/* * VRFB Rotation Engine * * Copyright (C) 2009 Nokia Corporation * Author: Tomi Valkeinen <tomi.valkeinen@nokia.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. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /*#define DEBUG*/ #include <linux/kernel.h> #include <linux/module.h> #include <linux/ioport.h> #include <linux/io.h> #include <linux/bitops.h> #include <linux/mutex.h> #include <plat/vrfb.h> #include <plat/sdrc.h> #ifdef DEBUG #define DBG(format, ...) pr_debug("VRFB: " format, ## __VA_ARGS__) #else #define DBG(format, ...) #endif #define SMS_ROT_VIRT_BASE(context, rot) \ (((context >= 4) ? 0xD0000000 : 0x70000000) \ + (0x4000000 * (context)) \ + (0x1000000 * (rot))) #define OMAP_VRFB_SIZE (2048 * 2048 * 4) #define VRFB_PAGE_WIDTH_EXP 5 /* Assuming SDRAM pagesize= 1024 */ #define VRFB_PAGE_HEIGHT_EXP 5 /* 1024 = 2^5 * 2^5 */ #define VRFB_PAGE_WIDTH (1 << VRFB_PAGE_WIDTH_EXP) #define VRFB_PAGE_HEIGHT (1 << VRFB_PAGE_HEIGHT_EXP) #define SMS_IMAGEHEIGHT_OFFSET 16 #define SMS_IMAGEWIDTH_OFFSET 0 #define SMS_PH_OFFSET 8 #define SMS_PW_OFFSET 4 #define SMS_PS_OFFSET 0 #define VRFB_NUM_CTXS 12 /* bitmap of reserved contexts */ static unsigned long ctx_map; static DEFINE_MUTEX(ctx_lock); /* * Access to this happens from client drivers or the PM core after wake-up. * For the first case we require locking at the driver level, for the second * we don't need locking, since no drivers will run until after the wake-up * has finished. */ static struct { u32 physical_ba; u32 control; u32 size; } vrfb_hw_context[VRFB_NUM_CTXS]; static inline void restore_hw_context(int ctx) { omap2_sms_write_rot_control(vrfb_hw_context[ctx].control, ctx); omap2_sms_write_rot_size(vrfb_hw_context[ctx].size, ctx); omap2_sms_write_rot_physical_ba(vrfb_hw_context[ctx].physical_ba, ctx); } static u32 get_image_width_roundup(u16 width, u8 bytespp) { unsigned long stride = width * bytespp; unsigned long ceil_pages_per_stride = (stride / VRFB_PAGE_WIDTH) + (stride % VRFB_PAGE_WIDTH != 0); return ceil_pages_per_stride * VRFB_PAGE_WIDTH / bytespp; } /* * This the extra space needed in the VRFB physical area for VRFB to safely wrap * any memory accesses to the invisible part of the virtual view to the physical * area. */ static inline u32 get_extra_physical_size(u16 image_width_roundup, u8 bytespp) { return (OMAP_VRFB_LINE_LEN - image_width_roundup) * VRFB_PAGE_HEIGHT * bytespp; } void omap_vrfb_restore_context(void) { int i; unsigned long map = ctx_map; for (i = ffs(map); i; i = ffs(map)) { /* i=1..32 */ i--; map &= ~(1 << i); restore_hw_context(i); } } void omap_vrfb_adjust_size(u16 *width, u16 *height, u8 bytespp) { *width = ALIGN(*width * bytespp, VRFB_PAGE_WIDTH) / bytespp; *height = ALIGN(*height, VRFB_PAGE_HEIGHT); } EXPORT_SYMBOL(omap_vrfb_adjust_size); u32 omap_vrfb_min_phys_size(u16 width, u16 height, u8 bytespp) { unsigned long image_width_roundup = get_image_width_roundup(width, bytespp); if (image_width_roundup > OMAP_VRFB_LINE_LEN) return 0; return (width * height * bytespp) + get_extra_physical_size( image_width_roundup, bytespp); } EXPORT_SYMBOL(omap_vrfb_min_phys_size); u16 omap_vrfb_max_height(u32 phys_size, u16 width, u8 bytespp) { unsigned long image_width_roundup = get_image_width_roundup(width, bytespp); unsigned long height; unsigned long extra; if (image_width_roundup > OMAP_VRFB_LINE_LEN) return 0; extra = get_extra_physical_size(image_width_roundup, bytespp); if (phys_size < extra) return 0; height = (phys_size - extra) / (width * bytespp); /* Virtual views provided by VRFB are limited to 2048x2048. */ return min_t(unsigned long, height, 2048); } EXPORT_SYMBOL(omap_vrfb_max_height); void omap_vrfb_setup(struct vrfb *vrfb, unsigned long paddr, u16 width, u16 height, unsigned bytespp, bool yuv_mode) { unsigned pixel_size_exp; u16 vrfb_width; u16 vrfb_height; u8 ctx = vrfb->context; u32 size; u32 control; DBG("omapfb_set_vrfb(%d, %lx, %dx%d, %d, %d)\n", ctx, paddr, width, height, bytespp, yuv_mode); /* For YUV2 and UYVY modes VRFB needs to handle pixels a bit * differently. See TRM. */ if (yuv_mode) { bytespp *= 2; width /= 2; } if (bytespp == 4) pixel_size_exp = 2; else if (bytespp == 2) pixel_size_exp = 1; else { BUG(); return; } vrfb_width = ALIGN(width * bytespp, VRFB_PAGE_WIDTH) / bytespp; vrfb_height = ALIGN(height, VRFB_PAGE_HEIGHT); DBG("vrfb w %u, h %u bytespp %d\n", vrfb_width, vrfb_height, bytespp); size = vrfb_width << SMS_IMAGEWIDTH_OFFSET; size |= vrfb_height << SMS_IMAGEHEIGHT_OFFSET; control = pixel_size_exp << SMS_PS_OFFSET; control |= VRFB_PAGE_WIDTH_EXP << SMS_PW_OFFSET; control |= VRFB_PAGE_HEIGHT_EXP << SMS_PH_OFFSET; vrfb_hw_context[ctx].physical_ba = paddr; vrfb_hw_context[ctx].size = size; vrfb_hw_context[ctx].control = control; omap2_sms_write_rot_physical_ba(paddr, ctx); omap2_sms_write_rot_size(size, ctx); omap2_sms_write_rot_control(control, ctx); DBG("vrfb offset pixels %d, %d\n", vrfb_width - width, vrfb_height - height); vrfb->xres = width; vrfb->yres = height; vrfb->xoffset = vrfb_width - width; vrfb->yoffset = vrfb_height - height; vrfb->bytespp = bytespp; vrfb->yuv_mode = yuv_mode; } EXPORT_SYMBOL(omap_vrfb_setup); int omap_vrfb_map_angle(struct vrfb *vrfb, u16 height, u8 rot) { unsigned long size = height * OMAP_VRFB_LINE_LEN * vrfb->bytespp; vrfb->vaddr[rot] = ioremap_wc(vrfb->paddr[rot], size); if (!vrfb->vaddr[rot]) { printk(KERN_ERR "vrfb: ioremap failed\n"); return -ENOMEM; } DBG("ioremapped vrfb area %d of size %lu into %p\n", rot, size, vrfb->vaddr[rot]); return 0; } EXPORT_SYMBOL(omap_vrfb_map_angle); void omap_vrfb_release_ctx(struct vrfb *vrfb) { int rot; int ctx = vrfb->context; if (ctx == 0xff) return; DBG("release ctx %d\n", ctx); mutex_lock(&ctx_lock); BUG_ON(!(ctx_map & (1 << ctx))); clear_bit(ctx, &ctx_map); for (rot = 0; rot < 4; ++rot) { if (vrfb->paddr[rot]) { release_mem_region(vrfb->paddr[rot], OMAP_VRFB_SIZE); vrfb->paddr[rot] = 0; } } vrfb->context = 0xff; mutex_unlock(&ctx_lock); } EXPORT_SYMBOL(omap_vrfb_release_ctx); int omap_vrfb_request_ctx(struct vrfb *vrfb) { int rot; u32 paddr; u8 ctx; int r; DBG("request ctx\n"); mutex_lock(&ctx_lock); for (ctx = 0; ctx < VRFB_NUM_CTXS; ++ctx) if ((ctx_map & (1 << ctx)) == 0) break; if (ctx == VRFB_NUM_CTXS) { pr_err("vrfb: no free contexts\n"); r = -EBUSY; goto out; } DBG("found free ctx %d\n", ctx); set_bit(ctx, &ctx_map); memset(vrfb, 0, sizeof(*vrfb)); vrfb->context = ctx; for (rot = 0; rot < 4; ++rot) { paddr = SMS_ROT_VIRT_BASE(ctx, rot); if (!request_mem_region(paddr, OMAP_VRFB_SIZE, "vrfb")) { pr_err("vrfb: failed to reserve VRFB " "area for ctx %d, rotation %d\n", ctx, rot * 90); omap_vrfb_release_ctx(vrfb); r = -ENOMEM; goto out; } vrfb->paddr[rot] = paddr; DBG("VRFB %d/%d: %lx\n", ctx, rot*90, vrfb->paddr[rot]); } r = 0; out: mutex_unlock(&ctx_lock); return r; } EXPORT_SYMBOL(omap_vrfb_request_ctx);