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1da177e4 LT |
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 | */ | |
1da177e4 LT |
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 | ||
27 | extern unsigned char fdc1772_dma_read, fdc1772_dma_read_end; | |
28 | extern unsigned char fdc1772_dma_write, fdc1772_dma_write_end; | |
29 | extern void fdc1772_setupdma(unsigned int count,unsigned int addr); | |
30 | ||
31 | static 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 | ||
71 | static 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 | ||
79 | static 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 | ||
97 | static 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 | ||
106 | static void arc_disable_dma(dmach_t channel, dma_t *dma) | |
107 | { | |
108 | disable_fiq(dma->dma_irq); | |
109 | } | |
110 | ||
111 | static 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 | ||
118 | static 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 | |
127 | static struct fiq_handler fh = { | |
128 | .name = "floppydata" | |
129 | }; | |
130 | ||
131 | static 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 | ||
138 | static 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 | ||
170 | static void a5k_floppy_disable_dma(dmach_t channel, dma_t *dma) | |
171 | { | |
172 | disable_fiq(dma->dma_irq); | |
173 | release_fiq(&fh); | |
174 | } | |
175 | ||
176 | static 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 | */ | |
187 | static void sound_enable_disable_dma(dmach_t channel, dma_t *dma) | |
188 | { | |
189 | } | |
190 | ||
191 | static struct dma_ops sound_dma_ops = { | |
192 | .type = "VIRTUAL", | |
193 | .enable = sound_enable_disable_dma, | |
194 | .disable = sound_enable_disable_dma, | |
195 | }; | |
196 | ||
197 | void __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 | } |