diff options
Diffstat (limited to 'drivers/mfd/lpc_sch.c')
| -rw-r--r-- | drivers/mfd/lpc_sch.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/drivers/mfd/lpc_sch.c b/drivers/mfd/lpc_sch.c new file mode 100644 index 000000000..9ab9adce0 --- /dev/null +++ b/drivers/mfd/lpc_sch.c @@ -0,0 +1,188 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 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 + * Copyright (c) 2014 Intel Corp. + * Author: Denis Turischev <denis@compulab.co.il> + */ + +#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 GPIO_BASE 0x44 +#define GPIO_IO_SIZE 64 +#define GPIO_IO_SIZE_CENTERTON 128 + +#define WDTBASE 0x84 +#define WDT_IO_SIZE 64 + +enum sch_chipsets { + LPC_SCH = 0, /* Intel Poulsbo SCH */ + LPC_ITC, /* Intel Tunnel Creek */ + LPC_CENTERTON, /* Intel Centerton */ + LPC_QUARK_X1000, /* Intel Quark X1000 */ +}; + +struct lpc_sch_info { + unsigned int io_size_smbus; + unsigned int io_size_gpio; + unsigned int io_size_wdt; +}; + +static struct lpc_sch_info sch_chipset_info[] = { + [LPC_SCH] = { + .io_size_smbus = SMBUS_IO_SIZE, + .io_size_gpio = GPIO_IO_SIZE, + }, + [LPC_ITC] = { + .io_size_smbus = SMBUS_IO_SIZE, + .io_size_gpio = GPIO_IO_SIZE, + .io_size_wdt = WDT_IO_SIZE, + }, + [LPC_CENTERTON] = { + .io_size_smbus = SMBUS_IO_SIZE, + .io_size_gpio = GPIO_IO_SIZE_CENTERTON, + .io_size_wdt = WDT_IO_SIZE, + }, + [LPC_QUARK_X1000] = { + .io_size_gpio = GPIO_IO_SIZE, + .io_size_wdt = WDT_IO_SIZE, + }, +}; + +static const struct pci_device_id lpc_sch_ids[] = { + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC), LPC_SCH }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC), LPC_ITC }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_CENTERTON_ILB), LPC_CENTERTON }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_QUARK_X1000_ILB), LPC_QUARK_X1000 }, + { 0, } +}; +MODULE_DEVICE_TABLE(pci, lpc_sch_ids); + +#define LPC_NO_RESOURCE 1 +#define LPC_SKIP_RESOURCE 2 + +static int lpc_sch_get_io(struct pci_dev *pdev, int where, const char *name, + struct resource *res, int size) +{ + unsigned int base_addr_cfg; + unsigned short base_addr; + + if (size == 0) + return LPC_NO_RESOURCE; + + pci_read_config_dword(pdev, where, &base_addr_cfg); + base_addr = 0; + if (!(base_addr_cfg & (1 << 31))) + dev_warn(&pdev->dev, "Decode of the %s I/O range disabled\n", + name); + else + base_addr = (unsigned short)base_addr_cfg; + + if (base_addr == 0) { + dev_warn(&pdev->dev, "I/O space for %s uninitialized\n", name); + return LPC_SKIP_RESOURCE; + } + + res->start = base_addr; + res->end = base_addr + size - 1; + res->flags = IORESOURCE_IO; + + return 0; +} + +static int lpc_sch_populate_cell(struct pci_dev *pdev, int where, + const char *name, int size, int id, + struct mfd_cell *cell) +{ + struct resource *res; + int ret; + + res = devm_kzalloc(&pdev->dev, sizeof(*res), GFP_KERNEL); + if (!res) + return -ENOMEM; + + ret = lpc_sch_get_io(pdev, where, name, res, size); + if (ret) + return ret; + + memset(cell, 0, sizeof(*cell)); + + cell->name = name; + cell->resources = res; + cell->num_resources = 1; + cell->ignore_resource_conflicts = true; + cell->id = id; + + return 0; +} + +static int lpc_sch_probe(struct pci_dev *dev, const struct pci_device_id *id) +{ + struct mfd_cell lpc_sch_cells[3]; + struct lpc_sch_info *info = &sch_chipset_info[id->driver_data]; + unsigned int cells = 0; + int ret; + + ret = lpc_sch_populate_cell(dev, SMBASE, "isch_smbus", + info->io_size_smbus, + id->device, &lpc_sch_cells[cells]); + if (ret < 0) + return ret; + if (ret == 0) + cells++; + + ret = lpc_sch_populate_cell(dev, GPIO_BASE, "sch_gpio", + info->io_size_gpio, + id->device, &lpc_sch_cells[cells]); + if (ret < 0) + return ret; + if (ret == 0) + cells++; + + ret = lpc_sch_populate_cell(dev, WDTBASE, "ie6xx_wdt", + info->io_size_wdt, + id->device, &lpc_sch_cells[cells]); + if (ret < 0) + return ret; + if (ret == 0) + cells++; + + if (cells == 0) { + dev_err(&dev->dev, "All decode registers disabled.\n"); + return -ENODEV; + } + + return mfd_add_devices(&dev->dev, 0, lpc_sch_cells, cells, NULL, 0, NULL); +} + +static void 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 = lpc_sch_remove, +}; + +module_pci_driver(lpc_sch_driver); + +MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>"); +MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH"); +MODULE_LICENSE("GPL"); |