[MFD] Add multimedia communication port core support

Add support for the core of the multimedia communication port
framework.  This is a port used to communicate with devices
with two DMA paths and a control path.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

4 files changed, 336 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
new file mode 100644
index 000000000000..e7d1f31aafff
--- /dev/null
+++ b/drivers/mfd/Kconfig
@@ -0,0 +1,10 @@
+#
+# Multifunction miscellaneous devices
+#
+
+menu "Multimedia Capabilities Port drivers"
+
+config MCP
+        tristate
+
+endmenu
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
new file mode 100644
index 000000000000..ff31f281e28c
--- /dev/null
+++ b/drivers/mfd/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for multifunction miscellaneous devices
+#
+
+obj-$(CONFIG_MCP)               += mcp-core.o
diff --git a/drivers/mfd/mcp-core.c b/drivers/mfd/mcp-core.c
new file mode 100644
index 000000000000..c75d713c01e4
--- /dev/null
+++ b/drivers/mfd/mcp-core.c
@@ -0,0 +1,255 @@
+/*
+ *  linux/drivers/mfd/mcp-core.c
+ *
+ *  Copyright (C) 2001 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+ *
+ *  Generic MCP (Multimedia Communications Port) layer.  All MCP locking
+ *  is solely held within this file.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/smp.h>
+#include <linux/device.h>
+
+#include <asm/dma.h>
+#include <asm/system.h>
+
+#include "mcp.h"
+
+#define to_mcp(d)               container_of(d, struct mcp, attached_device)
+#define to_mcp_driver(d)        container_of(d, struct mcp_driver, drv)
+
+static int mcp_bus_match(struct device *dev, struct device_driver *drv)
+{
+        return 1;
+}
+
+static int mcp_bus_probe(struct device *dev)
+{
+        struct mcp *mcp = to_mcp(dev);
+        struct mcp_driver *drv = to_mcp_driver(dev->driver);
+
+        return drv->probe(mcp);
+}
+
+static int mcp_bus_remove(struct device *dev)
+{
+        struct mcp *mcp = to_mcp(dev);
+        struct mcp_driver *drv = to_mcp_driver(dev->driver);
+
+        drv->remove(mcp);
+        return 0;
+}
+
+static int mcp_bus_suspend(struct device *dev, pm_message_t state)
+{
+        struct mcp *mcp = to_mcp(dev);
+        int ret = 0;
+
+        if (dev->driver) {
+                struct mcp_driver *drv = to_mcp_driver(dev->driver);
+
+                ret = drv->suspend(mcp, state);
+        }
+        return ret;
+}
+
+static int mcp_bus_resume(struct device *dev)
+{
+        struct mcp *mcp = to_mcp(dev);
+        int ret = 0;
+
+        if (dev->driver) {
+                struct mcp_driver *drv = to_mcp_driver(dev->driver);
+
+                ret = drv->resume(mcp);
+        }
+        return ret;
+}
+
+static struct bus_type mcp_bus_type = {
+        .name           = "mcp",
+        .match          = mcp_bus_match,
+        .suspend        = mcp_bus_suspend,
+        .resume         = mcp_bus_resume,
+};
+
+/**
+ *      mcp_set_telecom_divisor - set the telecom divisor
+ *      @mcp: MCP interface structure
+ *      @div: SIB clock divisor
+ *
+ *      Set the telecom divisor on the MCP interface.  The resulting
+ *      sample rate is SIBCLOCK/div.
+ */
+void mcp_set_telecom_divisor(struct mcp *mcp, unsigned int div)
+{
+        spin_lock_irq(&mcp->lock);
+        mcp->ops->set_telecom_divisor(mcp, div);
+        spin_unlock_irq(&mcp->lock);
+}
+EXPORT_SYMBOL(mcp_set_telecom_divisor);
+
+/**
+ *      mcp_set_audio_divisor - set the audio divisor
+ *      @mcp: MCP interface structure
+ *      @div: SIB clock divisor
+ *
+ *      Set the audio divisor on the MCP interface.
+ */
+void mcp_set_audio_divisor(struct mcp *mcp, unsigned int div)
+{
+        spin_lock_irq(&mcp->lock);
+        mcp->ops->set_audio_divisor(mcp, div);
+        spin_unlock_irq(&mcp->lock);
+}
+EXPORT_SYMBOL(mcp_set_audio_divisor);
+
+/**
+ *      mcp_reg_write - write a device register
+ *      @mcp: MCP interface structure
+ *      @reg: 4-bit register index
+ *      @val: 16-bit data value
+ *
+ *      Write a device register.  The MCP interface must be enabled
+ *      to prevent this function hanging.
+ */
+void mcp_reg_write(struct mcp *mcp, unsigned int reg, unsigned int val)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&mcp->lock, flags);
+        mcp->ops->reg_write(mcp, reg, val);
+        spin_unlock_irqrestore(&mcp->lock, flags);
+}
+EXPORT_SYMBOL(mcp_reg_write);
+
+/**
+ *      mcp_reg_read - read a device register
+ *      @mcp: MCP interface structure
+ *      @reg: 4-bit register index
+ *
+ *      Read a device register and return its value.  The MCP interface
+ *      must be enabled to prevent this function hanging.
+ */
+unsigned int mcp_reg_read(struct mcp *mcp, unsigned int reg)
+{
+        unsigned long flags;
+        unsigned int val;
+
+        spin_lock_irqsave(&mcp->lock, flags);
+        val = mcp->ops->reg_read(mcp, reg);
+        spin_unlock_irqrestore(&mcp->lock, flags);
+
+        return val;
+}
+EXPORT_SYMBOL(mcp_reg_read);
+
+/**
+ *      mcp_enable - enable the MCP interface
+ *      @mcp: MCP interface to enable
+ *
+ *      Enable the MCP interface.  Each call to mcp_enable will need
+ *      a corresponding call to mcp_disable to disable the interface.
+ */
+void mcp_enable(struct mcp *mcp)
+{
+        spin_lock_irq(&mcp->lock);
+        if (mcp->use_count++ == 0)
+                mcp->ops->enable(mcp);
+        spin_unlock_irq(&mcp->lock);
+}
+EXPORT_SYMBOL(mcp_enable);
+
+/**
+ *      mcp_disable - disable the MCP interface
+ *      @mcp: MCP interface to disable
+ *
+ *      Disable the MCP interface.  The MCP interface will only be
+ *      disabled once the number of calls to mcp_enable matches the
+ *      number of calls to mcp_disable.
+ */
+void mcp_disable(struct mcp *mcp)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&mcp->lock, flags);
+        if (--mcp->use_count == 0)
+                mcp->ops->disable(mcp);
+        spin_unlock_irqrestore(&mcp->lock, flags);
+}
+EXPORT_SYMBOL(mcp_disable);
+
+static void mcp_release(struct device *dev)
+{
+        struct mcp *mcp = container_of(dev, struct mcp, attached_device);
+
+        kfree(mcp);
+}
+
+struct mcp *mcp_host_alloc(struct device *parent, size_t size)
+{
+        struct mcp *mcp;
+
+        mcp = kmalloc(sizeof(struct mcp) + size, GFP_KERNEL);
+        if (mcp) {
+                memset(mcp, 0, sizeof(struct mcp) + size);
+                spin_lock_init(&mcp->lock);
+                mcp->attached_device.parent = parent;
+                mcp->attached_device.bus = &mcp_bus_type;
+                mcp->attached_device.dma_mask = parent->dma_mask;
+                mcp->attached_device.release = mcp_release;
+        }
+        return mcp;
+}
+EXPORT_SYMBOL(mcp_host_alloc);
+
+int mcp_host_register(struct mcp *mcp)
+{
+        strcpy(mcp->attached_device.bus_id, "mcp0");
+        return device_register(&mcp->attached_device);
+}
+EXPORT_SYMBOL(mcp_host_register);
+
+void mcp_host_unregister(struct mcp *mcp)
+{
+        device_unregister(&mcp->attached_device);
+}
+EXPORT_SYMBOL(mcp_host_unregister);
+
+int mcp_driver_register(struct mcp_driver *mcpdrv)
+{
+        mcpdrv->drv.bus = &mcp_bus_type;
+        mcpdrv->drv.probe = mcp_bus_probe;
+        mcpdrv->drv.remove = mcp_bus_remove;
+        return driver_register(&mcpdrv->drv);
+}
+EXPORT_SYMBOL(mcp_driver_register);
+
+void mcp_driver_unregister(struct mcp_driver *mcpdrv)
+{
+        driver_unregister(&mcpdrv->drv);
+}
+EXPORT_SYMBOL(mcp_driver_unregister);
+
+static int __init mcp_init(void)
+{
+        return bus_register(&mcp_bus_type);
+}
+
+static void __exit mcp_exit(void)
+{
+        bus_unregister(&mcp_bus_type);
+}
+
+module_init(mcp_init);
+module_exit(mcp_exit);
+
+MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
+MODULE_DESCRIPTION("Core multimedia communications port driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/mfd/mcp.h b/drivers/mfd/mcp.h
new file mode 100644
index 000000000000..c093a93b8808
--- /dev/null
+++ b/drivers/mfd/mcp.h
@@ -0,0 +1,66 @@
+/*
+ *  linux/drivers/mfd/mcp.h
+ *
+ *  Copyright (C) 2001 Russell King, All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+ */
+#ifndef MCP_H
+#define MCP_H
+
+struct mcp_ops;
+
+struct mcp {
+        struct module   *owner;
+        struct mcp_ops  *ops;
+        spinlock_t      lock;
+        int             use_count;
+        unsigned int    sclk_rate;
+        unsigned int    rw_timeout;
+        dma_device_t    dma_audio_rd;
+        dma_device_t    dma_audio_wr;
+        dma_device_t    dma_telco_rd;
+        dma_device_t    dma_telco_wr;
+        struct device   attached_device;
+};
+
+struct mcp_ops {
+        void            (*set_telecom_divisor)(struct mcp *, unsigned int);
+        void            (*set_audio_divisor)(struct mcp *, unsigned int);
+        void            (*reg_write)(struct mcp *, unsigned int, unsigned int);
+        unsigned int    (*reg_read)(struct mcp *, unsigned int);
+        void            (*enable)(struct mcp *);
+        void            (*disable)(struct mcp *);
+};
+
+void mcp_set_telecom_divisor(struct mcp *, unsigned int);
+void mcp_set_audio_divisor(struct mcp *, unsigned int);
+void mcp_reg_write(struct mcp *, unsigned int, unsigned int);
+unsigned int mcp_reg_read(struct mcp *, unsigned int);
+void mcp_enable(struct mcp *);
+void mcp_disable(struct mcp *);
+#define mcp_get_sclk_rate(mcp)  ((mcp)->sclk_rate)
+
+struct mcp *mcp_host_alloc(struct device *, size_t);
+int mcp_host_register(struct mcp *);
+void mcp_host_unregister(struct mcp *);
+
+struct mcp_driver {
+        struct device_driver drv;
+        int (*probe)(struct mcp *);
+        void (*remove)(struct mcp *);
+        int (*suspend)(struct mcp *, pm_message_t);
+        int (*resume)(struct mcp *);
+};
+
+int mcp_driver_register(struct mcp_driver *);
+void mcp_driver_unregister(struct mcp_driver *);
+
+#define mcp_get_drvdata(mcp)    dev_get_drvdata(&(mcp)->attached_device)
+#define mcp_set_drvdata(mcp,d)  dev_set_drvdata(&(mcp)->attached_device, d)
+
+#define mcp_priv(mcp)           ((void *)((mcp)+1))
+
+#endif