ihex: add ihex2fw tool for converting HEX files into firmware images

Not the straight conversion to binary which objcopy can do for us, but
actually representing each record with its original {addr, length},
because some drivers need that information preserved.

Fix up 'firmware_install' to be able to build $(hostprogs-y) too.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

2 files changed, 261 insertions, 0 deletions

diff --git a/firmware/Makefile b/firmware/Makefile
index 3742feeb066..9e780a331e1 100644
--- a/firmware/Makefile
+++ b/firmware/Makefile
@@ -32,6 +32,9 @@ quiet_cmd_mkdir = MKDIR   $(patsubst $(objtree)/%,%,$@)
 quiet_cmd_ihex  = IHEX    $@
       cmd_ihex  = $(OBJCOPY) -Iihex -Obinary $< $@
 
+quiet_cmd_ihex2fw  = IHEX2FW $@
+      cmd_ihex2fw  = $(objtree)/$(obj)/ihex2fw $< $@
+
 quiet_cmd_fwbin = MK_FW   $@
       cmd_fwbin = FWNAME="$(patsubst firmware/%.gen.S,%,$@)";                \
                   FWSTR="$(subst /,_,$(subst .,_,$(subst -,_,$(patsubst      \
@@ -84,9 +87,18 @@ $(patsubst %,$(obj)/%.gen.S, $(fw-external-y)): %: $(wordsize_deps) \
 $(patsubst %,$(obj)/%.gen.o, $(fw-shipped-y)): %.gen.o: %
 $(patsubst %,$(obj)/%.gen.o, $(fw-external-y)): $(obj)/%.gen.o: $(fwdir)/%
 
+# .ihex is used just as a simple way to hold binary files in a source tree
+# where binaries are frowned upon. They are directly converted with objcopy.
 $(obj)/%: $(obj)/%.ihex | $(objtree)/$(obj)/$$(dir %)
         $(call cmd,ihex)
 
+# .HEX is also Intel HEX, but where the offset and length in each record
+# is actually meaningful, because the firmware has to be loaded in a certain
+# order rather than as a single binary blob. Thus, we convert them into our
+# more compact binary representation of ihex records (<linux/ihex.h>)
+$(obj)/%.fw: $(obj)/%.HEX $(obj)/ihex2fw | $(objtree)/$(obj)/$$(dir %)
+        $(call cmd,ihex2fw)
+
 $(firmware-dirs):
         $(call cmd,mkdir)
 
@@ -101,3 +113,5 @@ targets := $(fw-shipped-) $(patsubst $(obj)/%,%, \
 # Without this, built-in.o won't be created when it's empty, and the
 # final vmlinux link will fail.
 obj-n := dummy
+
+hostprogs-y := ihex2fw
diff --git a/firmware/ihex2fw.c b/firmware/ihex2fw.c
new file mode 100644
index 00000000000..9e77cd2f715
--- /dev/null
+++ b/firmware/ihex2fw.c
@@ -0,0 +1,247 @@
+/*
+ * Parser/loader for IHEX formatted data.
+ *
+ * Copyright © 2008 David Woodhouse <dwmw2@infradead.org>
+ * Copyright © 2005 Jan Harkes <jaharkes@cs.cmu.edu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <stdint.h>
+#include <arpa/inet.h>
+#include <stdio.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+struct ihex_binrec {
+        struct ihex_binrec *next; /* not part of the real data structure */
+        uint32_t addr;
+        uint16_t len;
+        uint8_t data[];
+};
+
+/**
+ * nybble/hex are little helpers to parse hexadecimal numbers to a byte value
+ **/
+static uint8_t nybble(const uint8_t n)
+{
+       if      (n >= '0' && n <= '9') return n - '0';
+       else if (n >= 'A' && n <= 'F') return n - ('A' - 10);
+       else if (n >= 'a' && n <= 'f') return n - ('a' - 10);
+       return 0;
+}
+
+static uint8_t hex(const uint8_t *data, uint8_t *crc)
+{
+       uint8_t val = (nybble(data[0]) << 4) | nybble(data[1]);
+       *crc += val;
+       return val;
+}
+
+static int process_ihex(uint8_t *data, ssize_t size);
+static void file_record(struct ihex_binrec *record);
+static int output_records(int outfd);
+
+static int sort_records = 0;
+
+int main(int argc, char **argv)
+{
+        int infd, outfd;
+        struct stat st;
+        uint8_t *data;
+
+        if (argc == 4 && !strcmp(argv[1], "-s")) {
+                sort_records = 1;
+                argc--;
+                argv++;
+        }
+        if (argc != 3) {
+        usage:
+                fprintf(stderr, "ihex2fw: Convert ihex files into binary "
+                                "representation for use by Linux kernel\n");
+                fprintf(stderr, "usage: ihex2fw [-s] <src.HEX> <dst.fw>\n");
+                fprintf(stderr, "       -s: sort records by address\n");
+                return 1;
+        }
+        if (!strcmp(argv[1], "-"))
+            infd = 0;
+        else
+                infd = open(argv[1], O_RDONLY);
+        if (infd == -1) {
+                fprintf(stderr, "Failed to open source file: %s",
+                        strerror(errno));
+                goto usage;
+        }
+        if (fstat(infd, &st)) {
+                perror("stat");
+                return 1;
+        }
+        data = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, infd, 0);
+        if (data == MAP_FAILED) {
+                perror("mmap");
+                return 1;
+        }
+
+        if (!strcmp(argv[2], "-"))
+            outfd = 1;
+        else
+                outfd = open(argv[2], O_TRUNC|O_CREAT|O_WRONLY, 0644);
+        if (outfd == -1) {
+                fprintf(stderr, "Failed to open destination file: %s",
+                        strerror(errno));
+                goto usage;
+        }
+        if (process_ihex(data, st.st_size))
+                return 1;
+
+        output_records(outfd);
+        return 0;
+}
+
+static int process_ihex(uint8_t *data, ssize_t size)
+{
+        struct ihex_binrec *record;
+        uint32_t offset = 0;
+        uint8_t type, crc = 0, crcbyte = 0;
+        int i, j;
+        int line = 1;
+        int len;
+
+        i = 0;
+next_record:
+        /* search for the start of record character */
+        while (i < size) {
+                if (data[i] == '\n') line++;
+                if (data[i++] == ':') break;
+        }
+
+        /* Minimum record length would be about 10 characters */
+        if (i + 10 > size) {
+                fprintf(stderr, "Can't find valid record at line %d\n", line);
+                return -EINVAL;
+        }
+
+        len = hex(data + i, &crc); i += 2;
+
+        record = malloc((sizeof (*record) + len + 3) & ~3);
+        if (!record) {
+                fprintf(stderr, "out of memory for records\n");
+                return -ENOMEM;
+        }
+        memset(record, 0, (sizeof(*record) + len + 3) & ~3);
+        record->len = len;
+
+        /* now check if we have enough data to read everything */
+        if (i + 8 + (record->len * 2) > size) {
+                fprintf(stderr, "Not enough data to read complete record at line %d\n",
+                        line);
+                return -EINVAL;
+        }
+
+        record->addr  = hex(data + i, &crc) << 8; i += 2;
+        record->addr |= hex(data + i, &crc); i += 2;
+        type = hex(data + i, &crc); i += 2;
+
+        for (j = 0; j < record->len; j++, i += 2)
+                record->data[j] = hex(data + i, &crc);
+
+        /* check CRC */
+        crcbyte = hex(data + i, &crc); i += 2;
+        if (crc != 0) {
+                fprintf(stderr, "CRC failure at line %d: got 0x%X, expected 0x%X\n",
+                        line, crcbyte, (unsigned char)(crcbyte-crc));
+                return -EINVAL;
+        }
+
+        /* Done reading the record */
+        switch (type) {
+        case 0:
+                /* old style EOF record? */
+                if (!record->len)
+                        break;
+
+                record->addr += offset;
+                file_record(record);
+                goto next_record;
+
+        case 1: /* End-Of-File Record */
+                if (record->addr || record->len) {
+                        fprintf(stderr, "Bad EOF record (type 01) format at line %d",
+                                line);
+                        return -EINVAL;
+                }
+                break;
+
+        case 2: /* Extended Segment Address Record (HEX86) */
+        case 4: /* Extended Linear Address Record (HEX386) */
+                if (record->addr || record->len != 2) {
+                        fprintf(stderr, "Bad HEX86/HEX386 record (type %02X) at line %d\n",
+                                type, line);
+                        return -EINVAL;
+                }
+
+                /* We shouldn't really be using the offset for HEX86 because
+                 * the wraparound case is specified quite differently. */
+                offset = record->data[0] << 8 | record->data[1];
+                offset <<= (type == 2 ? 4 : 16);
+                goto next_record;
+
+        case 3: /* Start Segment Address Record */
+        case 5: /* Start Linear Address Record */
+                if (record->addr || record->len != 4) {
+                        fprintf(stderr, "Bad Start Address record (type %02X) at line %d\n",
+                                type, line);
+                        return -EINVAL;
+                }
+
+                /* These records contain the CS/IP or EIP where execution
+                 * starts. Don't really know what to do with them. */
+                goto next_record;
+
+        default:
+                fprintf(stderr, "Unknown record (type %02X)\n", type);
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static struct ihex_binrec *records;
+
+static void file_record(struct ihex_binrec *record)
+{
+        struct ihex_binrec **p = &records;
+
+        while ((*p) && (!sort_records || (*p)->addr < record->addr))
+                p = &((*p)->next);
+
+        record->next = *p;
+        *p = record;
+}
+
+static int output_records(int outfd)
+{
+        unsigned char zeroes[5] = {0, 0, 0, 0, 0};
+        struct ihex_binrec *p = records;
+
+        while (p) {
+                uint16_t writelen = (p->len + 9) & ~3;
+
+                p->addr = htonl(p->addr);
+                p->len = htonl(p->len);
+                write(outfd, &p->addr, writelen);
+                p = p->next;
+        }
+        /* EOF record is zero length, since we don't bother to represent
+           the type field in the binary version */
+        write(outfd, zeroes, 5);
+        return 0;
+}