[2/6,v2] mips: Add N64 machine type

Commit Message

Lauri Kasanen Jan. 8, 2021, 8:31 a.m. UTC

Signed-off-by: Lauri Kasanen <[e-mail]>
---

v2:
smaller kmalloc align
irq header cleanup
no cpp comments
remove prom_free_prom_memory

 arch/mips/Kbuild.platforms               |   1 +
 arch/mips/Kconfig                        |  12 ++++
 arch/mips/include/asm/mach-n64/irq.h     |  22 ++++++
 arch/mips/include/asm/mach-n64/kmalloc.h |   8 +++
 arch/mips/n64/Makefile                   |   6 ++
 arch/mips/n64/Platform                   |   7 ++
 arch/mips/n64/init.c                     | 115 +++++++++++++++++++++++++++++++
 arch/mips/n64/irq.c                      |  16 +++++
 8 files changed, 187 insertions(+)
 create mode 100644 arch/mips/include/asm/mach-n64/irq.h
 create mode 100644 arch/mips/include/asm/mach-n64/kmalloc.h
 create mode 100644 arch/mips/n64/Makefile
 create mode 100644 arch/mips/n64/Platform
 create mode 100644 arch/mips/n64/init.c
 create mode 100644 arch/mips/n64/irq.c

--
2.6.2

Patch

diff --git a/arch/mips/Kbuild.platforms b/arch/mips/Kbuild.platforms
index 5483e38..e4f6e49 100644
--- a/arch/mips/Kbuild.platforms
+++ b/arch/mips/Kbuild.platforms
@@ -18,6 +18,7 @@  platform-$(CONFIG_MACH_LOONGSON2EF)	+= loongson2ef/
 platform-$(CONFIG_MACH_LOONGSON32)	+= loongson32/
 platform-$(CONFIG_MACH_LOONGSON64)	+= loongson64/
 platform-$(CONFIG_MIPS_MALTA)		+= mti-malta/
+platform-$(CONFIG_MACH_NINTENDO64)	+= n64/
 platform-$(CONFIG_NLM_COMMON)		+= netlogic/
 platform-$(CONFIG_PIC32MZDA)		+= pic32/
 platform-$(CONFIG_MACH_PISTACHIO)	+= pistachio/
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 4b52588..1b0aae0 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -605,6 +605,18 @@  config MACH_VR41XX
 	select SYS_SUPPORTS_MIPS16
 	select GPIOLIB

+config MACH_NINTENDO64
+	bool "Nintendo 64 console"
+	select CEVT_R4K
+	select CSRC_R4K
+	select SYS_HAS_CPU_R4300
+	select SYS_SUPPORTS_BIG_ENDIAN
+	select SYS_SUPPORTS_ZBOOT
+	select SYS_SUPPORTS_32BIT_KERNEL
+	select SYS_SUPPORTS_64BIT_KERNEL
+	select DMA_NONCOHERENT
+	select IRQ_MIPS_CPU
+
 config RALINK
 	bool "Ralink based machines"
 	select CEVT_R4K
diff --git a/arch/mips/include/asm/mach-n64/irq.h b/arch/mips/include/asm/mach-n64/irq.h
new file mode 100644
index 0000000..125e301
--- /dev/null
+++ b/arch/mips/include/asm/mach-n64/irq.h
@@ -0,0 +1,22 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_MACH_N64_IRQ_H
+#define __ASM_MACH_N64_IRQ_H
+
+#define NR_IRQS 8
+
+/*
+ * System-specifc irq names for clarity
+ */
+#define MIPS_CPU_IRQ(x)		(MIPS_CPU_IRQ_BASE + (x))
+#define MIPS_SOFTINT0_IRQ	MIPS_CPU_IRQ(0)
+#define MIPS_SOFTINT1_IRQ	MIPS_CPU_IRQ(1)
+#define RCP_IRQ			MIPS_CPU_IRQ(2)
+#define CART_IRQ		MIPS_CPU_IRQ(3)
+#define PRENMI_IRQ		MIPS_CPU_IRQ(4)
+#define RDBR_IRQ		MIPS_CPU_IRQ(5)
+#define RDBW_IRQ		MIPS_CPU_IRQ(6)
+#define TIMER_IRQ		MIPS_CPU_IRQ(7)
+
+#include <asm/mach-generic/irq.h>
+
+#endif /* __ASM_MACH_N64_IRQ_H */
diff --git a/arch/mips/include/asm/mach-n64/kmalloc.h b/arch/mips/include/asm/mach-n64/kmalloc.h
new file mode 100644
index 0000000..e8b8d0b
--- /dev/null
+++ b/arch/mips/include/asm/mach-n64/kmalloc.h
@@ -0,0 +1,8 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_MACH_N64_KMALLOC_H
+#define __ASM_MACH_N64_KMALLOC_H
+
+/* The default of 128 bytes wastes too much, use 32 (the largest cacheline, I) */
+#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
+
+#endif /* __ASM_MACH_N64_KMALLOC_H */
diff --git a/arch/mips/n64/Makefile b/arch/mips/n64/Makefile
new file mode 100644
index 0000000..b64a05a
--- /dev/null
+++ b/arch/mips/n64/Makefile
@@ -0,0 +1,6 @@ 
+# SPDX-License-Identifier: GPL-2.0
+#
+# Nintendo 64
+#
+
+obj-y := init.o irq.o
diff --git a/arch/mips/n64/Platform b/arch/mips/n64/Platform
new file mode 100644
index 0000000..2464783
--- /dev/null
+++ b/arch/mips/n64/Platform
@@ -0,0 +1,7 @@ 
+# SPDX-License-Identifier: GPL-2.0
+#
+# Nintendo 64
+#
+
+cflags-$(CONFIG_MACH_NINTENDO64)    += -I$(srctree)/arch/mips/include/asm/mach-n64
+load-$(CONFIG_MACH_NINTENDO64)      += 0xffffffff80101000
diff --git a/arch/mips/n64/init.c b/arch/mips/n64/init.c
new file mode 100644
index 0000000..8861ac3d
--- /dev/null
+++ b/arch/mips/n64/init.c
@@ -0,0 +1,115 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Nintendo 64 init.
+ *
+ *  Copyright (C) 2020	Lauri Kasanen
+ */
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/memblock.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/simplefb.h>
+#include <linux/string.h>
+
+#include <asm/bootinfo.h>
+#include <asm/fw/fw.h>
+#include <asm/time.h>
+
+#define IO_MEM_RESOURCE_START	0UL
+#define IO_MEM_RESOURCE_END	0x1fffffffUL
+
+static void __init iomem_resource_init(void)
+{
+	iomem_resource.start = IO_MEM_RESOURCE_START;
+	iomem_resource.end = IO_MEM_RESOURCE_END;
+}
+
+const char *get_system_type(void)
+{
+	return "Nintendo 64";
+}
+
+void __init prom_init(void)
+{
+	fw_init_cmdline();
+}
+
+#define W 320
+#define H 240
+#define REG_BASE ((u32 *) CKSEG1ADDR(0x4400000))
+
+static void __init n64rdp_write_reg(const u8 reg, const u32 value)
+{
+	__raw_writel(value, REG_BASE + reg);
+}
+
+#undef REG_BASE
+
+static const u32 ntsc_320[] __initconst = {
+	0x00013212, 0x00000000, 0x00000140, 0x00000200,
+	0x00000000, 0x03e52239, 0x0000020d, 0x00000c15,
+	0x0c150c15, 0x006c02ec, 0x002501ff, 0x000e0204,
+	0x00000200, 0x00000400
+};
+
+static int __init n64_platform_init(void)
+{
+	static const char simplefb_resname[] = "FB";
+	static const struct simplefb_platform_data mode = {
+		.width = W,
+		.height = H,
+		.stride = W * 2,
+		.format = "r5g5b5a1"
+	};
+	struct resource res;
+	void *orig;
+	unsigned long phys;
+	unsigned i;
+
+	platform_device_register_simple("n64audio", -1, NULL, 0);
+
+	/* The framebuffer needs 64-byte alignment */
+	orig = kzalloc(W * H * 2 + 63, GFP_DMA | GFP_KERNEL);
+	if (!orig)
+		return -ENOMEM;
+	phys = virt_to_phys(orig);
+	phys += 63;
+	phys &= ~63;
+
+	for (i = 0; i < ARRAY_SIZE(ntsc_320); i++) {
+		if (i == 1)
+			n64rdp_write_reg(i, phys);
+		else
+			n64rdp_write_reg(i, ntsc_320[i]);
+	}
+
+	/* setup IORESOURCE_MEM as framebuffer memory */
+	memset(&res, 0, sizeof(res));
+	res.flags = IORESOURCE_MEM;
+	res.name = simplefb_resname;
+	res.start = phys;
+	res.end = phys + W * H * 2 - 1;
+
+	platform_device_register_resndata(NULL, "simple-framebuffer", 0,
+					  &res, 1, &mode, sizeof(mode));
+
+	return 0;
+}
+
+#undef W
+#undef H
+
+arch_initcall(n64_platform_init);
+
+void __init plat_mem_setup(void)
+{
+	iomem_resource_init();
+	memblock_add(0x0, 8 * 1024 * 1024); /* Bootloader blocks the 4mb config */
+}
+
+void __init plat_time_init(void)
+{
+	/* 93.75 MHz cpu, count register runs at half rate */
+	mips_hpt_frequency = 93750000 / 2;
+}
diff --git a/arch/mips/n64/irq.c b/arch/mips/n64/irq.c
new file mode 100644
index 0000000..9f833cb
--- /dev/null
+++ b/arch/mips/n64/irq.c
@@ -0,0 +1,16 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  N64 IRQ
+ *
+ *  Copyright (C) 2020 Lauri Kasanen
+ */
+#include <linux/export.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+
+#include <asm/irq_cpu.h>
+
+void __init arch_init_irq(void)
+{
+	mips_cpu_irq_init();
+}