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
readq(void __iomem * reg)10 static inline u64 readq(void __iomem *reg)
11 {
12 return ((u64) readl(reg)) | (((u64) readl(reg + 4UL)) << 32);
13 }
14
writeq(u64 val,void __iomem * reg)15 static 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 ) \
44 do { \
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