248 lines
5.9 KiB
C
248 lines
5.9 KiB
C
/*
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* matrox_w1.c
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*
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* Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
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*
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <asm/types.h>
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#include <linux/atomic.h>
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#include <asm/io.h>
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/timer.h>
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#include <linux/slab.h>
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#include <linux/pci_ids.h>
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#include <linux/pci.h>
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#include "../w1.h"
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#include "../w1_int.h"
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#include "../w1_log.h"
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
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MODULE_DESCRIPTION("Driver for transport(Dallas 1-wire prtocol) over VGA DDC(matrox gpio).");
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static struct pci_device_id matrox_w1_tbl[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_MATROX, PCI_DEVICE_ID_MATROX_G400) },
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{ },
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};
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MODULE_DEVICE_TABLE(pci, matrox_w1_tbl);
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static int __devinit matrox_w1_probe(struct pci_dev *, const struct pci_device_id *);
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static void __devexit matrox_w1_remove(struct pci_dev *);
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static struct pci_driver matrox_w1_pci_driver = {
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.name = "matrox_w1",
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.id_table = matrox_w1_tbl,
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.probe = matrox_w1_probe,
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.remove = __devexit_p(matrox_w1_remove),
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};
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/*
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* Matrox G400 DDC registers.
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*/
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#define MATROX_G400_DDC_CLK (1<<4)
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#define MATROX_G400_DDC_DATA (1<<1)
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#define MATROX_BASE 0x3C00
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#define MATROX_STATUS 0x1e14
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#define MATROX_PORT_INDEX_OFFSET 0x00
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#define MATROX_PORT_DATA_OFFSET 0x0A
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#define MATROX_GET_CONTROL 0x2A
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#define MATROX_GET_DATA 0x2B
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#define MATROX_CURSOR_CTL 0x06
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struct matrox_device
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{
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void __iomem *base_addr;
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void __iomem *port_index;
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void __iomem *port_data;
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u8 data_mask;
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unsigned long phys_addr;
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void __iomem *virt_addr;
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unsigned long found;
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struct w1_bus_master *bus_master;
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};
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static u8 matrox_w1_read_ddc_bit(void *);
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static void matrox_w1_write_ddc_bit(void *, u8);
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/*
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* These functions read and write DDC Data bit.
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*
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* Using tristate pins, since i can't find any open-drain pin in whole motherboard.
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* Unfortunately we can't connect to Intel's 82801xx IO controller
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* since we don't know motherboard schema, which has pretty unused(may be not) GPIO.
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*
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* I've heard that PIIX also has open drain pin.
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*
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* Port mapping.
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*/
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static __inline__ u8 matrox_w1_read_reg(struct matrox_device *dev, u8 reg)
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{
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u8 ret;
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writeb(reg, dev->port_index);
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ret = readb(dev->port_data);
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barrier();
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return ret;
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}
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static __inline__ void matrox_w1_write_reg(struct matrox_device *dev, u8 reg, u8 val)
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{
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writeb(reg, dev->port_index);
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writeb(val, dev->port_data);
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wmb();
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}
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static void matrox_w1_write_ddc_bit(void *data, u8 bit)
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{
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u8 ret;
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struct matrox_device *dev = data;
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if (bit)
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bit = 0;
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else
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bit = dev->data_mask;
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ret = matrox_w1_read_reg(dev, MATROX_GET_CONTROL);
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matrox_w1_write_reg(dev, MATROX_GET_CONTROL, ((ret & ~dev->data_mask) | bit));
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matrox_w1_write_reg(dev, MATROX_GET_DATA, 0x00);
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}
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static u8 matrox_w1_read_ddc_bit(void *data)
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{
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u8 ret;
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struct matrox_device *dev = data;
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ret = matrox_w1_read_reg(dev, MATROX_GET_DATA);
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return ret;
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}
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static void matrox_w1_hw_init(struct matrox_device *dev)
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{
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matrox_w1_write_reg(dev, MATROX_GET_DATA, 0xFF);
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matrox_w1_write_reg(dev, MATROX_GET_CONTROL, 0x00);
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}
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static int __devinit matrox_w1_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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{
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struct matrox_device *dev;
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int err;
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assert(pdev != NULL);
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assert(ent != NULL);
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if (pdev->vendor != PCI_VENDOR_ID_MATROX || pdev->device != PCI_DEVICE_ID_MATROX_G400)
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return -ENODEV;
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dev = kzalloc(sizeof(struct matrox_device) +
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sizeof(struct w1_bus_master), GFP_KERNEL);
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if (!dev) {
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dev_err(&pdev->dev,
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"%s: Failed to create new matrox_device object.\n",
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__func__);
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return -ENOMEM;
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}
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dev->bus_master = (struct w1_bus_master *)(dev + 1);
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/*
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* True for G400, for some other we need resource 0, see drivers/video/matrox/matroxfb_base.c
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*/
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dev->phys_addr = pci_resource_start(pdev, 1);
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dev->virt_addr = ioremap_nocache(dev->phys_addr, 16384);
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if (!dev->virt_addr) {
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dev_err(&pdev->dev, "%s: failed to ioremap(0x%lx, %d).\n",
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__func__, dev->phys_addr, 16384);
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err = -EIO;
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goto err_out_free_device;
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}
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dev->base_addr = dev->virt_addr + MATROX_BASE;
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dev->port_index = dev->base_addr + MATROX_PORT_INDEX_OFFSET;
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dev->port_data = dev->base_addr + MATROX_PORT_DATA_OFFSET;
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dev->data_mask = (MATROX_G400_DDC_DATA);
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matrox_w1_hw_init(dev);
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dev->bus_master->data = dev;
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dev->bus_master->read_bit = &matrox_w1_read_ddc_bit;
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dev->bus_master->write_bit = &matrox_w1_write_ddc_bit;
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err = w1_add_master_device(dev->bus_master);
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if (err)
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goto err_out_free_device;
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pci_set_drvdata(pdev, dev);
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dev->found = 1;
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dev_info(&pdev->dev, "Matrox G400 GPIO transport layer for 1-wire.\n");
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return 0;
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err_out_free_device:
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if (dev->virt_addr)
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iounmap(dev->virt_addr);
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kfree(dev);
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return err;
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}
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static void __devexit matrox_w1_remove(struct pci_dev *pdev)
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{
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struct matrox_device *dev = pci_get_drvdata(pdev);
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assert(dev != NULL);
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if (dev->found) {
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w1_remove_master_device(dev->bus_master);
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iounmap(dev->virt_addr);
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}
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kfree(dev);
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}
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static int __init matrox_w1_init(void)
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{
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return pci_register_driver(&matrox_w1_pci_driver);
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}
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static void __exit matrox_w1_fini(void)
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{
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pci_unregister_driver(&matrox_w1_pci_driver);
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}
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module_init(matrox_w1_init);
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module_exit(matrox_w1_fini);
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