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-rw-r--r--arch/arm/mach-omap1/dma.c390
1 files changed, 390 insertions, 0 deletions
diff --git a/arch/arm/mach-omap1/dma.c b/arch/arm/mach-omap1/dma.c
new file mode 100644
index 000000000000..d8559344c6e2
--- /dev/null
+++ b/arch/arm/mach-omap1/dma.c
@@ -0,0 +1,390 @@
1/*
2 * OMAP1/OMAP7xx - specific DMA driver
3 *
4 * Copyright (C) 2003 - 2008 Nokia Corporation
5 * Author: Juha Yrjölä <juha.yrjola@nokia.com>
6 * DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
7 * Graphics DMA and LCD DMA graphics tranformations
8 * by Imre Deak <imre.deak@nokia.com>
9 * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
10 * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
11 *
12 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
13 * Converted DMA library into platform driver
14 * - G, Manjunath Kondaiah <manjugk@ti.com>
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2 as
18 * published by the Free Software Foundation.
19 */
20
21#include <linux/err.h>
22#include <linux/io.h>
23#include <linux/slab.h>
24#include <linux/module.h>
25#include <linux/init.h>
26#include <linux/device.h>
27
28#include <plat/dma.h>
29#include <plat/tc.h>
30#include <plat/irqs.h>
31
32#define OMAP1_DMA_BASE (0xfffed800)
33#define OMAP1_LOGICAL_DMA_CH_COUNT 17
34#define OMAP1_DMA_STRIDE 0x40
35
36static u32 errata;
37static u32 enable_1510_mode;
38static u8 dma_stride;
39static enum omap_reg_offsets dma_common_ch_start, dma_common_ch_end;
40
41static u16 reg_map[] = {
42 [GCR] = 0x400,
43 [GSCR] = 0x404,
44 [GRST1] = 0x408,
45 [HW_ID] = 0x442,
46 [PCH2_ID] = 0x444,
47 [PCH0_ID] = 0x446,
48 [PCH1_ID] = 0x448,
49 [PCHG_ID] = 0x44a,
50 [PCHD_ID] = 0x44c,
51 [CAPS_0] = 0x44e,
52 [CAPS_1] = 0x452,
53 [CAPS_2] = 0x456,
54 [CAPS_3] = 0x458,
55 [CAPS_4] = 0x45a,
56 [PCH2_SR] = 0x460,
57 [PCH0_SR] = 0x480,
58 [PCH1_SR] = 0x482,
59 [PCHD_SR] = 0x4c0,
60
61 /* Common Registers */
62 [CSDP] = 0x00,
63 [CCR] = 0x02,
64 [CICR] = 0x04,
65 [CSR] = 0x06,
66 [CEN] = 0x10,
67 [CFN] = 0x12,
68 [CSFI] = 0x14,
69 [CSEI] = 0x16,
70 [CPC] = 0x18, /* 15xx only */
71 [CSAC] = 0x18,
72 [CDAC] = 0x1a,
73 [CDEI] = 0x1c,
74 [CDFI] = 0x1e,
75 [CLNK_CTRL] = 0x28,
76
77 /* Channel specific register offsets */
78 [CSSA] = 0x08,
79 [CDSA] = 0x0c,
80 [COLOR] = 0x20,
81 [CCR2] = 0x24,
82 [LCH_CTRL] = 0x2a,
83};
84
85static struct resource res[] __initdata = {
86 [0] = {
87 .start = OMAP1_DMA_BASE,
88 .end = OMAP1_DMA_BASE + SZ_2K - 1,
89 .flags = IORESOURCE_MEM,
90 },
91 [1] = {
92 .name = "0",
93 .start = INT_DMA_CH0_6,
94 .flags = IORESOURCE_IRQ,
95 },
96 [2] = {
97 .name = "1",
98 .start = INT_DMA_CH1_7,
99 .flags = IORESOURCE_IRQ,
100 },
101 [3] = {
102 .name = "2",
103 .start = INT_DMA_CH2_8,
104 .flags = IORESOURCE_IRQ,
105 },
106 [4] = {
107 .name = "3",
108 .start = INT_DMA_CH3,
109 .flags = IORESOURCE_IRQ,
110 },
111 [5] = {
112 .name = "4",
113 .start = INT_DMA_CH4,
114 .flags = IORESOURCE_IRQ,
115 },
116 [6] = {
117 .name = "5",
118 .start = INT_DMA_CH5,
119 .flags = IORESOURCE_IRQ,
120 },
121 /* Handled in lcd_dma.c */
122 [7] = {
123 .name = "6",
124 .start = INT_1610_DMA_CH6,
125 .flags = IORESOURCE_IRQ,
126 },
127 /* irq's for omap16xx and omap7xx */
128 [8] = {
129 .name = "7",
130 .start = INT_1610_DMA_CH7,
131 .flags = IORESOURCE_IRQ,
132 },
133 [9] = {
134 .name = "8",
135 .start = INT_1610_DMA_CH8,
136 .flags = IORESOURCE_IRQ,
137 },
138 [10] = {
139 .name = "9",
140 .start = INT_1610_DMA_CH9,
141 .flags = IORESOURCE_IRQ,
142 },
143 [11] = {
144 .name = "10",
145 .start = INT_1610_DMA_CH10,
146 .flags = IORESOURCE_IRQ,
147 },
148 [12] = {
149 .name = "11",
150 .start = INT_1610_DMA_CH11,
151 .flags = IORESOURCE_IRQ,
152 },
153 [13] = {
154 .name = "12",
155 .start = INT_1610_DMA_CH12,
156 .flags = IORESOURCE_IRQ,
157 },
158 [14] = {
159 .name = "13",
160 .start = INT_1610_DMA_CH13,
161 .flags = IORESOURCE_IRQ,
162 },
163 [15] = {
164 .name = "14",
165 .start = INT_1610_DMA_CH14,
166 .flags = IORESOURCE_IRQ,
167 },
168 [16] = {
169 .name = "15",
170 .start = INT_1610_DMA_CH15,
171 .flags = IORESOURCE_IRQ,
172 },
173 [17] = {
174 .name = "16",
175 .start = INT_DMA_LCD,
176 .flags = IORESOURCE_IRQ,
177 },
178};
179
180static void __iomem *dma_base;
181static inline void dma_write(u32 val, int reg, int lch)
182{
183 u8 stride;
184 u32 offset;
185
186 stride = (reg >= dma_common_ch_start) ? dma_stride : 0;
187 offset = reg_map[reg] + (stride * lch);
188
189 __raw_writew(val, dma_base + offset);
190 if ((reg > CLNK_CTRL && reg < CCEN) ||
191 (reg > PCHD_ID && reg < CAPS_2)) {
192 u32 offset2 = reg_map[reg] + 2 + (stride * lch);
193 __raw_writew(val >> 16, dma_base + offset2);
194 }
195}
196
197static inline u32 dma_read(int reg, int lch)
198{
199 u8 stride;
200 u32 offset, val;
201
202 stride = (reg >= dma_common_ch_start) ? dma_stride : 0;
203 offset = reg_map[reg] + (stride * lch);
204
205 val = __raw_readw(dma_base + offset);
206 if ((reg > CLNK_CTRL && reg < CCEN) ||
207 (reg > PCHD_ID && reg < CAPS_2)) {
208 u16 upper;
209 u32 offset2 = reg_map[reg] + 2 + (stride * lch);
210 upper = __raw_readw(dma_base + offset2);
211 val |= (upper << 16);
212 }
213 return val;
214}
215
216static void omap1_clear_lch_regs(int lch)
217{
218 int i = dma_common_ch_start;
219
220 for (; i <= dma_common_ch_end; i += 1)
221 dma_write(0, i, lch);
222}
223
224static void omap1_clear_dma(int lch)
225{
226 u32 l;
227
228 l = dma_read(CCR, lch);
229 l &= ~OMAP_DMA_CCR_EN;
230 dma_write(l, CCR, lch);
231
232 /* Clear pending interrupts */
233 l = dma_read(CSR, lch);
234}
235
236static void omap1_show_dma_caps(void)
237{
238 if (enable_1510_mode) {
239 printk(KERN_INFO "DMA support for OMAP15xx initialized\n");
240 } else {
241 u16 w;
242 printk(KERN_INFO "OMAP DMA hardware version %d\n",
243 dma_read(HW_ID, 0));
244 printk(KERN_INFO "DMA capabilities: %08x:%08x:%04x:%04x:%04x\n",
245 dma_read(CAPS_0, 0), dma_read(CAPS_1, 0),
246 dma_read(CAPS_2, 0), dma_read(CAPS_3, 0),
247 dma_read(CAPS_4, 0));
248
249 /* Disable OMAP 3.0/3.1 compatibility mode. */
250 w = dma_read(GSCR, 0);
251 w |= 1 << 3;
252 dma_write(w, GSCR, 0);
253 }
254 return;
255}
256
257static u32 configure_dma_errata(void)
258{
259
260 /*
261 * Erratum 3.2/3.3: sometimes 0 is returned if CSAC/CDAC is
262 * read before the DMA controller finished disabling the channel.
263 */
264 if (!cpu_is_omap15xx())
265 SET_DMA_ERRATA(DMA_ERRATA_3_3);
266
267 return errata;
268}
269
270static int __init omap1_system_dma_init(void)
271{
272 struct omap_system_dma_plat_info *p;
273 struct omap_dma_dev_attr *d;
274 struct platform_device *pdev;
275 int ret;
276
277 pdev = platform_device_alloc("omap_dma_system", 0);
278 if (!pdev) {
279 pr_err("%s: Unable to device alloc for dma\n",
280 __func__);
281 return -ENOMEM;
282 }
283
284 dma_base = ioremap(res[0].start, resource_size(&res[0]));
285 if (!dma_base) {
286 pr_err("%s: Unable to ioremap\n", __func__);
287 return -ENODEV;
288 }
289
290 ret = platform_device_add_resources(pdev, res, ARRAY_SIZE(res));
291 if (ret) {
292 dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
293 __func__, pdev->name, pdev->id);
294 goto exit_device_del;
295 }
296
297 p = kzalloc(sizeof(struct omap_system_dma_plat_info), GFP_KERNEL);
298 if (!p) {
299 dev_err(&pdev->dev, "%s: Unable to allocate 'p' for %s\n",
300 __func__, pdev->name);
301 ret = -ENOMEM;
302 goto exit_device_put;
303 }
304
305 d = kzalloc(sizeof(struct omap_dma_dev_attr), GFP_KERNEL);
306 if (!d) {
307 dev_err(&pdev->dev, "%s: Unable to allocate 'd' for %s\n",
308 __func__, pdev->name);
309 ret = -ENOMEM;
310 goto exit_release_p;
311 }
312
313 d->lch_count = OMAP1_LOGICAL_DMA_CH_COUNT;
314
315 /* Valid attributes for omap1 plus processors */
316 if (cpu_is_omap15xx())
317 d->dev_caps = ENABLE_1510_MODE;
318 enable_1510_mode = d->dev_caps & ENABLE_1510_MODE;
319
320 d->dev_caps |= SRC_PORT;
321 d->dev_caps |= DST_PORT;
322 d->dev_caps |= SRC_INDEX;
323 d->dev_caps |= DST_INDEX;
324 d->dev_caps |= IS_BURST_ONLY4;
325 d->dev_caps |= CLEAR_CSR_ON_READ;
326 d->dev_caps |= IS_WORD_16;
327
328
329 d->chan = kzalloc(sizeof(struct omap_dma_lch) *
330 (d->lch_count), GFP_KERNEL);
331 if (!d->chan) {
332 dev_err(&pdev->dev, "%s: Memory allocation failed"
333 "for d->chan!!!\n", __func__);
334 goto exit_release_d;
335 }
336
337 if (cpu_is_omap15xx())
338 d->chan_count = 9;
339 else if (cpu_is_omap16xx() || cpu_is_omap7xx()) {
340 if (!(d->dev_caps & ENABLE_1510_MODE))
341 d->chan_count = 16;
342 else
343 d->chan_count = 9;
344 }
345
346 p->dma_attr = d;
347
348 p->show_dma_caps = omap1_show_dma_caps;
349 p->clear_lch_regs = omap1_clear_lch_regs;
350 p->clear_dma = omap1_clear_dma;
351 p->dma_write = dma_write;
352 p->dma_read = dma_read;
353 p->disable_irq_lch = NULL;
354
355 p->errata = configure_dma_errata();
356
357 ret = platform_device_add_data(pdev, p, sizeof(*p));
358 if (ret) {
359 dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
360 __func__, pdev->name, pdev->id);
361 goto exit_release_chan;
362 }
363
364 ret = platform_device_add(pdev);
365 if (ret) {
366 dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n",
367 __func__, pdev->name, pdev->id);
368 goto exit_release_chan;
369 }
370
371 dma_stride = OMAP1_DMA_STRIDE;
372 dma_common_ch_start = CPC;
373 dma_common_ch_end = COLOR;
374
375 return ret;
376
377exit_release_chan:
378 kfree(d->chan);
379exit_release_d:
380 kfree(d);
381exit_release_p:
382 kfree(p);
383exit_device_put:
384 platform_device_put(pdev);
385exit_device_del:
386 platform_device_del(pdev);
387
388 return ret;
389}
390arch_initcall(omap1_system_dma_init);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-19 13:32:35 -0500