blob: fc27dbe8de4996e6488adf0b436cf2d036317cc1 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2008 - 2009
* Windriver, <www.windriver.com>
* Tom Rix <Tom.Rix@windriver.com>
*
* Copyright 2011 Sebastian Andrzej Siewior <bigeasy@linutronix.de>
*
* Copyright 2014 Linaro, Ltd.
* Rob Herring <robh@kernel.org>
*/
#include <config.h>
#include <common.h>
#include <env.h>
#include <errno.h>
#include <fastboot.h>
#include <malloc.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/composite.h>
#include <linux/compiler.h>
#include <g_dnl.h>
#define FASTBOOT_INTERFACE_CLASS 0xff
#define FASTBOOT_INTERFACE_SUB_CLASS 0x42
#define FASTBOOT_INTERFACE_PROTOCOL 0x03
#define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_2_0 (0x0200)
#define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_1_1 (0x0040)
#define TX_ENDPOINT_MAXIMUM_PACKET_SIZE (0x0040)
#define EP_BUFFER_SIZE 4096
/*
* EP_BUFFER_SIZE must always be an integral multiple of maxpacket size
* (64 or 512 or 1024), else we break on certain controllers like DWC3
* that expect bulk OUT requests to be divisible by maxpacket size.
*/
struct f_fastboot {
struct usb_function usb_function;
/* IN/OUT EP's and corresponding requests */
struct usb_ep *in_ep, *out_ep;
struct usb_request *in_req, *out_req;
};
static inline struct f_fastboot *func_to_fastboot(struct usb_function *f)
{
return container_of(f, struct f_fastboot, usb_function);
}
static struct f_fastboot *fastboot_func;
static struct usb_endpoint_descriptor fs_ep_in = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(64),
};
static struct usb_endpoint_descriptor fs_ep_out = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(64),
};
static struct usb_endpoint_descriptor hs_ep_in = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
};
static struct usb_endpoint_descriptor hs_ep_out = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
};
static struct usb_interface_descriptor interface_desc = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 0x00,
.bAlternateSetting = 0x00,
.bNumEndpoints = 0x02,
.bInterfaceClass = FASTBOOT_INTERFACE_CLASS,
.bInterfaceSubClass = FASTBOOT_INTERFACE_SUB_CLASS,
.bInterfaceProtocol = FASTBOOT_INTERFACE_PROTOCOL,
};
static struct usb_descriptor_header *fb_fs_function[] = {
(struct usb_descriptor_header *)&interface_desc,
(struct usb_descriptor_header *)&fs_ep_in,
(struct usb_descriptor_header *)&fs_ep_out,
};
static struct usb_descriptor_header *fb_hs_function[] = {
(struct usb_descriptor_header *)&interface_desc,
(struct usb_descriptor_header *)&hs_ep_in,
(struct usb_descriptor_header *)&hs_ep_out,
NULL,
};
static struct usb_endpoint_descriptor *
fb_ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs,
struct usb_endpoint_descriptor *hs)
{
if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
return hs;
return fs;
}
/*
* static strings, in UTF-8
*/
static const char fastboot_name[] = "Android Fastboot";
static struct usb_string fastboot_string_defs[] = {
[0].s = fastboot_name,
{ } /* end of list */
};
static struct usb_gadget_strings stringtab_fastboot = {
.language = 0x0409, /* en-us */
.strings = fastboot_string_defs,
};
static struct usb_gadget_strings *fastboot_strings[] = {
&stringtab_fastboot,
NULL,
};
static void rx_handler_command(struct usb_ep *ep, struct usb_request *req);
static void fastboot_complete(struct usb_ep *ep, struct usb_request *req)
{
int status = req->status;
if (!status)
return;
printf("status: %d ep '%s' trans: %d\n", status, ep->name, req->actual);
}
static int fastboot_bind(struct usb_configuration *c, struct usb_function *f)
{
int id;
struct usb_gadget *gadget = c->cdev->gadget;
struct f_fastboot *f_fb = func_to_fastboot(f);
const char *s;
/* DYNAMIC interface numbers assignments */
id = usb_interface_id(c, f);
if (id < 0)
return id;
interface_desc.bInterfaceNumber = id;
id = usb_string_id(c->cdev);
if (id < 0)
return id;
fastboot_string_defs[0].id = id;
interface_desc.iInterface = id;
f_fb->in_ep = usb_ep_autoconfig(gadget, &fs_ep_in);
if (!f_fb->in_ep)
return -ENODEV;
f_fb->in_ep->driver_data = c->cdev;
f_fb->out_ep = usb_ep_autoconfig(gadget, &fs_ep_out);
if (!f_fb->out_ep)
return -ENODEV;
f_fb->out_ep->driver_data = c->cdev;
f->descriptors = fb_fs_function;
if (gadget_is_dualspeed(gadget)) {
/* Assume endpoint addresses are the same for both speeds */
hs_ep_in.bEndpointAddress = fs_ep_in.bEndpointAddress;
hs_ep_out.bEndpointAddress = fs_ep_out.bEndpointAddress;
/* copy HS descriptors */
f->hs_descriptors = fb_hs_function;
}
s = env_get("serial#");
if (s)
g_dnl_set_serialnumber((char *)s);
return 0;
}
static void fastboot_unbind(struct usb_configuration *c, struct usb_function *f)
{
memset(fastboot_func, 0, sizeof(*fastboot_func));
}
static void fastboot_disable(struct usb_function *f)
{
struct f_fastboot *f_fb = func_to_fastboot(f);
usb_ep_disable(f_fb->out_ep);
usb_ep_disable(f_fb->in_ep);
if (f_fb->out_req) {
free(f_fb->out_req->buf);
usb_ep_free_request(f_fb->out_ep, f_fb->out_req);
f_fb->out_req = NULL;
}
if (f_fb->in_req) {
free(f_fb->in_req->buf);
usb_ep_free_request(f_fb->in_ep, f_fb->in_req);
f_fb->in_req = NULL;
}
}
static struct usb_request *fastboot_start_ep(struct usb_ep *ep)
{
struct usb_request *req;
req = usb_ep_alloc_request(ep, 0);
if (!req)
return NULL;
req->length = EP_BUFFER_SIZE;
req->buf = memalign(CONFIG_SYS_CACHELINE_SIZE, EP_BUFFER_SIZE);
if (!req->buf) {
usb_ep_free_request(ep, req);
return NULL;
}
memset(req->buf, 0, req->length);
return req;
}
static int fastboot_set_alt(struct usb_function *f,
unsigned interface, unsigned alt)
{
int ret;
struct usb_composite_dev *cdev = f->config->cdev;
struct usb_gadget *gadget = cdev->gadget;
struct f_fastboot *f_fb = func_to_fastboot(f);
const struct usb_endpoint_descriptor *d;
debug("%s: func: %s intf: %d alt: %d\n",
__func__, f->name, interface, alt);
d = fb_ep_desc(gadget, &fs_ep_out, &hs_ep_out);
ret = usb_ep_enable(f_fb->out_ep, d);
if (ret) {
puts("failed to enable out ep\n");
return ret;
}
f_fb->out_req = fastboot_start_ep(f_fb->out_ep);
if (!f_fb->out_req) {
puts("failed to alloc out req\n");
ret = -EINVAL;
goto err;
}
f_fb->out_req->complete = rx_handler_command;
d = fb_ep_desc(gadget, &fs_ep_in, &hs_ep_in);
ret = usb_ep_enable(f_fb->in_ep, d);
if (ret) {
puts("failed to enable in ep\n");
goto err;
}
f_fb->in_req = fastboot_start_ep(f_fb->in_ep);
if (!f_fb->in_req) {
puts("failed alloc req in\n");
ret = -EINVAL;
goto err;
}
f_fb->in_req->complete = fastboot_complete;
ret = usb_ep_queue(f_fb->out_ep, f_fb->out_req, 0);
if (ret)
goto err;
return 0;
err:
fastboot_disable(f);
return ret;
}
static int fastboot_add(struct usb_configuration *c)
{
struct f_fastboot *f_fb = fastboot_func;
int status;
debug("%s: cdev: 0x%p\n", __func__, c->cdev);
if (!f_fb) {
f_fb = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*f_fb));
if (!f_fb)
return -ENOMEM;
fastboot_func = f_fb;
memset(f_fb, 0, sizeof(*f_fb));
}
f_fb->usb_function.name = "f_fastboot";
f_fb->usb_function.bind = fastboot_bind;
f_fb->usb_function.unbind = fastboot_unbind;
f_fb->usb_function.set_alt = fastboot_set_alt;
f_fb->usb_function.disable = fastboot_disable;
f_fb->usb_function.strings = fastboot_strings;
status = usb_add_function(c, &f_fb->usb_function);
if (status) {
free(f_fb);
fastboot_func = f_fb;
}
return status;
}
DECLARE_GADGET_BIND_CALLBACK(usb_dnl_fastboot, fastboot_add);
static int fastboot_tx_write(const char *buffer, unsigned int buffer_size)
{
struct usb_request *in_req = fastboot_func->in_req;
int ret;
memcpy(in_req->buf, buffer, buffer_size);
in_req->length = buffer_size;
usb_ep_dequeue(fastboot_func->in_ep, in_req);
ret = usb_ep_queue(fastboot_func->in_ep, in_req, 0);
if (ret)
printf("Error %d on queue\n", ret);
return 0;
}
static int fastboot_tx_write_str(const char *buffer)
{
return fastboot_tx_write(buffer, strlen(buffer));
}
static void compl_do_reset(struct usb_ep *ep, struct usb_request *req)
{
do_reset(NULL, 0, 0, NULL);
}
static unsigned int rx_bytes_expected(struct usb_ep *ep)
{
int rx_remain = fastboot_data_remaining();
unsigned int rem;
unsigned int maxpacket = ep->maxpacket;
if (rx_remain <= 0)
return 0;
else if (rx_remain > EP_BUFFER_SIZE)
return EP_BUFFER_SIZE;
/*
* Some controllers e.g. DWC3 don't like OUT transfers to be
* not ending in maxpacket boundary. So just make them happy by
* always requesting for integral multiple of maxpackets.
* This shouldn't bother controllers that don't care about it.
*/
rem = rx_remain % maxpacket;
if (rem > 0)
rx_remain = rx_remain + (maxpacket - rem);
return rx_remain;
}
static void rx_handler_dl_image(struct usb_ep *ep, struct usb_request *req)
{
char response[FASTBOOT_RESPONSE_LEN] = {0};
unsigned int transfer_size = fastboot_data_remaining();
const unsigned char *buffer = req->buf;
unsigned int buffer_size = req->actual;
if (req->status != 0) {
printf("Bad status: %d\n", req->status);
return;
}
if (buffer_size < transfer_size)
transfer_size = buffer_size;
fastboot_data_download(buffer, transfer_size, response);
if (response[0]) {
fastboot_tx_write_str(response);
} else if (!fastboot_data_remaining()) {
fastboot_data_complete(response);
/*
* Reset global transfer variable
*/
req->complete = rx_handler_command;
req->length = EP_BUFFER_SIZE;
fastboot_tx_write_str(response);
} else {
req->length = rx_bytes_expected(ep);
}
req->actual = 0;
usb_ep_queue(ep, req, 0);
}
static void do_exit_on_complete(struct usb_ep *ep, struct usb_request *req)
{
g_dnl_trigger_detach();
}
static void do_bootm_on_complete(struct usb_ep *ep, struct usb_request *req)
{
fastboot_boot();
do_exit_on_complete(ep, req);
}
static void rx_handler_command(struct usb_ep *ep, struct usb_request *req)
{
char *cmdbuf = req->buf;
char response[FASTBOOT_RESPONSE_LEN] = {0};
int cmd = -1;
if (req->status != 0 || req->length == 0)
return;
if (req->actual < req->length) {
cmdbuf[req->actual] = '\0';
cmd = fastboot_handle_command(cmdbuf, response);
} else {
pr_err("buffer overflow");
fastboot_fail("buffer overflow", response);
}
if (!strncmp("DATA", response, 4)) {
req->complete = rx_handler_dl_image;
req->length = rx_bytes_expected(ep);
}
fastboot_tx_write_str(response);
if (!strncmp("OKAY", response, 4)) {
switch (cmd) {
case FASTBOOT_COMMAND_BOOT:
fastboot_func->in_req->complete = do_bootm_on_complete;
break;
case FASTBOOT_COMMAND_CONTINUE:
fastboot_func->in_req->complete = do_exit_on_complete;
break;
case FASTBOOT_COMMAND_REBOOT:
case FASTBOOT_COMMAND_REBOOT_BOOTLOADER:
fastboot_func->in_req->complete = compl_do_reset;
break;
}
}
*cmdbuf = '\0';
req->actual = 0;
usb_ep_queue(ep, req, 0);
}