aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/include/asm/dma.h
blob: a7e06e25c7083b6648109f66a4e04f551672cf86 (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
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
#ifndef _ASM_POWERPC_DMA_H
#define _ASM_POWERPC_DMA_H
#ifdef __KERNEL__

/*
 * Defines for using and allocating dma channels.
 * Written by Hennus Bergman, 1992.
 * High DMA channel support & info by Hannu Savolainen
 * and John Boyd, Nov. 1992.
 * Changes for ppc sound by Christoph Nadig
 */

/*
 * Note: Adapted for PowerPC by Gary Thomas
 * Modified by Cort Dougan <cort@cs.nmt.edu>
 *
 * None of this really applies for Power Macintoshes.  There is
 * basically just enough here to get kernel/dma.c to compile.
 *
 * There may be some comments or restrictions made here which are
 * not valid for the PReP platform.  Take what you read
 * with a grain of salt.
 */

#include <asm/io.h>
#include <linux/spinlock.h>
#include <asm/system.h>

#ifndef MAX_DMA_CHANNELS
#define MAX_DMA_CHANNELS	8
#endif

/* The maximum address that we can perform a DMA transfer to on this platform */
/* Doesn't really apply... */
#define MAX_DMA_ADDRESS		(~0UL)

#if !defined(CONFIG_PPC_ISERIES) || defined(CONFIG_PCI)

#ifdef HAVE_REALLY_SLOW_DMA_CONTROLLER
#define dma_outb	outb_p
#else
#define dma_outb	outb
#endif

#define dma_inb		inb

/*
 * NOTES about DMA transfers:
 *
 *  controller 1: channels 0-3, byte operations, ports 00-1F
 *  controller 2: channels 4-7, word operations, ports C0-DF
 *
 *  - ALL registers are 8 bits only, regardless of transfer size
 *  - channel 4 is not used - cascades 1 into 2.
 *  - channels 0-3 are byte - addresses/counts are for physical bytes
 *  - channels 5-7 are word - addresses/counts are for physical words
 *  - transfers must not cross physical 64K (0-3) or 128K (5-7) boundaries
 *  - transfer count loaded to registers is 1 less than actual count
 *  - controller 2 offsets are all even (2x offsets for controller 1)
 *  - page registers for 5-7 don't use data bit 0, represent 128K pages
 *  - page registers for 0-3 use bit 0, represent 64K pages
 *
 * On PReP, DMA transfers are limited to the lower 16MB of _physical_ memory.
 * On CHRP, the W83C553F (and VLSI Tollgate?) support full 32 bit addressing.
 * Note that addresses loaded into registers must be _physical_ addresses,
 * not logical addresses (which may differ if paging is active).
 *
 *  Address mapping for channels 0-3:
 *
 *   A23 ... A16 A15 ... A8  A7 ... A0    (Physical addresses)
 *    |  ...  |   |  ... |   |  ... |
 *    |  ...  |   |  ... |   |  ... |
 *    |  ...  |   |  ... |   |  ... |
 *   P7  ...  P0  A7 ... A0  A7 ... A0
 * |    Page    | Addr MSB | Addr LSB |   (DMA registers)
 *
 *  Address mapping for channels 5-7:
 *
 *   A23 ... A17 A16 A15 ... A9 A8 A7 ... A1 A0    (Physical addresses)
 *    |  ...  |   \   \   ... \  \  \  ... \  \
 *    |  ...  |    \   \   ... \  \  \  ... \  (not used)
 *    |  ...  |     \   \   ... \  \  \  ... \
 *   P7  ...  P1 (0) A7 A6  ... A0 A7 A6 ... A0
 * |      Page      |  Addr MSB   |  Addr LSB  |   (DMA registers)
 *
 * Again, channels 5-7 transfer _physical_ words (16 bits), so addresses
 * and counts _must_ be word-aligned (the lowest address bit is _ignored_ at
 * the hardware level, so odd-byte transfers aren't possible).
 *
 * Transfer count (_not # bytes_) is limited to 64K, represented as actual
 * count - 1 : 64K => 0xFFFF, 1 => 0x0000.  Thus, count is always 1 or more,
 * and up to 128K bytes may be transferred on channels 5-7 in one operation.
 *
 */

/* 8237 DMA controllers */
#define IO_DMA1_BASE	0x00	/* 8 bit slave DMA, channels 0..3 */
#define IO_DMA2_BASE	0xC0	/* 16 bit master DMA, ch 4(=slave input)..7 */

/* DMA controller registers */
#define DMA1_CMD_REG		0x08	/* command register (w) */
#define DMA1_STAT_REG		0x08	/* status register (r) */
#define DMA1_REQ_REG		0x09	/* request register (w) */
#define DMA1_MASK_REG		0x0A	/* single-channel mask (w) */
#define DMA1_MODE_REG		0x0B	/* mode register (w) */
#define DMA1_CLEAR_FF_REG	0x0C	/* clear pointer flip-flop (w) */
#define DMA1_TEMP_REG		0x0D	/* Temporary Register (r) */
#define DMA1_RESET_REG		0x0D	/* Master Clear (w) */
#define DMA1_CLR_MASK_REG	0x0E	/* Clear Mask */
#define DMA1_MASK_ALL_REG	0x0F	/* all-channels mask (w) */

#define DMA2_CMD_REG		0xD0	/* command register (w) */
#define DMA2_STAT_REG		0xD0	/* status register (r) */
#define DMA2_REQ_REG		0xD2	/* request register (w) */
#define DMA2_MASK_REG		0xD4	/* single-channel mask (w) */
#define DMA2_MODE_REG		0xD6	/* mode register (w) */
#define DMA2_CLEAR_FF_REG	0xD8	/* clear pointer flip-flop (w) */
#define DMA2_TEMP_REG		0xDA	/* Temporary Register (r) */
#define DMA2_RESET_REG		0xDA	/* Master Clear (w) */
#define DMA2_CLR_MASK_REG	0xDC	/* Clear Mask */
#define DMA2_MASK_ALL_REG	0xDE	/* all-channels mask (w) */

#define DMA_ADDR_0		0x00	/* DMA address registers */
#define DMA_ADDR_1		0x02
#define DMA_ADDR_2		0x04
#define DMA_ADDR_3		0x06
#define DMA_ADDR_4		0xC0
#define DMA_ADDR_5		0xC4
#define DMA_ADDR_6		0xC8
#define DMA_ADDR_7		0xCC

#define DMA_CNT_0		0x01	/* DMA count registers */
#define DMA_CNT_1		0x03
#define DMA_CNT_2		0x05
#define DMA_CNT_3		0x07
#define DMA_CNT_4		0xC2
#define DMA_CNT_5		0xC6
#define DMA_CNT_6		0xCA
#define DMA_CNT_7		0xCE

#define DMA_LO_PAGE_0		0x87	/* DMA page registers */
#define DMA_LO_PAGE_1		0x83
#define DMA_LO_PAGE_2		0x81
#define DMA_LO_PAGE_3		0x82
#define DMA_LO_PAGE_5		0x8B
#define DMA_LO_PAGE_6		0x89
#define DMA_LO_PAGE_7		0x8A

#define DMA_HI_PAGE_0		0x487	/* DMA page registers */
#define DMA_HI_PAGE_1		0x483
#define DMA_HI_PAGE_2		0x481
#define DMA_HI_PAGE_3		0x482
#define DMA_HI_PAGE_5		0x48B
#define DMA_HI_PAGE_6		0x489
#define DMA_HI_PAGE_7		0x48A

#define DMA1_EXT_REG		0x40B
#define DMA2_EXT_REG		0x4D6

#ifndef __powerpc64__
    /* in arch/ppc/kernel/setup.c -- Cort */
    extern unsigned int DMA_MODE_WRITE;
    extern unsigned int DMA_MODE_READ;
    extern unsigned long ISA_DMA_THRESHOLD;
#else
    #define DMA_MODE_READ	0x44	/* I/O to memory, no autoinit, increment, single mode */
    #define DMA_MODE_WRITE	0x48	/* memory to I/O, no autoinit, increment, single mode */
#endif

#define DMA_MODE_CASCADE	0xC0	/* pass thru DREQ->HRQ, DACK<-HLDA only */

#define DMA_AUTOINIT		0x10

extern spinlock_t dma_spin_lock;

static __inline__ unsigned long claim_dma_lock(void)
{
	unsigned long flags;
	spin_lock_irqsave(&dma_spin_lock, flags);
	return flags;
}

static __inline__ void release_dma_lock(unsigned long flags)
{
	spin_unlock_irqrestore(&dma_spin_lock, flags);
}

/* enable/disable a specific DMA channel */
static __inline__ void enable_dma(unsigned int dmanr)
{
	unsigned char ucDmaCmd = 0x00;

	if (dmanr != 4) {
		dma_outb(0, DMA2_MASK_REG);	/* This may not be enabled */
		dma_outb(ucDmaCmd, DMA2_CMD_REG);	/* Enable group */
	}
	if (dmanr <= 3) {
		dma_outb(dmanr, DMA1_MASK_REG);
		dma_outb(ucDmaCmd, DMA1_CMD_REG);	/* Enable group */
	} else {
		dma_outb(dmanr & 3, DMA2_MASK_REG);
	}
}

static __inline__ void disable_dma(unsigned int dmanr)
{
	if (dmanr <= 3)
		dma_outb(dmanr | 4, DMA1_MASK_REG);
	else
		dma_outb((dmanr & 3) | 4, DMA2_MASK_REG);
}

/* Clear the 'DMA Pointer Flip Flop'.
 * Write 0 for LSB/MSB, 1 for MSB/LSB access.
 * Use this once to initialize the FF to a known state.
 * After that, keep track of it. :-)
 * --- In order to do that, the DMA routines below should ---
 * --- only be used while interrupts are disabled! ---
 */
static __inline__ void clear_dma_ff(unsigned int dmanr)
{
	if (dmanr <= 3)
		dma_outb(0, DMA1_CLEAR_FF_REG);
	else
		dma_outb(0, DMA2_CLEAR_FF_REG);
}

/* set mode (above) for a specific DMA channel */
static __inline__ void set_dma_mode(unsigned int dmanr, char mode)
{
	if (dmanr <= 3)
		dma_outb(mode | dmanr, DMA1_MODE_REG);
	else
		dma_outb(mode | (dmanr & 3), DMA2_MODE_REG);
}

/* Set only the page register bits of the transfer address.
 * This is used for successive transfers when we know the contents of
 * the lower 16 bits of the DMA current address register, but a 64k boundary
 * may have been crossed.
 */
static __inline__ void set_dma_page(unsigned int dmanr, int pagenr)
{
	switch (dmanr) {
	case 0:
		dma_outb(pagenr, DMA_LO_PAGE_0);
		dma_outb(pagenr >> 8, DMA_HI_PAGE_0);
		break;
	case 1:
		dma_outb(pagenr, DMA_LO_PAGE_1);
		dma_outb(pagenr >> 8, DMA_HI_PAGE_1);
		break;
	case 2:
		dma_outb(pagenr, DMA_LO_PAGE_2);
		dma_outb(pagenr >> 8, DMA_HI_PAGE_2);
		break;
	case 3:
		dma_outb(pagenr, DMA_LO_PAGE_3);
		dma_outb(pagenr >> 8, DMA_HI_PAGE_3);
		break;
	case 5:
		dma_outb(pagenr & 0xfe, DMA_LO_PAGE_5);
		dma_outb(pagenr >> 8, DMA_HI_PAGE_5);
		break;
	case 6:
		dma_outb(pagenr & 0xfe, DMA_LO_PAGE_6);
		dma_outb(pagenr >> 8, DMA_HI_PAGE_6);
		break;
	case 7:
		dma_outb(pagenr & 0xfe, DMA_LO_PAGE_7);
		dma_outb(pagenr >> 8, DMA_HI_PAGE_7);
		break;
	}
}

/* Set transfer address & page bits for specific DMA channel.
 * Assumes dma flipflop is clear.
 */
static __inline__ void set_dma_addr(unsigned int dmanr, unsigned int phys)
{
	if (dmanr <= 3) {
		dma_outb(phys & 0xff,
			 ((dmanr & 3) << 1) + IO_DMA1_BASE);
		dma_outb((phys >> 8) & 0xff,
			 ((dmanr & 3) << 1) + IO_DMA1_BASE);
	} else {
		dma_outb((phys >> 1) & 0xff,
			 ((dmanr & 3) << 2) + IO_DMA2_BASE);
		dma_outb((phys >> 9) & 0xff,
			 ((dmanr & 3) << 2) + IO_DMA2_BASE);
	}
	set_dma_page(dmanr, phys >> 16);
}


/* Set transfer size (max 64k for DMA1..3, 128k for DMA5..7) for
 * a specific DMA channel.
 * You must ensure the parameters are valid.
 * NOTE: from a manual: "the number of transfers is one more
 * than the initial word count"! This is taken into account.
 * Assumes dma flip-flop is clear.
 * NOTE 2: "count" represents _bytes_ and must be even for channels 5-7.
 */
static __inline__ void set_dma_count(unsigned int dmanr, unsigned int count)
{
	count--;
	if (dmanr <= 3) {
		dma_outb(count & 0xff,
			 ((dmanr & 3) << 1) + 1 + IO_DMA1_BASE);
		dma_outb((count >> 8) & 0xff,
			 ((dmanr & 3) << 1) + 1 + IO_DMA1_BASE);
	} else {
		dma_outb((count >> 1) & 0xff,
			 ((dmanr & 3) << 2) + 2 + IO_DMA2_BASE);
		dma_outb((count >> 9) & 0xff,
			 ((dmanr & 3) << 2) + 2 + IO_DMA2_BASE);
	}
}


/* Get DMA residue count. After a DMA transfer, this
 * should return zero. Reading this while a DMA transfer is
 * still in progress will return unpredictable results.
 * If called before the channel has been used, it may return 1.
 * Otherwise, it returns the number of _bytes_ left to transfer.
 *
 * Assumes DMA flip-flop is clear.
 */
static __inline__ int get_dma_residue(unsigned int dmanr)
{
	unsigned int io_port = (dmanr <= 3)
	    ? ((dmanr & 3) << 1) + 1 + IO_DMA1_BASE
	    : ((dmanr & 3) << 2) + 2 + IO_DMA2_BASE;

	/* using short to get 16-bit wrap around */
	unsigned short count;

	count = 1 + dma_inb(io_port);
	count += dma_inb(io_port) << 8;

	return (dmanr <= 3) ? count : (count << 1);
}

/* These are in kernel/dma.c: */

/* reserve a DMA channel */
extern int request_dma(unsigned int dmanr, const char *device_id);
/* release it again */
extern void free_dma(unsigned int dmanr);

#ifdef CONFIG_PCI
extern int isa_dma_bridge_buggy;
#else
#define isa_dma_bridge_buggy	(0)
#endif

#endif	/* !defined(CONFIG_PPC_ISERIES) || defined(CONFIG_PCI) */

#endif /* __KERNEL__ */
#endif	/* _ASM_POWERPC_DMA_H */