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// SPDX-License-Identifier: GPL-2.0-only
/*
* cs5535-mfd.c - core MFD driver for CS5535/CS5536 southbridges
*
* The CS5535 and CS5536 has an ISA bridge on the PCI bus that is
* used for accessing GPIOs, MFGPTs, ACPI, etc. Each subdevice has
* an IO range that's specified in a single BAR. The BAR order is
* hardcoded in the CS553x specifications.
*
* Copyright (c) 2010 Andres Salomon <dilinger@queued.net>
*/
#include <linux/kernel.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <asm/olpc.h>
#define DRV_NAME "cs5535-mfd"
enum cs5535_mfd_bars {
SMB_BAR = 0,
GPIO_BAR = 1,
MFGPT_BAR = 2,
PMS_BAR = 4,
ACPI_BAR = 5,
NR_BARS,
};
static struct resource cs5535_mfd_resources[NR_BARS];
static struct mfd_cell cs5535_mfd_cells[] = {
{
.name = "cs5535-smb",
.num_resources = 1,
.resources = &cs5535_mfd_resources[SMB_BAR],
},
{
.name = "cs5535-gpio",
.num_resources = 1,
.resources = &cs5535_mfd_resources[GPIO_BAR],
},
{
.name = "cs5535-mfgpt",
.num_resources = 1,
.resources = &cs5535_mfd_resources[MFGPT_BAR],
},
{
.name = "cs5535-pms",
.num_resources = 1,
.resources = &cs5535_mfd_resources[PMS_BAR],
},
};
static struct mfd_cell cs5535_olpc_mfd_cells[] = {
{
.name = "olpc-xo1-pm-acpi",
.num_resources = 1,
.resources = &cs5535_mfd_resources[ACPI_BAR],
},
{
.name = "olpc-xo1-sci-acpi",
.num_resources = 1,
.resources = &cs5535_mfd_resources[ACPI_BAR],
},
};
static int cs5535_mfd_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
int err, bar;
err = pci_enable_device(pdev);
if (err)
return err;
for (bar = 0; bar < NR_BARS; bar++) {
struct resource *r = &cs5535_mfd_resources[bar];
r->flags = IORESOURCE_IO;
r->start = pci_resource_start(pdev, bar);
r->end = pci_resource_end(pdev, bar);
}
err = pci_request_region(pdev, PMS_BAR, DRV_NAME);
if (err) {
dev_err(&pdev->dev, "Failed to request PMS_BAR's IO region\n");
goto err_disable;
}
err = mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE, cs5535_mfd_cells,
ARRAY_SIZE(cs5535_mfd_cells), NULL, 0, NULL);
if (err) {
dev_err(&pdev->dev,
"Failed to add CS5535 sub-devices: %d\n", err);
goto err_release_pms;
}
if (machine_is_olpc()) {
err = pci_request_region(pdev, ACPI_BAR, DRV_NAME);
if (err) {
dev_err(&pdev->dev,
"Failed to request ACPI_BAR's IO region\n");
goto err_remove_devices;
}
err = mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
cs5535_olpc_mfd_cells,
ARRAY_SIZE(cs5535_olpc_mfd_cells),
NULL, 0, NULL);
if (err) {
dev_err(&pdev->dev,
"Failed to add CS5535 OLPC sub-devices: %d\n",
err);
goto err_release_acpi;
}
}
dev_info(&pdev->dev, "%zu devices registered.\n",
ARRAY_SIZE(cs5535_mfd_cells));
return 0;
err_release_acpi:
pci_release_region(pdev, ACPI_BAR);
err_remove_devices:
mfd_remove_devices(&pdev->dev);
err_release_pms:
pci_release_region(pdev, PMS_BAR);
err_disable:
pci_disable_device(pdev);
return err;
}
static void cs5535_mfd_remove(struct pci_dev *pdev)
{
mfd_remove_devices(&pdev->dev);
if (machine_is_olpc())
pci_release_region(pdev, ACPI_BAR);
pci_release_region(pdev, PMS_BAR);
pci_disable_device(pdev);
}
static const struct pci_device_id cs5535_mfd_pci_tbl[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
{ 0, }
};
MODULE_DEVICE_TABLE(pci, cs5535_mfd_pci_tbl);
static struct pci_driver cs5535_mfd_driver = {
.name = DRV_NAME,
.id_table = cs5535_mfd_pci_tbl,
.probe = cs5535_mfd_probe,
.remove = cs5535_mfd_remove,
};
module_pci_driver(cs5535_mfd_driver);
MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");
MODULE_LICENSE("GPL");
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