ChangeSet 1.1315.1.11, 2003/09/22 11:15:16-07:00, greg at kroah.com
[PATCH] I2C: add the i2c-voodoo3 i2c bus driver
This is based on the lmsensor cvs version of the driver, but is cleaned
it up and ported it to 2.6.
drivers/i2c/busses/Kconfig | 11 +
drivers/i2c/busses/Makefile | 1
drivers/i2c/busses/i2c-voodoo3.c | 248 +++++++++++++++++++++++++++++++++++++++
3 files changed, 260 insertions(+)
diff -Nru a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
--- a/drivers/i2c/busses/Kconfig Mon Sep 22 16:14:18 2003
+++ b/drivers/i2c/busses/Kconfig Mon Sep 22 16:14:18 2003
@@ -189,4 +189,15 @@
This driver can also be built as a module. If so, the module
will be called i2c-viapro.
+config I2C_VOODOO3
+ tristate "Voodoo 3"
+ depends on I2C && PCI && EXPERIMENTAL
+ help
+
+ If you say yes to this option, support will be included for the
+ Voodoo 3 I2C interface.
+
+ This driver can also be built as a module. If so, the module
+ will be called i2c-voodoo3.
+
endmenu
diff -Nru a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
--- a/drivers/i2c/busses/Makefile Mon Sep 22 16:14:18 2003
+++ b/drivers/i2c/busses/Makefile Mon Sep 22 16:14:18 2003
@@ -17,3 +17,4 @@
obj-$(CONFIG_I2C_SIS96X) += i2c-sis96x.o
obj-$(CONFIG_I2C_VIA) += i2c-via.o
obj-$(CONFIG_I2C_VIAPRO) += i2c-viapro.o
+obj-$(CONFIG_I2C_VOODOO3) += i2c-voodoo3.o
diff -Nru a/drivers/i2c/busses/i2c-voodoo3.c b/drivers/i2c/busses/i2c-voodoo3.c
--- /dev/null Wed Dec 31 16:00:00 1969
+++ b/drivers/i2c/busses/i2c-voodoo3.c Mon Sep 22 16:14:18 2003
@@ -0,0 +1,248 @@
+/*
+ voodoo3.c - Part of lm_sensors, Linux kernel modules for hardware
+ monitoring
+ Copyright (c) 1998, 1999 Frodo Looijaard <frodol at dds.nl>,
+ Philip Edelbrock <phil at netroedge.com>,
+ Ralph Metzler <rjkm at thp.uni-koeln.de>, and
+ Mark D. Studebaker <mdsxyz123 at yahoo.com>
+
+ Based on code written by Ralph Metzler <rjkm at 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>
+
+/* 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 *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 int 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,
+ .mdelay = CYCLE_DELAY,
+ .timeout = TIMEOUT
+};
+
+static struct i2c_adapter voodoo3_i2c_adapter = {
+ .owner = THIS_MODULE,
+ .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,
+ .mdelay = CYCLE_DELAY,
+ .timeout = TIMEOUT
+};
+
+static struct i2c_adapter voodoo3_ddc_adapter = {
+ .owner = THIS_MODULE,
+ .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, }
+};
+
+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_bit_del_bus(&voodoo3_i2c_adapter);
+ return retval;
+}
+
+static void __devexit voodoo3_remove(struct pci_dev *dev)
+{
+ i2c_bit_del_bus(&voodoo3_i2c_adapter);
+ i2c_bit_del_bus(&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_module_init(&voodoo3_driver);
+}
+
+static void __exit i2c_voodoo3_exit(void)
+{
+ pci_unregister_driver(&voodoo3_driver);
+}
+
+
+MODULE_AUTHOR("Frodo Looijaard <frodol at dds.nl>, "
+ "Philip Edelbrock <phil at netroedge.com>, "
+ "Ralph Metzler <rjkm at thp.uni-koeln.de>, "
+ "and Mark D. Studebaker <mdsxyz123 at yahoo.com>");
+MODULE_DESCRIPTION("Voodoo3 I2C/SMBus driver");
+MODULE_LICENSE("GPL");
+
+module_init(i2c_voodoo3_init);
+module_exit(i2c_voodoo3_exit);
