imx: Enable ACTLR.SMP in SPL for i.MX6/7

Similar to what has been done before with c5437e5b for u-boot proper, we
enable the SMP bit for SPL as well. This is necessary when SDP booting
straight into Linux, i.e. falcon boot. When SDP boot mode is active, the
ROM code does not set this bit which makes the caches not work once
activated in Linux.

On an i.MX6ULL (528MHz), this reduces a minimal kernel's boot time into
an initramfs shell from ~6.1s down to ~1.2s.

Signed-off-by: Sven Schwermer <sven@svenschwermer.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>

diff --git a/arch/arm/include/asm/mach-imx/sys_proto.h b/arch/arm/include/asm/mach-imx/sys_proto.h
index 4448349..3f66d22 100644 (file)
--- a/arch/arm/include/asm/mach-imx/sys_proto.h
+++ b/arch/arm/include/asm/mach-imx/sys_proto.h
@@ -236,4 +236,9 @@ unsigned long call_imx_sip_ret2(unsigned long id, unsigned long reg0,
                                unsigned long reg3);
 
 void imx_get_mac_from_fuse(int dev_id, unsigned char *mac);
+
+#if defined(CONFIG_MX6) || defined(CONFIG_MX7) || defined(CONFIG_MX7ULP)
+void enable_ca7_smp(void);
+#endif
+
 #endif

diff --git a/arch/arm/mach-imx/cache.c b/arch/arm/mach-imx/cache.c
index 4e3b49a..ab9b621 100644 (file)
--- a/arch/arm/mach-imx/cache.c
+++ b/arch/arm/mach-imx/cache.c
@@ -11,7 +11,7 @@
 #include <asm/io.h>
 #include <asm/mach-imx/sys_proto.h>
 
-static void enable_ca7_smp(void)
+void enable_ca7_smp(void)
 {
        u32 val;
 

diff --git a/arch/arm/mach-imx/mx6/soc.c b/arch/arm/mach-imx/mx6/soc.c
index bc56ef2..a353bff 100644 (file)
--- a/arch/arm/mach-imx/mx6/soc.c
+++ b/arch/arm/mach-imx/mx6/soc.c
@@ -487,6 +487,9 @@ int arch_cpu_init(void)
        if (is_mx6dqp())
                noc_setup();
 #endif
+
+       enable_ca7_smp();
+
        return 0;
 }
 

diff --git a/arch/arm/mach-imx/mx7/soc.c b/arch/arm/mach-imx/mx7/soc.c
index 2169007..f6aec5a 100644 (file)
--- a/arch/arm/mach-imx/mx7/soc.c
+++ b/arch/arm/mach-imx/mx7/soc.c
@@ -14,6 +14,7 @@
 #include <asm/mach-imx/rdc-sema.h>
 #include <asm/arch/imx-rdc.h>
 #include <asm/mach-imx/boot_mode.h>
+#include <asm/mach-imx/sys_proto.h>
 #include <asm/arch/crm_regs.h>
 #include <asm/bootm.h>
 #include <dm.h>
@@ -323,6 +324,8 @@ int arch_cpu_init(void)
 
        imx_gpcv2_init();
 
+       enable_ca7_smp();
+
        return 0;
 }
 #else

diff --git a/arch/arm/mach-imx/mx7ulp/soc.c b/arch/arm/mach-imx/mx7ulp/soc.c
index c90ce22..bc41cbc 100644 (file)
--- a/arch/arm/mach-imx/mx7ulp/soc.c
+++ b/arch/arm/mach-imx/mx7ulp/soc.c
@@ -13,6 +13,7 @@
 #include <asm/arch/sys_proto.h>
 #include <asm/mach-imx/boot_mode.h>
 #include <asm/mach-imx/hab.h>
+#include <asm/mach-imx/sys_proto.h>
 #include <asm/setup.h>
 #include <linux/bitops.h>
 
@@ -77,6 +78,7 @@ enum bt_mode get_boot_mode(void)
 
 int arch_cpu_init(void)
 {
+       enable_ca7_smp();
        return 0;
 }