/*******************************************************************************
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********************************************************************************
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   modify this File under the following licensing terms.
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   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
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*   Neither the name of Marvell 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 "mv_os.h"
#include "mvSysEnvLib.h"
#include "bin_hdr_twsi.h"
#include "mvUart.h"
#include "util.h"
#include "mvCtrlPex.h"

#ifdef REGISTER_TRACE_DEBUG
static MV_U32 _MV_REG_READ(MV_U32 regAddr)
{
	putstring("\n >>>       MV_REG_READ.  regAddr=0x");
	putdata(INTER_REGS_BASE | (regAddr), 8);
	putstring(" regData=0x");
	MV_U32 regData = MV_MEMIO_LE32_READ((INTER_REGS_BASE | (regAddr)));
	putdata(regData, 8);

	return regData;
}

static MV_VOID _MV_REG_WRITE(MV_U32 regAddr, MV_U32 regData)
{
	putstring("\n >>>       MV_REG_WRITE. regAddr=0x");
	putdata(INTER_REGS_BASE | (regAddr), 8);
	putstring(" regData=0x");
	putdata(regData, 8);
	MV_MEMIO_LE32_WRITE((INTER_REGS_BASE | (regAddr)), (regData));
}
#undef MV_REG_WRITE
#undef MV_REG_READ

#define MV_REG_WRITE    _MV_REG_WRITE
#define MV_REG_READ     _MV_REG_READ
#endif /*REGISTER_TRACE_DEBUG*/

/************************ Local functions declarations ************************/

/**************************************************************************
 * mvPexLocalBusNumSet -
 *
 * DESCRIPTION:          Sets PEX interface local bus number
 *                       Note: In case the PEX interface is PEX-X,
 *                       the information is read-only.
 * INPUT:                pexIf           - PEX interface number.
 *                       busNum          - Bus number.
 * OUTPUT:               None.
 * RETURNS:              MV_OK           -   for success
 *                       MV_BAD_PARAM    -   when recieving a bad busNum
 ***************************************************************************/
MV_STATUS mvPexLocalBusNumSet
(
	MV_U32 pexIf,
	MV_U32 busNum
);

/**************************************************************************
 * mvPexLocalBusNumSet -
 *
 * DESCRIPTION:          Set PEX interface local device number.
 *                       Note: In case the PEX interface is PEX-X,
 *                       the information is read-only.
 * INPUT:                pexIf           -   PEX interface number.
 *                       devNum          -   Device number.
 * OUTPUT:               None.
 * RETURNS:              MV_OK           -   for success
 ***************************************************************************/
MV_STATUS mvPexLocalDevNumSet
(
	MV_U32 pexIf,
	MV_U32 devNum
);

/*******************************************************************************
* mvPexConfigRead -
*
* DESCRIPTION:          Performs a 32 bit read from PEX configuration space.
*                       It supports both type 0 and type 1 of Configuration
*                       Transactions (local and over bridge).
*                       In order to read from local bus segment, uses
*                       bus number retrieved from mvPexLocalBusNumGet().
*                       Other bus numbers will result configuration
*                       transaction of type 1 (over bridge).*
* INPUT:                pexIf           -   PEX interface number.
*                       bus             -   PEX segment bus number.
*                       dev             -   PEX device number.
*                       func            -   Function number.
*                       regOffs         -   Register offset.
*                       regData         -   The data that will be returned as output
* RETURNS:               32bit register data, 0xffffffff on error
*******************************************************************************/
MV_U32 mvPexConfigRead
(
	MV_U32 pexIf,
	MV_U32 bus,
	MV_U32 dev,
	MV_U32 func,
	MV_U32 regOff
);

/************************** Functions implementation **************************/

/***************************************************************************/
MV_STATUS mvHwsPexConfig(SERDES_MAP *serdesMap)
{
	MV_U32 pexIdx, tmp, next_busno, first_busno, tempPexReg, tempReg, addr, devId, ctrlMode;
	SERDES_TYPE serdesType;
	MV_U32 serdesIdx, maxLaneNum;

	DEBUG_INIT_FULL_S("\n### mvHwsPexConfig ###\n");

	maxLaneNum = mvHwsSerdesGetMaxLane();
	for (serdesIdx = 0; serdesIdx < maxLaneNum; serdesIdx++) {
		serdesType = serdesMap[serdesIdx].serdesType;
		/* configuration for PEX only */
		if ((serdesType != PEX0) && (serdesType != PEX1) && (serdesType != PEX2) && (serdesType != PEX3))
			continue;

		if ((serdesIdx != 0) &&
				((serdesMap[serdesIdx].serdesMode == PEX_ROOT_COMPLEX_x4) ||
				 (serdesMap[serdesIdx].serdesMode == PEX_END_POINT_x4)))
		{
			/* for PEX by4 - relevant for the first port only */
			continue;
		}

		pexIdx = serdesType - PEX0;
		tmp = MV_REG_READ(PEX_CAPABILITIES_REG(pexIdx));
		tmp &= ~(0xf << 20);
		tmp |= (0x4 << 20);
		MV_REG_WRITE(PEX_CAPABILITIES_REG(pexIdx), tmp);
	}

	tmp = MV_REG_READ(SOC_CTRL_REG);
	tmp &= ~(0x03);

	for (serdesIdx = 0; serdesIdx < maxLaneNum; serdesIdx++) {
		serdesType = serdesMap[serdesIdx].serdesType;
		if ((serdesIdx != 0) &&
				((serdesMap[serdesIdx].serdesMode == PEX_ROOT_COMPLEX_x4) ||
				 (serdesMap[serdesIdx].serdesMode == PEX_END_POINT_x4)))
		{
			/* for PEX by4 - relevant for the first port only */
			continue;
		}
		switch (serdesType) {
		case PEX0:
			tmp |= 0x1 << PCIE0_ENABLE_OFFS;
			break;
		case PEX1:
			tmp |= 0x1 << PCIE1_ENABLE_OFFS;
			break;
		case PEX2:
			tmp |= 0x1 << PCIE2_ENABLE_OFFS;
			break;
		case PEX3:
			tmp |= 0x1 << PCIE3_ENABLE_OFFS;
			break;
		default:
			break;

		}
	}

	MV_REG_WRITE(SOC_CTRL_REG, tmp);

	/* support gen1/gen2 */
	DEBUG_INIT_FULL_S("Support gen1/gen2\n");
	next_busno = 0;
#ifndef WIN32
	mvOsDelay(150);
#endif
	for (serdesIdx = 0; serdesIdx < maxLaneNum; serdesIdx++) {
		serdesType = serdesMap[serdesIdx].serdesType;
		DEBUG_INIT_FULL_S(" serdesType=0x");
		DEBUG_INIT_FULL_D(serdesType, 8);
		DEBUG_INIT_FULL_S("\n");
		DEBUG_INIT_FULL_S(" serdesIdx=0x");
		DEBUG_INIT_FULL_D(serdesIdx, 8);
		DEBUG_INIT_FULL_S("\n");

		/* configuration for PEX only */
		if ((serdesType != PEX0) && (serdesType != PEX1) && (serdesType != PEX2) && (serdesType != PEX3))
			continue;

		if ((serdesIdx != 0) &&
				((serdesMap[serdesIdx].serdesMode == PEX_ROOT_COMPLEX_x4) ||
				 (serdesMap[serdesIdx].serdesMode == PEX_END_POINT_x4)))
		{
			/* for PEX by4 - relevant for the first port only */
			continue;
		}

		pexIdx = serdesType - PEX0;
		tmp = MV_REG_READ(PEX_DBG_STATUS_REG(pexIdx));

		first_busno = next_busno;
		if ((tmp & 0x7f) == 0x7E) {
			next_busno++;
			tempPexReg = MV_REG_READ((PEX_CFG_DIRECT_ACCESS(pexIdx, PEX_LINK_CAPABILITY_REG)));
			tempPexReg &= (0xF);
			if (tempPexReg == 0x2) {
				tempReg = (MV_REG_READ(PEX_CFG_DIRECT_ACCESS(pexIdx, PEX_LINK_CTRL_STAT_REG)) & 0xF0000) >> 16;

				/* check if the link established is GEN1 */
				DEBUG_INIT_FULL_S("Checking if the link established is gen1\n");
				if (tempReg == 0x1) {
					mvPexLocalBusNumSet(pexIdx, first_busno);
					mvPexLocalDevNumSet(pexIdx, 1);
					DEBUG_INIT_FULL_S("PCIe, Idx ");
					DEBUG_INIT_FULL_D(pexIdx, 1);

					DEBUG_INIT_S(":** Link is Gen1, check the EP capability \n");
					/* link is Gen1, check the EP capability */
					addr = mvPexConfigRead(pexIdx, first_busno, 0, 0, 0x34) & 0xFF;
					DEBUG_INIT_FULL_C("mvPexConfigRead: return addr=0x%x", addr, 4);
					if (addr == 0xff) {
						DEBUG_INIT_FULL_C("mvPexConfigRead: return 0xff -->PCIe (%d): Detected No Link.", pexIdx, 1);
						continue;
					}
					while ((mvPexConfigRead(pexIdx, first_busno, 0, 0, addr) & 0xFF) != 0x10)
						addr = (mvPexConfigRead(pexIdx, first_busno, 0, 0, addr) & 0xFF00) >> 8;
					/* check for Gen2 and above */
					if ((mvPexConfigRead(pexIdx, first_busno, 0, 0, addr + 0xC) & 0xF) >= 0x2) {
						tmp = MV_REG_READ(PEX_LINK_CTRL_STATUS2_REG(pexIdx));
						DEBUG_RD_REG(PEX_LINK_CTRL_STATUS2_REG(pexIdx), tmp);
						tmp &= ~(BIT0 | BIT1);
						tmp |= BIT1;
						tmp |= BIT6; /* Select Deemphasize (-3.5dB) */
						MV_REG_WRITE(PEX_LINK_CTRL_STATUS2_REG(pexIdx), tmp);
						DEBUG_WR_REG(PEX_LINK_CTRL_STATUS2_REG(pexIdx), tmp);

						tmp = MV_REG_READ(PEX_CTRL_REG(pexIdx));
						DEBUG_RD_REG(PEX_CTRL_REG(pexIdx), tmp);
						tmp |= BIT10;
						MV_REG_WRITE(PEX_CTRL_REG(pexIdx), tmp);
						DEBUG_WR_REG(PEX_CTRL_REG(pexIdx), tmp);
						mvOsUDelay(10000); /* We need to wait 10ms before reading the PEX_DBG_STATUS_REG in order not to read the status of the former state*/

						DEBUG_INIT_S("PCIe, Idx ");
						DEBUG_INIT_D(pexIdx, 1);
						DEBUG_INIT_S(": Link upgraded to Gen2 based on client cpabilities \n");
					} else {
						DEBUG_INIT_S("PCIe, Idx ");
						DEBUG_INIT_D(pexIdx, 1);
						DEBUG_INIT_S(": remains Gen1\n");
					}
				}
			}
		}else {
			DEBUG_INIT_S("PCIe, Idx ");
			DEBUG_INIT_D(pexIdx, 1);
			DEBUG_INIT_S(": detected no link\n");
		}
	}

	/* update pex DEVICE ID*/
	ctrlMode = mvSysEnvModelGet();

	for (serdesIdx = 0; serdesIdx < maxLaneNum; serdesIdx++) {
		serdesType = serdesMap[serdesIdx].serdesType;
		/* configuration for PEX only */
		if ((serdesType != PEX0) && (serdesType != PEX1) && (serdesType != PEX2) && (serdesType != PEX3))
			continue;

		if ((serdesIdx != 0) &&
				((serdesMap[serdesIdx].serdesMode == PEX_ROOT_COMPLEX_x4) ||
				 (serdesMap[serdesIdx].serdesMode == PEX_END_POINT_x4)))
		{
			/* for PEX by4 - relevant for the first port only */
			continue;
		}

		pexIdx = serdesType - PEX0;
		devId = MV_REG_READ(PEX_CFG_DIRECT_ACCESS(pexIdx, PEX_DEVICE_AND_VENDOR_ID));
		devId &= 0xFFFF;
		devId |= ((ctrlMode << 16) & 0xFFFF0000);
		MV_REG_WRITE(PEX_CFG_DIRECT_ACCESS(pexIdx, PEX_DEVICE_AND_VENDOR_ID), devId);
	}
	DEBUG_INIT_FULL_C("Update PEX Device ID ", ctrlMode, 4);

	return MV_OK;
}

/***************************************************************************/
MV_STATUS mvPexLocalBusNumSet(MV_U32 pexIf, MV_U32 busNum)
{
	MV_U32 pexStatus;

	DEBUG_INIT_FULL_S("\n### mvPexLocalBusNumSet ###\n");

	if (busNum >= MAX_PEX_BUSSES) {
		DEBUG_INIT_C("mvPexLocalBusNumSet: Illegal bus number %d\n", busNum, 4);
		return MV_BAD_PARAM;
	}

	pexStatus = MV_REG_READ(PEX_STATUS_REG(pexIf));
	pexStatus &= ~PXSR_PEX_BUS_NUM_MASK;
	pexStatus |= (busNum << PXSR_PEX_BUS_NUM_OFFS) & PXSR_PEX_BUS_NUM_MASK;
	MV_REG_WRITE(PEX_STATUS_REG(pexIf), pexStatus);

	return MV_OK;
}

/***************************************************************************/
MV_STATUS mvPexLocalDevNumSet
(
	MV_U32 pexIf,
	MV_U32 devNum
)
{
	MV_U32 pexStatus;

	DEBUG_INIT_FULL_S("\n### mvPexLocalDevNumSet ###\n");

	pexStatus = MV_REG_READ(PEX_STATUS_REG(pexIf));
	pexStatus &= ~PXSR_PEX_DEV_NUM_MASK;
	pexStatus |= (devNum << PXSR_PEX_DEV_NUM_OFFS) & PXSR_PEX_DEV_NUM_MASK;
	MV_REG_WRITE(PEX_STATUS_REG(pexIf), pexStatus);

	return MV_OK;
}

/*******************************************************************************
* mvPexConfigRead - Read from configuration space
*
* DESCRIPTION:
*       This function performs a 32 bit read from PEX configuration space.
*       It supports both type 0 and type 1 of Configuration Transactions
*       (local and over bridge). In order to read from local bus segment, use
*       bus number retrieved from mvPexLocalBusNumGet(). Other bus numbers
*       will result configuration transaction of type 1 (over bridge).
*
* INPUT:
*       pexIf   - PEX interface number.
*       bus     - PEX segment bus number.
*       dev     - PEX device number.
*       func    - Function number.
*       regOffs - Register offset.
*
* OUTPUT:
*       None.
*
* RETURN:
*       32bit register data, 0xffffffff on error
*
*******************************************************************************/
MV_U32 mvPexConfigRead(MV_U32 pexIf, MV_U32 bus, MV_U32 dev, MV_U32 func, MV_U32 regOff)
{
	MV_U32 pexData = 0;
	MV_U32 localDev, localBus;
	MV_U32 pexStatus;

	pexStatus = MV_REG_READ(PEX_STATUS_REG(pexIf));

	localDev = ((pexStatus & PXSR_PEX_DEV_NUM_MASK) >> PXSR_PEX_DEV_NUM_OFFS);
	localBus = ((pexStatus & PXSR_PEX_BUS_NUM_MASK) >> PXSR_PEX_BUS_NUM_OFFS);

	/* in PCI Express we have only one device number */
	/* and this number is the first number we encounter
	   else that the localDev */
	/* spec pex define return on config read/write on any device */
	if (bus == localBus) {
		if (localDev == 0) {
			/* if local dev is 0 then the first number we encounter
			   after 0 is 1 */
			if ((dev != 1) && (dev != localDev))
				return MV_ERROR;
		} else {
			/* if local dev is not 0 then the first number we encounter
			   is 0 */

			if ((dev != 0) && (dev != localDev))
				return MV_ERROR;
		}
	}
	/* Creating PEX address to be passed */
	pexData = (bus << PXCAR_BUS_NUM_OFFS);
	pexData |= (dev << PXCAR_DEVICE_NUM_OFFS);
	pexData |= (func << PXCAR_FUNC_NUM_OFFS);
	pexData |= (regOff & PXCAR_REG_NUM_MASK); /* lgacy register space */
	/* extended register space */
	pexData |= (((regOff & PXCAR_REAL_EXT_REG_NUM_MASK) >>
		     PXCAR_REAL_EXT_REG_NUM_OFFS) << PXCAR_EXT_REG_NUM_OFFS);

	pexData |= PXCAR_CONFIG_EN;

	/* Write the address to the PEX configuration address register */
	MV_REG_WRITE(PEX_CFG_ADDR_REG(pexIf), pexData);

	/* In order to let the PEX controller absorbed the address of the read  */
	/* transaction we perform a validity check that the address was written */
	if (pexData != MV_REG_READ(PEX_CFG_ADDR_REG(pexIf)))
		return MV_ERROR;

	/* cleaning Master Abort */
	MV_REG_BIT_SET(PEX_CFG_DIRECT_ACCESS(pexIf, PEX_STATUS_AND_COMMAND), PXSAC_MABORT);
	/* Read the Data returned in the PEX Data register */
	pexData = MV_REG_READ(PEX_CFG_DATA_REG(pexIf));

	DEBUG_INIT_FULL_C(" --> ", pexData, 4);

	return pexData;

}

/***************************************************************************/