Exynos5250: Get DDR3 working by changing what is compiled and add a function

This is a minor set of changes to get DDR3 going.

Move compilation of DDR3 startup to the romstage. Fix a prototype that
was missing a void. Remove a function that is overly flexible, and
even though it is overly flexible only actually can handle one type of
RAM. Mainboards only support one type of DRAM, so create a function
to explicitly initialize the type of DDR we have -- DDR3.

With these changes, and the previous changes, google snow is ready to run
the ramstage.

Change-Id: I37e0ab0d2dbc1dd121fb175386a46bc2fb1285e5
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-on: http://review.coreboot.org/2224
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: David Hendricks <dhendrix@chromium.org>

src/cpu/samsung/exynos5250/Makefile.inc

@@ -11,6 +11,8 @@ romstage-y += pinmux.c
 romstage-y += power.c
 romstage-y += soc.c
 romstage-y += uart.c
+romstage-y += dmc_common.c
+romstage-y += dmc_init_ddr3.c
 
 #ramstage-y += clock.c
 #ramstage-y += clock_init.c
@@ -30,8 +32,6 @@ ramstage-y += uart.c
 #ramstage-$(CONFIG_EXYNOS_ACE_SHA) += ace_sha.c
 #ramstage-$(CONFIG_SATA_AHCI) += sata.c
 ramstage-$(CONFIG_SPL_BUILD) += lowlevel_init_c.c
-ramstage-$(CONFIG_SPL_BUILD) += dmc_common.c
-ramstage-$(CONFIG_SPL_BUILD) += dmc_init_ddr3.c
 
 exynos5250_add_bl1: $(obj)/coreboot.pre
 	printf "    DD         Adding Samsung Exynos5250 BL1\n"

src/cpu/samsung/exynos5250/clock_init.c

@@ -744,7 +744,7 @@ struct mem_timings *clock_get_mem_timings(void)
 	return NULL;
 }
 
-void system_clock_init()
+void system_clock_init(void)
 {
 	struct exynos5_clock *clk = (struct exynos5_clock *)EXYNOS5_CLOCK_BASE;
 	struct exynos5_mct_regs *mct_regs =

src/cpu/samsung/exynos5250/dmc_common.c

@@ -26,6 +26,8 @@
 #include <common.h>
 #include <console/console.h>
 #include <cpu/samsung/exynos5250/setup.h>
+#include <cpu/samsung/exynos5250/dmc.h>
+#include <cpu/samsung/exynos5250/clock_init.h>
 #include <cpu/samsung/exynos5-common/spl.h>
 #include <system.h>
 
@@ -179,22 +181,3 @@ void dmc_config_memory(struct mem_timings *mem, struct exynos5_dmc *dmc)
 	writel(DMC_MEMBASECONFIG1_VAL, &dmc->membaseconfig1);
 }
 
-void mem_ctrl_init()
-{
-	struct spl_machine_param *param = spl_get_machine_params();
-	struct mem_timings *mem;
-	int ret;
-
-	mem = clock_get_mem_timings();
-
-	/* If there are any other memory variant, add their init call below */
-	if (param->mem_type == DDR_MODE_DDR3) {
-		ret = ddr3_mem_ctrl_init(mem, param->mem_iv_size);
-		if (ret) {
-			printk(BIOS_ERR, "Memory controller init failed, err: %u", ret);
-			BUG();
-		}
-	} else {
-		die("Unknown memory type");
-	}
-}

src/cpu/samsung/exynos5250/setup.h

@@ -706,10 +706,6 @@ void mem_ctrl_init(void);
  */
 int ddr3_mem_ctrl_init(struct mem_timings *mem, unsigned long mem_iv_size);
 
-/* FIXME(dhendrix): why is this here? commenting it out and we'll use
-   clock_init.h instead */
-//void system_clock_init(void);
-
 void tzpc_init(void);
 /*
  * Configure ZQ I/O interface