iCE40/yosys - clone of https://github.com/YosysHQ/yosys

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Diffstat (limited to 'examples/intel/asicworld_lfsr')

0 files changed, 0 insertions, 0 deletions

/* * 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 * * Modifications for Xen are Copyright (c) 2004, Keir Fraser. */ #ifndef __ASM_XEN_X86_64_FLOPPY_H #define __ASM_XEN_X86_64_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)) #include <linux/vmalloc.h> /* XEN: Hit DMA paths on the head. This trick from asm-m68k/floppy.h. */ #include <asm/dma.h> #undef MAX_DMA_ADDRESS #define MAX_DMA_ADDRESS 0 #define CROSS_64KB(a,s) (0) #define fd_inb(port) inb_p(port) #define fd_outb(value,port) outb_p(value,port) #define fd_request_dma() (0) #define fd_free_dma() ((void)0) #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() vdma_get_dma_residue(FLOPPY_DMA) #define fd_dma_mem_alloc(size) vdma_mem_alloc(size) #define fd_dma_mem_free(addr, size) vdma_mem_free(addr, size) #define fd_dma_setup(addr, size, mode, io) vdma_dma_setup(addr, size, mode, io) static int virtual_dma_count; static int virtual_dma_residue; static char *virtual_dma_addr; static int virtual_dma_mode; static int doing_pdma; static irqreturn_t 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) return floppy_interrupt(irq, dev_id, regs); #ifdef TRACE_FLPY_INT if(!calls) bytes = virtual_dma_count; #endif { register int lcount; register char *lptr; 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, regs); return IRQ_HANDLED; } #ifdef TRACE_FLPY_INT if(!virtual_dma_count) dma_wait++; #endif return IRQ_HANDLED; } static void fd_disable_dma(void) { doing_pdma = 0; virtual_dma_residue += virtual_dma_count; virtual_dma_count=0; } static int vdma_get_dma_residue(unsigned int dummy) { return virtual_dma_count + virtual_dma_residue; } static int fd_request_irq(void) { return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT, "floppy", NULL); } static unsigned long vdma_mem_alloc(unsigned long size) { return (unsigned long) vmalloc(size); } static void vdma_mem_free(unsigned long addr, unsigned long size) { vfree((void *)addr); } 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; } /* XEN: This trick to force 'virtual DMA' is from include/asm-m68k/floppy.h. */ #define FDC1 xen_floppy_init() static int FDC2 = -1; static int xen_floppy_init(void) { use_virtual_dma = 1; can_use_virtual_dma = 1; return 0x340; } /* * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock * is needed to prevent corrupted CMOS RAM in case "insmod floppy" * coincides with another rtc CMOS user. Paul G. */ #define FLOPPY0_TYPE ({ \ unsigned long flags; \ unsigned char val; \ spin_lock_irqsave(&rtc_lock, flags); \ val = (CMOS_READ(0x10) >> 4) & 15; \ spin_unlock_irqrestore(&rtc_lock, flags); \ val; \ }) #define FLOPPY1_TYPE ({ \ unsigned long flags; \ unsigned char val; \ spin_lock_irqsave(&rtc_lock, flags); \ val = CMOS_READ(0x10) & 15; \ spin_unlock_irqrestore(&rtc_lock, flags); \ val; \ }) #define N_FDC 2 #define N_DRIVE 8 #define FLOPPY_MOTOR_MASK 0xf0 #define EXTRA_FLOPPY_PARAMS #endif /* __ASM_XEN_X86_64_FLOPPY_H */


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