[U-Boot] [PATCH] omap: emif: configure emif only when required
Lokesh Vutla
lokeshvutla at ti.com
Wed Nov 14 17:44:27 CET 2012
On Wednesday 14 November 2012 07:02 PM, R Sricharan wrote:
> On Wednesday 14 November 2012 02:19 PM, Lokesh Vutla wrote:
>> DMM_LISA_MAP registers program whether memory is mapped
>> on particular EMIF or not. Irrespective of these registers
>> EMIF is getting configured. Correcting the same.
>>
>> Signed-off-by: Lokesh Vutla <lokeshvutla at ti.com>
>> ---
>> arch/arm/cpu/armv7/omap-common/emif-common.c | 39
>> ++++++++++++++++++++++----
>> 1 file changed, 34 insertions(+), 5 deletions(-)
>>
>> diff --git a/arch/arm/cpu/armv7/omap-common/emif-common.c
>> b/arch/arm/cpu/armv7/omap-common/emif-common.c
>> index 30dcf1b..179525f 100644
>> --- a/arch/arm/cpu/armv7/omap-common/emif-common.c
>> +++ b/arch/arm/cpu/armv7/omap-common/emif-common.c
>> @@ -33,6 +33,8 @@
>> #include <asm/utils.h>
>> #include <linux/compiler.h>
>>
>> +static int emif1_enabled = -1, emif2_enabled = -1;
>> +
>> void set_lpmode_selfrefresh(u32 base)
>> {
>> struct emif_reg_struct *emif = (struct emif_reg_struct *)base;
>> @@ -1218,6 +1220,27 @@ void dmm_init(u32 base)
>> }
>> }
>>
>> +static void enable_emifs(void)
>> +{
>> + u32 i, section, valid;
>> +
>> + emif1_enabled = 0;
>> + emif2_enabled = 0;
>> + for (i = 0; i < 4; i++) {
>> + section = __raw_readl(DMM_BASE + i*4);
>> + valid = (section & EMIF_SDRC_MAP_MASK) >>
>> + (EMIF_SDRC_MAP_SHIFT);
>> + if (valid == 1) {
>> + emif1_enabled = 1;
>> + } else if (valid == 2) {
>> + emif2_enabled = 1;
>> + } else if (valid == 3) {
>> + emif1_enabled = 1;
>> + emif2_enabled = 1;
>> + return;
>> + }
>> + }
>> +}
>> /*
>> * SDRAM initialization:
>> * SDRAM initialization has two parts:
>> @@ -1255,15 +1278,21 @@ void sdram_init(void)
>> writel(CM_DLL_CTRL_NO_OVERRIDE, &prcm->cm_dll_ctrl);
>> }
>>
>> - do_sdram_init(EMIF1_BASE);
>> - do_sdram_init(EMIF2_BASE);
>> -
>> if (!in_sdram)
>> dmm_init(DMM_BASE);
>>
>> + enable_emifs();
> The function name is odd. It has got nothing to do with enabling
> EMIF's. It just identifies which is enabled ?. How about
> set_enabled_emifs ?
>
> Also this can done just when you are configuring the LISA registers.
> That way a extra function is avoided.
Yes you are right. Ill do this post it.
Thanks
Lokesh
>
> Regards,
> Sricharan
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