arch/arm/mach-omap2/clkt2xxx_dpllcore.c

File Facts

System

Linux kernel

Corpus path

arch/arm/mach-omap2/clkt2xxx_dpllcore.c

Extension

.c

Size

5208 bytes

Lines

195

Domain

Architecture Layer

Bucket

arch/arm

Inferred role

Architecture Layer: implementation source

Status

source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/kernel.h
• linux/errno.h
• linux/clk.h
• linux/clk/ti.h
• linux/io.h
• clock.h
• clock2xxx.h
• opp2xxx.h
• cm2xxx.h
• cm-regbits-24xx.h
• sdrc.h
• sram.h

Detected Declarations

• function omap2xxx_clk_get_core_rate
• function omap2_dpllcore_round_rate
• function omap2_dpllcore_recalc
• function omap2_reprogram_dpllcore
• function clk_get

Annotated Snippet

if (rate > low) {
			tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL_X2;
			mult = ((rate / 2) / 1000000);
			done_rate = CORE_CLK_SRC_DPLL_X2;
		} else {
			tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL;
			mult = (rate / 1000000);
			done_rate = CORE_CLK_SRC_DPLL;
		}
		tmpset.cm_clksel1_pll |= (div << __ffs(dd->mult_mask));
		tmpset.cm_clksel1_pll |= (mult << __ffs(dd->div1_mask));

		/* Worst case */
		tmpset.base_sdrc_rfr = SDRC_RFR_CTRL_BYPASS;

		if (rate == curr_prcm_set->xtal_speed)	/* If asking for 1-1 */
			bypass = 1;

		/* For omap2xxx_sdrc_init_params() */
		omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1);

		/* Force dll lock mode */
		omap2_set_prcm(tmpset.cm_clksel1_pll, tmpset.base_sdrc_rfr,
			       bypass);

		/* Errata: ret dll entry state */
		omap2xxx_sdrc_init_params(omap2xxx_sdrc_dll_is_unlocked());
		omap2xxx_sdrc_reprogram(done_rate, 0);
	}

	return 0;
}

/**
 * omap2xxx_clkt_dpllcore_init - clk init function for dpll_ck
 * @clk: struct clk *dpll_ck
 *
 * Store a local copy of @clk in dpll_core_ck so other code can query
 * the core rate without having to clk_get(), which can sleep.  Must
 * only be called once.  No return value.  XXX If the clock
 * registration process is ever changed such that dpll_ck is no longer
 * statically defined, this code may need to change to increment some
 * kind of use count on dpll_ck.
 */
void omap2xxx_clkt_dpllcore_init(struct clk_hw *hw)
{
	WARN(dpll_core_ck, "dpll_core_ck already set - should never happen");
	dpll_core_ck = to_clk_hw_omap(hw);
}

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/errno.h`, `linux/clk.h`, `linux/clk/ti.h`, `linux/io.h`, `clock.h`, `clock2xxx.h`, `opp2xxx.h`.
• Detected declarations: `function omap2xxx_clk_get_core_rate`, `function omap2_dpllcore_round_rate`, `function omap2_dpllcore_recalc`, `function omap2_reprogram_dpllcore`, `function clk_get`.
• Atlas domain: Architecture Layer / arch/arm.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.