int PSCModuleControl (unsigned int baseAdd, unsigned int moduleId,
unsigned int powerDomain, unsigned int flags)
{
volatile unsigned int timeout = 0xFFFFFF;
int retVal = 0;
unsigned int status = 0;
HWREG(baseAdd + PSC_MDCTL(moduleId)) = (flags & PSC_MDCTL_NEXT);
if (powerDomain == 0)
{
HWREG(baseAdd + PSC_PTCMD) = PSC_PTCMD_GO0;
}
else
{
HWREG(baseAdd + PSC_PTCMD) = PSC_PTCMD_GO1;
}
if (powerDomain == 0)
{
do {
status = HWREG(baseAdd + PSC_PTSTAT) & PSC_PTSTAT_GOSTAT0;
} while (status && timeout--);
}
else
{
do {
status = HWREG(baseAdd + PSC_PTSTAT) & PSC_PTSTAT_GOSTAT1;
} while (status && timeout--);
}
if (timeout != 0)
{
timeout = 0xFFFFFF;
status = flags & PSC_MDCTL_NEXT;
do {
timeout--;
} while(timeout &&
(HWREG(baseAdd + PSC_MDSTAT(moduleId)) & PSC_MDSTAT_STATE) != status);
}
if (timeout == 0)
{
retVal = -1;
}
return retVal;
}
int PSCModuleControl(unsigned int baseAdd, unsigned int moduleId,
unsigned int powerDomain, unsigned int flags)
{
/*
PSC???
managing transitions of system power on/off,
clock on/off, resets (device level and module level).
primarily to provide granular power control
for on chip modules (peripherals and CPU).
*/
/*
baseAdd 0x01E27000
-> PSC1 BYTE ADDRESS(0x01E2 7000)
-> REVID(Peripheral Revision and Class Information Register)
moduleId 3
powerDomain 0
flags 0x00000003u
*/
volatile unsigned int timeout = 0xFFFFFF;
int retVal = 0;
unsigned int status = 0;
HWREG(baseAdd + PSC_MDCTL(moduleId)) = (flags & PSC_MDCTL_NEXT);
/*
#define HWREG(x) (*((volatile unsigned int *)(x)))
baseAdd = 0x01E27000
PSC_MDCTL(moduleId)
#define PSC_MDCTL(n) (0xA00 + (n * 4))
moduleId = 3 -> 0xA0C
baseAdd + PSC_MDCTL(moduleId) -> 0x01E2 7A0C
-> 0x01E2 7A0C -> MDCTL3 -> Module 3 Control Register
(flags & PSC_MDCTL_NEXT)
flags = 0x00000003u, PSC_MDCTL_NEXT = 0x0000 001Fu -> & -> 0x3
MDCTL3 = 0x3
-> PSC1 Module Control 3 Register -> Enable state
-> GPIO( alwaysON(PD0) )
*/
if (powerDomain == 0) //powerDomain = 0
{
/*
POWER DOMAIN???
• ON: power to the domain is on
• OFF: power to the domain is off
the Always ON domain (or PD0 power domain)
Additionally, for both PSC0 and PSC1, the PD1 power domains,
the internal/pseudo power domain can either be in the ON state or OFF state.
*/
HWREG(baseAdd + PSC_PTCMD) = PSC_PTCMD_GO0;
/*
baseAdd = 0x01E27000
PSC_PTCMD = 0x120
+ -> 0x1E27120 -> HWREG(0x1E27120)
-> *((volatile unsigned int *)(0x1E27120))
-> PTCMD(Power Domain Transition Command Register)
#define PSC_PTCMD_GO0 (0x00000001u)
PTCMD = 0x0000 0001u
-> Always ON (PD0) power domain GO transition command.
*/
}
else //powerDomain != 0
{
HWREG(baseAdd + PSC_PTCMD) = PSC_PTCMD_GO1;
/*
#define PSC_PTCMD_GO1 (0x00000002u)
PTCMD = 0x00000002u
-> RAM/Pseudo (PD1) power domain GO transition command.
*/
}
if (powerDomain == 0) //powerDomain = 0
{
do {
status = HWREG(baseAdd + PSC_PTSTAT) & PSC_PTSTAT_GOSTAT0;
/*
baseAdd = 0x01E27000
PSC_PTSTAT = 0x128
[+] -> 0x1E2 7128
HWREG(0x1E2 7128)
-> PTSTAT(Power Domain Transition Status Register)
PSC_PTSTAT_GOSTAT0 = 0x0000 0001u
& -> only GOSTAT[0] is 1
-> Always ON (PD0) power domain transition status.
-> status
*/
} while (status && timeout--);
/*
status && timeout(= 0xFFFFFF)
*/
}
else //powerDomain != 0
{
do {
status = HWREG(baseAdd + PSC_PTSTAT) & PSC_PTSTAT_GOSTAT1;
/*
HWREG(baseAdd + PSC_PTSTAT) -> PTSTAT
#define PSC_PTSTAT_GOSTAT1 (0x00000002u)
& -> only GOSTAT[1] is 1
-> RAM/Pseudo (PD1) power domain transition status.
-> status
*/
} while (status && timeout--);
/*
status && timeout(= 0xFFFFFF)
*/
}
if(timeout != 0)
{
timeout = 0xFFFFFF;
status = flags & PSC_MDCTL_NEXT;
/*
flags = 0x0000 0003u
PSC_MDCTL_NEXT = 0x0000 001Fu
& -> 0x0000 0003u -> status
*/
do {
timeout--;
//timeout = 0xFFFFFE
} while(timeout &&
(HWREG(baseAdd + PSC_MDSTAT(moduleId)) & PSC_MDSTAT_STATE) != status);
/*
timeout = 0xFFFFFE
baseAdd = 0x01E27000
#define PSC_MDSTAT(n) (0x800 + (n * 4))
moduleId = 3 -> PSC_MDSTAT(moduleId) -> 0x80C
HWREG(baseAdd + PSC_MDSTAT(moduleId) ->
HWREG( 0x01E2 780C ) -> MDSTAT3(Module 3 Status Register)
PSC_MDSTAT_STATE = 0x0000 0003Fu
while( timeout && ( MDSTAT3 & PSC_MDSTAT_STATE ) != status )
*/
}
if (timeout == 0)//if fail, return -1
{
retVal = -1;
}
return retVal;
}
