183 строки
4.1 KiB
C
183 строки
4.1 KiB
C
/*
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* Architecture specific parts of the Floppy driver
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1995
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*/
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#ifdef __KERNEL__
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#ifndef __ASM_PPC_FLOPPY_H
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#define __ASM_PPC_FLOPPY_H
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#define fd_inb(port) inb_p(port)
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#define fd_outb(value,port) outb_p(value,port)
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#define fd_disable_dma() fd_ops->_disable_dma(FLOPPY_DMA)
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#define fd_free_dma() fd_ops->_free_dma(FLOPPY_DMA)
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#define fd_get_dma_residue() fd_ops->_get_dma_residue(FLOPPY_DMA)
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#define fd_dma_setup(addr, size, mode, io) fd_ops->_dma_setup(addr, size, mode, io)
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#define fd_enable_irq() enable_irq(FLOPPY_IRQ)
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#define fd_disable_irq() disable_irq(FLOPPY_IRQ)
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#define fd_free_irq() free_irq(FLOPPY_IRQ, NULL);
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static int fd_request_dma(void);
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struct fd_dma_ops {
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void (*_disable_dma)(unsigned int dmanr);
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void (*_free_dma)(unsigned int dmanr);
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int (*_get_dma_residue)(unsigned int dummy);
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int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
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};
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static int virtual_dma_count;
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static int virtual_dma_residue;
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static char *virtual_dma_addr;
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static int virtual_dma_mode;
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static int doing_vdma;
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static struct fd_dma_ops *fd_ops;
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static irqreturn_t floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
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{
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unsigned char st;
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int lcount;
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char *lptr;
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if (!doing_vdma)
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return floppy_interrupt(irq, dev_id, regs);
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st = 1;
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for (lcount=virtual_dma_count, lptr=virtual_dma_addr;
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lcount; lcount--, lptr++) {
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st=inb(virtual_dma_port+4) & 0xa0 ;
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if (st != 0xa0)
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break;
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if (virtual_dma_mode)
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outb_p(*lptr, virtual_dma_port+5);
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else
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*lptr = inb_p(virtual_dma_port+5);
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}
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virtual_dma_count = lcount;
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virtual_dma_addr = lptr;
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st = inb(virtual_dma_port+4);
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if (st == 0x20)
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return IRQ_HANDLED;
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if (!(st & 0x20)) {
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virtual_dma_residue += virtual_dma_count;
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virtual_dma_count=0;
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doing_vdma = 0;
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floppy_interrupt(irq, dev_id, regs);
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return IRQ_HANDLED;
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}
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return IRQ_HANDLED;
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}
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static void vdma_disable_dma(unsigned int dummy)
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{
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doing_vdma = 0;
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virtual_dma_residue += virtual_dma_count;
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virtual_dma_count=0;
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}
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static void vdma_nop(unsigned int dummy)
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{
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}
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static int vdma_get_dma_residue(unsigned int dummy)
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{
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return virtual_dma_count + virtual_dma_residue;
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}
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static int fd_request_irq(void)
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{
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if (can_use_virtual_dma)
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return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
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"floppy", NULL);
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else
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return request_irq(FLOPPY_IRQ, floppy_interrupt,
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SA_INTERRUPT|SA_SAMPLE_RANDOM,
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"floppy", NULL);
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}
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static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
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{
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doing_vdma = 1;
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virtual_dma_port = io;
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virtual_dma_mode = (mode == DMA_MODE_WRITE);
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virtual_dma_addr = addr;
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virtual_dma_count = size;
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virtual_dma_residue = 0;
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return 0;
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}
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static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
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{
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/* actual, physical DMA */
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doing_vdma = 0;
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clear_dma_ff(FLOPPY_DMA);
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set_dma_mode(FLOPPY_DMA,mode);
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set_dma_addr(FLOPPY_DMA,(unsigned int)virt_to_bus(addr));
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set_dma_count(FLOPPY_DMA,size);
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enable_dma(FLOPPY_DMA);
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return 0;
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}
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static struct fd_dma_ops real_dma_ops =
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{
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._disable_dma = disable_dma,
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._free_dma = free_dma,
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._get_dma_residue = get_dma_residue,
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._dma_setup = hard_dma_setup
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};
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static struct fd_dma_ops virt_dma_ops =
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{
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._disable_dma = vdma_disable_dma,
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._free_dma = vdma_nop,
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._get_dma_residue = vdma_get_dma_residue,
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._dma_setup = vdma_dma_setup
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};
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static int fd_request_dma()
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{
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if (can_use_virtual_dma & 1) {
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fd_ops = &virt_dma_ops;
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return 0;
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}
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else {
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fd_ops = &real_dma_ops;
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return request_dma(FLOPPY_DMA, "floppy");
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}
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}
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static int FDC1 = 0x3f0;
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static int FDC2 = -1;
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/*
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* Again, the CMOS information not available
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*/
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#define FLOPPY0_TYPE 6
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#define FLOPPY1_TYPE 0
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#define N_FDC 2 /* Don't change this! */
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#define N_DRIVE 8
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#define FLOPPY_MOTOR_MASK 0xf0
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/*
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* The PowerPC has no problems with floppy DMA crossing 64k borders.
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*/
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#define CROSS_64KB(a,s) (0)
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#endif /* __ASM_PPC_FLOPPY_H */
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#define EXTRA_FLOPPY_PARAMS
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#endif /* __KERNEL__ */
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