m68k/atari: EtherNAT - platform device and IRQ support code

Add platform device and interrupt definitions necessary for the EtherNAT
Ethernet/USB adapter for the Falcon extension port. EtherNAT interrupt
numbers are 139/140 so the max. interrupt number for Atari has to be
increased.

[Geert] Conditionalize platform device data structures

Signed-off-by: Michael Schmitz <schmitz@debian.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

arch/m68k/Kconfig.devices

@@ -55,6 +55,16 @@ config NFETH
 	  which will emulate a regular ethernet device while presenting an
 	  ethertap device to the host system.
 
+config ATARI_ETHERNAT
+	bool "Atari EtherNAT Ethernet support"
+	depends on ATARI
+	---help---
+	  Say Y to include support for the EtherNAT network adapter for the
+	  CT/60 extension port.
+
+	  To compile the actual ethernet driver, choose Y or M for the SMC91X
+	  option in the network device section; the module will be called smc91x.
+
 endmenu
 
 menu "Character devices"

arch/m68k/atari/config.c

@@ -31,6 +31,7 @@
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/ioport.h>
+#include <linux/platform_device.h>
 #include <linux/vt_kern.h>
 #include <linux/module.h>
 
@@ -655,3 +656,66 @@ static void atari_get_hardware_list(struct seq_file *m)
 	ATARIHW_ANNOUNCE(VME, "VME Bus");
 	ATARIHW_ANNOUNCE(DSP56K, "DSP56001 processor");
 }
+
+/*
+ * MSch: initial platform device support for Atari,
+ * required for EtherNAT driver
+ */
+
+#ifdef CONFIG_ATARI_ETHERNAT
+/*
+ * EtherNAT: SMC91C111 Ethernet chipset, handled by smc91x driver
+ */
+
+#define ATARI_ETHERNAT_IRQ		140
+
+static struct resource smc91x_resources[] = {
+	[0] = {
+		.name	= "smc91x-regs",
+		.start	= ATARI_ETHERNAT_PHYS_ADDR,
+		.end	= ATARI_ETHERNAT_PHYS_ADDR + 0xfffff,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.name	= "smc91x-irq",
+		.start	= ATARI_ETHERNAT_IRQ,
+		.end	= ATARI_ETHERNAT_IRQ,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static struct platform_device smc91x_device = {
+	.name		= "smc91x",
+	.id		= -1,
+	.num_resources	= ARRAY_SIZE(smc91x_resources),
+	.resource	= smc91x_resources,
+};
+
+static struct platform_device *atari_ethernat_devices[] __initdata = {
+	&smc91x_device
+};
+#endif /* CONFIG_ATARI_ETHERNAT */
+
+int __init atari_platform_init(void)
+{
+	int rv = 0;
+
+	if (!MACH_IS_ATARI)
+		return -ENODEV;
+
+#ifdef CONFIG_ATARI_ETHERNAT
+	{
+		unsigned char *enatc_virt;
+		enatc_virt = (unsigned char *)ioremap((ATARI_ETHERNAT_PHYS_ADDR+0x23), 0xf);
+		if (hwreg_present(enatc_virt)) {
+			rv = platform_add_devices(atari_ethernat_devices,
+						ARRAY_SIZE(atari_ethernat_devices));
+		}
+		iounmap(enatc_virt);
+	}
+#endif
+
+	return rv;
+}
+
+arch_initcall(atari_platform_init);

arch/m68k/include/asm/atarihw.h

@@ -805,5 +805,11 @@ struct MSTE_RTC {
 
 #define mste_rtc ((*(volatile struct MSTE_RTC *)MSTE_RTC_BAS))
 
+/*
+** EtherNAT add-on card for Falcon - combined ethernet and USB adapter
+*/
+
+#define ATARI_ETHERNAT_PHYS_ADDR	0x80000000
+
 #endif /* linux/atarihw.h */
 

arch/m68k/include/asm/atariints.h

@@ -32,7 +32,7 @@
 #define VME_SOURCE_BASE    56
 #define VME_MAX_SOURCES    16
 
-#define NUM_ATARI_SOURCES   (VME_SOURCE_BASE+VME_MAX_SOURCES-STMFP_SOURCE_BASE)
+#define NUM_ATARI_SOURCES  141
 
 /* convert vector number to int source number */
 #define IRQ_VECTOR_TO_SOURCE(v)	((v) - ((v) < 0x20 ? 0x18 : (0x40-8)))

arch/m68k/include/asm/irq.h

@@ -6,12 +6,16 @@
  * different m68k hosts compiled into the kernel.
  * Currently the Atari has 72 and the Amiga 24, but if both are
  * supported in the kernel it is better to make room for 72.
+ * With EtherNAT add-on card on Atari, the highest interrupt
+ * number is 140 so NR_IRQS needs to be 141.
  */
 #if defined(CONFIG_COLDFIRE)
 #define NR_IRQS 256
 #elif defined(CONFIG_VME) || defined(CONFIG_SUN3) || defined(CONFIG_SUN3X)
 #define NR_IRQS 200
-#elif defined(CONFIG_ATARI) || defined(CONFIG_MAC)
+#elif defined(CONFIG_ATARI)
+#define NR_IRQS 141
+#elif defined(CONFIG_MAC)
 #define NR_IRQS 72
 #elif defined(CONFIG_Q40)
 #define NR_IRQS	43