armv7/snow: Remove unused modules in bootblock and romstage.

For Exynos/snow, cpu_info and power modules and also some parts of
the GPIO API (which require timer and pwm modules) are not used in the
current bootblock. Clock init only needs to be used if early console
is enabled.

Now our bootblock is 22420 bytes with early serial console and 11192
bytes without. Those include the 8KB BL1 region.

Change-Id: I9c958dafb9cf522df0dcfbef373ce741aa162544
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/2322
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/cpu/samsung/exynos5250/Makefile.inc

@@ -3,23 +3,20 @@
 # image outside of CBFS
 #INTERMEDIATE += exynos5250_add_bl1
 
-# Clock init is done in bootblock to support UART output for
-# debugging. We may add a Kconfig option to disable clock init
-# in the bootblock and try moving it entirely into romstage.
-bootblock-y += clock_init.c
-bootblock-y += clock.c
 bootblock-y += pinmux.c
-bootblock-y += soc.c
+# Clock is required for UART
+bootblock-$(CONFIG_EARLY_CONSOLE) += clock_init.c
+bootblock-$(CONFIG_EARLY_CONSOLE) += clock.c
+bootblock-$(CONFIG_EARLY_CONSOLE) += soc.c
 bootblock-$(CONFIG_EARLY_CONSOLE) += uart.c
 
 romstage-y += clock.c
 romstage-y += clock_init.c
+romstage-y += pinmux.c  # required by s3c24x0_i2c (s5p-common) and uart.
 romstage-y += exynos_cache.c
-romstage-y += pinmux.c
-romstage-y += power.c
-romstage-y += soc.c
 romstage-y += dmc_common.c
 romstage-y += dmc_init_ddr3.c
+romstage-$(CONFIG_EARLY_CONSOLE) += soc.c
 romstage-$(CONFIG_EARLY_CONSOLE) += uart.c
 
 #ramstage-y += tzpc_init.c

src/cpu/samsung/s5p-common/Makefile.inc

@@ -1,8 +1,7 @@
-bootblock-y += pwm.c
 bootblock-y += s5p_gpio.c
-bootblock-y += timer.c
+bootblock-$(CONFIG_EARLY_CONSOLE) += pwm.c
+bootblock-$(CONFIG_EARLY_CONSOLE) += timer.c
 
-romstage-y += cpu_info.c
 romstage-y += pwm.c	# needed by timer.c
 romstage-y += s5p_gpio.c
 romstage-y += timer.c

src/cpu/samsung/s5p-common/s5p_gpio.c

@@ -414,6 +414,12 @@ int gpio_set_value(unsigned gpio, int value)
  */
 #define GPIO_DELAY_US 5
 
+#ifndef __BOOT_BLOCK__
+/*
+ * FIXME(dhendrix): These functions use udelay, which has dependencies on
+ * pwm code and timer code. These aren't necessary for the bootblock and
+ * bloat the image significantly.
+ */
 int gpio_read_mvl3(unsigned gpio)
 {
 	int high, low;
@@ -476,6 +482,7 @@ int gpio_decode_number(unsigned gpio_list[], int count)
 
 	return result;
 }
+#endif	/* __BOOT_BLOCK__ */
 
 static const char *get_cfg_name(int cfg)
 {