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view src/g23m-aci/aci/ati_fcmisc.c @ 220:0ed36de51973

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ABB semaphore protection overhaul The ABB semaphone protection logic that came with TCS211 from TI was broken in several ways: * Some semaphore-protected functions were called from Application_Initialize() context. NU_Obtain_Semaphore() called with NU_SUSPEND fails with NU_INVALID_SUSPEND in this context, but the return value wasn't checked, and NU_Release_Semaphore() would be called unconditionally at the end. The latter call would increment the semaphore count past 1, making the semaphore no longer binary and thus no longer effective for resource protection. The fix is to check the return value from NU_Obtain_Semaphore() and skip the NU_Release_Semaphore() call if the semaphore wasn't properly obtained. * Some SPI hardware manipulation was being done before entering the semaphore- protected critical section. The fix is to reorder the code: first obtain the semaphore, then do everything else. * In the corner case of L1/DSP recovery, l1_abb_power_on() would call some non-semaphore-protected ABB & SPI init functions. The fix is to skip those calls in the case of recovery. * A few additional corner cases existed, all of which are fixed by making ABB semaphore protection 100% consistent for all ABB functions and code paths. There is still one remaining problem of priority inversion: suppose a low- priority task calls an ABB function, and some medium-priority task just happens to preempt right in the middle of that semaphore-protected ABB operation. Then the high-priority SPI task is locked out for a non-deterministic time until that medium-priority task finishes its work and goes back to sleep. This priority inversion problem remains outstanding for now.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 26 Apr 2021 20:55:25 +0000
parents fa8dc04885d8
children a927f030a4e0
line wrap: on
line source

/*
 * This module implements miscellaneous FreeCalypso-added AT commands.
 */

#ifndef ATI_FCMISC_C
#define ATI_FCMISC_C

#include "aci_all.h"

#include <ctype.h>
#include <string.h>

#include "aci_cmh.h"
#include "ati_cmd.h"
#include "aci_cmd.h"
#include "aci_io.h"
#include "aci_cmd.h"
#include "l4_tim.h"
#include "line_edit.h"
#include "aci_lst.h"

#include "pcm.h"
#include "audio.h"
#include "aci.h"
#include "rx.h"
#include "pwr.h"
#include "l4_tim.h"

#ifdef GPRS
#ifdef DTI
#include "dti.h"
#include "dti_conn_mng.h"
#include "dti_cntrl_mng.h"
#endif /* DTI */
#include "gaci.h"
#include "gaci_cmh.h"
#include "gaci_cmd.h"
#endif  /* GPRS */

#include "aci_mem.h"
#include "aci_prs.h"

#include "ati_int.h"

#ifndef _SIMULATION_
#include "ffs/ffs.h"
#endif

#ifdef FF_ATI_BAT

#include "typedefs.h"
#include "gdd.h"
#include "bat.h"

#include "ati_bat.h"

#endif /*FF_ATI_BAT*/

#include "main/sys_types.h"
#include "fc-target.h"
#include "armio.h"

extern SYS_UWORD8 SIM_allow_speed_enhancement;

/* AT@SPENH - enable or disable SIM speed enhancement */
GLOBAL T_ATI_RSLT atAtSPENH ( char *cl, UBYTE srcId )
{
	int state, nonvol = 0;

	TRACE_FUNCTION("atAtSPENH()");

	cl = parse(cl, "Dd", &state, &nonvol);
	if (!cl)
		return (ATI_FAIL);
	if (state != 0 && state != 1)
		return (ATI_FAIL);
	SIM_allow_speed_enhancement = state;
	if (!nonvol)
		return (ATI_CMPL);
	ffs_mkdir("/etc");
	if (ffs_file_write("/etc/SIM_spenh", &SIM_allow_speed_enhancement, 1,
			   FFS_O_CREATE | FFS_O_TRUNC) == EFFS_OK)
		return (ATI_CMPL);
	else
		return (ATI_FAIL);
}

GLOBAL T_ATI_RSLT queatAtSPENH (char *cl, UBYTE srcId)
{
	char *me="@SPENH: ";

	TRACE_FUNCTION("queatAtSPENH()");

	sprintf(g_sa, "%s%u", me, SIM_allow_speed_enhancement);
	io_sendMessage(srcId, g_sa, ATI_NORMAL_OUTPUT);
	return (ATI_CMPL);
}

#ifdef TARGET_HAS_LPG
/* AT@LPG - program LPG output */
GLOBAL T_ATI_RSLT atAtLPG ( char *cl, UBYTE srcId )
{
	unsigned glob, period = 0, ontime = 0;

	TRACE_FUNCTION("atAtLPG()");

	cl = parse(cl, "Ddd", &glob, &period, &ontime);
	if (!cl)
		return (ATI_FAIL);
	if (glob > 3 || period > 7 || ontime > 7)
		return (ATI_FAIL);
	*(volatile SYS_UWORD8 *)0xFFFE7801 = 0x01;
	*(volatile SYS_UWORD8 *)0xFFFE7800 =
					(glob << 6) | (ontime << 3) | period;
	return (ATI_CMPL);
}

GLOBAL T_ATI_RSLT queatAtLPG (char *cl, UBYTE srcId)
{
	char *me="@LPG: ";
	SYS_UWORD8 regval;
	unsigned glob, period, ontime;

	TRACE_FUNCTION("queatAtLPG()");

	regval = *(volatile SYS_UWORD8 *)0xFFFE7800;
	glob = (regval >> 6) & 3;
	ontime = (regval >> 3) & 7;
	period = regval & 7;
	sprintf(g_sa, "%s%u,%u,%u", me, glob, period, ontime);
	io_sendMessage(srcId, g_sa, ATI_NORMAL_OUTPUT);
	return (ATI_CMPL);
}
#endif	/* TARGET_HAS_LPG */

#ifdef TARGET_HAS_PWL
/* AT@PWL - program PWL output */
GLOBAL T_ATI_RSLT atAtPWL ( char *cl, UBYTE srcId )
{
	unsigned level;

	TRACE_FUNCTION("atAtPWL()");

	cl = parse(cl, "D", &level);
	if (!cl)
		return (ATI_FAIL);
	if (level > 255)
		return (ATI_FAIL);
	*(volatile SYS_UWORD8 *)0xFFFE8000 = level;
	*(volatile SYS_UWORD8 *)0xFFFE8001 = 0x01;
	return (ATI_CMPL);
}

GLOBAL T_ATI_RSLT queatAtPWL (char *cl, UBYTE srcId)
{
	char *me="@PWL: ";
	SYS_UWORD8 regval;

	TRACE_FUNCTION("queatAtPWL()");

	regval = *(volatile SYS_UWORD8 *)0xFFFE8000;
	sprintf(g_sa, "%s%u", me, regval);
	io_sendMessage(srcId, g_sa, ATI_NORMAL_OUTPUT);
	return (ATI_CMPL);
}
#endif	/* TARGET_HAS_PWL */

/* AT+IOR - read GPIO pin */
GLOBAL T_ATI_RSLT atPlusIOR (char *cl, UBYTE srcId)
{
	char *me="+IOR: ";
	unsigned ionum;
	int state;

	TRACE_FUNCTION("atPlusIOR()");

	cl = parse(cl, "D", &ionum);
	if (!cl)
		return (ATI_FAIL);
	if (ionum > 13)
		return (ATI_FAIL);
	state = AI_ReadBit(ionum);
	sprintf(g_sa, "%s%u,%d", me, ionum, state);
	io_sendMessage(srcId, g_sa, ATI_NORMAL_OUTPUT);
	return (ATI_CMPL);
}

/* AT+IOW - set GPIO pin */
GLOBAL T_ATI_RSLT atPlusIOW (char *cl, UBYTE srcId)
{
	unsigned ionum;
	int state;

	TRACE_FUNCTION("atPlusIOW()");

	cl = parse(cl, "DD", &ionum, &state);
	if (!cl)
		return (ATI_FAIL);
	if (ionum > 13)
		return (ATI_FAIL);
	if (state)
		AI_SetBit(ionum);
	else
		AI_ResetBit(ionum);
	return (ATI_CMPL);
}

#endif /* ATI_FCMISC_C */