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