diff options
| author | Andres Salomon <dilinger@queued.net> | 2011-01-12 17:00:10 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-13 08:03:13 -0800 |
| commit | 1b912c1bca5c162e611384fe7d39c916e081701a (patch) | |
| tree | ae3a1c48954cec0a7f9d0b16207e9bfe6c4d22e6 /drivers/gpio | |
| parent | 5f003feba2a8761d2ee7b367df5a0fe6b729dc8f (diff) | |
drivers/gpio/cs5535-gpio.c: add some additional cs5535-specific GPIO functionality
This adds (well, re-adds actually) handling for events/IRQs through cs5535
GPIOs. In the wild and wooly world of CS5535, setup_event() is for
assigning an IRQ to a GPIO filter/event pair, and set_irq() sets up the
pair to trigger IRQs.
These should really only be used in highly platform-specific drivers (such
as OLPC's DCON driver). Sadly, because set_irq() uses MSRs, this causes
the driver to become X86-specific.
Signed-off-by: Andres Salomon <dilinger@queued.net>
Signed-off-by: Daniel Drake <dsd@laptop.org>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/gpio/cs5535-gpio.c | 52 |
2 files changed, 53 insertions, 1 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 082495bb08a..bfa276a9541 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -295,7 +295,7 @@ comment "PCI GPIO expanders:" config GPIO_CS5535 tristate "AMD CS5535/CS5536 GPIO support" - depends on PCI && !CS5535_GPIO + depends on PCI && X86 && !CS5535_GPIO help The AMD CS5535 and CS5536 southbridges support 28 GPIO pins that can be used for quite a number of things. The CS5535/6 is found on diff --git a/drivers/gpio/cs5535-gpio.c b/drivers/gpio/cs5535-gpio.c index d3e55a0ae92..815d98b2c1b 100644 --- a/drivers/gpio/cs5535-gpio.c +++ b/drivers/gpio/cs5535-gpio.c @@ -15,6 +15,7 @@ #include <linux/gpio.h> #include <linux/io.h> #include <linux/cs5535.h> +#include <asm/msr.h> #define DRV_NAME "cs5535-gpio" #define GPIO_BAR 1 @@ -144,6 +145,57 @@ int cs5535_gpio_isset(unsigned offset, unsigned int reg) } EXPORT_SYMBOL_GPL(cs5535_gpio_isset); +int cs5535_gpio_set_irq(unsigned group, unsigned irq) +{ + uint32_t lo, hi; + + if (group > 7 || irq > 15) + return -EINVAL; + + rdmsr(MSR_PIC_ZSEL_HIGH, lo, hi); + + lo &= ~(0xF << (group * 4)); + lo |= (irq & 0xF) << (group * 4); + + wrmsr(MSR_PIC_ZSEL_HIGH, lo, hi); + return 0; +} +EXPORT_SYMBOL_GPL(cs5535_gpio_set_irq); + +void cs5535_gpio_setup_event(unsigned offset, int pair, int pme) +{ + struct cs5535_gpio_chip *chip = &cs5535_gpio_chip; + uint32_t shift = (offset % 8) * 4; + unsigned long flags; + uint32_t val; + + if (offset >= 24) + offset = GPIO_MAP_W; + else if (offset >= 16) + offset = GPIO_MAP_Z; + else if (offset >= 8) + offset = GPIO_MAP_Y; + else + offset = GPIO_MAP_X; + + spin_lock_irqsave(&chip->lock, flags); + val = inl(chip->base + offset); + + /* Clear whatever was there before */ + val &= ~(0xF << shift); + + /* Set the new value */ + val |= ((pair & 7) << shift); + + /* Set the PME bit if this is a PME event */ + if (pme) + val |= (1 << (shift + 3)); + + outl(val, chip->base + offset); + spin_unlock_irqrestore(&chip->lock, flags); +} +EXPORT_SYMBOL_GPL(cs5535_gpio_setup_event); + /* * Generic gpio_chip API support. */ |