[ALSA] Add ARM PXA2xx AC97 driver
[linux-2.6.git] / arch / arm26 / machine / dma.c
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/config.h>
14 #include <linux/sched.h>
15 #include <linux/init.h>
16
17 #include <asm/dma.h>
18 #include <asm/fiq.h>
19 #include <asm/irq.h>
20 #include <asm/io.h>
21 #include <asm/hardware.h>
22 #include <asm/mach-types.h>
23
24 #define DPRINTK(x...) printk(KERN_DEBUG x)
25
26 #if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE)
27
28 extern unsigned char fdc1772_dma_read, fdc1772_dma_read_end;
29 extern unsigned char fdc1772_dma_write, fdc1772_dma_write_end;
30 extern void fdc1772_setupdma(unsigned int count,unsigned int addr);
31
32 static void arc_floppy_data_enable_dma(dmach_t channel, dma_t *dma)
33 {
34         DPRINTK("arc_floppy_data_enable_dma\n");
35
36         if (dma->using_sg)
37                 BUG();
38
39         switch (dma->dma_mode) {
40         case DMA_MODE_READ: { /* read */
41                 unsigned long flags;
42                 DPRINTK("enable_dma fdc1772 data read\n");
43                 local_save_flags_cli(flags);
44                 clf();
45                         
46                 memcpy ((void *)0x1c, (void *)&fdc1772_dma_read,
47                         &fdc1772_dma_read_end - &fdc1772_dma_read);
48                 fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */
49                 enable_fiq(FIQ_FLOPPYDATA);
50                 local_irq_restore(flags);
51            }
52            break;
53
54         case DMA_MODE_WRITE: { /* write */
55                 unsigned long flags;
56                 DPRINTK("enable_dma fdc1772 data write\n");
57                 local_save_flags_cli(flags);
58                 clf();
59                 memcpy ((void *)0x1c, (void *)&fdc1772_dma_write,
60                         &fdc1772_dma_write_end - &fdc1772_dma_write);
61                 fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */
62                 enable_fiq(FIQ_FLOPPYDATA);
63
64                 local_irq_restore(flags);
65             }
66             break;
67         default:
68                 printk ("enable_dma: dma%d not initialised\n", channel);
69         }
70 }
71
72 static int arc_floppy_data_get_dma_residue(dmach_t channel, dma_t *dma)
73 {
74         extern unsigned int fdc1772_bytestogo;
75
76         /* 10/1/1999 DAG - I presume its the number of bytes left? */
77         return fdc1772_bytestogo;
78 }
79
80 static void arc_floppy_cmdend_enable_dma(dmach_t channel, dma_t *dma)
81 {
82         /* Need to build a branch at the FIQ address */
83         extern void fdc1772_comendhandler(void);
84         unsigned long flags;
85
86         DPRINTK("arc_floppy_cmdend_enable_dma\n");
87         /*printk("enable_dma fdc1772 command end FIQ\n");*/
88         save_flags(flags);
89         clf();
90         
91         /* B fdc1772_comendhandler */
92         *((unsigned int *)0x1c)=0xea000000 |
93                         (((unsigned int)fdc1772_comendhandler-(0x1c+8))/4);
94
95         local_irq_restore(flags);
96 }
97
98 static int arc_floppy_cmdend_get_dma_residue(dmach_t channel, dma_t *dma)
99 {
100         /* 10/1/1999 DAG - Presume whether there is an outstanding command? */
101         extern unsigned int fdc1772_fdc_int_done;
102
103         /* Explicit! If the int done is 0 then 1 int to go */
104         return (fdc1772_fdc_int_done==0)?1:0;
105 }
106
107 static void arc_disable_dma(dmach_t channel, dma_t *dma)
108 {
109         disable_fiq(dma->dma_irq);
110 }
111
112 static struct dma_ops arc_floppy_data_dma_ops = {
113         .type           = "FIQDMA",
114         .enable         = arc_floppy_data_enable_dma,
115         .disable        = arc_disable_dma,
116         .residue        = arc_floppy_data_get_dma_residue,
117 };
118
119 static struct dma_ops arc_floppy_cmdend_dma_ops = {
120         .type           = "FIQCMD",
121         .enable         = arc_floppy_cmdend_enable_dma,
122         .disable        = arc_disable_dma,
123         .residue        = arc_floppy_cmdend_get_dma_residue,
124 };
125 #endif
126
127 #ifdef CONFIG_ARCH_A5K
128 static struct fiq_handler fh = {
129         .name   = "floppydata"
130 };
131
132 static int a5k_floppy_get_dma_residue(dmach_t channel, dma_t *dma)
133 {
134         struct pt_regs regs;
135         get_fiq_regs(&regs);
136         return regs.ARM_r9;
137 }
138
139 static void a5k_floppy_enable_dma(dmach_t channel, dma_t *dma)
140 {
141         struct pt_regs regs;
142         void *fiqhandler_start;
143         unsigned int fiqhandler_length;
144         extern void floppy_fiqsetup(unsigned long len, unsigned long addr,
145                                      unsigned long port);
146
147         if (dma->using_sg)
148                 BUG();
149
150         if (dma->dma_mode == DMA_MODE_READ) {
151                 extern unsigned char floppy_fiqin_start, floppy_fiqin_end;
152                 fiqhandler_start = &floppy_fiqin_start;
153                 fiqhandler_length = &floppy_fiqin_end - &floppy_fiqin_start;
154         } else {
155                 extern unsigned char floppy_fiqout_start, floppy_fiqout_end;
156                 fiqhandler_start = &floppy_fiqout_start;
157                 fiqhandler_length = &floppy_fiqout_end - &floppy_fiqout_start;
158         }
159         if (claim_fiq(&fh)) {
160                 printk("floppydma: couldn't claim FIQ.\n");
161                 return;
162         }
163         memcpy((void *)0x1c, fiqhandler_start, fiqhandler_length);
164         regs.ARM_r9 = dma->buf.length;
165         regs.ARM_r10 = (unsigned long)dma->buf.__address;
166         regs.ARM_fp = FLOPPYDMA_BASE;
167         set_fiq_regs(&regs);
168         enable_fiq(dma->dma_irq);
169 }
170
171 static void a5k_floppy_disable_dma(dmach_t channel, dma_t *dma)
172 {
173         disable_fiq(dma->dma_irq);
174         release_fiq(&fh);
175 }
176
177 static struct dma_ops a5k_floppy_dma_ops = {
178         .type           = "FIQDMA",
179         .enable         = a5k_floppy_enable_dma,
180         .disable        = a5k_floppy_disable_dma,
181         .residue        = a5k_floppy_get_dma_residue,
182 };
183 #endif
184
185 /*
186  * This is virtual DMA - we don't need anything here
187  */
188 static void sound_enable_disable_dma(dmach_t channel, dma_t *dma)
189 {
190 }
191
192 static struct dma_ops sound_dma_ops = {
193         .type           = "VIRTUAL",
194         .enable         = sound_enable_disable_dma,
195         .disable        = sound_enable_disable_dma,
196 };
197
198 void __init arch_dma_init(dma_t *dma)
199 {
200 #if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE)
201         if (machine_is_archimedes()) {
202                 dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA;
203                 dma[DMA_VIRTUAL_FLOPPY0].d_ops   = &arc_floppy_data_dma_ops;
204                 dma[DMA_VIRTUAL_FLOPPY1].dma_irq = 1;
205                 dma[DMA_VIRTUAL_FLOPPY1].d_ops   = &arc_floppy_cmdend_dma_ops;
206         }
207 #endif
208 #ifdef CONFIG_ARCH_A5K
209         if (machine_is_a5k()) {
210                 dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA;
211                 dma[DMA_VIRTUAL_FLOPPY0].d_ops   = &a5k_floppy_dma_ops;
212         }
213 #endif
214         dma[DMA_VIRTUAL_SOUND].d_ops = &sound_dma_ops;
215 }