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am33xx evm: Update secure_emif_sdram_config during ddr init

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This patch updates secure_emif_sdram_config with the
same value written to sdram_config during ddr3 initialization.

During suspend/resume, this value is copied into sdram_config.
With this, a write to sdram_config at the end of resume sequence
which triggers an init sequence can be avoided.

Without this register write in place, the DDR_RESET line goes
low for a few cycles during resume which is a violation of the
JEDEC spec.

Signed-off-by: Satyanarayana, Sandhya <sandhya.satyanarayana@ti.com>
This commit is contained in:
Satyanarayana, Sandhya 2012-08-09 18:29:57 +00:00 committed by Albert ARIBAUD
parent 25f8bf6eff
commit 6995a28937
3 changed files with 7 additions and 1 deletions
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5
arch/arm/cpu/armv7/am33xx/ddr.c
View file

@ -17,6 +17,7 @@ http://www.ti.com/
#include <asm/arch/cpu.h>
#include <asm/arch/ddr_defs.h>
#include <asm/arch/sys_proto.h>
#include <asm/io.h>
#include <asm/emif.h>
@ -46,8 +47,10 @@ void config_sdram(const struct emif_regs *regs)
{
writel(regs->ref_ctrl, &emif_reg->emif_sdram_ref_ctrl);
writel(regs->ref_ctrl, &emif_reg->emif_sdram_ref_ctrl_shdw);
if (regs->zq_config)
if (regs->zq_config){
writel(regs->zq_config, &emif_reg->emif_zq_config);
writel(regs->sdram_config, &cstat->secure_emif_sdram_config);
}
writel(regs->sdram_config, &emif_reg->emif_sdram_config);
}

2
arch/arm/include/asm/arch-am33xx/cpu.h
View file

@ -234,6 +234,8 @@ struct vtp_reg {
struct ctrl_stat {
unsigned int resv1[16];
unsigned int statusreg; /* ofset 0x40 */
unsigned int resv2[51];
unsigned int secure_emif_sdram_config; /* offset 0x0110 */
};
/* AM33XX GPIO registers */

1
arch/arm/include/asm/arch-am33xx/sys_proto.h
View file

@ -46,6 +46,7 @@ u32 get_sysboot_value(void);
int print_cpuinfo(void);
#endif
extern struct ctrl_stat *cstat;
u32 get_device_type(void);
void setup_clocks_for_console(void);
void ddr_pll_config(unsigned int ddrpll_M);