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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 <florian@openwrt.org>
---
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 <florian@openwrt.org>
+ * Copyright (C) 2010 Bernhard Loos <bernhardloos@googlemail.com>
+ *
+ * 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 <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/pci.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/rdc321x.h>
+
+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 <florian@openwrt.org>");
+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 <linux/types.h>
+#include <linux/pci.h>
+
+/* 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 */
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