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ARM: uniphier: reserve memory for DRAM PHY training on PH1-LD20

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The DRAM PHY layer on PH1-LD20 is able to calibrate PHY parameters
periodically.  This compensates for the voltage and temperature
deviation and improves the PHY parameter adjustment.  Instead, it
requires 64 byte scratch memory in each DRAM channel for the dynamic
training.  The memory regions must be reserved in DT before jumping
to the kernel.

The scratch area can be anywhere in each DRAM channel, but the DRAM
init code in SPL currently assigns it at the end of each channel.
So, it makes sense to reserve the regions on run-time by U-Boot
instead of statically embedding it in the DT in Linux.  Anyway,
a boot-loader should know much more about memory initialization
than the kernel.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Masahiro Yamada 2016-06-17 19:24:29 +09:00
parent 18c1198667
commit 51ea5a060d
3 changed files with 42 additions and 0 deletions
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1
arch/arm/Kconfig
View file

@ -827,6 +827,7 @@ config ARCH_UNIPHIER
select SPL
select OF_CONTROL
select SPL_OF_CONTROL
select OF_LIBFDT
select DM
select SPL_DM
select DM_GPIO

1
arch/arm/mach-uniphier/Kconfig
View file

@ -40,6 +40,7 @@ config ARCH_UNIPHIER_LD11
config ARCH_UNIPHIER_LD20
bool "UniPhier PH1-LD20 SoC"
select ARCH_UNIPHIER_64BIT
select OF_BOARD_SETUP
endchoice

40
arch/arm/mach-uniphier/dram_init.c
View file

@ -9,6 +9,9 @@
#include <fdtdec.h>
#include <linux/err.h>
#include "init.h"
#include "soc-info.h"
DECLARE_GLOBAL_DATA_PTR;
static const void *get_memory_reg_prop(const void *fdt, int *lenp)
@ -81,3 +84,40 @@ void dram_init_banksize(void)
(unsigned long)gd->bd->bi_dram[i].size);
}
}
#ifdef CONFIG_OF_BOARD_SETUP
/*
* The DRAM PHY requires 64 byte scratch area in each DRAM channel
* for its dynamic PHY training feature.
*/
int ft_board_setup(void *fdt, bd_t *bd)
{
const struct uniphier_board_data *param;
unsigned long rsv_addr;
const unsigned long rsv_size = 64;
int ch, ret;
if (uniphier_get_soc_type() != SOC_UNIPHIER_LD20)
return 0;
param = uniphier_get_board_param();
if (!param) {
printf("failed to get board parameter\n");
return -ENODEV;
}
for (ch = 0; ch < param->dram_nr_ch; ch++) {
rsv_addr = param->dram_ch[ch].base + param->dram_ch[ch].size;
rsv_addr -= rsv_size;
ret = fdt_add_mem_rsv(fdt, rsv_addr, rsv_size);
if (ret)
return -ENOSPC;
printf(" Reserved memory region for DRAM PHY training: addr=%lx size=%lx\n",
rsv_addr, rsv_size);
}
return 0;
}
#endif