[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>
This commit is contained in:
Russell King
Russell King
parent
099d44e869
commit
a4e137ab14
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@ -752,6 +752,8 @@ source "drivers/hwmon/Kconfig"
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source "drivers/misc/Kconfig"
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source "drivers/mfd/Kconfig"
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source "drivers/media/Kconfig"
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source "drivers/video/Kconfig"
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@ -48,6 +48,8 @@ source "drivers/hwmon/Kconfig"
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source "drivers/misc/Kconfig"
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source "drivers/mfd/Kconfig"
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source "drivers/media/Kconfig"
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source "drivers/video/Kconfig"
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@ -26,7 +26,7 @@ obj-$(CONFIG_FB_INTEL) += video/intelfb/
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obj-$(CONFIG_SERIO) += input/serio/
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obj-y += serial/
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obj-$(CONFIG_PARPORT) += parport/
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obj-y += base/ block/ misc/ net/ media/
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obj-y += base/ block/ misc/ mfd/ net/ media/
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obj-$(CONFIG_NUBUS) += nubus/
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obj-$(CONFIG_ATM) += atm/
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obj-$(CONFIG_PPC_PMAC) += macintosh/
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@ -0,0 +1,10 @@
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#
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# Multifunction miscellaneous devices
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#
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menu "Multimedia Capabilities Port drivers"
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config MCP
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tristate
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endmenu
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@ -0,0 +1,5 @@
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#
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# Makefile for multifunction miscellaneous devices
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#
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obj-$(CONFIG_MCP) += mcp-core.o
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@ -0,0 +1,255 @@
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/*
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* linux/drivers/mfd/mcp-core.c
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*
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* Copyright (C) 2001 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License.
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*
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* Generic MCP (Multimedia Communications Port) layer. All MCP locking
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* is solely held within this file.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/smp.h>
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#include <linux/device.h>
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#include <asm/dma.h>
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#include <asm/system.h>
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#include "mcp.h"
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#define to_mcp(d) container_of(d, struct mcp, attached_device)
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#define to_mcp_driver(d) container_of(d, struct mcp_driver, drv)
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static int mcp_bus_match(struct device *dev, struct device_driver *drv)
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{
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return 1;
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}
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static int mcp_bus_probe(struct device *dev)
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{
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struct mcp *mcp = to_mcp(dev);
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struct mcp_driver *drv = to_mcp_driver(dev->driver);
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return drv->probe(mcp);
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}
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static int mcp_bus_remove(struct device *dev)
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{
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struct mcp *mcp = to_mcp(dev);
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struct mcp_driver *drv = to_mcp_driver(dev->driver);
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drv->remove(mcp);
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return 0;
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}
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static int mcp_bus_suspend(struct device *dev, pm_message_t state)
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{
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struct mcp *mcp = to_mcp(dev);
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int ret = 0;
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if (dev->driver) {
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struct mcp_driver *drv = to_mcp_driver(dev->driver);
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ret = drv->suspend(mcp, state);
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}
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return ret;
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}
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static int mcp_bus_resume(struct device *dev)
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{
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struct mcp *mcp = to_mcp(dev);
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int ret = 0;
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if (dev->driver) {
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struct mcp_driver *drv = to_mcp_driver(dev->driver);
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ret = drv->resume(mcp);
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}
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return ret;
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}
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static struct bus_type mcp_bus_type = {
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.name = "mcp",
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.match = mcp_bus_match,
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.suspend = mcp_bus_suspend,
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.resume = mcp_bus_resume,
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};
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/**
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* mcp_set_telecom_divisor - set the telecom divisor
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* @mcp: MCP interface structure
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* @div: SIB clock divisor
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*
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* Set the telecom divisor on the MCP interface. The resulting
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* sample rate is SIBCLOCK/div.
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*/
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void mcp_set_telecom_divisor(struct mcp *mcp, unsigned int div)
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{
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spin_lock_irq(&mcp->lock);
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mcp->ops->set_telecom_divisor(mcp, div);
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spin_unlock_irq(&mcp->lock);
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}
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EXPORT_SYMBOL(mcp_set_telecom_divisor);
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/**
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* mcp_set_audio_divisor - set the audio divisor
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* @mcp: MCP interface structure
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* @div: SIB clock divisor
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*
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* Set the audio divisor on the MCP interface.
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*/
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void mcp_set_audio_divisor(struct mcp *mcp, unsigned int div)
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{
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spin_lock_irq(&mcp->lock);
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mcp->ops->set_audio_divisor(mcp, div);
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spin_unlock_irq(&mcp->lock);
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}
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EXPORT_SYMBOL(mcp_set_audio_divisor);
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/**
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* mcp_reg_write - write a device register
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* @mcp: MCP interface structure
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* @reg: 4-bit register index
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* @val: 16-bit data value
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*
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* Write a device register. The MCP interface must be enabled
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* to prevent this function hanging.
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*/
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void mcp_reg_write(struct mcp *mcp, unsigned int reg, unsigned int val)
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{
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unsigned long flags;
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spin_lock_irqsave(&mcp->lock, flags);
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mcp->ops->reg_write(mcp, reg, val);
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spin_unlock_irqrestore(&mcp->lock, flags);
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}
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EXPORT_SYMBOL(mcp_reg_write);
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/**
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* mcp_reg_read - read a device register
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* @mcp: MCP interface structure
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* @reg: 4-bit register index
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*
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* Read a device register and return its value. The MCP interface
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* must be enabled to prevent this function hanging.
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*/
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unsigned int mcp_reg_read(struct mcp *mcp, unsigned int reg)
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{
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unsigned long flags;
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unsigned int val;
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spin_lock_irqsave(&mcp->lock, flags);
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val = mcp->ops->reg_read(mcp, reg);
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spin_unlock_irqrestore(&mcp->lock, flags);
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return val;
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}
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EXPORT_SYMBOL(mcp_reg_read);
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/**
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* mcp_enable - enable the MCP interface
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* @mcp: MCP interface to enable
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*
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* Enable the MCP interface. Each call to mcp_enable will need
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* a corresponding call to mcp_disable to disable the interface.
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*/
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void mcp_enable(struct mcp *mcp)
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{
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spin_lock_irq(&mcp->lock);
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if (mcp->use_count++ == 0)
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mcp->ops->enable(mcp);
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spin_unlock_irq(&mcp->lock);
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}
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EXPORT_SYMBOL(mcp_enable);
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/**
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* mcp_disable - disable the MCP interface
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* @mcp: MCP interface to disable
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*
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* Disable the MCP interface. The MCP interface will only be
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* disabled once the number of calls to mcp_enable matches the
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* number of calls to mcp_disable.
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*/
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void mcp_disable(struct mcp *mcp)
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{
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unsigned long flags;
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spin_lock_irqsave(&mcp->lock, flags);
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if (--mcp->use_count == 0)
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mcp->ops->disable(mcp);
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spin_unlock_irqrestore(&mcp->lock, flags);
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}
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EXPORT_SYMBOL(mcp_disable);
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static void mcp_release(struct device *dev)
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{
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struct mcp *mcp = container_of(dev, struct mcp, attached_device);
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kfree(mcp);
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}
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struct mcp *mcp_host_alloc(struct device *parent, size_t size)
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{
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struct mcp *mcp;
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mcp = kmalloc(sizeof(struct mcp) + size, GFP_KERNEL);
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if (mcp) {
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memset(mcp, 0, sizeof(struct mcp) + size);
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spin_lock_init(&mcp->lock);
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mcp->attached_device.parent = parent;
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mcp->attached_device.bus = &mcp_bus_type;
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mcp->attached_device.dma_mask = parent->dma_mask;
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mcp->attached_device.release = mcp_release;
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}
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return mcp;
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}
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EXPORT_SYMBOL(mcp_host_alloc);
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int mcp_host_register(struct mcp *mcp)
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{
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strcpy(mcp->attached_device.bus_id, "mcp0");
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return device_register(&mcp->attached_device);
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}
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EXPORT_SYMBOL(mcp_host_register);
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void mcp_host_unregister(struct mcp *mcp)
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{
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device_unregister(&mcp->attached_device);
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}
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EXPORT_SYMBOL(mcp_host_unregister);
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int mcp_driver_register(struct mcp_driver *mcpdrv)
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{
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mcpdrv->drv.bus = &mcp_bus_type;
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mcpdrv->drv.probe = mcp_bus_probe;
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mcpdrv->drv.remove = mcp_bus_remove;
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return driver_register(&mcpdrv->drv);
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}
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EXPORT_SYMBOL(mcp_driver_register);
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void mcp_driver_unregister(struct mcp_driver *mcpdrv)
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{
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driver_unregister(&mcpdrv->drv);
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}
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EXPORT_SYMBOL(mcp_driver_unregister);
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static int __init mcp_init(void)
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{
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return bus_register(&mcp_bus_type);
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}
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static void __exit mcp_exit(void)
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{
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bus_unregister(&mcp_bus_type);
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}
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module_init(mcp_init);
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module_exit(mcp_exit);
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MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
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MODULE_DESCRIPTION("Core multimedia communications port driver");
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MODULE_LICENSE("GPL");
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@ -0,0 +1,66 @@
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/*
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* linux/drivers/mfd/mcp.h
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*
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* Copyright (C) 2001 Russell King, All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License.
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*/
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#ifndef MCP_H
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#define MCP_H
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struct mcp_ops;
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struct mcp {
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struct module *owner;
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struct mcp_ops *ops;
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spinlock_t lock;
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int use_count;
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unsigned int sclk_rate;
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unsigned int rw_timeout;
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dma_device_t dma_audio_rd;
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dma_device_t dma_audio_wr;
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dma_device_t dma_telco_rd;
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dma_device_t dma_telco_wr;
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struct device attached_device;
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};
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struct mcp_ops {
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void (*set_telecom_divisor)(struct mcp *, unsigned int);
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void (*set_audio_divisor)(struct mcp *, unsigned int);
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void (*reg_write)(struct mcp *, unsigned int, unsigned int);
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unsigned int (*reg_read)(struct mcp *, unsigned int);
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void (*enable)(struct mcp *);
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void (*disable)(struct mcp *);
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};
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void mcp_set_telecom_divisor(struct mcp *, unsigned int);
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void mcp_set_audio_divisor(struct mcp *, unsigned int);
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void mcp_reg_write(struct mcp *, unsigned int, unsigned int);
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unsigned int mcp_reg_read(struct mcp *, unsigned int);
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void mcp_enable(struct mcp *);
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void mcp_disable(struct mcp *);
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#define mcp_get_sclk_rate(mcp) ((mcp)->sclk_rate)
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struct mcp *mcp_host_alloc(struct device *, size_t);
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int mcp_host_register(struct mcp *);
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void mcp_host_unregister(struct mcp *);
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struct mcp_driver {
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struct device_driver drv;
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int (*probe)(struct mcp *);
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void (*remove)(struct mcp *);
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int (*suspend)(struct mcp *, pm_message_t);
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int (*resume)(struct mcp *);
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};
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int mcp_driver_register(struct mcp_driver *);
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void mcp_driver_unregister(struct mcp_driver *);
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#define mcp_get_drvdata(mcp) dev_get_drvdata(&(mcp)->attached_device)
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#define mcp_set_drvdata(mcp,d) dev_set_drvdata(&(mcp)->attached_device, d)
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#define mcp_priv(mcp) ((void *)((mcp)+1))
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#endif
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