1 /* 2 * DRAM init helper functions 3 * 4 * (C) Copyright 2015 Hans de Goede <hdegoede@redhat.com> 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <common.h> 10 #include <asm/io.h> 11 #include <asm/arch/dram.h> 12 13 /* 14 * Wait up to 1s for value to be set in given part of reg. 15 */ 16 void mctl_await_completion(u32 *reg, u32 mask, u32 val) 17 { 18 unsigned long tmo = timer_get_us() + 1000000; 19 20 while ((readl(reg) & mask) != val) { 21 if (timer_get_us() > tmo) 22 panic("Timeout initialising DRAM\n"); 23 } 24 } 25 26 /* 27 * Test if memory at offset offset matches memory at begin of DRAM 28 */ 29 bool mctl_mem_matches(u32 offset) 30 { 31 /* Try to write different values to RAM at two addresses */ 32 writel(0, CONFIG_SYS_SDRAM_BASE); 33 writel(0xaa55aa55, (ulong)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((ulong)CONFIG_SYS_SDRAM_BASE + offset); 37 } 38