mailbox/omap: move the OMAP mailbox framework to drivers

The mailbox hardware (in OMAP) uses a queued mailbox interrupt
mechanism that provides a communication channel between processors
through a set of registers and their associated interrupt signals
by sending and receiving messages.

The OMAP mailbox framework/driver code is moved to be under
drivers/mailbox, in preparation for adapting to a common mailbox
driver framework. This allows the build for OMAP mailbox to be
enabled (it was disabled during the multi-platform support).

As part of the migration from plat and mach code:
- Kconfig symbols have been renamed to build OMAP1 or OMAP2+ drivers.
- mailbox.h under plat-omap/plat/include has been split into a public
  and private header files. The public header has only the API related
  functions and types.
- The module name mailbox.ko from plat-omap is changed to
  omap-mailbox.ko
- The module name mailbox_mach.ko from mach-omapX is changed as
    mailbox_omap1.ko for OMAP1
    mailbox_omap2.ko for OMAP2+

Cc: Tony Lindgren <tony@atomide.com>
[gregkh@linuxfoundation.org: ack for staging part]
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Omar Ramirez Luna <omar.ramirez@copitl.com>
Signed-off-by: Suman Anna <s-anna@ti.com>

arch/arm/configs/omap1_defconfig

@@ -26,7 +26,8 @@ CONFIG_ARCH_OMAP=y
 CONFIG_ARCH_OMAP1=y
 CONFIG_OMAP_RESET_CLOCKS=y
 # CONFIG_OMAP_MUX is not set
-CONFIG_OMAP_MBOX_FWK=y
+CONFIG_MAILBOX=y
+CONFIG_OMAP1_MBOX=y
 CONFIG_OMAP_32K_TIMER=y
 CONFIG_OMAP_DM_TIMER=y
 CONFIG_ARCH_OMAP730=y

arch/arm/mach-omap1/Makefile

@@ -19,10 +19,6 @@ obj-$(CONFIG_ARCH_OMAP16XX) += ocpi.o
 # Power Management
 obj-$(CONFIG_PM) += pm.o sleep.o
 
-# DSP
-obj-$(CONFIG_OMAP_MBOX_FWK)	+= mailbox_mach.o
-mailbox_mach-objs		:= mailbox.o
-
 i2c-omap-$(CONFIG_I2C_OMAP)		:= i2c.o
 obj-y					+= $(i2c-omap-m) $(i2c-omap-y)
 

arch/arm/mach-omap2/Makefile

@@ -203,9 +203,6 @@ obj-$(CONFIG_ARCH_OMAP4)		+= omap_hwmod_44xx_data.o
 obj-$(CONFIG_OMAP3_EMU)			+= emu.o
 obj-$(CONFIG_HW_PERF_EVENTS)		+= pmu.o
 
-obj-$(CONFIG_OMAP_MBOX_FWK)		+= mailbox_mach.o
-mailbox_mach-objs			:= mailbox.o
-
 iommu-$(CONFIG_OMAP_IOMMU)		:= omap-iommu.o
 obj-y					+= $(iommu-m) $(iommu-y)
 

arch/arm/mach-omap2/devices.c

@@ -328,7 +328,7 @@ int __init omap4_keyboard_init(struct omap4_keypad_platform_data
 	return 0;
 }
 
-#if defined(CONFIG_OMAP_MBOX_FWK) || defined(CONFIG_OMAP_MBOX_FWK_MODULE)
+#if defined(CONFIG_OMAP2PLUS_MBOX) || defined(CONFIG_OMAP2PLUS_MBOX_MODULE)
 static inline void __init omap_init_mbox(void)
 {
 	struct omap_hwmod *oh;
@@ -352,7 +352,7 @@ static inline void __init omap_init_mbox(void)
 }
 #else
 static inline void omap_init_mbox(void) { }
-#endif /* CONFIG_OMAP_MBOX_FWK */
+#endif /* CONFIG_OMAP2PLUS_MBOX */
 
 static inline void omap_init_sti(void) {}
 

arch/arm/plat-omap/Kconfig

@@ -86,22 +86,6 @@ config OMAP_MUX_WARNINGS
 	  to change the pin multiplexing setup.	 When there are no warnings
 	  printed, it's safe to deselect OMAP_MUX for your product.
 
-config OMAP_MBOX_FWK
-	tristate "Mailbox framework support"
-	depends on ARCH_OMAP && !ARCH_MULTIPLATFORM
-	help
-	  Say Y here if you want to use OMAP Mailbox framework support for
-	  DSP, IVA1.0 and IVA2 in OMAP1/2/3.
-
-config OMAP_MBOX_KFIFO_SIZE
-	int "Mailbox kfifo default buffer size (bytes)"
-	depends on OMAP_MBOX_FWK
-	default 256
-	help
-	  Specify the default size of mailbox's kfifo buffers (bytes).
-	  This can also be changed at runtime (via the mbox_kfifo_size
-	  module parameter).
-
 config OMAP_IOMMU_IVA2
 	bool
 

arch/arm/plat-omap/Makefile

@@ -17,6 +17,3 @@ obj-$(CONFIG_OMAP_DEBUG_LEDS) += debug-leds.o
 i2c-omap-$(CONFIG_I2C_OMAP) := i2c.o
 obj-y += $(i2c-omap-m) $(i2c-omap-y)
 
-# OMAP mailbox framework
-obj-$(CONFIG_OMAP_MBOX_FWK) += mailbox.o
-

drivers/mailbox/Kconfig

@@ -16,4 +16,38 @@ config PL320_MBOX
 	  Management Engine, primarily for cpufreq. Say Y here if you want
 	  to use the PL320 IPCM support.
 
+config OMAP_MBOX
+	tristate
+	help
+	  This option is selected by any OMAP architecture specific mailbox
+	  driver such as CONFIG_OMAP1_MBOX or CONFIG_OMAP2PLUS_MBOX. This
+	  enables the common OMAP mailbox framework code.
+
+config OMAP1_MBOX
+	tristate "OMAP1 Mailbox framework support"
+	depends on ARCH_OMAP1
+	select OMAP_MBOX
+	help
+	  Mailbox implementation for OMAP chips with hardware for
+	  interprocessor communication involving DSP in OMAP1. Say Y here
+	  if you want to use OMAP1 Mailbox framework support.
+
+config OMAP2PLUS_MBOX
+	tristate "OMAP2+ Mailbox framework support"
+	depends on ARCH_OMAP2PLUS
+	select OMAP_MBOX
+	help
+	  Mailbox implementation for OMAP family chips with hardware for
+	  interprocessor communication involving DSP, IVA1.0 and IVA2 in
+	  OMAP2/3; or IPU, IVA HD and DSP in OMAP4/5. Say Y here if you
+	  want to use OMAP2+ Mailbox framework support.
+
+config OMAP_MBOX_KFIFO_SIZE
+	int "Mailbox kfifo default buffer size (bytes)"
+	depends on OMAP2PLUS_MBOX || OMAP1_MBOX
+	default 256
+	help
+	  Specify the default size of mailbox's kfifo buffers (bytes).
+	  This can also be changed at runtime (via the mbox_kfifo_size
+	  module parameter).
 endif

drivers/mailbox/Makefile

@@ -1 +1,7 @@
 obj-$(CONFIG_PL320_MBOX)	+= pl320-ipc.o
+
+obj-$(CONFIG_OMAP_MBOX)		+= omap-mailbox.o
+obj-$(CONFIG_OMAP1_MBOX)	+= mailbox_omap1.o
+mailbox_omap1-objs		:= mailbox-omap1.o
+obj-$(CONFIG_OMAP2PLUS_MBOX)	+= mailbox_omap2.o
+mailbox_omap2-objs		:= mailbox-omap2.o

arch/arm/mach-omap1/mailbox.c → drivers/mailbox/mailbox-omap1.c

@@ -13,7 +13,8 @@
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
-#include <plat/mailbox.h>
+
+#include "omap-mbox.h"
 
 #define MAILBOX_ARM2DSP1		0x00
 #define MAILBOX_ARM2DSP1b		0x04

arch/arm/mach-omap2/mailbox.c → drivers/mailbox/mailbox-omap2.c

@@ -19,7 +19,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/platform_data/mailbox-omap.h>
 
-#include <plat/mailbox.h>
+#include "omap-mbox.h"
 
 #define MAILBOX_REVISION		0x000
 #define MAILBOX_MESSAGE(m)		(0x040 + 4 * (m))
@@ -331,9 +331,9 @@ static int omap2_mbox_remove(struct platform_device *pdev)
 }
 
 static struct platform_driver omap2_mbox_driver = {
-	.probe = omap2_mbox_probe,
-	.remove = omap2_mbox_remove,
-	.driver = {
+	.probe	= omap2_mbox_probe,
+	.remove	= omap2_mbox_remove,
+	.driver	= {
 		.name = "omap-mailbox",
 	},
 };

arch/arm/plat-omap/mailbox.c → drivers/mailbox/omap-mailbox.c

@@ -31,7 +31,7 @@
 #include <linux/notifier.h>
 #include <linux/module.h>
 
-#include <plat/mailbox.h>
+#include "omap-mbox.h"
 
 static struct omap_mbox **mboxes;
 
@@ -116,6 +116,40 @@ out:
 }
 EXPORT_SYMBOL(omap_mbox_msg_send);
 
+void omap_mbox_save_ctx(struct omap_mbox *mbox)
+{
+	if (!mbox->ops->save_ctx) {
+		dev_err(mbox->dev, "%s:\tno save\n", __func__);
+		return;
+	}
+
+	mbox->ops->save_ctx(mbox);
+}
+EXPORT_SYMBOL(omap_mbox_save_ctx);
+
+void omap_mbox_restore_ctx(struct omap_mbox *mbox)
+{
+	if (!mbox->ops->restore_ctx) {
+		dev_err(mbox->dev, "%s:\tno restore\n", __func__);
+		return;
+	}
+
+	mbox->ops->restore_ctx(mbox);
+}
+EXPORT_SYMBOL(omap_mbox_restore_ctx);
+
+void omap_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
+{
+	mbox->ops->enable_irq(mbox, irq);
+}
+EXPORT_SYMBOL(omap_mbox_enable_irq);
+
+void omap_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
+{
+	mbox->ops->disable_irq(mbox, irq);
+}
+EXPORT_SYMBOL(omap_mbox_disable_irq);
+
 static void mbox_tx_tasklet(unsigned long tx_data)
 {
 	struct omap_mbox *mbox = (struct omap_mbox *)tx_data;

arch/arm/plat-omap/include/plat/mailbox.h → drivers/mailbox/omap-mbox.h

@@ -1,20 +1,20 @@
-/* mailbox.h */
+/*
+ * omap-mbox.h: OMAP mailbox internal definitions
+ *
+ * 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
+ * published by the Free Software Foundation.
+ */
 
-#ifndef MAILBOX_H
-#define MAILBOX_H
+#ifndef OMAP_MBOX_H
+#define OMAP_MBOX_H
 
-#include <linux/spinlock.h>
-#include <linux/workqueue.h>
-#include <linux/interrupt.h>
 #include <linux/device.h>
+#include <linux/interrupt.h>
 #include <linux/kfifo.h>
-
-typedef u32 mbox_msg_t;
-struct omap_mbox;
-
-typedef int __bitwise omap_mbox_irq_t;
-#define IRQ_TX ((__force omap_mbox_irq_t) 1)
-#define IRQ_RX ((__force omap_mbox_irq_t) 2)
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+#include <linux/omap-mailbox.h>
 
 typedef int __bitwise omap_mbox_type_t;
 #define OMAP_MBOX_TYPE1 ((__force omap_mbox_type_t) 1)
@@ -58,48 +58,10 @@ struct omap_mbox {
 	struct device		*dev;
 	void			*priv;
 	int			use_count;
-	struct blocking_notifier_head   notifier;
+	struct blocking_notifier_head	notifier;
 };
 
-int omap_mbox_msg_send(struct omap_mbox *, mbox_msg_t msg);
-void omap_mbox_init_seq(struct omap_mbox *);
-
-struct omap_mbox *omap_mbox_get(const char *, struct notifier_block *nb);
-void omap_mbox_put(struct omap_mbox *mbox, struct notifier_block *nb);
-
 int omap_mbox_register(struct device *parent, struct omap_mbox **);
 int omap_mbox_unregister(void);
 
-static inline void omap_mbox_save_ctx(struct omap_mbox *mbox)
-{
-	if (!mbox->ops->save_ctx) {
-		dev_err(mbox->dev, "%s:\tno save\n", __func__);
-		return;
-	}
-
-	mbox->ops->save_ctx(mbox);
-}
-
-static inline void omap_mbox_restore_ctx(struct omap_mbox *mbox)
-{
-	if (!mbox->ops->restore_ctx) {
-		dev_err(mbox->dev, "%s:\tno restore\n", __func__);
-		return;
-	}
-
-	mbox->ops->restore_ctx(mbox);
-}
-
-static inline void omap_mbox_enable_irq(struct omap_mbox *mbox,
-					omap_mbox_irq_t irq)
-{
-	mbox->ops->enable_irq(mbox, irq);
-}
-
-static inline void omap_mbox_disable_irq(struct omap_mbox *mbox,
-					 omap_mbox_irq_t irq)
-{
-	mbox->ops->disable_irq(mbox, irq);
-}
-
-#endif /* MAILBOX_H */
+#endif /* OMAP_MBOX_H */

drivers/remoteproc/Kconfig

@@ -14,8 +14,9 @@ config OMAP_REMOTEPROC
 	depends on HAS_DMA
 	depends on ARCH_OMAP4 || SOC_OMAP5
 	depends on OMAP_IOMMU
-	depends on OMAP_MBOX_FWK
 	select REMOTEPROC
+	select MAILBOX
+	select OMAP2PLUS_MBOX
 	select RPMSG
 	help
 	  Say y here to support OMAP's remote processors (dual M3

drivers/remoteproc/omap_remoteproc.c

@@ -27,8 +27,8 @@
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
 #include <linux/remoteproc.h>
+#include <linux/omap-mailbox.h>
 
-#include <plat/mailbox.h>
 #include <linux/platform_data/remoteproc-omap.h>
 
 #include "omap_remoteproc.h"

drivers/staging/tidspbridge/Kconfig

@@ -5,7 +5,8 @@
 menuconfig TIDSPBRIDGE
 	tristate "DSP Bridge driver"
 	depends on ARCH_OMAP3 && !ARCH_MULTIPLATFORM
-	select OMAP_MBOX_FWK
+	select MAILBOX
+	select OMAP2PLUS_MBOX
 	help
 	  DSP/BIOS Bridge is designed for platforms that contain a GPP and
 	  one or more attached DSPs.  The GPP is considered the master or

drivers/staging/tidspbridge/include/dspbridge/host_os.h

@@ -41,7 +41,7 @@
 #include <linux/ioport.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
-#include <plat/mailbox.h>
+#include <linux/omap-mailbox.h>
 #include <linux/pagemap.h>
 #include <asm/cacheflush.h>
 #include <linux/dma-mapping.h>

include/linux/omap-mailbox.h

@@ -0,0 +1,29 @@
+/*
+ * omap-mailbox: interprocessor communication module for OMAP
+ *
+ * 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
+ * published by the Free Software Foundation.
+ */
+
+#ifndef OMAP_MAILBOX_H
+#define OMAP_MAILBOX_H
+
+typedef u32 mbox_msg_t;
+struct omap_mbox;
+
+typedef int __bitwise omap_mbox_irq_t;
+#define IRQ_TX ((__force omap_mbox_irq_t) 1)
+#define IRQ_RX ((__force omap_mbox_irq_t) 2)
+
+int omap_mbox_msg_send(struct omap_mbox *, mbox_msg_t msg);
+
+struct omap_mbox *omap_mbox_get(const char *, struct notifier_block *nb);
+void omap_mbox_put(struct omap_mbox *mbox, struct notifier_block *nb);
+
+void omap_mbox_save_ctx(struct omap_mbox *mbox);
+void omap_mbox_restore_ctx(struct omap_mbox *mbox);
+void omap_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq);
+void omap_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq);
+
+#endif /* OMAP_MAILBOX_H */