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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 int cs5535_mfd_res_enable(struct platform_device *pdev)
{
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (!res) {
dev_err(&pdev->dev, "can't fetch device resource info\n");
return -EIO;
}
if (!request_region(res->start, resource_size(res), DRV_NAME)) {
dev_err(&pdev->dev, "can't request region\n");
return -EIO;
}
return 0;
}
static int cs5535_mfd_res_disable(struct platform_device *pdev)
{
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (!res) {
dev_err(&pdev->dev, "can't fetch device resource info\n");
return -EIO;
}
release_region(res->start, resource_size(res));
return 0;
}
static struct resource cs5535_mfd_resources[NR_BARS];
static struct mfd_cell cs5535_mfd_cells[] = {
{
.id = SMB_BAR,
.name = "cs5535-smb",
.num_resources = 1,
.resources = &cs5535_mfd_resources[SMB_BAR],
},
{
.id = GPIO_BAR,
.name = "cs5535-gpio",
.num_resources = 1,
.resources = &cs5535_mfd_resources[GPIO_BAR],
},
{
.id = MFGPT_BAR,
.name = "cs5535-mfgpt",
.num_resources = 1,
.resources = &cs5535_mfd_resources[MFGPT_BAR],
},
{
.id = PMS_BAR,
.name = "cs5535-pms",
.num_resources = 1,
.resources = &cs5535_mfd_resources[PMS_BAR],
.enable = cs5535_mfd_res_enable,
.disable = cs5535_mfd_res_disable,
},
{
.id = ACPI_BAR,
.name = "cs5535-acpi",
.num_resources = 1,
.resources = &cs5535_mfd_resources[ACPI_BAR],
.enable = cs5535_mfd_res_enable,
.disable = cs5535_mfd_res_disable,
},
};
static const char *olpc_acpi_clones[] = {
"olpc-xo1-pm-acpi",
"olpc-xo1-sci-acpi"
};
static int cs5535_mfd_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
int err, i;
err = pci_enable_device(pdev);
if (err)
return err;
/* fill in IO range for each cell; subdrivers handle the region */
for (i = 0; i < ARRAY_SIZE(cs5535_mfd_cells); i++) {
int bar = cs5535_mfd_cells[i].id;
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);
/* id is used for temporarily storing BAR; unset it now */
cs5535_mfd_cells[i].id = 0;
}
err = mfd_add_devices(&pdev->dev, -1, cs5535_mfd_cells,
ARRAY_SIZE(cs5535_mfd_cells), NULL, 0, NULL);
if (err) {
dev_err(&pdev->dev, "MFD add devices failed: %d\n", err);
goto err_disable;
}
if (machine_is_olpc())
mfd_clone_cell("cs5535-acpi", olpc_acpi_clones, ARRAY_SIZE(olpc_acpi_clones));
dev_info(&pdev->dev, "%zu devices registered.\n",
ARRAY_SIZE(cs5535_mfd_cells));
return 0;
err_disable:
pci_disable_device(pdev);
return err;
}
static void cs5535_mfd_remove(struct pci_dev *pdev)
{
mfd_remove_devices(&pdev->dev);
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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