powerpc: Initialize btext subsystem later, after prom_init

We were initializing the btext stuff from prom_init(), thus breaking
the rule that all communication between prom_init() and the rest of
the kernel has to be via the flattened device tree.  This removes
the btext initialization calls from prom_init() and initializes it
instead after the device tree is unflattened.  It would be nice to
do it earlier, but that needs some more infrastructure to find the
properties we need in the flattened device tree.

Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/head_32.S

@@ -153,9 +153,6 @@ __after_mmu_off:
 	bl	flush_tlbs
 
 	bl	initial_bats
-#if !defined(CONFIG_APUS) && defined(CONFIG_BOOTX_TEXT)
-	bl	setup_disp_bat
-#endif
 
 /*
  * Call setup_cpu for CPU 0 and initialize 6xx Idle
@@ -1297,31 +1294,6 @@ initial_bats:
 	isync
 	blr
 
-#if !defined(CONFIG_APUS) && defined(CONFIG_BOOTX_TEXT)
-setup_disp_bat:
-	/*
-	 * setup the display bat prepared for us in prom.c
-	 */
-	mflr	r8
-	bl	reloc_offset
-	mtlr	r8
-	addis	r8,r3,disp_BAT@ha
-	addi	r8,r8,disp_BAT@l
-	lwz	r11,0(r8)
-	lwz	r8,4(r8)
-	mfspr	r9,SPRN_PVR
-	rlwinm	r9,r9,16,16,31		/* r9 = 1 for 601, 4 for 604 */
-	cmpwi	0,r9,1
-	beq	1f
-	mtspr	SPRN_DBAT3L,r8
-	mtspr	SPRN_DBAT3U,r11
-	blr
-1:	mtspr	SPRN_IBAT3L,r8
-	mtspr	SPRN_IBAT3U,r11
-	blr
-
-#endif /* !defined(CONFIG_APUS) && defined(CONFIG_BOOTX_TEXT) */
-
 
 #ifdef CONFIG_8260
 /* Jump into the system reset for the rom.

arch/powerpc/kernel/prom_init.c

@@ -1404,62 +1404,6 @@ static int __init prom_find_machine_type(void)
 #endif
 }
 
-static int __init setup_disp(phandle dp)
-{
-#if defined(CONFIG_BOOTX_TEXT) && defined(CONFIG_PPC32)
-	int width = 640, height = 480, depth = 8, pitch;
-	unsigned address;
-	u32 addrs[8][5];
-	int i, naddrs;
-	char name[32];
-	char *getprop = "getprop";
-
-	prom_printf("Initializing screen: ");
-
-	memset(name, 0, sizeof(name));
-	call_prom(getprop, 4, 1, dp, "name", name, sizeof(name));
-	name[sizeof(name)-1] = 0;
-	prom_print(name);
-	prom_print("\n");
-	call_prom(getprop, 4, 1, dp, "width", &width, sizeof(width));
-	call_prom(getprop, 4, 1, dp, "height", &height, sizeof(height));
-	call_prom(getprop, 4, 1, dp, "depth", &depth, sizeof(depth));
-	pitch = width * ((depth + 7) / 8);
-	call_prom(getprop, 4, 1, dp, "linebytes",
-		  &pitch, sizeof(pitch));
-	if (pitch == 1)
-		pitch = 0x1000;		/* for strange IBM display */
-	address = 0;
-	call_prom(getprop, 4, 1, dp, "address", &address, sizeof(address));
-	if (address == 0) {
-		/* look for an assigned address with a size of >= 1MB */
-		naddrs = call_prom(getprop, 4, 1, dp, "assigned-addresses",
-				   addrs, sizeof(addrs));
-		naddrs /= 20;
-		for (i = 0; i < naddrs; ++i) {
-			if (addrs[i][4] >= (1 << 20)) {
-				address = addrs[i][2];
-				/* use the BE aperture if possible */
-				if (addrs[i][4] >= (16 << 20))
-					address += (8 << 20);
-				break;
-			}
-		}
-		if (address == 0) {
-			prom_print("Failed to get address\n");
-			return 0;
-		}
-	}
-	/* kludge for valkyrie */
-	if (strcmp(name, "valkyrie") == 0)
-		address += 0x1000;
-
-	prom_printf("\n\n\n\naddress = %x\n", address);
-	btext_setup_display(width, height, depth, pitch, address);
-#endif /* CONFIG_BOOTX_TEXT && CONFIG_PPC32 */
-	return 1;
-}
-
 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
 {
 	return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
@@ -1479,7 +1423,6 @@ static void __init prom_check_displays(void)
 	phandle node;
 	ihandle ih;
 	int i;
-	int got_display = 0;
 
 	static unsigned char default_colors[] = {
 		0x00, 0x00, 0x00,
@@ -1546,8 +1489,6 @@ static void __init prom_check_displays(void)
 					   clut[2]) != 0)
 				break;
 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
-		if (!got_display)
-			got_display = setup_disp(node);
 	}
 }
 

arch/powerpc/kernel/setup_32.c

@@ -294,8 +294,6 @@ unsigned long __init early_init(unsigned long dt_ptr)
 {
 	unsigned long offset = reloc_offset();
 
-	reloc_got2(offset);
-
 	/*
 	 * Identify the CPU type and fix up code sections
 	 * that depend on which cpu we have.
@@ -303,12 +301,6 @@ unsigned long __init early_init(unsigned long dt_ptr)
 	identify_cpu(offset, 0);
 	do_cpu_ftr_fixups(offset);
 
-#ifdef CONFIG_BOOTX_TEXT
-	btext_prepare_BAT();
-#endif
-
-	reloc_got2(-offset);
-
 	return KERNELBASE + offset;
 }
 
@@ -578,13 +570,13 @@ void __init setup_arch(char **cmdline_p)
 	/* so udelay does something sensible, assume <= 1000 bogomips */
 	loops_per_jiffy = 500000000 / HZ;
 
-#ifdef CONFIG_BOOTX_TEXT
-	map_boot_text();
-#endif
-
 	unflatten_device_tree();
 	finish_device_tree();
 
+#ifdef CONFIG_BOOTX_TEXT
+	init_boot_display();
+#endif
+
 #ifdef CONFIG_PPC_MULTIPLATFORM
 	/* This could be called "early setup arch", it must be done
 	 * now because xmon need it

arch/powerpc/mm/init_32.c

@@ -188,13 +188,6 @@ void __init MMU_init(void)
 
 	if (ppc_md.progress)
 		ppc_md.progress("MMU:exit", 0x211);
-
-#ifdef CONFIG_BOOTX_TEXT
-	/* By default, we are no longer mapped */
-       	boot_text_mapped = 0;
-	/* Must be done last, or ppc_md.progress will die. */
-	map_boot_text();
-#endif
 }
 
 /* This is only called until mem_init is done. */