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 * Copyright (c) 2009 NVIDIA Corporation.
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 * this list of conditions and the following disclaimer.
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 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
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/** @file
 * @brief <b>NVIDIA Driver Development Kit: Fuse API</b>
 *
 * @b Description: Contains the NvRM chip unique id implementation.
 */
#include "nvassert.h"
#include "nvrm_drf.h"
#include "nvos.h"
#include "nvrm_module.h"
#include "nvrm_hardware_access.h"
#include "nvrm_hwintf.h"
#include "ap20/arclk_rst.h"
#include "ap20/arfuse.h"
#include "ap20/ap20rm_misc_private.h"
#include "ap20rm_clocks.h"

NvError NvRmPrivAp20ChipUniqueId(NvRmDeviceHandle hDevHandle,void* pId)
{
    NvU64*  pOut = (NvU64*)pId; // Pointer to output buffer
    NvU32   OldRegData;                // Old register contents
    NvU32   NewRegData;                // New register contents

    NV_ASSERT(hDevHandle);
    NV_ASSERT(pId);
#if NV_USE_FUSE_CLOCK_ENABLE
    // Enable fuse clock
    Ap20EnableModuleClock(hDevHandle, NvRmModuleID_Fuse, NV_TRUE);
#endif
    // Access to unique id is protected, so make sure all registers visible first.
    OldRegData = NV_REGR(hDevHandle, NvRmPrivModuleID_ClockAndReset, 0, CLK_RST_CONTROLLER_MISC_CLK_ENB_0);
    NewRegData = NV_FLD_SET_DRF_NUM(CLK_RST_CONTROLLER, MISC_CLK_ENB, CFG_ALL_VISIBLE, 1, OldRegData);
    NV_REGW(hDevHandle, NvRmPrivModuleID_ClockAndReset, 0, CLK_RST_CONTROLLER_MISC_CLK_ENB_0, NewRegData);

    // Read the secure id from the fuse registers and copy to the output buffer.
    *pOut = ((NvU64)NV_REGR(hDevHandle, (NvRmPrivModuleID)NvRmModuleID_Fuse, 0, FUSE_JTAG_SECUREID_0_0)) |
            (((NvU64)NV_REGR(hDevHandle, (NvRmPrivModuleID)NvRmModuleID_Fuse, 0, FUSE_JTAG_SECUREID_1_0)) << 32);

    // Restore the protected registers enable to the way we found it.
    NV_REGW(hDevHandle, NvRmPrivModuleID_ClockAndReset, 0, CLK_RST_CONTROLLER_MISC_CLK_ENB_0, OldRegData);
#if NV_USE_FUSE_CLOCK_ENABLE
    // Disable fuse clock
    Ap20EnableModuleClock(hDevHandle, NvRmModuleID_Fuse, NV_FALSE);
#endif
    return NvError_Success;
}