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#include <u.h>
#include <libc.h>
#include <fcall.h>
#include <thread.h>
#include <9p.h>
enum
{
Mhz = 1000*1000,
Pwmsrcclk = 25*Mhz,
Ctl = 1,
Temp,
PWMSAR = 0x0c/4,
PWMPR = 0x10/4,
TMUTMR = 0x00/4,
TMR_ME = 1<<31,
TMR_ALPF_SHIFT = 26,
TMR_MSITE_SHIFT = 13,
TMUTSR = 0x04/4,
TSR_MIE = 1<<30,
TSR_ORL = 1<<29,
TSR_ORH = 1<<28,
TMUTMTMIR = 0x08/4,
TMUTIER = 0x20/4,
TMUTIDR = 0x24/4,
TIDR_MASK = 0xe0000000,
TMUTISCR = 0x28/4,
TMUTICSCR = 0x2c/4,
TMUTTCFGR = 0x80/4,
TMUTSCFGR = 0x84/4,
TMUTRITSR0 = 0x100/4,
TMUTRITSR1 = 0x110/4,
TMUTRITSR2 = 0x120/4,
TMUTTR0CR = 0xf10/4,
TMUTTR1CR = 0xf14/4,
TMUTTR2CR = 0xf18/4,
TMUTTR3CR = 0xf1c/4,
CR_CAL_PTR_SHIFT = 16,
};
static u32int *pwm2, *tmu;
static char *uid = "mntpm";
static void
wr(u32int *base, int reg, u32int v)
{
//fprint(2, "[0%x] ← 0x%ux\n", reg*4, v);
if(base != nil)
base[reg] = v;
}
static u32int
rd(u32int *base, int reg)
{
return base != nil ? base[reg] : -1;
}
static void
setbrightness(int p)
{
u32int v;
if(p < 0)
p = 0;
if(p > 100)
p = 100;
v = Pwmsrcclk / rd(pwm2, PWMSAR);
wr(pwm2, PWMPR, (Pwmsrcclk/(v*p/100))-2);
}
static int
getbrightness(void)
{
u32int m, v;
m = Pwmsrcclk / rd(pwm2, PWMSAR);
v = Pwmsrcclk / (rd(pwm2, PWMPR)+2);
return v*100/m;
}
static int
getcputemp(int c[3])
{
int i, r[] = {TMUTRITSR0, TMUTRITSR1, TMUTRITSR2};
u32int s;
s = rd(tmu, TMUTSR);
if(s & TSR_MIE){
werrstr("monitoring interval exceeded");
return -1;
}
if(s & (TSR_ORL|TSR_ORH)){
werrstr("out of range");
return -1;
}
c[0] = c[1] = c[2] = 0;
for(;;){
for(i = 0; i < 3; i++)
if(c[i] >= 0)
c[i] = rd(tmu, r[i]);
if(c[0] < 0 && c[1] < 0 && c[2] < 0)
break;
sleep(10);
}
c[0] &= 0xff;
c[1] &= 0xff;
c[2] &= 0xff;
return 0;
}
static void
tmuinit(void)
{
/* without proper calibration data sensing is useless */
static u8int cfg[4][12] = {
{0x23, 0x29, 0x2f, 0x35, 0x3d, 0x43, 0x4b, 0x51, 0x57, 0x5f, 0x67, 0x6f},
{0x1b, 0x23, 0x2b, 0x33, 0x3b, 0x43, 0x4b, 0x55, 0x5d, 0x67, 0x70, 0},
{0x17, 0x23, 0x2d, 0x37, 0x41, 0x4b, 0x57, 0x63, 0x6f, 0},
{0x15, 0x21, 0x2d, 0x39, 0x45, 0x53, 0x5f, 0x71, 0},
};
int i, j;
wr(tmu, TMUTMR, 0); /* disable */
wr(tmu, TMUTIER, 0); /* disable all interrupts */
wr(tmu, TMUTMTMIR, 0xf); /* no monitoring interval */
/* configure default ranges */
wr(tmu, TMUTTR0CR, 11<<CR_CAL_PTR_SHIFT | 0);
wr(tmu, TMUTTR1CR, 10<<CR_CAL_PTR_SHIFT | 38);
wr(tmu, TMUTTR2CR, 8<<CR_CAL_PTR_SHIFT | 72);
wr(tmu, TMUTTR3CR, 7<<CR_CAL_PTR_SHIFT | 97);
/* calibration data */
for(i = 0; i < 4; i++){
for(j = 0; j < 12 && cfg[i][j] != 0; j++){
wr(tmu, TMUTTCFGR, i<<16|j);
wr(tmu, TMUTSCFGR, cfg[i][j]);
}
}
/* enable: all sites, ALPF 11=0.125 */
wr(tmu, TMUTMR, TMR_ME | 3<<TMR_ALPF_SHIFT | 7<<TMR_MSITE_SHIFT);
}
static void
fsread(Req *r)
{
char msg[256];
int c[3];
msg[0] = 0;
if(r->ifcall.offset == 0){
if(r->fid->file->aux == (void*)Ctl)
snprint(msg, sizeof(msg), "brightness %d\n", getbrightness());
else if(r->fid->file->aux == (void*)Temp){
if(getcputemp(c) == 0)
snprint(msg, sizeof(msg), "%d.0\n%d.0\n%d.0\n", c[0], c[1], c[2]);
else
snprint(msg, sizeof(msg), "%r\n");
}
}
readstr(r, msg);
respond(r, nil);
}
static void
fswrite(Req *r)
{
char msg[256], *f[4];
int nf;
if(r->fid->file->aux == (void*)Ctl){
snprint(msg, sizeof(msg), "%.*s",
utfnlen((char*)r->ifcall.data, r->ifcall.count), (char*)r->ifcall.data);
nf = tokenize(msg, f, nelem(f));
if(nf < 2){
respond(r, "invalid ctl message");
return;
}
if(strcmp(f[0], "brightness") == 0)
setbrightness(atoi(f[1]));
}
r->ofcall.count = r->ifcall.count;
respond(r, nil);
}
static Srv fs = {
.read = fsread,
.write = fswrite,
};
static void
usage(void)
{
fprint(2, "usage: aux/imx8pm [-D] [-m /mnt/pm] [-s service]\n");
exits("usage");
}
void
main(int argc, char **argv)
{
char *mtpt, *srv;
mtpt = "/mnt/pm";
srv = nil;
ARGBEGIN{
case 'D':
chatty9p = 1;
break;
case 'm':
mtpt = EARGF(usage());
break;
case 's':
srv = EARGF(usage());
break;
default:
usage();
}ARGEND
fs.tree = alloctree(uid, uid, DMDIR|0555, nil);
createfile(fs.tree->root, "ctl", uid, 0666, (void*)Ctl);
if((tmu = segattach(0, "tmu", 0, 0xf20)) == (void*)-1)
tmu = nil;
else{
createfile(fs.tree->root, "cputemp", uid, 0444, (void*)Temp);
tmuinit();
}
if((pwm2 = segattach(0, "pwm2", 0, 0x18)) == (void*)-1)
pwm2 = nil;
postmountsrv(&fs, srv, mtpt, MREPL);
exits(nil);
}
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