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#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 <mach/vrfb.h>
/*#define DEBUG*/
#ifdef DEBUG
#define DBG(format, ...) printk(KERN_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 OMAP_SMS_BASE 0x6C000000
#define SMS_ROT_CONTROL(context) (OMAP_SMS_BASE + 0x180 + 0x10 * context)
#define SMS_ROT_SIZE(context) (OMAP_SMS_BASE + 0x184 + 0x10 * context)
#define SMS_ROT_PHYSICAL_BA(context) (OMAP_SMS_BASE + 0x188 + 0x10 * context)
#define VRFB_NUM_CTXS 12
/* bitmap of reserved contexts */
static unsigned long ctx_map;
/* bitmap of contexts for which we have to keep the HW context valid */
static unsigned long ctx_map_active;
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)
{
omap_writel(vrfb_hw_context[ctx].control, SMS_ROT_CONTROL(ctx));
omap_writel(vrfb_hw_context[ctx].size, SMS_ROT_SIZE(ctx));
omap_writel(vrfb_hw_context[ctx].physical_ba, SMS_ROT_PHYSICAL_BA(ctx));
}
void omap_vrfb_restore_context(void)
{
int i;
unsigned long map = ctx_map_active;
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);
void omap_vrfb_setup(struct vrfb *vrfb, unsigned long paddr,
u16 width, u16 height,
enum omap_color_mode color_mode)
{
unsigned pixel_size_exp;
u16 vrfb_width;
u16 vrfb_height;
u8 ctx = vrfb->context;
u8 bytespp;
u32 size;
u32 control;
DBG("omapfb_set_vrfb(%d, %lx, %dx%d, %d)\n", ctx, paddr,
width, height, color_mode);
switch (color_mode) {
case OMAP_DSS_COLOR_RGB16:
case OMAP_DSS_COLOR_ARGB16:
bytespp = 2;
break;
case OMAP_DSS_COLOR_RGB24P:
bytespp = 3;
break;
case OMAP_DSS_COLOR_RGB24U:
case OMAP_DSS_COLOR_ARGB32:
case OMAP_DSS_COLOR_RGBA32:
case OMAP_DSS_COLOR_RGBX32:
case OMAP_DSS_COLOR_YUV2:
case OMAP_DSS_COLOR_UYVY:
bytespp = 4;
break;
default:
BUG();
}
if (color_mode == OMAP_DSS_COLOR_YUV2 ||
color_mode == OMAP_DSS_COLOR_UYVY)
width >>= 1;
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;
omap_writel(paddr, SMS_ROT_PHYSICAL_BA(ctx));
omap_writel(size, SMS_ROT_SIZE(ctx));
omap_writel(control, SMS_ROT_CONTROL(ctx));
DBG("vrfb offset pixels %d, %d\n",
vrfb_width - width, vrfb_height - height);
vrfb->xoffset = vrfb_width - width;
vrfb->yoffset = vrfb_height - height;
vrfb->bytespp = bytespp;
}
EXPORT_SYMBOL(omap_vrfb_setup);
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_active);
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) {
printk(KERN_ERR "vrfb: no free contexts\n");
r = -EBUSY;
goto out;
}
DBG("found free ctx %d\n", ctx);
set_bit(ctx, &ctx_map);
WARN_ON(ctx_map_active & (1 << ctx));
set_bit(ctx, &ctx_map_active);
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")) {
printk(KERN_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);
void omap_vrfb_suspend_ctx(struct vrfb *vrfb)
{
DBG("suspend ctx %d\n", vrfb->context);
mutex_lock(&ctx_lock);
BUG_ON(vrfb->context >= VRFB_NUM_CTXS);
BUG_ON(!((1 << vrfb->context) & ctx_map_active));
clear_bit(vrfb->context, &ctx_map_active);
mutex_unlock(&ctx_lock);
}
EXPORT_SYMBOL(omap_vrfb_suspend_ctx);
void omap_vrfb_resume_ctx(struct vrfb *vrfb)
{
DBG("resume ctx %d\n", vrfb->context);
mutex_lock(&ctx_lock);
BUG_ON(vrfb->context >= VRFB_NUM_CTXS);
BUG_ON((1 << vrfb->context) & ctx_map_active);
/*
* omap_vrfb_restore_context is normally called by the core domain
* save / restore logic, but since this VRFB context was suspended
* those calls didn't actually restore the context and now we might
* have an invalid context. Do an explicit restore here.
*/
restore_hw_context(vrfb->context);
set_bit(vrfb->context, &ctx_map_active);
mutex_unlock(&ctx_lock);
}
EXPORT_SYMBOL(omap_vrfb_resume_ctx);
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