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Date: Thu, 30 Sep 2010 21:55:41 +0100 (BST)
From: Daniel Drake <dsd@...top.org>
To: sameo@...ux.intel.com
Cc: laforge@...monks.org
Subject: [PATCH 2/3] Add VIA VX855 multi-function device support
This device has GPIO, SPI and I2C capabilities.
The hardware can be found in the OLPC XO-1.5 laptop.
Based on earlier work by Harald Welte.
Signed-off-by: Daniel Drake <dsd@...top.org>
---
drivers/mfd/Kconfig | 9 +++
drivers/mfd/Makefile | 1 +
drivers/mfd/vx855.c | 147 ++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 157 insertions(+), 0 deletions(-)
create mode 100644 drivers/mfd/vx855.c
Switched to the mfd cells design to allow the individual functions to be
registered as platform devices.
I've dropped the SPI driver from the submission.
It presented a headache with the resource system, the commit message in
the original version suggests that it might not be complete, and I have
no way of testing it. It could be cleanly added later if someone needs it
and can finish the work.
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 256fabd..9735f58 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -576,6 +576,15 @@ config MFD_TPS6586X
This driver can also be built as a module. If so, the module
will be called tps6586x.
+config MFD_VX855
+ tristate "Support for VIA VX855/VX875 integrated south bridge"
+ depends on PCI
+ select MFD_CORE
+ help
+ Say yes here to enable support for various functions of the
+ VIA VX855/VX875 south bridge. You will need to enable the vx855_spi
+ and/or vx855_gpio drivers for this to do anything useful.
+
endif # MFD_SUPPORT
menu "Multimedia Capabilities Port drivers"
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index d5968cd..d18a6ab 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -78,3 +78,4 @@ obj-$(CONFIG_MFD_RDC321X) += rdc321x-southbridge.o
obj-$(CONFIG_MFD_JANZ_CMODIO) += janz-cmodio.o
obj-$(CONFIG_MFD_JZ4740_ADC) += jz4740-adc.o
obj-$(CONFIG_MFD_TPS6586X) += tps6586x.o
+obj-$(CONFIG_MFD_VX855) += vx855.o
diff --git a/drivers/mfd/vx855.c b/drivers/mfd/vx855.c
new file mode 100644
index 0000000..ebb0597
--- /dev/null
+++ b/drivers/mfd/vx855.c
@@ -0,0 +1,147 @@
+/*
+ * Linux multi-function-device driver (MFD) for the integrated peripherals
+ * of the VIA VX855 chipset
+ *
+ * Copyright (C) 2009 VIA Technologies, Inc.
+ * Copyright (C) 2010 One Laptop per Child
+ * Author: Harald Welte <HaraldWelte@...tech.com>
+ * All rights reserved.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/pci.h>
+#include <linux/mfd/core.h>
+
+/* offset into pci config space indicating the 16bit register containing
+ * the power management IO space base */
+#define VX855_CFG_PMIO_OFFSET 0x88
+
+/* ACPI I/O Space registers */
+#define VX855_PMIO_ACPI 0x00
+#define VX855_PMIO_ACPI_LEN 0x0b
+
+/* Processor Power Management */
+#define VX855_PMIO_PPM 0x10
+#define VX855_PMIO_PPM_LEN 0x08
+
+/* General Purpose Power Management */
+#define VX855_PMIO_GPPM 0x20
+#define VX855_PMIO_R_GPI 0x48
+#define VX855_PMIO_R_GPO 0x4c
+#define VX855_PMIO_GPPM_LEN 0x33
+
+#define VSPIC_MMIO_SIZE 0x1000
+
+static struct resource vx855_gpio_resources[] = {
+ {
+ .flags = IORESOURCE_IO,
+ },
+ {
+ .flags = IORESOURCE_IO,
+ },
+};
+
+static struct mfd_cell vx855_cells[] = {
+ {
+ .name = "vx855_gpio",
+ .num_resources = ARRAY_SIZE(vx855_gpio_resources),
+ .resources = vx855_gpio_resources,
+
+ /* we must ignore resource conflicts, for reasons outlined in
+ * the vx855_gpio driver */
+ .ignore_resource_conflicts = true,
+ },
+};
+
+static __devinit int vx855_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ int ret;
+ u16 gpio_io_offset;
+
+ ret = pci_enable_device(pdev);
+ if (ret)
+ return -ENODEV;
+
+ pci_read_config_word(pdev, VX855_CFG_PMIO_OFFSET, &gpio_io_offset);
+ if (!gpio_io_offset) {
+ dev_warn(&pdev->dev,
+ "BIOS did not assign PMIO base offset?!?\n");
+ ret = -ENODEV;
+ goto out;
+ }
+
+ /* mask out the lowest seven bits, as they are always zero, but
+ * hardware returns them as 0x01 */
+ gpio_io_offset &= 0xff80;
+
+ /* As the region identified here includes many non-GPIO things, we
+ * only work with the specific registers that concern us. */
+ vx855_gpio_resources[0].start = gpio_io_offset + VX855_PMIO_R_GPI;
+ vx855_gpio_resources[0].end = vx855_gpio_resources[0].start + 3;
+ vx855_gpio_resources[1].start = gpio_io_offset + VX855_PMIO_R_GPO;
+ vx855_gpio_resources[1].end = vx855_gpio_resources[1].start + 3;
+
+ ret = mfd_add_devices(&pdev->dev, -1, vx855_cells, ARRAY_SIZE(vx855_cells),
+ NULL, 0);
+
+ /* we always return -ENODEV here in order to enable other
+ * drivers like old, not-yet-platform_device ported i2c-viapro */
+ return -ENODEV;
+out:
+ pci_disable_device(pdev);
+ return ret;
+}
+
+static void vx855_remove(struct pci_dev *pdev)
+{
+ mfd_remove_devices(&pdev->dev);
+ pci_disable_device(pdev);
+}
+
+static struct pci_device_id vx855_pci_tbl[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855) },
+ { 0, }
+};
+
+static struct pci_driver vx855_pci_driver = {
+ .name = "vx855",
+ .id_table = vx855_pci_tbl,
+ .probe = vx855_probe,
+ .remove = __devexit_p(vx855_remove),
+};
+
+static int vx855_init(void)
+{
+ return pci_register_driver(&vx855_pci_driver);
+}
+module_init(vx855_init);
+
+static void vx855_exit(void)
+{
+ pci_unregister_driver(&vx855_pci_driver);
+}
+module_exit(vx855_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Harald Welte <HaraldWelte@...tech.com>");
+MODULE_DESCRIPTION("Driver for the VIA VX855 chipset");
--
1.7.2.3
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