Sudeep Dutt | 726526c3 | 2014-07-11 14:04:20 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Intel MIC Platform Software Stack (MPSS) |
| 3 | * |
| 4 | * Copyright(c) 2014 Intel Corporation. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License, version 2, as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | * |
| 15 | * The full GNU General Public License is included in this distribution in |
| 16 | * the file called "COPYING". |
| 17 | * |
| 18 | * Intel MIC Bus driver. |
| 19 | * |
| 20 | * This implementation is very similar to the the virtio bus driver |
| 21 | * implementation @ drivers/virtio/virtio.c |
| 22 | */ |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/idr.h> |
| 26 | #include <linux/mic_bus.h> |
| 27 | |
Sudeep Dutt | 726526c3 | 2014-07-11 14:04:20 -0700 | [diff] [blame] | 28 | static ssize_t device_show(struct device *d, |
| 29 | struct device_attribute *attr, char *buf) |
| 30 | { |
| 31 | struct mbus_device *dev = dev_to_mbus(d); |
| 32 | return sprintf(buf, "0x%04x\n", dev->id.device); |
| 33 | } |
| 34 | static DEVICE_ATTR_RO(device); |
| 35 | |
| 36 | static ssize_t vendor_show(struct device *d, |
| 37 | struct device_attribute *attr, char *buf) |
| 38 | { |
| 39 | struct mbus_device *dev = dev_to_mbus(d); |
| 40 | return sprintf(buf, "0x%04x\n", dev->id.vendor); |
| 41 | } |
| 42 | static DEVICE_ATTR_RO(vendor); |
| 43 | |
| 44 | static ssize_t modalias_show(struct device *d, |
| 45 | struct device_attribute *attr, char *buf) |
| 46 | { |
| 47 | struct mbus_device *dev = dev_to_mbus(d); |
| 48 | return sprintf(buf, "mbus:d%08Xv%08X\n", |
| 49 | dev->id.device, dev->id.vendor); |
| 50 | } |
| 51 | static DEVICE_ATTR_RO(modalias); |
| 52 | |
| 53 | static struct attribute *mbus_dev_attrs[] = { |
| 54 | &dev_attr_device.attr, |
| 55 | &dev_attr_vendor.attr, |
| 56 | &dev_attr_modalias.attr, |
| 57 | NULL, |
| 58 | }; |
| 59 | ATTRIBUTE_GROUPS(mbus_dev); |
| 60 | |
| 61 | static inline int mbus_id_match(const struct mbus_device *dev, |
| 62 | const struct mbus_device_id *id) |
| 63 | { |
| 64 | if (id->device != dev->id.device && id->device != MBUS_DEV_ANY_ID) |
| 65 | return 0; |
| 66 | |
| 67 | return id->vendor == MBUS_DEV_ANY_ID || id->vendor == dev->id.vendor; |
| 68 | } |
| 69 | |
| 70 | /* |
| 71 | * This looks through all the IDs a driver claims to support. If any of them |
| 72 | * match, we return 1 and the kernel will call mbus_dev_probe(). |
| 73 | */ |
| 74 | static int mbus_dev_match(struct device *dv, struct device_driver *dr) |
| 75 | { |
| 76 | unsigned int i; |
| 77 | struct mbus_device *dev = dev_to_mbus(dv); |
| 78 | const struct mbus_device_id *ids; |
| 79 | |
| 80 | ids = drv_to_mbus(dr)->id_table; |
| 81 | for (i = 0; ids[i].device; i++) |
| 82 | if (mbus_id_match(dev, &ids[i])) |
| 83 | return 1; |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | static int mbus_uevent(struct device *dv, struct kobj_uevent_env *env) |
| 88 | { |
| 89 | struct mbus_device *dev = dev_to_mbus(dv); |
| 90 | |
| 91 | return add_uevent_var(env, "MODALIAS=mbus:d%08Xv%08X", |
| 92 | dev->id.device, dev->id.vendor); |
| 93 | } |
| 94 | |
| 95 | static int mbus_dev_probe(struct device *d) |
| 96 | { |
| 97 | int err; |
| 98 | struct mbus_device *dev = dev_to_mbus(d); |
| 99 | struct mbus_driver *drv = drv_to_mbus(dev->dev.driver); |
| 100 | |
| 101 | err = drv->probe(dev); |
| 102 | if (!err) |
| 103 | if (drv->scan) |
| 104 | drv->scan(dev); |
| 105 | return err; |
| 106 | } |
| 107 | |
| 108 | static int mbus_dev_remove(struct device *d) |
| 109 | { |
| 110 | struct mbus_device *dev = dev_to_mbus(d); |
| 111 | struct mbus_driver *drv = drv_to_mbus(dev->dev.driver); |
| 112 | |
| 113 | drv->remove(dev); |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | static struct bus_type mic_bus = { |
| 118 | .name = "mic_bus", |
| 119 | .match = mbus_dev_match, |
| 120 | .dev_groups = mbus_dev_groups, |
| 121 | .uevent = mbus_uevent, |
| 122 | .probe = mbus_dev_probe, |
| 123 | .remove = mbus_dev_remove, |
| 124 | }; |
| 125 | |
| 126 | int mbus_register_driver(struct mbus_driver *driver) |
| 127 | { |
| 128 | driver->driver.bus = &mic_bus; |
| 129 | return driver_register(&driver->driver); |
| 130 | } |
| 131 | EXPORT_SYMBOL_GPL(mbus_register_driver); |
| 132 | |
| 133 | void mbus_unregister_driver(struct mbus_driver *driver) |
| 134 | { |
| 135 | driver_unregister(&driver->driver); |
| 136 | } |
| 137 | EXPORT_SYMBOL_GPL(mbus_unregister_driver); |
| 138 | |
| 139 | static void mbus_release_dev(struct device *d) |
| 140 | { |
| 141 | struct mbus_device *mbdev = dev_to_mbus(d); |
| 142 | kfree(mbdev); |
| 143 | } |
| 144 | |
| 145 | struct mbus_device * |
| 146 | mbus_register_device(struct device *pdev, int id, struct dma_map_ops *dma_ops, |
Ashutosh Dixit | d411e79 | 2015-09-29 18:13:54 -0700 | [diff] [blame] | 147 | struct mbus_hw_ops *hw_ops, int index, |
| 148 | void __iomem *mmio_va) |
Sudeep Dutt | 726526c3 | 2014-07-11 14:04:20 -0700 | [diff] [blame] | 149 | { |
| 150 | int ret; |
| 151 | struct mbus_device *mbdev; |
| 152 | |
| 153 | mbdev = kzalloc(sizeof(*mbdev), GFP_KERNEL); |
| 154 | if (!mbdev) |
| 155 | return ERR_PTR(-ENOMEM); |
| 156 | |
| 157 | mbdev->mmio_va = mmio_va; |
| 158 | mbdev->dev.parent = pdev; |
| 159 | mbdev->id.device = id; |
| 160 | mbdev->id.vendor = MBUS_DEV_ANY_ID; |
| 161 | mbdev->dev.archdata.dma_ops = dma_ops; |
| 162 | mbdev->dev.dma_mask = &mbdev->dev.coherent_dma_mask; |
| 163 | dma_set_mask(&mbdev->dev, DMA_BIT_MASK(64)); |
| 164 | mbdev->dev.release = mbus_release_dev; |
| 165 | mbdev->hw_ops = hw_ops; |
| 166 | mbdev->dev.bus = &mic_bus; |
Ashutosh Dixit | d411e79 | 2015-09-29 18:13:54 -0700 | [diff] [blame] | 167 | mbdev->index = index; |
Sudeep Dutt | 726526c3 | 2014-07-11 14:04:20 -0700 | [diff] [blame] | 168 | dev_set_name(&mbdev->dev, "mbus-dev%u", mbdev->index); |
| 169 | /* |
| 170 | * device_register() causes the bus infrastructure to look for a |
| 171 | * matching driver. |
| 172 | */ |
| 173 | ret = device_register(&mbdev->dev); |
| 174 | if (ret) |
Ashutosh Dixit | d411e79 | 2015-09-29 18:13:54 -0700 | [diff] [blame] | 175 | goto free_mbdev; |
Sudeep Dutt | 726526c3 | 2014-07-11 14:04:20 -0700 | [diff] [blame] | 176 | return mbdev; |
Sudeep Dutt | 726526c3 | 2014-07-11 14:04:20 -0700 | [diff] [blame] | 177 | free_mbdev: |
Geliang Tang | 82ff3ac | 2015-10-11 21:05:13 -0700 | [diff] [blame] | 178 | put_device(&mbdev->dev); |
Sudeep Dutt | 726526c3 | 2014-07-11 14:04:20 -0700 | [diff] [blame] | 179 | return ERR_PTR(ret); |
| 180 | } |
| 181 | EXPORT_SYMBOL_GPL(mbus_register_device); |
| 182 | |
| 183 | void mbus_unregister_device(struct mbus_device *mbdev) |
| 184 | { |
Sudeep Dutt | 726526c3 | 2014-07-11 14:04:20 -0700 | [diff] [blame] | 185 | device_unregister(&mbdev->dev); |
Sudeep Dutt | 726526c3 | 2014-07-11 14:04:20 -0700 | [diff] [blame] | 186 | } |
| 187 | EXPORT_SYMBOL_GPL(mbus_unregister_device); |
| 188 | |
| 189 | static int __init mbus_init(void) |
| 190 | { |
| 191 | return bus_register(&mic_bus); |
| 192 | } |
| 193 | |
| 194 | static void __exit mbus_exit(void) |
| 195 | { |
| 196 | bus_unregister(&mic_bus); |
Sudeep Dutt | 726526c3 | 2014-07-11 14:04:20 -0700 | [diff] [blame] | 197 | } |
| 198 | |
| 199 | core_initcall(mbus_init); |
| 200 | module_exit(mbus_exit); |
| 201 | |
| 202 | MODULE_AUTHOR("Intel Corporation"); |
| 203 | MODULE_DESCRIPTION("Intel(R) MIC Bus driver"); |
| 204 | MODULE_LICENSE("GPL v2"); |