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>

arch/arm/mach-omap2/board-rx51-peripherals.c

@@ -293,6 +293,8 @@ static struct omap_board_mux rx51_mmc2_off_mux[] = {
 	{ .reg_offset = OMAP_MUX_TERMINATOR },
 };
 
+static struct omap_mux_partition *partition;
+
 /*
  * Current flows to eMMC when eMMC is off and the data lines are pulled up,
  * so pull them down. N.B. we pull 8 lines because we are using 8 lines.
@@ -300,9 +302,9 @@ static struct omap_board_mux rx51_mmc2_off_mux[] = {
 static void rx51_mmc2_remux(struct device *dev, int slot, int power_on)
 {
 	if (power_on)
-		omap_mux_write_array(rx51_mmc2_on_mux);
+		omap_mux_write_array(partition, rx51_mmc2_on_mux);
 	else
-		omap_mux_write_array(rx51_mmc2_off_mux);
+		omap_mux_write_array(partition, rx51_mmc2_off_mux);
 }
 
 static struct omap2_hsmmc_info mmc[] __initdata = {
@@ -922,7 +924,11 @@ void __init rx51_peripherals_init(void)
 	rx51_init_wl1251();
 	spi_register_board_info(rx51_peripherals_spi_board_info,
 				ARRAY_SIZE(rx51_peripherals_spi_board_info));
+
+	partition = omap_mux_get("core");
+	if (partition)
 		omap2_hsmmc_init(mmc);
+
 	platform_device_register(&rx51_charger_device);
 }
 

arch/arm/mach-omap2/mux.h

 /*
  * 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 */
@@ -69,11 +69,44 @@
 #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;
@@ -150,29 +183,40 @@ 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,
+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);
+

arch/arm/mach-omap2/mux2420.c

@@ -681,7 +681,8 @@ int __init omap2420_mux_init(struct omap_board_mux *board_subset, int flags)
 		pr_warning("mux: No ball data available for omap2420 package\n");
 	}
 
-	return omap_mux_init(OMAP2420_CONTROL_PADCONF_MUX_PBASE,
+	return omap_mux_init("core", OMAP_MUX_REG_8BIT | OMAP_MUX_GPIO_IN_MODE3,
+			     OMAP2420_CONTROL_PADCONF_MUX_PBASE,
 			     OMAP2420_CONTROL_PADCONF_MUX_SIZE,
 			     omap2420_muxmodes, NULL, board_subset,
 			     package_balls);

arch/arm/mach-omap2/mux2430.c

@@ -784,7 +784,8 @@ int __init omap2430_mux_init(struct omap_board_mux *board_subset, int flags)
 		pr_warning("mux: No ball data available for omap2420 package\n");
 	}
 
-	return omap_mux_init(OMAP2430_CONTROL_PADCONF_MUX_PBASE,
+	return omap_mux_init("core", OMAP_MUX_REG_8BIT | OMAP_MUX_GPIO_IN_MODE3,
+			     OMAP2430_CONTROL_PADCONF_MUX_PBASE,
 			     OMAP2430_CONTROL_PADCONF_MUX_SIZE,
 			     omap2430_muxmodes, NULL, board_subset,
 			     package_balls);

arch/arm/mach-omap2/mux34xx.c

@@ -2053,7 +2053,8 @@ int __init omap3_mux_init(struct omap_board_mux *board_subset, int flags)
 		return -EINVAL;
 	}
 
-	return omap_mux_init(OMAP3_CONTROL_PADCONF_MUX_PBASE,
+	return omap_mux_init("core", 0,
+			     OMAP3_CONTROL_PADCONF_MUX_PBASE,
 			     OMAP3_CONTROL_PADCONF_MUX_SIZE,
 			     omap3_muxmodes, package_subset, board_subset,
 			     package_balls);