davinci: gpio bugfixes

Update the DaVinci GPIO code to work better on non-dm6446 parts,
notably the dm355:

 - Only handle the number of GPIOs the chip actually has.  So
   for example on dm6467, GPIO-42 is the last GPIO, and trying
   to use GPIO-43 now fails cleanly; or GPIO-72 on dm6446.

 - Enable GPIO interrupts on each 16-bit GPIO-irq bank ...
   previously, only the first five were enabled, so GPIO-80
   and above (on dm355) wouldn't trigger IRQs.

 - Use the right IRQ for each GPIO bank.  The wrong values were
   used for dm355 chips, so GPIO IRQs got routed incorrectly.

 - Handle up to four pairs of 16-bit GPIO banks ... previously
   only three were handled, so accessing GPIO-96 and up (e.g. on
   dm355) would oops.

 - Update several comments that were dm6446-specific.

Verified by receiving GPIO-1 (dm9000) and GPIO-5 (msp430) IRQs
on the DM355 EVM.

One thing this doesn't do is handle the way some of the GPIO
numbers on dm6467 are reserved but aren't valid as GPIOs.  Some
bitmap logic could fix that if needed.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 10 insertions, 13 deletions

diff --git a/arch/arm/mach-davinci/include/mach/gpio.h b/arch/arm/mach-davinci/include/mach/gpio.h
index 5e7c36b202f1..efe3281364e6 100644
--- a/arch/arm/mach-davinci/include/mach/gpio.h
+++ b/arch/arm/mach-davinci/include/mach/gpio.h
@@ -28,23 +28,18 @@
  * go through boot loaders.
  *
  * the gpio clock will be turned on when gpios are used, and you may also
- * need to pay attention to PINMUX0 and PINMUX1 to be sure those pins are
+ * need to pay attention to PINMUX registers to be sure those pins are
  * used as gpios, not with other peripherals.
  *
  * On-chip GPIOs are numbered 0..(DAVINCI_N_GPIO-1).  For documentation,
- * and maybe for later updates, code should write GPIO(N) or:
- *  - GPIOV18(N) for 1.8V pins, N in 0..53; same as GPIO(0)..GPIO(53)
- *  - GPIOV33(N) for 3.3V pins, N in 0..17; same as GPIO(54)..GPIO(70)
- *
- * For GPIO IRQs use gpio_to_irq(GPIO(N)) or gpio_to_irq(GPIOV33(N)) etc
- * for now, that's != GPIO(N)
+ * and maybe for later updates, code may write GPIO(N).  These may be
+ * all 1.8V signals, all 3.3V ones, or a mix of the two.  A given chip
+ * may not support all the GPIOs in that range.
  *
  * GPIOs can also be on external chips, numbered after the ones built-in
  * to the DaVinci chip.  For now, they won't be usable as IRQ sources.
  */
-#define GPIO(X)         (X)             /* 0 <= X <= 70 */
-#define GPIOV18(X)      (X)             /* 1.8V i/o; 0 <= X <= 53 */
-#define GPIOV33(X)      ((X)+54)        /* 3.3V i/o; 0 <= X <= 17 */
+#define GPIO(X)         (X)             /* 0 <= X <= (DAVINCI_N_GPIO - 1) */
 
 struct gpio_controller {
         u32     dir;
@@ -73,12 +68,14 @@ __gpio_to_controller(unsigned gpio)
 {
         void *__iomem ptr;
 
-        if (gpio < 32)
+        if (gpio < 32 * 1)
                 ptr = IO_ADDRESS(DAVINCI_GPIO_BASE + 0x10);
-        else if (gpio < 64)
+        else if (gpio < 32 * 2)
                 ptr = IO_ADDRESS(DAVINCI_GPIO_BASE + 0x38);
-        else if (gpio < DAVINCI_N_GPIO)
+        else if (gpio < 32 * 3)
                 ptr = IO_ADDRESS(DAVINCI_GPIO_BASE + 0x60);
+        else if (gpio < 32 * 4)
+                ptr = IO_ADDRESS(DAVINCI_GPIO_BASE + 0x88);
         else
                 ptr = NULL;
         return ptr;