aboutsummaryrefslogtreecommitdiff
path: root/src/adiv5_jtagdp.c
diff options
context:
space:
mode:
authorGareth McMullin2011-02-04 20:23:52 +1300
committerGareth McMullin2011-02-04 20:23:52 +1300
commit406617a2a470021d9412e9280feda0d28bdb653b (patch)
tree43b2cb9b562fde0bf5187c31dea77d72318cfc29 /src/adiv5_jtagdp.c
Import of working source tree.
Diffstat (limited to 'src/adiv5_jtagdp.c')
-rw-r--r--src/adiv5_jtagdp.c123
1 files changed, 123 insertions, 0 deletions
diff --git a/src/adiv5_jtagdp.c b/src/adiv5_jtagdp.c
new file mode 100644
index 0000000..38955bb
--- /dev/null
+++ b/src/adiv5_jtagdp.c
@@ -0,0 +1,123 @@
+/*
+ * This file is part of the Black Magic Debug project.
+ *
+ * Copyright (C) 2011 Black Sphere Technologies Ltd.
+ * Written by Gareth McMullin <gareth@blacksphere.co.nz>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* This file implements the JTAG-DP specific functions of the
+ * ARM Debug Interface v5 Architecure Specification, ARM doc IHI0031A.
+ */
+
+#include "general.h"
+#include "platform.h"
+#include "adiv5.h"
+#include "jtag_scan.h"
+#include "jtagtap.h"
+
+#include <stdlib.h>
+
+#define JTAGDP_ACK_OK 0x02
+#define JTAGDP_ACK_WAIT 0x01
+
+/* 35-bit registers that control the ADIv5 DP */
+#define IR_ABORT 0x8
+#define IR_DPACC 0xA
+#define IR_APACC 0xB
+
+static void adiv5_jtagdp_write(ADIv5_DP_t *dp, uint8_t addr, uint32_t value);
+static uint32_t adiv5_jtagdp_read(ADIv5_DP_t *dp, uint8_t addr);
+
+static void adiv5_jtagdp_write_ap(ADIv5_DP_t *dp, uint8_t addr, uint32_t value);
+static uint32_t adiv5_jtagdp_read_ap(ADIv5_DP_t *dp, uint8_t addr);
+
+static uint32_t adiv5_jtagdp_error(ADIv5_DP_t *dp);
+
+static uint32_t adiv5_jtagdp_low_access(ADIv5_DP_t *dp, uint8_t APnDP, uint8_t RnW,
+ uint8_t addr, uint32_t value);
+
+
+void adiv5_jtag_dp_handler(jtag_dev_t *dev)
+{
+ ADIv5_DP_t *dp = (void*)calloc(1, sizeof(ADIv5_DP_t));
+
+ dp->dev = dev;
+ dp->idcode = dev->idcode;
+
+ dp->dp_write = adiv5_jtagdp_write;
+ dp->dp_read = adiv5_jtagdp_read;
+
+ dp->ap_write = adiv5_jtagdp_write_ap;
+ dp->ap_read = adiv5_jtagdp_read_ap;
+
+ dp->error = adiv5_jtagdp_error;
+
+ dp->low_access = adiv5_jtagdp_low_access;
+
+ adiv5_dp_init(dp);
+}
+
+static void adiv5_jtagdp_write(ADIv5_DP_t *dp, uint8_t addr, uint32_t value)
+{
+ adiv5_jtagdp_low_access(dp, 0, 0, addr, value);
+}
+
+static uint32_t adiv5_jtagdp_read(ADIv5_DP_t *dp, uint8_t addr)
+{
+ adiv5_jtagdp_low_access(dp, 0, 1, addr, 0);
+ return adiv5_jtagdp_low_access(dp, 0, 1, DP_RDBUFF, 0);
+}
+
+static void adiv5_jtagdp_write_ap(ADIv5_DP_t *dp, uint8_t addr, uint32_t value)
+{
+ adiv5_jtagdp_low_access(dp, 1, 0, addr, value);
+}
+
+static uint32_t adiv5_jtagdp_read_ap(ADIv5_DP_t *dp, uint8_t addr)
+{
+ adiv5_jtagdp_low_access(dp, 1, 1, addr, 0);
+ return adiv5_jtagdp_low_access(dp, 0, 1, DP_RDBUFF, 0);
+}
+
+static uint32_t adiv5_jtagdp_error(ADIv5_DP_t *dp)
+{
+ adiv5_jtagdp_low_access(dp, 0, 1, DP_CTRLSTAT, 0);
+ return adiv5_jtagdp_low_access(dp, 0, 0, DP_CTRLSTAT, 0xF0000032) & 0x32;
+}
+
+static uint32_t adiv5_jtagdp_low_access(ADIv5_DP_t *dp, uint8_t APnDP, uint8_t RnW,
+ uint8_t addr, uint32_t value)
+{
+ uint64_t request, response;
+ uint8_t ack;
+
+ request = ((uint64_t)value << 3) | ((addr >> 1) & 0x06) | (RnW?1:0);
+
+ jtag_dev_write_ir(dp->dev, APnDP?IR_APACC:IR_DPACC);
+
+ do {
+ jtag_dev_shift_dr(dp->dev, (uint8_t*)&response, (uint8_t*)&request, 35);
+ ack = response & 0x07;
+ } while(ack == JTAGDP_ACK_WAIT);
+
+ if((ack != JTAGDP_ACK_OK)) {
+ /* Fatal error if invalid ACK response */
+ PLATFORM_FATAL_ERROR(1);
+ }
+
+ return (uint32_t)(response >> 3);
+}
+