sun3xflop.h
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上传日期:2013-02-24
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- /* sun3xflop.h: Sun3/80 specific parts of the floppy driver.
- *
- * Derived partially from asm-sparc/floppy.h, which is:
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- *
- * Sun3x version 2/4/2000 Sam Creasey (sammy@oh.verio.com)
- */
- #ifndef __ASM_SUN3X_FLOPPY_H
- #define __ASM_SUN3X_FLOPPY_H
- #include <asm/page.h>
- #include <asm/pgtable.h>
- #include <asm/system.h>
- #include <asm/irq.h>
- #include <asm/sun3x.h>
- /* default interrupt vector */
- #define SUN3X_FDC_IRQ 0x40
- /* some constants */
- #define FCR_TC 0x1
- #define FCR_EJECT 0x2
- #define FCR_MTRON 0x4
- #define FCR_DSEL1 0x8
- #define FCR_DSEL0 0x10
- /* We don't need no stinkin' I/O port allocation crap. */
- #undef release_region
- #undef check_region
- #undef request_region
- #define release_region(X, Y) do { } while(0)
- #define check_region(X, Y) (0)
- #define request_region(X, Y, Z) (1)
- struct sun3xflop_private {
- volatile unsigned char *status_r;
- volatile unsigned char *data_r;
- volatile unsigned char *fcr_r;
- volatile unsigned char *fvr_r;
- unsigned char fcr;
- } sun3x_fdc;
- /* Super paranoid... */
- #undef HAVE_DISABLE_HLT
- /* Routines unique to each controller type on a Sun. */
- static unsigned char sun3x_82072_fd_inb(int port)
- {
- static int once = 0;
- // udelay(5);
- switch(port & 7) {
- default:
- printk("floppy: Asked to read unknown port %dn", port);
- panic("floppy: Port bolixed.");
- case 4: /* FD_STATUS */
- return (*sun3x_fdc.status_r) & ~STATUS_DMA;
- case 5: /* FD_DATA */
- return (*sun3x_fdc.data_r);
- case 7: /* FD_DIR */
- /* ugly hack, I can't find a way to actually detect the disk */
- if(!once) {
- once = 1;
- return 0x80;
- }
- return 0;
- };
- panic("sun_82072_fd_inb: How did I get here?");
- }
- static void sun3x_82072_fd_outb(unsigned char value, int port)
- {
- // udelay(5);
- switch(port & 7) {
- default:
- printk("floppy: Asked to write to unknown port %dn", port);
- panic("floppy: Port bolixed.");
- case 2: /* FD_DOR */
- /* Oh geese, 82072 on the Sun has no DOR register,
- * so we make do with taunting the FCR.
- *
- * ASSUMPTIONS: There will only ever be one floppy
- * drive attached to a Sun controller
- * and it will be at drive zero.
- */
- {
- unsigned char fcr = sun3x_fdc.fcr;
- if(value & 0x10) {
- fcr |= (FCR_DSEL0 | FCR_MTRON);
- } else
- fcr &= ~(FCR_DSEL0 | FCR_MTRON);
-
-
- if(fcr != sun3x_fdc.fcr) {
- *(sun3x_fdc.fcr_r) = fcr;
- sun3x_fdc.fcr = fcr;
- }
- }
- break;
- case 5: /* FD_DATA */
- *(sun3x_fdc.data_r) = value;
- break;
- case 7: /* FD_DCR */
- *(sun3x_fdc.status_r) = value;
- break;
- case 4: /* FD_STATUS */
- *(sun3x_fdc.status_r) = value;
- break;
- };
- return;
- }
- asmlinkage void sun3xflop_hardint(int irq, void *dev_id, struct pt_regs * regs)
- {
- register unsigned char st;
- #undef TRACE_FLPY_INT
- #define NO_FLOPPY_ASSEMBLER
- #ifdef TRACE_FLPY_INT
- static int calls=0;
- static int bytes=0;
- static int dma_wait=0;
- #endif
- if(!doing_pdma) {
- floppy_interrupt(irq, dev_id, regs);
- return;
- }
- // printk("doing pdman");// st %xn", sun_fdc->status_82072);
- #ifdef TRACE_FLPY_INT
- if(!calls)
- bytes = virtual_dma_count;
- #endif
- {
- register int lcount;
- register char *lptr;
- for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
- lcount; lcount--, lptr++) {
- /* st=fd_inb(virtual_dma_port+4) & 0x80 ; */
- st = *(sun3x_fdc.status_r);
- /* if(st != 0xa0) */
- /* break; */
-
- if((st & 0x80) == 0) {
- virtual_dma_count = lcount;
- virtual_dma_addr = lptr;
- return;
- }
- if((st & 0x20) == 0)
- break;
-
- if(virtual_dma_mode)
- /* fd_outb(*lptr, virtual_dma_port+5); */
- *(sun3x_fdc.data_r) = *lptr;
- else
- /* *lptr = fd_inb(virtual_dma_port+5); */
- *lptr = *(sun3x_fdc.data_r);
- }
-
- virtual_dma_count = lcount;
- virtual_dma_addr = lptr;
- /* st = fd_inb(virtual_dma_port+4); */
- st = *(sun3x_fdc.status_r);
- }
- #ifdef TRACE_FLPY_INT
- calls++;
- #endif
- // printk("st=%02xn", st);
- if(st == 0x20)
- return;
- if(!(st & 0x20)) {
- virtual_dma_residue += virtual_dma_count;
- virtual_dma_count=0;
- doing_pdma = 0;
- #ifdef TRACE_FLPY_INT
- printk("count=%x, residue=%x calls=%d bytes=%x dma_wait=%dn",
- virtual_dma_count, virtual_dma_residue, calls, bytes,
- dma_wait);
- calls = 0;
- dma_wait=0;
- #endif
- floppy_interrupt(irq, dev_id, regs);
- return;
- }
-
- #ifdef TRACE_FLPY_INT
- if(!virtual_dma_count)
- dma_wait++;
- #endif
- }
- static int sun3xflop_request_irq(void)
- {
- static int once = 0;
- int error;
- if(!once) {
- once = 1;
- error = request_irq(FLOPPY_IRQ, sun3xflop_hardint, SA_INTERRUPT, "floppy", 0);
- return ((error == 0) ? 0 : -1);
- } else return 0;
- }
- static void __init floppy_set_flags(int *ints,int param, int param2);
- static int sun3xflop_init(void)
- {
- if(FLOPPY_IRQ < 0x40)
- FLOPPY_IRQ = SUN3X_FDC_IRQ;
- sun3x_fdc.status_r = (volatile unsigned char *)SUN3X_FDC;
- sun3x_fdc.data_r = (volatile unsigned char *)(SUN3X_FDC+1);
- sun3x_fdc.fcr_r = (volatile unsigned char *)SUN3X_FDC_FCR;
- sun3x_fdc.fvr_r = (volatile unsigned char *)SUN3X_FDC_FVR;
- sun3x_fdc.fcr = 0;
- /* Last minute sanity check... */
- if(*sun3x_fdc.status_r == 0xff) {
- return -1;
- }
-
- *sun3x_fdc.fvr_r = FLOPPY_IRQ;
-
- *sun3x_fdc.fcr_r = FCR_TC;
- udelay(10);
- *sun3x_fdc.fcr_r = 0;
- /* Success... */
- floppy_set_flags(0, 1, FD_BROKEN_DCL); // I don't know how to detect this.
- allowed_drive_mask = 0x01;
- return (int) SUN3X_FDC;
- }
- /* I'm not precisely sure this eject routine works */
- static int sun3x_eject(void)
- {
- if(MACH_IS_SUN3X) {
-
- sun3x_fdc.fcr |= (FCR_DSEL0 | FCR_EJECT);
- *(sun3x_fdc.fcr_r) = sun3x_fdc.fcr;
- udelay(10);
- sun3x_fdc.fcr &= ~(FCR_DSEL0 | FCR_EJECT);
- *(sun3x_fdc.fcr_r) = sun3x_fdc.fcr;
- }
- return 0;
- }
- #define fd_eject(drive) sun3x_eject()
- #endif /* !(__ASM_SUN3X_FLOPPY_H) */