xref: /dragonfly/sys/dev/drm/include/drm/drm_os_linux.h (revision ff038999)
1 /**
2  * \file drm_os_dragonfly.h
3  * OS abstraction macros.
4  */
5 
6 #include <sys/param.h>
7 #include <sys/endian.h>
8 #include <sys/systm.h>
9 #include <sys/serialize.h>
10 #include <linux/interrupt.h>	/* For task queue support */
11 #include <linux/delay.h>
12 
13 /* Handle the DRM options from kernel config. */
14 #ifdef __DragonFly__
15 #include "opt_drm.h"
16 #ifdef DRM_DEBUG
17 #  if DRM_DEBUG>1
18 #    define DRM_DEBUG_DEFAULT_ON 2
19 #  else
20 #    define DRM_DEBUG_DEFAULT_ON 1
21 #  endif
22 #undef DRM_DEBUG
23 #else /* !DRM_DEBUG */
24 #  define DRM_DEBUG_DEFAULT_ON 0
25 #endif /* DRM_DEBUG */
26 #endif /* __DragonFly__ */
27 
28 #ifndef readq
29 static inline u64 readq(void __iomem *reg)
30 {
31 	return ((u64) readl(reg)) | (((u64) readl(reg + 4UL)) << 32);
32 }
33 
34 static inline void writeq(u64 val, void __iomem *reg)
35 {
36 	writel(val & 0xffffffff, reg);
37 	writel(val >> 32, reg + 0x4UL);
38 }
39 #endif
40 
41 /** Current process ID */
42 #define DRM_CURRENTPID			(curproc != NULL ? curproc->p_pid : -1)
43 #define DRM_UDELAY(d)			DELAY(d)
44 /** Read a byte from a MMIO region */
45 #define DRM_READ8(map, offset)		readb(((void __iomem *)(map)->handle) + (offset))
46 /** Read a word from a MMIO region */
47 #define DRM_READ16(map, offset)         readw(((void __iomem *)(map)->handle) + (offset))
48 /** Read a dword from a MMIO region */
49 #define DRM_READ32(map, offset)		readl(((void __iomem *)(map)->handle) + (offset))
50 /** Write a byte into a MMIO region */
51 #define DRM_WRITE8(map, offset, val)	writeb(val, ((void __iomem *)(map)->handle) + (offset))
52 /** Write a word into a MMIO region */
53 #define DRM_WRITE16(map, offset, val)   writew(val, ((void __iomem *)(map)->handle) + (offset))
54 /** Write a dword into a MMIO region */
55 #define DRM_WRITE32(map, offset, val)					\
56 	*(volatile u_int32_t *)(((vm_offset_t)(map)->handle) +		\
57 	    (vm_offset_t)(offset)) = htole32(val)
58 
59 /** Read a qword from a MMIO region - be careful using these unless you really understand them */
60 #define DRM_READ64(map, offset)		readq(((void __iomem *)(map)->handle) + (offset))
61 /** Write a qword into a MMIO region */
62 #define DRM_WRITE64(map, offset, val)	writeq(val, ((void __iomem *)(map)->handle) + (offset))
63 
64 #define DRM_WAIT_ON( ret, queue, timeout, condition )		\
65 do {								\
66 	wait_queue_t entry = {					\
67 		.private	= current,			\
68 		.func		= default_wake_function,	\
69 	};							\
70 	unsigned long end = jiffies + (timeout);		\
71 	add_wait_queue(&(queue), &entry);			\
72 								\
73 	for (;;) {						\
74 		__set_current_state(TASK_INTERRUPTIBLE);	\
75 		if (condition)					\
76 			break;					\
77 		if (time_after_eq(jiffies, end)) {		\
78 			ret = -EBUSY;				\
79 			break;					\
80 		}						\
81 		schedule_timeout((HZ/100 > 1) ? HZ/100 : 1);	\
82 		if (signal_pending(current)) {			\
83 			ret = -EINTR;				\
84 			break;					\
85 		}						\
86 	}							\
87 	__set_current_state(TASK_RUNNING);			\
88 	remove_wait_queue(&(queue), &entry);			\
89 } while (0)
90