diff options
Diffstat (limited to 'include/asm-ppc/floppy.h')
| -rw-r--r-- | include/asm-ppc/floppy.h | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/include/asm-ppc/floppy.h b/include/asm-ppc/floppy.h new file mode 100644 index 000000000000..8ccd4a276fe9 --- /dev/null +++ b/include/asm-ppc/floppy.h @@ -0,0 +1,182 @@ +/* + * 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 + */ +#ifdef __KERNEL__ +#ifndef __ASM_PPC_FLOPPY_H +#define __ASM_PPC_FLOPPY_H + +#define fd_inb(port) inb_p(port) +#define fd_outb(value,port) outb_p(value,port) + +#define fd_disable_dma() fd_ops->_disable_dma(FLOPPY_DMA) +#define fd_free_dma() fd_ops->_free_dma(FLOPPY_DMA) +#define fd_get_dma_residue() fd_ops->_get_dma_residue(FLOPPY_DMA) +#define fd_dma_setup(addr, size, mode, io) fd_ops->_dma_setup(addr, size, mode, io) +#define fd_enable_irq() enable_irq(FLOPPY_IRQ) +#define fd_disable_irq() disable_irq(FLOPPY_IRQ) +#define fd_free_irq() free_irq(FLOPPY_IRQ, NULL); + +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, struct pt_regs * regs) +{ + unsigned char st; + int lcount; + char *lptr; + + if (!doing_vdma) + return floppy_interrupt(irq, dev_id, regs); + + + 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, regs); + 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,SA_INTERRUPT, + "floppy", NULL); + else + return request_irq(FLOPPY_IRQ, floppy_interrupt, + SA_INTERRUPT|SA_SAMPLE_RANDOM, + "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) +{ + /* actual, physical DMA */ + doing_vdma = 0; + clear_dma_ff(FLOPPY_DMA); + set_dma_mode(FLOPPY_DMA,mode); + set_dma_addr(FLOPPY_DMA,(unsigned int)virt_to_bus(addr)); + set_dma_count(FLOPPY_DMA,size); + enable_dma(FLOPPY_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() +{ + 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 + +#define FLOPPY_MOTOR_MASK 0xf0 + +/* + * The PowerPC has no problems with floppy DMA crossing 64k borders. + */ +#define CROSS_64KB(a,s) (0) + +#endif /* __ASM_PPC_FLOPPY_H */ + +#define EXTRA_FLOPPY_PARAMS + +#endif /* __KERNEL__ */ |