Wield battle axe at ARM port

This patch unfortunately incorporates a number of changes,
all of which are making future ARM ports easier.

 - drop cruft that came in with u-boot
 - move serial console from mainboard Kconfig to Exynos Kconfig
 - factor out non-board specific wakeup code
 - move generic bootblock code from mainboard to Exynos
 - actually call arch_cpu_init()
 - remove dead code
 - fix up copyright messages
 - remove snow_ prefix from a lot of code to reduce the noise
   when creating a new mainboard based on that code.

Change-Id: Ic05326edf5a7e1a691c5ff841a604cb9e351b562
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: http://review.coreboot.org/3640
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

6 files changed, 152 insertions, 0 deletions

diff --git a/src/cpu/samsung/exynos5250/Kconfig b/src/cpu/samsung/exynos5250/Kconfig
index cc67abd6ff..eaf6668da6 100644
--- a/src/cpu/samsung/exynos5250/Kconfig
+++ b/src/cpu/samsung/exynos5250/Kconfig
@@ -97,3 +97,41 @@ config SYS_TEXT_BASE
 config COREBOOT_TABLES_SIZE
 	hex
 	default 0x4000000
+
+choice CONSOLE_SERIAL_UART_CHOICES
+	prompt "Serial Console UART"
+	default CONSOLE_SERIAL_UART3
+	depends on CONSOLE_SERIAL_UART
+
+config CONSOLE_SERIAL_UART0
+	bool "UART0"
+	help
+	  Serial console on UART0
+
+config CONSOLE_SERIAL_UART1
+	bool "UART1"
+	help
+	  Serial console on UART1
+
+config CONSOLE_SERIAL_UART2
+	bool "UART2"
+	help
+	  Serial console on UART2
+
+config CONSOLE_SERIAL_UART3
+	bool "UART3"
+	help
+	  Serial console on UART3
+
+endchoice
+
+config CONSOLE_SERIAL_UART_ADDRESS
+	hex
+	depends on CONSOLE_SERIAL_UART
+	default 0x12c00000 if CONSOLE_SERIAL_UART0
+	default 0x12c10000 if CONSOLE_SERIAL_UART1
+	default 0x12c20000 if CONSOLE_SERIAL_UART2
+	default 0x12c30000 if CONSOLE_SERIAL_UART3
+	help
+	  Map the UART names to the respective MMIO address.
+
diff --git a/src/cpu/samsung/exynos5250/Makefile.inc b/src/cpu/samsung/exynos5250/Makefile.inc
index 2cd34284b4..6449714a51 100644
--- a/src/cpu/samsung/exynos5250/Makefile.inc
+++ b/src/cpu/samsung/exynos5250/Makefile.inc
@@ -10,6 +10,7 @@ bootblock-$(CONFIG_EARLY_CONSOLE) += clock.c
 bootblock-$(CONFIG_EARLY_CONSOLE) += monotonic_timer.c
 bootblock-$(CONFIG_EARLY_CONSOLE) += soc.c
 bootblock-$(CONFIG_EARLY_CONSOLE) += uart.c
+bootblock-y += wakeup.c
 
 romstage-y += clock.c
 romstage-y += clock_init.c
@@ -21,6 +22,7 @@ romstage-y += mct.c
 romstage-y += monotonic_timer.c
 romstage-$(CONFIG_EARLY_CONSOLE) += soc.c
 romstage-$(CONFIG_EARLY_CONSOLE) += uart.c
+romstage-y += wakeup.c
 
 #ramstage-y += tzpc_init.c
 ramstage-y += clock.c
diff --git a/src/cpu/samsung/exynos5250/bootblock.c b/src/cpu/samsung/exynos5250/bootblock.c
index 949468fbef..e4d0f6c202 100644
--- a/src/cpu/samsung/exynos5250/bootblock.c
+++ b/src/cpu/samsung/exynos5250/bootblock.c
@@ -17,7 +17,27 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include <console/console.h>
+#include "clk.h"
+#include "wakeup.h"
+
 void bootblock_cpu_init(void);
 void bootblock_cpu_init(void)
 {
+	/* kick off the multi-core timer.
+	 * We want to do this as early as we can.
+	 */
+	mct_start();
+
+	if (get_wakeup_state() == WAKEUP_DIRECT) {
+		wakeup();
+		/* Never returns. */
+	}
+
+	/* For most ARM systems, we have to initialize firmware media source
+	 * (ex, SPI, SD/MMC, or eMMC) now; but for Exynos platform, that is
+	 * already handled by iROM so there's no need to setup again.
+	 */
+
+	console_init();
 }
diff --git a/src/cpu/samsung/exynos5250/cpu.c b/src/cpu/samsung/exynos5250/cpu.c
index 8bf0d49f96..c49dec453d 100644
--- a/src/cpu/samsung/exynos5250/cpu.c
+++ b/src/cpu/samsung/exynos5250/cpu.c
@@ -8,6 +8,7 @@
 #include <arch/cache.h>
 #include <cpu/samsung/exynos5250/fimd.h>
 #include <cpu/samsung/exynos5-common/s5p-dp-core.h>
+#include <cpu/samsung/exynos5-common/cpu.h>
 #include "chip.h"
 #include "cpu.h"
 
@@ -97,6 +98,8 @@ static void cpu_init(device_t dev)
 {
 	exynos_displayport_init(dev);
 	ram_resource(dev, 0, RAM_BASE_KB, RAM_SIZE_KB);
+
+	arch_cpu_init();
 }
 
 static void cpu_noop(device_t dev)
diff --git a/src/cpu/samsung/exynos5250/wakeup.c b/src/cpu/samsung/exynos5250/wakeup.c
new file mode 100644
index 0000000000..1e8d892bc8
--- /dev/null
+++ b/src/cpu/samsung/exynos5250/wakeup.c
@@ -0,0 +1,52 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Google, Inc.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <console/console.h>
+#include <cpu/samsung/exynos5250/power.h>
+#include <cpu/samsung/exynos5-common/exynos5-common.h>
+
+#include "wakeup.h"
+
+void wakeup(void)
+{
+	if (wakeup_need_reset())
+		power_reset();
+
+	power_init();  /* Ensure ps_hold_setup() for early wakeup. */
+	power_exit_wakeup();
+	/* Should never return. */
+	die("Failed to wake up.\n");
+}
+
+int get_wakeup_state(void)
+{
+	uint32_t status = power_read_reset_status();
+
+	/* DIDLE/LPA can be resumed without clock reset (ex, bootblock),
+	 * and SLEEP requires resetting clock (should be done in ROM stage).
+	 */
+
+	if (status == S5P_CHECK_DIDLE || status == S5P_CHECK_LPA)
+		return WAKEUP_DIRECT;
+
+	if (status == S5P_CHECK_SLEEP)
+		return WAKEUP_NEED_CLOCK_RESET;
+
+	return IS_NOT_WAKEUP;
+}
diff --git a/src/cpu/samsung/exynos5250/wakeup.h b/src/cpu/samsung/exynos5250/wakeup.h
new file mode 100644
index 0000000000..ed49d687f6
--- /dev/null
+++ b/src/cpu/samsung/exynos5250/wakeup.h
@@ -0,0 +1,37 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef WAKEUP_H
+#define WAKEUP_H
+
+enum {
+	// A normal boot (not suspend/resume)
+	IS_NOT_WAKEUP,
+	// A wake up event that can be resumed any time
+	WAKEUP_DIRECT,
+	// A wake up event that must be resumed only after
+	// clock and memory controllers are re-initialized
+	WAKEUP_NEED_CLOCK_RESET,
+};
+
+int wakeup_need_reset(void);
+int get_wakeup_state(void);
+void wakeup(void);
+
+#endif	/* WAKEUP_H */