2 * linux/arch/arm/kernel/dma-arc.c
4 * Copyright (C) 1998-1999 Dave Gilbert / Russell King
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * DMA functions specific to Archimedes and A5000 architecture
12 #include <linux/config.h>
13 #include <linux/sched.h>
14 #include <linux/init.h>
20 #include <asm/hardware.h>
21 #include <asm/mach-types.h>
23 #include <asm/mach/dma.h>
25 #define DPRINTK(x...) printk(KERN_DEBUG x)
27 #if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE)
28 static void arc_floppy_data_enable_dma(dmach_t channel, dma_t *dma)
30 DPRINTK("arc_floppy_data_enable_dma\n");
31 switch (dma->dma_mode) {
32 case DMA_MODE_READ: { /* read */
33 extern unsigned char fdc1772_dma_read, fdc1772_dma_read_end;
34 extern void fdc1772_setupdma(unsigned int count,unsigned int addr);
36 DPRINTK("enable_dma fdc1772 data read\n");
37 local_save_flags(flags);
40 memcpy ((void *)0x1c, (void *)&fdc1772_dma_read,
41 &fdc1772_dma_read_end - &fdc1772_dma_read);
42 fdc1772_setupdma(dma->buf.length, dma->buf.address); /* Sets data pointer up */
43 enable_fiq(FIQ_FLOPPYDATA);
44 local_irq_restore(flags);
48 case DMA_MODE_WRITE: { /* write */
49 extern unsigned char fdc1772_dma_write, fdc1772_dma_write_end;
50 extern void fdc1772_setupdma(unsigned int count,unsigned int addr);
52 DPRINTK("enable_dma fdc1772 data write\n");
53 local_save_flags(flags);
55 memcpy ((void *)0x1c, (void *)&fdc1772_dma_write,
56 &fdc1772_dma_write_end - &fdc1772_dma_write);
57 fdc1772_setupdma(dma->buf.length, dma->buf.address); /* Sets data pointer up */
58 enable_fiq(FIQ_FLOPPYDATA;
60 local_irq_restore(flags);
64 printk ("enable_dma: dma%d not initialised\n", channel);
68 static int arc_floppy_data_get_dma_residue(dmach_t channel, dma_t *dma)
70 extern unsigned int fdc1772_bytestogo;
72 /* 10/1/1999 DAG - I presume its the number of bytes left? */
73 return fdc1772_bytestogo;
76 static void arc_floppy_cmdend_enable_dma(dmach_t channel, dma_t *dma)
78 /* Need to build a branch at the FIQ address */
79 extern void fdc1772_comendhandler(void);
82 DPRINTK("arc_floppy_cmdend_enable_dma\n");
83 /*printk("enable_dma fdc1772 command end FIQ\n");*/
84 local_save_flags(flags);
87 /* B fdc1772_comendhandler */
88 *((unsigned int *)0x1c)=0xea000000 |
89 (((unsigned int)fdc1772_comendhandler-(0x1c+8))/4);
91 local_irq_restore(flags);
94 static int arc_floppy_cmdend_get_dma_residue(dmach_t channel, dma_t *dma)
96 /* 10/1/1999 DAG - Presume whether there is an outstanding command? */
97 extern unsigned int fdc1772_fdc_int_done;
99 /* Explicit! If the int done is 0 then 1 int to go */
100 return (fdc1772_fdc_int_done==0)?1:0;
103 static void arc_disable_dma(dmach_t channel, dma_t *dma)
105 disable_fiq(dma->dma_irq);
108 static struct dma_ops arc_floppy_data_dma_ops = {
110 .enable = arc_floppy_data_enable_dma,
111 .disable = arc_disable_dma,
112 .residue = arc_floppy_data_get_dma_residue,
115 static struct dma_ops arc_floppy_cmdend_dma_ops = {
117 .enable = arc_floppy_cmdend_enable_dma,
118 .disable = arc_disable_dma,
119 .residue = arc_floppy_cmdend_get_dma_residue,
123 #ifdef CONFIG_ARCH_A5K
124 static struct fiq_handler fh = {
125 .name = "floppydata",
128 static int a5k_floppy_get_dma_residue(dmach_t channel, dma_t *dma)
135 static void a5k_floppy_enable_dma(dmach_t channel, dma_t *dma)
138 void *fiqhandler_start;
139 unsigned int fiqhandler_length;
140 extern void floppy_fiqsetup(unsigned long len, unsigned long addr,
143 if (dma->dma_mode == DMA_MODE_READ) {
144 extern unsigned char floppy_fiqin_start, floppy_fiqin_end;
145 fiqhandler_start = &floppy_fiqin_start;
146 fiqhandler_length = &floppy_fiqin_end - &floppy_fiqin_start;
148 extern unsigned char floppy_fiqout_start, floppy_fiqout_end;
149 fiqhandler_start = &floppy_fiqout_start;
150 fiqhandler_length = &floppy_fiqout_end - &floppy_fiqout_start;
152 if (claim_fiq(&fh)) {
153 printk("floppydma: couldn't claim FIQ.\n");
156 memcpy((void *)0x1c, fiqhandler_start, fiqhandler_length);
157 regs.ARM_r9 = dma->buf.length;
158 regs.ARM_r10 = (unsigned long)dma->buf.address;
159 regs.ARM_fp = FLOPPYDMA_BASE;
161 enable_fiq(dma->dma_irq);
164 static void a5k_floppy_disable_dma(dmach_t channel, dma_t *dma)
166 disable_fiq(dma->dma_irq);
170 static struct dma_ops a5k_floppy_dma_ops = {
172 .enable = a5k_floppy_enable_dma,
173 .disable = a5k_floppy_disable_dma,
174 .residue = a5k_floppy_get_dma_residue,
179 * This is virtual DMA - we don't need anything here
181 static void sound_enable_disable_dma(dmach_t channel, dma_t *dma)
185 static struct dma_ops sound_dma_ops = {
187 .enable = sound_enable_disable_dma,
188 .disable = sound_enable_disable_dma,
191 void __init arch_dma_init(dma_t *dma)
193 #if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE)
194 if (machine_is_archimedes()) {
195 dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA;
196 dma[DMA_VIRTUAL_FLOPPY0].d_ops = &arc_floppy_data_dma_ops;
197 dma[DMA_VIRTUAL_FLOPPY1].dma_irq = 1;
198 dma[DMA_VIRTUAL_FLOPPY1].d_ops = &arc_floppy_cmdend_dma_ops;
201 #ifdef CONFIG_ARCH_A5K
202 if (machine_is_a5k()) {
203 dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA;
204 dma[DMA_VIRTUAL_FLOPPY0].d_ops = &a5k_floppy_dma_ops;
207 dma[DMA_VIRTUAL_SOUND].d_ops = &sound_dma_ops;