/* Architecture specific parts of the Floppy driver * * Linux/PA-RISC Project (http://www.parisc-linux.org/) * Copyright (C) 2000 Matthew Wilcox (willy a debian . org) * Copyright (C) 2000 Dave Kennedy * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef __ASM_PARISC_FLOPPY_H #define __ASM_PARISC_FLOPPY_H #include <linux/vmalloc.h> /* * The DMA channel used by the floppy controller cannot access data at * addresses >= 16MB * * Went back to the 1MB limit, as some people had problems with the floppy * driver otherwise. It doesn't matter much for performance anyway, as most * floppy accesses go through the track buffer. */ #define _CROSS_64KB(a,s,vdma) \ (!(vdma) && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64)) #define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1) #define SW fd_routine[use_virtual_dma&1] #define CSW fd_routine[can_use_virtual_dma & 1] #define fd_inb(port) readb(port) #define fd_outb(value, port) writeb(value, port) #define fd_request_dma() CSW._request_dma(FLOPPY_DMA,"floppy") #define fd_free_dma() CSW._free_dma(FLOPPY_DMA) #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) #define fd_get_dma_residue() SW._get_dma_residue(FLOPPY_DMA) #define fd_dma_mem_alloc(size) SW._dma_mem_alloc(size) #define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io) #define FLOPPY_CAN_FALLBACK_ON_NODMA static int virtual_dma_count=0; static int virtual_dma_residue=0; static char *virtual_dma_addr=0; static int virtual_dma_mode=0; static int doing_pdma=0; static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs) { register unsigned char st; #undef TRACE_FLPY_INT #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; } #ifdef TRACE_FLPY_INT if(!calls) bytes = virtual_dma_count; #endif { register int lcount; register char *lptr = virtual_dma_addr; for (lcount = virtual_dma_count; lcount; lcount--) { st = fd_inb(virtual_dma_port+4) & 0xa0 ; if (st != 0xa0) break; if (virtual_dma_mode) { fd_outb(*lptr, virtual_dma_port+5); } else { *lptr = fd_inb(virtual_dma_port+5); } lptr++; } virtual_dma_count = lcount; virtual_dma_addr = lptr; st = fd_inb(virtual_dma_port+4); } #ifdef TRACE_FLPY_INT calls++; #endif if (st == 0x20) return; 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, regs); return; } #ifdef TRACE_FLPY_INT if (!virtual_dma_count) dma_wait++; #endif } static void fd_disable_dma(void) { if(! (can_use_virtual_dma & 1)) disable_dma(FLOPPY_DMA); doing_pdma = 0; virtual_dma_residue += virtual_dma_count; virtual_dma_count=0; } static int vdma_request_dma(unsigned int dmanr, const char * device_id) { return 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, 0, "floppy", NULL); else return request_irq(FLOPPY_IRQ, floppy_interrupt, 0, "floppy", NULL); } static unsigned long dma_mem_alloc(unsigned long size) { return __get_dma_pages(GFP_KERNEL, get_order(size)); } static unsigned long vdma_mem_alloc(unsigned long size) { return (unsigned long) vmalloc(size); } #define nodma_mem_alloc(size) vdma_mem_alloc(size) static void _fd_dma_mem_free(unsigned long addr, unsigned long size) { if((unsigned int) addr >= (unsigned int) high_memory) return vfree((void *)addr); else free_pages(addr, get_order(size)); } #define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size) static void _fd_chose_dma_mode(char *addr, unsigned long size) { if(can_use_virtual_dma == 2) { if((unsigned int) addr >= (unsigned int) high_memory || virt_to_bus(addr) >= 0x1000000 || _CROSS_64KB(addr, size, 0)) use_virtual_dma = 1; else use_virtual_dma = 0; } else { use_virtual_dma = can_use_virtual_dma & 1; } } #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size) static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io) { doing_pdma = 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) { #ifdef FLOPPY_SANITY_CHECK if (CROSS_64KB(addr, size)) { printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size); return -1; } #endif /* actual, physical DMA */ doing_pdma = 0; clear_dma_ff(FLOPPY_DMA); set_dma_mode(FLOPPY_DMA,mode); set_dma_addr(FLOPPY_DMA,virt_to_bus(addr)); set_dma_count(FLOPPY_DMA,size); enable_dma(FLOPPY_DMA); return 0; } static struct fd_routine_l { int (*_request_dma)(unsigned int dmanr, const char * device_id); void (*_free_dma)(unsigned int dmanr); int (*_get_dma_residue)(unsigned int dummy); unsigned long (*_dma_mem_alloc) (unsigned long size); int (*_dma_setup)(char *addr, unsigned long size, int mode, int io); } fd_routine[] = { { request_dma, free_dma, get_dma_residue, dma_mem_alloc, hard_dma_setup }, { vdma_request_dma, vdma_nop, vdma_get_dma_residue, vdma_mem_alloc, vdma_dma_setup } }; static int FDC1 = 0x3f0; /* Lies. Floppy controller is memory mapped, not io mapped */ static int FDC2 = -1; #define FLOPPY0_TYPE 0 #define FLOPPY1_TYPE 0 #define N_FDC 1 #define N_DRIVE 8 #define EXTRA_FLOPPY_PARAMS #endif /* __ASM_PARISC_FLOPPY_H */