1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * DRAM init helper functions 4 * 5 * (C) Copyright 2015 Hans de Goede <hdegoede@redhat.com> 6 */ 7 8 #include <common.h> 9 #include <time.h> 10 #include <asm/barriers.h> 11 #include <asm/io.h> 12 #include <asm/arch/dram.h> 13 14 /* 15 * Wait up to 1s for value to be set in given part of reg. 16 */ mctl_await_completion(u32 * reg,u32 mask,u32 val)17void mctl_await_completion(u32 *reg, u32 mask, u32 val) 18 { 19 unsigned long tmo = timer_get_us() + 1000000; 20 21 while ((readl(reg) & mask) != val) { 22 if (timer_get_us() > tmo) 23 panic("Timeout initialising DRAM\n"); 24 } 25 } 26 27 /* 28 * Test if memory at offset offset matches memory at begin of DRAM 29 */ mctl_mem_matches(u32 offset)30bool mctl_mem_matches(u32 offset) 31 { 32 /* Try to write different values to RAM at two addresses */ 33 writel(0, CONFIG_SYS_SDRAM_BASE); 34 writel(0xaa55aa55, (ulong)CONFIG_SYS_SDRAM_BASE + offset); 35 dsb(); 36 /* Check if the same value is actually observed when reading back */ 37 return readl(CONFIG_SYS_SDRAM_BASE) == 38 readl((ulong)CONFIG_SYS_SDRAM_BASE + offset); 39 } 40