X-007 FriendlyARM tiny4412 u-boot移植之内存初始化

Posted 2020-08-22 LoTGu

X-007 FriendlyARM tiny4412 u-boot移植之内存初始化

 

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开发环境：win7 64位 + VMware12 + Ubuntu14.04 64位

工具链：linaro提供的gcc-linaro-6.1.1-2016.08-x86_64_arm-linux-gnueabi

要移植的u-boot版本：u-boot-2016-11

Tiny4412开发板硬件版本为：

    底板：  Tiny4412/Super4412SDK 1506

       核心板：Tiny4412 - 1412

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在上一节中我们把tiny4412开发板上的COM0串口用起来，可以通过COM0串口输出一些调试信息。接下来要做的是初始化tiny4412开发板上的DDR3内存。

 

1、Tiny4412开发板上的DDR3内存

   原理图：Tiny4412-1412-Schematic.pdf

从原理图上可以看出，使用2片K4B4G1646B-HCK内存芯片并联组成了数据位为32bit 1G大小的内存。内存芯片接在exynos4412芯片的DMC0上，使用了一个chip(chip0)，内存地址空间为0x40000000-0x80000000。

 

2、Exynos4412芯片DMC初始化步骤

具体信息在 《Exynos 4412 SCP_Users Manual_Ver.0.10.00_Preliminary.pdf》第18章Dynamic Memory Controller

 

3、Tiny4412 DDR3初始化代码

diff --git a/arch/arm/mach-exynos/dmc_init_exynos4412.c b/arch/arm/mach-exynos/dmc_init_exynos4412.c new file mode 100644 index 0000000..27f72cd --- /dev/null +++ b/arch/arm/mach-exynos/dmc_init_exynos4412.c @@ -0,0 +1,254 @@ +/* + * Memory setup for board based on EXYNOS4412 + * + *                 2016 + * Modified by AP0904225 <[e-mail]> + * + * Copyright (C) 2013 Samsung Electronics + * Rajeshwari Shinde <[e-mail]> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <config.h> +#include <asm/arch/dmc.h> +#include "common_setup.h" +#include "exynos4412_setup.h" + +#ifdef TINY4412 +struct mem_timings mem = { +   .direct_cmd_msr = { +       DIRECT_CMD1, DIRECT_CMD2, DIRECT_CMD3, DIRECT_CMD4 +   }, +   .timingref   = 0x000000BB, +   .timingrow   = 0x6946654f, +   .timingdata  = 0x46460506, +   .timingpower = 0x5200183c, +   .zqcontrol   = 0xE3854C03, +   .control0    = 0x71101008, +   .control1    = 0xe0000086, +   .control2    = 0x00000000, +   .concontrol  = 0x0FFF301A, +   .prechconfig = 0xff000000, +   .memcontrol  = 0x00302640,      /* Tiny4412-1412 core board only use chip0 */ +   .memconfig0  = 0x40C01333,      /* ROW is 15bit */ +   .memconfig1  = 0x80C01333,      /* DMC0 address up to 0x7FFFFFFF */ +   .dll_resync  = FORCE_DLL_RESYNC, +   .dll_on      = DLL_CONTROL_ON, + +}; +#else +struct mem_timings mem = { +   .direct_cmd_msr = { +       DIRECT_CMD1, DIRECT_CMD2, DIRECT_CMD3, DIRECT_CMD4 +   }, +   .timingref = TIMINGREF_VAL, +   .timingrow = TIMINGROW_VAL, +   .timingdata = TIMINGDATA_VAL, +   .timingpower = TIMINGPOWER_VAL, +   .zqcontrol = ZQ_CONTROL_VAL, +   .control0 = CONTROL0_VAL, +   .control1 = CONTROL1_VAL, +   .control2 = CONTROL2_VAL, +   .concontrol = CONCONTROL_VAL, +   .prechconfig = PRECHCONFIG, +   .memcontrol = MEMCONTROL_VAL, +   .memconfig0 = MEMCONFIG0_VAL, +   .memconfig1 = MEMCONFIG1_VAL, +   .dll_resync = FORCE_DLL_RESYNC, +   .dll_on = DLL_CONTROL_ON, +}; +#endif + +static void phy_control_reset(int ctrl_no, struct exynos4_dmc *dmc) +{ +   if (ctrl_no) { +       writel((mem.control1 | (1 << mem.dll_resync)), +              &dmc->phycontrol1); +       writel((mem.control1 | (0 << mem.dll_resync)), +              &dmc->phycontrol1); +   } else { +       writel((mem.control0 | (0 << mem.dll_on)), +              &dmc->phycontrol0); +       writel((mem.control0 | (1 << mem.dll_on)), +              &dmc->phycontrol0); +   } +} + +static void dmc_config_mrs(struct exynos4_dmc *dmc, int chip) +{ +   int i; +   unsigned long mask = 0; + +   if (chip) +       mask = DIRECT_CMD_CHIP1_SHIFT; + +   for (i = 0; i < MEM_TIMINGS_MSR_COUNT; i++) { +       writel(mem.direct_cmd_msr[i] | mask, +              &dmc->directcmd); +   } +} + +static void dmc_init(struct exynos4_dmc *dmc) +{ +   /* +    * DLL Parameter Setting: X-004 FriendlyARM tiny4412 uboot移植之点亮指路灯 X-003 FriendlyARM tiny4412 uboot移植之添加相应目录文件 X-005 FriendlyARM tiny4412 uboot移植之时钟初始化 X-006 FriendlyARM tiny4412 u-boot移植之Debug串口用起来 FriendlyARM Tiny6410-Fedora14-QtSDK-Qt4.7交叉编译环境的建立 X-009 FriendlyARM tiny4412 uboot移植之SD Card用起来Kernel boot起来