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linux-zen-server/drivers/usb/gadget/udc/aspeed-vhub/hub.c

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Initial commit
2023-08-30 17:53:23 +02:00
// SPDX-License-Identifier: GPL-2.0+
/*
* aspeed-vhub -- Driver for Aspeed SoC "vHub" USB gadget
*
* hub.c - virtual hub handling
*
* Copyright 2017 IBM Corporation
*/
#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_MAJOR)
#define KERNEL_VER bin2bcd(LINUX_VERSION_PATCHLEVEL)
enum {
AST_VHUB_STR_INDEX_MAX = 4,
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,
};
static const struct usb_qualifier_descriptor ast_vhub_qual_desc = {
.bLength = 0xA,
.bDescriptorType = USB_DT_DEVICE_QUALIFIER,
.bcdUSB = cpu_to_le16(0x0200),
.bDeviceClass = USB_CLASS_HUB,
.bDeviceSubClass = 0,
.bDeviceProtocol = 0,
.bMaxPacketSize0 = 64,
.bNumConfigurations = 1,
.bRESERVED = 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 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)
{
u32 val;
EPDBG(ep, "%s_FEATURE(dev val=%02x)\n",
is_set ? "SET" : "CLEAR", wValue);
if (wValue == USB_DEVICE_REMOTE_WAKEUP) {
ep->vhub->wakeup_en = is_set;
EPDBG(ep, "Hub remote wakeup %s\n",
is_set ? "enabled" : "disabled");
return std_req_complete;
}
if (wValue == USB_DEVICE_TEST_MODE) {
val = readl(ep->vhub->regs + AST_VHUB_CTRL);
val &= ~GENMASK(10, 8);
val |= VHUB_CTRL_SET_TEST_MODE((wIndex >> 8) & 0x7);
writel(val, ep->vhub->regs + AST_VHUB_CTRL);
return std_req_complete;
}
return std_req_stall;
}
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;
struct ast_vhub *vhub = ep->vhub;
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, &vhub->vhub_dev_desc, dsize);
BUILD_BUG_ON(dsize > sizeof(vhub->vhub_dev_desc));
BUILD_BUG_ON(USB_DT_DEVICE_SIZE >= AST_VHUB_EP0_MAX_PACKET);
break;
case USB_DT_OTHER_SPEED_CONFIG:
case USB_DT_CONFIG:
dsize = AST_VHUB_CONF_DESC_SIZE;
memcpy(ep->buf, &vhub->vhub_conf_desc, dsize);
((u8 *)ep->buf)[1] = desc_type;
BUILD_BUG_ON(dsize > sizeof(vhub->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, &vhub->vhub_hub_desc, dsize);
BUILD_BUG_ON(dsize > sizeof(vhub->vhub_hub_desc));
BUILD_BUG_ON(AST_VHUB_HUB_DESC_SIZE >= AST_VHUB_EP0_MAX_PACKET);
break;
case USB_DT_DEVICE_QUALIFIER:
dsize = sizeof(vhub->vhub_qual_desc);
memcpy(ep->buf, &vhub->vhub_qual_desc, dsize);
break;
default:
return std_req_stall;
}
/* Crop requested length */
if (len > dsize)
len = dsize;
/* Shoot it from the EP buffer */
return ast_vhub_reply(ep, NULL, len);
}
static struct usb_gadget_strings*
ast_vhub_str_of_container(struct usb_gadget_string_container *container)
{
return (struct usb_gadget_strings *)container->stash;
}
static int ast_vhub_collect_languages(struct ast_vhub *vhub, void *buf,
size_t size)
{
int rc, hdr_len, nlangs, max_langs;
struct usb_gadget_strings *lang_str;
struct usb_gadget_string_container *container;
struct usb_string_descriptor *sdesc = buf;
nlangs = 0;
hdr_len = sizeof(struct usb_descriptor_header);
max_langs = (size - hdr_len) / sizeof(sdesc->wData[0]);
list_for_each_entry(container, &vhub->vhub_str_desc, list) {
if (nlangs >= max_langs)
break;
lang_str = ast_vhub_str_of_container(container);
sdesc->wData[nlangs++] = cpu_to_le16(lang_str->language);
}
rc = hdr_len + nlangs * sizeof(sdesc->wData[0]);
sdesc->bLength = rc;
sdesc->bDescriptorType = USB_DT_STRING;
return rc;
}
static struct usb_gadget_strings *ast_vhub_lookup_string(struct ast_vhub *vhub,
u16 lang_id)
{
struct usb_gadget_strings *lang_str;
struct usb_gadget_string_container *container;
list_for_each_entry(container, &vhub->vhub_str_desc, list) {
lang_str = ast_vhub_str_of_container(container);
if (lang_str->language == lang_id)
return lang_str;
}
return NULL;
}
static int ast_vhub_rep_string(struct ast_vhub_ep *ep,
u8 string_id, u16 lang_id,
u16 len)
{
int rc;
u8 buf[256];
struct ast_vhub *vhub = ep->vhub;
struct usb_gadget_strings *lang_str;
if (string_id == 0) {
rc = ast_vhub_collect_languages(vhub, buf, sizeof(buf));
} else {
lang_str = ast_vhub_lookup_string(vhub, lang_id);
if (!lang_str)
return std_req_stall;
rc = usb_gadget_get_string(lang_str, string_id, buf);
}
if (rc < 0 || rc >= AST_VHUB_EP0_MAX_PACKET)
return std_req_stall;
/* Shoot it from the EP buffer */
memcpy(ep->buf, buf, rc);
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:
case USB_DT_DEVICE_QUALIFIER:
case USB_DT_OTHER_SPEED_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;
/*
* We only set USB_PORT_STAT_C_ENABLE if we are disabling
* the port as per USB spec, otherwise MacOS gets upset
*/
if (p->status & USB_PORT_STAT_ENABLE)
chg &= ~USB_PORT_STAT_C_ENABLE;
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 < vhub->max_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 > vhub->max_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 > vhub->max_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 > vhub->max_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);
case ClearTTBuffer:
case ResetTT:
case StopTT:
return std_req_complete;
case GetTTState:
return ast_vhub_simple_reply(ep, 0, 0, 0, 0);
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 < vhub->max_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 < vhub->max_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 < vhub->max_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);
}
static void ast_vhub_of_parse_dev_desc(struct ast_vhub *vhub,
const struct device_node *vhub_np)
{
u16 id;
u32 data;
if (!of_property_read_u32(vhub_np, "vhub-vendor-id", &data)) {
id = (u16)data;
vhub->vhub_dev_desc.idVendor = cpu_to_le16(id);
}
if (!of_property_read_u32(vhub_np, "vhub-product-id", &data)) {
id = (u16)data;
vhub->vhub_dev_desc.idProduct = cpu_to_le16(id);
}
if (!of_property_read_u32(vhub_np, "vhub-device-revision", &data)) {
id = (u16)data;
vhub->vhub_dev_desc.bcdDevice = cpu_to_le16(id);
}
}
static void ast_vhub_fixup_usb1_dev_desc(struct ast_vhub *vhub)
{
vhub->vhub_dev_desc.bcdUSB = cpu_to_le16(0x0100);
vhub->vhub_dev_desc.bDeviceProtocol = 0;
}
static struct usb_gadget_string_container*
ast_vhub_str_container_alloc(struct ast_vhub *vhub)
{
unsigned int size;
struct usb_string *str_array;
struct usb_gadget_strings *lang_str;
struct usb_gadget_string_container *container;
size = sizeof(*container);
size += sizeof(struct usb_gadget_strings);
size += sizeof(struct usb_string) * AST_VHUB_STR_INDEX_MAX;
container = devm_kzalloc(&vhub->pdev->dev, size, GFP_KERNEL);
if (!container)
return ERR_PTR(-ENOMEM);
lang_str = ast_vhub_str_of_container(container);
str_array = (struct usb_string *)(lang_str + 1);
lang_str->strings = str_array;
return container;
}
static void ast_vhub_str_deep_copy(struct usb_gadget_strings *dest,
const struct usb_gadget_strings *src)
{
struct usb_string *src_array = src->strings;
struct usb_string *dest_array = dest->strings;
dest->language = src->language;
if (src_array && dest_array) {
do {
*dest_array = *src_array;
dest_array++;
src_array++;
} while (src_array->s);
}
}
static int ast_vhub_str_alloc_add(struct ast_vhub *vhub,
const struct usb_gadget_strings *src_str)
{
struct usb_gadget_strings *dest_str;
struct usb_gadget_string_container *container;
container = ast_vhub_str_container_alloc(vhub);
if (IS_ERR(container))
return PTR_ERR(container);
dest_str = ast_vhub_str_of_container(container);
ast_vhub_str_deep_copy(dest_str, src_str);
list_add_tail(&container->list, &vhub->vhub_str_desc);
return 0;
}
static const struct {
const char *name;
u8 id;
} str_id_map[] = {
{"manufacturer", AST_VHUB_STR_MANUF},
{"product", AST_VHUB_STR_PRODUCT},
{"serial-number", AST_VHUB_STR_SERIAL},
{},
};
static int ast_vhub_of_parse_str_desc(struct ast_vhub *vhub,
const struct device_node *desc_np)
{
u32 langid;
int ret = 0;
int i, offset;
const char *str;
struct device_node *child;
struct usb_string str_array[AST_VHUB_STR_INDEX_MAX];
struct usb_gadget_strings lang_str = {
.strings = (struct usb_string *)str_array,
};
for_each_child_of_node(desc_np, child) {
if (of_property_read_u32(child, "reg", &langid))
continue; /* no language identifier specified */
if (!usb_validate_langid(langid))
continue; /* invalid language identifier */
lang_str.language = langid;
for (i = offset = 0; str_id_map[i].name; i++) {
str = of_get_property(child, str_id_map[i].name, NULL);
if (str) {
str_array[offset].s = str;
str_array[offset].id = str_id_map[i].id;
offset++;
}
}
str_array[offset].id = 0;
str_array[offset].s = NULL;
ret = ast_vhub_str_alloc_add(vhub, &lang_str);
if (ret) {
of_node_put(child);
break;
}
}
return ret;
}
static int ast_vhub_init_desc(struct ast_vhub *vhub)
{
int ret;
struct device_node *desc_np;
const struct device_node *vhub_np = vhub->pdev->dev.of_node;
/* Initialize vhub Device Descriptor. */
memcpy(&vhub->vhub_dev_desc, &ast_vhub_dev_desc,
sizeof(vhub->vhub_dev_desc));
ast_vhub_of_parse_dev_desc(vhub, vhub_np);
if (vhub->force_usb1)
ast_vhub_fixup_usb1_dev_desc(vhub);
/* Initialize vhub Configuration Descriptor. */
memcpy(&vhub->vhub_conf_desc, &ast_vhub_conf_desc,
sizeof(vhub->vhub_conf_desc));
/* Initialize vhub Hub Descriptor. */
memcpy(&vhub->vhub_hub_desc, &ast_vhub_hub_desc,
sizeof(vhub->vhub_hub_desc));
vhub->vhub_hub_desc.bNbrPorts = vhub->max_ports;
/* Initialize vhub String Descriptors. */
INIT_LIST_HEAD(&vhub->vhub_str_desc);
desc_np = of_get_child_by_name(vhub_np, "vhub-strings");
if (desc_np) {
ret = ast_vhub_of_parse_str_desc(vhub, desc_np);
of_node_put(desc_np);
}
else
ret = ast_vhub_str_alloc_add(vhub, &ast_vhub_strings);
/* Initialize vhub Qualifier Descriptor. */
memcpy(&vhub->vhub_qual_desc, &ast_vhub_qual_desc,
sizeof(vhub->vhub_qual_desc));
return ret;
}
int ast_vhub_init_hub(struct ast_vhub *vhub)
{
vhub->speed = USB_SPEED_UNKNOWN;
INIT_WORK(&vhub->wake_work, ast_vhub_wake_work);
return ast_vhub_init_desc(vhub);
}