[PATCH v11 0/3] Add APNE PCMCIA 100 Mbit support

The first patch enables the use of core PCMCIA code to parse
config table entries in Amiga drivers. The remaining two patches
add 16 bit IO support to the m68k low-level IO access code, and 
add code to the APNE driver to autoprobe for 16 bit IO on cards
that support it (the 100 Mbit cards). The core PCMCIA config
table parser is utilized for this (may be built as a module;
must be selected manually for build in order to enable autoprobe).

Tested by Alex on a 100 Mbit card. Not yet tested on 10 Mbit
cards - if any of those also have the 16 bit IO feature set
in their config table, this patch series would break on those
cards. 

Note that only patch 3 has been sent to netdev. Please CC
linux-m68k when providing comments.

v11 addresses review comments by Geert.

Cheers,

   Michael

CC: netdev@vger.kernel.org

Add module parameter, IO mode autoprobe and PCMCIA reset code
required to support 100 Mbit PCMCIA ethernet cards on Amiga.

10 Mbit and 100 Mbit mode are supported by the same module.
Use the core PCMCIA cftable parser to detect 16 bit cards,
and automatically enable 16 bit ISA IO access for those cards
by changing isa_type at runtime. The user must select PCCARD
and PCMCIA in the kernel config to make the necessary support
modules available

Code to reset the PCMCIA hardware required for 16 bit cards is
also added to the driver probe.

An optional module parameter switches Amiga ISA IO accessors
to 8 or 16 bit access in case autoprobe fails.

Patch modified after patch "[PATCH RFC net-next] Amiga PCMCIA
100 MBit card support" submitted to netdev 2018/09/16 by Alex
Kazik [off-list ref].

CC: netdev@vger.kernel.org
Link: https://lore.kernel.org/r/1622958877-2026-1-git-send-email-schmitzmic@gmail.com
Tested-by: Alex Kazik <redacted>
Signed-off-by: Michael Schmitz <schmitzmic@gmail.com>

--

Changes from v9:

- avoid pcmcia_is_16bit() forward declaration

Randy Dunlap:
- do not select PCCARD and PCMCIA options when selecting APNE

Changes from v8:

Geert Uytterhoeven:
- cistpl.h definitions now provided through amipcmcia.h
- really change module parameter to (signed) int

Changes from v7:

- move 'select' for PCCARD and PCMCIA to 8390 Kconfig, so
  Amiga pcmcia.c may remain built-in while core PCMCIA
  code can be built as modules if APNE driver is a module.
- move 16 bit mode autoprobe code from amiga/pcmcia.c to this
  driver, to allow the core PCMCIA code we depend on to be
  built as modules.
- change module parameter type from bool to int to allow for
  tri-state semantics (autoprobe, 8 bit, 16 bit).

Changes from v6:

- use 16 bit mode autoprobe based on PCMCIA config table data

Changes from v5:

- move autoprobe code to new patch in this series

Geert Uytterhoeven:
- reword Kconfig help text

Finn Thain:
- style fixes, use msec_to_jiffies in timeout calc

Alex Kazik:
- revert module parameter permission change

Changes from v4:

Geert Uytterhoeven:
- remove APNE100MBIT config option, always include 16 bit support
- change module parameter permissions
- try autoprobing for 16 bit mode early on in device probe

Changes from v3:

- change module parameter name to match Kconfig help

Finn Thain:
- fix coding style in new card reset code block
- allow reset of isa_type by module parameter

Changes from v1:

- fix module parameter name in Kconfig help text

Alex Kazik:
- change module parameter type to bool, fix module parameter
  permission

Changes from RFC:

Geert Uytterhoeven:
- change APNE_100MBIT to depend on APNE
- change '---help---' to 'help' (former no longer supported)
- fix whitespace errors
- fix module_param_named() arg count
- protect all added code by #ifdef CONFIG_APNE_100MBIT
---
 drivers/net/ethernet/8390/Kconfig |  8 ++++
 drivers/net/ethernet/8390/apne.c  | 67 +++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+)

diff --git a/drivers/net/ethernet/8390/Kconfig b/drivers/net/ethernet/8390/Kconfig
index a4130e643342..c4f519a385f3 100644
--- a/drivers/net/ethernet/8390/Kconfig
+++ b/drivers/net/ethernet/8390/Kconfig

@@ -144,6 +144,14 @@ config APNE
 	  To compile this driver as a module, choose M here: the module
 	  will be called apne.
 
+	  The driver also supports 10/100Mbit cards (e.g. Netgear FA411,
+	  CNet Singlepoint). To activate 100 Mbit support, use the kernel
+	  option apne.100mbit=1 (builtin) at boot time, or the apne.100mbit
+	  module parameter. The driver can attempt to autoprobe 100 Mbit
+	  mode if the PCCARD and PCMCIA kernel configuration options are
+	  selected, so this option may not be necessary. Use apne.100mbit=0
+	  should autoprobe mis-detect a 100 Mbit card.
+
 config PCMCIA_PCNET
 	tristate "NE2000 compatible PCMCIA support"
 	depends on PCMCIA

diff --git a/drivers/net/ethernet/8390/apne.c b/drivers/net/ethernet/8390/apne.c
index da1ae37a9d73..6642e2f304b3 100644
--- a/drivers/net/ethernet/8390/apne.c
+++ b/drivers/net/ethernet/8390/apne.c

@@ -119,6 +119,48 @@ static u32 apne_msg_enable;
 module_param_named(msg_enable, apne_msg_enable, uint, 0444);
 MODULE_PARM_DESC(msg_enable, "Debug message level (see linux/netdevice.h for bitmap)");
 
+static int apne_100_mbit = -1;
+module_param_named(100_mbit, apne_100_mbit, int, 0444);
+MODULE_PARM_DESC(100_mbit, "Enable 100 Mbit support");
+
+#if IS_ENABLED(CONFIG_PCMCIA)
+static int pcmcia_is_16bit(void)
+{
+	u_char cftuple[258];
+	int cftuple_len;
+	tuple_t cftable_tuple;
+	cistpl_cftable_entry_t cftable_entry;
+
+	cftuple_len = pcmcia_copy_tuple(CISTPL_CFTABLE_ENTRY, cftuple, 256);
+	if (cftuple_len < 3)
+		return 0;
+#ifdef DEBUG
+	else
+		print_hex_dump(KERN_WARNING, "cftable: ", DUMP_PREFIX_NONE, 8,
+			       sizeof(char), cftuple, cftuple_len, false);
+#endif
+
+	/* build tuple_t struct and call pcmcia_parse_tuple */
+	cftable_tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
+	cftable_tuple.TupleCode = CISTPL_CFTABLE_ENTRY;
+	cftable_tuple.TupleData = &cftuple[2];
+	cftable_tuple.TupleDataLen = cftuple_len - 2;
+	cftable_tuple.TupleDataMax = cftuple_len - 2;
+
+	if (pcmcia_parse_tuple(&cftable_tuple, (cisparse_t *)&cftable_entry))
+		return 0;
+
+#ifdef DEBUG
+	pr_info("IO flags: %x\n", cftable_entry.io.flags);
+#endif
+
+	if (cftable_entry.io.flags & CISTPL_IO_16BIT)
+		return 1;
+
+	return 0;
+}
+#endif
+
 static struct net_device * __init apne_probe(void)
 {
 	struct net_device *dev;

@@ -140,6 +182,13 @@ static struct net_device * __init apne_probe(void)
 
 	pr_info("Looking for PCMCIA ethernet card : ");
 
+	if (apne_100_mbit == 1)
+		isa_type = ISA_TYPE_AG16;
+	else if (apne_100_mbit == 0)
+		isa_type = ISA_TYPE_AG;
+	else
+		pr_cont(" (autoprobing 16 bit mode) ");
+
 	/* check if a card is inserted */
 	if (!(PCMCIA_INSERTED)) {
 		pr_cont("NO PCMCIA card inserted\n");

@@ -167,6 +216,14 @@ static struct net_device * __init apne_probe(void)
 
 	pr_cont("ethernet PCMCIA card inserted\n");
 
+#if IS_ENABLED(CONFIG_PCMCIA)
+	if (apne_100_mbit < 0 && pcmcia_is_16bit()) {
+		pr_info("16-bit PCMCIA card detected!\n");
+		isa_type = ISA_TYPE_AG16;
+		apne_100_mbit = 1;
+	}
+#endif
+
 	if (!init_pcmcia()) {
 		/* XXX: shouldn't we re-enable irq here? */
 		free_netdev(dev);

@@ -583,6 +640,16 @@ static int init_pcmcia(void)
 #endif
 	u_long offset;
 
+	/* reset card (idea taken from CardReset by Artur Pogoda) */
+	if (isa_type == ISA_TYPE_AG16) {
+		u_char tmp = gayle.intreq;
+
+		gayle.intreq = 0xff;
+		mdelay(1);
+		gayle.intreq = tmp;
+		mdelay(300);
+	}
+
 	pcmcia_reset();
 	pcmcia_program_voltage(PCMCIA_0V);
 	pcmcia_access_speed(PCMCIA_SPEED_250NS);

-- 
2.17.1

Hi Michael,

On Mon, Nov 15, 2021 at 12:40 AM Michael Schmitz [off-list ref] wrote:

Add module parameter, IO mode autoprobe and PCMCIA reset code
required to support 100 Mbit PCMCIA ethernet cards on Amiga.

10 Mbit and 100 Mbit mode are supported by the same module.
Use the core PCMCIA cftable parser to detect 16 bit cards,
and automatically enable 16 bit ISA IO access for those cards
by changing isa_type at runtime. The user must select PCCARD
and PCMCIA in the kernel config to make the necessary support
modules available

Code to reset the PCMCIA hardware required for 16 bit cards is
also added to the driver probe.

An optional module parameter switches Amiga ISA IO accessors
to 8 or 16 bit access in case autoprobe fails.

Patch modified after patch "[PATCH RFC net-next] Amiga PCMCIA
100 MBit card support" submitted to netdev 2018/09/16 by Alex
Kazik [off-list ref].

CC: netdev@vger.kernel.org
Link: https://lore.kernel.org/r/1622958877-2026-1-git-send-email-schmitzmic@gmail.com
Tested-by: Alex Kazik <redacted>
Signed-off-by: Michael Schmitz <schmitzmic@gmail.com>

Thanks for your patch!

What if CONFIG_PCMIA=m, and CONFIG_APNE=y?

+static int pcmcia_is_16bit(void)
+{
+       u_char cftuple[258];
+       int cftuple_len;
+       tuple_t cftable_tuple;
+       cistpl_cftable_entry_t cftable_entry;
+
+       cftuple_len = pcmcia_copy_tuple(CISTPL_CFTABLE_ENTRY, cftuple, 256);
+       if (cftuple_len < 3)
+               return 0;
+#ifdef DEBUG
+       else
+               print_hex_dump(KERN_WARNING, "cftable: ", DUMP_PREFIX_NONE, 8,
+                              sizeof(char), cftuple, cftuple_len, false);
+#endif
+
+       /* build tuple_t struct and call pcmcia_parse_tuple */
+       cftable_tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
+       cftable_tuple.TupleCode = CISTPL_CFTABLE_ENTRY;
+       cftable_tuple.TupleData = &cftuple[2];
+       cftable_tuple.TupleDataLen = cftuple_len - 2;
+       cftable_tuple.TupleDataMax = cftuple_len - 2;
+
+       if (pcmcia_parse_tuple(&cftable_tuple, (cisparse_t *)&cftable_entry))

Can't you avoid the cast, by changing the type of cftable_entry?
Perhaps you don't want to do that, to avoid abusing it below, but
perhaps you can use container_of() instead of the cast?

I think you should reset apne_100_mbit to zero if apne_100_mbit < 0
&& !pcmcia_is_16bit(), so rmmod + switching card + modprobe
has a chance to work.

+#endif
+
        if (!init_pcmcia()) {
                /* XXX: shouldn't we re-enable irq here? */
                free_netdev(dev);

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Hi Geert,

thanks for your review!

On 18/11/21 03:42, Geert Uytterhoeven wrote:

Hi Michael,

On Mon, Nov 15, 2021 at 12:40 AM Michael Schmitz [off-list ref] wrote:

quoted

Add module parameter, IO mode autoprobe and PCMCIA reset code
required to support 100 Mbit PCMCIA ethernet cards on Amiga.

10 Mbit and 100 Mbit mode are supported by the same module.
Use the core PCMCIA cftable parser to detect 16 bit cards,
and automatically enable 16 bit ISA IO access for those cards
by changing isa_type at runtime. The user must select PCCARD
and PCMCIA in the kernel config to make the necessary support
modules available

Code to reset the PCMCIA hardware required for 16 bit cards is
also added to the driver probe.

An optional module parameter switches Amiga ISA IO accessors
to 8 or 16 bit access in case autoprobe fails.

Patch modified after patch "[PATCH RFC net-next] Amiga PCMCIA
100 MBit card support" submitted to netdev 2018/09/16 by Alex
Kazik [off-list ref].

CC: netdev@vger.kernel.org
Link: https://lore.kernel.org/r/1622958877-2026-1-git-send-email-schmitzmic@gmail.com
Tested-by: Alex Kazik <redacted>
Signed-off-by: Michael Schmitz <schmitzmic@gmail.com>

Thanks for your patch!

quoted

--- a/drivers/net/ethernet/8390/apne.c
+++ b/drivers/net/ethernet/8390/apne.c

@@ -119,6 +119,48 @@ static u32 apne_msg_enable;
 module_param_named(msg_enable, apne_msg_enable, uint, 0444);
 MODULE_PARM_DESC(msg_enable, "Debug message level (see linux/netdevice.h for bitmap)");

+static int apne_100_mbit = -1;
+module_param_named(100_mbit, apne_100_mbit, int, 0444);
+MODULE_PARM_DESC(100_mbit, "Enable 100 Mbit support");
+
+#if IS_ENABLED(CONFIG_PCMCIA)

What if CONFIG_PCMIA=m, and CONFIG_APNE=y?

Fails to build (undefined reference to `pcmcia_parse_tuple').

That's what 'select PCMCIA' was avoiding before, but got vetoed. I can 
add a dependency on PCMCIA in the APNE Kconfig entry which does force 
APNE the same as what's selected for PCMCIA, but that means we can't 
build APNE without PCMCIA anymore. Is there a way to express 'constrain 
build type if PCMCIA is enabled, else leave choice to user' ??

quoted

+static int pcmcia_is_16bit(void)
+{
+       u_char cftuple[258];
+       int cftuple_len;
+       tuple_t cftable_tuple;
+       cistpl_cftable_entry_t cftable_entry;
+
+       cftuple_len = pcmcia_copy_tuple(CISTPL_CFTABLE_ENTRY, cftuple, 256);
+       if (cftuple_len < 3)
+               return 0;
+#ifdef DEBUG
+       else
+               print_hex_dump(KERN_WARNING, "cftable: ", DUMP_PREFIX_NONE, 8,
+                              sizeof(char), cftuple, cftuple_len, false);
+#endif
+
+       /* build tuple_t struct and call pcmcia_parse_tuple */
+       cftable_tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
+       cftable_tuple.TupleCode = CISTPL_CFTABLE_ENTRY;
+       cftable_tuple.TupleData = &cftuple[2];
+       cftable_tuple.TupleDataLen = cftuple_len - 2;
+       cftable_tuple.TupleDataMax = cftuple_len - 2;
+
+       if (pcmcia_parse_tuple(&cftable_tuple, (cisparse_t *)&cftable_entry))

Can't you avoid the cast, by changing the type of cftable_entry?

Sure, could declare cisparse_t cfparse above, and prepend cfparse. at 
all uses of cftable_entry below.

Perhaps you don't want to do that, to avoid abusing it below, but
perhaps you can use container_of() instead of the cast?

Wasn't sure container_of() works with unions, but that seems to avoid 
the cast OK as well.

quoted

+               return 0;
+
+#ifdef DEBUG
+       pr_info("IO flags: %x\n", cftable_entry.io.flags);
+#endif
+
+       if (cftable_entry.io.flags & CISTPL_IO_16BIT)
+               return 1;
+
+       return 0;
+}
+#endif
+
 static struct net_device * __init apne_probe(void)
 {
        struct net_device *dev;

@@ -140,6 +182,13 @@ static struct net_device * __init apne_probe(void)

        pr_info("Looking for PCMCIA ethernet card : ");

+       if (apne_100_mbit == 1)
+               isa_type = ISA_TYPE_AG16;
+       else if (apne_100_mbit == 0)
+               isa_type = ISA_TYPE_AG;
+       else
+               pr_cont(" (autoprobing 16 bit mode) ");
+
        /* check if a card is inserted */
        if (!(PCMCIA_INSERTED)) {
                pr_cont("NO PCMCIA card inserted\n");

@@ -167,6 +216,14 @@ static struct net_device * __init apne_probe(void)

        pr_cont("ethernet PCMCIA card inserted\n");

+#if IS_ENABLED(CONFIG_PCMCIA)
+       if (apne_100_mbit < 0 && pcmcia_is_16bit()) {
+               pr_info("16-bit PCMCIA card detected!\n");
+               isa_type = ISA_TYPE_AG16;
+               apne_100_mbit = 1;
+       }

I think you should reset apne_100_mbit to zero if apne_100_mbit < 0
&& !pcmcia_is_16bit(), so rmmod + switching card + modprobe
has a chance to work.

Good catch - though when switching to another card using this same 
driver, the module parameter can be used again to select IO mode or 
force autoprobe.

I'll wait for your response about the sysfs parameter issue before 
sending out v12.

Cheers,

	Michael

quoted

+#endif
+
        if (!init_pcmcia()) {
                /* XXX: shouldn't we re-enable irq here? */
                free_netdev(dev);

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Hi Michael,

On Thu, Nov 18, 2021 at 5:58 AM Michael Schmitz [off-list ref] wrote:

On 18/11/21 03:42, Geert Uytterhoeven wrote:

quoted

On Mon, Nov 15, 2021 at 12:40 AM Michael Schmitz [off-list ref] wrote:

quoted

Add module parameter, IO mode autoprobe and PCMCIA reset code
required to support 100 Mbit PCMCIA ethernet cards on Amiga.

10 Mbit and 100 Mbit mode are supported by the same module.
Use the core PCMCIA cftable parser to detect 16 bit cards,
and automatically enable 16 bit ISA IO access for those cards
by changing isa_type at runtime. The user must select PCCARD
and PCMCIA in the kernel config to make the necessary support
modules available

Code to reset the PCMCIA hardware required for 16 bit cards is
also added to the driver probe.

An optional module parameter switches Amiga ISA IO accessors
to 8 or 16 bit access in case autoprobe fails.

Patch modified after patch "[PATCH RFC net-next] Amiga PCMCIA
100 MBit card support" submitted to netdev 2018/09/16 by Alex
Kazik [off-list ref].

CC: netdev@vger.kernel.org
Link: https://lore.kernel.org/r/1622958877-2026-1-git-send-email-schmitzmic@gmail.com
Tested-by: Alex Kazik <redacted>
Signed-off-by: Michael Schmitz <schmitzmic@gmail.com>

quoted

quoted

--- a/drivers/net/ethernet/8390/apne.c
+++ b/drivers/net/ethernet/8390/apne.c

@@ -119,6 +119,48 @@ static u32 apne_msg_enable;
 module_param_named(msg_enable, apne_msg_enable, uint, 0444);
 MODULE_PARM_DESC(msg_enable, "Debug message level (see linux/netdevice.h for bitmap)");

+static int apne_100_mbit = -1;
+module_param_named(100_mbit, apne_100_mbit, int, 0444);
+MODULE_PARM_DESC(100_mbit, "Enable 100 Mbit support");
+
+#if IS_ENABLED(CONFIG_PCMCIA)

What if CONFIG_PCMIA=m, and CONFIG_APNE=y?

Fails to build (undefined reference to `pcmcia_parse_tuple').

That's what 'select PCMCIA' was avoiding before, but got vetoed. I can
add a dependency on PCMCIA in the APNE Kconfig entry which does force
APNE the same as what's selected for PCMCIA, but that means we can't
build APNE without PCMCIA anymore. Is there a way to express 'constrain
build type if PCMCIA is enabled, else leave choice to user' ??

#if IS_REACHABLE(CONFIG_PCMIA)

quoted

quoted

@@ -140,6 +182,13 @@ static struct net_device * __init apne_probe(void)

        pr_info("Looking for PCMCIA ethernet card : ");

+       if (apne_100_mbit == 1)
+               isa_type = ISA_TYPE_AG16;
+       else if (apne_100_mbit == 0)
+               isa_type = ISA_TYPE_AG;
+       else
+               pr_cont(" (autoprobing 16 bit mode) ");
+
        /* check if a card is inserted */
        if (!(PCMCIA_INSERTED)) {
                pr_cont("NO PCMCIA card inserted\n");

@@ -167,6 +216,14 @@ static struct net_device * __init apne_probe(void)

        pr_cont("ethernet PCMCIA card inserted\n");

+#if IS_ENABLED(CONFIG_PCMCIA)
+       if (apne_100_mbit < 0 && pcmcia_is_16bit()) {
+               pr_info("16-bit PCMCIA card detected!\n");
+               isa_type = ISA_TYPE_AG16;
+               apne_100_mbit = 1;
+       }

I think you should reset apne_100_mbit to zero if apne_100_mbit < 0
&& !pcmcia_is_16bit(), so rmmod + switching card + modprobe
has a chance to work.

Good catch - though when switching to another card using this same
driver, the module parameter can be used again to select IO mode or
force autoprobe.

The autoprobe won't work if the new card is 8-bit.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Hi Geert,

On 18/11/21 21:01, Geert Uytterhoeven wrote:

quoted

quoted

quoted

--- a/drivers/net/ethernet/8390/apne.c
+++ b/drivers/net/ethernet/8390/apne.c

@@ -119,6 +119,48 @@ static u32 apne_msg_enable;
 module_param_named(msg_enable, apne_msg_enable, uint, 0444);
 MODULE_PARM_DESC(msg_enable, "Debug message level (see linux/netdevice.h for bitmap)");

+static int apne_100_mbit = -1;
+module_param_named(100_mbit, apne_100_mbit, int, 0444);
+MODULE_PARM_DESC(100_mbit, "Enable 100 Mbit support");
+
+#if IS_ENABLED(CONFIG_PCMCIA)

What if CONFIG_PCMIA=m, and CONFIG_APNE=y?

Fails to build (undefined reference to `pcmcia_parse_tuple').

That's what 'select PCMCIA' was avoiding before, but got vetoed. I can
add a dependency on PCMCIA in the APNE Kconfig entry which does force
APNE the same as what's selected for PCMCIA, but that means we can't
build APNE without PCMCIA anymore. Is there a way to express 'constrain
build type if PCMCIA is enabled, else leave choice to user' ??

#if IS_REACHABLE(CONFIG_PCMIA)

Thanks, I'll use that then.

quoted

quoted

quoted

@@ -140,6 +182,13 @@ static struct net_device * __init apne_probe(void)

        pr_info("Looking for PCMCIA ethernet card : ");

+       if (apne_100_mbit == 1)
+               isa_type = ISA_TYPE_AG16;
+       else if (apne_100_mbit == 0)
+               isa_type = ISA_TYPE_AG;
+       else
+               pr_cont(" (autoprobing 16 bit mode) ");
+
        /* check if a card is inserted */
        if (!(PCMCIA_INSERTED)) {
                pr_cont("NO PCMCIA card inserted\n");

@@ -167,6 +216,14 @@ static struct net_device * __init apne_probe(void)

        pr_cont("ethernet PCMCIA card inserted\n");

+#if IS_ENABLED(CONFIG_PCMCIA)
+       if (apne_100_mbit < 0 && pcmcia_is_16bit()) {
+               pr_info("16-bit PCMCIA card detected!\n");
+               isa_type = ISA_TYPE_AG16;
+               apne_100_mbit = 1;
+       }

I think you should reset apne_100_mbit to zero if apne_100_mbit < 0
&& !pcmcia_is_16bit(), so rmmod + switching card + modprobe
has a chance to work.

Good catch - though when switching to another card using this same
driver, the module parameter can be used again to select IO mode or
force autoprobe.

The autoprobe won't work if the new card is 8-bit.

I see now - adding code to set isa_type to 8 bit if the autoprobe fails, 
and reset isa_type and apne_100_mbit to defaults in module exit and the 
probe error return path ...

Cheers,

	Michael

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

On Mon, 2021-11-15 at 12:40 +1300, Michael Schmitz wrote:

Add module parameter, IO mode autoprobe and PCMCIA reset code
required to support 100 Mbit PCMCIA ethernet cards on Amiga.

[]

[]

[]

+	cftuple_len = pcmcia_copy_tuple(CISTPL_CFTABLE_ENTRY, cftuple, 256);
+	if (cftuple_len < 3)
+		return 0;
+#ifdef DEBUG
+	else
+		print_hex_dump(KERN_WARNING, "cftable: ", DUMP_PREFIX_NONE, 8,
+			       sizeof(char), cftuple, cftuple_len, false);
+#endif

Why KERN_WARNING and why not use print_hex_dump_debug without the #ifdef

[]

+#ifdef DEBUG
+	pr_info("IO flags: %x\n", cftable_entry.io.flags);

pr_debug ?

Hi Joe,

thanks for your review!

On 19/11/21 08:18, Joe Perches wrote:

On Mon, 2021-11-15 at 12:40 +1300, Michael Schmitz wrote:

quoted

Add module parameter, IO mode autoprobe and PCMCIA reset code
required to support 100 Mbit PCMCIA ethernet cards on Amiga.

[]

quoted

diff --git a/drivers/net/ethernet/8390/apne.c b/drivers/net/ethernet/8390/apne.c

[]

quoted

@@ -119,6 +119,48 @@ static u32 apne_msg_enable;

[]

quoted

+	cftuple_len = pcmcia_copy_tuple(CISTPL_CFTABLE_ENTRY, cftuple, 256);
+	if (cftuple_len < 3)
+		return 0;
+#ifdef DEBUG
+	else
+		print_hex_dump(KERN_WARNING, "cftable: ", DUMP_PREFIX_NONE, 8,
+			       sizeof(char), cftuple, cftuple_len, false);
+#endif

Why KERN_WARNING and why not use print_hex_dump_debug without the #ifdef

No particular reason - head still stuck in the '90 perhaps.

[]

quoted

+#ifdef DEBUG
+	pr_info("IO flags: %x\n", cftable_entry.io.flags);

pr_debug ?

Both changed now, thanks!

Regards,

	Michael Schmitz