xref: /openbmc/u-boot/arch/arm/mach-tegra/emc.c (revision 1bad5e14)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (c) 2011 The Chromium OS Authors.
4  */
5 
6 #include <common.h>
7 #include "emc.h"
8 #include <asm/io.h>
9 #include <asm/arch/clock.h>
10 #include <asm/arch/emc.h>
11 #include <asm/arch/pmu.h>
12 #include <asm/arch/tegra.h>
13 #include <asm/arch-tegra/ap.h>
14 #include <asm/arch-tegra/clk_rst.h>
15 #include <asm/arch-tegra/sys_proto.h>
16 
17 DECLARE_GLOBAL_DATA_PTR;
18 
19 /* These rates are hard-coded for now, until fdt provides them */
20 #define EMC_SDRAM_RATE_T20	(333000 * 2 * 1000)
21 #define EMC_SDRAM_RATE_T25	(380000 * 2 * 1000)
22 
23 int board_emc_init(void)
24 {
25 	unsigned rate;
26 
27 	switch (tegra_get_chip_sku()) {
28 	default:
29 	case TEGRA_SOC_T20:
30 		rate  = EMC_SDRAM_RATE_T20;
31 		break;
32 	case TEGRA_SOC_T25:
33 		rate  = EMC_SDRAM_RATE_T25;
34 		break;
35 	}
36 	return tegra_set_emc(gd->fdt_blob, rate);
37 }
38