2 * (C) Copyright 2007-2012
3 * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
4 * Berg Xing <bergxing@allwinnertech.com>
5 * Tom Cubie <tangliang@allwinnertech.com>
7 * Sunxi platform dram register definition.
9 * SPDX-License-Identifier: GPL-2.0+
16 #include <linux/types.h>
18 /* dram regs definition */
19 #if defined(CONFIG_MACH_SUN6I)
20 #include <asm/arch/dram_sun6i.h>
21 #elif defined(CONFIG_MACH_SUN8I)
22 #include <asm/arch/dram_sun8i.h>
24 #include <asm/arch/dram_sun4i.h>
27 #define MCTL_MEM_FILL_MATCH_COUNT 64
29 unsigned long sunxi_dram_init(void);
32 * Wait up to 1s for value to be set in given part of reg.
34 static inline void mctl_await_completion(u32 *reg, u32 mask, u32 val)
36 unsigned long tmo = timer_get_us() + 1000000;
38 while ((readl(reg) & mask) != val) {
39 if (timer_get_us() > tmo)
40 panic("Timeout initialising DRAM\n");
45 * Fill beginning of DRAM with "random" data for mctl_mem_matches()
47 static inline void mctl_mem_fill(void)
51 for (i = 0; i < MCTL_MEM_FILL_MATCH_COUNT; i++)
52 writel(0xaa55aa55 + i, CONFIG_SYS_SDRAM_BASE + i * 4);
56 * Test if memory at offset offset matches memory at begin of DRAM
58 static inline bool mctl_mem_matches(u32 offset)
60 return memcmp((u32 *)CONFIG_SYS_SDRAM_BASE,
61 (u32 *)(CONFIG_SYS_SDRAM_BASE + offset),
62 MCTL_MEM_FILL_MATCH_COUNT * 4) == 0;
65 #endif /* _SUNXI_DRAM_H */