jtag/core: get rid of variable 'jtag'

The variable 'jtag' is set to 'adapter_driver' during adapter
initialization and is used:
- to check if adapter has been initialized;
- as local copy of adapter_driver.

Introduce a static flag to check if the adapter has been already
initialized and a convenience test function.
Use the test function and the original value of adapter_driver in
the code and drop the variable 'jtag'.

Change-Id: I1b1c54d3b36d7b60390985d787c8449432788141
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/6639
Tested-by: jenkins
Reviewed-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>

diff --git a/src/jtag/core.c b/src/jtag/core.c
index 2de5fda47b1f08531675accfd2333e8baa9e70b0..f0c000a2418657ad9bbf80fc208d745f96567158 100644 (file)
--- a/src/jtag/core.c
+++ b/src/jtag/core.c
@@ -129,11 +129,15 @@ static int speed_khz;
 static int rclk_fallback_speed_khz;
 static enum {CLOCK_MODE_UNSELECTED, CLOCK_MODE_KHZ, CLOCK_MODE_RCLK} clock_mode;
 
-/* FIXME: change name to this variable, it is not anymore JTAG only */
-static struct adapter_driver *jtag;
-
 extern struct adapter_driver *adapter_driver;
 
+static bool adapter_initialized;
+
+static bool is_adapter_initialized(void)
+{
+       return adapter_initialized;
+}
+
 void jtag_set_flush_queue_sleep(int ms)
 {
        jtag_flush_queue_sleep = ms;
@@ -505,7 +509,7 @@ int jtag_add_tms_seq(unsigned nbits, const uint8_t *seq, enum tap_state state)
 {
        int retval;
 
-       if (!(jtag->jtag_ops->supported & DEBUG_CAP_TMS_SEQ))
+       if (!(adapter_driver->jtag_ops->supported & DEBUG_CAP_TMS_SEQ))
                return ERROR_JTAG_NOT_IMPLEMENTED;
 
        jtag_checks();
@@ -627,7 +631,7 @@ static int adapter_system_reset(int req_srst)
 
        /* Maybe change SRST signal state */
        if (jtag_srst != req_srst) {
-               retval = jtag->reset(0, req_srst);
+               retval = adapter_driver->reset(0, req_srst);
                if (retval != ERROR_OK) {
                        LOG_ERROR("SRST error");
                        return ERROR_FAIL;
@@ -764,7 +768,7 @@ void jtag_add_reset(int req_tlr_or_trst, int req_srst)
        int new_srst = 0;
        int new_trst = 0;
 
-       if (!jtag->reset) {
+       if (!adapter_driver->reset) {
                legacy_jtag_add_reset(req_tlr_or_trst, req_srst);
                return;
        }
@@ -813,7 +817,7 @@ void jtag_add_reset(int req_tlr_or_trst, int req_srst)
                /* guarantee jtag queue empty before changing reset status */
                jtag_execute_queue();
 
-               retval = jtag->reset(new_trst, new_srst);
+               retval = adapter_driver->reset(new_trst, new_srst);
                if (retval != ERROR_OK) {
                        jtag_set_error(retval);
                        LOG_ERROR("TRST/SRST error");
@@ -933,7 +937,7 @@ void jtag_check_value_mask(struct scan_field *field, uint8_t *value, uint8_t *ma
 
 int default_interface_jtag_execute_queue(void)
 {
-       if (!jtag) {
+       if (!is_adapter_initialized()) {
                LOG_ERROR("No JTAG interface configured yet.  "
                        "Issue 'init' command in startup scripts "
                        "before communicating with targets.");
@@ -949,11 +953,11 @@ int default_interface_jtag_execute_queue(void)
                 * The fix can be applied immediately after next release (v0.11.0 ?)
                 */
                LOG_ERROR("JTAG API jtag_execute_queue() called on non JTAG interface");
-               if (!jtag->jtag_ops || !jtag->jtag_ops->execute_queue)
+               if (!adapter_driver->jtag_ops || !adapter_driver->jtag_ops->execute_queue)
                        return ERROR_OK;
        }
 
-       int result = jtag->jtag_ops->execute_queue();
+       int result = adapter_driver->jtag_ops->execute_queue();
 
        struct jtag_command *cmd = jtag_command_queue;
        while (debug_level >= LOG_LVL_DEBUG_IO && cmd) {
@@ -1508,7 +1512,7 @@ void jtag_tap_free(struct jtag_tap *tap)
  */
 int adapter_init(struct command_context *cmd_ctx)
 {
-       if (jtag)
+       if (is_adapter_initialized())
                return ERROR_OK;
 
        if (!adapter_driver) {
@@ -1522,9 +1526,9 @@ int adapter_init(struct command_context *cmd_ctx)
        retval = adapter_driver->init();
        if (retval != ERROR_OK)
                return retval;
-       jtag = adapter_driver;
+       adapter_initialized = true;
 
-       if (!jtag->speed) {
+       if (!adapter_driver->speed) {
                LOG_INFO("This adapter doesn't support configurable speed");
                return ERROR_OK;
        }
@@ -1541,7 +1545,7 @@ int adapter_init(struct command_context *cmd_ctx)
        retval = jtag_get_speed(&jtag_speed_var);
        if (retval != ERROR_OK)
                return retval;
-       retval = jtag->speed(jtag_speed_var);
+       retval = adapter_driver->speed(jtag_speed_var);
        if (retval != ERROR_OK)
                return retval;
        retval = jtag_get_speed_readable(&actual_khz);
@@ -1643,9 +1647,9 @@ int jtag_init_inner(struct command_context *cmd_ctx)
 
 int adapter_quit(void)
 {
-       if (jtag && jtag->quit) {
+       if (is_adapter_initialized() && adapter_driver->quit) {
                /* close the JTAG interface */
-               int result = jtag->quit();
+               int result = adapter_driver->quit();
                if (result != ERROR_OK)
                        LOG_ERROR("failed: %d", result);
        }
@@ -1776,15 +1780,15 @@ static int adapter_khz_to_speed(unsigned khz, int *speed)
 {
        LOG_DEBUG("convert khz to interface specific speed value");
        speed_khz = khz;
-       if (!jtag)
+       if (!is_adapter_initialized())
                return ERROR_OK;
        LOG_DEBUG("have interface set up");
-       if (!jtag->khz) {
+       if (!adapter_driver->khz) {
                LOG_ERROR("Translation from khz to jtag_speed not implemented");
                return ERROR_FAIL;
        }
        int speed_div1;
-       int retval = jtag->khz(jtag_get_speed_khz(), &speed_div1);
+       int retval = adapter_driver->khz(jtag_get_speed_khz(), &speed_div1);
        if (retval != ERROR_OK)
                return retval;
        *speed = speed_div1;
@@ -1805,7 +1809,7 @@ static int jtag_set_speed(int speed)
 {
        /* this command can be called during CONFIG,
         * in which case jtag isn't initialized */
-       return jtag ? jtag->speed(speed) : ERROR_OK;
+       return is_adapter_initialized() ? adapter_driver->speed(speed) : ERROR_OK;
 }
 
 int jtag_config_khz(unsigned khz)
@@ -1849,13 +1853,13 @@ int jtag_get_speed_readable(int *khz)
        int retval = jtag_get_speed(&jtag_speed_var);
        if (retval != ERROR_OK)
                return retval;
-       if (!jtag)
+       if (!is_adapter_initialized())
                return ERROR_OK;
-       if (!jtag->speed_div) {
+       if (!adapter_driver->speed_div) {
                LOG_ERROR("Translation from jtag_speed to khz not implemented");
                return ERROR_FAIL;
        }
-       return jtag->speed_div(jtag_speed_var, khz);
+       return adapter_driver->speed_div(jtag_speed_var, khz);
 }
 
 void jtag_set_verify(bool enable)
@@ -1880,14 +1884,14 @@ bool jtag_will_verify_capture_ir(void)
 
 int jtag_power_dropout(int *dropout)
 {
-       if (!jtag) {
+       if (!is_adapter_initialized()) {
                /* TODO: as the jtag interface is not valid all
                 * we can do at the moment is exit OpenOCD */
                LOG_ERROR("No Valid JTAG Interface Configured.");
                exit(-1);
        }
-       if (jtag->power_dropout)
-               return jtag->power_dropout(dropout);
+       if (adapter_driver->power_dropout)
+               return adapter_driver->power_dropout(dropout);
 
        *dropout = 0; /* by default we can't detect power dropout */
        return ERROR_OK;
@@ -1895,8 +1899,8 @@ int jtag_power_dropout(int *dropout)
 
 int jtag_srst_asserted(int *srst_asserted)
 {
-       if (jtag->srst_asserted)
-               return jtag->srst_asserted(srst_asserted);
+       if (adapter_driver->srst_asserted)
+               return adapter_driver->srst_asserted(srst_asserted);
 
        *srst_asserted = 0; /* by default we can't detect srst asserted */
        return ERROR_OK;
@@ -2089,8 +2093,8 @@ int adapter_config_trace(bool enabled, enum tpiu_pin_protocol pin_protocol,
                uint32_t port_size, unsigned int *trace_freq,
                unsigned int traceclkin_freq, uint16_t *prescaler)
 {
-       if (jtag->config_trace) {
-               return jtag->config_trace(enabled, pin_protocol, port_size, trace_freq,
+       if (adapter_driver->config_trace) {
+               return adapter_driver->config_trace(enabled, pin_protocol, port_size, trace_freq,
                        traceclkin_freq, prescaler);
        } else if (enabled) {
                LOG_ERROR("The selected interface does not support tracing");
@@ -2102,8 +2106,8 @@ int adapter_config_trace(bool enabled, enum tpiu_pin_protocol pin_protocol,
 
 int adapter_poll_trace(uint8_t *buf, size_t *size)
 {
-       if (jtag->poll_trace)
-               return jtag->poll_trace(buf, size);
+       if (adapter_driver->poll_trace)
+               return adapter_driver->poll_trace(buf, size);
 
        return ERROR_FAIL;
 }