1/* 2 * VRFB Rotation Engine 3 * 4 * Copyright (C) 2009 Nokia Corporation 5 * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but 12 * WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License along 17 * with this program; if not, write to the Free Software Foundation, Inc., 18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 19 */ 20 21/*#define DEBUG*/ 22 23#include <linux/kernel.h> 24#include <linux/module.h> 25#include <linux/ioport.h> 26#include <linux/io.h> 27#include <linux/bitops.h> 28#include <linux/mutex.h> 29 30#include <plat/vrfb.h> 31#include <plat/sdrc.h> 32 33#ifdef DEBUG 34#define DBG(format, ...) pr_debug("VRFB: " format, ## __VA_ARGS__) 35#else 36#define DBG(format, ...) 37#endif 38 39#define SMS_ROT_VIRT_BASE(context, rot) \ 40 (((context >= 4) ? 0xD0000000 : 0x70000000) \ 41 + (0x4000000 * (context)) \ 42 + (0x1000000 * (rot))) 43 44#define OMAP_VRFB_SIZE (2048 * 2048 * 4) 45 46#define VRFB_PAGE_WIDTH_EXP 5 /* Assuming SDRAM pagesize= 1024 */ 47#define VRFB_PAGE_HEIGHT_EXP 5 /* 1024 = 2^5 * 2^5 */ 48#define VRFB_PAGE_WIDTH (1 << VRFB_PAGE_WIDTH_EXP) 49#define VRFB_PAGE_HEIGHT (1 << VRFB_PAGE_HEIGHT_EXP) 50#define SMS_IMAGEHEIGHT_OFFSET 16 51#define SMS_IMAGEWIDTH_OFFSET 0 52#define SMS_PH_OFFSET 8 53#define SMS_PW_OFFSET 4 54#define SMS_PS_OFFSET 0 55 56#define VRFB_NUM_CTXS 12 57/* bitmap of reserved contexts */ 58static unsigned long ctx_map; 59 60static DEFINE_MUTEX(ctx_lock); 61 62/* 63 * Access to this happens from client drivers or the PM core after wake-up. 64 * For the first case we require locking at the driver level, for the second 65 * we don't need locking, since no drivers will run until after the wake-up 66 * has finished. 67 */ 68static struct { 69 u32 physical_ba; 70 u32 control; 71 u32 size; 72} vrfb_hw_context[VRFB_NUM_CTXS]; 73 74static inline void restore_hw_context(int ctx) 75{ 76 omap2_sms_write_rot_control(vrfb_hw_context[ctx].control, ctx); 77 omap2_sms_write_rot_size(vrfb_hw_context[ctx].size, ctx); 78 omap2_sms_write_rot_physical_ba(vrfb_hw_context[ctx].physical_ba, ctx); 79} 80 81static u32 get_image_width_roundup(u16 width, u8 bytespp) 82{ 83 unsigned long stride = width * bytespp; 84 unsigned long ceil_pages_per_stride = (stride / VRFB_PAGE_WIDTH) + 85 (stride % VRFB_PAGE_WIDTH != 0); 86 87 return ceil_pages_per_stride * VRFB_PAGE_WIDTH / bytespp; 88} 89 90/* 91 * This the extra space needed in the VRFB physical area for VRFB to safely wrap 92 * any memory accesses to the invisible part of the virtual view to the physical 93 * area. 94 */ 95static inline u32 get_extra_physical_size(u16 image_width_roundup, u8 bytespp) 96{ 97 return (OMAP_VRFB_LINE_LEN - image_width_roundup) * VRFB_PAGE_HEIGHT * 98 bytespp; 99} 100 101void omap_vrfb_restore_context(void) 102{ 103 int i; 104 unsigned long map = ctx_map; 105 106 for (i = ffs(map); i; i = ffs(map)) { 107 /* i=1..32 */ 108 i--; 109 map &= ~(1 << i); 110 restore_hw_context(i); 111 } 112} 113 114void omap_vrfb_adjust_size(u16 *width, u16 *height, 115 u8 bytespp) 116{ 117 *width = ALIGN(*width * bytespp, VRFB_PAGE_WIDTH) / bytespp; 118 *height = ALIGN(*height, VRFB_PAGE_HEIGHT); 119} 120EXPORT_SYMBOL(omap_vrfb_adjust_size); 121 122u32 omap_vrfb_min_phys_size(u16 width, u16 height, u8 bytespp) 123{ 124 unsigned long image_width_roundup = get_image_width_roundup(width, 125 bytespp); 126 127 if (image_width_roundup > OMAP_VRFB_LINE_LEN) 128 return 0; 129 130 return (width * height * bytespp) + get_extra_physical_size( 131 image_width_roundup, bytespp); 132} 133EXPORT_SYMBOL(omap_vrfb_min_phys_size); 134 135u16 omap_vrfb_max_height(u32 phys_size, u16 width, u8 bytespp) 136{ 137 unsigned long image_width_roundup = get_image_width_roundup(width, 138 bytespp); 139 unsigned long height; 140 unsigned long extra; 141 142 if (image_width_roundup > OMAP_VRFB_LINE_LEN) 143 return 0; 144 145 extra = get_extra_physical_size(image_width_roundup, bytespp); 146 147 if (phys_size < extra) 148 return 0; 149 150 height = (phys_size - extra) / (width * bytespp); 151 152 /* Virtual views provided by VRFB are limited to 2048x2048. */ 153 return min_t(unsigned long, height, 2048); 154} 155EXPORT_SYMBOL(omap_vrfb_max_height); 156 157void omap_vrfb_setup(struct vrfb *vrfb, unsigned long paddr, 158 u16 width, u16 height, 159 unsigned bytespp, bool yuv_mode) 160{ 161 unsigned pixel_size_exp; 162 u16 vrfb_width; 163 u16 vrfb_height; 164 u8 ctx = vrfb->context; 165 u32 size; 166 u32 control; 167 168 DBG("omapfb_set_vrfb(%d, %lx, %dx%d, %d, %d)\n", ctx, paddr, 169 width, height, bytespp, yuv_mode); 170 171 /* For YUV2 and UYVY modes VRFB needs to handle pixels a bit 172 * differently. See TRM. */ 173 if (yuv_mode) { 174 bytespp *= 2; 175 width /= 2; 176 } 177 178 if (bytespp == 4) 179 pixel_size_exp = 2; 180 else if (bytespp == 2) 181 pixel_size_exp = 1; 182 else 183 BUG(); 184 185 vrfb_width = ALIGN(width * bytespp, VRFB_PAGE_WIDTH) / bytespp; 186 vrfb_height = ALIGN(height, VRFB_PAGE_HEIGHT); 187 188 DBG("vrfb w %u, h %u bytespp %d\n", vrfb_width, vrfb_height, bytespp); 189 190 size = vrfb_width << SMS_IMAGEWIDTH_OFFSET; 191 size |= vrfb_height << SMS_IMAGEHEIGHT_OFFSET; 192 193 control = pixel_size_exp << SMS_PS_OFFSET; 194 control |= VRFB_PAGE_WIDTH_EXP << SMS_PW_OFFSET; 195 control |= VRFB_PAGE_HEIGHT_EXP << SMS_PH_OFFSET; 196 197 vrfb_hw_context[ctx].physical_ba = paddr; 198 vrfb_hw_context[ctx].size = size; 199 vrfb_hw_context[ctx].control = control; 200 201 omap2_sms_write_rot_physical_ba(paddr, ctx); 202 omap2_sms_write_rot_size(size, ctx); 203 omap2_sms_write_rot_control(control, ctx); 204 205 DBG("vrfb offset pixels %d, %d\n", 206 vrfb_width - width, vrfb_height - height); 207 208 vrfb->xres = width; 209 vrfb->yres = height; 210 vrfb->xoffset = vrfb_width - width; 211 vrfb->yoffset = vrfb_height - height; 212 vrfb->bytespp = bytespp; 213 vrfb->yuv_mode = yuv_mode; 214} 215EXPORT_SYMBOL(omap_vrfb_setup); 216 217int omap_vrfb_map_angle(struct vrfb *vrfb, u16 height, u8 rot) 218{ 219 unsigned long size = height * OMAP_VRFB_LINE_LEN * vrfb->bytespp; 220 221 vrfb->vaddr[rot] = ioremap_wc(vrfb->paddr[rot], size); 222 223 if (!vrfb->vaddr[rot]) { 224 printk(KERN_ERR "vrfb: ioremap failed\n"); 225 return -ENOMEM; 226 } 227 228 DBG("ioremapped vrfb area %d of size %lu into %p\n", rot, size, 229 vrfb->vaddr[rot]); 230 231 return 0; 232} 233EXPORT_SYMBOL(omap_vrfb_map_angle); 234 235void omap_vrfb_release_ctx(struct vrfb *vrfb) 236{ 237 int rot; 238 int ctx = vrfb->context; 239 240 if (ctx == 0xff) 241 return; 242 243 DBG("release ctx %d\n", ctx); 244 245 mutex_lock(&ctx_lock); 246 247 BUG_ON(!(ctx_map & (1 << ctx))); 248 249 clear_bit(ctx, &ctx_map); 250 251 for (rot = 0; rot < 4; ++rot) { 252 if (vrfb->paddr[rot]) { 253 release_mem_region(vrfb->paddr[rot], OMAP_VRFB_SIZE); 254 vrfb->paddr[rot] = 0; 255 } 256 } 257 258 vrfb->context = 0xff; 259 260 mutex_unlock(&ctx_lock); 261} 262EXPORT_SYMBOL(omap_vrfb_release_ctx); 263 264int omap_vrfb_request_ctx(struct vrfb *vrfb) 265{ 266 int rot; 267 u32 paddr; 268 u8 ctx; 269 int r; 270 271 DBG("request ctx\n"); 272 273 mutex_lock(&ctx_lock); 274 275 for (ctx = 0; ctx < VRFB_NUM_CTXS; ++ctx) 276 if ((ctx_map & (1 << ctx)) == 0) 277 break; 278 279 if (ctx == VRFB_NUM_CTXS) { 280 pr_err("vrfb: no free contexts\n"); 281 r = -EBUSY; 282 goto out; 283 } 284 285 DBG("found free ctx %d\n", ctx); 286 287 set_bit(ctx, &ctx_map); 288 289 memset(vrfb, 0, sizeof(*vrfb)); 290 291 vrfb->context = ctx; 292 293 for (rot = 0; rot < 4; ++rot) { 294 paddr = SMS_ROT_VIRT_BASE(ctx, rot); 295 if (!request_mem_region(paddr, OMAP_VRFB_SIZE, "vrfb")) { 296 pr_err("vrfb: failed to reserve VRFB " 297 "area for ctx %d, rotation %d\n", 298 ctx, rot * 90); 299 omap_vrfb_release_ctx(vrfb); 300 r = -ENOMEM; 301 goto out; 302 } 303 304 vrfb->paddr[rot] = paddr; 305 306 DBG("VRFB %d/%d: %lx\n", ctx, rot*90, vrfb->paddr[rot]); 307 } 308 309 r = 0; 310out: 311 mutex_unlock(&ctx_lock); 312 return r; 313} 314EXPORT_SYMBOL(omap_vrfb_request_ctx); 315