--- /dev/null
+/*
+ * matrox_w1.c
+ *
+ * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net>
+ *
+ *
+ * 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 <asm/types.h>
+#include <linux/atomic.h>
+#include <asm/io.h>
+
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/timer.h>
+#include <linux/slab.h>
+#include <linux/pci_ids.h>
+#include <linux/pci.h>
+
+#include "../w1.h"
+#include "../w1_int.h"
+#include "../w1_log.h"
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
+MODULE_DESCRIPTION("Driver for transport(Dallas 1-wire prtocol) over VGA DDC(matrox gpio).");
+
+static struct pci_device_id matrox_w1_tbl[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_MATROX, PCI_DEVICE_ID_MATROX_G400) },
+ { },
+};
+MODULE_DEVICE_TABLE(pci, matrox_w1_tbl);
+
+static int matrox_w1_probe(struct pci_dev *, const struct pci_device_id *);
+static void matrox_w1_remove(struct pci_dev *);
+
+static struct pci_driver matrox_w1_pci_driver = {
+ .name = "matrox_w1",
+ .id_table = matrox_w1_tbl,
+ .probe = matrox_w1_probe,
+ .remove = matrox_w1_remove,
+};
+
+/*
+ * Matrox G400 DDC registers.
+ */
+
+#define MATROX_G400_DDC_CLK (1<<4)
+#define MATROX_G400_DDC_DATA (1<<1)
+
+#define MATROX_BASE 0x3C00
+#define MATROX_STATUS 0x1e14
+
+#define MATROX_PORT_INDEX_OFFSET 0x00
+#define MATROX_PORT_DATA_OFFSET 0x0A
+
+#define MATROX_GET_CONTROL 0x2A
+#define MATROX_GET_DATA 0x2B
+#define MATROX_CURSOR_CTL 0x06
+
+struct matrox_device
+{
+ void __iomem *base_addr;
+ void __iomem *port_index;
+ void __iomem *port_data;
+ u8 data_mask;
+
+ unsigned long phys_addr;
+ void __iomem *virt_addr;
+ unsigned long found;
+
+ struct w1_bus_master *bus_master;
+};
+
+static u8 matrox_w1_read_ddc_bit(void *);
+static void matrox_w1_write_ddc_bit(void *, u8);
+
+/*
+ * These functions read and write DDC Data bit.
+ *
+ * Using tristate pins, since i can't find any open-drain pin in whole motherboard.
+ * Unfortunately we can't connect to Intel's 82801xx IO controller
+ * since we don't know motherboard schema, which has pretty unused(may be not) GPIO.
+ *
+ * I've heard that PIIX also has open drain pin.
+ *
+ * Port mapping.
+ */
+static __inline__ u8 matrox_w1_read_reg(struct matrox_device *dev, u8 reg)
+{
+ u8 ret;
+
+ writeb(reg, dev->port_index);
+ ret = readb(dev->port_data);
+ barrier();
+
+ return ret;
+}
+
+static __inline__ void matrox_w1_write_reg(struct matrox_device *dev, u8 reg, u8 val)
+{
+ writeb(reg, dev->port_index);
+ writeb(val, dev->port_data);
+ wmb();
+}
+
+static void matrox_w1_write_ddc_bit(void *data, u8 bit)
+{
+ u8 ret;
+ struct matrox_device *dev = data;
+
+ if (bit)
+ bit = 0;
+ else
+ bit = dev->data_mask;
+
+ ret = matrox_w1_read_reg(dev, MATROX_GET_CONTROL);
+ matrox_w1_write_reg(dev, MATROX_GET_CONTROL, ((ret & ~dev->data_mask) | bit));
+ matrox_w1_write_reg(dev, MATROX_GET_DATA, 0x00);
+}
+
+static u8 matrox_w1_read_ddc_bit(void *data)
+{
+ u8 ret;
+ struct matrox_device *dev = data;
+
+ ret = matrox_w1_read_reg(dev, MATROX_GET_DATA);
+
+ return ret;
+}
+
+static void matrox_w1_hw_init(struct matrox_device *dev)
+{
+ matrox_w1_write_reg(dev, MATROX_GET_DATA, 0xFF);
+ matrox_w1_write_reg(dev, MATROX_GET_CONTROL, 0x00);
+}
+
+static int matrox_w1_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+ struct matrox_device *dev;
+ int err;
+
+ assert(pdev != NULL);
+ assert(ent != NULL);
+
+ if (pdev->vendor != PCI_VENDOR_ID_MATROX || pdev->device != PCI_DEVICE_ID_MATROX_G400)
+ return -ENODEV;
+
+ dev = kzalloc(sizeof(struct matrox_device) +
+ sizeof(struct w1_bus_master), GFP_KERNEL);
+ if (!dev) {
+ dev_err(&pdev->dev,
+ "%s: Failed to create new matrox_device object.\n",
+ __func__);
+ return -ENOMEM;
+ }
+
+
+ dev->bus_master = (struct w1_bus_master *)(dev + 1);
+
+ /*
+ * True for G400, for some other we need resource 0, see drivers/video/matrox/matroxfb_base.c
+ */
+
+ dev->phys_addr = pci_resource_start(pdev, 1);
+
+ dev->virt_addr = ioremap_nocache(dev->phys_addr, 16384);
+ if (!dev->virt_addr) {
+ dev_err(&pdev->dev, "%s: failed to ioremap(0x%lx, %d).\n",
+ __func__, dev->phys_addr, 16384);
+ err = -EIO;
+ goto err_out_free_device;
+ }
+
+ dev->base_addr = dev->virt_addr + MATROX_BASE;
+ dev->port_index = dev->base_addr + MATROX_PORT_INDEX_OFFSET;
+ dev->port_data = dev->base_addr + MATROX_PORT_DATA_OFFSET;
+ dev->data_mask = (MATROX_G400_DDC_DATA);
+
+ matrox_w1_hw_init(dev);
+
+ dev->bus_master->data = dev;
+ dev->bus_master->read_bit = &matrox_w1_read_ddc_bit;
+ dev->bus_master->write_bit = &matrox_w1_write_ddc_bit;
+
+ err = w1_add_master_device(dev->bus_master);
+ if (err)
+ goto err_out_free_device;
+
+ pci_set_drvdata(pdev, dev);
+
+ dev->found = 1;
+
+ dev_info(&pdev->dev, "Matrox G400 GPIO transport layer for 1-wire.\n");
+
+ return 0;
+
+err_out_free_device:
+ if (dev->virt_addr)
+ iounmap(dev->virt_addr);
+ kfree(dev);
+
+ return err;
+}
+
+static void matrox_w1_remove(struct pci_dev *pdev)
+{
+ struct matrox_device *dev = pci_get_drvdata(pdev);
+
+ assert(dev != NULL);
+
+ if (dev->found) {
+ w1_remove_master_device(dev->bus_master);
+ iounmap(dev->virt_addr);
+ }
+ kfree(dev);
+}
+
+static int __init matrox_w1_init(void)
+{
+ return pci_register_driver(&matrox_w1_pci_driver);
+}
+
+static void __exit matrox_w1_fini(void)
+{
+ pci_unregister_driver(&matrox_w1_pci_driver);
+}
+
+module_init(matrox_w1_init);
+module_exit(matrox_w1_fini);
Code Review / kvmfornfv.git / blobdiff