2 * DRAM init helper functions
4 * (C) Copyright 2015 Hans de Goede <hdegoede@redhat.com>
6 * SPDX-License-Identifier: GPL-2.0+
11 #include <asm/arch/dram.h>
14 * Wait up to 1s for value to be set in given part of reg.
16 void mctl_await_completion(u32 *reg, u32 mask, u32 val)
18 unsigned long tmo = timer_get_us() + 1000000;
20 while ((readl(reg) & mask) != val) {
21 if (timer_get_us() > tmo)
22 panic("Timeout initialising DRAM\n");
27 * Test if memory at offset offset matches memory at begin of DRAM
29 bool mctl_mem_matches(u32 offset)
31 /* Try to write different values to RAM at two addresses */
32 writel(0, CONFIG_SYS_SDRAM_BASE);
33 writel(0xaa55aa55, CONFIG_SYS_SDRAM_BASE + offset);
34 /* Check if the same value is actually observed when reading back */
35 return readl(CONFIG_SYS_SDRAM_BASE) ==
36 readl(CONFIG_SYS_SDRAM_BASE + offset);