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 unsigned long sunxi_dram_init(void);
30 * Wait up to 1s for value to be set in given part of reg.
32 static inline void mctl_await_completion(u32 *reg, u32 mask, u32 val)
34 unsigned long tmo = timer_get_us() + 1000000;
36 while ((readl(reg) & mask) != val) {
37 if (timer_get_us() > tmo)
38 panic("Timeout initialising DRAM\n");
43 * Test if memory at offset offset matches memory at begin of DRAM
45 static inline bool mctl_mem_matches(u32 offset)
47 /* Try to write different values to RAM at two addresses */
48 writel(0, CONFIG_SYS_SDRAM_BASE);
49 writel(0xaa55aa55, CONFIG_SYS_SDRAM_BASE + offset);
50 /* Check if the same value is actually observed when reading back */
51 return readl(CONFIG_SYS_SDRAM_BASE) ==
52 readl(CONFIG_SYS_SDRAM_BASE + offset);
55 #endif /* _SUNXI_DRAM_H */