summaryrefslogtreecommitdiffstats
path: root/arch/arm26/machine/dma.c
blob: 4402a5a1b78fbe2d9efc8fb294f5915a8269c130 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
/*
 *  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/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(&regs);
	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(&regs);
	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;
}