mips: Add N64 machine type

Add support for the Nintendo 64.

Signed-off-by: Lauri Kasanen <cand@gmx.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

diff --git a/arch/mips/Kbuild.platforms b/arch/mips/Kbuild.platforms
index 5483e38..e4f6e49 100644 (file)
--- 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 fc37ec0..5d68409 100644 (file)
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -607,6 +607,18 @@ 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 (file)
index 0000000..7e260fc
--- /dev/null
+++ b/arch/mips/include/asm/mach-n64/irq.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_MACH_N64_IRQ_H
+#define __ASM_MACH_N64_IRQ_H
+
+#define NR_IRQS 8
+
+#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 (file)
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 (file)
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 (file)
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 (file)
index 0000000..dfbd864
--- /dev/null
+++ b/arch/mips/n64/init.c
@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Nintendo 64 init.
+ *
+ *  Copyright (C) 2021 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
+
+/*
+ * 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)
+
+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
+};
+
+#define MI_REG_BASE 0x4300000
+#define NUM_MI_REGS 4
+#define AI_REG_BASE 0x4500000
+#define NUM_AI_REGS 6
+#define PI_REG_BASE 0x4600000
+#define NUM_PI_REGS 5
+#define SI_REG_BASE 0x4800000
+#define NUM_SI_REGS 7
+
+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[3];
+       void *orig;
+       unsigned long phys;
+       unsigned i;
+
+       memset(res, 0, sizeof(struct resource) * 3);
+       res[0].flags = IORESOURCE_MEM;
+       res[0].start = MI_REG_BASE;
+       res[0].end = MI_REG_BASE + NUM_MI_REGS * 4 - 1;
+
+       res[1].flags = IORESOURCE_MEM;
+       res[1].start = AI_REG_BASE;
+       res[1].end = AI_REG_BASE + NUM_AI_REGS * 4 - 1;
+
+       res[2].flags = IORESOURCE_IRQ;
+       res[2].start = RCP_IRQ;
+       res[2].end = RCP_IRQ;
+
+       platform_device_register_simple("n64audio", -1, res, 3);
+
+       memset(&res[0], 0, sizeof(res[0]));
+       res[0].flags = IORESOURCE_MEM;
+       res[0].start = PI_REG_BASE;
+       res[0].end = PI_REG_BASE + NUM_PI_REGS * 4 - 1;
+
+       platform_device_register_simple("n64cart", -1, res, 1);
+
+       memset(&res[0], 0, sizeof(res[0]));
+       res[0].flags = IORESOURCE_MEM;
+       res[0].start = SI_REG_BASE;
+       res[0].end = SI_REG_BASE + NUM_SI_REGS * 4 - 1;
+
+       platform_device_register_simple("n64joy", -1, res, 1);
+
+       /* 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], 0, sizeof(res[0]));
+       res[0].flags = IORESOURCE_MEM;
+       res[0].name = simplefb_resname;
+       res[0].start = phys;
+       res[0].end = phys + W * H * 2 - 1;
+
+       platform_device_register_resndata(NULL, "simple-framebuffer", 0,
+                                         &res[0], 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 (file)
index 0000000..1861e96
--- /dev/null
+++ b/arch/mips/n64/irq.c
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  N64 IRQ
+ *
+ *  Copyright (C) 2021 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();
+}