m68k: Introduce a virtual m68k machine

This machine allows to have up to 3.2 GiB and 128 Virtio devices.

It is based on android goldfish devices.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Link: https://lore.kernel.org/r/20220406201523.243733-5-laurent@vivier.eu
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

8 files changed, 92 insertions, 11 deletions

diff --git a/arch/m68k/include/asm/config.h b/arch/m68k/include/asm/config.h
index e73ffa23c4f5..9bb888ab5009 100644
--- a/arch/m68k/include/asm/config.h
+++ b/arch/m68k/include/asm/config.h
@@ -17,6 +17,7 @@ extern int mac_parse_bootinfo(const struct bi_record *record);
 extern int mvme147_parse_bootinfo(const struct bi_record *record);
 extern int mvme16x_parse_bootinfo(const struct bi_record *record);
 extern int q40_parse_bootinfo(const struct bi_record *record);
+extern int virt_parse_bootinfo(const struct bi_record *record);
 
 extern void config_amiga(void);
 extern void config_apollo(void);
@@ -29,5 +30,6 @@ extern void config_mvme16x(void);
 extern void config_q40(void);
 extern void config_sun3(void);
 extern void config_sun3x(void);
+extern void config_virt(void);
 
 #endif /* _M68K_CONFIG_H */
diff --git a/arch/m68k/include/asm/io.h b/arch/m68k/include/asm/io.h
index aabe6420ead2..aaeabc65e63c 100644
--- a/arch/m68k/include/asm/io.h
+++ b/arch/m68k/include/asm/io.h
@@ -8,6 +8,9 @@
 #include <asm/io_mm.h>
 #endif
 
+#define gf_ioread32 ioread32be
+#define gf_iowrite32 iowrite32be
+
 #include <asm-generic/io.h>
 
 #endif /* _M68K_IO_H */
diff --git a/arch/m68k/include/asm/irq.h b/arch/m68k/include/asm/irq.h
index 91dd493791d7..7829e955ca04 100644
--- a/arch/m68k/include/asm/irq.h
+++ b/arch/m68k/include/asm/irq.h
@@ -12,7 +12,8 @@
  */
 #if defined(CONFIG_COLDFIRE)
 #define NR_IRQS 256
-#elif defined(CONFIG_VME) || defined(CONFIG_SUN3) || defined(CONFIG_SUN3X)
+#elif defined(CONFIG_VME) || defined(CONFIG_SUN3) || \
+      defined(CONFIG_SUN3X) || defined(CONFIG_VIRT)
 #define NR_IRQS 200
 #elif defined(CONFIG_ATARI)
 #define NR_IRQS 141
diff --git a/arch/m68k/include/asm/pgtable_mm.h b/arch/m68k/include/asm/pgtable_mm.h
index 143ba7de9bda..9b4e2fe2ac82 100644
--- a/arch/m68k/include/asm/pgtable_mm.h
+++ b/arch/m68k/include/asm/pgtable_mm.h
@@ -80,6 +80,9 @@
 #elif defined(CONFIG_COLDFIRE)
 #define KMAP_START	0xe0000000
 #define KMAP_END	0xf0000000
+#elif defined(CONFIG_VIRT)
+#define	KMAP_START	0xdf000000
+#define	KMAP_END	0xff000000
 #else
 #define	KMAP_START	0xd0000000
 #define	KMAP_END	0xf0000000
@@ -92,6 +95,10 @@ extern unsigned long m68k_vmalloc_end;
 #elif defined(CONFIG_COLDFIRE)
 #define VMALLOC_START	0xd0000000
 #define VMALLOC_END	0xe0000000
+#elif defined(CONFIG_VIRT)
+#define VMALLOC_OFFSET	PAGE_SIZE
+#define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
+#define VMALLOC_END     KMAP_START
 #else
 /* Just any arbitrary offset to the start of the vmalloc VM area: the
  * current 8MB value just means that there will be a 8MB "hole" after the
diff --git a/arch/m68k/include/asm/setup.h b/arch/m68k/include/asm/setup.h
index 8f2023f8c1c4..2c99477aaf89 100644
--- a/arch/m68k/include/asm/setup.h
+++ b/arch/m68k/include/asm/setup.h
@@ -37,7 +37,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_ATARI) || defined(CONFIG_MAC) || defined(CONFIG_APOLLO) \
 	|| defined(CONFIG_MVME16x) || defined(CONFIG_BVME6000)               \
 	|| defined(CONFIG_HP300) || defined(CONFIG_Q40)                      \
-	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)                  \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_AMIGA (m68k_machtype == MACH_AMIGA)
 #else
 #  define MACH_AMIGA_ONLY
@@ -50,7 +51,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_APOLLO) \
 	|| defined(CONFIG_MVME16x) || defined(CONFIG_BVME6000)               \
 	|| defined(CONFIG_HP300) || defined(CONFIG_Q40)                      \
-	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)                  \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_ATARI (m68k_machtype == MACH_ATARI)
 #else
 #  define MACH_ATARI_ONLY
@@ -63,7 +65,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_AMIGA) || defined(CONFIG_ATARI) || defined(CONFIG_APOLLO) \
 	|| defined(CONFIG_MVME16x) || defined(CONFIG_BVME6000)                 \
 	|| defined(CONFIG_HP300) || defined(CONFIG_Q40)                        \
-	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)                    \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_MAC (m68k_machtype == MACH_MAC)
 #else
 #  define MACH_MAC_ONLY
@@ -84,7 +87,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
 	|| defined(CONFIG_MVME16x) || defined(CONFIG_BVME6000)              \
 	|| defined(CONFIG_HP300) || defined(CONFIG_Q40)                     \
-	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)                 \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_APOLLO (m68k_machtype == MACH_APOLLO)
 #else
 #  define MACH_APOLLO_ONLY
@@ -97,7 +101,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
 	|| defined(CONFIG_APOLLO) || defined(CONFIG_BVME6000)               \
 	|| defined(CONFIG_HP300) || defined(CONFIG_Q40)                     \
-	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME16x)
+	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME16x)                 \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_MVME147 (m68k_machtype == MACH_MVME147)
 #else
 #  define MACH_MVME147_ONLY
@@ -110,7 +115,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
 	|| defined(CONFIG_APOLLO) || defined(CONFIG_BVME6000)               \
 	|| defined(CONFIG_HP300) || defined(CONFIG_Q40)                     \
-	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)                 \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_MVME16x (m68k_machtype == MACH_MVME16x)
 #else
 #  define MACH_MVME16x_ONLY
@@ -123,7 +129,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
 	|| defined(CONFIG_APOLLO) || defined(CONFIG_MVME16x)                \
 	|| defined(CONFIG_HP300) || defined(CONFIG_Q40)                     \
-	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)                 \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_BVME6000 (m68k_machtype == MACH_BVME6000)
 #else
 #  define MACH_BVME6000_ONLY
@@ -136,7 +143,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
 	|| defined(CONFIG_APOLLO) || defined(CONFIG_MVME16x) \
 	|| defined(CONFIG_BVME6000) || defined(CONFIG_Q40) \
-	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147) \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_HP300 (m68k_machtype == MACH_HP300)
 #else
 #  define MACH_HP300_ONLY
@@ -149,7 +157,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
 	|| defined(CONFIG_APOLLO) || defined(CONFIG_MVME16x)                \
 	|| defined(CONFIG_BVME6000) || defined(CONFIG_HP300)                \
-	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)
+	|| defined(CONFIG_SUN3X) || defined(CONFIG_MVME147)                 \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_Q40 (m68k_machtype == MACH_Q40)
 #else
 #  define MACH_Q40_ONLY
@@ -162,7 +171,8 @@ extern unsigned long m68k_machtype;
 #elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
 	|| defined(CONFIG_APOLLO) || defined(CONFIG_MVME16x)                \
 	|| defined(CONFIG_BVME6000) || defined(CONFIG_HP300)                \
-	|| defined(CONFIG_Q40) || defined(CONFIG_MVME147)
+	|| defined(CONFIG_Q40) || defined(CONFIG_MVME147)                   \
+	|| defined(CONFIG_VIRT)
 #  define MACH_IS_SUN3X (m68k_machtype == MACH_SUN3X)
 #else
 #  define CONFIG_SUN3X_ONLY
@@ -170,6 +180,20 @@ extern unsigned long m68k_machtype;
 #  define MACH_TYPE (MACH_SUN3X)
 #endif
 
+#if !defined(CONFIG_VIRT)
+#  define MACH_IS_VIRT (0)
+#elif defined(CONFIG_AMIGA) || defined(CONFIG_MAC) || defined(CONFIG_ATARI) \
+	|| defined(CONFIG_APOLLO) || defined(CONFIG_MVME16x)                \
+	|| defined(CONFIG_BVME6000) || defined(CONFIG_HP300)                \
+	|| defined(CONFIG_Q40) || defined(CONFIG_SUN3X)                     \
+	|| defined(CONFIG_MVME147)
+#  define MACH_IS_VIRT (m68k_machtype == MACH_VIRT)
+#else
+#  define MACH_VIRT_ONLY
+#  define MACH_IS_VIRT (1)
+#  define MACH_TYPE (MACH_VIRT)
+#endif
+
 #ifndef MACH_TYPE
 #  define MACH_TYPE (m68k_machtype)
 #endif
diff --git a/arch/m68k/include/asm/virt.h b/arch/m68k/include/asm/virt.h
new file mode 100644
index 000000000000..d3320c954796
--- /dev/null
+++ b/arch/m68k/include/asm/virt.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_VIRT_H
+#define __ASM_VIRT_H
+
+#define NUM_VIRT_SOURCES 200
+
+struct virt_booter_device_data {
+	u32 mmio;
+	u32 irq;
+};
+
+struct virt_booter_data {
+	u32 qemu_version;
+	struct virt_booter_device_data pic;
+	struct virt_booter_device_data rtc;
+	struct virt_booter_device_data tty;
+	struct virt_booter_device_data ctrl;
+	struct virt_booter_device_data virtio;
+};
+
+extern struct virt_booter_data virt_bi_data;
+
+extern void __init virt_init_IRQ(void);
+
+#endif
diff --git a/arch/m68k/include/uapi/asm/bootinfo-virt.h b/arch/m68k/include/uapi/asm/bootinfo-virt.h
new file mode 100644
index 000000000000..e4db7e2213ab
--- /dev/null
+++ b/arch/m68k/include/uapi/asm/bootinfo-virt.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * asm/bootinfo-virt.h -- Virtual-m68k-specific boot information definitions
+ */
+
+#ifndef _UAPI_ASM_M68K_BOOTINFO_VIRT_H
+#define _UAPI_ASM_M68K_BOOTINFO_VIRT_H
+
+#define BI_VIRT_QEMU_VERSION	0x8000
+#define BI_VIRT_GF_PIC_BASE	0x8001
+#define BI_VIRT_GF_RTC_BASE	0x8002
+#define BI_VIRT_GF_TTY_BASE	0x8003
+#define BI_VIRT_VIRTIO_BASE	0x8004
+#define BI_VIRT_CTRL_BASE	0x8005
+
+#define VIRT_BOOTI_VERSION	MK_BI_VERSION(2, 0)
+
+#endif /* _UAPI_ASM_M68K_BOOTINFO_MAC_H */
diff --git a/arch/m68k/include/uapi/asm/bootinfo.h b/arch/m68k/include/uapi/asm/bootinfo.h
index 38d3140381fa..203d9cbf9630 100644
--- a/arch/m68k/include/uapi/asm/bootinfo.h
+++ b/arch/m68k/include/uapi/asm/bootinfo.h
@@ -83,6 +83,7 @@ struct mem_info {
 #define MACH_SUN3X		11
 #define MACH_M54XX		12
 #define MACH_M5441X		13
+#define MACH_VIRT		14
 
 
     /*