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/config.h> 11 #include <linux/kernel.h> 12 #include <linux/platform_device.h> 13 #include <linux/eisa.h> 14 #include <linux/module.h> 15 #include <linux/moduleparam.h> 16 #include <linux/init.h> 17 18 #if defined(CONFIG_ALPHA_JENSEN) || defined(CONFIG_EISA_VLB_PRIMING) 19 #define EISA_FORCE_PROBE_DEFAULT 1 20 #else 21 #define EISA_FORCE_PROBE_DEFAULT 0 22 #endif 23 24 static int force_probe = EISA_FORCE_PROBE_DEFAULT; 25 static void virtual_eisa_release (struct device *); 26 27 /* The default EISA device parent (virtual root device). 28 * Now use a platform device, since that's the obvious choice. */ 29 30 static struct platform_device eisa_root_dev = { 31 .name = "eisa", 32 .id = 0, 33 .dev = { 34 .release = virtual_eisa_release, 35 }, 36 }; 37 38 static struct eisa_root_device eisa_bus_root = { 39 .dev = &eisa_root_dev.dev, 40 .bus_base_addr = 0, 41 .res = &ioport_resource, 42 .slots = EISA_MAX_SLOTS, 43 .dma_mask = 0xffffffff, 44 }; 45 46 static void virtual_eisa_release (struct device *dev) 47 { 48 /* nothing really to do here */ 49 } 50 51 static int virtual_eisa_root_init (void) 52 { 53 int r; 54 55 if ((r = platform_device_register (&eisa_root_dev))) { 56 return r; 57 } 58 59 eisa_bus_root.force_probe = force_probe; 60 61 eisa_root_dev.dev.driver_data = &eisa_bus_root; 62 63 if (eisa_root_register (&eisa_bus_root)) { 64 /* A real bridge may have been registered before 65 * us. So quietly unregister. */ 66 platform_device_unregister (&eisa_root_dev); 67 return -1; 68 } 69 70 return 0; 71 } 72 73 module_param (force_probe, int, 0444); 74 75 device_initcall (virtual_eisa_root_init); 76