net/8390: apne.c - add 100 Mbit support to apne.c driver

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>.

Signed-off-by: Michael Schmitz <schmitzmic@gmail.com>

drivers/net/ethernet/8390/Kconfig

@@ -143,6 +143,19 @@ config APNE
 	  To compile this driver as a module, choose M here: the module
 	  will be called apne.
 
+if APNE
+config APNE100MBIT
+	bool "PCMCIA NE2000 100MBit support"
+	default n
+	---help---
+	  This changes the driver to support 10/100Mbit cards (e.g. Netgear
+	  FA411, CNet Singlepoint). 10 MBit cards and 100 MBit cards are
+	  supported by the same driver.
+
+	  To activate 100 Mbit support at runtime, use the apne100 module
+	  parameter. 
+endif
+
 config PCMCIA_PCNET
 	tristate "NE2000 compatible PCMCIA support"
 	depends on PCMCIA

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 u32 apne_100_mbit;
+module_param_named(apne_100_mbit, uint, 0);
+MODULE_PARM_DESC(apne_100_mbit, "Enable 100 Mbit support");
+
 struct net_device * __init apne_probe(int unit)
 {
 	struct net_device *dev;
@@ -139,6 +143,9 @@ struct net_device * __init apne_probe(int unit)
 	if ( !(AMIGAHW_PRESENT(PCMCIA)) )
 		return ERR_PTR(-ENODEV);
 
+        if (apne_100_mbit)
+                isa_type = ISA_TYPE_AG100;
+
 	pr_info("Looking for PCMCIA ethernet card : ");
 
 	/* check if a card is inserted */
@@ -590,6 +597,16 @@ static int init_pcmcia(void)
 #endif
 	u_long offset;
 
+#ifdef CONFIG_APNE100MBIT
+	/* reset card (idea taken from CardReset by Artur Pogoda) */
+	{
+		u_char  tmp = gayle.intreq;
+
+		gayle.intreq = 0xff;    mdelay(1);
+		gayle.intreq = tmp;     mdelay(300);
+	}
+#endif
+
 	pcmcia_reset();
 	pcmcia_program_voltage(PCMCIA_0V);
 	pcmcia_access_speed(PCMCIA_SPEED_250NS);