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Diffstat (limited to 'arch/alpha/include/asm/floppy.h')
| -rw-r--r-- | arch/alpha/include/asm/floppy.h | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/arch/alpha/include/asm/floppy.h b/arch/alpha/include/asm/floppy.h new file mode 100644 index 000000000..8dfdb3aa1 --- /dev/null +++ b/arch/alpha/include/asm/floppy.h @@ -0,0 +1,113 @@ +/* + * 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_ALPHA_FLOPPY_H +#define __ASM_ALPHA_FLOPPY_H + + +#define fd_inb(base, reg) inb_p((base) + (reg)) +#define fd_outb(value, base, reg) outb_p(value, (base) + (reg)) + +#define fd_enable_dma() enable_dma(FLOPPY_DMA) +#define fd_disable_dma() disable_dma(FLOPPY_DMA) +#define fd_request_dma() request_dma(FLOPPY_DMA,"floppy") +#define fd_free_dma() 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_addr(addr) set_dma_addr(FLOPPY_DMA,virt_to_bus(addr)) +#define fd_set_dma_count(count) set_dma_count(FLOPPY_DMA,count) +#define fd_enable_irq() enable_irq(FLOPPY_IRQ) +#define fd_disable_irq() disable_irq(FLOPPY_IRQ) +#define fd_request_irq() request_irq(FLOPPY_IRQ, floppy_interrupt,\ + 0, "floppy", NULL) +#define fd_free_irq() free_irq(FLOPPY_IRQ, NULL) + +#ifdef CONFIG_PCI + +#include <linux/pci.h> + +#define fd_dma_setup(addr,size,mode,io) alpha_fd_dma_setup(addr,size,mode,io) + +static __inline__ int +alpha_fd_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; + + 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, bus_addr, prev_size, prev_dir); + bus_addr = 0; + } + + if (!bus_addr) /* need to map it */ + bus_addr = pci_map_single(isa_bridge, addr, size, dir); + + /* remember this one as prev */ + prev_addr = addr; + prev_size = size; + prev_dir = dir; + + fd_clear_dma_ff(); + 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; +} + +#endif /* CONFIG_PCI */ + +__inline__ void virtual_dma_init(void) +{ + /* Nothing to do on an Alpha */ +} + +static int FDC1 = 0x3f0; +static int FDC2 = -1; + +/* + * Again, the CMOS information doesn't work on the alpha.. + */ +#define FLOPPY0_TYPE 6 +#define FLOPPY1_TYPE 0 + +#define N_FDC 2 +#define N_DRIVE 8 + +/* + * Most Alphas have no problems with floppy DMA crossing 64k borders, + * except for certain ones, like XL and RUFFIAN. + * + * However, the test is simple and fast, and this *is* floppy, after all, + * so we do it for all platforms, just to make sure. + * + * This is advantageous in other circumstances as well, as in moving + * about the PCI DMA windows and forcing the floppy to start doing + * scatter-gather when it never had before, and there *is* a problem + * on that platform... ;-} + */ + +static inline unsigned long CROSS_64KB(void *a, unsigned long s) +{ + unsigned long p = (unsigned long)a; + return ((p + s - 1) ^ p) & ~0xffffUL; +} + +#define EXTRA_FLOPPY_PARAMS + +#endif /* __ASM_ALPHA_FLOPPY_H */ |