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6568f7c4 MK |
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> | |
6568f7c4 MK |
22 | #include <linux/slab.h> |
23 | #include <linux/module.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/device.h> | |
2e3ee9f4 | 26 | #include <linux/io.h> |
6568f7c4 MK |
27 | |
28 | #include <plat/dma.h> | |
29 | #include <plat/tc.h> | |
8afc5e08 TL |
30 | |
31 | #include <mach/irqs.h> | |
6568f7c4 MK |
32 | |
33 | #define OMAP1_DMA_BASE (0xfffed800) | |
f31cc962 MK |
34 | #define OMAP1_LOGICAL_DMA_CH_COUNT 17 |
35 | #define OMAP1_DMA_STRIDE 0x40 | |
36 | ||
37 | static u32 errata; | |
38 | static u32 enable_1510_mode; | |
39 | static u8 dma_stride; | |
40 | static enum omap_reg_offsets dma_common_ch_start, dma_common_ch_end; | |
41 | ||
42 | static u16 reg_map[] = { | |
43 | [GCR] = 0x400, | |
44 | [GSCR] = 0x404, | |
45 | [GRST1] = 0x408, | |
46 | [HW_ID] = 0x442, | |
47 | [PCH2_ID] = 0x444, | |
48 | [PCH0_ID] = 0x446, | |
49 | [PCH1_ID] = 0x448, | |
50 | [PCHG_ID] = 0x44a, | |
51 | [PCHD_ID] = 0x44c, | |
52 | [CAPS_0] = 0x44e, | |
53 | [CAPS_1] = 0x452, | |
54 | [CAPS_2] = 0x456, | |
55 | [CAPS_3] = 0x458, | |
56 | [CAPS_4] = 0x45a, | |
57 | [PCH2_SR] = 0x460, | |
58 | [PCH0_SR] = 0x480, | |
59 | [PCH1_SR] = 0x482, | |
60 | [PCHD_SR] = 0x4c0, | |
61 | ||
62 | /* Common Registers */ | |
63 | [CSDP] = 0x00, | |
64 | [CCR] = 0x02, | |
65 | [CICR] = 0x04, | |
66 | [CSR] = 0x06, | |
67 | [CEN] = 0x10, | |
68 | [CFN] = 0x12, | |
69 | [CSFI] = 0x14, | |
70 | [CSEI] = 0x16, | |
71 | [CPC] = 0x18, /* 15xx only */ | |
72 | [CSAC] = 0x18, | |
73 | [CDAC] = 0x1a, | |
74 | [CDEI] = 0x1c, | |
75 | [CDFI] = 0x1e, | |
76 | [CLNK_CTRL] = 0x28, | |
77 | ||
78 | /* Channel specific register offsets */ | |
79 | [CSSA] = 0x08, | |
80 | [CDSA] = 0x0c, | |
81 | [COLOR] = 0x20, | |
82 | [CCR2] = 0x24, | |
83 | [LCH_CTRL] = 0x2a, | |
84 | }; | |
6568f7c4 MK |
85 | |
86 | static struct resource res[] __initdata = { | |
87 | [0] = { | |
88 | .start = OMAP1_DMA_BASE, | |
89 | .end = OMAP1_DMA_BASE + SZ_2K - 1, | |
90 | .flags = IORESOURCE_MEM, | |
91 | }, | |
92 | [1] = { | |
93 | .name = "0", | |
94 | .start = INT_DMA_CH0_6, | |
95 | .flags = IORESOURCE_IRQ, | |
96 | }, | |
97 | [2] = { | |
98 | .name = "1", | |
99 | .start = INT_DMA_CH1_7, | |
100 | .flags = IORESOURCE_IRQ, | |
101 | }, | |
102 | [3] = { | |
103 | .name = "2", | |
104 | .start = INT_DMA_CH2_8, | |
105 | .flags = IORESOURCE_IRQ, | |
106 | }, | |
107 | [4] = { | |
108 | .name = "3", | |
109 | .start = INT_DMA_CH3, | |
110 | .flags = IORESOURCE_IRQ, | |
111 | }, | |
112 | [5] = { | |
113 | .name = "4", | |
114 | .start = INT_DMA_CH4, | |
115 | .flags = IORESOURCE_IRQ, | |
116 | }, | |
117 | [6] = { | |
118 | .name = "5", | |
119 | .start = INT_DMA_CH5, | |
120 | .flags = IORESOURCE_IRQ, | |
121 | }, | |
f31cc962 | 122 | /* Handled in lcd_dma.c */ |
6568f7c4 MK |
123 | [7] = { |
124 | .name = "6", | |
125 | .start = INT_1610_DMA_CH6, | |
126 | .flags = IORESOURCE_IRQ, | |
127 | }, | |
128 | /* irq's for omap16xx and omap7xx */ | |
129 | [8] = { | |
130 | .name = "7", | |
131 | .start = INT_1610_DMA_CH7, | |
132 | .flags = IORESOURCE_IRQ, | |
133 | }, | |
134 | [9] = { | |
135 | .name = "8", | |
136 | .start = INT_1610_DMA_CH8, | |
137 | .flags = IORESOURCE_IRQ, | |
138 | }, | |
139 | [10] = { | |
140 | .name = "9", | |
141 | .start = INT_1610_DMA_CH9, | |
142 | .flags = IORESOURCE_IRQ, | |
143 | }, | |
144 | [11] = { | |
145 | .name = "10", | |
146 | .start = INT_1610_DMA_CH10, | |
147 | .flags = IORESOURCE_IRQ, | |
148 | }, | |
149 | [12] = { | |
150 | .name = "11", | |
151 | .start = INT_1610_DMA_CH11, | |
152 | .flags = IORESOURCE_IRQ, | |
153 | }, | |
154 | [13] = { | |
155 | .name = "12", | |
156 | .start = INT_1610_DMA_CH12, | |
157 | .flags = IORESOURCE_IRQ, | |
158 | }, | |
159 | [14] = { | |
160 | .name = "13", | |
161 | .start = INT_1610_DMA_CH13, | |
162 | .flags = IORESOURCE_IRQ, | |
163 | }, | |
164 | [15] = { | |
165 | .name = "14", | |
166 | .start = INT_1610_DMA_CH14, | |
167 | .flags = IORESOURCE_IRQ, | |
168 | }, | |
169 | [16] = { | |
170 | .name = "15", | |
171 | .start = INT_1610_DMA_CH15, | |
172 | .flags = IORESOURCE_IRQ, | |
173 | }, | |
174 | [17] = { | |
175 | .name = "16", | |
176 | .start = INT_DMA_LCD, | |
177 | .flags = IORESOURCE_IRQ, | |
178 | }, | |
179 | }; | |
180 | ||
f31cc962 MK |
181 | static void __iomem *dma_base; |
182 | static inline void dma_write(u32 val, int reg, int lch) | |
183 | { | |
184 | u8 stride; | |
185 | u32 offset; | |
186 | ||
187 | stride = (reg >= dma_common_ch_start) ? dma_stride : 0; | |
188 | offset = reg_map[reg] + (stride * lch); | |
189 | ||
190 | __raw_writew(val, dma_base + offset); | |
191 | if ((reg > CLNK_CTRL && reg < CCEN) || | |
192 | (reg > PCHD_ID && reg < CAPS_2)) { | |
193 | u32 offset2 = reg_map[reg] + 2 + (stride * lch); | |
194 | __raw_writew(val >> 16, dma_base + offset2); | |
195 | } | |
196 | } | |
197 | ||
198 | static inline u32 dma_read(int reg, int lch) | |
199 | { | |
200 | u8 stride; | |
201 | u32 offset, val; | |
202 | ||
203 | stride = (reg >= dma_common_ch_start) ? dma_stride : 0; | |
204 | offset = reg_map[reg] + (stride * lch); | |
205 | ||
206 | val = __raw_readw(dma_base + offset); | |
207 | if ((reg > CLNK_CTRL && reg < CCEN) || | |
208 | (reg > PCHD_ID && reg < CAPS_2)) { | |
209 | u16 upper; | |
210 | u32 offset2 = reg_map[reg] + 2 + (stride * lch); | |
211 | upper = __raw_readw(dma_base + offset2); | |
212 | val |= (upper << 16); | |
213 | } | |
214 | return val; | |
215 | } | |
216 | ||
217 | static void omap1_clear_lch_regs(int lch) | |
218 | { | |
219 | int i = dma_common_ch_start; | |
220 | ||
221 | for (; i <= dma_common_ch_end; i += 1) | |
222 | dma_write(0, i, lch); | |
223 | } | |
224 | ||
225 | static void omap1_clear_dma(int lch) | |
226 | { | |
227 | u32 l; | |
228 | ||
229 | l = dma_read(CCR, lch); | |
230 | l &= ~OMAP_DMA_CCR_EN; | |
231 | dma_write(l, CCR, lch); | |
232 | ||
233 | /* Clear pending interrupts */ | |
234 | l = dma_read(CSR, lch); | |
235 | } | |
236 | ||
237 | static void omap1_show_dma_caps(void) | |
238 | { | |
239 | if (enable_1510_mode) { | |
240 | printk(KERN_INFO "DMA support for OMAP15xx initialized\n"); | |
241 | } else { | |
242 | u16 w; | |
243 | printk(KERN_INFO "OMAP DMA hardware version %d\n", | |
244 | dma_read(HW_ID, 0)); | |
245 | printk(KERN_INFO "DMA capabilities: %08x:%08x:%04x:%04x:%04x\n", | |
246 | dma_read(CAPS_0, 0), dma_read(CAPS_1, 0), | |
247 | dma_read(CAPS_2, 0), dma_read(CAPS_3, 0), | |
248 | dma_read(CAPS_4, 0)); | |
249 | ||
250 | /* Disable OMAP 3.0/3.1 compatibility mode. */ | |
251 | w = dma_read(GSCR, 0); | |
252 | w |= 1 << 3; | |
253 | dma_write(w, GSCR, 0); | |
254 | } | |
255 | return; | |
256 | } | |
257 | ||
258 | static u32 configure_dma_errata(void) | |
259 | { | |
260 | ||
261 | /* | |
262 | * Erratum 3.2/3.3: sometimes 0 is returned if CSAC/CDAC is | |
263 | * read before the DMA controller finished disabling the channel. | |
264 | */ | |
265 | if (!cpu_is_omap15xx()) | |
266 | SET_DMA_ERRATA(DMA_ERRATA_3_3); | |
267 | ||
268 | return errata; | |
269 | } | |
270 | ||
6568f7c4 MK |
271 | static int __init omap1_system_dma_init(void) |
272 | { | |
273 | struct omap_system_dma_plat_info *p; | |
f31cc962 | 274 | struct omap_dma_dev_attr *d; |
6568f7c4 MK |
275 | struct platform_device *pdev; |
276 | int ret; | |
277 | ||
278 | pdev = platform_device_alloc("omap_dma_system", 0); | |
279 | if (!pdev) { | |
280 | pr_err("%s: Unable to device alloc for dma\n", | |
281 | __func__); | |
282 | return -ENOMEM; | |
283 | } | |
284 | ||
f31cc962 MK |
285 | dma_base = ioremap(res[0].start, resource_size(&res[0])); |
286 | if (!dma_base) { | |
287 | pr_err("%s: Unable to ioremap\n", __func__); | |
77f7059a JL |
288 | ret = -ENODEV; |
289 | goto exit_device_put; | |
f31cc962 MK |
290 | } |
291 | ||
6568f7c4 MK |
292 | ret = platform_device_add_resources(pdev, res, ARRAY_SIZE(res)); |
293 | if (ret) { | |
294 | dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n", | |
295 | __func__, pdev->name, pdev->id); | |
77f7059a | 296 | goto exit_device_put; |
6568f7c4 MK |
297 | } |
298 | ||
299 | p = kzalloc(sizeof(struct omap_system_dma_plat_info), GFP_KERNEL); | |
300 | if (!p) { | |
301 | dev_err(&pdev->dev, "%s: Unable to allocate 'p' for %s\n", | |
302 | __func__, pdev->name); | |
303 | ret = -ENOMEM; | |
77f7059a | 304 | goto exit_device_del; |
6568f7c4 MK |
305 | } |
306 | ||
f31cc962 MK |
307 | d = kzalloc(sizeof(struct omap_dma_dev_attr), GFP_KERNEL); |
308 | if (!d) { | |
309 | dev_err(&pdev->dev, "%s: Unable to allocate 'd' for %s\n", | |
310 | __func__, pdev->name); | |
311 | ret = -ENOMEM; | |
312 | goto exit_release_p; | |
313 | } | |
314 | ||
315 | d->lch_count = OMAP1_LOGICAL_DMA_CH_COUNT; | |
316 | ||
317 | /* Valid attributes for omap1 plus processors */ | |
318 | if (cpu_is_omap15xx()) | |
319 | d->dev_caps = ENABLE_1510_MODE; | |
320 | enable_1510_mode = d->dev_caps & ENABLE_1510_MODE; | |
321 | ||
322 | d->dev_caps |= SRC_PORT; | |
323 | d->dev_caps |= DST_PORT; | |
324 | d->dev_caps |= SRC_INDEX; | |
325 | d->dev_caps |= DST_INDEX; | |
326 | d->dev_caps |= IS_BURST_ONLY4; | |
327 | d->dev_caps |= CLEAR_CSR_ON_READ; | |
328 | d->dev_caps |= IS_WORD_16; | |
329 | ||
330 | ||
331 | d->chan = kzalloc(sizeof(struct omap_dma_lch) * | |
332 | (d->lch_count), GFP_KERNEL); | |
333 | if (!d->chan) { | |
7852ec05 PW |
334 | dev_err(&pdev->dev, |
335 | "%s: Memory allocation failed for d->chan!\n", | |
336 | __func__); | |
f31cc962 MK |
337 | goto exit_release_d; |
338 | } | |
339 | ||
340 | if (cpu_is_omap15xx()) | |
341 | d->chan_count = 9; | |
342 | else if (cpu_is_omap16xx() || cpu_is_omap7xx()) { | |
343 | if (!(d->dev_caps & ENABLE_1510_MODE)) | |
344 | d->chan_count = 16; | |
345 | else | |
346 | d->chan_count = 9; | |
347 | } | |
348 | ||
349 | p->dma_attr = d; | |
350 | ||
351 | p->show_dma_caps = omap1_show_dma_caps; | |
352 | p->clear_lch_regs = omap1_clear_lch_regs; | |
353 | p->clear_dma = omap1_clear_dma; | |
354 | p->dma_write = dma_write; | |
355 | p->dma_read = dma_read; | |
356 | p->disable_irq_lch = NULL; | |
357 | ||
358 | p->errata = configure_dma_errata(); | |
359 | ||
6568f7c4 MK |
360 | ret = platform_device_add_data(pdev, p, sizeof(*p)); |
361 | if (ret) { | |
362 | dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n", | |
363 | __func__, pdev->name, pdev->id); | |
f31cc962 | 364 | goto exit_release_chan; |
6568f7c4 MK |
365 | } |
366 | ||
367 | ret = platform_device_add(pdev); | |
368 | if (ret) { | |
369 | dev_err(&pdev->dev, "%s: Unable to add resources for %s%d\n", | |
370 | __func__, pdev->name, pdev->id); | |
f31cc962 | 371 | goto exit_release_chan; |
6568f7c4 MK |
372 | } |
373 | ||
f31cc962 MK |
374 | dma_stride = OMAP1_DMA_STRIDE; |
375 | dma_common_ch_start = CPC; | |
376 | dma_common_ch_end = COLOR; | |
377 | ||
6568f7c4 MK |
378 | return ret; |
379 | ||
f31cc962 MK |
380 | exit_release_chan: |
381 | kfree(d->chan); | |
382 | exit_release_d: | |
383 | kfree(d); | |
384 | exit_release_p: | |
385 | kfree(p); | |
6568f7c4 MK |
386 | exit_device_del: |
387 | platform_device_del(pdev); | |
77f7059a JL |
388 | exit_device_put: |
389 | platform_device_put(pdev); | |
6568f7c4 MK |
390 | |
391 | return ret; | |
392 | } | |
393 | arch_initcall(omap1_system_dma_init); |