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-rw-r--r--tools/csr_h4.c120
1 files changed, 116 insertions, 4 deletions
diff --git a/tools/csr_h4.c b/tools/csr_h4.c
index 9140d30d..2a6c156f 100644
--- a/tools/csr_h4.c
+++ b/tools/csr_h4.c
@@ -27,22 +27,133 @@
#include <stdio.h>
#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
#include <stdint.h>
+#include <termios.h>
+
+#include "csr.h"
static uint16_t seqnum = 0x0000;
+static int fd = -1;
+
int csr_open_h4(char *device)
{
- fprintf(stderr, "Transport not implemented\n");
+ struct termios ti;
+
+ if (!device)
+ device = "/dev/ttyS0";
+
+ fd = open(device, O_RDWR | O_NOCTTY);
+ if (fd < 0) {
+ fprintf(stderr, "Can't open serial port: %s (%d)\n",
+ strerror(errno), errno);
+ return -1;
+ }
+
+ tcflush(fd, TCIOFLUSH);
+
+ if (tcgetattr(fd, &ti) < 0) {
+ fprintf(stderr, "Can't get port settings: %s (%d)\n",
+ strerror(errno), errno);
+ close(fd);
+ return -1;
+ }
+
+ cfmakeraw(&ti);
+
+ ti.c_cflag |= CLOCAL;
+ ti.c_cflag |= CRTSCTS;
+
+ if (tcsetattr(fd, TCSANOW, &ti) < 0) {
+ fprintf(stderr, "Can't change port settings: %s (%d)\n",
+ strerror(errno), errno);
+ close(fd);
+ return -1;
+ }
+
+ cfsetospeed(&ti, B38400);
+
+ if (tcsetattr(fd, TCSANOW, &ti) < 0) {
+ fprintf(stderr, "Can't change port settings: %s (%d)\n",
+ strerror(errno), errno);
+ close(fd);
+ return -1;
+ }
+
+ tcflush(fd, TCIOFLUSH);
- return -1;
+ return 0;
}
static int do_command(uint16_t command, uint16_t seqnum, uint16_t varid, uint8_t *value, uint16_t length)
{
- errno = EIO;
+ unsigned char cp[254], rp[254];
+ uint8_t cmd[10];
+ uint16_t size;
+ int len, offset = 3;
+
+ size = (length < 8) ? 9 : ((length + 1) / 2) + 5;
+
+ cmd[0] = command & 0xff;
+ cmd[1] = command >> 8;
+ cmd[2] = size & 0xff;
+ cmd[3] = size >> 8;
+ cmd[4] = seqnum & 0xff;
+ cmd[5] = seqnum >> 8;
+ cmd[6] = varid & 0xff;
+ cmd[7] = varid >> 8;
+ cmd[8] = 0x00;
+ cmd[9] = 0x00;
+
+ memset(cp, 0, sizeof(cp));
+ cp[0] = 0x01;
+ cp[1] = 0x00;
+ cp[2] = 0xfc;
+ cp[3] = (size * 2) + 1;
+ cp[4] = 0xc2;
+ memcpy(cp + 5, cmd, sizeof(cmd));
+ memcpy(cp + 15, value, length);
+
+ if (write(fd, cp, (size * 2) + 5) < 0)
+ return -1;
+
+ switch (varid) {
+ case CSR_VARID_COLD_RESET:
+ case CSR_VARID_WARM_RESET:
+ case CSR_VARID_COLD_HALT:
+ case CSR_VARID_WARM_HALT:
+ return 0;
+ }
+
+ do {
+ if (read(fd, rp, 1) < 1)
+ return -1;
+ } while (rp[0] != 0x04);
+
+ if (read(fd, rp + 1, 2) < 2)
+ return -1;
+
+ do {
+ len = read(fd, rp + offset, sizeof(rp) - offset);
+ offset += len;
+ } while (offset < rp[2] + 3);
+
+ if (rp[0] != 0x04 || rp[1] != 0xff || rp[3] != 0xc2) {
+ errno = EIO;
+ return -1;
+ }
+
+ if ((rp[12] + (rp[13] << 8)) != 0) {
+ errno = ENXIO;
+ return -1;
+ }
+
+ memcpy(value, rp + 14, length);
- return -1;
+ return 0;
}
int csr_read_h4(uint16_t varid, uint8_t *value, uint16_t length)
@@ -57,4 +168,5 @@ int csr_write_h4(uint16_t varid, uint8_t *value, uint16_t length)
void csr_close_h4(void)
{
+ close(fd);
}