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openpcd/firmware/src/os/dbgu.c

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/* AT91SAM7 debug function implementation for OpenPCD
* (C) 2006 by Harald Welte <hwelte@hmw-consulting.de>
*
* I based this on existing BSD-style licensed code, please see below.
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/*----------------------------------------------------------------------------
* ATMEL Microcontroller Software Support - ROUSSET -
*----------------------------------------------------------------------------
* The software is delivered "AS IS" without warranty or condition of any
* kind, either express, implied or statutory. This includes without
* limitation any warranty or condition with respect to merchantability or
* fitness for any particular purpose, or against the infringements of
* intellectual property rights of others.
*----------------------------------------------------------------------------
* File Name : Debug.c
* Object : Debug menu
* Creation : JPP 14/Sep/2004
* 1.1 29/Aug/05 JPP : Update AIC definion
*----------------------------------------------------------------------------*/
// Include Standard files
#include <board.h>
#include <os/dbgu.h>
#include "../openpcd.h"
#include <os/led.h>
#include <os/main.h>
#include <os/system_irq.h>
#include <os/pcd_enumerate.h>
#include <asm/system.h>
#include <compile.h>
/* In case we find that while (); is non interruptible, we may need to
* uncommend this line: */
// #define ALLOW_INTERRUPT_LOOP asm("nop;nop;nop;nop;nop;nop;nop;nop;")
#define ALLOW_INTERRUPT_LOOP
/* DEBUG_BUFFER_SIZE MUST BE A POWER OF 2 */
#define DEBUG_BUFFER_SIZE (1 << 10)
#define DEBUG_BUFFER_MASK (DEBUG_BUFFER_SIZE - 1)
/*---------------------------- Global Variable ------------------------------*/
//*----------------------------------------------------------------------------
//* Function Name : Send_reset
//* Object : Acknoledeg AIC and send reset
//*----------------------------------------------------------------------------
static void Send_reset(void)
{
void (*pfct) (void) = (void (*)(void))0x00000000;
// Acknoledge the interrupt
// Mark the End of Interrupt on the AIC
AT91C_BASE_AIC->AIC_EOICR = 0;
while (!(AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXEMPTY)) ;
// Jump in reset
pfct();
}
//*----------------------------------------------------------------------------
//* Function Name : DBGU_irq_handler
//* Object : C handler interrupt function called by the sysirq
//* demultiplexer
//*----------------------------------------------------------------------------
static void DBGU_irq_handler(uint32_t sr)
{
static char value;
AT91F_DBGU_Get(&value);
switch (value) {
case '0': //* info
AT91F_DBGU_Frame("Clear Pull up\n\r");
// Set
udp_pullup_on();
break;
case '1': //* info
udp_pullup_off();
AT91F_DBGU_Frame("Set Pull up\n\r");
// Reset Application
Send_reset();
break;
case '2':
AT91F_DBGU_Frame("Toggling LED 1\n\r");
led_toggle(1);
break;
case '3':
AT91F_DBGU_Frame("Toggling LED 2\n\r");
led_toggle(2);
break;
case '9':
AT91F_DBGU_Frame("Resetting SAM7\n\r");
AT91F_RSTSoftReset(AT91C_BASE_RSTC, AT91C_RSTC_PROCRST|
AT91C_RSTC_PERRST|AT91C_RSTC_EXTRST);
break;
default:
if (_main_dbgu(value) < 0)
AT91F_DBGU_Frame("\n\r");
break;
} // end switch
}
void dbgu_rb_init(void);
//*----------------------------------------------------------------------------
//* \fn AT91F_DBGU_Init
//* \brief This function is used to send a string through the DBGU channel (Very low level debugging)
//*----------------------------------------------------------------------------
void AT91F_DBGU_Init(void)
{
unsigned int rst_status = AT91F_RSTGetStatus(AT91C_BASE_RSTC);
dbgu_rb_init();
//* Open PIO for DBGU
AT91F_DBGU_CfgPIO();
//* Enable Transmitter & receivier
((AT91PS_USART) AT91C_BASE_DBGU)->US_CR =
AT91C_US_RSTTX | AT91C_US_RSTRX;
//* Configure DBGU
AT91F_US_Configure((AT91PS_USART) AT91C_BASE_DBGU, // DBGU base address
MCK, AT91C_US_ASYNC_MODE, // Mode Register to be programmed
AT91C_DBGU_BAUD, // Baudrate to be programmed
0); // Timeguard to be programmed
//* Enable Transmitter & receivier
((AT91PS_USART) AT91C_BASE_DBGU)->US_CR = AT91C_US_RXEN | AT91C_US_TXEN;
//* Enable USART IT error and AT91C_US_ENDRX
AT91F_US_EnableIt((AT91PS_USART) AT91C_BASE_DBGU, AT91C_US_RXRDY);
//* open interrupt
sysirq_register(AT91SAM7_SYSIRQ_DBGU, &DBGU_irq_handler);
debugp("\n\r");
debugp("(C) 2006-2011 by Harald Welte <hwelte@hmw-consulting.de>\n\r"
"This software is FREE SOFTWARE licensed under GNU GPL\n\r");
debugp("Version " COMPILE_SVNREV
" compiled " COMPILE_DATE
" by " COMPILE_BY "\n\r\n\r");
debugp("\n\rDEBUG Interface:\n\r"
"0) Set Pull-up 1) Clear Pull-up 2) Toggle LED1 3) "
"Toggle LED2\r\n9) Reset\n\r");
debugp("RSTC_SR=0x%08x\n\r", rst_status);
}
/*
* Disable the PIO assignments for the DBGU
*/
void AT91F_DBGU_Fini(void)
{
((AT91PS_USART) AT91C_BASE_DBGU)->US_CR = AT91C_US_RXDIS | AT91C_US_TXDIS;
AT91F_PIO_CfgOutput(AT91C_BASE_PIOA, AT91C_PA10_DTXD);
AT91F_PIO_CfgInput(AT91C_BASE_PIOA, AT91C_PA9_DRXD);
// Maybe FIXME, do more? -- Henryk Plötz <henryk@ploetzli.ch>
}
//*----------------------------------------------------------------------------
//* \fn AT91F_DBGU_Frame
//* \brief This function is used to send a string through the DBGU channel (Very low level debugging)
//*----------------------------------------------------------------------------
void AT91F_DBGU_Frame(char *buffer)
{
unsigned long intcFlags;
unsigned int len = 0;
while (buffer[len++]) ALLOW_INTERRUPT_LOOP;
len--;
local_irq_save(intcFlags);
AT91C_BASE_DBGU->DBGU_PTCR = 1 << 9; // Disable transfer
if (AT91C_BASE_DBGU->DBGU_TNCR) {
AT91C_BASE_DBGU->DBGU_PTCR = 1 << 8; // Resume transfer
local_irq_restore(intcFlags);
while ((AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXBUFE) == 0) ALLOW_INTERRUPT_LOOP;
local_irq_save(intcFlags);
AT91C_BASE_DBGU->DBGU_PTCR = 1 << 9; // Disable transfer
AT91C_BASE_DBGU->DBGU_TPR = (unsigned)buffer;
AT91C_BASE_DBGU->DBGU_TCR = len;
} else if (AT91C_BASE_DBGU->DBGU_TCR) {
AT91C_BASE_DBGU->DBGU_TNPR = (unsigned)buffer;
AT91C_BASE_DBGU->DBGU_TNCR = len;
} else {
AT91C_BASE_DBGU->DBGU_TPR = (unsigned)buffer;
AT91C_BASE_DBGU->DBGU_TCR = len;
}
AT91C_BASE_DBGU->DBGU_PTCR = 1 << 8; // Resume transfer
local_irq_restore(intcFlags);
/* Return ONLY after we complete Transfer */
while ((AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXBUFE) == 0) ALLOW_INTERRUPT_LOOP;
}
//*----------------------------------------------------------------------------
//* \fn AT91F_US_Get
//* \brief Get a Char to USART
//*----------------------------------------------------------------------------
int AT91F_DBGU_Get(char *val)
{
if ((AT91F_US_RxReady((AT91PS_USART) AT91C_BASE_DBGU)) == 0)
return (0);
else {
*val = AT91F_US_GetChar((AT91PS_USART) AT91C_BASE_DBGU);
return (-1);
}
}
// mthomas: function not used in this application. avoid
// linking huge newlib code for sscanf.
#ifdef DEBUG
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
const char *
hexdump(const void *data, unsigned int len)
{
static char string[256];
unsigned char *d = (unsigned char *) data;
unsigned int i, left;
string[0] = '\0';
left = sizeof(string);
for (i = 0; len--; i += 3) {
if (i >= sizeof(string) -4)
break;
snprintf(string+i, 4, " %02x", *d++);
}
return string;
}
struct dbgu {
char buf[DEBUG_BUFFER_SIZE];
/* Since debugp appears to require to be re-entrant, we need a
* bit more state variables
* in_head Position where incoming *append* characters have
* finished copy to buffer
* in_tail Position where NEW incoming *append* characters
* should COPY to
* out_head Position where the LAST *possibly incomplete*
* dbgu_rb_flush started from
* out_tail Position where the NEXT dbug_rb_flush should
* start from
* The position in the RING should be in this order:
* --> out_tail --> in_head --> in_tail --> out_head -->
*/
volatile unsigned int in_head, in_tail, out_head, out_tail;
/* flush_stack is to indicate rb_flush is being executed, NOT to
* execute again */
volatile unsigned int flush_stack;
/* append_stack is to indicate the re-entrack stack order of the
* current dbgu_append call */
volatile unsigned int append_stack;
};
static struct dbgu dbgu;
void dbgu_rb_init(void)
{
dbgu.in_head = dbgu.in_tail = dbgu.out_head = dbgu.out_tail = 0;
dbgu.flush_stack = dbgu.append_stack = 0;
}
/* flush pending data from debug ring buffer to serial port */
static void dbgu_rb_flush(void)
{
unsigned long intcFlags;
unsigned int flush_stack, start, len;
if (dbgu.in_head == dbgu.out_tail)
return;
/* Transmit can ONLY be disabled when Interrupt is disabled. We
* don't want to be interrupted while Transmit is disabled. */
local_irq_save(intcFlags);
flush_stack = dbgu.flush_stack;
dbgu.flush_stack = 1;
if (flush_stack) {
local_irq_restore(intcFlags);
return;
}
AT91C_BASE_DBGU->DBGU_PTCR = 1 << 9; // Disable transfer
start = (unsigned)dbgu.buf + dbgu.out_tail;
len = (dbgu.in_head - dbgu.out_tail) & DEBUG_BUFFER_MASK;
if (dbgu.in_head > dbgu.out_tail || dbgu.in_head == 0) { // Just 1 fragmentf
if (AT91C_BASE_DBGU->DBGU_TNCR) {
if (AT91C_BASE_DBGU->DBGU_TNPR + AT91C_BASE_DBGU->DBGU_TNCR == start) {
AT91C_BASE_DBGU->DBGU_TNCR += len;
} else {
AT91C_BASE_DBGU->DBGU_PTCR = 1 << 8; // Resume transfer
local_irq_restore(intcFlags);
while ((AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXBUFE) == 0) ALLOW_INTERRUPT_LOOP;
dbgu.out_head = dbgu.out_tail; // in case we are interrupted, they may need more space
/* Since the ONLY place where Transmit is started is dbgu_rb_flush and AT91F_DBGU_Frame and:
* 1) AT91F_DBGU_Frame always leave the dbgu in a TX completed state
* 2) dbgu_rb is non-reentrant by safeguard at the beginning of this routing
* We can assume that after this INTERRUPTIBLE while loop, there are NO data to be transmitted
*/
local_irq_save(intcFlags);
AT91C_BASE_DBGU->DBGU_PTCR = 1 << 9; // Disable transfer
AT91C_BASE_DBGU->DBGU_TPR = start;
AT91C_BASE_DBGU->DBGU_TCR = len;
}
} else if (AT91C_BASE_DBGU->DBGU_TCR) {
if (AT91C_BASE_DBGU->DBGU_TPR + AT91C_BASE_DBGU->DBGU_TCR == start) {
dbgu.out_head = AT91C_BASE_DBGU->DBGU_TPR - (unsigned)dbgu.buf;
AT91C_BASE_DBGU->DBGU_TCR += len;
} else {
AT91C_BASE_DBGU->DBGU_TNPR = start;
AT91C_BASE_DBGU->DBGU_TNCR = len;
}
} else {
AT91C_BASE_DBGU->DBGU_TPR = start;
AT91C_BASE_DBGU->DBGU_TCR = len;
dbgu.out_head = dbgu.out_tail;
}
} else { // 2 fragments
if ((AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXBUFE) == 0) {
AT91C_BASE_DBGU->DBGU_PTCR = 1 << 8; // Resume transfer
local_irq_restore(intcFlags);
while ((AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXBUFE) == 0) ALLOW_INTERRUPT_LOOP;
dbgu.out_head = dbgu.out_tail; // in case we are interrupted, they may need more space
local_irq_save(intcFlags);
AT91C_BASE_DBGU->DBGU_PTCR = 1 << 9; // Disable transfer
}
AT91C_BASE_DBGU->DBGU_TPR = start;
AT91C_BASE_DBGU->DBGU_TCR = DEBUG_BUFFER_SIZE - dbgu.out_tail;
AT91C_BASE_DBGU->DBGU_TNPR = (unsigned)dbgu.buf;
AT91C_BASE_DBGU->DBGU_TNCR = dbgu.in_head;
dbgu.out_head = dbgu.out_tail;
}
AT91C_BASE_DBGU->DBGU_PTCR = 1 << 8; // Resume transfer
dbgu.out_tail = dbgu.in_head;
dbgu.flush_stack = 0;
local_irq_restore(intcFlags);
}
void dbgu_rb_append(char *data, int len)
{
/* Rules:
* 1) ONLY the LOWEST order of dbgu_rb_append CAN update in_head;
* 2) WHEN updateing in_head, always set it to the current in_tail (since all higher order dbgu_rb_append have completed
* 3) ONLY the LOWEST order of dbgu_rb_append MAY call dbgu_rb_flush
*/
unsigned long intcFlags;
unsigned int append_stack, avail, local_head;
if (len <= 0)
return;
local_irq_save(intcFlags);
append_stack = dbgu.append_stack++;
if (AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXBUFE)
dbgu.out_head = dbgu.out_tail;
avail = (dbgu.out_head - 1 - dbgu.in_tail) & DEBUG_BUFFER_MASK;
local_head = (unsigned)len;
if (local_head > avail) {
local_irq_restore(intcFlags);
while ((AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXBUFE) == 0);
local_irq_save(intcFlags);
while ((AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXBUFE) == 0);
dbgu.out_head = dbgu.out_tail;
avail = (dbgu.out_head - 1 - dbgu.in_tail) & DEBUG_BUFFER_MASK;
if (local_head > avail) {
local_head -= avail;
AT91C_BASE_DBGU->DBGU_TPR = (unsigned)data;
AT91C_BASE_DBGU->DBGU_TCR = local_head;
data += local_head;
len = avail;
}
}
local_head = dbgu.in_tail;
dbgu.in_tail += len;
dbgu.in_tail &= DEBUG_BUFFER_MASK;
local_irq_restore(intcFlags);
if (dbgu.out_head <= local_head) {
// We may have to wrap around: out_head won't change because NO call to flush will be made YET
avail = DEBUG_BUFFER_SIZE - local_head;
if (avail >= (unsigned)len) {
memcpy(dbgu.buf + local_head, data, (size_t)len);
} else {
memcpy(dbgu.buf + local_head, data, (size_t)avail);
memcpy(dbgu.buf, data + avail, (size_t)(len - avail));
}
} else {
memcpy(dbgu.buf + local_head, data, len);
}
local_irq_save(intcFlags);
dbgu.append_stack--;
if (!append_stack)
dbgu.in_head = dbgu.in_tail;
local_irq_restore(intcFlags);
if (!append_stack)
dbgu_rb_flush();
}
static char dbg_buf[256];
static int line_num = 0;
void debugp(const char *format, ...)
{
va_list ap;
va_start(ap, format);
sprintf(dbg_buf, "[%06X] ", line_num++);
vsnprintf(dbg_buf + 9, sizeof(dbg_buf)-10, format, ap);
va_end(ap);
dbg_buf[sizeof(dbg_buf)-1] = '\0';
//AT91F_DBGU_Frame(dbg_buf);
#ifdef DEBUG_UNBUFFERED
AT91F_DBGU_Printk(dbg_buf);
#else
dbgu_rb_append(dbg_buf, strlen(dbg_buf));
#endif
}
#else
void dbgu_rb_flush(void) {}
void dbgu_rb_init(void) {}
#endif
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