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