/* * linux/arch/arm26/kernel/dma.c * * Copyright (C) 1998-1999 Dave Gilbert / Russell King * Copyright (C) 2003 Ian Molton * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * DMA functions specific to Archimedes and A5000 architecture */ #include <linux/config.h> #include <linux/sched.h> #include <linux/init.h> #include <asm/dma.h> #include <asm/fiq.h> #include <asm/irq.h> #include <asm/io.h> #include <asm/hardware.h> #include <asm/mach-types.h> #define DPRINTK(x...) printk(KERN_DEBUG x) #if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE) extern unsigned char fdc1772_dma_read, fdc1772_dma_read_end; extern unsigned char fdc1772_dma_write, fdc1772_dma_write_end; extern void fdc1772_setupdma(unsigned int count,unsigned int addr); static void arc_floppy_data_enable_dma(dmach_t channel, dma_t *dma) { DPRINTK("arc_floppy_data_enable_dma\n"); if (dma->using_sg) BUG(); switch (dma->dma_mode) { case DMA_MODE_READ: { /* read */ unsigned long flags; DPRINTK("enable_dma fdc1772 data read\n"); local_save_flags_cli(flags); clf(); memcpy ((void *)0x1c, (void *)&fdc1772_dma_read, &fdc1772_dma_read_end - &fdc1772_dma_read); fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */ enable_fiq(FIQ_FLOPPYDATA); local_irq_restore(flags); } break; case DMA_MODE_WRITE: { /* write */ unsigned long flags; DPRINTK("enable_dma fdc1772 data write\n"); local_save_flags_cli(flags); clf(); memcpy ((void *)0x1c, (void *)&fdc1772_dma_write, &fdc1772_dma_write_end - &fdc1772_dma_write); fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */ enable_fiq(FIQ_FLOPPYDATA); local_irq_restore(flags); } break; default: printk ("enable_dma: dma%d not initialised\n", channel); } } static int arc_floppy_data_get_dma_residue(dmach_t channel, dma_t *dma) { extern unsigned int fdc1772_bytestogo; /* 10/1/1999 DAG - I presume its the number of bytes left? */ return fdc1772_bytestogo; } static void arc_floppy_cmdend_enable_dma(dmach_t channel, dma_t *dma) { /* Need to build a branch at the FIQ address */ extern void fdc1772_comendhandler(void); unsigned long flags; DPRINTK("arc_floppy_cmdend_enable_dma\n"); /*printk("enable_dma fdc1772 command end FIQ\n");*/ save_flags(flags); clf(); /* B fdc1772_comendhandler */ *((unsigned int *)0x1c)=0xea000000 | (((unsigned int)fdc1772_comendhandler-(0x1c+8))/4); local_irq_restore(flags); } static int arc_floppy_cmdend_get_dma_residue(dmach_t channel, dma_t *dma) { /* 10/1/1999 DAG - Presume whether there is an outstanding command? */ extern unsigned int fdc1772_fdc_int_done; /* Explicit! If the int done is 0 then 1 int to go */ return (fdc1772_fdc_int_done==0)?1:0; } static void arc_disable_dma(dmach_t channel, dma_t *dma) { disable_fiq(dma->dma_irq); } static struct dma_ops arc_floppy_data_dma_ops = { .type = "FIQDMA", .enable = arc_floppy_data_enable_dma, .disable = arc_disable_dma, .residue = arc_floppy_data_get_dma_residue, }; static struct dma_ops arc_floppy_cmdend_dma_ops = { .type = "FIQCMD", .enable = arc_floppy_cmdend_enable_dma, .disable = arc_disable_dma, .residue = arc_floppy_cmdend_get_dma_residue, }; #endif #ifdef CONFIG_ARCH_A5K static struct fiq_handler fh = { .name = "floppydata" }; static int a5k_floppy_get_dma_residue(dmach_t channel, dma_t *dma) { struct pt_regs regs; get_fiq_regs(®s); return regs.ARM_r9; } static void a5k_floppy_enable_dma(dmach_t channel, dma_t *dma) { struct pt_regs regs; void *fiqhandler_start; unsigned int fiqhandler_length; extern void floppy_fiqsetup(unsigned long len, unsigned long addr, unsigned long port); if (dma->using_sg) BUG(); if (dma->dma_mode == DMA_MODE_READ) { extern unsigned char floppy_fiqin_start, floppy_fiqin_end; fiqhandler_start = &floppy_fiqin_start; fiqhandler_length = &floppy_fiqin_end - &floppy_fiqin_start; } else { extern unsigned char floppy_fiqout_start, floppy_fiqout_end; fiqhandler_start = &floppy_fiqout_start; fiqhandler_length = &floppy_fiqout_end - &floppy_fiqout_start; } if (claim_fiq(&fh)) { printk("floppydma: couldn't claim FIQ.\n"); return; } memcpy((void *)0x1c, fiqhandler_start, fiqhandler_length); regs.ARM_r9 = dma->buf.length; regs.ARM_r10 = (unsigned long)dma->buf.__address; regs.ARM_fp = FLOPPYDMA_BASE; set_fiq_regs(®s); enable_fiq(dma->dma_irq); } static void a5k_floppy_disable_dma(dmach_t channel, dma_t *dma) { disable_fiq(dma->dma_irq); release_fiq(&fh); } static struct dma_ops a5k_floppy_dma_ops = { .type = "FIQDMA", .enable = a5k_floppy_enable_dma, .disable = a5k_floppy_disable_dma, .residue = a5k_floppy_get_dma_residue, }; #endif /* * This is virtual DMA - we don't need anything here */ static void sound_enable_disable_dma(dmach_t channel, dma_t *dma) { } static struct dma_ops sound_dma_ops = { .type = "VIRTUAL", .enable = sound_enable_disable_dma, .disable = sound_enable_disable_dma, }; void __init arch_dma_init(dma_t *dma) { #if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE) if (machine_is_archimedes()) { dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA; dma[DMA_VIRTUAL_FLOPPY0].d_ops = &arc_floppy_data_dma_ops; dma[DMA_VIRTUAL_FLOPPY1].dma_irq = 1; dma[DMA_VIRTUAL_FLOPPY1].d_ops = &arc_floppy_cmdend_dma_ops; } #endif #ifdef CONFIG_ARCH_A5K if (machine_is_a5k()) { dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA; dma[DMA_VIRTUAL_FLOPPY0].d_ops = &a5k_floppy_dma_ops; } #endif dma[DMA_VIRTUAL_SOUND].d_ops = &sound_dma_ops; }