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[ARM] pxa: allow dynamic enable/disable of GPIO wakeup for pxa{25x,27x}

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Changes include:

1. rename MFP_LPM_WAKEUP_ENABLE into MFP_LPM_CAN_WAKEUP to indicate
   the board capability of this pin to wakeup the system

2. add gpio_set_wake() and keypad_set_wake() to allow dynamically
   enable/disable wakeup from GPIOs and keypad GPIO

   * these functions are currently kept in mfp-pxa2xx.c due to their
     dependency to the MFP configuration

3. pxa2xx_mfp_config() only gives early warning if MFP_LPM_CAN_WAKEUP
   is set on incorrect pins

So that the GPIO's wakeup capability is now decided by the following:

   a) processor's capability: (only those GPIOs which have dedicated
      bits within PWER/PRER/PFER can wakeup the system), this is
      initialized by pxa{25x,27x}_init_mfp()

   b) board design decides:
      - whether the pin is designed to wakeup the system (some of
        the GPIOs are configured as other functions, which is not
        intended to be a wakeup source), by OR'ing the pin config
        with MFP_LPM_CAN_WAKEUP

      - which edge the pin is designed to wakeup the system, this
        may depends on external peripherals/connections, which is
        totally board specific; this is indicated by MFP_LPM_EDGE_*

   c) the corresponding device's (most likely the gpio_keys.c) wakeup
      attribute:

Signed-off-by: eric miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
eric miao
2008-04-19 11:29:05 +01:00
committed by Russell King
parent 9b02b2df00
commit c0a596d6a1
5 changed files with 90 additions and 67 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/asm-arm/arch-pxa/mfp-pxa27x.h
+1
View File
@@ -428,4 +428,5 @@
#define GPIO112_nMSINS MFP_CFG_IN(GPIO112, AF2)
#define GPIO32_MSSCLK MFP_CFG_OUT(GPIO32, AF1, DRIVE_LOW)
extern int keypad_set_wake(unsigned int on);
#endif /* __ASM_ARCH_MFP_PXA27X_H */
include/asm-arm/arch-pxa/mfp-pxa2xx.h
+6 -5
View File
@@ -24,13 +24,13 @@
#define MFP_DIR_MASK (0x1 << 23)
#define MFP_DIR(x) (((x) >> 23) & 0x1)
#define MFP_LPM_WAKEUP_ENABLE (0x1 << 24)
#define WAKEUP_ON_EDGE_RISE (MFP_LPM_WAKEUP_ENABLE | MFP_LPM_EDGE_RISE)
#define WAKEUP_ON_EDGE_FALL (MFP_LPM_WAKEUP_ENABLE | MFP_LPM_EDGE_FALL)
#define WAKEUP_ON_EDGE_BOTH (MFP_LPM_WAKEUP_ENABLE | MFP_LPM_EDGE_BOTH)
#define MFP_LPM_CAN_WAKEUP (0x1 << 24)
#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_WAKEUP_ENABLE)
#define WAKEUP_ON_LEVEL_HIGH (MFP_LPM_CAN_WAKEUP)
#define MFP_CFG_IN(pin, af) \
((MFP_CFG_DEFAULT & ~(MFP_AF_MASK | MFP_DIR_MASK)) |\
@@ -128,4 +128,5 @@
#define GPIO84_GPIO MFP_CFG_IN(GPIO84, AF0)
extern void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num);
extern int gpio_set_wake(unsigned int gpio, unsigned int on);
#endif /* __ASM_ARCH_MFP_PXA2XX_H */