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mfd: Add cs5535-mfd driver for AMD Geode's CS5535/CS5536 support

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Add an MFD driver to handle the ISA device on CS5535 and CS5536
southbridges. This ISA bridge is actually multiple devices: GPIOs,
MFGPTs, etc.

Signed-off-by: Andres Salomon <dilinger@queued.net>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Andres Salomon 2010-11-26 11:52:35 +01:00 committed by Samuel Ortiz
parent e1b88eb0e0
commit f71e1afdd5
3 changed files with 160 additions and 0 deletions
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8
drivers/mfd/Kconfig
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@ -537,6 +537,14 @@ config AB3550_CORE
LEDs, vibrator, system power and temperature, power management
and ALSA sound.
config MFD_CS5535
tristate "Support for CS5535 and CS5536 southbridge core functions"
select MFD_CORE
depends on PCI
---help---
This is the core driver for CS5535/CS5536 MFD functions. This is
necessary for using the board's GPIO and MFGPT functionality.
config MFD_TIMBERDALE
tristate "Support for the Timberdale FPGA"
select MFD_CORE

1
drivers/mfd/Makefile
View File

@ -82,3 +82,4 @@ obj-$(CONFIG_MFD_JZ4740_ADC) += jz4740-adc.o
obj-$(CONFIG_MFD_TPS6586X) += tps6586x.o
obj-$(CONFIG_MFD_VX855) += vx855.o
obj-$(CONFIG_MFD_WL1273_CORE) += wl1273-core.o
obj-$(CONFIG_MFD_CS5535) += cs5535-mfd.o

151
drivers/mfd/cs5535-mfd.c Normal file
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@ -0,0 +1,151 @@
/*
* 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>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/pci.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 __devinitdata struct resource cs5535_mfd_resources[NR_BARS];
static __devinitdata 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],
},
{
.id = ACPI_BAR,
.name = "cs5535-acpi",
.num_resources = 1,
.resources = &cs5535_mfd_resources[ACPI_BAR],
},
};
static int __devinit 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);
if (err) {
dev_err(&pdev->dev, "MFD add devices failed: %d\n", err);
goto err_disable;
}
dev_info(&pdev->dev, "%d devices registered.\n",
ARRAY_SIZE(cs5535_mfd_cells));
return 0;
err_disable:
pci_disable_device(pdev);
return err;
}
static void __devexit cs5535_mfd_remove(struct pci_dev *pdev)
{
mfd_remove_devices(&pdev->dev);
pci_disable_device(pdev);
}
static 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_drv = {
.name = DRV_NAME,
.id_table = cs5535_mfd_pci_tbl,
.probe = cs5535_mfd_probe,
.remove = __devexit_p(cs5535_mfd_remove),
};
static int __init cs5535_mfd_init(void)
{
return pci_register_driver(&cs5535_mfd_drv);
}
static void __exit cs5535_mfd_exit(void)
{
pci_unregister_driver(&cs5535_mfd_drv);
}
module_init(cs5535_mfd_init);
module_exit(cs5535_mfd_exit);
MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");
MODULE_LICENSE("GPL");