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

#define MV_ASMLANGUAGE
#include "mvCommon.h"
#include "mvOsAsm.h"
#include "ctrlEnv/mvCtrlEnvSpec.h"
#include "mvDeviceId.h"
#include "mvCtrlEnvRegs.h"
#include "mvCpuIfRegs.h"
#include "mvCtrlEnvAsm.h"


/*******************************************************************************
* mvCpuIfPreInit - Make early initialization of CPU interface.
*
* DESCRIPTION:
*       The function will initialize the CPU interface parameters that must
*       be initialize before any BUS activity towards the DDR interface,
*       which means it must be executed from ROM. Because of that, the function
*       is implemented in assembly code.
*       The function configure the following CPU config register parameters:
*       1) CPU2MbusLTickDrv
*       2) CPU2MbusLTickSample.
*       NOTE: This function must be called AFTER the internal register
*       base is modified to INTER_REGS_BASE.
*
* INPUT:
*       None.
*
* OUTPUT:
*       None.
*
* RETURN:
*       None.
*
*       r11 holds return function address.
*******************************************************************************/
#define MV88F6281_PCKG_OPT	2
#define MV88F6192_PCKG_OPT	1
#define MV88F6180_PCKG_OPT	0

	.globl _mvCpuIfPreInit
_mvCpuIfPreInit:

	mov     r11, LR     		/* Save link register */
	b       done
#if 0
	/* Read device ID  */
	MV_CTRL_MODEL_GET_ASM(r4, r5);

	/* goto calcConfigReg if device is 6281/6282 */
	ldr     r5, =MV88F6281_PCKG_OPT
	cmp     r4, r5
	beq     calcConfigReg

	/* goto calcConfigReg if device is 6192/6190 */
	ldr     r5, =MV88F6192_PCKG_OPT
	cmp     r4, r5
	beq     calcConfigReg

	/* Else 6180 */
	/* Get the "sample on reset" register */
	MV_REG_READ_ASM (r4, r5, MPP_SAMPLE_AT_RESET)
	ldr    r5, =MSAR_CPUCLCK_MASK_6180
	and    r5, r4, r5
	mov    r5, r5, lsr #MSAR_CPUCLCK_OFFS_6180

	ldr    r4, =CPU_2_MBUSL_DDR_CLK_1x3
	cmp    r5, #CPU_2_DDR_CLK_1x3_1
	beq    setConfigReg

	ldr    r4, =CPU_2_MBUSL_DDR_CLK_1x4
	cmp    r5, #CPU_2_DDR_CLK_1x4_1
	beq    setConfigReg
	b    setConfigReg

calcConfigReg:
	/* Get the "sample on reset" register */
	MV_REG_READ_ASM (r4, r5, MPP_SAMPLE_AT_RESET)
	ldr    r5, =MSAR_DDRCLCK_RTIO_MASK
	and    r5, r4, r5
	mov    r5, r5, lsr #MSAR_DDRCLCK_RTIO_OFFS

	ldr    r4, =CPU_2_MBUSL_DDR_CLK_1x3
	cmp    r5, #CPU_2_DDR_CLK_1x3
	beq    setConfigReg

	ldr    r4, =CPU_2_MBUSL_DDR_CLK_1x4
	cmp    r5, #CPU_2_DDR_CLK_1x4
	beq    setConfigReg

	/* Else */
	ldr    r4, =0

setConfigReg:
	/* Read CPU Config register */
	MV_REG_READ_ASM (r7, r5, CPU_CONFIG_REG)
	ldr    r5, =~(CCR_CPU_2_MBUSL_TICK_DRV_MASK | CCR_CPU_2_MBUSL_TICK_SMPL_MASK)
	and    r7, r7, r5       /* Clear register fields */
	orr    r7, r7, r4       /* Set the values according to the findings */
	MV_REG_WRITE_ASM (r7, r5, CPU_CONFIG_REG)
#endif

done:
	mov     PC, r11         /* r11 is saved link register */