diff options
Diffstat (limited to 'arch/m68k/include/asm/floppy.h')
| -rw-r--r-- | arch/m68k/include/asm/floppy.h | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/floppy.h b/arch/m68k/include/asm/floppy.h new file mode 100644 index 0000000..697d503 --- /dev/null +++ b/arch/m68k/include/asm/floppy.h @@ -0,0 +1,254 @@ +/* + * Implementation independent bits of the Floppy driver. + * + * much of this file is derived from what was originally the Q40 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) 1999, 2000, 2001 + * + * Sun3x support added 2/4/2000 Sam Creasey (sammy@sammy.net) + * + */ + +#include <asm/io.h> + +#include <linux/vmalloc.h> + +asmlinkage irqreturn_t floppy_hardint(int irq, void *dev_id); + +/* constants... */ + +#undef MAX_DMA_ADDRESS +#define MAX_DMA_ADDRESS 0x00 /* nothing like that */ + + +/* + * Again, the CMOS information doesn't work on m68k.. + */ +#define FLOPPY0_TYPE (MACH_IS_Q40 ? 6 : 4) +#define FLOPPY1_TYPE 0 + +/* basically PC init + set use_virtual_dma */ +#define FDC1 m68k_floppy_init() + +#define N_FDC 1 +#define N_DRIVE 8 + + +/* vdma globals adapted from asm-i386/floppy.h */ + +static int virtual_dma_count=0; +static int virtual_dma_residue=0; +static char *virtual_dma_addr=NULL; +static int virtual_dma_mode=0; +static int doing_pdma=0; + +#include <asm/sun3xflop.h> + +extern spinlock_t dma_spin_lock; + +static __inline__ unsigned long claim_dma_lock(void) +{ + unsigned long flags; + spin_lock_irqsave(&dma_spin_lock, flags); + return flags; +} + +static __inline__ void release_dma_lock(unsigned long flags) +{ + spin_unlock_irqrestore(&dma_spin_lock, flags); +} + + +static __inline__ unsigned char fd_inb(int port) +{ + if(MACH_IS_Q40) + return inb_p(port); + else if(MACH_IS_SUN3X) + return sun3x_82072_fd_inb(port); + return 0; +} + +static __inline__ void fd_outb(unsigned char value, int port) +{ + if(MACH_IS_Q40) + outb_p(value, port); + else if(MACH_IS_SUN3X) + sun3x_82072_fd_outb(value, port); +} + + +static int fd_request_irq(void) +{ + if(MACH_IS_Q40) + return request_irq(FLOPPY_IRQ, floppy_hardint, + IRQF_DISABLED, "floppy", floppy_hardint); + else if(MACH_IS_SUN3X) + return sun3xflop_request_irq(); + return -ENXIO; +} + +static void fd_free_irq(void) +{ + if(MACH_IS_Q40) + free_irq(FLOPPY_IRQ, floppy_hardint); +} + +#define fd_request_dma() vdma_request_dma(FLOPPY_DMA,"floppy") +#define fd_get_dma_residue() vdma_get_dma_residue(FLOPPY_DMA) +#define fd_dma_mem_alloc(size) vdma_mem_alloc(size) +#define fd_dma_setup(addr, size, mode, io) vdma_dma_setup(addr, size, mode, io) + +#define fd_enable_irq() /* nothing... */ +#define fd_disable_irq() /* nothing... */ + +#define fd_free_dma() /* nothing */ + +/* No 64k boundary crossing problems on Q40 - no DMA at all */ +#define CROSS_64KB(a,s) (0) + +#define DMA_MODE_READ 0x44 /* i386 look-alike */ +#define DMA_MODE_WRITE 0x48 + + +static int m68k_floppy_init(void) +{ + use_virtual_dma =1; + can_use_virtual_dma = 1; + + + if (MACH_IS_Q40) + return 0x3f0; + else if(MACH_IS_SUN3X) + return sun3xflop_init(); + else + return -1; +} + + +static int vdma_request_dma(unsigned int dmanr, const char * device_id) +{ + return 0; +} + + +static int vdma_get_dma_residue(unsigned int dummy) +{ + return virtual_dma_count + virtual_dma_residue; +} + + +static unsigned long vdma_mem_alloc(unsigned long size) +{ + return (unsigned long) vmalloc(size); + +} + +static void _fd_dma_mem_free(unsigned long addr, unsigned long size) +{ + vfree((void *)addr); +} +#define fd_dma_mem_free(addr,size) _fd_dma_mem_free(addr, size) + + +/* choose_dma_mode ???*/ + +static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io) +{ + doing_pdma = 1; + virtual_dma_port = (MACH_IS_Q40 ? io : 0); + virtual_dma_mode = (mode == DMA_MODE_WRITE); + virtual_dma_addr = addr; + virtual_dma_count = size; + virtual_dma_residue = 0; + return 0; +} + + + +static void fd_disable_dma(void) +{ + doing_pdma = 0; + virtual_dma_residue += virtual_dma_count; + virtual_dma_count=0; +} + + + +/* this is the only truly Q40 specific function */ + +asmlinkage irqreturn_t floppy_hardint(int irq, void *dev_id) +{ + 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); + return IRQ_HANDLED; + } + +#ifdef TRACE_FLPY_INT + if(!calls) + bytes = virtual_dma_count; +#endif + + { + register int lcount; + register char *lptr; + + /* serve 1st byte fast: */ + + 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); + } + +#ifdef TRACE_FLPY_INT + calls++; +#endif + if(st == 0x20) + return IRQ_HANDLED; + if(!(st & 0x20)) { + virtual_dma_residue += virtual_dma_count; + virtual_dma_count=0; +#ifdef TRACE_FLPY_INT + printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n", + virtual_dma_count, virtual_dma_residue, calls, bytes, + dma_wait); + calls = 0; + dma_wait=0; +#endif + doing_pdma = 0; + floppy_interrupt(irq, dev_id); + return IRQ_HANDLED; + } +#ifdef TRACE_FLPY_INT + if(!virtual_dma_count) + dma_wait++; +#endif + return IRQ_HANDLED; +} + +#define EXTRA_FLOPPY_PARAMS |