[U-Boot] [PATCH v2] ARM: at91: sama5d2: configure the L2 cache memory

[Samuel Mescoff]

The SAMA5D2 has a second internal SRAM that can be reassigned as a L2
cache memory.
Make sure it is configured as a L2 cache memory when booting from a SPL
image.

Based on the commit b5ea95ef2b5b from the at91bootstrap repository.

Signed-off-by: Samuel Mescoff <samuel.mescoff at mobile-devices.fr>
---

Changes for v2:
 - removed useless #ifdef CONFIG_SAMA5D2

 arch/arm/mach-at91/atmel_sfr.c                | 7 +++++++
 arch/arm/mach-at91/include/mach/at91_common.h | 1 +
 arch/arm/mach-at91/include/mach/sama5_sfr.h   | 1 +
 arch/arm/mach-at91/spl_atmel.c                | 4 ++++
 4 files changed, 13 insertions(+)

diff --git a/arch/arm/mach-at91/atmel_sfr.c b/arch/arm/mach-at91/atmel_sfr.c
index 2bccb84..adf44c6 100644
--- a/arch/arm/mach-at91/atmel_sfr.c
+++ b/arch/arm/mach-at91/atmel_sfr.c
@@ -19,3 +19,10 @@ void redirect_int_from_saic_to_aic(void)
 		writel((key32 | ATMEL_SFR_AICREDIR_NSAIC), &sfr->aicredir);
 	}
 }
+
+void configure_2nd_sram_as_l2_cache(void)
+{
+	struct atmel_sfr *sfr = (struct atmel_sfr *)ATMEL_BASE_SFR;
+
+	writel(1, &sfr->l2cc_hramc);
+}
diff --git a/arch/arm/mach-at91/include/mach/at91_common.h b/arch/arm/mach-at91/include/mach/at91_common.h
index efcd74e..0742ffc 100644
--- a/arch/arm/mach-at91/include/mach/at91_common.h
+++ b/arch/arm/mach-at91/include/mach/at91_common.h
@@ -34,5 +34,6 @@ void at91_spl_board_init(void);
 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);
 
 #endif /* AT91_COMMON_H */
diff --git a/arch/arm/mach-at91/include/mach/sama5_sfr.h b/arch/arm/mach-at91/include/mach/sama5_sfr.h
index 7b19a20..b040256 100644
--- a/arch/arm/mach-at91/include/mach/sama5_sfr.h
+++ b/arch/arm/mach-at91/include/mach/sama5_sfr.h
@@ -25,6 +25,7 @@ struct atmel_sfr {
 	u32 sn0;		/* 0x4c */
 	u32 sn1;		/* 0x50 */
 	u32 aicredir;	/* 0x54 */
+	u32 l2cc_hramc;	/* 0x58 */
 };
 
 /* Bit field in DDRCFG */
diff --git a/arch/arm/mach-at91/spl_atmel.c b/arch/arm/mach-at91/spl_atmel.c
index b2fb51d..688289e 100644
--- a/arch/arm/mach-at91/spl_atmel.c
+++ b/arch/arm/mach-at91/spl_atmel.c
@@ -79,6 +79,10 @@ void board_init_f(ulong dummy)
 {
 	switch_to_main_crystal_osc();
 
+#ifdef CONFIG_SAMA5D2
+	configure_2nd_sram_as_l2_cache();
+#endif
+
 	/* disable watchdog */
 	at91_disable_wdt();
 
-- 
2.5.0