remoteproc: add elf file load support

The current implementation supports only binary file load.
Add helpers to support ELF32 format (sanity check, and load).
Note that since an ELF32 image is built for the remote processor, the
load function uses the device_to_virt ops to translate the addresses.
Implement a basic translation for sandbox_testproc.

Add related tests. Test result:
=> ut dm remoteproc_elf
Test: dm_test_remoteproc_elf: remoteproc.c
Test: dm_test_remoteproc_elf: remoteproc.c (flat tree)
Failures: 0

Signed-off-by: Loic Pallardy <loic.pallardy@st.com>
Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>

1 files changed, 122 insertions, 0 deletions

diff --git a/test/dm/remoteproc.c b/test/dm/remoteproc.c
index 3975c67..a2c4be7 100644
--- a/test/dm/remoteproc.c
+++ b/test/dm/remoteproc.c
@@ -5,8 +5,10 @@
  */
 #include <common.h>
 #include <dm.h>
+#include <elf.h>
 #include <errno.h>
 #include <remoteproc.h>
+#include <asm/io.h>
 #include <dm/test.h>
 #include <test/ut.h>
 /**
@@ -65,3 +67,123 @@ static int dm_test_remoteproc_base(struct unit_test_state *uts)
 	return 0;
 }
 DM_TEST(dm_test_remoteproc_base, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
+#define DEVICE_TO_PHYSICAL_OFFSET	0x1000
+/**
+ * dm_test_remoteproc_elf() - test the ELF operations
+ * @uts:	unit test state
+ *
+ * Return:	0 if test passed, else error
+ */
+static int dm_test_remoteproc_elf(struct unit_test_state *uts)
+{
+	u8 valid_elf32[] = {
+		/* @0x00 - ELF HEADER - */
+		/* ELF magic */
+		0x7f, 0x45, 0x4c, 0x46,
+		/* 32 Bits */
+		0x01,
+		/* Endianness */
+#ifdef __LITTLE_ENDIAN
+		0x01,
+#else
+		0x02,
+#endif
+		/* Version */
+		0x01,
+		/* Padding */
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		/* Type : executable */
+		0x02, 0x00,
+		/* Machine: ARM */
+		0x28, 0x00,
+		/* Version */
+		0x01, 0x00, 0x00, 0x00,
+		/* Entry */
+		0x00, 0x00, 0x00, 0x08,
+		/* phoff (program header offset @ 0x40)*/
+		0x40, 0x00, 0x00, 0x00,
+		/* shoff (section header offset : none) */
+		0x00, 0x00, 0x00, 0x00,
+		/* flags */
+		0x00, 0x00, 0x00, 0x00,
+		/* ehsize (elf header size = 0x34) */
+		0x34, 0x00,
+		/* phentsize (program header size = 0x20) */
+		0x20, 0x00,
+		/* phnum (program header number : 1) */
+		0x01, 0x00,
+		/* shentsize (section heade size : none) */
+		0x00, 0x00,
+		/* shnum (section header number: none) */
+		0x00, 0x00,
+		/* shstrndx (section header name section index: none) */
+		0x00, 0x00,
+		/* padding */
+		0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00,
+		/* @0x40 - PROGRAM HEADER TABLE - */
+		/* type : PT_LOAD */
+		0x01, 0x00, 0x00, 0x00,
+		/* offset */
+		0x00, 0x00, 0x00, 0x00,
+		/* vaddr */
+		0x00, 0x00, 0x00, 0x00,
+		/* paddr : physical address */
+		0x00, 0x00, 0x00, 0x00,
+		/* filesz : 0x20 bytes (program header size) */
+		0x20, 0x00, 0x00, 0x00,
+		/* memsz = filesz */
+		0x20, 0x00, 0x00, 0x00,
+		/* flags : readable and exectuable */
+		0x05, 0x00, 0x00, 0x00,
+		/* padding */
+		0x00, 0x00, 0x00, 0x00,
+	};
+	unsigned int size = ARRAY_SIZE(valid_elf32);
+	struct udevice *dev;
+	phys_addr_t loaded_firmware_paddr;
+	void *loaded_firmware;
+	u32 loaded_firmware_size;
+	Elf32_Ehdr *ehdr = (Elf32_Ehdr *)valid_elf32;
+	Elf32_Phdr *phdr = (Elf32_Phdr *)(valid_elf32 + ehdr->e_phoff);
+
+	ut_assertok(uclass_get_device(UCLASS_REMOTEPROC, 0, &dev));
+
+	/*
+	 * In its Program Header Table, let the firmware specifies to be loaded
+	 * at SDRAM_BASE *device* address (p_paddr field).
+	 * Its size is defined by the p_filesz field.
+	 */
+	phdr->p_paddr = CONFIG_SYS_SDRAM_BASE;
+	loaded_firmware_size = phdr->p_filesz;
+
+	/*
+	 * This *device* address is converted to a *physical* address by the
+	 * device_to_virt() operation of sandbox_test_rproc which returns
+	 * DeviceAddress + DEVICE_TO_PHYSICAL_OFFSET.
+	 * This is where we expect to get the firmware loaded.
+	 */
+	loaded_firmware_paddr = phdr->p_paddr + DEVICE_TO_PHYSICAL_OFFSET;
+	loaded_firmware = map_physmem(loaded_firmware_paddr,
+				      loaded_firmware_size, MAP_NOCACHE);
+	ut_assertnonnull(loaded_firmware);
+	memset(loaded_firmware, 0, loaded_firmware_size);
+
+	/* Verify valid ELF format */
+	ut_assertok(rproc_elf32_sanity_check((ulong)valid_elf32, size));
+
+	/* Load firmware in loaded_firmware, and verify it */
+	ut_assertok(rproc_elf32_load_image(dev, (unsigned long)valid_elf32));
+	ut_assertok(memcmp(loaded_firmware, valid_elf32, loaded_firmware_size));
+	unmap_physmem(loaded_firmware, MAP_NOCACHE);
+
+	/* Invalid ELF Magic */
+	valid_elf32[0] = 0;
+	ut_asserteq(-EPROTONOSUPPORT,
+		    rproc_elf32_sanity_check((ulong)valid_elf32, size));
+
+	return 0;
+}
+DM_TEST(dm_test_remoteproc_elf, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);