1 /* SPDX-License-Identifier: GPL-2.0 */
2 /**
3 * \file drm_os_linux.h
4 * OS abstraction macros.
5 */
6
7 #include <linux/interrupt.h> /* For task queue support */
8 #include <linux/sched/signal.h>
9 #include <linux/delay.h>
10 #include <linux/io-64-nonatomic-lo-hi.h>
11
12 /** Current process ID */
13 #define DRM_CURRENTPID task_pid_nr(current)
14 #define DRM_UDELAY(d) udelay(d)
15 /** Read a byte from a MMIO region */
16 #define DRM_READ8(map, offset) readb(((void __iomem *)(map)->handle) + (offset))
17 /** Read a word from a MMIO region */
18 #define DRM_READ16(map, offset) readw(((void __iomem *)(map)->handle) + (offset))
19 /** Read a dword from a MMIO region */
20 #define DRM_READ32(map, offset) readl(((void __iomem *)(map)->handle) + (offset))
21 /** Write a byte into a MMIO region */
22 #define DRM_WRITE8(map, offset, val) writeb(val, ((void __iomem *)(map)->handle) + (offset))
23 /** Write a word into a MMIO region */
24 #define DRM_WRITE16(map, offset, val) writew(val, ((void __iomem *)(map)->handle) + (offset))
25 /** Write a dword into a MMIO region */
26 #define DRM_WRITE32(map, offset, val) writel(val, ((void __iomem *)(map)->handle) + (offset))
27
28 /** Read a qword from a MMIO region - be careful using these unless you really understand them */
29 #define DRM_READ64(map, offset) readq(((void __iomem *)(map)->handle) + (offset))
30 /** Write a qword into a MMIO region */
31 #define DRM_WRITE64(map, offset, val) writeq(val, ((void __iomem *)(map)->handle) + (offset))
32
33 #define DRM_WAIT_ON( ret, queue, timeout, condition ) \
34 do { \
35 DECLARE_WAITQUEUE(entry, current); \
36 unsigned long end = jiffies + (timeout); \
37 add_wait_queue(&(queue), &entry); \
38 \
39 for (;;) { \
40 __set_current_state(TASK_INTERRUPTIBLE); \
41 if (condition) \
42 break; \
43 if (time_after_eq(jiffies, end)) { \
44 ret = -EBUSY; \
45 break; \
46 } \
47 schedule_timeout((HZ/100 > 1) ? HZ/100 : 1); \
48 if (signal_pending(current)) { \
49 ret = -EINTR; \
50 break; \
51 } \
52 } \
53 __set_current_state(TASK_RUNNING); \
54 remove_wait_queue(&(queue), &entry); \
55 } while (0)