diff options
Diffstat (limited to 'drivers/usb/gadget/udc/aspeed-vhub/dev.c')
| -rw-r--r-- | drivers/usb/gadget/udc/aspeed-vhub/dev.c | 589 |
1 files changed, 589 insertions, 0 deletions
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; +} |