From: Dan Carpenter <dan.carpenter@oracle.com>
To: benh@kernel.crashing.org
Cc: linuxppc-dev@lists.ozlabs.org
Subject: re: [POWERPC] 4xx: EP405 boards support for arch/powerpc
Date: Mon, 20 Oct 2014 12:06:27 +0300 [thread overview]
Message-ID: <20141020090627.GA24768@mwanda> (raw)
Hello Benjamin Herrenschmidt,
The patch 619740384ceb: "[POWERPC] 4xx: EP405 boards support for
arch/powerpc" from Dec 21, 2007, leads to the following static
checker warning:
arch/powerpc/boot/4xx.c:567 ibm405gp_fixup_clocks()
warn: shifting and masking to zero
arch/powerpc/boot/4xx.c
562 fbdv = (pllmr & 0x1e000000) >> 25;
563 if (fbdv == 0)
564 fbdv = 16;
565 cbdv = ((pllmr & 0x00060000) >> 17) + 1; /* CPU:PLB */
566 opdv = ((pllmr & 0x00018000) >> 15) + 1; /* PLB:OPB */
567 ppdv = ((pllmr & 0x00001800) >> 13) + 1; /* PLB:PCI */
^^^^^^^^^^^^^^^^^^^^^^^^^
This mask and shift means that ppdv is always 1.
568 epdv = ((pllmr & 0x00001800) >> 11) + 2; /* PLB:EBC */
569 udiv = ((cpc0_cr0 & 0x3e) >> 1) + 1;
570
571 /* check for 405GPr */
572 if ((mfpvr() & 0xfffffff0) == (0x50910951 & 0xfffffff0)) {
573 fwdvb = 8 - (pllmr & 0x00000007);
574 if (!(psr & 0x00001000)) /* PCI async mode enable == 0 */
575 if (psr & 0x00000020) /* New mode enable */
576 m = fwdvb * 2 * ppdv;
577 else
578 m = fwdvb * cbdv * ppdv;
regards,
dan carpenter
next reply other threads:[~2014-10-20 9:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-20 9:06 Dan Carpenter [this message]
2014-10-20 10:52 ` [POWERPC] 4xx: EP405 boards support for arch/powerpc Benjamin Herrenschmidt
2014-10-20 19:02 ` Wolfgang Denk
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