[PATCH net-next v5 2/2] net/8390: apne.c - add 100 Mbit support to apne.c driver

[Michael Schmitz <schmitzmic@gmail.com>]

Add Kconfig option, module parameter 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.
A module parameter switches Amiga ISA IO accessors to word
access by changing isa_type at runtime. Additional code to
reset the PCMCIA hardware is also added to the driver probe.

Patch modified after patch "[PATCH RFC net-next] Amiga PCMCIA
100 MBit card support" submitted to netdev 2018/09/16 by Alex
Kazik <alex@kazik.de>.

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

--
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 |  4 ++++
 drivers/net/ethernet/8390/apne.c  | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/drivers/net/ethernet/8390/Kconfig b/drivers/net/ethernet/8390/Kconfig
index 9f4b302..cf0d8b3 100644
--- a/drivers/net/ethernet/8390/Kconfig
+++ b/drivers/net/ethernet/8390/Kconfig
@@ -143,6 +143,10 @@ 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 at runtime or
+	  from the kernel command line, use the apne.100mbit module parameter.
+
 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 fe6c834..8223e15 100644
--- a/drivers/net/ethernet/8390/apne.c
+++ b/drivers/net/ethernet/8390/apne.c
@@ -120,6 +120,10 @@ 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 bool apne_100_mbit;
+module_param_named(100_mbit, apne_100_mbit, bool, 0644);
+MODULE_PARM_DESC(100_mbit, "Enable 100 Mbit support");
+
 struct net_device * __init apne_probe(int unit)
 {
 	struct net_device *dev;
@@ -139,6 +143,11 @@ struct net_device * __init apne_probe(int unit)
 	if ( !(AMIGAHW_PRESENT(PCMCIA)) )
 		return ERR_PTR(-ENODEV);
 
+	if (apne_100_mbit)
+		isa_type = ISA_TYPE_AG16;
+	else
+		isa_type = ISA_TYPE_AG;
+
 	pr_info("Looking for PCMCIA ethernet card : ");
 
 	/* check if a card is inserted */
@@ -147,6 +156,20 @@ struct net_device * __init apne_probe(int unit)
 		return ERR_PTR(-ENODEV);
 	}
 
+	/* Reset card. Who knows what dain-bramaged state it was left in. */
+	{	unsigned long reset_start_time = jiffies;
+
+		outb(inb(IOBASE + NE_RESET), IOBASE + NE_RESET);
+
+		while ((inb(IOBASE + NE_EN0_ISR) & ENISR_RESET) == 0)
+			if (time_after(jiffies, reset_start_time + 2*HZ/100)) {
+				pr_info("Card not found (no reset ack).\n");
+				isa_type=ISA_TYPE_AG16;
+			}
+
+		outb(0xff, IOBASE + NE_EN0_ISR);		/* Ack all intr. */
+	}
+
 	dev = alloc_ei_netdev();
 	if (!dev)
 		return ERR_PTR(-ENOMEM);
@@ -590,6 +613,16 @@ 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);
-- 
2.7.4