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Redo the workaround for at91rm9200 erratum #26 in a way that doesn't

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cause a lockup on some rm92 hardware.
This commit is contained in:
Ian Lepore 2013-03-29 18:17:51 +00:00
parent c29eb73802
commit 5c4938ee48
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=248904
1 changed files with 9 additions and 15 deletions
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24
sys/arm/at91/at91_pmc.c
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@ -227,23 +227,18 @@ at91_pmc_set_pllb_mode(struct at91_pmc_clock *clk, int on)
struct at91_pmc_softc *sc = pmc_softc;
uint32_t value;
if (on) {
on = PMC_IER_LOCKB;
value = pllb_init;
} else
value = 0;
value = on ? pllb_init : 0;
/* Workaround RM9200 Errata #26 */
if (at91_is_rm92() &&
((value ^ RD4(sc, CKGR_PLLBR)) & 0x03f0ff) != 0) {
WR4(sc, CKGR_PLLBR, value ^ 1);
while ((RD4(sc, PMC_SR) & PMC_IER_LOCKB) != on)
/*
* Only write to the register if the value is changing. Besides being
* good common sense, this works around RM9200 Errata #26 (CKGR_PLL[AB]R
* must not be written with the same value currently in the register).
*/
if (RD4(sc, CKGR_PLLBR) != value) {
WR4(sc, CKGR_PLLBR, value);
while (on && (RD4(sc, PMC_SR) & PMC_IER_LOCKB) != PMC_IER_LOCKB)
continue;
}
WR4(sc, CKGR_PLLBR, value);
while ((RD4(sc, PMC_SR) & PMC_IER_LOCKB) != on)
continue;
}
static void
@ -577,7 +572,6 @@ at91_pmc_init_clock(void)
WR4(sc, PMC_SCER, PMC_SCER_MCKUDP);
} else
WR4(sc, PMC_SCDR, PMC_SCER_UHP_SAM9 | PMC_SCER_UDP_SAM9);
WR4(sc, CKGR_PLLBR, 0);
/*
* MCK and PCU derive from one of the primary clocks. Initialize