patch-2.1.132 linux/include/asm-i386/mca_dma.h

• Lines: 127
• Date: Thu Dec 17 09:06:24 1998
• Orig file: v2.1.131/linux/include/asm-i386/mca_dma.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.131/linux/include/asm-i386/mca_dma.h linux/include/asm-i386/mca_dma.h
@@ -0,0 +1,126 @@
+#ifndef MCA_DMA_H
+#define MCA_DMA_H
+
+#include <asm/io.h>
+#include <linux/ioport.h>
+
+/*
+ * Microchannel specific DMA stuff.  DMA on an MCA machine is fairly similar to
+ *   standard PC dma, but it certainly has its quirks.  DMA register addresses
+ *   are in a different place and there are some added functions.  Most of this
+ *   should be pretty obvious on inspection.  Note that the user must divide
+ *   count by 2 when using 16-bit dma; that is not handled by these functions.
+ *
+ * Ramen Noodles are yummy.
+ * 
+ *  1998 Tymm Twillman <tymm@computer.org>  
+ */
+
+/*
+ * Registers that are used by the DMA controller; FN is the function register 
+ *   (tell the controller what to do) and EXE is the execution register (how
+ *   to do it)
+ */
+
+#define MCA_DMA_REG_FN  0x18
+#define MCA_DMA_REG_EXE 0x1A 
+
+/*
+ * Functions that the DMA controller can do
+ */
+
+#define MCA_DMA_FN_SET_IO       0x00
+#define MCA_DMA_FN_SET_ADDR     0x20
+#define MCA_DMA_FN_GET_ADDR     0x30
+#define MCA_DMA_FN_SET_COUNT    0x40
+#define MCA_DMA_FN_GET_COUNT    0x50
+#define MCA_DMA_FN_GET_STATUS   0x60
+#define MCA_DMA_FN_SET_MODE     0x70
+#define MCA_DMA_FN_SET_ARBUS    0x80
+#define MCA_DMA_FN_MASK         0x90
+#define MCA_DMA_FN_RESET_MASK   0xA0
+#define MCA_DMA_FN_MASTER_CLEAR 0xD0
+
+/*
+ * Modes (used by setting MCA_DMA_FN_MODE in the function register)
+ * 
+ * Note that the MODE_READ is read from memory (write to device), and
+ *   MODE_WRITE is vice-versa.  
+ */
+
+#define MCA_DMA_MODE_XFER  0x04  /* read by default */
+#define MCA_DMA_MODE_READ  0x04  /* same as XFER */
+#define MCA_DMA_MODE_WRITE 0x08  /* OR with MODE_XFER to use */
+#define MCA_DMA_MODE_IO    0x01  /* DMA from IO register */
+#define MCA_DMA_MODE_16    0x40  /* 16 bit xfers */
+
+
+
+static __inline__ void mca_enable_dma(unsigned int dmanr)
+{
+	outb(MCA_DMA_FN_RESET_MASK | dmanr, MCA_DMA_REG_FN);
+}
+
+static __inline__ void mca_disable_dma(unsigned int dmanr)
+{
+	outb(MCA_DMA_FN_MASK | dmanr, MCA_DMA_REG_FN);
+}
+
+static __inline__ void mca_set_dma_addr(unsigned int dmanr, unsigned int a)
+{
+	outb(MCA_DMA_FN_SET_ADDR | dmanr, MCA_DMA_REG_FN);
+	outb(a & 0xff, MCA_DMA_REG_EXE);
+	outb((a >> 8) & 0xff, MCA_DMA_REG_EXE);
+	outb((a >> 16) & 0xff, MCA_DMA_REG_EXE);
+}
+
+static __inline__ unsigned int mca_get_dma_addr(unsigned int dmanr)
+{
+	unsigned int addr;
+
+	outb(MCA_DMA_FN_GET_ADDR | dmanr, MCA_DMA_REG_FN);
+	addr = inb(MCA_DMA_REG_EXE);
+	addr |= inb(MCA_DMA_REG_EXE) << 8;
+	addr |= inb(MCA_DMA_REG_EXE) << 16;  
+
+	return addr;
+}
+
+static __inline__ void mca_set_dma_count(unsigned int dmanr, unsigned int count)
+{
+	count--;  /* transfers one more than count -- correct for this */
+
+	outb(MCA_DMA_FN_SET_COUNT | dmanr, MCA_DMA_REG_FN);
+	outb(count & 0xff, MCA_DMA_REG_EXE);
+	outb((count >> 8) & 0xff, MCA_DMA_REG_EXE);
+}
+
+static __inline__ unsigned int mca_get_dma_residue(unsigned int dmanr)
+{
+	unsigned short count;
+
+	outb(MCA_DMA_FN_GET_COUNT | dmanr, MCA_DMA_REG_FN);
+	count = 1 + inb(MCA_DMA_REG_EXE);
+	count += inb(MCA_DMA_REG_EXE) << 8;
+
+	return count;
+}
+
+static __inline__ void mca_set_dma_io(unsigned int dmanr, unsigned int io_addr)
+{
+	/*
+	 * DMA from a port address -- set the io address
+	 */
+	
+	outb(MCA_DMA_FN_SET_IO | dmanr, MCA_DMA_REG_FN);
+	outb(io_addr & 0xff, MCA_DMA_REG_EXE);
+	outb((io_addr >>  8) & 0xff, MCA_DMA_REG_EXE);
+}
+
+static __inline__ void mca_set_dma_mode(unsigned int dmanr, unsigned int mode)
+{
+	outb(MCA_DMA_FN_SET_MODE | dmanr, MCA_DMA_REG_FN);
+	outb(mode, MCA_DMA_REG_EXE);
+}
+
+#endif MCA_DMA_H