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