u-boot/drivers/usb/gadget/mv_udc.c

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/*
* Copyright 2011, Marvell Semiconductor Inc.
* Lei Wen <leiwen@marvell.com>
*
* SPDX-License-Identifier: GPL-2.0+
*
* Back ported to the 8xx platform (from the 8260 platform) by
* Murray.Jensen@cmst.csiro.au, 27-Jan-01.
*/
#include <common.h>
#include <command.h>
#include <config.h>
#include <net.h>
#include <malloc.h>
#include <asm/byteorder.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm/unaligned.h>
#include <linux/types.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <usb/mv_udc.h>
#include "../host/ehci.h"
#include "mv_udc.h"
/*
* Check if the system has too long cachelines. If the cachelines are
* longer then 128b, the driver will not be able flush/invalidate data
* cache over separate QH entries. We use 128b because one QH entry is
* 64b long and there are always two QH list entries for each endpoint.
*/
#if ARCH_DMA_MINALIGN > 128
#error This driver can not work on systems with caches longer than 128b
#endif
#ifndef DEBUG
#define DBG(x...) do {} while (0)
#else
#define DBG(x...) printf(x)
static const char *reqname(unsigned r)
{
switch (r) {
case USB_REQ_GET_STATUS: return "GET_STATUS";
case USB_REQ_CLEAR_FEATURE: return "CLEAR_FEATURE";
case USB_REQ_SET_FEATURE: return "SET_FEATURE";
case USB_REQ_SET_ADDRESS: return "SET_ADDRESS";
case USB_REQ_GET_DESCRIPTOR: return "GET_DESCRIPTOR";
case USB_REQ_SET_DESCRIPTOR: return "SET_DESCRIPTOR";
case USB_REQ_GET_CONFIGURATION: return "GET_CONFIGURATION";
case USB_REQ_SET_CONFIGURATION: return "SET_CONFIGURATION";
case USB_REQ_GET_INTERFACE: return "GET_INTERFACE";
case USB_REQ_SET_INTERFACE: return "SET_INTERFACE";
default: return "*UNKNOWN*";
}
}
#endif
static struct usb_endpoint_descriptor ep0_out_desc = {
.bLength = sizeof(struct usb_endpoint_descriptor),
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 0,
.bmAttributes = USB_ENDPOINT_XFER_CONTROL,
};
static struct usb_endpoint_descriptor ep0_in_desc = {
.bLength = sizeof(struct usb_endpoint_descriptor),
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_CONTROL,
};
static int mv_pullup(struct usb_gadget *gadget, int is_on);
static int mv_ep_enable(struct usb_ep *ep,
const struct usb_endpoint_descriptor *desc);
static int mv_ep_disable(struct usb_ep *ep);
static int mv_ep_queue(struct usb_ep *ep,
struct usb_request *req, gfp_t gfp_flags);
static struct usb_request *
mv_ep_alloc_request(struct usb_ep *ep, unsigned int gfp_flags);
static void mv_ep_free_request(struct usb_ep *ep, struct usb_request *_req);
static struct usb_gadget_ops mv_udc_ops = {
.pullup = mv_pullup,
};
static struct usb_ep_ops mv_ep_ops = {
.enable = mv_ep_enable,
.disable = mv_ep_disable,
.queue = mv_ep_queue,
.alloc_request = mv_ep_alloc_request,
.free_request = mv_ep_free_request,
};
/* Init values for USB endpoints. */
static const struct usb_ep mv_ep_init[2] = {
[0] = { /* EP 0 */
.maxpacket = 64,
.name = "ep0",
.ops = &mv_ep_ops,
},
[1] = { /* EP 1..n */
.maxpacket = 512,
.name = "ep-",
.ops = &mv_ep_ops,
},
};
static struct mv_drv controller = {
.gadget = {
.name = "mv_udc",
.ops = &mv_udc_ops,
.is_dualspeed = 1,
},
};
/**
* mv_get_qh() - return queue head for endpoint
* @ep_num: Endpoint number
* @dir_in: Direction of the endpoint (IN = 1, OUT = 0)
*
* This function returns the QH associated with particular endpoint
* and it's direction.
*/
static struct ept_queue_head *mv_get_qh(int ep_num, int dir_in)
{
return &controller.epts[(ep_num * 2) + dir_in];
}
/**
* mv_get_qtd() - return queue item for endpoint
* @ep_num: Endpoint number
* @dir_in: Direction of the endpoint (IN = 1, OUT = 0)
*
* This function returns the QH associated with particular endpoint
* and it's direction.
*/
static struct ept_queue_item *mv_get_qtd(int ep_num, int dir_in)
{
return controller.items[(ep_num * 2) + dir_in];
}
/**
* mv_flush_qh - flush cache over queue head
* @ep_num: Endpoint number
*
* This function flushes cache over QH for particular endpoint.
*/
static void mv_flush_qh(int ep_num)
{
struct ept_queue_head *head = mv_get_qh(ep_num, 0);
const uint32_t start = (uint32_t)head;
const uint32_t end = start + 2 * sizeof(*head);
flush_dcache_range(start, end);
}
/**
* mv_invalidate_qh - invalidate cache over queue head
* @ep_num: Endpoint number
*
* This function invalidates cache over QH for particular endpoint.
*/
static void mv_invalidate_qh(int ep_num)
{
struct ept_queue_head *head = mv_get_qh(ep_num, 0);
uint32_t start = (uint32_t)head;
uint32_t end = start + 2 * sizeof(*head);
invalidate_dcache_range(start, end);
}
/**
* mv_flush_qtd - flush cache over queue item
* @ep_num: Endpoint number
*
* This function flushes cache over qTD pair for particular endpoint.
*/
static void mv_flush_qtd(int ep_num)
{
struct ept_queue_item *item = mv_get_qtd(ep_num, 0);
const uint32_t start = (uint32_t)item;
const uint32_t end_raw = start + 2 * sizeof(*item);
const uint32_t end = roundup(end_raw, ARCH_DMA_MINALIGN);
flush_dcache_range(start, end);
}
/**
* mv_invalidate_qtd - invalidate cache over queue item
* @ep_num: Endpoint number
*
* This function invalidates cache over qTD pair for particular endpoint.
*/
static void mv_invalidate_qtd(int ep_num)
{
struct ept_queue_item *item = mv_get_qtd(ep_num, 0);
const uint32_t start = (uint32_t)item;
const uint32_t end_raw = start + 2 * sizeof(*item);
const uint32_t end = roundup(end_raw, ARCH_DMA_MINALIGN);
invalidate_dcache_range(start, end);
}
static struct usb_request *
mv_ep_alloc_request(struct usb_ep *ep, unsigned int gfp_flags)
{
struct mv_ep *mv_ep = container_of(ep, struct mv_ep, ep);
return &mv_ep->req;
}
static void mv_ep_free_request(struct usb_ep *ep, struct usb_request *_req)
{
return;
}
static void ep_enable(int num, int in, int maxpacket)
{
struct mv_udc *udc = (struct mv_udc *)controller.ctrl->hcor;
unsigned n;
n = readl(&udc->epctrl[num]);
if (in)
n |= (CTRL_TXE | CTRL_TXR | CTRL_TXT_BULK);
else
n |= (CTRL_RXE | CTRL_RXR | CTRL_RXT_BULK);
if (num != 0) {
struct ept_queue_head *head = mv_get_qh(num, in);
head->config = CONFIG_MAX_PKT(maxpacket) | CONFIG_ZLT;
mv_flush_qh(num);
}
writel(n, &udc->epctrl[num]);
}
static int mv_ep_enable(struct usb_ep *ep,
const struct usb_endpoint_descriptor *desc)
{
struct mv_ep *mv_ep = container_of(ep, struct mv_ep, ep);
int num, in;
num = desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
in = (desc->bEndpointAddress & USB_DIR_IN) != 0;
mv_ep->desc = desc;
if (num) {
int max = get_unaligned_le16(&desc->wMaxPacketSize);
if ((max > 64) && (controller.gadget.speed == USB_SPEED_FULL))
max = 64;
if (ep->maxpacket != max) {
DBG("%s: from %d to %d\n", __func__,
ep->maxpacket, max);
ep->maxpacket = max;
}
}
ep_enable(num, in, ep->maxpacket);
DBG("%s: num=%d maxpacket=%d\n", __func__, num, ep->maxpacket);
return 0;
}
static int mv_ep_disable(struct usb_ep *ep)
{
struct mv_ep *mv_ep = container_of(ep, struct mv_ep, ep);
mv_ep->desc = NULL;
return 0;
}
static int mv_bounce(struct mv_ep *ep, int in)
{
uint32_t addr = (uint32_t)ep->req.buf;
uint32_t ba;
/* Input buffer address is not aligned. */
if (addr & (ARCH_DMA_MINALIGN - 1))
goto align;
/* Input buffer length is not aligned. */
if (ep->req.length & (ARCH_DMA_MINALIGN - 1))
goto align;
/* The buffer is well aligned, only flush cache. */
ep->b_len = ep->req.length;
ep->b_buf = ep->req.buf;
goto flush;
align:
/* Use internal buffer for small payloads. */
if (ep->req.length <= 64) {
ep->b_len = 64;
ep->b_buf = ep->b_fast;
} else {
ep->b_len = roundup(ep->req.length, ARCH_DMA_MINALIGN);
ep->b_buf = memalign(ARCH_DMA_MINALIGN, ep->b_len);
if (!ep->b_buf)
return -ENOMEM;
}
if (in)
memcpy(ep->b_buf, ep->req.buf, ep->req.length);
flush:
ba = (uint32_t)ep->b_buf;
flush_dcache_range(ba, ba + ep->b_len);
return 0;
}
static void mv_debounce(struct mv_ep *ep, int in)
{
uint32_t addr = (uint32_t)ep->req.buf;
uint32_t ba = (uint32_t)ep->b_buf;
if (in) {
if (addr == ba)
return; /* not a bounce */
goto free;
}
invalidate_dcache_range(ba, ba + ep->b_len);
if (addr == ba)
return; /* not a bounce */
memcpy(ep->req.buf, ep->b_buf, ep->req.length);
free:
/* Large payloads use allocated buffer, free it. */
if (ep->b_buf != ep->b_fast)
free(ep->b_buf);
}
static int mv_ep_queue(struct usb_ep *ep,
struct usb_request *req, gfp_t gfp_flags)
{
struct mv_ep *mv_ep = container_of(ep, struct mv_ep, ep);
struct mv_udc *udc = (struct mv_udc *)controller.ctrl->hcor;
struct ept_queue_item *item;
struct ept_queue_head *head;
int bit, num, len, in, ret;
num = mv_ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
in = (mv_ep->desc->bEndpointAddress & USB_DIR_IN) != 0;
item = mv_get_qtd(num, in);
head = mv_get_qh(num, in);
len = req->length;
ret = mv_bounce(mv_ep, in);
if (ret)
return ret;
item->next = TERMINATE;
item->info = INFO_BYTES(len) | INFO_IOC | INFO_ACTIVE;
item->page0 = (uint32_t)mv_ep->b_buf;
item->page1 = ((uint32_t)mv_ep->b_buf & 0xfffff000) + 0x1000;
mv_flush_qtd(num);
head->next = (unsigned) item;
head->info = 0;
DBG("ept%d %s queue len %x, buffer %p\n",
num, in ? "in" : "out", len, mv_ep->b_buf);
mv_flush_qh(num);
if (in)
bit = EPT_TX(num);
else
bit = EPT_RX(num);
writel(bit, &udc->epprime);
return 0;
}
static void handle_ep_complete(struct mv_ep *ep)
{
struct ept_queue_item *item;
int num, in, len;
num = ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
in = (ep->desc->bEndpointAddress & USB_DIR_IN) != 0;
if (num == 0)
ep->desc = &ep0_out_desc;
item = mv_get_qtd(num, in);
mv_invalidate_qtd(num);
if (item->info & 0xff)
printf("EP%d/%s FAIL info=%x pg0=%x\n",
num, in ? "in" : "out", item->info, item->page0);
len = (item->info >> 16) & 0x7fff;
ep->req.length -= len;
mv_debounce(ep, in);
DBG("ept%d %s complete %x\n",
num, in ? "in" : "out", len);
ep->req.complete(&ep->ep, &ep->req);
if (num == 0) {
ep->req.length = 0;
usb_ep_queue(&ep->ep, &ep->req, 0);
ep->desc = &ep0_in_desc;
}
}
#define SETUP(type, request) (((type) << 8) | (request))
static void handle_setup(void)
{
struct usb_request *req = &controller.ep[0].req;
struct mv_udc *udc = (struct mv_udc *)controller.ctrl->hcor;
struct ept_queue_head *head;
struct usb_ctrlrequest r;
int status = 0;
int num, in, _num, _in, i;
char *buf;
head = mv_get_qh(0, 0); /* EP0 OUT */
mv_invalidate_qh(0);
memcpy(&r, head->setup_data, sizeof(struct usb_ctrlrequest));
writel(EPT_RX(0), &udc->epstat);
DBG("handle setup %s, %x, %x index %x value %x\n", reqname(r.bRequest),
r.bRequestType, r.bRequest, r.wIndex, r.wValue);
switch (SETUP(r.bRequestType, r.bRequest)) {
case SETUP(USB_RECIP_ENDPOINT, USB_REQ_CLEAR_FEATURE):
_num = r.wIndex & 15;
_in = !!(r.wIndex & 0x80);
if ((r.wValue == 0) && (r.wLength == 0)) {
req->length = 0;
for (i = 0; i < NUM_ENDPOINTS; i++) {
struct mv_ep *ep = &controller.ep[i];
if (!ep->desc)
continue;
num = ep->desc->bEndpointAddress
& USB_ENDPOINT_NUMBER_MASK;
in = (ep->desc->bEndpointAddress
& USB_DIR_IN) != 0;
if ((num == _num) && (in == _in)) {
ep_enable(num, in, ep->ep.maxpacket);
usb_ep_queue(controller.gadget.ep0,
req, 0);
break;
}
}
}
return;
case SETUP(USB_RECIP_DEVICE, USB_REQ_SET_ADDRESS):
/*
* write address delayed (will take effect
* after the next IN txn)
*/
writel((r.wValue << 25) | (1 << 24), &udc->devaddr);
req->length = 0;
usb_ep_queue(controller.gadget.ep0, req, 0);
return;
case SETUP(USB_DIR_IN | USB_RECIP_DEVICE, USB_REQ_GET_STATUS):
req->length = 2;
buf = (char *)req->buf;
buf[0] = 1 << USB_DEVICE_SELF_POWERED;
buf[1] = 0;
usb_ep_queue(controller.gadget.ep0, req, 0);
return;
}
/* pass request up to the gadget driver */
if (controller.driver)
status = controller.driver->setup(&controller.gadget, &r);
else
status = -ENODEV;
if (!status)
return;
DBG("STALL reqname %s type %x value %x, index %x\n",
reqname(r.bRequest), r.bRequestType, r.wValue, r.wIndex);
writel((1<<16) | (1 << 0), &udc->epctrl[0]);
}
static void stop_activity(void)
{
int i, num, in;
struct ept_queue_head *head;
struct mv_udc *udc = (struct mv_udc *)controller.ctrl->hcor;
writel(readl(&udc->epcomp), &udc->epcomp);
writel(readl(&udc->epstat), &udc->epstat);
writel(0xffffffff, &udc->epflush);
/* error out any pending reqs */
for (i = 0; i < NUM_ENDPOINTS; i++) {
if (i != 0)
writel(0, &udc->epctrl[i]);
if (controller.ep[i].desc) {
num = controller.ep[i].desc->bEndpointAddress
& USB_ENDPOINT_NUMBER_MASK;
in = (controller.ep[i].desc->bEndpointAddress
& USB_DIR_IN) != 0;
head = mv_get_qh(num, in);
head->info = INFO_ACTIVE;
mv_flush_qh(num);
}
}
}
void udc_irq(void)
{
struct mv_udc *udc = (struct mv_udc *)controller.ctrl->hcor;
unsigned n = readl(&udc->usbsts);
writel(n, &udc->usbsts);
int bit, i, num, in;
n &= (STS_SLI | STS_URI | STS_PCI | STS_UI | STS_UEI);
if (n == 0)
return;
if (n & STS_URI) {
DBG("-- reset --\n");
stop_activity();
}
if (n & STS_SLI)
DBG("-- suspend --\n");
if (n & STS_PCI) {
int max = 64;
int speed = USB_SPEED_FULL;
bit = (readl(&udc->portsc) >> 26) & 3;
DBG("-- portchange %x %s\n", bit, (bit == 2) ? "High" : "Full");
if (bit == 2) {
speed = USB_SPEED_HIGH;
max = 512;
}
controller.gadget.speed = speed;
for (i = 1; i < NUM_ENDPOINTS; i++) {
if (controller.ep[i].ep.maxpacket > max)
controller.ep[i].ep.maxpacket = max;
}
}
if (n & STS_UEI)
printf("<UEI %x>\n", readl(&udc->epcomp));
if ((n & STS_UI) || (n & STS_UEI)) {
n = readl(&udc->epstat);
if (n & EPT_RX(0))
handle_setup();
n = readl(&udc->epcomp);
if (n != 0)
writel(n, &udc->epcomp);
for (i = 0; i < NUM_ENDPOINTS && n; i++) {
if (controller.ep[i].desc) {
num = controller.ep[i].desc->bEndpointAddress
& USB_ENDPOINT_NUMBER_MASK;
in = (controller.ep[i].desc->bEndpointAddress
& USB_DIR_IN) != 0;
bit = (in) ? EPT_TX(num) : EPT_RX(num);
if (n & bit)
handle_ep_complete(&controller.ep[i]);
}
}
}
}
int usb_gadget_handle_interrupts(void)
{
u32 value;
struct mv_udc *udc = (struct mv_udc *)controller.ctrl->hcor;
value = readl(&udc->usbsts);
if (value)
udc_irq();
return value;
}
static int mv_pullup(struct usb_gadget *gadget, int is_on)
{
struct mv_udc *udc = (struct mv_udc *)controller.ctrl->hcor;
if (is_on) {
/* RESET */
writel(USBCMD_ITC(MICRO_8FRAME) | USBCMD_RST, &udc->usbcmd);
udelay(200);
writel((unsigned)controller.epts, &udc->epinitaddr);
/* select DEVICE mode */
writel(USBMODE_DEVICE, &udc->usbmode);
writel(0xffffffff, &udc->epflush);
/* Turn on the USB connection by enabling the pullup resistor */
writel(USBCMD_ITC(MICRO_8FRAME) | USBCMD_RUN, &udc->usbcmd);
} else {
stop_activity();
writel(USBCMD_FS2, &udc->usbcmd);
udelay(800);
if (controller.driver)
controller.driver->disconnect(gadget);
}
return 0;
}
void udc_disconnect(void)
{
struct mv_udc *udc = (struct mv_udc *)controller.ctrl->hcor;
/* disable pullup */
stop_activity();
writel(USBCMD_FS2, &udc->usbcmd);
udelay(800);
if (controller.driver)
controller.driver->disconnect(&controller.gadget);
}
static int mvudc_probe(void)
{
struct ept_queue_head *head;
uint8_t *imem;
int i;
const int num = 2 * NUM_ENDPOINTS;
const int eplist_min_align = 4096;
const int eplist_align = roundup(eplist_min_align, ARCH_DMA_MINALIGN);
const int eplist_raw_sz = num * sizeof(struct ept_queue_head);
const int eplist_sz = roundup(eplist_raw_sz, ARCH_DMA_MINALIGN);
const int ilist_align = roundup(ARCH_DMA_MINALIGN, 32);
const int ilist_ent_raw_sz = 2 * sizeof(struct ept_queue_item);
const int ilist_ent_sz = roundup(ilist_ent_raw_sz, ARCH_DMA_MINALIGN);
const int ilist_sz = NUM_ENDPOINTS * ilist_ent_sz;
/* The QH list must be aligned to 4096 bytes. */
controller.epts = memalign(eplist_align, eplist_sz);
if (!controller.epts)
return -ENOMEM;
memset(controller.epts, 0, eplist_sz);
/*
* Each qTD item must be 32-byte aligned, each qTD touple must be
* cacheline aligned. There are two qTD items for each endpoint and
* only one of them is used for the endpoint at time, so we can group
* them together.
*/
controller.items_mem = memalign(ilist_align, ilist_sz);
if (!controller.items_mem) {
free(controller.epts);
return -ENOMEM;
}
memset(controller.items_mem, 0, ilist_sz);
for (i = 0; i < 2 * NUM_ENDPOINTS; i++) {
/*
* Configure QH for each endpoint. The structure of the QH list
* is such that each two subsequent fields, N and N+1 where N is
* even, in the QH list represent QH for one endpoint. The Nth
* entry represents OUT configuration and the N+1th entry does
* represent IN configuration of the endpoint.
*/
head = controller.epts + i;
if (i < 2)
head->config = CONFIG_MAX_PKT(EP0_MAX_PACKET_SIZE)
| CONFIG_ZLT | CONFIG_IOS;
else
head->config = CONFIG_MAX_PKT(EP_MAX_PACKET_SIZE)
| CONFIG_ZLT;
head->next = TERMINATE;
head->info = 0;
imem = controller.items_mem + ((i >> 1) * ilist_ent_sz);
if (i & 1)
imem += sizeof(struct ept_queue_item);
controller.items[i] = (struct ept_queue_item *)imem;
if (i & 1) {
mv_flush_qh(i - 1);
mv_flush_qtd(i - 1);
}
}
INIT_LIST_HEAD(&controller.gadget.ep_list);
/* Init EP 0 */
memcpy(&controller.ep[0].ep, &mv_ep_init[0], sizeof(*mv_ep_init));
controller.ep[0].desc = &ep0_in_desc;
controller.gadget.ep0 = &controller.ep[0].ep;
INIT_LIST_HEAD(&controller.gadget.ep0->ep_list);
/* Init EP 1..n */
for (i = 1; i < NUM_ENDPOINTS; i++) {
memcpy(&controller.ep[i].ep, &mv_ep_init[1],
sizeof(*mv_ep_init));
list_add_tail(&controller.ep[i].ep.ep_list,
&controller.gadget.ep_list);
}
return 0;
}
int usb_gadget_register_driver(struct usb_gadget_driver *driver)
{
struct mv_udc *udc;
int ret;
if (!driver)
return -EINVAL;
if (!driver->bind || !driver->setup || !driver->disconnect)
return -EINVAL;
if (driver->speed != USB_SPEED_FULL && driver->speed != USB_SPEED_HIGH)
return -EINVAL;
ret = usb_lowlevel_init(0, USB_INIT_DEVICE, (void **)&controller.ctrl);
if (ret)
return ret;
ret = mvudc_probe();
if (!ret) {
udc = (struct mv_udc *)controller.ctrl->hcor;
/* select ULPI phy */
writel(PTS(PTS_ENABLE) | PFSC, &udc->portsc);
}
ret = driver->bind(&controller.gadget);
if (ret) {
DBG("driver->bind() returned %d\n", ret);
return ret;
}
controller.driver = driver;
return 0;
}
int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
{
return 0;
}