OMAP: mux: Add support for control module split in several partitions

Starting on OMAP4, the pin mux configuration is located in two
different partitions of the control module (CODE_PAD and WKUP_PAD).
The first one is inside the core power domain whereas the second
one is inside the wakeup.
- Add the capability to add any number of partition during board init
time depending of Soc partitioning.
- Add some init flags as well in order to avoid explicit Soc version
check inside the mux core code.
- Add a comment with mux0 mode on top of omap_mux/board/<partition>
if the current mux mode is not the default one.

Thanks to Tony Lindgren <tony@atomide.com> for the following improvements:
- Add omap_mux_get for getting the partition data so platform level
device code can use it.
- Fix the rx51 board code to use the new API.
- Do not store the partition for each mux entry. Look up the partition
for debugfs instead.

Thanks to Dan Murphy <dmurphy@ti.com> for testing on OMAP4 and reporting
a couple of bugs.
Thanks to Anand Gadiyar <gadiyar@ti.com> for testing on OMAP3 zoom and
bug report.

Signed-off-by: Benoit Cousson <b-cousson@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Tested-by: Murphy Dan <dmurphy@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Anand Gadiyar <gadiyar@ti.com>

1 files changed, 58 insertions, 12 deletions

diff --git a/arch/arm/mach-omap2/mux.h b/arch/arm/mach-omap2/mux.h
index 350c04f27383..86549bedd526 100644
--- a/arch/arm/mach-omap2/mux.h
+++ b/arch/arm/mach-omap2/mux.h
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) 2009 Nokia
- * Copyright (C) 2009 Texas Instruments
+ * Copyright (C) 2009-2010 Texas Instruments
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -56,7 +56,7 @@
 
 #define OMAP_MODE_GPIO(x)       (((x) & OMAP_MUX_MODE7) == OMAP_MUX_MODE4)
 
-/* Flags for omap_mux_init */
+/* Flags for omapX_mux_init */
 #define OMAP_PACKAGE_MASK               0xffff
 #define OMAP_PACKAGE_CBP                6               /* 515-pin 0.40 0.50 */
 #define OMAP_PACKAGE_CUS                5               /* 423-pin 0.65 */
@@ -66,14 +66,47 @@
 #define OMAP_PACKAGE_ZAF                1               /* 2420 447-pin SIP */
 
 
-#define OMAP_MUX_NR_MODES       8                       /* Available modes */
-#define OMAP_MUX_NR_SIDES       2                       /* Bottom & top */
+#define OMAP_MUX_NR_MODES               8               /* Available modes */
+#define OMAP_MUX_NR_SIDES               2               /* Bottom & top */
+
+/*
+ * omap_mux_init flags definition:
+ *
+ * OMAP_MUX_REG_8BIT: Ensure that access to padconf is done in 8 bits.
+ * The default value is 16 bits.
+ * OMAP_MUX_GPIO_IN_MODE3: The GPIO is selected in mode3.
+ * The default is mode4.
+ */
+#define OMAP_MUX_REG_8BIT               (1 << 0)
+#define OMAP_MUX_GPIO_IN_MODE3          (1 << 1)
+
+/**
+ * struct mux_partition - contain partition related information
+ * @name: name of the current partition
+ * @flags: flags specific to this partition
+ * @phys: physical address
+ * @size: partition size
+ * @base: virtual address after ioremap
+ * @muxmodes: list of nodes that belong to a partition
+ * @node: list node for the partitions linked list
+ */
+struct omap_mux_partition {
+        const char              *name;
+        u32                     flags;
+        u32                     phys;
+        u32                     size;
+        void __iomem            *base;
+        struct list_head        muxmodes;
+        struct list_head        node;
+};
 
 /**
  * struct omap_mux - data for omap mux register offset and it's value
  * @reg_offset: mux register offset from the mux base
  * @gpio:       GPIO number
  * @muxnames:   available signal modes for a ball
+ * @balls:      available balls on the package
+ * @partition:  mux partition
  */
 struct omap_mux {
         u16     reg_offset;
@@ -151,28 +184,39 @@ u16 omap_mux_get_gpio(int gpio);
 void omap_mux_set_gpio(u16 val, int gpio);
 
 /**
+ * omap_mux_get() - get a mux partition by name
+ * @name:               Name of the mux partition
+ *
+ */
+struct omap_mux_partition *omap_mux_get(const char *name);
+
+/**
  * omap_mux_read() - read mux register
+ * @partition:          Mux partition
  * @mux_offset:         Offset of the mux register
  *
  */
-u16 omap_mux_read(u16 mux_offset);
+u16 omap_mux_read(struct omap_mux_partition *p, u16 mux_offset);
 
 /**
  * omap_mux_write() - write mux register
+ * @partition:          Mux partition
  * @val:                New mux register value
  * @mux_offset:         Offset of the mux register
  *
  * This should be only needed for dynamic remuxing of non-gpio signals.
  */
-void omap_mux_write(u16 val, u16 mux_offset);
+void omap_mux_write(struct omap_mux_partition *p, u16 val, u16 mux_offset);
 
 /**
  * omap_mux_write_array() - write an array of mux registers
+ * @partition:          Mux partition
  * @board_mux:          Array of mux registers terminated by MAP_MUX_TERMINATOR
  *
  * This should be only needed for dynamic remuxing of non-gpio signals.
  */
-void omap_mux_write_array(struct omap_board_mux *board_mux);
+void omap_mux_write_array(struct omap_mux_partition *p,
+                          struct omap_board_mux *board_mux);
 
 /**
  * omap2420_mux_init() - initialize mux system with board specific set
@@ -198,8 +242,10 @@ int omap3_mux_init(struct omap_board_mux *board_mux, int flags);
 /**
  * omap_mux_init - private mux init function, do not call
  */
-int omap_mux_init(u32 mux_pbase, u32 mux_size,
-                                struct omap_mux *superset,
-                                struct omap_mux *package_subset,
-                                struct omap_board_mux *board_mux,
-                                struct omap_ball *package_balls);
+int omap_mux_init(const char *name, u32 flags,
+                  u32 mux_pbase, u32 mux_size,
+                  struct omap_mux *superset,
+                  struct omap_mux *package_subset,
+                  struct omap_board_mux *board_mux,
+                  struct omap_ball *package_balls);
+