LXR linux/arch/x86/platform/scx200/scx200

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