patch-2.1.51 linux/include/asm-ppc/dbdma.h

• Lines: 93
• Date: Sat Aug 16 09:51:09 1997
• Orig file: v2.1.50/linux/include/asm-ppc/dbdma.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.50/linux/include/asm-ppc/dbdma.h linux/include/asm-ppc/dbdma.h
@@ -0,0 +1,92 @@
+/*
+ * Definitions for using the Apple Descriptor-Based DMA controller
+ * in Power Macintosh computers.
+ *
+ * Copyright (C) 1996 Paul Mackerras.
+ */
+
+#ifndef _ASM_DBDMA_H_
+#define _ASM_DBDMA_H_
+/*
+ * DBDMA control/status registers.  All little-endian.
+ */
+struct dbdma_regs {
+    unsigned int control;	/* lets you change bits in status */
+    unsigned int status;	/* DMA and device status bits (see below) */
+    unsigned int cmdptr_hi;	/* upper 32 bits of command address */
+    unsigned int cmdptr;	/* (lower 32 bits of) command address (phys) */
+    unsigned int intr_sel;	/* select interrupt condition bit */
+    unsigned int br_sel;	/* select branch condition bit */
+    unsigned int wait_sel;	/* select wait condition bit */
+    unsigned int xfer_mode;
+    unsigned int data2ptr_hi;
+    unsigned int data2ptr;
+    unsigned int res1;
+    unsigned int address_hi;
+    unsigned int br_addr_hi;
+    unsigned int res2[3];
+};
+
+/* Bits in control and status registers */
+#define RUN	0x8000
+#define PAUSE	0x4000
+#define FLUSH	0x2000
+#define WAKE	0x1000
+#define DEAD	0x0800
+#define ACTIVE	0x0400
+#define BT	0x0100
+#define DEVSTAT	0x00ff
+
+/*
+ * DBDMA command structure.  These fields are all little-endian!
+ */
+struct dbdma_cmd {
+    unsigned short req_count;	/* requested byte transfer count */
+    unsigned short command;	/* command word (has bit-fields) */
+    unsigned int   phy_addr;	/* physical data address */
+    unsigned int   cmd_dep;	/* command-dependent field */
+    unsigned short res_count;	/* residual count after completion */
+    unsigned short xfer_status;	/* transfer status */
+};
+
+/* DBDMA command values in command field */
+#define OUTPUT_MORE	0	/* transfer memory data to stream */
+#define OUTPUT_LAST	0x1000	/* ditto followed by end marker */
+#define INPUT_MORE	0x2000	/* transfer stream data to memory */
+#define INPUT_LAST	0x3000	/* ditto, expect end marker */
+#define STORE_WORD	0x4000	/* write word (4 bytes) to device reg */
+#define LOAD_WORD	0x5000	/* read word (4 bytes) from device reg */
+#define DBDMA_NOP	0x6000	/* do nothing */
+#define DBDMA_STOP	0x7000	/* suspend processing */
+
+/* Key values in command field */
+#define KEY_STREAM0	0	/* usual data stream */
+#define KEY_STREAM1	0x100	/* control/status stream */
+#define KEY_STREAM2	0x200	/* device-dependent stream */
+#define KEY_STREAM3	0x300	/* device-dependent stream */
+#define KEY_REGS	0x500	/* device register space */
+#define KEY_SYSTEM	0x600	/* system memory-mapped space */
+#define KEY_DEVICE	0x700	/* device memory-mapped space */
+
+/* Interrupt control values in command field */
+#define INTR_NEVER	0	/* don't interrupt */
+#define INTR_IFSET	0x10	/* intr if condition bit is 1 */
+#define INTR_IFCLR	0x20	/* intr if condition bit is 0 */
+#define INTR_ALWAYS	0x30	/* always interrupt */
+
+/* Branch control values in command field */
+#define BR_NEVER	0	/* don't branch */
+#define BR_IFSET	0x4	/* branch if condition bit is 1 */
+#define BR_IFCLR	0x8	/* branch if condition bit is 0 */
+#define BR_ALWAYS	0xc	/* always branch */
+
+/* Wait control values in command field */
+#define WAIT_NEVER	0	/* don't wait */
+#define WAIT_IFSET	1	/* wait if condition bit is 1 */
+#define WAIT_IFCLR	2	/* wait if condition bit is 0 */
+#define WAIT_ALWAYS	3	/* always wait */
+
+/* Align an address for a DBDMA command structure */
+#define DBDMA_ALIGN(x)	(((unsigned)(x) + sizeof(struct dbdma_cmd) - 1) \
+			 & -sizeof(struct dbdma_cmd))
+#endif /* _ASM_DBDMA_H_ */