linux/drivers/mfd/mcp-core.c
Linus Torvalds 0195c00244 Disintegrate and delete asm/system.h
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Merge tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system

Pull "Disintegrate and delete asm/system.h" from David Howells:
 "Here are a bunch of patches to disintegrate asm/system.h into a set of
  separate bits to relieve the problem of circular inclusion
  dependencies.

  I've built all the working defconfigs from all the arches that I can
  and made sure that they don't break.

  The reason for these patches is that I recently encountered a circular
  dependency problem that came about when I produced some patches to
  optimise get_order() by rewriting it to use ilog2().

  This uses bitops - and on the SH arch asm/bitops.h drags in
  asm-generic/get_order.h by a circuituous route involving asm/system.h.

  The main difficulty seems to be asm/system.h.  It holds a number of
  low level bits with no/few dependencies that are commonly used (eg.
  memory barriers) and a number of bits with more dependencies that
  aren't used in many places (eg.  switch_to()).

  These patches break asm/system.h up into the following core pieces:

    (1) asm/barrier.h

        Move memory barriers here.  This already done for MIPS and Alpha.

    (2) asm/switch_to.h

        Move switch_to() and related stuff here.

    (3) asm/exec.h

        Move arch_align_stack() here.  Other process execution related bits
        could perhaps go here from asm/processor.h.

    (4) asm/cmpxchg.h

        Move xchg() and cmpxchg() here as they're full word atomic ops and
        frequently used by atomic_xchg() and atomic_cmpxchg().

    (5) asm/bug.h

        Move die() and related bits.

    (6) asm/auxvec.h

        Move AT_VECTOR_SIZE_ARCH here.

  Other arch headers are created as needed on a per-arch basis."

Fixed up some conflicts from other header file cleanups and moving code
around that has happened in the meantime, so David's testing is somewhat
weakened by that.  We'll find out anything that got broken and fix it..

* tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system: (38 commits)
  Delete all instances of asm/system.h
  Remove all #inclusions of asm/system.h
  Add #includes needed to permit the removal of asm/system.h
  Move all declarations of free_initmem() to linux/mm.h
  Disintegrate asm/system.h for OpenRISC
  Split arch_align_stack() out from asm-generic/system.h
  Split the switch_to() wrapper out of asm-generic/system.h
  Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h
  Create asm-generic/barrier.h
  Make asm-generic/cmpxchg.h #include asm-generic/cmpxchg-local.h
  Disintegrate asm/system.h for Xtensa
  Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt]
  Disintegrate asm/system.h for Tile
  Disintegrate asm/system.h for Sparc
  Disintegrate asm/system.h for SH
  Disintegrate asm/system.h for Score
  Disintegrate asm/system.h for S390
  Disintegrate asm/system.h for PowerPC
  Disintegrate asm/system.h for PA-RISC
  Disintegrate asm/system.h for MN10300
  ...
2012-03-28 15:58:21 -07:00

238 lines
5.6 KiB
C

/*
* 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 <linux/slab.h>
#include <linux/string.h>
#include <linux/mfd/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 struct bus_type mcp_bus_type = {
.name = "mcp",
.match = mcp_bus_match,
.probe = mcp_bus_probe,
.remove = mcp_bus_remove,
};
/**
* 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)
{
unsigned long flags;
spin_lock_irqsave(&mcp->lock, flags);
mcp->ops->set_telecom_divisor(mcp, div);
spin_unlock_irqrestore(&mcp->lock, flags);
}
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)
{
unsigned long flags;
spin_lock_irqsave(&mcp->lock, flags);
mcp->ops->set_audio_divisor(mcp, div);
spin_unlock_irqrestore(&mcp->lock, flags);
}
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)
{
unsigned long flags;
spin_lock_irqsave(&mcp->lock, flags);
if (mcp->use_count++ == 0)
mcp->ops->enable(mcp);
spin_unlock_irqrestore(&mcp->lock, flags);
}
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 = kzalloc(sizeof(struct mcp) + size, GFP_KERNEL);
if (mcp) {
spin_lock_init(&mcp->lock);
device_initialize(&mcp->attached_device);
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_add(struct mcp *mcp, void *pdata)
{
mcp->attached_device.platform_data = pdata;
dev_set_name(&mcp->attached_device, "mcp0");
return device_add(&mcp->attached_device);
}
EXPORT_SYMBOL(mcp_host_add);
void mcp_host_del(struct mcp *mcp)
{
device_del(&mcp->attached_device);
}
EXPORT_SYMBOL(mcp_host_del);
void mcp_host_free(struct mcp *mcp)
{
put_device(&mcp->attached_device);
}
EXPORT_SYMBOL(mcp_host_free);
int mcp_driver_register(struct mcp_driver *mcpdrv)
{
mcpdrv->drv.bus = &mcp_bus_type;
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");