OMAP: Add support for VRFB rotation engine
VRFB rotation engine is a block in OMAP2/3 that offers 12 independent contexts that can be used for framebuffer rotation. Each context has a backend area of real memory, where it stores the pixels in undisclosed format. This memory is offered to users via 4 virtual memory areas, which see the same memory area in different rotation angles (0, 90, 180 and 270 degrees). Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>
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Tomi Valkeinen
parent
afedec183e
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640f9ca5fd
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/*
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* VRFB Rotation Engine
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*
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* Copyright (C) 2009 Nokia Corporation
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* Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef __OMAP_VRFB_H__
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#define __OMAP_VRFB_H__
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#define OMAP_VRFB_LINE_LEN 2048
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struct vrfb {
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u8 context;
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void __iomem *vaddr[4];
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unsigned long paddr[4];
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u16 xres;
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u16 yres;
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u16 xoffset;
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u16 yoffset;
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u8 bytespp;
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bool yuv_mode;
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};
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extern int omap_vrfb_request_ctx(struct vrfb *vrfb);
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extern void omap_vrfb_release_ctx(struct vrfb *vrfb);
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extern void omap_vrfb_adjust_size(u16 *width, u16 *height,
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u8 bytespp);
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extern u32 omap_vrfb_min_phys_size(u16 width, u16 height, u8 bytespp);
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extern u16 omap_vrfb_max_height(u32 phys_size, u16 width, u8 bytespp);
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extern void omap_vrfb_setup(struct vrfb *vrfb, unsigned long paddr,
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u16 width, u16 height,
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unsigned bytespp, bool yuv_mode);
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extern int omap_vrfb_map_angle(struct vrfb *vrfb, u16 height, u8 rot);
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extern void omap_vrfb_restore_context(void);
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#endif /* __VRFB_H */
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@ -1,2 +1,5 @@
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config OMAP2_VRAM
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bool
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config OMAP2_VRFB
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bool
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@ -1 +1,2 @@
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obj-$(CONFIG_OMAP2_VRAM) += vram.o
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obj-$(CONFIG_OMAP2_VRFB) += vrfb.o
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@ -0,0 +1,315 @@
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/*
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* VRFB Rotation Engine
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*
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* Copyright (C) 2009 Nokia Corporation
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* Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*#define DEBUG*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/ioport.h>
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#include <linux/io.h>
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#include <linux/bitops.h>
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#include <linux/mutex.h>
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#include <mach/io.h>
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#include <plat/vrfb.h>
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#include <plat/sdrc.h>
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#ifdef DEBUG
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#define DBG(format, ...) pr_debug("VRFB: " format, ## __VA_ARGS__)
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#else
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#define DBG(format, ...)
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#endif
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#define SMS_ROT_VIRT_BASE(context, rot) \
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(((context >= 4) ? 0xD0000000 : 0x70000000) \
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+ (0x4000000 * (context)) \
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+ (0x1000000 * (rot)))
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#define OMAP_VRFB_SIZE (2048 * 2048 * 4)
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#define VRFB_PAGE_WIDTH_EXP 5 /* Assuming SDRAM pagesize= 1024 */
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#define VRFB_PAGE_HEIGHT_EXP 5 /* 1024 = 2^5 * 2^5 */
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#define VRFB_PAGE_WIDTH (1 << VRFB_PAGE_WIDTH_EXP)
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#define VRFB_PAGE_HEIGHT (1 << VRFB_PAGE_HEIGHT_EXP)
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#define SMS_IMAGEHEIGHT_OFFSET 16
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#define SMS_IMAGEWIDTH_OFFSET 0
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#define SMS_PH_OFFSET 8
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#define SMS_PW_OFFSET 4
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#define SMS_PS_OFFSET 0
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#define VRFB_NUM_CTXS 12
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/* bitmap of reserved contexts */
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static unsigned long ctx_map;
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static DEFINE_MUTEX(ctx_lock);
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/*
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* Access to this happens from client drivers or the PM core after wake-up.
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* For the first case we require locking at the driver level, for the second
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* we don't need locking, since no drivers will run until after the wake-up
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* has finished.
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*/
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static struct {
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u32 physical_ba;
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u32 control;
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u32 size;
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} vrfb_hw_context[VRFB_NUM_CTXS];
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static inline void restore_hw_context(int ctx)
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{
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omap2_sms_write_rot_control(vrfb_hw_context[ctx].control, ctx);
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omap2_sms_write_rot_size(vrfb_hw_context[ctx].size, ctx);
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omap2_sms_write_rot_physical_ba(vrfb_hw_context[ctx].physical_ba, ctx);
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}
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static u32 get_image_width_roundup(u16 width, u8 bytespp)
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{
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unsigned long stride = width * bytespp;
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unsigned long ceil_pages_per_stride = (stride / VRFB_PAGE_WIDTH) +
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(stride % VRFB_PAGE_WIDTH != 0);
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return ceil_pages_per_stride * VRFB_PAGE_WIDTH / bytespp;
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}
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/*
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* This the extra space needed in the VRFB physical area for VRFB to safely wrap
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* any memory accesses to the invisible part of the virtual view to the physical
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* area.
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*/
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static inline u32 get_extra_physical_size(u16 image_width_roundup, u8 bytespp)
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{
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return (OMAP_VRFB_LINE_LEN - image_width_roundup) * VRFB_PAGE_HEIGHT *
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bytespp;
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}
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void omap_vrfb_restore_context(void)
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{
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int i;
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unsigned long map = ctx_map;
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for (i = ffs(map); i; i = ffs(map)) {
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/* i=1..32 */
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i--;
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map &= ~(1 << i);
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restore_hw_context(i);
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}
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}
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void omap_vrfb_adjust_size(u16 *width, u16 *height,
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u8 bytespp)
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{
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*width = ALIGN(*width * bytespp, VRFB_PAGE_WIDTH) / bytespp;
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*height = ALIGN(*height, VRFB_PAGE_HEIGHT);
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}
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EXPORT_SYMBOL(omap_vrfb_adjust_size);
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u32 omap_vrfb_min_phys_size(u16 width, u16 height, u8 bytespp)
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{
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unsigned long image_width_roundup = get_image_width_roundup(width,
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bytespp);
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if (image_width_roundup > OMAP_VRFB_LINE_LEN)
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return 0;
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return (width * height * bytespp) + get_extra_physical_size(
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image_width_roundup, bytespp);
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}
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EXPORT_SYMBOL(omap_vrfb_min_phys_size);
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u16 omap_vrfb_max_height(u32 phys_size, u16 width, u8 bytespp)
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{
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unsigned long image_width_roundup = get_image_width_roundup(width,
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bytespp);
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unsigned long height;
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unsigned long extra;
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if (image_width_roundup > OMAP_VRFB_LINE_LEN)
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return 0;
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extra = get_extra_physical_size(image_width_roundup, bytespp);
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if (phys_size < extra)
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return 0;
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height = (phys_size - extra) / (width * bytespp);
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/* Virtual views provided by VRFB are limited to 2048x2048. */
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return min_t(unsigned long, height, 2048);
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}
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EXPORT_SYMBOL(omap_vrfb_max_height);
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void omap_vrfb_setup(struct vrfb *vrfb, unsigned long paddr,
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u16 width, u16 height,
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unsigned bytespp, bool yuv_mode)
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{
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unsigned pixel_size_exp;
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u16 vrfb_width;
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u16 vrfb_height;
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u8 ctx = vrfb->context;
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u32 size;
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u32 control;
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DBG("omapfb_set_vrfb(%d, %lx, %dx%d, %d, %d)\n", ctx, paddr,
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width, height, bytespp, yuv_mode);
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/* For YUV2 and UYVY modes VRFB needs to handle pixels a bit
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* differently. See TRM. */
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if (yuv_mode) {
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bytespp *= 2;
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width /= 2;
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}
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if (bytespp == 4)
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pixel_size_exp = 2;
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else if (bytespp == 2)
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pixel_size_exp = 1;
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else
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BUG();
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vrfb_width = ALIGN(width * bytespp, VRFB_PAGE_WIDTH) / bytespp;
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vrfb_height = ALIGN(height, VRFB_PAGE_HEIGHT);
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DBG("vrfb w %u, h %u bytespp %d\n", vrfb_width, vrfb_height, bytespp);
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size = vrfb_width << SMS_IMAGEWIDTH_OFFSET;
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size |= vrfb_height << SMS_IMAGEHEIGHT_OFFSET;
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control = pixel_size_exp << SMS_PS_OFFSET;
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control |= VRFB_PAGE_WIDTH_EXP << SMS_PW_OFFSET;
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control |= VRFB_PAGE_HEIGHT_EXP << SMS_PH_OFFSET;
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vrfb_hw_context[ctx].physical_ba = paddr;
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vrfb_hw_context[ctx].size = size;
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vrfb_hw_context[ctx].control = control;
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omap2_sms_write_rot_physical_ba(paddr, ctx);
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omap2_sms_write_rot_size(size, ctx);
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omap2_sms_write_rot_control(control, ctx);
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DBG("vrfb offset pixels %d, %d\n",
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vrfb_width - width, vrfb_height - height);
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vrfb->xres = width;
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vrfb->yres = height;
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vrfb->xoffset = vrfb_width - width;
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vrfb->yoffset = vrfb_height - height;
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vrfb->bytespp = bytespp;
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vrfb->yuv_mode = yuv_mode;
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}
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EXPORT_SYMBOL(omap_vrfb_setup);
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int omap_vrfb_map_angle(struct vrfb *vrfb, u16 height, u8 rot)
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{
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unsigned long size = height * OMAP_VRFB_LINE_LEN * vrfb->bytespp;
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vrfb->vaddr[rot] = ioremap_wc(vrfb->paddr[rot], size);
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if (!vrfb->vaddr[rot]) {
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printk(KERN_ERR "vrfb: ioremap failed\n");
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return -ENOMEM;
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}
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DBG("ioremapped vrfb area %d of size %lu into %p\n", rot, size,
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vrfb->vaddr[rot]);
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return 0;
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}
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EXPORT_SYMBOL(omap_vrfb_map_angle);
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void omap_vrfb_release_ctx(struct vrfb *vrfb)
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{
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int rot;
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int ctx = vrfb->context;
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if (ctx == 0xff)
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return;
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DBG("release ctx %d\n", ctx);
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mutex_lock(&ctx_lock);
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BUG_ON(!(ctx_map & (1 << ctx)));
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clear_bit(ctx, &ctx_map);
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for (rot = 0; rot < 4; ++rot) {
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if (vrfb->paddr[rot]) {
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release_mem_region(vrfb->paddr[rot], OMAP_VRFB_SIZE);
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vrfb->paddr[rot] = 0;
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}
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}
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vrfb->context = 0xff;
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mutex_unlock(&ctx_lock);
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}
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EXPORT_SYMBOL(omap_vrfb_release_ctx);
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int omap_vrfb_request_ctx(struct vrfb *vrfb)
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{
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int rot;
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u32 paddr;
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u8 ctx;
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int r;
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DBG("request ctx\n");
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mutex_lock(&ctx_lock);
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for (ctx = 0; ctx < VRFB_NUM_CTXS; ++ctx)
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if ((ctx_map & (1 << ctx)) == 0)
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break;
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if (ctx == VRFB_NUM_CTXS) {
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pr_err("vrfb: no free contexts\n");
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r = -EBUSY;
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goto out;
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}
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DBG("found free ctx %d\n", ctx);
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set_bit(ctx, &ctx_map);
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memset(vrfb, 0, sizeof(*vrfb));
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vrfb->context = ctx;
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for (rot = 0; rot < 4; ++rot) {
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paddr = SMS_ROT_VIRT_BASE(ctx, rot);
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if (!request_mem_region(paddr, OMAP_VRFB_SIZE, "vrfb")) {
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pr_err("vrfb: failed to reserve VRFB "
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"area for ctx %d, rotation %d\n",
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ctx, rot * 90);
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omap_vrfb_release_ctx(vrfb);
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r = -ENOMEM;
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goto out;
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}
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vrfb->paddr[rot] = paddr;
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DBG("VRFB %d/%d: %lx\n", ctx, rot*90, vrfb->paddr[rot]);
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}
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r = 0;
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out:
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mutex_unlock(&ctx_lock);
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return r;
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}
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EXPORT_SYMBOL(omap_vrfb_request_ctx);
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