ChangeSet 1.1315.1.10, 2003/09/22 11:05:20-07:00, greg at kroah.com
[PATCH] I2C: add the i2c-savage4 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 | 10 +
drivers/i2c/busses/Makefile | 1
drivers/i2c/busses/i2c-savage4.c | 205 +++++++++++++++++++++++++++++++++++++++
3 files changed, 216 insertions(+)
diff -Nru a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
--- a/drivers/i2c/busses/Kconfig Mon Sep 22 16:14:28 2003
+++ b/drivers/i2c/busses/Kconfig Mon Sep 22 16:14:28 2003
@@ -113,6 +113,16 @@
This driver can also be built as a module. If so, the module
will be called i2c-piix4.
+config I2C_SAVAGE4
+ tristate "S3 Savage 4"
+ depends on I2C && PCI && EXPERIMENTAL
+ help
+ If you say yes to this option, support will be included for the
+ S3 Savage 4 I2C interface.
+
+ This driver can also be built as a module. If so, the module
+ will be called i2c-savage4.
+
config I2C_SIS5595
tristate "SiS 5595"
depends on I2C && PCI && EXPERIMENTAL
diff -Nru a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
--- a/drivers/i2c/busses/Makefile Mon Sep 22 16:14:28 2003
+++ b/drivers/i2c/busses/Makefile Mon Sep 22 16:14:28 2003
@@ -11,6 +11,7 @@
obj-$(CONFIG_I2C_ISA) += i2c-isa.o
obj-$(CONFIG_I2C_NFORCE2) += i2c-nforce2.o
obj-$(CONFIG_I2C_PIIX4) += i2c-piix4.o
+obj-$(CONFIG_I2C_SAVAGE4) += i2c-savage4.o
obj-$(CONFIG_I2C_SIS5595) += i2c-sis5595.o
obj-$(CONFIG_I2C_SIS630) += i2c-sis630.o
obj-$(CONFIG_I2C_SIS96X) += i2c-sis96x.o
diff -Nru a/drivers/i2c/busses/i2c-savage4.c b/drivers/i2c/busses/i2c-savage4.c
--- /dev/null Wed Dec 31 16:00:00 1969
+++ b/drivers/i2c/busses/i2c-savage4.c Mon Sep 22 16:14:28 2003
@@ -0,0 +1,205 @@
+/*
+ i2c-savage4.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 Savage4 to gain access to
+ the BT869 and possibly other I2C devices. The DDC bus is not
+ yet supported because its register is not memory-mapped.
+ However we leave the DDC code here, commented out, to make
+ it easier to add later.
+*/
+
+#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>
+
+/* 3DFX defines */
+#define PCI_CHIP_SAVAGE3D 0x8A20
+#define PCI_CHIP_SAVAGE3D_MV 0x8A21
+#define PCI_CHIP_SAVAGE4 0x8A22
+#define PCI_CHIP_SAVAGE2000 0x9102
+#define PCI_CHIP_PROSAVAGE_PM 0x8A25
+#define PCI_CHIP_PROSAVAGE_KM 0x8A26
+#define PCI_CHIP_SAVAGE_MX_MV 0x8c10
+#define PCI_CHIP_SAVAGE_MX 0x8c11
+#define PCI_CHIP_SAVAGE_IX_MV 0x8c12
+#define PCI_CHIP_SAVAGE_IX 0x8c13
+
+#define REG 0xff20 /* Serial Port 1 Register */
+
+/* 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 0x00000020
+#define I2C_SCL_OUT 0x00000001
+#define I2C_SDA_OUT 0x00000002
+#define I2C_SCL_IN 0x00000008
+#define I2C_SDA_IN 0x00000010
+
+/* initialization states */
+#define INIT2 0x20
+#define INIT3 0x04
+
+/* delays */
+#define CYCLE_DELAY 10
+#define TIMEOUT (HZ / 2)
+
+
+static void *ioaddr;
+
+/* The sav GPIO registers don't have individual masks for each bit
+ so we always have to read before writing. */
+
+static void bit_savi2c_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_savi2c_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_savi2c_getscl(void *data)
+{
+ return (0 != (readl(ioaddr + REG) & I2C_SCL_IN));
+}
+
+static int bit_savi2c_getsda(void *data)
+{
+ return (0 != (readl(ioaddr + REG) & I2C_SDA_IN));
+}
+
+/* Configures the chip */
+
+static int config_s4(struct pci_dev *dev)
+{
+ unsigned int cadr;
+
+ /* map memory */
+ cadr = dev->resource[0].start;
+ cadr &= PCI_BASE_ADDRESS_MEM_MASK;
+ ioaddr = ioremap_nocache(cadr, 0x0080000);
+ if (ioaddr) {
+ /* writel(0x8160, ioaddr + REG2); */
+ writel(0x00000020, ioaddr + REG);
+ dev_info(&dev->dev, "Using Savage4 at %p\n", ioaddr);
+ return 0;
+ }
+ return -ENODEV;
+}
+
+static struct i2c_algo_bit_data sav_i2c_bit_data = {
+ .setsda = bit_savi2c_setsda,
+ .setscl = bit_savi2c_setscl,
+ .getsda = bit_savi2c_getsda,
+ .getscl = bit_savi2c_getscl,
+ .udelay = CYCLE_DELAY,
+ .mdelay = CYCLE_DELAY,
+ .timeout = TIMEOUT
+};
+
+static struct i2c_adapter savage4_i2c_adapter = {
+ .owner = THIS_MODULE,
+ .name = "I2C Savage4 adapter",
+ .algo_data = &sav_i2c_bit_data,
+};
+
+static struct pci_device_id savage4_ids[] __devinitdata = {
+ { PCI_DEVICE(PCI_VENDOR_ID_S3, PCI_CHIP_SAVAGE4) },
+ { PCI_DEVICE(PCI_VENDOR_ID_S3, PCI_CHIP_SAVAGE2000) },
+ { 0, }
+};
+
+static int __devinit savage4_probe(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ int retval;
+
+ retval = config_s4(dev);
+ if (retval)
+ return retval;
+
+ /* set up the sysfs linkage to our parent device */
+ savage4_i2c_adapter.dev.parent = &dev->dev;
+
+ return i2c_bit_add_bus(&savage4_i2c_adapter);
+}
+
+static void __devexit savage4_remove(struct pci_dev *dev)
+{
+ i2c_bit_del_bus(&savage4_i2c_adapter);
+ iounmap(ioaddr);
+}
+
+static struct pci_driver savage4_driver = {
+ .name = "savage4 smbus",
+ .id_table = savage4_ids,
+ .probe = savage4_probe,
+ .remove = __devexit_p(savage4_remove),
+};
+
+static int __init i2c_savage4_init(void)
+{
+ return pci_module_init(&savage4_driver);
+}
+
+static void __exit i2c_savage4_exit(void)
+{
+ pci_unregister_driver(&savage4_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("Savage4 I2C/SMBus driver");
+MODULE_LICENSE("GPL");
+
+module_init(i2c_savage4_init);
+module_exit(i2c_savage4_exit);
