GNUBoot
/
coreboot-kgpe-d16
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
coreboot-kgpe-d16/src/lib/usbdebug_direct.c

540 lines
13 KiB
C
Raw Blame History

/*
* Copyright (C) 2006 Eric Biederman (ebiederm@xmission.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* 2006.12.10 yhlu moved it to corbeoot and use struct instead
*/
#ifndef __ROMCC__
#include <console/console.h>
#else
#if CONFIG_USE_PRINTK_IN_CAR==0
#define printk_debug(fmt, arg...) do {} while(0)
#endif
#endif
#include <arch/io.h>
#include <usb_ch9.h>
#include <ehci.h>
#include <usbdebug_direct.h>
#define USB_DEBUG_DEVNUM 127
#define DBGP_DATA_TOGGLE 0x8800
#define DBGP_PID_UPDATE(x, tok) \
((((x) ^ DBGP_DATA_TOGGLE) & 0xffff00) | ((tok) & 0xff))
#define DBGP_LEN_UPDATE(x, len) (((x) & ~0x0f) | ((len) & 0x0f))
/*
* USB Packet IDs (PIDs)
*/
/* token */
#define USB_PID_OUT 0xe1
#define USB_PID_IN 0x69
#define USB_PID_SOF 0xa5
#define USB_PID_SETUP 0x2d
/* handshake */
#define USB_PID_ACK 0xd2
#define USB_PID_NAK 0x5a
#define USB_PID_STALL 0x1e
#define USB_PID_NYET 0x96
/* data */
#define USB_PID_DATA0 0xc3
#define USB_PID_DATA1 0x4b
#define USB_PID_DATA2 0x87
#define USB_PID_MDATA 0x0f
/* Special */
#define USB_PID_PREAMBLE 0x3c
#define USB_PID_ERR 0x3c
#define USB_PID_SPLIT 0x78
#define USB_PID_PING 0xb4
#define USB_PID_UNDEF_0 0xf0
#define USB_PID_DATA_TOGGLE 0x88
#define DBGP_CLAIM (DBGP_OWNER | DBGP_ENABLED | DBGP_INUSE)
#define PCI_CAP_ID_EHCI_DEBUG 0xa
#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
#define HUB_SHORT_RESET_TIME 10
#define HUB_LONG_RESET_TIME 200
#define HUB_RESET_TIMEOUT 500
#define DBGP_MAX_PACKET 8
static int dbgp_wait_until_complete(struct ehci_dbg_port *ehci_debug)
{
unsigned ctrl;
int loop = 0x100000;
do {
ctrl = readl(&ehci_debug->control);
/* Stop when the transaction is finished */
if (ctrl & DBGP_DONE)
break;
} while(--loop>0);
if (!loop) return -1000;
/* Now that we have observed the completed transaction,
* clear the done bit.
*/
writel(ctrl | DBGP_DONE, &ehci_debug->control);
return (ctrl & DBGP_ERROR) ? -DBGP_ERRCODE(ctrl) : DBGP_LEN(ctrl);
}
static void dbgp_mdelay(int ms)
{
int i;
while (ms--) {
for (i = 0; i < 1000; i++)
outb(0x1, 0x80);
}
}
static void dbgp_breath(void)
{
/* Sleep to give the debug port a chance to breathe */
}
static int dbgp_wait_until_done(struct ehci_dbg_port *ehci_debug, unsigned ctrl)
{
unsigned pids, lpid;
int ret;
int loop = 3;
retry:
writel(ctrl | DBGP_GO, &ehci_debug->control);
ret = dbgp_wait_until_complete(ehci_debug);
pids = readl(&ehci_debug->pids);
lpid = DBGP_PID_GET(pids);
if (ret < 0)
return ret;
/* If the port is getting full or it has dropped data
* start pacing ourselves, not necessary but it's friendly.
*/
if ((lpid == USB_PID_NAK) || (lpid == USB_PID_NYET))
dbgp_breath();
/* If I get a NACK reissue the transmission */
if (lpid == USB_PID_NAK) {
if (--loop > 0) goto retry;
}
return ret;
}
static void dbgp_set_data(struct ehci_dbg_port *ehci_debug, const void *buf, int size)
{
const unsigned char *bytes = buf;
unsigned lo, hi;
int i;
lo = hi = 0;
for (i = 0; i < 4 && i < size; i++)
lo |= bytes[i] << (8*i);
for (; i < 8 && i < size; i++)
hi |= bytes[i] << (8*(i - 4));
writel(lo, &ehci_debug->data03);
writel(hi, &ehci_debug->data47);
}
static void dbgp_get_data(struct ehci_dbg_port *ehci_debug, void *buf, int size)
{
unsigned char *bytes = buf;
unsigned lo, hi;
int i;
lo = readl(&ehci_debug->data03);
hi = readl(&ehci_debug->data47);
for (i = 0; i < 4 && i < size; i++)
bytes[i] = (lo >> (8*i)) & 0xff;
for (; i < 8 && i < size; i++)
bytes[i] = (hi >> (8*(i - 4))) & 0xff;
}
static int dbgp_bulk_write(struct ehci_dbg_port *ehci_debug, unsigned devnum, unsigned endpoint, const char *bytes, int size)
{
unsigned pids, addr, ctrl;
int ret;
if (size > DBGP_MAX_PACKET)
return -1;
addr = DBGP_EPADDR(devnum, endpoint);
pids = readl(&ehci_debug->pids);
pids = DBGP_PID_UPDATE(pids, USB_PID_OUT);
ctrl = readl(&ehci_debug->control);
ctrl = DBGP_LEN_UPDATE(ctrl, size);
ctrl |= DBGP_OUT;
ctrl |= DBGP_GO;
dbgp_set_data(ehci_debug, bytes, size);
writel(addr, &ehci_debug->address);
writel(pids, &ehci_debug->pids);
ret = dbgp_wait_until_done(ehci_debug, ctrl);
if (ret < 0) {
return ret;
}
return ret;
}
int dbgp_bulk_write_x(struct ehci_debug_info *dbg_info, const char *bytes, int size)
{
return dbgp_bulk_write(dbg_info->ehci_debug, dbg_info->devnum, dbg_info->endpoint_out, bytes, size);
}
static int dbgp_bulk_read(struct ehci_dbg_port *ehci_debug, unsigned devnum, unsigned endpoint, void *data, int size)
{
unsigned pids, addr, ctrl;
int ret;
if (size > DBGP_MAX_PACKET)
return -1;
addr = DBGP_EPADDR(devnum, endpoint);
pids = readl(&ehci_debug->pids);
pids = DBGP_PID_UPDATE(pids, USB_PID_IN);
ctrl = readl(&ehci_debug->control);
ctrl = DBGP_LEN_UPDATE(ctrl, size);
ctrl &= ~DBGP_OUT;
ctrl |= DBGP_GO;
writel(addr, &ehci_debug->address);
writel(pids, &ehci_debug->pids);
ret = dbgp_wait_until_done(ehci_debug, ctrl);
if (ret < 0)
return ret;
if (size > ret)
size = ret;
dbgp_get_data(ehci_debug, data, size);
return ret;
}
int dbgp_bulk_read_x(struct ehci_debug_info *dbg_info, void *data, int size)
{
return dbgp_bulk_read(dbg_info->ehci_debug, dbg_info->devnum, dbg_info->endpoint_in, data, size);
}
static int dbgp_control_msg(struct ehci_dbg_port *ehci_debug, unsigned devnum, int requesttype, int request,
int value, int index, void *data, int size)
{
unsigned pids, addr, ctrl;
struct usb_ctrlrequest req;
int read;
int ret;
read = (requesttype & USB_DIR_IN) != 0;
if (size > (read?DBGP_MAX_PACKET:0))
return -1;
/* Compute the control message */
req.bRequestType = requesttype;
req.bRequest = request;
req.wValue = value;
req.wIndex = index;
req.wLength = size;
pids = DBGP_PID_SET(USB_PID_DATA0, USB_PID_SETUP);
addr = DBGP_EPADDR(devnum, 0);
ctrl = readl(&ehci_debug->control);
ctrl = DBGP_LEN_UPDATE(ctrl, sizeof(req));
ctrl |= DBGP_OUT;
ctrl |= DBGP_GO;
/* Send the setup message */
dbgp_set_data(ehci_debug, &req, sizeof(req));
writel(addr, &ehci_debug->address);
writel(pids, &ehci_debug->pids);
ret = dbgp_wait_until_done(ehci_debug, ctrl);
if (ret < 0)
return ret;
/* Read the result */
ret = dbgp_bulk_read(ehci_debug, devnum, 0, data, size);
return ret;
}
static int ehci_reset_port(struct ehci_regs *ehci_regs, int port)
{
unsigned portsc;
unsigned delay_time, delay;
int loop;
/* Reset the usb debug port */
portsc = readl(&ehci_regs->port_status[port - 1]);
portsc &= ~PORT_PE;
portsc |= PORT_RESET;
writel(portsc, &ehci_regs->port_status[port - 1]);
delay = HUB_ROOT_RESET_TIME;
for (delay_time = 0; delay_time < HUB_RESET_TIMEOUT;
delay_time += delay) {
dbgp_mdelay(delay);
portsc = readl(&ehci_regs->port_status[port - 1]);
if (portsc & PORT_RESET) {
/* force reset to complete */
loop = 2;
writel(portsc & ~(PORT_RWC_BITS | PORT_RESET),
&ehci_regs->port_status[port - 1]);
do {
dbgp_mdelay(delay);
portsc = readl(&ehci_regs->port_status[port - 1]);
delay_time += delay;
} while ((portsc & PORT_RESET) && (--loop > 0));
if (!loop) {
printk_debug("ehci_reset_port forced done");
}
}
/* Device went away? */
if (!(portsc & PORT_CONNECT))
return -107;//-ENOTCONN;
/* bomb out completely if something weird happend */
if ((portsc & PORT_CSC))
return -22;//-EINVAL;
/* If we've finished resetting, then break out of the loop */
if (!(portsc & PORT_RESET) && (portsc & PORT_PE))
return 0;
}
return -16;//-EBUSY;
}
static int ehci_wait_for_port(struct ehci_regs *ehci_regs, int port)
{
unsigned status;
int ret, reps;
for (reps = 0; reps < 3; reps++) {
dbgp_mdelay(100);
status = readl(&ehci_regs->status);
if (status & STS_PCD) {
ret = ehci_reset_port(ehci_regs, port);
if (ret == 0)
return 0;
}
}
return -107; //-ENOTCONN;
}
#define DBGP_DEBUG 1
#if DBGP_DEBUG
# define dbgp_printk printk_debug
#else
#define dbgp_printk(fmt, arg...) do {} while(0)
#endif
static void usbdebug_direct_init(unsigned ehci_bar, unsigned offset, struct ehci_debug_info *info)
{
struct ehci_caps *ehci_caps;
struct ehci_regs *ehci_regs;
struct ehci_dbg_port *ehci_debug;
unsigned dbgp_endpoint_out;
unsigned dbgp_endpoint_in;
struct usb_debug_descriptor dbgp_desc;
unsigned ctrl, devnum;
int ret;
unsigned delay_time, delay;
int loop;
unsigned cmd, status, portsc, hcs_params, debug_port, n_ports, new_debug_port;
int i;
unsigned port_map_tried;
unsigned playtimes = 3;
ehci_caps = (struct ehci_caps *)ehci_bar;
ehci_regs = (struct ehci_regs *)(ehci_bar + HC_LENGTH(readl(&ehci_caps->hc_capbase)));
ehci_debug = (struct ehci_dbg_port *)(ehci_bar + offset);
info->ehci_debug = (void *)0;
try_next_time:
port_map_tried = 0;
try_next_port:
hcs_params = readl(&ehci_caps->hcs_params);
debug_port = HCS_DEBUG_PORT(hcs_params);
n_ports = HCS_N_PORTS(hcs_params);
dbgp_printk("debug_port: %d\n", debug_port);
dbgp_printk("n_ports: %d\n", n_ports);
#if 0
for (i = 1; i <= n_ports; i++) {
portsc = readl(&ehci_regs->port_status[i-1]);
dbgp_printk("portstatus%d: %08x\n", i, portsc);
}
#endif
if(port_map_tried && (new_debug_port!=debug_port)) {
if(--playtimes) {
set_debug_port(debug_port);
goto try_next_time;
}
return;
}
/* Reset the EHCI controller */
loop = 10;
cmd = readl(&ehci_regs->command);
cmd |= CMD_RESET;
writel(cmd, &ehci_regs->command);
do {
cmd = readl(&ehci_regs->command);
} while ((cmd & CMD_RESET) && (--loop > 0));
if(!loop) {
dbgp_printk("can not reset ehci\n");
return;
}
dbgp_printk("ehci reset done\n");
/* Claim ownership, but do not enable yet */
ctrl = readl(&ehci_debug->control);
ctrl |= DBGP_OWNER;
ctrl &= ~(DBGP_ENABLED | DBGP_INUSE);
writel(ctrl, &ehci_debug->control);
/* Start the ehci running */
cmd = readl(&ehci_regs->command);
cmd &= ~(CMD_LRESET | CMD_IAAD | CMD_PSE | CMD_ASE | CMD_RESET);
cmd |= CMD_RUN;
writel(cmd, &ehci_regs->command);
/* Ensure everything is routed to the EHCI */
writel(FLAG_CF, &ehci_regs->configured_flag);
/* Wait until the controller is no longer halted */
loop = 10;
do {
status = readl(&ehci_regs->status);
} while ((status & STS_HALT) && (--loop>0));
if(!loop) {
dbgp_printk("ehci can be started\n");
return;
}
dbgp_printk("ehci started\n");
/* Wait for a device to show up in the debug port */
ret = ehci_wait_for_port(ehci_regs, debug_port);
if (ret < 0) {
dbgp_printk("No device found in debug port %d\n", debug_port);
goto next_debug_port;
}
dbgp_printk("ehci wait for port done\n");
/* Enable the debug port */
ctrl = readl(&ehci_debug->control);
ctrl |= DBGP_CLAIM;
writel(ctrl, &ehci_debug->control);
ctrl = readl(&ehci_debug->control);
if ((ctrl & DBGP_CLAIM) != DBGP_CLAIM) {
dbgp_printk("No device in debug port\n");
writel(ctrl & ~DBGP_CLAIM, &ehci_debug->control);
goto err;
}
dbgp_printk("debug ported enabled\n");
/* Completely transfer the debug device to the debug controller */
portsc = readl(&ehci_regs->port_status[debug_port - 1]);
portsc &= ~PORT_PE;
writel(portsc, &ehci_regs->port_status[debug_port - 1]);
dbgp_mdelay(100);
/* Find the debug device and make it device number 127 */
for (devnum = 0; devnum <= 127; devnum++) {
ret = dbgp_control_msg(ehci_debug, devnum,
USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
USB_REQ_GET_DESCRIPTOR, (USB_DT_DEBUG << 8), 0,
&dbgp_desc, sizeof(dbgp_desc));
if (ret > 0)
break;
}
if (devnum > 127) {
dbgp_printk("Could not find attached debug device\n");
goto err;
}
if (ret < 0) {
dbgp_printk("Attached device is not a debug device\n");
goto err;
}
dbgp_endpoint_out = dbgp_desc.bDebugOutEndpoint;
dbgp_endpoint_in = dbgp_desc.bDebugInEndpoint;
/* Move the device to 127 if it isn't already there */
if (devnum != USB_DEBUG_DEVNUM) {
ret = dbgp_control_msg(ehci_debug, devnum,
USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
USB_REQ_SET_ADDRESS, USB_DEBUG_DEVNUM, 0, (void *)0, 0);
if (ret < 0) {
dbgp_printk("Could not move attached device to %d\n",
USB_DEBUG_DEVNUM);
goto err;
}
devnum = USB_DEBUG_DEVNUM;
dbgp_printk("debug device renamed to 127\n");
}
/* Enable the debug interface */
ret = dbgp_control_msg(ehci_debug, USB_DEBUG_DEVNUM,
USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
USB_REQ_SET_FEATURE, USB_DEVICE_DEBUG_MODE, 0, (void *)0, 0);
if (ret < 0) {
dbgp_printk(" Could not enable the debug device\n");
goto err;
}
dbgp_printk("debug interface enabled\n");
/* Perform a small write to get the even/odd data state in sync
*/
ret = dbgp_bulk_write(ehci_debug, USB_DEBUG_DEVNUM, dbgp_endpoint_out, " ",1);
if (ret < 0) {
dbgp_printk("dbgp_bulk_write failed: %d\n", ret);
goto err;
}
dbgp_printk("small write doned\n");
info->ehci_caps = ehci_caps;
info->ehci_regs = ehci_regs;
info->ehci_debug = ehci_debug;
info->devnum = devnum;
info->endpoint_out = dbgp_endpoint_out;
info->endpoint_in = dbgp_endpoint_in;
return;
err:
/* Things didn't work so remove my claim */
ctrl = readl(&ehci_debug->control);
ctrl &= ~(DBGP_CLAIM | DBGP_OUT);
writel(ctrl, &ehci_debug->control);
next_debug_port:
port_map_tried |= (1<<(debug_port-1));
if(port_map_tried != ((1<<n_ports) -1)) {
new_debug_port = ((debug_port-1+1)%n_ports) + 1;
set_debug_port(new_debug_port);
goto try_next_port;
}
if(--playtimes) {
set_debug_port(debug_port);
goto try_next_time;
}
}
Reference in New Issue View Git Blame Copy Permalink