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
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
|
/*
* OMAP1/OMAP7xx - specific DMA driver
*
* Copyright (C) 2003 - 2008 Nokia Corporation
* Author: Juha Yrjölä <juha.yrjola@nokia.com>
* DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
* Graphics DMA and LCD DMA graphics tranformations
* by Imre Deak <imre.deak@nokia.com>
* OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
* Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
*
* Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
* Converted DMA library into platform driver
* - G, Manjunath Kondaiah <manjugk@ti.com>
*
* 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.
*/
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>
#include <linux/omap-dma.h>
#include <mach/tc.h>
#include <mach/irqs.h>
#define OMAP1_DMA_BASE (0xfffed800)
#define OMAP1_LOGICAL_DMA_CH_COUNT 17
static u32 enable_1510_mode;
static const struct omap_dma_reg reg_map[] = {
[GCR] = { 0x0400, 0x00, OMAP_DMA_REG_16BIT },
[GSCR] = { 0x0404, 0x00, OMAP_DMA_REG_16BIT },
[GRST1] = { 0x0408, 0x00, OMAP_DMA_REG_16BIT },
[HW_ID] = { 0x0442, 0x00, OMAP_DMA_REG_16BIT },
[PCH2_ID] = { 0x0444, 0x00, OMAP_DMA_REG_16BIT },
[PCH0_ID] = { 0x0446, 0x00, OMAP_DMA_REG_16BIT },
[PCH1_ID] = { 0x0448, 0x00, OMAP_DMA_REG_16BIT },
[PCHG_ID] = { 0x044a, 0x00, OMAP_DMA_REG_16BIT },
[PCHD_ID] = { 0x044c, 0x00, OMAP_DMA_REG_16BIT },
[CAPS_0] = { 0x044e, 0x00, OMAP_DMA_REG_2X16BIT },
[CAPS_1] = { 0x0452, 0x00, OMAP_DMA_REG_2X16BIT },
[CAPS_2] = { 0x0456, 0x00, OMAP_DMA_REG_16BIT },
[CAPS_3] = { 0x0458, 0x00, OMAP_DMA_REG_16BIT },
[CAPS_4] = { 0x045a, 0x00, OMAP_DMA_REG_16BIT },
[PCH2_SR] = { 0x0460, 0x00, OMAP_DMA_REG_16BIT },
[PCH0_SR] = { 0x0480, 0x00, OMAP_DMA_REG_16BIT },
[PCH1_SR] = { 0x0482, 0x00, OMAP_DMA_REG_16BIT },
[PCHD_SR] = { 0x04c0, 0x00, OMAP_DMA_REG_16BIT },
/* Common Registers */
[CSDP] = { 0x0000, 0x40, OMAP_DMA_REG_16BIT },
[CCR] = { 0x0002, 0x40, OMAP_DMA_REG_16BIT },
[CICR] = { 0x0004, 0x40, OMAP_DMA_REG_16BIT },
[CSR] = { 0x0006, 0x40, OMAP_DMA_REG_16BIT },
[CEN] = { 0x0010, 0x40, OMAP_DMA_REG_16BIT },
[CFN] = { 0x0012, 0x40, OMAP_DMA_REG_16BIT },
[CSFI] = { 0x0014, 0x40, OMAP_DMA_REG_16BIT },
[CSEI] = { 0x0016, 0x40, OMAP_DMA_REG_16BIT },
[CPC] = { 0x0018, 0x40, OMAP_DMA_REG_16BIT }, /* 15xx only */
[CSAC] = { 0x0018, 0x40, OMAP_DMA_REG_16BIT },
[CDAC] = { 0x001a, 0x40, OMAP_DMA_REG_16BIT },
[CDEI] = { 0x001c, 0x40, OMAP_DMA_REG_16BIT },
[CDFI] = { 0x001e, 0x40, OMAP_DMA_REG_16BIT },
[CLNK_CTRL] = { 0x0028, 0x40, OMAP_DMA_REG_16BIT },
/* Channel specific register offsets */
[CSSA] = { 0x0008, 0x40, OMAP_DMA_REG_2X16BIT },
[CDSA] = { 0x000c, 0x40, OMAP_DMA_REG_2X16BIT },
[COLOR] = { 0x0020, 0x40, OMAP_DMA_REG_2X16BIT },
[CCR2] = { 0x0024, 0x40, OMAP_DMA_REG_16BIT },
[LCH_CTRL] = { 0x002a, 0x40, OMAP_DMA_REG_16BIT },
};
static struct resource res[] __initdata = {
[0] = {
.start = OMAP1_DMA_BASE,
.end = OMAP1_DMA_BASE + SZ_2K - 1,
.flags = IORESOURCE_MEM,
},
[1] = {
.name = "0",
.start = INT_DMA_CH0_6,
.flags = IORESOURCE_IRQ,
},
[2] = {
.name = "1",
.start = INT_DMA_CH1_7,
.flags = IORESOURCE_IRQ,
},
[3] = {
.name = "2",
.start = INT_DMA_CH2_8,
.flags = IORESOURCE_IRQ,
},
[4] = {
.name = "3",
.start = INT_DMA_CH3,
.flags = IORESOURCE_IRQ,
},
[5] = {
.name = "4",
.start = INT_DMA_CH4,
.flags = IORESOURCE_IRQ,
},
[6] = {
.name = "5",
.start = INT_DMA_CH5,
.flags = IORESOURCE_IRQ,
},
/* Handled in lcd_dma.c */
[7] = {
.name = "6",
.start = INT_1610_DMA_CH6,
.flags = IORESOURCE_IRQ,
},
/* irq's for omap16xx and omap7xx */
[8] = {
.name = "7",
.start = INT_1610_DMA_CH7,
.flags = IORESOURCE_IRQ,
},
[9] = {
.name = "8",
.start = INT_1610_DMA_CH8,
.flags = IORESOURCE_IRQ,
},
[10] = {
.name = "9",
.start = INT_1610_DMA_CH9,
.flags = IORESOURCE_IRQ,
},
[11] = {
.name = "10",
.start = INT_1610_DMA_CH10,
.flags = IORESOURCE_IRQ,
},
[12] = {
.name = "11",
.start = INT_1610_DMA_CH11,
.flags = IORESOURCE_IRQ,
},
[13] = {
.name = "12",
.start = INT_1610_DMA_CH12,
.flags = IORESOURCE_IRQ,
},
[14] = {
.name = "13",
.start = INT_1610_DMA_CH13,
.flags = IORESOURCE_IRQ,
},
[15] = {
.name = "14",
.start = INT_1610_DMA_CH14,
.flags = IORESOURCE_IRQ,
},
[16] = {
.name = "15",
.start = INT_1610_DMA_CH15,
.flags = IORESOURCE_IRQ,
},
[17] = {
.name = "16",
.start = INT_DMA_LCD,
.flags = IORESOURCE_IRQ,
},
};
static void __iomem *dma_base;
static inline void dma_write(u32 val, int reg, int lch)
{
void __iomem *addr = dma_base;
addr += reg_map[reg].offset;
addr += reg_map[reg].stride * lch;
__raw_writew(val, addr);
if (reg_map[reg].type == OMAP_DMA_REG_2X16BIT)
__raw_writew(val >> 16, addr + 2);
}
static inline u32 dma_read(int reg, int lch)
{
void __iomem *addr = dma_base;
uint32_t val;
addr += reg_map[reg].offset;
addr += reg_map[reg].stride * lch;
val = __raw_readw(addr);
if (reg_map[reg].type == OMAP_DMA_REG_2X16BIT)
val |= __raw_readw(addr + 2) << 16;
return val;
}
static void omap1_clear_lch_regs(int lch)
{
int i;
for (i = CPC; i <= COLOR; i += 1)
dma_write(0, i, lch);
}
static void omap1_clear_dma(int lch)
{
u32 l;
l = dma_read(CCR, lch);
l &= ~OMAP_DMA_CCR_EN;
dma_write(l, CCR, lch);
/* Clear pending interrupts */
l = dma_read(CSR, lch);
}
static void omap1_show_dma_caps(void)
{
if (enable_1510_mode) {
printk(KERN_INFO "DMA support for OMAP15xx initialized\n");
} else {
u16 w;
printk(KERN_INFO "OMAP DMA hardware version %d\n",
dma_read(HW_ID, 0));
printk(KERN_INFO "DMA capabilities: %08x:%08x:%04x:%04x:%04x\n",
dma_read(CAPS_0, 0), dma_read(CAPS_1, 0),
dma_read(CAPS_2, 0), dma_read(CAPS_3, 0),
dma_read(CAPS_4, 0));
/* Disable OMAP 3.0/3.1 compatibility mode. */
w = dma_read(GSCR, 0);
w |= 1 << 3;
dma_write(w, GSCR, 0);
}
return;
}
static unsigned configure_dma_errata(void)
{
unsigned errata = 0;
/*
* Erratum 3.2/3.3: sometimes 0 is returned if CSAC/CDAC is
* read before the DMA controller finished disabling the channel.
*/
if (!cpu_is_omap15xx())
SET_DMA_ERRATA(DMA_ERRATA_3_3);
return errata;
}
static const struct platform_device_info omap_dma_dev_info = {
.name = "omap-dma-engine",
.id = -1,
.dma_mask = DMA_BIT_MASK(32),
};
static int __init omap1_system_dma_init(void)
{
struct omap_system_dma_plat_info *p;
struct omap_dma_dev_attr *d;
struct platform_device *pdev, *dma_pdev;
int ret;
pdev = platform_device_alloc("omap_dma_system", 0);
if (!pdev) {
pr_err("%s: Unable to device alloc for dma\n",
__func__);
return -ENOMEM;
}
dma_base = ioremap(res[0].start, resource_size(&res[0]));
if (!dma_base) {
pr_err("%s: Unable to ioremap\n", __func__);
ret = -ENODEV;
goto exit_device_put;
}
ret = platform_device_add_resources(pdev, res, ARRAY_SIZE(res));
if (ret) {
dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
__func__, pdev->name, pdev->id);
goto exit_iounmap;
}
p = kzalloc(sizeof(struct omap_system_dma_plat_info), GFP_KERNEL);
if (!p) {
dev_err(&pdev->dev, "%s: Unable to allocate 'p' for %s\n",
__func__, pdev->name);
ret = -ENOMEM;
goto exit_iounmap;
}
d = kzalloc(sizeof(struct omap_dma_dev_attr), GFP_KERNEL);
if (!d) {
dev_err(&pdev->dev, "%s: Unable to allocate 'd' for %s\n",
__func__, pdev->name);
ret = -ENOMEM;
goto exit_release_p;
}
d->lch_count = OMAP1_LOGICAL_DMA_CH_COUNT;
/* Valid attributes for omap1 plus processors */
if (cpu_is_omap15xx())
d->dev_caps = ENABLE_1510_MODE;
enable_1510_mode = d->dev_caps & ENABLE_1510_MODE;
if (cpu_is_omap16xx())
d->dev_caps = ENABLE_16XX_MODE;
d->dev_caps |= SRC_PORT;
d->dev_caps |= DST_PORT;
d->dev_caps |= SRC_INDEX;
d->dev_caps |= DST_INDEX;
d->dev_caps |= IS_BURST_ONLY4;
d->dev_caps |= CLEAR_CSR_ON_READ;
d->dev_caps |= IS_WORD_16;
d->chan = kzalloc(sizeof(struct omap_dma_lch) *
(d->lch_count), GFP_KERNEL);
if (!d->chan) {
dev_err(&pdev->dev,
"%s: Memory allocation failed for d->chan!\n",
__func__);
ret = -ENOMEM;
goto exit_release_d;
}
if (cpu_is_omap15xx())
d->chan_count = 9;
else if (cpu_is_omap16xx() || cpu_is_omap7xx()) {
if (!(d->dev_caps & ENABLE_1510_MODE))
d->chan_count = 16;
else
d->chan_count = 9;
}
p->dma_attr = d;
p->show_dma_caps = omap1_show_dma_caps;
p->clear_lch_regs = omap1_clear_lch_regs;
p->clear_dma = omap1_clear_dma;
p->dma_write = dma_write;
p->dma_read = dma_read;
p->errata = configure_dma_errata();
ret = platform_device_add_data(pdev, p, sizeof(*p));
if (ret) {
dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
__func__, pdev->name, pdev->id);
goto exit_release_chan;
}
ret = platform_device_add(pdev);
if (ret) {
dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
__func__, pdev->name, pdev->id);
goto exit_release_chan;
}
dma_pdev = platform_device_register_full(&omap_dma_dev_info);
if (IS_ERR(dma_pdev)) {
ret = PTR_ERR(dma_pdev);
goto exit_release_pdev;
}
return ret;
exit_release_pdev:
platform_device_del(pdev);
exit_release_chan:
kfree(d->chan);
exit_release_d:
kfree(d);
exit_release_p:
kfree(p);
exit_iounmap:
iounmap(dma_base);
exit_device_put:
platform_device_put(pdev);
return ret;
}
arch_initcall(omap1_system_dma_init);
|
