# --- T2-COPYRIGHT-NOTE-BEGIN ---
# T2 SDE: architecture/mips64/package/*/4005_all-add-impact_early.patch
# Copyright (C) 2024 The T2 SDE Project
# 
# This Copyright note is generated by scripts/Create-CopyPatch,
# more information can be found in the files COPYING and README.
# 
# This patch file is dual-licensed. It is available under the license the
# patched project is licensed under, as long as it is an OpenSource license
# as defined at http://www.opensource.org/ (e.g. BSD, X11) or under the terms
# of the GNU General Public License version 2 as used by the T2 SDE.
# --- T2-COPYRIGHT-NOTE-END ---

--- linux-6.11/arch/mips/sgi-ip30/Makefile.vanilla	2024-10-15 13:55:59.093307362 +0200
+++ linux-6.11/arch/mips/sgi-ip30/Makefile	2024-10-15 13:56:10.136640640 +0200
@@ -6,4 +6,5 @@
 obj-y	:= ip30-irq.o ip30-power.o ip30-setup.o ip30-timer.o ip30-xtalk.o
 
 obj-$(CONFIG_EARLY_PRINTK)	+= ip30-console.o
+obj-$(CONFIG_EARLY_IMPACT_PRINTK)	+= impact-earlycon.o
 obj-$(CONFIG_SMP)		+= ip30-smp.o
--- linux-6.11/arch/mips/Kconfig.debug.vanilla	2024-10-15 13:56:22.499973905 +0200
+++ linux-6.11/arch/mips/Kconfig.debug	2024-10-15 13:57:34.216640097 +0200
@@ -26,6 +26,18 @@
 config USE_GENERIC_EARLY_PRINTK_8250
 	bool
 
+config EARLY_IMPACT_PRINTK
+	bool "Early Impact printk" if EXPERT
+	depends on (SGI_IP22 || SGI_IP26 || SGI_IP28 || SGI_IP30) && EARLY_PRINTK
+	select FB_IMPACT_EARLY
+	select FONT_SUPPORT
+	select FONT_8x16
+	help
+	  This options enables utilizing the Impact as an early boot console
+	  for debugging purposes.  It is fixed at 1280x1024 resolution and
+	  overwrites top-to-bottom.  A solid red line indicates the last line
+	  of text written.
+
 config CMDLINE_BOOL
 	bool "Built-in kernel command line"
 	help
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 2c96c0c68116..d5b6c6816af5 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -53,6 +53,10 @@ EXPORT_SYMBOL(cpu_data);
 struct screen_info screen_info;
 #endif
 
+#if defined(CONFIG_EARLY_IMPACT_PRINTK)
+	extern void setup_early_impact_printk(void);
+#endif
+
 /*
  * Setup information
  *
@@ -1011,7 +1015,11 @@ void __init setup_arch(char **cmdline_p)
 
 	setup_early_fdc_console();
 #ifdef CONFIG_EARLY_PRINTK
+#if defined(CONFIG_EARLY_IMPACT_PRINTK)
+	setup_early_impact_printk();
+#else
 	setup_early_printk();
+#endif
 #endif
 	cpu_report();
 	check_bugs_early();
diff --git a/arch/mips/sgi-common/impact-earlycon.c b/arch/mips/sgi-common/impact-earlycon.c
new file mode 100644
index 000000000000..eb104736b1a5
--- /dev/null
+++ b/arch/mips/sgi-ip30/impact-earlycon.c
@@ -0,0 +1,45 @@
+/*
+ * Wrapper for an early console using the using the Impact Graphics Card
+ * as a debugging/early boot console.
+ *
+ * Copyright (c) 2004-2007 Stanislaw Skowronek
+ * Copyright (c) 2014-2015 Joshua Kinard
+ */
+#include <linux/kernel.h>
+#include <linux/console.h>
+#include <linux/printk.h>
+#include <linux/init.h>
+
+#include <asm/setup.h>
+
+extern void impact_early_init(void);
+extern void impact_early_char(u8 c, u32 f);
+extern struct console *early_console;
+
+static void
+early_impact_write(struct console *co, const char *s, u32 count)
+{
+	/* Do each character */
+	while (count--)
+		impact_early_char(*s++, 0xa0a0a0);
+}
+
+static struct console
+early_impact_cons = {
+	.name			= "early_impact",
+	.write			= early_impact_write,
+	.flags			= CON_PRINTBUFFER | CON_BOOT,
+	.index			= -1,
+};
+
+void __init
+setup_early_impact_printk(void)
+{
+	if (early_console)
+		return;
+
+	impact_early_init();
+	early_console = &early_impact_cons;
+
+	register_console(&early_impact_cons);
+}
diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
index 0f28a5604867..85266f32a6ba 100644
--- a/drivers/video/fbdev/Kconfig
+++ b/drivers/video/fbdev/Kconfig
@@ -721,6 +721,10 @@ config FB_GBE_MEM
 	  This is the amount of memory reserved for the framebuffer,
 	  which can be any value between 1MB and 8MB.
 
+config FB_IMPACT_EARLY
+	bool
+	depends on (SGI_IP22 || SGI_IP26 || SGI_IP27 || SGI_IP28 || SGI_IP30)
+
 config FB_IMPACT
 	tristate "SGI Impact graphics support"
 	depends on FB && (SGI_IP22 || SGI_IP26 || SGI_IP27 || SGI_IP28 || SGI_IP30)
diff --git a/drivers/video/fbdev/Makefile b/drivers/video/fbdev/Makefile
index 25e16a8be5aa..fe6e00846599 100644
--- a/drivers/video/fbdev/Makefile
+++ b/drivers/video/fbdev/Makefile
@@ -126,6 +126,7 @@ obj-$(CONFIG_FB_HYPERV)		  += hyperv_fb.o
 obj-$(CONFIG_FB_OPENCORES)	  += ocfb.o
 obj-$(CONFIG_FB_SM712)		  += sm712fb.o
 obj-$(CONFIG_FB_IMPACT)		  += impact.o
+obj-$(CONFIG_FB_IMPACT_EARLY)	  += impact_early.o
 
 # Platform or fallback drivers go here
 obj-$(CONFIG_FB_UVESA)            += uvesafb.o
diff --git a/drivers/video/fbdev/impact_early.c b/drivers/video/fbdev/impact_early.c
new file mode 100644
index 000000000000..0ab9c77b5245
--- /dev/null
+++ b/drivers/video/fbdev/impact_early.c
@@ -0,0 +1,197 @@
+/*
+ * linux/drivers/video/impact_early.c
+ *  -- SGI Octane/Indigo2 MardiGras (IMPACT) graphics
+ *
+ *  Copyright (c) 2004 by Stanislaw Skowronek
+ *  Copyright (c) 2005 by Peter Fuerst (Indigo2 Support)
+ *  Copyright (c) 2011-2014 by Joshua Kinard (Fixes, Maintenance)
+ *
+ *  Separated from linux/drivers/video/fbdev/impact.c
+ *
+ *  This driver provides direct access to the Impact hardware for
+ *  early_console support.  It can typically be initialized after the
+ *  CPU(s) have been setup, but before anything else, like IRQs.  Handy for
+ *  debugging core startup code on a machine as difficult as Octane or the
+ *  Indigo2 Impact R10000 (because of a non-coherent cache).
+ *
+ *  When running, the driver will draw a solid red line across the screen
+ *  to denote the current output line.  It will scroll from top to the bottom
+ *  of the screen and then begin overwriting from the top again.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/font.h>
+#include <linux/platform_device.h>
+
+#include <video/impact.h>
+
+static int posx = -1;
+static int posy = -1;
+DEFINE_SPINLOCK(impact_early_lock);
+
+/**
+ * impact_wait_cfifo_empty - wait until impact CFIFO buffer is empty.
+ * @info: struct fb_info pointer to framebuffer data.
+ */
+static inline void
+impact_early_wait_cfifo_empty(void)
+{
+	while (IMP_FIFOSTATUS(MMIO_FIXED) & MSK_CFIFO_CNT)
+		cpu_relax();
+}
+
+/**
+ * impact_early_rect - early fill rectangle (?).
+ * @x: x point.
+ * @y: y point.
+ * @w: width.
+ * @h: height.
+ * @c: color.
+ */
+static void
+impact_early_rect(u32 x, u32 y, u32 w, u32 h, u32 c)
+{
+	impact_early_wait_cfifo_empty();
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_PP1FILLMODE(0x6300, IMP_LO_COPY);
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_FILLMODE(0);
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_PACKEDCOLOR(c);
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_BLOCKXYSTARTI(x, y);
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_BLOCKXYENDI(((x + w) - 1),
+							  ((y + h) - 1));
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_IR_ALIAS(0x18);
+}
+
+/**
+ * impact_early_paintchar - early character drawing.
+ * @x: x point.
+ * @y: y point.
+ * @b: u8 pointer to font data.
+ * @c: color.
+ * @a: alpha (?).
+ */
+static void
+impact_early_paintchar(u32 x, u32 y, u8 *b, u32 c, u32 a)
+{
+	int v;
+
+	impact_early_wait_cfifo_empty();
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_PP1FILLMODE(0x6300, IMP_LO_COPY);
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_FILLMODE(0x400018);
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_PACKEDCOLOR(c);
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_BKGRD_RG(a & 0xffff);
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_BKGRD_BA((a & 0xff0000) >> 16);
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_BLOCKXYSTARTI(x, y);
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_BLOCKXYENDI((x + 7), (y + 15));
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_IR_ALIAS(0x18);
+
+	for (v = 0; v < 16; v++)
+		IMP_CFIFO(MMIO_FIXED) = IMP_CMD_CHAR((*(b++)) << 24);
+}
+
+/**
+ * impact_early_char - print character to early_console.
+ * @c: character to print.
+ * @f: line color (?).
+ */
+void
+impact_early_char(u8 c, u32 f)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&impact_early_lock, flags);
+	if (posx == -1)
+		goto out;
+
+	if (c == '\n') {
+		posy += 16;
+
+		if (posy >= 1024)
+			posy = 0;
+
+		posx = 0;
+	} else {
+		if (posx == 0) {
+			impact_early_rect(0, posy, 1280, 16, 0x000000);
+			if ((posy + 16) < 1024)
+				impact_early_rect(0, (posy + 16),
+						  1280, 2, 0x0000ff);
+		}
+
+		impact_early_paintchar(posx, posy,
+				       ((u8 *)font_vga_8x16.data + (c << 4)),
+				       f, 0);
+		posx += 8;
+
+		if (posx >= 1280) {
+			posx = 0;
+			posy++;
+
+			if (posy >= 1024)
+				posy = 0;
+		}
+	}
+
+out:
+	spin_unlock_irqrestore(&impact_early_lock, flags);
+}
+
+/**
+ * impact_early_string - print string to early_console.
+ * @s: string to print.
+ * @f: line color (?).
+ */
+void
+impact_early_string(u8 *s, u32 f)
+{
+	while (*s)
+		impact_early_char(*(s++), f);
+}
+
+/**
+ * impact_early_hw_init - early hardware init.
+ */
+static void __init
+impact_early_hw_init(void)
+{
+	IMP_CFIFO_HW(MMIO_FIXED) = VAL_CFIFO_HW;
+	IMP_CFIFO_LW(MMIO_FIXED) = VAL_CFIFO_LW;
+	IMP_CFIFO_DELAY(MMIO_FIXED) = VAL_CFIFO_DELAY;
+	IMP_DFIFO_HW(MMIO_FIXED) = VAL_DFIFO_HW;
+	IMP_DFIFO_LW(MMIO_FIXED) = VAL_DFIFO_LW;
+	IMP_DFIFO_DELAY(MMIO_FIXED) = VAL_DFIFO_DELAY;
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_COLORMASKLSBSA(0xffffff);
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_COLORMASKLSBSB(0xffffff);
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_COLORMASKMSBS(0);
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_XFRMASKLO(0xffffff);
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_XFRMASKHI(0xffffff);
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_DRBPOINTERS(0xc8240);
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_CONFIG(0xcac);
+	IMP_CFIFO(MMIO_FIXED) = IMP_CMD_XYWIN(0, 0x3ff);
+	IMP_XMAP_PP1SELECT(MMIO_FIXED) = 0x01;
+	IMP_XMAP_INDEX(MMIO_FIXED) = 0x00;
+	IMP_XMAP_MAIN_MODE(MMIO_FIXED) = 0x07a4;
+	IMP_VC3_INDEXDATA(MMIO_FIXED) = 0x1d000100;
+}
+
+/**
+ * impact_early_init - init impact early_console.
+ */
+void __init
+impact_early_init(void)
+{
+	impact_early_hw_init();
+	impact_early_rect(0, 0, 1280, 1024, 0);
+	posx = 0;
+	posy = 0;
+	impact_early_string("Impact early console ready.\n", 0xffffff);
+}
+
+MODULE_AUTHOR("Stanislaw Skowronek <skylark@unaligned.org>");
+MODULE_AUTHOR("Joshua Kinard <kumba@gentoo.org>");
+MODULE_DESCRIPTION("SGI Impact Early Printk Driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("0.42.3");
+MODULE_ALIAS("platform:impact_early");