These changes are the raw update to qemu-2.6.

[kvmfornfv.git] / qemu / roms / ipxe / src / arch / x86 / include / ipxe / pit8254.h

diff --git a/qemu/roms/ipxe/src/arch/x86/include/ipxe/pit8254.h b/qemu/roms/ipxe/src/arch/x86/include/ipxe/pit8254.h
new file mode 100644 (file)
index 0000000..00b0ab1
--- /dev/null
+++ b/qemu/roms/ipxe/src/arch/x86/include/ipxe/pit8254.h
@@ -0,0 +1,81 @@
+#ifndef _IPXE_PIT8254_H
+#define _IPXE_PIT8254_H
+
+/** @file
+ *
+ * 8254 Programmable Interval Timer
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+/** IRQ0 channel */
+#define PIT8254_CH_IRQ0 0
+
+/** PC speaker channel */
+#define PIT8254_CH_SPKR 2
+
+/** Timer frequency (1.193182MHz) */
+#define PIT8254_HZ 1193182UL
+
+/** Data port */
+#define PIT8254_DATA(channel) ( 0x40 + (channel) )
+
+/** Mode/command register */
+#define PIT8254_CMD 0x43
+
+/** Select channel */
+#define PIT8254_CMD_CHANNEL(channel) ( (channel) << 6 )
+
+/** Access modes */
+#define PIT8254_CMD_ACCESS_LATCH 0x00  /**< Latch count value command */
+#define PIT8254_CMD_ACCESS_LO  0x10    /**< Low byte only */
+#define PIT8254_CMD_ACCESS_HI  0x20    /**< High byte only */
+#define PIT8254_CMD_ACCESS_LOHI        0x30    /**< Low-byte, high-byte pair */
+
+/* Operating modes */
+#define PIT8254_CMD_OP_TERMINAL        0x00    /**< Interrupt on terminal count */
+#define PIT8254_CMD_OP_ONESHOT 0x02    /**< Hardware re-triggerable one-shot */
+#define PIT8254_CMD_OP_RATE    0x04    /**< Rate generator */
+#define PIT8254_CMD_OP_SQUARE  0x06    /**< Square wave generator */
+#define PIT8254_CMD_OP_SWSTROBE        0x08    /**< Software triggered strobe */
+#define PIT8254_CMD_OP_HWSTROBE        0x0a    /**< Hardware triggered strobe */
+#define PIT8254_CMD_OP_RATE2   0x0c    /**< Rate generator (duplicate) */
+#define PIT8254_CMD_OP_SQUARE2 0x0e    /**< Square wave generator (duplicate)*/
+
+/** Binary mode */
+#define PIT8254_CMD_BINARY 0x00
+
+/** BCD mode */
+#define PIT8254_CMD_BCD 0x01
+
+/** PC speaker control register */
+#define PIT8254_SPKR 0x61
+
+/** PC speaker channel gate */
+#define PIT8254_SPKR_GATE 0x01
+
+/** PC speaker enabled */
+#define PIT8254_SPKR_ENABLE 0x02
+
+/** PC speaker channel output */
+#define PIT8254_SPKR_OUT 0x20
+
+extern void pit8254_speaker_delay ( unsigned int ticks );
+
+/**
+ * Delay for a fixed number of microseconds
+ *
+ * @v usecs            Number of microseconds for which to delay
+ */
+static inline __attribute__ (( always_inline )) void
+pit8254_udelay ( unsigned long usecs ) {
+
+       /* Delays are invariably compile-time constants; force the
+        * multiplication and division to take place at compilation
+        * time rather than runtime.
+        */
+       pit8254_speaker_delay ( ( usecs * PIT8254_HZ ) / 1000000 );
+}
+
+#endif /* _IPXE_PIT8254_H */