This patch adds a new MFD driver for the RDC321x southbridge. This southbridge is always present in the RDC321x System-on-a-Chip and provides access to some GPIOs as well as a watchdog. Access to these two functions is done using the southbridge PCI device configuration space. Signed-off-by: Florian Fainelli --- Changes from v2: - pass the pci_dev pointer to MFD cell drivers as platform_data - remove the printk(KERN_ERR and use dev_err instead - removed pci_dev accessors - use DEFINE_PCI_DEVICE_TABLE --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -305,6 +305,15 @@ config EZX_PCAP This enables the PCAP ASIC present on EZX Phones. This is needed for MMC, TouchScreen, Sound, USB, etc.. +config MFD_RDC321X + tristate "Support for RDC-R321x southbridge" + select MFD_CORE + depends on PCI + help + Say yes here if you want to have support for the RDC R-321x SoC + southbridge which provides access to GPIOs and Watchdog using the + southbridge PCI device configuration space. + endmenu menu "Multimedia Capabilities Port drivers" --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -50,3 +50,5 @@ obj-$(CONFIG_PCF50633_ADC) += pcf50633-a obj-$(CONFIG_PCF50633_GPIO) += pcf50633-gpio.o obj-$(CONFIG_AB3100_CORE) += ab3100-core.o obj-$(CONFIG_AB3100_OTP) += ab3100-otp.o + +obj-$(CONFIG_MFD_RDC321X) += rdc321x-southbridge.o --- /dev/null +++ b/drivers/mfd/rdc321x-southbridge.c @@ -0,0 +1,123 @@ +/* + * RDC321x MFD southbrige driver + * + * Copyright (C) 2007-2010 Florian Fainelli + * Copyright (C) 2010 Bernhard Loos + * + * 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; either version 2 of the License, or + * (at your option) any later version. + * + * 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 +#include +#include +#include +#include +#include +#include + +static struct rdc321x_wdt_pdata rdc321x_wdt_pdata; + +static struct resource rdc321x_wdt_resource[] = { + { + .name = "wdt-reg", + .start = RDC321X_WDT_CTRL, + .end = RDC321X_WDT_CTRL + 0x3, + .flags = IORESOURCE_IO, + } +}; + +static struct rdc321x_gpio_pdata rdc321x_gpio_pdata = { + .max_gpios = RDC321X_MAX_GPIO, +}; + +static struct resource rdc321x_gpio_resources[] = { + { + .name = "gpio-reg1", + .start = RDC321X_GPIO_CTRL_REG1, + .end = RDC321X_GPIO_CTRL_REG1 + 0x7, + .flags = IORESOURCE_IO, + }, { + .name = "gpio-reg2", + .start = RDC321X_GPIO_CTRL_REG2, + .end = RDC321X_GPIO_CTRL_REG2 + 0x7, + .flags = IORESOURCE_IO, + } +}; + +static struct mfd_cell rdc321x_sb_cells[] = { + { + .name = "rdc321x-wdt", + .resources = rdc321x_wdt_resource, + .num_resources = ARRAY_SIZE(rdc321x_wdt_resource), + .driver_data = &rdc321x_wdt_pdata, + }, { + .name = "rdc321x-gpio", + .resources = rdc321x_gpio_resources, + .num_resources = ARRAY_SIZE(rdc321x_gpio_resources), + .driver_data = &rdc321x_gpio_pdata, + }, +}; + +static int __devinit rdc321x_sb_probe(struct pci_dev *pdev, + const struct pci_device_id *ent) +{ + int err; + + err = pci_enable_device(pdev); + if (err) { + dev_err(&pdev->dev, "failed to enable device\n"); + return err; + } + + rdc321x_gpio_pdata.sb_pdev = pdev; + rdc321x_wdt_pdata.sb_pdev = pdev; + + return mfd_add_devices(&pdev->dev, -1, + rdc321x_sb_cells, ARRAY_SIZE(rdc321x_sb_cells), NULL, 0); +} + +static void __devexit rdc321x_sb_remove(struct pci_dev *pdev) +{ + mfd_remove_devices(&pdev->dev); +} + +static DEFINE_PCI_DEVICE_TABLE(rdc321x_sb_table) = { + { PCI_DEVICE(PCI_VENDOR_ID_RDC, PCI_DEVICE_ID_RDC_R6030) }, + {} +}; + +static struct pci_driver rdc321x_sb_driver = { + .name = "RDC321x Southbridge", + .id_table = rdc321x_sb_table, + .probe = rdc321x_sb_probe, + .remove = __devexit_p(rdc321x_sb_remove), +}; + +static int __init rdc321x_sb_init(void) +{ + return pci_register_driver(&rdc321x_sb_driver); +} + +static void __exit rdc321x_sb_exit(void) +{ + pci_unregister_driver(&rdc321x_sb_driver); +} + +module_init(rdc321x_sb_init); +module_exit(rdc321x_sb_exit); + +MODULE_AUTHOR("Florian Fainelli "); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("RDC R-321x MFD southbridge driver"); --- /dev/null +++ b/include/linux/mfd/rdc321x.h @@ -0,0 +1,26 @@ +#ifndef __RDC321X_MFD_H +#define __RDC321X_MFD_H + +#include +#include + +/* Offsets to be accessed in the southbridge PCI + * device configuration register */ +#define RDC321X_WDT_CTRL 0x44 +#define RDC321X_GPIO_CTRL_REG1 0x48 +#define RDC321X_GPIO_DATA_REG1 0x4c +#define RDC321X_GPIO_CTRL_REG2 0x84 +#define RDC321X_GPIO_DATA_REG2 0x88 + +#define RDC321X_MAX_GPIO 58 + +struct rdc321x_gpio_pdata { + struct pci_dev *sb_pdev; + unsigned max_gpios; +}; + +struct rdc321x_wdt_pdata { + struct pci_dev *sb_pdev; +}; + +#endif /* __RDC321X_MFD_H */