.: Multiple changes

arch: Implement ARM32 support
soc: Implement ARM32 support for MSM8916
board: Implement ARM32 support for Samsung Galaxy J5 2015
include: main: Revert built-in memcpy, rearrange and add support for writel
lib: simplefb: Make the clear screen function usable

Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
Cc: Efim Girjeu <efimgirjeu@gmail.com>

arch/arm/Start.S

@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2022, Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
+ */
+
+    ldr r0, =dtb
+    ldr r1, =kernel
+    b main
+
+.global load_kernel
+load_kernel:
+    bx r4

arch/arm/linker.lds.S

@@ -0,0 +1,29 @@
+ENTRY(_start);
+
+OUTPUT_FORMAT("elf32-littlearm")
+OUTPUT_ARCH(arm)
+TARGET(binary)
+
+INPUT(KERNEL_PATH)
+INPUT(DTB_PATH)
+
+SECTIONS
+{
+        . = 0x80008000;
+	
+        .boot : {
+                arch/arm/Start.o
+        }
+
+        .dtb ALIGN(0x1000) : {
+                dtb = .;
+                DTB_PATH
+        }
+
+        .kernel ALIGN(0x1000) : {
+                kernel = .;
+                KERNEL_PATH
+        }
+
+        kernel_size = SIZEOF(.kernel);
+}

board/Kconfig

@@ -42,6 +42,12 @@ menu "Device Support"
 		help
 		  Say Y if you want to include support for Samsung Galaxy S9
 
+	config SAMSUNG_J5LTE
+		bool "Support for Samsung Galaxy J5 2015"
+		default n
+		depends on QC32_8916
+		help
+		  Say Y if you want to include arm32 support for Samsung Galaxy J5 2015
 endmenu
 
 menu "Device Specific Addresses"
@@ -54,6 +60,7 @@ menu "Device Specific Addresses"
 		default 0x090000000 if SAMSUNG_ZEROFLTE
 		default 0x090000000 if SAMSUNG_DREAMLTE
 		default 0x090000000 if SAMSUNG_STARLTE
+		default 0x090000000 if SAMSUNG_J5LTE
 
 	config FRAMEBUFFER_BASE
 		hex "Framebuffer Base Address (for SimpleFB)"
@@ -64,6 +71,7 @@ menu "Device Specific Addresses"
 		default 0x0e2a00000 if SAMSUNG_ZEROFLTE
 		default 0x0cc000000 if SAMSUNG_DREAMLTE
 		default 0x0cc000000 if SAMSUNG_STARLTE
+		default 0x08e000000 if SAMSUNG_J5LTE
 
 	config FRAMEBUFFER_WIDTH
 		int "Framebuffer Width (for SimpleFB)"
@@ -74,6 +82,7 @@ menu "Device Specific Addresses"
 		default 1440 if SAMSUNG_ZEROFLTE
 		default 1440 if SAMSUNG_DREAMLTE
 		default 1440 if SAMSUNG_STARLTE
+		default 720 if SAMSUNG_J5LTE
 
 	config FRAMEBUFFER_HEIGHT
 		int "Framebuffer Height (for SimpleFB)"
@@ -84,6 +93,7 @@ menu "Device Specific Addresses"
 		default 2560 if SAMSUNG_ZEROFLTE
 		default 2960 if SAMSUNG_DREAMLTE
 		default 2960 if SAMSUNG_STARLTE
+		default 1280 if SAMSUNG_J5LTE
 
 	config FRAMEBUFFER_STRIDE
 		int "Framebuffer Stride (for SimpleFB)"
@@ -94,5 +104,6 @@ menu "Device Specific Addresses"
 		default 4 if SAMSUNG_ZEROFLTE
 		default 4 if SAMSUNG_DREAMLTE
 		default 4 if SAMSUNG_STARLTE
+		default 4 if SAMSUNG_J5LTE
 
 endmenu

board/Makefile

@@ -4,3 +4,4 @@ lib-$(CONFIG_SAMSUNG_JACKPOTLTE) += samsung/board-jackpotlte.o
 lib-$(CONFIG_SAMSUNG_ZEROFLTE) += samsung/board-zeroflte.o
 lib-$(CONFIG_SAMSUNG_DREAMLTE) += samsung/board-dreamlte.o
 lib-$(CONFIG_SAMSUNG_STARLTE) += samsung/board-starlte.o
+lib-$(CONFIG_SAMSUNG_J5LTE) += samsung/board-j5lte.o

board/samsung/board-j5lte.c

@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2022, Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
+ */
+
+#include <main.h>
+
+#define PIPE_SSPP_SRC_FORMAT                    0x30
+#define PIPE_SSPP_SRC_UNPACK_PATTERN            0x34
+#define PIPE_BASE				0x1A15000
+#define PIPE_SSPP_SRC_YSTRIDE			0x24
+
+#define MDP_CTL_0_BASE                          0x1A02000
+#define CTL_FLUSH				0x18
+
+void board_init(void) {
+	/* TODO: Doesn't really work :P */
+	writel(0x000236FF, PIPE_BASE + PIPE_SSPP_SRC_FORMAT);
+	writel(0x03020001, PIPE_BASE + PIPE_SSPP_SRC_UNPACK_PATTERN);
+	writel(720 * 4, MDP_CTL_0_BASE + CTL_FLUSH);
+	writel((1 << (0)), PIPE_BASE + PIPE_SSPP_SRC_YSTRIDE);
+}
+
+void reboot(void) {
+	writel(0x0, 0x004AB000);
+}

configs/j5lte_defconfig

@@ -0,0 +1,3 @@
+CONFIG_CROSS_COMPILE="arm-none-eabi-"
+CONFIG_SAMSUNG_J5LTE=y
+CONFIG_QC32_8916=y

include/main.h

@@ -13,37 +13,17 @@ extern void load_kernel(void* dtb, void* x1, void* x2, void* x3, void* kernel);
 extern void soc_init(void);
 extern void board_init(void);
 
+extern void clean_fb(volatile char *fb, int width, int height, int stride);
 extern void printk(char *text);
 
-#ifndef __has_builtin
+extern void writel(unsigned int value, void* address);
-	#define __has_builtin(x) 0
+#ifdef __aarch64__
+	/* Define our own 128 bit memcpy */
+	extern void memcpy(void *dest, void *src, size_t size);
 #endif
 
-#if __has_builtin(__builtin_memcpy)
+#ifdef __arm__
-	void memcpy(void *dest, void *src, size_t size) {
+	extern void memcpy (char* src, char* dest, size_t len);
-		__builtin_memcpy(dest, src, size);
-	}
-#else
-	#ifdef __aarch64__
-		/* Define our own 128 bit memcpy */
-		void memcpy(void *dest, void *src, size_t size)
-		{
-			unsigned __int128 *src2 = src;
-			unsigned __int128 *dest2 = dest;
-
-			for (size_t i = 0; i < size / 16; i++)
-				dest2[i] = src2[i];
-		}
-	#endif
-
-	#ifdef __arm__
-		void memcpy (char* src, char* dest, size_t len) {
-			for (size_t i = 0; i < len; i++)
-				dest[i] = src[i];
-		}
-	#endif
 #endif
 
-
-
 #endif // MAIN_H_

include/soc/msm8916.h

@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2022, Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
+ */
+
+#ifndef MSM8916_H_	/* Include guard */
+#define MSM8916_H_
+
+#endif // MSM8916_H_

lib/debug/debug.c

@@ -3,6 +3,16 @@
  * Copyright (c) 2022, Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
  */
 #include <lib/debug.h>
+#include <stddef.h>
+
+/* TODO: Import libc */
+void writel(unsigned int value, void* address) {
+    // Cast the address pointer to a 32-bit unsigned integer pointer
+    volatile unsigned int* ptr = (volatile unsigned int*)address;
+
+    // Write the value to the memory location
+    *ptr = value;
+}
 
 void printk(char *text) {
 #ifdef CONFIG_SIMPLE_FB
@@ -16,3 +26,22 @@ void printk(char *text) {
 	debug_linecount++;
 #endif
 }
+
+	#ifdef __aarch64__
+		/* Define our own 128 bit memcpy */
+		void memcpy(void *dest, void *src, size_t size)
+		{
+			unsigned __int128 *src2 = src;
+			unsigned __int128 *dest2 = dest;
+
+			for (size_t i = 0; i < size / 16; i++)
+				dest2[i] = src2[i];
+		}
+	#endif
+
+	#ifdef __arm__
+		void memcpy (char* src, char* dest, size_t len) {
+			for (size_t i = 0; i < len; i++)
+				dest[i] = src[i];
+		}
+	#endif

lib/simplefb/simplefb.c

@@ -8,7 +8,7 @@
 #include <lib/simplefb.h>
 #include <lib/font.h>
 
-void clean_fb(volatile char *fb, char *text, int width, int height, int stride) {
+void clean_fb(volatile char *fb, int width, int height, int stride) {
 	for (volatile char *addr = fb; addr < fb + (width * height * stride); addr += stride)
 		*(int*) (addr) = 0x0;
 }

main/main.c

@@ -6,9 +6,12 @@
 #include <main.h>
 
 void main(void* dt, void* kernel) {
-	/* C entry */
-
 	/* Initialize SoC and Board specific peripherals/quirks */
+
+	/* TODO: Find a better way to make this more universal (since devices like arm64 Samsung Galaxies enable FB after soc_init) */
+#ifdef CONFIG_SIMPLE_FB
+	clean_fb((char*)CONFIG_FRAMEBUFFER_BASE, CONFIG_FRAMEBUFFER_WIDTH, CONFIG_FRAMEBUFFER_HEIGHT, CONFIG_FRAMEBUFFER_STRIDE);
+#endif
 	soc_init();
 	printk("soc_init() passed!");
 
@@ -17,6 +20,10 @@ void main(void* dt, void* kernel) {
 
 	/* Copy kernel to memory and boot  */
 	printk("Booting linux...");
-	__builtin_memcpy((void*)CONFIG_PAYLOAD_ENTRY, kernel, (unsigned long) &kernel_size);
+
-	load_kernel(dt, 0, 0, 0, (void*)CONFIG_PAYLOAD_ENTRY);	
+	memcpy((void*)CONFIG_PAYLOAD_ENTRY, kernel, (unsigned long) &kernel_size);
+	load_kernel(dt, 0, 0, 0, (void*)CONFIG_PAYLOAD_ENTRY);
+
+	/* We shouldn't get there */
+	while(1) {}
 }

soc/Kconfig

@@ -6,6 +6,10 @@ config EXYNOS
 	bool
 	default n
 
+config QUALCOMM
+	bool
+	default n
+
 choice
 	prompt "SoC Support"
 
@@ -43,5 +47,12 @@ choice
 		select EXYNOS
 		help
 		  Say Y if your device uses Samsung Exynos9810 SoC
+
+	config QC32_8916
+		bool "Support for QUALCOMM MSM8916"
+		default n
+		select QUALCOMM
+		help
+		  Say Y if your device uses this Qualcomm SoC
 endchoice
 

soc/Makefile

@@ -3,3 +3,4 @@ lib-$(CONFIG_EXYNOS_7420) += exynos/exynos7420.o
 lib-$(CONFIG_EXYNOS_7885) += exynos/exynos7885.o
 lib-$(CONFIG_EXYNOS_8895) += exynos/exynos8895.o
 lib-$(CONFIG_EXYNOS_9810) += exynos/exynos9810.o
+lib-$(CONFIG_QC32_8916) += qualcomm/msm8916.o

soc/qualcomm/msm8916.c

@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2022, Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
+ */
+
+#include <soc/msm8916.h>
+
+void soc_init(void) {
+	
+}