arch/arm/mach-pxa/mfp-pxa2xx.h

Source file repositories/reference/linux-study-clean/arch/arm/mach-pxa/mfp-pxa2xx.h

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-pxa/mfp-pxa2xx.h
Extension
.h
Size
5546 bytes
Lines
144
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.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef __ASM_ARCH_MFP_PXA2XX_H
#define __ASM_ARCH_MFP_PXA2XX_H

#include <linux/soc/pxa/mfp.h>

/*
 * the following MFP_xxx bit definitions in mfp.h are re-used for pxa2xx:
 *
 *  MFP_PIN(x)
 *  MFP_AFx
 *  MFP_LPM_DRIVE_{LOW, HIGH}
 *  MFP_LPM_EDGE_x
 *
 * other MFP_x bit definitions will be ignored
 *
 * and adds the below two bits specifically for pxa2xx:
 *
 * bit     23 - Input/Output (PXA2xx specific)
 * bit     24 - Wakeup Enable(PXA2xx specific)
 * bit     25 - Keep Output  (PXA2xx specific)
 */

#define MFP_DIR_IN		(0x0 << 23)
#define MFP_DIR_OUT		(0x1 << 23)
#define MFP_DIR_MASK		(0x1 << 23)
#define MFP_DIR(x)		(((x) >> 23) & 0x1)

#define MFP_LPM_CAN_WAKEUP	(0x1 << 24)

/*
 * MFP_LPM_KEEP_OUTPUT must be specified for pins that need to
 * retain their last output level (low or high).
 * Note: MFP_LPM_KEEP_OUTPUT has no effect on pins configured for input.
 */
#define MFP_LPM_KEEP_OUTPUT	(0x1 << 25)

#define WAKEUP_ON_EDGE_RISE	(MFP_LPM_CAN_WAKEUP | MFP_LPM_EDGE_RISE)
#define WAKEUP_ON_EDGE_FALL	(MFP_LPM_CAN_WAKEUP | MFP_LPM_EDGE_FALL)
#define WAKEUP_ON_EDGE_BOTH	(MFP_LPM_CAN_WAKEUP | MFP_LPM_EDGE_BOTH)

/* specifically for enabling wakeup on keypad GPIOs */
#define WAKEUP_ON_LEVEL_HIGH	(MFP_LPM_CAN_WAKEUP)

#define MFP_CFG_IN(pin, af)		\
	((MFP_CFG_DEFAULT & ~(MFP_AF_MASK | MFP_DIR_MASK)) |\
	 (MFP_PIN(MFP_PIN_##pin) | MFP_##af | MFP_DIR_IN))

/* NOTE:  pins configured as output _must_ provide a low power state,
 * and this state should help to minimize the power dissipation.
 */
#define MFP_CFG_OUT(pin, af, state)	\
	((MFP_CFG_DEFAULT & ~(MFP_AF_MASK | MFP_DIR_MASK | MFP_LPM_STATE_MASK)) |\
	 (MFP_PIN(MFP_PIN_##pin) | MFP_##af | MFP_DIR_OUT | MFP_LPM_##state))

/* Common configurations for pxa25x and pxa27x
 *
 * Note: pins configured as GPIO are always initialized to input
 * so not to cause any side effect
 */
#define GPIO0_GPIO	MFP_CFG_IN(GPIO0, AF0)
#define GPIO1_GPIO	MFP_CFG_IN(GPIO1, AF0)
#define GPIO9_GPIO	MFP_CFG_IN(GPIO9, AF0)
#define GPIO10_GPIO	MFP_CFG_IN(GPIO10, AF0)
#define GPIO11_GPIO	MFP_CFG_IN(GPIO11, AF0)
#define GPIO12_GPIO	MFP_CFG_IN(GPIO12, AF0)
#define GPIO13_GPIO	MFP_CFG_IN(GPIO13, AF0)
#define GPIO14_GPIO	MFP_CFG_IN(GPIO14, AF0)
#define GPIO15_GPIO	MFP_CFG_IN(GPIO15, AF0)
#define GPIO16_GPIO	MFP_CFG_IN(GPIO16, AF0)
#define GPIO17_GPIO	MFP_CFG_IN(GPIO17, AF0)
#define GPIO18_GPIO	MFP_CFG_IN(GPIO18, AF0)
#define GPIO19_GPIO	MFP_CFG_IN(GPIO19, AF0)
#define GPIO20_GPIO	MFP_CFG_IN(GPIO20, AF0)
#define GPIO21_GPIO	MFP_CFG_IN(GPIO21, AF0)
#define GPIO22_GPIO	MFP_CFG_IN(GPIO22, AF0)
#define GPIO23_GPIO	MFP_CFG_IN(GPIO23, AF0)
#define GPIO24_GPIO	MFP_CFG_IN(GPIO24, AF0)
#define GPIO25_GPIO	MFP_CFG_IN(GPIO25, AF0)
#define GPIO26_GPIO	MFP_CFG_IN(GPIO26, AF0)
#define GPIO27_GPIO	MFP_CFG_IN(GPIO27, AF0)
#define GPIO28_GPIO	MFP_CFG_IN(GPIO28, AF0)
#define GPIO29_GPIO	MFP_CFG_IN(GPIO29, AF0)
#define GPIO30_GPIO	MFP_CFG_IN(GPIO30, AF0)
#define GPIO31_GPIO	MFP_CFG_IN(GPIO31, AF0)
#define GPIO32_GPIO	MFP_CFG_IN(GPIO32, AF0)
#define GPIO33_GPIO	MFP_CFG_IN(GPIO33, AF0)
#define GPIO34_GPIO	MFP_CFG_IN(GPIO34, AF0)
#define GPIO35_GPIO	MFP_CFG_IN(GPIO35, AF0)
#define GPIO36_GPIO	MFP_CFG_IN(GPIO36, AF0)
#define GPIO37_GPIO	MFP_CFG_IN(GPIO37, AF0)

Annotation

Implementation Notes