[mirror_ubuntu-artful-kernel.git] / include / drm / drm_os_linux.h

/**
 * \file drm_os_linux.h
 * OS abstraction macros.
 */

#include <linux/interrupt.h>	/* For task queue support */
#include <linux/sched/signal.h>
#include <linux/delay.h>

#ifndef readq
static inline u64 readq(void __iomem *reg)
{
	return ((u64) readl(reg)) | (((u64) readl(reg + 4UL)) << 32);
}

static inline void writeq(u64 val, void __iomem *reg)
{
	writel(val & 0xffffffff, reg);
	writel(val >> 32, reg + 0x4UL);
}
#endif

/** Current process ID */
#define DRM_CURRENTPID			task_pid_nr(current)
#define DRM_UDELAY(d)			udelay(d)
/** Read a byte from a MMIO region */
#define DRM_READ8(map, offset)		readb(((void __iomem *)(map)->handle) + (offset))
/** Read a word from a MMIO region */
#define DRM_READ16(map, offset)         readw(((void __iomem *)(map)->handle) + (offset))
/** Read a dword from a MMIO region */
#define DRM_READ32(map, offset)		readl(((void __iomem *)(map)->handle) + (offset))
/** Write a byte into a MMIO region */
#define DRM_WRITE8(map, offset, val)	writeb(val, ((void __iomem *)(map)->handle) + (offset))
/** Write a word into a MMIO region */
#define DRM_WRITE16(map, offset, val)   writew(val, ((void __iomem *)(map)->handle) + (offset))
/** Write a dword into a MMIO region */
#define DRM_WRITE32(map, offset, val)	writel(val, ((void __iomem *)(map)->handle) + (offset))

/** Read a qword from a MMIO region - be careful using these unless you really understand them */
#define DRM_READ64(map, offset)		readq(((void __iomem *)(map)->handle) + (offset))
/** Write a qword into a MMIO region */
#define DRM_WRITE64(map, offset, val)	writeq(val, ((void __iomem *)(map)->handle) + (offset))

#define DRM_WAIT_ON( ret, queue, timeout, condition )		\
do {								\
	DECLARE_WAITQUEUE(entry, current);			\
	unsigned long end = jiffies + (timeout);		\
	add_wait_queue(&(queue), &entry);			\
								\
	for (;;) {						\
		__set_current_state(TASK_INTERRUPTIBLE);	\
		if (condition)					\
			break;					\
		if (time_after_eq(jiffies, end)) {		\
			ret = -EBUSY;				\
			break;					\
		}						\
		schedule_timeout((HZ/100 > 1) ? HZ/100 : 1);	\
		if (signal_pending(current)) {			\
			ret = -EINTR;				\
			break;					\
		}						\
	}							\
	__set_current_state(TASK_RUNNING);			\
	remove_wait_queue(&(queue), &entry);			\
} while (0)
Commit	Line	Data
1da177e4 LT	1	/**
	2	* \file drm_os_linux.h
	3	* OS abstraction macros.
	4	*/
	5
1da177e4	6	#include <linux/interrupt.h> /* For task queue support */
174cd4b1	7	#include <linux/sched/signal.h>
1da177e4 LT	8	#include <linux/delay.h>
1da177e4 LT	9
87f0da55	10	#ifndef readq
522b5cc7	11	static inline u64 readq(void __iomem *reg)
87f0da55 DA	12	{
	13	return ((u64) readl(reg)) \| (((u64) readl(reg + 4UL)) << 32);
	14	}
	15
522b5cc7	16	static inline void writeq(u64 val, void __iomem *reg)
87f0da55 DA	17	{
	18	writel(val & 0xffffffff, reg);
	19	writel(val >> 32, reg + 0x4UL);
	20	}
	21	#endif
	22
1da177e4	23	/** Current process ID */
ba25f9dc	24	#define DRM_CURRENTPID task_pid_nr(current)
1da177e4 LT	25	#define DRM_UDELAY(d) udelay(d)
	26	/** Read a byte from a MMIO region */
	27	#define DRM_READ8(map, offset) readb(((void __iomem *)(map)->handle) + (offset))
	28	/** Read a word from a MMIO region */
	29	#define DRM_READ16(map, offset) readw(((void __iomem *)(map)->handle) + (offset))
	30	/** Read a dword from a MMIO region */
	31	#define DRM_READ32(map, offset) readl(((void __iomem *)(map)->handle) + (offset))
	32	/** Write a byte into a MMIO region */
	33	#define DRM_WRITE8(map, offset, val) writeb(val, ((void __iomem *)(map)->handle) + (offset))
	34	/** Write a word into a MMIO region */
	35	#define DRM_WRITE16(map, offset, val) writew(val, ((void __iomem *)(map)->handle) + (offset))
	36	/** Write a dword into a MMIO region */
	37	#define DRM_WRITE32(map, offset, val) writel(val, ((void __iomem *)(map)->handle) + (offset))
87f0da55 DA	38
	39	/** Read a qword from a MMIO region - be careful using these unless you really understand them */
	40	#define DRM_READ64(map, offset) readq(((void __iomem *)(map)->handle) + (offset))
	41	/** Write a qword into a MMIO region */
	42	#define DRM_WRITE64(map, offset, val) writeq(val, ((void __iomem *)(map)->handle) + (offset))
	43
1da177e4 LT	44	#define DRM_WAIT_ON( ret, queue, timeout, condition ) \
	45	do { \
	46	DECLARE_WAITQUEUE(entry, current); \
	47	unsigned long end = jiffies + (timeout); \
	48	add_wait_queue(&(queue), &entry); \
	49	\
	50	for (;;) { \
	51	__set_current_state(TASK_INTERRUPTIBLE); \
	52	if (condition) \
	53	break; \
	54	if (time_after_eq(jiffies, end)) { \
	55	ret = -EBUSY; \
	56	break; \
	57	} \
	58	schedule_timeout((HZ/100 > 1) ? HZ/100 : 1); \
	59	if (signal_pending(current)) { \
	60	ret = -EINTR; \
	61	break; \
	62	} \
	63	} \
	64	__set_current_state(TASK_RUNNING); \
	65	remove_wait_queue(&(queue), &entry); \
	66	} while (0)