[deliverable/linux.git] / arch / i386 / kernel / scx200.c

/* linux/arch/i386/kernel/scx200.c 

   Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>

   National Semiconductor SCx200 support. */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pci.h>

#include <linux/scx200.h>
#include <linux/scx200_gpio.h>

/* Verify that the configuration block really is there */
#define scx200_cb_probe(base) (inw((base) + SCx200_CBA) == (base))

#define NAME "scx200"

MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>");
MODULE_DESCRIPTION("NatSemi SCx200 Driver");
MODULE_LICENSE("GPL");

unsigned scx200_gpio_base = 0;
long scx200_gpio_shadow[2];

unsigned scx200_cb_base = 0;

static struct pci_device_id scx200_tbl[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE) },
	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE) },
	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_XBUS)   },
	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_XBUS)   },
	{ },
};
MODULE_DEVICE_TABLE(pci,scx200_tbl);

static int __devinit scx200_probe(struct pci_dev *, const struct pci_device_id *);

static struct pci_driver scx200_pci_driver = {
	.name = "scx200",
	.id_table = scx200_tbl,
	.probe = scx200_probe,
};

static DEFINE_SPINLOCK(scx200_gpio_config_lock);

static int __devinit scx200_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	int bank;
	unsigned base;

	if (pdev->device == PCI_DEVICE_ID_NS_SCx200_BRIDGE ||
	    pdev->device == PCI_DEVICE_ID_NS_SC1100_BRIDGE) {
		base = pci_resource_start(pdev, 0);
		printk(KERN_INFO NAME ": GPIO base 0x%x\n", base);

		if (request_region(base, SCx200_GPIO_SIZE, "NatSemi SCx200 GPIO") == 0) {
			printk(KERN_ERR NAME ": can't allocate I/O for GPIOs\n");
			return -EBUSY;
		}

		scx200_gpio_base = base;

		/* read the current values driven on the GPIO signals */
		for (bank = 0; bank < 2; ++bank)
			scx200_gpio_shadow[bank] = inl(scx200_gpio_base + 0x10 * bank);

	} else {
		/* find the base of the Configuration Block */
		if (scx200_cb_probe(SCx200_CB_BASE_FIXED)) {
			scx200_cb_base = SCx200_CB_BASE_FIXED;
		} else {
			pci_read_config_dword(pdev, SCx200_CBA_SCRATCH, &base);
			if (scx200_cb_probe(base)) {
				scx200_cb_base = base;
			} else {
				printk(KERN_WARNING NAME ": Configuration Block not found\n");
				return -ENODEV;
			}
		}
		printk(KERN_INFO NAME ": Configuration Block base 0x%x\n", scx200_cb_base);
	}

	return 0;
}

u32 scx200_gpio_configure(int index, u32 mask, u32 bits)
{
	u32 config, new_config;
	unsigned long flags;

	spin_lock_irqsave(&scx200_gpio_config_lock, flags);

	outl(index, scx200_gpio_base + 0x20);
	config = inl(scx200_gpio_base + 0x24);

	new_config = (config & mask) | bits;
	outl(new_config, scx200_gpio_base + 0x24);

	spin_unlock_irqrestore(&scx200_gpio_config_lock, flags);

	return config;
}

#if 0
void scx200_gpio_dump(unsigned index)
{
	u32 config = scx200_gpio_configure(index, ~0, 0);
	printk(KERN_DEBUG "GPIO%02u: 0x%08lx", index, (unsigned long)config);
	
	if (config & 1) 
		printk(" OE"); /* output enabled */
	else
		printk(" TS"); /* tristate */
	if (config & 2) 
		printk(" PP"); /* push pull */
	else
		printk(" OD"); /* open drain */
	if (config & 4) 
		printk(" PUE"); /* pull up enabled */
	else
		printk(" PUD"); /* pull up disabled */
	if (config & 8) 
		printk(" LOCKED"); /* locked */
	if (config & 16) 
		printk(" LEVEL"); /* level input */
	else
		printk(" EDGE"); /* edge input */
	if (config & 32) 
		printk(" HI"); /* trigger on rising edge */
	else
		printk(" LO"); /* trigger on falling edge */
	if (config & 64) 
		printk(" DEBOUNCE"); /* debounce */
	printk("\n");
}
#endif  /*  0  */

static int __init scx200_init(void)
{
	printk(KERN_INFO NAME ": NatSemi SCx200 Driver\n");

	return pci_module_init(&scx200_pci_driver);
}

static void __exit scx200_cleanup(void)
{
	pci_unregister_driver(&scx200_pci_driver);
	release_region(scx200_gpio_base, SCx200_GPIO_SIZE);
}

module_init(scx200_init);
module_exit(scx200_cleanup);

EXPORT_SYMBOL(scx200_gpio_base);
EXPORT_SYMBOL(scx200_gpio_shadow);
EXPORT_SYMBOL(scx200_gpio_configure);
EXPORT_SYMBOL(scx200_cb_base);

/*
    Local variables:
        compile-command: "make -k -C ../../.. SUBDIRS=arch/i386/kernel modules"
        c-basic-offset: 8
    End:
*/
Commit	Line	Data
1da177e4 LT	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>
cc658cfe	15	#include <linux/scx200_gpio.h>
1da177e4 LT	16
	17	/* Verify that the configuration block really is there */
	18	#define scx200_cb_probe(base) (inw((base) + SCx200_CBA) == (base))
	19
	20	#define NAME "scx200"
	21
	22	MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>");
	23	MODULE_DESCRIPTION("NatSemi SCx200 Driver");
	24	MODULE_LICENSE("GPL");
	25
	26	unsigned scx200_gpio_base = 0;
	27	long scx200_gpio_shadow[2];
	28
	29	unsigned scx200_cb_base = 0;
	30
	31	static struct pci_device_id scx200_tbl[] = {
	32	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE) },
	33	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE) },
	34	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_XBUS) },
	35	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_XBUS) },
	36	{ },
	37	};
	38	MODULE_DEVICE_TABLE(pci,scx200_tbl);
	39
	40	static int __devinit scx200_probe(struct pci_dev , const struct pci_device_id );
	41
	42	static struct pci_driver scx200_pci_driver = {
	43	.name = "scx200",
	44	.id_table = scx200_tbl,
	45	.probe = scx200_probe,
	46	};
	47
	48	static DEFINE_SPINLOCK(scx200_gpio_config_lock);
	49
	50	static int __devinit scx200_probe(struct pci_dev pdev, const struct pci_device_id ent)
	51	{
	52	int bank;
	53	unsigned base;
	54
	55	if (pdev->device == PCI_DEVICE_ID_NS_SCx200_BRIDGE \|\|
	56	pdev->device == PCI_DEVICE_ID_NS_SC1100_BRIDGE) {
	57	base = pci_resource_start(pdev, 0);
	58	printk(KERN_INFO NAME ": GPIO base 0x%x\n", base);
	59
	60	if (request_region(base, SCx200_GPIO_SIZE, "NatSemi SCx200 GPIO") == 0) {
	61	printk(KERN_ERR NAME ": can't allocate I/O for GPIOs\n");
	62	return -EBUSY;
	63	}
	64
	65	scx200_gpio_base = base;
	66
	67	/* read the current values driven on the GPIO signals */
	68	for (bank = 0; bank < 2; ++bank)
	69	scx200_gpio_shadow[bank] = inl(scx200_gpio_base + 0x10 * bank);
	70
	71	} else {
	72	/* find the base of the Configuration Block */
	73	if (scx200_cb_probe(SCx200_CB_BASE_FIXED)) {
	74	scx200_cb_base = SCx200_CB_BASE_FIXED;
	75	} else {
	76	pci_read_config_dword(pdev, SCx200_CBA_SCRATCH, &base);
	77	if (scx200_cb_probe(base)) {
	78	scx200_cb_base = base;
	79	} else {
80	printk(KERN_WARNING NAME ": Configuration Block not found\n");
81	return -ENODEV;
82	}
83	}
84	printk(KERN_INFO NAME ": Configuration Block base 0x%x\n", scx200_cb_base);
85	}
86
87	return 0;
88	}
89
90	u32 scx200_gpio_configure(int index, u32 mask, u32 bits)
91	{
92	u32 config, new_config;
93	unsigned long flags;
94
95	spin_lock_irqsave(&scx200_gpio_config_lock, flags);
96
97	outl(index, scx200_gpio_base + 0x20);
98	config = inl(scx200_gpio_base + 0x24);
99
100	new_config = (config & mask) \| bits;
101	outl(new_config, scx200_gpio_base + 0x24);
102
103	spin_unlock_irqrestore(&scx200_gpio_config_lock, flags);
104
105	return config;
106	}
107
108	#if 0
109	void scx200_gpio_dump(unsigned index)
110	{
111	u32 config = scx200_gpio_configure(index, ~0, 0);
112	printk(KERN_DEBUG "GPIO%02u: 0x%08lx", index, (unsigned long)config);
113
114	if (config & 1)
115	printk(" OE"); /* output enabled */
116	else
117	printk(" TS"); /* tristate */
118	if (config & 2)
119	printk(" PP"); /* push pull */
120	else
121	printk(" OD"); /* open drain */
122	if (config & 4)
123	printk(" PUE"); /* pull up enabled */
124	else
125	printk(" PUD"); /* pull up disabled */
126	if (config & 8)
127	printk(" LOCKED"); /* locked */
128	if (config & 16)
129	printk(" LEVEL"); /* level input */
130	else
131	printk(" EDGE"); /* edge input */
132	if (config & 32)
133	printk(" HI"); /* trigger on rising edge */
134	else
135	printk(" LO"); /* trigger on falling edge */
136	if (config & 64)
137	printk(" DEBOUNCE"); /* debounce */
138	printk("\n");
139	}
140	#endif /* 0 */
141
142	static int __init scx200_init(void)
143	{
144	printk(KERN_INFO NAME ": NatSemi SCx200 Driver\n");
145
146	return pci_module_init(&scx200_pci_driver);
147	}
148
149	static void __exit scx200_cleanup(void)
150	{
151	pci_unregister_driver(&scx200_pci_driver);
152	release_region(scx200_gpio_base, SCx200_GPIO_SIZE);
153	}
154
155	module_init(scx200_init);
156	module_exit(scx200_cleanup);
157
158	EXPORT_SYMBOL(scx200_gpio_base);
159	EXPORT_SYMBOL(scx200_gpio_shadow);
160	EXPORT_SYMBOL(scx200_gpio_configure);
161	EXPORT_SYMBOL(scx200_cb_base);
162
163	/*
164	Local variables:
165	compile-command: "make -k -C ../../.. SUBDIRS=arch/i386/kernel modules"
166	c-basic-offset: 8
167	End:
168	*/