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| H A D | io.h | 5481559069fd1c671e041a96d35e63f134ea3d60 Mon Dec 17 20:01:51 UTC 2018 Etienne Carriere <etienne.carriere@linaro.org> core: io_{set|clr|clrset}bits32() helpers
Introduce new iomem util functions to set, clear or set and clear
bit masks in peripheral interfaces.
io_setbits32(addr, mask) sets the bits enabled in mask at address.
io_clrbits32(addr, mask) clears the bits enabled in mask.
io_clrsetbits32(addr, clear_mask, set_mask) clears the bits enabled in
clear_mask and sets the bits enabled in set_mask.
These functions are more friendly in instruction blocks to sets and
clears bitmasks in peripheral registers. They provide a more readable
implementation than playing with io_mask32() for the equivalent
sequence, for example, extracted from a DDR controller driver:
(...)
/* IOs powering down (PUBL registers) */
io_setbits32(ddrphy_base + DDRPHYC_ACIOCR, DDRPHYC_ACIOCR_ACPDD);
io_setbits_32(ddrphy_base + DDRPHYC_ACIOCR, DDRPHYC_ACIOCR_ACPDR);
io_clrsetbits32(ddrphy_base + DDRPHYC_ACIOCR,
DDRPHYC_ACIOCR_CKPDD_MASK, DDRPHYC_ACIOCR_CKPDD_0);
io_clrsetbits32(ddrphy_base + DDRPHYC_ACIOCR,
DDRPHYC_ACIOCR_CKPDR_MASK, DDRPHYC_ACIOCR_CKPDR_0);
io_clrsetbits32(ddrphy_base + DDRPHYC_ACIOCR,
DDRPHYC_ACIOCR_CSPDD_MASK, DDRPHYC_ACIOCR_CSPDD_0);
(...)
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
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