2 * Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
4 * National Semiconductor SCx200 support.
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>
14 #include <linux/scx200.h>
15 #include <linux/scx200_gpio.h>
17 /* Verify that the configuration block really is there */
18 #define scx200_cb_probe(base) (inw((base) + SCx200_CBA) == (base))
20 MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>");
21 MODULE_DESCRIPTION("NatSemi SCx200 Driver");
22 MODULE_LICENSE("GPL");
24 unsigned scx200_gpio_base
= 0;
25 unsigned long scx200_gpio_shadow
[2];
27 unsigned scx200_cb_base
= 0;
29 static 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
) },
36 MODULE_DEVICE_TABLE(pci
,scx200_tbl
);
38 static int __devinit
scx200_probe(struct pci_dev
*, const struct pci_device_id
*);
40 static struct pci_driver scx200_pci_driver
= {
42 .id_table
= scx200_tbl
,
43 .probe
= scx200_probe
,
46 static DEFINE_MUTEX(scx200_gpio_config_lock
);
48 static void __devinit
scx200_init_shadow(void)
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
);
57 static int __devinit
scx200_probe(struct pci_dev
*pdev
, const struct pci_device_id
*ent
)
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
);
66 if (!request_region(base
, SCx200_GPIO_SIZE
,
67 "NatSemi SCx200 GPIO")) {
68 pr_err("can't allocate I/O for GPIOs\n");
72 scx200_gpio_base
= base
;
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
;
80 pci_read_config_dword(pdev
, SCx200_CBA_SCRATCH
, &base
);
81 if (scx200_cb_probe(base
)) {
82 scx200_cb_base
= base
;
84 pr_warn("Configuration Block not found\n");
88 pr_info("Configuration Block base 0x%x\n", scx200_cb_base
);
94 u32
scx200_gpio_configure(unsigned index
, u32 mask
, u32 bits
)
96 u32 config
, new_config
;
98 mutex_lock(&scx200_gpio_config_lock
);
100 outl(index
, scx200_gpio_base
+ 0x20);
101 config
= inl(scx200_gpio_base
+ 0x24);
103 new_config
= (config
& mask
) | bits
;
104 outl(new_config
, scx200_gpio_base
+ 0x24);
106 mutex_unlock(&scx200_gpio_config_lock
);
111 static int __init
scx200_init(void)
113 pr_info("NatSemi SCx200 Driver\n");
114 return pci_register_driver(&scx200_pci_driver
);
117 static void __exit
scx200_cleanup(void)
119 pci_unregister_driver(&scx200_pci_driver
);
120 release_region(scx200_gpio_base
, SCx200_GPIO_SIZE
);
123 module_init(scx200_init
);
124 module_exit(scx200_cleanup
);
126 EXPORT_SYMBOL(scx200_gpio_base
);
127 EXPORT_SYMBOL(scx200_gpio_shadow
);
128 EXPORT_SYMBOL(scx200_gpio_configure
);
129 EXPORT_SYMBOL(scx200_cb_base
);