1 /* 2 * Virtual EISA root driver. 3 * Acts as a placeholder if we don't have a proper EISA bridge. 4 * 5 * (C) 2003 Marc Zyngier <maz@wild-wind.fr.eu.org> 6 * 7 * This code is released under the GPL version 2. 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/platform_device.h> 12 #include <linux/eisa.h> 13 #include <linux/module.h> 14 #include <linux/moduleparam.h> 15 #include <linux/init.h> 16 17 #if defined(CONFIG_ALPHA_JENSEN) || defined(CONFIG_EISA_VLB_PRIMING) 18 #define EISA_FORCE_PROBE_DEFAULT 1 19 #else 20 #define EISA_FORCE_PROBE_DEFAULT 0 21 #endif 22 23 static int force_probe = EISA_FORCE_PROBE_DEFAULT; 24 static void virtual_eisa_release (struct device *); 25 26 /* The default EISA device parent (virtual root device). 27 * Now use a platform device, since that's the obvious choice. */ 28 29 static struct platform_device eisa_root_dev = { 30 .name = "eisa", 31 .id = 0, 32 .dev = { 33 .release = virtual_eisa_release, 34 }, 35 }; 36 37 static struct eisa_root_device eisa_bus_root = { 38 .dev = &eisa_root_dev.dev, 39 .bus_base_addr = 0, 40 .res = &ioport_resource, 41 .slots = EISA_MAX_SLOTS, 42 .dma_mask = 0xffffffff, 43 }; 44 45 static void virtual_eisa_release (struct device *dev) 46 { 47 /* nothing really to do here */ 48 } 49 50 static int __init virtual_eisa_root_init (void) 51 { 52 int r; 53 54 if ((r = platform_device_register (&eisa_root_dev))) { 55 return r; 56 } 57 58 eisa_bus_root.force_probe = force_probe; 59 60 dev_set_drvdata(&eisa_root_dev.dev, &eisa_bus_root); 61 62 if (eisa_root_register (&eisa_bus_root)) { 63 /* A real bridge may have been registered before 64 * us. So quietly unregister. */ 65 platform_device_unregister (&eisa_root_dev); 66 return -1; 67 } 68 69 return 0; 70 } 71 72 module_param (force_probe, int, 0444); 73 74 device_initcall (virtual_eisa_root_init); 75