summaryrefslogtreecommitdiffstats
path: root/include/asm-x86/mca_dma.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/asm-x86/mca_dma.h')
-rw-r--r--include/asm-x86/mca_dma.h201
1 files changed, 0 insertions, 201 deletions
diff --git a/include/asm-x86/mca_dma.h b/include/asm-x86/mca_dma.h
deleted file mode 100644
index 49f22be..0000000
--- a/include/asm-x86/mca_dma.h
+++ /dev/null
@@ -1,201 +0,0 @@
-#ifndef ASM_X86__MCA_DMA_H
-#define ASM_X86__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 */
-
-
-/**
- * mca_enable_dma - channel to enable DMA on
- * @dmanr: DMA channel
- *
- * Enable the MCA bus DMA on a channel. This can be called from
- * IRQ context.
- */
-
-static inline void mca_enable_dma(unsigned int dmanr)
-{
- outb(MCA_DMA_FN_RESET_MASK | dmanr, MCA_DMA_REG_FN);
-}
-
-/**
- * mca_disble_dma - channel to disable DMA on
- * @dmanr: DMA channel
- *
- * Enable the MCA bus DMA on a channel. This can be called from
- * IRQ context.
- */
-
-static inline void mca_disable_dma(unsigned int dmanr)
-{
- outb(MCA_DMA_FN_MASK | dmanr, MCA_DMA_REG_FN);
-}
-
-/**
- * mca_set_dma_addr - load a 24bit DMA address
- * @dmanr: DMA channel
- * @a: 24bit bus address
- *
- * Load the address register in the DMA controller. This has a 24bit
- * limitation (16Mb).
- */
-
-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);
-}
-
-/**
- * mca_get_dma_addr - load a 24bit DMA address
- * @dmanr: DMA channel
- *
- * Read the address register in the DMA controller. This has a 24bit
- * limitation (16Mb). The return is a bus address.
- */
-
-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;
-}
-
-/**
- * mca_set_dma_count - load a 16bit transfer count
- * @dmanr: DMA channel
- * @count: count
- *
- * Set the DMA count for this channel. This can be up to 64Kbytes.
- * Setting a count of zero will not do what you expect.
- */
-
-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);
-}
-
-/**
- * mca_get_dma_residue - get the remaining bytes to transfer
- * @dmanr: DMA channel
- *
- * This function returns the number of bytes left to transfer
- * on this DMA channel.
- */
-
-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;
-}
-
-/**
- * mca_set_dma_io - set the port for an I/O transfer
- * @dmanr: DMA channel
- * @io_addr: an I/O port number
- *
- * Unlike the ISA bus DMA controllers the DMA on MCA bus can transfer
- * with an I/O port target.
- */
-
-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);
-}
-
-/**
- * mca_set_dma_mode - set the DMA mode
- * @dmanr: DMA channel
- * @mode: mode to set
- *
- * The DMA controller supports several modes. The mode values you can
- * set are-
- *
- * %MCA_DMA_MODE_READ when reading from the DMA device.
- *
- * %MCA_DMA_MODE_WRITE to writing to the DMA device.
- *
- * %MCA_DMA_MODE_IO to do DMA to or from an I/O port.
- *
- * %MCA_DMA_MODE_16 to do 16bit transfers.
- */
-
-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 /* ASM_X86__MCA_DMA_H */
OpenPOWER on IntegriCloud