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imx8/usdhc: implement highspeed mode (50Mhz)

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cinap_lenrek 2022-06-18 13:19:55 +00:00
parent 524f8c2d53
commit e760ded494
1 changed files with 11 additions and 0 deletions
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11
sys/src/9/imx8/usdhc.c
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@ -10,6 +10,7 @@
enum {
Initfreq = 400000, /* initialisation frequency for MMC */
SDfreq = 25*Mhz, /* standard SD frequency */
SDfreqhs = 50*Mhz, /* highspeed frequency */
DTO = 14, /* data timeout exponent (guesswork) */
GoIdle = 0, /* mmc/sdio go idle state */
@ -446,6 +447,15 @@ usdhccmd(u32int cmd, u32int arg, u32int *resp)
WR(Control0, (RR(Control0) & ~DwidthMask) | Dwidth4);
break;
}
} else {
/*
* If card switched into high speed mode, increase clock speed
*/
if((arg&0x8000000F) == 0x80000001){
delay(1);
usdhcclk(SDfreqhs);
delay(1);
}
}
}else if(cmd == IORWdirect && (arg & ~0xFF) == (1<<31|0<<28|7<<9)){
switch(arg & 0x3){
@ -518,4 +528,5 @@ SDio sdio = {
usdhccmd,
usdhciosetup,
usdhcio,
.highspeed = 1,
};