+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/ide.h>
+
+int probe_4drives = 0;
+
+module_param_named(probe, probe_4drives, bool, 0);
+MODULE_PARM_DESC(probe, "probe for generic IDE chipset with 4 drives/port");
+
+static int __init ide_4drives_init(void)
+{
+ ide_hwif_t *hwif, *mate;
+ u8 idx[4] = { 0, 1, 0xff, 0xff };
+
+ if (probe_4drives == 0)
+ return -ENODEV;
+
+ hwif = &ide_hwifs[0];
+ mate = &ide_hwifs[1];
+
+ memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
+
+ mate->irq = hwif->irq;
+
+ mate->chipset = hwif->chipset = ide_4drives;
+
+ mate->drives[0].select.all ^= 0x20;
+ mate->drives[1].select.all ^= 0x20;
+
+ hwif->mate = mate;
+ mate->mate = hwif;
+
+ hwif->serialized = mate->serialized = 1;
+
+ ide_device_add(idx, NULL);
+
+ return 0;
+}
+
+module_init(ide_4drives_init);
+
+MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
+MODULE_DESCRIPTION("generic IDE chipset with 4 drives/port support");
+MODULE_LICENSE("GPL");