mfd: Add support for the RDC321x southbridge

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>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

3 files changed, 134 insertions, 1 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 3c6a9860dd9c..93d0e31c0438 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -409,6 +409,15 @@ config LPC_SCH
           LPC bridge function of the Intel SCH provides support for
           System Management Bus and General Purpose I/O.
 
+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"
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 87935f967aa0..f177e064b31b 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -63,4 +63,5 @@ obj-$(CONFIG_AB3100_OTP)	+= ab3100-otp.o
 obj-$(CONFIG_AB4500_CORE)       += ab4500-core.o
 obj-$(CONFIG_MFD_TIMBERDALE)    += timberdale.o
 obj-$(CONFIG_PMIC_ADP5520)      += adp5520.o
-obj-$(CONFIG_LPC_SCH)           += lpc_sch.o
\ No newline at end of file
+obj-$(CONFIG_LPC_SCH)           += lpc_sch.o
+obj-$(CONFIG_MFD_RDC321X)       += rdc321x-southbridge.o
diff --git a/drivers/mfd/rdc321x-southbridge.c b/drivers/mfd/rdc321x-southbridge.c
new file mode 100644
index 000000000000..256dd560bd48
--- /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_MEM,
+        }
+};
+
+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_MEM,
+        }, {
+                .name   = "gpio-reg2",
+                .start  = RDC321X_GPIO_CTRL_REG2,
+                .end    = RDC321X_GPIO_CTRL_REG2 + 0x7,
+                .flags  = IORESOURCE_MEM,
+        }
+};
+
+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");