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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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26dd3e4ff9
Historically a lot of these existed because we did not have a distinction between what was modular code and what was providing support to modules via EXPORT_SYMBOL and friends. That changed when we forked out support for the latter into the export.h file. This means we should be able to reduce the usage of module.h in code that is obj-y Makefile or bool Kconfig. In the case of some code where it is modular, we can extend that to also include files that are building basic support functionality but not related to loading or registering the final module; such files also have no need whatsoever for module.h The advantage in removing such instances is that module.h itself sources about 15 other headers; adding significantly to what we feed cpp, and it can obscure what headers we are effectively using. Since module.h might have been the implicit source for init.h (for __init) and for export.h (for EXPORT_SYMBOL) we consider each instance for the presence of either and replace/add as needed. Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code. Build coverage of all the mips defconfigs revealed the module.h header was masking a couple of implicit include instances, so we add the appropriate headers there. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: David Daney <david.daney@cavium.com> Cc: John Crispin <john@phrozen.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: "Steven J. Hill" <steven.hill@cavium.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/15131/ [james.hogan@imgtec.com: Preserve sort order where it already exists] Signed-off-by: James Hogan <james.hogan@imgtec.com>
85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/*
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* Au1300 media block power gating (VSS)
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*
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* This is a stop-gap solution until I have the clock framework integration
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* ready. This stuff here really must be handled transparently when clocks
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* for various media blocks are enabled/disabled.
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*/
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#include <linux/export.h>
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#include <linux/spinlock.h>
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#include <asm/mach-au1x00/au1000.h>
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#define VSS_GATE 0x00 /* gate wait timers */
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#define VSS_CLKRST 0x04 /* clock/block control */
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#define VSS_FTR 0x08 /* footers */
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#define VSS_ADDR(blk) (KSEG1ADDR(AU1300_VSS_PHYS_ADDR) + (blk * 0x0c))
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static DEFINE_SPINLOCK(au1300_vss_lock);
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/* enable a block as outlined in the databook */
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static inline void __enable_block(int block)
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{
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void __iomem *base = (void __iomem *)VSS_ADDR(block);
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__raw_writel(3, base + VSS_CLKRST); /* enable clock, assert reset */
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wmb();
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__raw_writel(0x01fffffe, base + VSS_GATE); /* maximum setup time */
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wmb();
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/* enable footers in sequence */
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__raw_writel(0x01, base + VSS_FTR);
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wmb();
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__raw_writel(0x03, base + VSS_FTR);
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wmb();
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__raw_writel(0x07, base + VSS_FTR);
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wmb();
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__raw_writel(0x0f, base + VSS_FTR);
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wmb();
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__raw_writel(0x01ffffff, base + VSS_GATE); /* start FSM too */
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wmb();
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__raw_writel(2, base + VSS_CLKRST); /* deassert reset */
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wmb();
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__raw_writel(0x1f, base + VSS_FTR); /* enable isolation cells */
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wmb();
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}
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/* disable a block as outlined in the databook */
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static inline void __disable_block(int block)
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{
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void __iomem *base = (void __iomem *)VSS_ADDR(block);
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__raw_writel(0x0f, base + VSS_FTR); /* disable isolation cells */
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wmb();
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__raw_writel(0, base + VSS_GATE); /* disable FSM */
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wmb();
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__raw_writel(3, base + VSS_CLKRST); /* assert reset */
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wmb();
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__raw_writel(1, base + VSS_CLKRST); /* disable clock */
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wmb();
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__raw_writel(0, base + VSS_FTR); /* disable all footers */
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wmb();
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}
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void au1300_vss_block_control(int block, int enable)
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{
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unsigned long flags;
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if (alchemy_get_cputype() != ALCHEMY_CPU_AU1300)
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return;
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/* only one block at a time */
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spin_lock_irqsave(&au1300_vss_lock, flags);
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if (enable)
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__enable_block(block);
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else
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__disable_block(block);
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spin_unlock_irqrestore(&au1300_vss_lock, flags);
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}
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EXPORT_SYMBOL_GPL(au1300_vss_block_control);
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