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ULINK driver: Implement variable TCK frequency in OpenOCD driver 

Signed-off-by: Martin Schmölzer <martin.schmoelzer@student.tuwien.ac.at>
This commit is contained in:
Martin Schmoelzer 2011-08-04 19:03:59 +02:00 committed by Øyvind Harboe
parent 6446dbaacb
commit c331c9382f
1 changed files with 367 additions and 38 deletions
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405
src/jtag/drivers/ulink.c
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@ -22,6 +22,7 @@
#include "config.h"
#endif
#include <math.h>
#include <jtag/interface.h>
#include <jtag/commands.h>
#include <target/image.h>
@ -94,6 +95,15 @@ enum ulink_payload_direction
PAYLOAD_DIRECTION_IN
};
enum ulink_delay_type
{
DELAY_CLOCK_TCK,
DELAY_CLOCK_TMS,
DELAY_SCAN_IN,
DELAY_SCAN_OUT,
DELAY_SCAN_IO
};
/**
* OpenULINK command (OpenULINK command queue element).
*
@ -146,6 +156,12 @@ struct ulink
struct usb_dev_handle *usb_handle;
enum ulink_type type;
int delay_scan_in; ///< Delay value for SCAN_IN commands
int delay_scan_out; ///< Delay value for SCAN_OUT commands
int delay_scan_io; ///< Delay value for SCAN_IO commands
int delay_clock_tck; ///< Delay value for CLOCK_TMS commands
int delay_clock_tms; ///< Delay value for CLOCK_TCK commands
int commands_in_queue; ///< Number of commands in queue
ulink_cmd_t *queue_start; ///< Pointer to first command in queue
ulink_cmd_t *queue_end; ///< Pointer to last command in queue
@ -196,11 +212,15 @@ int ulink_append_get_signals_cmd(struct ulink *device);
int ulink_append_set_signals_cmd(struct ulink *device, uint8_t low,
uint8_t high);
int ulink_append_sleep_cmd(struct ulink *device, uint32_t us);
int ulink_append_configure_tck_cmd(struct ulink *device, uint8_t delay_scan,
uint8_t delay_tck, uint8_t delay_tms);
int ulink_append_configure_tck_cmd(struct ulink *device, int delay_scan_in,
int delay_scan_out, int delay_scan_io, int delay_tck, int delay_tms);
int ulink_append_led_cmd(struct ulink *device, uint8_t led_state);
int ulink_append_test_cmd(struct ulink *device);
/* OpenULINK TCK frequency helper functions */
int ulink_calculate_delay(enum ulink_delay_type type, long f, int *delay);
int ulink_calculate_frequency(enum ulink_delay_type type, int delay, long *f);
/* Interface between OpenULINK and OpenOCD */
static void ulink_set_end_state(tap_state_t endstate);
int ulink_queue_statemove(struct ulink *device);
@ -781,6 +801,9 @@ const char * ulink_cmd_id_string(uint8_t id)
case CMD_CLOCK_TCK:
return "CMD_CLOCK_TCK";
break;
case CMD_SLOW_CLOCK_TCK:
return "CMD_SLOW_CLOCK_TCK";
break;
case CMD_SLEEP_US:
return "CMD_SLEEP_US";
break;
@ -903,18 +926,32 @@ int ulink_append_scan_cmd(struct ulink *device, enum scan_type scan_type,
}
/* Allocate out_payload depending on scan type */
// TODO: set command ID depending on interface speed settings (slow scan)
switch (scan_type) {
case SCAN_IN:
cmd->id = CMD_SCAN_IN;
if (device->delay_scan_in < 0) {
cmd->id = CMD_SCAN_IN;
}
else {
cmd->id = CMD_SLOW_SCAN_IN;
}
ret = ulink_allocate_payload(cmd, 5, PAYLOAD_DIRECTION_OUT);
break;
case SCAN_OUT:
cmd->id = CMD_SCAN_OUT;
if (device->delay_scan_out < 0) {
cmd->id = CMD_SCAN_OUT;
}
else {
cmd->id = CMD_SLOW_SCAN_OUT;
}
ret = ulink_allocate_payload(cmd, scan_size_bytes + 5, PAYLOAD_DIRECTION_OUT);
break;
case SCAN_IO:
cmd->id = CMD_SCAN_IO;
if (device->delay_scan_io < 0) {
cmd->id = CMD_SCAN_IO;
}
else {
cmd->id = CMD_SLOW_SCAN_IO;
}
ret = ulink_allocate_payload(cmd, scan_size_bytes + 5, PAYLOAD_DIRECTION_OUT);
break;
default:
@ -978,7 +1015,12 @@ int ulink_append_clock_tms_cmd(struct ulink *device, uint8_t count,
return ERROR_FAIL;
}
cmd->id = CMD_CLOCK_TMS;
if (device->delay_clock_tms < 0) {
cmd->id = CMD_CLOCK_TMS;
}
else {
cmd->id = CMD_SLOW_CLOCK_TMS;
}
/* CMD_CLOCK_TMS has two OUT payload bytes and zero IN payload bytes */
ret = ulink_allocate_payload(cmd, 2, PAYLOAD_DIRECTION_OUT);
@ -1011,7 +1053,12 @@ int ulink_append_clock_tck_cmd(struct ulink *device, uint16_t count)
return ERROR_FAIL;
}
cmd->id = CMD_CLOCK_TCK;
if (device->delay_clock_tck < 0) {
cmd->id = CMD_CLOCK_TCK;
}
else {
cmd->id = CMD_SLOW_CLOCK_TCK;
}
/* CMD_CLOCK_TCK has two OUT payload bytes and zero IN payload bytes */
ret = ulink_allocate_payload(cmd, 2, PAYLOAD_DIRECTION_OUT);
@ -1132,14 +1179,16 @@ int ulink_append_sleep_cmd(struct ulink *device, uint32_t us)
* Set TCK delay counters
*
* @param device pointer to struct ulink identifying ULINK driver instance.
* @param delay_scan delay count top value in jtag_slow_scan() functions
* @param delay_tck delay count top value in jtag_clock_tck() function
* @param delay_tms delay count top value in jtag_slow_clock_tms() function
* @param delay_scan_in delay count top value in jtag_slow_scan_in() function.
* @param delay_scan_out delay count top value in jtag_slow_scan_out() function.
* @param delay_scan_io delay count top value in jtag_slow_scan_io() function.
* @param delay_tck delay count top value in jtag_clock_tck() function.
* @param delay_tms delay count top value in jtag_slow_clock_tms() function.
* @return on success: ERROR_OK
* @return on failure: ERROR_FAIL
*/
int ulink_append_configure_tck_cmd(struct ulink *device, uint8_t delay_scan,
uint8_t delay_tck, uint8_t delay_tms)
int ulink_append_configure_tck_cmd(struct ulink *device, int delay_scan_in,
int delay_scan_out, int delay_scan_io, int delay_tck, int delay_tms)
{
ulink_cmd_t *cmd = calloc(1, sizeof(ulink_cmd_t));
int ret;
@ -1150,16 +1199,47 @@ int ulink_append_configure_tck_cmd(struct ulink *device, uint8_t delay_scan,
cmd->id = CMD_CONFIGURE_TCK_FREQ;
/* CMD_CONFIGURE_TCK_FREQ has three OUT payload bytes and zero
/* CMD_CONFIGURE_TCK_FREQ has five OUT payload bytes and zero
* IN payload bytes */
ret = ulink_allocate_payload(cmd, 3, PAYLOAD_DIRECTION_OUT);
ret = ulink_allocate_payload(cmd, 5, PAYLOAD_DIRECTION_OUT);
if (ret != ERROR_OK) {
return ret;
}
cmd->payload_out[0] = delay_scan;
cmd->payload_out[1] = delay_tck;
cmd->payload_out[2] = delay_tms;
if (delay_scan_in < 0) {
cmd->payload_out[0] = 0;
}
else {
cmd->payload_out[0] = (uint8_t)delay_scan_in;
}
if (delay_scan_out < 0) {
cmd->payload_out[1] = 0;
}
else {
cmd->payload_out[1] = (uint8_t)delay_scan_out;
}
if (delay_scan_io < 0) {
cmd->payload_out[2] = 0;
}
else {
cmd->payload_out[2] = (uint8_t)delay_scan_io;
}
if (delay_tck < 0) {
cmd->payload_out[3] = 0;
}
else {
cmd->payload_out[3] = (uint8_t)delay_tck;
}
if (delay_tms < 0) {
cmd->payload_out[4] = 0;
}
else {
cmd->payload_out[4] = (uint8_t)delay_tms;
}
return ulink_append_queue(device, cmd);
}
@ -1231,6 +1311,165 @@ int ulink_append_test_cmd(struct ulink *device)
return ulink_append_queue(device, cmd);
}
/****************** OpenULINK TCK frequency helper functions ******************/
/**
* Calculate delay values for a given TCK frequency.
*
* The OpenULINK firmware uses five different speed values for different
* commands. These speed values are calculated in these functions.
*
* The five different commands which support variable TCK frequency are
* implemented twice in the firmware:
* 1. Maximum possible frequency without any artificial delay
* 2. Variable frequency with artificial linear delay loop
*
* To set the ULINK to maximum frequency, it is only neccessary to use the
* corresponding command IDs. To set the ULINK to a lower frequency, the
* delay loop top values have to be calculated first. Then, a
* CMD_CONFIGURE_TCK_FREQ command needs to be sent to the ULINK device.
*
* The delay values are described by linear equations:
* t = k * x + d
* (t = period, k = constant, x = delay value, d = constant)
*
* Thus, the delay can be calculated as in the following equation:
* x = (t - d) / k
*
* The constants in these equations have been determined and validated by
* measuring the frequency resulting from different delay values.
*
* @param type for which command to calculate the delay value.
* @param f TCK frequency for which to calculate the delay value in Hz.
* @param delay where to store resulting delay value.
* @return on success: ERROR_OK
* @return on failure: ERROR_FAIL
*/
int ulink_calculate_delay(enum ulink_delay_type type, long f, int *delay)
{
float t, x, x_ceil;
/* Calculate period of requested TCK frequency */
t = 1.0 / (float)(f);
switch (type) {
case DELAY_CLOCK_TCK:
x = (t - (float)(6E-6)) / (float)(4E-6);
break;
case DELAY_CLOCK_TMS:
x = (t - (float)(8.5E-6)) / (float)(4E-6);
break;
case DELAY_SCAN_IN:
x = (t - (float)(8.8308E-6)) / (float)(4E-6);
break;
case DELAY_SCAN_OUT:
x = (t - (float)(1.0527E-5)) / (float)(4E-6);
break;
case DELAY_SCAN_IO:
x = (t - (float)(1.3132E-5)) / (float)(4E-6);
break;
default:
return ERROR_FAIL;
break;
}
/* Check if the delay value is negative. This happens when a frequency is
* requested that is too high for the delay loop implementation. In this
* case, set delay value to zero. */
if (x < 0) {
x = 0;
}
/* We need to convert the exact delay value to an integer. Therefore, we
* round the exact value UP to ensure that the resulting frequency is NOT
* higher than the requested frequency. */
x_ceil = ceilf(x);
/* Check if the value is within limits */
if (x_ceil > 255) {
return ERROR_FAIL;
}
*delay = (int)x_ceil;
return ERROR_OK;
}
/**
* Calculate frequency for a given delay value.
*
* Similar to the #ulink_calculate_delay function, this function calculates the
* TCK frequency for a given delay value by using linear equations of the form:
* t = k * x + d
* (t = period, k = constant, x = delay value, d = constant)
*
* @param type for which command to calculate the delay value.
* @param delay delay value for which to calculate the resulting TCK frequency.
* @param f where to store the resulting TCK frequency.
* @return on success: ERROR_OK
* @return on failure: ERROR_FAIL
*/
int ulink_calculate_frequency(enum ulink_delay_type type, int delay, long *f)
{
float t, f_float, f_rounded;
if (delay > 255) {
return ERROR_FAIL;
}
switch (type) {
case DELAY_CLOCK_TCK:
if (delay < 0) {
t = (float)(2.666E-6);
}
else {
t = (float)(4E-6) * (float)(delay) + (float)(6E-6);
}
break;
case DELAY_CLOCK_TMS:
if (delay < 0) {
t = (float)(5.666E-6);
}
else {
t = (float)(4E-6) * (float)(delay) + (float)(8.5E-6);
}
break;
case DELAY_SCAN_IN:
if (delay < 0) {
t = (float)(5.5E-6);
}
else {
t = (float)(4E-6) * (float)(delay) + (float)(8.8308E-6);
}
break;
case DELAY_SCAN_OUT:
if (delay < 0) {
t = (float)(7.0E-6);
}
else {
t = (float)(4E-6) * (float)(delay) + (float)(1.0527E-5);
}
break;
case DELAY_SCAN_IO:
if (delay < 0) {
t = (float)(9.926E-6);
}
else {
t = (float)(4E-6) * (float)(delay) + (float)(1.3132E-5);
}
break;
default:
return ERROR_FAIL;
break;
}
f_float = 1.0 / t;
f_rounded = roundf(f_float);
*f = (long)f_rounded;
return ERROR_OK;
}
/******************* Interface between OpenULINK and OpenOCD ******************/
/**
@ -1809,26 +2048,108 @@ static int ulink_execute_queue(void)
/**
* Set the TCK frequency of the ULINK adapter.
*
* @param khz ???
* @param jtag_speed ???
* @param khz desired JTAG TCK frequency.
* @param jtag_speed where to store corresponding adapter-specific speed value.
* @return on success: ERROR_OK
* @return on failure: ERROR_FAIL
*/
static int ulink_khz(int khz, int *jtag_speed)
{
int ret;
if (khz == 0) {
LOG_ERROR("RCLK not supported");
return ERROR_FAIL;
}
LOG_INFO("ulink_khz: %i kHz", khz);
/* ULINK maximum TCK frequency is ~ 150 kHz */
if (khz > 150) {
return ERROR_FAIL;
/* CLOCK_TCK commands are decoupled from others. Therefore, the frequency
* setting can be done independently from all other commands. */
if (khz >= 375) {
ulink_handle->delay_clock_tck = -1;
}
else {
ret = ulink_calculate_delay(DELAY_CLOCK_TCK, khz * 1000,
&ulink_handle->delay_clock_tck);
if (ret != ERROR_OK) {
return ret;
}
}
*jtag_speed = 0;
/* SCAN_{IN,OUT,IO} commands invoke CLOCK_TMS commands. Therefore, if the
* requested frequency goes below the maximum frequency for SLOW_CLOCK_TMS
* commands, all SCAN commands MUST also use the variable frequency
* implementation! */
if (khz >= 176) {
ulink_handle->delay_clock_tms = -1;
ulink_handle->delay_scan_in = -1;
ulink_handle->delay_scan_out = -1;
ulink_handle->delay_scan_io = -1;
}
else {
ret = ulink_calculate_delay(DELAY_CLOCK_TMS, khz * 1000,
&ulink_handle->delay_clock_tms);
if (ret != ERROR_OK) {
return ret;
}
ret = ulink_calculate_delay(DELAY_SCAN_IN, khz * 1000,
&ulink_handle->delay_scan_in);
if (ret != ERROR_OK) {
return ret;
}
ret = ulink_calculate_delay(DELAY_SCAN_OUT, khz * 1000,
&ulink_handle->delay_scan_out);
if (ret != ERROR_OK) {
return ret;
}
ret = ulink_calculate_delay(DELAY_SCAN_IO, khz * 1000,
&ulink_handle->delay_scan_io);
if (ret != ERROR_OK) {
return ret;
}
}
#ifdef _DEBUG_JTAG_IO_
long f_tck, f_tms, f_scan_in, f_scan_out, f_scan_io;
ulink_calculate_frequency(DELAY_CLOCK_TCK, ulink_handle->delay_clock_tck,
&f_tck);
ulink_calculate_frequency(DELAY_CLOCK_TMS, ulink_handle->delay_clock_tms,
&f_tms);
ulink_calculate_frequency(DELAY_SCAN_IN, ulink_handle->delay_scan_in,
&f_scan_in);
ulink_calculate_frequency(DELAY_SCAN_OUT, ulink_handle->delay_scan_out,
&f_scan_out);
ulink_calculate_frequency(DELAY_SCAN_IO, ulink_handle->delay_scan_io,
&f_scan_io);
DEBUG_JTAG_IO("ULINK TCK setup: delay_tck = %i (%li Hz),",
ulink_handle->delay_clock_tck, f_tck);
DEBUG_JTAG_IO(" delay_tms = %i (%li Hz),",
ulink_handle->delay_clock_tms, f_tms);
DEBUG_JTAG_IO(" delay_scan_in = %i (%li Hz),",
ulink_handle->delay_scan_in, f_scan_in);
DEBUG_JTAG_IO(" delay_scan_out = %i (%li Hz),",
ulink_handle->delay_scan_out, f_scan_out);
DEBUG_JTAG_IO(" delay_scan_io = %i (%li Hz),",
ulink_handle->delay_scan_io, f_scan_io);
#endif
/* Configure the ULINK device with the new delay values */
ret = ulink_append_configure_tck_cmd(ulink_handle,
ulink_handle->delay_scan_in,
ulink_handle->delay_scan_out,
ulink_handle->delay_scan_io,
ulink_handle->delay_clock_tck,
ulink_handle->delay_clock_tms);
if (ret != ERROR_OK) {
return ret;
}
*jtag_speed = khz;
return ERROR_OK;
}
@ -1836,30 +2157,38 @@ static int ulink_khz(int khz, int *jtag_speed)
/**
* Set the TCK frequency of the ULINK adapter.
*
* @param speed ???
* Because of the way the TCK frequency is set up in the OpenULINK firmware,
* there are five different speed settings. To simplify things, the
* adapter-specific speed setting value is identical to the TCK frequency in
* khz.
*
* @param speed desired adapter-specific speed value.
* @return on success: ERROR_OK
* @return on failure: ERROR_FAIL
*/
static int ulink_speed(int speed)
{
return ERROR_OK;
int dummy;
return ulink_khz(speed, &dummy);
}
/**
* Convert adapter-specific speed value to corresponding TCK frequency in kHz.
*
* Because of the way the TCK frequency is set up in the OpenULINK firmware,
* there are five different speed settings. To simplify things, the
* adapter-specific speed setting value is identical to the TCK frequency in
* khz.
*
* @param speed adapter-specific speed value.
* @param khz where to store corresponding TCK frequency in kHz.
* @return on success: ERROR_OK
* @return on failure: ERROR_FAIL
*/
static int ulink_speed_div(int speed, int *khz)
{
LOG_INFO("ulink_speed_div: %i", speed);
switch (speed) {
case 0:
*khz = 150;
break;
case 1:
*khz = 100;
break;
}
*khz = speed;
return ERROR_OK;
}