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- /**
- * \file drm_os_linux.h
- * OS abstraction macros.
- */
- #include <linux/interrupt.h> /* For task queue support */
- #include <linux/delay.h>
- #ifndef readq
- static inline u64 readq(void __iomem *reg)
- {
- return ((u64) readl(reg)) | (((u64) readl(reg + 4UL)) << 32);
- }
- static inline void writeq(u64 val, void __iomem *reg)
- {
- writel(val & 0xffffffff, reg);
- writel(val >> 32, reg + 0x4UL);
- }
- #endif
- /** Current process ID */
- #define DRM_CURRENTPID task_pid_nr(current)
- #define DRM_UDELAY(d) udelay(d)
- /** Read a byte from a MMIO region */
- #define DRM_READ8(map, offset) readb(((void __iomem *)(map)->handle) + (offset))
- /** Read a word from a MMIO region */
- #define DRM_READ16(map, offset) readw(((void __iomem *)(map)->handle) + (offset))
- /** Read a dword from a MMIO region */
- #define DRM_READ32(map, offset) readl(((void __iomem *)(map)->handle) + (offset))
- /** Write a byte into a MMIO region */
- #define DRM_WRITE8(map, offset, val) writeb(val, ((void __iomem *)(map)->handle) + (offset))
- /** Write a word into a MMIO region */
- #define DRM_WRITE16(map, offset, val) writew(val, ((void __iomem *)(map)->handle) + (offset))
- /** Write a dword into a MMIO region */
- #define DRM_WRITE32(map, offset, val) writel(val, ((void __iomem *)(map)->handle) + (offset))
- /** Read a qword from a MMIO region - be careful using these unless you really understand them */
- #define DRM_READ64(map, offset) readq(((void __iomem *)(map)->handle) + (offset))
- /** Write a qword into a MMIO region */
- #define DRM_WRITE64(map, offset, val) writeq(val, ((void __iomem *)(map)->handle) + (offset))
- #define DRM_WAIT_ON( ret, queue, timeout, condition ) \
- do { \
- DECLARE_WAITQUEUE(entry, current); \
- unsigned long end = jiffies + (timeout); \
- add_wait_queue(&(queue), &entry); \
- \
- for (;;) { \
- __set_current_state(TASK_INTERRUPTIBLE); \
- if (condition) \
- break; \
- if (time_after_eq(jiffies, end)) { \
- ret = -EBUSY; \
- break; \
- } \
- schedule_timeout((HZ/100 > 1) ? HZ/100 : 1); \
- if (signal_pending(current)) { \
- ret = -EINTR; \
- break; \
- } \
- } \
- __set_current_state(TASK_RUNNING); \
- remove_wait_queue(&(queue), &entry); \
- } while (0)
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