linux/drivers/mfd/lpc_sch.c
Thomas Gleixner 9f8068503d treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 294
Based on 2 normalized pattern(s):

  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

  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 this program is distributed in the hope
  that it [would] 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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 9 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190529141901.804956444@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:36:38 +02:00

209 lines
4.8 KiB
C

// 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 GPIOBASE 0x44
#define GPIO_IO_SIZE 64
#define GPIO_IO_SIZE_CENTERTON 128
/* Intel Quark X1000 GPIO IRQ Number */
#define GPIO_IRQ_QUARK_X1000 9
#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;
int irq_gpio;
};
static struct lpc_sch_info sch_chipset_info[] = {
[LPC_SCH] = {
.io_size_smbus = SMBUS_IO_SIZE,
.io_size_gpio = GPIO_IO_SIZE,
.irq_gpio = -1,
},
[LPC_ITC] = {
.io_size_smbus = SMBUS_IO_SIZE,
.io_size_gpio = GPIO_IO_SIZE,
.io_size_wdt = WDT_IO_SIZE,
.irq_gpio = -1,
},
[LPC_CENTERTON] = {
.io_size_smbus = SMBUS_IO_SIZE,
.io_size_gpio = GPIO_IO_SIZE_CENTERTON,
.io_size_wdt = WDT_IO_SIZE,
.irq_gpio = -1,
},
[LPC_QUARK_X1000] = {
.io_size_gpio = GPIO_IO_SIZE,
.irq_gpio = GPIO_IRQ_QUARK_X1000,
.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 irq,
int id, struct mfd_cell *cell)
{
struct resource *res;
int ret;
res = devm_kcalloc(&pdev->dev, 2, 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;
/* Check if we need to add an IRQ resource */
if (irq < 0)
return 0;
res++;
res->start = irq;
res->end = irq;
res->flags = IORESOURCE_IRQ;
cell->num_resources++;
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, -1,
id->device, &lpc_sch_cells[cells]);
if (ret < 0)
return ret;
if (ret == 0)
cells++;
ret = lpc_sch_populate_cell(dev, GPIOBASE, "sch_gpio",
info->io_size_gpio, info->irq_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, -1,
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");