/arch/powerpc/include/asm/floppy.h
C Header | 213 lines | 160 code | 36 blank | 17 comment | 21 complexity | f6fff1797a99178a611e246fcde12f85 MD5 | raw file
- /*
- * Architecture specific parts of the Floppy driver
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 1995
- */
- #ifndef __ASM_POWERPC_FLOPPY_H
- #define __ASM_POWERPC_FLOPPY_H
- #ifdef __KERNEL__
- #include <asm/machdep.h>
- #define fd_inb(port) inb_p(port)
- #define fd_outb(value,port) outb_p(value,port)
- #define fd_enable_dma() enable_dma(FLOPPY_DMA)
- #define fd_disable_dma() fd_ops->_disable_dma(FLOPPY_DMA)
- #define fd_free_dma() fd_ops->_free_dma(FLOPPY_DMA)
- #define fd_clear_dma_ff() clear_dma_ff(FLOPPY_DMA)
- #define fd_set_dma_mode(mode) set_dma_mode(FLOPPY_DMA, mode)
- #define fd_set_dma_count(count) set_dma_count(FLOPPY_DMA, count)
- #define fd_get_dma_residue() fd_ops->_get_dma_residue(FLOPPY_DMA)
- #define fd_enable_irq() enable_irq(FLOPPY_IRQ)
- #define fd_disable_irq() disable_irq(FLOPPY_IRQ)
- #define fd_cacheflush(addr,size) /* nothing */
- #define fd_free_irq() free_irq(FLOPPY_IRQ, NULL);
- #include <linux/pci.h>
- #include <asm/ppc-pci.h> /* for isa_bridge_pcidev */
- #define fd_dma_setup(addr,size,mode,io) fd_ops->_dma_setup(addr,size,mode,io)
- static int fd_request_dma(void);
- struct fd_dma_ops {
- void (*_disable_dma)(unsigned int dmanr);
- void (*_free_dma)(unsigned int dmanr);
- int (*_get_dma_residue)(unsigned int dummy);
- int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
- };
- static int virtual_dma_count;
- static int virtual_dma_residue;
- static char *virtual_dma_addr;
- static int virtual_dma_mode;
- static int doing_vdma;
- static struct fd_dma_ops *fd_ops;
- static irqreturn_t floppy_hardint(int irq, void *dev_id)
- {
- unsigned char st;
- int lcount;
- char *lptr;
- if (!doing_vdma)
- return floppy_interrupt(irq, dev_id);
- st = 1;
- for (lcount=virtual_dma_count, lptr=virtual_dma_addr;
- lcount; lcount--, lptr++) {
- st=inb(virtual_dma_port+4) & 0xa0 ;
- if (st != 0xa0)
- break;
- if (virtual_dma_mode)
- outb_p(*lptr, virtual_dma_port+5);
- else
- *lptr = inb_p(virtual_dma_port+5);
- }
- virtual_dma_count = lcount;
- virtual_dma_addr = lptr;
- st = inb(virtual_dma_port+4);
- if (st == 0x20)
- return IRQ_HANDLED;
- if (!(st & 0x20)) {
- virtual_dma_residue += virtual_dma_count;
- virtual_dma_count=0;
- doing_vdma = 0;
- floppy_interrupt(irq, dev_id);
- return IRQ_HANDLED;
- }
- return IRQ_HANDLED;
- }
- static void vdma_disable_dma(unsigned int dummy)
- {
- doing_vdma = 0;
- virtual_dma_residue += virtual_dma_count;
- virtual_dma_count=0;
- }
- static void vdma_nop(unsigned int dummy)
- {
- }
- static int vdma_get_dma_residue(unsigned int dummy)
- {
- return virtual_dma_count + virtual_dma_residue;
- }
- static int fd_request_irq(void)
- {
- if (can_use_virtual_dma)
- return request_irq(FLOPPY_IRQ, floppy_hardint,
- 0, "floppy", NULL);
- else
- return request_irq(FLOPPY_IRQ, floppy_interrupt,
- 0, "floppy", NULL);
- }
- static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
- {
- doing_vdma = 1;
- virtual_dma_port = io;
- virtual_dma_mode = (mode == DMA_MODE_WRITE);
- virtual_dma_addr = addr;
- virtual_dma_count = size;
- virtual_dma_residue = 0;
- return 0;
- }
- static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
- {
- static unsigned long prev_size;
- static dma_addr_t bus_addr = 0;
- static char *prev_addr;
- static int prev_dir;
- int dir;
- doing_vdma = 0;
- dir = (mode == DMA_MODE_READ) ? PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE;
- if (bus_addr
- && (addr != prev_addr || size != prev_size || dir != prev_dir)) {
- /* different from last time -- unmap prev */
- pci_unmap_single(isa_bridge_pcidev, bus_addr, prev_size, prev_dir);
- bus_addr = 0;
- }
- if (!bus_addr) /* need to map it */
- bus_addr = pci_map_single(isa_bridge_pcidev, addr, size, dir);
- /* remember this one as prev */
- prev_addr = addr;
- prev_size = size;
- prev_dir = dir;
- fd_clear_dma_ff();
- fd_cacheflush(addr, size);
- fd_set_dma_mode(mode);
- set_dma_addr(FLOPPY_DMA, bus_addr);
- fd_set_dma_count(size);
- virtual_dma_port = io;
- fd_enable_dma();
- return 0;
- }
- static struct fd_dma_ops real_dma_ops =
- {
- ._disable_dma = disable_dma,
- ._free_dma = free_dma,
- ._get_dma_residue = get_dma_residue,
- ._dma_setup = hard_dma_setup
- };
- static struct fd_dma_ops virt_dma_ops =
- {
- ._disable_dma = vdma_disable_dma,
- ._free_dma = vdma_nop,
- ._get_dma_residue = vdma_get_dma_residue,
- ._dma_setup = vdma_dma_setup
- };
- static int fd_request_dma(void)
- {
- if (can_use_virtual_dma & 1) {
- fd_ops = &virt_dma_ops;
- return 0;
- }
- else {
- fd_ops = &real_dma_ops;
- return request_dma(FLOPPY_DMA, "floppy");
- }
- }
- static int FDC1 = 0x3f0;
- static int FDC2 = -1;
- /*
- * Again, the CMOS information not available
- */
- #define FLOPPY0_TYPE 6
- #define FLOPPY1_TYPE 0
- #define N_FDC 2 /* Don't change this! */
- #define N_DRIVE 8
- /*
- * The PowerPC has no problems with floppy DMA crossing 64k borders.
- */
- #define CROSS_64KB(a,s) (0)
- #define EXTRA_FLOPPY_PARAMS
- #endif /* __KERNEL__ */
- #endif /* __ASM_POWERPC_FLOPPY_H */