LXR linux/include/drm/drm_os

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