[deliverable/linux.git] / drivers / i2c / busses / i2c-voodoo3.c

/*
    Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl>,
    Philip Edelbrock <phil@netroedge.com>,
    Ralph Metzler <rjkm@thp.uni-koeln.de>, and
    Mark D. Studebaker <mdsxyz123@yahoo.com>
    
    Based on code written by Ralph Metzler <rjkm@thp.uni-koeln.de> and
    Simon Vogl

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/* This interfaces to the I2C bus of the Voodoo3 to gain access to
    the BT869 and possibly other I2C devices. */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <asm/io.h>

/* the only registers we use */
#define REG		0x78
#define REG2 		0x70

/* bit locations in the register */
#define DDC_ENAB	0x00040000
#define DDC_SCL_OUT	0x00080000
#define DDC_SDA_OUT	0x00100000
#define DDC_SCL_IN	0x00200000
#define DDC_SDA_IN	0x00400000
#define I2C_ENAB	0x00800000
#define I2C_SCL_OUT	0x01000000
#define I2C_SDA_OUT	0x02000000
#define I2C_SCL_IN	0x04000000
#define I2C_SDA_IN	0x08000000

/* initialization states */
#define INIT2		0x2
#define INIT3		0x4

/* delays */
#define CYCLE_DELAY	10
#define TIMEOUT		(HZ / 2)


static void __iomem *ioaddr;

/* The voo GPIO registers don't have individual masks for each bit
   so we always have to read before writing. */

static void bit_vooi2c_setscl(void *data, int val)
{
	unsigned int r;
	r = readl(ioaddr + REG);
	if (val)
		r |= I2C_SCL_OUT;
	else
		r &= ~I2C_SCL_OUT;
	writel(r, ioaddr + REG);
	readl(ioaddr + REG);	/* flush posted write */
}

static void bit_vooi2c_setsda(void *data, int val)
{
	unsigned int r;
	r = readl(ioaddr + REG);
	if (val)
		r |= I2C_SDA_OUT;
	else
		r &= ~I2C_SDA_OUT;
	writel(r, ioaddr + REG);
	readl(ioaddr + REG);	/* flush posted write */
}

/* The GPIO pins are open drain, so the pins always remain outputs.
   We rely on the i2c-algo-bit routines to set the pins high before
   reading the input from other chips. */

static int bit_vooi2c_getscl(void *data)
{
	return (0 != (readl(ioaddr + REG) & I2C_SCL_IN));
}

static int bit_vooi2c_getsda(void *data)
{
	return (0 != (readl(ioaddr + REG) & I2C_SDA_IN));
}

static void bit_vooddc_setscl(void *data, int val)
{
	unsigned int r;
	r = readl(ioaddr + REG);
	if (val)
		r |= DDC_SCL_OUT;
	else
		r &= ~DDC_SCL_OUT;
	writel(r, ioaddr + REG);
	readl(ioaddr + REG);	/* flush posted write */
}

static void bit_vooddc_setsda(void *data, int val)
{
	unsigned int r;
	r = readl(ioaddr + REG);
	if (val)
		r |= DDC_SDA_OUT;
	else
		r &= ~DDC_SDA_OUT;
	writel(r, ioaddr + REG);
	readl(ioaddr + REG);	/* flush posted write */
}

static int bit_vooddc_getscl(void *data)
{
	return (0 != (readl(ioaddr + REG) & DDC_SCL_IN));
}

static int bit_vooddc_getsda(void *data)
{
	return (0 != (readl(ioaddr + REG) & DDC_SDA_IN));
}

static int config_v3(struct pci_dev *dev)
{
	unsigned long cadr;

	/* map Voodoo3 memory */
	cadr = dev->resource[0].start;
	cadr &= PCI_BASE_ADDRESS_MEM_MASK;
	ioaddr = ioremap_nocache(cadr, 0x1000);
	if (ioaddr) {
		writel(0x8160, ioaddr + REG2);
		writel(0xcffc0020, ioaddr + REG);
		dev_info(&dev->dev, "Using Banshee/Voodoo3 I2C device at %p\n", ioaddr);
		return 0;
	}
	return -ENODEV;
}

static struct i2c_algo_bit_data voo_i2c_bit_data = {
	.setsda		= bit_vooi2c_setsda,
	.setscl		= bit_vooi2c_setscl,
	.getsda		= bit_vooi2c_getsda,
	.getscl		= bit_vooi2c_getscl,
	.udelay		= CYCLE_DELAY,
	.timeout	= TIMEOUT
};

static struct i2c_adapter voodoo3_i2c_adapter = {
	.owner		= THIS_MODULE,
	.id		= I2C_HW_B_VOO,
	.class		= I2C_CLASS_TV_ANALOG, 
	.name		= "I2C Voodoo3/Banshee adapter",
	.algo_data	= &voo_i2c_bit_data,
};

static struct i2c_algo_bit_data voo_ddc_bit_data = {
	.setsda		= bit_vooddc_setsda,
	.setscl		= bit_vooddc_setscl,
	.getsda		= bit_vooddc_getsda,
	.getscl		= bit_vooddc_getscl,
	.udelay		= CYCLE_DELAY,
	.timeout	= TIMEOUT
};

static struct i2c_adapter voodoo3_ddc_adapter = {
	.owner		= THIS_MODULE,
	.id		= I2C_HW_B_VOO,
	.class		= I2C_CLASS_DDC, 
	.name		= "DDC Voodoo3/Banshee adapter",
	.algo_data	= &voo_ddc_bit_data,
};

static struct pci_device_id voodoo3_ids[] __devinitdata = {
	{ PCI_DEVICE(PCI_VENDOR_ID_3DFX, PCI_DEVICE_ID_3DFX_VOODOO3) },
	{ PCI_DEVICE(PCI_VENDOR_ID_3DFX, PCI_DEVICE_ID_3DFX_BANSHEE) },
	{ 0, }
};

MODULE_DEVICE_TABLE (pci, voodoo3_ids);

static int __devinit voodoo3_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
	int retval;

	retval = config_v3(dev);
	if (retval)
		return retval;

	/* set up the sysfs linkage to our parent device */
	voodoo3_i2c_adapter.dev.parent = &dev->dev;
	voodoo3_ddc_adapter.dev.parent = &dev->dev;

	retval = i2c_bit_add_bus(&voodoo3_i2c_adapter);
	if (retval)
		return retval;
	retval = i2c_bit_add_bus(&voodoo3_ddc_adapter);
	if (retval)
		i2c_del_adapter(&voodoo3_i2c_adapter);
	return retval;
}

static void __devexit voodoo3_remove(struct pci_dev *dev)
{
	i2c_del_adapter(&voodoo3_i2c_adapter);
	i2c_del_adapter(&voodoo3_ddc_adapter);
	iounmap(ioaddr);
}

static struct pci_driver voodoo3_driver = {
	.name		= "voodoo3_smbus",
	.id_table	= voodoo3_ids,
	.probe		= voodoo3_probe,
	.remove		= __devexit_p(voodoo3_remove),
};

static int __init i2c_voodoo3_init(void)
{
	return pci_register_driver(&voodoo3_driver);
}

static void __exit i2c_voodoo3_exit(void)
{
	pci_unregister_driver(&voodoo3_driver);
}


MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
		"Philip Edelbrock <phil@netroedge.com>, "
		"Ralph Metzler <rjkm@thp.uni-koeln.de>, "
		"and Mark D. Studebaker <mdsxyz123@yahoo.com>");
MODULE_DESCRIPTION("Voodoo3 I2C/SMBus driver");
MODULE_LICENSE("GPL");

module_init(i2c_voodoo3_init);
module_exit(i2c_voodoo3_exit);
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl>,
	3	Philip Edelbrock <phil@netroedge.com>,
	4	Ralph Metzler <rjkm@thp.uni-koeln.de>, and
	5	Mark D. Studebaker <mdsxyz123@yahoo.com>
	6
	7	Based on code written by Ralph Metzler <rjkm@thp.uni-koeln.de> and
	8	Simon Vogl
	9
	10	This program is free software; you can redistribute it and/or modify
	11	it under the terms of the GNU General Public License as published by
	12	the Free Software Foundation; either version 2 of the License, or
	13	(at your option) any later version.
	14
	15	This program is distributed in the hope that it will be useful,
	16	but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	GNU General Public License for more details.
	19
	20	You should have received a copy of the GNU General Public License
	21	along with this program; if not, write to the Free Software
	22	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	23	*/
	24
	25	/* This interfaces to the I2C bus of the Voodoo3 to gain access to
	26	the BT869 and possibly other I2C devices. */
	27
1da177e4 LT	28	#include <linux/kernel.h>
	29	#include <linux/module.h>
	30	#include <linux/init.h>
	31	#include <linux/pci.h>
	32	#include <linux/i2c.h>
	33	#include <linux/i2c-algo-bit.h>
	34	#include <asm/io.h>
	35
	36	/* the only registers we use */
	37	#define REG 0x78
	38	#define REG2 0x70
	39
	40	/* bit locations in the register */
	41	#define DDC_ENAB 0x00040000
	42	#define DDC_SCL_OUT 0x00080000
	43	#define DDC_SDA_OUT 0x00100000
	44	#define DDC_SCL_IN 0x00200000
	45	#define DDC_SDA_IN 0x00400000
	46	#define I2C_ENAB 0x00800000
	47	#define I2C_SCL_OUT 0x01000000
	48	#define I2C_SDA_OUT 0x02000000
	49	#define I2C_SCL_IN 0x04000000
	50	#define I2C_SDA_IN 0x08000000
	51
	52	/* initialization states */
	53	#define INIT2 0x2
	54	#define INIT3 0x4
	55
	56	/* delays */
	57	#define CYCLE_DELAY 10
	58	#define TIMEOUT (HZ / 2)
	59
	60
	61	static void __iomem *ioaddr;
	62
	63	/* The voo GPIO registers don't have individual masks for each bit
	64	so we always have to read before writing. */
	65
	66	static void bit_vooi2c_setscl(void *data, int val)
	67	{
	68	unsigned int r;
	69	r = readl(ioaddr + REG);
	70	if (val)
	71	r \|= I2C_SCL_OUT;
	72	else
	73	r &= ~I2C_SCL_OUT;
	74	writel(r, ioaddr + REG);
	75	readl(ioaddr + REG); /* flush posted write */
	76	}
	77
	78	static void bit_vooi2c_setsda(void *data, int val)
	79	{
	80	unsigned int r;
	81	r = readl(ioaddr + REG);
	82	if (val)
	83	r \|= I2C_SDA_OUT;
	84	else
	85	r &= ~I2C_SDA_OUT;
	86	writel(r, ioaddr + REG);
	87	readl(ioaddr + REG); /* flush posted write */
	88	}
	89
	90	/* The GPIO pins are open drain, so the pins always remain outputs.
	91	We rely on the i2c-algo-bit routines to set the pins high before
92	reading the input from other chips. */
93
94	static int bit_vooi2c_getscl(void *data)
95	{
96	return (0 != (readl(ioaddr + REG) & I2C_SCL_IN));
97	}
98
99	static int bit_vooi2c_getsda(void *data)
100	{
101	return (0 != (readl(ioaddr + REG) & I2C_SDA_IN));
102	}
103
104	static void bit_vooddc_setscl(void *data, int val)
105	{
106	unsigned int r;
107	r = readl(ioaddr + REG);
108	if (val)
109	r \|= DDC_SCL_OUT;
110	else
111	r &= ~DDC_SCL_OUT;
112	writel(r, ioaddr + REG);
113	readl(ioaddr + REG); /* flush posted write */
114	}
115
116	static void bit_vooddc_setsda(void *data, int val)
117	{
118	unsigned int r;
119	r = readl(ioaddr + REG);
120	if (val)
121	r \|= DDC_SDA_OUT;
122	else
123	r &= ~DDC_SDA_OUT;
124	writel(r, ioaddr + REG);
125	readl(ioaddr + REG); /* flush posted write */
126	}
127
128	static int bit_vooddc_getscl(void *data)
129	{
130	return (0 != (readl(ioaddr + REG) & DDC_SCL_IN));
131	}
132
133	static int bit_vooddc_getsda(void *data)
134	{
135	return (0 != (readl(ioaddr + REG) & DDC_SDA_IN));
136	}
137
138	static int config_v3(struct pci_dev *dev)
139	{
140	unsigned long cadr;
141
142	/* map Voodoo3 memory */
143	cadr = dev->resource[0].start;
144	cadr &= PCI_BASE_ADDRESS_MEM_MASK;
145	ioaddr = ioremap_nocache(cadr, 0x1000);
146	if (ioaddr) {
147	writel(0x8160, ioaddr + REG2);
148	writel(0xcffc0020, ioaddr + REG);
149	dev_info(&dev->dev, "Using Banshee/Voodoo3 I2C device at %p\n", ioaddr);
150	return 0;
151	}
152	return -ENODEV;
153	}
154
155	static struct i2c_algo_bit_data voo_i2c_bit_data = {
156	.setsda = bit_vooi2c_setsda,
157	.setscl = bit_vooi2c_setscl,
158	.getsda = bit_vooi2c_getsda,
159	.getscl = bit_vooi2c_getscl,
160	.udelay = CYCLE_DELAY,
1da177e4 LT	161	.timeout = TIMEOUT
	162	};
	163
	164	static struct i2c_adapter voodoo3_i2c_adapter = {
	165	.owner = THIS_MODULE,
9ace555d	166	.id = I2C_HW_B_VOO,
1da177e4 LT	167	.class = I2C_CLASS_TV_ANALOG,
	168	.name = "I2C Voodoo3/Banshee adapter",
	169	.algo_data = &voo_i2c_bit_data,
	170	};
	171
	172	static struct i2c_algo_bit_data voo_ddc_bit_data = {
	173	.setsda = bit_vooddc_setsda,
	174	.setscl = bit_vooddc_setscl,
	175	.getsda = bit_vooddc_getsda,
	176	.getscl = bit_vooddc_getscl,
	177	.udelay = CYCLE_DELAY,
1da177e4 LT	178	.timeout = TIMEOUT
	179	};
	180
	181	static struct i2c_adapter voodoo3_ddc_adapter = {
	182	.owner = THIS_MODULE,
9ace555d	183	.id = I2C_HW_B_VOO,
1da177e4 LT	184	.class = I2C_CLASS_DDC,
	185	.name = "DDC Voodoo3/Banshee adapter",
	186	.algo_data = &voo_ddc_bit_data,
	187	};
	188
	189	static struct pci_device_id voodoo3_ids[] __devinitdata = {
	190	{ PCI_DEVICE(PCI_VENDOR_ID_3DFX, PCI_DEVICE_ID_3DFX_VOODOO3) },
	191	{ PCI_DEVICE(PCI_VENDOR_ID_3DFX, PCI_DEVICE_ID_3DFX_BANSHEE) },
	192	{ 0, }
	193	};
	194
	195	MODULE_DEVICE_TABLE (pci, voodoo3_ids);
	196
	197	static int __devinit voodoo3_probe(struct pci_dev dev, const struct pci_device_id id)
	198	{
	199	int retval;
	200
	201	retval = config_v3(dev);
	202	if (retval)
	203	return retval;
	204
	205	/* set up the sysfs linkage to our parent device */
	206	voodoo3_i2c_adapter.dev.parent = &dev->dev;
	207	voodoo3_ddc_adapter.dev.parent = &dev->dev;
	208
	209	retval = i2c_bit_add_bus(&voodoo3_i2c_adapter);
	210	if (retval)
	211	return retval;
	212	retval = i2c_bit_add_bus(&voodoo3_ddc_adapter);
	213	if (retval)
3269711b	214	i2c_del_adapter(&voodoo3_i2c_adapter);
1da177e4 LT	215	return retval;
	216	}
	217
	218	static void __devexit voodoo3_remove(struct pci_dev *dev)
	219	{
3269711b JD	220	i2c_del_adapter(&voodoo3_i2c_adapter);
3269711b JD	221	i2c_del_adapter(&voodoo3_ddc_adapter);
1da177e4 LT	222	iounmap(ioaddr);
	223	}
	224
	225	static struct pci_driver voodoo3_driver = {
	226	.name = "voodoo3_smbus",
	227	.id_table = voodoo3_ids,
	228	.probe = voodoo3_probe,
	229	.remove = __devexit_p(voodoo3_remove),
	230	};
	231
	232	static int __init i2c_voodoo3_init(void)
	233	{
	234	return pci_register_driver(&voodoo3_driver);
	235	}
	236
	237	static void __exit i2c_voodoo3_exit(void)
	238	{
	239	pci_unregister_driver(&voodoo3_driver);
	240	}
	241
	242
	243	MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
	244	"Philip Edelbrock <phil@netroedge.com>, "
	245	"Ralph Metzler <rjkm@thp.uni-koeln.de>, "
	246	"and Mark D. Studebaker <mdsxyz123@yahoo.com>");
	247	MODULE_DESCRIPTION("Voodoo3 I2C/SMBus driver");
	248	MODULE_LICENSE("GPL");
	249
	250	module_init(i2c_voodoo3_init);
	251	module_exit(i2c_voodoo3_exit);