coreboot-kgpe-d16/payloads/libpayload/drivers/udc/chipidea.c

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/*
* This file is part of the libpayload project.
*
* Copyright (C) 2015 Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <libpayload.h>
#include <arch/cache.h>
#include <assert.h>
#include <endian.h>
#include <queue.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <usb/usb.h>
#include <udc/udc.h>
#include <udc/chipidea.h>
#include "chipidea_priv.h"
#ifdef DEBUG
#define debug(x...) printf(x)
#else
#define debug(x...) do {} while (0)
#endif
#define min(a, b) (((a) < (b)) ? (a) : (b))
static struct qh *get_qh(struct chipidea_pdata *p, int endpoint, int in_dir)
{
assert(in_dir <= 1);
return &p->qhlist[2 * endpoint + in_dir];
}
static unsigned int ep_to_bits(int ep, int in_dir)
{
return ep + (in_dir ? 16 : 0);
}
static void clear_setup_ep(struct chipidea_pdata *p, int endpoint)
{
writel(1 << endpoint, &p->opreg->epsetupstat);
}
static void clear_ep(struct chipidea_pdata *p, int endpoint, int in_dir)
{
writel(1 << ep_to_bits(endpoint, in_dir), &p->opreg->epcomplete);
}
static int chipidea_hw_init(struct usbdev_ctrl *this, void *_opreg,
const device_descriptor_t *dd)
{
struct chipidea_opreg *opreg = _opreg;
struct chipidea_pdata *p = CI_PDATA(this);
p->opreg = phys_to_virt(opreg);
p->qhlist = dma_memalign(4096, sizeof(struct qh) * CI_QHELEMENTS);
memcpy(&this->device_descriptor, dd, sizeof(*dd));
if (p->qhlist == NULL)
die("failed to allocate memory for USB device mode");
memset(p->qhlist, 0, sizeof(struct qh) * CI_QHELEMENTS);
SLIST_INIT(&this->configs);
int i;
for (i = 0; i < 16; i++) {
SIMPLEQ_INIT(&p->job_queue[i][0]);
SIMPLEQ_INIT(&p->job_queue[i][1]);
}
for (i = 0; i < CI_QHELEMENTS; i++) {
p->qhlist[i].config = QH_MPS(512) | QH_NO_AUTO_ZLT | QH_IOS;
p->qhlist[i].td.next = TD_TERMINATE;
}
/* EP0 in/out are hardwired for SETUP */
p->qhlist[0].config = QH_MPS(64) | QH_NO_AUTO_ZLT | QH_IOS;
p->qhlist[1].config = QH_MPS(64) | QH_NO_AUTO_ZLT | QH_IOS;
do {
debug("waiting for USB phy clk valid: %x\n",
readl(&p->opreg->susp_ctrl));
mdelay(1);
} while ((readl(&p->opreg->susp_ctrl) & (1 << 7)) == 0);
writel(USBCMD_8MICRO | USBCMD_RST, &p->opreg->usbcmd);
mdelay(1);
/* enable device mode */
writel(2, &p->opreg->usbmode);
dcache_clean_by_mva(p->qhlist, sizeof(struct qh) * CI_QHELEMENTS);
writel(virt_to_phys(p->qhlist), &p->opreg->epbase);
writel(0xffffffff, &p->opreg->epflush);
/* enable EP0 */
writel((1 << 23) | (1 << 22) | (1 << 7) | (1 << 6),
&p->opreg->epctrl[0]);
/* clear status register */
writel(readl(&p->opreg->usbsts), &p->opreg->usbsts);
debug("taking controller out of reset\n");
writel(USBCMD_8MICRO | USBCMD_RUN, &p->opreg->usbcmd);
this->stall(this, 0, 0, 0);
this->stall(this, 0, 1, 0);
return 1;
}
static void chipidea_halt_ep(struct usbdev_ctrl *this, int ep, int in_dir)
{
struct chipidea_pdata *p = CI_PDATA(this);
writel(1 << ep_to_bits(ep, in_dir), &p->opreg->epflush);
while (readl(&p->opreg->epflush))
;
clrbits32(&p->opreg->epctrl[ep], 1 << (7 + (in_dir ? 16 : 0)));
while (!SIMPLEQ_EMPTY(&p->job_queue[ep][in_dir])) {
struct job *job = SIMPLEQ_FIRST(&p->job_queue[ep][in_dir]);
if (job->autofree)
free(job->data);
SIMPLEQ_REMOVE_HEAD(&p->job_queue[ep][in_dir], queue);
}
}
static void chipidea_start_ep(struct usbdev_ctrl *this,
int ep, int in_dir, int ep_type, int mps)
{
struct chipidea_pdata *p = CI_PDATA(this);
struct qh *qh = get_qh(p, ep, in_dir);
qh->config = (mps << 16) | QH_NO_AUTO_ZLT | QH_IOS;
dcache_clean_by_mva(qh, sizeof(*qh));
in_dir = in_dir ? 1 : 0;
debug("enabling %d-%d (type %d)\n", ep, in_dir, ep_type);
/* enable endpoint, reset data toggle */
setbits32(&p->opreg->epctrl[ep],
((1 << 7) | (1 << 6) | (ep_type << 2)) << (in_dir*16));
p->ep_busy[ep][in_dir] = 0;
this->ep_mps[ep][in_dir] = mps;
}
static void advance_endpoint(struct chipidea_pdata *p, int endpoint, int in_dir)
{
if (p->ep_busy[endpoint][in_dir])
return;
if (SIMPLEQ_EMPTY(&p->job_queue[endpoint][in_dir]))
return;
struct job *job = SIMPLEQ_FIRST(&p->job_queue[endpoint][in_dir]);
struct qh *qh = get_qh(p, endpoint, in_dir);
uint32_t start = (uint32_t)(uintptr_t)job->data;
uint32_t offset = (start & 0xfff);
/* unlike with typical EHCI controllers,
* a full TD transfers either 0x5000 bytes if
* page aligned or 0x4000 bytes if not.
*/
int maxsize = 0x5000;
if (offset > 0)
maxsize = 0x4000;
uint32_t td_count = (job->length + maxsize - 1) / maxsize;
/* special case for zero length packets */
if (td_count == 0)
td_count = 1;
if (job->zlp)
td_count++;
struct td *tds = dma_memalign(32, sizeof(struct td) * td_count);
memset(tds, 0, sizeof(struct td) * td_count);
int i;
int remaining = job->length;
for (i = 0; i < td_count; i++) {
int datacount = min(maxsize, remaining);
debug("td %d, %d bytes\n", i, datacount);
tds[i].next = (uint32_t)virt_to_phys(&tds[i+1]);
tds[i].info = TD_INFO_LEN(datacount) | TD_INFO_ACTIVE;
tds[i].page0 = start;
tds[i].page1 = (start & 0xfffff000) + 0x1000;
tds[i].page2 = (start & 0xfffff000) + 0x2000;
tds[i].page3 = (start & 0xfffff000) + 0x3000;
tds[i].page4 = (start & 0xfffff000) + 0x4000;
remaining -= datacount;
start = start + datacount;
}
tds[td_count - 1].next = TD_TERMINATE;
tds[td_count - 1].info |= TD_INFO_IOC;
qh->td.next = (uint32_t)virt_to_phys(tds);
qh->td.info = 0;
job->tds = tds;
job->td_count = td_count;
dcache_clean_by_mva(tds, sizeof(struct td) * td_count);
dcache_clean_by_mva(job->data, job->length);
dcache_clean_by_mva(qh, sizeof(*qh));
debug("priming EP %d-%d with %zx bytes starting at %x (%p)\n", endpoint,
in_dir, job->length, tds[0].page0, job->data);
writel(1 << ep_to_bits(endpoint, in_dir), &p->opreg->epprime);
while (readl(&p->opreg->epprime))
;
p->ep_busy[endpoint][in_dir] = 1;
}
static void handle_endpoint(struct usbdev_ctrl *this, int endpoint, int in_dir)
{
struct chipidea_pdata *p = CI_PDATA(this);
struct job *job = SIMPLEQ_FIRST(&p->job_queue[endpoint][in_dir]);
SIMPLEQ_REMOVE_HEAD(&p->job_queue[endpoint][in_dir], queue);
if (in_dir)
dcache_invalidate_by_mva(job->data, job->length);
int length = job->length;
int i = 0;
do {
int active;
do {
dcache_invalidate_by_mva(&job->tds[i],
sizeof(struct td));
active = job->tds[i].info & TD_INFO_ACTIVE;
debug("%d-%d: info %08x, page0 %x, next %x\n",
endpoint, in_dir, job->tds[i].info,
job->tds[i].page0, job->tds[i].next);
} while (active);
/*
* The controller writes back the length field in info
* with the number of bytes it did _not_ process.
* Hence, take the originally scheduled length and
* subtract whatever lengths we still find - that gives
* us the data that the controller did transfer.
*/
int remaining = job->tds[i].info >> 16;
length -= remaining;
} while (job->tds[i++].next != TD_TERMINATE);
debug("%d-%d: scheduled %zd, now %d bytes\n", endpoint, in_dir,
job->length, length);
if (this->current_config &&
this->current_config->interfaces[0].handle_packet)
this->current_config->interfaces[0].handle_packet(this,
endpoint, in_dir, job->data, length);
free(job->tds);
if (job->autofree)
free(job->data);
free(job);
p->ep_busy[endpoint][in_dir] = 0;
advance_endpoint(p, endpoint, in_dir);
}
static void start_setup(struct usbdev_ctrl *this, int ep)
{
dev_req_t dr;
struct chipidea_pdata *p = CI_PDATA(this);
struct qh *qh = get_qh(p, ep, 0);
dcache_invalidate_by_mva(qh, sizeof(*qh));
memcpy(&dr, qh->setup_data, sizeof(qh->setup_data));
clear_setup_ep(p, ep);
#ifdef DEBUG
hexdump((unsigned long)&dr, sizeof(dr));
#endif
udc_handle_setup(this, ep, &dr);
}
static void chipidea_enqueue_packet(struct usbdev_ctrl *this, int endpoint,
int in_dir, void *data, int len, int zlp, int autofree)
{
struct chipidea_pdata *p = CI_PDATA(this);
struct job *job = malloc(sizeof(*job));
job->data = data;
job->length = len;
job->zlp = zlp;
job->autofree = autofree;
debug("adding job of %d bytes to EP %d-%d\n", len, endpoint, in_dir);
SIMPLEQ_INSERT_TAIL(&p->job_queue[endpoint][in_dir], job, queue);
if ((endpoint == 0) || (this->initialized))
advance_endpoint(p, endpoint, in_dir);
}
static int chipidea_poll(struct usbdev_ctrl *this)
{
struct chipidea_pdata *p = CI_PDATA(this);
uint32_t sts = readl(&p->opreg->usbsts);
writel(sts, &p->opreg->usbsts); /* clear */
/* new information if the bus is high speed or not */
if (sts & USBSTS_PCI) {
debug("USB speed negotiation: ");
if ((readl(&p->opreg->devlc) & DEVLC_HOSTSPEED_MASK)
== DEVLC_HOSTSPEED(2)) {
debug("high speed\n");
// TODO: implement
} else {
debug("full speed\n");
// TODO: implement
}
}
/* reset requested. stop all activities */
if (sts & USBSTS_URI) {
int i;
debug("USB reset requested\n");
if (this->initialized) {
writel(readl(&p->opreg->epstat), &p->opreg->epstat);
writel(readl(&p->opreg->epsetupstat),
&p->opreg->epsetupstat);
writel(0xffffffff, &p->opreg->epflush);
for (i = 1; i < 16; i++)
writel(0, &p->opreg->epctrl[i]);
this->initialized = 0;
}
writel((1 << 22) | (1 << 6), &p->opreg->epctrl[0]);
p->qhlist[0].config = QH_MPS(64) | QH_NO_AUTO_ZLT | QH_IOS;
p->qhlist[1].config = QH_MPS(64) | QH_NO_AUTO_ZLT | QH_IOS;
dcache_clean_by_mva(p->qhlist, 2 * sizeof(struct qh));
}
if (sts & (USBSTS_UEI | USBSTS_UI)) {
uint32_t bitmap;
int ep;
/* This slightly deviates from the recommendation in the
* data sheets, but the strict ordering is to simplify
* handling control transfers, which are initialized in
* the third step with a SETUP packet, then proceed in
* the next poll loop with in transfers (either data or
* status phase), then optionally out transfers (status
* phase).
*/
/* in transfers */
bitmap = (readl(&p->opreg->epcomplete) >> 16) & 0xffff;
ep = 0;
while (bitmap) {
if (bitmap & 1) {
debug("incoming packet on EP %d (in)\n", ep);
handle_endpoint(this, ep, 1);
clear_ep(p, ep & 0xf, 1);
}
bitmap >>= 1;
ep++;
}
/* out transfers */
bitmap = readl(&p->opreg->epcomplete) & 0xffff;
ep = 0;
while (bitmap) {
if (bitmap & 1) {
debug("incoming packet on EP %d (out)\n", ep);
handle_endpoint(this, ep, 0);
clear_ep(p, ep, 0);
}
bitmap >>= 1;
ep++;
}
/* setup transfers */
bitmap = readl(&p->opreg->epsetupstat);
ep = 0;
while (bitmap) {
if (bitmap & 1) {
debug("incoming packet on EP %d (setup)\n", ep);
start_setup(this, ep);
}
bitmap >>= 1;
ep++;
}
}
return 1;
}
static void chipidea_force_shutdown(struct usbdev_ctrl *this)
{
struct chipidea_pdata *p = CI_PDATA(this);
writel(0xffffffff, &p->opreg->epflush);
writel(USBCMD_8MICRO | USBCMD_RST, &p->opreg->usbcmd);
writel(0, &p->opreg->usbmode);
writel(USBCMD_8MICRO, &p->opreg->usbcmd);
free(p->qhlist);
free(p);
free(this);
}
static void chipidea_shutdown(struct usbdev_ctrl *this)
{
struct chipidea_pdata *p = CI_PDATA(this);
int i, j;
int is_empty = 0;
while (!is_empty) {
is_empty = 1;
this->poll(this);
for (i = 0; i < 16; i++)
for (j = 0; j < 2; j++)
if (!SIMPLEQ_EMPTY(&p->job_queue[i][j]))
is_empty = 0;
}
chipidea_force_shutdown(this);
}
static void chipidea_set_address(struct usbdev_ctrl *this, int address)
{
struct chipidea_pdata *p = CI_PDATA(this);
writel((address << 25) | (1 << 24), &p->opreg->usbadr);
}
static void chipidea_stall(struct usbdev_ctrl *this,
uint8_t ep, int in_dir, int set)
{
struct chipidea_pdata *p = CI_PDATA(this);
assert(ep < 16);
uint32_t *ctrl = &p->opreg->epctrl[ep];
in_dir = in_dir ? 1 : 0;
if (set) {
if (in_dir)
setbits32(ctrl, 1 << 16);
else
setbits32(ctrl, 1 << 0);
} else {
/* reset STALL bit, reset data toggle */
if (in_dir) {
setbits32(ctrl, 1 << 22);
clrbits32(ctrl, 1 << 16);
} else {
setbits32(ctrl, 1 << 6);
clrbits32(ctrl, 1 << 0);
}
}
this->ep_halted[ep][in_dir] = set;
}
static void *chipidea_malloc(size_t size)
{
return dma_malloc(size);
}
static void chipidea_free(void *ptr)
{
free(ptr);
}
struct usbdev_ctrl *chipidea_init(device_descriptor_t *dd)
{
struct usbdev_ctrl *ctrl = calloc(1, sizeof(*ctrl));
if (ctrl == NULL)
return NULL;
ctrl->pdata = calloc(1, sizeof(struct chipidea_pdata));
if (ctrl->pdata == NULL) {
free(ctrl);
return NULL;
}
ctrl->poll = chipidea_poll;
ctrl->add_gadget = udc_add_gadget;
ctrl->add_strings = udc_add_strings;
ctrl->enqueue_packet = chipidea_enqueue_packet;
ctrl->force_shutdown = chipidea_force_shutdown;
ctrl->shutdown = chipidea_shutdown;
ctrl->set_address = chipidea_set_address;
ctrl->stall = chipidea_stall;
ctrl->halt_ep = chipidea_halt_ep;
ctrl->start_ep = chipidea_start_ep;
ctrl->alloc_data = chipidea_malloc;
ctrl->free_data = chipidea_free;
ctrl->initialized = 0;
int i;
ctrl->ep_mps[0][0] = 64;
ctrl->ep_mps[0][1] = 64;
for (i = 1; i < 16; i++) {
ctrl->ep_mps[i][0] = 512;
ctrl->ep_mps[i][1] = 512;
}
if (!chipidea_hw_init(ctrl, (void *)0x7d000000, dd)) {
free(ctrl->pdata);
free(ctrl);
return NULL;
}
return ctrl;
}