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imx8: cleanup framebuffer code

We can get rid of a bunch of stuff now that we'r using a softscreen.

Get rid of the static Memimage and Memdata for the framebuffer;
just allocate gscreen as a memimage from the image pool.

Avoid exporting fbraw pointer, just have screeninit() return it.

Remove fbmemalloc() function. it used to create a write-thru
mapping but given that we are no more reading the framebuffer,
we can use ucalloc() instead.

--- a/sys/src/9/imx8/fns.h

+++ b/sys/src/9/imx8/fns.h

@@ -80,7 +80,6 @@

 extern void putasid(Proc*);

 extern void* ucalloc(usize);

-extern void* fbmemalloc(usize);

 /* clock */

 extern void clockinit(void);

--- a/sys/src/9/imx8/lcd.c

+++ b/sys/src/9/imx8/lcd.c

@@ -12,8 +12,6 @@

 #include	<cursor.h>

 #include	"screen.h"

-extern u8int *fbraw;

-

 /* system reset controller registers */

 enum {

 	SRC_MIPIPHY_RCR = 0x28/4,

@@ -455,7 +453,7 @@

 }

 static void

-lcdifinit(struct video_mode *mode)

+lcdifinit(struct video_mode *mode, u32int framebuffer)

 {

 	wr(lcdif, LCDIF_CTRL_CLR, CTRL_SFTRST);

 	while(rr(lcdif, LCDIF_CTRL) & CTRL_SFTRST)

@@ -504,8 +502,8 @@

 	wr(lcdif, LCDIF_VDCTRL4,

 		sm(mode->hactive, VDCTRL4_DOTCLK_H_VALID_DATA_CNT));

-	wr(lcdif, LCDIF_CUR_BUF, PADDR(fbraw));

-	wr(lcdif, LCDIF_NEXT_BUF, PADDR(fbraw));

+	wr(lcdif, LCDIF_CUR_BUF, framebuffer);

+	wr(lcdif, LCDIF_NEXT_BUF, framebuffer);

 	wr(lcdif, LCDIF_CTRL_SET, CTRL_DOTCLK_MODE);

@@ -891,6 +889,7 @@

 	struct dsi_cfg dsi_cfg;

 	struct video_mode mode;

 	char *err;

+	void *fb;

 	intrenable(IRQlcdif, blankirq, nil, BUSUNKNOWN, "lcdif");

@@ -960,8 +959,8 @@

 	if(err != nil)

 		goto out;

-	/* allocates the framebuffer (gscreen->data->bdata) */

-	if(screeninit(mode.hactive, mode.vactive, 32) < 0){

+	/* allocates the framebuffer */

+	if((fb = screeninit(mode.hactive, mode.vactive, 32)) == nil){

 		err = "screeninit failed";

 		goto out;

 	}

@@ -980,7 +979,7 @@

 	bridgeinit(&mode, &dsi_cfg);

 	/* send the pixels */

-	lcdifinit(&mode);

+	lcdifinit(&mode, (u32int)PADDR(fb));

 	return;

 out:

--- a/sys/src/9/imx8/mmu.c

+++ b/sys/src/9/imx8/mmu.c

@@ -517,9 +517,3 @@

 {

 	return ucramalloc(size, 8, PTEUNCACHED);

 }

-

-void*

-fbmemalloc(usize size)

-{

-	return ucramalloc(PGROUND(size), BY2PG, PTEWT);

-}

--- a/sys/src/9/imx8/screen.c

+++ b/sys/src/9/imx8/screen.c

@@ -16,10 +16,9 @@

 };

 Memimage *gscreen;

-u8int *fbraw;

-static Memdata xgdata;

-static Memimage xgscreen;

+static ulong *fbraw;

+

 static Memimage *conscol;

 static Memimage *back;

 static Memsubfont *memdefont;

@@ -85,6 +84,7 @@

 hwdraw(Memdrawparam *par)

 {

 	Memimage *dst, *src, *mask;

+	uchar *scrd;

 	if((dst = par->dst) == nil || dst->data == nil)

 		return 0;

@@ -93,17 +93,18 @@

 	if((mask = par->mask) && mask->data == nil)

 		mask = nil;

-	if(dst->data->bdata == xgdata.bdata)

+	scrd = gscreen->data->bdata;

+	if(dst->data->bdata == scrd)

 		swcursoravoid(par->r);

-	if(src && src->data->bdata == xgdata.bdata)

+	if(src && src->data->bdata == scrd)

 		swcursoravoid(par->sr);

-	if(mask && mask->data->bdata == xgdata.bdata)

+	if(mask && mask->data->bdata == scrd)

 		swcursoravoid(par->mr);

 	return 0;

 }

-int

+void*

 screeninit(int width, int height, int depth)

 {

 	ulong chan;

@@ -110,7 +111,7 @@

 	switch(depth){

 	default:

-		return -1;

+		return nil;

 	case 32:

 		chan = XRGB32;

 		break;

@@ -121,21 +122,15 @@

 		chan = RGB16;

 		break;

 	}

-	memsetchan(&xgscreen, chan);

-	xgscreen.r = Rect(0, 0, width, height);

-	xgscreen.clipr = xgscreen.r;

-	xgscreen.depth = depth;

-	xgscreen.width = wordsperline(xgscreen.r, xgscreen.depth);

-	xgdata.bdata = malloc(xgscreen.width*sizeof(ulong)*height);

-	xgdata.ref = 1;

+	memimageinit();

-	xgscreen.data = &xgdata;

-	gscreen = &xgscreen;

+	gscreen = allocmemimage(Rect(0, 0, width, height), chan);

+	if(gscreen == nil)

+		return nil;

+

 	conf.monitor = 1;

+	fbraw = ucalloc(PGROUND(gscreen->width*sizeof(ulong)*height));

-	fbraw = fbmemalloc(xgscreen.width*sizeof(ulong)*height);

-

-	memimageinit();

 	memdefont = getmemdefont();

 	screenwin();

 	myscreenputs(kmesg.buf, kmesg.n);

@@ -142,25 +137,26 @@

 	screenputs = myscreenputs;

 	swcursorinit();

-	return 0;

+	return fbraw;

 }

 void

 flushmemscreen(Rectangle r)

 {

-	int pitch, n, y;

+	int pitch, n;

 	ulong *d, *s;

-	if(rectclip(&r, xgscreen.r)){

-		s = wordaddr(&xgscreen, r.min);

-		d = (ulong*)fbraw + (s - wordaddr(&xgscreen, xgscreen.r.min));

-		n = bytesperline(r, xgscreen.depth);

-		pitch = wordsperline(xgscreen.r, xgscreen.depth);

-		for(y = 0; y < Dy(r); y++){

-			memmove(d, s, n);

-			d += pitch;

-			s += pitch;

-		}

+	if(!rectclip(&r, gscreen->r))

+		return;

+

+	s = wordaddr(gscreen, r.min);

+	d = fbraw + (s - wordaddr(gscreen, gscreen->r.min));

+	n = bytesperline(r, gscreen->depth);

+	pitch = wordsperline(gscreen->r, gscreen->depth);

+	while(r.min.y++ < r.max.y){

+		memmove(d, s, n);

+		d += pitch;

+		s += pitch;

 	}

 }

--- a/sys/src/9/imx8/screen.h

+++ b/sys/src/9/imx8/screen.h

@@ -7,7 +7,7 @@

 extern void mouseaccelerate(int);

 /* screen.c */

-extern int	screeninit(int width, int hight, int depth);

+extern void*	screeninit(int width, int hight, int depth);

 extern void	blankscreen(int);

 extern void	flushmemscreen(Rectangle);

 extern Memdata*	attachscreen(Rectangle*, ulong*, int*, int*, int*);