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From: Andrey Smirnov <andrew.smirnov@gmail.com>
To: barebox@lists.infradead.org
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>
Subject: [PATCH v2 04/12] ARM: i.MX8MQ: Add code to load BL31 ATF blob
Date: Thu, 19 Jul 2018 18:03:49 -0700	[thread overview]
Message-ID: <20180720010357.22822-5-andrew.smirnov@gmail.com> (raw)
In-Reply-To: <20180720010357.22822-1-andrew.smirnov@gmail.com>

Add imx8mq_atf_load_bl31() containing all of the code needed to load
and transfer control to BL31 ATF blob on i.MX8M.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 arch/arm/mach-imx/Makefile           |  2 +-
 arch/arm/mach-imx/atf.c              | 41 ++++++++++++++++++++++++++++
 arch/arm/mach-imx/include/mach/atf.h | 13 +++++++++
 3 files changed, 55 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm/mach-imx/atf.c
 create mode 100644 arch/arm/mach-imx/include/mach/atf.h

diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index 28fe60dba..595a7512c 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -17,7 +17,7 @@ lwl-$(CONFIG_ARCH_IMX6) += imx6-mmdc.o
 obj-$(CONFIG_ARCH_IMX7) += imx7.o
 obj-$(CONFIG_ARCH_VF610) += vf610.o
 obj-$(CONFIG_ARCH_IMX8MQ) += imx8mq.o
-lwl-$(CONFIG_ARCH_IMX8MQ) += imx8-ddrc.o
+lwl-$(CONFIG_ARCH_IMX8MQ) += imx8-ddrc.o atf.o
 obj-$(CONFIG_ARCH_IMX_XLOAD) += xload.o
 obj-$(CONFIG_IMX_IIM)	+= iim.o
 obj-$(CONFIG_NAND_IMX) += nand.o
diff --git a/arch/arm/mach-imx/atf.c b/arch/arm/mach-imx/atf.c
new file mode 100644
index 000000000..2b956b6bd
--- /dev/null
+++ b/arch/arm/mach-imx/atf.c
@@ -0,0 +1,41 @@
+#include <common.h>
+#include <mach/atf.h>
+
+/**
+ * imx8mq_atf_load_bl31 - Load ATF BL31 blob and transfer contol to it
+ *
+ * @fw:		Pointer to the BL31 blob
+ * @fw_size:	Size of the BL31 blob
+ *
+ * This function:
+
+ *     1. Copies built-in BL31 blob to an address i.MX8M's BL31
+ *        expects to be placed
+ *
+ *     2. Sets up temporary stack pointer for EL2, which is execution
+ *        level that BL31 will drop us off at after it completes its
+ *        initialization routine
+ *
+ *     3. Transfers control to BL31
+ *
+ * NOTE: This function expects NXP's implementation of ATF that can be
+ * found at:
+ *     https://source.codeaurora.org/external/imx/imx-atf
+ *
+ * any other implementation may or may not work
+ *
+ */
+void imx8mq_atf_load_bl31(const void *fw, size_t fw_size)
+{
+	void __noreturn (*bl31)(void) = (void *)MX8MQ_ATF_BL31_BASE_ADDR;
+
+	if (WARN_ON(fw_size > MX8MQ_ATF_BL31_SIZE_LIMIT))
+		return;
+
+	memcpy(bl31, fw, fw_size);
+
+	asm volatile("msr sp_el2, %0" : :
+		     "r" (MX8MQ_ATF_BL33_BASE_ADDR - 16) :
+		     "cc");
+	bl31();
+}
\ No newline at end of file
diff --git a/arch/arm/mach-imx/include/mach/atf.h b/arch/arm/mach-imx/include/mach/atf.h
new file mode 100644
index 000000000..aeb24bad0
--- /dev/null
+++ b/arch/arm/mach-imx/include/mach/atf.h
@@ -0,0 +1,13 @@
+#ifndef __IMX_ATF_H__
+#define __IMX_ATF_H__
+
+#include <linux/sizes.h>
+#include <asm/system.h>
+
+#define MX8MQ_ATF_BL31_SIZE_LIMIT	SZ_64K
+#define MX8MQ_ATF_BL31_BASE_ADDR	0x00910000
+#define MX8MQ_ATF_BL33_BASE_ADDR	0x40200000
+
+void imx8mq_atf_load_bl31(const void *fw, size_t fw_size);
+
+#endif
\ No newline at end of file
-- 
2.17.1


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  parent reply	other threads:[~2018-07-20  1:04 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-20  1:03 [PATCH v2 00/12] ARM: i.MX8MQ and EVK support, part II Andrey Smirnov
2018-07-20  1:03 ` [PATCH v2 01/12] ARM: nxp-imx8mq-evk: Update DDR initialization code Andrey Smirnov
2018-07-20  1:03 ` [PATCH v2 02/12] ARM: Add code to support SMCCC on AArch64 Andrey Smirnov
2018-07-20  1:03 ` [PATCH v2 03/12] ARM: i.MX8MQ: Configure cntfrq only in EL3 Andrey Smirnov
2018-07-20  1:03 ` Andrey Smirnov [this message]
2018-07-20  1:03 ` [PATCH v2 05/12] ARM: i.MX: fimware: Add pre-built BL31 ATF blob Andrey Smirnov
2018-07-20  1:03 ` [PATCH v2 06/12] ARM: i.MX: Move i.MX header definitions to mach-imx Andrey Smirnov
2018-07-20  1:03 ` [PATCH v2 07/12] ARM: i.MX: xload-esdhc: Make use of <mach/imx-header.h> Andrey Smirnov
2018-07-20  1:03 ` [PATCH v2 08/12] ARM: i.MX: xload-esdhc: Allow placing image to align its etnry point Andrey Smirnov
2018-07-20  1:03 ` [PATCH v2 09/12] ARM: nxp-imx8mq-evk: Add code to load ATF BL31 blob Andrey Smirnov
2018-07-20  1:03 ` [PATCH v2 10/12] ARM: i.MX8MQ: Query and display ATF fimware hash if availible Andrey Smirnov
2018-07-20  1:03 ` [PATCH v2 11/12] ARM: nxp-imx8mq-evk: Add bootflow comments Andrey Smirnov
2018-07-20  1:03 ` [PATCH v2 12/12] firmware: Fix copy-paste comment mistake Andrey Smirnov
2018-08-08  6:34 ` [PATCH v2 00/12] ARM: i.MX8MQ and EVK support, part II Sascha Hauer

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