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 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 unsigned long scx200_gpio_shadow[2]; 27 28 unsigned scx200_cb_base = 0; 29 30 static 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 }; 37 MODULE_DEVICE_TABLE(pci,scx200_tbl); 38 39 static int 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_MUTEX(scx200_gpio_config_lock); 48 49 static 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 58 static 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 95 u32 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 } 111 112 static int __init scx200_init(void) 113 { 114 pr_info("NatSemi SCx200 Driver\n"); 115 return pci_register_driver(&scx200_pci_driver); 116 } 117 118 static void __exit scx200_cleanup(void) 119 { 120 pci_unregister_driver(&scx200_pci_driver); 121 release_region(scx200_gpio_base, SCx200_GPIO_SIZE); 122 } 123 124 module_init(scx200_init); 125 module_exit(scx200_cleanup); 126 127 EXPORT_SYMBOL(scx200_gpio_base); 128 EXPORT_SYMBOL(scx200_gpio_shadow); 129 EXPORT_SYMBOL(scx200_gpio_configure); 130 EXPORT_SYMBOL(scx200_cb_base); 131