timer: Add generic udelay() implementation

Add GENERIC_UDELAY Kconfig option so that a generic
udelay() implementation is provided utilizing the
monotonic timer. That way each board/chipset doesn't
need to duplicate the same udelay(). Additionally,
assume that GENERIC_UDELAY implies init_timer()
is not required.

BUG=None
BRANCH=None
TEST=Built nyan, ryu, and rambi. May need help testing.

Change-Id: I7f511a2324b5aa5d1b2959f4519be85a6a7360e8
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 1a85fbcad778933d13eaef545135abe7e4de46ed
Original-Change-Id: Idd26de19eefc91ee3b0ceddfb1bc2152e19fd8ab
Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/219719
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/9334
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

3 files changed, 2 insertions, 57 deletions

diff --git a/src/soc/nvidia/tegra124/Kconfig b/src/soc/nvidia/tegra124/Kconfig
index 1680f4554c..3ce368b95f 100644
--- a/src/soc/nvidia/tegra124/Kconfig
+++ b/src/soc/nvidia/tegra124/Kconfig
@@ -7,6 +7,8 @@ config SOC_NVIDIA_TEGRA124
 	select ARCH_RAMSTAGE_ARMV7
 	select HAVE_UART_SPECIAL
 	select HAVE_HARD_RESET
+	select HAVE_MONOTONIC_TIMER
+	select GENERIC_UDELAY
 	select BOOTBLOCK_CONSOLE
 	select ARM_BOOTBLOCK_CUSTOM
 	select ARM_LPAE
diff --git a/src/soc/nvidia/tegra124/Makefile.inc b/src/soc/nvidia/tegra124/Makefile.inc
index 6de142d4ce..49669ebd83 100644
--- a/src/soc/nvidia/tegra124/Makefile.inc
+++ b/src/soc/nvidia/tegra124/Makefile.inc
@@ -15,7 +15,6 @@ bootblock-$(CONFIG_SOFTWARE_I2C) += ../tegra/software_i2c.c
 bootblock-y += ../tegra/pingroup.c
 bootblock-y += ../tegra/pinmux.c
 bootblock-y += ../tegra/apbmisc.c
-bootblock-y += timer.c
 ifeq ($(CONFIG_BOOTBLOCK_CONSOLE),y)
 bootblock-$(CONFIG_DRIVERS_UART) += uart.c
 endif
@@ -25,7 +24,6 @@ verstage-y += cbfs.c
 verstage-y += dma.c
 verstage-y += monotonic_timer.c
 verstage-y += spi.c
-verstage-y += timer.c
 verstage-$(CONFIG_DRIVERS_UART) += uart.c
 verstage-y += ../tegra/gpio.c
 verstage-y += ../tegra/i2c.c
@@ -48,7 +46,6 @@ romstage-y += ../tegra/gpio.c
 romstage-y += ../tegra/i2c.c
 romstage-$(CONFIG_SOFTWARE_I2C) += ../tegra/software_i2c.c
 romstage-y += ../tegra/pinmux.c
-romstage-y += timer.c
 romstage-y += cache.c
 romstage-$(CONFIG_DRIVERS_UART) += uart.c
 
@@ -70,7 +67,6 @@ ramstage-y += ../tegra/i2c.c
 ramstage-$(CONFIG_SOFTWARE_I2C) += ../tegra/software_i2c.c
 ramstage-y += ../tegra/pinmux.c
 ramstage-y += ../tegra/usb.c
-ramstage-y += timer.c
 ramstage-$(CONFIG_DRIVERS_UART) += uart.c
 
 rmodules_$(ARCH-romstage-y)-y += monotonic_timer.c
diff --git a/src/soc/nvidia/tegra124/timer.c b/src/soc/nvidia/tegra124/timer.c
deleted file mode 100644
index 83f499cbf1..0000000000
--- a/src/soc/nvidia/tegra124/timer.c
+++ /dev/null
@@ -1,53 +0,0 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright 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
- */
-
-#include <console/console.h>
-#include <timer.h>
-#include <delay.h>
-#include <thread.h>
-
-void init_timer(void)
-{
-}
-
-/* delay x useconds */
-void udelay(unsigned usec)
-{
-	struct mono_time current, end;
-
-	if (!thread_yield_microseconds(usec))
-		return;
-
-	timer_monotonic_get(&current);
-	end = current;
-	mono_time_add_usecs(&end, usec);
-
-	if (mono_time_after(&current, &end)) {
-		printk(BIOS_EMERG, "udelay: 0x%08x is impossibly large\n",
-				usec);
-		/* There's not much we can do if usec is too big. Use a long,
-		 * paranoid delay value and hope for the best... */
-		end = current;
-		mono_time_add_usecs(&end, USECS_PER_SEC);
-	}
-
-	while (mono_time_before(&current, &end))
-		timer_monotonic_get(&current);
-}
-