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/*
*
* @Component OMAPCONF
* @Filename stm44xx.c
* @Description OMAP4 STM configuration & control functions
* @Author Patrick Titiano (p-titiano@ti.com)
* @Date 2011
* @Copyright Texas Instruments Incorporated
*
*
* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* Neither the name of Texas Instruments Incorporated nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/


#include <stm44xx.h>
#include <emu44xx.h>
#include <coresight44xx.h>
#include <lib.h>
#include <lib44xx.h>
#include <mem.h>
#include <stdio.h>


/* #define STM_OMAP4_DEBUG */
#ifdef STM_OMAP4_DEBUG
#define dprintf(format, ...) printf(format, ## __VA_ARGS__)
#else
#define dprintf(format, ...)
#endif

static const reg_table omap4_stm_reg_table[18] = {
{"STM_SYSCONFIG", OMAP4430_STM_SYSCONFIG},
{"STM_SYSSTATUS", OMAP4430_STM_SYSSTATUS},
{"STM_SWMCTRL0", OMAP4430_STM_SWMCTRL0},
{"STM_SWMCTRL1", OMAP4430_STM_SWMCTRL1},
{"STM_SWMCTRL2", OMAP4430_STM_SWMCTRL2},
{"STM_SWMCTRL3", OMAP4430_STM_SWMCTRL3},
{"STM_SWMCTRL4", OMAP4430_STM_SWMCTRL4},
{"STM_HWMCTRL", OMAP4430_STM_HWMCTRL},
{"PTI_CONFIG", OMAP4430_PTI_CONFIG},
{"PTI_COUNTD", OMAP4430_PTI_COUNTD},
{"ATB_CONFIG", OMAP4430_ATB_CONFIG},
{"ATB_POINTER", OMAP4430_ATB_POINTER},
{"ATB_ID", OMAP4430_ATB_ID},
{"STM_CTS", OMAP4430_STM_CTS},
{"STM_CTC", OMAP4430_STM_CTC},
{"STM_LOCK", OMAP4430_STM_LOCK},
{"STM_LOCK_STS", OMAP4430_STM_LOCK_STS},
{"END", 0} };


/* ------------------------------------------------------------------------*//**
* @FUNCTION stm_claim_ownership
* @BRIEF claim STM ownership in order to be able to R/W registers.
* @RETURNS 0 in case of success
* OMAPCONF_ERR_NOT_AVAILABLE
* @DESCRIPTION claim STM ownership in order to be able to R/W registers.
* NB: must be called before any other access to STM
* registers.
* NB: make sure EMU domain is ON before calling this
* function.
*//*------------------------------------------------------------------------ */
int stm_claim_ownership(void)
{
if (!emu44xx_is_enabled()) {
printf("stm_claim_ownership(): "
"trying to enable ETB but EMU domain OFF!!!\n");
return OMAPCONF_ERR_NOT_AVAILABLE;
}

if (stm_is_claimed()) {
printf("stm_claim_ownership(): STM already claimed!\n");
return OMAPCONF_ERR_NOT_AVAILABLE;
}

/* Unlock STM write access */
mem_write(OMAP4430_STM_LOCK, OMAP4_CORESIGHT_UNLOCK_VALUE);
/* Claim ownership */
mem_write(OMAP4430_STM_SWMCTRL0, 0x40000000);
/* Enable ownership */
mem_write(OMAP4430_STM_SWMCTRL0, 0x80000000);

dprintf("stm_claim_ownership(): STM claimed.\n");
return 0;
}


/* ------------------------------------------------------------------------*//**
* @FUNCTION stm_is_claimed
* @BRIEF check if STM is claimed, i.e. registers accessible.
* @RETURNS 0 STM not accessible
* !=0 STM accessible
* @DESCRIPTION check if STM is claimed, i.e. registers accessible.
* NB: make sure EMU domain is ON before calling this
* function.
*//*------------------------------------------------------------------------ */
int stm_is_claimed(void)
{
unsigned int stm_swmctrl0;

if (!emu44xx_is_enabled())
return 0;

mem_read(OMAP4430_STM_SWMCTRL0, &stm_swmctrl0);

return ((stm_swmctrl0 & 0xC0000000) == 0x80000000);
}


/* ------------------------------------------------------------------------*//**
* @FUNCTION stm_release_ownership
* @BRIEF release STM ownership.
* @RETURNS 0 in case of success
* OMAPCONF_ERR_NOT_AVAILABLE
* OMAPCONF_ERR_INTERNAL
* @DESCRIPTION release STM ownership.
* NB: must be called at end of STM use.
* NB: make sure EMU domain is ON before calling this
* function.
*//*------------------------------------------------------------------------ */
int stm_release_ownership(void)
{
if (!emu44xx_is_enabled()) {
printf("stm_release_ownership(): "
"trying to enable ETB but EMU domain OFF!!!\n");
return OMAPCONF_ERR_NOT_AVAILABLE;
}

if (!stm_is_claimed()) {
printf("stm_release_ownership(): STM not claimed!\n");
return OMAPCONF_ERR_INTERNAL;
}

/* Release ownership */
mem_write(OMAP4430_STM_SWMCTRL0, 0x00000000);

dprintf("stm_release_ownership(): STM released.\n");
return 0;
}


/* ------------------------------------------------------------------------*//**
* @FUNCTION stm_dump_regs
* @BRIEF dump STM registers
* @RETURNS 0 in case of success
* OMAPCONF_ERR_NOT_AVAILABLE
* @DESCRIPTION dump STM registers
*//*------------------------------------------------------------------------ */
int stm_dump_regs(void)
{
if (!emu44xx_is_enabled()) {
printf("stm_dump_regs(): "
"trying to enable ETB but EMU domain OFF!!!\n");
return OMAPCONF_ERR_NOT_AVAILABLE;
}

if (!stm_is_claimed()) {
printf("stm_dump_regs(): STM not claimed!\n");
return OMAPCONF_ERR_INTERNAL;
}

return dumpregs((reg_table *) omap4_stm_reg_table);
}


/* ------------------------------------------------------------------------*//**
* @FUNCTION stm_hw_master_enable
* @BRIEF enable stm hw master
* @RETURNS 0 in case of success
* OMAPCONF_ERR_NOT_AVAILABLE
* OMAPCONF_ERR_INTERNAL
* OMAPCONF_ERR_ARG
* @param[in] hwmid: hw master ID
* @param[in] pos: register position
* @DESCRIPTION enable stm hw master
*//*------------------------------------------------------------------------ */
int stm_hw_master_enable(stm_hw_masters hwmid, unsigned char pos)
{
unsigned int stm_hwmctrl, mask;

if (!emu44xx_is_enabled()) {
printf("stm_hw_master_enable(): "
"trying to enable ETB but EMU domain OFF!!!\n");
return OMAPCONF_ERR_NOT_AVAILABLE;
}
if (!stm_is_claimed()) {
printf("stm_hw_master_enable(): STM not claimed!\n");
return OMAPCONF_ERR_INTERNAL;
}
if (hwmid >= HW_MASTER_MAX) {
printf("stm_hw_master_enable(): "
"hwmid (0x%02X) >= HW_MASTER_MAX!\n", hwmid);
return OMAPCONF_ERR_ARG;
}
if (pos > 3) {
printf("stm_hw_master_enable(): "
"pos (%d) > 3!\n", pos);
return OMAPCONF_ERR_ARG;
}

mem_read(OMAP4430_STM_HWMCTRL, &stm_hwmctrl);
pos = 2 + (8 * pos);
mask = ~(0x1F << pos);
stm_hwmctrl &= mask;
stm_hwmctrl |= hwmid << pos;
mem_write(OMAP4430_STM_HWMCTRL, stm_hwmctrl);

return 0;
}


/* ------------------------------------------------------------------------*//**
* @FUNCTION stm_hw_master_disable
* @BRIEF disable stm hw master
* @RETURNS 0 in case of success
* OMAPCONF_ERR_NOT_AVAILABLE
* OMAPCONF_ERR_INTERNAL
* OMAPCONF_ERR_ARG
* @param[in] pos: register position
* @DESCRIPTION disable stm hw master
*//*------------------------------------------------------------------------ */
int stm_hw_master_disable(unsigned char pos)
{
unsigned int stm_hwmctrl, mask;

if (!emu44xx_is_enabled()) {
printf("stm_hw_master_disable(): "
"trying to enable ETB but EMU domain OFF!!!\n");
return OMAPCONF_ERR_NOT_AVAILABLE;
}
if (!stm_is_claimed()) {
printf("stm_hw_master_disable(): STM not claimed!\n");
return OMAPCONF_ERR_INTERNAL;
}
if (pos > 3) {
printf("stm_hw_master_disable(): pos (%d) > 3!\n", pos);
return OMAPCONF_ERR_ARG;
}

mem_read(OMAP4430_STM_HWMCTRL, &stm_hwmctrl);
pos = 2 + (8 * pos);
mask = ~(0x1F << pos);
stm_hwmctrl &= mask;
mem_write(OMAP4430_STM_HWMCTRL, stm_hwmctrl);

return 0;
}


/* ------------------------------------------------------------------------*//**
* @FUNCTION stm_atb_capture_enable
* @BRIEF enable STM trace to be captured in ETB via ATB
* @RETURNS 0 in case of success
* OMAPCONF_ERR_NOT_AVAILABLE
* @DESCRIPTION enable STM trace to be captured in ETB via ATB
* NB: make sure EMU domain is ON before calling this
* function.
*//*------------------------------------------------------------------------ */
int stm_atb_capture_enable(void)
{
if (!emu44xx_is_enabled()) {
printf("stm_atb_capture_enable(): "
"trying to enable ETB but EMU domain OFF!!!\n");
return OMAPCONF_ERR_NOT_AVAILABLE;
}
if (!stm_is_claimed()) {
printf("stm_atb_capture_enable(): STM not claimed!\n");
return OMAPCONF_ERR_INTERNAL;
}

mem_write(OMAP4430_ATB_CONFIG, 0x00010000);

#ifdef STM_OMAP4_DEBUG
printf("stm_atb_capture_enable(): ATB capture enabled.\n");
dumpregs((reg_table *) omap4_stm_reg_table);
#endif

return 0;
}


/* ------------------------------------------------------------------------*//**
* @FUNCTION stm_atb_capture_disable
* @BRIEF disable STM trace capture in ETB via ATB
* @RETURNS 0 in case of success
* OMAPCONF_ERR_NOT_AVAILABLE
* @DESCRIPTION disable STM trace capture in ETB via ATB
* NB: make sure EMU domain is ON before calling this
* function.
* NB: blocking until STM FIFO is empty
*//*------------------------------------------------------------------------ */
int stm_atb_capture_disable(void)
{
unsigned int stm_sysstatus;

if (!emu44xx_is_enabled()) {
printf("stm_atb_capture_disable(): EMU domain OFF!!!\n");
return OMAPCONF_ERR_NOT_AVAILABLE;
}
if (!stm_is_claimed()) {
printf("stm_atb_capture_disable(): STM not claimed!\n");
return OMAPCONF_ERR_INTERNAL;
}

do {
mem_read(OMAP4430_STM_SYSSTATUS, &stm_sysstatus);
} while (stm_sysstatus != 0x00000101);
dprintf("stm_atb_capture_disable(): STM FIFO empty.\n");

/* Disable ATB */
mem_write(OMAP4430_ATB_CONFIG, 0x00000000);

dprintf("stm_atb_capture_disable(): ATB capture disabled.\n");

#ifdef STM_OMAP4_DEBUG
stm_last_header_pos_get();
stm_dump_regs();
#endif

return 0;
}


/* ------------------------------------------------------------------------*//**
* @FUNCTION stm_last_header_pos_get
* @BRIEF return the position of the last STP header in the last
* 32-bit ATB word stored
* @RETURNS >=0 STP header position
* <8 STP header is in the last ETB entry
* >=8 STP header is in the (last -1) ETB entry
* OMAPCONF_ERR_NOT_AVAILABLE
* OMAPCONF_ERR_INTERNAL
* @DESCRIPTION return the position of the last STP header in the last
* 32-bit ATB word stored
* NB: make sure EMU domain is ON before calling this
* function.
*//*------------------------------------------------------------------------ */
int stm_last_header_pos_get(void)
{
unsigned int atb_pointer;

if (!emu44xx_is_enabled()) {
printf("stm_atb_capture_disable(): "
"trying to enable ETB but EMU domain OFF!!!\n");
return OMAPCONF_ERR_INTERNAL;
}
if (!stm_is_claimed()) {
printf("stm_atb_capture_disable(): STM not claimed!\n");
return OMAPCONF_ERR_INTERNAL;
}

mem_read(OMAP4430_ATB_POINTER, &atb_pointer);
dprintf("stm_last_header_pos_get(): atb_pointer = 0x%08X\n",
atb_pointer);
if ((atb_pointer & 0x00000008) == 0x00000008) {
dprintf("stm_last_header_pos_get(): "
"STP Header pos = %d in last ETB entry\n",
atb_pointer & 0x00000007);
return (atb_pointer & 0x00000007);
} else if ((atb_pointer & 0x00000080) == 0x00000080) {
dprintf("stm_last_header_pos_get(): "
"STP Header pos = %d in (last -1) ETB entry\n",
8 + ((atb_pointer & 0x00000070) >> 4));
return (8 + ((atb_pointer & 0x00000070) >> 4));

} else {
dprintf("stm_last_header_pos_get(): no STP Header present!\n");
return OMAPCONF_ERR_NOT_AVAILABLE;
}
}


/* ------------------------------------------------------------------------*//**
* @FUNCTION stm_atb_prescaler_set
* @BRIEF set ATB local timestamp reference clock prescaler
* @RETURNS 0 in case of success
* OMAPCONF_ERR_ARG
* OMAPCONF_ERR_NOT_AVAILABLE
* @param[in] div: prescaler (must be power of 2 and <= 128)
* @DESCRIPTION set ATB local timestamp reference clock prescaler
* NB: make sure EMU domain is ON before calling this
* function.
*//*------------------------------------------------------------------------ */
int stm_atb_prescaler_set(unsigned char div)
{
unsigned int atb_config, i;

if (!emu44xx_is_enabled()) {
printf("stm_atb_prescaler_set(): EMU domain OFF!!!\n");
return OMAPCONF_ERR_NOT_AVAILABLE;
}
if (!stm_is_claimed()) {
printf("stm_atb_prescaler_set(): STM not claimed!\n");
return OMAPCONF_ERR_NOT_AVAILABLE;
}

for (i = 0; i < 8; i++) {
if (div == (1 << i)) {
dprintf("div=%d => i=%d\n", div, i);
mem_read(OMAP4430_ATB_CONFIG, &atb_config);
atb_config &= 0xFFFFFFF8;
atb_config |= i;
dprintf("atb_config=0x%08X\n", atb_config);
mem_write(OMAP4430_ATB_CONFIG, atb_config);
return 0;
}
}

printf("stm_atb_prescaler_set(): div (%d) must be "
"power of 2 and <= 128!\n", div);
return OMAPCONF_ERR_ARG;
}


/* ------------------------------------------------------------------------*//**
* @FUNCTION stm_atb_prescaler_get
* @BRIEF return ATB local timestamp reference clock prescaler
* @RETURNS >0 prescaler value
* OMAPCONF_ERR_ARG
* OMAPCONF_ERR_NOT_AVAILABLE
* @DESCRIPTION return ATB local timestamp reference clock prescaler
* NB: make sure EMU domain is ON before calling this
* function.
*//*------------------------------------------------------------------------ */
int stm_atb_prescaler_get(void)
{
unsigned int atb_config;

if (!emu44xx_is_enabled()) {
printf("stm_atb_prescaler_get(): "
"trying to enable ETB but EMU domain OFF!!!\n");
return OMAPCONF_ERR_NOT_AVAILABLE;
}
if (!stm_is_claimed()) {
printf("stm_atb_prescaler_get(): STM not claimed!\n");
return OMAPCONF_ERR_NOT_AVAILABLE;
}

mem_read(OMAP4430_ATB_CONFIG, &atb_config);
atb_config &= 0x00000007;
dprintf("stm_atb_prescaler_get(): "
"(atb_config & 0x00000007)=0x%08X, div=%d\n",
atb_config, 1 << atb_config);
return (1 << atb_config);
}
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