1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // Bus implementation for the NuBus subsystem. 4 // 5 // Copyright (C) 2017 Finn Thain 6 7 #include <linux/device.h> 8 #include <linux/dma-mapping.h> 9 #include <linux/list.h> 10 #include <linux/nubus.h> 11 #include <linux/seq_file.h> 12 #include <linux/slab.h> 13 14 #define to_nubus_board(d) container_of(d, struct nubus_board, dev) 15 #define to_nubus_driver(d) container_of(d, struct nubus_driver, driver) 16 17 static int nubus_bus_match(struct device *dev, struct device_driver *driver) 18 { 19 return 1; 20 } 21 22 static int nubus_device_probe(struct device *dev) 23 { 24 struct nubus_driver *ndrv = to_nubus_driver(dev->driver); 25 int err = -ENODEV; 26 27 if (ndrv->probe) 28 err = ndrv->probe(to_nubus_board(dev)); 29 return err; 30 } 31 32 static int nubus_device_remove(struct device *dev) 33 { 34 struct nubus_driver *ndrv = to_nubus_driver(dev->driver); 35 int err = -ENODEV; 36 37 if (dev->driver && ndrv->remove) 38 err = ndrv->remove(to_nubus_board(dev)); 39 return err; 40 } 41 42 struct bus_type nubus_bus_type = { 43 .name = "nubus", 44 .match = nubus_bus_match, 45 .probe = nubus_device_probe, 46 .remove = nubus_device_remove, 47 }; 48 EXPORT_SYMBOL(nubus_bus_type); 49 50 int nubus_driver_register(struct nubus_driver *ndrv) 51 { 52 ndrv->driver.bus = &nubus_bus_type; 53 return driver_register(&ndrv->driver); 54 } 55 EXPORT_SYMBOL(nubus_driver_register); 56 57 void nubus_driver_unregister(struct nubus_driver *ndrv) 58 { 59 driver_unregister(&ndrv->driver); 60 } 61 EXPORT_SYMBOL(nubus_driver_unregister); 62 63 static struct device nubus_parent = { 64 .init_name = "nubus", 65 }; 66 67 static int __init nubus_bus_register(void) 68 { 69 return bus_register(&nubus_bus_type); 70 } 71 postcore_initcall(nubus_bus_register); 72 73 int __init nubus_parent_device_register(void) 74 { 75 return device_register(&nubus_parent); 76 } 77 78 static void nubus_device_release(struct device *dev) 79 { 80 struct nubus_board *board = to_nubus_board(dev); 81 struct nubus_rsrc *fres, *tmp; 82 83 list_for_each_entry_safe(fres, tmp, &nubus_func_rsrcs, list) 84 if (fres->board == board) { 85 list_del(&fres->list); 86 kfree(fres); 87 } 88 kfree(board); 89 } 90 91 int nubus_device_register(struct nubus_board *board) 92 { 93 board->dev.parent = &nubus_parent; 94 board->dev.release = nubus_device_release; 95 board->dev.bus = &nubus_bus_type; 96 dev_set_name(&board->dev, "slot.%X", board->slot); 97 board->dev.dma_mask = &board->dev.coherent_dma_mask; 98 dma_set_mask(&board->dev, DMA_BIT_MASK(32)); 99 return device_register(&board->dev); 100 } 101 102 static int nubus_print_device_name_fn(struct device *dev, void *data) 103 { 104 struct nubus_board *board = to_nubus_board(dev); 105 struct seq_file *m = data; 106 107 seq_printf(m, "Slot %X: %s\n", board->slot, board->name); 108 return 0; 109 } 110 111 int nubus_proc_show(struct seq_file *m, void *data) 112 { 113 return bus_for_each_dev(&nubus_bus_type, NULL, m, 114 nubus_print_device_name_fn); 115 } 116