linux/sound/pci/asihpi/hpios.h

/******************************************************************************

    AudioScience HPI driver
    Copyright (C) 1997-2011  AudioScience Inc. <support@audioscience.com>

    This program is free software; you can redistribute it and/or modify
    it under the terms of version 2 of the GNU General Public License as
    published by the Free Software Foundation;

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

HPI Operating System Specific macros for Linux Kernel driver

(C) Copyright AudioScience Inc. 1997-2003
******************************************************************************/
#ifndef _HPIOS_H_
#define _HPIOS_H_

#undef HPI_OS_LINUX_KERNEL
#define HPI_OS_LINUX_KERNEL

#define HPI_OS_DEFINED
#define HPI_BUILD_KERNEL_MODE

#include <linux/io.h>
#include <asm/system.h>
#include <linux/ioctl.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/device.h>
#include <linux/firmware.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/mutex.h>

#define HPI_NO_OS_FILE_OPS

#ifdef CONFIG_64BIT
#define HPI64BIT
#endif

/** Details of a memory area allocated with  pci_alloc_consistent
Need all info for parameters to pci_free_consistent
*/
struct consistent_dma_area {
	struct device *pdev;
	/* looks like dma-mapping dma_devres ?! */
	size_t size;
	void *vaddr;
	dma_addr_t dma_handle;
};

static inline u16 hpios_locked_mem_get_phys_addr(struct consistent_dma_area
	*locked_mem_handle, u32 *p_physical_addr)
{
	*p_physical_addr = locked_mem_handle->dma_handle;
	return 0;
}

static inline u16 hpios_locked_mem_get_virt_addr(struct consistent_dma_area
	*locked_mem_handle, void **pp_virtual_addr)
{
	*pp_virtual_addr = locked_mem_handle->vaddr;
	return 0;
}

static inline u16 hpios_locked_mem_valid(struct consistent_dma_area
	*locked_mem_handle)
{
	return locked_mem_handle->size != 0;
}

struct hpi_ioctl_linux {
	void __user *phm;
	void __user *phr;
};

/* Conflict?: H is already used by a number of drivers hid, bluetooth hci,
   and some sound drivers sb16, hdsp, emu10k. AFAIK 0xFC is ununsed command
*/
#define HPI_IOCTL_LINUX _IOWR('H', 0xFC, struct hpi_ioctl_linux)

#define HPI_DEBUG_FLAG_ERROR   KERN_ERR
#define HPI_DEBUG_FLAG_WARNING KERN_WARNING
#define HPI_DEBUG_FLAG_NOTICE  KERN_NOTICE
#define HPI_DEBUG_FLAG_INFO    KERN_INFO
#define HPI_DEBUG_FLAG_DEBUG   KERN_DEBUG
#define HPI_DEBUG_FLAG_VERBOSE KERN_DEBUG	/* kernel has no verbose */

#include <linux/spinlock.h>

#define HPI_LOCKING

struct hpios_spinlock {
	spinlock_t lock;	/* SEE hpios_spinlock */
	int lock_context;
};

/* The reason for all this evilness is that ALSA calls some of a drivers
 * operators in atomic context, and some not.  But all our functions channel
 * through the HPI_Message conduit, so we can't handle the different context
 * per function
 */
#define IN_LOCK_BH 1
#define IN_LOCK_IRQ 0
static inline void cond_lock(struct hpios_spinlock *l)
{
	if (irqs_disabled()) {
		/* NO bh or isr can execute on this processor,
		   so ordinary lock will do
		 */
		spin_lock(&((l)->lock));
		l->lock_context = IN_LOCK_IRQ;
	} else {
		spin_lock_bh(&((l)->lock));
		l->lock_context = IN_LOCK_BH;
	}
}

static inline void cond_unlock(struct hpios_spinlock *l)
{
	if (l->lock_context == IN_LOCK_BH)
		spin_unlock_bh(&((l)->lock));
	else
		spin_unlock(&((l)->lock));
}

#define hpios_msgxlock_init(obj)      spin_lock_init(&(obj)->lock)
#define hpios_msgxlock_lock(obj)   cond_lock(obj)
#define hpios_msgxlock_unlock(obj) cond_unlock(obj)

#define hpios_dsplock_init(obj)       spin_lock_init(&(obj)->dsp_lock.lock)
#define hpios_dsplock_lock(obj)    cond_lock(&(obj)->dsp_lock)
#define hpios_dsplock_unlock(obj)  cond_unlock(&(obj)->dsp_lock)

#ifdef CONFIG_SND_DEBUG
#define HPI_BUILD_DEBUG
#endif

#define HPI_ALIST_LOCKING
#define hpios_alistlock_init(obj)    spin_lock_init(&((obj)->list_lock.lock))
#define hpios_alistlock_lock(obj) spin_lock(&((obj)->list_lock.lock))
#define hpios_alistlock_unlock(obj) spin_unlock(&((obj)->list_lock.lock))

struct snd_card;

/** pci drvdata points to an instance of this struct */
struct hpi_adapter {
	struct hpi_adapter_obj *adapter;
	struct snd_card *snd_card;

	/* mutex prevents contention for one card
	   between multiple user programs (via ioctl) */
	struct mutex mutex;
	char *p_buffer;
	size_t buffer_size;
};

#endif