ARM: at91: sama5d2: configure the L2 cache memory

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@mobile-devices.fr>
Reviewed-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Andreas Bießmann <andreas.devel@googlemail.com>

diff --git a/arch/arm/mach-at91/atmel_sfr.c b/arch/arm/mach-at91/atmel_sfr.c
index 2bccb84..adf44c6 100644 (file)
--- 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 (file)
--- 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 (file)
--- 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 (file)
--- 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();