3 files changed, 143 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 84a68d260772..9b25fe28233e 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -389,6 +389,15 @@ config MFD_TIMBERDALE
 
         The timberdale FPGA can be found on the Intel Atom development board
         for in-vehicle infontainment, called Russellville.
+
+config LPC_SCH
+        tristate "Intel SCH LPC"
+        depends on PCI
+        select MFD_CORE
+        help
+          LPC bridge function of the Intel SCH provides support for
+          System Management Bus and General Purpose I/O.
+
 endmenu
 
 menu "Multimedia Capabilities Port drivers"
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 878cac691067..22715add99a7 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -62,3 +62,4 @@ obj-$(CONFIG_AB3100_OTP)	+= ab3100-otp.o
 obj-$(CONFIG_AB4500_CORE)       += ab4500-core.o
 obj-$(CONFIG_MFD_TIMBERDALE)    += timberdale.o
 obj-$(CONFIG_PMIC_ADP5520)      += adp5520.o
+obj-$(CONFIG_LPC_SCH)           += lpc_sch.o
\ No newline at end of file
diff --git a/drivers/mfd/lpc_sch.c b/drivers/mfd/lpc_sch.c
new file mode 100644
index 000000000000..51b2f6065a0b
--- /dev/null
+++ b/drivers/mfd/lpc_sch.c
@@ -0,0 +1,133 @@
+/*
+ *  lpc_sch.c - LPC interface for Intel Poulsbo SCH
+ *
+ *  LPC bridge function of the Intel SCH contains many other
+ *  functional units, such as Interrupt controllers, Timers,
+ *  Power Management, System Management, GPIO, RTC, and LPC
+ *  Configuration Registers.
+ *
+ *  Copyright (c) 2010 CompuLab Ltd
+ *  Author: Denis Turischev <denis@compulab.co.il>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License 2 as published
+ *  by the Free Software Foundation.
+ *
+ *  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; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/acpi.h>
+#include <linux/pci.h>
+#include <linux/mfd/core.h>
+
+#define SMBASE          0x40
+#define SMBUS_IO_SIZE   64
+
+#define GPIOBASE        0x44
+#define GPIO_IO_SIZE    64
+
+static struct resource smbus_sch_resource = {
+                .flags = IORESOURCE_IO,
+};
+
+
+static struct resource gpio_sch_resource = {
+                .flags = IORESOURCE_IO,
+};
+
+static struct mfd_cell lpc_sch_cells[] = {
+        {
+                .name = "isch_smbus",
+                .num_resources = 1,
+                .resources = &smbus_sch_resource,
+        },
+        {
+                .name = "sch_gpio",
+                .num_resources = 1,
+                .resources = &gpio_sch_resource,
+        },
+};
+
+static struct pci_device_id lpc_sch_ids[] = {
+        { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) },
+        { 0, }
+};
+MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
+
+static int __devinit lpc_sch_probe(struct pci_dev *dev,
+                                const struct pci_device_id *id)
+{
+        unsigned int base_addr_cfg;
+        unsigned short base_addr;
+
+        pci_read_config_dword(dev, SMBASE, &base_addr_cfg);
+        if (!(base_addr_cfg & (1 << 31))) {
+                dev_err(&dev->dev, "Decode of the SMBus I/O range disabled\n");
+                return -ENODEV;
+        }
+        base_addr = (unsigned short)base_addr_cfg;
+        if (base_addr == 0) {
+                dev_err(&dev->dev, "I/O space for SMBus uninitialized\n");
+                return -ENODEV;
+        }
+
+        smbus_sch_resource.start = base_addr;
+        smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1;
+
+        pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg);
+        if (!(base_addr_cfg & (1 << 31))) {
+                dev_err(&dev->dev, "Decode of the GPIO I/O range disabled\n");
+                return -ENODEV;
+        }
+        base_addr = (unsigned short)base_addr_cfg;
+        if (base_addr == 0) {
+                dev_err(&dev->dev, "I/O space for GPIO uninitialized\n");
+                return -ENODEV;
+        }
+
+        gpio_sch_resource.start = base_addr;
+        gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1;
+
+        return mfd_add_devices(&dev->dev, -1,
+                        lpc_sch_cells, ARRAY_SIZE(lpc_sch_cells), NULL, 0);
+}
+
+static void __devexit lpc_sch_remove(struct pci_dev *dev)
+{
+        mfd_remove_devices(&dev->dev);
+}
+
+static struct pci_driver lpc_sch_driver = {
+        .name           = "lpc_sch",
+        .id_table       = lpc_sch_ids,
+        .probe          = lpc_sch_probe,
+        .remove         = __devexit_p(lpc_sch_remove),
+};
+
+static int __init lpc_sch_init(void)
+{
+        return pci_register_driver(&lpc_sch_driver);
+}
+
+static void __exit lpc_sch_exit(void)
+{
+        pci_unregister_driver(&lpc_sch_driver);
+}
+
+module_init(lpc_sch_init);
+module_exit(lpc_sch_exit);
+
+MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
+MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
+MODULE_LICENSE("GPL");