drivers/staging/sm750fb/ddk750_power.c

Source file repositories/reference/linux-study-clean/drivers/staging/sm750fb/ddk750_power.c

File Facts

System
Linux kernel
Corpus path
drivers/staging/sm750fb/ddk750_power.c
Extension
.c
Size
2858 bytes
Lines
146
Domain
Driver Families
Bucket
drivers/staging
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
#include "ddk750_chip.h"
#include "ddk750_reg.h"
#include "ddk750_power.h"

void ddk750_set_dpms(enum dpms state)
{
	unsigned int value;

	if (sm750_get_chip_type() == SM750LE) {
		value = peek32(CRT_DISPLAY_CTRL) & ~CRT_DISPLAY_CTRL_DPMS_MASK;
		value |= (state << CRT_DISPLAY_CTRL_DPMS_SHIFT);
		poke32(CRT_DISPLAY_CTRL, value);
	} else {
		value = peek32(SYSTEM_CTRL);
		value = (value & ~SYSTEM_CTRL_DPMS_MASK) | state;
		poke32(SYSTEM_CTRL, value);
	}
}

static unsigned int get_power_mode(void)
{
	if (sm750_get_chip_type() == SM750LE)
		return 0;
	return peek32(POWER_MODE_CTRL) & POWER_MODE_CTRL_MODE_MASK;
}

/*
 * SM50x can operate in one of three modes: 0, 1 or Sleep.
 * On hardware reset, power mode 0 is default.
 */
void sm750_set_power_mode(unsigned int mode)
{
	unsigned int ctrl = 0;

	ctrl = peek32(POWER_MODE_CTRL) & ~POWER_MODE_CTRL_MODE_MASK;

	if (sm750_get_chip_type() == SM750LE)
		return;

	switch (mode) {
	case POWER_MODE_CTRL_MODE_MODE0:
		ctrl |= POWER_MODE_CTRL_MODE_MODE0;
		break;

	case POWER_MODE_CTRL_MODE_MODE1:
		ctrl |= POWER_MODE_CTRL_MODE_MODE1;
		break;

	case POWER_MODE_CTRL_MODE_SLEEP:
		ctrl |= POWER_MODE_CTRL_MODE_SLEEP;
		break;

	default:
		break;
	}

	/* Set up other fields in Power Control Register */
	if (mode == POWER_MODE_CTRL_MODE_SLEEP) {
		ctrl &= ~POWER_MODE_CTRL_OSC_INPUT;
#ifdef VALIDATION_CHIP
		ctrl &= ~POWER_MODE_CTRL_336CLK;
#endif
	} else {
		ctrl |= POWER_MODE_CTRL_OSC_INPUT;
#ifdef VALIDATION_CHIP
		ctrl |= POWER_MODE_CTRL_336CLK;
#endif
	}

	/* Program new power mode. */
	poke32(POWER_MODE_CTRL, ctrl);
}

void sm750_set_current_gate(unsigned int gate)
{
	if (get_power_mode() == POWER_MODE_CTRL_MODE_MODE1)
		poke32(MODE1_GATE, gate);
	else
		poke32(MODE0_GATE, gate);
}

/*
 * This function enable/disable the 2D engine.
 */
void sm750_enable_2d_engine(unsigned int enable)
{
	u32 gate;

	gate = peek32(CURRENT_GATE);

Annotation

Implementation Notes