omap2+: Add support for hwmod specific muxing of devices

This allows adding hwmod specific pads dynamically during the
platform device init.

Note that we don't currently have the hwmod specific signals
listed in the hwmod data, but struct omap_hwmod_mux_info will
make that possible if necessary.

Signed-off-by: Tony Lindgren <tony@atomide.com>

2 files changed, 105 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/mux.c b/arch/arm/mach-omap2/mux.c
index 0fa3d74125bc..27eb51a224cb 100644
--- a/arch/arm/mach-omap2/mux.c
+++ b/arch/arm/mach-omap2/mux.c
@@ -35,6 +35,8 @@
 
 #include <asm/system.h>
 
+#include <plat/omap_hwmod.h>
+
 #include "control.h"
 #include "mux.h"
 
@@ -252,6 +254,69 @@ int __init omap_mux_init_signal(const char *muxname, int val)
 	return 0;
 }
 
+struct omap_hwmod_mux_info * __init
+omap_hwmod_mux_init(struct omap_device_pad *bpads, int nr_pads)
+{
+	struct omap_hwmod_mux_info *hmux;
+	int i;
+
+	if (!bpads || nr_pads < 1)
+		return NULL;
+
+	hmux = kzalloc(sizeof(struct omap_hwmod_mux_info), GFP_KERNEL);
+	if (!hmux)
+		goto err1;
+
+	hmux->nr_pads = nr_pads;
+
+	hmux->pads = kzalloc(sizeof(struct omap_device_pad) *
+				nr_pads, GFP_KERNEL);
+	if (!hmux->pads)
+		goto err2;
+
+	for (i = 0; i < hmux->nr_pads; i++) {
+		struct omap_mux_partition *partition;
+		struct omap_device_pad *bpad = &bpads[i], *pad = &hmux->pads[i];
+		struct omap_mux *mux;
+		int mux_mode;
+
+		mux_mode = omap_mux_get_by_name(bpad->name, &partition, &mux);
+		if (mux_mode < 0)
+			goto err3;
+		if (!pad->partition)
+			pad->partition = partition;
+		if (!pad->mux)
+			pad->mux = mux;
+
+		pad->name = kzalloc(strlen(bpad->name) + 1, GFP_KERNEL);
+		if (!pad->name) {
+			int j;
+
+			for (j = i - 1; j >= 0; j--)
+				kfree(hmux->pads[j].name);
+			goto err3;
+		}
+		strcpy(pad->name, bpad->name);
+
+		pad->flags = bpad->flags;
+		pad->enable = bpad->enable;
+		pad->idle = bpad->idle;
+		pad->off = bpad->off;
+		pr_debug("%s: Initialized %s\n", __func__, pad->name);
+	}
+
+	return hmux;
+
+err3:
+	kfree(hmux->pads);
+err2:
+	kfree(hmux);
+err1:
+	pr_err("%s: Could not allocate device mux entry\n", __func__);
+
+	return NULL;
+}
+
 #ifdef CONFIG_DEBUG_FS
 
 #define OMAP_MUX_MAX_NR_FLAGS	10
diff --git a/arch/arm/mach-omap2/mux.h b/arch/arm/mach-omap2/mux.h
index f5f7f4938057..9c48b9d3ec29 100644
--- a/arch/arm/mach-omap2/mux.h
+++ b/arch/arm/mach-omap2/mux.h
@@ -145,6 +145,32 @@ struct omap_board_mux {
 	u16	value;
 };
 
+#define OMAP_DEVICE_PAD_ENABLED		BIT(7)	/* Not needed for board-*.c */
+#define OMAP_DEVICE_PAD_REMUX		BIT(1)	/* Dynamically remux a pad,
+						   needs enable, idle and off
+						   values */
+#define OMAP_DEVICE_PAD_WAKEUP		BIT(0)	/* Pad is wake-up capable */
+
+/**
+ * struct omap_device_pad - device specific pad configuration
+ * @name:		signal name
+ * @flags:		pad specific runtime flags
+ * @enable:		runtime value for a pad
+ * @idle:		idle value for a pad
+ * @off:		off value for a pad, defaults to safe mode
+ * @partition:		mux partition
+ * @mux:		mux register
+ */
+struct omap_device_pad {
+	char				*name;
+	u8				flags;
+	u16				enable;
+	u16				idle;
+	u16				off;
+	struct omap_mux_partition	*partition;
+	struct omap_mux			*mux;
+};
+
 #if defined(CONFIG_OMAP_MUX)
 
 /**
@@ -161,6 +187,14 @@ int omap_mux_init_gpio(int gpio, int val);
  */
 int omap_mux_init_signal(const char *muxname, int val);
 
+/**
+ * omap_hwmod_mux_init - initialize hwmod specific mux data
+ * @bpads:		Board specific device signal names
+ * @nr_pads:		Number of signal names for the device
+ */
+extern struct omap_hwmod_mux_info *
+omap_hwmod_mux_init(struct omap_device_pad *bpads, int nr_pads);
+
 #else
 
 static inline int omap_mux_init_gpio(int gpio, int val)
@@ -172,6 +206,12 @@ static inline int omap_mux_init_signal(char *muxname, int val)
 	return 0;
 }
 
+static inline struct omap_hwmod_mux_info *
+omap_hwmod_mux_init(struct omap_device_pad *bpads, int nr_pads)
+{
+	return NULL;
+}
+
 static struct omap_board_mux *board_mux __initdata __maybe_unused;
 
 #endif