[PATCH v7 0/9] Add virtio-mmio support to m68k virt machine

[PATCH v7 0/9] Add virtio-mmio support to m68k virt machine

[Daniel Palmer]

Lets start making the m68k virt machine support useful.

First we need to fix some m68k endian issues.

Then allow virtio mmio driver instances to be created with
platform data and fix a minor endian issue.

Finally, add the code for the board to create the instances.

v7:
 - An extra patch is added before changing the qemu sysreset driver
   to use __raw_writel() to fix issues with versions of writel()/__raw_writel()
   that don't cast the address to a pointer.
 - Hopefully this fixes all of the CI issues. I have tested locally by building
   a few different targets with allyesconfig. A github pipeline passed with this
   patch and its running again now since I rebase and force pushed.

v6:
  - Remove an extra signed-of-by that go added by b4 or me somehow.
  - Fix the warning about a phys_addr_t being cast to a pointer of different
    size if phys_addr_t is 32bits but the target cpu is 64bits.

  CC      drivers/virtio/virtio_mmio.o
drivers/virtio/virtio_mmio.c: In function ‘virtio_mmio_probe’:
drivers/virtio/virtio_mmio.c:359:22: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  359 |         priv->base = (void __iomem *)plat->base;
      |

v5:
  - Add Kuan-Wei's fixes for the two other goldfish endian issues
    I hadn't spotted. Should be good to go!

v4:
  - Small changes to "board: qemu: m68k: Create virtio mmio instances"
    requested by Simon.
  - Add another patch to make the virtio cmd depend on CONFIG_VIRTIO_BLK
    as the build breaks if it isn't selected.

v3:
  - Fix the bug with the vendor string in virtio-blk properly,
    this removes the last endian hack in virtio-mmio
  - Leave the current behaviour for readl() for coldfire as it
    breaks thing.

v2:
  - Added patch to fix readl() etc on m68k, hopefully this
    doesn't break everything. This should match Linux now.
  - Added patch to fix sys reset which is broken by the above
  - Hacks to virtio-mmio are gone because they aren't needed
    anymore, just one minor endian fix now.
  - Removed RFC because it looks good to me*.


* I wouldn't trust me. :)

Daniel Palmer (7):
  sysreset: qemu virt: Use map_sysmem()
  sysreset: qemu virt: Use __raw_writel()
  m68k: Fix writew(), writel(), readw(), readl() endianness for classic
    m68k
  virtio: mmio: Allow instantiation via platform data
  virtio: cmd: Depend on VIRTIO_BLK
  virtio: blk: Fix converting the vendor id to a string
  board: qemu: m68k: Create virtio mmio instances

Kuan-Wei Chiu (2):
  rtc: goldfish: Use __raw_readl() and __raw_writel()
  timer: goldfish: Use __raw_readl()

 arch/m68k/Kconfig                          | 14 ++++---
 arch/m68k/include/asm/io.h                 | 31 +++++++++------
 board/emulation/qemu-m68k/qemu-m68k.c      | 45 ++++++++++++++++++++++
 cmd/Kconfig                                |  4 +-
 drivers/rtc/goldfish_rtc.c                 |  8 ++--
 drivers/sysreset/sysreset_qemu_virt_ctrl.c |  4 +-
 drivers/timer/goldfish_timer.c             |  4 +-
 drivers/virtio/virtio_blk.c                | 11 ++----
 drivers/virtio/virtio_mmio.c               | 27 ++++++++-----
 include/virtio.h                           |  3 ++
 include/virtio_mmio.h                      | 12 ++++++
 11 files changed, 121 insertions(+), 42 deletions(-)
 create mode 100644 include/virtio_mmio.h

-- 
2.53.0

[PATCH v7 1/9] sysreset: qemu virt: Use map_sysmem()

[Daniel Palmer]

In the platform data there is a phys_addr_t (an integer) for the address
of the register and we pass that as-is into writel() which is fine in most
places because we don't need to do any mapping and the macro for writel()
does a cast to a pointer.

If writel() is a static inline function the address argument is a pointer
so passing it in as an integer without casting it first causes warnings or
build failure.

map_sysmem() handles the casting part and if phys_addr_t is 32bits when
on a 64bit machine.

Signed-off-by: Daniel Palmer <daniel@thingy.jp>
---
 drivers/sysreset/sysreset_qemu_virt_ctrl.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/sysreset/sysreset_qemu_virt_ctrl.c b/drivers/sysreset/sysreset_qemu_virt_ctrl.c
index e7cacc9b6e98..61b38d507fc5 100644
--- a/drivers/sysreset/sysreset_qemu_virt_ctrl.c
+++ b/drivers/sysreset/sysreset_qemu_virt_ctrl.c
@@ -8,6 +8,7 @@
 #include <dm.h>
 #include <qemu_virt_ctrl.h>
 #include <sysreset.h>
+#include <mapmem.h>
 #include <asm/io.h>
 #include <linux/err.h>
 
@@ -24,6 +25,7 @@
 static int qemu_virt_ctrl_request(struct udevice *dev, enum sysreset_t type)
 {
 	struct qemu_virt_ctrl_plat *plat = dev_get_plat(dev);
+	void __iomem *reg = map_sysmem(plat->reg + VIRT_CTRL_REG_CMD, 0x4);
 	u32 val;
 
 	switch (type) {
@@ -38,7 +40,7 @@ static int qemu_virt_ctrl_request(struct udevice *dev, enum sysreset_t type)
 		return -EPROTONOSUPPORT;
 	}
 
-	writel(val, plat->reg + VIRT_CTRL_REG_CMD);
+	writel(val, reg);
 
 	return -EINPROGRESS;
 }
-- 
2.53.0

Re: [PATCH v7 1/9] sysreset: qemu virt: Use map_sysmem()

[Kuan-Wei Chiu]

On Sat, May 16, 2026 at 04:39:53PM +0900, Daniel Palmer wrote:
> In the platform data there is a phys_addr_t (an integer) for the address
> of the register and we pass that as-is into writel() which is fine in most
> places because we don't need to do any mapping and the macro for writel()
> does a cast to a pointer.
> 
> If writel() is a static inline function the address argument is a pointer
> so passing it in as an integer without casting it first causes warnings or
> build failure.
> 
> map_sysmem() handles the casting part and if phys_addr_t is 32bits when
> on a 64bit machine.
> 
> Signed-off-by: Daniel Palmer <daniel@thingy.jp>

Acked-by: Kuan-Wei Chiu <visitorckw@gmail.com>

> ---
>  drivers/sysreset/sysreset_qemu_virt_ctrl.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/sysreset/sysreset_qemu_virt_ctrl.c b/drivers/sysreset/sysreset_qemu_virt_ctrl.c
> index e7cacc9b6e98..61b38d507fc5 100644
> --- a/drivers/sysreset/sysreset_qemu_virt_ctrl.c
> +++ b/drivers/sysreset/sysreset_qemu_virt_ctrl.c
> @@ -8,6 +8,7 @@
>  #include <dm.h>
>  #include <qemu_virt_ctrl.h>
>  #include <sysreset.h>
> +#include <mapmem.h>
>  #include <asm/io.h>
>  #include <linux/err.h>
>  
> @@ -24,6 +25,7 @@
>  static int qemu_virt_ctrl_request(struct udevice *dev, enum sysreset_t type)
>  {
>  	struct qemu_virt_ctrl_plat *plat = dev_get_plat(dev);
> +	void __iomem *reg = map_sysmem(plat->reg + VIRT_CTRL_REG_CMD, 0x4);
>  	u32 val;
>  
>  	switch (type) {
> @@ -38,7 +40,7 @@ static int qemu_virt_ctrl_request(struct udevice *dev, enum sysreset_t type)
>  		return -EPROTONOSUPPORT;
>  	}
>  
> -	writel(val, plat->reg + VIRT_CTRL_REG_CMD);
> +	writel(val, reg);
>  
>  	return -EINPROGRESS;
>  }
> -- 
> 2.53.0
> 

[PATCH v7 2/9] sysreset: qemu virt: Use __raw_writel()

[Daniel Palmer]

The virt ctrl register seems to be native endian, currently this driver
uses writel(), which works by luck because its currently broken on m68k.

Use __raw_writel() instead to avoid breaking this driver when the
endianness of writel() is fixed.

Acked-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Reviewed-by: Angelo Dureghello <angelo@kernel-space.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Daniel Palmer <daniel@thingy.jp>
---
 drivers/sysreset/sysreset_qemu_virt_ctrl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/sysreset/sysreset_qemu_virt_ctrl.c b/drivers/sysreset/sysreset_qemu_virt_ctrl.c
index 61b38d507fc5..ce15e776f8fa 100644
--- a/drivers/sysreset/sysreset_qemu_virt_ctrl.c
+++ b/drivers/sysreset/sysreset_qemu_virt_ctrl.c
@@ -40,7 +40,7 @@ static int qemu_virt_ctrl_request(struct udevice *dev, enum sysreset_t type)
 		return -EPROTONOSUPPORT;
 	}
 
-	writel(val, reg);
+	__raw_writel(val, reg);
 
 	return -EINPROGRESS;
 }
-- 
2.53.0

[PATCH v7 3/9] rtc: goldfish: Use __raw_readl() and __raw_writel()

[Daniel Palmer]

From: Kuan-Wei Chiu <visitorckw@gmail.com>

In QEMU, the Goldfish RTC is explicitly instantiated as a big-endian
device on the m68k virt machine (via the 'big-endian=true' property).
Currently, this driver uses ioread32() and iowrite32(), which works
by luck because the underlying readl() and writel() are currently
broken on m68k.

Use __raw_readl() and __raw_writel() instead to avoid breaking this
driver when the endianness of readl() and writel() is fixed.

Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Tested-by: Daniel Palmer <daniel@thingy.jp>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Daniel Palmer <daniel@thingy.jp>
---
 drivers/rtc/goldfish_rtc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/rtc/goldfish_rtc.c b/drivers/rtc/goldfish_rtc.c
index d2991ca67192..4892a63f8d80 100644
--- a/drivers/rtc/goldfish_rtc.c
+++ b/drivers/rtc/goldfish_rtc.c
@@ -40,8 +40,8 @@ static int goldfish_rtc_get(struct udevice *dev, struct rtc_time *time)
 	u64 time_low;
 	u64 now;
 
-	time_low = ioread32(base + GOLDFISH_TIME_LOW);
-	time_high = ioread32(base + GOLDFISH_TIME_HIGH);
+	time_low = __raw_readl(base + GOLDFISH_TIME_LOW);
+	time_high = __raw_readl(base + GOLDFISH_TIME_HIGH);
 	now = (time_high << 32) | time_low;
 
 	do_div(now, 1000000000U);
@@ -62,8 +62,8 @@ static int goldfish_rtc_set(struct udevice *dev, const struct rtc_time *time)
 		return -EINVAL;
 
 	now = rtc_mktime(time) * 1000000000ULL;
-	iowrite32(now >> 32, base + GOLDFISH_TIME_HIGH);
-	iowrite32(now, base + GOLDFISH_TIME_LOW);
+	__raw_writel(now >> 32, base + GOLDFISH_TIME_HIGH);
+	__raw_writel(now, base + GOLDFISH_TIME_LOW);
 
 	if (time->tm_isdst > 0)
 		priv->isdst = 1;
-- 
2.53.0

[PATCH v7 4/9] timer: goldfish: Use __raw_readl()

[Daniel Palmer]

From: Kuan-Wei Chiu <visitorckw@gmail.com>

The Goldfish timer registers are native endian, so they act as
big-endian on the m68k virt machine. Currently, this driver uses
readl(), which works by luck because it's currently broken on m68k.

Use __raw_readl() instead to avoid breaking this driver when the
endianness of readl() is fixed.

Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Tested-by: Daniel Palmer <daniel@thingy.jp>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Daniel Palmer <daniel@thingy.jp>
---
 drivers/timer/goldfish_timer.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/timer/goldfish_timer.c b/drivers/timer/goldfish_timer.c
index 70673bbd93c2..91277d7932ac 100644
--- a/drivers/timer/goldfish_timer.c
+++ b/drivers/timer/goldfish_timer.c
@@ -31,8 +31,8 @@ static u64 goldfish_timer_get_count(struct udevice *dev)
 	 * We must read LOW before HIGH to latch the high 32-bit value
 	 * and ensure a consistent 64-bit timestamp.
 	 */
-	low = readl(priv->base + TIMER_TIME_LOW);
-	high = readl(priv->base + TIMER_TIME_HIGH);
+	low = __raw_readl(priv->base + TIMER_TIME_LOW);
+	high = __raw_readl(priv->base + TIMER_TIME_HIGH);
 
 	time = ((u64)high << 32) | low;
 
-- 
2.53.0

[PATCH v7 5/9] m68k: Fix writew(), writel(), readw(), readl() endianness for classic m68k

[Daniel Palmer]

In Linux these are meant to read a little-endian value and swap
to the CPU endian.

In u-boot for m68k this is currently broken and prevents
virtio-mmio from functioning.

This change is only for classic m68k. Coldfire has read big-endian,
no swap for these in u-boot and Linux and existing drivers probably
depend on this.

Tested-by: Angelo Dureghello <angelo@kernel-space.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Acked-by: Angelo Dureghello <angelo@kernel-space.org>
Signed-off-by: Daniel Palmer <daniel@thingy.jp>
---
 arch/m68k/include/asm/io.h | 31 ++++++++++++++++++++-----------
 1 file changed, 20 insertions(+), 11 deletions(-)

diff --git a/arch/m68k/include/asm/io.h b/arch/m68k/include/asm/io.h
index 35ad4a1c0444..2577081d8363 100644
--- a/arch/m68k/include/asm/io.h
+++ b/arch/m68k/include/asm/io.h
@@ -23,18 +23,27 @@
 #define __raw_writew(w,addr) ((*(volatile u16 *) (addr)) = (w))
 #define __raw_writel(l,addr) ((*(volatile u32 *) (addr)) = (l))
 
-#define readb(addr)		in_8((volatile u8 *)(addr))
-#define writeb(b,addr)		out_8((volatile u8 *)(addr), (b))
-#if !defined(__BIG_ENDIAN)
-#define readw(addr)		(*(volatile u16 *) (addr))
-#define readl(addr)		(*(volatile u32 *) (addr))
-#define writew(b,addr)		((*(volatile u16 *) (addr)) = (b))
-#define writel(b,addr)		((*(volatile u32 *) (addr)) = (b))
+#define readb(addr)	in_8((volatile u8 *)(addr))
+#define writeb(b, addr)	out_8((volatile u8 *)(addr), (b))
+#ifdef CONFIG_M680x0
+/*
+ * For classic m68k these work the same way as Linux:
+ * Read a little endian value, swap to the CPU endian.
+ */
+#define readw(addr)	in_le16((volatile u16 *)(addr))
+#define readl(addr)	in_le32((volatile u32 *)(addr))
+#define writew(b, addr)	out_le16((volatile u16 *)(addr), (b))
+#define writel(b, addr)	out_le32((volatile u32 *)(addr), (b))
 #else
-#define readw(addr)		in_be16((volatile u16 *)(addr))
-#define readl(addr)		in_be32((volatile u32 *)(addr))
-#define writew(b,addr)		out_be16((volatile u16 *)(addr),(b))
-#define writel(b,addr)		out_be32((volatile u32 *)(addr),(b))
+/*
+ * For coldfire these read a big endian value and use it
+ * as-is. This means that for little endian devices on the
+ * bus like PCI device these won't work as expected currently.
+ */
+#define readw(addr)	in_be16((volatile u16 *)(addr))
+#define readl(addr)	in_be32((volatile u32 *)(addr))
+#define writew(b, addr)	out_be16((volatile u16 *)(addr), (b))
+#define writel(b, addr)	out_be32((volatile u32 *)(addr), (b))
 #endif
 
 /*
-- 
2.53.0

[PATCH v7 6/9] virtio: mmio: Allow instantiation via platform data

[Daniel Palmer]

The m68k QEMU virt machine doesn't use devicetree, yet, so
allow it to create virtio-mmio instances via platform data.

Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Reviewed-by: Angelo Dureghello <angelo@kernel-space.org>
Signed-off-by: Daniel Palmer <daniel@thingy.jp>
---
 drivers/virtio/virtio_mmio.c | 27 ++++++++++++++++++---------
 include/virtio_mmio.h        | 12 ++++++++++++
 2 files changed, 30 insertions(+), 9 deletions(-)
 create mode 100644 include/virtio_mmio.h

diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index d90d8309f991..975f98cd9e5b 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -12,6 +12,7 @@
 #include <virtio_types.h>
 #include <virtio.h>
 #include <virtio_ring.h>
+#include <virtio_mmio.h>
 #include <linux/bug.h>
 #include <linux/compat.h>
 #include <linux/err.h>
@@ -335,21 +336,28 @@ static int virtio_mmio_notify(struct udevice *udev, struct virtqueue *vq)
 
 static int virtio_mmio_of_to_plat(struct udevice *udev)
 {
-	struct virtio_mmio_priv *priv = dev_get_priv(udev);
+	struct virtio_mmio_plat *plat = dev_get_plat(udev);
+	fdt_addr_t addr;
+
+	addr = dev_read_addr(udev);
 
-	priv->base = (void __iomem *)(ulong)dev_read_addr(udev);
-	if (priv->base == (void __iomem *)FDT_ADDR_T_NONE)
+	if (addr == FDT_ADDR_T_NONE)
 		return -EINVAL;
 
+	plat->base = addr;
+
 	return 0;
 }
 
 static int virtio_mmio_probe(struct udevice *udev)
 {
+	struct virtio_mmio_plat *plat = dev_get_plat(udev);
 	struct virtio_mmio_priv *priv = dev_get_priv(udev);
 	struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(udev);
 	u32 magic;
 
+	priv->base = (void __iomem *)(uintptr_t)plat->base;
+
 	/* Check magic value */
 	magic = readl(priv->base + VIRTIO_MMIO_MAGIC_VALUE);
 	if (magic != ('v' | 'i' << 8 | 'r' << 16 | 't' << 24)) {
@@ -405,11 +413,12 @@ static const struct udevice_id virtio_mmio_ids[] = {
 };
 
 U_BOOT_DRIVER(virtio_mmio) = {
-	.name	= "virtio-mmio",
-	.id	= UCLASS_VIRTIO,
-	.of_match = virtio_mmio_ids,
-	.ops	= &virtio_mmio_ops,
-	.probe	= virtio_mmio_probe,
+	.name       = "virtio-mmio",
+	.id         = UCLASS_VIRTIO,
+	.of_match   = virtio_mmio_ids,
+	.ops        = &virtio_mmio_ops,
+	.probe      = virtio_mmio_probe,
 	.of_to_plat = virtio_mmio_of_to_plat,
-	.priv_auto	= sizeof(struct virtio_mmio_priv),
+	.priv_auto  = sizeof(struct virtio_mmio_priv),
+	.plat_auto  = sizeof(struct virtio_mmio_plat),
 };
diff --git a/include/virtio_mmio.h b/include/virtio_mmio.h
new file mode 100644
index 000000000000..8c072826db55
--- /dev/null
+++ b/include/virtio_mmio.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+#ifndef __VIRTIO_MMIO_H__
+#define __VIRTIO_MMIO_H__
+
+#include <linux/types.h>
+
+struct virtio_mmio_plat {
+	phys_addr_t base;
+};
+
+#endif /* __VIRTIO_MMIO_H__ */
-- 
2.53.0

[PATCH v7 7/9] virtio: cmd: Depend on VIRTIO_BLK

[Daniel Palmer]

The virtio command is calling virtio blk functions but currently
depends on CONFIG_VIRTIO only. This means disabling CONFIG_VIRTIO_BLK
causes the final link to fail.

Since CONFIG_VIRTIO_BLK depends on CONFIG_VIRTIO switch to depending
on just CONFIG_VIRTIO_BLK

Reviewed-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Reviewed-by: Angelo Dureghello <angelo@kernel-space.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Daniel Palmer <daniel@thingy.jp>
---
 cmd/Kconfig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/cmd/Kconfig b/cmd/Kconfig
index c71c6824a196..032e55e81276 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1871,8 +1871,8 @@ config CMD_PVBLOCK
 
 config CMD_VIRTIO
 	bool "virtio"
-	depends on VIRTIO
-	default y if VIRTIO
+	depends on VIRTIO_BLK
+	default y if VIRTIO_BLK
 	help
 	  VirtIO block device support
 
-- 
2.53.0

[PATCH v7 8/9] virtio: blk: Fix converting the vendor id to a string

[Daniel Palmer]

Currently we are trying to work out if the vendor id is from
a virtio-mmio device and then casting a u32 to a char* and using
it as a C-string. By chance there is usually a zero after the u32
and it works.

Since the vendor id we are trying to convert to a string is QEMU's
just define a value for the QEMU vendor id, check if the vendor
id matches and then use a predefined string for "QEMU".

I don't think we should have been assumming all virtio-mmio vendor
ids are printable ASCII chars in the first place so do this special
casing just for QEMU. If the vendor id isn't QEMU print the hex
value of it.

Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Signed-off-by: Daniel Palmer <daniel@thingy.jp>
---
 drivers/virtio/virtio_blk.c | 11 ++++-------
 include/virtio.h            |  3 +++
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/virtio/virtio_blk.c b/drivers/virtio/virtio_blk.c
index 7b1d891cdcbb..404d9140cb2b 100644
--- a/drivers/virtio/virtio_blk.c
+++ b/drivers/virtio/virtio_blk.c
@@ -232,14 +232,11 @@ static int virtio_blk_bind(struct udevice *dev)
 		return devnum;
 	desc->devnum = devnum;
 	desc->part_type = PART_TYPE_UNKNOWN;
-	/*
-	 * virtio mmio transport supplies string identification for us,
-	 * while pci trnasport uses a 2-byte subvendor value.
-	 */
-	if (uc_priv->vendor >> 16)
-		sprintf(desc->vendor, "%s", (char *)&uc_priv->vendor);
+
+	if (uc_priv->vendor == VIRTIO_VENDOR_QEMU)
+		strcpy(desc->vendor, "QEMU");
 	else
-		sprintf(desc->vendor, "%04x", uc_priv->vendor);
+		sprintf(desc->vendor, "%08x", uc_priv->vendor);
 	desc->bdev = dev;
 
 	/* Indicate what driver features we support */
diff --git a/include/virtio.h b/include/virtio.h
index 17f894a79e31..3edf023463d7 100644
--- a/include/virtio.h
+++ b/include/virtio.h
@@ -25,6 +25,9 @@
 #include <linux/bitops.h>
 #include <linux/bug.h>
 #include <linux/typecheck.h>
+
+#define VIRTIO_VENDOR_QEMU	0x554d4551
+
 #define VIRTIO_ID_NET		1 /* virtio net */
 #define VIRTIO_ID_BLOCK		2 /* virtio block */
 #define VIRTIO_ID_RNG		4 /* virtio rng */
-- 
2.53.0

[PATCH v7 9/9] board: qemu: m68k: Create virtio mmio instances

[Daniel Palmer]

So that you can use virtio network, block etc create the virtio mmio
instances. There are 128 of these even if they are not all used, a
single mmio base value is passed via bootinfo.

Reviewed-by: Angelo Dureghello <angelo@kernel-space.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Tested-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Signed-off-by: Daniel Palmer <daniel@thingy.jp>
---
 arch/m68k/Kconfig                     | 14 +++++----
 board/emulation/qemu-m68k/qemu-m68k.c | 45 +++++++++++++++++++++++++++
 2 files changed, 53 insertions(+), 6 deletions(-)

diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 00e89bd0a625..8bebf0ea3e13 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -196,12 +196,14 @@ config TARGET_STMARK2
         select M54418
 
 config TARGET_QEMU_M68K
-    bool "Support QEMU m68k virt"
-    select M68040
-    imply CMD_DM
-    help
-      This target supports the QEMU m68k virtual machine (-M virt).
-      It simulates a Motorola 68040 CPU with Goldfish peripherals.
+	bool "Support QEMU m68k virt"
+	select M68040
+	select BOARD_EARLY_INIT_R
+	select VIRTIO_MMIO
+	imply CMD_DM
+	help
+	  This target supports the QEMU m68k virtual machine (-M virt).
+	  It simulates a Motorola 68040 CPU with Goldfish peripherals.
 
 endchoice
 
diff --git a/board/emulation/qemu-m68k/qemu-m68k.c b/board/emulation/qemu-m68k/qemu-m68k.c
index d3527aee1128..a19b23a28ce3 100644
--- a/board/emulation/qemu-m68k/qemu-m68k.c
+++ b/board/emulation/qemu-m68k/qemu-m68k.c
@@ -14,9 +14,14 @@
 #include <asm/bootinfo.h>
 #include <asm/global_data.h>
 #include <asm/io.h>
+#include <dm.h>
+#include <dm/device-internal.h>
+#include <dm/lists.h>
 #include <dm/platdata.h>
+#include <dm/root.h>
 #include <linux/errno.h>
 #include <linux/sizes.h>
+#include <virtio_mmio.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -25,6 +30,38 @@ static struct goldfish_rtc_plat rtc_plat;
 static struct goldfish_timer_plat timer_plat;
 static struct qemu_virt_ctrl_plat reset_plat;
 
+#define VIRTIO_MMIO_NUM	128
+#define VIRTIO_MMIO_SZ	0x200
+
+static struct virtio_mmio_plat virtio_mmio_plat[VIRTIO_MMIO_NUM];
+static char virtio_mmio_names[VIRTIO_MMIO_NUM][11];
+static phys_addr_t virtio_mmio_base;
+
+static int create_virtio_mmios(void)
+{
+	struct driver *drv;
+	int i, ret;
+
+	if (!virtio_mmio_base)
+		return -ENODEV;
+
+	drv = lists_driver_lookup_name("virtio-mmio");
+	if (!drv)
+		return -ENOENT;
+
+	for (i = 0; i < VIRTIO_MMIO_NUM; i++) {
+		virtio_mmio_plat[i].base = virtio_mmio_base + (VIRTIO_MMIO_SZ * i);
+		sprintf(virtio_mmio_names[i], "virtio-%d", i);
+
+		ret = device_bind(dm_root(), drv, virtio_mmio_names[i],
+				  &virtio_mmio_plat[i], ofnode_null(), NULL);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 /*
  * Theoretical limit derivation:
  * Max Bootinfo Size (Standard Page) = 4096 bytes
@@ -65,6 +102,9 @@ static void parse_bootinfo(void)
 		case BI_VIRT_CTRL_BASE:
 			reset_plat.reg = base;
 			break;
+		case BI_VIRT_VIRTIO_BASE:
+			virtio_mmio_base = base;
+			break;
 		case BI_MEMCHUNK:
 			gd->ram_size = record->data[1];
 			break;
@@ -80,6 +120,11 @@ int board_early_init_f(void)
 	return 0;
 }
 
+int board_early_init_r(void)
+{
+	return create_virtio_mmios();
+}
+
 int checkboard(void)
 {
 	puts("Board: QEMU m68k virt\n");
-- 
2.53.0

Re: [PATCH v7 0/9] Add virtio-mmio support to m68k virt machine

[Tom Rini]

On Sat, 16 May 2026 16:39:52 +0900, Daniel Palmer wrote:

> Lets start making the m68k virt machine support useful.
> 
> First we need to fix some m68k endian issues.
> 
> Then allow virtio mmio driver instances to be created with
> platform data and fix a minor endian issue.
> 
> [...]

Applied to u-boot/next, thanks!

[1/9] sysreset: qemu virt: Use map_sysmem()
      commit: ccec4ce2ee8ae7c95a00b16da0b5dbd88615a8e2
[2/9] sysreset: qemu virt: Use __raw_writel()
      commit: 0bcd158db30aa14aa6add56060626388079c50cf
[3/9] rtc: goldfish: Use __raw_readl() and __raw_writel()
      commit: 5116fed77dee99a513f17f18be0dbf2e63363eef
[4/9] timer: goldfish: Use __raw_readl()
      commit: 75a1d7280a72d587d54b6af653234a96210f7177
[5/9] m68k: Fix writew(), writel(), readw(), readl() endianness for classic m68k
      commit: 3e2b261647a78929f494a932fad4e80e607a2fef
[6/9] virtio: mmio: Allow instantiation via platform data
      commit: 009cd5b56dbc2d0f7675e4262347a1a6b6a55cb2
[7/9] virtio: cmd: Depend on VIRTIO_BLK
      commit: b781017fb63831abac4bb6956e83595f5cb8c428
[8/9] virtio: blk: Fix converting the vendor id to a string
      commit: ddba15ab72df5a01fd483a0f4fc40f9ae4d2475c
[9/9] board: qemu: m68k: Create virtio mmio instances
      commit: 3dc2761d6347c35fe15fef64592d20946396872d
-- 
Tom