netdev - [PATCH RFC net-next] Amiga PCMCIA 100 MBit card support

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Date:   Sat, 15 Sep 2018 22:40:59 +0200
From:   ALeX Kazik <alex@...ik.de>
To:     netdev@...r.kernel.org
Cc:     Linux/m68k <linux-m68k@...r.kernel.org>,
        Rolf Anders <rolf.anders@...sik.uni-augsburg.de>
Subject: [PATCH RFC net-next] Amiga PCMCIA 100 MBit card support

This adds an option to change the (10 MBit only) "apne" driver to support
the 10/100 Mbit cards (e.g. Netgear FA411, CNet Singlepoint) instead.

A new configure option is added as a bool to the apne driver to change the
behaviour to support some new cards instead.
The option can be only enabled if no other 8390 driver is active because the
8390 library is modified when activated.

The patch is initially from http://www.g-mb.de/pcmcia_e.html and adapted by
me from the 2.6 version.

The contained reset fix is required to use a pcmcia card after a reset/reboot,
and is also only activated with new option. (Background, as far as I
understood it: The pcmcia reset line is not connected and after a reset/reboot
the pcmcia card is in an undefined state and needs a manual reset.)
This reset patch is probably useful to all Amiga pcmcia drivers (network and
other) but since I do not own any other card I can't verify that.

Signed-off-by: ALeX Kazik <alex@...ik.de>
Tested-by: ALeX Kazik <alex@...ik.de>

diff -urp linux-4.18.7/drivers/net/ethernet/8390/8390.h linux-4.18.7-patched/drivers/net/ethernet/8390/8390.h
--- linux-4.18.7/drivers/net/ethernet/8390/8390.h	2018-09-09 10:32:43.000000000 +0200
+++ linux-4.18.7-patched/drivers/net/ethernet/8390/8390.h	2018-09-15 14:51:00.000000000 +0200
@@ -222,4 +222,21 @@ struct ei_device {
 #define ENTSR_CDH 0x40	/* The collision detect "heartbeat" signal was lost. */
 #define ENTSR_OWC 0x80  /* There was an out-of-window collision. */
 
+/* Change the driver to support word access instead of byte access.
+ * Cards that work with byte access will not work with word access.
+ */
+#ifdef CONFIG_APNE100MBIT
+/* redefine inb to do word accesses */
+#undef inb
+#define inb(x) ((x) & 1 ? inw((x) - 1) & 0xff : inw(x) >> 8)
+#undef inb_p
+#define inb_p(x) inb(x)
+
+/* The following redefinition of outb isn't necessary, but may be faster on
+ * slow processors.
+ */
+#undef outb
+#define outb(x, y) raw_outb(x, (y) + GAYLE_IO + (((y) & 1) ? GAYLE_ODD : 0))
+#endif
+
 #endif /* _8390_h */
Only in linux-4.18.7-patched/drivers/net/ethernet/8390/: 8390.h.orig
diff -urp linux-4.18.7/drivers/net/ethernet/8390/Kconfig linux-4.18.7-patched/drivers/net/ethernet/8390/Kconfig
--- linux-4.18.7/drivers/net/ethernet/8390/Kconfig	2018-09-09 10:32:43.000000000 +0200
+++ linux-4.18.7-patched/drivers/net/ethernet/8390/Kconfig	2018-09-15 14:34:18.000000000 +0200
@@ -142,6 +142,22 @@ 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
+	depends on ARM_ETHERH=n && AX88796=n && HYDRA=n && MAC8390=n
+	depends on MCF8390=n && NE2000=n && NE2K_PCI=n && PCMCIA_AXNET=n
+	depends on PCMCIA_PCNET=n && STNIC=n && ULTRA=n && WD80x3=n
+	depends on XSURF100=n && ZORRO8390=n
+	---help---
+	  This changes the driver to support ONLY 10/100Mbit cards (e.g. Netgear
+	  FA411, CNet Singlepoint).
+	  Cards that worked with the original version won't with this version.
+
+	  Say N, unless you absolutely know what you are doing.
+endif
+
 config PCMCIA_PCNET
 	tristate "NE2000 compatible PCMCIA support"
 	depends on PCMCIA
diff -urp linux-4.18.7/drivers/net/ethernet/8390/apne.c linux-4.18.7-patched/drivers/net/ethernet/8390/apne.c
--- linux-4.18.7/drivers/net/ethernet/8390/apne.c	2018-09-09 10:32:43.000000000 +0200
+++ linux-4.18.7-patched/drivers/net/ethernet/8390/apne.c	2018-09-15 14:48:27.000000000 +0200
@@ -590,6 +590,16 @@ 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);