Merge branch 'Amiga-xsurf100'

Michael Schmitz says:

====================
New network driver for Amiga X-Surf 100 (m68k)

[This is a resend of my v3 series which was based on the wrong version and
tree. Only substantial change is to Asix AX99796B PHY driver.]

This patch series adds support for the Individual Computers X-Surf 100
network card for m68k Amiga, a network adapter based on the AX88796 chip set.

The driver was originally written for kernel version 3.19 by Michael Karcher
(see CC:), and adapted to 4.16+ for submission to netdev by me. Questions
regarding motivation for some of the changes are probably best directed at
Michael Karcher.

The driver has been tested by Adrian <glaubitz@physik.fu-berlin.de> who will
send his Tested-by tag separately.

A few changes to the ax88796 driver were required:
- to read the MAC address, some setup of the ax99796 chip must be done,
- attach to the MII bus only on device open to allow module unloading,
- allow to supersede ax_block_input/ax_block_output by card-specific
  optimized code,
- use an optional interrupt status callback to allow easier sharing of the
  card interrupt,
- set IRQF_SHARED if platform IRQ resource is marked shareable

The Asix Electronix PHY used on the X-Surf 100 is buggy, and causes the
software reset to hang if the previous command sent to the PHY was also
a soft reset. This bug requires addition of a PHY driver for Asix PHYs
to provide a fixed .soft_reset function, included in this series.

Some additional cleanup:
- do not attempt to free IRQ in ax_remove (complements 82533ad9),
- clear platform drvdata on probe fail and module remove.

Changes since v1:

Raised in review by Andrew Lunn:
- move MII code around to avoid need for forward declaration,
- combine patches 2 and 7 to add cleanup in error path

Changes since v2:

- corrected authorship attribution to Michael Karcher

Suggested by Geert Uytterhoeven:
- use ei_local->reset_8390() instead of duplicating ax_reset_8390(),
- use %pR to format struct resource pointers,
- assign pdev and xs100 pointers in declaration,
- don't split error messages,
- change Kconfig logic to only require XSURF100 set on Amiga

Suggested by Andrew Lunn:
- add COMPILE_TEST to ax88796 Kconfig options,
- use new Asix PHY driver for X-Surf 100

Suggested by Andrew Lunn/Finn Thain:
- declare struct sk_buff in ax88796.h,
- correct whitespace error in ax88796.h

Changes since v3:

- various checkpatch cleanup

Andrew Lunn:
- don't duplicate genphy_soft_reset in Asix PHY driver, just call
  genphy_soft_reset after writing zero to control register
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/8390/Kconfig

@@ -29,8 +29,8 @@ config PCMCIA_AXNET
 	  called axnet_cs.  If unsure, say N.
 
 config AX88796
-	tristate "ASIX AX88796 NE2000 clone support"
-	depends on (ARM || MIPS || SUPERH)
+	tristate "ASIX AX88796 NE2000 clone support" if !ZORRO
+	depends on (ARM || MIPS || SUPERH || ZORRO || COMPILE_TEST)
 	select CRC32
 	select PHYLIB
 	select MDIO_BITBANG
@@ -45,6 +45,19 @@ config AX88796_93CX6
 	---help---
 	  Select this if your platform comes with an external 93CX6 eeprom.
 
+config XSURF100
+	tristate "Amiga XSurf 100 AX88796/NE2000 clone support"
+	depends on ZORRO
+	select AX88796
+	select ASIX_PHY
+	help
+	  This driver is for the Individual Computers X-Surf 100 Ethernet
+	  card (based on the Asix AX88796 chip). If you have such a card,
+	  say Y. Otherwise, say N.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called xsurf100.
+
 config HYDRA
 	tristate "Hydra support"
 	depends on ZORRO

drivers/net/ethernet/8390/Makefile

@@ -16,4 +16,5 @@ obj-$(CONFIG_PCMCIA_PCNET) += pcnet_cs.o 8390.o
 obj-$(CONFIG_STNIC) += stnic.o 8390.o
 obj-$(CONFIG_ULTRA) += smc-ultra.o 8390.o
 obj-$(CONFIG_WD80x3) += wd.o 8390.o
+obj-$(CONFIG_XSURF100) += xsurf100.o
 obj-$(CONFIG_ZORRO8390) += zorro8390.o

drivers/net/ethernet/8390/ax88796.c

@@ -163,6 +163,21 @@ static void ax_reset_8390(struct net_device *dev)
 	ei_outb(ENISR_RESET, addr + EN0_ISR);	/* Ack intr. */
 }
 
+/* Wrapper for __ei_interrupt for platforms that have a platform-specific
+ * way to find out whether the interrupt request might be caused by
+ * the ax88796 chip.
+ */
+static irqreturn_t ax_ei_interrupt_filtered(int irq, void *dev_id)
+{
+	struct net_device *dev = dev_id;
+	struct ax_device *ax = to_ax_dev(dev);
+	struct platform_device *pdev = to_platform_device(dev->dev.parent);
+
+	if (!ax->plat->check_irq(pdev))
+		return IRQ_NONE;
+
+	return ax_ei_interrupt(irq, dev_id);
+}
 
 static void ax_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
 			    int ring_page)
@@ -387,6 +402,90 @@ static void ax_phy_switch(struct net_device *dev, int on)
 	ei_outb(reg_gpoc, ei_local->mem + EI_SHIFT(0x17));
 }
 
+static void ax_bb_mdc(struct mdiobb_ctrl *ctrl, int level)
+{
+	struct ax_device *ax = container_of(ctrl, struct ax_device, bb_ctrl);
+
+	if (level)
+		ax->reg_memr |= AX_MEMR_MDC;
+	else
+		ax->reg_memr &= ~AX_MEMR_MDC;
+
+	ei_outb(ax->reg_memr, ax->addr_memr);
+}
+
+static void ax_bb_dir(struct mdiobb_ctrl *ctrl, int output)
+{
+	struct ax_device *ax = container_of(ctrl, struct ax_device, bb_ctrl);
+
+	if (output)
+		ax->reg_memr &= ~AX_MEMR_MDIR;
+	else
+		ax->reg_memr |= AX_MEMR_MDIR;
+
+	ei_outb(ax->reg_memr, ax->addr_memr);
+}
+
+static void ax_bb_set_data(struct mdiobb_ctrl *ctrl, int value)
+{
+	struct ax_device *ax = container_of(ctrl, struct ax_device, bb_ctrl);
+
+	if (value)
+		ax->reg_memr |= AX_MEMR_MDO;
+	else
+		ax->reg_memr &= ~AX_MEMR_MDO;
+
+	ei_outb(ax->reg_memr, ax->addr_memr);
+}
+
+static int ax_bb_get_data(struct mdiobb_ctrl *ctrl)
+{
+	struct ax_device *ax = container_of(ctrl, struct ax_device, bb_ctrl);
+	int reg_memr = ei_inb(ax->addr_memr);
+
+	return reg_memr & AX_MEMR_MDI ? 1 : 0;
+}
+
+static const struct mdiobb_ops bb_ops = {
+	.owner = THIS_MODULE,
+	.set_mdc = ax_bb_mdc,
+	.set_mdio_dir = ax_bb_dir,
+	.set_mdio_data = ax_bb_set_data,
+	.get_mdio_data = ax_bb_get_data,
+};
+
+static int ax_mii_init(struct net_device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev->dev.parent);
+	struct ei_device *ei_local = netdev_priv(dev);
+	struct ax_device *ax = to_ax_dev(dev);
+	int err;
+
+	ax->bb_ctrl.ops = &bb_ops;
+	ax->addr_memr = ei_local->mem + AX_MEMR;
+	ax->mii_bus = alloc_mdio_bitbang(&ax->bb_ctrl);
+	if (!ax->mii_bus) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	ax->mii_bus->name = "ax88796_mii_bus";
+	ax->mii_bus->parent = dev->dev.parent;
+	snprintf(ax->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
+		 pdev->name, pdev->id);
+
+	err = mdiobus_register(ax->mii_bus);
+	if (err)
+		goto out_free_mdio_bitbang;
+
+	return 0;
+
+ out_free_mdio_bitbang:
+	free_mdio_bitbang(ax->mii_bus);
+ out:
+	return err;
+}
+
 static int ax_open(struct net_device *dev)
 {
 	struct ax_device *ax = to_ax_dev(dev);
@@ -394,8 +493,16 @@ static int ax_open(struct net_device *dev)
 
 	netdev_dbg(dev, "open\n");
 
-	ret = request_irq(dev->irq, ax_ei_interrupt, ax->irqflags,
-			  dev->name, dev);
+	ret = ax_mii_init(dev);
+	if (ret)
+		goto failed_mii;
+
+	if (ax->plat->check_irq)
+		ret = request_irq(dev->irq, ax_ei_interrupt_filtered,
+				  ax->irqflags, dev->name, dev);
+	else
+		ret = request_irq(dev->irq, ax_ei_interrupt, ax->irqflags,
+				  dev->name, dev);
 	if (ret)
 		goto failed_request_irq;
 
@@ -421,6 +528,10 @@ static int ax_open(struct net_device *dev)
 	ax_phy_switch(dev, 0);
 	free_irq(dev->irq, dev);
  failed_request_irq:
+	/* unregister mdiobus */
+	mdiobus_unregister(ax->mii_bus);
+	free_mdio_bitbang(ax->mii_bus);
+ failed_mii:
 	return ret;
 }
 
@@ -440,6 +551,9 @@ static int ax_close(struct net_device *dev)
 	phy_disconnect(dev->phydev);
 
 	free_irq(dev->irq, dev);
+
+	mdiobus_unregister(ax->mii_bus);
+	free_mdio_bitbang(ax->mii_bus);
 	return 0;
 }
 
@@ -539,92 +653,8 @@ static const struct net_device_ops ax_netdev_ops = {
 #endif
 };
 
-static void ax_bb_mdc(struct mdiobb_ctrl *ctrl, int level)
-{
-	struct ax_device *ax = container_of(ctrl, struct ax_device, bb_ctrl);
-
-	if (level)
-		ax->reg_memr |= AX_MEMR_MDC;
-	else
-		ax->reg_memr &= ~AX_MEMR_MDC;
-
-	ei_outb(ax->reg_memr, ax->addr_memr);
-}
-
-static void ax_bb_dir(struct mdiobb_ctrl *ctrl, int output)
-{
-	struct ax_device *ax = container_of(ctrl, struct ax_device, bb_ctrl);
-
-	if (output)
-		ax->reg_memr &= ~AX_MEMR_MDIR;
-	else
-		ax->reg_memr |= AX_MEMR_MDIR;
-
-	ei_outb(ax->reg_memr, ax->addr_memr);
-}
-
-static void ax_bb_set_data(struct mdiobb_ctrl *ctrl, int value)
-{
-	struct ax_device *ax = container_of(ctrl, struct ax_device, bb_ctrl);
-
-	if (value)
-		ax->reg_memr |= AX_MEMR_MDO;
-	else
-		ax->reg_memr &= ~AX_MEMR_MDO;
-
-	ei_outb(ax->reg_memr, ax->addr_memr);
-}
-
-static int ax_bb_get_data(struct mdiobb_ctrl *ctrl)
-{
-	struct ax_device *ax = container_of(ctrl, struct ax_device, bb_ctrl);
-	int reg_memr = ei_inb(ax->addr_memr);
-
-	return reg_memr & AX_MEMR_MDI ? 1 : 0;
-}
-
-static const struct mdiobb_ops bb_ops = {
-	.owner = THIS_MODULE,
-	.set_mdc = ax_bb_mdc,
-	.set_mdio_dir = ax_bb_dir,
-	.set_mdio_data = ax_bb_set_data,
-	.get_mdio_data = ax_bb_get_data,
-};
-
 /* setup code */
 
-static int ax_mii_init(struct net_device *dev)
-{
-	struct platform_device *pdev = to_platform_device(dev->dev.parent);
-	struct ei_device *ei_local = netdev_priv(dev);
-	struct ax_device *ax = to_ax_dev(dev);
-	int err;
-
-	ax->bb_ctrl.ops = &bb_ops;
-	ax->addr_memr = ei_local->mem + AX_MEMR;
-	ax->mii_bus = alloc_mdio_bitbang(&ax->bb_ctrl);
-	if (!ax->mii_bus) {
-		err = -ENOMEM;
-		goto out;
-	}
-
-	ax->mii_bus->name = "ax88796_mii_bus";
-	ax->mii_bus->parent = dev->dev.parent;
-	snprintf(ax->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
-		pdev->name, pdev->id);
-
-	err = mdiobus_register(ax->mii_bus);
-	if (err)
-		goto out_free_mdio_bitbang;
-
-	return 0;
-
- out_free_mdio_bitbang:
-	free_mdio_bitbang(ax->mii_bus);
- out:
-	return err;
-}
-
 static void ax_initial_setup(struct net_device *dev, struct ei_device *ei_local)
 {
 	void __iomem *ioaddr = ei_local->mem;
@@ -669,10 +699,16 @@ static int ax_init_dev(struct net_device *dev)
 	if (ax->plat->flags & AXFLG_HAS_EEPROM) {
 		unsigned char SA_prom[32];
 
+		ei_outb(6, ioaddr + EN0_RCNTLO);
+		ei_outb(0, ioaddr + EN0_RCNTHI);
+		ei_outb(0, ioaddr + EN0_RSARLO);
+		ei_outb(0, ioaddr + EN0_RSARHI);
+		ei_outb(E8390_RREAD + E8390_START, ioaddr + NE_CMD);
 		for (i = 0; i < sizeof(SA_prom); i += 2) {
 			SA_prom[i] = ei_inb(ioaddr + NE_DATAPORT);
 			SA_prom[i + 1] = ei_inb(ioaddr + NE_DATAPORT);
 		}
+		ei_outb(ENISR_RDC, ioaddr + EN0_ISR);	/* Ack intr. */
 
 		if (ax->plat->wordlength == 2)
 			for (i = 0; i < 16; i++)
@@ -741,18 +777,20 @@ static int ax_init_dev(struct net_device *dev)
 #endif
 
 	ei_local->reset_8390 = &ax_reset_8390;
-	ei_local->block_input = &ax_block_input;
-	ei_local->block_output = &ax_block_output;
+	if (ax->plat->block_input)
+		ei_local->block_input = ax->plat->block_input;
+	else
+		ei_local->block_input = &ax_block_input;
+	if (ax->plat->block_output)
+		ei_local->block_output = ax->plat->block_output;
+	else
+		ei_local->block_output = &ax_block_output;
 	ei_local->get_8390_hdr = &ax_get_8390_hdr;
 	ei_local->priv = 0;
 
 	dev->netdev_ops = &ax_netdev_ops;
 	dev->ethtool_ops = &ax_ethtool_ops;
 
-	ret = ax_mii_init(dev);
-	if (ret)
-		goto err_out;
-
 	ax_NS8390_init(dev, 0);
 
 	ret = register_netdev(dev);
@@ -777,7 +815,6 @@ static int ax_remove(struct platform_device *pdev)
 	struct resource *mem;
 
 	unregister_netdev(dev);
-	free_irq(dev->irq, dev);
 
 	iounmap(ei_local->mem);
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -789,6 +826,7 @@ static int ax_remove(struct platform_device *pdev)
 		release_mem_region(mem->start, resource_size(mem));
 	}
 
+	platform_set_drvdata(pdev, NULL);
 	free_netdev(dev);
 
 	return 0;
@@ -835,6 +873,9 @@ static int ax_probe(struct platform_device *pdev)
 	dev->irq = irq->start;
 	ax->irqflags = irq->flags & IRQF_TRIGGER_MASK;
 
+	if (irq->flags &  IORESOURCE_IRQ_SHAREABLE)
+		ax->irqflags |= IRQF_SHARED;
+
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!mem) {
 		dev_err(&pdev->dev, "no MEM specified\n");
@@ -919,6 +960,7 @@ static int ax_probe(struct platform_device *pdev)
 	release_mem_region(mem->start, mem_size);
 
  exit_mem:
+	platform_set_drvdata(pdev, NULL);
 	free_netdev(dev);
 
 	return ret;

drivers/net/ethernet/8390/xsurf100.c

+// SPDX-License-Identifier: GPL-2.0
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/platform_device.h>
+#include <linux/zorro.h>
+#include <net/ax88796.h>
+#include <asm/amigaints.h>
+
+#define ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF100 \
+		ZORRO_ID(INDIVIDUAL_COMPUTERS, 0x64, 0)
+
+#define XS100_IRQSTATUS_BASE 0x40
+#define XS100_8390_BASE 0x800
+
+/* Longword-access area. Translated to 2 16-bit access cycles by the
+ * X-Surf 100 FPGA
+ */
+#define XS100_8390_DATA32_BASE 0x8000
+#define XS100_8390_DATA32_SIZE 0x2000
+/* Sub-Areas for fast data register access; addresses relative to area begin */
+#define XS100_8390_DATA_READ32_BASE 0x0880
+#define XS100_8390_DATA_WRITE32_BASE 0x0C80
+#define XS100_8390_DATA_AREA_SIZE 0x80
+
+#define __NS8390_init ax_NS8390_init
+
+/* force unsigned long back to 'void __iomem *' */
+#define ax_convert_addr(_a) ((void __force __iomem *)(_a))
+
+#define ei_inb(_a) z_readb(ax_convert_addr(_a))
+#define ei_outb(_v, _a) z_writeb(_v, ax_convert_addr(_a))
+
+#define ei_inw(_a) z_readw(ax_convert_addr(_a))
+#define ei_outw(_v, _a) z_writew(_v, ax_convert_addr(_a))
+
+#define ei_inb_p(_a) ei_inb(_a)
+#define ei_outb_p(_v, _a) ei_outb(_v, _a)
+
+/* define EI_SHIFT() to take into account our register offsets */
+#define EI_SHIFT(x) (ei_local->reg_offset[(x)])
+
+/* Ensure we have our RCR base value */
+#define AX88796_PLATFORM
+
+static unsigned char version[] =
+		"ax88796.c: Copyright 2005,2007 Simtec Electronics\n";
+
+#include "lib8390.c"
+
+/* from ne.c */
+#define NE_CMD		EI_SHIFT(0x00)
+#define NE_RESET	EI_SHIFT(0x1f)
+#define NE_DATAPORT	EI_SHIFT(0x10)
+
+struct xsurf100_ax_plat_data {
+	struct ax_plat_data ax;
+	void __iomem *base_regs;
+	void __iomem *data_area;
+};
+
+static int is_xsurf100_network_irq(struct platform_device *pdev)
+{
+	struct xsurf100_ax_plat_data *xs100 = dev_get_platdata(&pdev->dev);
+
+	return (readw(xs100->base_regs + XS100_IRQSTATUS_BASE) & 0xaaaa) != 0;
+}
+
+/* These functions guarantee that the iomem is accessed with 32 bit
+ * cycles only. z_memcpy_fromio / z_memcpy_toio don't
+ */
+static void z_memcpy_fromio32(void *dst, const void __iomem *src, size_t bytes)
+{
+	while (bytes > 32) {
+		asm __volatile__
+		   ("movem.l (%0)+,%%d0-%%d7\n"
+		    "movem.l %%d0-%%d7,(%1)\n"
+		    "adda.l #32,%1" : "=a"(src), "=a"(dst)
+		    : "0"(src), "1"(dst) : "d0", "d1", "d2", "d3", "d4",
+					   "d5", "d6", "d7", "memory");
+		bytes -= 32;
+	}
+	while (bytes) {
+		*(uint32_t *)dst = z_readl(src);
+		src += 4;
+		dst += 4;
+		bytes -= 4;
+	}
+}
+
+static void z_memcpy_toio32(void __iomem *dst, const void *src, size_t bytes)
+{
+	while (bytes) {
+		z_writel(*(const uint32_t *)src, dst);
+		src += 4;
+		dst += 4;
+		bytes -= 4;
+	}
+}
+
+static void xs100_write(struct net_device *dev, const void *src,
+			unsigned int count)
+{
+	struct ei_device *ei_local = netdev_priv(dev);
+	struct platform_device *pdev = to_platform_device(dev->dev.parent);
+	struct xsurf100_ax_plat_data *xs100 = dev_get_platdata(&pdev->dev);
+
+	/* copy whole blocks */
+	while (count > XS100_8390_DATA_AREA_SIZE) {
+		z_memcpy_toio32(xs100->data_area +
+				XS100_8390_DATA_WRITE32_BASE, src,
+				XS100_8390_DATA_AREA_SIZE);
+		src += XS100_8390_DATA_AREA_SIZE;
+		count -= XS100_8390_DATA_AREA_SIZE;
+	}
+	/* copy whole dwords */
+	z_memcpy_toio32(xs100->data_area + XS100_8390_DATA_WRITE32_BASE,
+			src, count & ~3);
+	src += count & ~3;
+	if (count & 2) {
+		ei_outw(*(uint16_t *)src, ei_local->mem + NE_DATAPORT);
+		src += 2;
+	}
+	if (count & 1)
+		ei_outb(*(uint8_t *)src, ei_local->mem + NE_DATAPORT);
+}
+
+static void xs100_read(struct net_device *dev, void *dst, unsigned int count)
+{
+	struct ei_device *ei_local = netdev_priv(dev);
+	struct platform_device *pdev = to_platform_device(dev->dev.parent);
+	struct xsurf100_ax_plat_data *xs100 = dev_get_platdata(&pdev->dev);
+
+	/* copy whole blocks */
+	while (count > XS100_8390_DATA_AREA_SIZE) {
+		z_memcpy_fromio32(dst, xs100->data_area +
+				  XS100_8390_DATA_READ32_BASE,
+				  XS100_8390_DATA_AREA_SIZE);
+		dst += XS100_8390_DATA_AREA_SIZE;
+		count -= XS100_8390_DATA_AREA_SIZE;
+	}
+	/* copy whole dwords */
+	z_memcpy_fromio32(dst, xs100->data_area + XS100_8390_DATA_READ32_BASE,
+			  count & ~3);
+	dst += count & ~3;
+	if (count & 2) {
+		*(uint16_t *)dst = ei_inw(ei_local->mem + NE_DATAPORT);
+		dst += 2;
+	}
+	if (count & 1)
+		*(uint8_t *)dst = ei_inb(ei_local->mem + NE_DATAPORT);
+}
+
+/* Block input and output, similar to the Crynwr packet driver. If
+ * you are porting to a new ethercard, look at the packet driver
+ * source for hints. The NEx000 doesn't share the on-board packet
+ * memory -- you have to put the packet out through the "remote DMA"
+ * dataport using ei_outb.
+ */
+static void xs100_block_input(struct net_device *dev, int count,
+			      struct sk_buff *skb, int ring_offset)
+{
+	struct ei_device *ei_local = netdev_priv(dev);
+	void __iomem *nic_base = ei_local->mem;
+	char *buf = skb->data;
+
+	if (ei_local->dmaing) {
+		netdev_err(dev,
+			   "DMAing conflict in %s [DMAstat:%d][irqlock:%d]\n",
+			   __func__,
+			   ei_local->dmaing, ei_local->irqlock);
+		return;
+	}
+
+	ei_local->dmaing |= 0x01;
+
+	ei_outb(E8390_NODMA + E8390_PAGE0 + E8390_START, nic_base + NE_CMD);
+	ei_outb(count & 0xff, nic_base + EN0_RCNTLO);
+	ei_outb(count >> 8, nic_base + EN0_RCNTHI);
+	ei_outb(ring_offset & 0xff, nic_base + EN0_RSARLO);
+	ei_outb(ring_offset >> 8, nic_base + EN0_RSARHI);
+	ei_outb(E8390_RREAD + E8390_START, nic_base + NE_CMD);
+
+	xs100_read(dev, buf, count);
+
+	ei_local->dmaing &= ~1;
+}
+
+static void xs100_block_output(struct net_device *dev, int count,
+			       const unsigned char *buf, const int start_page)
+{
+	struct ei_device *ei_local = netdev_priv(dev);
+	void __iomem *nic_base = ei_local->mem;
+	unsigned long dma_start;
+
+	/* Round the count up for word writes. Do we need to do this?
+	 * What effect will an odd byte count have on the 8390?  I
+	 * should check someday.
+	 */
+	if (ei_local->word16 && (count & 0x01))
+		count++;
+
+	/* This *shouldn't* happen. If it does, it's the last thing
+	 * you'll see
+	 */
+	if (ei_local->dmaing) {
+		netdev_err(dev,
+			   "DMAing conflict in %s [DMAstat:%d][irqlock:%d]\n",
+			   __func__,
+			   ei_local->dmaing, ei_local->irqlock);
+		return;
+	}
+
+	ei_local->dmaing |= 0x01;
+	/* We should already be in page 0, but to be safe... */
+	ei_outb(E8390_PAGE0 + E8390_START + E8390_NODMA, nic_base + NE_CMD);
+
+	ei_outb(ENISR_RDC, nic_base + EN0_ISR);
+
+	/* Now the normal output. */
+	ei_outb(count & 0xff, nic_base + EN0_RCNTLO);
+	ei_outb(count >> 8, nic_base + EN0_RCNTHI);
+	ei_outb(0x00, nic_base + EN0_RSARLO);
+	ei_outb(start_page, nic_base + EN0_RSARHI);
+
+	ei_outb(E8390_RWRITE + E8390_START, nic_base + NE_CMD);
+
+	xs100_write(dev, buf, count);
+
+	dma_start = jiffies;
+
+	while ((ei_inb(nic_base + EN0_ISR) & ENISR_RDC) == 0) {
+		if (jiffies - dma_start > 2 * HZ / 100) {	/* 20ms */
+			netdev_warn(dev, "timeout waiting for Tx RDC.\n");
+			ei_local->reset_8390(dev);
+			ax_NS8390_init(dev, 1);
+			break;
+		}
+	}
+
+	ei_outb(ENISR_RDC, nic_base + EN0_ISR);	/* Ack intr. */
+	ei_local->dmaing &= ~0x01;
+}
+
+static int xsurf100_probe(struct zorro_dev *zdev,
+			  const struct zorro_device_id *ent)
+{
+	struct platform_device *pdev;
+	struct xsurf100_ax_plat_data ax88796_data;
+	struct resource res[2] = {
+		DEFINE_RES_NAMED(IRQ_AMIGA_PORTS, 1, NULL,
+				 IORESOURCE_IRQ | IORESOURCE_IRQ_SHAREABLE),
+		DEFINE_RES_MEM(zdev->resource.start + XS100_8390_BASE,
+			       4 * 0x20)
+	};
+	int reg;
+	/* This table is referenced in the device structure, so it must
+	 * outlive the scope of xsurf100_probe.
+	 */
+	static u32 reg_offsets[32];
+	int ret = 0;
+
+	/* X-Surf 100 control and 32 bit ring buffer data access areas.
+	 * These resources are not used by the ax88796 driver, so must
+	 * be requested here and passed via platform data.
+	 */
+
+	if (!request_mem_region(zdev->resource.start, 0x100, zdev->name)) {
+		dev_err(&zdev->dev, "cannot reserve X-Surf 100 control registers\n");
+		return -ENXIO;
+	}
+
+	if (!request_mem_region(zdev->resource.start +
+				XS100_8390_DATA32_BASE,
+				XS100_8390_DATA32_SIZE,
+				"X-Surf 100 32-bit data access")) {
+		dev_err(&zdev->dev, "cannot reserve 32-bit area\n");
+		ret = -ENXIO;
+		goto exit_req;
+	}
+
+	for (reg = 0; reg < 0x20; reg++)
+		reg_offsets[reg] = 4 * reg;
+
+	memset(&ax88796_data, 0, sizeof(ax88796_data));
+	ax88796_data.ax.flags = AXFLG_HAS_EEPROM;
+	ax88796_data.ax.wordlength = 2;
+	ax88796_data.ax.dcr_val = 0x48;
+	ax88796_data.ax.rcr_val = 0x40;
+	ax88796_data.ax.reg_offsets = reg_offsets;
+	ax88796_data.ax.check_irq = is_xsurf100_network_irq;
+	ax88796_data.base_regs = ioremap(zdev->resource.start, 0x100);
+
+	/* error handling for ioremap regs */
+	if (!ax88796_data.base_regs) {
+		dev_err(&zdev->dev, "Cannot ioremap area %pR (registers)\n",
+			&zdev->resource);
+
+		ret = -ENXIO;
+		goto exit_req2;
+	}
+
+	ax88796_data.data_area = ioremap(zdev->resource.start +
+			XS100_8390_DATA32_BASE, XS100_8390_DATA32_SIZE);
+
+	/* error handling for ioremap data */
+	if (!ax88796_data.data_area) {
+		dev_err(&zdev->dev,
+			"Cannot ioremap area %pR offset %x (32-bit access)\n",
+			&zdev->resource,  XS100_8390_DATA32_BASE);
+
+		ret = -ENXIO;
+		goto exit_mem;
+	}
+
+	ax88796_data.ax.block_output = xs100_block_output;
+	ax88796_data.ax.block_input = xs100_block_input;
+
+	pdev = platform_device_register_resndata(&zdev->dev, "ax88796",
+						 zdev->slotaddr, res, 2,
+						 &ax88796_data,
+						 sizeof(ax88796_data));
+
+	if (IS_ERR(pdev)) {
+		dev_err(&zdev->dev, "cannot register platform device\n");
+		ret = -ENXIO;
+		goto exit_mem2;
+	}
+
+	zorro_set_drvdata(zdev, pdev);
+
+	if (!ret)
+		return 0;
+
+ exit_mem2:
+	iounmap(ax88796_data.data_area);
+
+ exit_mem:
+	iounmap(ax88796_data.base_regs);
+
+ exit_req2:
+	release_mem_region(zdev->resource.start + XS100_8390_DATA32_BASE,
+			   XS100_8390_DATA32_SIZE);
+
+ exit_req:
+	release_mem_region(zdev->resource.start, 0x100);
+
+	return ret;
+}
+
+static void xsurf100_remove(struct zorro_dev *zdev)
+{
+	struct platform_device *pdev = zorro_get_drvdata(zdev);
+	struct xsurf100_ax_plat_data *xs100 = dev_get_platdata(&pdev->dev);
+
+	platform_device_unregister(pdev);
+
+	iounmap(xs100->base_regs);
+	release_mem_region(zdev->resource.start, 0x100);
+	iounmap(xs100->data_area);
+	release_mem_region(zdev->resource.start + XS100_8390_DATA32_BASE,
+			   XS100_8390_DATA32_SIZE);
+}
+
+static const struct zorro_device_id xsurf100_zorro_tbl[] = {
+	{ ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF100, },
+	{ 0 }
+};
+
+MODULE_DEVICE_TABLE(zorro, xsurf100_zorro_tbl);
+
+static struct zorro_driver xsurf100_driver = {
+	.name           = "xsurf100",
+	.id_table       = xsurf100_zorro_tbl,
+	.probe          = xsurf100_probe,
+	.remove         = xsurf100_remove,
+};
+
+module_driver(xsurf100_driver, zorro_register_driver, zorro_unregister_driver);
+
+MODULE_DESCRIPTION("X-Surf 100 driver");
+MODULE_AUTHOR("Michael Karcher <kernel@mkarcher.dialup.fu-berlin.de>");
+MODULE_LICENSE("GPL v2");

drivers/net/phy/Kconfig

@@ -218,6 +218,12 @@ config AQUANTIA_PHY
 	---help---
 	  Currently supports the Aquantia AQ1202, AQ2104, AQR105, AQR405
 
+config ASIX_PHY
+	tristate "Asix PHYs"
+	help
+	  Currently supports the Asix Electronics PHY found in the X-Surf 100
+	  AX88796B package.
+
 config AT803X_PHY
 	tristate "AT803X PHYs"
 	---help---

drivers/net/phy/Makefile

@@ -45,6 +45,7 @@ obj-y				+= $(sfp-obj-y) $(sfp-obj-m)
 
 obj-$(CONFIG_AMD_PHY)		+= amd.o
 obj-$(CONFIG_AQUANTIA_PHY)	+= aquantia.o
+obj-$(CONFIG_ASIX_PHY)		+= asix.o
 obj-$(CONFIG_AT803X_PHY)	+= at803x.o
 obj-$(CONFIG_BCM63XX_PHY)	+= bcm63xx.o
 obj-$(CONFIG_BCM7XXX_PHY)	+= bcm7xxx.o

drivers/net/phy/asix.c

+// SPDX-License-Identifier: GPL-2.0
+/* Driver for Asix PHYs
+ *
+ * Author: Michael Schmitz <schmitzmic@gmail.com>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mii.h>
+#include <linux/phy.h>
+
+#define PHY_ID_ASIX_AX88796B		0x003b1841
+
+MODULE_DESCRIPTION("Asix PHY driver");
+MODULE_AUTHOR("Michael Schmitz <schmitzmic@gmail.com>");
+MODULE_LICENSE("GPL");
+
+/**
+ * asix_soft_reset - software reset the PHY via BMCR_RESET bit
+ * @phydev: target phy_device struct
+ *
+ * Description: Perform a software PHY reset using the standard
+ * BMCR_RESET bit and poll for the reset bit to be cleared.
+ * Toggle BMCR_RESET bit off to accommodate broken AX8796B PHY implementation
+ * such as used on the Individual Computers' X-Surf 100 Zorro card.
+ *
+ * Returns: 0 on success, < 0 on failure
+ */
+static int asix_soft_reset(struct phy_device *phydev)
+{
+	int ret;
+
+	/* Asix PHY won't reset unless reset bit toggles */
+	ret = phy_write(phydev, MII_BMCR, 0);
+	if (ret < 0)
+		return ret;
+
+	return genphy_soft_reset(phydev);
+}
+
+static struct phy_driver asix_driver[] = { {
+	.phy_id		= PHY_ID_ASIX_AX88796B,
+	.name		= "Asix Electronics AX88796B",
+	.phy_id_mask	= 0xfffffff0,
+	.features	= PHY_BASIC_FEATURES,
+	.soft_reset	= asix_soft_reset,
+} };
+
+module_phy_driver(asix_driver);
+
+static struct mdio_device_id __maybe_unused asix_tbl[] = {
+	{ PHY_ID_ASIX_AX88796B, 0xfffffff0 },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(mdio, asix_tbl);

include/net/ax88796.h

@@ -12,6 +12,10 @@
 #ifndef __NET_AX88796_PLAT_H
 #define __NET_AX88796_PLAT_H
 
+struct sk_buff;
+struct net_device;
+struct platform_device;
+
 #define AXFLG_HAS_EEPROM		(1<<0)
 #define AXFLG_MAC_FROMDEV		(1<<1)	/* device already has MAC */
 #define AXFLG_HAS_93CX6			(1<<2)	/* use eeprom_93cx6 driver */
@@ -26,6 +30,16 @@ struct ax_plat_data {
 	u32		*reg_offsets;	/* register offsets */
 	u8		*mac_addr;	/* MAC addr (only used when
 					   AXFLG_MAC_FROMPLATFORM is used */
+
+	/* uses default ax88796 buffer if set to NULL */
+	void (*block_output)(struct net_device *dev, int count,
+			const unsigned char *buf, int star_page);
+	void (*block_input)(struct net_device *dev, int count,
+			struct sk_buff *skb, int ring_offset);
+	/* returns nonzero if a pending interrupt request might by caused by
+	 * the ax88786. Handles all interrupts if set to NULL
+	 */
+	int (*check_irq)(struct platform_device *pdev);
 };
 
 #endif /* __NET_AX88796_PLAT_H */