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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scx200_32.c (3235B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 *  Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
      4 *
      5 *  National Semiconductor SCx200 support.
      6 */
      7
      8#include <linux/module.h>
      9#include <linux/errno.h>
     10#include <linux/kernel.h>
     11#include <linux/init.h>
     12#include <linux/mutex.h>
     13#include <linux/pci.h>
     14
     15#include <linux/scx200.h>
     16#include <linux/scx200_gpio.h>
     17
     18/* Verify that the configuration block really is there */
     19#define scx200_cb_probe(base) (inw((base) + SCx200_CBA) == (base))
     20
     21MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>");
     22MODULE_DESCRIPTION("NatSemi SCx200 Driver");
     23MODULE_LICENSE("GPL");
     24
     25unsigned scx200_gpio_base = 0;
     26unsigned long scx200_gpio_shadow[2];
     27
     28unsigned scx200_cb_base = 0;
     29
     30static struct pci_device_id scx200_tbl[] = {
     31	{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE) },
     32	{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE) },
     33	{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_XBUS)   },
     34	{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SC1100_XBUS)   },
     35	{ },
     36};
     37MODULE_DEVICE_TABLE(pci,scx200_tbl);
     38
     39static int scx200_probe(struct pci_dev *, const struct pci_device_id *);
     40
     41static struct pci_driver scx200_pci_driver = {
     42	.name = "scx200",
     43	.id_table = scx200_tbl,
     44	.probe = scx200_probe,
     45};
     46
     47static DEFINE_MUTEX(scx200_gpio_config_lock);
     48
     49static void scx200_init_shadow(void)
     50{
     51	int bank;
     52
     53	/* read the current values driven on the GPIO signals */
     54	for (bank = 0; bank < 2; ++bank)
     55		scx200_gpio_shadow[bank] = inl(scx200_gpio_base + 0x10 * bank);
     56}
     57
     58static int scx200_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
     59{
     60	unsigned base;
     61
     62	if (pdev->device == PCI_DEVICE_ID_NS_SCx200_BRIDGE ||
     63	    pdev->device == PCI_DEVICE_ID_NS_SC1100_BRIDGE) {
     64		base = pci_resource_start(pdev, 0);
     65		pr_info("GPIO base 0x%x\n", base);
     66
     67		if (!request_region(base, SCx200_GPIO_SIZE,
     68				    "NatSemi SCx200 GPIO")) {
     69			pr_err("can't allocate I/O for GPIOs\n");
     70			return -EBUSY;
     71		}
     72
     73		scx200_gpio_base = base;
     74		scx200_init_shadow();
     75
     76	} else {
     77		/* find the base of the Configuration Block */
     78		if (scx200_cb_probe(SCx200_CB_BASE_FIXED)) {
     79			scx200_cb_base = SCx200_CB_BASE_FIXED;
     80		} else {
     81			pci_read_config_dword(pdev, SCx200_CBA_SCRATCH, &base);
     82			if (scx200_cb_probe(base)) {
     83				scx200_cb_base = base;
     84			} else {
     85				pr_warn("Configuration Block not found\n");
     86				return -ENODEV;
     87			}
     88		}
     89		pr_info("Configuration Block base 0x%x\n", scx200_cb_base);
     90	}
     91
     92	return 0;
     93}
     94
     95u32 scx200_gpio_configure(unsigned index, u32 mask, u32 bits)
     96{
     97	u32 config, new_config;
     98
     99	mutex_lock(&scx200_gpio_config_lock);
    100
    101	outl(index, scx200_gpio_base + 0x20);
    102	config = inl(scx200_gpio_base + 0x24);
    103
    104	new_config = (config & mask) | bits;
    105	outl(new_config, scx200_gpio_base + 0x24);
    106
    107	mutex_unlock(&scx200_gpio_config_lock);
    108
    109	return config;
    110}
    111
    112static int __init scx200_init(void)
    113{
    114	pr_info("NatSemi SCx200 Driver\n");
    115	return pci_register_driver(&scx200_pci_driver);
    116}
    117
    118static void __exit scx200_cleanup(void)
    119{
    120	pci_unregister_driver(&scx200_pci_driver);
    121	release_region(scx200_gpio_base, SCx200_GPIO_SIZE);
    122}
    123
    124module_init(scx200_init);
    125module_exit(scx200_cleanup);
    126
    127EXPORT_SYMBOL(scx200_gpio_base);
    128EXPORT_SYMBOL(scx200_gpio_shadow);
    129EXPORT_SYMBOL(scx200_gpio_configure);
    130EXPORT_SYMBOL(scx200_cb_base);