1 files changed, 334 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-prosavage.c b/drivers/i2c/busses/i2c-prosavage.c
new file mode 100644
index 000000000000..13d66289933b
--- /dev/null
+++ b/drivers/i2c/busses/i2c-prosavage.c
@@ -0,0 +1,334 @@
+/*
+ *    kernel/busses/i2c-prosavage.c
+ *
+ *    i2c bus driver for S3/VIA 8365/8375 graphics processor.
+ *    Copyright (c) 2003 Henk Vergonet <henk@god.dyndns.org>
+ *    Based on code written by:
+ *	Frodo Looijaard <frodol@dds.nl>,
+ *	Philip Edelbrock <phil@netroedge.com>,
+ *	Ralph Metzler <rjkm@thp.uni-koeln.de>, and
+ *	Mark D. Studebaker <mdsxyz123@yahoo.com>
+ *	Simon Vogl
+ *	and others
+ *
+ *    Please read the lm_sensors documentation for details on use.
+ *
+ *    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.
+ *
+ */
+/*  18-05-2003 HVE - created
+ *  14-06-2003 HVE - adapted for lm_sensors2
+ *  17-06-2003 HVE - linux 2.5.xx compatible
+ *  18-06-2003 HVE - codingstyle
+ *  21-06-2003 HVE - compatibility lm_sensors2 and linux 2.5.xx
+ *		     codingstyle, mmio enabled
+ *
+ *  This driver interfaces to the I2C bus of the VIA north bridge embedded
+ *  ProSavage4/8 devices. Usefull for gaining access to the TV Encoder chips.
+ *
+ *  Graphics cores:
+ *   S3/VIA KM266/VT8375 aka ProSavage8
+ *   S3/VIA KM133/VT8365 aka Savage4
+ *
+ *  Two serial busses are implemented:
+ *   SERIAL1 - I2C serial communications interface
+ *   SERIAL2 - DDC2 monitor communications interface
+ *
+ *  Tested on a FX41 mainboard, see http://www.shuttle.com
+ * 
+ *
+ *  TODO:
+ *  - integration with prosavage framebuffer device
+ *    (Additional documentation needed :(
+ */
+
+#include <linux/config.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>
+
+/*
+ * driver configuration
+ */
+#define MAX_BUSSES	2
+
+struct s_i2c_bus {
+	void __iomem *mmvga;
+	int	i2c_reg;
+	int	adap_ok;
+	struct i2c_adapter		adap;
+	struct i2c_algo_bit_data	algo;
+};
+
+struct s_i2c_chip {
+	void __iomem *mmio;
+	struct s_i2c_bus	i2c_bus[MAX_BUSSES];
+};
+
+
+/*
+ * i2c configuration
+ */
+#ifndef I2C_HW_B_S3VIA
+#define I2C_HW_B_S3VIA	0x18	/* S3VIA ProSavage adapter		*/
+#endif
+
+/* delays */
+#define CYCLE_DELAY	10
+#define TIMEOUT		(HZ / 2)
+
+
+/* 
+ * S3/VIA 8365/8375 registers
+ */
+#define VGA_CR_IX	0x3d4
+#define VGA_CR_DATA	0x3d5
+
+#define CR_SERIAL1	0xa0	/* I2C serial communications interface */
+#define MM_SERIAL1	0xff20
+#define CR_SERIAL2	0xb1	/* DDC2 monitor communications interface */
+
+/* based on vt8365 documentation */
+#define I2C_ENAB	0x10
+#define I2C_SCL_OUT	0x01
+#define I2C_SDA_OUT	0x02
+#define I2C_SCL_IN	0x04
+#define I2C_SDA_IN	0x08
+
+#define SET_CR_IX(p, val)	writeb((val), (p)->mmvga + VGA_CR_IX)
+#define SET_CR_DATA(p, val)	writeb((val), (p)->mmvga + VGA_CR_DATA)
+#define GET_CR_DATA(p)		readb((p)->mmvga + VGA_CR_DATA)
+
+
+/*
+ * Serial bus line handling
+ *
+ * serial communications register as parameter in private data
+ *
+ * TODO: locks with other code sections accessing video registers?
+ */
+static void bit_s3via_setscl(void *bus, int val)
+{
+	struct s_i2c_bus *p = (struct s_i2c_bus *)bus;
+	unsigned int r;
+
+	SET_CR_IX(p, p->i2c_reg);
+	r = GET_CR_DATA(p);
+	r |= I2C_ENAB;
+	if (val) {
+		r |= I2C_SCL_OUT;
+	} else {
+		r &= ~I2C_SCL_OUT;
+	}
+	SET_CR_DATA(p, r);
+}
+
+static void bit_s3via_setsda(void *bus, int val)
+{
+	struct s_i2c_bus *p = (struct s_i2c_bus *)bus;
+	unsigned int r;
+	
+	SET_CR_IX(p, p->i2c_reg);
+	r = GET_CR_DATA(p);
+	r |= I2C_ENAB;
+	if (val) {
+		r |= I2C_SDA_OUT;
+	} else {
+		r &= ~I2C_SDA_OUT;
+	}
+	SET_CR_DATA(p, r);
+}
+
+static int bit_s3via_getscl(void *bus)
+{
+	struct s_i2c_bus *p = (struct s_i2c_bus *)bus;
+
+	SET_CR_IX(p, p->i2c_reg);
+	return (0 != (GET_CR_DATA(p) & I2C_SCL_IN));
+}
+
+static int bit_s3via_getsda(void *bus)
+{
+	struct s_i2c_bus *p = (struct s_i2c_bus *)bus;
+
+	SET_CR_IX(p, p->i2c_reg);
+	return (0 != (GET_CR_DATA(p) & I2C_SDA_IN));
+}
+
+
+/*
+ * adapter initialisation
+ */
+static int i2c_register_bus(struct pci_dev *dev, struct s_i2c_bus *p, void __iomem *mmvga, u32 i2c_reg)
+{
+	int ret;
+	p->adap.owner	  = THIS_MODULE;
+	p->adap.id	  = I2C_HW_B_S3VIA;
+	p->adap.algo_data = &p->algo;
+	p->adap.dev.parent = &dev->dev;
+	p->algo.setsda	  = bit_s3via_setsda;
+	p->algo.setscl	  = bit_s3via_setscl;
+	p->algo.getsda	  = bit_s3via_getsda;
+	p->algo.getscl	  = bit_s3via_getscl;
+	p->algo.udelay	  = CYCLE_DELAY;
+	p->algo.mdelay	  = CYCLE_DELAY;
+	p->algo.timeout	  = TIMEOUT;
+	p->algo.data	  = p;
+	p->mmvga	  = mmvga;
+	p->i2c_reg	  = i2c_reg;
+    
+	ret = i2c_bit_add_bus(&p->adap);
+	if (ret) {
+		return ret;
+	}
+
+	p->adap_ok = 1;
+	return 0;
+}
+
+
+/*
+ * Cleanup stuff
+ */
+static void prosavage_remove(struct pci_dev *dev)
+{
+	struct s_i2c_chip *chip;
+	int i, ret;
+
+	chip = (struct s_i2c_chip *)pci_get_drvdata(dev);
+
+	if (!chip) {
+		return;
+	}
+	for (i = MAX_BUSSES - 1; i >= 0; i--) {
+		if (chip->i2c_bus[i].adap_ok == 0)
+			continue;
+
+		ret = i2c_bit_del_bus(&chip->i2c_bus[i].adap);
+	        if (ret) {
+			dev_err(&dev->dev, "%s not removed\n",
+				chip->i2c_bus[i].adap.name);
+		}
+	}
+	if (chip->mmio) {
+		iounmap(chip->mmio);
+	}
+	kfree(chip);
+}
+
+
+/*
+ * Detect chip and initialize it
+ */
+static int __devinit prosavage_probe(struct pci_dev *dev, const struct pci_device_id *id)
+{
+	int ret;
+	unsigned long base, len;
+	struct s_i2c_chip *chip;
+	struct s_i2c_bus  *bus;
+
+        pci_set_drvdata(dev, kmalloc(sizeof(struct s_i2c_chip), GFP_KERNEL)); 
+	chip = (struct s_i2c_chip *)pci_get_drvdata(dev);
+	if (chip == NULL) {
+		return -ENOMEM;
+	}
+
+	memset(chip, 0, sizeof(struct s_i2c_chip));
+
+	base = dev->resource[0].start & PCI_BASE_ADDRESS_MEM_MASK;
+	len  = dev->resource[0].end - base + 1;
+	chip->mmio = ioremap_nocache(base, len);
+
+	if (chip->mmio == NULL) {
+		dev_err(&dev->dev, "ioremap failed\n");
+		prosavage_remove(dev);
+		return -ENODEV;
+	}
+
+
+	/*
+	 * Chip initialisation
+	 */
+	/* Unlock Extended IO Space ??? */
+
+
+	/*
+	 * i2c bus registration
+	 */
+	bus = &chip->i2c_bus[0];
+	snprintf(bus->adap.name, sizeof(bus->adap.name),
+		"ProSavage I2C bus at %02x:%02x.%x",
+		dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
+	ret = i2c_register_bus(dev, bus, chip->mmio + 0x8000, CR_SERIAL1);
+	if (ret) {
+		goto err_adap;
+	}
+	/*
+	 * ddc bus registration
+	 */
+	bus = &chip->i2c_bus[1];
+	snprintf(bus->adap.name, sizeof(bus->adap.name),
+		"ProSavage DDC bus at %02x:%02x.%x",
+		dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
+	ret = i2c_register_bus(dev, bus, chip->mmio + 0x8000, CR_SERIAL2);
+	if (ret) {
+		goto err_adap;
+	}
+	return 0;
+err_adap:
+	dev_err(&dev->dev, "%s failed\n", bus->adap.name);
+	prosavage_remove(dev);
+	return ret;
+}
+
+
+/*
+ * Data for PCI driver interface
+ */
+static struct pci_device_id prosavage_pci_tbl[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_S3, PCI_DEVICE_ID_S3_SAVAGE4) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_S3, PCI_DEVICE_ID_S3_PROSAVAGE8) },
+	{ 0, },
+};
+
+MODULE_DEVICE_TABLE (pci, prosavage_pci_tbl);
+
+static struct pci_driver prosavage_driver = {
+	.name		=	"prosavage_smbus",
+	.id_table	=	prosavage_pci_tbl,
+	.probe		=	prosavage_probe,
+	.remove		=	prosavage_remove,
+};
+
+static int __init i2c_prosavage_init(void)
+{
+	return pci_register_driver(&prosavage_driver);
+}
+
+static void __exit i2c_prosavage_exit(void)
+{
+	pci_unregister_driver(&prosavage_driver);
+}
+
+MODULE_DEVICE_TABLE(pci, prosavage_pci_tbl);
+MODULE_AUTHOR("Henk Vergonet");
+MODULE_DESCRIPTION("ProSavage VIA 8365/8375 smbus driver");
+MODULE_LICENSE("GPL");
+
+module_init (i2c_prosavage_init);
+module_exit (i2c_prosavage_exit);