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/drivers/i2c/busses/i2c-voodoo3.c

https://bitbucket.org/evzijst/gittest
C | 254 lines | 179 code | 37 blank | 38 comment | 12 complexity | b2e3c8c09eaf8b9fb23f6fed38081114 MD5 | raw file
  1/*
  2    voodoo3.c - Part of lm_sensors, Linux kernel modules for hardware
  3              monitoring
  4    Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl>,
  5    Philip Edelbrock <phil@netroedge.com>,
  6    Ralph Metzler <rjkm@thp.uni-koeln.de>, and
  7    Mark D. Studebaker <mdsxyz123@yahoo.com>
  8    
  9    Based on code written by Ralph Metzler <rjkm@thp.uni-koeln.de> and
 10    Simon Vogl
 11
 12    This program is free software; you can redistribute it and/or modify
 13    it under the terms of the GNU General Public License as published by
 14    the Free Software Foundation; either version 2 of the License, or
 15    (at your option) any later version.
 16
 17    This program is distributed in the hope that it will be useful,
 18    but WITHOUT ANY WARRANTY; without even the implied warranty of
 19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 20    GNU General Public License for more details.
 21
 22    You should have received a copy of the GNU General Public License
 23    along with this program; if not, write to the Free Software
 24    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 25*/
 26
 27/* This interfaces to the I2C bus of the Voodoo3 to gain access to
 28    the BT869 and possibly other I2C devices. */
 29
 30#include <linux/config.h>
 31#include <linux/kernel.h>
 32#include <linux/module.h>
 33#include <linux/init.h>
 34#include <linux/pci.h>
 35#include <linux/i2c.h>
 36#include <linux/i2c-algo-bit.h>
 37#include <asm/io.h>
 38
 39/* the only registers we use */
 40#define REG		0x78
 41#define REG2 		0x70
 42
 43/* bit locations in the register */
 44#define DDC_ENAB	0x00040000
 45#define DDC_SCL_OUT	0x00080000
 46#define DDC_SDA_OUT	0x00100000
 47#define DDC_SCL_IN	0x00200000
 48#define DDC_SDA_IN	0x00400000
 49#define I2C_ENAB	0x00800000
 50#define I2C_SCL_OUT	0x01000000
 51#define I2C_SDA_OUT	0x02000000
 52#define I2C_SCL_IN	0x04000000
 53#define I2C_SDA_IN	0x08000000
 54
 55/* initialization states */
 56#define INIT2		0x2
 57#define INIT3		0x4
 58
 59/* delays */
 60#define CYCLE_DELAY	10
 61#define TIMEOUT		(HZ / 2)
 62
 63
 64static void __iomem *ioaddr;
 65
 66/* The voo GPIO registers don't have individual masks for each bit
 67   so we always have to read before writing. */
 68
 69static void bit_vooi2c_setscl(void *data, int val)
 70{
 71	unsigned int r;
 72	r = readl(ioaddr + REG);
 73	if (val)
 74		r |= I2C_SCL_OUT;
 75	else
 76		r &= ~I2C_SCL_OUT;
 77	writel(r, ioaddr + REG);
 78	readl(ioaddr + REG);	/* flush posted write */
 79}
 80
 81static void bit_vooi2c_setsda(void *data, int val)
 82{
 83	unsigned int r;
 84	r = readl(ioaddr + REG);
 85	if (val)
 86		r |= I2C_SDA_OUT;
 87	else
 88		r &= ~I2C_SDA_OUT;
 89	writel(r, ioaddr + REG);
 90	readl(ioaddr + REG);	/* flush posted write */
 91}
 92
 93/* The GPIO pins are open drain, so the pins always remain outputs.
 94   We rely on the i2c-algo-bit routines to set the pins high before
 95   reading the input from other chips. */
 96
 97static int bit_vooi2c_getscl(void *data)
 98{
 99	return (0 != (readl(ioaddr + REG) & I2C_SCL_IN));
100}
101
102static int bit_vooi2c_getsda(void *data)
103{
104	return (0 != (readl(ioaddr + REG) & I2C_SDA_IN));
105}
106
107static void bit_vooddc_setscl(void *data, int val)
108{
109	unsigned int r;
110	r = readl(ioaddr + REG);
111	if (val)
112		r |= DDC_SCL_OUT;
113	else
114		r &= ~DDC_SCL_OUT;
115	writel(r, ioaddr + REG);
116	readl(ioaddr + REG);	/* flush posted write */
117}
118
119static void bit_vooddc_setsda(void *data, int val)
120{
121	unsigned int r;
122	r = readl(ioaddr + REG);
123	if (val)
124		r |= DDC_SDA_OUT;
125	else
126		r &= ~DDC_SDA_OUT;
127	writel(r, ioaddr + REG);
128	readl(ioaddr + REG);	/* flush posted write */
129}
130
131static int bit_vooddc_getscl(void *data)
132{
133	return (0 != (readl(ioaddr + REG) & DDC_SCL_IN));
134}
135
136static int bit_vooddc_getsda(void *data)
137{
138	return (0 != (readl(ioaddr + REG) & DDC_SDA_IN));
139}
140
141static int config_v3(struct pci_dev *dev)
142{
143	unsigned long cadr;
144
145	/* map Voodoo3 memory */
146	cadr = dev->resource[0].start;
147	cadr &= PCI_BASE_ADDRESS_MEM_MASK;
148	ioaddr = ioremap_nocache(cadr, 0x1000);
149	if (ioaddr) {
150		writel(0x8160, ioaddr + REG2);
151		writel(0xcffc0020, ioaddr + REG);
152		dev_info(&dev->dev, "Using Banshee/Voodoo3 I2C device at %p\n", ioaddr);
153		return 0;
154	}
155	return -ENODEV;
156}
157
158static struct i2c_algo_bit_data voo_i2c_bit_data = {
159	.setsda		= bit_vooi2c_setsda,
160	.setscl		= bit_vooi2c_setscl,
161	.getsda		= bit_vooi2c_getsda,
162	.getscl		= bit_vooi2c_getscl,
163	.udelay		= CYCLE_DELAY,
164	.mdelay		= CYCLE_DELAY,
165	.timeout	= TIMEOUT
166};
167
168static struct i2c_adapter voodoo3_i2c_adapter = {
169	.owner		= THIS_MODULE,
170	.class		= I2C_CLASS_TV_ANALOG, 
171	.name		= "I2C Voodoo3/Banshee adapter",
172	.algo_data	= &voo_i2c_bit_data,
173};
174
175static struct i2c_algo_bit_data voo_ddc_bit_data = {
176	.setsda		= bit_vooddc_setsda,
177	.setscl		= bit_vooddc_setscl,
178	.getsda		= bit_vooddc_getsda,
179	.getscl		= bit_vooddc_getscl,
180	.udelay		= CYCLE_DELAY,
181	.mdelay		= CYCLE_DELAY,
182	.timeout	= TIMEOUT
183};
184
185static struct i2c_adapter voodoo3_ddc_adapter = {
186	.owner		= THIS_MODULE,
187	.class		= I2C_CLASS_DDC, 
188	.name		= "DDC Voodoo3/Banshee adapter",
189	.algo_data	= &voo_ddc_bit_data,
190};
191
192static struct pci_device_id voodoo3_ids[] __devinitdata = {
193	{ PCI_DEVICE(PCI_VENDOR_ID_3DFX, PCI_DEVICE_ID_3DFX_VOODOO3) },
194	{ PCI_DEVICE(PCI_VENDOR_ID_3DFX, PCI_DEVICE_ID_3DFX_BANSHEE) },
195	{ 0, }
196};
197
198MODULE_DEVICE_TABLE (pci, voodoo3_ids);
199
200static int __devinit voodoo3_probe(struct pci_dev *dev, const struct pci_device_id *id)
201{
202	int retval;
203
204	retval = config_v3(dev);
205	if (retval)
206		return retval;
207
208	/* set up the sysfs linkage to our parent device */
209	voodoo3_i2c_adapter.dev.parent = &dev->dev;
210	voodoo3_ddc_adapter.dev.parent = &dev->dev;
211
212	retval = i2c_bit_add_bus(&voodoo3_i2c_adapter);
213	if (retval)
214		return retval;
215	retval = i2c_bit_add_bus(&voodoo3_ddc_adapter);
216	if (retval)
217		i2c_bit_del_bus(&voodoo3_i2c_adapter);
218	return retval;
219}
220
221static void __devexit voodoo3_remove(struct pci_dev *dev)
222{
223	i2c_bit_del_bus(&voodoo3_i2c_adapter);
224 	i2c_bit_del_bus(&voodoo3_ddc_adapter);
225	iounmap(ioaddr);
226}
227
228static struct pci_driver voodoo3_driver = {
229	.name		= "voodoo3_smbus",
230	.id_table	= voodoo3_ids,
231	.probe		= voodoo3_probe,
232	.remove		= __devexit_p(voodoo3_remove),
233};
234
235static int __init i2c_voodoo3_init(void)
236{
237	return pci_register_driver(&voodoo3_driver);
238}
239
240static void __exit i2c_voodoo3_exit(void)
241{
242	pci_unregister_driver(&voodoo3_driver);
243}
244
245
246MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
247		"Philip Edelbrock <phil@netroedge.com>, "
248		"Ralph Metzler <rjkm@thp.uni-koeln.de>, "
249		"and Mark D. Studebaker <mdsxyz123@yahoo.com>");
250MODULE_DESCRIPTION("Voodoo3 I2C/SMBus driver");
251MODULE_LICENSE("GPL");
252
253module_init(i2c_voodoo3_init);
254module_exit(i2c_voodoo3_exit);