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>

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 082495b..bfa276a 100644 (file)
--- 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 d3e55a0..815d98b 100644 (file)
--- 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.
  */

diff --git a/include/linux/cs5535.h b/include/linux/cs5535.h
index d5a1d48..213cc50 100644 (file)
--- 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 */