Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* linux/arch/i386/kernel/scx200.c |
| 2 | |
| 3 | Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com> |
| 4 | |
| 5 | National Semiconductor SCx200 support. */ |
| 6 | |
| 7 | #include <linux/config.h> |
| 8 | #include <linux/module.h> |
| 9 | #include <linux/errno.h> |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/pci.h> |
| 13 | |
| 14 | #include <linux/scx200.h> |
| 15 | |
| 16 | /* Verify that the configuration block really is there */ |
| 17 | #define scx200_cb_probe(base) (inw((base) + SCx200_CBA) == (base)) |
| 18 | |
| 19 | #define NAME "scx200" |
| 20 | |
| 21 | MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>"); |
| 22 | MODULE_DESCRIPTION("NatSemi SCx200 Driver"); |
| 23 | MODULE_LICENSE("GPL"); |
| 24 | |
| 25 | unsigned scx200_gpio_base = 0; |
| 26 | long scx200_gpio_shadow[2]; |
| 27 | |
| 28 | unsigned scx200_cb_base = 0; |
| 29 | |
| 30 | static struct pci_device_id scx200_tbl[] = { |
| 31 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE) }, |
| 32 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE) }, |
| 33 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_XBUS) }, |
| 34 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_XBUS) }, |
| 35 | { }, |
| 36 | }; |
| 37 | MODULE_DEVICE_TABLE(pci,scx200_tbl); |
| 38 | |
| 39 | static int __devinit scx200_probe(struct pci_dev *, const struct pci_device_id *); |
| 40 | |
| 41 | static struct pci_driver scx200_pci_driver = { |
| 42 | .name = "scx200", |
| 43 | .id_table = scx200_tbl, |
| 44 | .probe = scx200_probe, |
| 45 | }; |
| 46 | |
| 47 | static DEFINE_SPINLOCK(scx200_gpio_config_lock); |
| 48 | |
| 49 | static int __devinit scx200_probe(struct pci_dev *pdev, const struct pci_device_id *ent) |
| 50 | { |
| 51 | int bank; |
| 52 | unsigned base; |
| 53 | |
| 54 | if (pdev->device == PCI_DEVICE_ID_NS_SCx200_BRIDGE || |
| 55 | pdev->device == PCI_DEVICE_ID_NS_SC1100_BRIDGE) { |
| 56 | base = pci_resource_start(pdev, 0); |
| 57 | printk(KERN_INFO NAME ": GPIO base 0x%x\n", base); |
| 58 | |
| 59 | if (request_region(base, SCx200_GPIO_SIZE, "NatSemi SCx200 GPIO") == 0) { |
| 60 | printk(KERN_ERR NAME ": can't allocate I/O for GPIOs\n"); |
| 61 | return -EBUSY; |
| 62 | } |
| 63 | |
| 64 | scx200_gpio_base = base; |
| 65 | |
| 66 | /* read the current values driven on the GPIO signals */ |
| 67 | for (bank = 0; bank < 2; ++bank) |
| 68 | scx200_gpio_shadow[bank] = inl(scx200_gpio_base + 0x10 * bank); |
| 69 | |
| 70 | } else { |
| 71 | /* find the base of the Configuration Block */ |
| 72 | if (scx200_cb_probe(SCx200_CB_BASE_FIXED)) { |
| 73 | scx200_cb_base = SCx200_CB_BASE_FIXED; |
| 74 | } else { |
| 75 | pci_read_config_dword(pdev, SCx200_CBA_SCRATCH, &base); |
| 76 | if (scx200_cb_probe(base)) { |
| 77 | scx200_cb_base = base; |
| 78 | } else { |
| 79 | printk(KERN_WARNING NAME ": Configuration Block not found\n"); |
| 80 | return -ENODEV; |
| 81 | } |
| 82 | } |
| 83 | printk(KERN_INFO NAME ": Configuration Block base 0x%x\n", scx200_cb_base); |
| 84 | } |
| 85 | |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | u32 scx200_gpio_configure(int index, u32 mask, u32 bits) |
| 90 | { |
| 91 | u32 config, new_config; |
| 92 | unsigned long flags; |
| 93 | |
| 94 | spin_lock_irqsave(&scx200_gpio_config_lock, flags); |
| 95 | |
| 96 | outl(index, scx200_gpio_base + 0x20); |
| 97 | config = inl(scx200_gpio_base + 0x24); |
| 98 | |
| 99 | new_config = (config & mask) | bits; |
| 100 | outl(new_config, scx200_gpio_base + 0x24); |
| 101 | |
| 102 | spin_unlock_irqrestore(&scx200_gpio_config_lock, flags); |
| 103 | |
| 104 | return config; |
| 105 | } |
| 106 | |
| 107 | #if 0 |
| 108 | void scx200_gpio_dump(unsigned index) |
| 109 | { |
| 110 | u32 config = scx200_gpio_configure(index, ~0, 0); |
| 111 | printk(KERN_DEBUG "GPIO%02u: 0x%08lx", index, (unsigned long)config); |
| 112 | |
| 113 | if (config & 1) |
| 114 | printk(" OE"); /* output enabled */ |
| 115 | else |
| 116 | printk(" TS"); /* tristate */ |
| 117 | if (config & 2) |
| 118 | printk(" PP"); /* push pull */ |
| 119 | else |
| 120 | printk(" OD"); /* open drain */ |
| 121 | if (config & 4) |
| 122 | printk(" PUE"); /* pull up enabled */ |
| 123 | else |
| 124 | printk(" PUD"); /* pull up disabled */ |
| 125 | if (config & 8) |
| 126 | printk(" LOCKED"); /* locked */ |
| 127 | if (config & 16) |
| 128 | printk(" LEVEL"); /* level input */ |
| 129 | else |
| 130 | printk(" EDGE"); /* edge input */ |
| 131 | if (config & 32) |
| 132 | printk(" HI"); /* trigger on rising edge */ |
| 133 | else |
| 134 | printk(" LO"); /* trigger on falling edge */ |
| 135 | if (config & 64) |
| 136 | printk(" DEBOUNCE"); /* debounce */ |
| 137 | printk("\n"); |
| 138 | } |
| 139 | #endif /* 0 */ |
| 140 | |
| 141 | static int __init scx200_init(void) |
| 142 | { |
| 143 | printk(KERN_INFO NAME ": NatSemi SCx200 Driver\n"); |
| 144 | |
| 145 | return pci_module_init(&scx200_pci_driver); |
| 146 | } |
| 147 | |
| 148 | static void __exit scx200_cleanup(void) |
| 149 | { |
| 150 | pci_unregister_driver(&scx200_pci_driver); |
| 151 | release_region(scx200_gpio_base, SCx200_GPIO_SIZE); |
| 152 | } |
| 153 | |
| 154 | module_init(scx200_init); |
| 155 | module_exit(scx200_cleanup); |
| 156 | |
| 157 | EXPORT_SYMBOL(scx200_gpio_base); |
| 158 | EXPORT_SYMBOL(scx200_gpio_shadow); |
| 159 | EXPORT_SYMBOL(scx200_gpio_configure); |
| 160 | EXPORT_SYMBOL(scx200_cb_base); |
| 161 | |
| 162 | /* |
| 163 | Local variables: |
| 164 | compile-command: "make -k -C ../../.. SUBDIRS=arch/i386/kernel modules" |
| 165 | c-basic-offset: 8 |
| 166 | End: |
| 167 | */ |