include/drm/drm_os_linux.h

   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
  10 static inline u64 readq(void __iomem *reg)
  11 {
  12         return ((u64) readl(reg)) | (((u64) readl(reg + 4UL)) << 32);
  13 }
  14
  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)