commit a06015692c8123618eb3fe4c69b2f5cd8b79bd1b
parent 83aa34743767503bf7fda6e9113814003ec3e500
Author: Brian Swetland <swetland@frotz.net>
Date: Sun, 11 May 2014 10:17:31 -0700
mem - interface to simple jtag axi master
Diffstat:
| M | Makefile | | | 8 | ++++++-- |
| A | mem.c | | | 143 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
2 files changed, 149 insertions(+), 2 deletions(-)
diff --git a/Makefile b/Makefile
@@ -2,7 +2,7 @@
CFLAGS := -g -Wall -O2
LIBS := -lusb-1.0
-all: jtag i2c wri2c rdi2c debug
+all: jtag i2c wri2c rdi2c debug mem
jtag.c: jtag.h
jtag-mpsse.c: jtag.h
@@ -26,5 +26,9 @@ DEBUG_OBJS := debug.o jtag-mpsse.o
debug: $(DEBUG_OBJS)
$(CC) -o debug $(DEBUG_OBJS) $(LIBS)
+MEM_OBJS := mem.o jtag-mpsse.o
+mem: $(MEM_OBJS)
+ $(CC) -o mem $(MEM_OBJS) $(LIBS)
+
clean::
- rm -f jtag *.o i2c wri2c rdi2c debug
+ rm -f jtag *.o i2c wri2c rdi2c debug mem
diff --git a/mem.c b/mem.c
@@ -0,0 +1,143 @@
+/* Copyright 2014 Brian Swetland <swetland@frotz.net>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "jtag.h"
+#include "zynq.h"
+
+static JTAG *jtag;
+
+void jconnect(void) {
+ if (!(jtag = jtag_open())) {
+ fprintf(stderr, "jconnect: cannot open usb jtag ifc\n");
+ exit(-1);
+ }
+ if (jtag_enumerate(jtag) <= 0) {
+ fprintf(stderr, "jconnect: cannot enumerate jtag devices\n");
+ exit(-1);
+ }
+ if (jtag_select(jtag, 0x13722093)) {
+ fprintf(stderr, "jconnect: cannot connect to ZYNQ\n");
+ exit(-1);
+ }
+
+ jtag_ir_wr(jtag, XIL_USER4);
+}
+
+u32 jrd(u32 addr) {
+ u64 u;
+ jtag_dr_io(jtag, 4, addr & 7, &u);
+ jtag_dr_io(jtag, 36, 0, &u);
+ return (u32) u;
+}
+
+void jwr(u32 addr, u32 val) {
+ u64 u = ((u64)val) | (((u64) (addr & 7)) << 32) | 0x800000000ULL;
+ jtag_dr_io(jtag, 36, u, &u);
+}
+
+void axi_connect(void) {
+ jconnect();
+ if (jrd(0) != 0x4158494d) {
+ fprintf(stderr,"axi master not detected\n");
+ exit(-1);
+ }
+}
+
+int main(int argc, char **argv) {
+ if ((argc == 4) && (!strcmp(argv[1],"-download"))) {
+ u32 addr = strtoul(argv[2], 0, 0);
+ int fd = 0;
+ int r;
+ u32 n;
+ if (strcmp(argv[3], "-")) {
+ fd = open(argv[3], O_RDONLY);
+ if (fd < 0) {
+ fprintf(stderr,"cannot open '%s'\n",argv[3]);
+ return -1;
+ }
+ }
+ axi_connect();
+ jwr(6, addr-4);
+ for (;;) {
+ r = read(fd, &n, sizeof(n));
+ if (r < 0) {
+ if (errno == EINTR)
+ continue;
+ break;
+ }
+ if (r < 1)
+ break;
+ jwr(4, n);
+ }
+ close(fd);
+ return 0;
+ }
+ if ((argc == 5) && (!strcmp(argv[1],"-upload"))) {
+ u32 addr = strtoul(argv[2], 0, 0);
+ u32 count = strtoul(argv[3], 0, 0) / 4;
+ int fd = 1;
+ if (strcmp(argv[4], "-")) {
+ fd = open(argv[4], O_WRONLY|O_CREAT|O_TRUNC, 0640);
+ if (fd < 0) {
+ fprintf(stderr,"cannot open '%s'\n",argv[4]);
+ return -1;
+ }
+ }
+ axi_connect();
+ while (count > 0) {
+ jwr(7, addr);
+ u32 n = jrd(1);
+ write(fd, &n, sizeof(n));
+ addr += 4;
+ count--;
+ }
+ close(fd);
+ return 0;
+ }
+ if (argc == 3) {
+ u32 addr = strtoul(argv[1], 0, 0);
+ u32 val = strtoul(argv[2], 0, 0);
+ if (argv[1][0] == '-') goto usage;
+ axi_connect();
+ jwr(6, addr);
+ jwr(5, val);
+ return 0;
+ } else if (argc == 2) {
+ u32 addr = strtoul(argv[1], 0, 0);
+ u32 val;
+ if (argv[1][0] == '-') goto usage;
+ axi_connect();
+ jwr(7, addr);
+ val = jrd(1);
+ printf("%08x\n", val);
+ return 0;
+ }
+
+usage:
+ fprintf(stderr,
+ "usage:\n"
+ " write: mem <addr> <val>\n"
+ " read: mem <addr>\n"
+ " write: mem -download <addr> <filename>\n"
+ " read: mem -upload <addr> <length> <filename>\n");
+ return -1;
+}
