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// 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");
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