coreboot.git - my copy of coreboot

Age	Commit message (Collapse)	Author
2019-09-24	device/mmio.h: Add bit field helpers	Hung-Te Lin
	When accessing register with multiple bit fields, the common approach is to use clrsetbits_le32, for example: clrsetbits(&reg, (1 << 0) \| (0x3 << 1) \| (0x7 << 10), (1 << 0) \| (0x1 << 1) \| (0x5 << 10)); This hard to maintain because we have to calculate the mask values manually, make sure the duplicated shift (offset) was set correctly. And it may be even worse if the value to set will be based on some runtime values (that many developers will do a if-block with two very similar argument list), and leaving lots of magic numbers. We want to encourage developers always giving field names, and have a better way of setting fields. The proposed utility macros are: DEFINE_BITFIELD(name, high_bit, low_bit) EXTRACT_BITFIELD(value, name) WRITE32_BITFIELDS(addr, name, value, [name2, value2, ...]) READ32_BITFIELD(addr, name) Where a developer can easily convert from data sheet like BITS NAME 26:24 SEC_VIO Into a declaration DEFINE_BITFIELD(SEC_VIO, 26, 24) Then, a simple call can set the field as: WRITE32_BITFIELDS(&reg, SEC_VIO, 2); That is much easier to understand than clrsetbits_le32(&reg, 0x7 << 24, 0x2 << 24); And to extract the value: READ32_BITFIELD(&reg, SEC_VIO) That is equivalent to: (read32(&reg) & 0x3) >> 24 Change-Id: I8a1b17142f7a7dc6c441b0b1ee67d60d73ec8cc8 Signed-off-by: Hung-Te Lin <hungte@chromium.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/35463 Reviewed-by: Julius Werner <jwerner@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
2019-08-22	Add buffer_to/from_fifo32(_prefix) helpers	Julius Werner
	Many peripheral drivers across different SoCs regularly face the same task of piping a transfer buffer into (or reading it out of) a 32-bit FIFO register. Sometimes it's just one register, sometimes a whole array of registers. Sometimes you actually transfer 4 bytes per register read/write, sometimes only 2 (or even 1). Sometimes writes need to be prefixed with one or two command bytes which makes the actual payload buffer "misaligned" in relation to the FIFO and requires a bunch of tricky bit packing logic to get right. Most of the times transfer lengths are not guaranteed to be divisible by 4, which also requires a bunch of logic to treat the potential unaligned end of the transfer correctly. We have a dozen different implementations of this same pattern across coreboot. This patch introduces a new family of helper functions that aims to solve all these use cases once and for all (fingers crossed). Change-Id: Ia71f66c1cee530afa4c77c46a838b4de646ffcfb Signed-off-by: Julius Werner <jwerner@chromium.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/34850 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Patrick Georgi <pgeorgi@google.com>
2019-03-04	arch/io.h: Separate MMIO and PNP ops	Kyösti Mälkki
	Change-Id: Ie32f1d43168c277be46cdbd7fbfa2445d9899689 Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-on: https://review.coreboot.org/c/31699 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
2019-03-04	device/mmio.h: Add include file for MMIO ops	Kyösti Mälkki
	MMIO operations are arch-agnostic so the include path should not be arch/. Change-Id: I0fd70f5aeca02e98e96b980c3aca0819f5c44b98 Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-on: https://review.coreboot.org/c/31691 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>