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11#include <linux/err.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/ioport.h>
15#include <linux/io.h>
16#include <linux/bitops.h>
17#include <linux/mutex.h>
18#include <linux/platform_device.h>
19
20#include <video/omapvrfb.h>
21
22#ifdef DEBUG
23#define DBG(format, ...) pr_debug("VRFB: " format, ## __VA_ARGS__)
24#else
25#define DBG(format, ...)
26#endif
27
28#define SMS_ROT_CONTROL(context) (0x0 + 0x10 * context)
29#define SMS_ROT_SIZE(context) (0x4 + 0x10 * context)
30#define SMS_ROT_PHYSICAL_BA(context) (0x8 + 0x10 * context)
31#define SMS_ROT_VIRT_BASE(rot) (0x1000000 * (rot))
32
33#define OMAP_VRFB_SIZE (2048 * 2048 * 4)
34
35#define VRFB_PAGE_WIDTH_EXP 5
36#define VRFB_PAGE_HEIGHT_EXP 5
37#define VRFB_PAGE_WIDTH (1 << VRFB_PAGE_WIDTH_EXP)
38#define VRFB_PAGE_HEIGHT (1 << VRFB_PAGE_HEIGHT_EXP)
39#define SMS_IMAGEHEIGHT_OFFSET 16
40#define SMS_IMAGEWIDTH_OFFSET 0
41#define SMS_PH_OFFSET 8
42#define SMS_PW_OFFSET 4
43#define SMS_PS_OFFSET 0
44
45
46static unsigned long ctx_map;
47
48struct vrfb_ctx {
49 u32 base;
50 u32 physical_ba;
51 u32 control;
52 u32 size;
53};
54
55static DEFINE_MUTEX(ctx_lock);
56
57
58
59
60
61
62
63
64static void __iomem *vrfb_base;
65
66static int num_ctxs;
67static struct vrfb_ctx *ctxs;
68
69static bool vrfb_loaded;
70
71static void omap2_sms_write_rot_control(u32 val, unsigned ctx)
72{
73 __raw_writel(val, vrfb_base + SMS_ROT_CONTROL(ctx));
74}
75
76static void omap2_sms_write_rot_size(u32 val, unsigned ctx)
77{
78 __raw_writel(val, vrfb_base + SMS_ROT_SIZE(ctx));
79}
80
81static void omap2_sms_write_rot_physical_ba(u32 val, unsigned ctx)
82{
83 __raw_writel(val, vrfb_base + SMS_ROT_PHYSICAL_BA(ctx));
84}
85
86static inline void restore_hw_context(int ctx)
87{
88 omap2_sms_write_rot_control(ctxs[ctx].control, ctx);
89 omap2_sms_write_rot_size(ctxs[ctx].size, ctx);
90 omap2_sms_write_rot_physical_ba(ctxs[ctx].physical_ba, ctx);
91}
92
93static u32 get_image_width_roundup(u16 width, u8 bytespp)
94{
95 unsigned long stride = width * bytespp;
96 unsigned long ceil_pages_per_stride = (stride / VRFB_PAGE_WIDTH) +
97 (stride % VRFB_PAGE_WIDTH != 0);
98
99 return ceil_pages_per_stride * VRFB_PAGE_WIDTH / bytespp;
100}
101
102
103
104
105
106
107static inline u32 get_extra_physical_size(u16 image_width_roundup, u8 bytespp)
108{
109 return (OMAP_VRFB_LINE_LEN - image_width_roundup) * VRFB_PAGE_HEIGHT *
110 bytespp;
111}
112
113void omap_vrfb_restore_context(void)
114{
115 int i;
116 unsigned long map = ctx_map;
117
118 for (i = ffs(map); i; i = ffs(map)) {
119
120 i--;
121 map &= ~(1 << i);
122 restore_hw_context(i);
123 }
124}
125
126void omap_vrfb_adjust_size(u16 *width, u16 *height,
127 u8 bytespp)
128{
129 *width = ALIGN(*width * bytespp, VRFB_PAGE_WIDTH) / bytespp;
130 *height = ALIGN(*height, VRFB_PAGE_HEIGHT);
131}
132EXPORT_SYMBOL(omap_vrfb_adjust_size);
133
134u32 omap_vrfb_min_phys_size(u16 width, u16 height, u8 bytespp)
135{
136 unsigned long image_width_roundup = get_image_width_roundup(width,
137 bytespp);
138
139 if (image_width_roundup > OMAP_VRFB_LINE_LEN)
140 return 0;
141
142 return (width * height * bytespp) + get_extra_physical_size(
143 image_width_roundup, bytespp);
144}
145EXPORT_SYMBOL(omap_vrfb_min_phys_size);
146
147u16 omap_vrfb_max_height(u32 phys_size, u16 width, u8 bytespp)
148{
149 unsigned long image_width_roundup = get_image_width_roundup(width,
150 bytespp);
151 unsigned long height;
152 unsigned long extra;
153
154 if (image_width_roundup > OMAP_VRFB_LINE_LEN)
155 return 0;
156
157 extra = get_extra_physical_size(image_width_roundup, bytespp);
158
159 if (phys_size < extra)
160 return 0;
161
162 height = (phys_size - extra) / (width * bytespp);
163
164
165 return min_t(unsigned long, height, 2048);
166}
167EXPORT_SYMBOL(omap_vrfb_max_height);
168
169void omap_vrfb_setup(struct vrfb *vrfb, unsigned long paddr,
170 u16 width, u16 height,
171 unsigned bytespp, bool yuv_mode)
172{
173 unsigned pixel_size_exp;
174 u16 vrfb_width;
175 u16 vrfb_height;
176 u8 ctx = vrfb->context;
177 u32 size;
178 u32 control;
179
180 DBG("omapfb_set_vrfb(%d, %lx, %dx%d, %d, %d)\n", ctx, paddr,
181 width, height, bytespp, yuv_mode);
182
183
184
185 if (yuv_mode) {
186 bytespp *= 2;
187 width /= 2;
188 }
189
190 if (bytespp == 4)
191 pixel_size_exp = 2;
192 else if (bytespp == 2)
193 pixel_size_exp = 1;
194 else {
195 BUG();
196 return;
197 }
198
199 vrfb_width = ALIGN(width * bytespp, VRFB_PAGE_WIDTH) / bytespp;
200 vrfb_height = ALIGN(height, VRFB_PAGE_HEIGHT);
201
202 DBG("vrfb w %u, h %u bytespp %d\n", vrfb_width, vrfb_height, bytespp);
203
204 size = vrfb_width << SMS_IMAGEWIDTH_OFFSET;
205 size |= vrfb_height << SMS_IMAGEHEIGHT_OFFSET;
206
207 control = pixel_size_exp << SMS_PS_OFFSET;
208 control |= VRFB_PAGE_WIDTH_EXP << SMS_PW_OFFSET;
209 control |= VRFB_PAGE_HEIGHT_EXP << SMS_PH_OFFSET;
210
211 ctxs[ctx].physical_ba = paddr;
212 ctxs[ctx].size = size;
213 ctxs[ctx].control = control;
214
215 omap2_sms_write_rot_physical_ba(paddr, ctx);
216 omap2_sms_write_rot_size(size, ctx);
217 omap2_sms_write_rot_control(control, ctx);
218
219 DBG("vrfb offset pixels %d, %d\n",
220 vrfb_width - width, vrfb_height - height);
221
222 vrfb->xres = width;
223 vrfb->yres = height;
224 vrfb->xoffset = vrfb_width - width;
225 vrfb->yoffset = vrfb_height - height;
226 vrfb->bytespp = bytespp;
227 vrfb->yuv_mode = yuv_mode;
228}
229EXPORT_SYMBOL(omap_vrfb_setup);
230
231int omap_vrfb_map_angle(struct vrfb *vrfb, u16 height, u8 rot)
232{
233 unsigned long size = height * OMAP_VRFB_LINE_LEN * vrfb->bytespp;
234
235 vrfb->vaddr[rot] = ioremap_wc(vrfb->paddr[rot], size);
236
237 if (!vrfb->vaddr[rot]) {
238 printk(KERN_ERR "vrfb: ioremap failed\n");
239 return -ENOMEM;
240 }
241
242 DBG("ioremapped vrfb area %d of size %lu into %p\n", rot, size,
243 vrfb->vaddr[rot]);
244
245 return 0;
246}
247EXPORT_SYMBOL(omap_vrfb_map_angle);
248
249void omap_vrfb_release_ctx(struct vrfb *vrfb)
250{
251 int rot;
252 int ctx = vrfb->context;
253
254 if (ctx == 0xff)
255 return;
256
257 DBG("release ctx %d\n", ctx);
258
259 mutex_lock(&ctx_lock);
260
261 BUG_ON(!(ctx_map & (1 << ctx)));
262
263 clear_bit(ctx, &ctx_map);
264
265 for (rot = 0; rot < 4; ++rot) {
266 if (vrfb->paddr[rot]) {
267 release_mem_region(vrfb->paddr[rot], OMAP_VRFB_SIZE);
268 vrfb->paddr[rot] = 0;
269 }
270 }
271
272 vrfb->context = 0xff;
273
274 mutex_unlock(&ctx_lock);
275}
276EXPORT_SYMBOL(omap_vrfb_release_ctx);
277
278int omap_vrfb_request_ctx(struct vrfb *vrfb)
279{
280 int rot;
281 u32 paddr;
282 u8 ctx;
283 int r;
284
285 DBG("request ctx\n");
286
287 mutex_lock(&ctx_lock);
288
289 for (ctx = 0; ctx < num_ctxs; ++ctx)
290 if ((ctx_map & (1 << ctx)) == 0)
291 break;
292
293 if (ctx == num_ctxs) {
294 pr_err("vrfb: no free contexts\n");
295 r = -EBUSY;
296 goto out;
297 }
298
299 DBG("found free ctx %d\n", ctx);
300
301 set_bit(ctx, &ctx_map);
302
303 memset(vrfb, 0, sizeof(*vrfb));
304
305 vrfb->context = ctx;
306
307 for (rot = 0; rot < 4; ++rot) {
308 paddr = ctxs[ctx].base + SMS_ROT_VIRT_BASE(rot);
309 if (!request_mem_region(paddr, OMAP_VRFB_SIZE, "vrfb")) {
310 pr_err("vrfb: failed to reserve VRFB "
311 "area for ctx %d, rotation %d\n",
312 ctx, rot * 90);
313 omap_vrfb_release_ctx(vrfb);
314 r = -ENOMEM;
315 goto out;
316 }
317
318 vrfb->paddr[rot] = paddr;
319
320 DBG("VRFB %d/%d: %lx\n", ctx, rot*90, vrfb->paddr[rot]);
321 }
322
323 r = 0;
324out:
325 mutex_unlock(&ctx_lock);
326 return r;
327}
328EXPORT_SYMBOL(omap_vrfb_request_ctx);
329
330bool omap_vrfb_supported(void)
331{
332 return vrfb_loaded;
333}
334EXPORT_SYMBOL(omap_vrfb_supported);
335
336static int __init vrfb_probe(struct platform_device *pdev)
337{
338 struct resource *mem;
339 int i;
340
341
342 vrfb_base = devm_platform_ioremap_resource(pdev, 0);
343 if (IS_ERR(vrfb_base))
344 return PTR_ERR(vrfb_base);
345
346 num_ctxs = pdev->num_resources - 1;
347
348 ctxs = devm_kcalloc(&pdev->dev,
349 num_ctxs, sizeof(struct vrfb_ctx),
350 GFP_KERNEL);
351
352 if (!ctxs)
353 return -ENOMEM;
354
355 for (i = 0; i < num_ctxs; ++i) {
356 mem = platform_get_resource(pdev, IORESOURCE_MEM, 1 + i);
357 if (!mem) {
358 dev_err(&pdev->dev, "can't get vrfb ctx %d address\n",
359 i);
360 return -EINVAL;
361 }
362
363 ctxs[i].base = mem->start;
364 }
365
366 vrfb_loaded = true;
367
368 return 0;
369}
370
371static void __exit vrfb_remove(struct platform_device *pdev)
372{
373 vrfb_loaded = false;
374}
375
376static struct platform_driver vrfb_driver = {
377 .driver.name = "omapvrfb",
378 .remove = __exit_p(vrfb_remove),
379};
380
381module_platform_driver_probe(vrfb_driver, vrfb_probe);
382
383MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
384MODULE_DESCRIPTION("OMAP VRFB");
385MODULE_LICENSE("GPL v2");
386
