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 <[email protected]> --- drivers/gpio/Kconfig | 2 +- drivers/gpio/cs5535-gpio.c | 52 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/cs5535.h | 2 + 3 files changed, 55 insertions(+), 1 deletions(-) diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 510aa20..80f6702 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -271,7 +271,7 @@ 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 e23c068..7e5ab74 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 @@ -121,6 +122,57 @@ 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. */ diff --git a/include/linux/cs5535.h b/include/linux/cs5535.h index d5a1d48..213cc50 100644 --- a/include/linux/cs5535.h +++ b/include/linux/cs5535.h @@ -111,6 +111,8 @@ static inline int cs5535_has_vsa2(void) void cs5535_gpio_set(unsigned offset, unsigned int reg); void cs5535_gpio_clear(unsigned offset, unsigned int reg); int cs5535_gpio_isset(unsigned offset, unsigned int reg); +int cs5535_gpio_set_irq(unsigned group, unsigned irq); +void cs5535_gpio_setup_event(unsigned offset, int pair, int pme); /* MFGPTs */ -- 1.5.6.5 _______________________________________________ devel mailing list [email protected] http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
