mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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f024fd0c2a
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@21232 3c298f89-4303-0410-b956-a3cf2f4a3e73
195 lines
5.4 KiB
Diff
195 lines
5.4 KiB
Diff
This patch adds a new MFD driver for the RDC321x southbridge. This southbridge
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is always present in the RDC321x System-on-a-Chip and provides access to some
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GPIOs as well as a watchdog. Access to these two functions is done using the
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southbridge PCI device configuration space.
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Signed-off-by: Florian Fainelli <florian@openwrt.org>
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---
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Changes from v2:
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- pass the pci_dev pointer to MFD cell drivers as platform_data
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- remove the printk(KERN_ERR and use dev_err instead
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- removed pci_dev accessors
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- use DEFINE_PCI_DEVICE_TABLE
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--- a/drivers/mfd/Kconfig
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+++ b/drivers/mfd/Kconfig
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@@ -305,6 +305,15 @@ config EZX_PCAP
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This enables the PCAP ASIC present on EZX Phones. This is
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needed for MMC, TouchScreen, Sound, USB, etc..
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+config MFD_RDC321X
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+ tristate "Support for RDC-R321x southbridge"
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+ select MFD_CORE
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+ depends on PCI
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+ help
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+ Say yes here if you want to have support for the RDC R-321x SoC
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+ southbridge which provides access to GPIOs and Watchdog using the
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+ southbridge PCI device configuration space.
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+
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endmenu
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menu "Multimedia Capabilities Port drivers"
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--- a/drivers/mfd/Makefile
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+++ b/drivers/mfd/Makefile
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@@ -50,3 +50,5 @@ obj-$(CONFIG_PCF50633_ADC) += pcf50633-a
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obj-$(CONFIG_PCF50633_GPIO) += pcf50633-gpio.o
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obj-$(CONFIG_AB3100_CORE) += ab3100-core.o
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obj-$(CONFIG_AB3100_OTP) += ab3100-otp.o
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+
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+obj-$(CONFIG_MFD_RDC321X) += rdc321x-southbridge.o
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--- /dev/null
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+++ b/drivers/mfd/rdc321x-southbridge.c
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@@ -0,0 +1,123 @@
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+/*
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+ * RDC321x MFD southbrige driver
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+ *
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+ * Copyright (C) 2007-2010 Florian Fainelli <florian@openwrt.org>
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+ * Copyright (C) 2010 Bernhard Loos <bernhardloos@googlemail.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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+ *
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+ */
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+#include <linux/init.h>
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+#include <linux/module.h>
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+#include <linux/kernel.h>
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+#include <linux/platform_device.h>
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+#include <linux/pci.h>
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+#include <linux/mfd/core.h>
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+#include <linux/mfd/rdc321x.h>
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+
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+static struct rdc321x_wdt_pdata rdc321x_wdt_pdata;
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+
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+static struct resource rdc321x_wdt_resource[] = {
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+ {
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+ .name = "wdt-reg",
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+ .start = RDC321X_WDT_CTRL,
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+ .end = RDC321X_WDT_CTRL + 0x3,
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+ .flags = IORESOURCE_MEM,
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+ }
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+};
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+
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+static struct rdc321x_gpio_pdata rdc321x_gpio_pdata = {
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+ .max_gpios = RDC321X_MAX_GPIO,
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+};
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+
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+static struct resource rdc321x_gpio_resources[] = {
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+ {
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+ .name = "gpio-reg1",
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+ .start = RDC321X_GPIO_CTRL_REG1,
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+ .end = RDC321X_GPIO_CTRL_REG1 + 0x7,
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+ .flags = IORESOURCE_MEM,
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+ }, {
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+ .name = "gpio-reg2",
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+ .start = RDC321X_GPIO_CTRL_REG2,
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+ .end = RDC321X_GPIO_CTRL_REG2 + 0x7,
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+ .flags = IORESOURCE_MEM,
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+ }
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+};
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+
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+static struct mfd_cell rdc321x_sb_cells[] = {
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+ {
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+ .name = "rdc321x-wdt",
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+ .resources = rdc321x_wdt_resource,
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+ .num_resources = ARRAY_SIZE(rdc321x_wdt_resource),
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+ .driver_data = &rdc321x_wdt_pdata,
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+ }, {
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+ .name = "rdc321x-gpio",
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+ .resources = rdc321x_gpio_resources,
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+ .num_resources = ARRAY_SIZE(rdc321x_gpio_resources),
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+ .driver_data = &rdc321x_gpio_pdata,
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+ },
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+};
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+
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+static int __devinit rdc321x_sb_probe(struct pci_dev *pdev,
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+ const struct pci_device_id *ent)
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+{
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+ int err;
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+
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+ err = pci_enable_device(pdev);
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+ if (err) {
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+ dev_err(&pdev->dev, "failed to enable device\n");
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+ return err;
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+ }
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+
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+ rdc321x_gpio_pdata.sb_pdev = pdev;
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+ rdc321x_wdt_pdata.sb_pdev = pdev;
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+
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+ return mfd_add_devices(&pdev->dev, -1,
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+ rdc321x_sb_cells, ARRAY_SIZE(rdc321x_sb_cells), NULL, 0);
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+}
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+
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+static void __devexit rdc321x_sb_remove(struct pci_dev *pdev)
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+{
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+ mfd_remove_devices(&pdev->dev);
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+}
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+
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+static DEFINE_PCI_DEVICE_TABLE(rdc321x_sb_table) = {
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+ { PCI_DEVICE(PCI_VENDOR_ID_RDC, PCI_DEVICE_ID_RDC_R6030) },
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+ {}
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+};
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+
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+static struct pci_driver rdc321x_sb_driver = {
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+ .name = "RDC321x Southbridge",
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+ .id_table = rdc321x_sb_table,
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+ .probe = rdc321x_sb_probe,
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+ .remove = __devexit_p(rdc321x_sb_remove),
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+};
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+
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+static int __init rdc321x_sb_init(void)
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+{
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+ return pci_register_driver(&rdc321x_sb_driver);
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+}
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+
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+static void __exit rdc321x_sb_exit(void)
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+{
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+ pci_unregister_driver(&rdc321x_sb_driver);
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+}
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+
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+module_init(rdc321x_sb_init);
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+module_exit(rdc321x_sb_exit);
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+
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+MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
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+MODULE_LICENSE("GPL");
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+MODULE_DESCRIPTION("RDC R-321x MFD southbridge driver");
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--- /dev/null
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+++ b/include/linux/mfd/rdc321x.h
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@@ -0,0 +1,26 @@
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+#ifndef __RDC321X_MFD_H
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+#define __RDC321X_MFD_H
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+
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+#include <linux/types.h>
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+#include <linux/pci.h>
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+
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+/* Offsets to be accessed in the southbridge PCI
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+ * device configuration register */
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+#define RDC321X_WDT_CTRL 0x44
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+#define RDC321X_GPIO_CTRL_REG1 0x48
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+#define RDC321X_GPIO_DATA_REG1 0x4c
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+#define RDC321X_GPIO_CTRL_REG2 0x84
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+#define RDC321X_GPIO_DATA_REG2 0x88
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+
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+#define RDC321X_MAX_GPIO 58
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+
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+struct rdc321x_gpio_pdata {
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+ struct pci_dev *sb_pdev;
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+ unsigned max_gpios;
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+};
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+
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+struct rdc321x_wdt_pdata {
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+ struct pci_dev *sb_pdev;
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+};
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+
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+#endif /* __RDC321X_MFD_H */
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