/* * matrox_w1.c * * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru> * * * 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 <asm/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 <johnpol@2ka.mipt.ru>"); 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 __devinit matrox_w1_probe(struct pci_dev *, const struct pci_device_id *); static void __devexit 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 = __devexit_p(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 __devinit 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 __devexit 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);