1/* 2 * linux/arch/arm26/kernel/dma.c 3 * 4 * Copyright (C) 1998-1999 Dave Gilbert / Russell King 5 * Copyright (C) 2003 Ian Molton 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * DMA functions specific to Archimedes and A5000 architecture 12 */ 13#include <linux/sched.h> 14#include <linux/init.h> 15 16#include <asm/dma.h> 17#include <asm/fiq.h> 18#include <asm/irq.h> 19#include <asm/io.h> 20#include <asm/hardware.h> 21#include <asm/mach-types.h> 22 23#define DPRINTK(x...) printk(KERN_DEBUG x) 24 25#if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE) 26 27extern unsigned char fdc1772_dma_read, fdc1772_dma_read_end; 28extern unsigned char fdc1772_dma_write, fdc1772_dma_write_end; 29extern void fdc1772_setupdma(unsigned int count,unsigned int addr); 30 31static void arc_floppy_data_enable_dma(dmach_t channel, dma_t *dma) 32{ 33 DPRINTK("arc_floppy_data_enable_dma\n"); 34 35 if (dma->using_sg) 36 BUG(); 37 38 switch (dma->dma_mode) { 39 case DMA_MODE_READ: { /* read */ 40 unsigned long flags; 41 DPRINTK("enable_dma fdc1772 data read\n"); 42 local_save_flags_cli(flags); 43 clf(); 44 45 memcpy ((void *)0x1c, (void *)&fdc1772_dma_read, 46 &fdc1772_dma_read_end - &fdc1772_dma_read); 47 fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */ 48 enable_fiq(FIQ_FLOPPYDATA); 49 local_irq_restore(flags); 50 } 51 break; 52 53 case DMA_MODE_WRITE: { /* write */ 54 unsigned long flags; 55 DPRINTK("enable_dma fdc1772 data write\n"); 56 local_save_flags_cli(flags); 57 clf(); 58 memcpy ((void *)0x1c, (void *)&fdc1772_dma_write, 59 &fdc1772_dma_write_end - &fdc1772_dma_write); 60 fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */ 61 enable_fiq(FIQ_FLOPPYDATA); 62 63 local_irq_restore(flags); 64 } 65 break; 66 default: 67 printk ("enable_dma: dma%d not initialised\n", channel); 68 } 69} 70 71static int arc_floppy_data_get_dma_residue(dmach_t channel, dma_t *dma) 72{ 73 extern unsigned int fdc1772_bytestogo; 74 75 /* 10/1/1999 DAG - I presume its the number of bytes left? */ 76 return fdc1772_bytestogo; 77} 78 79static void arc_floppy_cmdend_enable_dma(dmach_t channel, dma_t *dma) 80{ 81 /* Need to build a branch at the FIQ address */ 82 extern void fdc1772_comendhandler(void); 83 unsigned long flags; 84 85 DPRINTK("arc_floppy_cmdend_enable_dma\n"); 86 /*printk("enable_dma fdc1772 command end FIQ\n");*/ 87 save_flags(flags); 88 clf(); 89 90 /* B fdc1772_comendhandler */ 91 *((unsigned int *)0x1c)=0xea000000 | 92 (((unsigned int)fdc1772_comendhandler-(0x1c+8))/4); 93 94 local_irq_restore(flags); 95} 96 97static int arc_floppy_cmdend_get_dma_residue(dmach_t channel, dma_t *dma) 98{ 99 /* 10/1/1999 DAG - Presume whether there is an outstanding command? */ 100 extern unsigned int fdc1772_fdc_int_done; 101 102 /* Explicit! If the int done is 0 then 1 int to go */ 103 return (fdc1772_fdc_int_done==0)?1:0; 104} 105 106static void arc_disable_dma(dmach_t channel, dma_t *dma) 107{ 108 disable_fiq(dma->dma_irq); 109} 110 111static struct dma_ops arc_floppy_data_dma_ops = { 112 .type = "FIQDMA", 113 .enable = arc_floppy_data_enable_dma, 114 .disable = arc_disable_dma, 115 .residue = arc_floppy_data_get_dma_residue, 116}; 117 118static struct dma_ops arc_floppy_cmdend_dma_ops = { 119 .type = "FIQCMD", 120 .enable = arc_floppy_cmdend_enable_dma, 121 .disable = arc_disable_dma, 122 .residue = arc_floppy_cmdend_get_dma_residue, 123}; 124#endif 125 126#ifdef CONFIG_ARCH_A5K 127static struct fiq_handler fh = { 128 .name = "floppydata" 129}; 130 131static int a5k_floppy_get_dma_residue(dmach_t channel, dma_t *dma) 132{ 133 struct pt_regs regs; 134 get_fiq_regs(®s); 135 return regs.ARM_r9; 136} 137 138static void a5k_floppy_enable_dma(dmach_t channel, dma_t *dma) 139{ 140 struct pt_regs regs; 141 void *fiqhandler_start; 142 unsigned int fiqhandler_length; 143 extern void floppy_fiqsetup(unsigned long len, unsigned long addr, 144 unsigned long port); 145 146 if (dma->using_sg) 147 BUG(); 148 149 if (dma->dma_mode == DMA_MODE_READ) { 150 extern unsigned char floppy_fiqin_start, floppy_fiqin_end; 151 fiqhandler_start = &floppy_fiqin_start; 152 fiqhandler_length = &floppy_fiqin_end - &floppy_fiqin_start; 153 } else { 154 extern unsigned char floppy_fiqout_start, floppy_fiqout_end; 155 fiqhandler_start = &floppy_fiqout_start; 156 fiqhandler_length = &floppy_fiqout_end - &floppy_fiqout_start; 157 } 158 if (claim_fiq(&fh)) { 159 printk("floppydma: couldn't claim FIQ.\n"); 160 return; 161 } 162 memcpy((void *)0x1c, fiqhandler_start, fiqhandler_length); 163 regs.ARM_r9 = dma->buf.length; 164 regs.ARM_r10 = (unsigned long)dma->buf.__address; 165 regs.ARM_fp = FLOPPYDMA_BASE; 166 set_fiq_regs(®s); 167 enable_fiq(dma->dma_irq); 168} 169 170static void a5k_floppy_disable_dma(dmach_t channel, dma_t *dma) 171{ 172 disable_fiq(dma->dma_irq); 173 release_fiq(&fh); 174} 175 176static struct dma_ops a5k_floppy_dma_ops = { 177 .type = "FIQDMA", 178 .enable = a5k_floppy_enable_dma, 179 .disable = a5k_floppy_disable_dma, 180 .residue = a5k_floppy_get_dma_residue, 181}; 182#endif 183 184/* 185 * This is virtual DMA - we don't need anything here 186 */ 187static void sound_enable_disable_dma(dmach_t channel, dma_t *dma) 188{ 189} 190 191static struct dma_ops sound_dma_ops = { 192 .type = "VIRTUAL", 193 .enable = sound_enable_disable_dma, 194 .disable = sound_enable_disable_dma, 195}; 196 197void __init arch_dma_init(dma_t *dma) 198{ 199#if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE) 200 if (machine_is_archimedes()) { 201 dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA; 202 dma[DMA_VIRTUAL_FLOPPY0].d_ops = &arc_floppy_data_dma_ops; 203 dma[DMA_VIRTUAL_FLOPPY1].dma_irq = 1; 204 dma[DMA_VIRTUAL_FLOPPY1].d_ops = &arc_floppy_cmdend_dma_ops; 205 } 206#endif 207#ifdef CONFIG_ARCH_A5K 208 if (machine_is_a5k()) { 209 dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA; 210 dma[DMA_VIRTUAL_FLOPPY0].d_ops = &a5k_floppy_dma_ops; 211 } 212#endif 213 dma[DMA_VIRTUAL_SOUND].d_ops = &sound_dma_ops; 214} 215