cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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isa.c (3862B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * ISA bus.
      4 */
      5
      6#include <linux/device.h>
      7#include <linux/kernel.h>
      8#include <linux/slab.h>
      9#include <linux/module.h>
     10#include <linux/init.h>
     11#include <linux/dma-mapping.h>
     12#include <linux/isa.h>
     13
     14static struct device isa_bus = {
     15	.init_name	= "isa"
     16};
     17
     18struct isa_dev {
     19	struct device dev;
     20	struct device *next;
     21	unsigned int id;
     22};
     23
     24#define to_isa_dev(x) container_of((x), struct isa_dev, dev)
     25
     26static int isa_bus_match(struct device *dev, struct device_driver *driver)
     27{
     28	struct isa_driver *isa_driver = to_isa_driver(driver);
     29
     30	if (dev->platform_data == isa_driver) {
     31		if (!isa_driver->match ||
     32			isa_driver->match(dev, to_isa_dev(dev)->id))
     33			return 1;
     34		dev->platform_data = NULL;
     35	}
     36	return 0;
     37}
     38
     39static int isa_bus_probe(struct device *dev)
     40{
     41	struct isa_driver *isa_driver = dev->platform_data;
     42
     43	if (isa_driver && isa_driver->probe)
     44		return isa_driver->probe(dev, to_isa_dev(dev)->id);
     45
     46	return 0;
     47}
     48
     49static void isa_bus_remove(struct device *dev)
     50{
     51	struct isa_driver *isa_driver = dev->platform_data;
     52
     53	if (isa_driver && isa_driver->remove)
     54		isa_driver->remove(dev, to_isa_dev(dev)->id);
     55}
     56
     57static void isa_bus_shutdown(struct device *dev)
     58{
     59	struct isa_driver *isa_driver = dev->platform_data;
     60
     61	if (isa_driver && isa_driver->shutdown)
     62		isa_driver->shutdown(dev, to_isa_dev(dev)->id);
     63}
     64
     65static int isa_bus_suspend(struct device *dev, pm_message_t state)
     66{
     67	struct isa_driver *isa_driver = dev->platform_data;
     68
     69	if (isa_driver && isa_driver->suspend)
     70		return isa_driver->suspend(dev, to_isa_dev(dev)->id, state);
     71
     72	return 0;
     73}
     74
     75static int isa_bus_resume(struct device *dev)
     76{
     77	struct isa_driver *isa_driver = dev->platform_data;
     78
     79	if (isa_driver && isa_driver->resume)
     80		return isa_driver->resume(dev, to_isa_dev(dev)->id);
     81
     82	return 0;
     83}
     84
     85static struct bus_type isa_bus_type = {
     86	.name		= "isa",
     87	.match		= isa_bus_match,
     88	.probe		= isa_bus_probe,
     89	.remove		= isa_bus_remove,
     90	.shutdown	= isa_bus_shutdown,
     91	.suspend	= isa_bus_suspend,
     92	.resume		= isa_bus_resume
     93};
     94
     95static void isa_dev_release(struct device *dev)
     96{
     97	kfree(to_isa_dev(dev));
     98}
     99
    100void isa_unregister_driver(struct isa_driver *isa_driver)
    101{
    102	struct device *dev = isa_driver->devices;
    103
    104	while (dev) {
    105		struct device *tmp = to_isa_dev(dev)->next;
    106		device_unregister(dev);
    107		dev = tmp;
    108	}
    109	driver_unregister(&isa_driver->driver);
    110}
    111EXPORT_SYMBOL_GPL(isa_unregister_driver);
    112
    113int isa_register_driver(struct isa_driver *isa_driver, unsigned int ndev)
    114{
    115	int error;
    116	unsigned int id;
    117
    118	isa_driver->driver.bus	= &isa_bus_type;
    119	isa_driver->devices	= NULL;
    120
    121	error = driver_register(&isa_driver->driver);
    122	if (error)
    123		return error;
    124
    125	for (id = 0; id < ndev; id++) {
    126		struct isa_dev *isa_dev;
    127
    128		isa_dev = kzalloc(sizeof *isa_dev, GFP_KERNEL);
    129		if (!isa_dev) {
    130			error = -ENOMEM;
    131			break;
    132		}
    133
    134		isa_dev->dev.parent	= &isa_bus;
    135		isa_dev->dev.bus	= &isa_bus_type;
    136
    137		dev_set_name(&isa_dev->dev, "%s.%u",
    138			     isa_driver->driver.name, id);
    139		isa_dev->dev.platform_data	= isa_driver;
    140		isa_dev->dev.release		= isa_dev_release;
    141		isa_dev->id			= id;
    142
    143		isa_dev->dev.coherent_dma_mask = DMA_BIT_MASK(24);
    144		isa_dev->dev.dma_mask = &isa_dev->dev.coherent_dma_mask;
    145
    146		error = device_register(&isa_dev->dev);
    147		if (error) {
    148			put_device(&isa_dev->dev);
    149			break;
    150		}
    151
    152		if (isa_dev->dev.platform_data) {
    153			isa_dev->next = isa_driver->devices;
    154			isa_driver->devices = &isa_dev->dev;
    155		} else
    156			device_unregister(&isa_dev->dev);
    157	}
    158
    159	if (!error && !isa_driver->devices)
    160		error = -ENODEV;
    161
    162	if (error)
    163		isa_unregister_driver(isa_driver);
    164
    165	return error;
    166}
    167EXPORT_SYMBOL_GPL(isa_register_driver);
    168
    169static int __init isa_bus_init(void)
    170{
    171	int error;
    172
    173	error = bus_register(&isa_bus_type);
    174	if (!error) {
    175		error = device_register(&isa_bus);
    176		if (error)
    177			bus_unregister(&isa_bus_type);
    178	}
    179	return error;
    180}
    181
    182postcore_initcall(isa_bus_init);