->pdev->dev, u_req, + ep->epn.is_in); + if (rc) { + dev_warn(&vhub->pdev->dev, + "Request mapping failure %d\n", rc); + return rc; + } + } else + u_req->dma = 0; + + EPVDBG(ep, "enqueue req @%p\n", req); + EPVDBG(ep, " l=%d dma=0x%x zero=%d noshort=%d noirq=%d is_in=%d\n", + u_req->length, (u32)u_req->dma, u_req->zero, + u_req->short_not_ok, u_req->no_interrupt, + ep->epn.is_in); + + /* Initialize request progress fields */ + u_req->status = -EINPROGRESS; + u_req->actual = 0; + req->act_count = 0; + req->active = false; + req->last_desc = -1; + spin_lock_irqsave(&vhub->lock, flags); + empty = list_empty(&ep->queue); + + /* Add request to list and kick processing if empty */ + list_add_tail(&req->queue, &ep->queue); + if (empty) { + if (ep->epn.desc_mode) + ast_vhub_epn_kick_desc(ep, req); + else + ast_vhub_epn_kick(ep, req); + } + spin_unlock_irqrestore(&vhub->lock, flags); + + return 0; +} + +static void ast_vhub_stop_active_req(struct ast_vhub_ep *ep, + bool restart_ep) +{ + u32 state, reg, loops; + + /* Stop DMA activity */ + if (ep->epn.desc_mode) + writel(VHUB_EP_DMA_CTRL_RESET, ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); + else + writel(0, ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); + + /* Wait for it to complete */ + for (loops = 0; loops < 1000; loops++) { + state = readl(ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); + state = VHUB_EP_DMA_PROC_STATUS(state); + if (state == EP_DMA_PROC_RX_IDLE || + state == EP_DMA_PROC_TX_IDLE) + break; + udelay(1); + } + if (loops >= 1000) + dev_warn(&ep->vhub->pdev->dev, "Timeout waiting for DMA\n"); + + /* If we don't have to restart the endpoint, that's it */ + if (!restart_ep) + return; + + /* Restart the endpoint */ + if (ep->epn.desc_mode) { + /* + * Take out descriptors by resetting the DMA read + * pointer to be equal to the CPU write pointer. + * + * Note: If we ever support creating descriptors for + * requests that aren't the head of the queue, we + * may have to do something more complex here, + * especially if the request being taken out is + * not the current head descriptors. + */ + reg = VHUB_EP_DMA_SET_RPTR(ep->epn.d_next) | + VHUB_EP_DMA_SET_CPU_WPTR(ep->epn.d_next); + writel(reg, ep->epn.regs + AST_VHUB_EP_DESC_STATUS); + + /* Then turn it back on */ + writel(ep->epn.dma_conf, + ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); + } else { + /* Single mode: just turn it back on */ + writel(ep->epn.dma_conf, + ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); + } +} + +static int ast_vhub_epn_dequeue(struct usb_ep* u_ep, struct usb_request *u_req) +{ + struct ast_vhub_ep *ep = to_ast_ep(u_ep); + struct ast_vhub *vhub = ep->vhub; + struct ast_vhub_req *req; + unsigned long flags; + int rc = -EINVAL; + + spin_lock_irqsave(&vhub->lock, flags); + + /* Make sure it's actually queued on this endpoint */ + list_for_each_entry (req, &ep->queue, queue) { + if (&req->req == u_req) + break; + } + + if (&req->req == u_req) { + EPVDBG(ep, "dequeue req @%p active=%d\n", + req, req->active); + if (req->active) + ast_vhub_stop_active_req(ep, true); + ast_vhub_done(ep, req, -ECONNRESET); + rc = 0; + } + + spin_unlock_irqrestore(&vhub->lock, flags); + return rc; +} + +void ast_vhub_update_epn_stall(struct ast_vhub_ep *ep) +{ + u32 reg; + + if (WARN_ON(ep->d_idx == 0)) + return; + reg = readl(ep->epn.regs + AST_VHUB_EP_CONFIG); + if (ep->epn.stalled || ep->epn.wedged) + reg |= VHUB_EP_CFG_STALL_CTRL; + else + reg &= ~VHUB_EP_CFG_STALL_CTRL; + writel(reg, ep->epn.regs + AST_VHUB_EP_CONFIG); + + if (!ep->epn.stalled && !ep->epn.wedged) + writel(VHUB_EP_TOGGLE_SET_EPNUM(ep->epn.g_idx), + ep->vhub->regs + AST_VHUB_EP_TOGGLE); +} + +static int ast_vhub_set_halt_and_wedge(struct usb_ep* u_ep, bool halt, + bool wedge) +{ + struct ast_vhub_ep *ep = to_ast_ep(u_ep); + struct ast_vhub *vhub = ep->vhub; + unsigned long flags; + + EPDBG(ep, "Set halt (%d) & wedge (%d)\n", halt, wedge); + + if (!u_ep || !u_ep->desc) + return -EINVAL; + if (ep->d_idx == 0) + return 0; + if (ep->epn.is_iso) + return -EOPNOTSUPP; + + spin_lock_irqsave(&vhub->lock, flags); + + /* Fail with still-busy IN endpoints */ + if (halt && ep->epn.is_in && !list_empty(&ep->queue)) { + spin_unlock_irqrestore(&vhub->lock, flags); + return -EAGAIN; + } + ep->epn.stalled = halt; + ep->epn.wedged = wedge; + ast_vhub_update_epn_stall(ep); + + spin_unlock_irqrestore(&vhub->lock, flags); + + return 0; +} + +static int ast_vhub_epn_set_halt(struct usb_ep *u_ep, int value) +{ + return ast_vhub_set_halt_and_wedge(u_ep, value != 0, false); +} + +static int ast_vhub_epn_set_wedge(struct usb_ep *u_ep) +{ + return ast_vhub_set_halt_and_wedge(u_ep, true, true); +} + +static int ast_vhub_epn_disable(struct usb_ep* u_ep) +{ + struct ast_vhub_ep *ep = to_ast_ep(u_ep); + struct ast_vhub *vhub = ep->vhub; + unsigned long flags; + u32 imask, ep_ier; + + EPDBG(ep, "Disabling !\n"); + + spin_lock_irqsave(&vhub->lock, flags); + + ep->epn.enabled = false; + + /* Stop active DMA if any */ + ast_vhub_stop_active_req(ep, false); + + /* Disable endpoint */ + writel(0, ep->epn.regs + AST_VHUB_EP_CONFIG); + + /* Disable ACK interrupt */ + imask = VHUB_EP_IRQ(ep->epn.g_idx); + ep_ier = readl(vhub->regs + AST_VHUB_EP_ACK_IER); + ep_ier &= ~imask; + writel(ep_ier, vhub->regs + AST_VHUB_EP_ACK_IER); + writel(imask, vhub->regs + AST_VHUB_EP_ACK_ISR); + + /* Nuke all pending requests */ + ast_vhub_nuke(ep, -ESHUTDOWN); + + /* No more descriptor associated with request */ + ep->ep.desc = NULL; + + spin_unlock_irqrestore(&vhub->lock, flags); + + return 0; +} + +static int ast_vhub_epn_enable(struct usb_ep* u_ep, + const struct usb_endpoint_descriptor *desc) +{ + static const char *ep_type_string[] __maybe_unused = { "ctrl", + "isoc", + "bulk", + "intr" }; + struct ast_vhub_ep *ep = to_ast_ep(u_ep); + struct ast_vhub_dev *dev; + struct ast_vhub *vhub; + u16 maxpacket, type; + unsigned long flags; + u32 ep_conf, ep_ier, imask; + + /* Check arguments */ + if (!u_ep || !desc) + return -EINVAL; + + maxpacket = usb_endpoint_maxp(desc); + if (!ep->d_idx || !ep->dev || + desc->bDescriptorType != USB_DT_ENDPOINT || + maxpacket == 0 || maxpacket > ep->ep.maxpacket) { + EPDBG(ep, "Invalid EP enable,d_idx=%d,dev=%p,type=%d,mp=%d/%d\n", + ep->d_idx, ep->dev, desc->bDescriptorType, + maxpacket, ep->ep.maxpacket); + return -EINVAL; + } + if (ep->d_idx != usb_endpoint_num(desc)) { + EPDBG(ep, "EP number mismatch !\n"); + return -EINVAL; + } + + if (ep->epn.enabled) { + EPDBG(ep, "Already enabled\n"); + return -EBUSY; + } + dev = ep->dev; + vhub = ep->vhub; + + /* Check device state */ + if (!dev->driver) { + EPDBG(ep, "Bogus device state: driver=%p speed=%d\n", + dev->driver, dev->gadget.speed); + return -ESHUTDOWN; + } + + /* Grab some info from the descriptor */ + ep->epn.is_in = usb_endpoint_dir_in(desc); + ep->ep.maxpacket = maxpacket; + type = usb_endpoint_type(desc); + ep->epn.d_next = ep->epn.d_last = 0; + ep->epn.is_iso = false; + ep->epn.stalled = false; + ep->epn.wedged = false; + + EPDBG(ep, "Enabling [%s] %s num %d maxpacket=%d\n", + ep->epn.is_in ? "in" : "out", ep_type_string[type], + usb_endpoint_num(desc), maxpacket); + + /* Can we use DMA descriptor mode ? */ + ep->epn.desc_mode = ep->epn.descs && ep->epn.is_in; + if (ep->epn.desc_mode) + memset(ep->epn.descs, 0, 8 * AST_VHUB_DESCS_COUNT); + + /* + * Large send function can send up to 8 packets from + * one descriptor with a limit of 4095 bytes. + */ + ep->epn.chunk_max = ep->ep.maxpacket; + if (ep->epn.is_in) { + ep->epn.chunk_max <<= 3; + while (ep->epn.chunk_max > 4095) + ep->epn.chunk_max -= ep->ep.maxpacket; + } + + switch(type) { + case USB_ENDPOINT_XFER_CONTROL: + EPDBG(ep, "Only one control endpoint\n"); + return -EINVAL; + case USB_ENDPOINT_XFER_INT: + ep_conf = VHUB_EP_CFG_SET_TYPE(EP_TYPE_INT); + break; + case USB_ENDPOINT_XFER_BULK: + ep_conf = VHUB_EP_CFG_SET_TYPE(EP_TYPE_BULK); + break; + case USB_ENDPOINT_XFER_ISOC: + ep_conf = VHUB_EP_CFG_SET_TYPE(EP_TYPE_ISO); + ep->epn.is_iso = true; + break; + default: + return -EINVAL; + } + + /* Encode the rest of the EP config register */ + if (maxpacket < 1024) + ep_conf |= VHUB_EP_CFG_SET_MAX_PKT(maxpacket); + if (!ep->epn.is_in) + ep_conf |= VHUB_EP_CFG_DIR_OUT; + ep_conf |= VHUB_EP_CFG_SET_EP_NUM(usb_endpoint_num(desc)); + ep_conf |= VHUB_EP_CFG_ENABLE; + ep_conf |= VHUB_EP_CFG_SET_DEV(dev->index + 1); + EPVDBG(ep, "config=%08x\n", ep_conf); + + spin_lock_irqsave(&vhub->lock, flags); + + /* Disable HW and reset DMA */ + writel(0, ep->epn.regs + AST_VHUB_EP_CONFIG); + writel(VHUB_EP_DMA_CTRL_RESET, + ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); + + /* Configure and enable */ + writel(ep_conf, ep->epn.regs + AST_VHUB_EP_CONFIG); + + if (ep->epn.desc_mode) { + /* Clear DMA status, including the DMA read ptr */ + writel(0, ep->epn.regs + AST_VHUB_EP_DESC_STATUS); + + /* Set descriptor base */ + writel(ep->epn.descs_dma, + ep->epn.regs + AST_VHUB_EP_DESC_BASE); + + /* Set base DMA config value */ + ep->epn.dma_conf = VHUB_EP_DMA_DESC_MODE; + if (ep->epn.is_in) + ep->epn.dma_conf |= VHUB_EP_DMA_IN_LONG_MODE; + + /* First reset and disable all operations */ + writel(ep->epn.dma_conf | VHUB_EP_DMA_CTRL_RESET, + ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); + + /* Enable descriptor mode */ + writel(ep->epn.dma_conf, + ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); + } else { + /* Set base DMA config value */ + ep->epn.dma_conf = VHUB_EP_DMA_SINGLE_STAGE; + + /* Reset and switch to single stage mode */ + writel(ep->epn.dma_conf | VHUB_EP_DMA_CTRL_RESET, + ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); + writel(ep->epn.dma_conf, + ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); + writel(0, ep->epn.regs + AST_VHUB_EP_DESC_STATUS); + } + + /* Cleanup data toggle just in case */ + writel(VHUB_EP_TOGGLE_SET_EPNUM(ep->epn.g_idx), + vhub->regs + AST_VHUB_EP_TOGGLE); + + /* Cleanup and enable ACK interrupt */ + imask = VHUB_EP_IRQ(ep->epn.g_idx); + writel(imask, vhub->regs + AST_VHUB_EP_ACK_ISR); + ep_ier = readl(vhub->regs + AST_VHUB_EP_ACK_IER); + ep_ier |= imask; + writel(ep_ier, vhub->regs + AST_VHUB_EP_ACK_IER); + + /* Woot, we are online ! */ + ep->epn.enabled = true; + + spin_unlock_irqrestore(&vhub->lock, flags); + + return 0; +} + +static void ast_vhub_epn_dispose(struct usb_ep *u_ep) +{ + struct ast_vhub_ep *ep = to_ast_ep(u_ep); + + if (WARN_ON(!ep->dev || !ep->d_idx)) + return; + + EPDBG(ep, "Releasing endpoint\n"); + + /* Take it out of the EP list */ + list_del_init(&ep->ep.ep_list); + + /* Mark the address free in the device */ + ep->dev->epns[ep->d_idx - 1] = NULL; + + /* Free name & DMA buffers */ + kfree(ep->ep.name); + ep->ep.name = NULL; + dma_free_coherent(&ep->vhub->pdev->dev, + AST_VHUB_EPn_MAX_PACKET + + 8 * AST_VHUB_DESCS_COUNT, + ep->buf, ep->buf_dma); + ep->buf = NULL; + ep->epn.descs = NULL; + + /* Mark free */ + ep->dev = NULL; +} + +static const struct usb_ep_ops ast_vhub_epn_ops = { + .enable = ast_vhub_epn_enable, + .disable = ast_vhub_epn_disable, + .dispose = ast_vhub_epn_dispose, + .queue = ast_vhub_epn_queue, + .dequeue = ast_vhub_epn_dequeue, + .set_halt = ast_vhub_epn_set_halt, + .set_wedge = ast_vhub_epn_set_wedge, + .alloc_request = ast_vhub_alloc_request, + .free_request = ast_vhub_free_request, +}; + +struct ast_vhub_ep *ast_vhub_alloc_epn(struct ast_vhub_dev *d, u8 addr) +{ + struct ast_vhub *vhub = d->vhub; + struct ast_vhub_ep *ep; + unsigned long flags; + int i; + + /* Find a free one (no device) */ + spin_lock_irqsave(&vhub->lock, flags); + for (i = 0; i < AST_VHUB_NUM_GEN_EPs; i++) + if (vhub->epns[i].dev == NULL) + break; + if (i >= AST_VHUB_NUM_GEN_EPs) { + spin_unlock_irqrestore(&vhub->lock, flags); + return NULL; + } + + /* Set it up */ + ep = &vhub->epns[i]; + ep->dev = d; + spin_unlock_irqrestore(&vhub->lock, flags); + + DDBG(d, "Allocating gen EP %d for addr %d\n", i, addr); + INIT_LIST_HEAD(&ep->queue); + ep->d_idx = addr; + ep->vhub = vhub; + ep->ep.ops = &ast_vhub_epn_ops; + ep->ep.name = kasprintf(GFP_KERNEL, "ep%d", addr); + d->epns[addr-1] = ep; + ep->epn.g_idx = i; + ep->epn.regs = vhub->regs + 0x200 + (i * 0x10); + + ep->buf = dma_alloc_coherent(&vhub->pdev->dev, + AST_VHUB_EPn_MAX_PACKET + + 8 * AST_VHUB_DESCS_COUNT, + &ep->buf_dma, GFP_KERNEL); + if (!ep->buf) { + kfree(ep->ep.name); + ep->ep.name = NULL; + return NULL; + } + ep->epn.descs = ep->buf + AST_VHUB_EPn_MAX_PACKET; + ep->epn.descs_dma = ep->buf_dma + AST_VHUB_EPn_MAX_PACKET; + + usb_ep_set_maxpacket_limit(&ep->ep, AST_VHUB_EPn_MAX_PACKET); + list_add_tail(&ep->ep.ep_list, &d->gadget.ep_list); + ep->ep.caps.type_iso = true; + ep->ep.caps.type_bulk = true; + ep->ep.caps.type_int = true; + ep->ep.caps.dir_in = true; + ep->ep.caps.dir_out = true; + + return ep; +} diff --git a/drivers/usb/gadget/udc/aspeed-vhub/hub.c b/drivers/usb/gadget/udc/aspeed-vhub/hub.c new file mode 100644 index 000000000..35ba0e55a --- /dev/null +++ b/drivers/usb/gadget/udc/aspeed-vhub/hub.c @@ -0,0 +1,829 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * aspeed-vhub -- Driver for Aspeed SoC "vHub" USB gadget + * + * hub.c - virtual hub handling + * + * Copyright 2017 IBM Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/delay.h> +#include <linux/ioport.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/list.h> +#include <linux/interrupt.h> +#include <linux/proc_fs.h> +#include <linux/prefetch.h> +#include <linux/clk.h> +#include <linux/usb/gadget.h> +#include <linux/of.h> +#include <linux/of_gpio.h> +#include <linux/regmap.h> +#include <linux/dma-mapping.h> +#include <linux/bcd.h> +#include <linux/version.h> +#include <linux/usb.h> +#include <linux/usb/hcd.h> + +#include "vhub.h" + +/* usb 2.0 hub device descriptor + * + * A few things we may want to improve here: + * + * - We may need to indicate TT support + * - We may need a device qualifier descriptor + * as devices can pretend to be usb1 or 2 + * - Make vid/did overridable + * - make it look like usb1 if usb1 mode forced + */ +#define KERNEL_REL bin2bcd(((LINUX_VERSION_CODE >> 16) & 0x0ff)) +#define KERNEL_VER bin2bcd(((LINUX_VERSION_CODE >> 8) & 0x0ff)) + +enum { + AST_VHUB_STR_MANUF = 3, + AST_VHUB_STR_PRODUCT = 2, + AST_VHUB_STR_SERIAL = 1, +}; + +static const struct usb_device_descriptor ast_vhub_dev_desc = { + .bLength = USB_DT_DEVICE_SIZE, + .bDescriptorType = USB_DT_DEVICE, + .bcdUSB = cpu_to_le16(0x0200), + .bDeviceClass = USB_CLASS_HUB, + .bDeviceSubClass = 0, + .bDeviceProtocol = 1, + .bMaxPacketSize0 = 64, + .idVendor = cpu_to_le16(0x1d6b), + .idProduct = cpu_to_le16(0x0107), + .bcdDevice = cpu_to_le16(0x0100), + .iManufacturer = AST_VHUB_STR_MANUF, + .iProduct = AST_VHUB_STR_PRODUCT, + .iSerialNumber = AST_VHUB_STR_SERIAL, + .bNumConfigurations = 1, +}; + +/* Patches to the above when forcing USB1 mode */ +static void ast_vhub_patch_dev_desc_usb1(struct usb_device_descriptor *desc) +{ + desc->bcdUSB = cpu_to_le16(0x0100); + desc->bDeviceProtocol = 0; +} + +/* + * Configuration descriptor: same comments as above + * regarding handling USB1 mode. + */ + +/* + * We don't use sizeof() as Linux definition of + * struct usb_endpoint_descriptor contains 2 + * extra bytes + */ +#define AST_VHUB_CONF_DESC_SIZE (USB_DT_CONFIG_SIZE + \ + USB_DT_INTERFACE_SIZE + \ + USB_DT_ENDPOINT_SIZE) + +static const struct ast_vhub_full_cdesc { + struct usb_config_descriptor cfg; + struct usb_interface_descriptor intf; + struct usb_endpoint_descriptor ep; +} __attribute__ ((packed)) ast_vhub_conf_desc = { + .cfg = { + .bLength = USB_DT_CONFIG_SIZE, + .bDescriptorType = USB_DT_CONFIG, + .wTotalLength = cpu_to_le16(AST_VHUB_CONF_DESC_SIZE), + .bNumInterfaces = 1, + .bConfigurationValue = 1, + .iConfiguration = 0, + .bmAttributes = USB_CONFIG_ATT_ONE | + USB_CONFIG_ATT_SELFPOWER | + USB_CONFIG_ATT_WAKEUP, + .bMaxPower = 0, + }, + .intf = { + .bLength = USB_DT_INTERFACE_SIZE, + .bDescriptorType = USB_DT_INTERFACE, + .bInterfaceNumber = 0, + .bAlternateSetting = 0, + .bNumEndpoints = 1, + .bInterfaceClass = USB_CLASS_HUB, + .bInterfaceSubClass = 0, + .bInterfaceProtocol = 0, + .iInterface = 0, + }, + .ep = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = 0x81, + .bmAttributes = USB_ENDPOINT_XFER_INT, + .wMaxPacketSize = cpu_to_le16(1), + .bInterval = 0x0c, + }, +}; + +#define AST_VHUB_HUB_DESC_SIZE (USB_DT_HUB_NONVAR_SIZE + 2) + +static const struct usb_hub_descriptor ast_vhub_hub_desc = { + .bDescLength = AST_VHUB_HUB_DESC_SIZE, + .bDescriptorType = USB_DT_HUB, + .bNbrPorts = AST_VHUB_NUM_PORTS, + .wHubCharacteristics = cpu_to_le16(HUB_CHAR_NO_LPSM), + .bPwrOn2PwrGood = 10, + .bHubContrCurrent = 0, + .u.hs.DeviceRemovable[0] = 0, + .u.hs.DeviceRemovable[1] = 0xff, +}; + +/* + * These strings converted to UTF-16 must be smaller than + * our EP0 buffer. + */ +static const struct usb_string ast_vhub_str_array[] = { + { + .id = AST_VHUB_STR_SERIAL, + .s = "00000000" + }, + { + .id = AST_VHUB_STR_PRODUCT, + .s = "USB Virtual Hub" + }, + { + .id = AST_VHUB_STR_MANUF, + .s = "Aspeed" + }, + { } +}; + +static const struct usb_gadget_strings ast_vhub_strings = { + .language = 0x0409, + .strings = (struct usb_string *)ast_vhub_str_array +}; + +static int ast_vhub_hub_dev_status(struct ast_vhub_ep *ep, + u16 wIndex, u16 wValue) +{ + u8 st0; + + EPDBG(ep, "GET_STATUS(dev)\n"); + + /* + * Mark it as self-powered, I doubt the BMC is powered off + * the USB bus ... + */ + st0 = 1 << USB_DEVICE_SELF_POWERED; + + /* + * Need to double check how remote wakeup actually works + * on that chip and what triggers it. + */ + if (ep->vhub->wakeup_en) + st0 |= 1 << USB_DEVICE_REMOTE_WAKEUP; + + return ast_vhub_simple_reply(ep, st0, 0); +} + +static int ast_vhub_hub_ep_status(struct ast_vhub_ep *ep, + u16 wIndex, u16 wValue) +{ + int ep_num; + u8 st0 = 0; + + ep_num = wIndex & USB_ENDPOINT_NUMBER_MASK; + EPDBG(ep, "GET_STATUS(ep%d)\n", ep_num); + + /* On the hub we have only EP 0 and 1 */ + if (ep_num == 1) { + if (ep->vhub->ep1_stalled) + st0 |= 1 << USB_ENDPOINT_HALT; + } else if (ep_num != 0) + return std_req_stall; + + return ast_vhub_simple_reply(ep, st0, 0); +} + +static int ast_vhub_hub_dev_feature(struct ast_vhub_ep *ep, + u16 wIndex, u16 wValue, + bool is_set) +{ + EPDBG(ep, "%s_FEATURE(dev val=%02x)\n", + is_set ? "SET" : "CLEAR", wValue); + + if (wValue != USB_DEVICE_REMOTE_WAKEUP) + return std_req_stall; + + ep->vhub->wakeup_en = is_set; + EPDBG(ep, "Hub remote wakeup %s\n", + is_set ? "enabled" : "disabled"); + + return std_req_complete; +} + +static int ast_vhub_hub_ep_feature(struct ast_vhub_ep *ep, + u16 wIndex, u16 wValue, + bool is_set) +{ + int ep_num; + u32 reg; + + ep_num = wIndex & USB_ENDPOINT_NUMBER_MASK; + EPDBG(ep, "%s_FEATURE(ep%d val=%02x)\n", + is_set ? "SET" : "CLEAR", ep_num, wValue); + + if (ep_num > 1) + return std_req_stall; + if (wValue != USB_ENDPOINT_HALT) + return std_req_stall; + if (ep_num == 0) + return std_req_complete; + + EPDBG(ep, "%s stall on EP 1\n", + is_set ? "setting" : "clearing"); + + ep->vhub->ep1_stalled = is_set; + reg = readl(ep->vhub->regs + AST_VHUB_EP1_CTRL); + if (is_set) { + reg |= VHUB_EP1_CTRL_STALL; + } else { + reg &= ~VHUB_EP1_CTRL_STALL; + reg |= VHUB_EP1_CTRL_RESET_TOGGLE; + } + writel(reg, ep->vhub->regs + AST_VHUB_EP1_CTRL); + + return std_req_complete; +} + +static int ast_vhub_rep_desc(struct ast_vhub_ep *ep, + u8 desc_type, u16 len) +{ + size_t dsize; + + EPDBG(ep, "GET_DESCRIPTOR(type:%d)\n", desc_type); + + /* + * Copy first to EP buffer and send from there, so + * we can do some in-place patching if needed. We know + * the EP buffer is big enough but ensure that doesn't + * change. We do that now rather than later after we + * have checked sizes etc... to avoid a gcc bug where + * it thinks len is constant and barfs about read + * overflows in memcpy. + */ + switch(desc_type) { + case USB_DT_DEVICE: + dsize = USB_DT_DEVICE_SIZE; + memcpy(ep->buf, &ast_vhub_dev_desc, dsize); + BUILD_BUG_ON(dsize > sizeof(ast_vhub_dev_desc)); + BUILD_BUG_ON(USB_DT_DEVICE_SIZE >= AST_VHUB_EP0_MAX_PACKET); + break; + case USB_DT_CONFIG: + dsize = AST_VHUB_CONF_DESC_SIZE; + memcpy(ep->buf, &ast_vhub_conf_desc, dsize); + BUILD_BUG_ON(dsize > sizeof(ast_vhub_conf_desc)); + BUILD_BUG_ON(AST_VHUB_CONF_DESC_SIZE >= AST_VHUB_EP0_MAX_PACKET); + break; + case USB_DT_HUB: + dsize = AST_VHUB_HUB_DESC_SIZE; + memcpy(ep->buf, &ast_vhub_hub_desc, dsize); + BUILD_BUG_ON(dsize > sizeof(ast_vhub_hub_desc)); + BUILD_BUG_ON(AST_VHUB_HUB_DESC_SIZE >= AST_VHUB_EP0_MAX_PACKET); + break; + default: + return std_req_stall; + } + + /* Crop requested length */ + if (len > dsize) + len = dsize; + + /* Patch it if forcing USB1 */ + if (desc_type == USB_DT_DEVICE && ep->vhub->force_usb1) + ast_vhub_patch_dev_desc_usb1(ep->buf); + + /* Shoot it from the EP buffer */ + return ast_vhub_reply(ep, NULL, len); +} + +static int ast_vhub_rep_string(struct ast_vhub_ep *ep, + u8 string_id, u16 lang_id, + u16 len) +{ + int rc = usb_gadget_get_string (&ast_vhub_strings, string_id, ep->buf); + + /* + * This should never happen unless we put too big strings in + * the array above + */ + BUG_ON(rc >= AST_VHUB_EP0_MAX_PACKET); + + if (rc < 0) + return std_req_stall; + + /* Shoot it from the EP buffer */ + return ast_vhub_reply(ep, NULL, min_t(u16, rc, len)); +} + +enum std_req_rc ast_vhub_std_hub_request(struct ast_vhub_ep *ep, + struct usb_ctrlrequest *crq) +{ + struct ast_vhub *vhub = ep->vhub; + u16 wValue, wIndex, wLength; + + wValue = le16_to_cpu(crq->wValue); + wIndex = le16_to_cpu(crq->wIndex); + wLength = le16_to_cpu(crq->wLength); + + /* First packet, grab speed */ + if (vhub->speed == USB_SPEED_UNKNOWN) { + u32 ustat = readl(vhub->regs + AST_VHUB_USBSTS); + if (ustat & VHUB_USBSTS_HISPEED) + vhub->speed = USB_SPEED_HIGH; + else + vhub->speed = USB_SPEED_FULL; + UDCDBG(vhub, "USB status=%08x speed=%s\n", ustat, + vhub->speed == USB_SPEED_HIGH ? "high" : "full"); + } + + switch ((crq->bRequestType << 8) | crq->bRequest) { + /* SET_ADDRESS */ + case DeviceOutRequest | USB_REQ_SET_ADDRESS: + EPDBG(ep, "SET_ADDRESS: Got address %x\n", wValue); + writel(wValue, vhub->regs + AST_VHUB_CONF); + return std_req_complete; + + /* GET_STATUS */ + case DeviceRequest | USB_REQ_GET_STATUS: + return ast_vhub_hub_dev_status(ep, wIndex, wValue); + case InterfaceRequest | USB_REQ_GET_STATUS: + return ast_vhub_simple_reply(ep, 0, 0); + case EndpointRequest | USB_REQ_GET_STATUS: + return ast_vhub_hub_ep_status(ep, wIndex, wValue); + + /* SET/CLEAR_FEATURE */ + case DeviceOutRequest | USB_REQ_SET_FEATURE: + return ast_vhub_hub_dev_feature(ep, wIndex, wValue, true); + case DeviceOutRequest | USB_REQ_CLEAR_FEATURE: + return ast_vhub_hub_dev_feature(ep, wIndex, wValue, false); + case EndpointOutRequest | USB_REQ_SET_FEATURE: + return ast_vhub_hub_ep_feature(ep, wIndex, wValue, true); + case EndpointOutRequest | USB_REQ_CLEAR_FEATURE: + return ast_vhub_hub_ep_feature(ep, wIndex, wValue, false); + + /* GET/SET_CONFIGURATION */ + case DeviceRequest | USB_REQ_GET_CONFIGURATION: + return ast_vhub_simple_reply(ep, 1); + case DeviceOutRequest | USB_REQ_SET_CONFIGURATION: + if (wValue != 1) + return std_req_stall; + return std_req_complete; + + /* GET_DESCRIPTOR */ + case DeviceRequest | USB_REQ_GET_DESCRIPTOR: + switch (wValue >> 8) { + case USB_DT_DEVICE: + case USB_DT_CONFIG: + return ast_vhub_rep_desc(ep, wValue >> 8, + wLength); + case USB_DT_STRING: + return ast_vhub_rep_string(ep, wValue & 0xff, + wIndex, wLength); + } + return std_req_stall; + + /* GET/SET_INTERFACE */ + case DeviceRequest | USB_REQ_GET_INTERFACE: + return ast_vhub_simple_reply(ep, 0); + case DeviceOutRequest | USB_REQ_SET_INTERFACE: + if (wValue != 0 || wIndex != 0) + return std_req_stall; + return std_req_complete; + } + return std_req_stall; +} + +static void ast_vhub_update_hub_ep1(struct ast_vhub *vhub, + unsigned int port) +{ + /* Update HW EP1 response */ + u32 reg = readl(vhub->regs + AST_VHUB_EP1_STS_CHG); + u32 pmask = (1 << (port + 1)); + if (vhub->ports[port].change) + reg |= pmask; + else + reg &= ~pmask; + writel(reg, vhub->regs + AST_VHUB_EP1_STS_CHG); +} + +static void ast_vhub_change_port_stat(struct ast_vhub *vhub, + unsigned int port, + u16 clr_flags, + u16 set_flags, + bool set_c) +{ + struct ast_vhub_port *p = &vhub->ports[port]; + u16 prev; + + /* Update port status */ + prev = p->status; + p->status = (prev & ~clr_flags) | set_flags; + DDBG(&p->dev, "port %d status %04x -> %04x (C=%d)\n", + port + 1, prev, p->status, set_c); + + /* Update change bits if needed */ + if (set_c) { + u16 chg = p->status ^ prev; + + /* Only these are relevant for change */ + chg &= USB_PORT_STAT_C_CONNECTION | + USB_PORT_STAT_C_ENABLE | + USB_PORT_STAT_C_SUSPEND | + USB_PORT_STAT_C_OVERCURRENT | + USB_PORT_STAT_C_RESET | + USB_PORT_STAT_C_L1; + p->change |= chg; + + ast_vhub_update_hub_ep1(vhub, port); + } +} + +static void ast_vhub_send_host_wakeup(struct ast_vhub *vhub) +{ + u32 reg = readl(vhub->regs + AST_VHUB_CTRL); + UDCDBG(vhub, "Waking up host !\n"); + reg |= VHUB_CTRL_MANUAL_REMOTE_WAKEUP; + writel(reg, vhub->regs + AST_VHUB_CTRL); +} + +void ast_vhub_device_connect(struct ast_vhub *vhub, + unsigned int port, bool on) +{ + if (on) + ast_vhub_change_port_stat(vhub, port, 0, + USB_PORT_STAT_CONNECTION, true); + else + ast_vhub_change_port_stat(vhub, port, + USB_PORT_STAT_CONNECTION | + USB_PORT_STAT_ENABLE, + 0, true); + + /* + * If the hub is set to wakup the host on connection events + * then send a wakeup. + */ + if (vhub->wakeup_en) + ast_vhub_send_host_wakeup(vhub); +} + +static void ast_vhub_wake_work(struct work_struct *work) +{ + struct ast_vhub *vhub = container_of(work, + struct ast_vhub, + wake_work); + unsigned long flags; + unsigned int i; + + /* + * Wake all sleeping ports. If a port is suspended by + * the host suspend (without explicit state suspend), + * we let the normal host wake path deal with it later. + */ + spin_lock_irqsave(&vhub->lock, flags); + for (i = 0; i < AST_VHUB_NUM_PORTS; i++) { + struct ast_vhub_port *p = &vhub->ports[i]; + + if (!(p->status & USB_PORT_STAT_SUSPEND)) + continue; + ast_vhub_change_port_stat(vhub, i, + USB_PORT_STAT_SUSPEND, + 0, true); + ast_vhub_dev_resume(&p->dev); + } + ast_vhub_send_host_wakeup(vhub); + spin_unlock_irqrestore(&vhub->lock, flags); +} + +void ast_vhub_hub_wake_all(struct ast_vhub *vhub) +{ + /* + * A device is trying to wake the world, because this + * can recurse into the device, we break the call chain + * using a work queue + */ + schedule_work(&vhub->wake_work); +} + +static void ast_vhub_port_reset(struct ast_vhub *vhub, u8 port) +{ + struct ast_vhub_port *p = &vhub->ports[port]; + u16 set, clr, speed; + + /* First mark disabled */ + ast_vhub_change_port_stat(vhub, port, + USB_PORT_STAT_ENABLE | + USB_PORT_STAT_SUSPEND, + USB_PORT_STAT_RESET, + false); + + if (!p->dev.driver) + return; + + /* + * This will either "start" the port or reset the + * device if already started... + */ + ast_vhub_dev_reset(&p->dev); + + /* Grab the right speed */ + speed = p->dev.driver->max_speed; + if (speed == USB_SPEED_UNKNOWN || speed > vhub->speed) + speed = vhub->speed; + + switch (speed) { + case USB_SPEED_LOW: + set = USB_PORT_STAT_LOW_SPEED; + clr = USB_PORT_STAT_HIGH_SPEED; + break; + case USB_SPEED_FULL: + set = 0; + clr = USB_PORT_STAT_LOW_SPEED | + USB_PORT_STAT_HIGH_SPEED; + break; + case USB_SPEED_HIGH: + set = USB_PORT_STAT_HIGH_SPEED; + clr = USB_PORT_STAT_LOW_SPEED; + break; + default: + UDCDBG(vhub, "Unsupported speed %d when" + " connecting device\n", + speed); + return; + } + clr |= USB_PORT_STAT_RESET; + set |= USB_PORT_STAT_ENABLE; + + /* This should ideally be delayed ... */ + ast_vhub_change_port_stat(vhub, port, clr, set, true); +} + +static enum std_req_rc ast_vhub_set_port_feature(struct ast_vhub_ep *ep, + u8 port, u16 feat) +{ + struct ast_vhub *vhub = ep->vhub; + struct ast_vhub_port *p; + + if (port == 0 || port > AST_VHUB_NUM_PORTS) + return std_req_stall; + port--; + p = &vhub->ports[port]; + + switch(feat) { + case USB_PORT_FEAT_SUSPEND: + if (!(p->status & USB_PORT_STAT_ENABLE)) + return std_req_complete; + ast_vhub_change_port_stat(vhub, port, + 0, USB_PORT_STAT_SUSPEND, + false); + ast_vhub_dev_suspend(&p->dev); + return std_req_complete; + case USB_PORT_FEAT_RESET: + EPDBG(ep, "Port reset !\n"); + ast_vhub_port_reset(vhub, port); + return std_req_complete; + case USB_PORT_FEAT_POWER: + /* + * On Power-on, we mark the connected flag changed, + * if there's a connected device, some hosts will + * otherwise fail to detect it. + */ + if (p->status & USB_PORT_STAT_CONNECTION) { + p->change |= USB_PORT_STAT_C_CONNECTION; + ast_vhub_update_hub_ep1(vhub, port); + } + return std_req_complete; + case USB_PORT_FEAT_TEST: + case USB_PORT_FEAT_INDICATOR: + /* We don't do anything with these */ + return std_req_complete; + } + return std_req_stall; +} + +static enum std_req_rc ast_vhub_clr_port_feature(struct ast_vhub_ep *ep, + u8 port, u16 feat) +{ + struct ast_vhub *vhub = ep->vhub; + struct ast_vhub_port *p; + + if (port == 0 || port > AST_VHUB_NUM_PORTS) + return std_req_stall; + port--; + p = &vhub->ports[port]; + + switch(feat) { + case USB_PORT_FEAT_ENABLE: + ast_vhub_change_port_stat(vhub, port, + USB_PORT_STAT_ENABLE | + USB_PORT_STAT_SUSPEND, 0, + false); + ast_vhub_dev_suspend(&p->dev); + return std_req_complete; + case USB_PORT_FEAT_SUSPEND: + if (!(p->status & USB_PORT_STAT_SUSPEND)) + return std_req_complete; + ast_vhub_change_port_stat(vhub, port, + USB_PORT_STAT_SUSPEND, 0, + false); + ast_vhub_dev_resume(&p->dev); + return std_req_complete; + case USB_PORT_FEAT_POWER: + /* We don't do power control */ + return std_req_complete; + case USB_PORT_FEAT_INDICATOR: + /* We don't have indicators */ + return std_req_complete; + case USB_PORT_FEAT_C_CONNECTION: + case USB_PORT_FEAT_C_ENABLE: + case USB_PORT_FEAT_C_SUSPEND: + case USB_PORT_FEAT_C_OVER_CURRENT: + case USB_PORT_FEAT_C_RESET: + /* Clear state-change feature */ + p->change &= ~(1u << (feat - 16)); + ast_vhub_update_hub_ep1(vhub, port); + return std_req_complete; + } + return std_req_stall; +} + +static enum std_req_rc ast_vhub_get_port_stat(struct ast_vhub_ep *ep, + u8 port) +{ + struct ast_vhub *vhub = ep->vhub; + u16 stat, chg; + + if (port == 0 || port > AST_VHUB_NUM_PORTS) + return std_req_stall; + port--; + + stat = vhub->ports[port].status; + chg = vhub->ports[port].change; + + /* We always have power */ + stat |= USB_PORT_STAT_POWER; + + EPDBG(ep, " port status=%04x change=%04x\n", stat, chg); + + return ast_vhub_simple_reply(ep, + stat & 0xff, + stat >> 8, + chg & 0xff, + chg >> 8); +} + +enum std_req_rc ast_vhub_class_hub_request(struct ast_vhub_ep *ep, + struct usb_ctrlrequest *crq) +{ + u16 wValue, wIndex, wLength; + + wValue = le16_to_cpu(crq->wValue); + wIndex = le16_to_cpu(crq->wIndex); + wLength = le16_to_cpu(crq->wLength); + + switch ((crq->bRequestType << 8) | crq->bRequest) { + case GetHubStatus: + EPDBG(ep, "GetHubStatus\n"); + return ast_vhub_simple_reply(ep, 0, 0, 0, 0); + case GetPortStatus: + EPDBG(ep, "GetPortStatus(%d)\n", wIndex & 0xff); + return ast_vhub_get_port_stat(ep, wIndex & 0xf); + case GetHubDescriptor: + if (wValue != (USB_DT_HUB << 8)) + return std_req_stall; + EPDBG(ep, "GetHubDescriptor(%d)\n", wIndex & 0xff); + return ast_vhub_rep_desc(ep, USB_DT_HUB, wLength); + case SetHubFeature: + case ClearHubFeature: + EPDBG(ep, "Get/SetHubFeature(%d)\n", wValue); + /* No feature, just complete the requests */ + if (wValue == C_HUB_LOCAL_POWER || + wValue == C_HUB_OVER_CURRENT) + return std_req_complete; + return std_req_stall; + case SetPortFeature: + EPDBG(ep, "SetPortFeature(%d,%d)\n", wIndex & 0xf, wValue); + return ast_vhub_set_port_feature(ep, wIndex & 0xf, wValue); + case ClearPortFeature: + EPDBG(ep, "ClearPortFeature(%d,%d)\n", wIndex & 0xf, wValue); + return ast_vhub_clr_port_feature(ep, wIndex & 0xf, wValue); + default: + EPDBG(ep, "Unknown class request\n"); + } + return std_req_stall; +} + +void ast_vhub_hub_suspend(struct ast_vhub *vhub) +{ + unsigned int i; + + UDCDBG(vhub, "USB bus suspend\n"); + + if (vhub->suspended) + return; + + vhub->suspended = true; + + /* + * Forward to unsuspended ports without changing + * their connection status. + */ + for (i = 0; i < AST_VHUB_NUM_PORTS; i++) { + struct ast_vhub_port *p = &vhub->ports[i]; + + if (!(p->status & USB_PORT_STAT_SUSPEND)) + ast_vhub_dev_suspend(&p->dev); + } +} + +void ast_vhub_hub_resume(struct ast_vhub *vhub) +{ + unsigned int i; + + UDCDBG(vhub, "USB bus resume\n"); + + if (!vhub->suspended) + return; + + vhub->suspended = false; + + /* + * Forward to unsuspended ports without changing + * their connection status. + */ + for (i = 0; i < AST_VHUB_NUM_PORTS; i++) { + struct ast_vhub_port *p = &vhub->ports[i]; + + if (!(p->status & USB_PORT_STAT_SUSPEND)) + ast_vhub_dev_resume(&p->dev); + } +} + +void ast_vhub_hub_reset(struct ast_vhub *vhub) +{ + unsigned int i; + + UDCDBG(vhub, "USB bus reset\n"); + + /* + * Is the speed known ? If not we don't care, we aren't + * initialized yet and ports haven't been enabled. + */ + if (vhub->speed == USB_SPEED_UNKNOWN) + return; + + /* We aren't suspended anymore obviously */ + vhub->suspended = false; + + /* No speed set */ + vhub->speed = USB_SPEED_UNKNOWN; + + /* Wakeup not enabled anymore */ + vhub->wakeup_en = false; + + /* + * Clear all port status, disable gadgets and "suspend" + * them. They will be woken up by a port reset. + */ + for (i = 0; i < AST_VHUB_NUM_PORTS; i++) { + struct ast_vhub_port *p = &vhub->ports[i]; + + /* Only keep the connected flag */ + p->status &= USB_PORT_STAT_CONNECTION; + p->change = 0; + + /* Suspend the gadget if any */ + ast_vhub_dev_suspend(&p->dev); + } + + /* Cleanup HW */ + writel(0, vhub->regs + AST_VHUB_CONF); + writel(0, vhub->regs + AST_VHUB_EP0_CTRL); + writel(VHUB_EP1_CTRL_RESET_TOGGLE | + VHUB_EP1_CTRL_ENABLE, + vhub->regs + AST_VHUB_EP1_CTRL); + writel(0, vhub->regs + AST_VHUB_EP1_STS_CHG); +} + +void ast_vhub_init_hub(struct ast_vhub *vhub) +{ + vhub->speed = USB_SPEED_UNKNOWN; + INIT_WORK(&vhub->wake_work, ast_vhub_wake_work); +} + diff --git a/drivers/usb/gadget/udc/aspeed-vhub/vhub.h b/drivers/usb/gadget/udc/aspeed-vhub/vhub.h new file mode 100644 index 000000000..4ed03d33a --- /dev/null +++ b/drivers/usb/gadget/udc/aspeed-vhub/vhub.h @@ -0,0 +1,547 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +#ifndef __ASPEED_VHUB_H +#define __ASPEED_VHUB_H + +/***************************** + * * + * VHUB register definitions * + * * + *****************************/ + +#define AST_VHUB_CTRL 0x00 /* Root Function Control & Status Register */ +#define AST_VHUB_CONF 0x04 /* Root Configuration Setting Register */ +#define AST_VHUB_IER 0x08 /* Interrupt Ctrl Register */ +#define AST_VHUB_ISR 0x0C /* Interrupt Status Register */ +#define AST_VHUB_EP_ACK_IER 0x10 /* Programmable Endpoint Pool ACK Interrupt Enable Register */ +#define AST_VHUB_EP_NACK_IER 0x14 /* Programmable Endpoint Pool NACK Interrupt Enable Register */ +#define AST_VHUB_EP_ACK_ISR 0x18 /* Programmable Endpoint Pool ACK Interrupt Status Register */ +#define AST_VHUB_EP_NACK_ISR 0x1C /* Programmable Endpoint Pool NACK Interrupt Status Register */ +#define AST_VHUB_SW_RESET 0x20 /* Device Controller Soft Reset Enable Register */ +#define AST_VHUB_USBSTS 0x24 /* USB Status Register */ +#define AST_VHUB_EP_TOGGLE 0x28 /* Programmable Endpoint Pool Data Toggle Value Set */ +#define AST_VHUB_ISO_FAIL_ACC 0x2C /* Isochronous Transaction Fail Accumulator */ +#define AST_VHUB_EP0_CTRL 0x30 /* Endpoint 0 Contrl/Status Register */ +#define AST_VHUB_EP0_DATA 0x34 /* Base Address of Endpoint 0 In/OUT Data Buffer Register */ +#define AST_VHUB_EP1_CTRL 0x38 /* Endpoint 1 Contrl/Status Register */ +#define AST_VHUB_EP1_STS_CHG 0x3C /* Endpoint 1 Status Change Bitmap Data */ +#define AST_VHUB_SETUP0 0x80 /* Root Device Setup Data Buffer0 */ +#define AST_VHUB_SETUP1 0x84 /* Root Device Setup Data Buffer1 */ + +/* Main control reg */ +#define VHUB_CTRL_PHY_CLK (1 << 31) +#define VHUB_CTRL_PHY_LOOP_TEST (1 << 25) +#define VHUB_CTRL_DN_PWN (1 << 24) +#define VHUB_CTRL_DP_PWN (1 << 23) +#define VHUB_CTRL_LONG_DESC (1 << 18) +#define VHUB_CTRL_ISO_RSP_CTRL (1 << 17) +#define VHUB_CTRL_SPLIT_IN (1 << 16) +#define VHUB_CTRL_LOOP_T_RESULT (1 << 15) +#define VHUB_CTRL_LOOP_T_STS (1 << 14) +#define VHUB_CTRL_PHY_BIST_RESULT (1 << 13) +#define VHUB_CTRL_PHY_BIST_CTRL (1 << 12) +#define VHUB_CTRL_PHY_RESET_DIS (1 << 11) +#define VHUB_CTRL_SET_TEST_MODE(x) ((x) << 8) +#define VHUB_CTRL_MANUAL_REMOTE_WAKEUP (1 << 4) +#define VHUB_CTRL_AUTO_REMOTE_WAKEUP (1 << 3) +#define VHUB_CTRL_CLK_STOP_SUSPEND (1 << 2) +#define VHUB_CTRL_FULL_SPEED_ONLY (1 << 1) +#define VHUB_CTRL_UPSTREAM_CONNECT (1 << 0) + +/* IER & ISR */ +#define VHUB_IRQ_USB_CMD_DEADLOCK (1 << 18) +#define VHUB_IRQ_EP_POOL_NAK (1 << 17) +#define VHUB_IRQ_EP_POOL_ACK_STALL (1 << 16) +#define VHUB_IRQ_DEVICE5 (1 << 13) +#define VHUB_IRQ_DEVICE4 (1 << 12) +#define VHUB_IRQ_DEVICE3 (1 << 11) +#define VHUB_IRQ_DEVICE2 (1 << 10) +#define VHUB_IRQ_DEVICE1 (1 << 9) +#define VHUB_IRQ_BUS_RESUME (1 << 8) +#define VHUB_IRQ_BUS_SUSPEND (1 << 7) +#define VHUB_IRQ_BUS_RESET (1 << 6) +#define VHUB_IRQ_HUB_EP1_IN_DATA_ACK (1 << 5) +#define VHUB_IRQ_HUB_EP0_IN_DATA_NAK (1 << 4) +#define VHUB_IRQ_HUB_EP0_IN_ACK_STALL (1 << 3) +#define VHUB_IRQ_HUB_EP0_OUT_NAK (1 << 2) +#define VHUB_IRQ_HUB_EP0_OUT_ACK_STALL (1 << 1) +#define VHUB_IRQ_HUB_EP0_SETUP (1 << 0) +#define VHUB_IRQ_ACK_ALL 0x1ff + +/* SW reset reg */ +#define VHUB_SW_RESET_EP_POOL (1 << 9) +#define VHUB_SW_RESET_DMA_CONTROLLER (1 << 8) +#define VHUB_SW_RESET_DEVICE5 (1 << 5) +#define VHUB_SW_RESET_DEVICE4 (1 << 4) +#define VHUB_SW_RESET_DEVICE3 (1 << 3) +#define VHUB_SW_RESET_DEVICE2 (1 << 2) +#define VHUB_SW_RESET_DEVICE1 (1 << 1) +#define VHUB_SW_RESET_ROOT_HUB (1 << 0) +#define VHUB_SW_RESET_ALL (VHUB_SW_RESET_EP_POOL | \ + VHUB_SW_RESET_DMA_CONTROLLER | \ + VHUB_SW_RESET_DEVICE5 | \ + VHUB_SW_RESET_DEVICE4 | \ + VHUB_SW_RESET_DEVICE3 | \ + VHUB_SW_RESET_DEVICE2 | \ + VHUB_SW_RESET_DEVICE1 | \ + VHUB_SW_RESET_ROOT_HUB) +/* EP ACK/NACK IRQ masks */ +#define VHUB_EP_IRQ(n) (1 << (n)) +#define VHUB_EP_IRQ_ALL 0x7fff /* 15 EPs */ + +/* USB status reg */ +#define VHUB_USBSTS_HISPEED (1 << 27) + +/* EP toggle */ +#define VHUB_EP_TOGGLE_VALUE (1 << 8) +#define VHUB_EP_TOGGLE_SET_EPNUM(x) ((x) & 0x1f) + +/* HUB EP0 control */ +#define VHUB_EP0_CTRL_STALL (1 << 0) +#define VHUB_EP0_TX_BUFF_RDY (1 << 1) +#define VHUB_EP0_RX_BUFF_RDY (1 << 2) +#define VHUB_EP0_RX_LEN(x) (((x) >> 16) & 0x7f) +#define VHUB_EP0_SET_TX_LEN(x) (((x) & 0x7f) << 8) + +/* HUB EP1 control */ +#define VHUB_EP1_CTRL_RESET_TOGGLE (1 << 2) +#define VHUB_EP1_CTRL_STALL (1 << 1) +#define VHUB_EP1_CTRL_ENABLE (1 << 0) + +/*********************************** + * * + * per-device register definitions * + * * + ***********************************/ +#define AST_VHUB_DEV_EN_CTRL 0x00 +#define AST_VHUB_DEV_ISR 0x04 +#define AST_VHUB_DEV_EP0_CTRL 0x08 +#define AST_VHUB_DEV_EP0_DATA 0x0c + +/* Device enable control */ +#define VHUB_DEV_EN_SET_ADDR(x) ((x) << 8) +#define VHUB_DEV_EN_ADDR_MASK ((0xff) << 8) +#define VHUB_DEV_EN_EP0_NAK_IRQEN (1 << 6) +#define VHUB_DEV_EN_EP0_IN_ACK_IRQEN (1 << 5) +#define VHUB_DEV_EN_EP0_OUT_NAK_IRQEN (1 << 4) +#define VHUB_DEV_EN_EP0_OUT_ACK_IRQEN (1 << 3) +#define VHUB_DEV_EN_EP0_SETUP_IRQEN (1 << 2) +#define VHUB_DEV_EN_SPEED_SEL_HIGH (1 << 1) +#define VHUB_DEV_EN_ENABLE_PORT (1 << 0) + +/* Interrupt status */ +#define VHUV_DEV_IRQ_EP0_IN_DATA_NACK (1 << 4) +#define VHUV_DEV_IRQ_EP0_IN_ACK_STALL (1 << 3) +#define VHUV_DEV_IRQ_EP0_OUT_DATA_NACK (1 << 2) +#define VHUV_DEV_IRQ_EP0_OUT_ACK_STALL (1 << 1) +#define VHUV_DEV_IRQ_EP0_SETUP (1 << 0) + +/* Control bits. + * + * Note: The driver relies on the bulk of those bits + * matching corresponding vHub EP0 control bits + */ +#define VHUB_DEV_EP0_CTRL_STALL VHUB_EP0_CTRL_STALL +#define VHUB_DEV_EP0_TX_BUFF_RDY VHUB_EP0_TX_BUFF_RDY +#define VHUB_DEV_EP0_RX_BUFF_RDY VHUB_EP0_RX_BUFF_RDY +#define VHUB_DEV_EP0_RX_LEN(x) VHUB_EP0_RX_LEN(x) +#define VHUB_DEV_EP0_SET_TX_LEN(x) VHUB_EP0_SET_TX_LEN(x) + +/************************************* + * * + * per-endpoint register definitions * + * * + *************************************/ + +#define AST_VHUB_EP_CONFIG 0x00 +#define AST_VHUB_EP_DMA_CTLSTAT 0x04 +#define AST_VHUB_EP_DESC_BASE 0x08 +#define AST_VHUB_EP_DESC_STATUS 0x0C + +/* EP config reg */ +#define VHUB_EP_CFG_SET_MAX_PKT(x) (((x) & 0x3ff) << 16) +#define VHUB_EP_CFG_AUTO_DATA_DISABLE (1 << 13) +#define VHUB_EP_CFG_STALL_CTRL (1 << 12) +#define VHUB_EP_CFG_SET_EP_NUM(x) (((x) & 0xf) << 8) +#define VHUB_EP_CFG_SET_TYPE(x) ((x) << 5) +#define EP_TYPE_OFF 0 +#define EP_TYPE_BULK 1 +#define EP_TYPE_INT 2 +#define EP_TYPE_ISO 3 +#define VHUB_EP_CFG_DIR_OUT (1 << 4) +#define VHUB_EP_CFG_SET_DEV(x) ((x) << 1) +#define VHUB_EP_CFG_ENABLE (1 << 0) + +/* EP DMA control */ +#define VHUB_EP_DMA_PROC_STATUS(x) (((x) >> 4) & 0xf) +#define EP_DMA_PROC_RX_IDLE 0 +#define EP_DMA_PROC_TX_IDLE 8 +#define VHUB_EP_DMA_IN_LONG_MODE (1 << 3) +#define VHUB_EP_DMA_OUT_CONTIG_MODE (1 << 3) +#define VHUB_EP_DMA_CTRL_RESET (1 << 2) +#define VHUB_EP_DMA_SINGLE_STAGE (1 << 1) +#define VHUB_EP_DMA_DESC_MODE (1 << 0) + +/* EP DMA status */ +#define VHUB_EP_DMA_SET_TX_SIZE(x) ((x) << 16) +#define VHUB_EP_DMA_TX_SIZE(x) (((x) >> 16) & 0x7ff) +#define VHUB_EP_DMA_RPTR(x) (((x) >> 8) & 0xff) +#define VHUB_EP_DMA_SET_RPTR(x) (((x) & 0xff) << 8) +#define VHUB_EP_DMA_SET_CPU_WPTR(x) (x) +#define VHUB_EP_DMA_SINGLE_KICK (1 << 0) /* WPTR = 1 for single mode */ + +/******************************* + * * + * DMA descriptors definitions * + * * + *******************************/ + +/* Desc W1 IN */ +#define VHUB_DSC1_IN_INTERRUPT (1 << 31) +#define VHUB_DSC1_IN_SPID_DATA0 (0 << 14) +#define VHUB_DSC1_IN_SPID_DATA2 (1 << 14) +#define VHUB_DSC1_IN_SPID_DATA1 (2 << 14) +#define VHUB_DSC1_IN_SPID_MDATA (3 << 14) +#define VHUB_DSC1_IN_SET_LEN(x) ((x) & 0xfff) +#define VHUB_DSC1_IN_LEN(x) ((x) & 0xfff) + +/**************************************** + * * + * Data structures and misc definitions * + * * + ****************************************/ + +#define AST_VHUB_NUM_GEN_EPs 15 /* Generic non-0 EPs */ +#define AST_VHUB_NUM_PORTS 5 /* vHub ports */ +#define AST_VHUB_EP0_MAX_PACKET 64 /* EP0's max packet size */ +#define AST_VHUB_EPn_MAX_PACKET 1024 /* Generic EPs max packet size */ +#define AST_VHUB_DESCS_COUNT 256 /* Use 256 descriptor mode (valid + * values are 256 and 32) + */ + +struct ast_vhub; +struct ast_vhub_dev; + +/* + * DMA descriptor (generic EPs only, currently only used + * for IN endpoints + */ +struct ast_vhub_desc { + __le32 w0; + __le32 w1; +}; + +/* A transfer request, either core-originated or internal */ +struct ast_vhub_req { + struct usb_request req; + struct list_head queue; + + /* Actual count written to descriptors (desc mode only) */ + unsigned int act_count; + + /* + * Desc number of the final packet or -1. For non-desc + * mode (or ep0), any >= 0 value means "last packet" + */ + int last_desc; + + /* Request active (pending DMAs) */ + bool active : 1; + + /* Internal request (don't call back core) */ + bool internal : 1; +}; +#define to_ast_req(__ureq) container_of(__ureq, struct ast_vhub_req, req) + +/* Current state of an EP0 */ +enum ep0_state { + ep0_state_token, + ep0_state_data, + ep0_state_status, +}; + +/* + * An endpoint, either generic, ep0, actual gadget EP + * or internal use vhub EP0. vhub EP1 doesn't have an + * associated structure as it's mostly HW managed. + */ +struct ast_vhub_ep { + struct usb_ep ep; + + /* Request queue */ + struct list_head queue; + + /* EP index in the device, 0 means this is an EP0 */ + unsigned int d_idx; + + /* Dev pointer or NULL for vHub EP0 */ + struct ast_vhub_dev *dev; + + /* vHub itself */ + struct ast_vhub *vhub; + + /* + * DMA buffer for EP0, fallback DMA buffer for misaligned + * OUT transfers for generic EPs + */ + void *buf; + dma_addr_t buf_dma; + + /* The rest depends on the EP type */ + union { + /* EP0 (either device or vhub) */ + struct { + /* + * EP0 registers are "similar" for + * vHub and devices but located in + * different places. + */ + void __iomem *ctlstat; + void __iomem *setup; + + /* Current state & direction */ + enum ep0_state state; + bool dir_in; + + /* Internal use request */ + struct ast_vhub_req req; + } ep0; + + /* Generic endpoint (aka EPn) */ + struct { + /* Registers */ + void __iomem *regs; + + /* Index in global pool (0..14) */ + unsigned int g_idx; + + /* DMA Descriptors */ + struct ast_vhub_desc *descs; + dma_addr_t descs_dma; + unsigned int d_next; + unsigned int d_last; + unsigned int dma_conf; + + /* Max chunk size for IN EPs */ + unsigned int chunk_max; + + /* State flags */ + bool is_in : 1; + bool is_iso : 1; + bool stalled : 1; + bool wedged : 1; + bool enabled : 1; + bool desc_mode : 1; + } epn; + }; +}; +#define to_ast_ep(__uep) container_of(__uep, struct ast_vhub_ep, ep) + +/* A device attached to a vHub port */ +struct ast_vhub_dev { + struct ast_vhub *vhub; + void __iomem *regs; + + /* Device index (0...4) and name string */ + unsigned int index; + const char *name; + + /* sysfs enclosure for the gadget gunk */ + struct device *port_dev; + + /* Link to gadget core */ + struct usb_gadget gadget; + struct usb_gadget_driver *driver; + bool registered : 1; + bool wakeup_en : 1; + bool suspended : 1; + bool enabled : 1; + + /* Endpoint structures */ + struct ast_vhub_ep ep0; + struct ast_vhub_ep *epns[AST_VHUB_NUM_GEN_EPs]; + +}; +#define to_ast_dev(__g) container_of(__g, struct ast_vhub_dev, gadget) + +/* Per vhub port stateinfo structure */ +struct ast_vhub_port { + /* Port status & status change registers */ + u16 status; + u16 change; + + /* Associated device slot */ + struct ast_vhub_dev dev; +}; + +/* Global vhub structure */ +struct ast_vhub { + struct platform_device *pdev; + void __iomem *regs; + int irq; + spinlock_t lock; + struct work_struct wake_work; + struct clk *clk; + + /* EP0 DMA buffers allocated in one chunk */ + void *ep0_bufs; + dma_addr_t ep0_bufs_dma; + + /* EP0 of the vhub itself */ + struct ast_vhub_ep ep0; + + /* State of vhub ep1 */ + bool ep1_stalled : 1; + + /* Per-port info */ + struct ast_vhub_port ports[AST_VHUB_NUM_PORTS]; + + /* Generic EP data structures */ + struct ast_vhub_ep epns[AST_VHUB_NUM_GEN_EPs]; + + /* Upstream bus is suspended ? */ + bool suspended : 1; + + /* Hub itself can signal remote wakeup */ + bool wakeup_en : 1; + + /* Force full speed only */ + bool force_usb1 : 1; + + /* Upstream bus speed captured at bus reset */ + unsigned int speed; +}; + +/* Standard request handlers result codes */ +enum std_req_rc { + std_req_stall = -1, /* Stall requested */ + std_req_complete = 0, /* Request completed with no data */ + std_req_data = 1, /* Request completed with data */ + std_req_driver = 2, /* Pass to driver pls */ +}; + +#ifdef CONFIG_USB_GADGET_VERBOSE +#define UDCVDBG(u, fmt...) dev_dbg(&(u)->pdev->dev, fmt) + +#define EPVDBG(ep, fmt, ...) do { \ + dev_dbg(&(ep)->vhub->pdev->dev, \ + "%s:EP%d " fmt, \ + (ep)->dev ? (ep)->dev->name : "hub", \ + (ep)->d_idx, ##__VA_ARGS__); \ + } while(0) + +#define DVDBG(d, fmt, ...) do { \ + dev_dbg(&(d)->vhub->pdev->dev, \ + "%s " fmt, (d)->name, \ + ##__VA_ARGS__); \ + } while(0) + +#else +#define UDCVDBG(u, fmt...) do { } while(0) +#define EPVDBG(ep, fmt, ...) do { } while(0) +#define DVDBG(d, fmt, ...) do { } while(0) +#endif + +#ifdef CONFIG_USB_GADGET_DEBUG +#define UDCDBG(u, fmt...) dev_dbg(&(u)->pdev->dev, fmt) + +#define EPDBG(ep, fmt, ...) do { \ + dev_dbg(&(ep)->vhub->pdev->dev, \ + "%s:EP%d " fmt, \ + (ep)->dev ? (ep)->dev->name : "hub", \ + (ep)->d_idx, ##__VA_ARGS__); \ + } while(0) + +#define DDBG(d, fmt, ...) do { \ + dev_dbg(&(d)->vhub->pdev->dev, \ + "%s " fmt, (d)->name, \ + ##__VA_ARGS__); \ + } while(0) +#else +#define UDCDBG(u, fmt...) do { } while(0) +#define EPDBG(ep, fmt, ...) do { } while(0) +#define DDBG(d, fmt, ...) do { } while(0) +#endif + +static inline void vhub_dma_workaround(void *addr) +{ + /* + * This works around a confirmed HW issue with the Aspeed chip. + * + * The core uses a different bus to memory than the AHB going to + * the USB device controller. Due to the latter having a higher + * priority than the core for arbitration on that bus, it's + * possible for an MMIO to the device, followed by a DMA by the + * device from memory to all be performed and services before + * a previous store to memory gets completed. + * + * This the following scenario can happen: + * + * - Driver writes to a DMA descriptor (Mbus) + * - Driver writes to the MMIO register to start the DMA (AHB) + * - The gadget sees the second write and sends a read of the + * descriptor to the memory controller (Mbus) + * - The gadget hits memory before the descriptor write + * causing it to read an obsolete value. + * + * Thankfully the problem is limited to the USB gadget device, other + * masters in the SoC all have a lower priority than the core, thus + * ensuring that the store by the core arrives first. + * + * The workaround consists of using a dummy read of the memory before + * doing the MMIO writes. This will ensure that the previous writes + * have been "pushed out". + */ + mb(); + (void)__raw_readl((void __iomem *)addr); +} + +/* core.c */ +void ast_vhub_done(struct ast_vhub_ep *ep, struct ast_vhub_req *req, + int status); +void ast_vhub_nuke(struct ast_vhub_ep *ep, int status); +struct usb_request *ast_vhub_alloc_request(struct usb_ep *u_ep, + gfp_t gfp_flags); +void ast_vhub_free_request(struct usb_ep *u_ep, struct usb_request *u_req); +void ast_vhub_init_hw(struct ast_vhub *vhub); + +/* ep0.c */ +void ast_vhub_ep0_handle_ack(struct ast_vhub_ep *ep, bool in_ack); +void ast_vhub_ep0_handle_setup(struct ast_vhub_ep *ep); +void ast_vhub_init_ep0(struct ast_vhub *vhub, struct ast_vhub_ep *ep, + struct ast_vhub_dev *dev); +int ast_vhub_reply(struct ast_vhub_ep *ep, char *ptr, int len); +int __ast_vhub_simple_reply(struct ast_vhub_ep *ep, int len, ...); +#define ast_vhub_simple_reply(udc, ...) \ + __ast_vhub_simple_reply((udc), \ + sizeof((u8[]) { __VA_ARGS__ })/sizeof(u8), \ + __VA_ARGS__) + +/* hub.c */ +void ast_vhub_init_hub(struct ast_vhub *vhub); +enum std_req_rc ast_vhub_std_hub_request(struct ast_vhub_ep *ep, + struct usb_ctrlrequest *crq); +enum std_req_rc ast_vhub_class_hub_request(struct ast_vhub_ep *ep, + struct usb_ctrlrequest *crq); +void ast_vhub_device_connect(struct ast_vhub *vhub, unsigned int port, + bool on); +void ast_vhub_hub_suspend(struct ast_vhub *vhub); +void ast_vhub_hub_resume(struct ast_vhub *vhub); +void ast_vhub_hub_reset(struct ast_vhub *vhub); +void ast_vhub_hub_wake_all(struct ast_vhub *vhub); + +/* dev.c */ +int ast_vhub_init_dev(struct ast_vhub *vhub, unsigned int idx); +void ast_vhub_del_dev(struct ast_vhub_dev *d); +void ast_vhub_dev_irq(struct ast_vhub_dev *d); +int ast_vhub_std_dev_request(struct ast_vhub_ep *ep, + struct usb_ctrlrequest *crq); + +/* epn.c */ +void ast_vhub_epn_ack_irq(struct ast_vhub_ep *ep); +void ast_vhub_update_epn_stall(struct ast_vhub_ep *ep); +struct ast_vhub_ep *ast_vhub_alloc_epn(struct ast_vhub_dev *d, u8 addr); +void ast_vhub_dev_suspend(struct ast_vhub_dev *d); +void ast_vhub_dev_resume(struct ast_vhub_dev *d); +void ast_vhub_dev_reset(struct ast_vhub_dev *d); + +#endif /* __ASPEED_VHUB_H */ |