[U-Boot] [PATCH 4/7] ARM: at91: sfr: implement DDR input buffers open function

Eugen.Hristev at microchip.com
2019-08-08T07:48:30Z

Add a function in SFR implementation that will open the DDR input
buffers.
This can be called at DRAM initialization time.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
---
arch/arm/mach-at91/atmel_sfr.c | 11 +++++++++++
arch/arm/mach-at91/include/mach/at91_common.h | 3 +++
2 files changed, 14 insertions(+)

diff --git a/arch/arm/mach-at91/atmel_sfr.c b/arch/arm/mach-at91/atmel_sfr.c
index 07bd8ab..13cfba0 100644
--- a/arch/arm/mach-at91/atmel_sfr.c
+++ b/arch/arm/mach-at91/atmel_sfr.c
@@ -29,3 +29,14 @@ void configure_2nd_sram_as_l2_cache(void)
}
#endif

+void configure_ddrcfg_input_buffers(bool open)
+{
+ struct atmel_sfr *sfr = (struct atmel_sfr *)ATMEL_BASE_SFR;
+
+ if (open)
+ writel(ATMEL_SFR_DDRCFG_FDQIEN | ATMEL_SFR_DDRCFG_FDQSIEN,
+ &sfr->ddrcfg);
+ else
+ writel(0, &sfr->ddrcfg);
+}
+
diff --git a/arch/arm/mach-at91/include/mach/at91_common.h b/arch/arm/mach-at91/include/mach/at91_common.h
index df7d0e7..e929b5e 100644
--- a/arch/arm/mach-at91/include/mach/at91_common.h
+++ b/arch/arm/mach-at91/include/mach/at91_common.h
@@ -35,6 +35,9 @@ void at91_disable_wdt(void);
void matrix_init(void);
void redirect_int_from_saic_to_aic(void);
void configure_2nd_sram_as_l2_cache(void);
+#ifdef CONFIG_ATMEL_SFR
+void configure_ddrcfg_input_buffers(bool open);
+#endif

int at91_set_ethaddr(int offset);
int at91_video_show_board_info(void);
--
2.7.4