From 690bf2f333322e764262e60fd24802205280df5e Mon Sep 17 00:00:00 2001
From: Kyösti Mälkki <kyosti.malkki@gmail.com>
Date: Sat, 6 Jul 2013 11:41:21 +0300
Subject: usbdebug: Use CAR migration
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

If we already initialized EHCI controller and USB device in romstage,
locate active configuration from salvaged CAR_GLOBAL and avoid doing
the hardware initialisation again.

Change-Id: I7cb3a359488b25abc9de49c96c0197f6563a4a2c
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3476
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>
---
 src/include/cbmem.h  |  1 +
 src/lib/cbmem_info.c |  1 +
 src/lib/usbdebug.c   | 37 +++++++++++++++++++++++++++++++++++++
 3 files changed, 39 insertions(+)

diff --git a/src/include/cbmem.h b/src/include/cbmem.h
index 982a6d83d4..b241d34067 100644
--- a/src/include/cbmem.h
+++ b/src/include/cbmem.h
@@ -70,6 +70,7 @@
 #define CBMEM_ID_ROOT		0xff4007ff
 #define CBMEM_ID_VBOOT_HANDOFF	0x780074f0
 #define CBMEM_ID_CAR_GLOBALS	0xcac4e6a3
+#define CBMEM_ID_EHCI_DEBUG	0xe4c1deb9
 #define CBMEM_ID_NONE		0x00000000
 #define CBMEM_ID_AGESA_RUNTIME	0x41474553
 
diff --git a/src/lib/cbmem_info.c b/src/lib/cbmem_info.c
index 65be67c17a..a60761f7b0 100644
--- a/src/lib/cbmem_info.c
+++ b/src/lib/cbmem_info.c
@@ -48,6 +48,7 @@ static struct cbmem_id_to_name {
 	{ CBMEM_ID_VBOOT_HANDOFF,	"VBOOT      " },
 	{ CBMEM_ID_CAR_GLOBALS,		"CAR GLOBALS" },
 	{ CBMEM_ID_AGESA_RUNTIME,	"AGESA RSVD " },
+	{ CBMEM_ID_EHCI_DEBUG,	"USBDEBUG   " },
 };
 
 void cbmem_print_entry(int n, u32 id, u64 base, u64 size)
diff --git a/src/lib/usbdebug.c b/src/lib/usbdebug.c
index 3dc35f1088..7a8402dfa3 100644
--- a/src/lib/usbdebug.c
+++ b/src/lib/usbdebug.c
@@ -26,6 +26,7 @@
 #include <arch/byteorder.h>
 #include <cpu/x86/car.h>
 #include <string.h>
+#include <cbmem.h>
 
 #include <usb_ch9.h>
 #include <ehci.h>
@@ -868,6 +869,38 @@ void pci_ehci_read_resources(struct device *dev)
 }
 #endif
 
+#if CONFIG_CAR_MIGRATION
+#if !defined(__PRE_RAM__) && !defined(__SMM__)
+static int get_usbdebug_from_cbmem(struct ehci_debug_info *info)
+{
+	struct ehci_debug_info *dbg_info_cbmem;
+
+	dbg_info_cbmem = cbmem_find(CBMEM_ID_EHCI_DEBUG);
+	if (dbg_info_cbmem == NULL)
+		return -1;
+
+	memcpy(info, dbg_info_cbmem, sizeof (*info));
+	printk(BIOS_DEBUG, "EHCI debug port found in CBMEM.\n");
+
+	return 0;
+}
+
+#elif defined(__PRE_RAM__)
+static void migrate_ehci_debug(void)
+{
+	struct ehci_debug_info *dbg_info = dbgp_ehci_info();
+	struct ehci_debug_info *dbg_info_cbmem;
+
+	dbg_info_cbmem = cbmem_add(CBMEM_ID_EHCI_DEBUG, sizeof(*dbg_info));
+	if (dbg_info_cbmem == NULL)
+		return;
+
+	memcpy(dbg_info_cbmem, dbg_info, sizeof(*dbg_info));
+}
+CAR_MIGRATE(migrate_ehci_debug);
+#endif
+#endif /* CONFIG_CAR_MIGRATION */
+
 unsigned long pci_ehci_base_regs(pci_devfn_t sdev)
 {
 #ifdef __SIMPLE_DEVICE__
@@ -898,6 +931,10 @@ int usbdebug_init(void)
 {
 	struct ehci_debug_info *dbg_info = dbgp_ehci_info();
 
+#if CONFIG_CAR_MIGRATION && !defined(__PRE_RAM__) && !defined(__SMM__)
+	if (!get_usbdebug_from_cbmem(dbg_info))
+		return 0;
+#endif
 #if defined(__PRE_RAM__) || !CONFIG_EARLY_CONSOLE
 	enable_usbdebug();
 #endif
-- 
cgit v1.2.3