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ARM: OMAP5/DRA7: Enable iodelay recalibration to be done from uboot

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Add a new API to perform iodelay recalibration without isolate
io to be used in uboot.

The data manual of J6/J6 Eco recommends to set different IODELAY values
depending on the mode in which the MMC/SD is enumerated in order to
ensure IO timings are met. The MMC driver can use the new API to
set the IO delay values depending on the MMC mode.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
This commit is contained in:
Kishon Vijay Abraham I 2018-01-30 16:01:39 +01:00 committed by Jaehoon Chung
parent 2d7482cf79
commit 6a27333ba3
4 changed files with 33 additions and 4 deletions
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3
arch/arm/include/asm/arch-omap5/dra7xx_iodelay.h
View File

@ -83,6 +83,9 @@
void __recalibrate_iodelay(struct pad_conf_entry const *pad, int npads,
struct iodelay_cfg_entry const *iodelay,
int niodelays);
void late_recalibrate_iodelay(struct pad_conf_entry const *pad, int npads,
struct iodelay_cfg_entry const *iodelay,
int niodelays);
int __recalibrate_iodelay_start(void);
void __recalibrate_iodelay_end(int ret);

30
arch/arm/mach-omap2/omap5/dra7xx_iodelay.c
View File

@ -272,3 +272,33 @@ err:
__recalibrate_iodelay_end(ret);
}
void late_recalibrate_iodelay(struct pad_conf_entry const *pad, int npads,
struct iodelay_cfg_entry const *iodelay,
int niodelays)
{
int ret = 0;
/* unlock IODELAY CONFIG registers */
writel(CFG_IODELAY_UNLOCK_KEY, (*ctrl)->iodelay_config_base +
CFG_REG_8_OFFSET);
ret = calibrate_iodelay((*ctrl)->iodelay_config_base);
if (ret)
goto err;
ret = update_delay_mechanism((*ctrl)->iodelay_config_base);
/* Configure Mux settings */
do_set_mux32((*ctrl)->control_padconf_core_base, pad, npads);
/* Configure Manual IO timing modes */
ret = do_set_iodelay((*ctrl)->iodelay_config_base, iodelay, niodelays);
if (ret)
goto err;
err:
/* lock IODELAY CONFIG registers */
writel(CFG_IODELAY_LOCK_KEY, (*ctrl)->iodelay_config_base +
CFG_REG_8_OFFSET);
}

2
include/configs/am57xx_evm.h
View File

@ -15,9 +15,7 @@
#include <environment/ti/dfu.h>
#include <linux/sizes.h>
#ifdef CONFIG_SPL_BUILD
#define CONFIG_IODELAY_RECALIBRATION
#endif
#define CONFIG_NR_DRAM_BANKS 2

2
include/configs/dra7xx_evm.h
View File

@ -14,9 +14,7 @@
#include <environment/ti/dfu.h>
#ifdef CONFIG_SPL_BUILD
#define CONFIG_IODELAY_RECALIBRATION
#endif
#define CONFIG_VERY_BIG_RAM
#define CONFIG_NR_DRAM_BANKS 2