Commit 640f9ca5 authored by Tomi Valkeinen's avatar Tomi Valkeinen
Browse files

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: default avatarTomi Valkeinen <tomi.valkeinen@nokia.com>
parent afedec18
/*
* 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.
*/
#ifndef __OMAP_VRFB_H__
#define __OMAP_VRFB_H__
#define OMAP_VRFB_LINE_LEN 2048
struct vrfb {
u8 context;
void __iomem *vaddr[4];
unsigned long paddr[4];
u16 xres;
u16 yres;
u16 xoffset;
u16 yoffset;
u8 bytespp;
bool yuv_mode;
};
extern int omap_vrfb_request_ctx(struct vrfb *vrfb);
extern void omap_vrfb_release_ctx(struct vrfb *vrfb);
extern void omap_vrfb_adjust_size(u16 *width, u16 *height,
u8 bytespp);
extern u32 omap_vrfb_min_phys_size(u16 width, u16 height, u8 bytespp);
extern u16 omap_vrfb_max_height(u32 phys_size, u16 width, u8 bytespp);
extern void omap_vrfb_setup(struct vrfb *vrfb, unsigned long paddr,
u16 width, u16 height,
unsigned bytespp, bool yuv_mode);
extern int omap_vrfb_map_angle(struct vrfb *vrfb, u16 height, u8 rot);
extern void omap_vrfb_restore_context(void);
#endif /* __VRFB_H */
config OMAP2_VRAM
bool
config OMAP2_VRFB
bool
obj-$(CONFIG_OMAP2_VRAM) += vram.o
obj-$(CONFIG_OMAP2_VRFB) += vrfb.o
/*
* 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 <mach/io.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();
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);
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