diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mfd/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/mfd/Makefile | 1 | ||||
| -rw-r--r-- | drivers/mfd/lpc_sch.c | 133 |
3 files changed, 143 insertions, 0 deletions
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 84a68d2..9b25fe2 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 878cac6..22715ad 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 0000000..51b2f60 --- /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"); |