This is (most of) the usb2 debug console code ripped out of

Uwe's version of yh_rest_of_patch.patch (13.02.07 - [PATCH] 
Rest of huge MCP55 patch).

I dropped a lot of stuff, like broken indenting, removed copyright messages,
and this printk_ram_* stuff (what the heck is this supposed to be)

This codebase is really a mess. Further tarball contributions without a
_CLEANED UP_ patch will be denied, especially if they are not from an up to
date svn tree.

Signed-off-by: Yinghai Lu <yinghai.lu@amd.com>
Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2563 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

2 files changed, 545 insertions, 0 deletions

diff --git a/src/lib/Config.lb b/src/lib/Config.lb
index b2c2821800..7dfc16b82d 100644
--- a/src/lib/Config.lb
+++ b/src/lib/Config.lb
@@ -1,9 +1,15 @@
 uses HAVE_FALLBACK_BOOT
 uses CONFIG_USE_INIT
 uses CONFIG_USE_PRINTK_IN_CAR
+uses CONFIG_USBDEBUG_DIRECT
 
 object clog2.o
 object uart8250.o
+
+if CONFIG_USBDEBUG_DIRECT
+	object usbdebug_direct.o
+end
+
 object memset.o
 object memcpy.o
 object memcmp.o
diff --git a/src/lib/usbdebug_direct.c b/src/lib/usbdebug_direct.c
new file mode 100644
index 0000000000..4b9affea93
--- /dev/null
+++ b/src/lib/usbdebug_direct.c
@@ -0,0 +1,539 @@
+/*
+ * 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 LinuxBIOS 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;
+	}
+
+}
+
+